Sizing device for production of polyolefin plastic cable sheath tube

Abstract

The utility model belongs to the technical field of pipe sizing equipment, and relates to a sizing device for producing a polyolefin plastic cable sheath pipe, which comprises a sizing sleeve for sizing a pipe, a spray cooling assembly and a water curtain box, wherein the spraying cooling assembly comprises an annular sizing sleeve front cover body and a spraying pipe, the sizing sleeve front cover body coaxially covers one end of the sizing sleeve, a first water inlet is formed in one side of the sizing sleeve front cover body, the spraying pipe is arranged on the surface of the rear side of the sizing sleeve front cover body and communicates with the first water inlet, and a plurality of spraying openings are formed in the surface of the spraying pipe in an array mode in the axial direction; the water curtain box is an annular cylinder and is coaxially fixed to the front side of the sizing sleeve front cover body, a second water inlet is formed in the outer side of the water curtain box, an annular first water outlet is formed in the inner ring surface of the water curtain box around the center axis of the water curtain box, and the first water outlet forms a water curtain so that a uniform water film can be attached to the surface of a pipe entering the sizing sleeve. The spraying pipe cools the surface of the sizing pipe to prolong the stability of a water film, so that the pipe is quickly cooled and shaped and quickly passes through the sizing sleeve.

Description

Technical Field

[0001] This application belongs to the technical field of pipe sizing equipment, and particularly relates to a sizing device for the production of polyolefin plastic cable sheathing pipes. Background Art

[0002] To protect cables, plastic sheathing pipes made of polyolefin materials are required. During the extrusion production process of such plastic pipes, the polyolefin material enters the extruder. After steps such as melting and plasticizing, the plastic-like pipe blank is extruded from the die. At this time, the pipe blank is not fully shaped and a sizing sleeve is needed as the mold for the pipe, which simultaneously completes the preliminary cooling and shaping while determining its geometric dimensions. Existing sizing sleeves usually introduce the cooling water in the water tank into the internal space of the sizing sleeve through a water flow pressurization device, and complete the cooling and sizing of the pipe by spraying the pipe or immersing the pipe in water.

[0003] In the prior art, a Chinese invention with the publication number CN110948815B discloses a sizing device for PVC pipes. The device includes an outer fixed pipe, and an inner fixed pipe is coaxially and fixedly connected inside the outer fixed pipe. At both ends of the outer fixed pipe and the inner fixed pipe along their axial directions, sizing sleeves are coaxially and fixedly embedded together. Along the circumferential direction between the outer fixed pipe and the inner fixed pipe, multiple groups of cooling components are reciprocally swingably arranged. The cooling components include a plurality of cold water pipe heads, and the cold water pipe heads penetrate through the inner fixed pipe and point towards the inside of the inner fixed pipe. An outlet pipe is arranged between the outer fixed pipe and the inner fixed pipe. This device swings the cold water pipe heads around the circumference of the sizing sleeve, and by means of the swing, the cooling water flowing out of the cold water pipe heads uniformly cools the pipe inside the sizing sleeve. When using this device to cool the pipe, the following problems are faced: The pipe can only be cooled by the cooling water after it enters the inside of this sizing device. Since the plastic pipe is not shaped before entering the device, directly entering the sizing device is likely to cause friction or contact with the inlet, resulting in damage to the outer surface of the plastic pipe. Secondly, when the pipe passes through this device, due to the swing of the cold water pipe heads, some parts of the outside of the pipe may not come into contact with the water flow, which is likely to cause scratches or water patterns on the pipe surface, affecting the appearance quality of the pipe. Summary of the Invention

[0004] Based on the above needs in the background art, this application provides a sizing device for the production of polyolefin plastic cable sheathing pipes, which can solve the problems of damage or water patterns on the outer surface of the pipe caused by the lack of a complete water film protection when the pipe enters and passes through the sizing sleeve in the prior art, and ensure an improvement in the appearance quality of the pipe.

[0005] To achieve the above object, the technical solution of this application is:

[0006] A sizing device for producing polyolefin plastic cable sheath pipes, comprising a sizing sleeve, a spray cooling assembly and a water curtain box, wherein the spray cooling assembly comprises a front cover body of the sizing sleeve and a spray pipe, the front cover body of the sizing sleeve is annular, the front cover body of the sizing sleeve is coaxially covered at one end port of the sizing sleeve, a first water inlet is arranged on one side of the front cover body of the sizing sleeve, the spray pipe is arranged on the surface of the front cover body of the sizing sleeve facing the other end of the sizing sleeve and is communicated with the first water inlet, a plurality of spray ports are arranged on the surface of the spray pipe along the axial array of the sizing sleeve, and the spray ports are used to spray cooling water onto the surface of the sizing sleeve; the water curtain box is an annular cylinder, the water curtain box is coaxially fixed to the side of the front cover body of the sizing sleeve away from the sizing sleeve, at least one second water inlet is arranged on the surface of the water curtain box, and along the axial direction of the water curtain box, the inner ring surface of the water curtain box is annularly provided with a first water outlet around the central axis of the water curtain box.

[0007] Preferably, the spray cooling assembly also includes a water collecting sleeve and a sizing sleeve rear cover body covering one end of the water collecting sleeve, the water collecting sleeve is coaxially fixed to the side surface of the sizing sleeve front cover body facing away from the water curtain box, and a water collecting space is formed between the water collecting sleeve and the sizing sleeve, and the spray pipe is located in the water collecting space; the sizing sleeve rear cover body is provided with a second water outlet, and the second water outlet is connected to the water collecting space.

[0008] Preferably, there are a plurality of the first water inlets and the spray pipes, and the plurality of the spray pipes and the first water inlets are connected in a one-to-one correspondence and are evenly distributed axially around the sizing sleeve.

[0009] Preferably, along the axial direction of the sizing sleeve, a plurality of heat sinks are provided at intervals on the surface of the sizing sleeve.

[0010] Preferably, along the axial direction of the sizing sleeve, the distance between the heat sinks gradually increases from one end of the sizing sleeve adjacent to the front cover of the sizing sleeve to the other end.

[0011] Preferably, the outline of the side with the largest surface area of ​​the heat sink is any one of rectangular, circular or fan-shaped.

[0012] Preferably, the heat sink is a copper-aluminum alloy sheet.

[0013] Preferably, a plurality of guide grooves are arranged in the water curtain box, and the plurality of guide grooves are evenly and closely distributed in a diffused manner around the axis of the first water outlet.

[0014] Preferably, the number of the second water inlets is four, and the second water inlets are evenly distributed around the central axis of the water curtain box.

[0015] By adopting the above technical solutions, compared with the prior art, the present application has at least the following beneficial effects:

[0016] During the process of feeding the to-be-shaped plastic pipe into the sizing sleeve, the plastic pipe preferentially contacts the water curtain at the first water outlet before entering the sizing sleeve, causing a water film to form on the surface of the plastic pipe and increasing the hardness of the plastic pipe, enabling the plastic pipe to directly enter the sizing sleeve and avoiding scratches on the surface of the plastic pipe caused by the sizing sleeve inlet contacting the surface of the plastic pipe; during the process of the plastic pipe passing through the sizing sleeve, the spray pipe cooperates with the water curtain box to continuously spray the surface of the sizing sleeve, reducing the temperature of the sizing sleeve and minimizing the internal and external temperature difference, enabling the water film on the surface of the plastic pipe to continuously exist and remain uniform and complete, effectively avoiding scratches on the plastic pipe caused by direct contact between the inner wall of the sizing sleeve and the surface of the plastic pipe, and avoiding the phenomenon of water patterns appearing on the surface of the plastic pipe due to local water flow impact, improving the appearance quality of the plastic pipe finished product. Description of the Drawings

[0017] Figure 1 It is an isometric structural schematic diagram of the sizing device in the embodiment.

[0018] Figure 2 It is an A-A cross-sectional view of the sizing device in the embodiment.

[0019] Figure 3 It is a B-B cross-sectional view of the sizing device in the embodiment.

[0020] In the figure: sizing sleeve 10, heat sink 11, spray cooling assembly 20, front cover body 21 of the sizing sleeve, first water inlet 211, spray pipe 22, spray port 221, water collecting sleeve 23, rear cover body 24 of the sizing sleeve, second water outlet 241, water curtain box 30, second water inlet 31, first water outlet 32, diversion groove 33. Detailed Embodiments

[0021] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will further describe the technical solutions of the present application in conjunction with the drawings of the embodiments of the present application. The present application is not limited to the following specific embodiments.

[0022] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of the present application, it should be understood that if there are terms such as "upper", "lower", "inner", "outer", "left", "right", "front", "back", "top", "bottom", etc., the directions or positional relationships indicated are based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the structures or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The following will further elaborate on the present application in conjunction with the attached Figure 1 drawings Figure 3 and specific embodiments.

[0024] In the present application, a sizing device for producing polyolefin plastic cable sheathing tubes (hereinafter referred to as the sizing device) is disclosed. The device includes a sizing sleeve 10, a spray cooling assembly 20, and a water curtain box 30. The spray cooling assembly 20 includes a front cover body 21 of the sizing sleeve and a spray pipe 22. The front cover body 21 of the sizing sleeve is annular. The front cover body 21 of the sizing sleeve is covered on the inlet end of the sizing sleeve 10 through a connection structure such as a thread or a bolt. A first water inlet 211 is provided on one side of the front cover body 21 of the sizing sleeve. The spray pipe 22 is fixed on the surface of the front cover body 21 of the sizing sleeve facing the other end of the sizing sleeve 10. One end of the first water inlet 211 penetrates through the front cover body 21 of the sizing sleeve and communicates with the spray pipe 22. A plurality of spray nozzles 221 are arranged in an array along the axial direction of the sizing sleeve 10 on the surface of the spray pipe 22. The spray nozzles 221 are used to spray water towards the surface of the sizing sleeve 10. The annular columnar water curtain box 30 is coaxially arranged on the side of the front cover body 21 of the sizing sleeve facing away from the sizing sleeve 10 through a connection structure such as a thread or a bolt. At least one second water inlet 31 is provided on the surface of the water curtain box 30. The second water inlet 31 communicates with the cavity inside the water curtain box 30. An annular first water outlet 32 is formed on the inner ring side wall of the water curtain box 30 around the central axis of the water curtain box 30. A channel for the plastic pipe to be shaped to pass through is formed among the inner ring of the water curtain box 30, the inner ring of the front cover body 21 of the sizing sleeve, and the sizing sleeve 10. When the plastic pipe enters this channel, the water flowing out from the first water outlet 32 forms a water curtain to wet the surface of the plastic pipe and forms a water film on the surface of the plastic pipe.

[0025] When using the above sizing device, the vacuum water tank is connected to the first water inlet 211 and the second water inlet 31 through a water supply pipeline. The cooling water in the vacuum water tank enters the water curtain box 30 and forms a water curtain at the first water outlet 32. The cooling water also enters the spray pipe 22 and is sprayed out from the spray nozzle 221 to quickly cool the surface of the sizing sleeve 10. (Using the "vacuum water tank" to supply water is one of the conventional technical means to implement the present application and is not an essential technical feature for solving the technical problems of the present application. Therefore, it will not be described in detail herein and will not be elaborated hereinafter).

[0026] Using the above sizing device can achieve at least the following technical effects:

[0027] During the process of feeding the plastic pipe to be shaped into the sizing sleeve 10, the plastic pipe first contacts the water curtain at the first water outlet 32 before entering the sizing sleeve 10, causing a water film to form on the surface of the plastic pipe and increasing the hardness of the plastic pipe, enabling the plastic pipe to enter the sizing sleeve 10 directly and avoiding scratches on the surface of the sizing sleeve 10 caused by the entrance of the sizing sleeve 10 contacting the surface of the plastic pipe. During the process of the plastic pipe passing through the sizing sleeve 10, the spray pipe 22 and the water curtain box 30 cooperate to continuously spray the surface of the sizing sleeve 10, reducing the temperature of the sizing sleeve 10 and minimizing the internal and external temperature difference, enabling the water film on the surface of the plastic pipe to continuously exist and remain uniform and complete, effectively avoiding scratches on the plastic pipe caused by direct contact between the inner wall of the sizing sleeve 10 and the surface of the plastic pipe, and avoiding the phenomenon of water streaks caused by local water flow impact on the surface of the plastic pipe, improving the appearance quality of the finished plastic pipe.

[0028] In addition, the present application also provides some more specific implementation manners to improve the above sizing device.

[0029] Further, to enable the cooling water to be recycled and improve the cooling efficiency of the plastic pipe, the above spray assembly further includes a water collecting sleeve 23 and a sizing sleeve rear cover 24 covering one end of the water collecting sleeve 23. The water collecting sleeve 23 is a high-pressure resistant glass tube or other hard water pipe with an inner diameter larger than the outer diameter of the sizing sleeve 10. The sizing sleeve rear cover 24 is fixedly connected to the sizing sleeve front cover 21 by bolts and seals and fixes the water collecting sleeve 23 between the sizing sleeve front cover 21 and the sizing sleeve rear cover 24, forming a water collecting space between the outer surface of the sizing sleeve 10 and the inner surface of the water collecting sleeve 23. The above spray pipe 22 is located in the technical space, and the sizing sleeve rear cover 24 is provided with a second water outlet 241 on the lower side, and the second water outlet 241 is communicated with the water collecting space.

[0030] When using the above device, the water collecting sleeve 23 collects the cooling water sprayed out by the spray pipe 22. As the liquid level of the cooling water accumulates to a certain height, it can cool the lower part of the sizing pipe. At the same time, the cooling water in the water collecting space is timely pumped out from the second water outlet 241 through a water pump, enabling rapid cooling circulation in the water collecting space, not only saving cooling water but also improving the utilization rate and cooling efficiency of the cooling water.

[0031] In another embodiment, the difference from the above embodiment lies in that: the number of the above-mentioned first water inlets 211 and spray pipes 22 is several, and the several spray pipes 22 are in one-to-one correspondence and communication with the first water inlets 211 and are uniformly distributed around the axis of the sizing sleeve 10.

[0032] When using the above device, multiple spray pipes 22 extend along the axis of the sizing sleeve 10 and surround the surface of the sizing sleeve 10. The water spray nozzles on the spray pipes 22 spray cooling water on the sizing sleeve 10 from various angles, further improving the cooling uniformity and cooling efficiency of the sizing sleeve 10, helping to extend the retention time of the water film on the surface of the plastic pipe, and accelerating the cooling and shaping of the plastic pipe.

[0033] Furthermore, to improve the heat dissipation efficiency of the sizing sleeve 10, a number of heat dissipation fins 11 are sleeved on the surface of the sizing sleeve 10 at intervals along the axis of the sizing sleeve 10.

[0034] Specifically, since the temperature of the plastic pipe is relatively high at the entrance stage when it enters the sizing sleeve 10, and as it gradually passes through the sizing sleeve 10 and moves backward, the temperature of the plastic pipe gradually decreases. To conform to the temperature change characteristics of the plastic pipe and reduce the manufacturing cost of the device, the distance between the above-mentioned heat dissipation fins 11 gradually increases from one end of the sizing sleeve 10 adjacent to the front cover 21 of the sizing sleeve to the other end, so that the temperature of the sizing sleeve 10 is in a stable downward trend. To ensure that the heat dissipation fins 11 can meet the basic heat conduction requirements, the contour of the side with the largest surface area of the above-mentioned heat dissipation fins 11 is any one of a rectangle, a circle or a sector; in terms of material, the heat dissipation fins 11 are made of copper-aluminum alloy sheets to reduce the overall weight of the device and maintain good heat dissipation performance and corrosion resistance.

[0035] Furthermore, to improve the uniformity of the water film on the surface of the pipe, a number of diversion grooves 33 are provided in the above-mentioned water curtain box 30, and the several diversion grooves 33 are evenly and closely distributed in a diffusion shape around the axis of the first water outlet 32. The cooling water entering the water curtain box 30 is divided into multiple streams and flows through the diversion grooves 33 to be guided to the surface of the pipe, achieving the effect of water pressure equalization, and forming a water curtain with uniform distribution and similar pressure on the circumference to realize the pre-cooling of the pipe blank and form a uniform water film on the surface of the pipe.

[0036] Furthermore, the number of the above-mentioned second water inlets 31 is four. Preferably, the four second water inlets 31 are uniformly distributed on the surface of the water curtain box 30 around the central axis of the water curtain box 30, which can enable the water flow to enter the water curtain box 30 from multiple angles, and the water flow is equalized before passing through the diversion grooves 33, ensuring that the water flow velocities in the diversion grooves 33 adjacent to each second water inlet 31 are relatively uniform, so as to prevent local impact on the surface of the plastic pipe caused by uneven water flow velocities.

[0037] Combined with the above structures, the sizing device can achieve good pre-cooling and sizing effects on the to-be-sized pipe materials, while reducing the surface damage of the pipe materials by the sizing sleeve 10, improving the cooling efficiency, and reducing the cooling cost.

[0038] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, rather than limiting the implementation manners of the present application. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A sizing device for the production of polyolefin plastic cable sheath pipes, comprising a sizing sleeve, characterized in that: Also includes, A spray cooling assembly, the spray cooling assembly comprising a front cover body of a sizing sleeve and a spray pipe, the front cover body of the sizing sleeve is annular, the front cover body of the sizing sleeve is coaxially covered at one end port of the sizing sleeve, a first water inlet is arranged on one side of the front cover body of the sizing sleeve, the spray pipe is arranged on the surface of the front cover body of the sizing sleeve facing the other end of the sizing sleeve and is connected with the first water inlet, a plurality of spray ports are arranged on the surface of the spray pipe along the axial array of the sizing sleeve, the spray ports are used to spray cooling water onto the surface of the sizing sleeve; and, A water curtain box is an annular cylinder, and is coaxially fixed to the side of the front cover of the sizing sleeve away from the sizing sleeve. At least one second water inlet is provided on the surface of the water curtain box. Along the axial direction of the water curtain box, the inner ring surface of the water curtain box is provided with a first water outlet in a ring shape around the central axis of the water curtain box.

2. The sizing device according to claim 1, characterized in that: The spray cooling assembly also includes a water collecting sleeve and a sizing sleeve rear cover body arranged at one end of the water collecting sleeve, the water collecting sleeve is coaxially arranged on the side surface of the sizing sleeve front cover body facing away from the water curtain box, and a water collecting space is formed between the water collecting sleeve and the sizing sleeve, and the spray pipe is located in the water collecting space; the sizing sleeve rear cover body is provided with a second water outlet, and the second water outlet is connected to the water collecting space.

3. The sizing device according to claim 1, characterized in that: There are a plurality of the first water inlets and the spray pipes, and the plurality of the spray pipes and the first water inlets are connected in a one-to-one correspondence and are evenly distributed around the axial direction of the sizing sleeve.

4. The sizing device according to claim 1, characterized in that: Along the axial direction of the sizing sleeve, a plurality of heat sinks are arranged at intervals on the surface of the sizing sleeve.

5. The sizing device according to claim 4, characterized in that: Along the axial direction of the sizing sleeve, the distance between the heat sinks gradually increases from one end of the sizing sleeve adjacent to the front cover of the sizing sleeve to the other end.

6. The sizing device according to claim 4, characterized in that: The contour of the side with the largest surface area of ​​the heat sink is any one of rectangular, circular or fan-shaped.

7. The sizing device according to claim 4, characterized in that: The heat sink is a copper-aluminum alloy sheet.

8. The sizing device according to claim 1, characterized in that: A plurality of guide grooves are arranged in the water curtain box, and the guide grooves are evenly and closely distributed in a diffused manner around the axis of the first water outlet.

9. The sizing device according to claim 1, characterized in that: The number of the second water inlets is four, and the second water inlets are evenly distributed around the central axis of the water curtain box.

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