CN219789211U - Core rod of hollow blow molding machine die head - Google Patents
Core rod of hollow blow molding machine die head Download PDFInfo
- Publication number
- CN219789211U CN219789211U CN202321331414.3U CN202321331414U CN219789211U CN 219789211 U CN219789211 U CN 219789211U CN 202321331414 U CN202321331414 U CN 202321331414U CN 219789211 U CN219789211 U CN 219789211U
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- Prior art keywords
- mandrel
- flow
- flow channel
- die head
- guide post
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- 238000000071 blow moulding Methods 0.000 title claims abstract description 10
- 230000007704 transition Effects 0.000 claims abstract description 16
- 230000007423 decrease Effects 0.000 claims description 2
- 239000004033 plastic Substances 0.000 abstract description 62
- 229920003023 plastic Polymers 0.000 abstract description 62
- 238000009825 accumulation Methods 0.000 abstract description 7
- 238000003763 carbonization Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000003086 colorant Substances 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model belongs to the technical field of hollow blow molding, in particular to a mandrel of a hollow blow molding machine die head, the top surface of a first flow channel is provided with an arc curved surface, the joint of the arc curved surface and the surface of the mandrel forms a tip, when the mandrel is matched with an inner hole of a die head main body, the tip is connected with the inner hole wall of the die head main body, so that the inner wall of the die head main body is smoothly connected with the semicircular arc on the top surface of the first flow channel, the arc transitional connection is formed between the top surface of the first flow channel and the side surface of the first flow channel, when plastics flow from a feed inlet of the die head main body, the plastics can smoothly flow through the arc curved surface along the inner wall of the first flow channel, compared with the flow channel adopting a right angle, the transition is smoother, the retention of the plastics at the right angle is avoided, the speed of plastics flowing is accelerated, the plastics with different colors can be directly replaced during the production, the carbonization phenomenon caused by accumulation of the materials is accelerated, the problem of black points can be avoided during the production of the existing products is avoided, and the qualification rate of products is improved.
Description
Technical Field
The utility model belongs to the technical field of hollow molding, and particularly relates to a core rod of a hollow blow molding machine die head.
Background
The hollow blow molding machine is a common plastic bottle molding device, plastic flows into a die head arranged at the front end after being plasticized by an extrusion mechanism, the die head comprises a die head main body 01, a core rod 02 and other parts arranged in the die head main body 01, a feed inlet is arranged on the die head main body 01, a flow channel 03 connected with the feed inlet is arranged on the surface of the core rod 02, the flow channel 03 extends downwards along the surface of the core rod 02, after the plastic flows into the die head main body 01 from the feed inlet, the plastic is distributed to the periphery of the core rod 02 along the flow channel 03 and flows downwards through a gap between the core rod 02 and the inner wall of the die head main body 01, so that tubular plastic is formed, and after flowing out from a discharge hole at the bottom of the die head, the tubular plastic is cut off and wrapped in the die to carry out a subsequent blow molding process.
As shown in fig. 1', since the top surface a of the existing runner 03 is generally disposed horizontally, a right-angled corner is formed between the inner wall b of the die body 01 and the top surface a of the runner 03 after the mandrel 02 is matched with the die body 01, and the corner extends and wraps the other side of the mandrel to form a long right-angled cross-section runner, so that smoothness of plastic flow is not only affected, but also when plastics with different colors need to be replaced, since plastics with the previous color are accumulated in the right-angled position, a plastic accumulation area d as shown in fig. 1' is formed, the flow rate of the accumulated plastics is very slow, thereby forming a merging color line, even if the plastics are accumulated for a long time, carbonization is easy, adhesiveness of the plastic after carbonization is strong, flow speed is slow, and the outflow period is uncontrollable, and the plastic can be unevenly flowed out in the production process, so that black spots are formed on the surface of the product, so that rejection rate of the product is improved, and efficiency of equipment replacement is seriously affected.
Disclosure of Invention
The utility model aims to solve the technical problem that the flow channel of the existing die head is easy to accumulate, and provides a die head which is characterized in that the cross section formed between the top surface and the side surface of the flow channel and between the inner wall and the top surface of the die head main body is replaced by an arc transition structure from a right-angle transition structure, so that the plastic flows more smoothly, the transition is smoother, and the accumulation of the plastic at the right angle position is avoided.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a first runner is arranged on the surface of a core rod of a hollow blow molding machine die head, the first runner is provided with a feeding end, the first runner downwards extends from the feeding end around the surface of the core rod, the top section of the first runner is upwards and inwards recessed to form an arc curved surface with low two ends and high middle, and the joint of the arc curved surface and the surface of the core rod forms a tip.
Compared with the prior art, the first flow channel top section is set to be an arc curved surface, the joint of the arc curved surface and the core rod surface forms the tip, when the core rod is matched with the inner hole of the die head main body, the tip is connected with the inner wall of the die head main body, so that the inner wall of the die head main body is connected with the top surface of the first flow channel in a smooth way, the top surface of the first flow channel and the side surface of the first flow channel form arc transitional connection, when plastic flows in from the feeding hole of the die head main body, the plastic can flow through the arc curved surface in a smooth way along the inner wall of the first flow channel, compared with the conventional flow channel adopting right angle transitional way, the plastic can flow more smoothly, the transition is smoother, the retention of the plastic at the right angle is avoided, the plastic flow speed is accelerated, the phenomenon of accumulation is avoided due to the fact that the plastic is too slow, the color and the color line is formed due to the deep color caused by overlong of the heating time is avoided, the carbonization phenomenon of the prior art caused by the stagnation of the plastic is avoided, the problem that black point is not caused when the existing product is avoided, and the product percent of pass is improved.
Further, the first flow channels extend from the feeding end around two opposite sides of the surface of the core rod respectively to form two sub flow channels which are oppositely arranged, the two sub flow channels are converged at the other opposite sides of the core rod, which are located at the feeding end, and the arrangement mode can improve the efficiency of plastic flow.
Further, the sub-runner comprises a horizontal section extending from the feeding end in a horizontal state around the surface of the core rod in a cladding mode, and an inclined arc section connected with the horizontal section and extending downwards around the surface of the core rod in an inclined arc mode, and the arrangement mode can enable plastic to flow more uniformly. Preferably, the arc curved surface is positioned above a part of the cross section of the horizontal section and is semicircular, so that the plastic can flow more uniformly in the horizontal section and flow more uniformly to the lower part of the core rod; preferably, the arc curved surface is located at a part of the oblique arc section, and the curvature radius of one side of the arc curved surface, which is connected with the surface of the mandrel, gradually increases along the extending direction of the first flow passage.
Further, a semicircular converging opening is formed at the intersection of the arc curved surfaces of the two sub-runners, and compared with a right-angle transition mode formed by the intersection and the inner wall of the die head main body of the existing runner, when plastics are converged from the two side sub-runners, the plastics can flow and converge along the radian of the converging opening, so that the plastics flow more smoothly and are difficult to accumulate and stagnate.
Further, the side surface of the first runner is in arc transition connection with the bottom surface above the side surface of the first runner, and the bottom surface of the first runner is in arc transition connection with the surface of the core rod, so that plastic flows more smoothly.
Further, two ways of setting the core rod are as follows.
As the first setting mode of plug, the external diameter of lower guide post is less than the external diameter of last guide post, lower guide post interval is equipped with a plurality of water conservancy diversion convex part, the upper and lower both sides of water conservancy diversion convex part ring is equipped with the connection lower guide post surface guide inclined plane, first flow path is seted up on the last guide post, this kind of setting mode can make plastics distribute more evenly in the die head main part to the tubulose plastics thickness that forms is more even.
As a second setting mode of the core rod, the outer diameter of the core rod gradually contracts from top to bottom, a second flow passage extending spirally along the surface of the core rod is arranged at the lower part of the core rod, the first flow passage is positioned at the junction of the two sub flow passages and is communicated with the upper end of the second flow passage, and the spirally extending second flow passage can enable plastics to be distributed around the core rod along the second flow passage, so that the plastics are distributed more uniformly in the die head main body, and the thickness of formed tubular plastics is more uniform.
Drawings
FIG. 1' is a schematic view of a prior art die core rod;
FIG. 1 is a perspective view of a mandrel;
FIG. 2 is a perspective view of the mandrel at a slight angle;
FIG. 3 is a cross-sectional view of a die;
FIG. 4 is a top view of the mandrel;
FIG. 5 is a section A-A of FIG. 4;
FIG. 6 is a section B-B of FIG. 4;
FIG. 7 is a perspective view of another design of the mandrel.
Detailed Description
The following describes specific embodiments of the present utility model with reference to the drawings. In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model.
Referring to fig. 1 to 3, the present embodiment provides a mandrel of a hollow blow molding machine die head, which includes a mandrel 200, the mandrel 200 is assembled in a die body 100 in use, a feed inlet 101 is provided at a side portion of the die body 100, a discharge outlet 102 is provided at a bottom portion of the die body, a first flow channel 1 is provided on a surface of the mandrel 200, the first flow channel 1 has a feed end 10 located at an upper portion of the mandrel 200, the feed end 10 is used for communicating with the feed inlet 101, and the first flow channel 1 extends downward from the feed end 10 around a surface of the mandrel 200.
Referring to fig. 3, the top surface of the first runner 1 is recessed from the feed end 10 toward the upper side in the extending direction of the first runner 1 to form a curved arc surface 2 with low ends and high middle, and the junction between the curved arc surface 2 and the surface of the mandrel 200 forms a tip 3.
Referring to fig. 1 and 2, the first flow channel 1 extends from the feeding end 10 around two opposite sides of the surface of the mandrel 200 respectively to form two sub flow channels 201 which are arranged oppositely, the two sub flow channels 201 are converged at two opposite sides of the mandrel 200 in the feeding end 10, and this arrangement can improve the efficiency of plastic flow, preferably, as shown in fig. 3, a semicircular converging opening 202 is formed at the intersection of the curved surfaces 2 of the two sub flow channels 201, compared with the right angle transition mode formed by the intersection of the existing flow channels and the inner wall of the die body 200, when the plastic is converged from the two sub flow channels 201 at the intersection, the plastic can flow and converge along the radian of the converging opening 202, so that the flow is smoother and is difficult to accumulate, and the plastic can smoothly converge at the converging opening 202, so that the overall flow velocity of the plastic in the first flow channel 1 is more uniform, and the dark color of the plastic due to the too slow flow velocity is avoided, and the converging line of the dark color is formed at the intersection of the plastic due to the too slow flow velocity, so that the converging line at the position of the plastic is reduced or eliminated.
Referring to fig. 2, the sub-runners 201 include horizontal sections 11 extending from the feed end 10 around the surface of the mandrel 200 in a horizontal state, and inclined arc sections 12 connecting the horizontal sections 11 and extending obliquely downward around the surface of the mandrel 200, the inclined arc sections 12 of the two side sub-runners 201 are joined to form a V-shaped structure, and the horizontal sections 11 of the two side sub-runners 201 form a ring-like structure, so that the plastic flow rate can be more uniform.
Referring to fig. 4 to 6, the section of the circular arc curved surface 2 located at the horizontal section 11 is semicircular, so that the plastic can flow more uniformly in the horizontal section 11 and flow more uniformly to the lower part of the mandrel 200, as an improvement scheme, the radius of curvature of the circular arc curved surface 2 located at the inclined arc section 12, which is connected with the surface side of the mandrel 200, gradually increases along the extending direction of the first flow channel 1, as shown in fig. 6 at positions R1 and R2, and the radius of curvature R2 of the circular arc curved surface 2 located at the inclined arc section 12 is larger than the radius of curvature R1 located at the horizontal section 11. This arrangement allows the plastic to flow more rapidly in the diagonal segment 12 to increase the rate of plastic flow from the diagonal segment 12 to the lower portion of the mandrel 200, further reducing or eliminating the knit line formed by the plastic at the junction.
Referring to fig. 2 and 3, the side surface of the first flow channel 1 is in arc transition connection with the bottom surface thereof, and the bottom surface of the first flow channel 1 is in arc transition connection with the surface of the mandrel 200, so that the plastic flows more smoothly.
The present embodiment provides two specific arrangements of the core rod 200.
Referring to fig. 1 to 3, as a first arrangement mode of the mandrel 200, the mandrel 200 includes an upper guide post 203 and a lower guide post 204, the outer diameter of the lower guide post 204 is smaller than that of the upper guide post 203, a plurality of guide protrusions 205 are spaced from the lower guide post 204, guide inclined planes 206 connecting the surfaces of the lower guide post 204 are annularly arranged on the upper and lower sides of the guide protrusions 205, and the first runner 1 is opened on the upper guide post 203.
Referring to fig. 7, as a second arrangement of the mandrel 200, the outer diameter of the mandrel 200 gradually decreases from top to bottom, a second flow channel 207 extending spirally along the surface of the mandrel 200 is provided at the lower portion of the mandrel 200, the first flow channel 1 is located at the junction of two sub-flow channels 201 thereof and is communicated with the upper end of the second flow channel 207, and the spirally extending second flow channel 207 can distribute the plastic around the mandrel 200 along the second flow channel 207, so that the plastic is distributed more uniformly in the die body 100, and the thickness of the formed tubular plastic is more uniform.
Compared with the prior art, the top surface of the first runner 1 is provided with the arc curved surface 2, the joint of the arc curved surface 2 and the surface of the mandrel 200 forms the tip 3, when the mandrel 200 is matched with the die head main body 100, the tip 3 is connected with the inner wall of the die head main body 100, so that the inner wall of the die head main body 100 is in smooth connection with the top surface of the first runner 1, the top surface of the first runner 1 and the side surface thereof form arc transition connection, when plastics flow in from the feed inlet 101 of the die head main body 100, the plastics can smoothly flow through the arc curved surface 2 along the inner wall of the first runner, compared with the conventional runner adopting right angle transition, the transition is smoother, the accumulation of plastics at corners is avoided, the speed of the plastic flow is accelerated, and the accumulation phenomenon is avoided greatly, so that plastics with different colors can be directly replaced during the production of equipment is accelerated, the carbonization phenomenon caused by long accumulation time in the prior art is avoided, the problem of black spots in the prior art is avoided, and the qualification rate of products is improved.
Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.
Claims (10)
1. A core rod of a hollow blow molding machine die head, which is characterized in that: the surface of plug (200) has seted up first runner (1), first runner (1) have feed end (10), first runner (1) is from feed end (10) are followed the surface downwardly extending of plug (200), the top surface of first runner (1) upwards side is sunken to form both ends low, middle part is high circular arc curved surface (2), circular arc curved surface (2) with the junction on plug (200) surface forms tip (3).
2. Mandrel according to claim 1, characterized in that the first flow channels (1) extend from the feed end (10) around opposite sides of the surface of the mandrel (200), respectively, forming two sub-flow channels (201) arranged opposite each other, which sub-flow channels (201) meet at opposite sides of the mandrel (200) at the feed end (10).
3. The mandrel as claimed in claim 2 wherein the sub-runner (201) comprises a horizontal segment (11) extending from the feed end (10) in a horizontal wrapping around the surface of the mandrel (200), and a sloped arcuate segment (12) engaging the horizontal segment (11) and extending diagonally downward around the surface of the mandrel (200).
4. A mandrel as claimed in claim 3 in which the curved surface (2) is semi-circular above a part of the cross section of the horizontal segment (11).
5. A mandrel as claimed in claim 3 in which the radius of curvature of the portion of the curved surface (2) located in the obliquely curved section (12) on the side of the surface which engages the mandrel (200) increases progressively in the direction of extension of the first flow channel (1).
6. A mandrel as claimed in claim 3 in which the arcuate surfaces (2) of the two sub-channels (201) meet to form a semicircular collection opening (202).
7. Mandrel according to any one of claims 1 to 6, characterised in that the side of the first flow channel (1) is in a circular arc transition with its upper bottom.
8. The mandrel as claimed in claim 7 wherein the bottom surface above the first flow channel (1) is in a circular arc transition with the surface of the mandrel (200).
9. The mandrel as claimed in any one of claims 1 to 6, wherein the mandrel (200) comprises an upper guide post (203) and a lower guide post (204), the outer diameter of the lower guide post (204) is smaller than that of the upper guide post (203), a plurality of guide protrusions (205) are arranged at intervals on the lower guide post (204), guide inclined planes (206) which are connected with the surfaces of the lower guide post (204) are annularly arranged on the upper and lower sides of the guide protrusions (205), and the first flow channel (1) is arranged on the upper guide post (203).
10. The mandrel as claimed in claim 2, wherein the outer diameter of the mandrel (200) gradually decreases from top to bottom, a second flow passage (207) spirally extending along the surface of the mandrel (200) is provided at the lower portion of the mandrel (200), and the first flow passage (1) is located at the junction of two sub-flow passages (201) thereof and is communicated with the upper end of the second flow passage (207).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321331414.3U CN219789211U (en) | 2023-05-29 | 2023-05-29 | Core rod of hollow blow molding machine die head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321331414.3U CN219789211U (en) | 2023-05-29 | 2023-05-29 | Core rod of hollow blow molding machine die head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219789211U true CN219789211U (en) | 2023-10-03 |
Family
ID=88187472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321331414.3U Active CN219789211U (en) | 2023-05-29 | 2023-05-29 | Core rod of hollow blow molding machine die head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219789211U (en) |
-
2023
- 2023-05-29 CN CN202321331414.3U patent/CN219789211U/en active Active
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