Film lifting roll changing device and bag making machine

Abstract

The utility model relates to the technical field of bag making machines, in particular to a film lifting roll changing device and a bag making machine, which comprise a rack, a lifting component and a roll changing arm, the rack is provided with a plurality of groups of mounting stations for mounting material rolls, the plurality of groups of mounting stations are arranged at intervals along the vertical direction of the rack, and the lifting component is arranged on the lifting component. The bottom of the rack is further provided with a switching station used for switching material rollers, the lifting assembly is assembled on the side wall of the rack and used for driving the roller replacing arm to move back and forth between the mounting station and the switching station, and the top of the roller replacing arm is provided with an arc-shaped groove used for containing the material rollers. The roller changing arm is vertically lifted and moved through the lifting assembly, and the material roller is placed in the arc-shaped groove of the roller changing arm, so that the material roller is lifted and conveyed, the automation degree is improved, the labor intensity is reduced, safe operation is facilitated, meanwhile, the material roller is positioned through the arc-shaped groove, and the lifting and conveying stability of the material roller is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bag making machine technical field especially a kind of film lifting roll changing device and bag making machine. BACKGROUND

[0002] Bag making machine is the core production equipment in soft packaging industry, and its core processing principle is: taking the upper and lower two film rolls (referred to as upper bag film and lower bag film respectively) as raw material, which is unfolded and pulled by multiple guide rollers, so that the two layers of film are overlapped and compounded after accurate alignment, and the compounded film is cut by heat sealing, finally completing the production.

[0003] In the prior art, the roll feeding structure of the bag making machine generally adopts a symmetrical layout, that is, two groups of roll feeding structures are vertically arranged in space to respectively undertake the feeding and unwinding tasks of the upper bag film and the lower bag film. When the film roll is used up, it needs to be replaced so that the bag making machine can continue to run. For the lower roll, its position is close to the ground, which provides favorable conditions for realizing semi-automatic roll changing. For example, hydraulic or pneumatic lifting tools are used for the operator to change the roll, so that the new roll and the lower roll can be assembled and disassembled for replacement. However, for the upper roll, its installation position is usually high from the ground, which makes the above-mentioned semi-automatic solution for the lower roll almost invalid, because the lifting tool cannot directly act on the high-positioned upper roll from the ground due to the limited stroke of the lifting tool. Therefore, when replacing the upper bag film, multiple operators usually need to work together. This process not only has high labor intensity and long time consumption, but also has the risk of falling of the roll or the upper roll during manual operation at high altitude.

[0004] Therefore, it is necessary to design a film lifting roll changing device to solve the above technical problems. INVENTION CONTENTS

[0005] In order to solve the problem of high labor intensity and low efficiency of film roll feeding of bag making machine, the present application provides a film lifting roll changing device and bag making machine.

[0006] In the first aspect, the utility model provides a kind of film lifting roll changing device, adopt following technical scheme:

[0007] A kind of film lifting roll changing device, including rack, the installation station for installing roll is provided in the rack, the installation station is provided with multiple groups, multiple groups the installation station is vertically spaced apart along the rack, further including lifting assembly, roll changing arm, the bottom of the rack is further provided with the switching station for switching roll, the lifting assembly is assembled in the side wall of the rack, and for driving the roll changing arm moves back and forth between installation station and switching station, the top of the roll changing arm is provided with the arc slot for placing roll.

[0008] Preferably, the roll changing arm is provided with two groups, and is located at the inner side of the two side walls of the rack transversely opposite to each other, and the arc-shaped slot is located at the outer side of the longitudinal side wall of the rack.

[0009] Preferably, the pulley and the guide rail are provided in the mounting slot of the rack, the pulley is connected with the roll shaft, the guide rail is connected with the top wall of the mounting slot, and the pulley and the guide rail are matched and arranged.

[0010] Preferably, the gas cylinder is arranged on the rack and used for moving the limiting pin back and forth towards the mounting station, and the limiting pin is used for abutting against the outer ring wall of the pulley.

[0011] Preferably, the outer ring wall of the pulley is provided with a V-shaped slot along the circumferential direction, and the limiting pin abuts against the inner wall of the V-shaped slot when the limiting pin moves downward.

[0012] Preferably, the pulley is further provided with a limiting slot recessed along the radial direction of the pulley from the bottom wall of the V-shaped slot, and the inner side wall of the mounting slot is provided with an arc-shaped part abutting against the inner bottom wall of the limiting slot when the limiting pin moves downward.

[0013] Preferably, the lifting assembly comprises a fixed seat, a chain and two groups of chain wheels, the chain wheels are arranged along the vertical direction of the rack, the chain is sleeved on the two groups of chain wheels, one side of the fixed seat is connected with the chain, and the other side of the fixed seat is connected with the roll changing arm.

[0014] Preferably, the lifting assembly further comprises a sliding rail and a sliding block, one side of the sliding block is connected with the roll changing arm, and the other side of the sliding block is slidably connected with the sliding rail.

[0015] Preferably, the lifting assembly further comprises a motor and a transmission rod, the transmission rod is used for connecting the chain wheels of the two groups of lifting assemblies, and the motor is arranged on the rack and used for rotating the transmission rod.

[0016] In the second aspect, the utility model provides a bag making machine which adopts the following technical scheme:

[0017] The bag making machine comprises the above-mentioned film lifting and roll changing device, and further comprises a bag making machine body, the film lifting and roll changing device is located on the feeding side of the bag making machine body and is used for feeding the film roll, and the mounting station is provided with two groups and is used for mounting the upper roll and the lower roll respectively.

[0018] The utility model discloses the beneficial effect is:

[0019] Through the vertical lifting movement of the change roll arm to the lifting assembly, and place the material roll in the arc groove of change roll arm, thereby the material roll is lifted and carries, solved the problem of the roll change height, improve the degree of automation, reduce the labor intensity, be favorable to safe operation, simultaneously, through setting up the arc groove, the positioning of material roll, improve the material roll lifting and carrying stability.

[0020] By setting the switching station at the bottom of the rack near the ground, it is convenient to take down the material roll from the change roll arm or place the material roll on the change roll arm, and since the switching station is vertically low from the ground, it helps the operator to change the roll of the new material, improves the operation convenience, reduces the tool use difficulty, reduces the roll changing time, and is beneficial to fast roll changing.

[0021] Through the limiting pin mechanism driven by the cylinder, the material roll is limited, and the stability of the film unwinding is improved. Secondly, the cylinder controls the locking and releasing of the limiting pin, solves the problem of inconvenient and low efficiency of traditional manual bolt operation, improves the automation degree and operation efficiency of the roll changing process, reduces the labor intensity of the operator, and reduces the time required for roll changing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the right view in the embodiment of the application.

[0023] Figure 2 It is Figure 1 The partial enlarged view of A in the figure.

[0024] Figure 3 It is the front view in the embodiment of the application.

[0025] Figure 4 It is the right view in the embodiment of the application.

[0026] Figure 5 It is the rack schematic diagram in the embodiment of the application.

[0027] Figure 6 It is Figure 5 The partial enlarged view of B in the figure.

[0028] Figure 7 It is the change roll arm schematic diagram in the embodiment of the application.

[0029] Figure 8 It is Figure 7 The partial enlarged view of C in the figure.

[0030] Figure 9 It is the pulley schematic diagram in the embodiment of the application.

[0031] Explanation of reference signs: 1, rack; 101, mounting groove; 1011, arc-shaped part; 102, guide rail; 103, air cylinder; 104, limit pin; 2, material roller; 201, pulley; 2011, V-shaped groove; 2021, limit groove; 3, lifting assembly; 301, fixed seat; 302, chain; 304, chain wheel; 305, sliding rail; 306, sliding block; 4, roller changing arm; 401, arc-shaped groove; 402, limit hook; 403, limit protrusion; 4031, inclined surface part; 404, avoiding groove; 5, motor; 501, transmission rod. DETAILED DESCRIPTION

[0032] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with figures, so that each technical feature and the overall technical scheme of the present application can be understood directly and intuitively, but it cannot be understood as a limitation on the protection scope of the present application.

[0033] In the description of the present application, if the orientation description such as "up", "down", "front", "back", "left", "right" and the like is referred to, the orientation or position relationship shown in the drawings is based on the orientation or position relationship, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the present application. When a feature is referred to as "set", "fixed", "connected" to another feature, it can be directly set, fixed, connected to another feature, or indirectly set, fixed, connected to another feature.

[0034] In the description of the present application, if "several" is referred to, it means one or more, if "multiple" is referred to, it means two or more, if "greater than", "less than", "exceeding" is referred to, it should be understood as not including the number, if "above", "below", "within" is referred to, it should be understood as including the number. If "first", "second" is referred to, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0035] Furthermore, unless otherwise defined, the technical and scientific terms used in this application have the same meanings as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and not for limiting the application. It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0036] Example 1: As Figures 1-9 As shown, a film lifting and changing device includes a frame 1, a lifting assembly 3, and a changing roller arm 4. The frame 1 is provided with an installation station for installing the material roller 2. Multiple sets of installation stations are arranged at intervals along the vertical direction of the frame 1. The bottom of the frame 1 is also provided with a changing station for switching the material roller 2. The changing station is located below the installation station. Since the changing station is located at the base of the frame 1, it is set close to the ground. The lifting assembly 3 is mounted on the transverse side wall of the frame 1 and is used to drive the changing roller arm 4 to move back and forth between the installation station and the changing station. The top of the changing roller arm 4 is provided with an arc-shaped groove 401 for placing the material roller 2. It is worth mentioning that the material roller 2 is an air-expanding shaft. The material roller 2 is used to pass through the film roll and the axis of the material roller 2 coincides with the axis of the film roll. The two ends of the material roller 2 are exposed at the axial ends of the film roll and are mounted on the frame 1, thereby forming the film feeding structure of the bag making machine.

[0037] The lifting assembly 3 vertically lifts and moves the roller changing arm 4, placing the material roller 2 in the arc-shaped groove 401 of the roller changing arm 4, thereby lifting and transporting the material roller 2. This solves the problem of the upper roller changing height, improves the degree of automation, reduces labor intensity, and is conducive to safe operation. At the same time, the arc-shaped groove 401 is set to position the material roller 2, improving the stability of the material roller 2 lifting and transport. Secondly, by setting the switching station at the bottom of the frame 1 close to the ground, it is convenient to remove the material roller 2 from the roller changing arm 4 or place the material roller 2 on the roller changing arm 4. Since the vertical height of the switching station is low, it helps the operator to change the roller of the new material roll, improves the convenience of operation, reduces the difficulty of using tools, reduces the time of changing rolls, and facilitates rapid roll changing.

[0038] Since the material roller 2 needs to be assembled in the mounting position of the rack 1 to complete the stable unwinding of the film roll, if the roller changing arm 4 vertically ascends along the vertical direction of the rack 1, interference will be caused between the two ends of the material roller 2 and the rack 1. In order to solve the above technical problems, in the specific structural design of the roller changing arm 4, two sets of roller changing arms 4 are arranged, and are respectively located on the inner sides of the two lateral walls of the rack 1 in the transverse direction, and the two sets of roller changing arms 4 are arranged in the transverse direction of the rack 1. The arc-shaped groove 401 is located on the outer side of the longitudinal side wall of the rack 1. By designing the roller changing arm 4 to be arranged on the inner sides of the two lateral walls of the rack 1 in the transverse direction, the two sides of the material roller 2 are supported, and the stability of the lifting of the material roller 2 is improved. In addition, the arc-shaped groove 401 is located on the outer side of the longitudinal side wall of the rack 1, which solves the problem of structural interference between the material roller 2 and the main body of the rack 1 during vertical lifting. The roller changing arm 4 drives the material roller 2 to move from the switching position to the mounting position at the same horizontal height, and then the material roller 2 is pushed from the roller changing arm 4 to the mounting position, thereby completing the installation of the material roller 2 and improving the smoothness of the roll changing process. When replacing the material roller 2, the roller changing arm 4 is moved to the same horizontal height as the mounting position, and then the material roller 2 is pushed from the mounting position to the roller changing arm 4, and then the lifting assembly 3 drives the roller changing arm 4 to descend to the switching position, thereby completing the disassembly of the material roller 2.

[0039] In order to facilitate the smoothness of the movement of the material roller 2 between the roller changing arm 4 and the mounting position, the embodiment further comprises a pulley 201 and a guide rail 102. The rack 1 is provided with a mounting groove 101 to form a mounting position. The mounting groove 101 is recessed from the longitudinal side wall of the rack 1 towards the outside. The pulley 201 is connected with the material roller 2. The guide rail 102 is connected to the top wall of the mounting groove 101. The pulley 201 is matched with the guide rail 102. When the material roller 2 is pushed into the mounting position, the pulley 201 and the guide rail 102 are slidingly assembled. When the material roller 2 is replaced, the lifting assembly moves the roller changing arm 4 to the same horizontal height as the mounting position, pushes the material roller 2 to move on the guide rail 102, slides out of the mounting position, and makes the outer ring wall of the material roller 2 abut against the top wall of the roller changing arm 4. Through the rolling of the outer ring wall of the material roller 2 on the roller changing arm 4 into the arc-shaped groove 401, the lifting assembly moves the roller changing arm 4 to the switching position for material roller replacement, thereby completing the disassembly of the material roller 2. After the material roller 2 is removed from the roller changing arm 4, a new material roller 2 provided with a new film roll is placed in the arc-shaped groove 401, and then the lifting assembly moves the roller changing arm 4 to the same horizontal height as the mounting position, pushes the material roller 2 to move into the mounting position, thereby completing the installation of the material roller 2. Through the connection of the two ends of the material roller 2 with the pulley 201, the pulley 201 and the guide rail 102 are slidingly assembled, the smoothness and accuracy of the movement are improved, the pushing force of the operator is reduced, the installation time waste caused by jamming is reduced, and the quick and labor-saving roll changing operation is realized. At the same time, the guide rail 102 guides and limits the pulley 201, improves the safety and reliability of the roll changing process.

[0040] In the process of the bag making machine running, the material roller 2 needs to be stably assembled on the rack 1 to realize the normal unwinding of the film roll. In order to limit the material roller 2 located in the installation station, and facilitate the replacement of the material roller 2, the embodiment further comprises a pneumatic cylinder 103 and a limiting pin 104. The pneumatic cylinder 103 is assembled on the rack 1 and is used to push the limiting pin 104 to move back and forth towards the installation station. The limiting pin 104 is used to abut against the outer ring wall of the pulley 201. Specifically, the fixed end of the pneumatic cylinder 103 is assembled on the rack 1 and located vertically above the installation slot 101. The pushing end of the pneumatic cylinder 103 is connected with the limiting pin 104. The limiting pin 104 moves vertically up and down towards the guide rail 102. When the material roller 2 is located in the assembly station and the roller abuts against the inner side wall of the installation slot 101, the pneumatic cylinder 103 pushes the limiting pin 104 to move downward, so that the limiting pin 104 abuts against the side of the roller away from the inner side wall of the installation, thereby completing the limiting and locking of the material roller 2. Conversely, the pneumatic cylinder 103 drives the limiting pin 104 to move upward, so that the material roller 2 can slide along the guide rail 102. The limiting pin 104 mechanism driven by the pneumatic cylinder 103 limits the material roller 2, which improves the stability of the film unwinding. Secondly, the locking and releasing of the limiting pin 104 are controlled by the pneumatic cylinder 103, which solves the problem of inconvenient and low efficiency of the traditional manual bolt operation, improves the automation degree and operation efficiency of the roll changing process, reduces the labor intensity of the operator, and reduces the time required for roll changing.

[0041] In order to improve the stability of the sliding of the sliding rail 305 and the guide rail 102, and the reliability of the locking of the limiting pin 104 to the pulley 201, in the specific structure of the pulley 201, the outer ring wall of the pulley 201 is provided with a V-shaped groove 2011 along the circumference thereof. The guide rail 102 is provided with a V-shaped protrusion corresponding to the sliding rail 305. When the limiting pin 104 moves downward, the limiting pin 104 abuts against the inner wall of the V-shaped groove 2011. By designing the cooperation of the V-shaped groove 2011 of the pulley 201 and the V-shaped protrusion of the guide rail 102, the guiding accuracy and stability of the horizontal movement of the material roller 2 are improved, which is beneficial to realize the fast and accurate reciprocating movement of the material roller 2 between the installation station and the roller changing arm 4. Secondly, by designing the abutting mode of the limiting pin 104 and the inner wall of the V-shaped groove 2011, the problem of small contact area and easy slipping when the surface of the cylindrical pulley 201 is locked is solved, the reliability and firmness of the locking are improved, and the stability of the film roll unwinding process is guaranteed.

[0042] The included angle between the inner walls of the V-shaped groove 2011 is an included angle a, and the included angle a is 90°±1°.

[0043] In order to make the limiting pin 104 limit the material roller 2, the material roller 2 can rotate smoothly, so that the film on the material roller 2 can be smoothly unwound, the embodiment further comprises a bearing, the bearing is connected to the two ends of the material roller 2, specifically, the inner ring of the bearing is connected to the outer ring wall of the material roller 2, and the outer ring of the bearing is connected to the inner wall of the pulley 201, so that when the limiting pin 104 limits the pulley 201, the material roller can rotate and unwind.

[0044] Further, in order to improve the assembly stability of the material roller 2, the pulley 201 is further provided with a limiting groove 2021, the limiting groove 2021 is recessed along the radial direction of the pulley 201 from the bottom wall of the V-shaped groove 2011, the inner side wall of the mounting groove 101 is provided with an arc-shaped portion 1011, the arc-shaped portion 1011 is matched with the inner bottom wall of the arc-shaped groove 401, when the limiting pin 104 moves downward, the arc-shaped portion 1011 abuts against the inner bottom wall of the limiting groove 2021, through the face contact between the inner bottom wall of the limiting groove 2021 and the arc-shaped portion 1011, the carrying capacity and stability of the locking state are improved, which is beneficial to ensure the operation safety.

[0045] In order to make the inner bottom wall of the limiting groove 2021 abut against the arc-shaped portion 1011 when the material roller is pushed into the mounting station, the cylinder 103 pushes the positioning pin to move downward to lock the material roller, in order to facilitate operation, the embodiment further comprises a controller, a control panel and a first proximity switch 202, an infrared sensor is mounted on the rack 1 and is used for detecting whether the pulley 201 is in place, the first proximity switch 202 is located below the mounting groove 101, the first proximity switch 202 is electrically connected with the input end of the controller and is used for inputting the sensing signal, the output end of the controller is electrically connected with the cylinder 103 and is used for controlling the extension and retraction movement of the cylinder 103, the controller is electrically connected with the control panel, and the control panel is used for manually inputting instructions, when the sensor detects that the pulley 201 slides into the mounting groove 101, the processor controls the cylinder 103 to extend, and the positioning pin locks the material roller, when the material roller is replaced, the operator controls the cylinder 103 to retract through the control panel, so that the material roller 2 is moved out of the mounting station.

[0046] In an embodiment, in order to improve the sensing accuracy of the first proximity switch 202, the material roller 2 is connected with a sensing wheel, the sensing wheel is located outside the axis of the pulley, that is, away from the side of the film roll, and the first proximity switch 202 is mounted on the outer side wall of the rack 1.

[0047] In order to improve the safety and reliability of the material roller 2 during the lifting process of the roller changing arm 4, the roller changing arm 4 is further provided with a limiting hook 402, the limiting hook 402 is protruded upward from the top wall of the roller changing arm 4, and the limiting hook 402 is located away from the rack 1 on the side of the arc-shaped groove 401, which improves the safety and reliability of the material roller 2 during the lifting process, limits the material roller 2 through the limiting hook 402, which is beneficial to simplify the film changing process to pushing out-lifting-pushing in operation, thereby improving the replacement efficiency of the material roller 2.

[0048] Further, in order to improve the stability of the material roller 2 in the lifting process, the roll changing arm 4 is also provided with a limiting protrusion 403, the limiting protrusion 403 is upwardly protruding from the top wall of the roll changing arm 4, and the limiting hook 402 is provided with a slope portion 4031 on the side of the arc-shaped groove 401 close to the rack 1. By providing the slope portion 4031, when the material roller 2 moves from the roll changing arm 4 to the installation station, it has a small range of acceleration effect. Because when pushing in, the material roller 2 is provided with a film roll, which is heavy, which helps to improve the smoothness of the pushing in. When the material roller 2 is pushed out from the installation station, the slope portion 4031 can also facilitate the movement of the material roller 2 due to the smaller weight.

[0049] In order to realize the lifting of the roll changing arm 4, in the specific structure of the lifting assembly 3, the lifting assembly 3 includes a fixed seat 301, a chain 302, two groups of sprockets 304, the sprockets 304 are vertically spaced up and down along the vertical direction of the rack 1, the chain 302 is sleeved on the two groups of sprockets 304 for chain transmission, one side of the fixed seat 301 is connected with the chain 302, and the other side of the fixed seat 301 is connected with the roll changing arm 4. Among them, the chain 302 is a single row roller chain, and the two groups of sprockets 304 are respectively a driving sprocket 304 and a driven sprocket 304. By driving the sprocket 304, the chain 302 is moved, and then the roll changing arm 4 is lifted. The lifting assembly is designed by the chain transmission structure of the sprocket 304 and the chain 302, which improves the stability and carrying capacity of the lifting process, reduces the risk of positioning error caused by slipping, and is beneficial to the stable lifting of heavy material rolls and improves the stability of the lifting movement of the roll changing arm 4.

[0050] In order to improve the smoothness of the sliding of the roll changing arm 4 and the rack, the lifting assembly 3 further includes a sliding rail 305 and a sliding block 306. The sliding rail 305 is connected with the rack 1, one side of the sliding block 306 is connected with the roll changing arm 4, and the other side of the sliding block 306 is slidingly assembled with the sliding rail 305. Through the sliding pair of the sliding rail 305 and the sliding block 306, the problem of transverse swing of the roll changing arm 4 in the lifting process caused by the chain 302 transmission is solved, the verticality and stability of the lifting movement are improved, which is beneficial to realize the stable lifting of the material roller 2 and improve the smoothness of the lifting sliding of the roll changing arm 4.

[0051] Among them, the sliding rail 305 is provided with two groups, and the two groups of sliding rails 305 are arranged on the longitudinal sides of the chain 302.

[0052] When the material roller 2 is placed on the roll changing arm 4, the main stress is on one side of the arc-shaped groove 401. Therefore, the end of the roll changing arm 4 away from the arc-shaped groove 401 is provided with two groups of sliding blocks 306 and the same group of sliding rails 305 for sliding assembly, so as to improve the stability of the lifting movement of the roll changing arm 4.

[0053] In terms of the specific structure of the lifting assembly 3 for driving the two groups of roll changing arms 4, the embodiment further comprises a motor 5, a transmission rod 501, and two groups of lifting assemblies 3 corresponding to the roll changing arms 4. The transmission rod 501 is used to connect the sprockets 304 of the two groups of lifting assemblies 3. Specifically, the transmission rod 501 is used to connect the driving sprockets 304 of the two groups of lifting assemblies 3. The driving sprockets 304 are arranged close to the bottom of the rack 1. The motor 5 is assembled with the rack 1 and is used to rotate the transmission rod 501. Specifically, the fixed end of the motor 5 is connected with the rack 1, and the rotating end of the motor 5 is connected with the transmission rod 501. The motor 5 synchronously drives the two driving sprockets 304 through the transmission rod 501, thereby improving the synchronization of the two lifting assemblies 3. This helps to improve the consistency and stability of the lifting of the left and right roll changing arms 4, thereby realizing stable and reliable automatic roll changing. In addition, the rotation of the motor 5 enables the roll changing arms 4 to move back and forth between the installation station and the switching station.

[0054] Since the driving chain 302 is located at the bottom of the rack 1, it occupies the space for the vertical downward movement of the roll changing arm 4. In order to make the roll changing arm 4 lower, i.e., the switching station closer to the ground, the bottom wall of the roll changing arm 4 is provided with a avoiding groove 404. When the roll changing arm 4 is lowered to the vertical lowest position, it is the switching station. At this time, the transmission rod 501 is located in the avoiding groove 404.

[0055] In the process of driving the roll changing arm 4 to move up and down by the lifting assembly 3, in order to enable the roll changing arm 4 to start and stop at the switching station and the installation station, the lifting assembly 3 further comprises a second proximity switch 307. The second proximity switch 307 is installed on the inner side wall of the rack 1 and is used to detect the end wall of the roll changing arm 4. The end wall of the roll changing arm 4 is connected with a sensing block. The sensing block is arranged corresponding to the second proximity switch 307. The second proximity switch 307 is electrically connected with the controller and is used to input the in-place signal of the roll changing arm 4. The controller is electrically connected with the motor and is used to output the start and stop signal of the motor. The second proximity switch 307 is provided with multiple groups relative to the switching station and the installation station. When the roll changing arm 4 needs to move to the installation station, the operator inputs the operation instruction on the control panel. When the second proximity switch 307 inputs the signal to the controller, the motor is controlled to stop rotating, so that the position of the roll changing arm 4 is maintained. When the roll changing arm reaches the switching station, the corresponding operation is performed in the same way. Of course, the specific position height of the roll changing arm 4 at the installation station and the switching station is adjusted adaptively according to the actual production needs.

[0056] Embodiment 2: as shown in Figures 1-9 A bag making machine comprising the film lifting and roll changing device of embodiment 1 further comprises a bag making machine body. The lifting and changing device is located on the feeding side of the bag making machine body and is used for feeding the film roll. The installation station is provided with two groups and is used for installing the upper roll and the lower roll, respectively.

[0057] Two groups of material rollers 2 are provided, and the two groups of material rollers 2 are respectively upper rollers and lower rollers.

[0058] The first proximity switch 202 is provided with two groups, and the two groups of first proximity switches 202 are respectively arranged corresponding to two groups of installation workstations, and are respectively used for detecting the arrival signals of the upper rollers and the lower rollers. The first proximity switch 202 is located below the bottom wall of the installation groove 101.

[0059] The second proximity switch 307 is provided with three groups, and two groups of second proximity switches 307 are respectively arranged corresponding to two groups of installation workstations, and are respectively used for detecting the signals that the roller changing arm 4 reaches the upper roller installation workstation and the lower roller installation workstation. Another group of second proximity switches 307 is arranged corresponding to the switching workstation, and is used for detecting the signal that the roller changing arm reaches the switching workstation. The second proximity switch 307 is located on the side of the roller changing arm 4 away from the limiting hook 402.

[0060] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A film lifting and changing device, comprising a frame, a lifting assembly, and a changing roller arm, wherein the frame is provided with mounting stations for installing material rollers, and multiple sets of mounting stations are arranged at vertical intervals along the frame; the bottom of the frame is also provided with a changing station for switching material rollers; the lifting assembly is mounted on the side wall of the frame and is used to drive the changing roller arm to move back and forth between the mounting stations and the changing station; the top of the changing roller arm is provided with an arc-shaped groove for placing the material roller, characterized in that: It also includes pulleys and guide rails. The frame has an installation groove to form the installation station. The installation groove is recessed from the outside toward the longitudinal side wall of the frame. The pulley is shaft-connected to the material roller. The guide rail is connected to the top wall of the installation groove. The pulley and the guide rail are adapted to each other.

2. The film lifting and changing device according to claim 1, characterized in that: The roller changing arms are provided in two sets, and are respectively located on the inner side of the two opposing side walls of the frame, while the arc-shaped groove is located on the outer side of the longitudinal side wall of the frame.

3. The film lifting and changing device according to claim 1, characterized in that: A cylinder and a limiting pin are provided. The cylinder is mounted on the frame and is used to push the limiting pin to move back and forth toward the installation position. The limiting pin is used to abut against the outer ring wall of the pulley.

4. A film lifting and changing device according to claim 3, characterized in that: The outer ring wall of the pulley is provided with a V-shaped groove along its circumference. When the limiting pin moves down, the limiting pin abuts against the inner wall of the V-shaped groove.

5. A film lifting and changing device according to claim 4, characterized in that: The pulley is also provided with a limiting groove, which is recessed radially from the bottom wall of the V-shaped groove along the pulley. The inner side wall of the mounting groove is provided with an arc-shaped part, and when the limiting pin moves down, the arc-shaped part abuts against the inner bottom wall of the limiting groove.

6. A film lifting and changing device according to claim 4, characterized in that: The included angle between the inner walls of the V-shaped groove is angle α, which is 90°±1°.

7. A film lifting and changing device according to claim 2, characterized in that: The lifting assembly includes a fixed base, a chain, and two sets of sprockets. The sprockets are arranged vertically at intervals along the frame. The chain is sleeved on the two sets of sprockets. One side of the fixed base is connected to the chain, and the other side of the fixed base is connected to the roller changing arm.

8. A film lifting and changing device according to claim 7, characterized in that: The lifting assembly also includes a slide rail and a slider. The slide rail is connected to the frame, one side of the slider is connected to the roller changing arm, and the other side of the slider is slidably assembled with the slide rail.

9. A film lifting and changing device according to claim 7 or 8, characterized in that: It also includes a motor and a transmission rod. The lifting assembly is provided in two sets corresponding to the roller changing arm. The transmission rod is used to connect the sprockets of the two sets of lifting assemblies. The motor is assembled with the frame and is used to rotate the transmission rod.

10. A bag-making machine, characterized in that: The invention includes a film lifting and changing device as described in any one of claims 1 to 9, and further includes a bag making machine body. The film lifting and changing device is located on the feeding side of the bag making machine body and is used for feeding film rolls. The installation station is provided with two sets, which are respectively used for installing the upper roller and the lower roller.

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