Film drawing mechanism of liquid packaging machine

Abstract

The utility model discloses a film drawing mechanism of a liquid packaging machine. The film drawing mechanism comprises a rack, a driving roller, a driven roller, a driving device, a pushing device and a material sensor, through cooperation of the driving roller and the driven roller, the driving film drawing belt and the driven film drawing belt are driven to rotate to draw the packaging film, and stable and uniform pulling force can be provided. The first swing arm and the second swing arm respectively drive the first roller and the second roller to clamp the packaging film, and air in the packaging film is extruded out; according to the utility model, film drawing and extrusion exhaust can be simultaneously carried out, and the vacuum packaging efficiency and quality of liquid paste materials are effectively improved. In addition, the whole structural design is compact, the structures and the matching of all the components are simple, the occupied space is small, the liquid packaging machine is favorable for being installed on various liquid packaging machines, and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing equipment technical field more specifically, especially, it is particularly related to a kind of liquid packing machine film pulling mechanism. BACKGROUND

[0002] Liquid packing machine is mainly used for packing various liquid and paste materials with high viscosity, such as emulsion in cosmetics, sauce in food, medicinal plaster in pharmaceutical industry, etc. The film pulling mechanism of the existing liquid packing machine can only pull the packaging film, and does not have the function of exhausting the packaging bag. Too much gas increases the pressure in the packaging bag, making it difficult to seal or not tightly sealed. Therefore, an additional bag exhaust device is needed, which makes the packing machine too large, the internal structure complex, the cost high, and not easy to maintain. SUMMARY

[0003] The utility model provides a kind of liquid packing machine film pulling mechanism to solve the problem raised in the above background technology. To achieve the above purpose, the utility model provides the following technical scheme: a kind of liquid packing machine film pulling mechanism is used on liquid packing machine, including rack, driving roller, driven roller, drive device, pushing device and material sensor;The driving roller is rotatably arranged on the rack, and the driving roller is provided with a rotatable first swing arm;The driven roller is connected with the pushing device, and the pushing device is used to push the driven roller;The driven roller is provided with a second swing arm linked with the first swing arm;The second swing arm and the driven roller are rotatably connected, and the second swing arm is provided with a swing seat;The drive device is transmissionally connected with one end of the driving roller, and the other end of the driving roller is provided with a driving wheel, one end of the driven roller is provided with a driven wheel, and the driven wheel is matched with the driving wheel;The driving roller is provided with a driving film pulling belt, and the driven roller is provided with a driven film pulling belt, and the driving film pulling belt is oppositely arranged with the driven film pulling belt;The bottom of the first swing arm is provided with a first roller, and the bottom of the second swing arm is provided with a second roller, and the first roller is oppositely arranged with the second roller;The first roller is transmissionally connected with the driving roller, and the second roller is transmissionally connected with the driven roller;The material sensor is arranged on the rack and is used to detect the material.

[0004] Preferably, the structure of the first swing arm is the same as that of the second swing arm, and the two are symmetrically arranged;The first swing arm includes a support plate, and the two ends of the support plate are respectively provided with a swing arm, and the upper part of the swing arm is rotatably connected with the driving roller;The inner side of the swing arm is provided with a sector gear.

[0005] Preferably, the driving roller is provided with a first sprocket, the first roller is provided with a second sprocket, the driven roller is provided with a third sprocket, and the second roller is provided with a fourth sprocket; the first sprocket and the second sprocket are connected by a chain transmission, and the third sprocket and the fourth sprocket are connected by a chain transmission.

[0006] Preferably, the pushing device comprises a baffle, a pair of sliding seats, and a pair of pressing cylinders; the pair of sliding seats are respectively arranged at the two ends of the baffle, the frame is provided with sliding grooves matched with the sliding seats, and the sliding seats can slide in the sliding grooves; the piston rod of the pressing cylinder is connected with the baffle, and the cylinder body is connected with the liquid packaging machine; the driven roller is arranged on the pair of sliding seats, and the driven roller is rotatably connected with the sliding seats.

[0007] Preferably, the cross section of the sliding seat is H-shaped structure, and the upper and lower openings of the H-shaped structure are slidably connected with the side walls of the sliding grooves.

[0008] Preferably, the driving film pulling belt comprises a pair of front pulleys, the front pulleys are adjustably arranged on the driving roller, and the front film pulling belt is sleeved on the outer side of the front pulleys; the driven film pulling belt comprises a pair of rear pulleys, the pair of rear pulleys are arranged in cooperation with the pair of front pulleys; the rear pulleys are adjustably arranged on the driven roller, and the rear film pulling belt is sleeved on the outer side of the rear pulleys.

[0009] Preferably, the material sensor comprises a cross bar, a first adjusting seat, a first sliding rod, a second adjusting seat, a second sliding rod, a photoelectric seat, and a photoelectric sensor; the two ends of the cross bar are respectively connected with the frame; the first adjusting seat is adjustably arranged on the cross bar; the first sliding rod is adjustably arranged on the first adjusting seat; the second adjusting seat is adjustably arranged on the first sliding rod; the second sliding rod is adjustably arranged on the second adjusting seat; the photoelectric seat is adjustably arranged on the second sliding rod; and the photoelectric sensor is arranged on the photoelectric seat, and the detection end of the photoelectric sensor faces the material.

[0010] Preferably, the driving device comprises a servo motor and a speed reducer, the servo motor is installed on the speed reducer, and the speed reducer is installed on the frame; the output end of the servo motor is connected with the speed reducer, and the output end of the speed reducer is connected with the driving roller.

[0011] Preferably, the device further comprises a swinging device, the swinging device is installed in the liquid packaging machine and connected with the swinging seat.

[0012] Preferably, the swinging device is one of a pneumatic cylinder, a hydraulic cylinder, an electric push rod, and an electro-hydraulic push rod.

[0013] Compared with the prior art, the utility model discloses the beneficial effect is: the utility model discloses the cooperation of driving roller and driven roller, drive the active membrane belt and driven membrane belt rotation to pull the packaging film, can provide stable and uniform tension. First swing arm and second swing arm respectively drive first roller and second roller to clamp the packaging film, and the air in the film is extruded, the utility model discloses can realize the membrane and extrusion exhaust simultaneously, effectively improve the vacuum packaging efficiency and quality of liquid paste material. In addition, the utility model discloses compact overall structure design, the structure and cooperation of each component are simple, and the space is less, is favorable to install on various liquid packaging machines, and is convenient for maintenance and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structure diagram of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0015] Figure 2 It is another angle structure diagram of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0016] Figure 3 It is another angle structure diagram of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0017] Figure 4 It is the front view of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0018] Figure 5 It is the side view of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0019] Figure 6 It is another side view of liquid packaging machine membrane drawing mechanism of the utility model embodiment;

[0020] In Figures 1 to 6 The correspondence of each component name and drawing number is as follows:

[0021] 1-frame, 101-slotted, 2-driving roller, 3-following roller, 4-driving device, 401-servo motor, 402-reducer, 5-pushing device, 501-baffle, 502-sliding seat, 503-pressing cylinder, 6-material sensor, 601-crossbar, 602-first adjusting seat, 603-first sliding rod, 604-second adjusting seat, 605-second sliding rod, 606-photoelectric seat, 7-first swing arm, 701-supporting plate, 702-swing arm, 702a-fan-shaped gear, 8-second swing arm, 9-swinging seat, 10-driving wheel, 11-following wheel, 12-driving film pulling belt, 1201-front pulley, 1202-front film pulling belt, 13-following film pulling belt, 1301-rear pulley, 1302-rear film pulling belt, 14-first roller, 15-second roller, 16-first sprocket, 17-second sprocket, 18-third sprocket, 19-fourth sprocket. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be further described below in conjunction with the drawings and examples, the drawings are only used for reference and do not limit the embodiments of the present application. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0023] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" and the like are only for description purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Please refer to Figures 1 to 6The utility model provides a kind of liquid packing machine film pulling mechanism, for liquid packing machine, including rack 1, driving roller 2, driven roller 3, drive arrangement 4, pushing device 5 and material sensor 6;The driving roller 2 is rotatably arranged on the rack 1, rotatable first swing arm 7 is equipped on the driving roller 2;The driven roller 3 is connected with the pushing device 5, and the pushing device 5 is used to push the driven roller 3;Second swing arm 8 is equipped on the driven roller 3 and linked with the first swing arm 7;The second swing arm 8 is rotatably connected between the driven roller 3, swing seat 9 is equipped on the second swing arm 8;Drive arrangement 4 is transmission connection with one end of the driving roller 2, another section of the driving roller 2 is equipped with driving wheel 10, one end of the driven roller 3 is equipped with driven wheel 11, and the driven wheel 11 is matched with the driving wheel 10;Driving film pulling belt 12 is equipped on the driving roller 2, driven film pulling belt 13 is equipped on the driven roller 3, and the driving film pulling belt 12 is oppositely arranged with the driven film pulling belt 13;The bottom of the first swing arm 7 is equipped with first roller 14, the bottom of the second swing arm 8 is equipped with second roller 15, and the first roller 14 is oppositely arranged with the second roller 15;The first roller 14 is transmission connection with the driving roller 2, and the second roller 15 is transmission connection with the driven roller 3;Material sensor 6 is equipped on the rack 1 and is used to detect material.

[0026] In the embodiment of the utility model, pushing device 5 is used to push driven roller 3, so that driven wheel 11 on driven roller 3 can be butt-jointed with driving wheel 10 and realize transmission, and the interval of driving film pulling belt 12 and driven film pulling belt 13 can be controlled simultaneously, to adapt to the thickness and material of different packaging film.Swing seat 9 can be used to connect cylinder, oil cylinder, electric push rod or connecting rod mechanism and other driving devices with pushing force, these driving devices are installed on liquid packing machine, and are connected with swing seat 9, when driving device acts on swing seat 9, second swing arm 8 can be swung along the axis of driven roller 3 as center.Due to the transmission connection of first swing arm 7 and second swing arm 8, when second swing arm 8 moves, first swing arm 7 can be moved simultaneously, and first swing arm 7 is rotatably connected on driving roller 2, so first swing arm 7 also rotates synchronously.

[0027] Through the above structural arrangement, when the packaging film passes between the driving film pulling belt 12 and the driven film pulling belt 13, and between the first roller 14 and the second roller 15, the driving device 4 is started to drive the driving roller 2 to rotate. Since the driving roller 2 is in transmission connection with the driving device 4, the driving roller 2 starts to rotate, thereby driving the driving wheel 10 to rotate. The driving wheel 10 drives the driven wheel 11 to rotate, so that the driven roller 3 rotates synchronously with the driving roller 2. The driving film pulling belt 12 and the driven film pulling belt 13 run at the same linear speed under the driving of the driving roller 2 and the driven roller 3, so as to clamp and pull the packaging film to forward convey.

[0028] In the film pulling process, the material sensor 6 detects the position information of the material in real time. When the material reaches the specified position, the material sensor 6 transmits a signal to the liquid packaging machine. The driving device in the liquid packaging machine acts on the swing seat 9, so that the second swing arm 8 moves, the second swing arm 8 acts on the first swing arm 7, and the two swing arms clamp the packaging film at the same time and squeeze out the air in the packaging film.

[0029] In order to improve the transmission efficiency of the packaging film in the extrusion process, the first roller 14 and the second roller 15 are arranged in the embodiment, and the first roller 14 is in transmission connection with the driving roller 2, and the second roller 15 is in transmission connection with the driven roller 3. In this way, when the driving roller 2 and the driven roller 3 rotate, the first roller 14 and the second roller 15 also move, so that the clamped packaging film can also be smoothly conveyed.

[0030] Preferably, the structure of the first swing arm 7 is the same as that of the second swing arm 8, and the two are symmetrically arranged; the first swing arm 7 comprises a support plate 701, both ends of the support plate 701 are respectively provided with swing arms 702, the upper part of the swing arm 702 is rotatably connected with the driving roller 2; the inner side of the swing arm 702 is provided with a sector gear 702a. In the embodiment, the first swing arm 7 and the second swing arm 8 are the same in structure and symmetrically arranged, which can keep the film pulling mechanism balanced during operation. When pulling the film, the symmetrical swing arms on both sides can apply uniform force to the packaging film, avoiding the influence of uneven extrusion on the exhaust effect. The structures of the two swing arms are the same, and the structure of the first swing arm 7 will be described below as an example: the upper part of the swing arm 702 is rotatably connected with the driving roller 2, so that the swing arm can rotate by a certain angle around the driving roller 2. The sector gear 702a arranged on the inner side of the swing arm 702 is used for linkage. Similarly, the second swing arm 8 is also provided with a corresponding sector gear 702a, and the two opposite sector gears 702a are engaged. In this way, when the second swing arm 8 rotates, the first swing arm 7 also rotates synchronously, thereby realizing the mutual approach or separation between the first roller 14 below the first swing arm 7 and the second roller 15 below the second swing arm 8.

[0031] Preferably, the driving roller 2 is provided with a first sprocket 16, the first roller 14 is provided with a second sprocket 17, the driven roller 3 is provided with a third sprocket 18, and the second roller 15 is provided with a fourth sprocket 19; the first sprocket 16 and the second sprocket 17 are connected by a chain transmission, and the third sprocket 18 and the fourth sprocket 19 are connected by a chain transmission. The transmission mode of the sprocket and the chain (the position of the chain is not marked in the figure, and a general chain can be selected as needed to realize the transmission during actual assembly) can ensure the accurate transmission ratio between the driving roller 2 and the first roller 14, and between the driven roller 3 and the second roller 15, so that the rotation of each roller remains synchronized during the film pulling process, ensuring that the packaging film can maintain consistent traction speed with the upper driving film pulling belt 12 and the driven film pulling belt 13 when it is clamped, reducing the deviation of the packaging film during the conveying process.

[0032] Preferably, the pushing device 5 includes a baffle 501, a pair of sliding seats 502, and a pair of pressing cylinders 503; the pair of sliding seats 502 are respectively arranged at both ends of the baffle 501, the rack 1 is provided with a sliding groove 101 matched with the sliding seat 502, and the sliding seat 502 can slide in the sliding groove 101; the piston rod of the pressing cylinder 503 is connected with the baffle 501, and the cylinder body is connected with the liquid packaging machine; the driven roller 3 is arranged on the pair of sliding seats 502, and the driven roller 3 is rotatably connected with the sliding seat 502.

[0033] In this embodiment, through the cooperation of the sliding seat 502 and the sliding groove 101 on the rack 1, the driven roller 3 can slide along the sliding groove 101 flexibly under the drive of the baffle 501. This enables the driven roller 3 to quickly adjust its relative position with the driving roller 2 according to different packaging film thicknesses, tension requirements, and position changes of the driving roller 2, etc., to ensure the cooperation accuracy between the two, and better realize the film pulling function. A pair of pressing cylinders 503 are symmetrically arranged on the baffle 501, which can provide uniform pressure for the driven roller 3. When it is necessary to press the packaging film, the two pressing cylinders 503 work synchronously to make the driven roller 3 closer to the driving roller 2, ensuring that the driving film pulling belt 12 and the driven film pulling belt 13 are in close contact, so that the packaging film receives consistent pressure during the film pulling process, avoiding the situation that the local pressure is too large or too small, thereby ensuring the stable conveying of the packaging film and preventing the packaging film from deviating or wrinkling during the film pulling process.

[0034] Preferably, the sliding seat 502 has a H-shaped structure in cross section, and the upper and lower openings of the H-shaped structure are respectively slidably connected with the side walls of the sliding groove 101. Through the above structure, the upper and lower openings of the H-shaped structure are connected with the side walls of the sliding groove 101, which can provide accurate guidance for the sliding of the sliding seat 502, ensure that the driven roller 3 keeps straight movement during the movement process and does not deviate left and right, thereby ensuring the parallelism between the driven roller 3 and the driving roller 2, and being beneficial to improving the stability and uniformity of the film drawing.

[0035] Preferably, the driving film drawing belt 12 comprises a pair of front pulleys 1201, the front pulleys 1201 are adjustably arranged on the driving roller 2, and a front film drawing belt 1202 is sleeved on the outer side of the front pulleys 1201; the driven film drawing belt 13 comprises a pair of rear pulleys 1301, the rear pulleys 1301 are arranged in cooperation with the front pulleys 1201; the rear pulleys 1301 are adjustably arranged on the driven roller 3, and a rear film drawing belt 1302 is sleeved on the outer side of the rear pulleys 1301. In the embodiment, the positions of the front pulleys 1201 on the driving roller 2 and the rear pulleys 1301 on the driven roller 3 are both adjustable, which makes the film drawing mechanism be able to be flexibly adjusted according to the packaging film with different widths, and improves the adaptability of the film drawing mechanism to packaging films with various specifications. By adopting the front and rear pulleys 1301 and cooperating with the front and rear film drawing belts 1302, the front or rear film drawing belt 1302 can be replaced in time after being worn out, so as to maintain good pulling effect. The film drawing belt is a common belt with tooth pattern on the inner side, and a silica gel layer or other rubber layer with good friction can be arranged on the outer side, so as to maintain good pulling effect.

[0036] Preferably, the material sensor 6 comprises a crossbar 601, a first adjusting seat 602, a first sliding rod 603, a second adjusting seat 604, a second sliding rod 605, a photoelectric seat 606 and a photoelectric sensor; the two ends of the crossbar 601 are connected with the rack 1 respectively; the first adjusting seat 602 is adjustably arranged on the crossbar 601; the first sliding rod 603 is adjustably arranged on the first adjusting seat 602; the second adjusting seat 604 is adjustably arranged on the first sliding rod 603; the second sliding rod 605 is adjustably arranged on the second adjusting seat 604; the photoelectric seat 606 is adjustably arranged on the second sliding rod 605; the photoelectric sensor is arranged on the photoelectric seat 606, and the detection end thereof faces the material. Through the above structure, the position of the photoelectric sensor (not indicated in the figure) in multiple dimensions can be adjusted. For example, the first adjusting seat 602 on the crossbar 601 can move along the crossbar 601 to adjust the position in the horizontal direction; the first sliding rod 603 can be adjusted on the first adjusting seat 602 to change the position perpendicular to the crossbar 601; the second adjusting seat 604 on the first sliding rod 603, the second sliding rod 605 on the second adjusting seat 604 and the photoelectric seat 606 on the second sliding rod 605 are all adjustable, which enables the photoelectric sensor to be arranged at the optimal detection position according to the position of different materials, the structure of the packaging machine and the production process requirements, so as to ensure accurate detection of the material.

[0037] Preferably, the driving device 4 comprises a servo motor 401 and a speed reducer 402; the servo motor 401 is installed on the speed reducer 402, and the speed reducer 402 is installed on the rack 1; the output end of the servo motor 401 is connected with the speed reducer 402, and the output end of the speed reducer 402 is connected with the driving roller 2. In this embodiment, the servo motor 401 has high-precision position control, speed control and torque control capabilities. After being matched with the speed reducer 402, the accurate control characteristics of the servo motor 401 can be transmitted to the driving roller 2, so as to realize accurate control of the rotating speed of the driving roller 2 and improve the film drawing effect of the packaging film.

[0038] Preferably, the swinging device is installed in the liquid packaging machine and connected with the swinging seat 9.

[0039] Preferably, the swinging device is one of a pneumatic cylinder, a hydraulic cylinder, an electric push rod or an electro-hydraulic push rod. In this embodiment, the swinging device can be one of a pneumatic cylinder, a hydraulic cylinder, an electric push rod or an electro-hydraulic push rod, and is installed on the liquid packaging machine and connected with the swinging seat 9, which drives the second swinging arm 8 to swing around the center line of the driven roller 3, so as to realize the movement of the first swinging arm 7.

[0040] Compared with the prior art, the utility model has the advantages that: the utility model discloses the cooperation of driving roller and driven roller, drives the rotation of driving membrane pulling belt and driven membrane pulling belt to pull the packaging film, can provide stable and uniform tension, the first swing arm and the second swing arm respectively drive the first roller and the second roller to clamp the packaging film, and the air in the packaging film is extruded, the utility model discloses can realize the simultaneous pulling of the membrane and the extrusion exhaust, effectively improve the vacuum packaging efficiency and quality of liquid paste material, in addition, the utility model discloses compact overall structure design, the structure and cooperation between parts are simple, and the occupied space is small, is favorable to the installation on various liquid packaging machines, and is convenient for maintenance and maintenance.

[0041] The embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A liquid packer film pulling mechanism for use on a liquid packer, characterized by, The utility model provides a kind of liquid packaging machine, including organic frame (1), driving roller (2), driven roller (3), driving device (4), pushing device (5) and material sensor (6);The driving roller is rotatably arranged on the frame, and the driving roller is provided with rotatable first swing arm (7);The driven roller is connected with the pushing device, and the pushing device is used to push the driven roller;The driven roller is provided with second swing arm (8) linked with the first swing arm;The second swing arm is rotatably connected between the driven roller, and the second swing arm is provided with swing seat (9);The driving device is transmission connected with one end of the driving roller, and the other end of the driving roller is provided with driving wheel (10), and one end of the driven roller is provided with driven wheel (11), and the driven wheel is matched with the driving wheel;The driving roller is provided with driving film belt (12), and the driven roller is provided with driven film belt (13), and the driving film belt is oppositely arranged with the driven film belt;The bottom of the first swing arm is provided with first roller (14), and the bottom of the second swing arm is provided with second roller (15), and the first roller is oppositely arranged with the second roller;The first roller is transmission connected with the driving roller, and the second roller is transmission connected with the driven roller;The material sensor is arranged on the frame and is used to detect material.

2. The liquid pack machine film-pulling mechanism according to claim 1, characterized in that, The structure of the first swing arm is same with the structure of the second swing arm, and both are symmetrically arranged;The first swing arm includes support plate (701), and both ends of the support plate are respectively provided with swing arm (702), and the upper portion of the swing arm is rotatably connected with the driving roller;The inner side of the swing arm is provided with sector gear (702a).

3. The liquid pack machine film-pulling mechanism according to claim 1, wherein, The driving roller is provided with first sprocket (16), the first roller is provided with second sprocket (17), the driven roller is provided with third sprocket (18), and the second roller is provided with fourth sprocket (19);The first sprocket and the second sprocket are transmission connected by chain, and the third sprocket and the fourth sprocket are transmission connected by chain.

4. The liquid pack machine film-pulling mechanism according to claim 1, wherein, The pushing device includes baffle (501), a pair of sliding seats (502) and a pair of pressing cylinders (503);A pair of sliding seats are respectively arranged at both ends of the baffle, and the frame is provided with sliding groove (101) matched with the sliding seat, and the sliding seat can slide in the sliding groove;The piston rod of the pressing cylinder is connected with the baffle, and the cylinder body is connected with the liquid packaging machine;The driven roller is arranged on a pair of sliding seats, and the driven roller is rotatably connected with the sliding seat.

5. The liquid pack machine film-pulling mechanism according to claim 4, wherein, The cross section of the sliding seat is H type structure, and the upper and lower openings of the H type structure are slidably connected with the side wall of the sliding groove respectively.

6. The liquid pack machine film-pulling mechanism according to claim 1, wherein, The active pulling film belt comprises a pair of front pulleys (1201) which are adjustably arranged on the active roller, and a front pulling film belt (1202) is sleeved on the outer side of the front pulleys; the driven pulling film belt comprises a pair of rear pulleys (1301) which are arranged in cooperation with the pair of front pulleys; the rear pulleys are adjustably arranged on the driven roller, and a rear pulling film belt (1302) is sleeved on the outer side of the rear pulleys.

7. The liquid pack machine film-pulling mechanism according to claim 1, wherein, The material sensor comprises a crossbar (601), a first adjusting seat (602), a first sliding rod (603), a second adjusting seat (604), a second sliding rod (605), a photoelectric seat (606) and a photoelectric sensor; the two ends of the crossbar are connected with the rack respectively; the first adjusting seat is adjustably arranged on the crossbar; the first sliding rod is adjustably arranged on the first adjusting seat; the second adjusting seat is adjustably arranged on the first sliding rod; the second sliding rod is adjustably arranged on the second adjusting seat; the photoelectric seat is adjustably arranged on the second sliding rod; the photoelectric sensor is arranged on the photoelectric seat, and the detection end of the photoelectric sensor faces the material.

8. The liquid pack machine film-pulling mechanism according to claim 1, wherein, The driving device comprises a servo motor (401) and a speed reducer (402); the servo motor is mounted on the speed reducer; the speed reducer is mounted on the rack; the output end of the servo motor is connected with the speed reducer; the output end of the speed reducer is connected with the active roller.

9. The liquid packaging machine film-pulling mechanism according to any one of claims 1 to 8, characterized in that, The driving device further comprises a swing device which is mounted in the liquid packaging machine and connected with the swing seat.

10. The liquid pack machine film-pulling mechanism according to claim 9, wherein, The swing device is one of a pneumatic cylinder, a hydraulic cylinder, an electric push rod and an electro-hydraulic push rod.

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