Manufacturing method of high-rigidity PE pipeline
阅读说明：本技术 一种高刚度pe管道制造方法 (Manufacturing method of high-rigidity PE pipeline ) 是由 李挺 张伟娇 洪义华 谷新剑 洪伟武 陈平 宋荣浩 于 2020-07-31 设计创作，主要内容包括：本发明公开了一种高刚度PE管道制造方法,包括如下步骤：1)原材料通过挤出机进行塑化挤出,形成管胚；2)管胚通过定径套进入真空定径箱；3)管胚在真空定径箱中经过冷却水喷淋冷却；4)管胚出真空定径箱,形成管材；5)管材进入热处理装置,通过热处理装置对管材外表层加热；6)管材进入保温装置,通过保温装置缓慢冷却至60℃以下；7)管材进入喷淋箱,经过喷淋箱冷却；8)牵引切割。本发明的有益效果是：通过分步结晶的方法,其首先提高PE管道内壁层结晶度,再对管道外表层进行重结晶,消除残余应力,最终显著提高PE管道刚度。(The invention discloses a method for manufacturing a high-rigidity PE pipeline, which comprises the following steps: 1) plasticizing and extruding the raw materials through an extruder to form a pipe blank; 2) the pipe blank enters a vacuum sizing box through a sizing sleeve; 3) cooling the pipe blank in a vacuum sizing box by spraying cooling water; 4) taking the tube blank out of a vacuum sizing box to form a tube; 5) the pipe enters a heat treatment device, and the outer surface layer of the pipe is heated by the heat treatment device; 6) the pipe enters a heat preservation device, and is slowly cooled to below 60 ℃ through the heat preservation device; 7) the pipe enters a spraying box and is cooled by the spraying box; 8) and (5) traction cutting. The invention has the beneficial effects that: through a fractional crystallization method, the crystallinity of the inner wall layer of the PE pipeline is firstly improved, and then the outer surface layer of the pipeline is recrystallized, so that the residual stress is eliminated, and finally the rigidity of the PE pipeline is obviously improved.)
1. a manufacturing method of a high-rigidity PE pipeline is characterized by comprising the following steps:
1) plasticizing and extruding the raw materials through an extruder to form a pipe blank;
2) the pipe blank enters a vacuum sizing box through a sizing sleeve;
3) cooling the pipe blank in a vacuum sizing box by spraying cooling water;
4) taking the tube blank out of a vacuum sizing box to form a tube;
5) the pipe enters a heat treatment device, and the outer surface layer of the pipe is heated by the heat treatment device;
6) the pipe enters a heat preservation device, and is slowly cooled to below 60 ℃ through the heat preservation device;
7) the pipe enters a spraying box and is cooled by the spraying box;
8) and (5) traction cutting.
2. The method for manufacturing the high-rigidity PE pipe according to claim 1, wherein the water temperature in the vacuum sizing box in the step 3) is kept at 40-60 ℃, so that the surface temperature of the pipe blank is controlled at 80-100 ℃ when the pipe blank is discharged from the vacuum sizing box.
3. The method for manufacturing a high-rigidity PE pipe according to claim 1, wherein the temperature of the heat treatment device in the step 5) is adjusted within a range of 120-150 ℃, and the temperature of the outer surface layer of the pipe when the pipe is discharged from the heat treatment device is controlled within a range of 120-150 ℃.
4. The manufacturing method of the PE pipe with high rigidity according to claim 1, wherein the heat treatment device in the step 5) is a hollow structure and comprises a heat treatment drying tunnel (109), the heat treatment drying tunnel (109) is uniformly provided with a group of heating pipes (103) along the circumferential direction of an inner cavity of the heat treatment drying tunnel, the heat treatment drying tunnel (109) is provided with an iron sheet (108) with holes along the circumferential direction of the inner cavity of the heat treatment drying tunnel, the iron sheet (108) is located between the heating pipes (103) and the heat treatment drying tunnel (109), so that a hot air circulation channel (101) is formed between the iron sheet (108) and the heat treatment drying tunnel (109), a hot air outlet (107) is arranged above the hot air circulation channel (101), and a hot air inlet (106) is arranged below the.
5. The method for manufacturing a high-rigidity PE pipe according to claim 1, wherein the heat treatment drying tunnel (109) is provided with a first gasket (102) at each end for sealing the connection of the heat treatment drying tunnel (109).
6. The manufacturing method of the PE pipe with high rigidity according to claim 1, wherein the length of the heat treatment drying tunnel (109) is 50-150cm, and the heating pipe (103) is an infrared heating pipe.
7. The manufacturing method of the PE pipe with high rigidity according to claim 1, wherein a temperature sensor (104) is arranged on one side of the heat treatment drying tunnel (109), the temperature sensor (104) is an infrared temperature sensor, and a temperature controller (105) is connected to the temperature sensor (104).
8. The manufacturing method of the PE pipe with high rigidity according to claim 1, wherein heating pipe bases are respectively arranged at two ends of the heating pipe (103), and the heating pipe (103) is fixed to the heat treatment drying tunnel (109) through the heating pipe bases.
9. The manufacturing method of the PE pipeline with high rigidity according to claim 1, wherein the heat preservation device in the step 6) comprises a group of heat preservation units (201), each heat preservation unit (201) adopts a sealed box body, gaskets are respectively arranged at two ends of each heat preservation unit (201), and two adjacent heat preservation units (201) are sealed through second gaskets.
10. The method for manufacturing a high-rigidity PE pipeline according to claim 9, wherein heat dissipation holes are formed above the heat preservation unit (201), and a flip cover is arranged on the heat dissipation holes.
Technical Field
The invention relates to the technical field of PE pipe manufacturing, in particular to a manufacturing method of a high-rigidity PE pipe.
Background
PE pipes are generally thin in wall thickness when used for drainage, and the standard size tables of the PE pipes are generally SDR21, SDR26 and SDR33, when the PE pipes are used for siphon drainage and vacuum drainage, the pipes are subjected to vacuum negative pressure, and when the rigidity of the ring of the pipes is insufficient, the pipes are flattened. At present, the PE pipeline extrusion at home and abroad is carried out by adopting cooling water for shaping production, the control capability of the crystallinity of a PE material is weaker, the crystallinity of a product is not high, and a larger residual stress is formed in the rapid cooling and shaping process of the product, while the PE material belongs to high-crystallinity plastics, and the influence of the crystallinity on the rigidity of the product is obvious.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for manufacturing a high-rigidity PE pipeline with a reasonable structural design.
The technical scheme of the invention is as follows:
a manufacturing method of a high-rigidity PE pipeline is characterized by comprising the following steps:
1) plasticizing and extruding the raw materials through an extruder to form a pipe blank;
2) the pipe blank enters a vacuum sizing box through a sizing sleeve;
3) cooling the pipe blank in a vacuum sizing box by spraying cooling water;
4) taking the tube blank out of a vacuum sizing box to form a tube;
5) the pipe enters a heat treatment device, and the outer surface layer of the pipe is heated by the heat treatment device;
6) the pipe enters a heat preservation device, and is slowly cooled to below 60 ℃ through the heat preservation device;
7) the pipe enters a spraying box and is cooled by the spraying box;
8) and (5) traction cutting.
The manufacturing method of the high-rigidity PE pipeline is characterized in that in the step 3), the water temperature in the vacuum sizing box is kept at 40-60 ℃, and the surface temperature of the pipe blank is controlled at 80-100 ℃ when the pipe blank is taken out of the vacuum sizing box.
The manufacturing method of the high-rigidity PE pipeline is characterized in that the temperature adjusting range of the heat treatment device in the step 5) is 120-150 ℃, and the temperature of the outer surface layer of the pipe discharged from the heat treatment device is controlled to be 120-150 ℃.
The manufacturing method of the high-rigidity PE pipeline is characterized in that the heat treatment device in the step 5) is of a hollow structure and comprises a heat treatment drying tunnel, a group of heating pipes are uniformly arranged on the heat treatment drying tunnel along the circumferential direction of an inner cavity of the heat treatment drying tunnel, an iron sheet with holes is arranged on the heat treatment drying tunnel along the circumferential direction of the inner cavity of the heat treatment drying tunnel, the iron sheet is located between the heating pipes and the heat treatment drying tunnel, a hot air circulation channel is formed between the iron sheet and the heat treatment drying tunnel, a hot air outlet is arranged above the hot air circulation channel, and a hot air inlet is arranged below the hot.
The manufacturing method of the high-rigidity PE pipeline is characterized in that two ends of the heat treatment drying tunnel are respectively provided with a first gasket for sealing the joint of the heat treatment drying tunnel.
The manufacturing method of the high-rigidity PE pipeline is characterized in that the length of the heat treatment drying tunnel is 50-150cm, and the heating pipe is an infrared heating pipe.
The manufacturing method of the high-rigidity PE pipeline is characterized in that a temperature sensor is arranged on one side of the heat treatment drying tunnel, the temperature sensor is an infrared temperature sensor, and a temperature controller is connected to the temperature sensor.
The manufacturing method of the high-rigidity PE pipeline is characterized in that heating pipe bases are respectively arranged at two ends of the heating pipe, and the heating pipe is fixed on the heat treatment drying tunnel through the heating pipe bases.
The manufacturing method of the high-rigidity PE pipeline is characterized in that the heat preservation device in the step 6) comprises a group of heat preservation units, each heat preservation unit adopts a sealed box body, gaskets are arranged at two ends of each heat preservation unit respectively, and the two adjacent heat preservation units are sealed through second gaskets.
The manufacturing method of the high-rigidity PE pipeline is characterized in that heat dissipation holes are formed in the upper portion of the heat preservation unit, and flip covers are arranged on the heat dissipation holes.
The invention has the beneficial effects that: through a fractional crystallization method, the crystallinity of the inner wall layer of the PE pipeline is firstly improved, and then the outer surface layer of the pipeline is recrystallized, so that the residual stress is eliminated, and finally the rigidity of the PE pipeline is obviously improved.
Drawings
FIG. 1 is a schematic view of a heat treatment apparatus according to the present invention;
FIG. 2 is a schematic view of the structure of the heat-retaining device of the present invention;
FIG. 3 is a schematic front view of a heat treatment apparatus according to the present invention;
FIG. 4 is a schematic side view of the thermal processing apparatus according to the present invention.
In the figure: 1-a heat treatment device; 101-a hot air circulation channel; 102-a first gasket; 103-heating tube; 104-a temperature sensor; 105-temperature controller; 106-hot air inlet; 107-hot air outlet; 108-iron pieces; 109-heat treatment drying tunnel; 2-a heat preservation device; 201-heat preservation unit.
Detailed Description
The invention is further described with reference to the drawings and examples.
The process flow of the invention is as follows: 1. plasticizing and extruding the raw material → 2, enabling the pipe blank to enter a vacuum sizing box → 3, spraying and cooling the pipe blank in the vacuum sizing box by cooling water → 4, exiting the vacuum sizing box → 5, entering a heat treatment device to heat the outer surface layer of the pipe blank → 6, entering a heat preservation device to slowly cool → 7, cooling by a spraying box → 8, and carrying out traction cutting.
The process difference from the traditional process mainly comprises the following steps: and (3) controlling the temperature of the cooling in the step (3), and adding a step (5) of heating the outer surface layer and a step (6) of slowly cooling by a heat preservation device.
And 3, regulating the water temperature of the vacuum sizing box, wherein the water temperature in the vacuum sizing box is required to be kept at 40-60 ℃ according to the wall thickness of the pipeline and the production speed, so that the surface temperature of the PE pipeline is controlled at 80-100 ℃ when the PE pipeline is taken out of the vacuum sizing box. Through the temperature control of process 3, enable the product size design on the one hand, on the other hand is of value to reducing the influence of pipeline extexine cooling to the inlayer layer to shorten the hot time of process 5 to pipeline extexine, improve the degree of crystallinity of pipeline inner wall simultaneously, traditional pipeline extexine can be cooled off by the cooling water fast when process 2, 3, and the degree of crystallinity is low, exists residual stress.
As shown in fig. 1, 3 and 4, in the process 5, the outer surface layer of the pipeline is heated by a heat treatment device, the heat treatment device is provided with a temperature-controllable channel with a certain length, the suitable length of the channel is 50cm-150cm, and the optimal temperature regulation range comprises 120 ℃ to 150 ℃. The heat treatment device is provided with a temperature detector and a temperature controller, and is used for detecting the temperature of the outer surface layer of the pipeline at the moment when the pipeline is discharged out of the heat treatment device and controlling the temperature of the heated pipeline to be in a set range. The optimal temperature of the outer surface layer of the pipeline when the pipeline is taken out of the heat treatment device is controlled to be 120-150 ℃.
The heat treatment device comprises a heat treatment drying tunnel 109, the length of the inner cavity of the heat treatment drying tunnel 109 of the heat treatment device is 50-150cm, the two ends of the heat treatment drying tunnel 109 are respectively provided with a
The heat treatment drying tunnel 109 is evenly provided with a group of
The heat treatment drying tunnel 109 is provided with an iron sheet 108 with holes along the circumferential direction of the inner cavity of the heat treatment drying tunnel, the iron sheet 108 is positioned between the
A temperature sensor 104 is arranged on one side of the heat treatment drying tunnel 109 and is mainly used for measuring the instantaneous surface temperature of the PE pipeline out of the heating mechanism 1, the temperature sensor 104 is connected with a temperature controller 105, the temperature sensor 104 feeds back the surface temperature of the PE pipeline in real time and feeds back the surface temperature to the temperature controller 105 in time, and the temperature controller 105 rapidly adjusts the temperature; the temperature sensor 104 is an infrared temperature sensor.
The outer surface of the pipeline is heated through the working procedure 5, the temperature of the outer surface can reach 120-150 ℃, so that recrystallization occurs, the residual stress is eliminated, and the heating time of the method for the outer surface only needs to last for 10-30 s. The conventional pipeline is cooled and then is subjected to heat treatment, and the time for cooling and then heat treatment is generally 1-3 h.
As shown in fig. 2, in step 6, the pipe is slowly cooled by keeping the temperature of the pipe at a temperature that is generally composed of a plurality of sections of heat-preserving units, and the pipe is slowly and naturally cooled to a temperature below 60 ℃.
The heat preservation device comprises a group of
Through the heat preservation device in the working procedure 6, the heated outer surface layer and inner wall layer of the pipeline are both slowly cooled, the crystallinity is improved, and the residual stress is reduced.
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