A clean packaging bag blow molding apparatus

Abstract

The present application relates to the technical field of plastic blow molding bag making machines, and discloses a clean packaging bag blow molding device, which comprises a mounting frame, a filter tank for cleaning and filtering gas is mounted in the mounting frame, and a die head is mounted at the bottom of the mounting frame; a ring-shaped cold gas cavity is formed in the die head, a plurality of gas guide mechanisms are arranged in the cold gas cavity, the gas guide mechanism comprises a gas outlet chamber, an installation cavity is formed in the die head, the installation cavity and the cold gas cavity are communicated, the gas outlet chamber is installed in the installation cavity, two gas outlet cavities in different directions are formed in the gas outlet chamber, and a square opening is arranged on the gas outlet cavity; a forming die is arranged below the die head, and a negative pressure mechanism is mounted in the forming die; through the above technical scheme, the clean forming of the packaging bag can be realized.

Description

Technical Field

[0001] This invention relates to the field of plastic blow molding bag making machinery technology, specifically to a clean packaging bag blow molding equipment. Background Technology

[0002] A blow molding machine sprays liquid plastic and then uses the airflow from the machine to blow the plastic body into a mold cavity of a certain shape to make a product. This type of machine is called a blow molding machine and is one of the commonly used equipment for producing plastic bags.

[0003] Clean packaging bags require strict cleanliness during the blow molding process, necessitating the use of clean, impurity-free air. Otherwise, impurities can adhere to the bags, compromising their cleanliness. However, current blow molding equipment often introduces ambient air directly, allowing airborne impurities to directly contact the molten plastic and negatively impact product quality. Furthermore, the extruded plastic film needs rapid cooling during blow molding. Traditional air cooling methods suffer from low efficiency and uneven cooling, leading to inconsistent bag thickness and affecting product quality. Therefore, improving air cleanliness and optimizing cooling during the blow molding process are crucial challenges in clean packaging bag production. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a clean packaging bag blow molding equipment, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a clean packaging bag blow molding device, including a mounting frame. A filter tank for cleaning and filtering gas is installed within the mounting frame. A die head is installed at the bottom of the mounting frame. An annular cold air chamber is formed within the die head, and multiple air guiding mechanisms are provided within the cold air chamber. Each air guiding mechanism includes an outlet chamber. An installation cavity is formed within the die head, and the installation cavity communicates with the cold air chamber. The outlet chamber is installed within the installation cavity and has two outlet chambers in different directions, each with a square opening. A forming mold is located below the die head, and a negative pressure mechanism is installed within the forming mold.

[0006] It also includes sealing plates installed at both ends inside the filter tank, the sealing plates and the ends of the filter tank forming a water storage cavity, a cooling pipe fixedly connected between the two sealing plates, the two ends of the cooling pipe extending into the water storage cavity, and an air inlet and an air outlet fixedly connected to the outer wall of the filter tank.

[0007] It also includes that the two ends of the filter tank are respectively connected to an inlet and an outlet, and that multiple alternating wind baffles are fixedly connected inside the filter tank, with the multiple wind baffles located between two sealing plates.

[0008] It also includes an oil storage chamber fixedly connected to the outer wall of the filter tank, an oil outlet valve installed on the outer wall of the oil storage chamber, and an oil outlet on the inner wall of the filter tank, the oil outlet being connected to the oil storage chamber.

[0009] It also includes an air inlet pipe connected to the air inlet, an air outlet pipe connected to the air outlet, an air guide chamber fixedly connected inside the cold air chamber, two air guide plates fixedly connected to the air guide chamber, and the air outlet chamber located between the two air guide plates.

[0010] It also includes that the air guide chamber is trapezoidal and its surface is arc-shaped to fit the cold air cavity, and the upper and lower bottoms of the air guide chamber are both open structures and are interconnected.

[0011] It also includes that the air outlet pipe is connected to the mounting base, a filter element is fixedly connected inside the mounting base, and an air inlet channel is opened inside the mold head, which is connected to the air inlet pipe.

[0012] It also includes a cooling pipe on the mounting base that communicates with the cooling chamber, the cooling chamber extending into and through the mold head.

[0013] It also includes a clamp fixedly connected between the mounting base and the mold head, the negative pressure mechanism including a motor, the output end of the motor being fixedly connected to a rotating plate, the rotating plate being rotatably connected inside the molding mold, and a vent being provided at the bottom of the molding mold, the vent penetrating the rotating plate.

[0014] It also includes a negative pressure chamber inside the molding mold, a motor installed inside the negative pressure chamber, a piston slidably connected inside the negative pressure chamber, and an electric push rod fixedly connected to the bottom of the molding mold, the telescopic end of the electric push rod extending into the negative pressure chamber and fixedly connected to the piston.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art: 1. The present invention uses a filter tank to wash and filter the compressed air used for blow molding, thereby removing oil and particulate matter from the compressed air, ensuring the cleanliness of the air entering the packaging bag, reducing the scrap rate caused by unclean compressed air. At the same time, the water washing method can also pre-cool the compressed air, which is convenient for subsequent cooling of the mold head and improves the cooling effect.

[0016] 2. The present invention, through the air guiding mechanism, enables the inflated packaging bag to be cooled evenly from the inside out. Furthermore, through the air outlet chambers with air exiting in two different directions, the cold air can simultaneously blow and cool the upper and lower areas of the same position on the packaging bag, improving the uniformity of cold air cooling and reducing the occurrence of uneven thickness and misalignment of the packaging bag due to uneven cooling in certain areas.

[0017] 3. The present invention, through the negative pressure mechanism, can drive the rotating plate to continuously change the position of the air vent, so that the packaging bag can be uniformly adsorbed and shaped by negative pressure at different positions during the downward conveying process, thereby improving the shaping effect. At the same time, the negative pressure value in the negative pressure chamber can be changed by the piston to meet the shaping requirements of packaging bags of different thicknesses. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the filter tank in an embodiment of the present invention; Figure 4 This is another structural schematic diagram of the filter tank in an embodiment of the present invention; Figure 5 This is a schematic diagram of the internal structure of the die head in an embodiment of the present invention; Figure 6 As described in the embodiments of the present invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the air guiding mechanism in an embodiment of the present invention; Figure 8 This is a schematic diagram of the negative pressure mechanism in an embodiment of the present invention.

[0020] The labels in the diagram represent: 1. Mounting frame; 2. Filter tank; 21. Cooling pipe; 22. Baffle plate; 23. Sealing plate; 24. Water inlet; 25. Air inlet; 26. Air outlet; 27. Water outlet; 201. Oil storage chamber; 202. Oil outlet; 203. Oil outlet valve; 204. Air inlet pipe; 205. Air outlet pipe; 3. Molding mold; 4. Mold head; 5. Mounting base; 6. Filter element; 7. Air guiding mechanism; 71. Air outlet chamber; 72. Square opening; 73. Air outlet cavity; 8. Air guiding chamber; 81. Air guiding plate; 9. Negative pressure mechanism; 91. Motor; 92. Rotating plate; 93. Vent; 94. Piston; 95. Electric push rod; 10. Negative pressure chamber; 11. Cold air cavity; 12. Cold air pipe; 13. Clamp; 14. Air inlet channel. Detailed Implementation

[0021] 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 some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] Example 1:

[0024] Please see Figures 1-8 This invention provides a technical solution: a clean packaging bag blow molding equipment, including an installation frame 1, a filter tank 2 for cleaning and filtering gas installed in the installation frame 1, and a die head 4 installed at the bottom of the installation frame 1; an annular cold air chamber 11 is opened in the die head 4, and multiple air guiding mechanisms 7 are arranged in the cold air chamber 11, each air guiding mechanism 7 including an air outlet chamber 71. An installation cavity is opened in the die head 4, the installation cavity and the cold air chamber 11 are connected, the air outlet chamber 71 is installed in the installation cavity, and two air outlet chambers 73 with different directions are opened in the air outlet chamber 71, each air outlet chamber 73 having a square opening 72.

[0025] In practice: the filter tank 2 is used to cool and filter the compressed gas, thereby removing oil mist and particulate matter from the compressed gas, thus improving the purity of the gas during membrane bubble inflation and improving product quality.

[0026] The cooling chamber 11 is used to cool the formed packaging bag, thereby improving the shaping efficiency of the packaging bag after forming and preventing the film bubble from deforming due to high temperature after blowing and forming, which would affect the dimensional accuracy of the finished product. After the cold air enters the cooling chamber 11, it is guided by the air guide chamber 8 and the air guide plate 81 into each air outlet chamber 71, and then blown out through the two air outlet chambers 73 with different orientations in the air outlet chamber 71. This can simultaneously and uniformly cool the inner and outer walls of the formed film bubble at the die head 4 position, so that the overall cooling rate of the film bubble is consistent, avoiding the problem of uneven packaging bag wall thickness caused by uneven local cooling, and further improving the production yield of clean packaging bags.

[0027] Please see Figure 3 The present invention provides a technical solution: sealing plates 23 are installed at both ends inside the filter tank 2, the sealing plates 23 and the ends of the filter tank 2 form a water storage cavity, a cooling pipe 21 is fixedly connected between the two sealing plates 23, the two ends of the cooling pipe 21 extend into the water storage cavity, and an air inlet 25 and an air outlet 26 are fixedly connected to the outer wall of the filter tank 2 respectively.

[0028] In practice: the sealing plate 23, the filter tank 2, and the cooling pipe 21 enable the cooling and circulation of the coolant. An external circulation pump is used to circulate the coolant, which cools the compressed gas, causing the compressed gas to condense.

[0029] Please see Figure 3 The present invention provides a technical solution: the two ends of the filter tank 2 are respectively connected to the inlet 24 and the outlet 27, and a plurality of alternating wind baffles 22 are fixedly connected inside the filter tank 2, and the plurality of wind baffles 22 are located between two sealing plates 23.

[0030] In practice: the multiple alternating baffles 22 can extend the residence time of compressed gas in the filter tank 2, thereby achieving a better cooling effect, more thoroughly condensing the compressed gas, and thus improving the purity of the compressed gas.

[0031] Please see Figures 2-4 The present invention provides a technical solution: an oil storage chamber 201 is fixedly connected to the outer wall of the filter tank 2, an oil outlet valve 203 is installed on the outer wall of the oil storage chamber 201, and an oil outlet 202 is opened on the inner wall of the filter tank 2, and the oil outlet 202 is connected to the oil storage chamber 201.

[0032] In practice: the oil storage chamber 201 and the oil outlet valve 203 are designed to collect the condensed oil mist in the filter tank 2 and then release it.

[0033] Please see Figures 2-4The present invention provides a technical solution: an air inlet 25 is connected to an air inlet pipe 204, an air outlet 26 is connected to an air outlet pipe 205, an air guide chamber 8 is fixedly connected inside the cold air chamber 11, two air guide plates 81 are fixedly connected to the air guide chamber 8, and the air outlet 71 is located between the two air guide plates 81.

[0034] In practice: the air guide chamber 8 and the air guide plate 81 can guide the compressed gas to the air outlet chamber 71, and then discharge it through the air outlet cavity 73, thereby cooling different areas of the packaging bag and increasing the speed of cooling and forming.

[0035] Please see Figures 5-6 The present invention provides a technical solution: the air guide chamber 8 is trapezoidal and its surface is arc-shaped and fits the cold air cavity 11. The upper and lower bottoms of the air guide chamber 8 are both open structures and are interconnected.

[0036] In specific implementation: The trapezoidal structure can gradually guide and converge the compressed gas, reduce the flow cross-section of the cold air, increase the flow speed of the compressed cold air, and at the same time, allow the cold air to be evenly distributed to the air guide plates 81 on both sides, ensuring that each air outlet chamber 71 can obtain a uniform flow of cold air, so that the cold air can be stably blown out from the air outlet chamber 73 to achieve cooling, avoiding the problem of poor local cooling effect due to uneven flow. Combined with the arc-shaped fitting of the cold air chamber 11, it can reduce the resistance loss during the flow of cold air, and ensure the flow rate and cooling effect of the cold air.

[0037] Please see Figure 2 , Figure 5 The present invention provides a technical solution: the air outlet pipe 205 is connected to the mounting base 5, the mounting base 5 is fixedly connected to the filter element 6, the mold head 4 is provided with an air inlet channel 14, and the air inlet channel 14 is connected to the air outlet pipe 205.

[0038] In practice: the filter element 6 can further filter the compressed gas, thereby removing residual small particles and impurities in the compressed gas, preventing impurities from entering the blown bubble with the compressed gas and contaminating the inner wall of the clean packaging bag, ensuring that the produced packaging bag can meet the clean use requirements; the filtered pure compressed air enters the central area of ​​the die head 4 through the air inlet channel 14, and is used to blow and form the packaging bag bubble, realizing stable blow molding operation.

[0039] Please see Figures 5-6 The present invention provides a technical solution: the mounting base 5 is provided with a cold air pipe 12 that communicates with the cold air chamber 11, and the cold air chamber 11 extends into the mold head 4 and penetrates the mold head 4.

[0040] In specific implementation: the cold air pipe 12 is used to input cold air into the cold air chamber 11, thereby realizing the delivery of cold air, stably providing a cooling air source for the cold air chamber 11, ensuring the stable progress of continuous cooling operation, and avoiding the interruption of cold air delivery affecting the cooling and shaping effect.

[0041] Example 2:

[0042] Please see Figure 8 Based on Embodiment 1, the present invention provides another technical solution: a clamp 13 is fixedly connected between the mounting base 5 and the mold head 4, a forming mold 3 is provided below the mold head 4, a negative pressure mechanism 9 is installed inside the forming mold 3, the negative pressure mechanism 9 includes a motor 91, a rotating plate 92 is fixedly connected to the output end of the motor 91, the rotating plate 92 is rotatably connected inside the forming mold 3, and a vent 93 is provided at the bottom of the forming mold 3, the vent 93 passing through the rotating plate 92.

[0043] In practice: the negative pressure mechanism 9 provides stable negative pressure adsorption force during the blow molding process, stably adsorbing and fixing the inflated packaging bag bubble onto the inner wall of the molding mold 3. With the motor 91 driving the rotating plate 92 to rotate at a uniform speed, the entire packaging bag can rotate at a uniform speed. Combined with the cold air output from the cold air chamber 11, the packaging bag is cooled more evenly, avoiding excessive differences in local cooling rates, and further improving the dimensional accuracy and yield of the finished product. At the same time, the vent 93 can evenly apply the negative pressure suction force to the bottom of the packaging bag, ensuring the stability of the adsorption and fixing, and avoiding uneven adsorption force that could cause the bubble to shift or deform.

[0044] Please see Figure 8 As shown, a negative pressure chamber 10 is provided inside the molding mold 3. The motor 91 is installed inside the negative pressure chamber 10. A piston 94 is slidably connected inside the negative pressure chamber 10. An electric push rod 95 is fixedly connected to the bottom of the molding mold 3. The telescopic end of the electric push rod 95 extends into the negative pressure chamber 10 and is fixedly connected to the piston 94.

[0045] In practice: by activating the electric push rod 95 to drive the piston 94 to move, the movement of the piston 94 allows the gas inside the molding mold 3 to enter the negative pressure chamber 10, thereby making the packaging bag inside the molding mold 3 fit more tightly against the inner wall of the molding mold 3. This ensures that the packaging bag maintains a stable shape during the subsequent cooling and molding process and will not shift due to its own elasticity or the blowing of cold air. At the same time, the negative pressure suction can be adjusted according to the packaging bag of different thicknesses to adapt to different production needs and improve the production adaptability of the equipment.

[0046] Working principle and process: During use, external water is injected into one side of the water storage chamber through the inlet 24, flows through the cooling pipe 21 into the other side of the water storage chamber, and then flows out from the outlet 27, realizing the circulation of coolant. The cooled pipe 21 continuously cools the internal space of the filter tank 2 after cooling. When blow molding is required, compressed gas is introduced into the filter tank 2 through the air inlet 25, meandering between multiple alternating baffles 22 to prolong the residence time and fully contact the cooled pipe 21. The oil mist in the compressed gas condenses upon cooling and accumulates, flowing into the oil storage chamber 201 through the oil outlet 202 for storage. The oil outlet valve 203 can be opened periodically. The collected compressed gas, after cooling and oil removal, flows from the outlet 26 through the outlet pipe 205 into the mounting base 5. After further filtration by the filter element 6 to remove residual impurities, it is divided into two paths. One path enters the central area of ​​the die head 4 through the inlet channel 14 for inflating the packaging bag preform. The other path flows into the cold air chamber 11 through the cold air pipe 12. The cold air is diverted to the two side guide plates 81 under the guidance of the air guide chamber 8, and evenly delivered to each outlet chamber 71. Finally, it is blown out from the two outlet chambers 73 in different directions in the outlet chamber 71, while uniformly cooling the inner and outer walls of the formed film bubble at the die head 4, thereby improving the cooling and shaping rate. After the bubble is inflated into the molding mold 3, the electric push rod 95 is activated to pull the piston 94 to move out of the negative pressure chamber 10, so that the negative pressure chamber 10 and the inside of the molding mold 3 form a negative pressure, which evenly adsorbs the bubble onto the inner wall of the molding mold 3. At the same time, the motor 91 is activated to drive the rotating plate 92 to rotate at a uniform speed, which drives the bubble to rotate at a uniform speed. With the uniform blowing of cold air, the cooling rate of the bubble is consistent throughout, and the blow molding operation of the clean packaging bag is finally completed.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clean packaging bag blow molding equipment, comprising a mounting frame (1), characterized in that, The mounting frame (1) is equipped with a filter tank (2) for cleaning and filtering the gas. The filter tank (2) has sealing plates (23) installed at both ends. The ends of the sealing plates (23) and the filter tank (2) are water storage chambers. A cooling pipe (21) is fixedly connected between the two sealing plates (23). The two ends of the cooling pipe (21) extend into the water storage chamber. An air inlet (25) and an air outlet (26) are fixedly connected to the outer wall of the filter tank (2). An air inlet pipe (204) is connected to the air inlet (25), and an air outlet pipe (205) is connected to the air outlet (26). A mold head (4) is installed at the bottom of the mounting frame (1). An annular cold air chamber (11) is opened inside the mold head (4). An air guide chamber (8) is also fixedly connected inside the cold air chamber (11). The air guide chamber (8) has a trapezoidal structure and its surface is arc-shaped and fits the cold air chamber (11). The top and bottom of the air guide chamber (8) are both open structures and are interconnected. Two air guide plates (81) are also fixedly connected to the air guide chamber (8). Water inlets are connected to both ends of the filter tank (2). The filter tank (2) has an inlet (24) and an outlet (27). Multiple alternating baffles (22) are fixedly connected inside the filter tank (2). The multiple baffles (22) are located between two sealing plates (23). An oil storage chamber (201) is fixedly connected to the outer wall of the filter tank (2). An oil outlet valve (203) is installed on the outer wall of the oil storage chamber (201). An oil outlet (202) is opened on the inner wall of the filter tank (2). The oil outlet (202) is connected to the oil storage chamber (201). The cold air chamber (11) is provided with multiple air guiding mechanisms (7). Each air guiding mechanism (7) includes an air outlet chamber (71). The air outlet chamber (71) is located between two air guiding plates (81). The mold head (4) has an installation cavity. The installation cavity is connected to the cold air chamber (11). The air outlet chamber (71) is installed in the installation cavity. The air outlet chamber (71) has two air outlet chambers (73) in different directions. The air outlet chamber (73) has a square opening (72). A forming mold (3) is provided below the mold head (4), and a negative pressure mechanism (9) is installed inside the forming mold (3).

2. The clean packaging bag blow molding equipment according to claim 1, characterized in that: The air outlet pipe (205) is connected to the mounting base (5), and a filter element (6) is fixedly connected inside the mounting base (5). An air inlet channel (14) is opened inside the mold head (4), and the air inlet channel (14) is connected to the air outlet pipe (205).

3. The clean packaging bag blow molding equipment according to claim 2, characterized in that: The mounting base (5) is provided with a cold air pipe (12) that communicates with the cold air chamber (11). The cold air chamber (11) extends into the mold head (4) and passes through the mold head (4).

4. The clean packaging bag blow molding equipment according to claim 3, characterized in that: A clamp (13) is fixedly connected between the mounting base (5) and the mold head (4). The negative pressure mechanism (9) includes a motor (91). A rotating plate (92) is fixedly connected to the output end of the motor (91). The rotating plate (92) is rotatably connected inside the molding mold (3). A vent (93) is provided at the bottom of the molding mold (3). The vent (93) passes through the rotating plate (92).

5. The clean packaging bag blow molding equipment according to claim 4, characterized in that: A negative pressure chamber (10) is provided inside the molding mold (3). The motor (91) is installed inside the negative pressure chamber (10). A piston (94) is slidably connected inside the negative pressure chamber (10). An electric push rod (95) is fixedly connected to the bottom of the molding mold (3). The telescopic end of the electric push rod (95) extends into the negative pressure chamber (10) and is fixedly connected to the piston (94).

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