Core cooling device of plastic pipe extrusion die

Abstract

The utility model discloses a core cooling device of a plastic pipe extrusion die, and belongs to the technical field of plastic pipe extrusion. Comprising a core mold assembly used for extruding a pipe; the central exhaust pipe is arranged in the central axis direction of the core mold assembly and extends outwards, and the central exhaust pipe is communicated with the inner cavity of the pipe and extracts heat in the inner cavity of the pipe; the pipe wall of the central exhaust pipe is provided with at least one group of ventilation openings arranged at intervals along the circumferential direction, and the ventilation openings are communicated with the inner cavity of the core mold assembly and the exhaust channel of the central exhaust pipe; and the sliding sleeve is movably arranged on the outer wall of the central exhaust pipe in a sleeving mode, and the opening and closing states of the ventilation opening are controlled through axial movement of the sliding sleeve. The opening and closing state of the ventilation opening is flexibly adjusted through axial movement of the sliding sleeve, and the cooling force on the inner cavity of the core mold assembly can be actively adjusted, so that relatively independent control over two different cooling areas of a pipe and a mold is realized, it is ensured that the pipe and the mold can obtain the optimal cooling effect, and the operation flexibility and the cooling efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of plastic pipe extrusion, specifically relates to a core cooling device of plastic pipe extrusion mould. BACKGROUND

[0002] When plastic pipe is extruded, the inner wall of the pipe and the inner wall of the core mould assembly need to be cooled synchronously. In the prior art, the inner wall of the pipe is usually cooled by a central air extraction method, that is, a central air extraction pipe is arranged along the central axis of the core mould assembly to extract air and dissipate heat. The cooling of the inner wall of the core mould assembly has the following two schemes.

[0003] 1. Cooling oil jacket circulation cooling: a cooling oil jacket is arranged on the inner wall of the core mould assembly, and the cooling oil is circulated to achieve cooling. However, in a high-temperature environment, there is a risk of oil leakage due to sealing failure.

[0004] 2. Passive air hole heat dissipation: air holes are arranged on the wall of the central air extraction pipe, and the heat in the inner cavity of the core mould assembly is passively extracted during the air extraction process. However, this method conflicts with the cooling requirement of the inner cavity of the pipe, and the two cannot be independently controlled. UTILITY MODEL CONTENTS

[0005] The utility model is proposed to solve the above problems in the prior art, and provides a core cooling device of a plastic pipe extrusion mould, which can control the cooling of the core mould assembly and the inner wall of the pipe.

[0006] The utility model can be implemented by the following technical solutions:

[0007] A core cooling device of a plastic pipe extrusion mould, comprising:

[0008] A core mould assembly for extruding a pipe;

[0009] A central air extraction pipe arranged along the central axis of the core mould assembly and extending outward, which communicates with the inner cavity of the pipe and extracts heat from the inner cavity;

[0010] The wall of the central air extraction pipe is provided with at least one group of circumferentially spaced air vents, which communicate the inner cavity of the core mould assembly with the air extraction channel of the central air extraction pipe;

[0011] A sliding sleeve movably sleeved on the outer wall of the central air extraction pipe, which controls the opening and closing state of the air vent by axial movement of the sliding sleeve, wherein

[0012] When the sliding sleeve closes the air vent, the central air extraction pipe only extracts heat from the inner cavity of the pipe;

[0013] When the sliding sleeve opens the air vent, the central air extraction pipe simultaneously extracts heat from the inner cavity of the pipe and the inner cavity of the core mould assembly.

[0014] As a further improvement of the utility model, it further comprises a driving mechanism connected with the sliding sleeve and used for controlling axial movement of the sliding sleeve along the outer surface of the central exhaust pipe.

[0015] As a further improvement of the utility model, the driving mechanism comprises a handle, a pull rod and a bracket, the handle and the bracket are respectively arranged at two ends of the pull rod, the sliding sleeve is connected with the bracket, and the handle is located outside the core mold assembly.

[0016] As a further improvement of the utility model, the central exhaust pipe is further sleeved with an air inlet plate, the air inlet plate is connected with the end of the core mold assembly, a plurality of air inlets are uniformly arranged on the air inlet plate in a ring shape, and external cooling air enters the inner cavity of the core mold assembly through the air inlets.

[0017] As a further improvement of the utility model, the pull rod passes through the air inlets and extends to the outside of the core mold assembly.

[0018] As a further improvement of the utility model, the surface of the pull rod near one end of the handle is provided with a scale, the handle drives the pull rod to axially displace when the handle moves, the scale indicates the displacement amount of the pull rod moving out of or moving into the inner cavity of the core mold assembly, and the opening and closing degree of the air vent is reflected.

[0019] As a further improvement of the utility model, a plurality of temperature sensors are arranged on the inner wall of the core mold assembly, and the real-time temperature is detected through the temperature sensors.

[0020] As a further improvement of the utility model, when the air vents are provided with multiple groups, the air vents in each group are arranged at intervals along the axial direction of the central exhaust pipe and are provided with independent sliding sleeves, and each sliding sleeve is controlled to move through an independent handle.

[0021] As a further improvement of the utility model, a guide plate is installed at the air inlet end of the central exhaust pipe, the guide plate has a guide channel, and the air inlet end of the guide channel extends to a position close to the inner wall of the pipe.

[0022] As a further improvement of the utility model, it further comprises:

[0023] A shunt plate, the feeding end of which is connected with an external extruder;

[0024] A connecting piece, two ends of which are respectively connected with the discharging end of the shunt plate and the feeding end surface of the core mold assembly;

[0025] The central exhaust pipe extends outward from the avoiding space formed between the connecting piece and the feeding end surface of the core mold assembly after being bent.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] 1. Independent regulation ability: compared with the scheme of passive air hole heat dissipation in the prior art, the application flexibly adjusts the opening and closing state of the ventilation opening through the axial movement of the sliding sleeve, can actively adjust the cooling intensity of the inner cavity of the core mold combination according to actual needs, thereby realizing the relative independent control of two different cooling areas, ensuring that both can obtain the best cooling effect, and the design greatly improves the operation flexibility and cooling efficiency;

[0028] 2. Reduce the failure risk: the cooling oil jacket circulation cooling mode in the prior art has the risk of oil leakage caused by sealing failure in high temperature environment, and the application adopts physical structure (sliding sleeve, ventilation opening and the like) for cooling control, avoids the leakage problem caused by the use of the cooling oil jacket, and reduces the maintenance cost and safety risk;

[0029] 3. Improve the regulation accuracy: the end of the pull rod close to the handle is provided with a scale 321, so that the operator can accurately understand the displacement amount of the pull rod through the scale indication, reflect the actual position of the sliding sleeve relative to the ventilation opening, thereby realizing more fine regulation and control, and this improvement is particularly important for the production process which needs to strictly control the cooling effect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the sectional view of the core cooling device of the plastic pipe extrusion die of the utility model;

[0031] Figure 2 is the Figure 1 partial enlarged view of A in the utility model;

[0032] Figure 3 is the Figure 1 partial enlarged view of B in the utility model;

[0033] Figure 4 is the local structure schematic view of the center air extraction pipe at the ventilation opening position of the utility model.

[0034] In the drawing, 100, core mold combination; 110, air inlet plate; 111, air inlet; 120, shunt plate; 130, connecting piece;

[0035] 200, center air extraction pipe; 210, ventilation opening; 220, guide plate; 221, guide channel;

[0036] 300, sliding sleeve; 310, handle; 320, pull rod; 321, scale; 330, support. DETAILED DESCRIPTION

[0037] The utility model provides a specific embodiment as follows and further describes the technical method of the utility model in combination with the drawings, but the utility model is not limited to these embodiments.

[0038] As Figures 1-4 The utility model provides a kind of core cooling device of plastic tubular product extrusion mould, comprising:

[0039] Core mould combination 100 is used to extrude tubular product;

[0040] Center suction pipe 200 is arranged along the central axis direction of core mould combination 100 and extends outward, and its function is to communicate with the inner cavity of tubular product and extract its internal heat, while the outer wall of center suction pipe 200 and the inner wall of core mould combination 100 form the core part ventilation cooling channel of mould;

[0041] The pipe wall of center suction pipe 200 is provided with at least one group of ventilation ports 210 arranged in circumferential direction, and ventilation port 210 is connected with the inner cavity of core mould combination 100 and the suction channel of center suction pipe 200, by the design of ventilation port 210, so that center suction pipe 200 can simultaneously play a cooling effect on the inner wall of tubular product and the inner wall of core mould combination 100 in the process of continuous suction;

[0042] Slip bushing 300 is movably sleeved on the outer wall of center suction pipe 200, and the opening and closing state of ventilation port 210 is controlled by the axial movement of slip bushing 300, wherein,

[0043] When slip bushing 300 closes ventilation port 210, center suction pipe 200 only extracts the heat of the inner cavity of tubular product;

[0044] When slip bushing 300 opens ventilation port 210, center suction pipe 200 simultaneously extracts the heat of the inner cavity of tubular product and the inner cavity of core mould combination 100.

[0045] That is, when the cooling intensity of core mould combination 100 needs to be adjusted, one way is to directly adjust the power of external suction fan connected with center suction pipe 200, and another way is to adjust the opening size of ventilation port 210 by slip bushing 300, and the following several adjustment modes are specific:

[0046] 1, slip bushing 300 completely closes ventilation port 210:

[0047] In this case, center suction pipe 200 only communicates with the inner cavity of tubular product, and the cooling effect on the inner wall of tubular product is adjusted by the power change of external suction fan;

[0048] This mode is suitable for the case of needing to control the cooling effect of tubular product inner wall independently without affecting core mould combination 100.

[0049] 2. Keep the opening size of vent 210 unchanged, and adjust the power of the exhaust fan:

[0050] When the sliding sleeve 300 opens the vent 210 and its opening size is fixed, the central exhaust pipe 200 simultaneously extracts heat from the inner wall of the pipe and the inner wall of the core mold assembly 100. By changing the power of the external exhaust fan, the cooling effect of these two areas can be adjusted at the same time.

[0051] This method is suitable for scenarios where the cooling intensity of the inner wall of the pipe and the inner wall of the mandrel assembly 100 needs to be adjusted simultaneously.

[0052] 3. Keep the exhaust fan power constant and adjust the size of the ventilation opening 210:

[0053] In this mode, although the power of the external exhaust fan remains constant, the cooling effect on the inner wall of the core mold assembly 100 can be independently adjusted by moving the sliding sleeve 300 to adjust the opening size of the vent 210.

[0054] This method allows for precise control of the cooling requirements of the inner wall of the core mold assembly 100 without changing the overall cooling power.

[0055] 4. Change the power of the exhaust fan and adjust the size of the ventilation opening 210:

[0056] In this configuration, the central exhaust duct 200 simultaneously cools both the inner wall of the duct and the inner wall of the mandrel assembly 100. First, the overall cooling effect is adjusted by changing the power of the external exhaust fan; second, the opening size of the vent 210 is further fine-tuned by moving the sliding sleeve 300 to achieve precise control over the cooling of the inner wall of the mandrel assembly 100.

[0057] This approach offers maximum flexibility, allowing for fine-tuning of the cooling effect in both zones based on specific production needs.

[0058] By selecting and combining the different adjustment methods mentioned above, operators can flexibly and precisely control the cooling effect during the extrusion process of plastic pipes according to the actual production process requirements, thereby improving product quality and production efficiency.

[0059] The cooling structure provided in this embodiment has at least the following advantages:

[0060] 1. Independent control capability: Compared with the passive air vent cooling solution in the prior art, this application flexibly adjusts the opening and closing state of the vent 210 by axial movement of the sliding sleeve 300. It can actively adjust the cooling force on the inner cavity of the core mold assembly 100 according to actual needs, thereby realizing relatively independent control of two different cooling areas and ensuring that both can obtain the best cooling effect. This design greatly improves the operational flexibility and cooling efficiency.

[0061] 2. Reducing the risk of failure: the cooling oil jacket circulation cooling method in the prior art has the risk of oil leakage due to sealing failure in high temperature environment, while the present application uses physical structures (slipper 300, ventilation port 210, etc.) for cooling control, avoiding the leakage problem that may be caused by using cooling oil jacket, reducing maintenance cost and safety risk.

[0062] Preferably, it also includes a driving mechanism connected with the slipper 300 and used for controlling the axial movement of the slipper 300 along the outer surface of the central exhaust duct 200, which consists of the following components:

[0063] Handle 310: located outside the core mold assembly 100, convenient for operators to manually adjust. The design of the handle 310 takes into account the convenience and accuracy of operation, ensuring that the position of the slipper 300 can be easily adjusted during production;

[0064] Pull rod 320: as a key component connecting the handle 310 and the bracket 330, the pull rod 320 is responsible for transmitting the operating force from the handle 310 to the bracket 330, thereby driving the axial movement of the slipper 300 along the central exhaust duct 200. The pull rod 320 needs to have enough rigidity and flexibility to ensure the accuracy of the operation;

[0065] Bracket 330: directly connected with the slipper 300, the function of the bracket 330 is to fix the slipper 300 and convert the action of the pull rod 320 into the axial displacement of the slipper 300. Through the reasonable design of the bracket 330, the stability and accuracy of the slipper 300 during movement can be guaranteed.

[0066] The design of this driving mechanism enables the operator to accurately control the position of the slipper 300 from the outside of the core mold assembly 100 through simple handle 310 operation, and then adjust the opening size of the ventilation port 210. Such design not only improves the convenience of operation, but also enhances the controllability of the cooling process, which helps to improve product quality and production efficiency.

[0067] It is worth mentioning here that in order to further improve the accuracy of operation, a scale 321 is provided at the end of the pull rod 320 close to the handle 310, so that the operator can accurately understand the displacement of the pull rod 320 through the scale 321 indication, reflecting the actual position of the slipper 300 relative to the ventilation port 210, so as to realize more fine control. This improvement is particularly important for production processes that require strict control of cooling effect.

[0068] Preferably, the central exhaust pipe 200 is also sleeved with an air inlet plate 110, which is connected to the end of the core mold assembly 100. The air inlet plate 110 is provided with a plurality of air inlets 111 evenly distributed in a ring shape. The external cooling air enters the inner cavity of the core mold assembly 100 through the air inlets 111, and after flowing through the inner cavity of the core mold assembly 100 and absorbing heat, it enters the exhaust channel of the central exhaust pipe 200 through the air vents 210 and is exhausted outward, forming a complete cooling path.

[0069] Preferably, the inner wall of the core mold assembly 100 is provided with a plurality of temperature sensors. The real-time temperature of the region is detected by the temperature sensor, which provides accurate data support for the operator. Based on the data provided by the temperature sensor, the operator can more finely adjust the opening degree of the air vent 210 and the supply amount of external cooling air, ensuring that the cooling system operates in the optimal state.

[0070] In addition, it should be noted that the air vent 210 can be provided with multiple groups on the central exhaust pipe 200, which will be described in detail as follows:

[0071] 1. When the air vent 210 is provided with only one group:

[0072] This group of air vents 210 should be located at the end of the core mold assembly 100 close to the pipe extrusion outlet, so as to ensure that the cooling air entering from the air inlet plate 110 can flow through the entire inner cavity of the core mold assembly 100 to the greatest extent, thereby improving the cooling effect and preventing the occurrence of a situation where a certain region in the inner cavity of the core mold assembly 100 is overheated.

[0073] 2. When the air vent 210 is provided with multiple groups:

[0074] Each group of air vents 210 is arranged along the axis direction of the central exhaust pipe 200 and is provided with an independent sliding sleeve 300. Each sliding sleeve 300 is controlled to move by an independent handle 310, which means that the operator can finely adjust the cooling degree of each different region as needed, thereby realizing independent cooling control of different parts of the inner cavity of the core mold assembly 100 and providing greater flexibility.

[0075] Preferably, the air inlet end of the central exhaust pipe 200 is provided with a flow guide plate 220. The flow guide plate 220 has a flow guide channel 221 therein. The air inlet end of the flow guide channel 221 extends to a position close to the inner wall of the pipe. This arrangement allows the cooling air to directly act on the inner wall of the pipe, quickly removing heat, thereby improving the cooling efficiency of the inner wall of the pipe and helping to quickly reduce the temperature and reduce the possibility of deformation.

[0076] Preferably, the present application further comprises:

[0077] A flow distribution plate 120, the feeding end of which is connected to the external extruder;

[0078] a connecting piece 130, which is connected with the discharge end of the flow distribution plate 120 and the feeding end face of the core mold assembly 100 respectively;

[0079] It should be noted that the connecting piece 130 forms an avoiding space between the flow distribution plate 120 and the feeding end face of the core mold assembly 100, so that the central suction pipe 200 can be bent and extended out of the avoiding space, so as to achieve the purpose of central suction, expand the suction passage area, improve the cooling effect, and finally improve the product quality of the pipe.

[0080] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above technical means, and also includes the technical scheme composed of any combination of the above technical features. The above is the specific implementation manner of the utility model, and it should be pointed out that, for ordinary technical personnel in the technical field, some improvements and decorations can be made without departing from the principle of the utility model, and these improvements and decorations are also regarded as the protection range of the utility model.

[0081] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the utility model embodiment are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0082] In addition, the description of "first", "second", "one" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary technical personnel in the field, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0083] The technical solutions of each embodiment of the utility model can be combined with each other, but it must be based on the realization of ordinary technical personnel in the field, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection range required by the utility model.

[0084] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A core cooling device for a plastic pipe extrusion die, characterized in that, include: Mandrel assembly used for extruding pipes; A central exhaust duct is provided along the central axis of the core mold assembly and extends outward. The central exhaust duct is connected to the inner cavity of the pipe and extracts heat from its interior. The central exhaust pipe has at least one set of vents arranged circumferentially, and the vents connect the inner cavity of the core mold assembly with the exhaust channel of the central exhaust pipe. A sliding sleeve, movably fitted onto the outer wall of the central exhaust duct, controls the opening and closing state of the ventilation opening through the axial movement of the sliding sleeve. When the sliding sleeve closes the vent, the central exhaust pipe only extracts heat from the inner cavity of the pipe. When the sliding sleeve opens the vent, the central exhaust pipe simultaneously draws heat from the inner cavity of the pipe and the inner cavity of the core mold assembly.

2. The core cooling device for a plastic pipe extrusion die according to claim 1, characterized in that, It also includes a drive mechanism, which is connected to the sliding sleeve and is used to control the sliding sleeve to move axially along the outer surface of the central exhaust pipe.

3. The core cooling device for a plastic pipe extrusion die according to claim 2, characterized in that, The drive mechanism includes a handle, a pull rod, and a bracket. The handle and the bracket are respectively disposed at both ends of the pull rod. The sliding sleeve is connected to the bracket. The handle is located outside the core mold assembly.

4. The core cooling device for a plastic pipe extrusion die according to claim 3, characterized in that, An air inlet plate is also fitted onto the central exhaust pipe. The air inlet plate is connected to the end of the core mold assembly. Several air inlets are evenly distributed around the air inlet plate, and external cooling air enters the inner cavity of the core mold assembly through the air inlets.

5. The core cooling device for a plastic pipe extrusion die according to claim 4, characterized in that, The pull rod passes through the air inlet and extends to the outside of the core mold assembly.

6. The core cooling device for a plastic pipe extrusion die according to claim 3, characterized in that, The surface of the pull rod near the handle is marked with a scale. When the handle moves, it causes the pull rod to move axially. The scale indicates the amount of displacement of the pull rod as it moves out of or into the cavity of the core mold assembly, reflecting the degree of opening and closing of the vent.

7. The core cooling device for a plastic pipe extrusion die according to claim 1, characterized in that, The inner wall of the core mold assembly is equipped with several temperature sensors, which are used to detect the real-time temperature.

8. The core cooling device for a plastic pipe extrusion die according to claim 3, characterized in that, When multiple sets of ventilation openings are provided, each set of ventilation openings is arranged at intervals along the axial direction of the central exhaust pipe and is equipped with an independent sliding sleeve, and each sliding sleeve is controlled to move by an independent handle.

9. The core cooling device for a plastic pipe extrusion die according to claim 1, characterized in that, The air inlet end of the central exhaust duct is equipped with a guide plate, and the guide plate has a guide channel inside. The air inlet end of the guide channel extends to a position close to the inner wall of the duct.

10. The core cooling device for a plastic pipe extrusion die according to claim 1, characterized in that, Also includes: The manifold plate has its feed end connected to an external extruder; The connector has two ends that are respectively connected to the discharge end of the flow divider plate and the feed end face of the core mold assembly; After being bent, the central exhaust pipe extends outward from the clearance space formed between the connector and the feed end face of the core mold assembly.

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