A film head cooling mechanism for a film blowing machine

Abstract

The utility model discloses a film head cooling mechanism for a film blowing machine, which relates to the relevant field of film blowing machines, and is designed to solve the problem in the prior art that the cooling medium and the uppermost end of the film head are directly heat exchanged, the temperature difference is too large, the internal plastic raw materials are quickly cooled, and some raw materials are easily cooled and formed inside the film head, which affects the film discharge and formation, and is easy to block the discharge channel. The first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel are all spirally arranged, and the internal medium flow direction of the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel is opposite to the internal medium flow direction of the film head for the film blowing machine.

Description

Technical Field

[0001] The utility model relates to the relevant field of film blowing machines, in particular to a film head cooling mechanism for film blowing machines. Background Art

[0002] The film blowing machine is a key equipment widely used in the plastic processing industry. Its core function is to extrude molten plastic and blow it into a continuous film. This type of equipment is widely used in packaging, agriculture, construction, electronics and other fields, and plays a vital role in meeting the market demand for high-quality, multifunctional plastic films. The film blowing machine is usually composed of an extrusion system, a film head, a traction device, a winding device, etc. Among them, the film head is a key component, and its performance directly affects key indicators such as film thickness uniformity, transparency and tensile strength. During the film blowing process, the high temperature and high pressure environment inside the film head extrude and stretch the plastic raw materials, while the outside of the film head is in contact with the air, forming a temperature difference.

[0003] The film head for film blowing machine is complex in design and needs to withstand high temperature and high pressure working environment while ensuring uniform extrusion of plastic melt. The shape and size of the film head are adjusted according to production requirements to adapt to the production of films of different thicknesses and widths. It is very important to effectively cool the film head. Through reasonable cooling design, the temperature of the film head can be reduced and its working stability can be maintained, thereby improving the production quality and efficiency of the film. For example, in the Chinese authorized patent (film blowing machine film head cooling mechanism) with announcement number CN221873119U, the cooling oil enters the circulation pipeline of the film head along the cooling pipeline, and then enters the inner spiral cooling pipe. The inner spiral cooling pipe is located in the middle of the film head and can evenly absorb the heat in the middle part during the working process to avoid local temperature accumulation. After absorbing the heat, the cooling oil flows back to the cooling pipeline through the circulation pipeline, and then enters the single main pipe of the heat dissipation component through the cooling pipeline, and finally enters the circulating cooling pipe network. The circulating cooling pipe network is an "S" shaped structure, which contacts the cooling water in the cooling pool, conducts the heat to the cooling water, and achieves heat dissipation.

[0004] Although the above-mentioned prior art has the function of cooling the membrane head, the cooling medium is directly passed into multiple inner spiral cooling tubes, and the entrance end of the uppermost inner spiral cooling tube directly exchanges heat with the uppermost end of the membrane head. At this time, the temperature difference is too large and the heat exchange efficiency is high, which causes the internal plastic raw materials to cool down quickly. Some raw materials are easily cooled and formed inside the membrane head, which affects the discharge and forming of the film and easily blocks the discharge channel. Utility Model Content

[0005] The purpose of the utility model is to provide a film head cooling mechanism for a film blowing machine, so as to solve the problem proposed in the above background technology that the cooling medium directly exchanges heat with the uppermost end of the film head, the temperature difference is too large, the internal plastic raw materials are quickly cooled, and part of the raw materials are easily cooled and formed inside the film head, which affects the discharge and forming of the film and easily blocks the discharge channel.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a film head cooling and cooling mechanism for a film blowing machine, based on the existence of a film core body, a film head middle seat and a film head outer cylinder, a feed pipe is arranged on the film core body, a feed channel is arranged on the film head outer cylinder at a position corresponding to the feed pipe, and flow channels are arranged at the upper and lower ends between the film core body and the film head outer cylinder, and the film head outer cylinder comprises a second fixed disk, and a first heat exchange medium flow channel, a second heat exchange medium flow channel and a third heat exchange medium flow channel are opened in an annular array inside the second fixed disk. The mass flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel, the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel are all spirally arranged, and the internal medium flow direction of the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel is opposite to the internal medium flow direction of the film head of the film blowing machine.

[0007] Preferably, an external heat exchange medium cooling ring is arranged outside the second fixed disk, and the second fixed disk and the external heat exchange medium cooling ring are fixed via an intermediate connecting ring.

[0008] Preferably, a heat exchange medium inlet channel is opened at the lower end of the inner part of the external heat exchange medium cooling ring, and a heat exchange medium inlet pipe is installed at the outer lower end of the external heat exchange medium cooling ring, and the heat exchange medium inlet pipe is connected to the inner part of the heat exchange medium inlet channel.

[0009] Preferably, a heat exchange medium outflow channel is opened at the inner upper end of the outer heat exchange medium cooling ring, and a heat exchange medium outlet pipe is installed at the outer upper end of the outer heat exchange medium cooling ring, and the heat exchange medium outlet pipe is connected to the inner part of the heat exchange medium outflow channel.

[0010] Preferably, an upper connecting pipe is installed in the upper annular array between the second fixed disk and the external heat exchange medium cooling ring, and one end of the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel are connected to the heat exchange medium outflow channel through the upper connecting pipe; a lower connecting pipe is installed in the lower annular array between the second fixed disk and the external heat exchange medium cooling ring, and the other end of the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel are connected to the heat exchange medium inflow channel through the lower connecting pipe.

[0011] Preferably, a spiral flow channel is provided on the outer surface of the core body of the membrane core body; the outer cylinder body of the membrane head also includes a first fixed disk and an outer cylinder body, the first fixed disk is integrally connected to the upper end of the outer cylinder body, the outer cylinder body is located outside the spiral flow channel of the membrane core body and fits the outer surface of the core body of the membrane core body, a spiral cooling air duct is provided in the outer cylinder body, an air inlet pipe is installed at the lower end of the outer part of the outer cylinder body, and an air outlet pipe is installed at the upper end of the outer part of the outer cylinder body, and the air inlet pipe, the cooling air duct and the air outlet pipe are internally connected.

[0012] Preferably, the second fixed disk is integrally connected to the lower end of the outer cylinder body, and a discharge flow channel is formed between the second fixed disk and the membrane head middle seat, and the discharge flow channel is in communication with the feed pipe, feed channel, upper flow channel, spiral flow channel and lower flow channel.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) In the utility model, a plurality of spiral heat exchange medium flow channels are provided in the annular array inside the second fixed disk, and these flow channels are all spirally arranged, and the medium flow direction is opposite to the discharge direction of the molten plastic, so that the cooled heat exchange medium exchanges heat with the entrance position of the discharge flow channel, and the uncooled heat exchange medium exchanges heat with the position close to the film discharge, so that the heat exchange efficiency between the film and the cooling medium is gradually improved when the film is discharged, avoiding direct heat exchange between the cooling medium and the uppermost end of the film head, and gradually cooling the internal plastic raw material, and preventing premature cooling and forming. This solves the problem that the cooling medium and the uppermost end of the film head are directly exchanged with each other, the temperature difference is too large, the internal plastic raw material cools down quickly, and part of the raw material is easily cooled and formed inside the film head, affecting the film discharge and forming, and easily blocking the discharge channel;

[0015] (2) In the utility model, the first heat exchange medium flow channel, the second heat exchange medium flow channel, the third heat exchange medium flow channel, the fourth heat exchange medium flow channel, the fifth heat exchange medium flow channel and the sixth heat exchange medium flow channel are evenly arranged, so that the heat exchange medium in the multi-medium flow channel cools the material evenly during discharge, ensuring that the molten plastic is evenly cooled during the extrusion process, thereby significantly improving the film quality;

[0016] (3) In the utility model, the external blower delivers the external airflow into the cooling air duct through the air inlet pipe. The flow of the airflow inside the cooling air duct can take away the high-temperature gas inside the cooling air duct and flow out through the air outlet pipe, so that the temperature of the molten plastic is initially reduced. This is mainly to initially reduce the temperature of the plastic, and cooperate with the subsequent heat exchange medium cooling to achieve gradient cooling, which is beneficial to the quality of the film;

[0017] (4) In the utility model, by optimizing the cooling medium flow channel design and the airflow cooling method, the consumption of cooling medium and the waste of energy are reduced, thereby reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a film head cooling mechanism for a film blowing machine from a main perspective of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of a film head cooling mechanism for a film blowing machine from a bottom perspective of the utility model;

[0020] Figure 3 It is a top view of a film head cooling mechanism for a film blowing machine according to the utility model;

[0021] Figure 4 This is a cross-sectional view of the AA portion of a film head cooling mechanism for a film blowing machine according to the utility model;

[0022] Figure 5 This is a front view of a film head cooling mechanism for a film blowing machine according to the utility model;

[0023] Figure 6 This is a cross-sectional view of a film head cooling mechanism for a film blowing machine at position BB of the utility model;

[0024] Figure 7 This is a cross-sectional view of the CC portion of a film head cooling mechanism for a film blowing machine according to the utility model;

[0025] Figure 8 It is a structural schematic diagram of a film core body of a film head cooling mechanism for a film blowing machine according to the utility model;

[0026] Fig. 9 It is a structural schematic diagram of a film head outer cylinder of a film head cooling mechanism for a film blowing machine according to the utility model;

[0027] Fig.10 The utility model discloses a pipeline layout diagram on an external heat exchange medium cooling ring of a film head cooling mechanism for a film blowing machine.

[0028] In the figure: 1. membrane core body; 2. spiral flow channel; 3. membrane head middle seat; 4. membrane head outer cylinder; 5. first fixed disk; 6. outer cylinder body; 7. second fixed disk; 8. discharge flow channel; 9. air inlet pipe; 10. cooling air channel; 11. air outlet pipe; 12. external heat exchange medium cooling ring; 13. heat exchange medium inflow channel; 14. heat exchange medium inlet pipe; 15. heat exchange medium outflow channel; 16. heat exchange medium outlet pipe; 17. middle connecting ring; 18. upper connecting pipe; 19. lower connecting pipe; 20. first heat exchange medium flow channel; 21. second heat exchange medium flow channel; 22. third heat exchange medium flow channel; 23. fourth heat exchange medium flow channel; 24. fifth heat exchange medium flow channel; 25. sixth heat exchange medium flow channel. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] See also Figure 1-10 , an embodiment provided by the utility model:

[0031] (1) Membrane head body:

[0032] It includes a membrane core body 1, a membrane head middle seat 3 and a membrane head outer cylinder 4. A spiral flow channel 2 is opened on the core outer surface of the membrane core body 1, and the molten plastic flows in the spiral flow channel 2 to increase the cooling area and time; a feed pipe is arranged on the membrane core body 1 for introducing molten plastic, and a feed channel is arranged on the membrane head outer cylinder 4 at a position corresponding to the feed pipe, and flow channels are arranged at the upper and lower ends between the membrane core body 1 and the membrane head outer cylinder 4, and the membrane head outer cylinder 4 includes a second fixed disk 7, a first fixed disk 5 and an outer cylinder body 6, the first fixed disk 5 is integrally connected to the upper end of the outer cylinder body 6, the outer cylinder body 6 is located outside the spiral flow channel 2 of the membrane core body 1 and fits the core outer surface of the membrane core body 1, a spiral cooling air duct 10 is opened in the outer cylinder body 6, an air inlet pipe 9 is installed at the lower end of the outer cylinder body 6, and an air outlet pipe 11 is installed at the upper end of the outer cylinder body 6, and the air inlet pipe 9, the cooling air duct 10 and the air outlet pipe 11 are internally connected. The second fixed disc 7 is integrally connected to the lower end of the outer cylinder body 6, and a discharge flow channel 8 is formed between the second fixed disc 7 and the membrane head middle seat 3 to ensure that the molten plastic is smoothly extruded after cooling. The discharge flow channel 8 is in communication with the feed pipe, the feed channel, the upper flow channel, the spiral flow channel 2 and the lower flow channel;

[0033] (2) Heat exchange medium flow channel:

[0034] The second fixed disk 7 has a first heat exchange medium flow channel 20, a second heat exchange medium flow channel 21, a third heat exchange medium flow channel 22, a fourth heat exchange medium flow channel 23, a fifth heat exchange medium flow channel 24 and a sixth heat exchange medium flow channel 25 in an annular array inside. These flow channels are all spirally arranged, and the medium flow direction is opposite to the molten plastic discharge direction. The spiral heat exchange medium flow channel design increases the heat exchange area, and the reverse flow allows the cooled heat exchange medium to exchange heat with the entry position of the discharge flow channel 8, while the uncooled heat exchange medium exchanges heat with the position close to the film discharge, so that the heat exchange efficiency between the film and the cooling medium is gradually improved when the film is discharged, making the cooling more uniform and efficient;

[0035] (3) Design of external heat exchange medium cooling ring and connecting pipe:

[0036] An external heat exchange medium cooling ring 12 is provided on the outside of the second fixed disk 7, and the second fixed disk 7 and the external heat exchange medium cooling ring 12 are fixed by an intermediate connecting ring 17. A heat exchange medium inlet channel 13 is provided at the lower end of the inside of the external heat exchange medium cooling ring 12, and a heat exchange medium inlet pipe 14 is installed at the lower end of the outside, and the heat exchange medium inlet pipe 14 is connected with the inside of the heat exchange medium inlet channel 13; a heat exchange medium outflow channel 15 is provided at the upper end of the inside, and a heat exchange medium outlet pipe 16 is installed at the upper end of the outside, and the heat exchange medium outlet pipe 16 is connected with the inside of the heat exchange medium outflow channel 15. An upper connecting pipe 18 and a lower connecting pipe 19 are installed in a ring array between the second fixed disk 7 and the external heat exchange medium cooling ring 12, which are used to connect the heat exchange medium flow channel and the heat exchange medium inflow / outflow channel. The design of the external heat exchange medium cooling ring and the connecting pipe allows the heat exchange medium to flow smoothly, improves the heat exchange efficiency, and is easy to maintain and replace;

[0037] (4) Cooling air duct design:

[0038] A spiral cooling air duct 10 is provided in the outer cylinder body 6, an air inlet pipe 9 is installed at the outer lower end, and an air outlet pipe 11 is installed at the outer upper end. The spiral cooling air duct design increases the contact area and time between the airflow and the membrane head, and improves the airflow cooling effect.

[0039] Working principle: The molten plastic reaches one end between the membrane core body 1 and the outer cylinder body 6 through the feed pipe on the membrane core body 1 and the feed pipe on the first fixed plate 5, and reaches the other end between the membrane core body 1 and the outer cylinder body 6 along the spiral flow channel 2 on the membrane core body 1, and then is discharged through the discharge channel 8 between the second fixed plate 7 and the membrane head middle seat 3.

[0040] The external blower delivers the external airflow into the cooling air duct 10 through the air inlet pipe 9. The flow of the airflow inside the cooling air duct 10 can take away the high-temperature gas inside the cooling air duct 10 and flow out through the air outlet pipe 11, so that the temperature of the molten plastic is initially reduced.

[0041] The external pump body delivers the heat exchange medium into the heat exchange medium inlet channel 13 through the heat exchange medium inlet pipe 14, and then delivers it into the first heat exchange medium flow channel 20, the second heat exchange medium flow channel 21, the third heat exchange medium flow channel 22, the fourth heat exchange medium flow channel 23, the fifth heat exchange medium flow channel 24 and the sixth heat exchange medium flow channel 25 through the lower connecting pipe 19. The heat exchange medium cools the molten plastic in a direction opposite to the discharge direction of the molten plastic. The post-cooled heat exchange medium is collected into the heat exchange medium outflow channel 15 through the upper connecting pipe 18, and then flows out through the heat exchange medium outlet pipe 16.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A film head cooling mechanism for a film blowing machine, based on the presence of a film core body (1), a film head middle seat (3) and a film head outer cylinder (4), a feed pipe is arranged on the film core body (1), a feed channel is arranged on the film head outer cylinder (4) at a position corresponding to the feed pipe, and flow channels are arranged at the upper and lower ends between the film core body (1) and the film head outer cylinder (4), characterized in that: The outer cylinder (4) of the film head comprises a second fixed disk (7), and the second fixed disk (7) has a first heat exchange medium flow channel (20), a second heat exchange medium flow channel (21), a third heat exchange medium flow channel (22), a fourth heat exchange medium flow channel (23), a fifth heat exchange medium flow channel (24) and a sixth heat exchange medium flow channel (25) in an annular array inside. The first heat exchange medium flow channel (20), the second heat exchange medium flow channel (21), the third heat exchange medium flow channel (22), the fourth heat exchange medium flow channel (23), the fifth heat exchange medium flow channel (24) and the sixth heat exchange medium flow channel (25) are all spirally arranged, and the internal medium flow direction of the first heat exchange medium flow channel (20), the second heat exchange medium flow channel (21), the third heat exchange medium flow channel (22), the fourth heat exchange medium flow channel (23), the fifth heat exchange medium flow channel (24) and the sixth heat exchange medium flow channel (25) is opposite to the internal medium flow direction of the film head for the film blowing machine.

2. The film head cooling mechanism for a film blowing machine according to claim 1, characterized in that: An external heat exchange medium cooling ring (12) is arranged outside the second fixed disk (7), and the second fixed disk (7) and the external heat exchange medium cooling ring (12) are fixed via an intermediate connecting ring (17).

3. The film head cooling mechanism for a film blowing machine according to claim 2, characterized in that: A heat exchange medium inlet channel (13) is provided at the lower inner end of the external heat exchange medium cooling ring (12), and a heat exchange medium inlet pipe (14) is installed at the lower outer end of the external heat exchange medium cooling ring (12), and the heat exchange medium inlet pipe (14) is connected to the inside of the heat exchange medium inlet channel (13).

4. The film head cooling mechanism for a film blowing machine according to claim 3, characterized in that: A heat exchange medium outflow channel (15) is provided at the upper inner end of the external heat exchange medium cooling ring (12), and a heat exchange medium outlet pipe (16) is installed at the upper outer end of the external heat exchange medium cooling ring (12), and the heat exchange medium outlet pipe (16) is connected to the inside of the heat exchange medium outflow channel (15).

5. The film head cooling mechanism for a film blowing machine according to claim 4, characterized in that: An upper connecting pipe (18) is installed in the upper annular array between the second fixed disk (7) and the external heat exchange medium cooling ring (12); one end of the first heat exchange medium flow channel (20), the second heat exchange medium flow channel (21), the third heat exchange medium flow channel (22), the fourth heat exchange medium flow channel (23), the fifth heat exchange medium flow channel (24) and the sixth heat exchange medium flow channel (25) are connected to the heat exchange medium outflow channel (15) through the upper connecting pipe (18); and a lower connecting pipe (19) is installed in the lower annular array between the second fixed disk (7) and the external heat exchange medium cooling ring (12); the other ends of the first heat exchange medium flow channel (20), the second heat exchange medium flow channel (21), the third heat exchange medium flow channel (22), the fourth heat exchange medium flow channel (23), the fifth heat exchange medium flow channel (24) and the sixth heat exchange medium flow channel (25) are connected to the heat exchange medium inflow channel (13) through the lower connecting pipe (19).

6. The film head cooling mechanism for a film blowing machine according to claim 1, characterized in that: The outer surface of the core body of the membrane core body (1) is provided with a spiral flow channel (2); the outer cylinder body (4) of the membrane head further comprises a first fixed disk (5) and an outer cylinder body (6); the first fixed disk (5) is integrally connected to the upper end of the outer cylinder body (6); the outer cylinder body (6) is located outside the spiral flow channel (2) of the membrane core body (1) and fits the outer surface of the core body of the membrane core body (1); a spiral cooling air duct (10) is provided inside the outer cylinder body (6); an air inlet pipe (9) is installed at the lower end of the outer cylinder body (6); an air outlet pipe (11) is installed at the upper end of the outer cylinder body (6); the air inlet pipe (9), the cooling air duct (10) and the air outlet pipe (11) are internally connected.

7. A film head cooling mechanism for a film blowing machine according to claim 6, characterized in that: The second fixed disc (7) is integrally connected to the lower end of the outer cylinder body (6), and a discharge flow channel (8) is formed between the second fixed disc (7) and the membrane head middle seat (3), and the discharge flow channel (8) is in communication with the feed pipe, the feed channel, the upper flow channel, the spiral flow channel (2) and the lower flow channel.

Images