Large-caliber thick-wall pipe mold
By designing a large diameter thick-walled pipe mold for plastic pipe production, the material flow is controlled by using the raised block and runner structure, the problem of uneven wall thickness during the extrusion molding of thick-walled pipes is solved and the product quality is improved.
Patent Information
- Application Number
- CN202421480801.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-06-26
AI Technical Summary
During the production process of plastic pipes, thick-walled pipes are prone to uneven wall thickness problems during the extrusion molding process, resulting in a decline in product quality.
A large diameter thick-walled pipe mold is designed, including a base, a die core, a raised block and a die sleeve. By setting a raised block between the outside of the die core and the base, a flow channel is formed to control material flow and avoid uneven wall thickness.
The uniformity of the pipe wall thickness is effectively controlled, the overall quality of the product is improved, and the sagging phenomenon caused by uneven cooling rate is avoided.
Smart Images
Figure CN222807584U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of molds, and in particular to a large-diameter thick-walled pipe mold. Background Art
[0002] In the production process of plastic pipes, extrusion molding technology is commonly used. Extrusion molding is to extrude the molten plastic material through a die hole of a specific shape through heating and pressure, and cool and solidify at the die outlet to form a plastic product with the desired cross-sectional shape. However, there are some factors that affect product quality in this process.
[0003] When a plastic pipe is extruded from a mold, the plastic material is in a molten state at high temperature and has good fluidity, so it can fill the mold cavity. However, if the wall thickness of the pipe is designed to be large, the plastic in the core area will take longer to cool and solidify during the extrusion process. Since the cooling rate is affected by many factors, such as ambient temperature, the efficiency of the cooling system, and the thermal conductivity of the plastic itself, in some cases, the inner wall may not be cooled quickly enough, resulting in sag and uneven pipe wall thickness. Utility Model Content
[0004] The utility model provides a large-diameter thick-wall pipe die, which solves the problem of uneven wall thickness during the extrusion molding process of the large-diameter thick-wall pipe in the related technology.
[0005] The technical solution of the utility model is as follows:
[0006] A large-diameter thick-walled pipe die, used for pipe extrusion molding, comprising:
[0007] Base;
[0008] Mold cores, the number of which is several and the mold cores are evenly distributed along the circumference of the base axis;
[0009] A plurality of raised blocks, wherein the raised blocks are provided, and when the axis is horizontal, a horizontal plane passing through the axis is used as a reference plane, and the raised blocks are arranged on the outer side of the mold core between the reference plane and the lowermost mold core;
[0010] A mold sleeve is arranged on the outside of the base and the mold core, and a flow channel is provided between the mold sleeve, the base and the mold core.
[0011] Optionally, a first step is provided at abutment between the mold core and the base.
[0012] Optionally, there is a second step at the abutment point of adjacent mold cores.
[0013] Optionally, the outer side of the mold core has a first dovetail groove, the inner side of the protrusion block has a first dovetail protrusion, and the first dovetail protrusion abuts against the first dovetail groove.
[0014] Optionally, the mold core is split, and the mold core includes:
[0015] A first module, wherein the first module is arranged on the base, and a second dovetail groove is provided on an outer side of the first module;
[0016] A second module, wherein the second module has a second dovetail protrusion on the inner side, the second dovetail protrusion is arranged in the second dovetail groove, and the second module has a third dovetail groove on the outer side;
[0017] The third module has a third dovetail protrusion on the inner side thereof, the third dovetail protrusion abuts against the third dovetail groove, and the first dovetail groove is located on the outer side of the third module.
[0018] Optionally, the mold sleeve has a plurality of lifting positions for lifting operations during installation.
[0019] Optionally, the base has ventilation holes for accelerating the cooling of the inner wall of the pipe to be formed.
[0020] Optionally, the flow channel has a transition section and a straight flow section.
[0021] Optionally, the raised block has a plurality of positioning holes.
[0022] The working principle and beneficial effects of the utility model are:
[0023] In the utility model, in order to solve the problem of uneven wall thickness during the extrusion molding of large-diameter thick-walled pipes, a mold is designed, including a base, a mold core, a protruding block and a mold sleeve. Specifically, when thick-walled pipes need to be produced, the base is first installed at the material outlet, and then the mold core is evenly installed on the base along the circumference of the base axis. When the base axis is horizontal, the horizontal plane passing through the axis is used as the reference plane, the protruding block is arranged on the outside of the mold core between the reference plane and the lowermost mold core, and finally the mold sleeve is installed at the material outlet, and a flow channel is formed between the base, the mold core and the mold sleeve for the material to pass through and extrude to form a pipe.
[0024] The advantage is that, since the raised block is installed on the outside of the mold core between the reference surface and the bottom mold core, it can avoid the phenomenon that during the cooling and solidification process of the plastic product, the surface cools faster than the inside, causing the surface to solidify first while the internal material remains molten. As the internal material continues to flow, the surface will become concave or uneven. The existence of the raised block can effectively control the uniformity of the wall thickness of the pipe and improve the overall quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.
[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0027] Figure 2 This is a cross-sectional view of the overall structure of the utility model;
[0028] Figure 3 This is a schematic diagram of the structure of the protruding block of the utility model;
[0029] Figure 4 This is a schematic diagram of the structure of the first module of the utility model;
[0030] Figure 5 This is a schematic diagram of the structure of the second module of the utility model;
[0031] Figure 6 This is a schematic diagram of the third module structure of the utility model.
[0032] In the figure: 1, base, 2, mold core, 3, raised block, 4, mold sleeve, 5, runner, 101, first step, 201, second step, 202, first dovetail groove, 301, first dovetail protrusion, 203, first module, 2031, second dovetail groove, 204, second module, 2041, second dovetail protrusion, 2042, third dovetail groove, 205, third module, 2051, third dovetail protrusion, 401, lifting position, 102, ventilation hole, 501, transition section, 502, DC section, 302, positioning hole. DETAILED DESCRIPTION
[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.
[0034] In order to simplify the drawings, only the parts related to the utility model are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".
[0035] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0036] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0037] Reference Figure 1 to Figure 6 , which is the first embodiment of the utility model, proposes a large-diameter thick-walled pipe mold for pipe extrusion molding, including a base 1; a number of mold cores 2, which are evenly distributed along the circumference of the axis of the base 1; a number of raised blocks 3, when the axis is horizontal, the horizontal plane passing through the axis is used as the reference plane, and the raised blocks 3 are arranged on the outside of the mold core 2 between the reference plane and the lowermost mold core 2; a mold sleeve 4 is sleeved on the outside of the base 1 and the mold core 2, and a flow channel 5 is provided between the mold sleeve 4 and the base 1 and the mold core 2.
[0038] In the present embodiment, in order to solve the problem of uneven wall thickness during the extrusion molding of large-diameter thick-walled pipes, a mold is designed, including a base 1, a mold core 2, a protruding block 3 and a mold sleeve 4. Specifically, when thick-walled pipes need to be produced, the base 1 is first installed at the material outlet, and then the mold core 2 is evenly installed on the base 1 along the circumference of the axis of the base 1. When the axis of the base 1 is horizontal, the horizontal plane passing through the axis is used as the reference plane, and the protruding block 3 is arranged on the outside of the mold core 2 between the reference plane and the lowermost mold core 2. Finally, the mold sleeve 4 is installed at the material outlet, and a flow channel 5 is formed between the base 1, the mold core 2 and the mold sleeve 4 for the material to pass through and extrude to form a pipe.
[0039] The advantage is that, since the protruding block 3 is installed on the outer side of the mold core 2 between the reference surface and the lowermost mold core 2, it can avoid the phenomenon that during the cooling and solidification process of the plastic product, the surface cools faster than the inside, so that the surface solidifies first while the internal material remains in a molten state, and as the internal material continues to flow, the surface will appear concave or uneven. The existence of the protruding block 3 can effectively control the uniformity of the wall thickness of the pipe and improve the overall quality of the product.
[0040] Furthermore, a first step 101 is provided at the joint between the mold core 2 and the base 1 .
[0041] In this embodiment, a first step 101 is provided between the mold core 2 and the base 1 to prevent the material from flowing in from the gap between the mold core 2 and the base 1 .
[0042] Furthermore, a second step 201 is formed at the abutment position of adjacent mold cores 2 .
[0043] In this embodiment, a second step 201 is provided between adjacent mold cores 2 to prevent the material from flowing in from the gaps at the connection of the mold cores 2 .
[0044] Furthermore, the outer side of the mold core 2 has a first dovetail groove 202 , the inner side of the protrusion block 3 has a first dovetail protrusion 301 , and the first dovetail protrusion 301 abuts against the first dovetail groove 202 .
[0045] In this embodiment, the outer side of the mold core 2 has a first dovetail groove 202 and the inner side of the protrusion block 3 has a first dovetail protrusion 301. The first dovetail groove 202 is arranged in the first dovetail protrusion 301 and abuts against each other so that the two can be firmly connected.
[0046] Furthermore, the mold core 2 is split, and the mold core 2 includes a first module 203, the first module 203 is arranged on the base 1, and the outer side of the first module 203 has a second dovetail groove 2031; the inner side of the second module 204 has a second dovetail protrusion 2041, the second dovetail protrusion 2041 is arranged in the second dovetail groove 2031, and the outer side of the second module 204 has a third dovetail groove 2042; the inner side of the third module 205 has a third dovetail protrusion 2051, the third dovetail protrusion 2051 is abutted against the third dovetail groove 2042, and the first dovetail groove 202 is located on the outer side of the third module 205.
[0047] In this embodiment, the mold core 2 is configured to be split, divided into a first module 203, a second module 204 and a third module 205, the second dovetail protrusion 2041 is arranged in the second dovetail groove 2031; the third dovetail protrusion 2051 is abutted against the third dovetail groove 2042, and the first dovetail groove 202 is located on the outside of the third module 205. This design firmly connects the protrusion block 3, the first module 203, the second module 204 and the third module 205 together; when it is necessary to change the wall thickness of the pipe, the third module 205 is first removed, and the first dovetail protrusion 301 on the protrusion block 3 of different models is arranged in the third dovetail groove 2042 on the second module 204, so as to achieve the purpose of changing the thickness of the finished pipe. The thickness of the finished pipe can be arbitrarily changed according to this process as needed.
[0048] Furthermore, the mold sleeve 4 has a plurality of hoisting positions 401 for hoisting operations during installation.
[0049] In this embodiment, a plurality of hoisting positions 401 are additionally provided on the outside of the mold sleeve 4. The advantage is that when the mold sleeve 4 needs to be installed, the mold sleeve 4 can be hoisted, making the mold sleeve 4 easy to install.
[0050] Furthermore, the base 1 has ventilation holes 102 for accelerating the cooling of the inner wall of the pipe to be formed.
[0051] In this embodiment, a ventilation hole 102 is provided at the center of the base 1 to accelerate the cooling of the inner wall of the tube when the tube is extruded, and also to accelerate the cooling speed of the entire mold.
[0052] Furthermore, the flow channel 5 has a transition section 501 and a straight flow section 502 .
[0053] In this embodiment, the flow channel 5 includes a straight section 502 and a transition section 501. The advantage is that the design of the transition section 501 ensures that the mold outlet size is accurately matched with the expected pipe specifications; the design of the straight section 502 aims to effectively improve the stability and efficiency of the production process by maintaining the speed and pressure of the material flow.
[0054] Furthermore, the protruding block 3 has a plurality of positioning holes 302 .
[0055] In this embodiment, the additional positioning holes 302 further enable the protruding block 3 to be positioned more accurately, thereby avoiding the situation where the thickness of the tube is uneven during the material extrusion process.
[0056] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A large-caliber thick-walled pipe die for pipe extrusion molding, characterized in that: include: Base (1); Mold cores (2), the mold cores (2) being of a certain number and evenly distributed along the circumference of the axis of the base (1); A raised block (3), wherein the raised blocks (3) are in a plurality of numbers, and when the axis is horizontal, a horizontal plane passing through the axis is used as a reference plane, and the raised blocks (3) are arranged on the outside of the mold core (2) between the reference plane and the lowermost mold core (2); A mold sleeve (4), the mold sleeve (4) being sleeved on the outside of the base (1) and the mold core (2), and a flow channel (5) being provided between the mold sleeve (4), the base (1) and the mold core (2).
2. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: A first step (101) is provided at the point where the mold core (2) abuts against the base (1).
3. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: A second step (201) is provided at the abutment position of adjacent mold cores (2).
4. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: The outer side of the mold core (2) has a first dovetail groove (202), the inner side of the protrusion block (3) has a first dovetail protrusion (301), and the first dovetail protrusion (301) abuts against the first dovetail groove (202).
5. A large-diameter thick-walled pipe mold according to claim 4, characterized in that: The mold core (2) is of a split type, and the mold core (2) comprises: A first module (203), the first module (203) being arranged on the base (1), and the outer side of the first module (203) having a second dovetail groove (2031); A second module (204), the second module (204) having a second dovetail protrusion (2041) on its inner side, the second dovetail protrusion (2041) being arranged in the second dovetail groove (2031), and the second module (204) having a third dovetail groove (2042) on its outer side; A third module (205), wherein the inner side of the third module (205) has a third dovetail protrusion (2051), the third dovetail protrusion (2051) abuts against the third dovetail groove (2042), and the first dovetail groove (202) is located on the outer side of the third module (205).
6. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: The mold sleeve (4) has a plurality of hoisting positions (401) for performing hoisting operations during installation.
7. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: The base (1) has ventilation holes (102) for accelerating the cooling of the inner wall of the pipe to be formed.
8. The large-diameter thick-walled pipe mold according to claim 1, characterized in that: The flow channel (5) comprises a transition section (501) and a straight flow section (502).
9. A large-diameter thick-walled pipe mold according to claim 1, characterized in that: The raised block (3) has a plurality of positioning holes (302).