A water-cooled film thickness control device

Abstract

The present invention belongs to the technical field of blown film equipment and discloses a water-cooled film thickness control device, comprising a cooling ring, multiple cooling chambers, multiple water inlet pipes, and multiple water outlet pipes. The cooling ring is provided with multiple, unconnected cooling chambers, which are evenly distributed around the central axis of the cooling ring. For each cooling chamber, the cooling ring is provided with a water inlet and a water outlet connected thereto; the multiple water inlet pipes are connected to the multiple water inlets in a one-to-one correspondence; and the multiple water outlet pipes are connected to the multiple water outlets in a one-to-one correspondence. The present invention can achieve rapid adjustment of film thickness during blown film production, has a simple overall structure, is easy to install, is inexpensive, and can effectively improve product quality and reduce production losses.

Description

Technical Field

[0001] The present invention relates to the technical field of film blowing equipment, and in particular to a water-cooled film thickness control device. Background Art

[0002] In heavy-duty film blowing machines, the thickness of heavy packaging film is controlled by installing a cooling air ring at the die head. This cooling air ring is divided into multiple air outlet zones. By varying the air volume or air temperature within these zones, the temperature of each region of the film surface varies. High surface temperatures slow film formation and tend to thinner, while low surface temperatures promote faster film formation and thicker thickness. Because cooling air rings with localized film thickness adjustment are expensive, bulky, cumbersome to install, and complex to operate, some manufacturers choose cooling air rings without this feature. This results in poor product quality, high scrap, and the release of substandard products into the market, causing losses. Summary of the Invention

[0003] The purpose of the present invention is to provide a water-cooled film thickness control device, which can achieve rapid adjustment of film thickness during film blowing production, has a simple overall structure, is low in cost, can effectively improve product quality, and reduce production losses.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A water-cooled film thickness control device, comprising:

[0006] A cooling ring having a plurality of cooling cavities that are not interconnected, the plurality of cooling cavities being evenly distributed around the central axis of the cooling ring, and a water inlet and a water outlet communicating with each cooling cavity being provided on the cooling ring;

[0007] A plurality of water inlet pipes, wherein the plurality of water inlet pipes are connected to the plurality of water inlets in a one-to-one correspondence;

[0008] A plurality of water outlet pipes are connected to the plurality of water outlets in a one-to-one correspondence.

[0009] Furthermore, the cooling cavity is in an elongated shape and extends radially along the cooling ring.

[0010] Furthermore, a partition is provided in the cooling chamber, which divides the cooling chamber into a water inlet chamber and a water outlet chamber. The water inlet chamber is connected to the water inlet, and the water outlet chamber is connected to the water outlet. A water hole is provided on the partition to connect the water inlet chamber with the water outlet chamber.

[0011] Furthermore, the water inlet and the water outlet are arranged on both sides of the cooling ring in the thickness direction.

[0012] Furthermore, a plurality of partitions are provided, and the plurality of partitions are arranged in parallel and at intervals, a transition cavity is formed between two adjacent partitions, and the two outermost partitions and the cooling ring are arranged to form the water inlet cavity and the water outlet cavity.

[0013] Furthermore, the water inlet and the water outlet are coaxially arranged, and in the radial direction of the cooling ring, the water hole and the water inlet are spaced apart.

[0014] Furthermore, a plurality of water holes are provided, and the plurality of water holes are evenly distributed along the circumference of the cooling ring.

[0015] Furthermore, the cooling ring is made of heat-conducting material, and a heat-insulating layer is laid on the bottom.

[0016] Furthermore, a mounting component is provided at the bottom of the cooling ring, and the cooling ring is mounted above the die head through the mounting component.

[0017] Furthermore, the water inlet pipe is provided with a water inlet valve, and the water outlet pipe is provided with a water outlet valve.

[0018] The beneficial effects of the present invention are as follows: The water-cooled film thickness control device is installed above the die head of a film blowing machine, with the water inlet pipe connected to the water outlet pipe of a cooling tower, and the water outlet pipe connected to the return pipe of the cooling tower. When the film blowing machine is producing film, the film bubble is in direct contact with the cooling ring, and the coolant circulates within the cooling chamber through the water inlet and outlet pipes. When it is detected that the thickness of a single area on the film bubble needs to be changed, the flow rate of the coolant is controlled to achieve rapid adjustment of the film thickness. The present invention has a simple overall structure, is easy to install, is low-cost, and is applicable to most die heads, effectively improving product quality and reducing production losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a schematic structural diagram of a water-cooled film thickness control device according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the working process of the water-cooled film thickness control device according to an embodiment of the present invention;

[0021] Figure 3 is a top view of a water-cooled film thickness control device according to an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the distribution of the cooling cavity according to an embodiment of the present invention.

[0023] In the picture:

[0024] 1. Cooling ring;

[0025] 2. Cooling chamber; 21. Water inlet; 22. Water outlet; 23. Partition; 231. Water hole;

[0026] 3. Water inlet pipe;

[0027] 4. Water outlet pipe;

[0028] 100, die head; 200, film bubble. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0030] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, mechanical or electrical connections, direct or indirect connections through an intermediate medium, and internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0033] like Figures 1-4 As shown, a water-cooled film thickness control device includes a cooling ring 1, multiple cooling chambers 2, multiple water inlet pipes 3 and multiple water outlet pipes 4. Multiple cooling chambers 2 that are not connected to each other are arranged inside the cooling ring 1. The multiple cooling chambers 2 are evenly distributed around the central axis of the cooling ring 1. For each cooling chamber 2, the cooling ring 1 is provided with a water inlet 21 and a water outlet 22 that are connected thereto; the multiple water inlet pipes 3 are connected to the multiple water inlets 21 in a one-to-one correspondence; and the multiple water outlet pipes 4 are connected to the multiple water outlets 22 in a one-to-one correspondence.

[0034] In this embodiment, there are 48 cooling chambers 2, which are not connected to each other. Each cooling chamber 2 is independently provided with a water inlet pipe 3 and a water outlet pipe 4. Each water inlet pipe 3 is connected to the water outlet pipe of the cooling tower, and each water outlet pipe 4 is connected to the water inlet pipe of the cooling tower. The coolant circulates in the cooling chamber 2 through the water inlet pipe 3 and the water outlet pipe 4. The water-cooled film thickness control device of the present invention is installed above the die head 100 of the film blowing machine. When the film blowing machine is performing film blowing production, the film bubble 200 blown out by the die head 100 is in direct contact with the inner wall of the cooling ring 1. When it is detected that the thickness of a single area on the film bubble 200 in direct contact with the inner wall of the cooling ring 1 needs to be changed, the coolant flow rate in the cooling chamber 2 at the corresponding position in the cooling ring 1 can be controlled to achieve rapid adjustment of the film thickness. The water-cooled film thickness control device has a simple overall structure, is easy to install, and is low in cost. It is suitable for most die heads and can effectively control the thickness of the film bubble 200 during blown film production, thereby improving product quality, reducing production losses, and lowering production costs.

[0035] Specifically, the cooling cavity 2 is in the shape of an elongated strip and extends radially along the cooling ring 1. In this embodiment, the 48 cooling cavities 2 are distributed in the cooling ring 1 as follows: Figure 4 As shown, each cooling cavity 2 is independently arranged, and the cavity shape of the cooling cavity 2 is long and strip-shaped, approximately a rectangular parallelepiped. The length direction of the cooling cavity 2 is the same as the radial direction of the cooling ring 1, and the width direction of the cooling cavity 2 is tangent to the circumference of the inner wall of the cooling ring 1. The cooling cavity 2 is centrally symmetrically arranged in the cooling ring 1. The width design size of the cooling cavity 2 can be adjusted accordingly according to the circumference size of the inner wall of the cooling ring 1, so that the cumulative sum of the width sizes of multiple cooling cavities 2 is as close as possible to the circumference size of the inner wall of the cooling ring 1, leaving no cooling dead angle, and being able to cool any area of ​​the membrane bubble 200 in contact with the inner wall of the cooling ring 1.

[0036] More specifically, a baffle 23 is provided within the cooling chamber 2, dividing the cooling chamber 2 into an inlet chamber and an outlet chamber. The inlet chamber communicates with the water inlet 21, and the outlet chamber communicates with the water outlet 22. A water hole 231 is provided on the baffle 23 to connect the two chambers. In this embodiment, the horizontal baffle 23 divides the cooling chamber 2 into an inlet chamber and an outlet chamber symmetrically. The 48 cooling chambers 2 are divided into 48 independent inlet chambers and 48 independent outlet chambers. The baffle 23 is provided with a water hole 231. Coolant flows from the water inlet 21 into the inlet chamber through the water inlet pipe 3, flows into the outlet chamber through the water hole 231, and is discharged through the outlet pipe 4. The baffle 23 forms a fixed flow path for the coolant within the cooling chamber 2, ensuring a uniform coolant flow rate within the chamber. It also lengthens the coolant flow path and fully utilizes the coolant.

[0037] More specifically, the water inlet 21 and the water outlet 22 are located on both sides of the thickness direction of the cooling ring 1. In this embodiment, the membrane bubble 200 contacts the inner wall of the cooling ring 1. The water inlet 21 and the water outlet 22 are located on both sides of the thickness direction of the cooling ring 1 as close as possible to the outer diameter of the cooling ring 1 to prevent the installed water inlet pipe 3 and the water outlet pipe 4 from affecting the production of the membrane bubble 200.

[0038] More specifically, multiple baffles 23 are provided, arranged in parallel and spaced apart. A transition cavity is formed between two adjacent baffles 23. The two outermost baffles 23 and the cooling ring 1 enclose a water inlet cavity and a water outlet cavity. In this embodiment, multiple baffles 23 can be arranged in parallel within a cooling cavity 2. The multiple baffles 23 divide the cooling cavity 2 equally, and a transition cavity is formed between two adjacent baffles 23, further lengthening the coolant flow path and fully utilizing the coolant.

[0039] Specifically, the water inlet 21 and the water outlet 22 are coaxially arranged, and the water hole 231 is spaced apart from the water inlet in the radial direction of the cooling ring 1. In this embodiment, the water hole 231 is a rectangular through-hole. Alternatively, the water hole 231 can be a dot-shaped hole. The water hole 231 is located at one end of the partition 23 near the inner diameter of the cooling ring 1. The water inlet 21 and the water outlet 22 are coaxially arranged as close as possible to the outer diameter of the cooling ring 1, so that the coolant can flow to every corner of the cooling chamber 2, ensuring the cooling effect.

[0040] More specifically, a plurality of water holes 231 are provided, and the plurality of water holes 231 are evenly distributed along the circumference of the cooling ring 1. In this embodiment, a plurality of water holes 231 can be provided on a single baffle 23, and the plurality of water holes 231 are evenly distributed along the circumference of the cooling ring 1 on the baffle 23. The plurality of water holes 231 allow the coolant to flow quickly through both sides of the baffle 23, accelerating the flow of the coolant on both sides of the baffle 23 and enhancing the cooling effect of the cooling ring 1.

[0041] Optionally, the cooling ring 1 is made of a thermally conductive material and has a thermal insulation layer on its bottom. In this embodiment, the inner wall of the cooling ring 1 can be made of a thermally conductive material, which can quickly transfer heat and achieve a good cooling effect. Since the cooling ring 1 is installed above the film blowing machine die head 100, the heat generated by the die head 100 will affect the cooling effect of the cooling ring 1. Therefore, a thermal insulation layer is laid on the bottom of the cooling ring 1 to isolate the heat generated by the die head 100.

[0042] Optionally, a mounting component is provided at the bottom of the cooling ring 1 , and the cooling ring 1 is mounted above the die head 100 via the mounting component.

[0043] Optionally, the water inlet pipe 3 is provided with an inlet valve, and the water outlet pipe 4 is provided with an outlet valve. In this embodiment, each water inlet pipe 3 is provided with an inlet valve, and each water outlet pipe 4 is provided with an outlet valve, for a total of 48 inlet valves and 48 outlet valves. Each inlet valve and outlet valve is independently controlled. When the thickness of a single area of ​​the film bubble 200 in direct contact with the inner wall of the cooling ring 1 needs to be changed, the inlet valve and outlet valve of the corresponding area are adjusted to control the water flow rate, thereby achieving precise and rapid adjustment of the film thickness. The inlet valve and outlet valve can also be electrically controlled and remotely controlled.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A water-cooled film thickness control device, characterized in that: include: A cooling ring (1), wherein a plurality of cooling cavities (2) that are not connected to each other are provided inside the cooling ring (1), the plurality of cooling cavities (2) are evenly distributed around the central axis of the cooling ring (1), and for each cooling cavity (2), a water inlet (21) and a water outlet (22) that are connected thereto are provided on the cooling ring (1); A plurality of water inlet pipes (3), wherein the plurality of water inlet pipes (3) are connected to the plurality of water inlets (21) in a one-to-one correspondence; A plurality of water outlet pipes (4), wherein the plurality of water outlet pipes (4) are connected to the plurality of water outlets (22) in a one-to-one correspondence; The cooling cavity (2) is in the shape of an elongated strip and extends radially along the cooling ring (1); A partition (23) is provided in the cooling chamber (2), and the partition (23) divides the cooling chamber (2) into a water inlet chamber and a water outlet chamber, the water inlet chamber is communicated with the water inlet (21), and the water outlet chamber is communicated with the water outlet (22), and a water hole (231) is provided on the partition (23) to enable the water inlet chamber to communicate with the water outlet chamber; The cooling cavity (2) is in the shape of an elongated strip and extends radially along the cooling ring (1). The length direction of the cooling cavity (2) is the same as the radial direction of the cooling ring (1). The width direction of the cooling cavity (2) is tangential to the inner wall of the cooling ring (1). The cooling cavity (2) is centrally symmetrically arranged in the cooling ring (1).

2. The water-cooled film thickness control device according to claim 1, characterized in that: The water inlet (21) and the water outlet (22) are arranged on both sides of the cooling ring (1) in a thickness direction.

3. The water-cooled film thickness control device according to claim 2, characterized in that: A plurality of partitions (23) are provided, and the plurality of partitions (23) are arranged in parallel and at intervals, and a transition cavity is formed between two adjacent partitions (23). The two outermost partitions (23) and the cooling ring (1) are arranged to form the water inlet cavity and the water outlet cavity.

4. The water-cooled film thickness control device according to claim 1, characterized in that: The water inlet (21) and the water outlet (22) are coaxially arranged, and in the radial direction of the cooling ring (1), the water hole (231) and the water inlet are spaced apart.

5. The water-cooled film thickness control device according to claim 4, characterized in that: A plurality of water holes (231) are provided, and the plurality of water holes (231) are evenly distributed along the circumference of the cooling ring (1).

6. The water-cooled film thickness control device according to any one of claims 1 to 5, characterized in that: The cooling ring (1) is made of heat-conducting material, and a heat-insulating layer is laid on the bottom.

7. The water-cooled film thickness control device according to any one of claims 1 to 5, characterized in that: The bottom of the cooling ring (1) is provided with a mounting component, and the cooling ring (1) is mounted above the die head (100) via the mounting component.

8. The water-cooled film thickness control device according to any one of claims 1 to 5, characterized in that: The water inlet pipe (3) is provided with a water inlet valve, and the water outlet pipe (4) is provided with a water outlet valve.

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