阅读说明：本技术 一种内嵌型吐丝管及内嵌型吐丝管内管规格选取方法 (Embedded type spinning pipe and specification selection method for internal pipe of embedded type spinning pipe ) 是由 张海霞 王斯琪 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种内嵌型吐丝管及内嵌型吐丝管内管材料选取方法,包括外管,所述外管具有直线导入段、弯曲变形段和稳定段,还包括由耐磨材料制成的内管,所述内管为直管,其轴向尺寸小于外管的轴向尺寸,所述内管从外管的直线导入段插入外管中,两者于入口端固定；所述外管由热稳定材料制成。本发明的内嵌型吐丝管能将整根高耐磨材料制成的管道应用于传统吐丝管中,解决吐丝管局部易磨穿的问题,延长吐丝管的使用寿命,提高生产量。(The invention discloses an embedded type laying pipe and a method for selecting a material of an inner pipe of the embedded type laying pipe, wherein the method comprises an outer pipe and an inner pipe, wherein the outer pipe is provided with a linear leading-in section, a bending deformation section and a stabilizing section; the outer tube is made of a thermally stable material. The embedded type laying pipe can apply the whole pipe made of high wear-resistant materials to the traditional laying pipe, solves the problem that the local part of the laying pipe is easy to wear through, prolongs the service life of the laying pipe and improves the production.)

1. An embedded laying pipe comprising an outer pipe having a straight lead-in section, a bending deformation section and a stabilizing section, characterized in that: the inner pipe is a straight pipe, the axial size of the inner pipe is smaller than that of the outer pipe, the inner pipe is inserted into the outer pipe from the linear leading-in section of the outer pipe, and the inner pipe and the outer pipe are fixed at the inlet end; the outer tube is made of a thermally stable material.

2. The inline laying pipe of claim 1 wherein: the inner pipe is made of any one of high-speed steel, precipitation hardening stainless steel, high manganese steel, nodular cast iron and duplex stainless steel.

3. The inline laying pipe of claim 1 or 2, wherein: the axial dimension of the inner tube is 500-2000 mm.

4. The inline laying pipe of claim 3 wherein: the wall thickness of the inner pipe is 2-10 mm.

5. A method for selecting specifications of an inner pipe of an embedded type spinning pipe is characterized by comprising the following steps: the method comprises the following steps:

step one, calculating the total unbalance of the laying head equipment;

step two, establishing inner pipe models with different lengths and wall thicknesses according to a laying pipe curve used by laying head equipment, bringing the material density of the inner pipe into the inner pipe models, calculating the total unbalance of each inner pipe, and forming a comparison table of the total unbalance, the length and the wall thickness of each inner pipe;

and step three, selecting the specification of the inner pipe within the allowable range of the total unbalance of the laying head equipment.

6. The method of claim 5 wherein the method of selecting a specification for an internal pipe of an inline laying pipe comprises: the basic data of the total unbalance of the laying head equipment in the first step are obtained from the following processes:

s1, determining the running speed, the precision rating and the self weight of the laying head equipment;

and S2, bringing the running speed of the laying head into the ISO 1940-1 dynamic balance test standard to check out the allowable unit mass unbalance, and multiplying the allowable unit mass unbalance by the self weight of the laying head to obtain the total unbalance of the laying head.

7. The method of claim 5 wherein the method of selecting a specification for an internal pipe of an inline laying pipe comprises: the second step comprises the following processes:

s1, scanning a laying pipe curve used by the laying head equipment in a 3D mode, importing the scanned data into CAD software, and establishing a CAD model of the laying pipe curve;

s2, establishing an inner tube model of each specification according to the CAD model;

s3, leading the density of the inner tube material into CAD software, and calculating the mass center coordinate and the weight of the inner tube of each specification of the corresponding material through the CAD software;

s4, comparing the coordinates of the mass center of the inner tube with the coordinates of the mass center of the CAD model to obtain the eccentricity of the inner tube, and multiplying the weight by the eccentricity to obtain the total unbalance of the corresponding inner tube;

and S5, forming a comparison table of total unbalance, length and wall thickness.

8. The method of claim 5 wherein the method of selecting a specification for an internal pipe of an inline laying pipe comprises: the laying pipe inner tube specifications include the length and wall thickness of the inner tube.

Technical Field

The invention relates to the technical field of laying pipes, in particular to an embedded laying pipe and a specification selection method of an internal pipe of the embedded 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.

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. 3) against the inner wall of the laying pipe, and a friction profile (as shown in FIG. 4) against the inner wall of the laying pipe.

Through research and analysis, the wire is subjected to a rapid increase after entering the inlet of the spinning pipe, the position with the maximum friction force is about 500mm away from the inlet of the spinning pipe, the position is the deformation initial section of the spinning pipe, the contact area of the wire and the wall of the spinning pipe is limited at the position, and the position is inevitably worn through firstly due to long-time abrasion. After the stripping, the position length of the abrasion exceeding 80% of the wall thickness only accounts for 5% of the total length of the material.

Currently, it is generally accepted in the industry that: by increasing the thickness of the spinning pipe wall, the wire rod is limited in a smaller space in the radial direction, the rolling speed of the wire rod can be increased, and the steel passing amount can be increased.

Patent document CN100333848C discloses a sleeve type in which the material thickness of the laying pipe inlet section is increased, i.e. the inner diameter of the laying pipe inlet section is reduced. However, in actual production, the laying pipe in the form of the sleeve can form deeper gullies at severely worn positions to cause the wire disorder, the service life of the laying pipe is shorter than that of a single-layer laying pipe, and the test proves that the wire is advanced due to the wire disorder when the wire is raised by at most 30%.

At present, the laying pipe is made of heat-stable materials, such as boiler pipe, duplex stainless steel and the like, but the wear resistance of the laying pipe is not excellent, for example, when the laying pipe made of 10CrMo918 material is used for rolling small-size wire rods, the steel passing amount does not exceed 3 kilotons, and the laying pipe needs to be replaced every day. The duplex stainless steel laying pipe has an excess steel amount of 1.5 ten thousand tons for about one week, but the duplex stainless steel laying pipe has not been accepted by the market due to the high selling price.

Wear-resistant materials such as high-speed steel and precipitation-hardened stainless steel have high strength, and cannot be forged into a continuous curved pipe such as a laying pipe. Patent document CN206199882U discloses a laying pipe structure of a laying head in a high-speed wire production line, which also adopts a sleeve form, and is different in that an inner pipe of the laying pipe structure is composed of a plurality of sections of nodular cast iron inner rings with the length not exceeding 4 cm. The ductile iron has high wear resistance required by the laying pipe, but the inner pipe of the multi-section structure can form a tangential groove after being bent, wires can be directly clamped when being wired in the inner pipe to cause wire disorder, and the tangential groove can scratch the wires to directly influence the quality of the wires. Therefore, the segmented inner tube is not feasible in practical application at all.

How to prolong the service life of the laying pipe and increase the steel excess of the laying pipe still remains the problem which needs to be solved urgently by production type enterprises.

Disclosure of Invention

The present invention is directed to an embedded laying pipe, which can be used in a conventional laying pipe for solving the problem of wear-out of the laying pipe, extending the service life of the laying pipe, and increasing the throughput.

The above object of the present invention is achieved by the following technical solutions:

an embedded type spinning pipe comprises an outer pipe, an inner pipe and a heating device, wherein the outer pipe is provided with a linear leading-in section, a bending deformation section and a stabilizing section, the inner pipe is made of wear-resistant materials, the inner pipe is a straight pipe, the axial size of the inner pipe is smaller than that of the outer pipe, the inner pipe is inserted into the outer pipe from the linear leading-in section of the outer pipe, and the inner pipe and the outer pipe are fixed at an inlet end; the outer tube is made of a thermally stable material.

By adopting the technical scheme, the inner pipe is embedded and fixed in the outer pipe from the straight line leading-in section of the outer pipe, the inner pipe of the straight pipe is not limited by the forging process of the material of the inner pipe, the application of special wear-resistant material in the spinning pipe is really realized, the wear resistance of the inlet of the straight line leading-in section and the bending deformation section of the spinning pipe is improved, the material thickness of the inlet section of the spinning pipe is thickened, the inner diameter of the inlet section of the spinning pipe is reduced, the friction stress of the wire is in direct proportion to the deviation distance of the theoretical track, the more the wire deviates from the theoretical track, the higher the wear rate of the; the wear-resistant inner pipe is close to the theoretical track by limiting the wire rod, the wear rate is reduced, the service life of the laying pipe is greatly prolonged, the consumption of the laying pipe in a factory is reduced, the frequency of replacing the laying pipe is correspondingly reduced, and the production efficiency and the economic benefit of the factory are effectively improved finally.

The invention is further configured to: the inner pipe is made of any one of high-speed steel, precipitation hardening stainless steel, high manganese steel, nodular cast iron and duplex stainless steel.

The invention is further configured to: the axial dimension of the inner tube is 500-2000 mm.

The invention is further configured to: the wall thickness of the inner pipe is 2-10 mm.

The invention also aims to provide a method for selecting the specification of the inner pipe of the embedded type spinning pipe, which is characterized in that the inner pipe made of wear-resistant materials is added on the premise of ensuring the normal use of the spinning pipe, so that the steel passing amount of the spinning pipe can be increased, and the production efficiency and the economic benefit of a factory are improved.

The above object of the present invention is achieved by the following technical solutions:

a specification selection method for an inner pipe of an embedded type spinning pipe comprises the following steps:

step one, calculating the total unbalance of the laying head equipment;

step two, establishing inner pipe models with different lengths and wall thicknesses according to a laying pipe curve used by laying head equipment, bringing the material density of the inner pipe into the inner pipe models, calculating the total unbalance of each inner pipe, and forming a comparison table of the total unbalance, the length and the wall thickness of each inner pipe;

and step three, selecting the specification of the inner pipe within the allowable range of the total unbalance of the laying head equipment.

The invention is further configured to: the basic data of the total unbalance of the laying head equipment in the first step are obtained from the following processes:

s1, determining the running speed, the precision rating and the self weight of the laying head equipment;

and S2, bringing the running speed of the laying head into the ISO 1940-1 dynamic balance test standard to check out the allowable unit mass unbalance, and multiplying the allowable unit mass unbalance by the self weight of the laying head to obtain the total unbalance of the laying head.

The invention is further configured to: the second step comprises the following processes:

s1, scanning a laying pipe curve used by the laying head equipment in a 3D mode, importing the scanned data into CAD software, and establishing a CAD model of the laying pipe curve;

s2, establishing an inner tube model of each specification according to the CAD model;

s3, leading the density of the inner tube material into CAD software, and calculating the mass center coordinate and the weight of the inner tube of each specification of the corresponding material through the CAD software;

s4, comparing the coordinates of the mass center of the inner tube with the coordinates of the mass center of the CAD model to obtain the eccentricity of the inner tube, and multiplying the weight by the eccentricity to obtain the total unbalance of the corresponding inner tube;

and S5, forming a comparison table of total unbalance, length and wall thickness.

The invention is further configured to: the laying pipe inner tube specifications include the length and wall thickness of the inner tube.

In conclusion, the invention has the following beneficial effects: the inner pipe made of wear-resistant materials is added on the premise of ensuring the normal use of the spinning pipe (the dynamic balance of the spinning pipe is not damaged and the wire disorder caused by deformation does not occur in the process of use), the steel amount can be increased by more than five times, the service life of the spinning pipe is prolonged beyond the expectation, the influence of unplanned shutdown maintenance on the normal production order of a factory is avoided, and the improvement on the production efficiency and the economic benefit of the factory is remarkable.

Drawings

FIG. 1 is a schematic structural view of an outer tube in the example;

FIG. 2 is a schematic diagram of a semi-finished product of the inline laying pipe in the example;

FIG. 3 is a graph of the pressure profile experienced by the inner wall of the laying pipe;

FIG. 4 is a graph of the friction profile experienced by the inner wall of the laying pipe.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.