CN112934984B - Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method - Google Patents
Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method Download PDFInfo
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- CN112934984B CN112934984B CN202110091751.9A CN202110091751A CN112934984B CN 112934984 B CN112934984 B CN 112934984B CN 202110091751 A CN202110091751 A CN 202110091751A CN 112934984 B CN112934984 B CN 112934984B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
- B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
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Abstract
The application discloses a circumferential prestress self-repairing laying pipe, processing equipment and a laying pipe self-repairing method, wherein the circumferential prestress self-repairing laying pipe comprises an outer pipe and an inner pipe, the inner pipe is lined in the outer pipe, and the inner pipe is in frictional contact with the outer pipe to restrain movement relative to the outer pipe; the inner tube includes a pre-twisted portion that imparts an elastic twist; when the spinning pipe is subjected to heating and cooling circulation, the inner pipe constrained to move relatively through frictional contact can rotate and slide relative to the outer pipe, the updating area and the updating speed of the inner surface of the inner pipe are improved, and the permanent frictional contact of any area of the inner wall of the inner pipe is avoided. Under the same excess steel amount, abnormal pipe replacement phenomena such as deep groove wire disorder and the like can be effectively reduced.
Description
Technical Field
The application relates to the technical field of laying pipes, in particular to a circumferential prestress self-repairing laying pipe, processing equipment and a laying pipe self-repairing method.
Background
Wire is one of the important varieties of steel products, and is widely applied to the building and product industries. At present, the countries mainly producing steel generally adopt a full-continuous high-speed torsion-free wire rod finishing mill group and a controlled cooling technology as main process equipment means for wire rod production.
High speed wire production is a continuous process from billet to finished product, and the laying head laying pipe is a key device for controlling the transition of wire from straight line to wire rod. The temperature of the rolled piece after finish rolling is kept at 850 ℃ approximately, the speed can be as high as 120m/s, after the rolled piece enters a spinning pipe, the wire rod moves forwards according to the spinning pipe under the comprehensive actions of driving force, relative inertia force, friction force, positive pressure and the like caused by a pinch roll and a spinning machine, the linear motion is changed into spiral motion, a stable coil with the diameter of 1080mm is formed, and the stable coil is discharged from the spinning pipe and evenly laid on a roller way.
A paper entitled "study and improvement of spatial curves of a laying pipe of a high-speed wire laying machine", published in journal 2006, volume 8, volume 11 of China engineering science "records that when the laying pipe works, the wire moves forwards in the laying pipe, and because of the backward friction resistance of the wall of the laying pipe, a certain micro-section of wire is always pushed and pulled by the front and rear adjacent parts of the wire, so that the wire has certain axial force and always runs along the central line direction of the wire; also described are a trend graph of the relative velocity of the wire in the laying pipe, a pressure profile (as shown in FIG. 6) against the inner wall of the laying pipe, and a friction profile (as shown in FIG. 7) against the inner wall of the laying pipe.
Through research and analysis, the wire is subjected to rapid increase after entering the inlet of the laying pipe, the position with the maximum friction force is about 500mm away from the inlet of the laying pipe, the inner wall of the laying pipe is severely abraded, and even the laying pipe is worn through after long-time work, so that steel piling accidents occur.
Abnormal wear of the laying pipe leading to excessively short service life and laying anomalies has been a major problem in wire production.
Disclosure of Invention
In view of the above problems, the present application provides a circumferential pre-stress self-repair laying pipe, a processing apparatus, and a laying pipe self-repair method.
In a first aspect, the present application provides a circumferential pre-stressed self-repairing laying pipe, which adopts the following technical scheme:
a circumferential pre-stressed self-repairing laying pipe comprises an outer pipe and an inner pipe, wherein the inner pipe is lined in the outer pipe, and the inner pipe restrains the movement relative to the outer pipe through the friction contact with the outer pipe; the inner tube includes a pre-twisted portion that imparts an elastic twist; and in the resetting process of the pre-twisting part, the part of the inner pipe lining the outer pipe rotates and slides relative to the outer pipe.
By adopting the technical scheme, the spinning pipe can experience heating and cooling circulation in work, the inner pipe which is in relative motion is restrained through frictional contact, the inner pipe is gradually displaced along the outer pipe, meanwhile, the twisted deformation part of the inner pipe and the downstream part of the inner pipe rotate and slide together, the large-area quick updating of the inner surface of the inner pipe is realized, and the durable frictional contact of any area of the inner wall of the inner pipe is avoided. Under the same excess steel amount, abnormal pipe replacement phenomena such as deep groove wire disorder and the like can be effectively reduced.
Optionally, the pre-twisted portion is twisted and deformed at one time, and a starting end of the twisted and deformed pre-twisted portion or an upstream of the starting end is fixedly connected with the outer tube.
By adopting the technical scheme, when the spinning pipe is subjected to heating and cooling circulation, the expansion force or the contraction force overcomes the friction force, the twisted and deformed part of the inner pipe releases the twisting stress, the deformation is gradually recovered, and the downstream part of the pre-twisted part is driven to rotate and slide together, so that the inner surface of the inner pipe is updated.
Optionally, the pre-twisted portion may be continuously twisted to deform so that the portion of the inner tube lining the outer tube is continuously slidable relative to the outer tube.
Through adopting above-mentioned technical scheme, sustainable external force orders about the inner tube and slides for the outer tube always for inner tube internal surface continuously updates, improves the utilization ratio of inner tube internal surface, effectively prolongs the life of laying pipe.
Optionally, the starting end of the pre-twist portion twist deformation is rotationally offset by greater than or equal to 10 ° with respect to the terminating end of the pre-twist portion twist deformation.
Optionally, the material of the inner pipe is selected from one of spring steel, duplex stainless steel, high-speed steel, precipitation hardening stainless steel, high manganese steel and nodular cast iron.
Optionally, the specification length of the inner tube is 1000-4000mm, and the thickness is 2-8 mm.
Optionally, the laying pipe further comprises a pipe head with an inlet and an outlet, and a connecting pipe is coaxially and fixedly connected at the outlet of the pipe head; the tube head is fixedly connected with the input end of the outer tube, and the inner lining of the connecting tube is arranged in the inner tube.
In a second aspect, the present application provides an apparatus for twisting a circumferentially pre-stressed self-repairing laying pipe by applying a rotational force to an inner pipe of the laying pipe to cause the inner pipe to have a tendency to rotate relative to the outer pipe.
Optionally, the twisting device for the laying pipe is a swing hydraulic cylinder, a key groove is formed at the position, opposite to the inlet, of the inner pipe, the outer pipe is fixed, a swing hydraulic cylinder is used for applying a rotating force to the center, opposite to the inlet, of the inner pipe, and the inner pipe and the outer pipe are welded at the inlet.
By adopting the technical scheme, the swing hydraulic cylinder has high precision and easy control, and can stably output larger torque; the swing hydraulic cylinder outputs torque to act on the inner pipe, the stress part of the inner pipe is distorted and deformed to form a pre-distortion part, and the pre-distortion part and the downstream part of the inner pipe can rotate and slide relative to the outer pipe.
Optionally, the spinning pipe twisting device comprises a transmission gear and a force application toothed ring which are meshed and connected, the transmission gear is rotatably mounted on the spinning pipe, and the force application toothed ring is fixedly arranged at the starting end or the upstream of the starting end of the pre-twisting part in a twisting deformation manner; the transmission gear is in meshed transmission connection with a power source for driving the pre-twisting part to be twisted and deformed.
By adopting the technical scheme, the rotary power source is temporarily fixed on the laying head through the clamp to drive the inner pipe to be distorted and deformed from the input end to the output end, when the laying pipe undergoes heating and cooling circulation, the expansion force or the contraction force overcomes the friction force, and when the inner pipe gradually displaces towards the output end of the outer pipe, the distortion stress drives the distortion deformation part of the inner pipe and the downstream part thereof to rotate and slide together, so that the large-area quick updating of the inner surface of the inner pipe is realized.
Optionally, the twisting processing equipment for the laying pipe comprises a transmission gear and a force application toothed ring which are in meshed connection, and an elastic piece arranged on the force application toothed ring, wherein the transmission gear is rotatably arranged on the laying pipe, and one end of the elastic piece, which is far away from the force application toothed ring, is fixedly connected with the starting end of the twisting deformation of the pre-twisting part or the upstream of the starting end; the transmission gear is in meshed transmission connection with a power source for driving the pre-twisting part to be twisted and deformed.
By adopting the technical scheme, the rotary power source is temporarily fixed on the spinning machine through the clamp, the rotary power source is started, the spring firstly deforms to store force, when the spinning pipe undergoes heating and cooling circulation, the expansion force or the contraction force overcomes the friction force, the inner pipe gradually displaces towards the output end of the outer pipe, meanwhile, the elastic force of the spring drives the whole inner pipe to gradually rotate and slide, and the large-area quick updating of the inner surface of the inner pipe is realized.
Optionally, the force application toothed ring is an independent fitting or is formed by an annular toothed groove pressed on the wall of the inner pipe.
In a third aspect, the present application provides a laying pipe self-repair method, which adopts the following technical scheme:
a self-repairing method for a laying pipe adopts laying pipe twisting processing equipment to realize the following processes:
providing a double-layer laying pipe having an inner pipe lining an outer pipe, the inner pipe constrained against movement relative to the outer pipe by frictional contact with the outer pipe;
applying a rotational force to the inner tube to cause the inner tube to have a tendency to rotate relative to the outer tube;
when the double layer laying pipe is subjected to heating or cooling, the portion of the inner pipe lining the outer pipe slides rotationally relative to the outer pipe.
By adopting the technical scheme, the laying pipe undergoes heating and cooling circulation, the inner pipe which is in relative motion is restrained through frictional contact and is gradually displaced along the outer pipe, and meanwhile, the pre-twisting part and the downstream part of the inner pipe can rotationally slide relative to the outer pipe by the rotating force exerted on the inner pipe, so that the updating area and the updating speed of the inner surface of the inner pipe are improved, and the abrasion problem of the transition area L of the laying pipe is better solved.
Optionally, the manner of applying a rotational force to the inner tube is: the outer pipe is fixed, a swing hydraulic cylinder is used for applying a rotating force to the inner pipe at the position opposite to the center of the inlet, and the inner pipe and the outer pipe are welded at the inlet.
Optionally, the manner of applying a rotational force to the inner tube is: a toothed ring structure is fixedly arranged at the inlet of the inner pipe, and a transmission gear is rotatably arranged on the outer pipe or the pipe head; the fixed outer tube uses rotary power source to be connected with the transmission gear transmission, and through tooth meshing transmission, the inner tube is ordered about and the distortion takes place to the output by the input to the output, fixes transmission gear.
Optionally, the manner of applying a rotational force to the inner tube is: an elastic part is fixedly connected at the inlet of the inner tube, a force application gear ring is fixedly connected on the elastic part, and a transmission gear is rotatably arranged on the outer tube or the tube head; the fixed outer pipe is in transmission connection with the transmission gear by using a rotary power source, and the elastic part is deformed to store force through tooth meshing transmission to fix the transmission gear; the inner tube is driven by the deformed elastic piece to gradually rotate and slide relative to the outer tube.
Optionally, the resilient member is in a compressed state.
Alternatively, the rotary power source may be continuously powered.
Drawings
FIG. 1 is a schematic structural view of a circumferentially prestressed self-repairing laying pipe of example 1;
FIG. 2 is a schematic view showing the fitting state of the inner and outer tubes in embodiment 1;
3A-3C are diagrammatic depictions showing the forces acting on the inner tube during heating and cooling cycles;
FIG. 4 is a schematic structural view of a circumferentially prestressed self-repairing laying pipe of example 3;
FIG. 5 is a schematic view of a tooth transmission structure in embodiment 4;
FIG. 6 is a graph of the pressure profile experienced by the inner wall of the laying pipe;
FIG. 7 is a graph showing the friction profile experienced by the inner wall of the laying pipe.
Description of reference numerals: 1. an outer tube; 2. an inner tube; 3. a pipe head; 31. a connecting ring; 32. a connecting pipe; 4. a transmission gear; 5. a force application toothed ring; 6. a spring.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
The embodiment of the application discloses a circumferential prestress self-repairing laying pipe.
Example 1
Referring to fig. 1 and 2, the circumferential prestress self-repairing laying pipe comprises an outer pipe 1 and an inner pipe 2, the outer pipe 1 is sequentially provided with a linear leading-in section 1A, a bending deformation section 1B and a stable section 1C from an input end to an output end, and the linear leading-in section 1A, the bending deformation section 1B and the stable section 1C are integrally formed. The material of the outer tube 1 is a thermally stable material commonly used for existing single-layer laying pipes, such as 10CrMo 918.
The inner tube 2 is a straight tube made of wear-resistant material, the axial dimension of the inner tube 2 is 1000-4000mm, and the wall thickness is 2-8 mm. 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, and the maximum interference is 0.05mm, so that the inner pipe 2 is only in frictional contact with the outer pipe 1 to restrict the movement relative to the outer pipe 1; the inner tube 2 and the outer tube 1 constitute a laying pipe body.
The wear-resistant material of the inner tube 2 can be spring steel, duplex stainless steel, high-speed steel, precipitation hardening stainless steel, high manganese steel, nodular cast iron and the like.
It has been shown that the internal wall of the laying pipe tends to produce accelerated localized wear in the transition region L between the straight lead-in section and the curved deformation section, which if left unchecked, could lead to premature grooving of the internal wall of the laying pipe, which in turn could lead to product penetration through the wall of the laying pipe.
The wear problem can be solved by the following means: the outer tube 1 is lined with an inner tube 2 and the inner tube 2 is only allowed to be constrained to move within the outer tube 1 by frictional contact between their respective inner and outer surfaces.
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.
Further, 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 FD on the inner pipe 2.
As shown in fig. 3A, since the inner pipe 2 is heated by being brought into contact with the hot rolled product, the inner pipe 2 will undergo expansion, thereby exerting forces in two directions opposite to the directions toward the inlet end (arrow FEE) and the outlet end (arrow FDE). The expansion forces FEE and FDE are sufficient to overcome the frictional resistance FF. The expansion force FEE is overcome by the combined force of the expansion force FDE and the driving force FD, causing the inner pipe 2 to be progressively displaced within the outer pipe 1 towards the output end of the outer pipe 1.
As shown in fig. 3B, when the temperature of the inner pipe 2 is stabilized, there is no expansion force or contraction force. The friction force FF overcomes the driving force FD so that the inner tube 2 remains fixed within the outer tube 1.
As shown in fig. 3C, when the inner tube 2 cools, the inner tube 2 will experience contraction, again applying opposing forces towards the inlet end (arrow CEE) and the outlet end (arrow CDE). The forces CEE and CDE are sufficient to overcome the frictional force FF. The contraction force CEE is overcome by the combined force of the contraction force CDE and the driving force FD, 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. Thus, under the same excess steel amount, the abrasion depth of the inner surface of the inner pipe 2 is reduced to about 15 percent of the prior art, thereby preventing abnormal pipe replacement phenomena such as deep groove wire disorder and the like.
In this application, the axial dimension of inner tube 2 is far less than the axial dimension of outer tube 1, certainly also can select to inlay the pipe for whole, and inner tube 2 is isometric with outer tube 1 promptly, and both can solve the excessive problem of laying head pipe inner wall local wear.
Example 2
The difference between the embodiment and the embodiment 1 is that the circumferential prestress self-repairing laying pipe of the embodiment applies rotary prestress to the inner pipe 2, and the stressed part of the inner pipe 2 is elastically twisted and deformed to form a pre-twisted part; in the resetting process of the pre-twisting part, the pre-twisting part and the downstream part of the inner pipe 2 can rotate and slide relative to the outer pipe 1, so that the updating area and the updating speed of the inner surface of the inner pipe 2 are improved, and the abrasion problem of the transition area L of the laying pipe is better solved.
In this embodiment, a swing hydraulic cylinder applies a rotational prestress to the inner tube 2; specifically, a key groove is machined at the input end of the inner pipe 2, the outer pipe 1 is fixed, a swing hydraulic cylinder is used for applying a rotating force to the center of the inner pipe 2 relative to the inlet, the rotating angle is larger than or equal to 10 degrees, and the inner pipe 1 and the outer pipe 1 are welded at the inlet.
Thus, when the laying pipe undergoes heating and cooling cycles, the expansion force or the contraction force overcomes the friction force, the torsional stress is released by the torsional deformation part of the inner pipe 2, the deformation is gradually recovered, and the downstream part of the pre-twisting part is driven to rotate and slide together, so that the updating of the inner surface of the inner pipe 2 is realized.
Example 3
The present embodiment is different from embodiment 2 in that the present embodiment applies a rotational prestress to the inner tube 2 by the tooth transmission structure in cooperation with the rotational power source.
Referring to fig. 4, in this embodiment, the circumferential pre-stressed self-repairing laying pipe further includes a pipe head 3, a main body of the pipe head 3 is a hollow tubular structure, an input end of the pipe head 3 has a tapered-hole-shaped guiding portion, an output end of the pipe head 3 is coaxially and fixedly connected with a connection ring 31 and a connection pipe 32, the connection ring 31 and the pipe head 3 have the same outer diameter, the connection pipe 32 and the pipe head 3 have the same inner diameter, and an inner diameter of the limit ring is larger than an outer diameter of the connection pipe 32, so that a space is left between the two, and the space is not smaller than the wall thickness of the inner pipe 2.
When the laying pipe main body is matched with the pipe head 3, the inner pipe 2 is sleeved on the connecting pipe 32, the input end of the inner pipe 2 extends into the interval between the connecting pipe 32 and the connecting ring 31, the input end of the outer pipe 1 abuts against the connecting ring 31, and finally the seam between the outer pipe 1 and the connecting ring 31 is welded.
The tooth transmission structure comprises a transmission gear 4 and a force application tooth ring 5, wherein the transmission gear 4 is rotatably arranged on the connecting ring 31 of the tube head 3 or rotatably arranged on the outer tube 1; correspondingly, an installation opening is formed in the connecting ring 31 or the pipe wall of the outer pipe 1 in a radial penetrating mode, the transmission gear 4 is installed in the installation opening through a rotating shaft, the transmission gear 4 is coaxial with the pipe head 3, and the tooth surface of the transmission gear 4 penetrates out of the installation opening. The pipe head 3 or the outer pipe 1 is provided with a limiting structure for keeping the gear in a fixed state, such as a jackscrew or a pawl structure.
The force application toothed ring 5 can be arranged as an independent accessory and fixedly connected to the end part of the inner pipe 2; alternatively, the urging teeth ring 5 is formed by pressing a tooth groove in the wall of the inner pipe 2. The outer diameter of the force application gear ring 5 is not more than the inner diameter of the outer pipe 1, and the force application gear ring can be sleeved on the connecting pipe 32 together with the inner pipe 2; the transmission gear 4 is meshed with the force application toothed ring 5.
The rotary power source is temporarily fixed on the laying head through a clamp and is in meshed transmission connection with the transmission gear 4. When the inner pipe 2 is applied with the torsional prestress, the rotary power source is started, the inner pipe 2 is driven to be distorted and deformed from the input end to the output end through the tooth meshing transmission, the rotary angle is larger than or equal to 10 degrees, the transmission gear 4 is fixed by the limiting structure, the rotary power source is stopped, and the rotary power source is dismounted from the laying head.
When the pipe to be spun undergoes heating and cooling cycles, the expansion force or the contraction force overcomes the friction force, and the driving force FD drives the inlet end of the inner pipe 2 to gradually displace towards the output end of the outer pipe 1 in the outer pipe 1; meanwhile, the torsional stress drives the torsional deformation part and the downstream part of the inner tube 2 to rotate and slide together, so that the large-area quick update of the inner surface of the inner tube 2 is realized.
When the laying head is normally stopped for trimming, the rotary power source is temporarily fixed, the fixed state of the transmission gear 4 is released, and the torsional prestress is applied to the inner tube 2 again, so that the high and new speed of the inner surface of the inner tube 2 is ensured.
If the rotary power source has a self-locking function, the rotary power source can be always fixed on the laying head, and the limit structure of the transmission gear 4 is cancelled; the torsion prestress is continuously applied to the inner tube 2 by the rotary power source.
The rotary power source can be selected from a motor, a cylinder and the like.
Example 4
The difference between the present embodiment and embodiment 3 is that, referring to fig. 5, the tooth transmission structure of the present embodiment includes a transmission gear 4, a force application toothed ring 5 and an elastic member, and the transmission gear 4 has the same structure and arrangement manner as the transmission gear 4 in embodiment 3; the force application gear ring 5 is an independent accessory and is positioned at the upstream of the input end of the inner pipe 2; the elastic element is positioned between the force application toothed ring 5 and the inner pipe 2 and fixedly connects the two. The outer diameter of the force application gear ring 5 is not larger than the inner diameter of the outer pipe 1.
The elastic member may be a spring 6, a torsion spring, a coil spring, or the like, and the spring 6 is taken as an example in the embodiment. One end of the spring 6 is fixedly connected with the end part of the inner tube 2, and the other end is fixedly connected with the force application toothed ring 5.
When the laying pipe main body is matched with the pipe head 3, the force application toothed ring 5 and the spring 6 are sleeved on the connecting pipe 32 along with the inner pipe 2, the input end of the outer pipe 1 abuts against the connecting ring 31, the transmission gear 4 is meshed and connected with the force application toothed ring 5, the spring 6 is compressed between the force application toothed ring 5 and the end part of the inner pipe 2, and finally the joint between the outer pipe 1 and the connecting ring 31 is welded.
The rotary power source is temporarily fixed on the laying head through a clamp and is in meshed transmission connection with the transmission gear 4. When torsional prestress is applied to the inner tube 2, a rotary power source is started, and the force application direction of the rotary power source is the same as the spiral direction of the spring 6; through tooth meshing transmission, the spring 6 firstly compresses and stores force and deformation and stores force, the transmission gear 4 is fixed by the limiting structure, and the rotary power source is stopped to be detached from the laying head. The spring force of the spring 6 acts on the inner tube 2 such that the inner tube 2 has a tendency to rotate.
When the pipe to be spun undergoes heating and cooling cycles, the expansion force or the contraction force overcomes the friction force, and the driving force FD and the elastic force of the spring 6 jointly drive the inlet end of the inner pipe 2 to gradually displace towards the output end of the outer pipe 1 in the outer pipe 1; meanwhile, the elastic force of the spring 6 drives the whole inner tube 2 to gradually rotate and slide, so that the large-area quick updating of the inner surface of the inner tube 2 is realized.
When the laying head is normally stopped for trimming, the rotary power source is temporarily fixed, the fixed state of the transmission gear 4 is released, the spring 6 is prestressed again, and the high and new speed of the inner surface of the inner tube 2 is ensured.
If the rotary power source has a self-locking function, the rotary power source can be always fixed on the laying head, and the limit structure of the transmission gear 4 is cancelled; the spring 6 is continuously prestressed by the rotary power source.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (18)
1. A circumference prestressing force selfreparing laying pipe which characterized in that: the device comprises an outer pipe (1) and an inner pipe (2), 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 restrain movement relative to the outer pipe (1);
the inner tube (2) comprises a pre-twisted portion which imparts an elastic twist, giving the inner tube (2) a tendency to rotate with respect to the outer tube (1);
when the circumferential prestress self-repairing spinning pipe is subjected to heating and cooling circulation, the pre-twisting part is reset, and the part of the inner pipe (2) which is lined in the outer pipe (1) rotates and slides relative to the outer pipe (1).
2. The circumferentially pre-stressed self-healing laying pipe of claim 1, wherein: the pre-twisting part is twisted and deformed at one time, and the starting end or the upstream of the starting end of the twisting and deformation of the pre-twisting part is fixedly connected with the outer pipe (1).
3. The circumferentially pre-stressed self-healing laying pipe of claim 1, wherein: the pre-twisting part can be continuously twisted and deformed, so that the part of the inner pipe (2) lining the outer pipe (1) can continuously slide relative to the outer pipe (1).
4. The circumferentially pre-stressed self-healing laying pipe of any one of claims 1 to 3, wherein: the starting end of the pre-twist portion twist deformation is rotationally offset by greater than or equal to 10 ° relative to the terminating end of the pre-twist portion twist deformation.
5. The circumferentially pre-stressed self-healing laying pipe of claim 1, wherein: the material of the inner pipe (2) is selected from one of spring steel, duplex stainless steel, high-speed steel, precipitation hardening stainless steel, high manganese steel and nodular cast iron.
6. The circumferentially pre-stressed self-healing laying pipe of claim 1, wherein: the specification length of the inner tube (2) is 1000-4000mm, and the thickness is 2-8 mm.
7. The circumferentially pre-stressed self-healing laying pipe of claim 1, wherein: the laying pipe also comprises a pipe head (3) with an inlet and an outlet, and a connecting pipe (32) is coaxially and fixedly connected at the outlet of the pipe head (3); the tube head (3) is fixedly connected with the input end of the outer tube (1), and the connecting tube (32) is lined in the inner tube (2).
8. An apparatus for twisting the circumferentially prestressed, self-repairing laying pipe of any one of claims 1, 3, 4-7, wherein: a rotational force is applied to the inner pipe (2) of the laying pipe to cause the inner pipe (2) to have a tendency to rotate relative to the outer pipe (1).
9. The laying pipe twisting apparatus according to claim 8, wherein: the spinning pipe twisting processing equipment comprises a transmission gear (4) and a force application toothed ring (5) which are meshed and connected, wherein the transmission gear (4) is rotatably arranged on the spinning pipe, and the force application toothed ring (5) is fixedly arranged at the starting end or the upstream of the starting end of the twisting deformation of the pre-twisting part;
the transmission gear (4) is in meshed transmission connection with a power source for driving the pre-twisting part to be twisted and deformed.
10. The laying pipe twisting apparatus according to claim 8, wherein: the twisting processing equipment for the spinning pipe comprises a transmission gear (4) and a force application toothed ring (5) which are meshed and connected, and an elastic piece arranged on the force application toothed ring (5), wherein the transmission gear (4) is rotatably arranged on the spinning pipe, and one end of the elastic piece, which is far away from the force application toothed ring (5), is fixedly connected with the starting end of the twisting deformation of the pre-twisting part or the upstream of the starting end;
the transmission gear (4) is in meshed transmission connection with a power source for driving the pre-twisting part to be twisted and deformed.
11. The laying pipe twisting apparatus according to claim 10, wherein: the force application toothed ring (5) is an independent accessory or is formed by an annular toothed groove pressed on the pipe wall of the inner pipe (2).
12. An apparatus for twisting the circumferentially prestressed, self-repairing laying pipe of any one of claims 1, 2, 4-7, wherein: applying a rotational force to the inner pipe (2) of the laying pipe to cause the inner pipe (2) to have a tendency to rotate relative to the outer pipe (1); the twisting processing equipment for the spinning pipe is a swing hydraulic cylinder, a key groove is processed at the position of the relative inlet of the inner pipe (2), the outer pipe (1) is fixed, a rotary force is applied to the position of the relative inlet center of the inner pipe (2) by using the swing hydraulic cylinder, and the inner pipe and the outer pipe are welded at the position of the inlet.
13. A self-repairing method for a laying pipe is characterized by comprising the following steps: use of the laying pipe twisting apparatus according to any one of claims 8 to 12 to effect the following:
providing a double-layer laying pipe having an inner pipe (2) lining an outer pipe (1), the inner pipe (2) constrained from movement relative to the outer pipe (1) by frictional contact with the outer pipe (1);
applying a rotating force to the inner tube (2) to make the inner tube (2) have a rotating trend relative to the outer tube (1);
when the double-layer laying pipe is heated or cooled, the part of the inner pipe (2) lining the outer pipe (1) slides in rotation relative to the outer pipe (1).
14. The laying pipe self-repair method of claim 13, wherein: the inner tube (2) is rotated by the following method: the outer pipe (1) is fixed, a swing hydraulic cylinder is used for applying a rotating force to the inner pipe (2) relative to the center of the inlet, and the inner pipe and the outer pipe are welded at the inlet.
15. The laying pipe self-repair method of claim 13, wherein: the inner tube (2) is rotated by the following method: a toothed ring structure is fixedly arranged at the inlet of the inner pipe (2), and a transmission gear (4) is rotatably arranged on the outer pipe (1) or the pipe head (3); the outer tube (1) is fixed, a rotary power source is in transmission connection with the transmission gear (4), the inner tube (2) is driven to be distorted and deformed from the input end to the output end through tooth meshing transmission, and the transmission gear (4) is fixed.
16. The laying pipe self-repair method of claim 13, wherein: the inner tube (2) is rotated by the following method: an elastic part is fixedly connected at the inlet of the inner tube (2), a force application gear ring (5) is fixedly connected on the elastic part, and a transmission gear (4) is rotatably arranged on the outer tube (1) or the tube head (3); the fixed outer tube (1) is in transmission connection with the transmission gear (4) by using a rotary power source, and the elastic part is deformed to store force through tooth meshing transmission to fix the transmission gear (4); the inner tube (2) is driven by the deformed elastic piece to rotate and slide gradually relative to the outer tube (1).
17. The laying pipe self-repair method of claim 16, wherein: the resilient member is in a compressed state.
18. The laying pipe self-repair method according to claim 15 or 16, wherein: the rotary power source can continuously provide power.
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| CN202110091751.9A CN112934984B (en) | 2021-01-23 | 2021-01-23 | Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method |
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| CN202110091751.9A CN112934984B (en) | 2021-01-23 | 2021-01-23 | Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method |
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| CN112934984B true CN112934984B (en) | 2022-02-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN200988054Y (en) * | 2006-11-21 | 2007-12-12 | 宝山钢铁股份有限公司 | Guide tube of wire producing machine |
| US8387428B2 (en) * | 2010-09-07 | 2013-03-05 | Siemens Industry, Inc. | Regenerative laying pipe |
| KR101652855B1 (en) * | 2015-02-24 | 2016-09-01 | 김용호 | Laying head pipe |
| CN109365550A (en) * | 2018-12-06 | 2019-02-22 | 重庆市利平机械有限公司 | Laying head with multistage combination forming device |
| CN110238205A (en) * | 2019-07-06 | 2019-09-17 | 北京杜根鸿运科技发展有限公司 | A kind of spinneret of self-healing |
| CN210280201U (en) * | 2019-07-06 | 2020-04-10 | 北京杜根鸿运科技发展有限公司 | Self-repairing laying pipe and pipe head thereof |
| CN111536365B (en) * | 2020-03-26 | 2021-10-01 | 江西武功建材有限公司 | Concrete conveying pipe repairing device and repairing method |
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