Double-wall corrugated pipe expansion module and expansion method

Abstract

The present invention discloses a double-wall corrugated pipe expansion module, including a molding module and a rolling mechanism, wherein the molding module includes a first die sleeve for forming the corrugation of the pipe wall, and a second die sleeve for forming the expansion portion, wherein the rolling mechanism includes a positioning sleeve, wherein the positioning sleeve is rotatably connected to a roller inside, wherein the positioning sleeve is fixedly installed in an extruder head, wherein a driving mechanism for driving the roller to rotate is installed in the extruder head, wherein an angle-adjustable pre-pressing plate is installed at the end of the roller, wherein the end face of the roller is rotatably connected to an adjustment shaft that passes through the left and right sides, wherein the adjustment shaft deviates from the axis of the roller, and wherein one end of the adjustment shaft is fixedly connected to the pre-pressing plate. The rolling mechanism proposed in the present invention utilizes the pre-pressing plate to make a circular motion in the corrugated pipe forming mold, and performs pressurized expansion forming on the inner wall of the corrugated pipe to form an expansion, so that the corrugation forming process realizes the expansion forming simultaneously, and the finished corrugated pipe can be obtained by subsequent cutting, thereby eliminating the process of separate expansion, and greatly improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated pipes, and in particular to a double-wall corrugated pipe expansion module and an expansion method. Background Art

[0002] HDPE double-wall corrugated pipe is made of high-density polyethylene as the main raw material, and is extruded at one time by internal and external extruders respectively. The inner wall of the double-wall corrugated pipe is smooth, the outer wall is trapezoidal corrugated, and there is a hollow layer of sandwich wall between the inner and outer walls. The product has many advantages such as large ring stiffness, high strength, light weight, sound insulation and shock absorption, high UV resistance, long service life, good flexibility, high pressure resistance and impact resistance.

[0003] The pipe production goes through a corrugated pipe forming process, followed by a cutting process, and finally a expanding process. The cut pipe is fed into a expanding machine, and after rotation and heating, an expansion is formed at the end of the pipe. This production method has a long process, and it is impossible to expand the pipe simultaneously during the forming process. The production efficiency needs to be improved. For this reason, the present application proposes a double-wall corrugated pipe expanding module and a expanding method. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a double-wall corrugated pipe expansion module and an expansion method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A double-wall corrugated pipe expansion module comprises a molding module and a rolling mechanism, wherein the molding module comprises a first mold sleeve for molding the pipe wall corrugations and a second mold sleeve for molding the expansion portion, wherein the rolling mechanism comprises a positioning sleeve, wherein a roller is rotatably connected to the interior of the positioning sleeve, and the positioning sleeve is fixedly installed in an extruder head, wherein a driving mechanism for driving the roller to rotate is installed in the extruder head, and a pre-compression plate with an adjustable angle is installed at the end of the roller.

[0007] Preferably, the end surface of the drum is rotatably connected with an adjustment shaft passing through left and right, the adjustment shaft deviates from the axis of the drum, one end of the adjustment shaft is fixedly connected to the pre-pressure plate, and the other end of the adjustment shaft is fixedly connected to a gear.

[0008] Preferably, the end surface of the drum is rotatably connected to a switching rotating disk, the surface of the switching rotating disk is provided with an arc-shaped notch, a tooth groove is arranged in the notch, and the gear is placed in the notch and meshes with the tooth groove in the notch.

[0009] Preferably, the driving mechanism includes a transmission shaft and a servo motor. The transmission shaft is rotatably installed in the extruder head, and the end of the transmission shaft is fixedly connected to the end surface of the switching rotating disk. The servo motor is fixedly installed outside the extruder head and drives the switching rotating disk to rotate in forward and reverse directions through the transmission shaft.

[0010] Preferably, the first mold sleeve and the second mold sleeve are both two semicircular structures, the inner wall of the first mold sleeve is provided with an arc-shaped groove that matches the corrugated protrusion on the outside of the bellows, the inner wall of the second mold sleeve has a smooth transition, and the inner walls of the first mold sleeve and the second mold sleeve are both provided with vacuum grooves.

[0011] The present invention has the following beneficial effects:

[0012] 1. The rolling mechanism proposed in the present invention utilizes a pre-pressing plate to make a circular motion in a bellows forming mold to pressurize and expand the inner wall of the bellows to form a flared mouth, so that the bellows forming process can realize the flared mouth forming simultaneously, and the finished bellows can be obtained by subsequent cutting, eliminating the process of separate flaring, thereby greatly improving production efficiency.

[0013] 2. The rolling mechanism proposed in the present invention switches the rotating disk to rotate forward or reverse, which is convenient for controlling the pre-pressing plate to maintain two swinging angles, so that the pre-pressing plate can not only roll the inner wall of the expanded mouth, but also roll the inner wall of the corrugated section, so that the adhesion of the inner and outer wall layers is more firm, and stratification is prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the front section of the structure proposed by the present invention;

[0015] Figure 2 A schematic side view of the structural switching rotating disk proposed in the present invention;

[0016] Figure 3 This is a schematic diagram of the pre-compression plate provided by the present invention being at a first fixed angle;

[0017] Figure 4 This is a schematic diagram of the pre-pressing plate provided by the present invention being at a second fixed angle;

[0018] Figure 5 This is a schematic diagram of the storage state of the pre-compression plate proposed by the present invention.

[0019] In the figure: 1 first die sleeve, 2 second die sleeve, 3 positioning sleeve, 4 roller, 5 extruder head, 6 pre-pressing plate, 7 adjusting shaft, 8 gear, 9 switching rotating plate, 10 notch, 11 transmission shaft, 12 servo motor, 13 vacuum groove, 14 pipe corrugated section, 15 pipe expansion part, 16 motion trajectory of the forming die. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] HDPE double-wall corrugated pipe is made of high-density polyethylene as the main raw material. The equipment used to produce this double-wall corrugated pipe includes an extruder and a molding machine. The extruder head extrude the inner and outer walls of the corrugated pipe, and the inner and outer walls of the corrugated pipe are shaped by the molding machine. The main component of the molding machine is the molding module. The molding module can be used to produce corrugated pipes of different shapes. According to the assembly method of the molding module, it can be divided into two types: vertical and horizontal (horizontal);

[0023] The vertical molding device allows the modules to be opened and closed up and down, and has a small footprint and compact structure, but it is difficult to replace modules, especially large-diameter modules; the horizontal (also called horizontal) molding device allows the modules to be opened and closed horizontally (usually only large-diameter molding equipment), and has a larger footprint, but it is more convenient to replace modules than the vertical type, and a cooling water circulation channel is designed in the module, using water as the cooling medium, which greatly improves the production speed.

[0024] According to the shaping method, it can be divided into two types: air pressure shaping and vacuum shaping;

[0025] At present, some manufacturers use air pressure shaping equipment, that is, compressed air is added to the inner cavity of the outer tube blank through the ribs on the die core support and the screw plug fixed on the die core, so that the tube blank is tightly attached to the module to form a wave peak. The products produced by this equipment can be of any cross-section, and can also improve the quality of the corrugated pipe and reduce the thickness error in the width of the concave and convex corrugations.

[0026] The above is the prior art and will not be described in detail herein.

[0027] Reference Figure 1-5 A double-wall corrugated pipe expansion module includes a molding module and a rolling mechanism. The molding module includes a first mold sleeve 1 for molding the pipe wall corrugation and a second mold sleeve 2 for molding the expansion portion. The rolling mechanism includes a positioning sleeve 3. The positioning sleeve 3 is rotatably connected to a roller 4. The positioning sleeve 3 is fixedly installed in an extruder head 5. A driving mechanism for driving the roller 4 to rotate is installed in the extruder head 5. A pre-pressing plate 6 with an adjustable angle is installed at the end of the roller 4.

[0028] The end surface of the drum 4 is rotatably connected with an adjusting shaft 7 which passes through the left and right sides. The adjusting shaft 7 deviates from the axial center line of the drum 4. One end of the adjusting shaft 7 is fixedly connected to the pre-pressure plate 6. The other end of the adjusting shaft 7 is fixedly connected with a gear 8. The end surface of the drum 4 is rotatably connected with a switching rotating disk 9. The surface of the switching rotating disk 9 is provided with an arc-shaped notch 10, and a tooth groove is provided in the notch 10. The gear 8 is placed in the notch 10 and meshes with the tooth groove in the notch 10.

[0029] The driving mechanism includes a transmission shaft 11 and a servo motor 12. The transmission shaft 11 is rotatably installed in the extruder head 5. The end of the transmission shaft 11 is fixedly connected to the end face of the switching rotating disk 9. The servo motor 12 is fixedly installed outside the extruder head 5 and drives the switching rotating disk 9 to rotate in positive and negative directions through the transmission shaft 11. The switching rotating disk 9 rotates forward or reversely, which is convenient for controlling the pre-pressing plate 6 to maintain two swinging angles, so that the pre-pressing plate 6 can not only roll the inner wall of the flared mouth, but also roll the inner wall of the corrugated section, so that the adhesion of the inner and outer wall layers is more firm, and stratification is prevented.

[0030] In this embodiment, the first mold sleeve 1 and the second mold sleeve 2 are both two semicircular structures. The inner wall of the first mold sleeve 1 is provided with an arc-shaped groove that matches the corrugated protrusion on the outside of the corrugated tube. The inner wall of the second mold sleeve 2 has a smooth transition, and the inner walls of the first mold sleeve 1 and the second mold sleeve 2 are both provided with a vacuum groove 13. The first mold sleeve 1 is wrapped around the outer wall of the corrugated section 14 of the pipe, and the second mold sleeve 2 is wrapped around the outer wall of the expanded portion 15 of the pipe.

[0031] This embodiment also proposes a method for expanding a double-wall corrugated pipe expansion module, including the following specific steps:

[0032] S1, feeding the material to the extruder, heating and plasticizing the extruder, and splitting the extruder head to extrude the inner wall layer and the outer wall layer of the corrugated tube respectively;

[0033] S2, forming the corrugated section of the pipe, the outer wall layer is inflated by compressed air in the first die set and the sizing set, the vacuum groove of the first die set creates negative pressure, adsorbs the outer wall layer, and the outer wall layer is shaped into a corrugated shape, and the inner wall layer and the outer wall layer are hot-melt-bonded and shaped;

[0034] S3, the pre-pressing of step S2, the transmission shaft drives the switching rotating disk to rotate in the positive direction, and in the early stage of starting, the gear rotates in the slot and moves to one end of the slot, so that the pre-pressing disk rotates and maintains the first fixed angle, refer to Figure 3 , switch the rotation and continue to rotate, driving the pre-pressing plate to do circular motion, the pre-pressing plate squeezes the inner wall of the inner wall layer, and presses the inner wall layer and the outer wall layer of the corrugated section of the pipe;

[0035] S4, forming the expanded end of the pipe, continuing step S2, and at the same time, interrupting the blowing of compressed air;

[0036] S5, the pre-pressing of step S4, the transmission shaft drives the switching rotating disk to rotate in the opposite direction, and in the early stage of starting, the gear rotates in the slot and moves to the other end of the slot, so that the pre-pressing disk rotates and maintains the second fixed angle, refer to Figure 4 , switch the rotation and continue to rotate, driving the pre-pressing plate to make a circular motion, the pre-pressing plate squeezes the inner wall of the inner wall layer, and presses the inner wall layer and the outer wall layer of the expanded end of the pipe;

[0037] S6. Cutting: After the pipe is demoulded, it is cooled and cut off by rotating at the edge of the expanded end of the pipe using a cutting machine.

[0038] The rolling mechanism proposed in the present invention utilizes the pre-pressing plate 6 to make circular motion in the corrugated tube forming mold to pressurize and expand the inner wall of the corrugated tube to form a flared mouth, so that the corrugated tube forming process can realize the flared mouth forming simultaneously, and the finished corrugated tube can be obtained by subsequent cutting, eliminating the separate flaring process and greatly improving production efficiency.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-wall corrugated pipe expansion module, characterized in that: The invention comprises a forming module and a rolling mechanism, wherein the forming module comprises a first die sleeve (1) for forming the corrugation of the tube wall, and a second die sleeve (2) for forming the flaring portion, wherein the rolling mechanism comprises a positioning sleeve (3), wherein the positioning sleeve (3) is rotatably connected to a roller (4) inside, wherein the positioning sleeve (3) is fixedly installed in an extruder head (5), wherein a driving mechanism for driving the roller (4) to rotate is installed in the extruder head (5), wherein an angle-adjustable pre-pressing plate (6) is installed at the end of the roller (4); wherein the end surface of the roller (4) is rotatably connected to an adjusting shaft (7) passing through the left and right sides, wherein the adjusting shaft (7) deviates from the axis of the roller (4), wherein one end of the adjusting shaft (7) is fixedly connected to the pre-pressing plate (6), and the other end of the adjusting shaft (7) is fixedly connected to a gear (8); wherein the end surface of the roller (4) is rotatably connected to a switching rotating plate (9), wherein the surface of the switching rotating plate (9) is An arc-shaped notch (10) is provided, and a tooth groove is provided in the notch (10). The gear (8) is placed in the notch (10) and meshes with the tooth groove in the notch (10). The driving mechanism comprises a transmission shaft (11) and a servo motor (12). The transmission shaft (11) is rotatably mounted in the extruder head (5). The end of the transmission shaft (11) is fixedly connected to the end surface of the switching rotating disk (9). The servo motor (12) is fixedly mounted outside the extruder head (5) and drives the switching rotating disk (9) to rotate in positive and negative directions through the transmission shaft (11). The first die sleeve (1) and the second die sleeve (2) are both semicircular structures. The inner wall of the first die sleeve (1) is provided with an arc-shaped groove that matches the corrugated protrusion on the outer side of the bellows. The inner wall of the second die sleeve (2) has a smooth transition. The inner walls of the first die sleeve (1) and the second die sleeve (2) are both provided with vacuum grooves (13).

2. The method for expanding a double-wall corrugated pipe expansion module according to claim 1, characterized in that: The specific steps include: S1, feeding the material to the extruder, heating and plasticizing the extruder, and splitting the extruder head to extrude the inner wall layer and the outer wall layer of the corrugated tube respectively; S2, forming the corrugated section of the pipe, the outer wall layer is inflated by compressed air in the first die set and the sizing set, the vacuum groove of the first die set creates negative pressure, adsorbs the outer wall layer, and the outer wall layer is shaped into a corrugated shape, and the inner wall layer and the outer wall layer are hot-melt-bonded and shaped; S3, the pre-pressing of step S2, the transmission shaft drives the switching rotating disk to rotate in the positive direction, in the early stage of starting, the gear rotates in the slot and moves to one end of the slot, so that the pre-pressing disk rotates and maintains the first fixed angle, the switching rotation continues to rotate, driving the pre-pressing disk to make a circular motion, the pre-pressing disk squeezes the inner wall of the inner wall layer, and presses the inner wall layer and the outer wall layer of the corrugated section of the pipe; S4, forming the expanded end of the pipe, continuing step S2, and at the same time, interrupting the blowing of compressed air; S5, the pre-pressing of step S4, the transmission shaft drives the switching rotating disk to rotate in the opposite direction, in the early stage of starting, the gear rotates in the slot and moves to the other end of the slot, so that the pre-pressing disk rotates and maintains the second fixed angle, the switching rotation continues to rotate, driving the pre-pressing disk to make a circular motion, the pre-pressing disk squeezes the inner wall of the inner wall layer, and presses the inner wall layer and the outer wall layer of the expanded end of the pipe; S6. Cutting: After the pipe is demoulded, it is cooled and cut off by rotating at the edge of the expanded end of the pipe using a cutting machine.

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