A food fresh-keeping packaging bag blown film machine and its method

Abstract

The present invention relates to a film blowing machine for food fresh-keeping packaging bags and a method thereof, and relates to the technical field of plastic molding. The machine comprises a frame, a hot melt system, an air blast system, a bag body deflection system, an A-shaped frame device and two bubble stabilizing frame devices. The A-shaped frame device is installed on the frame and is located above the hot melt system. Each bubble stabilizing frame device is hung on the lower side of the A-shaped frame device. The hot melt system has an annular discharge port. The air blast system is in the middle of the annular discharge port and has an annular air outlet. The bag body deflection system comprises a return air duct, a deflection control device, a plurality of shielding devices and a return air control frame. The deflection control device is deflectably installed on the top of the return air duct. The top of the deflection control device is connected to the inside of the return air duct. The return air control frame is installed on the outside of the return air duct. A plurality of return air holes are arranged around the return air duct. Each shielding device is installed on the deflection control device. The shielding device is transmission-connected to the deflection control device. Each shielding device changes the diameter of the return air hole to prevent the film material from deflecting.

Description

Technical Field

[0001] The invention relates to the technical field of plastic molding, in particular to a film blowing machine for food fresh-keeping packaging bags and a method thereof. Background Art

[0002] Film blowing machine is a device that heats and melts plastic particles and blows them into thin film materials. It is widely used in the production of various plastic packaging materials.

[0003] The film blowing machine is mainly composed of an extruder main machine, a traction auxiliary machine, an air ring, an air compressor and a distribution box. The extruder main machine includes a motor, a gear reducer, a screw, a barrel and a die head, etc., which are responsible for heating and melting the plastic particles and extruding them through the die head; the traction auxiliary machine includes a traction frame, a herringbone splint, a traction roller, etc., which are responsible for stretching the extruded tubular film ring and rolling it into a film cylinder; the air ring consists of two parts, the upper and lower parts, and the fan blows the cold air evenly to the die outlet to cool the tubular film; the air compressor: provides compressed air to help the film material reach the required width; the distribution box: controls the operation and heating of the entire unit.

[0004] Existing film blowing machines are prone to problems such as uneven film thickness. During the cooling process, the solidification time will deviate. In addition, the air is always blowing, so the film may deviate. The deflection of the film will cause uneven film thickness and even wrinkles and ruptures. Summary of the invention

[0005] In order to overcome the technical defects of the prior art, the present invention provides a film blowing machine and method for food fresh-keeping packaging bags to prevent film material from deflecting.

[0006] The technical solution adopted by the present invention is:

[0007] A film blowing machine for food fresh-keeping packaging bags comprises a frame, a hot melt system, an air blast system, a bag body deflection system, an A-frame device and two bubble stabilizing frame devices, wherein the hot melt system and the air blast system are both mounted on the frame, the A-frame device is mounted on the frame and is located above the hot melt system, each of the bubble stabilizing frame devices is hung on the lower side of the A-frame device, the hot melt system has an annular discharge port, the air blast system is in the middle of the annular discharge port and the air blast system has an annular air outlet, the bag body deflection system comprises a return air duct, a deflection control device, a plurality of shielding devices and a return air control frame, the deflection control device is rotatably mounted on the top of the return air duct, the top of the deflection control device is connected to the inside of the return air duct, the return air control frame is mounted on the outside of the return air duct, a plurality of vertically arranged return air holes are arranged around the return air duct, each of the shielding devices is mounted on the deflection control device, the shielding device is transmission-connected to the deflection control device, and each of the shielding devices changes the diameter of the return air hole.

[0008] Preferably, the air blowing system includes a plurality of air blowers, and each of the air blowers is connected to the annular air outlet through an air blowing pipe.

[0009] Preferably, the herringbone device comprises a first bracket and a second bracket, the first bracket and the second bracket are both rotatably mounted on the frame, and a plurality of transverse merging rollers are rotatably provided on the first bracket and the second bracket.

[0010] Preferably, each of the bubble stabilizing rack devices comprises an upper merging rod, a lower merging rod, two clamping springs, two clamping connecting rods and a plurality of forward and backward merging rollers, the upper merging rod is mounted on the upper end of the clamping connecting rod, each of the forward and backward merging rollers is rotatably mounted on the lower end of the lower merging rod, the lower merging rod is slidably mounted on the clamping connecting rod, the two ends of the clamping spring are respectively pressed against the lower merging rod and the forward and backward merging rollers, and the upper merging rod and the lower merging rod are clamped on the bottom of the herringbone device.

[0011] Preferably, a deflection arc groove is provided on the top of the return air duct, the deflection control device is slidably connected to the deflection arc groove, the center of gravity of the deflection control device is lower than the deflection arc groove, and the deflection control device is provided with a return air top hole connected to the return air duct.

[0012] Preferably, the shielding device includes a shielding strip and a hook plate, the hook plate is installed at the bottom of the shielding strip, the hook plate hooks the deflection control device, the shielding strip fits the return air duct and slides up and down along the preset slot of the return air duct, and the shielding strip is an iron sheet with a counterweight installed at the bottom.

[0013] Preferably, the return air control frame includes a plurality of negative pressure vertical plates and a plurality of negative pressure horizontal plates, each of the negative pressure vertical plates is installed on the outer side wall of the return air duct, each of the negative pressure horizontal plates is installed between the upper ends and lower ends of adjacent negative pressure vertical plates, and each of the return air holes is located between the corresponding negative pressure vertical plates.

[0014] A film blowing method for a food fresh-keeping packaging bag, using a film blowing machine for a food fresh-keeping packaging bag, comprises the following steps:

[0015] S1: The material is squeezed out from the outlet to 10 cm. When it is in a molten state, it is pressed against the return air duct and the air blowing system is activated to allow the annular air outlet to release air, causing the material to expand.

[0016] S2: The materials are sequentially placed outside the bag body deflection system upwards, and are sequentially pulled between two bubble stabilizing rack devices and onto the herringbone rack device;

[0017] S3: The blowing system continues to blow air. Due to the deflection of the bag body, the air flow velocity around the deflection control device is uneven, which in turn drives the deflection control device to deflect, causing the air flow of each return air hole to change, thereby attracting the bag body to correct its posture.

[0018] The beneficial effects of the present invention are:

[0019] The hot melt system and the blast system are both installed on the frame. The hot melt system is used to produce molten material and extrude it from the discharge port. The herringbone frame device is installed on the frame and located above the hot melt system. Each bubble stabilizing frame device is hung on the lower side of the herringbone frame device. The bubble stabilizing frame and the herringbone frame are used to flatten the blown film material for easy winding. The hot melt system has an annular discharge port. The blast system is in the middle of the annular discharge port and the blast system has an annular air outlet. The air from the annular air outlet blows into the annular discharge port, thereby expanding the material extruded from the annular discharge port. The bag body deflection system includes a return air duct, a deflection control device, a plurality of shielding devices and a return air control frame. The deflection control device can be deflected and installed on the top of the return air duct. The top of the deflection control device is connected to the inside of the return air duct. The return air control frame is installed on the outside of the return air duct, and a number of vertically arranged return air holes are provided around the return air duct. Each shielding device is installed on the deflection control device, and the shielding device is transmission-connected to the deflection control device. Each shielding device changes the diameter of the return air hole, thereby correcting the deflection of the film material and preventing deflection. Since the annular air outlet always discharges air, after the film material is deflected, the air flow velocity on the side where the deflection control device is closer to the film material is faster, and the air flow pushes the side where the deflection control device is closer to the film material to deflect upward, thereby driving the corresponding shielding device to rise, reducing the diameter of the corresponding return air holes, reducing the flow rate of hot air returning through the corresponding return air holes on this side, and increasing the air pressure on this side, thereby pushing the film material to deflect to the right, and automatically correcting the direction of the film material.

[0020] Since it is necessary to prevent the shielding device on the side where the deflection control device is lowered from falling and affecting the opening of the return air hole, the shielding device is installed by hanging it on the deflection control device, and the return air control frame has an annular step to support the shielding device. The annular step allows each shielding device to have a maximum opening of the corresponding return air hole when placed on the annular step, until the deflection control device deflects upward to drive the shielding device upward and reduce the opening of the corresponding return air hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0023] Figure 3 for Figure 1 Enlarged schematic diagram of point B in the middle.

[0024] Figure 4 It is a schematic cross-sectional view of the bag body deflection system structure.

[0025] Figure 5 for Figure 4 Enlarged schematic diagram at point C in the middle.

[0026] Figure 6 Schematic diagram of the structure of the bag body skew system

[0027] Figure 7 is Figure 6 Enlarged schematic diagram at position D in

[0028] Figure 8 Transverse sectional view schematic diagram of the bag body skew system

[0029] Explanation of reference numerals in the drawings:

[0030] 1. Frame; 11. Ring-shaped air outlet; 12. Ring-shaped discharge port;

[0031] 2. Hot melt system;

[0032] 3. Blowing system;

[0033] 4. Bag body skew system; 41. Return air pipe; 411. Return air hole; 412. Deflection arc groove; 42. Skew control device; 421. Return air top hole; 43. Shielding device; 431. Shielding strip; 432. Hooking plate; 44. Return air control frame; 441. Negative pressure vertical plate; 442. Negative pressure horizontal plate;

[0034] 5. Herringbone frame device; 51. First support; 52. Second support; 53. Horizontal merging roller;

[0035] 6. Foam stabilizing frame device; 61. Upper merging rod; 62. Lower merging rod; 63. Clamping spring; 64. Clamping connecting rod; 65. Front-back merging roller;

[0036] 7. Film material. Specific implementation mode

[0037] The present invention will be further described below with reference to the accompanying drawings:

[0038] As Figure 1 and Figure 8As shown, the present embodiment provides a food fresh-keeping packaging bag film blowing machine, including a frame 1, a hot melt system 2, an air blast system 3, a bag body deflection system 4, an A-shaped frame device 5 and two bubble stabilizing frame devices 6, the hot melt system 2 and the air blast system 3 are both installed on the frame 1, the hot melt system 2 is used to produce molten material and extrude it from the discharge port, the A-shaped frame device 5 is installed on the frame 1 and is located above the hot melt system 2, each bubble stabilizing frame device 6 is hung on the lower side of the A-shaped frame device 5, the bubble stabilizing frame device 6 and the A-shaped frame device 5 are used to squeeze the blown film material 7 to facilitate winding, the hot melt system 2 has an annular discharge port 12, the air blast system 3 is in the middle of the annular discharge port 12 and the air blast system 3 has an annular air outlet 11, that is, the annular air outlet 11 The outlet air blows toward the annular discharge port 12, thereby expanding the material squeezed out of the annular discharge port 12. The bag body deflection system 4 includes a return air duct 41, a deflection control device 42, a plurality of shielding devices 43 and a return air control frame 44. The deflection control device 42 is rotatably installed on the top of the return air duct 41. The top of the deflection control device 42 is connected to the inside of the return air duct 41. The return air control frame 44 is installed on the outside of the return air duct 41. A plurality of vertically arranged return air holes 411 are provided around the return air duct 41. Each shielding device 43 is installed on the deflection control device 42. The shielding device 43 is transmission-connected to the deflection control device 42. Each shielding device 43 changes the diameter of the return air hole 411, thereby correcting the deflection of the membrane material 7 to prevent deflection.

[0039] Since the annular air outlet 11 always blows out air, after the film material 7 is deflected, the airflow velocity on the side where the deflection control device 42 is closer to the film material 7 is faster, and the airflow pushes the side where the deflection control device 42 is closer to the film material 7 to deflect upward (such as Figure 4 The deflection control device 42 shown in the figure deflects upward on the right side), thereby driving the corresponding shielding device 43 to rise, reducing the diameter of the corresponding return air holes 411, so that the side (that is, Figure 4 The hot air flow rate of the return air hole 411 on the right side is reduced, so that the hot air flow rate of the return air hole 411 on the right side is reduced. Figure 4 The air pressure on the right side increases, pushing the film material 7 to deflect to the right, automatically correcting the direction of the film material 7.

[0040] Please note that since it is necessary to prevent the shielding device 43 on the side where the deflection control device 42 descends from falling and affecting the opening of the return air hole 411, the shielding device 43 is installed by hanging on the deflection control device 42, and the return air control frame 44 has an annular step for supporting the shielding device 43. The annular step enables each shielding device 43 to have a maximum opening of the corresponding return air hole 411 when placed on the annular step, until the deflection control device 42 deflects upward to drive the shielding device 43 upward and reduce the opening of the corresponding return air hole 411.

[0041] Specifically, the air blowing system 3 includes a number of blowers. Each blower is connected to the annular air outlet 11 through an air blowing pipe, and then expands and forms the annular material extruded from the annular discharge port 12.

[0042] Specifically, the herringbone frame device 5 includes a first bracket 51 and a second bracket 52. The first bracket 51 and the second bracket 52 are rotatably installed on the frame 1. A number of transverse merging rollers 53 are rotatably provided on the first bracket 51 and the second bracket 52, which is convenient for squeezing the film material 7 flat.

[0043] Specifically, each foam stabilizing frame device 6 includes a merging upper rod 61, a merging lower rod 62, two clamping springs 63, two clamping connecting rods 64 and a number of front-to-back merging rollers 65. The merging upper rod 61 is installed at the upper end of the clamping connecting rod 64. Each front-to-back merging roller 65 is rotatably installed at the lower end of the merging lower rod 62. The merging lower rod 62 is slidably installed on the clamping connecting rod 64. The two ends of the clamping spring 63 respectively press on the front-to-back merging rollers 65 of the merging lower rod 62, and then fix the merging upper rod 61 and the merging lower rod 62 at the lower side position of the herringbone frame device 5.

[0044] Specifically, a deflection arc groove 412 is provided at the top of the return air pipe 41. The skew control device 42 is slidably connected to the deflection arc groove 412. The center of gravity of the skew control device 42 is lower than that of the deflection arc groove 412 to maintain stability. A return air top hole 421 communicating with the return air pipe 41 is provided on the skew control device 42, so that the air flow above the skew control device 42 can be absorbed, which is convenient for winding the film material 7.

[0045] Specifically, the shielding device 43 includes a shielding strip 431 and a hook plate 432. The hook plate 432 is installed at the top of the shielding strip 431. The hook plate 432 hooks the skew control device 42. The shielding strip 431 fits on the return air pipe 41 and slides up and down along the preset slot of the return air pipe 41. The shielding strip 431 is an iron sheet with a counterweight installed at the bottom. The counterweight is used to pull the shielding strip 431 to fall under the action of gravity until it resets on the annular step, and then the shielding strip 431 controls the opening degree of each return air hole 411. A number of through holes adapted to the corresponding return air holes 411 are provided on the shielding strip 431.

[0046] Specifically, the return air control frame 44 includes a number of negative pressure vertical plates 441 and a number of negative pressure horizontal plates 442. Each negative pressure vertical plate 441 is installed on the outer side wall of the return air pipe 41. Each negative pressure horizontal plate 442 is installed between the upper ends and the lower ends of adjacent negative pressure vertical plates 441. Each return air hole 411 is located between the corresponding negative pressure vertical plates 441. Each negative pressure horizontal plate 442 and the negative pressure vertical plate 441 surround the outer periphery of the return air hole 411, so that the air flow return speed of the return air hole 411 acts more directly on the film material 7, which is convenient for generating negative pressure to control the running direction of the film material 7.

[0047] A method for blowing film of food fresh-keeping packaging bags, using a food fresh-keeping packaging bag blowing film machine, includes the following steps:

[0048] S1: Extrude the material from the discharge port to 10 cm. When in a molten state, pinch it on the return air duct 41 and activate the air blowing system 3 to make the annular air outlet 11 emit air, causing the material to expand;

[0049] S2: Sequentially sleeved the material upward outside the bag body deflection system 4, and sequentially pulled it between the two bubble stabilizing frame devices 6 and onto the chevron frame device 5;

[0050] S3: The air blowing system 3 continues to blow air. Due to the deflection of the bag body, the air flow velocity at each part around the deflection control device 42 is uneven, which drives the deflection of the deflection control device 42, changing the air flow of each return air hole 411, and then attracting the bag body to correct its posture.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A food fresh-keeping packaging bag blown film machine, characterized in that, The invention comprises a frame, a hot melt system, an air blast system, a bag body deflection system, an A-shaped frame device and two bubble stabilizing frame devices, wherein the hot melt system and the air blast system are both installed on the frame, the A-shaped frame device is installed on the frame and is located above the hot melt system, and each bubble stabilizing frame device is hung on the lower side of the A-shaped frame device, the hot melt system has an annular discharge port, the air blast system is in the middle of the annular discharge port and the air blast system has an annular air outlet, the bag body deflection system comprises a return air duct, a deflection control device, a plurality of shielding devices and a return air control frame, the deflection control device can be deflected and installed on the top of the return air duct, the The top of the deflection control device is connected to the interior of the return air duct, and the return air control frame is installed on the outside of the return air duct. A number of vertically arranged return air holes are provided around the return air duct. Each of the shielding devices is installed on the deflection control device. The shielding device is transmission-connected to the deflection control device. Each of the shielding devices changes the diameter of the return air hole. The shielding device includes a shielding strip and a hook plate. The hook plate is installed on the top of the shielding strip. The hook plate hooks the deflection control device. The shielding strip fits the return air duct and slides up and down along the preset slot of the return air duct. The shielding strip is an iron sheet with a counterweight installed at the bottom.

2. The blown film machine for a food fresh-keeping packaging bag according to claim 1, wherein, The air blowing system includes a plurality of air blowers, and each of the air blowers is connected to the annular air outlet through an air blowing pipe.

3. The blown film machine for a food fresh-keeping packaging bag according to claim 1, wherein, The herringbone device comprises a first bracket and a second bracket, wherein the first bracket and the second bracket are both rotatably mounted on the frame, and a plurality of transverse merging rollers are rotatably provided on the first bracket and the second bracket.

4. A food fresh-keeping packaging bag blown film machine according to claim 1, characterized in that, Each of the bubble stabilizing rack devices includes an upper merging rod, a lower merging rod, two clamping springs, two clamping connecting rods and a plurality of forward and backward merging rollers. The upper merging rod is installed on the upper end of the clamping connecting rod, and each of the forward and backward merging rollers is rotatably installed on the lower end of the merging lower rod. The merging lower rod is slidably installed on the clamping connecting rod. The two ends of the clamping spring are respectively pressed on the merging lower rod and the forward and backward merging rollers. The upper merging rod and the merging lower rod are clamped at the bottom of the herringbone frame device.

5. A food fresh-keeping packaging bag blown film machine according to claim 1, characterized in that, A deflection arc groove is provided on the top of the return air duct, and the deflection control device is slidably connected to the deflection arc groove. The center of gravity of the deflection control device is lower than the deflection arc groove, and the deflection control device is provided with a return air top hole connected to the return air duct.

6. The blown film machine for a food fresh-keeping packaging bag according to claim 1, wherein, The return air control frame includes a plurality of negative pressure vertical plates and a plurality of negative pressure horizontal plates, each of the negative pressure vertical plates is installed on the outer side wall of the return air duct, each of the negative pressure horizontal plates is installed between the upper ends and lower ends of adjacent negative pressure vertical plates, and each of the return air holes is located between the corresponding negative pressure vertical plates.

7. Method for blowing film of food fresh-keeping packaging bag, using the food fresh-keeping packaging bag blowing machine as described in claim 1, characterized in that, The steps include: S1: The material is squeezed out from the outlet to 10 cm. When it is in a molten state, it is pressed against the return air duct and the air blowing system is activated to allow the annular air outlet to release air, causing the material to expand. S2: The materials are sequentially placed outside the bag body deflection system upwards, and are sequentially pulled between two bubble stabilizing rack devices and onto the herringbone rack device; S3: The blowing system continues to blow air. Due to the deflection of the bag body, the air flow velocity around the deflection control device is uneven, which in turn drives the deflection control device to deflect, causing the air flow of each return air hole to change, thereby attracting the bag body to correct its posture.

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