CN210208108U - Double-layer laying pipe - Google Patents
Double-layer laying pipe Download PDFInfo
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- CN210208108U CN210208108U CN201921049099.9U CN201921049099U CN210208108U CN 210208108 U CN210208108 U CN 210208108U CN 201921049099 U CN201921049099 U CN 201921049099U CN 210208108 U CN210208108 U CN 210208108U
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Abstract
The utility model discloses a double-layer spinning pipe, which comprises an outer pipe, an inner pipe and a pipe head, wherein the inner pipe is lined in the outer pipe, and the inner pipe is in frictional contact with the outer pipe to restrict the movement relative to the outer pipe; the tube head main body is of a hollow tubular structure, the inner diameter of the tube head is not larger than that of the inner tube, the output end of the tube head is coaxially and fixedly connected with a connecting tube, and the connecting tube and the tube head have the same inner diameter and the outer diameter is smaller than that of the inner tube; the input end of the inner pipe is coaxially and fixedly connected with a tubular connecting part, the connecting part is as long as the connecting pipe, and the connecting part and the inner pipe have the same outer diameter and the same inner diameter and are in clearance fit with the connecting pipe; the tube head is fixedly connected with the input end of the outer tube, and the connecting tube is arranged in the connecting part in a penetrating mode. The utility model discloses a double-deck laying pipe utilizes the principle of slip inner tube to solve the local friction and wear that laying pipe and hot rolling product frictional contact arouse.
Description
Technical Field
The utility model relates to a laying pipe technical field, in particular to double-deck laying pipe.
Background
The laying head is a key device on the production line of a high-speed wire rod finishing mill and is positioned between a water cooling section of a rear controlled cooling line of the finishing mill and a lap-unwinding conveyor. The wire rod is changed into linear motion into spiral motion under the comprehensive action of driving force, relative inertia force, friction force, positive pressure and the like caused by the pinch roller and the spinning machine, and forms a stable coil with the diameter of about phi 1080mm and is discharged from the spinning pipe.
For many years, it has been generally accepted in the industry that: by radially confining the hot rolled product to a small space, it is possible to roll at a high speed. Patent document CN100333848C discloses a laying pipe comprising an outer pipe comprising a first rectilinear portion, a second spiral portion and a third circular portion, an inner pipe inserted inside the outer pipe, the outer diameter of the inner pipe being substantially equal to the inner diameter of the outer pipe, the length of the inner pipe being slightly longer than the length of the first rectilinear portion, and the inner pipe and the outer pipe being fixed to each other by welding at the inlet end of the rolled product.
The inner tube reduces the bore size of the laying pipe, radially confines the hot rolled product to a smaller space, improves guidance and makes the loop output to the cooling conveyor more consistent, enabling rolling at higher speeds; these advantages have however been largely offset by the greatly accelerated tube wear. Wear of the pipe not only affects the overall dynamic balance of the laying head, increasing vibration, but also causes the ability of the laying pipe to continually degrade in delivering a stable loop to the conveyor that interferes with cooling uniformity and also contributes to laying head windup accidents at the reforming station.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double-deck laying pipe, it utilizes the principle of slip inner tube to solve the laying pipe and the hot rolling product friction contact local friction and wear that arouses.
The above object of the present invention can be achieved by the following technical solutions:
a double-layer laying pipe comprising an outer pipe, an inner pipe lining the outer pipe, the inner pipe being constrained from movement relative to the outer pipe by frictional contact with the outer pipe, and a nipple; the tube head main body is of a hollow tubular structure, the inner diameter of the tube head is not larger than that of the inner tube, the output end of the tube head is coaxially and fixedly connected with a connecting tube, and the connecting tube and the tube head have the same inner diameter and the outer diameter is smaller than that of the inner tube; the input end of the inner pipe is coaxially and fixedly connected with a tubular connecting part, the connecting part is as long as the connecting pipe, and the connecting part and the inner pipe have the same outer diameter and the same inner diameter and are in clearance fit with the connecting pipe; the tube head is fixedly connected with the input end of the outer tube, and the connecting tube is arranged in the connecting part in a penetrating mode.
By adopting the above technical solution, when the laying pipe is subjected to heating and cooling cycles, the inner pipe will be progressively displaced in one direction towards the output end of the outer pipe, which progressive displacement will change the inner surface of the inner pipe in frictional contact with the hot rolled product and thus renew the inner surface of the inner pipe in frictional contact with the hot rolled product, thereby avoiding permanent frictional contact of the wire rod at any given area, so that, under the same amount of steel passing, the inner surface wear depth of the inner pipe is reduced to about 15% of the previous one, thereby preventing abnormal pipe replacement phenomena such as deep groove tangling and the like. The overlapping part of the connecting pipe and the connecting part can make up the clearance generated between the inner pipe and the pipe head due to the displacement of the inner pipe, and ensure that the hot rolled product is smoothly guided into the inner pipe.
The utility model discloses further set up to: the output end of the tube head is coaxially provided with a limiting ring, and the outer diameter of the limiting ring is the same as that of the tube head; the inner diameter of the limiting ring is larger than the outer diameter of the connecting pipe.
The utility model discloses further set up to: the thickness of spacing ring is 10 mm.
Through adopting above-mentioned technical scheme, form the interval between spacing ring and the connecting pipe, the tip of connecting portion is arranged in this interval to improve tube head and inner tube complex stability.
The utility model discloses further set up to: the input end of the tube head is provided with a taper hole-shaped leading-in part.
The utility model discloses further set up to: the included angle between the inner wall of the leading-in part and the inner wall of the pipe head is 13 degrees.
By adopting the technical scheme, the tube head can guide the hot rolled product more smoothly, and the hot rolled product can penetrate into the laying pipe through the tube head conveniently.
The utility model discloses further set up to: the inner pipe and the outer pipe are in transition fit, the maximum clearance is 0.2mm, and the maximum interference is 0.05 mm.
The utility model discloses further set up to: the axial dimension of the inner tube is smaller than the axial dimension of the outer tube.
The utility model discloses further set up to: the inner pipe and the outer pipe are equal in length.
To sum up, the utility model discloses following beneficial effect has:
1. by lining the outer pipe with an inner pipe, constrained in movement relative to the outer pipe only by frictional contact with the outer pipe, the inner pipe is able to move progressively within the outer pipe in response to heating and cooling cycles during rotation of the laying pipe about its axis, the progressive movement serving to periodically shift and thus renew the inner pipe surface in frictional contact with the hot rolled product, avoiding permanent frictional contact in any region of the inner wall of the inner pipe;
2. through set up the connecting pipe on the tube head, the connecting pipe on the one hand is convenient to cooperate with the laying pipe, and on the other hand overlaps with the inner tube axial, has compensated the axial forward distance of inner tube towards the conveying end.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
fig. 2A to 2C are schematic depictions showing the forces acting on the inner tube during the heating and cooling cycles.
In the figure, 1, an outer tube; 2. an inner tube; 21. a connecting portion; 3. a pipe head; 31. an introduction section; 32. a connecting pipe; 33. a limit ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b): a double-layer laying pipe comprises an outer pipe 1 and an inner pipe 2, wherein the outer pipe 1 is sequentially provided with a linear leading-in section, a bending deformation section and a stable section from an input end to an output end, and the linear leading-in section, the bending deformation section and the stable section are integrally formed. The inner pipe 2 is lined in the outer pipe 1 from the linear leading-in section, the inner pipe and the outer pipe are in transition fit, the maximum gap is 0.2mm, the maximum interference is 0.05mm, and the inner pipe 2 only restricts the movement relative to the outer pipe 1 through the frictional contact with the outer pipe 1; the inner pipe 2 and the outer pipe 1 constitute a double-layer laying pipe body.
The input end of the double-layer spinning pipe is connected with a pipe head 3, the main body of the pipe head 3 is of a hollow tubular structure, the inner wall of the input end of the pipe head 3 is chamfered, so that a tapered-hole-shaped leading-in part 31 is formed at the input end of the pipe head 3, the wall thickness of the leading-in part 31 gradually increases from small to large, and finally the leading-in part and the inner wall of the pipe head 3 are in smooth transition; the angle between the inner wall of the introduction portion 31 and the inner wall of the ferrule 3 is 13 °.
The inner diameter of the tube head 3 is smaller than or equal to the inner diameter of the inner tube 2, the output end of the tube head 3 is coaxially and fixedly connected with a connecting tube 32, the inner diameter of the connecting tube 32 is the same as the inner diameter of the tube head 3, and the outer diameter is smaller than the outer diameter of the inner tube 2; the input end of the inner tube 2 is coaxially and fixedly connected with a tubular connecting part 21, the connecting part 21 has the same length as the connecting tube 32, the outer diameter of the connecting part is the same as the outer diameter of the inner tube 2, and the inner diameter of the connecting part is in clearance fit with the outer diameter of the connecting tube 32; the connecting portion 21 is integrally formed with the inner tube 2. In this embodiment, the length of the connection tube 32 is 300 mm.
The output end of the tube head 3 is also coaxially provided with a limiting ring 33, the outer diameter of the limiting ring 33 is the same as that of the tube head 3, and the limiting ring and the tube head are in smooth transition; the inner diameter of the limiting ring 33 is larger than the outer diameter of the connecting pipe 32, so that a space is reserved between the limiting ring and the connecting pipe, and the space is not smaller than the wall thickness of the connecting part 21; the thickness of the stop collar 33 is 10 mm. The connection tube 32 and the retainer ring 33 may be integrally formed with the ferrule 3.
When the double-layer laying pipe is matched with the pipe head 3, the connecting pipe 32 of the pipe head 3 is inserted into the connecting part 21, after the double-layer laying pipe and the pipe head 3 are matched, the input end of the connecting part 21 extends into the interval between the connecting pipe 32 and the limiting ring 33, the input end of the outer pipe 1 abuts against the side wall of the limiting ring 33, and finally, the joint between the outer pipe 1 and the limiting ring 33 is welded, so that the pipe head 3 is installed on the laying pipe.
When the laying pipe is in use, it can rotate about the axis of the laying pipe, the hot rolled product passes through the laying pipe, the linear motion in the laying pipe is changed into a spiral motion, and the formed stable coil is discharged from the laying pipe. In the above process, the inner pipe 2 is heated due to contact with the hot rolled product. Typically, the hot rolled product will be at a temperature of about 900 ℃ to 1100 ℃, which will result in heating the inner tube 2 to a temperature of about 400 ℃. The outer tube 1 generally has a lower temperature due to its exposure to the surrounding environment.
In addition, when the hot rolled product passes through the inner pipe 2, it is rubbed against the inner pipe 2, and the axial force of the hot rolled product exerts a driving force F on the inner pipe 2D。
As shown in FIG. 2A, since the inner pipe 2 is heated by being brought into contact with the hot rolled product, the inner pipe 2 will undergo expansion so as to follow toward the inlet end(arrow F)EE) And an output (arrow F)DE) In opposite directions, applies a force. Expansion force FEEAnd FDESufficient to overcome frictional resistance FF. Expansion force FEEBy expansive force FDEWith a driving force FDThe resultant force of (a) is overcome, causing the inner tube 2 to progressively displace within the outer tube 1 towards the output end of the outer tube 1.
As shown in fig. 2B, when the temperature of the inner pipe 2 is stabilized, there is no expansion force or contraction force. Frictional force FFAgainst driving force FDSo that the inner tube 2 remains fixed within the outer tube 1.
As shown in fig. 2C, when the inner tube 2 cools, the inner tube 2 will undergo contraction, again towards the inlet end (arrow C)EE) And an output (arrow C)DE) Two opposing forces are applied. Force CEEAnd CDEEnough to overcome the friction force FF. Force of contraction CEEBy a contraction force CDEWith a driving force FDThereby causing the inlet end of the inner tube 2 to be progressively displaced within the outer tube 1 towards the outlet end of the outer tube 1.
Thus, it will be appreciated that as the laying pipe undergoes heating and cooling cycles, the inner pipe 2 will progressively displace in one direction towards the output end of the outer pipe 1, which progressive displacement will change the inner surface of the inner pipe 2 in frictional contact with the hot rolled product and thus renew the inner surface of the inner pipe 2 in frictional contact with the hot rolled product, avoiding permanent frictional contact of any region of the inner wall of the inner pipe 2. The connecting tube 32 of the pipe head 3 overlaps the connecting portion 21 by an amount sufficient to compensate for a gap generated between the inner tube 2 and the pipe head 3 when the inner tube 2 is displaced, thereby ensuring smooth guiding of the hot rolled product into the inner tube 2.
The inner tube 2 may be a tube with an axial dimension smaller than that of the outer tube 1, preferably 500mm and 1500mm, so that the friction between the inner tube 2 and the outer tube 1 is small, and the inner tube 2 can move gradually through the above process. The inner pipe 2 can also be selected as an integral embedded pipe, namely, the inner pipe 2 is as long as the outer pipe 1. The friction force between the inner pipe 2 and the outer pipe 1 of the integral pipe-inlaid spinning pipe far exceeds the driving force brought by the wire rods. But the part of the inner tube 2 located in the bending deformation zone will be subjected to rotation about the laying head axis due to its rotationTo centrifugal force which can be resolved into a force F perpendicular to the laying pipe guide pathN1And a force F applied toward the output end of the laying pipeN2. The inner tube 2 being heated or cooled by a force FN2And a driving force FDThe inner pipe 2 is made to slide gradually in the outer pipe 1 against the expansion force or contraction force in the opposite direction. In conclusion, the two types of double-layer laying pipes can solve the problem of local excessive wear of the inner wall of the laying pipe.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (8)
1. A double-layer laying pipe comprising an outer pipe (1), characterized in that: the pipe joint is characterized by further comprising an inner pipe (2) and a pipe head (3), wherein the inner pipe (2) is lined in the outer pipe (1), and the inner pipe (2) is in frictional contact with the outer pipe (1) to restrict movement relative to the outer pipe (1);
the main body of the tube head (3) is of a hollow tubular structure, the inner diameter of the tube head (3) is not larger than that of the inner tube (2), the output end of the tube head (3) is coaxially and fixedly connected with a connecting tube (32), and the connecting tube (32) and the tube head (3) have the same inner diameter and the same outer diameter which is smaller than that of the inner tube (2);
the input end of the inner tube (2) is coaxially and fixedly connected with a tubular connecting part (21), the connecting part (21) is as long as the connecting tube (32), and the connecting part (21) and the inner tube (2) have the same outer diameter and inner diameter and are in clearance fit with the connecting tube (32);
the tube head (3) is fixedly connected with the input end of the outer tube (1), and the connecting tube (32) is arranged in the connecting part (21) in a penetrating mode.
2. The dual-layer laying pipe of claim 1 wherein: the output end of the tube head (3) is coaxially provided with a limiting ring (33), and the outer diameter of the limiting ring (33) is the same as that of the tube head (3); the inner diameter of the limiting ring (33) is larger than the outer diameter of the connecting pipe (32).
3. The dual-layer laying pipe of claim 2 wherein: the thickness of the limiting ring (33) is 10 mm.
4. The dual-layer laying pipe of claim 1 wherein: the input end of the tube head (3) is provided with a taper hole-shaped leading-in part (31).
5. The dual-layer laying pipe of claim 4 wherein: the included angle between the inner wall of the leading-in part (31) and the inner wall of the pipe head (3) is 13 degrees.
6. The dual-layer laying pipe of claim 1 wherein: the inner pipe (2) and the outer pipe (1) are in transition fit, the maximum clearance is 0.2mm, and the maximum interference is 0.05 mm.
7. The dual-layer laying pipe of claim 6 wherein: the axial dimension of the inner pipe (2) is smaller than that of the outer pipe (1).
8. The dual-layer laying pipe of claim 6 wherein: the inner pipe (2) is as long as the outer pipe (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049099.9U CN210208108U (en) | 2019-07-06 | 2019-07-06 | Double-layer laying pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921049099.9U CN210208108U (en) | 2019-07-06 | 2019-07-06 | Double-layer laying pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210208108U true CN210208108U (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921049099.9U Active CN210208108U (en) | 2019-07-06 | 2019-07-06 | Double-layer laying pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210208108U (en) |
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2019
- 2019-07-06 CN CN201921049099.9U patent/CN210208108U/en active Active
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