Hole mesh steel belt winding reinforced composite pipe

Abstract

The utility model relates to the technical field of composite pipe production, and discloses a hole net steel belt winding reinforced composite pipe. Comprising a plastic core pipe and a first hole net steel belt wound on the radial outer side of the plastic core pipe in the first spiral direction. The second hole net steel belt is wound on the radial outer side of the first hole net steel belt in the second spiral direction opposite to the first spiral direction and forms a steel belt overlapping area; the plastic outer layer is arranged on the radial outer side of the second hole net steel belt; a first hole distribution area and a second hole distribution area are arranged on the first hole net steel belt and the second hole net steel belt respectively, a plurality of first through holes and second through holes are formed in the first hole distribution area and the second hole distribution area respectively, and at least part of the second through holes can be at least partially overlapped with the first through holes to form through holes. And the through holes are distributed in the central area of the steel belt overlapping area. By means of the technical scheme, the strength loss of the hole net steel belt is reduced to a large extent, and then the pressure bearing capacity of the composite pipe is improved.

Description

Perforated steel strip spiral reinforced composite pipe Technical Field

[0001] This utility model relates to the field of composite pipe production technology, specifically to a perforated steel strip wound reinforced composite pipe. Background Technology

[0002] Thermoplastic composite pipes are pipes made primarily from thermoplastic plastics through an extrusion process. They typically consist of an inner pipe layer for transporting media and an outer protective pipe layer. To improve the rigidity of the composite pipe, a perforated steel strip is usually installed between the inner pipe layer and the outer protective pipe layer to form a reinforcing skeleton, thereby increasing the rigidity of the composite pipe.

[0003] Currently, the main methods for arranging perforated steel strips are: first, welding the perforated steel strips into a tubular skeleton, and then using a composite mold to form the composite. However, because the perforated steel strips are formed by welding, the welding quality requirements are high, and the welding operation is quite difficult. Moreover, the inner and outer layers of the composite pipe are formed in the mold using a composite mold, further increasing the difficulty and complexity of the manufacturing process. At the same time, because the perforated steel strips are welded into a tubular shape, the finished composite pipes cannot be coiled, which is not conducive to the storage and transportation of the composite pipes. Furthermore, the non-perforated parts of the perforated steel strips are prone to delamination with the inner and outer plastic layers, resulting in low bonding strength between the inner plastic layer, the perforated steel strip, and the outer plastic layer.

[0004] In addition, existing technologies also involve spirally winding perforated steel strips onto a plastic core tube using a winding machine, and then attaching a plastic outer tube. While this arrangement of perforated steel strips facilitates coiling of the composite pipe and improves the overall structural stability of the composite pipe to some extent, the uniform arrangement of multiple holes on the steel strip results in a significant loss of strength. Furthermore, in perforated steel strip wound reinforced plastic composite pipes, the internal pressure borne by the pipe is mainly borne by the perforated steel strip winding reinforcement layer, leading to a significant loss of steel strip strength and thus reducing the strength of the composite pipe. Summary of the Invention

[0005] The purpose of this invention is to overcome the technical problem of significant strength loss in existing perforated steel strips and to provide a perforated steel strip wound reinforced composite pipe.

[0006] This utility model provides a perforated steel strip wound reinforced composite pipe, comprising: a plastic core tube, a first perforated steel strip, a second perforated steel strip, and a plastic outer layer. The first perforated steel strip has a first perforated area with multiple first through holes. The first perforated steel strip is wound radially outward along a first helical direction around the plastic core tube. The second perforated steel strip has a second perforated area with multiple second through holes. The second perforated steel strip is wound radially outward along a second helical direction opposite to the first helical direction. Along the radial direction of the plastic core tube, the projected overlap areas of the second and first perforated steel strips form a steel strip overlap area. At least a portion of the second through holes can at least partially overlap with the first through holes, forming through holes. The plastic outer layer is disposed radially outward of the second perforated steel strip. At least a portion of the through holes are distributed in the central region of the steel strip overlap area.

[0007] Through the above technical solution, a first perforated steel strip has a first perforated area, and a first through hole is formed within the first perforated area. A second perforated steel strip has a second perforated area, and a second through hole is formed within the second perforated area. The second perforated steel strip is wound around the radial outer side of the first perforated steel strip. Along the radial direction of the plastic core tube, the projections of the first and second perforated steel strips form an overlapping area. The second through hole can at least partially overlap with the first through hole to form a through hole. At least some of the through holes are distributed in the central area of ​​the overlapping area. Compared with existing perforated steel strips, in the perforated steel strip wound reinforced composite pipe of this application, the first and second perforated steel strips only need to be perforated in some areas, so that a through hole is formed in the central area of ​​the overlapping area. This greatly reduces the strength loss of the perforated steel strip, making the reinforcing layer formed by winding the perforated steel strip of this utility model on the plastic core tube have a strong pressure-bearing capacity, thereby improving the pressure-bearing capacity of the composite pipe. Moreover, the plastic outer layer and the plastic core tube can form a "rivet" structure through the through hole, thereby improving the overall structural stability and rigidity of the composite tube.

[0008] In addition, the first perforated steel strip is wound around the radial outside of the plastic core tube along the first helical direction, and the second perforated steel strip is wound around the radial outside of the first perforated steel strip along the second helical direction. The first helical direction is opposite to the second helical direction. On the one hand, this further improves the rigidity of the composite tube; on the other hand, it makes the composite tube easier to coil, which is beneficial to the storage and transportation of the composite tube.

[0009] In some embodiments, along the length of the first perforated steel strip, the centerline of the first perforated area coincides with the centerline of the first perforated steel strip; along the length of the second perforated steel strip, the centerline of the second perforated area coincides with the centerline of the second perforated steel strip.

[0010] In some embodiments, the width of the first perforated area does not exceed 2 / 3 of the width of the first perforated steel strip, and the width of the second perforated area does not exceed 2 / 3 of the width of the second perforated steel strip.

[0011] In some embodiments, the first through hole has a major axis and a minor axis that are perpendicular to each other, the length of the major axis being greater than the length of the minor axis; the second through hole has a major axis and a minor axis that are perpendicular to each other, the length of the major axis being greater than the length of the minor axis.

[0012] In some embodiments, the major axis of the first through hole is not parallel to the length and width directions of the first perforated steel strip; the major axis of the second through hole is not parallel to the length and width directions of the second perforated steel strip.

[0013] In some embodiments, the angle between the major axis of the first through hole and the length direction of the first perforated steel strip forms a first perforation angle, and the angle between the first helical direction and the axial direction of the plastic core tube forms a first helical angle; the angle between the major axis of the second through hole and the length direction of the second perforated steel strip forms a second perforation angle, and the angle between the second helical direction and the axial direction of the plastic core tube forms a second helical angle; the first perforation angle is equal to the second perforation angle, the first helical angle is equal to the second helical angle, and the calculation relationship between the first perforation angle, the second perforation angle, the first helical angle, and the second helical angle satisfies:

[0014] α-10°≤β≤α+10°;

[0015] Wherein, α represents the first helix angle and the second helix angle;

[0016] β represents the first aperture angle and the second aperture angle.

[0017] In some embodiments, multiple rows of first through holes are formed in the first perforated area along the length direction of the first perforated steel strip; and multiple rows of second through holes are formed in the second perforated area along the length direction of the second perforated steel strip.

[0018] In some embodiments, along the length direction of the first perforated steel strip, there is a spacing between any two adjacent first through holes; along the length direction of the second perforated steel strip, there is a spacing between any two adjacent second through holes.

[0019] In some embodiments, multiple rows of first through holes are formed in the first perforated area along the length of the first perforated steel strip, and there is a row spacing between any two adjacent rows of first through holes; multiple rows of second through holes are formed in the second perforated area along the length of the second perforated steel strip, and there is a row spacing between any two adjacent rows of second through holes.

[0020] In some embodiments, the composite tube further includes a first adhesive layer bonded to the radially outer side of the second perforated steel strip, and the plastic outer layer is bonded to the outer peripheral surface of the first adhesive layer.

[0021] In some embodiments, the first through hole and the second through hole are identical to each other.

[0022] In some embodiments, the first perforated steel strip is wound around the radial outer side of the plastic core tube along the first helical direction and forms a first gap, and the second perforated steel strip is wound around the radial outer side of the first perforated steel strip along the second helical direction and forms a second gap, and at least a portion of the first gap and the second gap form the through hole.

[0023] In some embodiments, at least a portion of the first through hole and the second gap can form the through hole; and / or, at least a portion of the second through hole and the first gap can form the through hole.

[0024] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0025] Figure 1 is a schematic diagram of a single row of through holes on a perforated steel strip disclosed in this utility model;

[0026] Figure 2 is a schematic diagram of the structure of the perforated steel strip disclosed in this utility model, which has two rows of through holes.

[0027] Figure 3 is a schematic diagram of the structure of the perforated steel strip disclosed in this utility model having three rows of through holes;

[0028] Figure 4 is a three-dimensional structural diagram of a composite pipe in which a reinforcing layer is formed by winding the perforated steel strip shown in Figure 1.

[0029] Figure 5 is the front view of Figure 4;

[0030] Figure 6 is a three-dimensional structural diagram of a composite pipe in which a reinforcing layer is formed by winding the perforated steel strip shown in Figure 2;

[0031] Figure 7 is the front view of Figure 6;

[0032] Figure 8 is a schematic diagram of the unfolded perforated steel strip in Figure 4;

[0033] Figure 9 is a schematic diagram of the unfolded perforated steel strip in Figure 6.

[0034] Explanation of reference numerals in the attached figures

[0035] 1-Plastic core tube; 2-Perforated steel strip; 3-Through hole; 4-Plastic outer layer; 5-First adhesive layer; 6-First perforated steel strip; 7-Second perforated steel strip; 8-First through hole; 9-Second through hole; 10-Overlapping area of ​​steel strip; 11-Through hole. Detailed Implementation

[0036] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0037] In this utility model, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this utility model, the descriptions using terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In the production process of thermoplastic reinforced composite pipes, to improve the rigidity of the pipe, a perforated steel strip is typically placed between the inner plastic core and the outer plastic outer layer to form a reinforcing skeleton, thereby increasing the rigidity of the composite pipe. Currently, existing technologies generally involve uniformly perforating a steel strip to form a perforated steel strip, then welding or spirally winding this perforated steel strip onto the plastic core, and finally laminating a plastic outer layer onto the outside of the perforated steel strip to form the reinforced composite pipe. However, the uniform arrangement of multiple perforations on the steel strip results in a significant strength loss. In perforated steel strip wound reinforced plastic composite pipes, the internal pressure borne by the pipe is mainly borne by the reinforcing layer, leading to a substantial strength loss in the steel strip and thus reducing the overall strength of the composite pipe.

[0042] This utility model addresses the technical problem of significant strength loss in existing reinforced composite pipes due to the perforated steel strip. It provides a perforated steel strip wound reinforced composite pipe, as shown in Figures 1-9. The composite pipe includes: a plastic core tube 1, a perforated steel strip 2 wound radially outside the plastic core tube 1, and a plastic outer layer 4 disposed radially outside the perforated steel strip 2. The perforated steel strip 2 has a perforated area.

[0043] According to a preferred embodiment of the perforated steel strip wound reinforced composite pipe provided by this utility model, the perforated steel strip 2 includes a first perforated steel strip 6 and a second perforated steel strip 7. The perforated area includes a first perforated area on the first perforated steel strip 6 and a second perforated area on the second perforated steel strip 7. The through holes 3 include a first through hole 8 formed in the first perforated area and a second through hole 9 formed in the second perforated area. The first perforated steel strip 6 is wound radially outward along a first helical direction on the plastic core tube 1. The second perforated steel strip 7 is wound radially outward along a second helical direction opposite to the first helical direction on the first perforated steel strip 6. Along the radial direction of the plastic core tube 1, the projected overlapping areas of the second perforated steel strip 7 and the first perforated steel strip 6 form a steel strip overlapping area 10. At least a portion of the second through holes 9 can at least partially overlap with the first through holes 8 to form through holes 11. The plastic outer layer 4 is disposed radially outward on the second perforated steel strip 7. At least a portion of the through holes 11 are distributed in the central area of ​​the steel strip overlapping area 10.

[0044] In the perforated steel strip wound reinforced composite pipe provided by this utility model, the first perforated steel strip 6 is provided with a first perforated area, and the first through hole 8 is opened in the first perforated area. The second perforated steel strip 7 is provided with a second perforated area, and the second through hole 9 is opened in the second perforated area. The second perforated steel strip 7 is wound around the radial outer side of the first perforated steel strip 6. Along the radial direction of the plastic core tube 1, the projections of the first perforated steel strip 6 and the second perforated steel strip 7 form a steel strip overlapping area 10. The second through hole 9 can at least partially overlap with the first through hole 8 to form a through hole 11. The through hole 11 is distributed in the central area of ​​the steel strip overlapping area 10. Compared to existing perforated steel strips, in the perforated steel strip wound reinforced composite pipe of this application, the first perforated steel strip 6 and the second perforated steel strip 7 only need to be perforated in certain areas, so that a through hole 11 is formed in the central area of ​​the overlapping area 10 of the steel strips. This greatly reduces the strength loss of the perforated steel strip 2, making the reinforcing layer formed by winding the perforated steel strip 2 on the plastic core tube 1 with strong pressure resistance, thereby improving the pressure resistance of the composite pipe. Moreover, within the overlapping area 10 of the steel strips, the second through hole 9 can at least partially overlap with the first through hole 8 to form a through hole 11. In this way, the plastic outer layer 4 and the plastic core tube 1 can form a "rivet" structure through the through hole 11, thereby improving the overall structural stability and rigidity of the composite pipe.

[0045] In some embodiments, the perforated area can be located at any position on the perforated steel strip 2. For example, the perforated area can be located in the upper middle or lower middle part of the perforated steel strip 2, as long as a through hole 11 can be formed in the central area of ​​the overlapping area 10 of the steel strip. Alternatively, according to a preferred embodiment of the present invention, the perforated area is located in the middle position of the perforated steel strip 2. Specifically, referring to Figures 1-3, the perforated steel strip 2 is generally strip-shaped, so the perforated area is also set as a strip shape, and the center line of the perforated area coincides with the center line of the perforated steel strip 2, so that the perforated area is formed in the middle position of the perforated steel strip 2. That is, the perforated area is distributed on both sides of the center line with the center line of the perforated steel strip 2 as the axis of symmetry. This is beneficial to improving the uniformity of the distribution of the through holes 11, and thus beneficial to improving the overall structural stability and rigidity of the composite pipe.

[0046] In some embodiments, the perforated area is formed in the middle of the perforated steel strip 2, and the width of the perforated area does not exceed 2 / 3 of the width of the perforated steel strip 2. Referring to Figures 1-3, the width of the perforated area is W2, and the width of the perforated steel strip is W1. This reduces the opening area on the perforated steel strip 2, thereby helping to reduce the strength loss caused by the opening to the perforated steel strip 2.

[0047] In some embodiments, the shape of the through hole 3 can be arbitrary, such as a round hole, a square hole, a triangular hole, etc. Or, according to a preferred embodiment of the present invention, as shown in Figures 1-3, the through hole 3 is an elongated hole, such as a waist-shaped hole, a rectangular hole, an elongated polygonal hole, etc. That is, the through hole 3 is formed as a through hole with a major axis and a minor axis that are perpendicular to each other, wherein the major axis and the minor axis are respectively the axes of symmetry of the through hole 3, and the length of the major axis is greater than the length of the minor axis. The through hole 3 is made into an elongated shape, that is, the first perforated steel strip 6 is wound around the radial outer side of the plastic core tube 1 along the first spiral direction, and the second perforated steel strip 7 is wound around the radial outer side of the first perforated steel strip 6 along the second spiral direction. The first spiral direction is opposite to the second spiral direction. Setting the first through hole 8 and the second through hole 9 as elongated shapes is beneficial to make the second through hole 9 overlap with the first through hole 8, thereby forming a through hole 11. Furthermore, setting the first through hole 8 and the second through hole 9 as elongated shapes is also beneficial to increasing the cross-sectional area of ​​the through hole 11, thereby improving the overall structural stability and rigidity of the composite pipe.

[0048] In some embodiments, the orientation of the through hole 3 can be arbitrary, that is, the angle formed by the major axis of the through hole 3 and the length direction of the perforated steel strip 2 can be any angle. Alternatively, in one embodiment, the major axis of the through hole 3 is not parallel to the length direction of the perforated steel strip 2, and at the same time, the major axis of the through hole 3 is not parallel to the width direction of the perforated steel strip 2. Specifically, the angle formed by the major axis of the through hole 3 and the length direction of the perforated steel strip 2 is defined as the hole arrangement angle β. That is, the hole arrangement angle β is not equal to 0, nor is it equal to 90°. In this way, the loss of strength of the perforated steel strip 2 caused by the arrangement of the through hole 3 parallel to the length direction of the perforated steel strip 2 and the arrangement of the through hole 3 parallel to the width direction of the perforated steel strip 2 can be reduced.

[0049] Further, according to a preferred embodiment of the composite pipe provided by this utility model, and in conjunction with Figures 1-3, 8, and 9, a first perforated steel strip 6 is wound radially outward along a first helical direction around the plastic core tube 1. The angle between the first helical direction and the axial direction of the plastic core tube 1 forms a first helical angle. A second perforated steel strip 7 is wound radially outward along a second helical direction around the first perforated steel strip 6. The angle between the second helical direction and the axial direction of the plastic core tube 1 forms a second helical angle. The first helical angle and the second helical angle are equal. Multiple first through holes 8 are formed in the first perforation area on the first perforated steel strip 6, and multiple second through holes 9 are formed in the second perforation area on the second perforated steel strip 7. The angle between the major axis of the first through hole 8 and the length direction of the first perforated steel strip 6 forms a first perforation angle, and the angle between the major axis of the second through hole 9 and the length direction of the second perforated steel strip 7 forms a second perforation angle. The first perforation angle is equal to the second perforation angle. Moreover, the calculation relationship between the first perforation angle, the second perforation angle, the first helical angle, and the second helical angle satisfies:

[0050] α-10°≤β≤α+10°;

[0051] Where α is the first helix angle and the second helix angle;

[0052] β represents the first and second pore angles.

[0053] The above technical solution can further increase the overlap probability of the first through hole 8 and the second through hole 9, as well as the cross-sectional area of ​​the through hole 11 formed by the overlap of the first through hole 8 and the second through hole 9, thereby improving the overall structural stability and rigidity of the composite pipe.

[0054] It should be noted that, according to one embodiment of the composite pipe provided by this utility model, the optimal force-bearing angle of the first helix angle and the second helix angle is 54.73°. Therefore, the preferred angle range of the first hole angle and the second hole angle is 44.73°-64.73°, which can improve the overlap probability of the first through hole 8 and the second through hole 9 and the cross-sectional area of ​​the through hole 11 formed by the overlap of the first through hole 8 and the second through hole 9.

[0055] Furthermore, the first through hole 8 and the second through hole 9 are identical to each other, that is, the first through hole 8 and the second through hole 9 have the same shape and size.

[0056] In some embodiments, the perforated steel strip 2 has a perforated area, within which multiple through holes 3 are formed, and these through holes 3 can be randomly distributed. Alternatively, according to one embodiment of the composite pipe of this utility model, the multiple through holes 3 are arranged in rows within the perforated area. Further, referring to Figures 1 to 9, depending on actual production needs, a single row or multiple rows of through holes 3 can be formed within the perforated area. Compared to forming a single row of through holes 3, forming multiple rows of through holes 3 can further reduce the opening area, thereby further reducing the strength loss of the perforated steel strip 2 caused by forming the through holes 3.

[0057] In some embodiments, as shown in Figures 1, 4-5, and 8, multiple through holes 3 are formed within the perforated area, arranged in a single row, with a spacing A between any two adjacent through holes 3. In a preferred embodiment, this spacing A is not less than 3 mm, which helps to reduce the strength loss of the perforated steel strip 2.

[0058] In some embodiments, as shown in Figures 2-3, 6-7, and 9, multiple through holes 3 are formed within the perforated area. These through holes 3 are arranged in multiple rows, and a distance A exists between any two adjacent through holes 3 in the same row. In a preferred embodiment, this distance A is not less than 3 mm, which helps to reduce the strength loss of the perforated steel strip 2. Furthermore, a row spacing B exists between any two adjacent rows of through holes 3. In a preferred embodiment, this row spacing B is not less than 3 mm, which helps to reduce the strength loss of the perforated steel strip 2.

[0059] In some embodiments, referring to Figures 4-9, a first perforated steel strip 6 is wound at intervals along a first helical direction around the radially outer side of the plastic core tube 1 to form a first gap. A second perforated steel strip 7 is wound at intervals along a second helical direction around the radially outer side of the first perforated steel strip 6 to form a second gap. At least a portion of the second gap can overlap with at least a portion of the first gap to form a through hole 11. Referring to Figures 4-9, the second perforated steel strip 7, wound around the radially outer side of the first perforated steel strip 6, can form multiple overlapping steel strip regions 10, which are parallelograms. According to a preferred embodiment of the present invention, the parameters of the first perforated steel strip 6 and the second perforated steel strip 7 are the same, so the overlapping steel strip region 10 is rhomboid, and the four corners of this rhombus are the through holes 11 formed by at least a portion of the second gap overlapping with the first gap.

[0060] Furthermore, the first gap and the second through hole 9 can also form a through hole 11, and the second gap and the first through hole 8 can also form a through hole 11. That is, through holes 11 are formed on the four sides of the parallelogram-shaped steel strip overlapping area 10, thereby further increasing the probability of forming through holes 11 and the total cross-sectional area of ​​the formed through holes 11. Moreover, through holes 11 are formed at the four vertices, four sides and the central area of ​​the steel strip overlapping area 10, which is conducive to improving the overall structural stability and rigidity of the composite pipe.

[0061] It should be noted that the second perforated steel strip 7 is spirally wound around the radial outer side of the first perforated steel strip 6, forming a steel strip overlapping area 10. At least a portion of the first perforated area is located in the central area of ​​the steel strip overlapping area 10, such that at least a portion of the first through holes 8 are located in this central area, and at least a portion of the second perforated area is located in this central area, such that at least a portion of the second through holes 9 are located in this central area, thereby allowing at least a portion of the second through holes 9 to overlap with the first through holes 8 to form a through hole 11. According to a preferred embodiment of the present invention, as mentioned above, the first perforated area is located in the middle position of the first perforated steel strip 6, and the second perforated area is located in the middle position of the second perforated steel strip 7. Thus, as the second perforated steel strip 7 spirally wound around the radial outer side of the first perforated steel strip 6, the second perforated area also spirally wound around the radial outer side of the first perforated area. Along the radial direction of the plastic core tube 1, at least a portion of the second perforated area overlaps with the projection of the first perforated area, and this overlapping portion forms the central area of ​​the steel strip overlapping area 10.

[0062] In some embodiments, as shown in Figures 4-7, the composite tube provided by this invention further includes a first adhesive layer 5 bonded to the radially outer side of the second perforated steel strip 7, and a plastic outer layer 4 bonded to the outer circumferential surface of the first adhesive layer 5. The first adhesive layer 5 is bonded to the radially outer side of the second perforated steel strip 7. After being heated and melted, the first adhesive layer 5 can pass through the through hole 11, thereby bonding the plastic outer layer 4 to the plastic core tube 1, improving the overall structural stability of the composite tube. Alternatively, the plastic outer layer 4 can be directly bonded to the outer circumferential surface of the second perforated steel strip 7. During the bonding process, the plastic outer layer 4 is heated, allowing it to pass through the through hole 11, thereby bonding the plastic outer layer 4 to the plastic core tube 1. Comparatively, the adhesive has a lower melting point, making it easier to heat and melt, and it has good fluidity, reducing the manufacturing difficulty of the composite tube; furthermore, the adhesive has good adhesion to both the plastic and the perforated steel strip. Placing the first adhesive layer 5 between the second perforated steel strip 7 and the plastic outer layer 4 can improve the connection strength.

[0063] Furthermore, the composite pipe provided by this utility model also includes a second adhesive layer bonded to the outer circumferential surface of the plastic core tube 1, and a first perforated steel strip 6 wound along a first spiral direction on the outer circumferential surface of the second adhesive layer. Placing the second adhesive layer between the plastic core tube 1 and the first perforated steel strip 6 can improve the connection strength between the two. Simultaneously, after the first adhesive layer 5 melts, it passes through the through hole 11 and bonds with the second adhesive layer, further improving the overall structural stability of the composite pipe.

[0064] A preferred embodiment of the perforated steel strip wound reinforced composite pipe of this utility model is described below with reference to the accompanying drawings.

[0065] Referring to Figures 1-9, the composite tube of this utility model includes: a plastic core tube 1, a second adhesive layer, a first perforated steel strip 6, a second perforated steel strip 7, a first adhesive layer 5, and a plastic outer layer 4, arranged sequentially from the inside out. The first perforated steel strip 6 is wound around the outer circumference of the second adhesive layer along a first spiral direction and at intervals. The second perforated steel strip 7 is wound around the radially outer side of the first perforated steel strip 6 along a second spiral direction and at intervals, forming a steel strip overlapping area 10. A first perforated area is provided on the first perforated steel strip 6, which is located in the middle of the first perforated steel strip 6. The width of the first perforated area does not exceed 2 / 3 of the width of the first perforated steel strip 6. Multiple first through holes 8 are provided on the first perforated area. The multiple first through holes 8 can be distributed in a single row or multiple rows. In the multiple first through holes 8 in the same row, the distance between any two adjacent first through holes 8 is not less than 3 mm. When the multiple first through holes 8 are distributed in multiple rows, the row spacing between any two adjacent rows of first through holes 8 is not less than 3 mm.

[0066] The second perforated steel strip 7 has a second perforated area located in the middle of the second perforated steel strip 7. The width of the second perforated area does not exceed 2 / 3 of the width of the second perforated steel strip 7. Multiple second through holes 9 are formed in the second perforated area. These multiple through holes 9 can be arranged in a single row or multiple rows. In the same row of multiple second through holes 9, the distance between any two adjacent second through holes 9 is not less than 3 mm. When multiple second through holes 9 are arranged in multiple rows, the row spacing between any two adjacent rows of second through holes 9 is not less than 3 mm. When the second perforated steel strip 7 is spirally wound around the radial outer side of the first perforated steel strip 6, in the central area of ​​the overlapping area 10, at least the second through holes 9 and the first through holes 8 at least partially overlap, forming through holes 11. At the same time, at least a portion of the first interval and the second interval overlap to form a through hole 11, and at least a portion of the first interval and the second through hole 9 and at least a portion of the first interval and the first through hole 8 respectively form through holes 11, so that through holes 11 are formed in the four corners, four sides and central area of ​​the steel strip overlapping area 10.

[0067] The first through hole 8 and the second through hole 9 are identical, preferably elongated holes, such as waist-shaped holes, rectangular holes, elongated polygonal holes, etc. The angle between the major axis of the first through hole 8 and the length direction of the first perforated steel strip 6 is the first perforation angle, which is neither equal to 0 nor 90°. The angle between the major axis of the second through hole 9 and the length direction of the second perforated steel strip 7 is the second perforation angle, which is neither equal to 0 nor 90°. The angle between the first helical direction and the axial direction of the plastic core tube 1 is the first helical angle, and the angle between the second helical direction and the axial direction of the plastic core tube 1 is the second helical angle. The first perforation angle and the second perforation angle are equal, and the first helical angle and the second helical angle are equal. The calculation relationship between the first perforation angle, the second perforation angle, the first helical angle, and the second helical angle satisfies:

[0068] α-10°≤β≤α+10°;

[0069] Wherein, α represents the first helix angle and the second helix angle;

[0070] β represents the first aperture angle and the second aperture angle.

[0071] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A perforated steel strip wound reinforced composite pipe, characterized in that, include: Plastic core tube (1); first perforated steel strip (6), the first perforated steel strip (6) is provided with a first perforated area, the first perforated area is provided with a plurality of first through holes (8), the first perforated steel strip (6) is wound around the radial outer side of the plastic core tube (1) along a first spiral direction; second perforated steel strip (7), the second perforated steel strip (7) is provided with a second perforated area, the second perforated area is provided with a plurality of second through holes (9), the second perforated steel strip (7) is wound along a second spiral direction opposite to the first spiral direction. On the radial outer side of the first perforated steel strip (6) and along the radial direction of the plastic core tube (1), the projected overlapping area of ​​the second perforated steel strip (7) and the first perforated steel strip (6) forms a steel strip overlapping area (10), at least a portion of the second through hole (9) can at least partially overlap with the first through hole (8) to form a through hole (11); and a plastic outer layer (4) is disposed on the radial outer side of the second perforated steel strip (7); wherein at least a portion of the through holes (11) are distributed on the steel strip. The central region of the overlapping area (10); the first through hole (8) has a major axis and a minor axis that are perpendicular to each other, the length of the major axis being greater than the length of the minor axis; the second through hole (9) has a major axis and a minor axis that are perpendicular to each other, the length of the major axis being greater than the length of the minor axis; the angle between the major axis of the first through hole (8) and the length direction of the first perforated steel strip (6) forms a first perforation angle, and the angle between the first helical direction and the axial direction of the plastic core tube (1) forms a first helical angle; the angle between the major axis of the second through hole (9) and the length direction of the second perforated steel strip (7) forms a second perforation angle, and the angle between the second helical direction and the axial direction of the plastic core tube (1) forms a second helical angle; the first perforation angle is equal to the second perforation angle, the first helical angle is equal to the second helical angle, and the calculation relationship between the first perforation angle, the second perforation angle, the first helical angle and the second helical angle satisfies: α-10°≤β≤α+10°; where α is the first helical angle and the second helical angle; β is the first perforation angle and the second perforation angle.

2. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, Along the length direction of the first perforated steel strip (6), the center line of the first perforated area coincides with the center line of the first perforated steel strip (6); along the length direction of the second perforated steel strip (7), the center line of the second perforated area coincides with the center line of the second perforated steel strip (7).

3. The perforated steel strip wound reinforced composite pipe according to claim 2, characterized in that, The width of the first perforated area does not exceed 2 / 3 of the width of the first perforated steel strip (6), and the width of the second perforated area does not exceed 2 / 3 of the width of the second perforated steel strip (7).

4. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, The major axis of the first through hole (8) is not parallel to the length and width directions of the first perforated steel strip (6); the major axis of the second through hole (9) is not parallel to the length and width directions of the second perforated steel strip (7).

5. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, Along the length direction of the first perforated steel strip (6), multiple rows of first through holes (8) are opened in the first perforated area; along the length direction of the second perforated steel strip (7), multiple rows of second through holes (9) are opened in the second perforated area.

6. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, Along the length of the first perforated steel strip (6), the distance between any two adjacent first through holes (8) is not less than 3mm; along the length of the second perforated steel strip (7), the distance between any two adjacent second through holes (9) is not less than 3mm.

7. The perforated steel strip wound reinforced composite pipe according to claim 6, characterized in that, Along the length direction of the first perforated steel strip (6), multiple rows of first through holes (8) are opened in the first perforated area, and the row spacing between any two adjacent rows of first through holes (8) is not less than 3mm; along the length direction of the second perforated steel strip (7), multiple rows of second through holes (9) are opened in the second perforated area, and the row spacing between any two adjacent rows of second through holes (9) is not less than 3mm.

8. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, The composite tube also includes a first adhesive layer (5) bonded to the radially outer side of the second perforated steel strip (7), and the plastic outer layer (4) bonded to the outer peripheral surface of the first adhesive layer (5).

9. The perforated steel strip wound reinforced composite pipe according to claim 1, characterized in that, The first through hole (8) and the second through hole (9) are identical to each other.

10. The perforated steel strip wound reinforced composite pipe according to any one of claims 1-9, characterized in that, The first perforated steel strip (6) is wound around the radial outside of the plastic core tube (1) along the first spiral direction and forms a first gap. The second perforated steel strip (7) is wound around the radial outside of the first perforated steel strip (6) along the second spiral direction and forms a second gap. At least part of the first gap and the second gap form the through hole (11).

11. The perforated steel strip wound reinforced composite pipe according to claim 10, characterized in that, At least a portion of the first through hole (8) and the second gap can form the through hole (11); and / or, at least a portion of the second through hole (9) and the first gap can form the through hole (11).

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