Bag opening device of packaging machine

Abstract

A bag opening device of a packaging machine comprises a rack, a bag opening base, an adsorption device, a first feeding plate, a second feeding plate, a first opening mechanism and a second opening mechanism, and the adsorption device comprises a first bag suction nozzle, a second bag suction nozzle and a bag suction nozzle lifting mechanism capable of driving the two bag suction nozzles to ascend and descend. The bag opening device is characterized by further comprising a first left-right translation seat and a second left-right translation seat, and a left-right translation mechanism capable of driving the first left-right translation seat and the second left-right translation seat to get close to each other or get away from each other in the left-right direction is arranged on the bag opening base; the first feeding plate, the first opening mechanism and the first bag suction nozzle are all installed on the first left-right translation seat, and the second feeding plate, the second opening mechanism and the second bag suction nozzle are all installed on the second left-right translation seat. According to the utility model, the positions of the left and right parts can be conveniently and quickly adjusted, so that the distance between the corresponding parts on the left and right sides meets the production requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to packing machinery, concretely relates to a bag opening device of packing machine. BACKGROUND

[0002] The utility model discloses a kind of bag opening devices of full-automatic paper diaper packaging production line, including bag opening base, suction device, first opening mechanism and second opening mechanism, first opening mechanism, second opening mechanism, suction device are all installed on bag opening base, first opening mechanism, second opening mechanism are respectively at the left and right sides of bag opening base, suction device is at the front of first opening mechanism, second opening mechanism;The first opening mechanism, second opening mechanism all include swing mechanism, movable seat, upper bag opening plate, lower bag opening plate and drive upper bag opening plate, lower bag opening plate to open-close mechanism that makes up and down open-close;Swing mechanism is installed on the bag opening base;Movable seat is installed on the power output end of swing mechanism;Open-close mechanism is installed on movable seat;The rear end of upper bag opening plate, lower bag opening plate is connected with open-close mechanism.The swing mechanism includes swing cylinder, swing pivot and swing connecting rod, swing pivot and swing cylinder are all installed on the bag opening base, one end of swing connecting rod is connected with swing pivot, the middle part of swing cylinder's piston rod is connected with swing connecting rod, and movable seat is installed on the second end of swing connecting rod.The expansion of swing cylinder piston rod, swing connecting rod is rotated around swing pivot, to realize the swing of movable seat.The open-close mechanism includes support, open-close cylinder, open-close pivot and connecting piece;Support is installed on the movable seat;Open-close pivot is rotatably installed on the upper end of support;Connecting piece is fixedly installed on open-close pivot;Open-close cylinder is installed on support, and the piston rod of open-close cylinder is hinged with connecting piece;The rear end of upper bag opening plate is connected with connecting piece;The rear end of lower bag opening plate is connected with support.The above-mentioned suction device includes two suction discs (suction bag mouth) and two suction disc lifting mechanisms for driving suction disc to lift, the power output end of suction disc lifting mechanism is connected with suction disc, suction disc lifting mechanism drives suction disc to descend and suck the upper side of packaging bag, and then drives suction disc to ascend, opens the bag mouth of packaging bag, when upper bag opening plate, lower bag opening plate are inserted into bag mouth, suction disc releases the suction to the upper side of packaging bag.

[0003] Before the above bag opening device is produced, the spacing between the first opening mechanism and the second opening mechanism needs to be adjusted (for example, using the first adjusting mechanism and the second adjusting mechanism) according to the size of the bag opening of the packaging bag, and the spacing between the two suction cups (bag suction nozzles) needs to be adjusted. In addition, a first feeding plate and a second feeding plate are usually respectively arranged at the rear side of the first opening mechanism and the second opening mechanism, and the gap between the first feeding plate and the second feeding plate constitutes a feeding channel. Before production, the spacing between the first feeding plate and the second feeding plate also needs to be adjusted according to the size of the bag opening of the packaging bag. Moreover, the positions of the left opening mechanism, the left suction cup (bag suction nozzle) and the left feeding plate need to correspond to the positions of the right opening mechanism, the right suction cup (bag suction nozzle) and the right feeding plate after adjustment. Since the above various spacing adjustments are performed respectively, and the positions of the left components need to correspond to each other and the positions of the right components need to correspond to each other after adjustment, the operation is very cumbersome, time-consuming and laborious. Content of the utility model

[0004] The technical problem to be solved by the utility model is to provide a bag opening device of a packaging machine, which can conveniently and quickly adjust the positions of the left and right components, so that the spacing between the corresponding components on the left and right sides meets the production requirements. The technical scheme adopted is as follows.

[0005] A bag opening device of a packaging machine, comprising a rack, a bag opening base, a suction device, a first feeding plate, a second feeding plate, a first opening mechanism and a second opening mechanism, wherein the bag opening base is installed on the rack, the first feeding plate and the second feeding plate are arranged side by side on the left and right, the first opening mechanism and the second opening mechanism are arranged side by side on the left and right, the suction device comprises a first bag suction nozzle, a second bag suction nozzle and a bag suction nozzle lifting mechanism capable of driving the two bag suction nozzles to lift, the first bag suction nozzle and the second bag suction nozzle are arranged side by side on the left and right, and the bag opening device further comprises a first left-right translation seat and a second left-right translation seat, wherein the bag opening base is provided with a left-right translation mechanism capable of driving the first left-right translation seat and the second left-right translation seat to move closer to or farther away from each other in the left-right direction; the first feeding plate, the first opening mechanism and the first bag suction nozzle are all installed on the first left-right translation seat, and the second feeding plate, the second opening mechanism and the second bag suction nozzle are all installed on the second left-right translation seat.

[0006] The first feeding plate, the first opening mechanism and the first bag suction nozzle are installed on the first left-right translation seat, and the second feeding plate, the second opening mechanism and the second bag suction nozzle are installed on the second left-right translation seat. When the interval needs to be adjusted (for example, the interval needs to be adjusted according to the size of the bag opening of the packaging bag), the first left-right translation seat and the second left-right translation seat are driven by the left-right translation mechanism to move towards each other or away from each other in the left-right direction, thereby adjusting the interval between the first opening mechanism and the second opening mechanism, the interval between the first feeding plate and the second feeding plate, and the interval between the first bag suction nozzle and the second bag suction nozzle at one time. The interval between the corresponding components on the left and right sides meets the production requirements, and the interval between the corresponding components on the left and right sides is adjusted synchronously, which is convenient and fast. Moreover, before and after adjustment, the relative positions of the first feeding plate, the first opening mechanism and the first bag suction nozzle on the first left-right translation seat remain unchanged, and the relative positions of the second feeding plate, the second opening mechanism and the second bag suction nozzle on the second left-right translation seat remain unchanged, and usually no recalibration is required.

[0007] When the bag opening device works, the bag feeding device sends the packaging bag to the lower side of the suction device, the suction device sucks the upper side of the packaging bag to open the bag opening of the packaging bag, the first opening mechanism and the second opening mechanism are inserted into the bag opening of the packaging bag (after the first opening mechanism and the second opening mechanism are inserted into the bag opening, the suction device can release the suction on the upper side of the packaging bag), so as to open the bag opening of the packaging bag to a suitable width and height; then the pusher mechanism pushes the sheet material (for example, a stack of paper diapers after compaction), and the sheet material enters the packaging bag through the gap between the first feeding plate and the second feeding plate, and then through the gap between the first opening mechanism and the second opening mechanism.

[0008] In a preferred solution, the bag suction nozzle lifting mechanism comprises a bag suction nozzle horizontal rod, a first bag suction nozzle sliding block, a second bag suction nozzle sliding block, a first bag suction nozzle vertical rod, a second bag suction nozzle vertical rod, a first vertical rod guide block and a second vertical rod guide block. A bag suction nozzle horizontal rod lifting driving mechanism is arranged on the rack to drive the bag suction nozzle horizontal rod to lift. The bag suction nozzle horizontal rod is provided with a left-right oriented bag suction nozzle horizontal guide rail. The first bag suction nozzle sliding block and the second bag suction nozzle sliding block are both installed on the bag suction nozzle horizontal guide rail and can move along the bag suction nozzle horizontal guide rail. The first bag suction nozzle vertical rod is connected with the first bag suction nozzle sliding block. The first bag suction nozzle is installed on the upper end of the first bag suction nozzle vertical rod. The second bag suction nozzle vertical rod is connected with the second bag suction nozzle sliding block. The second bag suction nozzle is installed on the upper end of the second bag suction nozzle vertical rod. The first vertical rod guide block is installed on the first left-right translation seat. The first vertical rod guide block is provided with an up-down oriented first vertical rod guide slot or a first vertical rod guide hole. The first bag suction nozzle vertical rod is in the first vertical rod guide slot or the first vertical rod guide hole. The first bag suction nozzle vertical rod can lift relative to the first vertical rod guide block. The second vertical rod guide block is installed on the second left-right translation seat. The second vertical rod guide block is provided with an up-down oriented second vertical rod guide slot or a second vertical rod guide hole. The second bag suction nozzle vertical rod is in the second vertical rod guide slot or the second vertical rod guide hole. The second bag suction nozzle vertical rod can lift relative to the second vertical rod guide block. The bag suction nozzle horizontal rod lifting driving mechanism is used to drive the bag suction nozzle horizontal rod to lift, so as to drive the first bag suction nozzle and the second bag suction nozzle to lift simultaneously through the first bag suction nozzle vertical rod and the second bag suction nozzle vertical rod. When the first left-right translation seat moves in the left-right direction, the first bag suction nozzle vertical rod, the first bag suction nozzle and the first bag suction nozzle sliding block are moved together through the first vertical rod guide slot (or the first vertical rod guide hole). When the second left-right translation seat moves in the left-right direction, the second bag suction nozzle vertical rod, the second bag suction nozzle and the second bag suction nozzle sliding block are moved together through the second vertical rod guide slot (or the second vertical rod guide hole). After the interval between the first left-right translation seat and the second left-right translation seat is adjusted, that is, after the interval between the first bag suction nozzle and the second bag suction nozzle is adjusted, the first bag suction nozzle sliding block and the second bag suction nozzle sliding block can be fixed with the bag suction nozzle horizontal rod through locking components (such as bolts or screws), so that the bag suction nozzle horizontal rod lifting driving mechanism can more stably drive the bag suction nozzle horizontal rod, the first bag suction nozzle sliding block, the second bag suction nozzle sliding block, the first bag suction nozzle vertical rod, the second bag suction nozzle vertical rod, the first bag suction nozzle and the second bag suction nozzle to lift together.

[0009] More preferably, the suction nozzle horizontal rod lifting driving mechanism comprises a suction nozzle horizontal rod lifting driving motor, a first rotating shaft, a first connecting rod and a second connecting rod. The first rotating shaft is rotatably installed on the rack and arranged in the horizontal direction. The first connecting rod is connected to the first rotating shaft at one end, and hingedly connected to the second connecting rod at the other end. The second connecting rod is hingedly connected to the suction nozzle horizontal rod at the other end. The power output shaft of the suction nozzle horizontal rod lifting driving motor is in transmission connection with the first rotating shaft. The suction nozzle horizontal rod lifting driving mechanism can also adopt a gas cylinder, or a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0010] In another preferred embodiment, the suction nozzle lifting mechanism comprises a first suction nozzle lifting driving mechanism capable of driving the first suction nozzle to lift, and a second suction nozzle lifting driving mechanism capable of driving the second suction nozzle to lift. The first suction nozzle lifting driving mechanism is installed on the first left-right translation seat, and the power output end of the first suction nozzle lifting driving mechanism is connected to the first suction nozzle. The second suction nozzle lifting driving mechanism is installed on the second left-right translation seat, and the power output end of the second suction nozzle lifting driving mechanism is connected to the second suction nozzle. The first suction nozzle lifting driving mechanism and the second suction nozzle lifting driving mechanism can adopt a gas cylinder, of which the piston rod is upward or downward, and the piston rod is the power output end. The first suction nozzle lifting driving mechanism and the second suction nozzle lifting driving mechanism can also adopt a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0011] In a preferred embodiment, the left-right translation mechanism comprises a first bag opening translation guide rail, a bag opening translation screw and two bag opening translation nuts. The first bag opening translation guide rail is arranged on the bag opening base and extends in the left-right direction. The first left-right translation seat and the second left-right translation seat are respectively provided with a first sliding block in sliding cooperation with the first bag opening translation guide rail. The bag opening translation screw is rotatably installed on the bag opening base in the horizontal direction. The bag opening translation screw is provided with a first forward threaded section and a first reverse threaded section. The two bag opening translation nuts are respectively screwed with the first forward threaded section and the first reverse threaded section. The two bag opening translation nuts are respectively connected to the first left-right translation seat and the second left-right translation seat. The first bag opening translation guide rail is usually provided with a plurality of (such as two or three) guide rails. The first left-right translation seat is provided with a plurality of first sliding blocks. Each first bag opening translation guide rail corresponds to one or more first sliding blocks on the first left-right translation seat. The second left-right translation seat is provided with a plurality of first sliding blocks. Each first bag opening translation guide rail corresponds to one or more first sliding blocks on the second left-right translation seat. By rotating the bag opening translation screw, the two bag opening translation nuts can be driven to move closer to each other or move away from each other, so as to move the first left-right translation seat and the second left-right translation seat closer to each other or move the first left-right translation seat and the second left-right translation seat away from each other.

[0012] In one specific embodiment, the left-right translation mechanism further comprises a left-right translation drive motor, which is installed on the bag opening base, and the bag opening translation screw is in transmission connection with the power output shaft of the left-right translation drive motor. The left-right translation drive motor drives the bag opening translation screw to rotate forward or reverse, which drives the two bag opening translation nuts to move closer to each other or move away from each other, so that the first left-right translation seat and the second left-right translation seat move closer to each other or move away from each other.

[0013] In another specific embodiment, the left-right translation mechanism further comprises a first adjusting hand wheel, which is installed on one end of the bag opening translation screw. By manually rotating the first adjusting hand wheel, the bag opening translation screw is driven to rotate forward or reverse, which drives the two bag opening translation nuts to move closer to each other or move away from each other, so that the first left-right translation seat and the second left-right translation seat move closer to each other or move away from each other.

[0014] In another specific embodiment, the left-right translation mechanism further comprises a left-right translation drive motor and a first adjusting hand wheel, the left-right translation drive motor is installed on the bag opening base, one end of the bag opening translation screw is in transmission connection with the power output shaft of the left-right translation drive motor, and the first adjusting hand wheel is installed on the other end of the bag opening translation screw. The bag opening translation screw is driven to rotate forward or reverse by selecting the left-right translation drive motor or manually rotating the first adjusting hand wheel. The operator can adjust in an electric or manual mode, and the adjustment mode is more flexible.

[0015] In a more preferred embodiment, the first left-right translation seat and the second left-right translation seat are respectively provided with locking structures matched with the first bag opening translation guide rails. When the locking structures are locked, they are fixed at the positions of the corresponding first bag opening translation guide rails, thereby fixing the positions of the first left-right translation seat and the second left-right translation seat.

[0016] Further preferably, the locking structure comprises a locking slider, a locking bolt and a locking nut. The locking slider comprises a front clamping portion and a rear clamping portion, the upper end of the front clamping portion is connected to the upper end of the rear clamping portion, the middle portion of the front clamping portion and the middle portion of the rear clamping portion are provided with a gap, the lower portion of the front clamping portion and the lower portion of the rear clamping portion are respectively provided with a sliding groove matched with the first bag opening translation rail, the middle portion of the front clamping portion is provided with a front-to-back through hole, the middle portion of the rear clamping portion is provided with a rear-to-front through hole, the front-to-back through hole and the rear-to-front through hole are aligned with each other, the rod of the locking bolt passes through the front-to-back through hole and the rear-to-front through hole, and the head of the locking bolt and the locking nut are respectively located on the front and rear sides of the locking slider. When the first left-right translation seat and the second left-right translation seat are at the desired position, the connection between the locking bolt and the locking nut is tightened, so that the head of the locking bolt and the locking nut jointly apply clamping force to the middle portion of the front clamping portion and the middle portion of the rear clamping portion. At this time, the gap is narrowed, the sliding groove walls of the lower portion of the front clamping portion and the lower portion of the rear clamping portion clamping the corresponding first bag opening translation rail, so that the locking structure and the first left-right translation seat (or the second left-right translation seat) are fixed in position with the corresponding first bag opening translation rail, thereby keeping the position of the first left-right translation seat and the second left-right translation seat on the bag opening base unchanged in subsequent work. When the position of the first left-right translation seat and the second left-right translation seat needs to be adjusted, the connection between the locking bolt and the locking nut is loosened, so that the head of the locking bolt and the locking nut no longer apply clamping force to the middle portion of the front clamping portion and the middle portion of the rear clamping portion. At this time, the sliding groove walls of the lower portion of the front clamping portion and the lower portion of the rear clamping portion no longer clamp the corresponding first bag opening translation rail, so that the locking structure can move along the first bag opening translation rail with the first left-right translation seat (or the second left-right translation seat).

[0017] In the preferred embodiment, the bag opening device further comprises a first front-to-back translation seat, a second front-to-back translation seat and a front-to-back translation mechanism. The front-to-back translation mechanism can drive the first front-to-back translation seat and the second front-to-back translation seat to translate forward and backward relative to the first left-right translation seat and the second left-right translation seat respectively. The first opening mechanism is installed on the first front-to-back translation seat, and the second opening mechanism is installed on the second front-to-back translation seat. In the production process, after the adsorption device adsorbs the upper side of the packaging bag to open the bag opening of the packaging bag, the first opening mechanism and the second opening mechanism are inserted into the bag opening of the packaging bag in the forward direction under the drive of the front-to-back translation mechanism, and then the bag opening of the packaging bag is opened to a suitable width and height. After filling the packaging bag with materials, the first opening mechanism and the second opening mechanism move backward under the drive of the front-to-back translation mechanism and exit from the bag opening of the packaging bag.

[0018] In a more preferable solution, the first left-right translation seat and the second left-right translation seat are each provided with a second bag opening translation guide rail extending in the front-rear direction; the first front-rear translation seat is provided with a second sliding block matched with the second bag opening translation guide rail on the first left-right translation seat, and the second front-rear translation seat is provided with a second sliding block matched with the second bag opening translation guide rail on the second left-right translation seat.

[0019] In a more preferable solution, the front-rear translation mechanism includes a front-rear translation driving motor, a second rotating shaft, a third connecting rod, a fourth connecting rod, and a translation seat crossbar. The second rotating shaft is rotatably installed on the bag opening base. One end of the third connecting rod is connected with the second rotating shaft, and the other end of the third connecting rod is hingedly connected with one end of the fourth connecting rod. The other end of the fourth connecting rod is hingedly connected with the translation seat crossbar. The power output shaft of the front-rear translation driving motor is in transmission connection with the second rotating shaft. The first front-rear translation seat and the second front-rear translation seat are connected with the translation seat crossbar. The relative positions between the first front-rear translation seat, the second front-rear translation seat, and the translation seat crossbar are adjustable. In a specific solution, the translation seat crossbar is provided with a third bag opening translation guide rail extending in the left-right direction. The first front-rear translation seat and the second front-rear translation seat are respectively provided with a third sliding block matched with the third bag opening translation guide rail. When the distance between the first opening mechanism and the second opening mechanism needs to be adjusted, the third sliding block on the first front-rear translation seat and the third sliding block on the second front-rear translation seat can move along the third bag opening translation guide rail. At this time, the first left-right translation seat, the first front-rear translation seat, and the first opening mechanism move together in the left-right direction, and the second left-right translation seat, the second front-rear translation seat, and the second opening mechanism also move together in the left-right direction. After the distance between the first opening mechanism and the second opening mechanism is adjusted, the first front-rear translation seat and the second front-rear translation seat are fixed with the translation seat crossbar through locking components (such as bolts or screws), so that the front-rear translation mechanism can more stably drive the translation seat crossbar, the first front-rear translation seat, and the second front-rear translation seat to move forward and backward together.

[0020] In another more preferable solution, the front-rear translation mechanism includes a first front-rear translation driving device capable of driving the first front-rear translation seat to move forward and backward relative to the first left-right translation seat, and a second front-rear translation driving device capable of driving the second front-rear translation seat to move forward and backward relative to the second left-right translation seat. The first front-rear translation driving device is installed on the first left-right translation seat, and the second left-right translation seat is installed on the second left-right translation seat. The first front-rear translation driving device and the second front-rear translation driving device can adopt a pneumatic cylinder. The piston rod of the pneumatic cylinder faces forward or backward, and the piston rod is connected with the first front-rear translation seat and the second front-rear translation seat. The first front-rear translation driving device and the second front-rear translation driving device can also adopt a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0021] In the preferred solution, the first and second bag opening mechanisms each comprise a bag opening mechanism support, a swing pivot, a movable seat, an upper bag opening plate, a lower bag opening plate, an opening and closing pivot, a first opening and closing link and a second opening and closing link. The swing pivot is rotatably installed on the bag opening mechanism support and extends vertically. The movable seat is installed on the swing pivot. The opening and closing pivot is rotatably installed on the movable seat and extends horizontally. The rear end of the upper bag opening plate is connected to the opening and closing pivot. The rear end of the lower bag opening plate is connected to the movable seat. The first end of the first opening and closing link is connected to the opening and closing pivot. The second end of the first opening and closing link is hingedly connected to the first end of the second opening and closing link. The second end of the second opening and closing link is hingedly connected to the bag opening mechanism support. The bag opening mechanism support is provided with a swing mechanism capable of driving the swing pivot to rotate. The first bag opening mechanism is installed on the first left-right translation seat via its bag opening mechanism support. The second bag opening mechanism is installed on the second left-right translation seat via its bag opening mechanism support (in the case where the bag opening device further comprises a first front-rear translation seat, a second front-rear translation seat and a front-rear translation mechanism, the first bag opening mechanism is installed on the first front-rear translation seat via its bag opening mechanism support, and the second bag opening mechanism is installed on the second front-rear translation seat via its bag opening mechanism support).

[0022] When the bag opening mechanism is in operation, the upper and lower bag opening plates of the first and second bag opening mechanisms are initially close to each other. After the bag conveying device conveys the packaging bag to the lower side of the suction device, the upper side of the packaging bag is sucked by the suction device to open the bag opening of the packaging bag, the upper and lower bag opening plates of the first and second bag opening mechanisms are inserted into the bag opening of the packaging bag and simultaneously swing outward around the swing pivot under the driving of the swing mechanism, so as to open the bag opening to the left and right directions. At the same time, the first end of the first opening and closing link changes its position (for example, it is closer to the second end of the second opening and closing link) due to the swing of the movable seat around the swing pivot. Thus, the second end of the first opening and closing link swings around the opening and closing pivot under the pushing action of the second opening and closing link, the opening and closing pivot rotates, thereby driving the front end of the upper bag opening plate to swing upward, the distance between the front end of the upper bag opening plate and the front end of the lower bag opening plate increases, and the bag opening of the packaging bag is opened to the upward and downward directions, so as to open the bag opening to a proper width and height.

[0023] In the more preferred solution, the second end of the first opening and closing link is hingedly connected to the first end of the second opening and closing link via a first spherical hinge, and the second end of the second opening and closing link is hingedly connected to the bag opening mechanism support via a second spherical hinge.

[0024] In the more preferred solution, the second opening and closing link is a length-adjustable rod.

[0025] In a further preferred embodiment, the second opening and closing link comprises a first connecting screw rod, a second connecting screw rod and a threaded tube, the first and second connecting screw rods are respectively provided with external threads and have opposite screw directions, the threaded tube is provided with internal threads at both ends matching the first and second connecting screw rods, the first connecting screw rod is hingedly connected to the second end of the first opening and closing link, and the second connecting screw rod is hingedly connected to the support of the opening and supporting mechanism. Preferably, the middle part of the threaded tube is symmetrically provided with two notches which can be matched with a wrench or the like, and when the length of the second opening and closing link needs to be adjusted, the two sides of the opening of the wrench are respectively inserted into the two notches, and then the threaded tube can be twisted to adjust the length of the second opening and closing link.

[0026] In a first preferred embodiment of the swing mechanism, the swing mechanism comprises a swing cylinder and a first swing link, the cylinder body of the swing cylinder is hingedly connected to the support of the opening and supporting mechanism, the first end of the first swing link is connected to the swing shaft or the movable seat, and the second end of the first swing link is hingedly connected to the piston rod of the swing cylinder. When the piston rod of the swing cylinder is extended or retracted, the swing shaft is driven to rotate through the first swing link, thereby realizing the swing of the movable seat, the upper bag opening plate and the lower bag opening plate.

[0027] In a second preferred embodiment of the swing mechanism, the swing mechanism comprises a swing cylinder, a first swing link, a second swing link and a third swing link, the cylinder body of the swing cylinder is hingedly connected to the support of the opening and supporting mechanism, the piston rod of the swing cylinder is provided with a hinged seat, the hinged seat is provided with a pin shaft, the first end of the first swing link is connected to the swing shaft or the movable seat, the second end of the first swing link is hingedly connected to the first end of the second swing link, the second end of the second swing link is provided with a circular pin hole matching the pin shaft and being in sleeve connection, the first end of the third swing link is hingedly connected to the support of the opening and supporting mechanism, and the second end of the third swing link is provided with a circular pin hole matching the pin shaft and being in sleeve connection. When the piston rod of the swing cylinder is extended or retracted, the swing shaft is driven to rotate through the second swing link and the first swing link, thereby realizing the swing of the movable seat, the upper bag opening plate and the lower bag opening plate, and the third swing link is used to move the hinged seat and the pin shaft along a predetermined trajectory.

[0028] In a further preferred embodiment of the second preferred embodiment of the swing mechanism, the support of the opening and supporting mechanism is provided with a limiting block in front of the hinged seat. When the piston rod of the swing cylinder is extended, the hinged seat contacts the limiting block when reaching a predetermined stroke and stops moving forward, so that the swing angles of the upper bag opening plate and the lower bag opening plate and the upward swing angle of the upper bag opening plate can be more accurately controlled. Preferably, the position of the limiting block in the front and back directions is adjustable.

[0029] In a more preferable solution, the bag opening edge clamping plate is provided on the opening mechanism support, and is located outside the upper bag opening plate. A clamping gap is formed between the front end of the bag opening edge clamping plate and the outer side of the upper bag opening plate. When the upper bag opening plate and the lower bag opening plate of the first opening mechanism and the second opening mechanism are inserted into the bag opening of the packaging bag, the left and right bag opening edges of the packaging bag enter the clamping gap of the first opening mechanism and the second opening mechanism. When the upper bag opening plate is swung outward by the driving of the swinging mechanism, the bag opening edges in the clamping gap are clamped by the outer side of the upper bag opening plate and the front end of the bag opening edge clamping plate, so that the bag opening position of the packaging bag is kept stable. Thus, when the subsequent pushing mechanism pushes the sheet material into the packaging bag, the sheet material can be smoothly pushed into the innermost part of the packaging bag, and the sheet material in the packaging bag can be more compact.

[0030] In a further preferable solution, a rubber-coated screw is installed at the front end of the bag opening edge clamping plate. The head of the rubber-coated screw is located on the side of the bag opening edge clamping plate facing the upper bag opening plate. The clamping gap is formed between the head of the rubber-coated screw and the outer side of the upper bag opening plate. The head of the rubber-coated screw is wrapped with a resilient material (such as polyurethane), which can buffer and increase the friction coefficient. When the upper bag opening plate is swung outward by the driving of the swinging mechanism, the bag opening edges are clamped by the outer side of the upper bag opening plate and the head of the rubber-coated screw.

[0031] In a still further preferable solution, a strip-shaped limiting hole is provided at the front end of the bag opening edge clamping plate. The screw rod of the rubber-coated screw passes through the strip-shaped limiting hole. A second locking nut is installed on the screw rod of the rubber-coated screw, and the second locking nut and the head of the rubber-coated screw clamp the front end of the bag opening edge clamping plate. By adjusting the position of the screw rod of the rubber-coated screw in the strip-shaped limiting hole, the position of the head of the rubber-coated screw can be adjusted, so that the clamped position of the bag opening edge can be adjusted. The strip-shaped limiting hole can be vertically oriented, so that the height position of the head of the rubber-coated screw can be adjusted.

[0032] In another still further preferable solution, a screw hole is provided at the front end of the bag opening edge clamping plate. The screw rod of the rubber-coated screw is screwed into the screw hole. By adjusting the screwing depth of the screw rod of the rubber-coated screw, the initial gap size between the head of the rubber-coated screw and the outer side of the upper bag opening plate can be adjusted, so that the clamping force when the outer side of the upper bag opening plate and the head of the rubber-coated screw clamp the bag opening edge can be adjusted.

[0033] Generally, the front end of the bag opening edge clamping plate is located at the rear side of the front end of the upper bag opening plate.

[0034] The utility model discloses a left-right translation mechanism drive first left-right translation seat and second left-right translation seat in left-right direction each other close or each other away, can complete the interval between first support open mechanism, second support open mechanism, the interval between first feeding plate and second feeding plate and the interval between two bag suction nozzles's adjustment once, make the interval between left and right two sides corresponding components meet production demand, and the interval between left and right two sides corresponding components adjusts synchronous, and the adjustment process is convenient and fast. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the structure schematic diagram of preferred embodiment 1 of the utility model (the state of larger left-right interval);

[0036] Figure 2 It is the structure schematic diagram of preferred embodiment 1 of the utility model (the state of smaller left-right interval);

[0037] Figure 3 It is Figure 1 The top view of bag opening device shown in (remove supporting plate 44, the state when first support open mechanism 5 and second support open mechanism 6 are driven to the front insertion bag mouth of packaging bag of front-back translation mechanism);

[0038] Figure 4 It is Figure 1 The top view of bag opening device shown in (remove supporting plate 44, the state when first support open mechanism 5 and second support open mechanism 6 are driven to the rear of front-back translation mechanism);

[0039] Figure 5 It is the structure schematic diagram of locking structure in preferred embodiment 1 of the utility model;

[0040] Figure 6 It is Figure 1 The structure schematic diagram of first support open mechanism in (initial state) shown in;

[0041] Figure 7 It is Figure 1 The structure schematic diagram of first support open mechanism in (the state of opening packaging bag mouth) shown in;

[0042] Figure 8 It is the structure schematic diagram of bag rubber screw installation in bag mouth edge clamping plate in preferred embodiment 1 of the utility model;

[0043] Figure 9 It is the structure schematic diagram of bag rubber screw installation in bag mouth edge clamping plate in preferred embodiment 2 of the utility model. DETAILED DESCRIPTION

[0044] Embodiment 1, as Figures 1 to 4As shown, the bag opening device of the packaging machine comprises a rack 1, a bag opening base 2, a suction device, a first feeding plate 3, a second feeding plate 4, a first opening mechanism 5, a second opening mechanism 6, a first left-right translation seat 7 and a second left-right translation seat 8; the bag opening base 2 is installed on the rack 1, the first feeding plate 3 and the second feeding plate 4 are arranged side by side, and the first opening mechanism 5 and the second opening mechanism 6 are arranged side by side; the suction device comprises a first bag suction nozzle 9, a second bag suction nozzle 10 and a bag suction nozzle lifting mechanism capable of driving the two bag suction nozzles (i.e. the first bag suction nozzle 9 and the second bag suction nozzle 10) to lift, and the first bag suction nozzle 9 and the second bag suction nozzle 10 are arranged side by side; the bag opening base 2 is provided with a left-right translation mechanism capable of driving the first left-right translation seat 7 and the second left-right translation seat 8 to move towards or away from each other in the left-right direction; the first feeding plate 3, the first opening mechanism 5 and the first bag suction nozzle 9 are all installed on the first left-right translation seat 7, and the second feeding plate 4, the second opening mechanism 6 and the second bag suction nozzle 10 are all installed on the second left-right translation seat 8.

[0045] In the embodiment, the suction bag nozzle lifting mechanism comprises a suction bag nozzle cross rod 11, a first suction bag nozzle sliding block 12, a second suction bag nozzle sliding block 13, a first suction bag nozzle vertical rod 14, a second suction bag nozzle vertical rod 15, a first vertical rod guide block 16 and a second vertical rod guide block 17. The rack 1 is provided with a suction bag nozzle cross rod lifting driving mechanism capable of driving the suction bag nozzle cross rod 11 to lift. The suction bag nozzle cross rod 11 is provided with a left-right oriented suction bag nozzle horizontal guide rail 18. The first suction bag nozzle sliding block 12 and the second suction bag nozzle sliding block 13 are both installed on the suction bag nozzle horizontal guide rail 18 and can move along the suction bag nozzle horizontal guide rail 18. The first suction bag nozzle vertical rod 14 is connected with the first suction bag nozzle sliding block 12. The first suction bag nozzle 9 is installed on the upper end of the first suction bag nozzle vertical rod 14. The second suction bag nozzle vertical rod 15 is connected with the second suction bag nozzle sliding block 13. The second suction bag nozzle 10 is installed on the upper end of the second suction bag nozzle vertical rod 15. The first vertical rod guide block 16 is installed on the first left-right translation seat 7. The first vertical rod guide block 16 is provided with an up-down oriented first vertical rod guide slot 19 (or a first vertical rod guide hole). The first suction bag nozzle vertical rod 14 is in the first vertical rod guide slot 19 (or the first vertical rod guide hole). The first suction bag nozzle vertical rod 14 can lift relative to the first vertical rod guide block 16. The second vertical rod guide block 17 is installed on the second left-right translation seat 8. The second vertical rod guide block 17 is provided with an up-down oriented second vertical rod guide slot 20 (or a second vertical rod guide hole). The second suction bag nozzle vertical rod 15 is in the second vertical rod guide slot 20 (or the second vertical rod guide hole). The second suction bag nozzle vertical rod 15 can lift relative to the second vertical rod guide block 17. The suction bag nozzle cross rod lifting driving mechanism is used to drive the suction bag nozzle cross rod 11 to lift, so that the first suction bag nozzle vertical rod 14 and the second suction bag nozzle vertical rod 15 are lifted simultaneously by the first suction bag nozzle sliding block 12 and the second suction bag nozzle sliding block 13 respectively. The first suction bag nozzle 9 and the second suction bag nozzle 10 are lifted simultaneously by the first suction bag nozzle vertical rod 14 and the second suction bag nozzle vertical rod 15. When the first left-right translation seat 7 moves in the left-right direction, the inner wall of the first vertical rod guide slot 19 (or the first vertical rod guide hole) applies a force to the first suction bag nozzle vertical rod 14, so that the first suction bag nozzle vertical rod 14, the first suction bag nozzle 9 and the first suction bag nozzle sliding block 12 move together. When the second left-right translation seat 8 moves in the left-right direction, the inner wall of the second vertical rod guide slot (or the second vertical rod guide hole) applies a force to the second suction bag nozzle vertical rod 15, so that the second suction bag nozzle vertical rod 15, the second suction bag nozzle 10 and the second suction bag nozzle sliding block 13 move together. After the interval between the first left-right translation seat 7 and the second left-right translation seat 8 is adjusted (i.e. after the interval between the first suction bag nozzle and the second suction bag nozzle is adjusted), the first suction bag nozzle sliding block and the second suction bag nozzle sliding block can be fixed with the suction bag nozzle cross rod by a locking component (such as a bolt or a screw), so that the suction bag nozzle cross rod lifting driving mechanism can more stably drive the suction bag nozzle cross rod, the first suction bag nozzle sliding block, the second suction bag nozzle sliding block, the first suction bag nozzle vertical rod, the second suction bag nozzle vertical rod, the first suction bag nozzle and the second suction bag nozzle to lift together.

[0046] The bag suction nozzle horizontal rod lifting driving mechanism comprises a bag suction nozzle horizontal rod lifting driving motor 21, a first rotating shaft 22, a first connecting rod 23 and a second connecting rod 24. The first rotating shaft 22 is rotatably installed on the frame 1 and arranged in a horizontal direction. The first connecting rod 23 is connected to the first rotating shaft 22 at one end, and the other end of the first connecting rod 23 is hingedly connected to one end of the second connecting rod 24. The other end of the second connecting rod 24 is hingedly connected to the bag suction nozzle horizontal rod 11 (in this embodiment, a vertical connecting rod 25 is fixedly installed on the bag suction nozzle horizontal rod 11, and the other end of the second connecting rod 24 is hingedly connected to the connecting rod 25). The power output shaft of the bag suction nozzle horizontal rod lifting driving motor 21 is in transmission connection with the first rotating shaft 22. The bag suction nozzle horizontal rod lifting driving mechanism can also adopt a gas cylinder, or a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0047] In this embodiment, the left-right translation mechanism comprises a first bag opening translation guide rail 26, a bag opening translation screw 27 and two bag opening translation nuts 28. The first bag opening translation guide rail 26 is arranged on the bag opening base 2 and extends in the left-right direction. The first left-right translation seat 7 and the second left-right translation seat 8 are respectively provided with a first sliding block 29 in sliding cooperation with the first bag opening translation guide rail 26. The bag opening translation screw 27 is rotatably installed on the bag opening base 2 in a horizontal direction. The bag opening translation screw 27 is provided with a first forward threaded section and a first reverse threaded section. The two bag opening translation nuts 28 are respectively screwed with the first forward threaded section and the first reverse threaded section. The two bag opening translation nuts 28 are respectively connected with the first left-right translation seat 7 and the second left-right translation seat 8. The first bag opening translation guide rail 26 is usually provided with a plurality of (such as two or three) first bag opening translation guide rails 26, which are parallel to each other. The first left-right translation seat 7 is provided with a plurality of first sliding blocks 29. Each first bag opening translation guide rail 26 corresponds to one or more first sliding blocks 29 on the first left-right translation seat 7. The second left-right translation seat 8 is provided with a plurality of first sliding blocks 29. Each first bag opening translation guide rail 26 corresponds to one or more first sliding blocks 29 on the second left-right translation seat 8. By rotating the bag opening translation screw 27, the two bag opening translation nuts 28 can be driven to move closer to or away from each other, so that the first left-right translation seat 7 and the second left-right translation seat 8 move closer to or away from each other. In this embodiment, the left-right translation mechanism further comprises a left-right translation driving motor 30 and a first adjusting hand wheel 31. The left-right translation driving motor 30 is installed on the bag opening base 2. One end of the bag opening translation screw 27 is in transmission connection with the power output shaft of the left-right translation driving motor 30. The first adjusting hand wheel 31 is installed on the other end of the bag opening translation screw 27. The left-right translation driving motor 30 can be selected to drive, or the first adjusting hand wheel 31 can be manually rotated to make the bag opening translation screw 27 rotate forward or reverse.

[0048] The first left-right translation seat 7 and the second left-right translation seat 8 are respectively provided with a locking structure 32 matched with the first bag opening translation guide rail 26 (when the first bag opening translation guide rail 26 is provided with a plurality of first bag opening translation guide rails 26, the locking structure 32 is matched with one of the first bag opening translation guide rails 26), and the locking structure 32 is fixed with the corresponding first bag opening translation guide rail 26 when locked, so as to fix the positions of the first left-right translation seat 7 and the second left-right translation seat 8. It is referred to Figure 5 The locking structure 32 comprises a locking sliding block 321, a locking bolt 322 and a locking nut 323. The locking sliding block 321 comprises a front clamping portion 3211 and a rear clamping portion 3212, the upper ends of the front clamping portion 3211 and the rear clamping portion 3212 are integrated, a gap 324 is formed between the middle portions of the front clamping portion 3211 and the rear clamping portion 3212, the lower portions of the front clamping portion 3211 and the rear clamping portion 3212 are respectively provided with a sliding groove 325 matched with the first bag opening translation guide rail 26, the middle portion of the front clamping portion 3211 is provided with a front-through hole 326 extending in the front-rear direction, the middle portion of the rear clamping portion 3212 is provided with a rear-through hole 327 extending in the front-rear direction, the front-through hole 326 and the rear-through hole 327 are aligned with each other, the rod portion 3221 of the locking bolt 322 passes through the front-through hole 326 and the rear-through hole 327, and the head portion 3222 of the locking bolt 322 and the locking nut 323 are respectively arranged on the front and rear sides of the locking sliding block 321. When the first left-right translation seat 7 and the second left-right translation seat 8 are at the required positions, the connection between the locking bolt 322 and the locking nut 323 is tightened, so that the head portion of the locking bolt 322 and the locking nut 323 jointly apply clamping force to the middle portions of the front clamping portion 3211 and the rear clamping portion 3212, at this time, the gap 324 is narrowed, the groove walls of the sliding grooves 325 of the lower portions of the front clamping portion 3211 and the rear clamping portion 3212 clamping the corresponding first bag opening translation guide rail 26, so that the locking structure 32 and the first left-right translation seat 7 (or the second left-right translation seat 8) are fixed with the corresponding first bag opening translation guide rail 26, thereby keeping the positions of the first left-right translation seat 7 and the second left-right translation seat 8 on the bag opening base 2 unchanged in subsequent work. When the positions of the first left-right translation seat 7 and the second left-right translation seat 8 need to be adjusted, the connection between the locking bolt 322 and the locking nut 323 is loosened, so that the head portion of the locking bolt 322 and the locking nut 323 no longer apply clamping force to the middle portions of the front clamping portion 3211 and the rear clamping portion 3212, at this time, the groove walls of the sliding grooves 325 of the lower portions of the front clamping portion 3211 and the rear clamping portion 3212 no longer clamp the corresponding first bag opening translation guide rail 26, so that the locking structure 32 can move along the first bag opening translation guide rail 26 with the first left-right translation seat 7 (or the second left-right translation seat 8). In order to facilitate operation, the head portion 3222 of the locking bolt 322 is provided with a handle 328, the locking nut 323 is fixedly installed on the outer wall of the locking sliding block 321 (for example, the locking nut 323 is welded on the rear outer wall of the locking sliding block 321), and the locking bolt 322 rotates when the handle 328 is rotated.

[0049] In the embodiment, the bag opening device further comprises a first front-rear translation seat 33, a second front-rear translation seat 34, and a front-rear translation mechanism capable of driving the first front-rear translation seat 33 and the second front-rear translation seat 34 to translate forward and backward relative to the first left-right translation seat 7 and the second left-right translation seat 8 respectively. The first opening mechanism 5 is installed on the first front-rear translation seat 33, and the second opening mechanism 6 is installed on the second front-rear translation seat 34. In the production process, after the upper side of the packaging bag is sucked up by the suction device to open the bag opening of the packaging bag, the first opening mechanism 5 and the second opening mechanism 6 are inserted into the bag opening of the packaging bag in the forward direction under the driving of the front-rear translation mechanism, and then the bag opening of the packaging bag is opened to an appropriate width and height. After the filling of the material into the packaging bag is completed, the first opening mechanism 5 and the second opening mechanism 6 move backward under the driving of the front-rear translation mechanism and exit from the bag opening of the packaging bag.

[0050] The first left-right translation seat 7 and the second left-right translation seat 8 are each provided with a second bag opening translation guide rail 35 extending in the front-rear direction. The first front-rear translation seat 33 is provided with a second sliding block 36 matched with the second bag opening translation guide rail 35 on the first left-right translation seat 7, and the second front-rear translation seat 34 is provided with a second sliding block 36 matched with the second bag opening translation guide rail 35 on the second left-right translation seat 8. Figure 3 And Figure 4 The front-rear translation mechanism comprises a front-rear translation driving motor 37, a second rotating shaft 38, a third connecting rod 39, a fourth connecting rod 40, and a translation seat cross bar 41. The second rotating shaft 38 is rotatably installed on the bag opening base 2. One end of the third connecting rod 39 is connected with the second rotating shaft 38, and the other end of the third connecting rod 39 is hingedly connected with one end of the fourth connecting rod 40. The other end of the fourth connecting rod 40 is hingedly connected with the translation seat cross bar 41. The power output shaft of the front-rear translation driving motor 37 is in transmission connection with the second rotating shaft 38. The first front-rear translation seat 33 and the second front-rear translation seat 34 are connected with the translation seat cross bar 41.

[0051] The relative positions of the first front-to-back translation seat 33, the second front-to-back translation seat 34 and the translation seat crossbar 41 are adjustable. In this embodiment, the translation seat crossbar 41 is provided with a third bag-opening translation guide rail 42 that runs left and right. The first front-to-back translation seat 33 and the second front-to-back translation seat 34 are respectively provided with a third slider 43 that cooperates with the third bag-opening translation guide rail 42. When it is necessary to adjust the distance between the first opening mechanism 5 and the second opening mechanism 6, the third slider 43 on the first front-back translation seat 33 and the third slider 43 on the second front-back translation seat 34 can move along the third bag opening translation guide rail 42. At this time, the first left-right translation seat 7, the first front-back translation seat 33, and the first opening mechanism 5 move together in the left-right direction, and the second left-right translation seat 8, the second front-back translation seat 34, and the second opening mechanism 6 also move together in the left-right direction. After adjusting the distance between the first opening mechanism 5 and the second opening mechanism 6, the first front-back translation seat 33, the second front-back translation seat 34 and the translation seat crossbar 41 are fixed together by locking components (such as bolts or screws), so that the front-back translation mechanism can smoothly drive the translation seat crossbar 41, the first front-back translation seat 33, and the second front-back translation seat 34 to move back and forth together.

[0052] like Figure 6 and Figure 7 As shown ( Figure 6 and Figure 7 The structure of the first opening mechanism 5 is shown. The structure of the second opening mechanism 6 is the same as that of the first opening mechanism 5 (the first opening mechanism 5 and the second opening mechanism 6 are symmetrical from left to right). Both the first opening mechanism 5 and the second opening mechanism 6 include an opening mechanism bracket 51, a swing shaft 52, a movable seat 53, an upper opening plate 54, a lower opening plate 55, an opening and closing shaft 56, a first opening and closing connecting rod 57, and a second opening and closing connecting rod 58. The swing shaft 52 is rotatably mounted on the opening mechanism bracket 51 and runs vertically. The movable seat 53 is mounted on the swing shaft. On the rotating shaft 52, the opening and closing shaft 56 is rotatably mounted on the movable seat 53 and arranged horizontally. The rear end of the upper opening plate 54 is connected to the opening and closing shaft 56, and the rear end of the lower opening plate 55 is connected to the movable seat 53. The first end of the first opening and closing connecting rod 57 is connected to the opening and closing shaft 56, and the second end of the first opening and closing connecting rod 57 is hinged to the first end of the second opening and closing connecting rod 58. The second end of the second opening and closing connecting rod 58 is hinged to the opening mechanism bracket 51. The opening mechanism bracket 51 is provided with a swing mechanism that can drive the swing shaft 52 to rotate. In this embodiment, the first opening mechanism 5 is mounted on the first front and rear translation seat 33 through its opening mechanism bracket 51, and the second opening mechanism 6 is mounted on the second front and rear translation seat 34 through its opening mechanism bracket 51.

[0053] In this embodiment, the second end of the first opening and closing link 57 is hinged to the first end of the second opening and closing link 58 via the first ball joint 59, and the second end of the second opening and closing link 58 is hinged to the support bracket 51 of the opening mechanism via the second ball joint 510.

[0054] In this embodiment, the second opening and closing link 58 is a length-adjustable rod. The second opening and closing link 58 comprises a first connecting screw 581, a second connecting screw 582, and an internally threaded pipe 583, the first connecting screw 581 and the second connecting screw 582 are respectively provided with external threads and have opposite screw directions, the internally threaded pipe 583 is respectively provided with internal threads at both ends matching the first connecting screw 581 and the second connecting screw 582, the end of the first connecting screw 581 is hingedly connected to the second end of the first opening and closing link 57, and the end of the second connecting screw 582 is hingedly connected to the opening and supporting mechanism support 51. The middle part of the internally threaded pipe 583 is symmetrically provided with two notches 584 which can be matched with a wrench or the like tool; when it is necessary to adjust the length of the second opening and closing link 58, the two sides of the opening of the wrench are respectively embedded in the two notches 584, and then the internally threaded pipe 583 can be twisted to adjust the length of the second opening and closing link 58.

[0055] The above-mentioned swinging mechanism comprises a swinging cylinder 511, a first swinging link 512, a second swinging link 513, and a third swinging link 514, the cylinder body of the swinging cylinder 511 is hingedly connected to the opening and supporting mechanism support 51, the piston rod of the swinging cylinder 511 is provided with a hinged seat 515, the hinged seat 515 is provided with a pin shaft 516, the first end of the first swinging link 512 is connected to the swinging pivot 52 (or the movable seat 53), the second end of the first swinging link 512 is hingedly connected to the first end of the second swinging link 513, the second end of the second swinging link 513 is provided with a circular pin hole matching and sleeved with the pin shaft 516 (the hinged connection between the second end of the second swinging link 513 and the hinged seat 515 is realized through the structure), the first end of the third swinging link 514 is hingedly connected to the opening and supporting mechanism support 51, and the second end of the third swinging link 514 is provided with a circular pin hole matching and sleeved with the pin shaft 516 (the hinged connection between the second end of the third swinging link 514 and the hinged seat 515 is realized through the structure). When the piston rod of the swinging cylinder 511 is extended or retracted, the swinging pivot 52 is driven to rotate through the second swinging link 513 and the first swinging link 512, so as to realize the swinging of the movable seat 53, the upper bag opening plate 54, and the lower bag opening plate 55; the third swinging link 514 is used to move the hinged seat 515 and the pin shaft 516 along a predetermined trajectory.

[0056] The opening and supporting mechanism support 51 is provided with a limiting block 517 in front of the hinged seat 515. When the piston rod of the swinging cylinder 511 is extended, the hinged seat 515 contacts the limiting block 517 when reaching the predetermined stroke and stops moving forward, so that the left and right swinging angles of the upper bag opening plate 54 and the lower bag opening plate 55, and the upward swinging angle of the upper bag opening plate 54 can be more accurately controlled. Preferably, the position of the limiting block 517 in the front and back direction is adjustable.

[0057] In the embodiment, the opening mechanism support 51 is provided with a bag opening edge clamping plate 518, which is located outside the upper bag opening plate 54. A clamping gap 519 is formed between the front end of the bag opening edge clamping plate 518 and the outer side surface 541 of the upper bag opening plate 54. Figure 8 A rubber-coated screw 520 is installed at the front end of the bag opening edge clamping plate 518. The head 521 of the rubber-coated screw 520 is located on the side of the bag opening edge clamping plate 518 facing the upper bag opening plate 54, and the head 521 of the rubber-coated screw 520 and the outer side surface 541 of the upper bag opening plate 54 form the clamping gap 519. The head of the rubber-coated screw 520 is wrapped with an elastic material 522 (such as polyurethane), which serves to buffer and increase the friction coefficient. When the upper bag opening plate 54 and the lower bag opening plate 55 of the first opening mechanism 5 and the second opening mechanism 6 are inserted into the bag opening of the packaging bag, the left and right bag opening edges of the packaging bag enter the clamping gap 519 of the first opening mechanism 5 and the second opening mechanism 6, respectively. After the upper bag opening plate 54 is swung outward by the driving of the swinging mechanism, the bag opening is expanded in the left and right directions, and at the same time, the outer side surface 541 of the upper bag opening plate 54 and the head 521 of the rubber-coated screw 520 jointly clamp the bag opening edge 101 in the clamping gap 519, so as to keep the position of the bag opening of the packaging bag stable.

[0058] The front end of the bag opening edge clamping plate 518 is provided with a strip-shaped limiting hole 523, and the screw rod part 524 of the rubber-coated screw 520 passes through the strip-shaped limiting hole 523. A second locking nut 525 is installed on the screw rod part 524 of the rubber-coated screw 520, and the second locking nut 525 and the head 521 of the rubber-coated screw jointly clamp the front end of the bag opening edge clamping plate 518. By adjusting the position of the screw rod part 524 of the rubber-coated screw in the strip-shaped limiting hole 523, the position of the head 521 of the rubber-coated screw can be adjusted, so as to adjust the clamped position of the bag opening edge. In the embodiment, the strip-shaped limiting hole 523 is upwardly oriented, so that the height position of the head 521 of the rubber-coated screw can be adjusted.

[0059] The front end of the bag opening edge clamping plate 518 is located at the rear side of the front end of the upper bag opening plate 54.

[0060] The opening base 2 is provided with a material supporting plate 44, which, together with the first feeding plate 3 and the second feeding plate 4, forms a material entering channel. The first feeding plate 3, the second feeding plate 4, the lower bag opening plate 55 in the first opening mechanism 5 and the second opening mechanism 6 are all located on the upper side of the material supporting plate 44.

[0061] The bag opening device further comprises a first movable bag pressing plate 45 and a second movable bag pressing plate 46, the first movable bag pressing plate 45 is installed on the first left-right translation seat 7, and the second movable bag pressing plate 46 is installed on the second left-right translation seat 8; and a fixed bag pressing portion 47 is arranged at the middle part of the front side edge of the material supporting plate 44. The functions and working principles of the first movable bag pressing plate 45, the second movable bag pressing plate 46 and the fixed bag pressing portion 47 are the same as those of the first movable bag pressing plate, the second movable bag pressing plate and the fixed bag pressing portion in the bag pressing opening device of the packaging machine disclosed in the Chinese Utility Model Patent Specification Publication No. CN207417259U; the difference is that, in the embodiment, the first movable bag pressing plate 45 moves together with the first left-right translation seat 7, and the second movable bag pressing plate 46 moves together with the second left-right translation seat 8, so it is not necessary to separately arrange a movable bag pressing plate position adjusting mechanism to adjust the positions of the first movable bag pressing plate and the second movable bag pressing plate in the left-right direction.

[0062] The working principle of the bag opening device will be briefly described as follows:

[0063] When it is necessary to adjust the spacing (for example, it is necessary to adjust the spacing according to the size of the bag opening), the first left-right translation seat 7 and the second left-right translation seat 8 are driven by the left-right translation mechanism to move towards or away from each other in the left-right direction, so that the spacing between the first opening mechanism 5 and the second opening mechanism 6, the spacing between the first material feeding plate 3 and the second material feeding plate 4, the spacing between the first bag suction nozzle 9 and the second bag suction nozzle 10, and the spacing between the first movable bag pressing plate 45 and the second movable bag pressing plate 46 can be adjusted at one time, so that the spacing between the corresponding components on the left and right sides meets the production requirements, and the spacing between the corresponding components on the left and right sides is adjusted synchronously, which is convenient and fast. Moreover, before and after the adjustment, the relative positions among the first material feeding plate 3, the first opening mechanism 5, the first bag suction nozzle 9 and the first movable bag pressing plate 45 on the first left-right translation seat 7 remain unchanged, and the relative positions among the second material feeding plate 4, the second opening mechanism 6, the second bag suction nozzle 10 and the second movable bag pressing plate 46 on the second left-right translation seat 8 remain unchanged, so it is usually not necessary to re-calibrate.

[0064] When the bag opening device is working, the bag feeding device sends the packaging bag to the lower side of the suction device, and the suction device sucks the upper side of the packaging bag to open the bag opening (after the first bag suction nozzle 9 and the second bag suction nozzle 10 suck the upper side of the packaging bag, the power output shaft of the suction nozzle horizontal rod lifting driving motor 21 drives the first rotating shaft 22 to rotate by a certain angle, the first rotating shaft 22 drives the suction nozzle horizontal rod 11 to rise through the first connecting rod 23 and the second connecting rod 24, and then drives the first bag suction nozzle vertical rod 14 and the second bag suction nozzle vertical rod 15 to rise at the same time through the first bag suction nozzle sliding block 12 and the second bag suction nozzle sliding block 13 respectively, and the first bag suction nozzle vertical rod 14 and the second bag suction nozzle vertical rod 15 drive the first bag suction nozzle 9 and the second bag suction nozzle 10 to rise at the same time), the first opening mechanism 5 and the second opening mechanism 6 are inserted into the bag opening of the packaging bag (after the first opening mechanism 5 and the second opening mechanism 6 are inserted into the bag opening, the first bag suction nozzle 9 and the second bag suction nozzle 10 can be released from the suction of the upper side of the packaging bag), so that the bag opening of the packaging bag is opened, so that the bag opening is opened to the appropriate width and height; then the pushing mechanism pushes the sheet material (for example, a stack of paper diapers after compaction), and the sheet material enters the packaging bag through the gap between the first feeding plate 3 and the second feeding plate 4, and then through the gap between the first opening mechanism 5 and the second opening mechanism 6.

[0065] The working principle of the first opening mechanism 5 and the second opening mechanism 6 to open the bag opening is briefly described as follows:

[0066] The front ends of the upper bag opening plate 54 and the lower bag opening plate 55 of the first bag opening mechanism 5 and the second bag opening mechanism 6 are close to each other in the initial state. After the bag feeding device feeds the packaging bag to the lower side of the suction device, the upper bag opening plate 54 and the lower bag opening plate 55 of the first bag opening mechanism 5 and the second bag opening mechanism 6 are inserted into the bag opening of the packaging bag in the forward direction, and are simultaneously swung outward around the swing shaft 52 under the drive of the swing mechanism, so as to open the bag opening to the left and right directions. At the same time, the first end position of the first opening and closing link 57 changes (for example, the first end of the first opening and closing link 57 is closer to the second end of the second opening and closing link 58) due to the outward swing of the movable seat 53 around the swing shaft 52. In this way, the second end of the first opening and closing link 57 swings around the opening and closing shaft 56 under the pushing action of the second opening and closing link 58, the opening and closing shaft 56 rotates, thereby driving the front end of the upper bag opening plate 54 to swing upward, the distance between the front end of the upper bag opening plate 54 and the front end of the lower bag opening plate 55 increases, and the bag opening of the packaging bag is opened to the upward and downward directions, so as to open the bag opening to a proper width and height. When resetting is needed, the first bag opening mechanism 5 and the second bag opening mechanism 6 retreat, and the upper bag opening plate 54 and the lower bag opening plate 55 simultaneously swing inward around the swing shaft 52 under the drive of the swing mechanism. At the same time, the second end of the first opening and closing link 57 swings reversely around the opening and closing shaft 56 under the action of the second opening and closing link 58 due to the inward swing of the movable seat 53 around the swing shaft 52, the opening and closing shaft 56 reversely rotates, thereby driving the front end of the upper bag opening plate 54 to swing downward, and the front end of the upper bag opening plate 54 and the front end of the lower bag opening plate 55 are close to each other.

[0067] Embodiment 2, reference Figure 9 In this embodiment, the encapsulated screw 520 is installed on the bag opening edge clamping plate 518 in the following manner: the front end of the bag opening edge clamping plate 518 is provided with a threaded hole 526, and the threaded rod part 524 of the encapsulated screw 520 is screwed in the threaded hole 526. By adjusting the screwing depth of the threaded rod part 524 of the encapsulated screw, the initial gap size between the head part 521 of the encapsulated screw and the outer side surface 541 of the upper bag opening plate 54 can be adjusted, so as to adjust the clamping force when the outer side surface 541 of the upper bag opening plate 54 and the head part 521 of the encapsulated screw jointly clamp the bag opening edge. The remaining structures of this embodiment are the same as those of Embodiment 1.

[0068] In other embodiments, the suction cup nozzle lifting mechanism can also include a first suction cup nozzle lifting driving mechanism capable of driving the first suction cup nozzle to lift, and a second suction cup nozzle lifting driving mechanism capable of driving the second suction cup nozzle to lift; the first suction cup nozzle lifting driving mechanism is installed on the first left-right translation seat, and the power output end of the first suction cup nozzle lifting driving mechanism is connected with the first suction cup nozzle; the second suction cup nozzle lifting driving mechanism is installed on the second left-right translation seat, and the power output end of the second suction cup nozzle lifting driving mechanism is connected with the second suction cup nozzle. The first suction cup nozzle lifting driving mechanism and the second suction cup nozzle lifting driving mechanism can adopt a pneumatic cylinder, the piston rod of the pneumatic cylinder is upward or downward, and the piston rod of the pneumatic cylinder is the power output end. The first suction cup nozzle lifting driving mechanism and the second suction cup nozzle lifting driving mechanism can also adopt a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0069] In other embodiments, the front-rear translation mechanism can also include a first front-rear translation driving device capable of driving the first front-rear translation seat to translate forward and backward relative to the first left-right translation seat, and a second front-rear translation driving device capable of driving the second front-rear translation seat to translate forward and backward relative to the second left-right translation seat, the first front-rear translation driving device is installed on the first left-right translation seat, and the second left-right translation seat is installed on the second left-right translation seat. The first front-rear translation driving device and the second front-rear translation driving device can adopt a pneumatic cylinder, the piston rod of the pneumatic cylinder is forward or backward, and the piston rod of the pneumatic cylinder is connected with the first front-rear translation seat and the second front-rear translation seat. The first front-rear translation driving device and the second front-rear translation driving device can also adopt a structure in which a motor is matched with a synchronous belt (or chain, gear / rack, nut / screw).

[0070] In other embodiments, in the left-right translation mechanism, only a left-right translation driving motor can be used to drive the bag opening translation screw to rotate, the left-right translation driving motor is installed on the bag opening base, and the bag opening translation screw is in transmission connection with the power output shaft of the left-right translation driving motor. The left-right translation driving motor drives the bag opening translation screw to rotate forward or reversely, so as to drive the two bag opening translation nuts to move close to each other or away from each other, thereby moving the first left-right translation seat and the second left-right translation seat close to each other or away from each other.

[0071] In other embodiments, in the left-right translation mechanism, only a first adjusting hand wheel can be used to drive the bag opening translation screw to rotate, and the first adjusting hand wheel is installed on one end of the bag opening translation screw. The first adjusting hand wheel is manually rotated to drive the bag opening translation screw to rotate forward or reversely, so as to drive the two bag opening translation nuts to move close to each other or away from each other, thereby moving the first left-right translation seat and the second left-right translation seat close to each other or away from each other.

[0072] In other embodiments, as another embodiment of the swing mechanism, the swing mechanism comprises a swing cylinder and a first swing link, the cylinder body of the swing cylinder is hinged with the opening mechanism support, the first end of the first swing link is connected with the swing pivot or the movable seat, and the second end of the first swing link is hinged with the piston rod of the swing cylinder. When the piston rod of the swing cylinder is extended or retracted, the swing pivot is driven to rotate through the first swing link, so as to realize the swing of the movable seat, the upper bag opening plate and the lower bag opening plate.

Claims

1. A bag opening device of a packaging machine, comprising a machine frame, a bag opening base, a suction device, a first feeding plate, a second feeding plate, a first opening mechanism and a second opening mechanism, the bag opening base is installed on the machine frame, the first feeding plate and the second feeding plate are arranged side by side, the first opening mechanism and the second opening mechanism are arranged side by side, the suction device comprises a first suction nozzle, a second suction nozzle and a suction nozzle lifting mechanism capable of driving the two suction nozzles to lift, the first suction nozzle and the second suction nozzle are arranged side by side, characterized in that: The bag opening device further comprises a first left-right translation seat and a second left-right translation seat, and the bag opening base is provided with a left-right translation mechanism capable of driving the first left-right translation seat and the second left-right translation seat to move closer to or farther away from each other in the left-right direction; the first feeding plate, the first opening mechanism and the first bag suction nozzle are all mounted on the first left-right translation seat, and the second feeding plate, the second opening mechanism and the second bag suction nozzle are all mounted on the second left-right translation seat.

2. The opening device of a packaging machine according to claim 1, characterized in that: The bag suction nozzle lifting mechanism comprises a bag suction nozzle horizontal rod, a first bag suction nozzle sliding block, a second bag suction nozzle sliding block, a first bag suction nozzle vertical rod, a second bag suction nozzle vertical rod, a first vertical rod guide block and a second vertical rod guide block, and the rack is provided with a bag suction nozzle horizontal rod lifting driving mechanism capable of driving the bag suction nozzle horizontal rod to lift; The bag suction nozzle horizontal rod is provided with a left-right horizontal bag suction nozzle horizontal guide rail, the first bag suction nozzle sliding block and the second bag suction nozzle sliding block are both mounted on the bag suction nozzle horizontal guide rail and can move along the bag suction nozzle horizontal guide rail, the first bag suction nozzle vertical rod is connected with the first bag suction nozzle sliding block, the first bag suction nozzle is mounted on the upper end of the first bag suction nozzle vertical rod, the second bag suction nozzle vertical rod is connected with the second bag suction nozzle sliding block, and the second bag suction nozzle is mounted on the upper end of the second bag suction nozzle vertical rod; The first vertical rod guide block is mounted on the first left-right translation seat, the first vertical rod guide block is provided with a first vertical rod guide groove or a first vertical rod guide hole extending in the up-down direction, the first bag suction nozzle vertical rod is located in the first vertical rod guide groove or the first vertical rod guide hole, and the first bag suction nozzle vertical rod can lift relative to the first vertical rod guide block; the second vertical rod guide block is mounted on the second left-right translation seat, the second vertical rod guide block is provided with a second vertical rod guide groove or a second vertical rod guide hole extending in the up-down direction, the second bag suction nozzle vertical rod is located in the second vertical rod guide groove or the second vertical rod guide hole, and the second bag suction nozzle vertical rod can lift relative to the second vertical rod guide block.

3. A bag opening device of a packaging machine according to claim 1 or 2, characterized in that: The left-right translation mechanism comprises a first bag opening translation guide rail, a bag opening translation screw and two bag opening translation nuts; the first bag opening translation guide rail is arranged on the bag opening base and extends in the left-right direction, and the first left-right translation seat and the second left-right translation seat are respectively provided with a first sliding block in sliding cooperation with the first bag opening translation guide rail; the bag opening translation screw is rotatably mounted on the bag opening base in the horizontal direction; the bag opening translation screw is provided with a first forward threaded section and a first reverse threaded section, and the two bag opening translation nuts are respectively screwed with the first forward threaded section and the first reverse threaded section; and the two bag opening translation nuts are connected with the first left-right translation seat and the second left-right translation seat respectively.

4. The bag opening device of the packaging machine according to claim 3, characterized in that: The first left-right translation seat and the second left-right translation seat are respectively provided with a locking structure in cooperation with the first bag opening translation guide rail. The locking structure comprises a locking slider, a locking bolt and a locking nut. The locking slider comprises a front clamping part and a rear clamping part. The upper end of the front clamping part is connected to the upper end of the rear clamping part. A gap is formed between the middle part of the front clamping part and the middle part of the rear clamping part. The lower part of the front clamping part and the lower part of the rear clamping part are respectively provided with a sliding groove matched with the first bag opening translation guide rail. The middle part of the front clamping part is provided with a front-to-back front through hole. The middle part of the rear clamping part is provided with a front-to-back rear through hole. The front through hole and the rear through hole are aligned with each other. The rod part of the locking bolt passes through the front through hole and the rear through hole. The head part of the locking bolt and the locking nut are respectively arranged on the front side and the rear side of the locking slider.

5. The bag opening device of the packaging machine according to claim 1 or 2, characterized in that: The bag opening device further comprises a first front-to-back translation seat, a second front-to-back translation seat and a front-to-back translation mechanism. The front-to-back translation mechanism can drive the first front-to-back translation seat and the second front-to-back translation seat to respectively translate forward and backward relative to the first left-to-right translation seat and the second left-to-right translation seat. The first opening mechanism is installed on the first front-to-back translation seat, and the second opening mechanism is installed on the second front-to-back translation seat. The first left-to-right translation seat and the second left-to-right translation seat are both provided with a second bag opening translation guide rail extending in the front-to-back direction. The first front-to-back translation seat is provided with a second sliding block matched with the second bag opening translation guide rail on the first left-to-right translation seat. The second front-to-back translation seat is provided with a second sliding block matched with the second bag opening translation guide rail on the second left-to-right translation seat. The front-to-back translation mechanism comprises a front-to-back translation driving motor, a second rotating shaft, a third connecting rod, a fourth connecting rod and a translation seat cross bar. The second rotating shaft is rotatably installed on the bag opening base. One end of the third connecting rod is connected to the second rotating shaft. The other end of the third connecting rod is hingedly connected to one end of the fourth connecting rod. The other end of the fourth connecting rod is hingedly connected to the translation seat cross bar. The power output shaft of the front-to-back translation driving motor is in transmission connection with the second rotating shaft. The first front-to-back translation seat and the second front-to-back translation seat are connected to the translation seat cross bar.

6. A bag opening device of a packaging machine according to claim 1 or 2, characterized in that: The first opening mechanism and the second opening mechanism both comprise an opening mechanism support, a swing rotating shaft, a movable seat, an upper opening plate, a lower opening plate, an opening and closing rotating shaft, a first opening and closing connecting rod and a second opening and closing connecting rod. The swing rotating shaft is rotatably installed on the opening mechanism support in an up-to-down direction. The movable seat is installed on the swing rotating shaft. The opening and closing rotating shaft is rotatably installed on the movable seat in a horizontal direction. The rear end of the upper opening plate is connected to the opening and closing rotating shaft. The rear end of the lower opening plate is connected to the movable seat. The first end of the first opening and closing connecting rod is connected to the opening and closing rotating shaft. The second end of the first opening and closing connecting rod is hingedly connected to the first end of the second opening and closing connecting rod. The second end of the second opening and closing connecting rod is hingedly connected to the opening mechanism support. The opening mechanism support is provided with a swing mechanism capable of driving the swing rotating shaft to rotate.

7. A bag opening device of a packaging machine according to claim 6, characterized in that: The second end of the first opening and closing connecting rod is hingedly connected to the first end of the second opening and closing connecting rod through a first spherical hinge. The second end of the second opening and closing connecting rod is hingedly connected to the opening mechanism support through a second spherical hinge.

8. The opening device of a packaging machine according to claim 6, characterized in that: The swing mechanism comprises a swing cylinder, a first swing connecting rod, a second swing connecting rod and a third swing connecting rod, the cylinder body of the swing cylinder is hinged to the opening mechanism support, a hinged seat is arranged on the piston rod of the swing cylinder, a pin shaft is arranged on the hinged seat, the first end of the first swing connecting rod is connected to the swing pivot or the movable seat, the second end of the first swing connecting rod is hinged to the first end of the second swing connecting rod, the second end of the second swing connecting rod is provided with a circular pin hole matched with the pin shaft and in sleeved fit, the first end of the third swing connecting rod is hinged to the opening mechanism support, and the second end of the third swing connecting rod is provided with a circular pin hole matched with the pin shaft and in sleeved fit.

9. The opening device of a packaging machine according to claim 6, characterized in that: The opening mechanism support is provided with a bag opening edge clamping plate, the bag opening edge clamping plate is located outside the upper bag opening plate, and a clamping gap is formed between the front end of the bag opening edge clamping plate and the outer side surface of the upper bag opening plate.

10. A bag opening device of a packaging machine according to claim 9, characterized in that: The front end of the bag opening edge clamping plate is provided with a rubber-coated screw, the head of the rubber-coated screw is located on the side of the bag opening edge clamping plate facing the upper bag opening plate, and the head of the rubber-coated screw and the outer side surface of the upper bag opening plate have the clamping gap.

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