Anti-pinch film blowing machine

Abstract

The utility model relates to an anti-pinch film blowing machine. The anti-pinch film blowing machine comprises a machine base, a blanking hopper, an extrusion mechanism, a die head, an air ring, a herringbone plate, a traction mechanism and a winding mechanism, the traction mechanism comprises a traction mounting seat, a traction motor, a driving traction roller and a driven traction roller; the winding mechanism comprises a winding mounting seat, a driving winding roller, a driven winding roller and a winding motor; the device is characterized in that a driven traction roller is rotatably mounted on a first sliding seat, a traction mounting seat is provided with a first horizontal sliding groove, the first sliding seat is slidably arranged in the first horizontal sliding groove, the traction mounting seat is in threaded connection with a first adjusting bolt, and the first adjusting bolt is sleeved with a first spring; a first proximity switch is mounted on the traction mounting seat and transmits a signal for sensing approaching of the driven traction roller to a control center, and the control center controls the extrusion mechanism, the winding motor and the traction motor to stop working. The anti-pinch film blowing machine can obviously reduce the occurrence probability of safety accidents.

Description

Technical Field

[0001] The utility model relates to a film blowing machine. Background Art

[0002] In the plastic processing industry, as an important production equipment, the film blowing machine is widely used in the production process of thermoplastic material films such as polyethylene (PE) and polypropylene (PP). The film blowing machine heats and melts plastic particles, and uses a screw extruder to extrude the molten plastic into a tubular film blank. Subsequently, the film blank is transversely expanded through a blowing device to form a film. In this process, the traction mechanism, as a key component of the film blowing machine, is responsible for continuously and smoothly pulling out the cooled and solidified film, and winding it into a cylindrical finished product through a winding device. The existing traction mechanisms of film blowing machines generally adopt a structural design that combines an active traction roller and a passive traction roller. The active traction roller is usually driven by a motor to provide the power required for pulling the film; while the passive traction roller rotates by relying on the friction with the active traction roller and the tension of the film to assist the film traction process. This structural design can meet the basic requirements of film production to a certain extent, but its fixed characteristics also bring significant limitations. Since both the active traction roller and the passive traction roller are fixedly installed on the film blowing machine frame, they cannot be adjusted in position or respond dynamically according to the actual situation during the production process. This design defect is particularly prominent when facing sudden situations such as film breakage or finger jamming. When the film breaks during the production process, the traditional traction mechanism cannot detect and react in time, which may cause the broken film to accumulate in the traction mechanism, thereby affecting the normal operation of the entire production line. Similarly, if an operator accidentally gets their hand or other objects caught in the traction mechanism during operation, it is difficult to detect due to the fixed traction roller and cannot achieve an emergency stop, thus increasing the risk of safety accidents. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the utility model innovatively provides an anti-pinch film blowing machine that can ensure continuous and smooth traction of the film while detecting abnormal situations such as film breakage or finger jamming.

[0004] This pinch-proof blown film machine includes a machine base, a feeding hopper, an extrusion mechanism, a die head, an air ring, a chevron plate, a traction mechanism and a winding mechanism; the traction mechanism includes a traction mounting seat, a traction motor, a driving traction roller and a driven traction roller, the traction mounting seat is installed on the machine base, the traction motor, the driving traction roller and the driven traction roller are installed on the traction mounting seat, and the driving traction roller is in transmission connection with the traction motor; the winding mechanism includes a winding mounting seat, a driving winding roller, a driven winding roller and a winding motor, the driving winding roller, the driven winding roller and the winding motor are installed on the winding mounting seat, and the driving winding roller is in transmission connection with the winding motor; it is characterized in that: the driven traction roller is rotatably installed on a first sliding seat, a first horizontal chute is provided on the traction mounting seat, the first sliding seat is slidably arranged in the first horizontal chute, a first adjusting bolt is threadedly connected to the traction mounting seat, a first spring is sleeved on the first adjusting bolt, the first spring acts on the first sliding seat and makes the driven traction roller close to the driving traction roller; a first proximity switch is installed on the traction mounting seat, the first proximity switch can sense the approach of the driven traction roller, the first proximity switch can transmit a signal to the control center, and the control center can control the extrusion mechanism, the winding motor and the traction motor to stop working.

[0005] The driven winding roller is rotatably installed on a second sliding seat, a second horizontal chute is provided on the winding mounting seat, the second sliding seat is slidably arranged in the second horizontal chute, a second adjusting bolt is threadedly connected to the winding mounting seat, a second spring is sleeved on the second adjusting bolt, the second spring acts on the second sliding seat and makes the driven winding roller close to the driving winding roller; a second proximity switch is installed on the winding mounting seat, the second proximity switch can sense the approach of the driven winding roller, and the second proximity switch can transmit a signal to the control center.

[0006] An inclined upwardly extending support rod is installed on the winding mounting seat, the support rod is used for placing a winding shaft, and the winding shaft leans towards the driving winding roller.

[0007] A mica heat insulation sheet is provided between the die head and the air ring.

[0008] A heat-sealing film cutting mechanism is provided between the traction mechanism and the winding mechanism, the heat-sealing film cutting mechanism includes a film cutting knife and a film cutting knife seat, the film cutting knife is installed on the film cutting knife seat, and the film cutting knife can be electrically heated.

[0009] The film cutting knife is in an arc-shaped strip shape, both ends of the film cutting knife have adjusting long holes, fixing bolts are arranged in the adjusting long holes, and the fixing bolts are threadedly connected to the film cutting knife seat.

[0010] A material shortage proximity switch is provided in the feeding hopper, the material shortage proximity switch can transmit a signal to the control center, and the control center can control the alarm to emit an alarm sound.

[0011] The die head is connected to an air pump through an air inlet pipe; the die head is connected to a vacuum pump through an exhaust pipe.

[0012] According to an anti-pinch blown film machine provided by the present invention, it can not only improve the production efficiency and product quality of the blown film machine, but also significantly reduce the occurrence probability of safety accidents and ensure the safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the present invention;

[0014] Figure 2 It is the structural schematic diagram of the traction mechanism;

[0015] Figure 3 It is the structural schematic diagram of the heat-sealing film cutting mechanism;

[0016] Figure 4 It is the structural schematic diagram of the winding mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] As Figure 1 shown, this anti-pinch blown film machine includes a machine base 1, a feeding hopper 2, an extrusion mechanism 3, a die head 4, an air ring 9, a chevron plate 5, a traction mechanism 6 and a winding mechanism 7. Dry polyethylene particles (or other plastic raw materials) are added into the feeding hopper 2 of the blown film machine; the plastic particles enter the extrusion mechanism 3 by their own weight. The extrusion mechanism 3 pushes the plastic particles forward. During the pushing process, due to the friction between the plastic and the screw, the plastic and the barrel, as well as the collision and friction between the particles, and at the same time with the heating outside the barrel, the plastic particles gradually melt. The molten plastic is extruded from the die orifice of the die head 4 to form a tubular film blank. The air compressor compresses the air and transports it into the blown film die head, and high-pressure air is blown out through the die head 4 to blow up the tubular film blank into a film with the required width. The blown film is cooled by the air ring 9. After the cooled film is further cooled and shrunk by the chevron plate 5, it is pulled by the traction mechanism 6, and finally wound into a roll by the winding mechanism 7 to complete the production of the film.

[0018] As Figure 2 shown, the traction mechanism 6 includes a traction mounting base 60, a traction motor (not shown), a driving traction roller 67 and a driven traction roller 61. The traction mounting base 60 is installed on the machine base 1, and the traction motor, the driving traction roller 67 and the driven traction roller 61 are installed on the traction mounting base 60. The driving traction roller 67 is in transmission connection with the traction motor. Driven by the traction motor, the driving traction roller 67 rotates, and the film is clamped between the driving traction roller 67 and the driven traction roller 61 and is pulled. In order to solve the problems existing in the prior art, as Figure 2As shown, the passive traction roller 61 is rotatably mounted on the first sliding seat 62, the traction mounting seat 60 is provided with a first horizontal slide groove 66, the first sliding seat 62 is slidably arranged in the first horizontal slide groove 66, the traction mounting seat 60 is threadedly connected with a first adjusting bolt 63, the first adjusting bolt 63 is sleeved with a first spring 64, the first spring 64 acts on the first sliding seat 62 and makes the passive traction roller 61 close to the active traction roller 67, through this structure, when a hand or other objects are clamped between the active traction roller 67 and the passive traction roller 61, the passive traction roller 61 can move and separate from the active traction roller 67, so that it can play a protective role; in order to further improve the safety and at the same time determine whether the film is broken, a first proximity switch 65 is installed on the traction mounting seat 60, the first proximity switch 65 can sense the passive traction roller 61 approaching, the first proximity switch 65 can transmit a signal to the control center 10, and the control center 10 can control the extrusion mechanism 3, the winding motor and the traction motor to stop working. When film breakage occurs, the passive traction roller 61 will also move slightly (because no film is clamped between the active traction roller 67 and the passive traction roller 61), so the first proximity switch 65 can detect it, and the extrusion mechanism 3, the winding motor and the traction motor can be controlled to stop working through the control center 10; of course, when objects or hands are clamped, the first proximity switch 65 can also detect it, and the extrusion mechanism 3, the winding motor and the traction motor can be controlled to stop working through the control center 10, thereby playing a protective role.

[0019] like Figure 4 As shown, the winding mechanism 7 includes a winding mounting seat 70, an active winding roller 72, a passive winding roller 71 and a winding motor. The active winding roller 72, the passive winding roller 71 and the winding motor are mounted on the winding mounting seat 70, and the active winding roller 72 is connected to the winding motor by transmission. The passive winding roller 71 is rotatably mounted on the second sliding seat, the winding mounting seat 70 is provided with a second horizontal slide groove, the second sliding seat is slidably arranged in the second horizontal slide groove, the winding mounting seat 70 is threadedly connected with a second adjusting bolt, the second adjusting bolt is sleeved with a second spring, the second spring acts on the second sliding seat and brings the passive winding roller 71 and the active winding roller 72 close to each other; the winding mounting seat 70 is provided with a second proximity switch 75, the second proximity switch 75 can sense the passive winding roller 71 close to each other, and the second proximity switch 75 can transmit a signal to the control center 10. The working principle of the winding mechanism 7 is the same as that of the traction mechanism 6, which will not be repeated here.

[0020] In order to facilitate the winding and placement of the winding shaft 73, Figure 4As shown in the figure, a support rod 74 extending obliquely upward is installed on the winding mounting base 70. The winding shaft 73 is placed on the support rod 74, and the winding shaft 73 leans towards the active winding roller 72. Since the support rod 74 is oblique, when the winding shaft 73 is placed on the support rod 74, it automatically leans towards the active winding roller 72 due to gravity. The rotation of the active winding roller 72 drives the rotation of the winding shaft 73, and thus the winding shaft 73 performs winding.

[0021] To prevent the heat of the die head 4 from being transferred to the air ring 9, a mica heat insulation sheet is provided between the die head 4 and the air ring 9. The mica heat insulation sheet plays a role in heat insulation.

[0022] Some films are relatively wide, and some customers need to divide the film into two. For this reason, a heat-sealing film cutting mechanism 8 is provided between the traction mechanism 6 and the winding mechanism 7, as Figure 3 shown. The heat-sealing film cutting mechanism 8 includes a film cutting knife 81 and a film cutting knife seat 80. The film cutting knife 81 is installed on the film cutting knife seat 80. Of course, the film cutting knife 81 can be electrically heated. When the film is pulled down by the winding mechanism 7, the film cutting knife 81 divides the film into two, and at the same time heat-seals the cut edge of the film.

[0023] As Figure 3 shown, the film cutting knife 81 is in an arc-shaped strip shape. Both ends of the film cutting knife 81 have adjusting long holes 810. Fixing bolts 82 are provided in the adjusting long holes 810, and the fixing bolts 82 are threadedly connected to the film cutting knife seat 80. With this structure, the front and rear positions of the film cutting knife 81 can be conveniently adjusted.

[0024] A material shortage proximity switch is provided in the feeding hopper 2. When the material shortage proximity switch in the feeding hopper 2 detects that the material has dropped to the detection position, the material shortage proximity switch transmits a signal to the control center 10, and the control center 10 controls the alarm to emit an alarm sound to remind of feeding.

[0025] Finally, it is worth mentioning that the die head 4 is connected to an air pump through an air inlet pipe (not shown). When the die head 4 needs to discharge film material, the air pump provides air source to the die head 4 through the air inlet pipe, so as to inflate the film; however, the air pump cannot control the inflation amount, which may cause excessive inflation in some cases. At this time, holes need to be punched in the film for exhaust, which will cause damage to the film. To solve this problem, the die head 4 is connected to a vacuum pump through an exhaust pipe (not shown). When the film is over-inflated, the vacuum pump evacuates the die head 4 through the exhaust pipe to reduce the inflation amount of the film, so that the inflation amount that meets the requirements can be achieved, and there is no need to punch holes in the film, thus ensuring the quality of the film.

Claims

1. An anti-pinch blown film machine, comprising a machine base (1), a feeding hopper (2), an extrusion mechanism (3), a die head (4), an air ring (9), a chevron plate (5), a traction mechanism (6) and a winding mechanism (7); the traction mechanism (6) includes a traction mounting seat (60), a traction motor, a driving traction roller (67) and a driven traction roller (61), the traction mounting seat (60) is mounted on the machine base (1), the traction motor, the driving traction roller (67) and the driven traction roller (61) are mounted on the traction mounting seat (60), and the driving traction roller (67) is in driving connection with the traction motor; the winding mechanism (7) includes a winding mounting seat (70), a driving winding roller (72), a driven winding roller (71) and a winding motor, the driving winding roller (72), the driven winding roller (71) and the winding motor are mounted on the winding mounting seat (70), and the driving winding roller (72) is in driving connection with the winding motor; characterized in that: The passive traction roller (61) is rotatably mounted on the first sliding seat (62). A first horizontal chute (66) is provided on the traction mounting seat (60). The first sliding seat (62) is slidably disposed within the first horizontal chute (66). A first adjusting bolt (63) is threadedly connected to the traction mounting seat (60). A first spring (64) is sleeved on the first adjusting bolt (63). The first spring (64) acts on the first sliding seat (62) to bring the passive traction roller (61) closer to the active traction roller (67). A first proximity switch (65) is mounted on the traction mounting seat (60). The first proximity switch (65) can sense the approach of the passive traction roller (61). The first proximity switch (65) can transmit a signal to the control center (10), and the control center (10) can control the extrusion mechanism (3), the winding motor, and the traction motor to stop working.

2. The air-blowing film blowing machine with anti-pinch function according to claim 1, characterized in that: The passive winding roller (71) is rotatably mounted on the second sliding seat. A second horizontal chute is provided on the winding mounting seat (70). The second sliding seat is slidably disposed within the second horizontal chute. A second adjusting bolt is threadedly connected to the winding mounting seat (70). A second spring is sleeved on the second adjusting bolt. The second spring acts on the second sliding seat to bring the passive winding roller (71) closer to the active winding roller (72). A second proximity switch (75) is mounted on the winding mounting seat (70). The second proximity switch (75) can sense the approach of the passive winding roller (71). The second proximity switch (75) can transmit a signal to the control center (10).

3. The blowing film machine with anti-pinch function according to claim 1, wherein: A support rod (74) extending obliquely upward is mounted on the winding mounting seat (70). The support rod (74) is used to place the winding shaft (73), and the winding shaft (73) leans towards the active winding roller (72).

4. The anti-pinch blown film machine according to claim 1, characterized in that: A mica heat insulation sheet is provided between the die head (4) and the air ring (9).

5. The anti-pinch blown film machine according to claim 1, wherein: A heat-sealing film cutting mechanism (8) is provided between the traction mechanism (6) and the winding mechanism (7). The heat-sealing film cutting mechanism (8) includes a film cutting knife (81) and a film cutting knife seat (80). The film cutting knife (81) is mounted on the film cutting knife seat (80), and the film cutting knife (81) can be electrically heated.

6. The anti-pinch blown film machine according to claim 5, wherein: The film cutting knife (81) is in an arc-shaped strip shape. Both ends of the film cutting knife (81) have adjusting long holes (810). Fixing bolts (82) are provided within the adjusting long holes (810), and the fixing bolts (82) are threadedly connected to the film cutting knife seat (80).

7. The anti-pinch blown film machine according to claim 1, characterized in that: A material shortage proximity switch is provided within the hopper (2). The material shortage proximity switch can transmit a signal to the control center (10), and the control center (10) can control the alarm to emit an alarm sound.

8. The anti-pinch blown film machine according to claim 1, characterized in that: The die head (4) is connected to an air pump through an air inlet pipe; the die head (4) is connected to a vacuum pump through an exhaust pipe.

Images