A film blowing machine

Abstract

The present application provides a kind of film blow molding machine, including the die head for injecting compressed air, the die head includes first cylinder, shunt disc and conical cylinder, the bottom end surface of the shunt disc is fixed with conical cylinder, the conical cylinder is the through cylinder body, the present application has two kinds of use state, first state: using steering wheel to shield the shunt disc bottom end shunt channel port, only one compressed air outlet at the bottom end of conical cylinder, when doing traditional die head to use, to adapt to narrow mouth plastic bottle and the like product;Second state: with the air outlet at the bottom end of conical cylinder and the air outlet of several equidistant distribution shunt channel on shunt disc, that is, improve the area of air outlet, expand the air outlet range, ensure that compressed air is guided correctly in a short time, ensure that like plastic bag like film product at air outlet, with the flow direction of wind is on the same straight line, reduce the air for the conical cylinder or shunt disc being blown out after contacting plastic film back flow positive influence.

Description

Technical Field

[0001] This invention relates to a film blowing machine, belonging to the field of film production equipment. Background Technology

[0002] A film blow molding machine is a type of equipment used to produce plastic films and belongs to the category of plastic processing machinery. Its working principle is to heat and plasticize the plastic raw material through a screw extruder, then extrude a tubular plastic preform from the die, cool it with air from the air ring and pull it with a traction machine, while simultaneously introducing compressed air into the preform to inflate it into a film, and finally wind the film into a roll by a winding machine.

[0003] One reason why the produced plastic film has poor heat-sealing properties is that during the injection process, the blow-up ratio causes the film to stretch and orient itself. In addition, for some products, such as wide-mouth plastic bags, the blow-up speed is too fast during the blow molding process, and the newly blown plastic bag is too thin. If the compressed air is not directed correctly, it is easy to cause the plastic bag to be thick on one side and thin on the other side, resulting in poor product quality and unusable products.

[0004] In response, the present invention provides a die structure with dual air outlets that improves the uniformity of compressed air injection and ensures correct air injection guidance, as well as a film blow molding machine. Summary of the Invention

[0005] This invention provides a film blow molding machine that can effectively solve the above-mentioned problems.

[0006] This invention is implemented as follows:

[0007] A dual-outlet mold structure includes a mold head for injecting compressed air. The mold head includes a first cylinder, a flow divider, and a conical cylinder. The conical cylinder is fixed to the bottom end face of the flow divider. The conical cylinder is a cylindrical body that runs vertically through the top and bottom. The flow divider is detachably and fixedly connected to the bottom end of the first cylinder.

[0008] The flow distribution plate has several flow distribution channels. The flow distribution channels are opened at one end of the curved inner wall of the flow distribution plate and at the other end through the bottom end face of the flow distribution plate.

[0009] The mold head also includes a steering wheel, which is detachably mounted on the bottom surface of the distributor plate to connect to or cover the distributor channel port at the bottom of the distributor plate.

[0010] As a further improvement, the bottom surface of the diversion plate adjacent to the air outlet of the diversion channel is provided with a number of fixing holes, the number of fixing holes being twice the number of diversion channels, and each pair of fixing holes cooperating with one diversion channel.

[0011] A second fixing hole and a second air outlet are provided on the steering wheel corresponding to the fixing hole and the air outlet of the diversion channel;

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

[0013] Conversely, when the second air outlet and the air outlet of the branch channel are not on the same axis, the branch channel is in a closed state.

[0014] As a further improvement, the diversion channel is an L-shaped pipe composed of mutually perpendicular horizontal and vertical sections.

[0015] As a further improvement, a fixing head is fixed on the top surface of the diverter plate that contacts the bottom end surface of the first cylinder. There are two or more fixing heads, which are fixed in conjunction with the groove at the bottom end of the first cylinder.

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

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

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

[0019] A film blow molding machine includes the aforementioned dual-outlet die structure.

[0020] A control method, based on the dual-outlet nozzle structure, specifically includes the following steps:

[0021] Step 1: The dynamic pressure sensor installed in the first cylinder quickly captures the real-time wind pressure value and transmits the measured pressure value to the micro controller;

[0022] Step 2: The microcontroller amplifies, filters, and converts the pressure value of the first cylinder air pressure into a digital signal through AD conversion, thereby achieving signal conditioning;

[0023] Step 3: Remote detection is performed via wireless or data transmission through the communication interface in the microcontroller; and the casing of the microcontroller is made of magnetic stainless steel to reduce interference with device signals.

[0024] Step 4: Set the initial wind pressure threshold on the remote terminal and compare it with the measured real-time wind pressure value. If there is a pressure difference, the air intake volume of the air intake pipe needs to be adjusted in time.

[0025] Furthermore, step 2 also includes the following:

[0026] Step 21: Amplify the real-time wind pressure values ​​obtained from the dynamic pressure sensor using an operational amplifier;

[0027] Step 22: Eliminate high-frequency noise in real-time wind pressure values ​​using an RC-pass filter or digital filter;

[0028] Step 23: Convert the analog signal into a digital signal using the ADC module.

[0029] The beneficial effects of this invention are as follows: This invention has two usage states. In the first state, the flow channel port at the bottom of the flow distribution plate is covered by a steering wheel, leaving only one compressed air outlet at the bottom of the conical cylinder, which can be used as a traditional nozzle to accommodate products such as narrow-mouthed plastic bottles. In the second state, when the second air outlet and the air outlet of the flow distribution plate are on the same axis, the flow distribution plate is in the air outlet state, with the air outlet at the bottom of the conical cylinder and several equally spaced flow channel air outlets on the flow distribution plate. That is to say, the air outlet at the bottom of the conical cylinder is the main source, and the uniform air outlet of the flow distribution plate is the auxiliary source, which increases the air outlet area, expands the air outlet range, ensures the correct guidance of compressed air in a short time, and ensures that film products such as plastic bags are on the same straight line as the airflow at the air outlet, reducing the positive impact of the air flowing back after contacting the plastic film on the conical cylinder or flow distribution plate that is currently outleting air. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a dual-outlet nozzle structure provided in an embodiment of the present invention.

[0032] Figure 2 This is an exploded view of the die head structure of a dual-outlet die structure provided in an embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the die head of a dual-outlet die structure provided in an embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of a flow divider structure with a dual-outlet nozzle provided in an embodiment of the present invention.

[0035] Figure 5This is a schematic diagram illustrating the working principle of the fixed head of the dual-outlet nozzle structure and the groove on the first cylinder, according to an embodiment of the present invention.

[0036] Reference numerals: Hydraulic cylinder mounting head 10, hydraulic cylinder 20, guide assembly 30, mold head 40, first cylinder 401, microcontroller 402, flow divider 403, steering wheel 404, conical cylinder 405, air inlet pipe 406, dynamic pressure sensor 407, flow divider channel 431, fixing hole 432, fixing head 433, second fixing hole 441, second air outlet 442. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection 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 to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] Example 1

[0040] Reference Figures 1-5 As shown, this embodiment provides a specific implementation of a dual-outlet mold structure, including a mold head 40 for injecting compressed air. The mold head 40 includes a first cylinder 401, a flow divider 403, and a conical cylinder 405. The conical cylinder 405 is fixed to the bottom end face of the flow divider 403. The conical cylinder 405 is a cylindrical body that runs vertically through the top and bottom. The flow divider 403 is detachably and fixedly connected to the bottom end of the first cylinder 401.

[0041] The diversion plate 403 has a plurality of diversion channels 431. The diversion channel 431 is opened at one end of the diversion plate 403 on the curved inner wall of the diversion plate 403, and the other end penetrates the bottom end face of the diversion plate 403.

[0042] The mold head 40 also includes a steering wheel 404, which is detachably mounted on the bottom surface of the distributor plate 403 to connect to or cover the distributor channel 431 port at the bottom of the distributor plate 403.

[0043] This invention has two usage states. In the first state, the port of the diversion channel 431 at the bottom of the diversion plate 403 is covered by the steering wheel 404, leaving only a compressed air outlet at the bottom of the conical cylinder 405, which is used as a traditional nozzle to accommodate products such as narrow-mouthed plastic bottles. In the second state, when the second air outlet 442 and the air outlet of the diversion channel 431 are on the same axis, the diversion channel 431 is in the air outlet state, and has the air outlet at the bottom of the conical cylinder 405 and the diversion plate 404. The cone 405 has several equally spaced air outlets 431, meaning that the air outlet at the bottom of the cone 405 is the main outlet, while the uniform air outlet of the air outlets 431 is secondary. This increases the air outlet area and expands the air outlet range, ensuring that the compressed air is guided correctly in a short time. It also ensures that the film product, like a plastic bag, is in the same straight line as the airflow at the air outlet, reducing the positive impact of the air flowing back after contacting the plastic film on the cone 405 or the air outlet 403.

[0044] In this embodiment, a plurality of fixing holes 432 are formed on the bottom end face of the diversion plate 403 adjacent to the air outlet of the diversion channel 431. The number of fixing holes 432 is twice the number of diversion channels 431, and every two fixing holes 432 are matched with one diversion channel 431. Specifically, one fixing hole 432 and the air outlet of the diversion channel 431 are on the same radius of the diversion plate 403.

[0045] A second fixing hole 441 and a second air outlet 442 are provided on the steering wheel 404 corresponding to the air outlet of the fixing hole 432 and the air outlet of the diversion channel 431;

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

[0047] Conversely, when the second air outlet 442 and the air outlet of the diversion channel 431 are not on the same axis, the diversion channel 431 is in a closed state.

[0048] In this embodiment, the diversion channel 431 is an L-shaped pipe composed of mutually perpendicular horizontal and vertical parts; the air volume in the first cylinder 401 is guided to the diversion plate 403, without the need to set up an additional air inlet pipe, and with the addition of a control valve or other control components to control the air volume, the cost of manufacturing components is reduced.

[0049] In other embodiments, the junction between the horizontal and vertical parts of the present invention is arc-shaped to reduce the pressure loss of compressed air during the transmission process and ensure that the compressed air after the flow distribution plate 403 still has high-intensity wind force, which can blow-form the thin film plastic bag.

[0050] In this embodiment, 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, which are fixed in conjunction with the groove at the bottom of the first cylinder 401. The groove corresponds to the shape of the fixing head 433. The fixing in conjunction here includes, but is not limited to, locking and rotating engagement.

[0051] In this embodiment, the first cylinder 401 is connected to an air inlet pipe 406 for air intake and a dynamic pressure sensor 407 for measuring the internal 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 0.2-1.5cm. The dynamic pressure sensor 407 avoids the turbulent area, is far away from the inlet and outlet of the compressed air, and is aligned with the airflow direction to sensitively detect slight changes in the compressed air. The optimal height difference is 0.5cm, which is far away from the inlet of the compressed air and also has a certain height difference from the outlet of the compressed air.

[0053] In other embodiments, the steering wheel 404 is made of alloy steel, which is an iron-carbon alloy formed by adding appropriate amounts of one or more alloying elements to ordinary carbon steel. It has special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetic properties. It can withstand impacts and will not stick to plastic film, making it highly practical.

[0054] Example 2

[0055] A film blow molding machine includes the dual-outlet die structure described in the embodiments.

[0056] Example 3

[0057] A control method, based on the dual-outlet nozzle structure described in Example 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 pressure value of the first cylinder 401 into a digital signal through AD conversion, thereby achieving signal conditioning;

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

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

[0062] Furthermore, step 2 also includes the following:

[0063] Step 21: Amplify the real-time wind pressure value obtained by the dynamic pressure sensor 407 using an operational amplifier;

[0064] Step 22: Eliminate high-frequency noise in real-time wind pressure values ​​using an RC-pass filter or digital filter;

[0065] Step 23: Convert the analog signal into a digital signal using the ADC module.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A dual-outlet nozzle structure, characterized in that, Includes a die head (40) for injecting compressed air, the die head (40) comprising a first cylinder (401), a flow divider (403) and a conical cylinder (405), the bottom end face of the flow divider (403) being fixed with the conical cylinder (405), the conical cylinder (405) being a cylindrical body that runs vertically through the top and bottom, the flow divider (403) being detachably and fixedly connected to the bottom end of the first cylinder (401); The flow distribution plate (403) has several flow distribution channels (431). The flow distribution channel (431) is located at one end of the curved inner wall of the flow distribution plate (403) and at the other end it penetrates the bottom end face of the flow distribution plate (403). The mold head (40) also includes a steering wheel (404), and the steering wheel (404) is detachably mounted on the bottom surface of the distributor plate (403) to connect to or cover the distributor channel (431) port at the bottom of the distributor plate (403); The first cylinder (401) is connected to an air inlet pipe (406) for air intake, a dynamic pressure sensor (407) for measuring the inside of the first cylinder (401), and a microcontroller (402) installed on the outer surface of the first cylinder (401). There is a height difference h between the air inlet pipe (406) and the dynamic pressure sensor (407), and the height difference h is 0.2-1.5cm.

2. The dual-outlet nozzle structure as described in claim 1, characterized in that, The bottom surface of the diversion plate (403) adjacent to the air outlet of the diversion channel (431) has a number of fixing holes (432). The number of fixing holes (432) is twice the number of diversion channels (431), and every two fixing holes (432) are matched with one diversion channel (431). A second fixing hole (441) and a second air outlet (442) are provided on the steering wheel (404) corresponding to the air outlet of the fixing hole (432) and the diversion channel (431). When the second air outlet (442) and the air outlet of the diversion channel (431) are on the same axis, the diversion channel (431) is in the air outlet state; Conversely, when the second air outlet (442) and the air outlet of the diversion channel (431) are not on the same axis, the diversion channel (431) is in a closed state.

3. The dual-outlet nozzle structure as described in claim 2, characterized in that, The diversion channel (431) is an L-shaped pipe composed of mutually perpendicular horizontal and vertical sections.

4. The dual-outlet nozzle structure as described in claim 1, characterized in that, The top surface of the diverter plate (403) that contacts the bottom surface of the first cylinder (401) is fixed with a fixing head (433). There are two or more fixing heads (433), which are fixed in conjunction with the groove at the bottom of the first cylinder (401).

5. The dual-outlet nozzle structure as described in claim 2, characterized in that, The steering wheel (404) is made of alloy steel.

6. A film blow molding machine, characterized in that, The nozzle structure includes the dual-outlet structure as described in any one of claims 1-5.

7. A control method, characterized in that, The dual-outlet nozzle structure according to any one of claims 1-5 specifically includes the following steps: 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). Step 2: The microcontroller (402) amplifies, filters, and converts the pressure value of the wind pressure of the first cylinder (401) into a digital signal through AD conversion, thereby achieving signal conditioning; Step 3: Remote detection is performed via wireless transmission or data transmission through the communication interface of the microcontroller (402); and the casing of the microcontroller (402) is made of magnetic stainless steel to reduce interference with device signals; Step 4: Set the initial wind pressure threshold on the remote terminal and compare it with the measured real-time wind pressure value. If there is a pressure difference, the air intake of the air intake pipe (406) needs to be adjusted in time.

8. The control method as described in claim 7, characterized in that, Step 2 also includes the following: Step 21: Amplify the real-time wind pressure value obtained by the dynamic pressure sensor (407) using an operational amplifier; Step 22: Eliminate high-frequency noise in real-time wind pressure values ​​using an RC-pass filter or digital filter; Step 23: Convert the analog signal into a digital signal using the ADC module.

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