Integrated forming device for multi-support compression-resistant W-shaped steel strip reinforced corrugated pipe

Abstract

The utility model relates to the technical field of pipeline production, and particularly discloses an integral forming device of a multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe, which comprises an inner pipe extrusion molding part, an outer pipe extrusion molding part, an outer pipe extrusion molding part, an inner pipe extrusion molding part and a plurality of inner pipe extrusion molding parts, wherein the inner pipe extrusion molding part rotates along the axis of the inner pipe extrusion molding part; the outer coating layer extrusion molding part is coaxially arranged at the downstream end of the inner pipe extrusion molding part and is absolutely and fixedly mounted, so that the uniform thickness of the outer coating layer is effectively ensured, the problem of cracking of the surface layer in the later stage is avoided, meanwhile, a new adhesive layer can be formed on the lower layer of the steel belt through meshes of the steel belt, the adhesive layer adhesion area between the outer coating layer and the inner pipe is increased, and the adhesive force is improved; the problem of layering in use is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline production, in particular to an integrated forming device for a multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe. Background Art

[0002] Steel belt reinforced corrugated pipe is widely used in various fluid transportation fields, such as water supply, gas supply, sewage discharge, etc., due to its excellent anti-extrusion and anti-bending capabilities. However, since the steel belt is spirally wound to the outside of the inner tube at a later stage, the outer coating is not extruded integrally with the inner tube. In existing production, spraying is mostly used to add the outer coating. However, for W-shaped steel belts, there are many wrinkles on the surface. When spraying, the thickness of the wrinkle position will be uneven. Specifically, since the nozzle is a straight flat nozzle, that is, the spraying amount per unit distance along the axis of the pipeline is consistent, and for W-shaped steel belts, the wrinkle position and the surface area per unit distance along the axis of the pipeline fluctuate, which causes inconsistent spraying thickness in the wrinkle area, that is, the thickness of the wrinkle is thinner than that of the flat area. After the rubber shrinks or when the pipeline is bent at a later stage, cracks are likely to appear in the weak area, affecting the service life of the pipeline. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide an one-piece forming device for a multi-support, pressure-resistant W-shaped steel belt reinforced corrugated pipe. The integrated production equipment is adopted to effectively reduce the transportation and storage of intermediates in the production process, reduce manual intervention, and improve production efficiency. The outer coating is added in the form of extrusion, which effectively ensures the uniformity of the thickness of the outer coating and avoids cracking of the surface in the later stage. At the same time, a new adhesive layer can be formed on the lower layer of the steel belt through the mesh of the steel belt, thereby increasing the adhesion area of ​​the adhesive layer between the outer coating and the inner pipe, improving the adhesion, avoiding the problem of stratification during use, helping to improve the service life, and can effectively solve the problems in the background technology.

[0004] To achieve the above purpose, the utility model provides the following technical solutions: an integrated forming device for a multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe, comprising:

[0005] The inner tube extrusion part rotates along its own axis, and a synchronously rotating mandrel is arranged at the axis, and the mandrel extends to the outside of the workpiece outlet;

[0006] The outer covering layer extrusion part is coaxially arranged at the downstream end of the inner tube extrusion part and is absolutely fixedly installed;

[0007] The outer covering layer extrusion part includes, from front to back,

[0008] A steel strip shaping section with a spiral inner wall surface for steel strip shaping, an outer wall filling section with a cylindrical inner cavity, an outer wall extrusion section with a frustum-shaped inner cavity and an outer wall shaping section with a spiral inner wall surface for outer coating plasticity, the outer wall filling section is connected to a second injection port connected to an external injection molding machine.

[0009] As a preferred technical solution of the utility model, the inner tube extrusion part includes a fixed extrusion part and a relatively rotatable rotating extrusion head, the fixed extrusion part and the inner cavity of the rotating extrusion head are connected, and the fixed extrusion part is connected to a first injection port connected to an external injection molding machine; the rotating extrusion head includes, from front to back, an inner tube filling section with a cylindrical inner cavity, an inner tube extrusion section with a frustum-shaped inner cavity, and an inner tube shaping section with a cylindrical inner cavity;

[0010] The fixed extrusion part and the rotating extrusion head are separated, which is convenient for the arrangement of the position of the first injection port and the connection with the external injection molding machine. The rotating extrusion head can rotate synchronously with the core shaft, that is, the rotating extrusion head and the core shaft are relatively fixed, so that a synchronously rotating inner tube can be produced, which is convenient for the subsequent spiral winding of the steel strip.

[0011] After the steel strip is bent by the external steel strip forming machine, it is wrapped around the outside of the inner tube as the core shaft and the inner tube rotate. During the initial winding, in order to avoid scratching the pipe surface and there is a certain stress during the winding itself, a steel strip shaping section is designed to shape the steel strip and eliminate its internal stress to make it meet the winding requirements outside the inner tube. It enters the outer coating extrusion section together with the inner tube, contacts and adheres to the colloid in the outer wall filling section and the outer wall extrusion section, and is shaped in the outer wall shaping section until the production is completed.

[0012] As a preferred technical solution of the utility model, a plurality of groups of connecting columns for connecting the core shaft are arranged radially in the rubber-filled section of the inner tube, and the cross section of the connecting column is teardrop-shaped, and the large end of the teardrop-shaped column faces the upstream end; the side of the connecting column is provided with a teardrop-shaped diffusion hole penetrating therethrough, and the large end of the teardrop-shaped column faces the downstream end;

[0013] By setting a connecting column between the rotating extrusion head and the core shaft, the two can rotate synchronously, that is, relatively still, and the special cross-sectional design of the connecting column and the diffusion hole design in the middle are conducive to the agitation and mixing of the internal glue.

[0014] As a preferred technical solution of the utility model, the core shaft synchronously penetrates the inner tube extrusion part and the outer coating extrusion part, and the outside of the core shaft that is not inside the inner tube extrusion part is covered with a heat insulation layer;

[0015] The part of the mandrel located inside the inner tube extrusion section is made of metal and has good thermal conductivity, which ensures consistent inner wall temperature and a smooth inner wall surface of the main lifting pipe. The mandrel located outside it is made of polymer material with reduced thermal conductivity, which avoids temperature transfer along the axial direction of the mandrel and effectively reduces the central temperature drop in the inner tube extrusion section.

[0016] As a preferred technical solution of the utility model, a steel belt shaping part is coaxially fixedly arranged at the upstream end of the outer coating extrusion part, and a screw groove having the same screw pitch as the workpiece is arranged on the inner wall of the steel belt shaping part;

[0017] A steel belt shaping section having the same function as the steel belt shaping section is added at the front end of the outer covering layer extrusion section to pre-shape the steel belt, thereby reducing the load on the steel belt shaping section, reducing its wear and improving the sealing performance of the upstream end of the outer covering layer extrusion section.

[0018] As a preferred technical solution of the utility model, the outer covering layer extrusion part is a two-petal structure, and an arc-shaped protrusion is provided at the inner wall joint;

[0019] The two-petal design facilitates the repair and replacement of the extruded outer covering, while the addition of arc-shaped protrusions at the joints helps to improve the sealing of the joints.

[0020] As a preferred technical solution of the utility model, a cooling and shaping part and a drying part for cleaning and drying the inner tube are arranged between the inner tube extrusion part and the outer coating extrusion part. The cooling and shaping part is an annular structure, and atomizing nozzles facing the axial direction are evenly arranged inside;

[0021] Adding a cooling and shaping section at the downstream end of the inner tube extrusion section helps the inner tube to solidify quickly. Compared with the surface quality problems caused by spraying, the water mist produced by the atomizing nozzle is finer, has less impact on the surface quality of the outer surface of the inner tube, is easy to evaporate, can take away more heat, and accelerate the solidification of the inner tube.

[0022] As a preferred technical solution of the utility model, a workpiece support portion for supporting the workpiece is provided between the inner tube extrusion portion and the outer covering layer extrusion portion, and the workpiece support portion is a double-roller support structure. In order to avoid deformation of the inner tube due to insufficient hardness or insufficient curing time during the steel strip winding process, the length of the core shaft can be extended so that it passes through the outer covering layer extrusion portion. By adding the workpiece support portion, it helps to avoid deformation of the core shaft due to excessive length.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] Firstly, the integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe adopts the integrated forming method of inner tube extrusion, steel belt winding and outer covering layer extrusion, which does not require the intermediate conversion and storage. The whole production process can be automated without manual intervention, thus improving production efficiency.

[0025] Compared with the traditional production method, the outer covering layer is extruded, and the thickness of the covering layer in the wrinkle area is uniform, which is not easy to produce cracks in later use;

[0026] At the same time, when the steel belt adopts a mesh steel belt, the extruded outer coating has a larger extrusion pressure, and the adhesive can pass through the mesh of the steel belt and contact the inner tube on the lower surface of the steel belt. That is, there is a larger bonding area between the outer coating and the outer wall of the inner tube, so it has greater adhesion. During use, the probability of delamination is further reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the utility model;

[0028] Figure 2 This is the front view of the structure of the utility model;

[0029] Figure 3 It is a cross-sectional view of the utility model;

[0030] Figure 4 This is a cross-sectional view of the utility model taken along line AA;

[0031] Figure 5 This is a cross-sectional view of the utility model at BB;

[0032] Figure 6 This is a cross-sectional view of the utility model at CC;

[0033] Figure 7 It is a cross-sectional view of the utility model at DD.

[0034] In the figure: 1, inner tube extrusion section; 101, fixed extrusion section; 102, first glue injection port; 103, rotating extrusion head; 1031, inner tube glue filling section; 1032, inner tube extrusion section; 1033, inner tube shaping section; 1034, connecting column; 1035, diffusion hole;

[0035] 2. Extrusion section of outer covering layer; 201. Steel belt shaping section; 2011. Steel belt shaping section; 2012. Outer wall filling section; 2013. Outer wall extrusion section; 2014. Outer wall shaping section; 202. Second glue injection port;

[0036] 3. Mandrel; 4. Cooling and shaping section; 5. Drying section; 6. Workpiece supporting section. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] See also Figure 1-Figure 7 The utility model provides a technical solution: an integrated forming device for a multi-support, pressure-resistant W-shaped steel belt reinforced corrugated pipe. The device adopts integrated production equipment, which effectively reduces the transportation and storage of intermediates in the production process, reduces manual intervention, and improves production efficiency. The outer coating is added in the form of extrusion, which effectively ensures the uniform thickness of the outer coating and avoids cracking problems on the surface in the later stage. At the same time, it can form a new adhesive layer on the lower layer of the steel belt through the mesh of the steel belt, increase the adhesive layer adhesion area between the outer coating and the inner tube, improve adhesion, avoid stratification problems during use, and help to increase service life. It specifically includes:

[0039] The inner tube extrusion part 1 rotates along its own axis, and a synchronously rotating core shaft 3 is arranged at the axis, and the core shaft 3 extends to the outside of the workpiece outlet; the inner tube extrusion part 1 includes a fixed extrusion part 101 and a relatively rotatable rotating extrusion head 103, the fixed extrusion part 101 and the rotating extrusion head 103 are connected in the inner cavity, and the fixed extrusion part 101 is connected to the first injection port 102 connected to the external injection molding machine; the rotating extrusion head 103 includes, from front to back, the inner cavity is a column The inner tube glue filling section 1031 is shaped like a cone, the inner tube extrusion section 1032 is shaped like a cone, and the inner tube shaping section 1033 is shaped like a column; the fixed extrusion section 101 and the rotating extrusion head 103 are separated, which is convenient for arranging the position of the first injection port 102 and connecting with an external injection molding machine, and the rotating extrusion head 103 can rotate synchronously with the core shaft 3, that is, the rotating extrusion head 103 is relatively fixed with the core shaft 3, so that the synchronously rotating inner tube can be produced, which is convenient for the subsequent spiral winding of the steel strip;

[0040] See also Figure 4-Figure 6 Several groups of connecting columns 1034 for connecting the core shaft 3 are arranged radially in the inner tube glue-filled section 1031. The cross section of the connecting column 1034 is in a water drop shape, and the large end of the water drop shape faces the upstream end; the side of the connecting column 1034 is provided with a penetrating water drop-shaped diffusion hole 1035, and the large end of the water drop shape faces the downstream end;

[0041] By setting a connecting column 1034 between the rotating extrusion head 103 and the core shaft 3, the two can rotate synchronously, that is, they are relatively stationary, and the special cross-sectional design of the connecting column 1034 and the design of the diffusion hole 1035 in the middle are helpful to stir and mix the internal glue, thereby avoiding the deterioration of extrusion quality caused by the radial temperature difference inside the glue.

[0042] The outer covering layer extrusion part 2 is coaxially arranged at the downstream end of the inner tube extrusion part 1 and is absolutely fixedly installed; the outer covering layer extrusion part 2 includes, from front to back,

[0043] The steel strip shaping section 2011 has a spiral inner wall surface and is used for steel strip shaping, the outer wall filling section 2012 has a cylindrical inner cavity, the outer wall extrusion section 2013 has a conical inner cavity and the outer wall shaping section 2014 has a spiral inner wall surface and is used for outer coating plasticity, and the outer wall filling section 2012 is connected to a second injection port 202 connected to an external injection molding machine.

[0044] The core shaft 3 simultaneously penetrates the inner tube extrusion part 1 and the outer coating extrusion part 2, and the outer part of the core shaft 3 which is not inside the inner tube extrusion part 1 is covered with a heat insulation layer;

[0045] The part of the core shaft 3 located inside the inner tube extrusion part 1 is made of metal material and has good thermal conductivity, which ensures the consistency of the inner wall temperature and helps to improve the smoothness of the inner wall surface of the pipeline. The core shaft 3 located outside it is made of polymer material with reduced thermal conductivity, which avoids the temperature from being transferred axially along the core shaft 3, and effectively reduces the central temperature drop in the inner tube extrusion part 1.

[0046] See also Figure 1-Figure 3 A steel belt shaping portion 201 is coaxially fixedly disposed at the upstream end of the outer coating extrusion portion 2, and a screw groove having the same screw pitch as the workpiece is disposed on the inner wall of the steel belt shaping portion 201;

[0047] A steel belt shaping section 201 having the same function as the steel belt shaping section 2011 is added at the front end of the outer coating extrusion section 2 to pre-shape the steel belt, thereby reducing the load on the steel belt shaping section 2011, reducing its wear, and improving the sealing performance of the upstream end of the outer coating extrusion section 2.

[0048] See also Figure 7 The outer covering extrusion part 2 is a two-petal structure, and an arc-shaped protrusion is provided at the inner wall joint; the two-petal design facilitates the maintenance and replacement of the outer covering extrusion part 2, and at the same time, adding an arc-shaped protrusion at the joint helps to improve the sealing of the joint.

[0049] See also Figure 1-Figure 3 A cooling and shaping section 4 and a drying section 5 for cleaning and drying the inner tube are arranged between the inner tube extrusion section 1 and the outer coating extrusion section 2. The cooling and shaping section 4 is an annular structure, and atomizing nozzles facing the axial direction are evenly arranged inside;

[0050] Adding a cooling and shaping section 4 at the downstream end of the inner tube extrusion section 1 helps the inner tube to solidify quickly. Compared with the surface quality problems caused by spraying, the water mist produced by the atomizing nozzle is finer, has less impact on the surface quality of the outer surface of the inner tube, is easy to evaporate, can take away more heat, and accelerate the solidification of the inner tube.

[0051] A workpiece support portion 6 for supporting the workpiece is provided between the inner tube extrusion portion 1 and the outer covering layer extrusion portion 2. The workpiece support portion 6 is a double-roller support structure. In order to avoid deformation of the inner tube due to insufficient hardness or insufficient curing time during the steel strip winding process, the length of the core shaft 3 can be extended so that it passes through the outer covering layer extrusion portion 2. By adding the workpiece support portion 6, it helps to avoid deformation of the core shaft 3 due to its excessive length.

[0052] When using:

[0053] The external injection molding machine introduces the rubber material into the inner tube extrusion part 1 through the first injection port 102 for inner tube extrusion. During the extrusion process, the inner tube rotates synchronously with the core shaft 3 and the inner tube extrusion part 1. After cooling and molding, subsequent steel strip winding and outer coating extrusion are carried out.

[0054] After the steel strip is bent by the external steel strip forming machine, it is wrapped around the outside of the inner tube as the core shaft 3 and the inner tube rotate. During the initial winding, in order to avoid scratching the pipe surface and there is a certain stress during the winding itself, a steel strip shaping section 2011 is designed to shape the steel strip and eliminate its internal stress so that it meets the winding requirements outside the inner tube. It enters the outer coating extrusion section 2 together with the inner tube, contacts and adheres to the colloid in the outer wall filling section 2012 and the outer wall extrusion section 2013, and is shaped in the outer wall shaping section 2014 until the production is completed.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated forming device for a multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe, characterized in that: include, The inner tube extrusion part (1) rotates along its own axis, and a synchronously rotating core shaft (3) is arranged at the axis, and the core shaft (3) extends to the outside of the workpiece outlet; The outer coating extrusion part (2) is coaxially arranged at the downstream end of the inner tube extrusion part (1) and is absolutely fixedly installed; The outer covering layer extrusion part (2) comprises, from front to back, A steel strip shaping section (2011) whose inner wall surface is a spiral surface and is used for shaping the steel strip, an outer wall glue filling section (2012) whose inner cavity is a columnar shape, an outer wall extrusion section (2013) whose inner cavity is a frustum-shaped shape, and an outer wall shaping section (2014) whose inner wall surface is a spiral surface and is used for plasticity of the outer coating, wherein the outer wall glue filling section (2012) is connected to a second glue injection port (202) connected to an external injection molding machine.

2. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1 is characterized in that: The inner tube extrusion section (1) comprises a fixed extrusion section (101) which is fixedly installed and a rotating extrusion head (103) which is relatively rotatably installed; the inner cavities of the fixed extrusion section (101) and the rotating extrusion head (103) are connected; the fixed extrusion section (101) is connected to a first injection port (102) which is connected to an external injection molding machine; the rotating extrusion head (103) comprises, from front to back, an inner tube glue filling section (1031) whose inner cavity is a columnar shape, an inner tube extrusion section (1032) whose inner cavity is a frustum-shaped shape, and an inner tube shaping section (1033) whose inner cavity is a columnar shape.

3. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 2 is characterized in that: A plurality of groups of connecting columns (1034) for connecting the core shaft (3) are radially arranged inside the inner tube glue-filled section (1031); the cross section of the connecting column (1034) is teardrop-shaped, with the large end of the teardrop-shaped column facing the upstream end; and a teardrop-shaped diffusion hole (1035) is provided on the side of the connecting column (1034), with the large end of the teardrop-shaped column facing the downstream end.

4. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1 is characterized in that: The core shaft (3) simultaneously penetrates the inner tube extrusion part (1) and the outer coating extrusion part (2), and the outside of the core shaft (3) that is not inside the inner tube extrusion part (1) is covered with a heat insulation layer.

5. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1 is characterized in that: A steel belt shaping portion (201) is coaxially fixedly arranged at the upstream end of the outer coating extrusion portion (2), and a screw groove having the same screw pitch as the workpiece is arranged on the inner wall of the steel belt shaping portion (201).

6. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1, characterized in that: The outer coating extrusion part (2) is a two-petal structure, and an arc-shaped protrusion is arranged at the inner wall joint.

7. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1 is characterized in that: A cooling and shaping section (4) and a drying section (5) for cleaning and drying the inner tube are arranged between the inner tube extrusion section (1) and the outer coating extrusion section (2); the cooling and shaping section (4) is an annular structure, and atomizing nozzles facing the axial direction are evenly arranged inside.

8. The integrated forming device of the multi-support compression-resistant W-shaped steel belt reinforced corrugated pipe according to claim 1 is characterized in that: A workpiece support portion (6) for supporting a workpiece is provided between the inner tube extrusion portion (1) and the outer coating layer extrusion portion (2); the workpiece support portion (6) is a double-roller support structure.

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