Large-diameter low-pressure steel pipe formed by winding and welding

Abstract

The utility model discloses a large-caliber low-pressure steel pipe formed by winding and welding, the low-pressure steel pipe comprises an inner layer, a reinforcing layer and an outer layer, the inner layer, the reinforcing layer and the outer layer are fixed in sequence, the inner layer is an inner steel belt, the inner steel belt is spirally wound on winding pipes with different diameters, and the outer layer is an outer steel belt. The band edges of the inner steel band are matched, welded and fixed, the reinforcing layer is a reinforcing steel tube which is wound around the inner layer in a spiral mode, the reinforcing steel tube and the band face of the inner steel band are welded and fixed, and the outer layer is an outer steel band which is wound around the reinforcing steel tube in a spiral mode to be wrapped and pressed. The spirally wound band edges of the outer steel band are mutually matched, welded and fixed; the low-pressure steel pipe can ensure the structural strength, protect the structure in the pipe and improve the use effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production technical field of low pressure pipe especially relates to a winding and welding forming large -diameter low pressure steel pipe. BACKGROUND

[0002] At present, the plastic pipe is widely used in water supply and drainage pipe, natural gas conveying pipe, oil conveying pipe, sea conveying pipe and city construction water network engineering pipe to realize the goal of replacing steel with plastic. However, the large -diameter plastic reinforced water supply pipe has the defect of insufficient ring stiffness due to large diameter, so it is necessary to replace the plastic pipe with metal steel pipe, and the large -diameter metal steel pipe cannot be directly formed and needs to be wound and welded by metal steel belt.

[0003] Patent No. 202021837098.3 discloses a large -diameter reinforced low -pressure water supply pipe, which is wound by welding a plurality of sheet monomers. However, the outer sheet part and the inner sheet part need to be stacked and welded when winding the sheet monomer, and the overlapping area of the outer sheet part and the inner sheet part is large, which increases the pipe wall thickness. At the same time, more sheet monomers are needed to complete the winding of large diameter, which increases the production cost, and the wall thickness cannot be adjusted at will, the thickness of the sheet monomer cannot be changed arbitrarily, and the reinforcing pipe or reinforcing profile needs to be installed on the sheet monomer to ensure the strength after winding, which increases the complexity of processing and production of sheet monomers. UTILITY MODEL CONTENT

[0004] The technical problem to be solved by the utility model is to provide a winding and welding forming large -diameter low pressure steel pipe, which can guarantee the structural strength, protect the structure in the pipe and improve the use effect.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows: a winding and welding forming large -diameter low pressure steel pipe, the low pressure steel pipe comprises an inner layer, a reinforcing layer and an outer layer, the inner layer, the reinforcing layer and the outer layer are sequentially fixed, the inner layer is an inner steel belt, the inner steel belt is spirally wound on a winding pipe with different diameters, the edges of the inner steel belt are welded and fixed with each other, the reinforcing layer is a reinforcing steel pipe spirally wound around the inner layer, the reinforcing steel pipe and the surface of the inner steel belt are welded and fixed, the outer layer is an outer steel belt spirally wound around the reinforcing steel pipe and tightly wrapped, and the edges of the outer steel belt are welded and fixed with each other.

[0006] As a preferred scheme, the outer layer and the inner layer are further provided with a functional layer cooperating with the reinforcing layer.

[0007] As a preferred scheme, the functional layer is foamed heat insulation cotton filled into the gap of the spirally wound reinforcing steel pipe.

[0008] As a preferred scheme, the functional layer is a corrosion-resistant layer sprayed between the outer layer and the inner layer.

[0009] As a preferred scheme, the functional layer is a corrosion-resistant layer sprayed between the outer layer and the inner layer.

[0010] As a preferred scheme, a positioning edge strip is arranged on one side of the inner steel belt, and a positioning edge groove is arranged on the other side of the inner steel belt, and the positioning edge strip is clamped into the positioning edge groove.

[0011] As a preferred scheme, a plurality of reinforcing steel pipes are wound around each belt surface of the inner steel belt.

[0012] As a preferred scheme, the inner steel belt is a thick-walled steel belt, and the outer steel belt is a thin-walled steel belt.

[0013] As a preferred scheme, the edges of the outer steel belt are welded by pressure welding.

[0014] After the above technical scheme is adopted, the effect of the utility model is that: the large-diameter low-pressure steel pipe is formed by winding and welding, the low-pressure steel pipe comprises an inner layer, a reinforcing layer and an outer layer, the inner layer, the reinforcing layer and the outer layer are sequentially fixed, the inner layer is an inner steel belt, the inner steel belt is spirally wound around a winding pipe with different diameters, the edges of the inner steel belt are welded and fixed in cooperation with each other, the reinforcing layer is a reinforcing steel pipe spirally wound around the inner layer, the reinforcing steel pipe and the belt surface of the inner steel belt are welded and fixed, the outer layer is an outer steel belt spirally wound around the reinforcing steel pipe to press and tighten, and the edges of the outer steel belt are welded and fixed in cooperation with each other; first, the inner steel belt is spirally wound around the low-pressure steel pipe with the required diameter, then welded and fixed, the reinforcing steel pipe is continuously wound around the surface of the inner steel belt, welded and fixed again, and finally the outer steel belt is pressed on the reinforcing steel pipe to complete the final winding and welding, so that the outer layer formed by the outer steel belt tightly presses the reinforcing steel pipe, and the outer layer and the reinforcing steel pipe have friction therebetween, thereby reducing the axial sliding of the outer layer; the low-pressure steel pipe can guarantee the structural strength, protect the structure inside the pipe and improve the use effect.

[0015] In addition, the functional layer is arranged between the outer layer and the inner layer and cooperates with the reinforcing layer; the overall use effect of the low-pressure steel pipe is improved, and the practicality is increased.

[0016] In addition, the functional layer is a foamed insulation cotton filled into the gap of the spirally wound reinforcing steel pipe; the foamed insulation cotton can control the temperature inside the inner layer and reduce the influence of the outside temperature on the temperature inside the low-pressure pipe.

[0017] The functional layer is filled with plastic into the gap of the spiral wound reinforcing steel pipe, which can effectively strengthen the strength of the whole outer layer, inner layer and reinforcing layer, improve the pressure bearing capacity of the low-pressure steel pipe, and reduce the weight of the low-pressure steel pipe.

[0018] The functional layer is sprayed between the outer layer and the inner layer, which can effectively prolong the service life and improve the use effect.

[0019] The inner steel belt is wound with multiple turns of reinforcing steel pipes on each belt surface, which can ensure that the spiral wound inner steel belt is limited by the reinforcing steel pipes and improve the radial compressive strength of the inner layer.

[0020] The inner steel belt is wound with multiple turns of reinforcing steel pipes on each belt surface, which can ensure that the spiral wound inner steel belt is limited by the reinforcing steel pipes and improve the radial compressive strength of the inner layer.

[0021] The inner steel belt is thick-walled steel belt and the outer steel belt is thin-walled steel belt, the inner layer formed by the inner steel belt is mainly used to bear the pressure in the pipe, so it needs thick wall to improve the bearing capacity, and the outer layer formed by the outer steel belt is used to protect the internal structure and isolate the influence of the external environment on the inside.

[0022] The edges of the outer steel belt are welded by pressure welding, because the edges are in surface-to-surface contact, so the welding firmness can be improved by pressure welding to ensure the reliability of the overall welding quality of the outer layer. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described below in combination with the drawings and embodiments.

[0024] Figure 1 is the perspective view of the embodiment of the utility model;

[0025] Figure 2 is the sectional view of the embodiment of the utility model;

[0026] Figure 3 is Figure 2 A local enlarged view of the place;

[0027] In the drawings: 1, inner layer; 2, reinforcing layer; 3, outer layer; 4, inner steel belt; 5, reinforcing steel pipe; 6, outer steel belt; 7, positioning edge; 8, positioning edge slot. DETAILED DESCRIPTION

[0028] The utility model will be further described below in combination with the drawings and embodiments.

[0029] As Figures 1 to 3As shown, a large-diameter low-pressure steel pipe formed by spiral welding is disclosed. The low-pressure steel pipe includes an inner layer 1, a reinforcing layer 2, and an outer layer 3, which are fixed sequentially. The inner layer 1 is an inner steel strip 4, which is spirally wound around a winding tube of different diameters. The edges of the inner steel strip 4 are welded together. The reinforcing layer 2 is a reinforcing steel tube 5 spirally wound around the inner layer 1, and the reinforcing steel tube 5 is welded to the surface of the inner steel strip 4. The outer layer 3 is an outer steel strip 6 spirally wrapped and compressed around the reinforcing steel tube 5, and the edges of the outer steel strip 6 are welded together.

[0030] In this embodiment, a functional layer that works in conjunction with the reinforcing layer 2 is provided between the outer layer 3 and the inner layer 1; this improves the overall performance of the low-pressure steel pipe and increases its practicality.

[0031] Furthermore, the functional layer is filled with foamed insulation cotton in the gaps of the spirally wound reinforcing steel pipe 5. Since the reinforcing steel pipe 5 between the outer layer 3 and the inner layer 1 is spirally wound, there are gaps. Foamed insulation cotton is injected into the gap from the same end of the outer layer 3 and the inner layer 1. As the reinforcing steel pipe 5 is guided, it is continuously squeezed into the gap. As the foam expands, the filling is completed. The foamed insulation cotton can control the temperature inside the inner layer 1 and reduce the influence of the outside on the temperature inside the low-pressure pipeline.

[0032] Furthermore, the functional layer is filled with plastic into the gaps of the spirally wound reinforcing steel pipe 5; by melting the plastic and injecting it into the gaps, it can also flow with the reinforcing steel pipe 5 to fill the space between the outer layer 3 and the inner layer 1, thereby enhancing the internal strength, improving the pressure bearing capacity of the low-pressure steel pipe, and reducing the weight increase of the low-pressure steel pipe.

[0033] When injecting foamed insulation cotton or plastic, the inner steel strip 4, the reinforcing steel pipe 5 and the outer steel strip 6 are welded together. In this way, the spirally wound reinforcing steel pipe 5 forms a unique guide channel, resulting in a better filling effect.

[0034] Furthermore, the functional layer is an anti-corrosion layer sprayed between the outer layer 3 and the inner layer 1; when welding the outer steel strip 6, the strip surfaces of the reinforcing steel pipe 5 and the inner steel strip 4 are sprayed before welding the outer layer 3, which can effectively extend the service life and improve the performance.

[0035] like Figure 3 As shown, a positioning strip 7 is provided on one side of the inner steel strip 4, and a positioning groove 8 is provided on the other side of the inner steel strip 4. The positioning strip 7 is inserted into the positioning groove 8. When the positioning strip 7 and the positioning groove 8 are wound, the strip edges can be quickly and accurately put together, which facilitates welding and can effectively improve the welding strength and welding effect after welding.

[0036] Further, the inner steel belt 4 is wound with multiple turns of reinforcing steel pipes 5 on each belt surface; since the inner layer 1 is welded and fixed after being spirally wound by the inner steel belt 4, the multiple turns of reinforcing steel pipes 5 welded and fixed on the belt surface of the inner steel belt 4 can improve the radial compression strength and ensure stability and reliability during use.

[0037] In the embodiment, the inner steel belt 4 is a thick-walled steel belt, and the outer steel belt 6 is a thin-walled steel belt; the inner layer 1 formed by the inner steel belt 4 is mainly used to bear the internal pressure of the pipe, and thus needs to be thick-walled to improve the bearing capacity; and the outer layer 3 formed by the outer steel belt 6 is used to protect the internal structure and isolate the influence of the external environment on the inside.

[0038] Further, the edges of the outer steel belt 6 are welded by pressure welding; since the edges are in surface-to-surface contact, the welding firmness can be improved by pressure welding to ensure the overall welding quality of the outer layer 3 is reliable.

[0039] The above-described embodiments are only descriptions of preferred embodiments of the present application and are not intended to limit the scope of the present application; various modifications and improvements of the technical solutions of the present application made without departing from the design spirit of the present application shall all fall within the protection scope of the present application as defined by the claims.

Claims

1. A large-diameter low-pressure steel pipe formed by spiral wound welding, the low-pressure steel pipe comprising an inner layer, a reinforcing layer, and an outer layer, characterized in that: The inner layer, reinforcing layer, and outer layer are fixed sequentially. The inner layer is an inner steel strip, which is spirally wound around a winding tube of different diameters. The edges of the inner steel strip are welded together to fix it in place. The reinforcing layer is a reinforcing steel tube that is spirally wound around the inner layer. The reinforcing steel tube is welded to the surface of the inner steel strip. The outer layer is an outer steel strip that is spirally wrapped around the reinforcing steel tube and pressed tightly. The edges of the spirally wound outer steel strip are welded together to fix it in place.

2. The large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 1, characterized in that: A functional layer that works in conjunction with the reinforcing layer is also provided between the outer layer and the inner layer.

3. The large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 2, characterized in that: The functional layer consists of filling the gaps in the spirally wound reinforcing steel pipe with foamed insulation cotton.

4. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 2, characterized in that: The functional layer consists of plastic filling the gaps in the spirally wound reinforcing steel pipe.

5. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 2, characterized in that: The functional layer is an anti-corrosion layer sprayed between the outer layer and the inner layer.

6. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in any one of claims 3, 4, or 5, characterized in that: A positioning strip is provided on one side of the inner steel strip, and a positioning groove is provided on the other side of the inner steel strip. The positioning strip is inserted into the positioning groove.

7. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 6, characterized in that: The inner steel strip has multiple turns of reinforcing steel pipe wound on each strip surface.

8. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 7, characterized in that: The inner steel strip is a thick-walled steel strip, and the outer steel strip is a thin-walled steel strip.

9. A large-diameter low-pressure steel pipe formed by spiral wound welding as described in claim 1, characterized in that: The outer steel strip is welded to the outer steel strip by pressure welding.

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