Film blow molding machine

Abstract

The invention provides a film blowing machine which comprises a die head used for injecting compressed air, the die head comprises a first barrel, a flow dividing disc and a conical barrel, the conical barrel is fixed to the bottom end face of the flow dividing disc, and the conical barrel is a vertically-through barrel-shaped body. In the first state, a diversion channel port at the bottom end of the diversion disc is shielded by the steering disc, only one compressed air outlet at the bottom end of the conical barrel is left, and the die head is used as a traditional die head so as to adapt to products such as narrow-mouth plastic bottles; in the second state, an air outlet in the bottom end of the conical barrel and a plurality of branch flow channel air outlets distributed in the branch flow disc at equal intervals are formed, that is, the air outlet area is increased, the air outlet range is expanded, it is ensured that compressed air is correctly guided in a short time, and it is ensured that a film product like a plastic bag is located at the air outlet and located on the same straight line with the air flow direction; and the forward influence of the air which flows back after being in contact with the plastic film on the conical barrel or the shunting disc which is blowing out is reduced.

Description

Technical Field

[0001] The present invention relates to a film blowing machine, belonging to the field of film production equipment. Background Art

[0002] A film blowing machine is a device for producing plastic films and belongs to plastic processing machines. Its working principle is to heat and plasticize plastic raw materials through a screw extruder, then extrude a tubular plastic preform from a die head, and then use an air ring to blow and cool and a tractor to pull. At the same time, compressed air is introduced into the preform to blow the preform into a film, and finally the film is wound into a roll by a winding machine.

[0003] One of the reasons for the poor heat sealability of the produced plastic film is that during the injection process, the blow-up ratio causes the film to undergo tensile orientation. And for some products, such as wide-mouth plastic bags, etc., during the blowing process, due to the too-fast blowing speed, the just-blown plastic bag is too thin, and the compressed air guiding is incorrect, it is very easy to cause the situation that one side of the plastic bag is thick and the other side is thin, and the quality of the produced product is poor and cannot be used.

[0004] In view of this, the present invention provides a die head structure with double air outlets that can improve the uniformity of compressed air injection and ensure the correct air injection guiding direction, as well as a film blowing machine. Summary of the Invention

[0005] The present invention provides a film blowing machine, which can effectively solve the above problems.

[0006] The present invention is implemented as follows:

[0007] A die head structure with double air outlets includes a die head for injecting compressed air. The die head includes a first cylinder body, a flow dividing plate, and a conical cylinder. The conical cylinder is fixedly arranged at the bottom end face of the flow dividing plate. The conical cylinder is a cylinder body that is vertically penetrated, and the flow dividing plate is detachably and fixedly connected to the bottom end of the first cylinder body;

[0008] Wherein, a plurality of flow dividing channels are formed on the flow dividing plate. One end of each flow dividing channel is opened on the curved inner wall of the flow dividing plate, and the other end penetrates through the bottom end face of the flow dividing plate;

[0009] The die head further includes a steering plate, and the steering plate is detachably installed on the bottom end face of the flow dividing plate to connect or block the port of the flow dividing channel at the bottom end of the flow dividing plate.

[0010] As a further improvement, a plurality of fixing holes are formed on the bottom end face of the flow dividing plate adjacent to the air outlet of the flow dividing channel. The number of the fixing holes is twice the number of the flow dividing channels, and every two fixing holes cooperate with one flow dividing channel;

[0011] Second fixing holes and second air outlets are formed on the steering plate corresponding to the fixing holes and the air outlets of the flow dividing channels;

[0012] When the second air outlet and the air outlet of the flow dividing channel are on the same axis, the flow dividing channel is in the air outlet state;

[0013] On the contrary, when the second air outlet and the air outlet of the flow dividing channel are on the same axis, the flow dividing channel is in the closed state.

[0014] As a further improvement, the flow dividing disc is an L-shaped pipe composed of a horizontal part and a vertical part that are perpendicular to each other.

[0015] As a further improvement, fixed heads are fixed on the top end surface of the flow dividing disc that contacts the bottom end surface of the first cylinder body. There are two or more fixed heads, which are fixedly matched with the grooves at the bottom end of the first cylinder body.

[0016] As a further improvement, the first cylinder body is connected with an air inlet pipe for air inlet, and a dynamic pressure sensor for measuring the internal dynamic pressure of the first cylinder body. The dynamic pressure sensor is connected to a microcontroller installed on the outer surface of the first cylinder body.

[0017] As a further improvement, there is a height difference h between the air inlet pipe and the dynamic pressure sensor, and the height difference h is 0.2 - 1.5 cm.

[0018] As a further improvement, the steering wheel is made of alloy steel material.

[0019] A film blowing machine includes the above-mentioned die structure with double air outlets.

[0020] A control method, based on the above-mentioned die structure with double air outlets, specifically includes the following steps:

[0021] Step: The dynamic pressure sensor installed in the first cylinder body quickly captures the real-time wind pressure value and transmits the measured pressure value to the microcontroller;

[0022] Step: The microcontroller amplifies, filters, and converts the pressure value of the wind pressure in the first cylinder body obtained into a digital signal through AD to realize the conditioning of the signal;

[0023] Step: Remote detection is carried out through the communication interface in the microcontroller by means of wireless transmission or data transmission; and the shell of the microcontroller is made of magnetic stainless steel material to reduce the interference of equipment signals;

[0024] Step: Set the initial threshold of the wind pressure on the remote terminal, compare the measured real-time wind pressure value with it, and if there is a pressure difference, it is necessary to timely adjust the air intake volume of the air inlet pipe.

[0025] Further, the detailed processing steps of the above step are as follows:

[0026] Step: Amplify the real-time wind pressure value measured by the dynamic pressure sensor through an operational amplifier;

[0027] Step: Eliminate the high-frequency noise in the real-time wind pressure value through an RC low-pass filter or digital filtering;

[0028] Step: Convert the analog signal into a digital signal through the ADC module.

[0029] The beneficial effects of the present invention are as follows: The present invention has two usage states. In the first state: The diversion channel port at the bottom of the diversion disk is shielded by the steering wheel, leaving only one compressed air outlet at the bottom of the conical cylinder, which is used as a traditional die head to adapt to products such as plastic bottles with narrow mouths. In the second state: When the second air outlet and the air outlet of the diversion channel are on the same axis, the diversion channel is in the air outlet state, with an air outlet at the bottom of the conical cylinder and several equally spaced air outlets on the diversion disk. That is to say, the air outlet at the bottom of the conical cylinder is the main one, and the uniform air outlet of the diversion channel is the auxiliary one, which improves the air outlet area, expands the air outlet range, ensures the correct orientation of the compressed air in a short time, and ensures that the plastic film product like a plastic bag is in the same straight line as the air flow direction at the air outlet, reducing the positive impact of the air flowing back after contacting the plastic film on the conical cylinder or the diversion disk that is discharging air. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of a dual-air outlet die head structure provided by an embodiment of the present invention.

[0032] Figure 2 It is an exploded schematic diagram of the die head structure of a dual-air outlet die head structure provided by an embodiment of the present invention.

[0033] Figure 3 It is a schematic plan view of the die head of a dual-air outlet die head structure provided by an embodiment of the present invention.

[0034] Figure 4 It is a schematic structural diagram of the diversion disk of a dual-air outlet die head structure provided by an embodiment of the present invention.

[0035] Figure 5 It is a schematic diagram of the cooperation principle of the fixing head and the groove on the first cylinder of a dual-air outlet die head structure provided by an embodiment of the present invention.

[0036] Reference numerals: hydraulic cylinder mounting head 10, hydraulic cylinder 20, guiding assembly 30, die head 40, first cylinder body 401, microcontroller 402, shunt plate 403, steering wheel 404, conical cylinder 405, air inlet pipe 406, dynamic pressure sensor 407, shunt channel 431, fixing hole 432, fixing head 433, second fixing hole 441, second air outlet 442. Detailed implementation manners

[0037] To make the purposes, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0039] Embodiment 1

[0040] Referring to Figures 1 - 5 As shown, this embodiment provides a specific implementation manner regarding a die head structure with double air outlets, including a die head 40 for injecting compressed air. The die head 40 includes a first cylinder body 401, a shunt plate 403, and a conical cylinder 405. The bottom end surface of the shunt plate 403 is fixedly provided with a conical cylinder 405. The conical cylinder 405 is a cylinder body that is vertically through. The shunt plate 403 is detachably and fixedly connected to the bottom end of the first cylinder body 401;

[0041] Among them, a plurality of shunt channels 431 are formed on the shunt plate 403. One end of the shunt channel 431 is opened on the curved inner wall of the shunt plate 403, and the other end penetrates through the bottom end surface of the shunt plate 403;

[0042] The die head 40 further includes a steering wheel 404, and the steering wheel 404 is detachably mounted on the bottom end surface of the flow dividing plate 403 to connect or shield the ports of the flow channels 431 at the bottom end of the flow dividing plate 403.

[0043] The present invention has two usage states. In the first state: the steering wheel 404 is used to shield the ports of the flow channels 431 at the bottom end of the flow dividing plate 403, leaving only one compressed air outlet at the bottom end of the conical cylinder 405, and it is used as a traditional die head to adapt to products such as narrow-mouth plastic bottles. In the second state: when the second air outlet 442 and the air outlet of the flow channel 431 are on the same axis, the flow channel 431 is in the air outlet state, having an air outlet at the bottom end of the conical cylinder 405 and several equally spaced air outlets of the flow channels 431 on the flow dividing plate 403. That is to say, the air outlet at the bottom end of the conical cylinder 405 is the main, and the uniform air outlet of the flow channels 431 is the auxiliary, which increases the air outlet area, expands the air outlet range, ensures the correct guidance of the compressed air in a short time, and ensures that for film products like plastic bags, they are in the same straight line as the air flow direction at the air outlet, reducing the positive impact of the air flowing back after contacting the plastic film on the conical cylinder 405 or the flow dividing plate 403 that is discharging air.

[0044] In this embodiment, a plurality of fixing holes 432 are formed on the bottom end surface of the flow dividing plate 403 adjacent to the air outlets of the flow channels 431. The number of the fixing holes 432 is twice the number of the flow channels 431, and every two fixing holes 432 cooperate with one flow channel 431. The specific distribution is that one of the fixing holes 432 and the air outlet of the flow channel 431 are on the same radius of the flow dividing plate 403.

[0045] On the steering wheel 404 corresponding to the fixing holes 432 and the air outlets of the flow channels 431, second fixing holes 441 and second air outlets 442 are formed.

[0046] When the second air outlet 442 and the air outlet of the flow channel 431 are on the same axis, the flow channel 431 is in the air outlet state.

[0047] Conversely, when the second air outlet 442 and the air outlet of the flow channel 431 are on the same axis, the flow channel 431 is in the closed state.

[0048] In this embodiment, the flow dividing plate 403 is an L-shaped pipe composed of a horizontal part and a vertical part that are perpendicular to each other; it guides the air volume in the first cylinder body 401 to the flow dividing plate 403, without the need to additionally set an air inlet pipe, and is paired with a control valve or other control components for controlling the air volume, reducing the production and manufacturing costs of parts.

[0049] In other embodiments, the transition between the horizontal and vertical portions of the present invention is arc-shaped, reducing the pressure loss of the compressed air during conduction, ensuring that the compressed air after passing through the flow diversion disc 403 still has a high-intensity wind force, capable of blow molding the thin film plastic bag.

[0050] In this embodiment, a fixing head 433 is fixed on the top end surface of the flow diversion disc 403 in contact with the bottom end surface of the first cylinder 401. There are two or more fixing heads 433, which are fixedly matched with the grooves at the bottom end of the first cylinder 401. The shapes of the grooves and the fixing heads 433 correspond to each other. The so-called fitting and fixing here includes but is not limited to clamping and rotational fitting.

[0051] In this embodiment, the first cylinder 401 is connected with an air inlet pipe 406 for air intake, and a dynamic pressure sensor 407 for measuring the internal dynamic pressure of the first cylinder 401. The dynamic pressure sensor 407 is connected to a microcontroller 402 installed on the outer surface of the first cylinder 401.

[0052] In this embodiment, there is a height difference h between the air inlet pipe 406 and the dynamic pressure sensor 407. The height difference h is 0.2 - 1.5 cm. The dynamic pressure sensor 407 avoids the turbulent area, is far from the inlet and outlet of the compressed air, and is aligned with the air flow direction, sensitively perceiving the slight changes of the compressed air. The optimal height difference is 0.5 cm, far from the inlet of the compressed air, and there is also a certain height difference from the outlet of the compressed air.

[0053] In other embodiments, the steering disc 404 is made of alloy steel material, which is an iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel, having special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetism. It can withstand collisions and will not adhere to the plastic film, with strong practical performance.

[0054] Embodiment 2

[0055] A film blowing machine includes the dual-outlet die structure described in the embodiment.

[0056] Embodiment 3

[0057] A control method, based on the dual-outlet die structure described in Embodiment 1, specifically includes the following steps:

[0058] Step 1: The dynamic pressure sensor 407 installed in the first cylinder 401 quickly captures the real-time wind pressure value and transmits the measured pressure value to the microcontroller 402;

[0059] Step 2: The microcontroller 402 amplifies, filters, and converts the acquired pressure value of the wind pressure of the first cylinder body 401 into a digital signal to achieve signal conditioning.

[0060] Step 3: Remote detection is performed through the communication interface in the microcontroller 402 using a wireless transmission method or a data transmission method; and the housing of the microcontroller 402 is made of magnetic stainless steel material to reduce interference of device signals.

[0061] Step 4: Set the initial threshold of the wind pressure on the remote terminal, compare the measured real-time wind pressure value with it, and if there is a pressure difference, the air intake volume of the air inlet pipe 406 needs to be adjusted in time.

[0062] Furthermore, the detailed processing steps of Step 2 are as follows:

[0063] Step 21: The real-time wind pressure value measured by the dynamic pressure sensor 407 is amplified through an operational amplifier.

[0064] Step 22: High-frequency noise in the real-time wind pressure value is eliminated through an RC filter or digital filtering.

[0065] Step 23: The analog signal is converted into a digital signal through the ADC module.

[0066] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-air outlet die structure, characterized in that: The invention comprises a die head (40) for injecting compressed air, wherein the die head (40) comprises a first barrel (401), a diverter plate (403) and a conical barrel (405), wherein the conical barrel (405) is fixed to the bottom end surface of the diverter plate (403), wherein the conical barrel (405) is a cylindrical body that passes through from top to bottom, and the diverter plate (403) is detachably fixedly connected to the bottom end of the first barrel (401); The diverter plate (403) is provided with a plurality of diverter channels (431), wherein the diverter channels (431) are opened on the curved inner wall of the diverter plate (403) at one end of the diverter plate (403) and penetrate the bottom end surface of the diverter plate (403) at the other end; The die head (40) further comprises a steering disc (404), and the steering disc (404) is detachably mounted on the bottom end surface of the diverter disc (403) to connect with or shield the diverter channel (431) port at the bottom end of the diverter disc (403).

2. A double-air outlet die structure as claimed in claim 1, characterized in that: A plurality of fixing holes (432) are formed on the bottom end surface of the diverter plate (403) adjacent to the air outlet of the diverter channel (431), the number of the fixing holes (432) is twice the number of the diverter channels (431), and every two fixing holes (432) are matched with one diverter channel (431); A second fixing hole (441) and a second air outlet (442) are formed on the steering wheel (404) corresponding to the fixing hole (432) and the air outlet of the diverter channel (431); When the second air outlet (442) and the air outlet of the branch channel (431) are on the same axis, the branch channel (431) is in an air outlet state; Conversely, when the second air outlet (442) and the air outlet of the branch channel (431) are on the same axis, the branch channel (431) is in a closed state.

3. A double-air outlet die structure as claimed in claim 2, characterized in that: The diverter plate (403) is an L-shaped pipeline formed by a horizontal portion and a vertical portion that are perpendicular to each other.

4. A double-air outlet die structure as claimed in claim 1, characterized in that: A fixing head (433) is fixed on the top surface of the diverter plate (403) that contacts the bottom surface of the first cylinder (401). There are two or more fixing heads (433) that are fixed in cooperation with the grooves at the bottom end of the first cylinder (401).

5. A double-air outlet die structure as claimed in claim 1, characterized in that: The first cylinder (401) is connected to an air inlet pipe (406) for air intake, and a dynamic pressure sensor (407) for measuring the inside of the first cylinder (401), and the dynamic pressure sensor (407) is connected to a microcontroller (402) installed on the outer surface of the first cylinder (401).

6. A double-air outlet die structure as claimed in claim 5, characterized in that: There is a height difference h between the air inlet pipe (406) and the dynamic pressure sensor (407), and the height difference h is 0.2-1.5 cm.

7. A double-air outlet die structure as claimed in claim 2, characterized in that: The steering wheel (404) is made of alloy steel material.

8. A film blowing machine, characterized in that: It comprises the double-air outlet die structure as described in any one of claims 1 to 7.

9. A control method, characterized in that: The double-air outlet die structure according to any one of claims 1 to 7 specifically comprises the following steps: Step 1: A dynamic pressure sensor (407) installed in the first cylinder (401) quickly captures the real-time wind pressure value and transmits the measured pressure value to the microcontroller (402); Step 2: The microcontroller (402) amplifies, filters, and AD-converts the acquired pressure value of the wind pressure of the first cylinder (401) into a digital signal to achieve signal conditioning; Step 3: remote detection is performed through a communication interface in the microcontroller (402) using a wireless transmission method or a data transmission method; and the housing of the microcontroller (402) is made of a magnetic stainless steel material to reduce interference with device signals; Step 4: Set an initial wind pressure threshold on the remote terminal and compare the measured real-time wind pressure value with it. If there is a pressure difference, the air intake of the air inlet pipe (406) needs to be adjusted in time.

10. A control method according to claim 9, characterized in that: The detailed processing steps of step 2 are as follows: Step 21: amplifying the real-time wind pressure value measured by the dynamic pressure sensor (407) through an operational amplifier; Step 22: Eliminate high-frequency noise in the real-time wind pressure value through an RC filter or digital filtering; Step 23: Convert the analog signal into digital signal through the ADC module.

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