Pipe extrusion die with double-channel air draft function

Abstract

The utility model discloses a double-channel air draft pipe extrusion die, and belongs to the technical field of plastic pipe extrusion. Comprising a core mold assembly; the central exhaust pipe is arranged in the central axis direction of the core mold assembly and is used for extracting heat in the pipe outwards so as to cool the inner wall of the pipe; the air inlet pipe and the central exhaust pipe are coaxially arranged, a distance is reserved between the inner wall of the air inlet pipe and the outer wall of the central exhaust pipe, an air inlet channel is formed between the inner wall of the air inlet pipe and the outer wall of the central exhaust pipe, and meanwhile, an in-mold cooling channel is formed between the outer wall of the air inlet pipe and the inner wall of the core mold combination body; and the air inlet channel communicates with the in-mold cooling channel and is used for extracting heat in the core mold combination body outwards so as to cool the inner wall of the core mold combination body. A multi-air-duct structure is arranged in limited workpieces in the die in a balanced manner, so that air draft cooling of the inner wall of a pipe can be realized through the central air draft pipe, air draft cooling of the inner wall of a core die assembly can also be realized through the air inlet pipe and the cooling channel in the die, and the product quality and the extrusion efficiency are better ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic pipe extrusion, and particularly relates to a pipe extrusion die with double-channel air extraction. Background Art

[0002] Generally, the conventional pipe extrusion die adopts the feeding method of central cross-section, which cannot realize the large-channel air extraction cooling of the inner wall of the pipe, nor can it realize the large-channel air extraction cooling of the inner wall of the die.

[0003] In addition, the current large dies mainly rely on the mold temperature controller to control the mold temperature, which has the problems of high energy consumption and high cost; while the small dies only rely on the small-channel air extraction cooling, resulting in the inability to stabilize the mold temperature, affecting the product quality and extrusion efficiency. Summary of the Utility Model

[0004] The utility model aims at the above problems existing in the prior art, and provides a pipe extrusion die with double-channel air extraction, which can perform air extraction cooling on the inner wall of the pipe and the inner wall of the die.

[0005] The utility model can be realized by the following technical solutions:

[0006] A pipe extrusion die with double-channel air extraction, comprising:

[0007] A mandrel assembly for extruding pipes;

[0008] A central air extraction pipe arranged along the central axis direction of the mandrel assembly and extending outwards, the central air extraction pipe is used to extract the heat inside the pipe to cool the inner wall of the pipe;

[0009] An air inlet pipe coaxially arranged with the central air extraction pipe, with a distance left between the inner wall of the air inlet pipe and the outer wall of the central air extraction pipe to form an air inlet channel, and at the same time, an in-mold cooling channel is formed between the outer wall of the air inlet pipe and the inner wall of the mandrel assembly. The air inlet channel is connected to the in-mold cooling channel and is used to extract the heat inside the mandrel assembly to cool the inner wall of the mandrel assembly.

[0010] As a further improvement of the utility model, a first end plate is arranged on the cross-section of the feeding end of the mandrel assembly, and the first end plate abuts against the outer wall of the air inlet pipe.

[0011] As a further improvement of the utility model, it further includes a circumferential air extraction pipe installed on the first end plate and connected to an external variable-frequency suction fan, and the outlet end of the in-mold cooling channel is connected to the circumferential air extraction pipe.

[0012] As a further improvement of the present utility model, a plurality of circumferential air extraction pipes can be provided and evenly distributed, and each of the circumferential air extraction pipes converges and is connected to an external variable-frequency air suction fan.

[0013] As a further improvement of the present utility model, it further includes a second end plate, which can be arranged on the cross section of the discharge end of the core mold assembly or in the annular space close to the inner side of the cross section of the discharge end of the core mold assembly, and the second end plate abuts against the outer wall of the central air extraction pipe.

[0014] As a further improvement of the present utility model, there is a distance between the air outlet end of the air inlet pipe and the second end plate to form a ventilation gap, and the air inlet pipe is communicated with the in-mold cooling channel through the ventilation gap.

[0015] As a further improvement of the present utility model, a temperature sensor is provided on the inner wall of the core mold assembly, and the control system controls the motor speed of the external variable-frequency air suction fan through the temperature detected by the temperature sensor to adjust the air volume.

[0016] As a further improvement of the present utility model, it further includes a flow dividing plate and a connecting member. The feeding end of the flow dividing plate is connected to an external screw extruder, and the discharging end of the flow dividing plate is connected to the core mold assembly through the connecting member.

[0017] As a further improvement of the present utility model, an avoidance space is formed between the flow dividing plate and the feeding end face of the core mold assembly through the connecting member, and the central air extraction pipe and the circumferential air extraction pipes bend and extend outwards from the avoidance space.

[0018] As a further improvement of the present utility model, a flow guiding plate is installed at the air inlet end of the central air extraction pipe, and a flow guiding channel is provided inside the flow guiding plate, and the air inlet end of the flow guiding channel extends to a position close to the inner wall of the pipe.

[0019] Compared with the prior art, the present utility model has the following beneficial effects:

[0020] 1. The pipe extrusion die of the present application evenly arranges a multi-air duct structure in the limited space inside the mold. It can not only realize the air extraction cooling of the inner wall of the pipe through the central air extraction pipe, but also realize the air extraction cooling of the inner wall of the core mold assembly through the air inlet pipe and the in-mold cooling channel, better ensuring the product quality and extrusion efficiency;

[0021] 2. The central air extraction pipe and the air inlet pipe are independent of each other and are respectively connected to an external central air extraction fan and a variable-frequency air suction fan, thereby realizing independent cooling control of the inner wall of the pipe and the inner wall of the core mold assembly;

[0022] 3. By controlling the air extraction cooling of the core mold assembly to replace the mold temperature control by the mold temperature machine, the energy consumption and cost are greatly reduced.

[0023] 4. The purpose of central air extraction is achieved through the settings of the flow splitter plate and the connecting piece, the area of the air extraction channel is enlarged, the cooling effect is improved, and finally the product quality of the pipe is enhanced.

[0024] 5. A flow guide plate is installed at the air inlet end of the central air extraction pipe. The flow guide plate has a flow guide channel inside. The air inlet end of the flow guide channel extends to a position close to the inner wall of the pipe. Through the setting of the flow guide plate, the hot air inside the pipe can be made to flow along the inner wall of the pipe and be sucked into the flow guide channel, and finally be drawn out along the central air extraction pipe, thereby improving the cooling effect on the inner wall of the pipe. Description of the Drawings

[0025] Figure 1 is a cross-sectional view of the pipe extrusion die with dual-channel air extraction of the present utility model.

[0026] In the figure, 100 is the mandrel assembly; 110 is the central air extraction pipe; 120 is the air inlet pipe; 121 is the air inlet channel; 122 is the in-mold cooling channel; 123 is the ventilation gap; 130 is the first end plate; 140 is the circumferential air extraction pipe; 150 is the second end plate.

[0027] 200 is the flow splitter plate; 210 is the flow splitter plate.

[0028] 300 is the flow guide plate; 310 is the flow guide channel. Detailed Embodiments

[0029] The following are specific embodiments of the present utility model in combination with the drawings, and the technical methods of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0030] As Figure 1 shown, the present utility model provides a pipe extrusion die with dual-channel air extraction, including:

[0031] A mandrel assembly 100 for extruding pipes;

[0032] A central air extraction pipe 110 arranged along the central axis direction of the mandrel assembly 100 and extending outward. The central air extraction pipe 110 is used to extract the heat inside the pipe to cool the inner wall of the pipe.

[0033] An air inlet pipe 120 coaxially arranged with the central air extraction pipe 110. There is a distance between the inner wall of the air inlet pipe 120 and the outer wall of the central air extraction pipe 110 to form an air inlet channel 121. At the same time, an in-mold cooling channel 122 is formed between the outer wall of the air inlet pipe 120 and the inner wall of the mandrel assembly 100. The air inlet channel 121 is connected to the in-mold cooling channel 122 and is used to extract the heat inside the mandrel assembly 100 to cool the inner wall of the mandrel assembly 100.

[0034] That is to say, in the pipe extrusion die provided in this embodiment, a multi-air duct structure is evenly arranged within the limited workpieces in the die. It can not only achieve the air extraction and cooling of the inner wall of the pipe through the central air extraction pipe 110, but also achieve the air extraction and cooling of the inner wall of the mandrel assembly 100 through the air inlet pipe 120 and the cooling channels 122 in the die, better ensuring the product quality and extrusion efficiency.

[0035] In addition, the central air extraction pipe 110 and the air inlet pipe 120 are independent of each other and are respectively connected to the external central air extraction fan and the variable-frequency suction fan, thereby realizing the independent cooling control of the inner wall of the pipe and the inner wall of the mandrel assembly 100.

[0036] And by controlling the air extraction and cooling of the mandrel assembly 100 to replace the mold temperature control by the mold temperature machine, the energy consumption and cost are greatly reduced.

[0037] Preferably, a first end plate 130 is arranged on the cross-section of the feeding end of the mandrel assembly 100. The first end plate 130 abuts against the outer wall of the air inlet pipe 120 to position and support the air inlet pipe 120.

[0038] Furthermore, it further includes a circumferential air extraction pipe 140, which is installed on the first end plate 130 and is connected to the external variable-frequency suction fan. The outlet end of the cooling channels 122 in the die is communicated with the circumferential air extraction pipe 140. Among them, a temperature sensor is further arranged on the inner wall of the mandrel assembly 100. The control system controls the motor speed of the external variable-frequency suction fan through the temperature detected by the temperature sensor, and then adjusts the air volume of the variable-frequency suction fan;

[0039] Specifically, when the temperature sensor detects that the temperature of the mandrel is higher than the set value, the control system controls the variable-frequency suction fan to start. Normal temperature air enters the cooling channels 122 in the die through the air inlet channel 121, absorbs the heat of the inner wall of the mandrel assembly 100, and the hot air is discharged through the circumferential air extraction pipe 140, realizing the cooling of the inner wall of the mandrel assembly 100.

[0040] Among them, the rotation speed (i.e., the air suction volume) of the variable-frequency suction fan can be automatically adjusted according to the temperature detected by the temperature sensor, thereby realizing the stable control of the temperature in the die and ensuring the pipe extrusion quality and extrusion efficiency.

[0041] Preferably, the number of the circumferential air extraction pipes 140 can be set to multiple and evenly distributed. Each circumferential air extraction pipe 140 converges and is connected to the external variable-frequency suction fan, thereby ensuring the uniformity of the air extraction and cooling in the die and avoiding the occurrence of insufficient local cooling.

[0042] Preferably, it further includes a second end plate 150, which can be arranged on the cross-section at the discharging end of the core mold assembly 100 or on the annular space close to the inner side of the cross-section at the discharging end of the core mold assembly 100. The second end plate 150 abuts against the outer wall of the central air extraction pipe 110 to position and support the central air extraction pipe 110.

[0043] Preferably, there is a distance between the air outlet end of the air inlet pipe 120 and the second end plate 150 to form a ventilation gap 123. The air inlet pipe 120 is communicated with the in-mold cooling channel 122 through the ventilation gap 123. Among them, setting the ventilation gap 123 at the position where the air outlet end of the air inlet pipe 120 is located can ensure that the normal-temperature air can flow from the discharging end of the core mold assembly 100 to the feeding end, realizing uniform cooling in the mold.

[0044] Preferably, it further includes a distribution plate 200 and a connecting piece 210. The feeding end of the distribution plate 200 is connected to an external screw extruder, and the discharging end of the distribution plate 200 is connected to the core mold assembly 100 through the connecting piece 210. The plastic melt extruded by the screw extruder is evenly distributed through the flow channels in the distribution plate 200 and then passes through each connecting piece 210 and enters the core mold assembly 100.

[0045] Preferably, an avoidance space is formed between the distribution plate 200 and the feeding end face of the core mold assembly 100 through the connecting piece 210, and the central air extraction pipe 110 and the circumferential air extraction pipe 140 are bent and extend outwards from the avoidance space. That is to say, due to the setting of the distribution plate 200 and the connecting piece 210, the purpose of central air extraction is realized, the area of the air extraction channel is enlarged, the cooling effect is improved, and finally the product quality of the pipe is improved.

[0046] Preferably, a flow guide plate 300 is installed at the air inlet end of the central air extraction pipe 110. The flow guide plate 300 has a flow guide channel 310. The air inlet end of the flow guide channel 310 extends to a position close to the inner wall of the pipe. Through the setting of the flow guide plate 300, the hot air in the pipe can be made to flow along the inner wall of the pipe and be sucked into the flow guide channel 310, and finally be drawn outwards along the central air extraction pipe 110, thereby improving the cooling effect on the inner wall of the pipe.

[0047] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed above, but also include technical solutions composed of any combination of the above technical features. The above are the specific implementation manners of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present utility model.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0049] In addition, in the present utility model, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present utility model, unless otherwise clearly specified and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

Claims

1. A dual-channel exhaust pipe extrusion die, characterized in that: include: A core-die assembly for extruding a pipe; A central exhaust pipe is arranged along the central axis direction of the core mold assembly and extends outward, and the central exhaust pipe is used to extract the heat inside the pipe to the outside to achieve cooling of the inner wall of the pipe; An air inlet pipe is coaxially arranged with the central exhaust pipe, and a distance is left between the inner wall of the air inlet pipe and the outer wall of the central exhaust pipe to form an air inlet channel. At the same time, an in-mold cooling channel is formed between the outer wall of the air inlet pipe and the inner wall of the core mold assembly. The air inlet channel is connected to the in-mold cooling channel and is used to extract the heat inside the core mold assembly to the outside to achieve cooling of the inner wall of the core mold assembly.

2. A dual-channel exhaust pipe extrusion die according to claim 1, characterized in that: A first end plate is arranged on the cross section of the feeding end of the core mold assembly, and the first end plate abuts against the outer wall of the air inlet pipe.

3. A dual-channel exhaust pipe extrusion die according to claim 2, characterized in that: It also includes an annular exhaust pipe, which is installed on the first end plate and connected to an external variable frequency suction fan, and the outlet end of the in-mold cooling channel is connected to the annular exhaust pipe.

4. A dual-channel exhaust pipe extrusion die according to claim 3, characterized in that: The number of the annular exhaust ducts can be multiple and evenly distributed, and each of the annular exhaust ducts merges and is connected to an external variable frequency suction fan.

5. A dual-channel exhaust pipe extrusion die according to claim 1, characterized in that: It also includes a second end plate, which can be arranged on the section of the discharge end of the core mold assembly, or on the annular space inside the section of the discharge end of the core mold assembly, and the second end plate abuts against the outer wall of the central exhaust pipe.

6. A dual-channel exhaust pipe extrusion die according to claim 5, characterized in that: A distance is left between the air outlet end of the air inlet pipe and the second end plate to form a ventilation gap, and the air inlet pipe is connected with the in-mold cooling channel through the ventilation gap.

7. A dual-channel exhaust pipe extrusion die according to claim 1, characterized in that: A temperature sensor is provided on the inner wall of the core mold assembly, and the control system controls the motor speed of the external variable frequency suction fan through the temperature detected by the temperature sensor to adjust the air volume.

8. A dual-channel exhaust pipe extrusion die according to claim 3, characterized in that: It also includes a diverter plate and a connecting piece. The feed end of the diverter plate is connected to an external screw extruder, and the discharge end of the diverter plate is connected to the core mold assembly through the connecting piece.

9. A dual-channel exhaust pipe extrusion die according to claim 8, characterized in that: An escape space is formed between the diverter plate and the feed end face of the core mold assembly through the connecting piece, and the central exhaust pipe and the annular exhaust pipe are bent and extended outward from the escape space.

10. A dual-channel exhaust pipe extrusion die according to claim 1, characterized in that: A guide plate is installed at the air inlet end of the central exhaust pipe, and a guide channel is provided in the guide plate. The air inlet end of the guide channel extends to a position close to the inner wall of the pipe.

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