Center air exhaust type plastic pipe extrusion die runner

Abstract

The utility model discloses a center air exhaust type plastic pipe extrusion die runner, and belongs to the technical field of plastic pipe extrusion. The device comprises a mold and an extruder screw barrel, the splitter plate is arranged between the mold and the extruder screw machine barrel, the splitter plate is connected with the extruder screw machine barrel through a first connecting body, the splitter plate is connected with the mold through a second connecting body, the mold is provided with an exhaust pipe in the direction of the central axis of the mold, and the second connecting bodies are arranged in the circumferential direction of the exhaust pipe; and a plastic melt extruded by the screw barrel of the extruder is shunted by the shunting plate and then enters the mold along the second connecting body. According to the mold runner layout, the center air exhaust function is ensured to be achieved, uniform filling of melt plastic in the mold is also considered, the extrusion molding process is optimized, and the product quality and the production efficiency can be improved easily.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic pipe extrusion, and in particular relates to a central air extraction type plastic pipe extrusion die flow channel. Background Art

[0002] During the extrusion process of plastic pipes, the plastic raw materials are extruded by an extruder and fed into a mold, and then the molded high-temperature pipes are produced from the mold. In order to speed up the cooling of the inner wall of the pipe, an exhaust pipe is generally set to extract the high-temperature gas inside the pipe from the mold to the outside. However, due to the limitation of the mold feeding method, the arrangement of the exhaust pipe will be interfered. Among them, the common mold feeding methods are as follows:

[0003] 1. End face center feeding: In this feeding method, the inlet of the mold is directly located in the center of the end face, the plastic melt enters the mold from the center, and the exhaust pipe is arranged between the radial flow channels around this center point. However, due to limited space, the cross-sectional area of ​​the exhaust channel is relatively small, which may lead to low exhaust efficiency, affecting the cooling speed and the internal quality of the pipe;

[0004] 2. Side (right angle) feeding: This method allows feeding from one side of the mold at a right angle, so that an exhaust pipe can be set in the center area of ​​the mold to achieve more effective central exhaust. However, side feeding may cause uneven flow of the melt in the mold, especially when the extrusion volume is large, the pressure loss and flow rate change of the melt at the corner may cause uneven pipe wall thickness or unstable extrusion;

[0005] 3. Eccentric feeding: The eccentric feeding method attempts to combine the advantages of central exhaust, but the position where the melt enters the mold is off-center, which also leads to a decrease in the balance of the flow channel. Although it is also possible to leave a central space for the exhaust pipe after eccentric feeding, due to the asymmetry of the melt flow path, it is difficult to have compatibility with plastic raw materials with different melt indexes or large differences in fluidity. Summary of the invention

[0006] The utility model aims at the above problems existing in the prior art and proposes a central air-extraction type plastic pipe extrusion die flow channel with high air-extraction efficiency and strong compatibility.

[0007] The utility model can be realized through the following technical solutions:

[0008] A central suction type plastic pipe extrusion die flow channel, comprising:

[0009] Dies and extruder screw barrels;

[0010] A splitter plate is arranged between the die and the extruder screw barrel, the splitter plate and the extruder screw barrel are connected via a first connector, and the splitter plate and the die are connected via a second connector, wherein:

[0011] The mold is provided with an exhaust pipe along its central axis, and a plurality of second connectors are provided and arranged circumferentially around the exhaust pipe. The plastic melt extruded by the extruder screw barrel is diverted by the diverter plate and then enters the mold along the second connector.

[0012] As a further improvement of the utility model, the extruder screw barrel is supported by a bracket so that the extruder screw barrel and the mold are located on the same central axis.

[0013] As a further improvement of the utility model, a plurality of evenly distributed flow channels are provided inside the diverter plate.

[0014] As a further improvement of the present invention, the number of the flow channels is the same as the number of the second connectors, and each of the flow channels is connected one by one with each of the second connectors.

[0015] As a further improvement of the present invention, each of the flow channels has the same feed port, and the feed port is connected to the extruder screw barrel through the first connector.

[0016] As a further improvement of the present invention, the exhaust pipe extends from the end of the mold and is bent, and the bent exhaust pipe passes between two adjacent second connectors.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The mold runner layout not only ensures the realization of the central air extraction function, but also takes into account the uniform filling of the molten plastic in the mold, optimizes the extrusion molding process, and helps to improve product quality and production efficiency;

[0019] 2. Due to the arrangement of the manifold and the second connector, the exhaust pipe can be arranged on the central axis of the mold, so as to achieve the purpose of central exhaust, expand the area of ​​the exhaust channel, and improve the cooling effect on the inner wall of the pipe, thereby improving the product quality of the final plastic pipe;

[0020] 3. Multiple second connectors are arranged circumferentially around the exhaust pipe. After the plastic melt is extruded from the screw barrel of the extruder, it will reach the diverter plate, and pass through multiple evenly distributed flow channels inside the diverter plate for effective and balanced diversion. After even diversion, this diversion design allows the melt to flow smoothly and evenly into various parts of the mold along the second connectors connected to the flow channels, thereby effectively solving the problem of uneven flow and inconsistent pipe wall thickness that may exist in traditional flow channel design, ensuring the quality and consistency of the pipe during the molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the flow channel of the central air extraction plastic pipe extrusion die of the utility model;

[0022] Figure 2 The utility model Figure 1 Section view along AA;

[0023] Figure 3 The utility model Figure 1 Section view along BB.

[0024] In the figure, 100, mold; 110, extruder screw barrel; 120, splitter plate; 121, flow channel; 122, feed port; 130, first connector; 140, second connector; 150, exhaust pipe; 160, bracket. DETAILED DESCRIPTION

[0025] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0026] like Figure 1-3 As shown, the utility model provides a central suction type plastic pipe extrusion die flow channel, comprising:

[0027] A mold 100 and an extruder screw barrel 110;

[0028] The splitter plate 120 is disposed between the mold 100 and the extruder screw barrel 110. The splitter plate 120 and the extruder screw barrel 110 are connected via a first connector 130, and the splitter plate 120 and the mold 100 are connected via a second connector 140.

[0029] The mold 100 is provided with an exhaust pipe 150 along its central axis direction. A plurality of second connectors 140 are provided and arranged circumferentially around the exhaust pipe 150. The plastic melt extruded by the extruder screw barrel 110 is evenly diverted by the diverter plate 120 and flows through each second connector 140 and enters the mold 100.

[0030] It is worth mentioning here that, due to the arrangement of the manifold 120 and the second connector 140, the exhaust pipe 150 can be arranged on the central axis of the mold 100, so as to achieve the purpose of central exhaust, expand the area of ​​the exhaust channel, and improve the cooling effect on the inner wall of the pipe, thereby improving the product quality of the final plastic pipe;

[0031] In addition, the feeding method of the mold 100 is multi-point end face feeding, and multiple second connectors 140 are arranged circumferentially around the exhaust pipe 150. When the plastic melt is extruded from the extruder screw barrel 110, it will reach the diverter plate 120, and pass through multiple evenly distributed flow channels 121 inside the diverter plate 120 for effective and balanced diversion. After uniform diversion, this diversion design allows the melt to flow smoothly and evenly into the flow channel inside the mold 100 along each second connector 140 connected to the flow channel 121, thereby effectively solving possible problems such as uneven flow, inconsistent pipe wall thickness or difficulty in molding.

[0032] In general, the mold flow channel layout of the present application not only ensures the realization of the central vacuum function, but also takes into account the uniform filling of the molten plastic in the mold 100, optimizes the extrusion molding process, and helps to improve the quality of pipe products and production efficiency.

[0033] Preferably, the extruder screw barrel 110 is supported by a bracket 160 so that the extruder screw barrel 110 and the mold 100 are located on the same central axis, thereby improving the rigidity of the system.

[0034] Preferably, a plurality of evenly distributed flow channels 121 are provided inside the diverter plate 120, and the number of the flow channels 121 is the same as the number of the second connectors 140, and each flow channel 121 is connected one by one with each second connector 140, so that the melt output from the extruder screw barrel 110 can be reasonably distributed to different areas of the mold 100 through the diverter plate 120, effectively avoiding the problem of uneven wall thickness caused by the imbalance of the flow channel 121.

[0035] Preferably, each flow channel 121 has the same feed port 122, and the feed port 122 is connected to the extruder screw barrel 110 through the first connector 130. The plastic melt extruded by the extruder screw barrel 110 flows into the feed port 122 of the diverter plate 120 through the first connector 130, and then is evenly diverted to each flow channel 121, and flows into the flow channel in the mold 100 through each second connector 140.

[0036] Preferably, the exhaust pipe 150 extends from the end of the mold 100 and is bent, so that the exhaust pipe 150 can pass between two adjacent second connectors 140, thereby ensuring the exhaust efficiency and taking into account the balance of the design of the flow channel system of the entire mold 100.

[0037] The technical means disclosed in the scheme of the utility model are not limited to the technical means disclosed by the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is a specific implementation method of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A central suction plastic pipe extrusion die flow channel, characterized in that: include: Dies and extruder screw barrels; A splitter plate is arranged between the mold and the extruder screw barrel, the splitter plate and the extruder screw barrel are connected via a first connector, and the splitter plate and the mold are connected via a second connector, wherein: The mold is provided with an exhaust pipe along its central axis, and a plurality of second connectors are provided and arranged circumferentially around the exhaust pipe. The plastic melt extruded by the extruder screw barrel is diverted by the diverter plate and then enters the mold along the second connector.

2. A central suction plastic pipe extrusion die flow channel according to claim 1, characterized in that: The extruder screw barrel is supported by a bracket so that the extruder screw barrel and the mold are located on the same central axis.

3. A central suction plastic pipe extrusion die flow channel according to claim 1, characterized in that: A plurality of evenly distributed flow channels are arranged inside the diverter plate.

4. A central suction plastic pipe extrusion die flow channel according to claim 3, characterized in that: The number of the flow channels is the same as the number of the second connectors, and each of the flow channels is connected one-to-one with each of the second connectors.

5. The central suction type plastic pipe extrusion die flow channel according to claim 3, characterized in that: Each of the flow channels has a same feed port, and the feed port is connected to the extruder screw barrel through the first connector.

6. A central suction plastic pipe extrusion die flow channel according to claim 1, characterized in that: The exhaust pipe extends from the end of the mold and is bent, and the bent exhaust pipe passes between two adjacent second connectors.

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