Double-wall corrugated pipe extrusion die
By designing a rotatable inner core assembly, adjusting the width of the inner layer flow path of the double-wall corrugated pipe, the problem of inability to adjust the inner layer thickness in the prior art is solved, dimensional accuracy is improved and equipment costs are reduced.
Patent Information
- Application Number
- CN202421487735.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-27
AI Technical Summary
In the prior art, the double-wall corrugated pipe extrusion outlet die cannot adjust the inner layer thickness, resulting in a decrease in dimensional accuracy after production. Pipes with different inner layer thicknesses require different extrusion outlet dies, resulting in higher equipment costs.
A double-wall corrugated pipe extrusion outlet die is designed, including a central shaft, an inner core assembly, an intermediate core and an outer core. By rotating the inner core assembly, the position of the first inclined part is adjusted and the port width of the second inner flow channel is changed, thereby realizing the adjustment of the inner wall thickness.
It realizes flexible adjustment of the inner thickness of the double-wall corrugated pipe, improves the dimensional accuracy of the pipe and reduces equipment costs.
Smart Images
Figure CN222858703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of extrusion molding, and more specifically to an extrusion die for a double-wall corrugated pipe. Background Art
[0002] Double-wall corrugated pipe is a pipe with a special structure, and its surface is corrugated. It is usually composed of two layers: inner layer and outer layer. The inner layer is usually a smooth pipe wall, while the outer layer is a corrugated structure. This design makes the double-wall corrugated pipe have a certain flexibility and pressure resistance, while maintaining the flow properties of the fluid inside the pipe. The wall thickness of the inner and outer layers of the double-wall corrugated pipe has an important influence on its performance and application. The wall thickness of the outer layer directly affects the strength and rigidity of the entire pipe, while the wall thickness of the inner layer affects the corrosion resistance, wear resistance and fluid transport resistance inside the pipe. Therefore, when producing double-wall corrugated pipes, it is necessary to comprehensively consider the wall thickness of the inner and outer layers to meet specific engineering requirements and application scenarios, while achieving a balance in terms of performance, cost and service life.
[0003] In the production process of double-wall corrugated pipes, the raw material particles are transported to the extruder, heated, melted and mixed inside the extruder to form a uniform plastic melt, which is then pressed into the extrusion die, extruded and formed through high pressure, and then enters the shaping device to form the appearance of the double-wall corrugated pipe. The outer layer presents a corrugated structure and the inner layer is a smooth pipe wall.
[0004] The prior art discloses an energy-saving and efficient cooling double-wall corrugated pipe extrusion die head, comprising an inner die body and an outer die body, the inner die body comprising an inner core die and an inner die sleeve, an inner cavity is formed between the inner core die and the inner die sleeve, the outer die body comprising an outer core die, an outer die sleeve, an outer cavity is formed between the outer core die and the outer die sleeve, the inner core die is coaxially connected to an inner core rod, an insulation pad and a positioning pressure plate are installed on the end face of the inner core rod, the positioning pressure plate contacts the insulation pad to press and fix the insulation pad.
[0005] In the above technical solution, firstly, after a long period of production, the inner core mold and the inner mold sleeve will be worn due to the friction of the molten material, causing the distance between the inner core mold and the inner mold sleeve to increase, resulting in an increase in the inner thickness of the double-walled corrugated pipe, thereby affecting the dimensional accuracy of the double-walled corrugated pipe. Secondly, since the inner thickness requirements of the double-walled corrugated pipe in different usage scenarios are different, different extrusion dies are required to achieve the production of double-walled corrugated pipes with different inner thicknesses, resulting in higher equipment costs. Utility Model Content
[0006] In view of the problem that the extrusion die in the above-mentioned prior art cannot adjust the inner layer thickness of the double-wall corrugated pipe, the dimensional accuracy of the double-wall corrugated pipe will be reduced after long-term production, and double-wall corrugated pipes with different inner layer thicknesses require different extrusion dies for production, resulting in high equipment costs, the utility model provides a double-wall corrugated pipe extrusion die, which can adjust the inner layer thickness of the double-wall corrugated pipe, improve the dimensional accuracy of the double-wall corrugated pipe, and reduce equipment costs.
[0007] In order to solve the above technical problems, the technical solution provided by the utility model is:
[0008] A double-wall corrugated pipe extrusion die comprises a central shaft, an inner core mold assembly, an intermediate core mold and an outer core mold; the inner core mold assembly is connected to the central shaft, and a first inclined portion is provided on the inner core mold assembly; a second inclined portion is provided at the end of the intermediate core mold; a third inclined portion is provided at the end of the outer core mold; a first inner layer flow channel is formed between the central shaft and the intermediate core mold, a second inner layer flow channel connected to the first inner layer flow channel is formed between the first inclined portion and the second inclined portion; a first outer layer flow channel is formed between the intermediate core mold and the outer core mold, a second outer layer flow channel connected to the first outer layer flow channel is formed between the second inclined portion and the third inclined portion; specifically, the inner core mold assembly is sleeved outside the central shaft and is threadedly connected to the central shaft.
[0009] It can be understood that the central axis, the middle mold core and the outer mold core are all used to connect to the extruder. During the extrusion molding process, the inner layer raw material flows into the second inner layer flow channel through the first inner layer flow channel, and then flows out through the port of the second inner layer flow channel, thereby forming the inner layer of the double-wall corrugated pipe; the outer layer raw material flows into the second outer layer flow channel through the first outer layer flow channel, and then flows out through the port of the second outer layer flow channel, thereby forming the outer layer of the double-wall corrugated pipe.
[0010] In the above technical solution, when it is necessary to adjust the inner wall thickness of the double-wall corrugated pipe, the inner core mold assembly is rotated to move the first inclined portion along the axial direction of the center axis. When the first inclined portion moves, the gap between it and the second inclined portion changes, and the port width of the second inner layer flow channel also changes accordingly, thereby extruding layer structures of different thicknesses to achieve adjustment of the wall thickness of the inner layer of the double-wall corrugated pipe.
[0011] Preferably, a shaft neck is provided at the end of the central shaft; the inner core assembly includes a rotating ring, a rolling bearing and a moving core ring; the rotating ring is sleeved on the outside of the shaft neck and is threadedly connected to the shaft neck; the rolling bearing is sleeved on the outside of the rotating ring and the inner ring of the rolling bearing is connected to the moving core ring; the moving core ring is sleeved on the outside of the outer ring of the rolling bearing and is connected to the outer ring of the rolling bearing; the first inclined portion is provided on the moving core ring. When the rotating ring is rotated, the inner ring of the rolling bearing rotates together with the rotating ring and moves along the axis direction of the central shaft together with the rotating ring; the outer ring of the rolling bearing moves along the axis direction of the central shaft together with its inner ring, thereby driving the moving core ring to move along the axis direction of the central shaft. In other words, in the process of rotating the rotating ring, the moving core ring does not rotate with the rotation of the rotating ring. First, during the extrusion molding process, the second inner flow channel is filled with molten material. Since these molten materials have high viscosity, it is necessary to overcome large friction and torque to rotate the entire inner core assembly, and continuous and uniform force is required to keep the entire inner core assembly rotating, which is more difficult to operate. Secondly, the rotation of the entire inner core assembly will cause a complex flow pattern of the molten material, including shear effect and eddy effect, which will increase the flow resistance of the molten material and make the flow of the molten material uneven, thus affecting the inner layer quality of the double-wall corrugated pipe. After the rotating ring, rolling bearing and moving core ring are set, since the inner ring of the rolling bearing can rotate relative to its outer ring, the rotation of the rotating ring will not drive the moving core ring to rotate. When the rotating ring is rotated, the moving core ring keeps moving in a straight line. Since the linear movement of the moving core ring is a single-direction force, it is easier to control and apply, the rotation control of the rotating ring is easier, and it can also avoid the movement of the core ring rotating and affecting the flow of the molten material.
[0012] Preferably, a guide groove is provided on the outer circumferential surface of the central shaft, and a sliding protrusion is provided on the inner circumferential surface of the movable core ring, and the sliding protrusion is slidably connected with the guide groove along the axial direction of the central shaft. The guide groove guides the sliding protrusion, so that the movable core ring keeps moving in the axial direction of the central shaft, and does not rotate due to other external forces, so that the rotation of the movable core ring can be prevented from affecting the flow of the molten material in the second inner layer flow channel.
[0013] Preferably, the guide grooves are provided in plurality and are distributed in a circle with the axis of the central axis as the array axis, and the sliding protrusions are also provided in plurality and are slidably connected with the guide grooves in a one-to-one correspondence. Providing a plurality of guide grooves and a plurality of sliding protrusions can make the force on the moving core ring more uniform, thereby maintaining a more stable state during movement.
[0014] Among them, the connection method between the rotating ring and the inner ring of the rolling bearing can be bonding, welding, clamping, interference fit or connected through various connecting parts; the connection method between the moving core ring and the outer ring of the rolling bearing can also be bonding, welding, clamping, interference fit or connected through various connecting parts.
[0015] Preferably, the outer circumferential surface of the rotating ring is interference fit with the inner ring of the rolling bearing, so that the rotating ring and the inner ring of the rolling bearing remain relatively fixed; the outer circumferential surface of the moving core ring is interference fit with the outer ring of the rolling bearing, so that the moving core ring and the outer ring of the rolling bearing remain relatively fixed. The interference fit method is simpler than other connection methods.
[0016] Preferably, a first push structure is provided at one end of the rotating ring, and a second push structure is provided at the other end, and the inner ring of the rolling bearing is located between the first push structure and the second push structure; a third push structure is connected to the end of the moving core ring, and the outer ring of the rolling bearing is located between the sliding protrusion and the third push structure. It can be understood that the first push structure and the second push structure can prevent the rolling bearing from detaching from the rotating ring. When the width of the second inner layer flow channel needs to be adjusted, during the process of rotating the rotating ring, the first push structure and the second push structure can respectively push the inner ring of the rolling bearing, thereby reducing the risk of relative movement between the rotating ring and the inner ring of the rolling bearing in the axial direction. In the process of the moving core ring moving left and right along the direction of the central axis, the sliding protrusion and the third push structure can respectively push the outer ring of the rolling bearing, thereby reducing the risk of relative movement between the moving core ring and the outer ring of the rolling bearing in the axial direction. The first push structure, the second push structure and the third push structure can make the moving distance adjustment of the moving core ring more reliable.
[0017] Preferably, a force-applying blind hole is provided at the end of the second pushing structure or the rotating ring. After the force-applying blind hole is provided, the staff can insert a rod-shaped structure into the force-applying blind hole, and drive the rotating ring or the second pushing structure to rotate by driving the rod-shaped structure. The force-applying blind hole is provided to facilitate driving the rotating ring to rotate.
[0018] Preferably, a blowing channel is provided on the middle mold core, and the blowing channel extends from one end to the other end of the middle mold core, and the ports of the blowing channel, the ports of the inner layer flow channel, and the ports of the outer layer flow channel are aligned in the axial direction of the central axis. The blowing channel can be connected to an external air source, and during the process of simultaneously extruding the molten material from the second inner layer flow channel and the second outer layer flow channel, air can be blown through the blowing port, so that the molten material flowing out of the second inner layer flow channel and the molten material flowing out of the second outer layer flow channel maintain a certain gap instead of being fused together, so that the molten material flowing out of the second outer layer flow channel can be shaped by a shaping device in subsequent production to form a corrugated structure with higher shape and size accuracy.
[0019] Preferably, the outer layer mold core comprises a fixed sleeve and a rotating sleeve, the rotating sleeve is arranged outside the fixed sleeve and is threadedly connected to the fixed sleeve, and the third inclined portion is arranged at the end of the rotating sleeve. It can be understood that the width of the second outer layer flow channel can be changed by rotating the rotating sleeve, thereby adjusting the outer layer thickness of the double-wall corrugated pipe.
[0020] Preferably, a force-applying protrusion is provided on the outer circumferential surface of the rotating sleeve. The staff can apply torque to the rotating sleeve by driving the force-applying protrusion. The force-applying protrusion is provided to facilitate the staff to rotate the rotating sleeve.
[0021] Beneficial effects of the utility model:
[0022] (1) An inner core mold assembly is provided. The thickness of the inner layer of the double-wall corrugated pipe can be adjusted by adjusting the position of the inner core mold assembly on the central axis, which is beneficial to improving the dimensional accuracy of the double-wall corrugated pipe and reducing equipment costs.
[0023] (2) The inner core assembly includes a rotating ring, a rolling bearing and a moving core ring. The rotating ring can be rotated to drive the bearing and the moving core ring to move along the axial direction of the central axis. During the rotation of the rotating ring, the moving core ring keeps moving in a straight line, which can avoid the adverse effect of the rotation of the moving core ring on the flow of the molten material and help reduce the force required to rotate the rotating ring.
[0024] (3) A guide groove is set on the central axis to guide the linear movement of the moving core ring, which can ensure that the moving core ring maintains linear movement and prevents the moving core ring from rotating due to other external forces and affecting the flow of the molten material.
[0025] (4) The rotating ring and the moving core ring are respectively interference fit with the inner ring and the outer ring of the rolling bearing, and the connection method is simple. In addition, a first pushing structure, a second pushing structure and a third pushing structure are provided to push the rolling bearing to move axially, thereby reducing the risk of axial movement of the rotating ring and the moving core ring relative to the rolling bearing. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of a quarter cross-section of a double-wall corrugated pipe extrusion die;
[0027] Figure 2 yes Figure 1 Explosion diagram of
[0028] Figure 3 It is a schematic diagram of the external structure of a double-wall corrugated pipe extrusion die;
[0029] Figure 4 yes Figure 3 AA section view in the figure;
[0030] Figure 5 yes Figure 3 Right view of .
[0031] In the accompanying drawings: 1-central axis; 101-first inner layer flow channel; 102-second inner layer flow channel; 103-shaft neck portion; 104-guide groove; 2-middle mold core; 201-second inclined portion; 202-blowing channel; 3-outer mold core; 301-first outer layer flow channel; 302-second outer layer flow channel; 303-fixed sleeve; 304-rotating sleeve; 3041-third inclined portion; 3042-force protrusion; 4-rotating ring; 401-first pushing structure; 5-rolling bearing; 6-movable core ring; 601-first inclined portion; 602-sliding protrusion; 7-second pushing structure; 701-force blind hole; 8-third pushing structure; 9-first screw; 10-second screw. DETAILED DESCRIPTION
[0032] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.
[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.
[0034] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:
[0035] Example 1
[0036] Combination Figures 1 to 4A double-wall corrugated pipe extrusion die is shown, which includes a central axis 1, an inner core mold assembly, an intermediate core mold 2 and an outer core mold 3; the inner core mold assembly is connected to the central axis 1, and a first inclined portion 601 is provided on the inner core mold assembly; a second inclined portion 201 is provided at the end of the intermediate core mold 2; a third inclined portion 3041 is provided at the end of the outer core mold 3; a first inner layer flow channel 101 is formed between the central axis 1 and the intermediate core mold 2, and a second inner layer flow channel 102 connected to the first inner layer flow channel 101 is formed between the first inclined portion 601 and the second inclined portion 201; a first outer layer flow channel 301 is formed between the intermediate core mold 2 and the outer core mold 3, and a second outer layer flow channel 302 connected to the first outer layer flow channel 301 is formed between the second inclined portion 201 and the third inclined portion 3041; specifically, the inner core mold assembly is sleeved on the outside of the central axis 1 and is threadedly connected to the central axis 1.
[0037] It can be understood that the central axis 1, the middle mold core 2 and the outer mold core 3 are all used to connect to the extruder. During the extrusion molding process, the inner layer raw material flows into the second inner layer flow channel 102 through the first inner layer flow channel 101, and then flows out through the port of the second inner layer flow channel 102, thereby forming the inner layer of the double-wall corrugated pipe; the outer layer raw material flows into the second outer layer flow channel 302 through the first outer layer flow channel 301, and then flows out through the port of the second outer layer flow channel 302, thereby forming the outer layer of the double-wall corrugated pipe.
[0038] Specifically, see Figure 1 , Figure 2 and Figure 4, a shaft neck 103 is provided at the end of the central shaft 1; the inner core assembly includes a rotating ring 4, a rolling bearing 5 and a moving core ring 6; the rotating ring 4 is sleeved on the outside of the shaft neck 103 and is threadedly connected to the shaft neck 103; the rolling bearing 5 is sleeved on the outside of the rotating ring 4 and the inner ring of the rolling bearing 5 is connected to the moving core ring 6; the moving core ring 6 is sleeved on the outside of the outer ring of the rolling bearing 5 and is connected to the outer ring of the rolling bearing 5; the first inclined portion 601 is provided on the moving core ring 6. When the rotating ring 4 is rotated, the inner ring of the rolling bearing 5 rotates together with the rotating ring 4 and moves along the axis direction of the central shaft 1 together with the rotating ring 4; the outer ring of the rolling bearing 5 moves along the axis direction of the central shaft 1 together with its inner ring, thereby driving the moving core ring 6 to move along the axis direction of the central shaft 1. That is to say, in the process of rotating the rotating ring 4, the moving core ring 6 does not rotate with the rotation of the rotating ring 4. First, during the extrusion molding process, the second inner layer flow channel 102 is filled with molten material. Since these molten materials have a large viscosity, if the entire inner layer mold core assembly is to be rotated, it is necessary to overcome a large friction and torque, and continuous and uniform force is required to keep the entire inner layer mold core assembly rotating, which is relatively difficult to operate. Secondly, the rotation of the entire inner layer mold core assembly will cause a complex flow pattern of the molten material, including shear effect and eddy effect, which will increase the flow resistance of the molten material, and the flow of the molten material will also become uneven, thereby affecting the inner layer quality of the double-wall corrugated pipe. After the rotating ring 4, rolling bearing 5 and moving core ring 6 are set, since the inner ring of the rolling bearing 5 can rotate relative to its outer ring, the rotation of the rotating ring 4 will not drive the moving core ring 6 to rotate, and the moving core ring 6 will keep moving in a straight line when the rotating ring 4 is rotated. Since the linear movement of the moving core ring 6 is a single-direction force, it is easier to control and apply, the rotation control of the rotating ring 4 is easier, and it can also avoid the rotation of the moving core ring 6 to affect the flow of the molten material.
[0039] Further, see Figure 2 and Figure 4 The outer circumferential surface of the central shaft 1 is provided with a guide groove 104, and the inner circumferential surface of the movable core ring 6 is provided with a sliding protrusion 602, and the sliding protrusion 602 is slidably connected with the guide groove 104 along the axial direction of the central shaft 1. The guide groove 104 guides the sliding protrusion 602, so that the movable core ring 6 keeps moving in the axial direction of the central shaft 1, and does not rotate due to other external forces, so as to avoid the rotation of the movable core ring 6 affecting the flow of the molten material in the second inner layer flow channel 102.
[0040] Furthermore, there are multiple guide grooves 104 and they are distributed circumferentially with the axis of the central axis 1 as the array axis, and there are multiple sliding protrusions 602 and they are slidably connected with the guide grooves 104 in a one-to-one correspondence. Providing multiple guide grooves 104 and multiple sliding protrusions 602 can make the force on the moving core ring 6 more uniform, so as to maintain a more stable state during movement.
[0041] The working principle or workflow of this embodiment is as follows: when it is necessary to adjust the inner wall thickness of the double-wall corrugated tube, rotate the rotating ring 4, the inner ring of the rolling bearing 5 will rotate together with the rotating ring 4, and move together with the rotating ring 4 along the axial direction of the central axis 1; the outer ring of the rolling bearing 5 moves along the axial direction of the central axis 1 together with its inner ring, thereby driving the movable core ring 6 to move along the axial direction of the central axis 1, so that the first inclined portion 601 moves along the axial direction of the central axis 1, and when the first inclined portion 601 moves, the gap between it and the second inclined portion 201 changes, and the port width of the second inner layer flow channel 102 also changes, thereby extruding layer structures of different thicknesses to achieve adjustment of the wall thickness of the inner layer of the double-wall corrugated tube.
[0042] The beneficial effects of this embodiment are as follows: (1) an inner core mold assembly is provided, and the thickness of the inner layer of the double-wall corrugated tube can be adjusted by adjusting the position of the inner core mold assembly on the central axis, which is beneficial to improving the dimensional accuracy of the double-wall corrugated tube and reducing equipment costs.
[0043] (2) The inner core assembly includes a rotating ring, a rolling bearing and a moving core ring. The rotating ring can be rotated to drive the bearing and the moving core ring to move along the axial direction of the central axis. During the rotation of the rotating ring, the moving core ring keeps moving in a straight line, which can avoid the adverse effect of the rotation of the moving core ring on the flow of the molten material and help reduce the force required to rotate the rotating ring.
[0044] Example 2
[0045] This embodiment is based on the embodiment 1, combined with Figures 1 to 5 As shown, the outer circumferential surface of the rotating ring 4 is interference fit with the inner ring of the rolling bearing 5, so that the rotating ring 4 and the inner ring of the rolling bearing 5 remain relatively fixed; the outer circumferential surface of the moving core ring 6 and the outer ring of the rolling bearing 5 are interference fit, so that the moving core ring 6 and the outer ring of the rolling bearing 5 remain relatively fixed. The interference fit method is simpler than other connection methods.
[0046] Further, the first pushing structure 401 is provided at one end of the rotating ring 4, and the second pushing structure 7 is provided at the other end, and the inner ring of the rolling bearing 5 is located between the first pushing structure 401 and the second pushing structure 7; the third pushing structure 8 is connected to the end of the moving core ring 6, and the outer ring of the rolling bearing 5 is located between the sliding protrusion 602 and the third pushing structure 8. It can be understood that the first pushing structure 401 and the second pushing structure 7 can prevent the rolling bearing 5 from being separated from the rotating ring 4. When the width of the second inner layer flow channel 102 needs to be adjusted, during the process of rotating the rotating ring 4, the first pushing structure 401 and the second pushing structure 7 can respectively push the inner ring of the rolling bearing 5, thereby reducing the risk of relative movement between the rotating ring 4 and the inner ring of the rolling bearing 5 in the axial direction. In the process of the moving core ring 6 moving left and right along the direction of the central axis 1, the sliding protrusion 602 and the third pushing structure 8 can respectively push the outer ring of the rolling bearing 5, thereby reducing the risk of relative movement between the moving core ring 6 and the outer ring of the rolling bearing 5 in the axial direction. The provision of the first pushing structure 401 , the second pushing structure 7 and the third pushing structure 8 can make the adjustment of the moving distance of the moving core ring 6 more reliable.
[0047] Specifically, the second pushing structure 7 is annular and is connected to the rotating ring 4 through a first screw 9, and the third pushing structure 8 is annular and is connected to the movable core ring 6 through a second screw 10. That is to say, the second pushing structure 7 and the rotating ring 4, and the third pushing structure 8 and the movable core ring 6 are all detachably connected, which can facilitate the assembly of the rolling bearing 5 on the extrusion die.
[0048] Furthermore, a plurality of force-applying blind holes 701 are distributed around the end of the second pushing structure 7. After the force-applying blind holes 701 are provided, the staff can insert a rod-shaped structure on the force-applying blind holes 701, and drive the rotating ring 4 to rotate by driving the rod-shaped structure. The force-applying blind holes 701 are provided to facilitate driving the rotating ring 4 to rotate.
[0049] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.
[0050] Example 3
[0051] This embodiment is based on the embodiment 2, combined with Figures 1 to 5As shown, the middle mold core 2 is provided with a blowing channel 202, which extends from one end to the other end of the middle mold core 2, and the ports of the blowing channel 202, the ports of the inner layer flow channel, and the ports of the outer layer flow channel are aligned in the axial direction of the central axis 1. The blowing channel 202 can be connected to an external air source, and in the process of simultaneously extruding the molten material from the second inner layer flow channel 102 and the second outer layer flow channel 302, air can be blown through the blowing port, so that the molten material flowing out of the second inner layer flow channel 102 and the molten material flowing out of the second outer layer flow channel 302 maintain a certain gap instead of being fused together, so that the shaping device in subsequent production can shape the molten material flowing out of the second outer layer flow channel 302 to form a corrugated structure with higher shape and size accuracy.
[0052] Further, the outer core mold 3 includes a fixed sleeve 303 and a rotating sleeve 304, the rotating sleeve 304 is sleeved on the outside of the fixed sleeve 303 and is threadedly connected to the fixed sleeve 303, and the third inclined portion 3041 is provided at the end of the rotating sleeve 304. It can be understood that the width of the second outer layer flow channel 302 can be changed by rotating the rotating sleeve 304, thereby realizing the adjustment of the outer layer thickness of the double-wall corrugated pipe.
[0053] Furthermore, a plurality of force-applying protrusions 3042 are circumferentially distributed on the outer circumferential surface of the rotating sleeve 304. The staff can apply a torque to the rotating sleeve 304 by driving the force-applying protrusions 3042. The force-applying protrusions 3042 are provided to facilitate the staff to rotate the rotating sleeve 304.
[0054] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.
[0055] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description, and it is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.
Claims
1. A double-wall corrugated pipe extrusion die, comprising a central shaft (1), an inner core mold assembly, an intermediate core mold (2) and an outer core mold (3); the inner core mold assembly is connected to the central shaft (1), and a first inclined portion (601) is provided on the inner core mold assembly; a second inclined portion (201) is provided at the end of the intermediate core mold (2); a third inclined portion (3041) is provided at the end of the outer core mold (3); a first inner core mold assembly is formed between the central shaft (1) and the intermediate core mold (2); The flow channel (101) is characterized in that a second inner flow channel (102) connected to the first inner flow channel (101) is formed between the first inclined portion (601) and the second inclined portion (201); a first outer flow channel (301) is formed between the middle mold core (2) and the outer mold core (3); a second outer flow channel (302) connected to the first outer flow channel (301) is formed between the second inclined portion (201) and the third inclined portion (3041); and the second inner flow channel (102) connected to the first inner flow channel (101) is formed between the first inclined portion (601) and the second inclined portion (201); The inner layer mold core assembly is sleeved outside the central shaft (1) and is threadedly connected to the central shaft (1).
2. A double-wall corrugated pipe extrusion die according to claim 1, characterized in that: The end of the central shaft (1) is provided with a shaft neck (103); the inner core assembly comprises a rotating ring (4), a rolling bearing (5) and a movable core ring (6); the rotating ring (4) is sleeved on the outside of the shaft neck (103) and is threadedly connected to the shaft neck (103); the rolling bearing (5) is sleeved on the outside of the rotating ring (4) and the inner ring of the rolling bearing (5) is connected to the movable core ring (6); the movable core ring (6) is sleeved on the outside of the outer ring of the rolling bearing (5) and is connected to the outer ring of the rolling bearing (5); the first inclined portion (601) is arranged on the movable core ring (6).
3. A double-wall corrugated pipe extrusion die according to claim 2, characterized in that: A guide groove (104) is provided on the outer circumferential surface of the central shaft (1), and a sliding protrusion (602) is provided on the inner circumferential surface of the movable core ring (6). The sliding protrusion (602) is slidably connected to the guide groove (104) along the axial direction of the central shaft (1).
4. A double-wall corrugated pipe extrusion die according to claim 3, characterized in that: The guide grooves (104) are provided in plurality and are distributed in a circle with the axis of the central axis (1) as the array axis. The sliding protrusions (602) are also provided in plurality and are slidably connected to the guide grooves (104) in a one-to-one correspondence.
5. A double-wall corrugated pipe extrusion die according to claim 3, characterized in that: The outer circumferential surface of the rotating ring (4) is interference fit with the inner ring of the rolling bearing (5); and the outer circumferential surface of the moving core ring (6) is interference fit with the outer ring of the rolling bearing (5).
6. A double-wall corrugated pipe extrusion die according to claim 5, characterized in that: One end of the rotating ring (4) is provided with a first pushing structure (401), and the other end is provided with a second pushing structure (7), and the inner ring of the rolling bearing (5) is located between the first pushing structure (401) and the second pushing structure (7); the end of the moving core ring (6) is connected to a third pushing structure (8), and the outer ring of the rolling bearing (5) is located between the sliding protrusion (602) and the third pushing structure (8).
7. A double-wall corrugated pipe extrusion die according to claim 6, characterized in that: A force-applying blind hole (701) is provided at the end of the second pushing structure (7) or the rotating ring (4).
8. A double-wall corrugated pipe extrusion die according to claim 1, characterized in that: The middle mold core (2) is provided with a blowing channel (202), and the blowing channel (202) extends from one end of the middle mold core (2) to the other end, and the port of the blowing channel (202), the port of the inner layer flow channel and the port of the outer layer flow channel are aligned in the axial direction of the central axis (1).
9. A double-wall corrugated pipe extrusion die according to any one of claims 1 to 8, characterized in that: The outer layer mold core (3) comprises a fixed sleeve (303) and a rotating sleeve (304), wherein the rotating sleeve (304) is sleeved on the outside of the fixed sleeve (303) and is threadedly connected to the fixed sleeve (303), and the third inclined portion (3041) is arranged at the end of the rotating sleeve (304).
10. A double-wall corrugated pipe extrusion die according to claim 9, characterized in that: A force-applying protrusion (3042) is provided on the outer circumferential surface of the rotating sleeve (304).