Hot air circulation structure of container liquid bag film blowing machine

Abstract

The utility model provides a hot air circulation structure of a container liquid bag film blowing machine, which belongs to the technical field of liquid bag film blowing machines and comprises a heater, a heating element is arranged in the heater, an outlet of the heater is connected with one end of an air inlet pipeline, and the other end of the air inlet pipeline is connected with an air outlet of the container liquid bag film blowing machine. The other end of the air inlet pipeline is connected with the hot air distributor, an adjustable air opening and an expansion plate are arranged on the wide opening portion of the hot air distributor, an inlet of the heater is connected with one end of the air return pipeline, the other end of the air return pipeline is connected with the lower portion of the die head, and a film outlet is formed in the die head. An outlet of the air inlet pipeline is formed in the inner side of the film outlet, a temperature sensor is arranged at the wide opening part of the hot air distributor and used for monitoring the temperature of hot air, the defect that hot air distribution of a traditional hot air circulation structure is not uniform is overcome, and hot air distribution is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid bag film blowing machine technical field, concretely relates to a hot air circulation structure of container liquid bag film blowing machine. BACKGROUND

[0002] Liquid bag film blowing machine is a kind of equipment for producing film plastic packaging bag, and its core part is hot air circulation system. The main function of hot air circulation system is to provide stable hot air to ensure that plastic film is uniformly heated in the forming process, so as to obtain high-quality film product. The hot air circulation structure of liquid bag film blowing machine usually includes the following several key components: heater is the core component of hot air circulation system, is responsible for heating cold air to the required temperature. Common heater types include resistance heating, electromagnetic heating and infrared heating. The air inlet pipe transports the hot air generated by the heater to the hot air distributor. The hot air distributor is located above the die, responsible for uniformly distributing hot air around the die. The design of hot air distributor greatly influences the quality of film forming. The die is the key component of liquid bag film blowing machine, responsible for extruding molten plastic into film. The air return pipe guides the hot air around the die back to the heater, forming a closed-loop hot air circulation system. The design of air return pipe needs to consider the smoothness of air flow and heat exchange efficiency, and common designs include straight pipe, elbow and spiral guide vane, etc.

[0003] The hot air distributor with publication number CN103776251B (application number CN201210395056.2) includes a volute with an air inlet and a hollow inner cavity, a wind guide device installed in the volute inner cavity, which includes a circular first bottom plate and a circular second bottom plate arranged in parallel, a first and second cone sleeve are provided at the center holes of the first and second bottom plates, thereby forming an air outlet between the first and second cone sleeves, wherein a plurality of arc-shaped guide plates are arranged between the first and second bottom plates. According to the hot air distributor of the present application, the air loss at the tail is small, and the hot air can be uniformly and straightly distributed.

[0004] There are still some deficiencies in its hot air circulation structure, which affect the quality and production efficiency of film forming: the traditional hot air distributor design often cannot ensure the uniform distribution of hot air around the die. Uneven distribution of hot air will cause local overheating or overcooling during film forming, which will affect the thickness uniformity and mechanical properties of the film. Many traditional liquid bag film blowing machines lack effective flow regulation mechanism, and cannot adjust the hot air flow according to different film thickness and material. This limits the flexibility and application range of the equipment, and it is difficult to meet the diversified product demand. The traditional air return pipe design is often simple, lacking effective heat exchange and cooling mechanism. This leads to large energy loss of hot air in the circulation process, increases energy consumption and reduces production efficiency. Utility Model Content

[0005] In view of this, the utility model provides a hot air circulation structure of a container liquid bag film blowing machine, which solves the disadvantage of uneven hot air distribution in traditional hot air circulation structures and makes the hot air distribution more uniform.

[0006] The utility model is achieved in this way:

[0007] The utility model provides a hot air circulation structure of a container liquid bag film blowing machine, which includes a heater, a heating element is arranged inside the heater, the outlet of the heater is connected to one end of an air inlet duct, the other end of the air inlet duct is connected to a hot air distributor, the wide-mouth part of the hot air distributor is provided with an adjustable air outlet and an expansion plate, the inlet of the heater is connected to one end of a return air duct, the other end of the return air duct is connected to the bottom of a die head, a film outlet is provided on the die head, and the outlet of the air inlet duct is provided on the inner side of the film outlet.

[0008] The wide mouth portion of the hot air distributor is provided with a temperature sensor, which is used to monitor the temperature of the hot air with an accuracy of ±1°C.

[0009] The heater is specifically a resistance heater.

[0010] On the basis of the above technical solution, the hot air circulation structure of the container liquid bag film blowing machine of the utility model can also be improved as follows:

[0011] The heating elements inside the heater are arranged in a spiral shape, the spiral pitch is 1 / 20 to 1 / 10 of the diameter of the heater, and the spiral length is 6 to 9 times the diameter of the heater.

[0012] The spiral pitch of the spiral is 5 mm to 10 mm, and the spiral length is 200 mm to 300 mm.

[0013] Furthermore, the air inlet duct is in a straight cylindrical shape, the diameter of the straight cylindrical shape is 1 / 4 to 1 / 3 of the diameter of the die head, and the length is 2 to 3 times the height of the die head.

[0014] The diameter of the straight cylinder is 50mm to 100mm, and the length is 1000mm to 1500mm.

[0015] Furthermore, the wide mouth portion of the hot air distributor is trumpet-shaped, the trumpet mouth diameter is 1 to 1.5 times the diameter of the die head, and the height is 1 / 3 to 1 / 2 of the diameter of the die head.

[0016] The diameter of the trumpet-shaped bell mouth is 200mm to 300mm, and the height is 100mm to 150mm.

[0017] Further, the adjustable air inlet comprises an adjusting plate and a hinge, the adjusting plate is connected with the wide mouth part of the hot air distributor through the hinge, the length of the adjusting plate is 1 / 2 to 2 / 3 of the diameter of the wide mouth part of the hot air distributor, and the width of the adjusting plate is 1 / 4 to 1 / 3 of the diameter of the wide mouth part of the hot air distributor.

[0018] The extension plate is fixed on the wide mouth part of the hot air distributor and located in front of the adjusting plate. The honeycomb structure of the extension plate covers most of the area of the wide mouth part of the hot air distributor, ensuring that the hot air can be uniformly distributed before entering the die head. The adjusting plate and the extension plate maintain a certain distance, usually 10mm to 50mm. The length of the adjusting plate is 100mm to 150mm, and the width is 50mm to 100mm.

[0019] Further, the extension plate is honeycomb-shaped, the honeycomb-shaped is composed of a plurality of hexagonal holes, the aperture of the hexagonal hole is 1 / 40 to 1 / 20 of the diameter of the wide mouth part of the hot air distributor, the hole spacing is 2 to 3 times the aperture, and the thickness is 1 / 10 to 1 / 5 of the height of the wide mouth part of the hot air distributor.

[0020] The aperture of the hexagonal hole is 5mm to 10mm, the hole spacing is 10mm to 20mm, and the thickness is 10mm to 20mm.

[0021] Further, the return air pipe is a curved pipe, the diameter of the curved pipe is 1 to 1.5 times the diameter of the air inlet pipe, the length is 2 to 3 times the height of the die head, and the bend radius is 2 to 3 times the diameter of the air inlet pipe.

[0022] The diameter of the curved pipe is 50mm to 100mm, the length is 1000mm to 1500mm, and the bend radius is 100mm to 200mm.

[0023] Further, the die head is cylindrical, the diameter of the cylindrical is 2 to 3 times the diameter of the film outlet, the height is 3 to 5 times the diameter of the film outlet, and the diameter of the film outlet is 1 / 3 to 1 / 2 of the diameter of the die head.

[0024] The diameter of the cylindrical is 200mm to 300mm, the height is 300mm to 500mm, and the diameter of the film outlet (9) is 100mm to 200mm.

[0025] Further, the adjusting range of the adjusting plate is 0° to 45°.

[0026] Further, the heater, air inlet pipe, hot air distributor, return air pipe and die head are made of stainless steel or plastic.

[0027] Specifically, the heater, air inlet pipe, hot air distributor, return air pipe and die head are made of high-temperature-resistant stainless steel or heat-resistant plastic.

[0028] Compared with the prior art, the hot air circulation structure of the container liquid bag film blowing machine has the following beneficial effects:

[0029] The hot air distribution is more uniform: the hot air distributor of the utility model adopts the design of honeycomb diffusion plate, the honeycomb diffusion plate is composed of a plurality of hexagonal holes, the hole diameter and the hole spacing are optimized and designed, and the uniformity of the distribution of hot air around the die is ensured to be more than 95%. This significantly improves the quality of film forming, reduces the phenomenon of local overheating or overcooling, and improves the thickness uniformity and mechanical properties of the film;

[0030] The hot air flow is adjustable: the wide mouth part of the hot air distributor is provided with an adjustable air port, and the adjusting plate is connected with the hot air distributor through a hinge, and the adjusting range is 0° to 45°. The operator can adjust the angle of the adjusting plate by manual or mechanical method, so as to accurately control the flow and distribution of hot air. This makes the equipment be able to flexibly cope with the film production requirements of different thickness and material, and improves the application range and production efficiency of the equipment;

[0031] High heat exchange efficiency: the return air duct is provided with spiral guide vanes inside, the spiral spacing and length of the guide vanes are optimized and designed, the air is guided to form a spiral flow, the heat exchange efficiency is improved, and the energy loss is reduced. In addition, the return air duct adopts multi-section splicing design, each section of the duct is short, which is convenient for cleaning and maintenance, reduces the risk of pipe blockage, and improves the reliability and service life of the equipment;

[0032] Convenient maintenance: the flanges or welding methods are used to connect the various components of the utility model, the connection method is flexible, and the equipment is convenient for disassembly and maintenance. For example, a filter screen is arranged between the inlet of the heater and the outlet of the return air duct, the mesh number of the filter screen is optimized and designed, impurities can be effectively filtered, and the risk of clogging of the heater is reduced. In addition, the wide mouth part of the hot air distributor and the film outlet of the die are kept at a certain distance, which is convenient for cleaning and inspection. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the utility model. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor intensity.

[0034] Fig. 1 It is a front view of the hot air circulation structure of the container liquid bag film blowing machine;

[0035] Fig. 2 It is a rear view of the hot air circulation structure of the container liquid bag film blowing machine;

[0036] Fig. 3 A bottom view of a hot air distributor of a hot air circulation structure of a container liquid bag film blowing machine;

[0037] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0038] 10. Heater; 20. Air inlet duct; 30. Hot air distributor; 311. Adjustment plate; 32. Expansion plate; 40. Return air duct; 50. Die head; 51. Film outlet. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0040] like Figs. 1-3 As shown, it is a first embodiment of the hot air circulation structure of a container liquid bag film blowing machine provided by the utility model. In this embodiment, it includes a heater 10, a heating element is arranged inside the heater 10, the outlet of the heater 10 is connected to one end of the air inlet duct 20, the other end of the air inlet duct 20 is connected to the hot air distributor 30, the wide mouth part of the hot air distributor 30 is provided with an adjustable air outlet and an expansion plate 32, the inlet of the heater 10 is connected to one end of the return air duct 40, the other end of the return air duct 40 is connected to the bottom of the die head 50, the die head 50 is provided with a film outlet 51, and the inner side of the film outlet 51 is provided with the outlet of the air inlet duct 20.

[0041] The heater's outlet is connected to one end of the air inlet duct via a flange. The flange is equipped with multiple bolt holes, and bolts and nuts secure the two together. The heater is located at the front end of the entire hot air circulation structure, and the air inlet duct extends from the heater's outlet.

[0042] The other end of the air inlet duct is connected to the narrow portion of the hot air distributor via welding or a flange. If a flange is used, the two are fastened together using bolts and nuts. The air inlet duct extends in a straight line and ultimately connects to the narrow portion of the hot air distributor.

[0043] The wide opening of the hot air distributor is directly aligned with the film outlet of the die, maintaining a certain distance between the two, usually 1 / 2 to 1 times the diameter of the die. The hot air distributor is located above the die to ensure that the hot air can evenly cover the film outlet of the die.

[0044] One end of the return air duct is connected to the air outlet below the die head through a flange or welding. The return air duct extends from the air outlet below the die head, bends downward, and is connected to the inlet of the heater.

[0045] The other end of the return air pipe is connected with the inlet of the heater through a flange. The flange is provided with a plurality of bolt holes, and the two are fastened together through bolts and nuts. The return air pipe extends from the air outlet below the die head and is finally connected to the inlet of the heater, forming a closed-loop hot air circulation structure.

[0046] In the above technical solution, the heating element inside the heater 10 is arranged in a spiral shape, the spiral pitch is 1 / 20 to 1 / 10 of the diameter of the heater 10, and the spiral length is 6 to 9 times the diameter of the heater.

[0047] Specifically, the heating element includes a resistance heating element or an electromagnetic heating element. The resistance heating element is usually made of high-temperature-resistant nichrome wire, and the electromagnetic heating element is usually composed of a ferrite core and a copper coil wound thereon. One end of the resistance heating element is connected to the heater shell through a flange. The flange is provided with a plurality of bolt holes, and the heating element is fixed in the heater shell through bolts and nuts. One end of the copper coil of the electromagnetic heating element can be connected to the power connector through a binding method. The binding point should be firm and insulating.

[0048] Further, in the above technical solution, the air inlet pipe 20 is a straight cylinder, the diameter of the straight cylinder is 1 / 4 to 1 / 3 of the diameter of the die head 50, and the length is 2 to 3 times the height of the die head 50.

[0049] Further, in the above technical solution, the wide mouth part of the hot air distributor 30 is in a trumpet shape, the trumpet mouth diameter of the trumpet shape is 1 to 1.5 times the diameter of the die head 50, and the height is 1 / 3 to 1 / 2 of the diameter of the die head 50.

[0050] Further, in the above technical solution, the adjustable air inlet includes an adjusting plate 311 and a hinge. The adjusting plate 311 is connected to the wide mouth part of the hot air distributor 30 through the hinge. The length of the adjusting plate 311 is 1 / 2 to 2 / 3 of the wide mouth diameter of the hot air distributor 30, and the width is 1 / 4 to 1 / 3 of the wide mouth diameter of the hot air distributor 30.

[0051] Further, in the above technical solution, the expansion plate 32 is in a honeycomb shape, which is composed of a plurality of hexagonal holes. The hole diameter of the hexagonal hole is 1 / 40 to 1 / 20 of the wide mouth diameter of the hot air distributor 30, the hole spacing is 2 to 3 times the hole diameter, and the thickness is 1 / 10 to 1 / 5 of the wide mouth height of the hot air distributor 30.

[0052] Further, in the above technical solution, the return air pipe 40 is a curved pipe, the diameter of the curved pipe is 1 to 1.5 times the diameter of the air inlet pipe 20, the length is 2 to 3 times the height of the die head 50, and the bend radius is 2 to 3 times the diameter of the air inlet pipe 20.

[0053] Further, in the above technical solution, the die head 50 is cylindrical, the diameter of the cylindrical shape is 2 to 3 times the diameter of the film outlet 51, the height is 3 to 5 times the diameter of the film outlet 51, and the diameter of the film outlet 51 is 1 / 3 to 1 / 2 of the diameter of the die head 50.

[0054] Further, in the above technical solution, the adjustment range of the adjustment plate 311 is 0° to 45°.

[0055] Further, in the above technical solution, the heater 10, the air inlet pipe 20, the hot air distributor 30, the air return pipe 40 and the die head 50 are all made of stainless steel or plastic.

[0056] Specifically, the principle of the utility model is:

[0057] The design of the honeycomb-shaped diffusion plate of the hot air distributor:

[0058] The design of the honeycomb-shaped diffusion plate is based on the principles of fluid mechanics and heat transfer, and by optimizing the hole diameter and hole spacing, the uniformity of the distribution of hot air around the die head is ensured to be more than 95%. The specific principle is as follows:

[0059] Fluid mechanics principle: the hexagonal hole design of the honeycomb-shaped diffusion plate makes the hot air form multiple tiny air flow channels when passing through the pores, and these air flow channels are independent and uniformly distributed, reducing turbulence and local overheating. The hole diameter and hole spacing are calculated to ensure uniform velocity and pressure distribution of the airflow when passing through the pores;

[0060] Heat transfer principle: the thickness and material selection of the honeycomb-shaped diffusion plate are also optimized to maximize the heat transfer efficiency of the hot air when passing through the pores. The improvement of heat transfer efficiency not only reduces the energy loss of hot air, but also improves the uniformity and quality of film forming;

[0061] Design of adjustable air port:

[0062] The design of the adjustable air port is based on the principles of fluid mechanics and mechanical engineering, and by adjusting the rotation angle of the adjustment plate, the flow and distribution of hot air are accurately controlled. The specific principle is as follows:

[0063] Fluid mechanics principle: the rotation angle of the adjustment plate changes the flow area of the hot air, thereby affecting the flow rate and flow of the hot air. When the adjustment plate is at 0°, the flow area of the hot air is the largest, and the air volume is the largest; when the adjustment plate is at 45°, the flow area of the hot air is the smallest, and the air volume is the smallest. By adjusting the angle of the adjustment plate, the flow and distribution of hot air can be flexibly controlled to meet different film production needs;

[0064] Mechanical Engineering Principle: The adjustment plate is connected to the hot air distributor through a hinge, which is designed to allow the adjustment plate to rotate freely within a range of 0° to 45°. The adjustment plate has stops at both ends to limit its maximum rotation angle to 45° and its minimum angle to 0°, ensuring that the adjustment plate does not over-rotate. During manual adjustment, the operator can adjust the angle of the adjustment plate using a handle or knob; during mechanical adjustment, an electric or pneumatic actuator can be used to drive the rotation of the adjustment plate.

Claims

1. A hot air circulation structure of a container liquid bag film blowing machine, characterized by, The application relates to a heating device for a film blowing machine, which comprises a heater (10) internally provided with a heating element, an outlet of the heater (10) being connected with one end of an air inlet pipe (20), the other end of the air inlet pipe (20) being connected with a hot air distributor (30), a wide mouth portion of the hot air distributor (30) being provided with an adjustable air outlet and an expansion plate (32), an inlet of the heater (10) being connected with one end of an air return pipe (40), the other end of the air return pipe (40) being connected with the lower portion of a die head (50), the die head (50) being provided with a film outlet (51) on the upper portion, and the inner side of the film outlet (51) being provided with the outlet of the air inlet pipe (20).

2. The hot air circulation structure of a container liquid bag film blowing machine according to claim 1, characterized in that, The heating element in the heater (10) is arranged in a spiral shape, the spiral interval is 1 / 20 to 1 / 10 of the diameter of the heater (10), and the spiral length is 6 to 9 times the diameter of the heater.

3. The hot air circulation structure of a container liquid bag film blowing machine according to claim 2, characterized in that, The air inlet pipe (20) is a straight cylinder, the diameter of the straight cylinder is 1 / 4 to 1 / 3 of the diameter of the die head (50), and the length is 2 to 3 times the height of the die head (50).

4. The hot air circulation structure of a container liquid bag film blowing machine according to claim 3, characterized in that, The wide mouth portion of the hot air distributor (30) is in a horn shape, the horn mouth diameter of the horn shape is 1 to 1.5 times the diameter of the die head (50), and the height is 1 / 3 to 1 / 2 of the diameter of the die head (50).

5. The hot air circulation structure of a container liquid bag film blowing machine according to claim 4, characterized in that, The adjustable air outlet comprises an adjusting plate (311) and a hinge, the adjusting plate (311) is connected with the wide mouth portion of the hot air distributor (30) through the hinge, the length of the adjusting plate (311) is 1 / 2 to 2 / 3 of the diameter of the wide mouth of the hot air distributor (30), and the width is 1 / 4 to 1 / 3 of the diameter of the wide mouth of the hot air distributor (30).

6. The hot air circulation structure of a container liquid bag film blowing machine according to claim 5, wherein The expansion plate (32) is in a honeycomb shape, the honeycomb shape is composed of a plurality of hexagonal holes, the hole diameter of the hexagonal hole is 1 / 40 to 1 / 20 of the diameter of the wide mouth of the hot air distributor (30), the hole interval is 2 to 3 times the hole diameter, and the thickness is 1 / 10 to 1 / 5 of the height of the wide mouth of the hot air distributor (30).

7. The hot air circulation structure of a container liquid bag film blowing machine according to claim 6, characterized in that, The air return pipe (40) is a curved pipe, the diameter of the curved pipe is 1 to 1.5 times the diameter of the air inlet pipe (20), the length is 2 to 3 times the height of the die head (50), and the bend radius is 2 to 3 times the diameter of the air inlet pipe (20).

8. The hot air circulation structure of a container liquid bag film blowing machine according to claim 7, characterized in that, The die head (50) is in a cylindrical shape, the diameter of the cylindrical shape is 2 to 3 times the diameter of the film outlet (51), the height is 3 to 5 times the diameter of the film outlet (51), and the diameter of the film outlet (51) is 1 / 3 to 1 / 2 of the diameter of the die head (50).

9. The hot air circulation structure of a container liquid bag film blowing machine according to claim 8, characterized in that, The adjusting range of the adjusting plate (311) is 0 to 45 degrees.

10. The hot air circulation structure of a container liquid bag film blowing machine according to claim 9, wherein The heater (10), the air inlet pipe (20), the hot air distributor (30), the air return pipe (40) and the die head (50) are all made of stainless steel or plastic.

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