Film feeding and cutting device

Abstract

The utility model relates to the technical field of film packaging machines, and discloses a film feeding and cutting device which comprises a negative pressure adsorption unit, a film pressing unit, a film cutting driving unit, a film feeding driving unit and a rack, a film cutting tool is rotatably installed on the rack, and a film cutting driven synchronizing wheel is connected with the film cutting tool. The film cutting driven synchronous wheel is connected with the film cutting driving synchronous wheel through a film cutting synchronous belt, the film cutting driving synchronous wheel is installed on the film cutting motor, the film cutting motor is installed on the machine frame, the film feeding driving unit is installed at one end of the machine frame, the negative pressure adsorption unit is installed at the other end of the machine frame, and a conveying belt with holes of the negative pressure adsorption unit is connected with the film feeding driving unit. The film pressing unit is installed on the machine frame and matched with the film feeding driving unit. According to the automatic film feeding device, automatic film feeding and automatic film cutting are achieved, the technical problem that the film cutting length is prone to occurring is solved, the stopping position of the cutter is accurately guaranteed, and the phenomenon of film cutting length and interference to the film feeding process are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of film packaging machines, in particular to a film feeding and cutting device. Background Art

[0002] Manually measuring the length of packaging film and then cutting it is labor-intensive and inefficient. Film packaging machines, however, require a constant supply of film of a fixed length for the packaged items, a task performed by a film feeding and cutting device. If a film feeding and cutting device were used for both film feeding and cutting, the cutter in the existing film feeding and cutting device, driven by a clutch, is difficult to accurately position, resulting in film cuts that are too short and interfere with the film feeding process. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the above prior art and to provide a film feeding and cutting device.

[0004] The purpose of the utility model is achieved through the following technical solutions: a film feeding and cutting device includes a negative pressure adsorption unit, a film pressing unit, a film cutting drive unit, a film feeding drive unit and a frame, the film cutting drive unit includes a film cutting motor, a film cutting drive synchronous wheel, a film cutting synchronous belt, a film cutting driven synchronous wheel and a film cutting tool, the film cutting tool is rotatably mounted on the frame, the film cutting driven synchronous wheel is connected to the film cutting tool, the film cutting driven synchronous wheel is connected to the film cutting drive synchronous wheel through the film cutting synchronous belt, the film cutting drive synchronous wheel is mounted on the film cutting motor, the film cutting motor is mounted on the frame, the film feeding drive unit is mounted on one end of the frame, the negative pressure adsorption unit is mounted on the other end of the frame, the perforated conveyor belt of the negative pressure adsorption unit is connected to the film feeding drive unit, the film pressing unit is mounted on the frame, and the film pressing unit is matched with the film feeding drive unit.

[0005] A better choice is that the film feeding drive unit includes a film feeding motor, a film feeding drive synchronous wheel, a film feeding synchronous belt, a first film feeding synchronous wheel, a second film feeding synchronous wheel, a conveyor belt active roller, a film feeding active roller, a first driven synchronous wheel, a driven synchronous belt, a second driven synchronous wheel and a conveyor belt driven roller, the conveyor belt active roller, the film feeding active roller and the conveyor belt driven roller can be rotatably installed on the frame, the film feeding motor is installed on the frame, the film feeding drive synchronous wheel is installed on the film feeding motor, and the first film feeding synchronous wheel is connected to the conveyor belt active roller The two ends of the film feeding active roller are respectively connected to the second film feeding synchronous wheel and the first driven synchronous wheel, the film feeding driving synchronous wheel, the first film feeding synchronous wheel and the second film feeding synchronous wheel are connected through a film feeding synchronous belt, the first driven synchronous wheel is connected to the second driven synchronous wheel through the driven synchronous belt, the second driven synchronous wheel is connected to the conveyor belt driven roller, the perforated conveyor belt is respectively connected to the conveyor belt active roller and the conveyor belt driven roller, the conveyor belt active roller and the film feeding active roller are both matched with the film pressing unit.

[0006] A better choice is that the negative pressure adsorption unit includes a perforated suction cover, a first exhaust fan, a first exhaust pipe, a second exhaust fan, a second exhaust pipe, an exhaust bottom shell and a perforated conveyor belt, the first exhaust pipe and the second exhaust pipe are both installed at the bottom of the exhaust bottom shell, the first exhaust fan is connected to the exhaust bottom shell through the first exhaust pipe, the second exhaust fan is connected to the exhaust bottom shell through the second exhaust pipe, the exhaust bottom shell is connected to the perforated suction cover to form a negative pressure cavity, the perforated conveyor belt and the perforated suction cover are both provided with multiple through holes, the perforated conveyor belt covers the perforated suction cover, and the perforated conveyor belt is connected to the film feeding drive unit.

[0007] A better choice is that the film pressing unit includes a film pressing bracket, a film pressing driven roller and a film guiding rod, the film pressing bracket is installed on the frame, the two ends of the film pressing driven roller are rotatably installed on the film pressing bracket, one end of the film guiding rod is installed on the film pressing bracket, and the other end of the film guiding rod is matched with the film feeding drive unit respectively.

[0008] The lifting mechanism is connected with the lifting mechanism, and the lifting mechanism is connected with the lifting mechanism of the lifting mechanism is connected with the lifting mechanism of the lifting mechanism.

[0009] A better option also includes a conveyor belt tensioning assembly, which includes multiple retractors and a tensioning mounting box. The tensioning mounting box is installed on the frame, and multiple retractors are installed on the tensioning mounting box. Multiple retractors are slidably connected to the perforated conveyor belt.

[0010] A better choice is that the telescopic device includes a telescopic rod, a spring, a guide rod, a roller support frame, a pulley and an adjusting bolt, the roller support frame is respectively connected to the guide rod and the telescopic rod, the pulley is rotatably mounted on the roller support frame, the pulley is connected to the perforated conveyor belt, the guide rod and the telescopic rod can be slidably mounted on the tensioning mounting box, the two ends of the spring are respectively abutted against the adjusting bolt and the telescopic rod, and the adjusting bolt is mounted on the tensioning mounting box.

[0011] A more preferred option further includes a first synchronous belt tensioning assembly, which is adjustably mounted on the frame and connected to the film-cutting synchronous belt.

[0012] A better choice is that the first synchronous belt tensioning assembly includes an adjustment plate, an adjustment shaft and a tensioning wheel, the tensioning wheel is connected to the film cutting synchronous belt, the tensioning wheel is connected to the adjustment plate through the adjustment shaft, and the adjustment plate is adjustably mounted on the frame.

[0013] A better choice is that the film cutting tool includes a film cutting roller, a connecting rod and a film cutting knife, the film cutting knife is connected to the film cutting roller through the connecting rod, the film cutting roller is rotatably mounted on the frame, and the film cutting roller is connected to the film cutting driven synchronous wheel.

[0014] The present invention has the following advantages and beneficial effects compared to the prior art:

[0015] The utility model can realize automatic film feeding and automatic film cutting through the negative pressure adsorption unit, the film pressing unit, the film cutting drive unit, the film feeding drive unit and the frame, thereby reducing labor costs and improving work efficiency. The film cutting drive unit solves the technical problem that the stop position of the cutter in the prior art is difficult to be accurate, which leads to the easy occurrence of film cutting length. The stop position of the cutter is accurately guaranteed to avoid the phenomenon of film cutting length and interference with the film feeding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a film feeding and cutting device of the utility model;

[0017] Figure 2 This is a schematic diagram of a film feeding and cutting device of the utility model;

[0018] Figure 3 This is a schematic diagram of a film cutting unit and a film feeding unit of a film feeding and cutting device of the present invention;

[0019] Figure 4 This is a schematic diagram of a film cutting unit and a film feeding unit of a film feeding and cutting device of the present invention;

[0020] Figure 5 This is a schematic diagram of a film cutting tool of a film feeding and cutting device of the present invention;

[0021] Figure 6 This is a schematic diagram of a negative pressure adsorption unit of a film feeding and cutting device of the present invention;

[0022] Figure 7 This is a schematic diagram of the internal structure of a negative pressure adsorption unit of a film feeding and cutting device of the present invention;

[0023] Figure 8 This is a schematic diagram of a film pressing unit of a film feeding and cutting device of the present invention;

[0024] Figure 9 This is a schematic diagram of a film pressing unit of a film feeding and cutting device of the present invention;

[0025] Figure 10 This is a schematic diagram of a frame of a film feeding and cutting device of the present invention;

[0026] Figure 11 This is a schematic diagram of a conveyor belt tensioning assembly of a film feeding and cutting device of the present invention;

[0027] Figure 12 This is a schematic diagram of a telescopic device of a film feeding and cutting device of the present invention;

[0028] Figure 13This is a schematic diagram of the principle of a film feeding and cutting device of the utility model;

[0029] The markings of the components in the accompanying drawings are as follows: 1-negative pressure adsorption unit; 101-perforated suction cover; 102-first exhaust fan; 103-first exhaust pipe; 104-second exhaust fan; 105-second exhaust pipe; 106-exhaust bottom shell; 107-perforated conveyor belt; 2-film pressing unit; 201-film pressing bracket; 202-film pressing driven roller; 203-film guide rod; 204-first blowing pipe; 3-film cutting drive unit; 301-film cutting motor; 302-film cutting drive Synchronous wheel; 303-film cutting synchronous belt; 304-film cutting driven synchronous wheel; 305-first synchronous belt tensioning assembly; 3051-adjusting plate; 3052-adjusting shaft; 3053-tensioning wheel; 306-film cutting tool; 306a-film cutting roller; 306b-connecting rod; 306c-film cutting knife; 4-film feeding drive unit; 401-film feeding motor; 402-film feeding drive synchronous wheel; 403-film feeding synchronous belt; 404-first film feeding synchronous wheel; 405- Second film-feeding synchronous wheel; 406 - second synchronous belt tensioning assembly; 407 - conveyor belt driving roller; 408 - film-feeding driving roller; 409 - first driven synchronous wheel; 410 - driven synchronous belt; 411 - second driven synchronous wheel; 412 - conveyor belt driven roller; 5 - frame; 501 - support beam; 502 - side plate; 503 - baffle; 504 - first conveyor belt driven roller; 505 - second conveyor belt driven roller; 506 - third conveyor belt driven roller ;507-conveyor belt tensioning assembly;5071-retractor;5071a-adjusting bolt;5071b-spring;5071c-guide rod;5071d-roller support frame;5071e-pulley;5071f-retractable rod;5072-tensioning mounting box;508-film guide plate;509-first film guide roller;510-second film guide roller;511-third film guide roller;512-second blowing pipe;6-film roll;601-film. DETAILED DESCRIPTION

[0030] The utility model object of the utility model is further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation methods of the utility model are not limited to the following embodiments.

[0031] like Figure 1 and 2As shown, a film feeding and cutting device includes a negative pressure adsorption unit 1, a film pressing unit 2, a film cutting drive unit 3, a film feeding drive unit 4, and a frame 5. The negative pressure adsorption unit 1 is mounted at the front end of the frame 5, and the film feeding drive unit 4 is mounted at the rear end of the frame 5. The perforated conveyor belt 107 of the negative pressure adsorption unit 1 is connected to the film feeding drive unit 4. The film cutting drive unit 3 is mounted on the frame 5, located above the film feeding drive unit 4. The film pressing unit 2 is mounted on top of the frame 5, matching the film pressing unit 2 and the film feeding drive unit 4.

[0032] The negative pressure adsorption unit 1 is used to generate negative pressure to adsorb the film 601 onto the perforated conveyor belt 107 to prevent the film 601 from detaching from the perforated conveyor belt 107. The film pressing unit 2 is used to press the film 601 to prevent the film 601 from detaching from the film feeding drive unit 4 and the perforated conveyor belt 107. The film cutting drive unit 3 is used to accurately cut the film 601 to prevent the cut length of the film 601 from being too long or too short. The film feeding drive unit 4 is used to drive the perforated conveyor belt 107 of the negative pressure adsorption unit 1 to rotate, thereby realizing the transmission of the film 601. The frame 5 is used to install each unit and guide the transportation direction of the film 601.

[0033] like Figure 3 and 4 As shown, the film cutting drive unit 3 includes a film cutting motor 301, a film cutting drive synchronous pulley 302, a film cutting synchronous belt 303, a film cutting driven synchronous pulley 304, a first synchronous belt tensioning assembly 305, and a film cutting tool 306. The film cutting tool 306 includes a film cutting roller 306a, a connecting rod 306b, and a film cutting knife 306c. The first synchronous belt tensioning assembly 305 includes an adjustment plate 3051, an adjustment shaft 3052, and a tensioning pulley 3053. The film cutting motor 301 is mounted inside the side panel 502 on the right side of the frame 5. The rotating shaft of the film cutting motor 301 passes through the side panel 502 and is connected to the film cutting drive synchronous pulley 302. The film cutting drive synchronous pulley 302 is connected to the film cutting driven synchronous pulley 304 via the film cutting synchronous belt 303. The adjustment plate 3052 is adjustably mounted on the side panel 502 on the right side of the frame 5, and the tensioning pulley 3053 is connected to the adjustment plate 3051 via the adjustment shaft 3052. The film-cutting driven synchronous pulley 304 is mounted on the right end of the film-cutting roller 306a. The ends of the film-cutting roller 306a are rotatably mounted on the two side panels 502 of the frame 5. The film-cutting knife 306c is connected to the film-cutting roller 306a via a connecting rod 306b. The axial directions of the film-cutting knife 306c, the connecting rod 306b, and the film-cutting roller 306a are aligned. The film-cutting knife 306c is located above the perforated conveyor belt 107 of the negative pressure adsorption unit 1.

[0034] The film cutting motor 301 drives the film cutting tool 306 to rotate, enabling the film cutting tool 306 to precisely cut the film 601. The film cutting drive synchronous pulley 302, the film cutting synchronous belt 303, and the film cutting driven synchronous pulley 304 transmit and adjust the rotational speed. The first synchronous belt tensioning assembly 305 controls the tension of the film cutting synchronous belt 303. The film cutting tool 306 is used to cut the film 601. The film cutting roller 306a transmits the film cutting tool 306c, switching its position. The connecting rod 306b connects and secures the film cutting tool 306c. The film cutting tool 306c is used to cut the film 601. The adjustment plate 3051 adjusts the position of the tensioning pulley 3053. The adjustment shaft 3052 sets the tensioning pulley at a distance that allows it to contact the film cutting synchronous belt 303. The tensioning pulley 3053 compresses the film cutting synchronous belt 303.

[0035] like Figure 3-5 As shown, the film feed drive unit 4 includes a film feed motor 401, a film feed drive synchronous pulley 402, a film feed synchronous belt 403, a first film feed synchronous pulley 404, a second film feed synchronous pulley 405, a conveyor belt driving roller 407, a film feed driving roller 408, a first driven synchronous pulley 409, a driven synchronous belt 410, a second driven synchronous pulley 411, a second synchronous belt tensioning assembly 406, and a conveyor belt driven roller 412. The conveyor belt driving roller 407, the film feed driving roller 408, and the conveyor belt driven roller 412 are all rotatably mounted on two side panels 502 of the frame 5, with the conveyor belt driven roller 412 located between the conveyor belt driving roller 407 and the film feed driving roller 408. The film cutting blade 306c of the film cutting drive unit 3 is located above the conveyor belt driven roller 412 and also above the perforated conveyor belt 107. The film feed motor 401 is mounted on the inside of the side panel 502 on the left side of the frame 5. The rotating shaft of the film feed motor 401 passes through the side plate 502 and is connected to the film feed drive synchronous pulley 402. The first film feed synchronous pulley 404 is connected to the left end of the conveyor belt driving roller 407. The second film feed synchronous pulley 405 is connected to the left end of the film feed driving roller 408. The first driven synchronous pulley 409 is connected to the right end of the film feed driving roller 408. The film feed drive synchronous pulley 402, the first film feed synchronous pulley 404, and the second film feed synchronous pulley 405 are connected by the film feed synchronous belt 403. The second synchronous belt tensioning assembly 406 is mounted on the outside of the side plate 502 on the left side of the frame 5 and pushes the film feed synchronous belt 403. The first driven synchronous pulley 409 is connected to the second driven synchronous pulley 411 via the driven synchronous belt 410. The second driven synchronous pulley 411 is connected to the right end of the conveyor belt driven roller 412.

[0036] The film feed motor 401 powers the conveyor belt drive roller 407, the film feed drive roller 408, and the conveyor belt driven roller 412. The film feed drive synchronous pulley 402 transmits power to the film feed synchronous belt 403. The film feed synchronous belt 403 transmits power to the first and second film feed synchronous pulleys 404, 405, respectively. The first film feed synchronous pulley 404 transmits power to the conveyor belt drive roller 407. The second film feed synchronous pulley 405 transmits power to the film feed drive roller 408. The film feed drive roller 408 conveys the film 601. The conveyor belt drive roller 407 and the conveyor belt driven roller 412 both drive the perforated conveyor belt 107. The first driven synchronous pulley 409 transmits power from the conveyor belt drive roller 407 to the driven synchronous belt 410. The driven synchronous belt 410 transmits power from the conveyor belt drive roller 407 to the second driven synchronous pulley 411. The second driven synchronous wheel 411 is used to transmit power to the conveyor belt driven roller 412. The structure of the second synchronous belt tensioning assembly 406 is similar to the second synchronous belt tensioning assembly 406, and is used to control the tension of the film feeding synchronous belt 403.

[0037] like Figure 6 and 7 As shown, the negative pressure adsorption unit 1 includes a perforated suction cover 101, a first exhaust fan 102, a first exhaust duct 103, a second exhaust fan 104, a second exhaust duct 105, an exhaust bottom housing 106, and multiple perforated conveyor belts 107. The first and second exhaust ducts 103, 105 are symmetrically mounted at the bottom of the exhaust bottom housing 106 and extend to the left and right sides of the exhaust bottom housing 106. The first exhaust fan 102 is connected to the exhaust bottom housing 106 via the first exhaust duct 103, and the second exhaust fan 104 is connected to the exhaust bottom housing 106 via the second exhaust duct 105. The exhaust bottom housing 106 is connected to the perforated suction cover 101 to form a negative pressure chamber. The plurality of perforated conveyor belts 107 and the perforated suction cover 101 are each provided with a plurality of through holes. The perforated conveyor belts 107 cover the upper surface of the perforated suction cover 101 and can slide back and forth relative to the perforated suction cover 101. The front end of the perforated conveyor belt 107 is mounted on the first conveyor belt driven roller 504 of the frame 5, and the rear end of the perforated conveyor belt 107 is connected to the conveyor belt driving roller 407 and the conveyor belt driven roller 412 of the film feeding drive unit 4.

[0038] The perforated suction cover 101 supports multiple perforated conveyor belts 107, providing support and ventilation. The first and second exhaust fans 102, 104 generate negative pressure. The first and second exhaust ducts 103, 105 guide this negative pressure. The exhaust bottom housing 106 and the perforated suction cover 101 form a one-way negative pressure cavity, guiding the negative pressure. The perforated conveyor belts 107 transport and absorb the film 601.

[0039] like Figure 8 and9 As shown, the film pressing unit 2 includes a film pressing support 201, two film pressing driven rollers 202, a plurality of film guide rods 203 and two first blowing pipes 204. The two ends of the film pressing support 201 are mounted on the two side panels 502 of the frame 5. The middle part of the film pressing support 201 is located above the film feeding drive unit 4. The two ends of the two film pressing driven rollers 202 are rotatably mounted on the two ends of the film pressing support 201. A plurality of annular grooves are provided on the two film pressing driven rollers 202, and the annular grooves are arranged at a certain distance. One end of the plurality of guide rods is respectively mounted on the annular grooves of the two film pressing driven rollers 202. The other ends of the plurality of guide rods are used to press the film 601. The multiple die guides of the front film pressing driven roller 202 press the film 601 onto the multiple perforated conveyor belts 107. The multiple die guides of the rear film pressing driven roller 202 press the film 601 onto the film feeding active roller 408 of the film feeding drive unit 4. The two first blowing pipes 204 are mounted at both ends of the film pressing bracket 201 and are located between the two film pressing driven rollers 202.

[0040] The film pressing support 201 is used to mount the film pressing driven roller 202 and the first blowing pipe 204, providing support. The film pressing driven roller 202 rotates passively to prevent friction between the film guide rod 203 and the film 601, which could damage the film 601. The film guide rod 203 presses the film 601 against the film feed active roller 408 and the perforated conveyor belt 107, respectively. The first blowing pipe 204 eliminates static electricity in the film 601 by blowing air, preventing the film 601 from rolling up along the film cutting tool 306 after being cut.

[0041] like Figure 10As shown, the frame 5 includes two supporting beams 501, two side panels 502, three baffles 503, a first conveyor belt driven roller 504, a second conveyor belt driven roller 505, a third conveyor belt driven roller 506, a film guide plate 508, a first film guide roller 509, a second film guide roller 510, a third film guide roller 511, a second blowpipe 512, and a conveyor belt tensioning assembly 507. The two side panels 502 are arranged parallel to each other and connected by the three baffles 503. One end of each supporting beam 501 is connected to the bottom of one side panel 502, and the other end of each supporting beam 501 is connected to the bottom of the other side panel 502. The ends of the first conveyor belt driven roller 504 are rotatably mounted on the front ends of the two side panels 502. The ends of the second conveyor belt driven roller 505 are connected to the inner sides of the two side panels 502 and are located below the negative pressure adsorption unit 1. The ends of the third conveyor belt driven roller 506 are rotatably mounted on the inner sides of the two side panels 502 and are located below the film feed drive unit 4. The ends of the second blow pipe 512 are mounted on the front ends of the two side panels 502, in front of the first conveyor belt driven roller 504. The first film guide roller 509 is mounted on the front side of the front support beam 501. The second film guide roller 510 is mounted on the rear side of the rear support beam 501. The third film guide roller 511 is rotatably mounted on the rear inner sides of the two side panels 502 and is located behind the film feed drive unit 4. The ends of the film guide plate 508 are mounted on the rear inner sides of the two side panels 502 and mate with the film feed active roller 408 of the film feed drive unit 4. The conveyor belt tensioning assembly 507 is mounted on the center inner sides of the two side panels 502 and presses the multiple perforated conveyor belts 107.

[0042] The support beam 501 supports the side panels 502. The side panels 502 are used to mount the various units. The baffle 503 securely connects the two side panels 502. The first conveyor belt driven roller 504, the second conveyor belt driven roller 505, and the third conveyor belt driven roller 506 all secure the perforated conveyor belt 107 and are driven by the perforated conveyor belt 107. The film guide plate 508 guides the film 601 onto the film feed active roller 408. The first film guide roller 509, the second film guide roller 510, and the third film guide roller 511 all guide the film 601 onto the mechanism. The second blow pipe 512 blows air into the film 601 to prevent friction between the film 601 and the second blow pipe 512, which could damage the film 601. The conveyor belt tensioning assembly 507 controls the tension of the perforated conveyor belt 107.

[0043] like Figure 11 and 12As shown, the conveyor belt tensioning assembly 507 includes multiple telescoping devices 5071 and a tensioning mounting box 5072. The ends of the tensioning mounting box 5072 are mounted on the inner side of the two side panels 502 of the frame 5. The multiple telescoping devices 5071 are mounted within the tensioning mounting box 5072 and arranged in a sequential manner, with each telescoping device 5071 corresponding to each of the multiple perforated conveyor belts 107. Each telescoping device 5071 includes a telescoping rod 5071f, a spring 5071b, two guide rods 5071c, a roller support frame 5071d, a pulley 5071e, and an adjusting bolt 5071a. The rear end of the roller support frame 5071d is connected to the two guide rods 5071c and the telescoping rod 5071f, respectively. The telescoping rod 5071f is located between the two guide rods 5071c. Pulley 5071e is rotatably mounted on the front end of roller support frame 5071d. Two guide rods 5071c are slidably mounted on tensioning mounting box 5072. Adjusting bolt 5071a is mounted on the rear end of tensioning mounting box 5072 and abuts one end of spring 5071b. Telescopic rod 5071f is slidably mounted on the front end of tensioning mounting box 5072 and abuts the other end of spring 5071b. Pulley 5071e is in rolling connection with perforated conveyor belt 107.

[0044] The expander 5071 automatically controls the tension of the perforated conveyor belt 107. The tensioning mounting box 5072 is used to sequentially mount the expanders 5071 on the frame 5. The expansion rod 5071f transmits pressure. The spring 5071b adjusts the tension of the perforated conveyor belt 107 through its elasticity. The guide rod 5071c guides the roller support frame 5071d. The roller support frame 5071d is used to mount the pulley 5071e. The pulley 5071e reduces friction between the perforated conveyor belt 107 and the expander 5071. The adjusting bolt 5071a adjusts the extension length of the expander 5071.

[0045] A film feeding and cutting device working principle description: Figure 13As shown, film 601 is pulled from film roll 6, passing sequentially through first film guide roller 509, second film guide roller 510, and third film guide roller 511. Finally, film 601 is guided onto film feed drive roller 408 by film guide plate 508 and film pressing unit 2. Driven by the conveyor belt drive roller 407 and conveyor belt driven roller 412, perforated conveyor belt 107 moves forward. Driven by film feed drive roller 408, film 601 is fed between perforated conveyor belt 107 on conveyor belt drive roller 407 and film pressing unit 2, where it continues to move forward. Under the influence of the negative pressure generated by negative pressure suction unit 1, film 601 is sucked onto perforated conveyor belt 107 through the negative pressure. Film 601 continues to advance, reaching the end of perforated conveyor belt 107. It is then blown by second blowpipe 512, reducing friction between the blowpipe 512 and film 601, thus preventing damage to film 601. When film 601 reaches a certain length, driven by film motor 301 of film drive unit 3, film cutter 306 rotates, and film cutter 306c of film cutter 306 cuts film 601. Because film cutter 306c is directly driven by film motor 301, the cutter's stopping position is precisely guaranteed, preventing the film from being cut too long or interfering with the film feeding process.

[0046] The above specific implementation methods are preferred embodiments of the present invention and cannot limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the scope of protection of the present invention.

Claims

1. A film feeding and cutting device, characterized in that: It includes a negative pressure adsorption unit, a film pressing unit, a film cutting drive unit, a film feeding drive unit and a frame, the film cutting drive unit includes a film cutting motor, a film cutting drive synchronous wheel, a film cutting synchronous belt, a film cutting driven synchronous wheel and a film cutting tool, the film cutting tool is rotatably mounted on the frame, the film cutting driven synchronous wheel is connected to the film cutting tool, the film cutting driven synchronous wheel is connected to the film cutting drive synchronous wheel through the film cutting synchronous belt, the film cutting drive synchronous wheel is mounted on the film cutting motor, the film cutting motor is mounted on the frame, the film feeding drive unit is mounted on one end of the frame, the negative pressure adsorption unit is mounted on the other end of the frame, the perforated conveyor belt of the negative pressure adsorption unit is connected to the film feeding drive unit, the film pressing unit is mounted on the frame, and the film pressing unit is matched with the film feeding drive unit.

2. The film feeding and cutting device according to claim 1, characterized in that: The film feeding drive unit includes a film feeding motor, a film feeding drive synchronous wheel, a film feeding synchronous belt, a first film feeding synchronous wheel, a second film feeding synchronous wheel, a conveyor belt active roller, a film feeding active roller, a first driven synchronous wheel, a driven synchronous belt, a second driven synchronous wheel and a conveyor belt driven roller. The conveyor belt active roller, the film feeding active roller and the conveyor belt driven roller are all rotatably mounted on the frame, the film feeding motor is mounted on the frame, the film feeding drive synchronous wheel is mounted on the film feeding motor, the first film feeding synchronous wheel is connected to the conveyor belt active roller, and the The two ends of the film feeding active roller are respectively connected to the second film feeding synchronous wheel and the first driven synchronous wheel, the film feeding driving synchronous wheel, the first film feeding synchronous wheel and the second film feeding synchronous wheel are connected through a film feeding synchronous belt, the first driven synchronous wheel is connected to the second driven synchronous wheel through the driven synchronous belt, the second driven synchronous wheel is connected to the conveyor belt driven roller, the perforated conveyor belt is respectively connected to the conveyor belt active roller and the conveyor belt driven roller, the conveyor belt active roller and the film feeding active roller are both matched with the film pressing unit.

3. The film feeding and cutting device according to claim 1, characterized in that: The negative pressure adsorption unit includes a perforated suction cover, a first exhaust fan, a first exhaust pipe, a second exhaust fan, a second exhaust pipe, an exhaust bottom shell and a perforated conveyor belt. The first exhaust pipe and the second exhaust pipe are both installed at the bottom of the exhaust bottom shell. The first exhaust fan is connected to the exhaust bottom shell through the first exhaust pipe, and the second exhaust fan is connected to the exhaust bottom shell through the second exhaust pipe. The exhaust bottom shell is connected to the perforated suction cover to form a negative pressure cavity. The perforated conveyor belt and the perforated suction cover are both provided with multiple through holes. The perforated conveyor belt covers the perforated suction cover, and the perforated conveyor belt is connected to the film feeding drive unit.

4. The film feeding and cutting device according to claim 1, characterized in that: The film pressing unit includes a film pressing bracket, a film pressing driven roller and a film guiding rod. The film pressing bracket is installed on the frame. Both ends of the film pressing driven roller are rotatably installed on the film pressing bracket. One end of the film guiding rod is installed on the film pressing bracket, and the other end of the film guiding rod is matched with the film feeding drive unit respectively.

5. The film feeding and cutting device according to claim 1, characterized in that: The lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and the lifting mechanism is a bottom loader, and 6. The film feeding and cutting device according to claim 5, characterized in that: It also includes a conveyor belt tensioning assembly, which includes multiple retractors and a tensioning mounting box. The tensioning mounting box is installed on the frame, and multiple retractors are installed on the tensioning mounting box. Multiple retractors are slidably connected to the perforated conveyor belt.

7. The film feeding and cutting device according to claim 6, characterized in that: The telescopic device includes a telescopic rod, a spring, a guide rod, a roller support frame, a pulley and an adjusting bolt. The roller support frame is respectively connected to the guide rod and the telescopic rod. The pulley is rotatably mounted on the roller support frame. The pulley is connected to the perforated conveyor belt. The guide rod and the telescopic rod can be slidably mounted on the tensioning mounting box. The two ends of the spring are respectively in contact with the adjusting bolt and the telescopic rod. The adjusting bolt is mounted on the tensioning mounting box.

8. The film feeding and cutting device according to claim 1, characterized in that: It also includes a first synchronous belt tensioning assembly, which is adjustably mounted on the frame and connected to the film cutting synchronous belt.

9. The film feeding and cutting device according to claim 8, characterized in that: The first synchronous belt tensioning assembly includes an adjustment plate, an adjustment shaft and a tensioning wheel. The tensioning wheel is connected to the film cutting synchronous belt. The tensioning wheel is connected to the adjustment plate through the adjustment shaft. The adjustment plate is adjustably mounted on the frame.

10. The film feeding and cutting device according to claim 1, characterized in that: The film cutting tool includes a film cutting roller, a connecting rod and a film cutting knife. The film cutting knife is connected to the film cutting roller through the connecting rod. The film cutting roller is rotatably mounted on the frame. The film cutting roller is connected to the film cutting driven synchronous wheel.

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