Double-air-opening air ring of film blowing machine

Abstract

The invention provides a double-air-opening air ring of a film blowing machine. The double-air-opening air ring comprises a base plate, a lower air uniformizing ring, an inner air outlet ring, a ventilation ring, an upper air uniformizing ring, an outer air outlet ring and an upper air blocking ring assembly. The upper end face of the lower air uniformizing ring is provided with flow guide pieces which are evenly distributed at intervals in the circumferential direction, air circulation passages are formed between the flow guide pieces, and the upper portions make contact with the upper air uniformizing ring. The flow guide piece forms a V-shaped air inlet and outlet passage through symmetrically-distributed conical bodies, and the airflow uniformity is enhanced. The guide block is inserted into the positioning ring groove of the upper air uniformizing ring to ensure the stability of the flow guide piece. The design effectively guides airflow, reduces turbulent flow, and improves the film bubble cooling effect and the film quality.

Description

Technical Field

[0001] The invention particularly relates to a double-air outlet air ring of a film blowing machine. Background Art

[0002] In the film blowing machine, the air ring is one of the key components. Its main function is to cool the film bubble extruded from the die head and blown into shape. The cooling airflow of the air ring is a 360-degree annular airflow, which blows towards the film bubble to cool it. Whether the air outlet of the air ring is stable and uniform directly affects the stretching of the film bubble and the quality of the film.

[0003] For example, the document with the publication number "CN217597804U" discloses a set of double-air-inlet air rings for a film blowing machine, which are mainly composed of a chassis, an air-distributing member, a first ring body, and a second ring body. Circular air-distributing holes are provided on the upper and lower air-distributing rings to achieve gas circulation. However, in actual applications, when the airflow passes through the circular air-distributing holes, local turbulence or unevenness still occurs, resulting in uneven cooling of the film bubble. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a double air outlet air ring for a film blowing machine in view of the above-mentioned deficiencies in the prior art. Through the guidance of the guide member, the airflow is smoother when passing through the gas flow channel, avoiding the problem of local airflow being too strong or too weak, thereby improving the cooling effect of the film bubble and the quality of the film.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a double-air-inlet air ring of a film blowing machine, comprising a chassis and a lower air-uniform ring which is sealed and connected to the outer edge of the chassis, an inner air outlet ring is arranged above the chassis, a ventilation ring is sealed and connected to the outer edge of the lower air-uniform ring, an upper air-uniform ring is sealed and connected to the inner edge of the ventilation ring, the upper air-uniform ring is distributed above the lower air-uniform ring and there is an air inlet gap between the two, a plurality of groups of air inlet tubes are evenly distributed on the outer periphery of the ventilation ring, an outgoing air ring is arranged above the inner air outlet ring, a first air outlet gap is provided between the outgoing air ring and the inner air outlet ring, a second air outlet gap is provided between the chassis and the inner air outlet ring, a plurality of groups of ventilation holes are arranged on the outer edge of the inner air outlet ring, an upper air shielding ring assembly is arranged between the outer edge of the outgoing air ring and the inner edge of the upper air-uniform ring, and the characteristic is that a plurality of groups of flow guides which are evenly spaced and arranged along the circumferential direction are arranged on the upper end surface of the lower air-uniform ring, a gas flow passage is provided between each two adjacent groups of flow guides, and the upper part of the flow guide is in contact with the lower end surface of the upper air-uniform ring.

[0006] The design of the guide effectively guides the airflow, reduces turbulence, and makes the airflow more stable and evenly distributed. Through the guidance of the guide, the airflow is smoother when passing through the gas flow channel, avoiding the problem of excessive or weak local airflow, thereby improving the cooling effect of the film bubble and the quality of the film.

[0007] The present application can be further configured as follows: the guide member includes two groups of first cones and second cones that are symmetrically distributed and both are conical, the large end of the first cone is connected to the large end of the second cone, a V-shaped air inlet passage is formed between each two adjacent groups of first cones, and a V-shaped air outlet passage is formed between each two adjacent groups of second cones, the V-shaped air inlet passage and the V-shaped air outlet passage are interconnected and together constitute a gas flow passage.

[0008] The V-shaped air inlet and outlet make the airflow more uniform when entering and exiting, reducing the turbulence and unevenness of the airflow. This structure not only improves the uniformity of the airflow, but also enhances the cooling effect of the air ring.

[0009] The present application can be further configured as follows: the guide member also includes a guide block, the guide block is distributed between the first cone and the second cone and is located above the first cone and the second cone, the lower end surface of the upper air uniforming ring is provided with a positioning ring groove corresponding to the guide block, and several groups of guide blocks are inserted into the positioning ring groove.

[0010] Through the cooperation of the guide block and the positioning ring groove, the lower air uniforming ring remains stable during the installation and positioning process, avoiding the problem of uneven air flow caused by the position offset of the lower air uniforming ring, and further improving the cooling effect of the air ring and the film quality.

[0011] The present application can be further configured as follows: a limiting mechanism is arranged between the upper air uniforming ring and the ventilation ring, the limiting mechanism includes a limiting block, one end of the limiting block is pressed above the inner edge of the ventilation ring, the other end of the limiting block is detachably connected with a threaded connector, and the lower end of the threaded connector is detachably connected to the outer edge of the upper air uniforming ring.

[0012] Through the cooperation of the limit block and the threaded connector, the positional relationship between the upper air uniforming ring and the ventilation ring is more secure, avoiding the problem of uneven airflow caused by position offset, and further improving the cooling effect of the air ring and the film quality.

[0013] The present application can be further configured as follows: the upper wind shield ring assembly includes a first wind shield ring and a second wind shield ring, the outer edge of the first wind shield ring is sealed to the inner edge of the upper wind uniforming ring, the inner edge of the first wind shield ring is sealed to the outer edge of the second wind shield ring, and the inner edge of the second wind shield ring is sealed to the outer edge of the outgoing wind ring.

[0014] The first wind shield ring and the second wind shield ring cooperate with each other to enhance the overall structural strength of the wind ring, making it more stable when high-speed air flows through. By enhancing the structural strength, the wind ring can maintain good performance in long-term use and reduce the problem of uneven airflow caused by structural deformation.

[0015] The present application can be further configured as follows: a support ring is provided between the second wind shield ring and the outgoing wind ring, a mounting flange ring is provided above the second wind shield ring and close to the outer edge of the second wind shield ring, the outer circumferential surface of the support ring is sealedly connected to the inner circumferential surface of the mounting flange ring, and there is a deformable gap between the outer circumferential surface of the outgoing wind ring and the inner circumferential surface of the support ring.

[0016] Through the sealed connection between the support ring and the mounting flange ring, the airflow is more uniform when passing through the air ring, avoiding the problem of excessive or weak local airflow. The design of the deformation gap allows the outgoing air ring to deform slightly within a certain range, while the support ring protects the outgoing air ring to avoid excessive deformation of the outgoing air ring.

[0017] The present application may be further configured as follows: the outer peripheries of the first wind shield ring, the second wind shield ring and the outgoing wind ring are respectively connected with pillars protruding outwards.

[0018] The main function of the support is to facilitate the clamping of the first wind shield ring, the second wind shield ring and the outgoing wind ring during the installation process.

[0019] The beneficial effects of the present invention are as follows: by arranging the guide member, guide block, limit mechanism, upper wind shield ring assembly, support ring, mounting flange ring and support pillars on the wind uniformity member, the problems of uneven air flow distribution and complex structure in the prior art are effectively solved. This not only improves the cooling effect of the film bubble and the film quality, but also simplifies the structure of the wind ring and reduces the cost.

[0020] The present invention is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 A schematic top view of an embodiment of the present invention; Figure 3 is a cross-sectional schematic diagram of an embodiment of the present invention; Figure 4 for Figure 3 A partial enlarged schematic diagram of point B in the middle; Figure 5 for Figure 3 A partial enlarged schematic diagram in the middle; Figure 6 Schematic diagram of an inner air outlet ring according to an embodiment of the present invention; Figure 7 Schematic diagram of the lower uniform air ring of an embodiment of the present invention; Figure 8 for Figure 7 A partial enlarged schematic diagram of point C in the middle. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figures 1 to 8 The double air outlet air ring of the film blowing machine shown in the figure comprises a chassis 1 and a lower air uniforming ring 2 which is sealed and connected to the outer edge of the chassis 1, an inner air outlet ring 4 is arranged above the chassis 1, a ventilation ring 5 is sealed and connected to the outer edge of the lower air uniforming ring 2, an upper air uniforming ring 6 is sealed and connected to the inner edge of the ventilation ring 5, the upper air uniforming ring 6 is distributed above the lower air uniforming ring 2 and an air inlet gap 7 is provided between the two, a plurality of groups of air inlet tubes 5a are uniformly distributed on the outer periphery of the ventilation ring 5, an outgoing air ring 8 is arranged above the inner air outlet ring 4, and the outgoing air ring 8 is connected to the inner outlet ring 4. There is a first air outlet gap 9 between the air rings 4, a second air outlet gap 10 between the chassis 1 and the inner air outlet ring 4, a plurality of groups of ventilation holes 4a are provided at the outer edge of the inner air outlet ring 4, an upper wind shielding ring assembly is provided between the outer edge of the outer air ring 8 and the inner edge of the upper uniform air ring 6, and a plurality of groups of flow guides 2a evenly spaced along the circumferential direction are provided on the upper end face of the lower uniform air ring 2, a gas flow passage is provided between each two adjacent groups of flow guides 2a, and the upper part of the flow guide 2a is in contact with the lower end face of the upper uniform air ring 6. The design of the flow guide 2a effectively guides the airflow, reduces turbulence, and makes the airflow more stable and evenly distributed. Through the guidance of the flow guide 2a, the airflow is smoother when passing through the gas flow passage, avoiding the problem of excessive or weak local airflow, thereby improving the cooling effect of the film bubble and the quality of the film.

[0024] The guide member 2a includes two groups of first cones 2b and second cones 2c that are symmetrically distributed and both have a conical shape. The large end of the first cone 2b is connected to the large end of the second cone 2c. A V-shaped air inlet passage 2d is formed between each two adjacent groups of first cones 2b, and a V-shaped air outlet passage 2e is formed between each two adjacent groups of second cones 2c. The V-shaped air inlet passage 2d and the V-shaped air outlet passage 2e are interconnected and together form a gas flow passage. The arrangement of the V-shaped air inlet passage 2d and the V-shaped air outlet passage 2e makes the airflow more uniform when entering and flowing out, reducing the turbulence and unevenness of the airflow. This structure not only improves the uniformity of the airflow, but also enhances the cooling effect of the air ring.

[0025] The guide member 2a also includes a guide block 2f, which is distributed between the first cone 2b and the second cone 2c and is located above the first cone 2b and the second cone 2c. The lower end surface of the upper air leveling ring 6 is provided with a positioning ring groove 6a corresponding to the guide block 2f, and several groups of guide blocks 2f are inserted into the positioning ring groove 6a. Through the cooperation of the guide block 2f and the positioning ring groove 6a, the lower air leveling ring 2 remains stable during the installation and positioning process between the guide block 2f and the positioning ring groove 6a, avoiding the problem of uneven airflow caused by the position offset of the lower air leveling ring 2, and further improving the cooling effect of the air ring and the film quality.

[0026] A limiting mechanism is provided between the upper air leveling ring 6 and the ventilation ring 5, and the limiting mechanism includes a limiting block 11, one end of the limiting block 11 is pressed above the inner edge of the ventilation ring 5, and the other end of the limiting block 11 is detachably connected with a threaded connector, and the lower end of the threaded connector is detachably connected to the outer edge of the upper air leveling ring 6. Through the cooperation of the limiting block 11 and the threaded connector, the positional relationship between the upper air leveling ring 6 and the ventilation ring 5 is more secure, avoiding the problem of uneven airflow caused by position offset, and further improving the cooling effect of the air ring and the film quality.

[0027] The upper wind shield ring assembly includes a first wind shield ring 12 and a second wind shield ring 13. The outer edge of the first wind shield ring 12 is sealed to the inner edge of the upper wind uniforming ring 6, the inner edge of the first wind shield ring 12 is sealed to the outer edge of the second wind shield ring 13, and the inner edge of the second wind shield ring 13 is sealed to the outer edge of the outgoing wind ring 8. The first wind shield ring 12 and the second wind shield ring 13 cooperate with each other to enhance the overall structural strength of the wind ring, making it more stable when high-speed airflow passes through. By enhancing the structural strength, the wind ring can maintain good performance in long-term use, reducing the problem of uneven airflow caused by structural deformation.

[0028] A support ring 14 is provided between the second wind shield ring 13 and the outgoing wind ring 8, and a mounting flange ring 13a is provided above the second wind shield ring 13 and near the outer edge of the second wind shield ring 13. The outer peripheral surface of the support ring 14 is sealedly connected to the inner peripheral surface of the mounting flange ring 13a, and there is a deformation gap 15 between the outer peripheral surface of the outgoing wind ring 8 and the inner peripheral surface of the support ring 14. Through the sealed connection between the support ring 14 and the mounting flange ring 13a, the airflow is more uniform when passing through the air ring, avoiding the problem of excessive or weak local airflow. The design of the deformation gap 15 allows the outgoing wind ring 8 to be slightly deformed within a certain range, and at the same time, the support ring 14 protects the outgoing wind ring 8 to avoid excessive deformation of the outgoing wind ring 8.

[0029] The outer peripheries of the first wind shield ring 12, the second wind shield ring 13 and the outgoing wind ring 8 are respectively connected with pillars 16 protruding toward the outside, so as to facilitate the clamping of the first wind shield ring 12, the second wind shield ring 13 and the outgoing wind ring 8 during the installation process.

[0030] The airflow principle of this embodiment is as follows: several groups of air inlet ducts 5a take in air at the same time, the airflow passes through several groups of flow guide members 2a (between the upper uniform air ring 6 and the lower uniform air ring 2), flows under the first wind shield ring 12 and the second wind shield ring 13, a part of the air flows into the first air outlet gap 9 between the outer air ring 8 and the inner air outlet ring 4, and the other part enters through the ventilation hole 4a, the second air outlet gap 10 between the chassis 1 and the inner air outlet ring 4, and the first air outlet gap 9 and the second air outlet gap 10 discharge air at the same time to cool the membrane.

Claims

1. A double-air-inlet air ring of a film blowing machine, comprising a chassis and a lower air-distributing ring which is sealed and connected to the outer edge of the chassis, an inner air outlet ring is arranged above the chassis, a ventilation ring is sealed and connected to the outer edge of the lower air-distributing ring, an upper air-distributing ring is sealed and connected to the inner edge of the ventilation ring, the upper air-distributing ring is distributed above the lower air-distributing ring and there is an air inlet gap between the two, a plurality of groups of air inlet tubes are evenly distributed on the outer periphery of the ventilation ring, an outgoing air ring is arranged above the inner air outlet ring, a first air outlet gap is arranged between the outgoing air ring and the inner air outlet ring, a second air outlet gap is arranged between the chassis and the inner air outlet ring, a plurality of groups of ventilation holes are arranged on the outer edge of the inner air outlet ring, an upper air shielding ring assembly is arranged between the outer edge of the outgoing air ring and the inner edge of the upper air-distributing ring, and the characteristics are as follows: The upper end surface of the lower uniform wind ring is provided with a plurality of groups of flow guides evenly spaced along the circumferential direction, a gas flow passage exists between each two adjacent groups of flow guides, and the upper parts of the flow guides are in contact with the lower end surface of the upper uniform wind ring.

2. The double tuyere air ring of the film blowing machine according to claim 1, characterized in that: The guide member includes two groups of first cone bodies and second cone bodies which are symmetrically distributed and both have a cone shape. The large end of the first cone body is connected to the large end of the second cone body. A V-shaped air inlet passage is formed between each two adjacent groups of first cone bodies, and a V-shaped air outlet passage is formed between each two adjacent groups of second cone bodies. The V-shaped air inlet passage and the V-shaped air outlet passage are interconnected and together form a gas flow passage.

3. The double tuyere air ring of the film blowing machine according to claim 2, characterized in that: The guide member also includes a guide block, which is distributed between the first cone and the second cone and located above the first cone and the second cone. The lower end surface of the upper air uniforming ring is provided with a positioning ring groove corresponding to the guide block, and several groups of guide blocks are inserted into the positioning ring groove.

4. The double tuyere air ring of the film blowing machine according to any one of claims 1 to 3, characterized in that: A limiting mechanism is arranged between the upper air uniforming ring and the ventilation ring, and the limiting mechanism comprises a limiting block, one end of which is pressed above the inner edge of the ventilation ring, and the other end of the limiting block is detachably connected with a threaded connector, and the lower end of the threaded connector is detachably connected to the outer edge of the upper air uniforming ring.

5. The double tuyere air ring of the film blowing machine according to any one of claims 1 to 3, characterized in that: The upper wind shield ring assembly includes a first wind shield ring and a second wind shield ring. The outer edge of the first wind shield ring is sealed to the inner edge of the upper wind uniforming ring, the inner edge of the first wind shield ring is sealed to the outer edge of the second wind shield ring, and the inner edge of the second wind shield ring is sealed to the outer edge of the outgoing wind ring.

6. The double tuyere air ring of the film blowing machine according to claim 5, characterized in that: A support ring is provided between the second wind shield ring and the outgoing wind ring, and a mounting flange ring is provided above the second wind shield ring and near the outer edge of the second wind shield ring. The outer circumference of the support ring is sealedly connected to the inner circumference of the mounting flange ring, and a deformable gap is provided between the outer circumference of the outgoing wind ring and the inner circumference of the support ring.

7. The double tuyere air ring of the film blowing machine according to claim 6, characterized in that: The outer peripheries of the first wind shielding ring, the second wind shielding ring and the outgoing wind ring are respectively connected with pillars protruding outwards.

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