Two-section type inflation through hole

Abstract

The utility model relates to the technical field of blowing equipment, in particular to a two-section type blowing through hole, which comprises an original blowing die through hole section I, a PTFE (polytetrafluoroethylene) material through hole section II and an adjusting structure for finely adjusting the distance between the original blowing die through hole section I and a heating area, and the original blowing die through hole section I and the PTFE material through hole section II are sequentially distributed from near to far away from a blank inlet and are coaxially spliced. One section of the through hole of the original blowing mold is used for rapidly transferring heat of an external heating device to the inner wall softening mold blank; and the PTFE through hole second section is used for rapidly cooling the blown blank and preventing the blank from being adhered to the inner wall of the hole. By changing the design of the through hole of the blowing mold, changing one-section through hole into two-section through hole and adding polytetrafluoroethylene to the rear end of the original alloy material through hole, the friction force of the rear ends of a parison and the through hole is reduced, and the problems that when the parison passes through blowing equipment, the friction force of the parison and the through hole is increased, the parison is easy to deform and damage, and the product quality is influenced can be effectively solved. And the problems of incomplete inflation of the parison and low yield caused by small inflation pressure are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of inflation equipment, in particular to a two-stage inflation through hole. Background Art

[0002] Blowing equipment typically consists of an extrusion system, a blowing system, a control system (controlling temperature, pressure, and motion), and a cooling system. The material enters the barrel and, driven by the rotating screw, undergoes heating, plasticization, and mixing before being extruded from the die head to form a preform. During the blowing process, compressed air enters the nozzle through an air pipe. The nozzle then injects air into the preform, causing it to expand under the action of the air pressure and cling to the walls of the through-hole cavity, ultimately forming the desired product shape.

[0003] During the blow molding process, due to slight fluctuations in the size of the extruded parison and the mold temperature, low blowing pressure can lead to incomplete inflation in thicker areas of the parison. However, increasing the blowing pressure can increase friction as the parison passes through the through-holes of the blow molding mold, making it more susceptible to deformation and breakage during stretching. Utility Model Content

[0004] In view of this, the utility model provides a two-stage blowing through-hole, which aims to solve the problem that when the mold parison passes through the blowing equipment, high blowing pressure will cause increased friction between the mold parison and the through-hole, and the mold parison is easily deformed and damaged, while low blowing pressure will cause incomplete blowing of the mold parison and low yield.

[0005] In order to solve the above problems, the utility model provides a two-stage blowing through hole, including an original blowing mold through hole section and a PTFE material through hole section, which are coaxially spliced ​​and distributed in sequence from near to far from the mold blank entrance, and an adjustment structure for fine-tuning the distance between the original blowing mold through hole section and the heating area; the original blowing mold through hole section is a high thermal conductivity pipe fitting, which is used to quickly transfer the heat of the external heating device to the inner wall to soften the mold blank; the PTFE material through hole section is a low thermal conductivity and low friction coefficient pipe fitting, which is used to quickly cool the inflated mold blank and prevent it from adhering to the inner wall of the hole.

[0006] Optionally, the first section of the through hole of the original inflation mold and the second section of the through hole of the PTFE material are screwed together by means of internal and external threads.

[0007] Optionally, the inner wall of the first through-hole section of the original inflation mold and the inner wall of the second through-hole section made of PTFE material are seamlessly and smoothly connected.

[0008] Optionally, the adjustment structure includes a locking buckle, which is sleeved on the outer wall of a section of the through hole of the original blowing mold, and the locking buckle is used to resist the heating device of the blowing equipment.

[0009] Optionally, the position of the locking buckle against the heating device is adjustable.

[0010] Optionally, the relative position of the first section of the through hole of the original blowing mold and the locking buckle is adjustable.

[0011] Optionally, the first section of the original blowing mold through hole and the second section of the PTFE material through hole have facing end surfaces that are tightly connected, and the first section of the original blowing mold through hole and the second section of the PTFE material through hole are connected via a flange pair.

[0012] Optionally, the adjustment structure includes a set screw and a threaded hole provided on the flange pair, and the set screw is provided in the threaded hole and abuts against the heating device.

[0013] The technical solution of the utility model has the following advantages:

[0014] 1. By changing the through-hole design of the inflation mold from a one-stage to a two-stage through-hole, and adding polytetrafluoroethylene (PTFE) at the rear end of the original alloy through-hole, the friction between the mold parison and the rear end of the through-hole is reduced, which can effectively solve the problem of unstable inflation of the mold parison and improve output efficiency.

[0015] 2. Taking advantage of the significant difference in thermal conductivity between the alloy and PTFE materials in the first section of the original blow mold through-hole, this case uses a two-section threaded spliced ​​through-hole. When the parison passes through the first section of the original blow mold through-hole, the heat from the external heating device can be quickly transferred to the inner wall, softening the parison. After the parison is inflated and shaped, it enters the second section of the PTFE through-hole. Because PTFE has low thermal conductivity and low friction coefficient, the inflated parison can quickly cool down and does not adhere to the inner wall of the PTFE material.

[0016] 3. Since the device in the heating area of ​​the blowing equipment is an annular hollow heating ring, the position of the locking buckle against the annular hollow heating ring can be adjusted by adjustment, and the relative position of the heating area and the first section of the original blowing mold through hole and the second section of the PTFE material through hole can be controlled, so as to quickly find the best blowing position of the parison. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a structural comparison diagram of the inflation hole before and after the modification in the embodiment of the utility model.

[0019] Figure 2 It is a schematic diagram of the adjustment structure in other embodiments of the present utility model.

[0020] In the figure: the original inflation mold through hole section 1, the PTFE material through hole section 2, the mold blank entrance 3, the internal and external threads 4, the locking clip 5, the flange pair 6, and the set screw 7. DETAILED DESCRIPTION

[0021] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the description of the present invention, all other embodiments derived by persons of ordinary skill in the art without inventive effort are also within the scope of protection of the present invention.

[0022] Unless otherwise specified or limited, the terms "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances.

[0023] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the utility model.

[0024] The terms "first," "second," "third," etc. are merely used to distinguish between elements of similar nature and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0026] Please refer to Figure 1An embodiment of the utility model provides a two-stage blowing through hole, including a coaxially connected original blowing mold through hole section 1 and a PTFE material through hole section 2, wherein the original blowing mold through hole section 1 is a retained portion of the original integral alloy material through hole on the blowing equipment, and a mold parison inlet 3 is set at one end of the original integral alloy material through hole, and the mold parison inlet 3 is located in the heating area of ​​the blowing equipment. After a portion of the original integral alloy material through hole away from the mold parison inlet 3 is cut off, the PTFE material through hole section 2 is connected at the cutoff point.

[0027] The material selection for the original blow mold through-hole can be aluminum alloy, structural steel, stainless steel, or beryllium copper alloy. Structural steel can be selected from low-carbon steel, medium-carbon steel, medium-carbon alloy steel, high-carbon steel, or high-carbon alloy steel. The first section of the original blow mold through-hole (1) is a high-thermal conductivity pipe (with a thermal conductivity of at least 10 W / (m·K)), which quickly transfers heat from the external heating device to the inner wall to soften the parison. The second section (2) of the through-hole is a PTFE pipe with low thermal conductivity (0.25-0.3 W / (m·K)) and low friction coefficient (dynamic friction coefficient of 0.04-0.08), which quickly cools the inflated parison and prevents it from adhering to the inner wall of the hole.

[0028] The two-stage blowing through hole proposed in the embodiment of the present invention changes the design of the through hole of the blowing mold from a one-stage through hole to a two-stage through hole, and adds a low thermal conductivity and low friction coefficient pipe through hole at the rear end of the original high thermal conductivity pipe through hole, thereby reducing the friction between the rear end of the mold blank and the through hole, effectively solving the problem of unstable inflation of the mold blank and improving output efficiency.

[0029] Furthermore, the original blow mold through-hole section 1 is made of alloy, while the PTFE through-hole section 2 is made of polytetrafluoroethylene (PTFE). Taking advantage of the significant difference in thermal conductivity between alloy and PTFE, this design employs a two-stage threaded through-hole. As the parison passes through the original blow mold through-hole section 1, heat from the external heating device is quickly transferred to the inner wall, softening the parison. After the parison is inflated and shaped, it enters the PTFE through-hole section 2. Because PTFE has low thermal conductivity and low friction coefficient, the inflated parison cools quickly and does not adhere to the inner wall of the PTFE.

[0030] Furthermore, the two-stage inflation hole also includes an adjustment structure for fine-tuning the distance between the first section 1 of the original inflation mold through hole and the heating area. The adjustment structure includes a locking clip 5, which is sleeved onto the outer wall of the first section 1 of the original inflation mold through hole. The locking clip 5 is used to abut the heating device of the inflation device, and the position of the locking clip 5 against the heating device is adjustable. Because the inflation device's heating device is an annular hollow heating coil, the position of the locking clip 5 against the heating device can be adjusted. This can control the relative position of the heating area to the first section 1 of the original inflation mold through hole and the second section 2 of the PTFE material through hole, facilitating quick identification of the optimal inflation position for the parison.

[0031] The above is achieved by relatively fixing the locking buckle 5 and the first section 1 of the through hole of the original blowing mold, so that the relative position of the two remains unchanged, and the two are adjusted synchronously as a whole. When the position of the locking buckle 5 against the heating device changes, the position of the first section 1 of the through hole of the original blowing mold relative to the heating device changes accordingly.

[0032] In other embodiments, the relative position of the original blowing mold through hole section 1 and the locking buckle 5 can also be adjusted, thereby adjusting the relative position of the original blowing mold through hole section 1 and the heating device; when adjusting, first loosen the locking buckle 5 so that the locking buckle 5 can move along the axial direction of the original blowing mold through hole section 1, and after fine-tuning the locking buckle 5 to the specified position, re-tighten the locking buckle 5 and make the locking buckle 5 press against the original position of the heating device. When the position of the locking buckle 5 pressing against the heating device remains unchanged, the relative position of the locking buckle 5 and the original blowing mold through hole section 1 changes, that is, the relative position of the original blowing mold through hole section 1 and the heating device changes, thereby achieving the adjustment purpose.

[0033] Specifically, the original blowing mold through hole section 1 and the PTFE material through hole section 2 are screwed together by internal and external threads 4, and the inner wall of the original blowing mold through hole section 1 and the inner wall of the PTFE material through hole section 2 are seamlessly and smoothly connected at the junction.

[0034] Please refer to Figure 2In other embodiments, the facing ends of the original blowing mold through hole section 1 and the PTFE material through hole section 2 are not provided with threaded threads, but are provided with flat end surfaces. The outer side walls of the facing ends of the original blowing mold through hole section 1 and the PTFE material through hole section 2 are protrudingly provided with a flange pair 6. By tightening a circle of bolts on the flange pair 6, the facing end faces of the original blowing mold through hole section 1 and the PTFE material through hole section 2 are pressed and coaxially connected; in the embodiment with the flange pair 6, the adjustment structure cancels the design of the locking buckle 5, and the adjustment structure is provided on the flange pair 6. The adjustment structure includes a set screw 7 and a threaded hole. The flange pair 6 is evenly spaced around the periphery to form at least two threaded holes. The central axis of the threaded hole is parallel to the central axis of the original blowing mold through hole section 1. The set screw 7 is provided in the threaded hole and abuts against the heating device. When adjusting, all the set screws 7 are rotated to the same angle and number of turns to achieve the relative position adjustment of the original blowing mold through hole section 1 and the heating device.

[0035] The above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A two-stage inflation hole, characterized in that: It includes a first section of the original blowing mold through hole and a second section of PTFE material through hole, which are coaxially spliced ​​and distributed in sequence from near to far from the entrance of the mold blank, as well as an adjustment structure for fine-tuning the distance between the first section of the original blowing mold through hole and the heating area; the first section of the original blowing mold through hole is used to quickly transfer the heat of the external heating device to the inner wall to soften the mold blank; the second section of the PTFE material through hole is used to quickly cool the inflated mold blank and prevent it from adhering to the inner wall of the hole.

2. The two-stage inflation hole according to claim 1, characterized in that: The first through hole section of the original inflation mold and the second through hole section of the PTFE material are screwed together by means of internal and external threads.

3. The two-stage inflation hole according to claim 1, characterized in that: The inner wall of the first through-hole section of the original inflation mold and the inner wall of the second through-hole section made of PTFE material are seamlessly and smoothly connected at the junction.

4. The two-stage inflation hole according to claim 1, characterized in that: The adjustment structure includes a locking buckle, which is sleeved on the outer wall of a section of the through hole of the original blowing mold, and is used to resist the heating device of the blowing equipment.

5. The two-stage inflation hole according to claim 4, characterized in that: The position where the locking buckle abuts against the heating device is adjustable.

6. The two-stage inflation hole according to claim 4, characterized in that: The relative position of the first section of the through hole of the original blowing mold and the locking buckle is adjustable.

7. The two-stage inflation hole according to claim 1, characterized in that: The end faces of the first section through hole of the original blowing mold and the second section through hole of the PTFE material are tightly connected, and the first section through hole of the original blowing mold and the second section through hole of the PTFE material are connected via a flange pair.

8. The two-stage inflation hole according to claim 7, characterized in that: The adjusting structure includes a set screw and a threaded hole provided on the flange pair. The set screw is provided in the threaded hole and abuts against the heating device.

Images