Extrusion die head heated by heat conduction oil and oil temperature control device with extrusion die head
阅读说明：本技术 一种导热油加热的挤出模头及具有其的油温控制装置 (Extrusion die head heated by heat conduction oil and oil temperature control device with extrusion die head ) 是由 刘飞 刘飚 刘权友 陈书安 徐建军 于 2019-03-22 设计创作，主要内容包括：本发明公开了一种导热油加热的挤出模头及油温控制装置,其挤出模头包括：模头本体,模头本体包括固定上模和微调下模,固定上模和微调下模扣合且通过螺栓连接,在其扣合处由上端至下端形成有熔体进口、中间模腔、模唇口；固定上模和微调下模靠近中间模腔处的内壁中均分布有相互独立的方波形导热油流道,且在二者靠近模唇口处的内壁中均分布有相连通的直通导热油流道。其中,方波形导热油流道和直通导热油流道形成双向对流、上下交错的导热油通道,并且导热油在通道中不断循坏,避免了温度传导的死角,从而保证了模头各部分温度的均匀性,减少了模头内部因温度不均匀而产生的析出物,继而使连续生产的时间从1～2天提升至15～20天,提高了生产效率。(The invention discloses an extrusion die head heated by heat conducting oil and an oil temperature control device, wherein the extrusion die head comprises: the die head comprises a die head body, wherein the die head body comprises a fixed upper die and a fine adjustment lower die, the fixed upper die and the fine adjustment lower die are buckled and connected through bolts, and a melt inlet, a middle die cavity and a die lip mouth are formed in the buckled part from the upper end to the lower end; the inner walls of the fixed upper die and the fine adjustment lower die close to the middle die cavity are uniformly distributed with mutually independent square-wave-shaped heat conduction oil flow passages, and the inner walls of the fixed upper die and the fine adjustment lower die close to the die lip are uniformly distributed with communicated straight-through heat conduction oil flow passages. The square-wave heat conduction oil channel and the straight-through heat conduction oil channel form a heat conduction oil channel which is bidirectional convection and vertically staggered, and heat conduction oil continuously circulates in the channel, so that dead angles of temperature conduction are avoided, the uniformity of the temperature of each part of the die head is guaranteed, precipitates generated due to uneven temperature in the die head are reduced, the continuous production time is prolonged from 1-2 days to 15-20 days, and the production efficiency is improved.)
1. An extrusion die head heated by heat transfer oil is characterized by comprising: the die head comprises a die head body (1), wherein the die head body (1) comprises a fixed upper die (2) and a fine-tuning lower die (3), the fixed upper die (2) and the fine-tuning lower die (3) are buckled and connected through bolts, and a melt inlet (4), a middle die cavity (5) and a die lip opening (6) are formed in the buckled part from the upper end to the lower end;
the fixed upper die (2) and the fine-tuning lower die (3) are close to the inner wall of the middle die cavity (5), mutually independent square-wave-shaped heat conduction oil flow channels are uniformly distributed in the inner wall, and communicated straight-through heat conduction oil flow channels are uniformly distributed in the inner wall of the die lip (6) where the fixed upper die and the fine-tuning lower die are close to the inner wall.
2. The extrusion die head heated by heat transfer oil of claim 1, wherein the square wave-shaped heat transfer oil flow passage comprises: a first square wave-shaped heat conduction oil flow passage (7) arranged in the inner wall of the fixed upper die (2) close to the middle die cavity (5) and a second square wave-shaped heat conduction oil flow passage (8) arranged in the inner wall of the fine adjustment lower die (3) close to the middle die cavity (5);
a first oil inlet (9) of the first square-wave-shaped heat-conducting oil flow passage (7) is formed in the top of one end, close to the fixed upper die (2), of the fixed upper die, and a first oil return opening (10) of the first square-wave-shaped heat-conducting oil flow passage is formed in the top of the other end, close to the fixed upper die (2);
and a second oil return port (11) of the second square-wave-shaped heat-conducting oil flow channel (8) is formed in the top close to one end of the fine adjustment lower die (3), and a second oil inlet (12) of the second square-wave-shaped heat-conducting oil flow channel is formed in the top at the other end of the fine adjustment lower die (3).
3. A diathermic oil heated extrusion die according to claim 1 or 2, characterised in that the through diathermic oil flow channel comprises: a first straight-through heat conduction oil flow channel (13) arranged in the inner wall of the fixed upper die (2) close to the die lip opening (6) and a second straight-through heat conduction oil flow channel (14) arranged in the inner wall of the fine adjustment lower die (3) close to the die lip opening (6);
a third oil return port (15) of the first straight heat conduction oil flow passage (13) is arranged at one end of the fixed upper die (2), and a third oil inlet (16) of the first straight heat conduction oil flow passage is arranged at the other end of the fixed upper die (2);
a fourth oil inlet (17) of the second straight-through heat conduction oil flow passage (14) is arranged at one end of the fine adjustment lower die (3), and a fourth oil return port (18) of the second straight-through heat conduction oil flow passage is arranged at the other end of the fine adjustment lower die (3);
the third oil return port (15) is communicated with the fourth oil inlet (17) through a pipeline.
4. A heat transfer oil heated extrusion die head according to claim 2, wherein the first square wave shaped heat transfer oil flow passage (7) and the second square wave shaped heat transfer oil flow passage (8) are identical in structure and both comprise: transverse flow channels (19) distributed up and down and a plurality of longitudinal flow channels (20) connected between the transverse flow channels (19).
5. The extrusion die head heated by conduction oil of claim 4, characterized in that the fabrication holes of the transverse flow channel (19) are arranged on the two side end faces of the die head body (1), and a first blocking head (21) is arranged in the fabrication holes; the technical hole of the longitudinal runner (20) is arranged on the upper end surface of the die head body (1), and a second blocking head (22) is arranged in the technical hole;
and a plurality of third sealing plugs (23) for forming the square-wave-shaped heat conduction oil flow channel are arranged in the transverse flow channel (19) at intervals.
6. The extrusion die head heated by heat transfer oil of claim 1, wherein the fixed upper die (2) and the fine adjustment lower die (3) are both of a strip-shaped structure, and a plurality of first temperature sensors (24) are uniformly distributed at the bottom of the fixed upper die (2) along the length direction of the fixed upper die; finely tune lower mould (3) bottom and prolong its length direction equipartition and have second temperature sensor (25), first temperature sensor (24) with second temperature sensor (25) symmetry sets up, and all is close to middle die cavity (5) with die lip (6) set up to all be connected with external control by temperature change table electricity.
7. An oil temperature control device characterized by comprising: the die head body (1) of any one of claims 1 to 6, a first oil temperature machine, a second oil temperature machine and a third oil temperature machine, wherein the square wave-shaped heat conduction oil flow passage on the fixed upper die (2) is communicated with the first oil temperature machine through a pipeline; the square-wave-shaped heat conduction oil flow channel on the fine adjustment lower die (3) is communicated with the second oil temperature machine through a pipeline; the straight-through heat conduction oil flow channel is communicated with the third oil temperature machine through a pipeline.
8. The oil temperature control device according to claim 7, wherein an oil outlet of the first oil temperature machine is communicated with the first oil inlet (9) through a pipeline, and an oil return port of the first oil temperature machine is communicated with the first oil return port (10); an oil outlet on the second oil temperature machine is communicated with the first oil inlet (12) through a pipeline, and an oil return port on the second oil temperature machine is communicated with the second oil return port (11) through a pipeline; an oil outlet of the third oil temperature machine is communicated with a third oil inlet (16) through a pipeline, and an oil return port of the third oil temperature machine is communicated with a fourth oil return port (18) through a pipeline.
Technical Field
The invention relates to the technical field of breathable film production, in particular to an extrusion die head heated by heat conduction oil and an oil temperature control device with the same.
Background
The existing die head used in the PE breathable film extruder adopts an integral electric heating rod (see figure 1), in the heating process, a local high temperature (local temperature can reach 600-700 ℃) is easily formed at a position close to the heating rod, and the temperature of a region far away from the heating rod is low due to heat conduction loss, so that the integral temperature of the die head has a large temperature difference, more precipitates are easily formed at a die opening, and the quality of a film product is influenced; meanwhile, in order to ensure the quality of the product, a manufacturer must stop production after 1-2 days of production, and open a die head to clean precipitates in the die head so as to continue production, thereby affecting the continuity of production.
In addition, because the heating rod is integrally embedded into the die for installation, the structure is hidden, when the heating rod is damaged, the problem is difficult to find in a short time, the temperature difference of each area of the die body can be further enlarged, the generation speed of precipitates is accelerated, and therefore the quality of a thin film product is influenced, and the number of times of shutdown is increased.
Therefore, it is an urgent need to solve the problems of the art to provide a heat transfer oil heated extrusion die and an oil temperature control device having the same, which can reduce precipitates, prolong a continuous production time, and improve production efficiency.
Disclosure of Invention
In view of the above, the present invention provides a heat transfer oil heated extrusion die capable of reducing precipitates, extending a continuous production time, and improving production efficiency, and an oil temperature control apparatus having the same.
In order to achieve the purpose, the invention adopts the following technical scheme: an extrusion die heated by heat transfer oil, comprising: the die head comprises a die head body, wherein the die head body comprises a fixed upper die and a fine adjustment lower die, the fixed upper die and the fine adjustment lower die are buckled and connected through bolts, and a melt inlet, a middle die cavity and a die lip mouth are formed in the buckled part from the upper end to the lower end;
the inner walls of the fixed upper die and the fine adjustment lower die, which are close to the middle die cavity, are uniformly distributed with mutually independent square-wave-shaped heat conduction oil flow channels, and the inner walls of the fixed upper die and the fine adjustment lower die, which are close to the die lip, are uniformly distributed with communicated straight-through heat conduction oil flow channels.
According to the technical scheme, compared with the prior art, the extrusion die head heated by the heat conduction oil is provided, the square wave-shaped heat conduction oil flow channel and the straight-through heat conduction oil flow channel are respectively arranged near the middle die cavity and the die lip, so that the die head body can be integrally heated by the heat conduction oil, and compared with a heating mode of an electric heating rod, the temperature uniformity of each part of the die head body is effectively ensured, the generation of precipitates is reduced, the continuous production time is prolonged, and the production efficiency of a thin film product is improved.
In order to optimize the above technical solution, the square wave-shaped heat transfer oil flow channel includes: the first square-wave-shaped heat-conducting oil flow channel is arranged in the inner wall of the fixed upper die close to the middle die cavity, and the second square-wave-shaped heat-conducting oil flow channel is arranged in the inner wall of the fine-tuning lower die close to the middle die cavity;
a first oil inlet of the first square-wave-shaped heat-conducting oil flow passage is arranged at the top close to one end of the fixed upper die, and a first oil return opening of the first square-wave-shaped heat-conducting oil flow passage is arranged at the top close to the other end of the fixed upper die;
and a second oil return port of the second square-wave-shaped heat-conducting oil flow channel is formed in the top close to one end of the fine adjustment lower die, and a second oil inlet of the second square-wave-shaped heat-conducting oil flow channel is formed in the top at the other end of the fine adjustment lower die.
The beneficial effect that adopts above-mentioned technical scheme to produce is that the business turn over hydraulic fluid port of first square wave form heat conduction oil runner and second square wave form heat conduction oil runner sets up relatively, improves the temperature homogeneity of middle die cavity.
In order to optimize the above technical solution, the straight-through conduction oil flow path includes: the first straight-through heat conduction oil flow channel is arranged in the inner wall, close to the die lip, of the upper fixed die, and the second straight-through heat conduction oil flow channel is arranged in the inner wall, close to the die lip, of the lower fine adjustment die;
a third oil return port of the first straight heat conduction oil flow passage is arranged at one end of the fixed upper die, and a third oil inlet port of the first straight heat conduction oil flow passage is arranged at the other end of the fixed upper die;
a fourth oil inlet of the second straight-through heat conduction oil flow passage is arranged at one end of the fine adjustment lower die, and a fourth oil return port of the second straight-through heat conduction oil flow passage is arranged at the other end of the fine adjustment lower die;
and the third oil return port is communicated with the fourth oil inlet through a pipeline.
The technical scheme has the beneficial effects that the oil inlets and the oil outlets of the first straight-through heat conduction oil flow passage and the second straight-through heat conduction oil flow passage are oppositely arranged, so that the temperature uniformity of the die lip opening is improved; and the heat conduction oil channels which are in bidirectional convection and vertically staggered can be formed by combining the first square-wave-shaped heat conduction oil channel and the second square-wave-shaped heat conduction oil channel, so that dead corners of temperature conduction are avoided to the maximum extent, the uniformity of the temperature of each part of the die head body is ensured, precipitates generated by the die head body due to uneven temperature are reduced, the continuous production time is prolonged from 1-2 days to 15-20 days, and the production efficiency of the film is improved.
In order to optimize the above technical solution, the first square waveform heat transfer oil flow passage and the second square waveform heat transfer oil flow passage have the same structure, and both of them include: the device comprises transverse flow passages distributed up and down and a plurality of longitudinal flow passages connected between the transverse flow passages.
The beneficial effect that adopts above-mentioned technical scheme to produce is, can increase the homogeneity of the temperature of middle die cavity.
The technical hole of the transverse flow channel is arranged on the end face of the die head body, and a first blocking head is arranged in the technical hole; the process hole of the longitudinal runner is arranged on the upper end surface of the die head body, and a second plugging head is arranged in the process hole;
and a plurality of third sealing plugs used for forming the square-wave-shaped heat conduction oil flow channel are arranged in the transverse flow channel at intervals.
In order to optimize the technical scheme, the fixed upper die and the fine adjustment lower die are both of a strip-shaped structure, wherein a plurality of first temperature sensors are uniformly distributed at the bottom of the fixed upper die along the length direction of the fixed upper die; the bottom of the fine adjustment lower die is uniformly distributed with second temperature sensors along the length direction, the first temperature sensors and the second temperature sensors are symmetrically arranged and are close to the middle die cavity and the die lip, and the first temperature sensors and the second temperature sensors are electrically connected with an external temperature control meter.
Adopt the beneficial effect that above-mentioned technical scheme produced to be, staff's accessible temperature control table real time monitoring die head body inside temperature to master the die head body and heat the condition.
An oil temperature control device comprising: the square-wave heat-conducting oil flow channel on the fixed upper die is communicated with the first oil temperature machine through a pipeline; the multi-section square-wave-shaped heat conduction oil flow channel on the fine adjustment lower die is communicated with the second oil temperature machine through a pipeline; the straight-through heat conduction oil flow channel is communicated with the third oil temperature machine through a pipeline. The first oil temperature machine, the second oil temperature machine and the third oil temperature machine can enable heat conduction oil to circularly flow in the die head body, the overall temperature of the die head body is controlled by controlling the temperature and the flow rate of the heat conduction oil, and the temperature in the die head body can be kept constant, so that the quality of a film product is effectively improved.
An oil outlet on the first oil temperature machine is communicated with the first oil inlet through a pipeline, and an oil return port on the first oil temperature machine is communicated with the first oil return port; an oil outlet on the second oil temperature machine is communicated with the first oil inlet through a pipeline, and an oil return port on the second oil temperature machine is communicated with the second oil return port through a pipeline; an oil outlet of the third oil temperature machine is communicated with a third oil inlet through a pipeline, and an oil return port of the third oil temperature machine is communicated with a fourth oil return port through a pipeline.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional die head employing an electric heating rod for integral heating.
FIG. 2 is a schematic perspective view of an extrusion die head heated by heat transfer oil according to the present invention.
Figure 3 is a cross-sectional view of the figure of figure 2.
FIG. 4 is a schematic illustration of the melt inlet, intermediate mold cavity configuration of FIG. 2.
Fig. 5 is a sectional view of the stationary upper die.
FIG. 6 is a cross-sectional view of the trim lower die.
Fig. 7 is a schematic structural view of a partially enlarged view a in fig. 5.
Wherein: 1-a die head body, 2-a fixed upper die, 3-a fine-tuning lower die, 4-a melt inlet, 5-an intermediate die cavity, 6-a die lip, 7-a first square-wave-shaped heat-conducting oil flow passage, 8-a second square-wave-shaped heat-conducting oil flow passage, 9-a first oil inlet, 10-a first oil return port, 11-a second oil return port, 12-a second oil inlet, 13-a first straight-through heat-conducting oil flow passage, 14-a second straight-through heat-conducting oil flow passage, 15-a third oil return port, 16-a third oil inlet, 17-a fourth oil inlet, 18-a fourth oil return port, 19-a transverse flow passage, 20-a longitudinal flow passage, 21-a first sealing head, 22-a second sealing head, 23-a third sealing head, 24-a first temperature sensor, 25-a second temperature sensor, 100-electric heating rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2 to 7, the embodiment of the invention discloses an extrusion die heated by heat transfer oil, comprising: the die head comprises a die head body 1, wherein the die head body 1 comprises a fixed upper die 2 and a fine adjustment lower die 3 which are equal in length, the fixed upper die 2 and the fine adjustment lower die 3 are buckled and connected through bolts, a melt inlet 4, a
the inner walls of the fixed upper die 2 and the fine tuning lower die 3 close to the
Referring to fig. 5 to 6, the square wave-shaped heat transfer oil flow passage includes: a first square wave-shaped heat conduction oil flow passage 7 arranged in the inner wall of the fixed upper die 2 close to the
a first oil inlet 9 of the first square wave-shaped heat conduction oil flow passage 7 is arranged at the top close to one end of the fixed upper die 2, and a first oil return opening 10 of the first square wave-shaped heat conduction oil flow passage is arranged at the top close to the other end of the fixed upper die 2;
and a second oil return port 11 of the second square-wave-shaped heat-conducting
The direct conduction oil flow channel comprises: a first through heat conduction oil flow passage 13 arranged in the inner wall of the fixed upper die 2 close to the die lip 6 and a second through heat conduction
a third oil return port 15 of the first straight heat conduction oil flow passage 13 is arranged at one end of the fixed upper die 2, and a third oil inlet port 16 of the first straight heat conduction oil flow passage is arranged at the other end of the fixed upper die 2;
a
wherein, the third oil return port 15 is communicated with the
The arrangement of the flow channel forms a heat conduction oil channel with bidirectional convection and up-down staggering after the fixed upper die and the fine adjustment lower die are buckled, so that dead angles of temperature conduction are avoided to the maximum extent, and the uniformity of the temperature of each part of the die head body is ensured.
The first square wave-shaped heat conduction oil flow channel 7 and the second square wave-shaped heat conduction
The fabrication hole of the transverse flow passage 19 is arranged on the end surface of the die head body 1, and a first plugging
wherein, a plurality of third sealing plugs 23 for forming a square wave-shaped heat transfer oil flow passage are arranged in the transverse flow passage 19.
The fixed upper die 2 and the fine adjustment lower die 3 are both of strip-shaped structures, wherein a plurality of first temperature sensors 24 are uniformly distributed at the bottom of the fixed upper die 2 along the length direction of the fixed upper die; the bottom of the fine adjustment lower die 3 is uniformly provided with second temperature sensors 25 along the length direction, the first temperature sensors 24 and the second temperature sensors 25 are symmetrically arranged and are close to the
The present invention also provides an oil temperature control device, including: the die head comprises a die head body 1, a first oil temperature machine, a second oil temperature machine and a third oil temperature machine, wherein a square-wave heat-conducting oil flow channel on a fixed upper die 2 is communicated with the first oil temperature machine through a pipeline; the square-wave-shaped heat-conducting oil flow channel on the fine-tuning lower die 3 is communicated with a second oil temperature machine through a pipeline; the straight-through heat conduction oil flow channel is communicated with the third oil temperature machine through a pipeline.
Specifically, an oil outlet on the first oil temperature machine is communicated with a first oil inlet 9 through a pipeline, and an oil return port on the first oil temperature machine is communicated with a first oil return port 10; an oil outlet on the second oil temperature machine is communicated with the
Starting a first oil temperature machine (not marked), a second oil temperature machine (not marked) and a third oil temperature machine (not marked), heating heat conduction oil to a set temperature and keeping the temperature constant, and then continuously circulating the heat conduction oil in the die head body through an oil pump and a pipeline so as to heat the die head body to the set process temperature and keep the temperature constant; meanwhile, as the heat conduction oil circularly flows in the die head, the overall temperature of the die head body can be controlled by controlling the temperature and the flow rate of the heat conduction oil; and the heat conduction oil flow channels (the square wave-shaped heat conduction oil flow channel and the straight-through heat conduction oil flow channel) in the die head body adopt a bidirectional convection and up-and-down staggered mode (see figures 5-6) during design, so that dead angles of temperature conduction are avoided to the maximum extent, the uniformity of the temperature of each part of the die head is ensured, precipitates generated due to uneven temperature in the die head are reduced, the continuous production time is prolonged from 1-2 days to 15-20 days, and the production efficiency is improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.