Die sizing structure
By designing a die sizing structure and using gaps and grooves to buffer materials, the problem of PE pipe sag was solved, wall thickness uniformity and production efficiency were improved, and scrap was reduced.
Patent Information
- Application Number
- CN202423122980.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In the production of PE pipes, due to the low thermal conductivity of polyethylene, radial curing is slow, and the melt sags and accumulates at the bottom of the mold, resulting in uneven wall thickness and a large number of waste products. Existing cooling methods are difficult to solve this problem effectively.
A die sizing structure is designed, including a die body, a mandrel, and a sizing sleeve. By setting gaps and grooves, the wall thickness of the plastic material is controlled, and the grooves are used as a buffer area to prevent material blockage and achieve timely adjustment.
It effectively reduces the sagging problem of large-diameter PE pipes, improves the uniformity of product wall thickness, reduces the scrap rate, and simplifies the production and debugging process.
Smart Images
Figure CN223750217U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a mouth die sizing equipment technical field more particularly, relate to a kind of mouth die sizing structure. BACKGROUND
[0002] In the PE pipe production process, due to the low thermal conductivity of polyethylene, the radial curing process is slow, and the time required for curing the inside of the pipe wall is long, which causes the melt to flow along the inside of the pipe wall. Due to the weight, the melt is prone to sagging and accumulating at the lower end of the mold, causing the pipe wall thickness to be thin at the top and thick at the bottom, which is difficult to adjust. When the melt sagging phenomenon occurs, the wall thickness of the product often fails to meet the standard, resulting in a large amount of waste. To solve this problem, most existing methods use air cooling and water cooling to cool the billet, allowing it to form quickly. However, in actual production, cooling alone often fails to meet the desired requirements. Therefore, it is of great significance to develop a mold structure that solves the sagging problem of PE large-diameter pipes. SUMMARY
[0003] The utility model aims at overcoming the shortcomings of the prior art, providing a mouth die sizing structure to solve the sagging problem of PE large-diameter pipes.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a mouth die sizing structure, comprising a mouth die body, a core rod one, a sizing sleeve, the core rod one passes through the mouth die body, the mouth die body and the core rod one are coaxially arranged, the core rod one is provided with a core rod two, the core rod two is coaxially arranged with the core rod one, the core rod two extends out of the outlet end of the mouth die body, the sizing sleeve is coaxially arranged with the mouth die body, the core rod two is inserted into the sizing sleeve away from one end of the core rod one, the core rod two is provided with a ring part two, a ring part three and a groove, the ring part two is located on the side close to the core rod one, the ring part three is located on the radial inner side of the sizing sleeve, and the groove is located between the ring part two and the ring part three.
[0005] The utility model is further provided with a gap part one between the inner circumferential wall of the mouth die body and the outer circumferential wall of the core rod one, and a gap part two between the outer circumferential wall of the ring part three and the inner circumferential wall of the sizing sleeve, both the gap part two and the gap part one are circular, and the difference between the outer diameter and the inner diameter of the gap part two is smaller than the difference between the outer diameter and the inner diameter of the gap part one.
[0006] The utility model is further provided with a gap part two between the outer diameter of the ring part three and the outer diameter of the gap part one, and the difference between the outer diameter of the ring part three and the outer diameter of the gap part one is 1mm-3mm.
[0007] The utility model is further provided with a ring part one on the core rod two, which is inserted into the core rod one with an interference fit.
[0008] The utility model is further provided with an outer diameter of the ring part two being the same as the outer diameter of the core rod one.
[0009] The utility model further sets up, ring department three outer diameter is greater than ring department two outer diameter, the inside diameter of sizing sleeve is less than the inside diameter of die body.
[0010] The utility model further sets up, the minimum outer diameter of recess is less than ring department three outer diameter, ring department two outer diameter.
[0011] The utility model further sets up, the outer diameter of core rod one is 800mm-1600mm.
[0012] Summarized above, the utility model has following beneficial effect:
[0013] In the production debugging link, if the wall thickness is too big when plastic material extrudes gap part one right end, then plastic material is congested at gap part two and leads to material being pushed back to recess, recess is the buffer area of excess material, prevents material congestion leading to start-up difficulty when debugging, when plastic material is accumulated downward due to gravity, leading to the thickness size of lower plastic material being too big, and sagging problem is generated, material congestion appears at the lower part of gap part two, plastic material is pushed back to recess, along with the increase of material in recess, the outer wall of plastic material will appear obvious swelling bulge, and start-up debugging personnel can judge whether there is wall thickness deviation problem through the phenomenon, thereby making timely adjustment, reducing the generation of waste, and then solving the sagging problem of PE large diameter pipe material. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is the sectional view of the embodiment;
[0015] Figure 2 It is Figure 1 The enlarged view of A in the middle;
[0016] Figure 3 It is the sectional view of core rod two in the embodiment.
[0017] Drawing reference: die body 1, gap part one 11, core rod one 2, core rod two 3, ring part one 31, ring part two 32, ring part three 33, recess 34, sizing sleeve 4, gap part two 41. DETAILED DESCRIPTION
[0018] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiment, and apparently, the described embodiments only are a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of the utility model protection.
[0019] As Figures 1-3 Shown, the embodiment discloses a die sizing structure, including die body 1, core rod one 2, sizing sleeve 4, Figure 1The die body 1 is a circular ring structure, and the die body 1 is an extrusion outlet of a plastic extrusion molding machine. The die body 1 is coaxially arranged with the first mandrel 2, the first mandrel 2 passes through the die body 1, Figure 1 The arrow in the figure indicates the plastic extrusion direction. In the embodiment, the extruded product is a PE large-diameter pipe with a diameter of more than 800 mm, and the outer diameter of the first mandrel 2 is 800-1600 mm. The sizing sleeve 4 is coaxially arranged with the die body 1, and the sizing sleeve 4 is located on the right side of the die body 1.
[0020] As shown in Figure 1 , Figure 2 , a gap part one 11 is formed between the inner wall of the die body 1 and the outer wall of the first mandrel 2, the gap part one 11 is a circular ring, the extruded plastic is cooled and formed in the gap part one 11, and when the plastic leaves the right end of the die body 1, the plastic is still soft.
[0021] As shown in Figure 1 , Figure 2 , the first mandrel 2 is provided with a second mandrel 3, the second mandrel 3 is a circular ring structure, the second mandrel 3 is provided with a ring part one 31, and the ring part one 31 is inserted into the inner wall of the first mandrel 2 in an interference fit to be fixed. The second mandrel 3 is coaxially arranged with the first mandrel 2, and the second mandrel 3 extends out of the right outlet end of the die body 1. The second mandrel 3 is also provided with a ring part two 32, a ring part three 33 and a groove 34. The ring part two 32 is located on the side close to the first mandrel 2, the left end face of the ring part two 32 is attached to the right end face of the first mandrel 2, and the outer diameter of the ring part two 32 is the same as the outer diameter of the first mandrel 2, so that the plastic passing through the gap part one 11 can smoothly transition to the ring part one 31.
[0022] The ring part three 33 is located at the right end of the second mandrel 3, the ring part three 33 is inserted into the sizing sleeve 4, a gap part two 41 is formed between the outer wall of the ring part three 33 and the inner wall of the sizing sleeve 4, the gap part two 41 is a circular ring, the outer diameter of the ring part three 33 is greater than the outer diameter of the ring part two 32, the inner diameter of the sizing sleeve 4 is smaller than the inner diameter of the die body 1, the difference between the outer diameter and the inner diameter of the gap part two 41 is smaller than the difference between the outer diameter and the inner diameter of the gap part one 11, and the difference between the outer diameter of the gap part two 41 and the outer diameter of the gap part one 11 is 1-3 mm, so that the plastic extruded from the gap part one 11 is again sized by the gap part two 41 to form a product with a slightly thinner thickness, and the plastic material fully contacts the inner wall of the pipeline in the gap part two 41, adjusts the wall thickness, and improves the wall surface quality of the plastic material after molding.
[0023] Along the axial direction of the second mandrel 3, the groove 34 is located between the ring part two 32 and the ring part three 33, and the minimum outer diameter of the groove 34 is smaller than the outer diameter of the ring part three 33 and the outer diameter of the ring part two 32. In the normal production link, when the plastic material passes through the groove 34, the plastic material has been formed, and the inner wall of the plastic material is transmitted along the maximum outer diameter of the groove 34, and will not enter the groove 34.
[0024] In the production debugging link, if the wall thickness of the right end of the plastic material extrusion gap part 11 is too large, the plastic material will be congested at the gap part 2 41 and pushed back into the groove 34, and the groove 34 serves as a buffer area for the excess material to prevent the material from being congested during debugging, causing difficulty in starting.
[0025] When the plastic material is accumulated downward due to gravity, the lower part of the plastic material is thicker, and the material is congested at the lower part of the gap part 2 41 and pushed back into the groove 34. As the amount of material in the groove 34 increases, the outer wall of the plastic material will bulge obviously. The operator can determine whether there is a wall thickness deviation problem by observing this phenomenon, and make timely adjustments. After successfully entering the gap part 2 41, the plastic material will be fully cooled and formed, and the product formed at this time is a qualified product within the control range.
[0026] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the scope of the present application is within the protection scope of the present application. It should be noted that for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application are also considered to be within the protection scope of the present application.
Claims
1. A die sizing structure, characterized by, The utility model relates to a kind of die body (1), core rod one (2), sizing sleeve (4), the core rod one (2) passes through die body (1), the die body (1) is coaxially arranged with the core rod one (2), the core rod one (2) is equipped with core rod two (3), the core rod two (3) is coaxially arranged with the core rod one (2), the core rod two (3) extends the outlet end of the die body (1), the sizing sleeve (4) is coaxially arranged with the die body (1), the core rod two (3) is inserted into the sizing sleeve (4) away from the core rod one (2) one end, the core rod two (3) is equipped with ring part two (32), ring part three (33), recess (34), the ring part two (32) is located close to the core rod one (2) side, the ring part three (33) is located the radial inner side of the sizing sleeve (4), the recess (34) is located between the ring part two (32) and the ring part three (33).
2. A die sizing structure according to claim 1, wherein The gap part one (11) is formed between the inner wall of the die body (1) and the outer wall of the core rod one (2), the gap part two (41) is formed between the outer wall of the ring part three (33) and the inner wall of the sizing sleeve (4), the gap part two (41) and gap part one (11) are annular, the difference between the outer diameter and the inner diameter of the gap part two (41) is less than the difference between the outer diameter and the inner diameter of the gap part one (11).
3. A die sizing structure according to claim 2, wherein The difference between the outer diameter of the gap part two (41) and the outer diameter of the gap part one (11) is 1mm-3mm.
4. A die sizing structure according to claim 1 wherein, The core rod two (3) is also provided with ring part one (31), and the ring part one (31) is inserted into the core rod one (2) in interference fit.
5. A die sizing structure according to claim 1 wherein, The outer diameter of the ring part two (32) is the same as the outer diameter of the core rod one (2).
6. A die sizing structure according to claim 5, wherein The outer diameter of the ring part three (33) is greater than the outer diameter of the ring part two (32), and the inner diameter of the sizing sleeve (4) is less than the inner diameter of the die body (1).
7. A die sizing structure according to claim 1 wherein, The minimum outer diameter of the recess (34) is less than the outer diameter of the ring part three (33) and the outer diameter of the ring part two (32).
8. A die sizing structure according to claim 1 wherein, The outer diameter of the core rod one (2) is 800mm-1600mm.