CN113135330A

CN113135330A - Automatic bag opening system and control method thereof

Info

Publication number: CN113135330A
Application number: CN202110526559.8A
Authority: CN
Inventors: 吴国忠; 李鹏超; 张可洲; 吴玉生; 李楠; 王昭焜; 林水艇
Original assignee: Xiamen Tobacco Industry Co Ltd
Current assignee: Xiamen Tobacco Industry Co Ltd
Priority date: 2021-05-14
Filing date: 2021-05-14
Publication date: 2021-07-20

Abstract

The invention discloses an automatic bag opening system and a control method thereof. The automatic bag opening system comprises a material bag conveying device, a bag opening device and a bag grabbing device. The material bag conveying device is used for conveying material bags. The bag opening device comprises a frame, a bracket and a cutting knife. The frame is fixed, and the bracket sets up in the frame and is located material bag conveyor's low reaches in order to receive the material bag. And the bracket comprises at least two support rods arranged at intervals in the width direction. The cutter is positioned at the gap between the two adjacent support rods and is movably arranged relative to the bracket to cut the packaging bag. The bag grabbing device is arranged above the bag opening device and is used for grabbing the packaging bag. The automatic bag opening system utilizes the material bag conveying device to convey material bags to a bracket of the bag opening device, the cutting knife is controlled to cut the packaging bags to form broken openings, the materials can fall through the broken openings, the bag opening device is controlled to grab the packaging bags on the outer side to separate the materials from the packaging bags, automatic bag opening is achieved, and bag opening efficiency is improved.

Description

Automatic bag opening system and control method thereof

Technical Field

The invention relates to an automatic bag opening system and a control method thereof.

Background

When most cigarette factories pretreat tobacco stems, the stems need to be poured into a belt conveyor for pretreatment in a mode of manually untying jute bags and cutting plastic bags with a cutting knife, so that the labor intensity is high and the feeding efficiency is low. And the field dust is large, which is harmful to the occupational health of personnel. Aiming at a plurality of problems, a small part of cigarette factories adopt semi-automatic unpacking equipment, the labor intensity of workers is greatly reduced, and the production efficiency is improved. However, due to the diversification of shapes and packaging modes of the sacks produced from various places, the success rate of grabbing and clamping the sacks by the semi-automatic unpacking equipment is low, and the effect is not ideal.

Therefore, standardized box-type tobacco stems are produced, the tobacco stems are put into a paper box sleeved with plastic bags, for example, a tobacco stem box of 200 kg/box, because the tobacco stem box of 200 kg/box is heavy and in order to ensure the firmness and moisture resistance of transportation and packaging, each box of tobacco stems is often put into a two-layer paper box with a film bag arranged inside, and 4 nylon bands are bound into an outer paper box. Obviously, the packing of box-type tobacco stems is different from that of hemp bag-type tobacco stems, and the existing semi-automatic unpacking equipment does not meet the requirement. Although a few cigarette factories adopt a tobacco stem box turning mechanism to pour out tobacco stems, the tobacco stems lined with plastic bags in boxes have no way, and most of the tobacco stems are manually cut into bags.

It is important to note here that the statements in this background section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Disclosure of Invention

The invention provides an automatic bag opening system and a control method thereof, which aim to improve the bag opening efficiency.

The invention provides an automatic bag opening system in a first aspect, which comprises:

the material bag conveying device is used for conveying material bags, and each material bag comprises a packaging bag and materials filled in the packaging bag;

the bag opening device comprises a rack, a bracket and a cutter, wherein the rack is fixedly arranged, the bracket is arranged on the rack and positioned at the downstream of the material bag conveying device to receive material bags, the bracket comprises at least two supporting rods arranged at intervals in the width direction, and the cutter is positioned at a gap between every two adjacent supporting rods and movably arranged relative to the bracket to cut the packaging bags; and

and the bag grabbing device is arranged above the bag opening device and is used for grabbing the packaging bag.

In some embodiments, the bracket comprises a V-shaped bracket and includes at least two V-shaped support bars spaced apart in a width direction.

In some embodiments, one end of the V-shaped bracket is rotatably connected to the frame.

In some embodiments, the bag opener further comprises a buffer support disposed between the frame and the bracket.

In some embodiments, the bag opener further comprises a cutter drive configured to drive the cutter to move relative to the carriage.

In some embodiments, the bag gripper comprises a bag-piercing mechanism comprising a bag-piercing arm and at least one bag-piercing claw arranged on the bag-piercing arm, the bag-piercing claw being arranged so as to be pivotable relative to the bag-piercing arm for piercing into the packaging bag.

In some embodiments, the bag tying mechanism further comprises a connecting block movably connected to the bag tying arm and the bag tying pawl is connected to the connecting block.

In some embodiments, the bag grabbing device further comprises a bag feeding mechanism, the bag feeding mechanism comprises a slide rail and a slide block, the slide rail extends along the length direction, the slide block is connected with the bag binding arm, and the slide block is movably arranged on the slide rail to drive the bag binding mechanism to move along the length direction.

In some embodiments, the bag gripping device further comprises a bag dropping funnel disposed below the bag tying mechanism to receive the empty packaging bag.

In some embodiments, the automatic bag opening system further comprises a dust box having a feed inlet and a dust suction port at a top end, the material bag conveying device is disposed in the dust box and located at the feed inlet to receive the material bag input from the feed inlet, the bag opening device and the bag grasping device are both located in the dust box, and the dust suction port is configured to be connected with the dust collector to suck dust.

In some embodiments, the automatic bag opening system comprises a controller and a position detection part arranged on the bracket, when the position detection part detects that the material bag is conveyed onto the bracket, the controller controls the bag grabbing device to act to grab the packaging bag and controls the cutting knife to act to cut the packaging bag so as to enable the material to fall down.

In some embodiments, the position detector is a pressure switch.

In some embodiments, the automatic bag opening system comprises a controller and a material conveying device, the material conveying device comprises a material conveyor and a material level detection part arranged on the material conveyor, the material conveyor is located below the bag opening device and used for receiving materials falling from the material bags and conveying the materials to the outlet, the material level detection part is used for detecting the material level of the materials on the material conveyor, and the controller controls the material bag conveying device to act according to the material level detected by the material level detection part so as to convey the next material bag to the bracket.

In some embodiments, the automatic bag opening system is an automatic tobacco stem bag opening system.

The second aspect of the invention provides a control method based on the automatic bag opening system, which comprises the following steps:

controlling the material conveying device to act so as to convey the material bags onto the bracket;

when the position detection piece detects that the material bag reaches the bracket, the bag grabbing device is controlled to act to grab the packaging bag; and

the cutting knife is controlled to move relative to the bracket to cut the packaging bag so as to enable the material to fall.

In some embodiments, the control method further comprises: the bracket is controlled to move up and down to form shaking of the material bag during the falling of the material.

In some embodiments, the bag gripping device comprises a bag binding mechanism, the bag binding mechanism comprises a bag binding arm, a connecting block and at least one bag binding claw, the connecting block is movably connected to the bag binding arm, the bag binding claw is connected to the connecting block in a swinging mode, after the materials fall for a preset time period, the connecting block is controlled to move upwards to drive the packaging bag to move upwards to be suspended, and then the bag binding claw is controlled to swing for multiple times.

Based on the aspects provided by the invention, the automatic bag opening system utilizes the material bag conveying device to convey the material bags onto the bracket of the bag opening device, and controls the cutting knife to cut the packaging bags into the openings, so that the materials can fall through the openings, and controls the bag grabbing device to grab the packaging bags on the outer side to separate the materials from the packaging bags, thereby realizing automatic bag opening and improving the bag opening efficiency. But also can reduce the influence of dust pollution caused by manual bag cutting on the health of workers.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural diagram of an automatic bag opening system according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the bag opener in fig. 1.

Fig. 3 is a schematic structural view of the bag holding device in fig. 1.

Fig. 4 is a schematic view of the bag grasping apparatus shown in fig. 3 grasping the packing bag.

Fig. 5 is a schematic view of the bag grasping apparatus of fig. 3 releasing the packaging bag.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously positioned and the spatially relative descriptors used herein interpreted accordingly.

The embodiment of the invention provides an automatic bag opening system which is arranged at the downstream of a packing box unpacking machine, and can automatically open bags filled with materials and enable the materials to fall down smoothly after a carton on the outer side of the packing box unpacking machine is opened and removed. For the feeding of the tobacco stems, the automatic bag opening system can solve the problem that the tobacco stems are completely separated from plastic bags after the box-type tobacco stems are opened, and improves the automation degree of the tobacco stem pretreatment process.

Referring to fig. 1, in the production line, an automatic bag opening system 200 is disposed between an upstream belt conveyor 100 and a downstream belt conveyor 300, wherein the upstream belt conveyor 100 is used for conveying material bags 400 filled with materials to the automatic bag opening system 200, and the automatic bag opening system 200 is used for automatically opening the packaging bags of the material bags 400 so that the materials inside are output to the downstream belt conveyor 300.

Referring to fig. 1-3, in some embodiments, the automatic bag opening system includes a material bag conveying device 220, a bag opening device 230, and a bag grasping device 240. The material bag transferring device 220 is used for transferring the material bag 400. The stuff bag 400 includes a packing bag and stuff filled in the packing bag. The bag opener 230 includes a frame 237, a bracket 231, and a cutter 235. The frame 237 is fixedly disposed, and the bracket 231 is disposed on the frame 237 and located downstream of the material bag conveying device 220 to receive the material bag 400. And the bracket 231 includes at least two support bars 2311 spaced apart in the width direction. The cutter 235 is located at a gap between adjacent two of the support bars 2311 and is movably disposed with respect to the bracket 231 to cut the packing bag. The bag grasping device 240 is disposed above the bag opening device 230 and is used to grasp the packaging bag.

According to the automatic bag opening system, the material bag conveying device 220 is used for conveying the material bags 400 to the bracket 231 of the bag opening device 230, the cutting knife 235 is controlled to cut the packaging bags to form the openings, so that the materials can fall through the openings, the bag grasping device 240 is controlled to grasp the packaging bags on the outer side to separate the materials from the packaging bags, the automatic bag opening is further realized, and the bag opening efficiency is improved. But also can reduce the influence of dust pollution caused by manual bag cutting on the health of workers.

In some embodiments, the bracket 231 comprises a V-shaped bracket. And the V-shaped bracket comprises at least two V-shaped supporting rods arranged at intervals in the width direction. With the form that sets up bracket 231 as the V type structure, refer to fig. 1, when material bag 400 supported on the V type bracket, the shape of material bag 400 also can become the form of falling the triangle along with the V type bracket, like this when cutting knife 235 removes and cuts open the wrapping bag along the length direction of V type bracket, the breach slope on the wrapping bag sets up, does benefit to the material homoenergetic of different positions and falls through the breach.

It should be noted that, in the embodiment of the present invention, the angle α of the V-shaped bracket and the distance M of the gap between two adjacent V-shaped support rods are not limited.

In some embodiments, the carriage 231 is movably disposed relative to the frame 237. Thus, during the blanking process, the cradle 231 can be controlled to vibrate with a small amplitude relative to the frame 237 to accelerate the falling of the material.

In some embodiments, referring to fig. 1 and 2, one end of the V-shaped bracket is rotatably coupled to the frame 237. One end of the V-shaped bracket is connected with a rotating shaft 232, and the rotating shaft 232 is connected to the frame 237 through a bearing. In the blanking process, the bracket oil cylinder 233 is controlled to move so that the V-shaped bracket moves up and down around the rotating shaft 232 to accelerate the falling of the material.

Referring to fig. 1, in some embodiments, the bag opener 230 further comprises a cushioning support 238. A cushion support 238 is disposed between the frame 237 and the bracket 231. The damping support 238 may be a spring, rubber, or the like to provide a damping effect during movement of the carriage 231.

In some embodiments, the bag opener 230 further comprises a knife drive configured to drive the knife 235 to move relative to the carriage 231. Specifically, in the embodiment shown in fig. 2, the cutter driving means is a cutter pull-back cylinder 236, and the cutter pull-back cylinder 236 is used to move the cutter 235 upward along the gap of the V-shaped bracket to form the tear.

Referring to fig. 3, in some embodiments, the bag grasping device 240 includes a bag tying mechanism 241. The bag-binding mechanism 241 includes a bag-binding arm 2411 and at least one bag-binding claw 2413 provided on the bag-binding arm 2411, and the bag-binding claw 2413 is swingably provided with respect to the bag-binding arm 2411 to bind into the package.

In some embodiments, the bag-tying mechanism 241 further includes a connection block 2416. The connector block 2416 is movably attached to the tie arm 2411. And the bagging claw 2413 is connected to the connecting block 2416. Specifically, as shown in fig. 3, the connecting block 2416 is connected to the bag-binding arm 2411 through the bag-binding arm cylinder 2412, and when a bag needs to be grasped, the bag-binding arm cylinder 2412 needs to be controlled to operate to control the connecting block 2416 to move downward relative to the bag-binding arm 2411 in the length direction of the bag-binding arm 2411 so as to approach the bag, and then the bag-binding claw 2413 is controlled to swing so as to bind into the bag. When the packaging bag is grasped and the material is discharged, the bag binding arm cylinder 2412 can be controlled to act to enable the connecting block 2416 to move upwards, so that the bag binding claw 2413 takes the packaging bag to move upwards to complete the complete separation of the packaging bag and the material. The bag-feeding mechanism 242 then moves the bag-bundling mechanism 241 to above the bag-dropping hopper 244 to complete the bag-collecting.

Referring to fig. 3, in some embodiments, the bag capture device 240 further includes a bag feed mechanism 242. The bag feeding mechanism 242 comprises a slide rail 2424 and a slide block 2423, the slide block 2423 is connected with the bag binding arm 2411, and the slide block 2423 is movably disposed on the slide rail 2424 to drive the bag binding mechanism 241 to move in the length direction. When the packaging bag needs to be grabbed, the slide block 2423 needs to be controlled to move rightwards along the slide rail 2424 to drive the bag binding mechanism 241 to move towards the direction of the bag opening device 230. When the grabbing of the packaging bag is completed and the packaging bag needs to be recovered, the slide block 2423 needs to be controlled to move leftwards along the slide rail 2424 to drive the bag binding mechanism 241 to move towards the bag falling hopper 244.

In some embodiments, the bag grabber 240 further comprises a bag dropping funnel 244, the bag dropping funnel 244 being disposed below the bag tying mechanism 241 to receive an empty bag.

In some embodiments, the automatic bag opening system further comprises a dust bin 210. The dust box 210 has a feed inlet and a dust suction opening at the top end. The material bag conveying device 220 is disposed in the dust removing box 210 and located at the material inlet to receive the material bag input from the material inlet. Both the bag opening device 230 and the bag grasping device 240 are located inside the dust box 210, and the dust suction port is configured to be connected with a dust collector to suck dust.

In some embodiments, the automatic bag opening system includes a controller 260 and a position detector disposed on the tray 231, and when the position detector detects that the material bag is conveyed to the tray 231, the controller 260 controls the bag grasping device 241 to grasp the packaging bag and controls the cutter 235 to cut the packaging bag to drop the material.

In some embodiments, the position detector is a pressure switch. Specifically, the pressure switch is located at the lower side of the bracket 231, so that after the material bag 400 is transferred from the material bag transfer device 220 to the bracket 231 and the material bag 400 protrudes from the gap of the bracket 231, the pressure switch detects the material bag 400, and then the cutting knife 235 is operated under the control of the controller 260.

In some embodiments, the automatic bag opening system includes a controller 260 and a material delivery device 250. The material conveying device 250 includes a material conveyor and a material level detecting member disposed on the material conveyor. The material conveyor is located below the bag opening device and used for receiving materials falling from the material bags and conveying the materials to the outlet, the material level detection piece is used for detecting the material level of the materials on the material conveyor, and the controller controls the material bag conveying device 220 to act according to the material level detected by the material level detection piece so as to convey the next material bag to the bracket 231.

The embodiment of the invention also provides a control method of the automatic bag opening system based on the embodiment. The control method comprises the following steps:

controlling the material conveying device 220 to act to convey the material bag 400 onto the bracket 231;

when the position detecting member detects that the material bag 400 arrives at the bracket 231, the bag grasping device 240 is controlled to act to grasp the packaging bag; and

the cutter 235 is controlled to move relative to the bracket 231 to cut the packaging bag and drop the material.

According to the control method, the position of the material bag 400 is monitored by arranging the position detection piece, and the bag grabbing device and the cutting knife are automatically controlled to move according to the position monitoring signal so as to realize full automation of bag opening.

To speed up the fall of the material, in some embodiments, the control method further comprises controlling the carriage 231 to move up and down to create a shake of the material bag during the fall of the material.

In some embodiments, the bag grasping device 240 includes a bag binding mechanism 241, the bag binding mechanism 241 includes a bag binding arm 2411, a connecting block movably connected to the bag binding arm 2411, and at least one bag binding claw 2413 swingably connected to the connecting block, and after the material falls for a predetermined period of time, the connecting block is controlled to move upward to drive the bag to move upward to hang in the air, and then the bag binding claw 2413 is controlled to swing multiple times. When the packaging bag moves upwards and is suspended, the bag binding claw 2413 is controlled to swing for multiple times in a small amplitude so as to shake the packaging bag, and further the purpose of thoroughly shaking the residual materials in the packaging bag is achieved.

The structure and operation of the automatic bag opening system according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 3.

As shown in fig. 1, the automatic bag opening system 200 includes a dust box 210, a material bag conveying device 220, a bag opening device 230, a bag grasping device 240, a material conveying device 250, a controller 260, and a detection assembly.

The dust box 210 has a feed opening at a side surface and a dust suction opening at a top surface. And a feeding spring door 211 is provided at the feeding port. The feeding spring door 211 is normally closed, and when a material bag 400, such as a tobacco stalk bag, is conveyed to the feeding port by the upstream belt conveyor 100, the material bag 400 pushes the feeding spring door 211 open, and the feeding spring door is closed again after the material bag completely enters. A dust suction pipe 280 is installed at the dust suction port, and the dust suction pipe 280 is connected to a dust collector of the dust collection room so that the inside of the dust collection box 210 is a negative pressure.

The material bag conveying device 220 is disposed in the dust box 210 and at the feed inlet to receive the material bag 400 conveyed by the upstream belt conveyor 100.

The bag opening device 230 includes a frame 237, a bracket 231, a rotating shaft 232, a bracket cylinder 233, a cutting knife holder 234, a cutting knife 235, a cutting knife pullback cylinder 236, and a buffer support 238. Specifically, the bracket 231 of the present embodiment is a V-shaped bracket, and the structure is shown in fig. 2. The V-shaped bracket includes a plurality of V-shaped rods spaced in a width direction, so that when the material bag 400 falls down onto the V-shaped bracket, the V-shaped rods of the V-shaped bracket support the material bag 400, and a portion of the material bag 400 located in a gap between two adjacent V-shaped rods protrudes to a lower side of the V-shaped bracket.

As shown in fig. 2, the bag opener 230 includes two cutter holders 234 arranged symmetrically. Each of the cutter holders 234 is provided with a plurality of cutters which are disposed corresponding to gaps between the V-bars of the V-shaped brackets. In the embodiment shown in fig. 2 in particular, three cutters are provided on each cutter holder 234. When the cutter holder 234 is reset, two adjacent cutters are crossed and close to each other, and the package is cut by the same cut and extends upwards along the V-shaped bracket, so that the cut large enough to enable materials such as tobacco stems to fall smoothly is ensured. And the actions of the two cutting blade holders 234 are synchronously controlled to respectively cut the protruding parts of the material bags held by the V-shaped bracket, which protrude to the lower side of the V-shaped bracket.

The cushioned support 38 is used to support the V-shaped carrier during shutdown or most of the time during production. The cushion support 38 is fixed to the frame 237. The shaft 32 is positioned on the frame 237 by a bearing mount and is rotatable about an axis.

The bag-grasping device 240 comprises a bag-tying mechanism 241, a bag-feeding mechanism 242, a partition 243 and a bag-dropping funnel 244. The bag-binding mechanism 241 comprises a bag-binding arm 2411, a bag-binding arm cylinder 2412, a bag-binding claw 2413, a baffle 2414, a bag-binding claw cylinder 2415 and a connecting block 2416.

The bag feeding mechanism 242 comprises a speed reducer 2421, a toothed belt type electric cylinder 2422, a sliding block 2423 and a sliding rail 2424, the sliding block 2423 is arranged on the sliding rail 2424 in a sliding mode, and the speed reducer 2421 drives the sliding block 2423 to move along the sliding rail 2424 through the toothed belt type electric cylinder 2422. The bag binding arm 2411 is connected to the slide block 2423, so that the slide block 2423 can move along the slide rail 2424 to realize the horizontal reciprocating motion of the bag binding mechanism 41. The partition 243 is a stainless steel folded plate to prevent the bag feeding mechanism 242 from contacting the pick roller 251 due to its weight when the bag is collected. The bag dropping funnel 44 is used for collecting the packing bags.

The material conveying device 250 includes a dial roller 251 and a belt conveyor 252.

In the present embodiment, the sensing assembly includes a first sensing photocell 271, a second sensing photocell 272, a pressure switch 273, a high level sensing photocell 274, a low level sensing photocell 275, a second sensing photocell 276, a first proximity switch 277, a second proximity switch 278, a third proximity switch 279, and a fourth proximity switch 270. The controller 260 is coupled to each component in the detection assembly to receive signals transmitted by each component and control other device actions according to the signals.

Specifically, the automatic bag opening system 200 of the present embodiment works as follows:

the feed spring door 211 is normally closed to maintain the negative pressure in the dust box 210. When the material bag 400 runs to the feeding spring door 211, the material bag can be pushed open, and after the material bag 400 completely enters, the feeding spring door 211 is automatically closed. The material bags 400 enter the dust box 210 and are transported by the material bag transporting device 220.

The first detecting photocell 271 is arranged on the material bag conveying device 220 and used for detecting whether a material bag enters the material bag conveying device 220. When the first detecting photoelectric tube 271 detects the material bag 400, the first detecting photoelectric tube 271 sends the in-place signal to the controller 260, and the controller controls the material bag conveying device 220 to operate according to the in-place signal.

The second detection photoelectric tube 272 is positioned above the V-shaped bracket, and the horizontal distance between the second detection photoelectric tube 272 and the end part of the material bag conveying device 220 is 1/4-1/3 of the length of the material bag conveying device. When the second detecting photocell 272 detects a material bag, it indicates that there is a material bag extending from the material bag feeding device 220 and extending to the V-shaped bracket, and therefore, the controller 260 controls the material bag feeding device 220 to stop operating according to the detecting signal of the second detecting photocell 272. In the process of conveying the material bags by the material bag conveying device 220, the component force of the gravity of the material bag at the front part of the V-shaped bracket 31 and the forward friction force of the material bag conveying device 220 on the material bag at the rear part are utilized to jointly prompt the whole material bag to be quickly conveyed to the V-shaped bracket 31. The buffer carriage 38 maintains support for the V-shaped carriage 31 during the shutdown phase and most of the operating time. Only after the material bag is cut, the bracket air cylinder 33 acts to move the V-shaped bracket 31 up and down around the rotating shaft 32 to accelerate the falling of the material.

The pressure switch 273 is fixed on the V-shaped bracket, when the pressure switch 273 detects that the material bag triggers the bag grabbing device 240, the speed reducer 2421 is powered on, the sliding block 2423 horizontally runs rightwards along the sliding rail 2424 through the toothed belt type electric cylinder 2422, and the bag grabbing mechanism 241 fixed on the sliding block 2423 is driven to synchronously run. The left and right limit of the bag bundling mechanism 241 is controlled by a limit switch on the toothed belt type electric cylinder 2422. The first proximity switch 277 and the second proximity switch 278 respectively limit the left end and the right end of the bag feeding mechanism 242. The second proximity switch 278 may trigger actuation of the bag tie arm cylinder 2412 to lower the connector block 2416 for access to the bags. Then, the rod of the bag binding claw cylinder 2415 extends to the position of the third proximity switch 279, so that the bag binding claw 2413 rotates around the pin shaft and binds into the packaging bag, and the top of the packaging bag is firmly hooked. Specifically, as shown in fig. 4, two blocking plates 2414 respectively clamp the top of the packaging bag 410 from both sides, and the blocking plates 2414 are provided with a plurality of through holes for allowing the bag binding claws 2413 to penetrate therethrough. The bag binding claw 2413 can pass through the through hole on the baffle 2414 to hook the packaging bag 410 firmly. The bag binding claw cylinder 2415 reciprocates between the third proximity switch 279 and the fourth proximity switch 270, and can stretch the bag binding claw 2413 for n times in a small amplitude so as to realize the purpose of shaking the packaging bag to thoroughly shake the residual tobacco stems in the packaging bag. As shown in fig. 5, the bag-binding claw cylinder 2415 is contracted to reset the bag-binding claw 2413 to retract from the through hole of the baffle 2414, the packaging bag falls to the bag-dropping funnel 244 due to the blocking of the baffle 2414 and the dragging of the non-bag-binding claw 2413, and the second detection photoelectric tube 276 is used for detecting whether the packaging bag is accurately separated from the bag-binding claw 2413 and successfully falls into the bag-dropping funnel 244.

After the bag bundling mechanism 241 hooks the packaging bag for a certain time, the cutting knife pull-back cylinder 234 acts, the cutting knife rest 234 pulls the six cutting knives 235 to cut the packaging bag upwards from the bottom along the V-shaped bracket for 3 openings, and the material falls immediately. The dust in the dust box 210 is sucked through the dust removing pipe 280.

The material in the material bag 400 falls from the opening and then falls onto the material conveying device 250. The poking rollers 251 of the material conveying device 250 are used for uniformly and constantly poking the material conveyed by the belt conveyor 252 to the downstream conveyor 300. When the high material level detection photoelectric tube 274 and the low material level detection photoelectric tube 275 detect that the material level of the material is low, the material bag conveying device 220 is triggered to start, and the next bag opening operation flow is carried out.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. An automatic bag opening system, comprising:

the material bag conveying device (220) is used for conveying material bags (400), and the material bags (400) comprise packaging bags and materials filled in the packaging bags;

the bag opening device (230) comprises a frame (237), a bracket (231) and a cutter (235), the frame (237) is fixedly arranged, the bracket (231) is arranged on the frame (237) and is positioned at the downstream of the material bag conveying device (220) to receive the material bag (400), the bracket (231) comprises at least two supporting rods (2311) which are arranged at intervals in the width direction, and the cutter (235) is positioned at a gap between the two adjacent supporting rods (2311) and is movably arranged relative to the bracket (231) to cut the packaging bag; and

and the bag grabbing device (240) is arranged above the bag opening device (230) and is used for grabbing the packaging bag.

2. The automatic bag opening system of claim 1, wherein the bracket (231) comprises a V-shaped bracket and comprises at least two V-shaped support bars spaced apart in a width direction.

3. The automatic bag opening system of claim 2 wherein one end of said V-shaped bracket is rotatably connected to said frame (237).

4. The automatic bag opening system of claim 1, wherein the bag opening device (230) further comprises a buffer support (238), the buffer support (238) being disposed between the frame (237) and the bracket (231).

5. The automatic bag opening system of claim 1, wherein the bag opening device (230) further comprises a knife drive configured to drive the knife (235) to move relative to the carriage (231).

6. The automatic bag opening system according to claim 1, wherein the bag grasping device (240) comprises a bag binding mechanism (241), the bag binding mechanism (241) comprises a bag binding arm (2411) and at least one bag binding claw (2413) provided on the bag binding arm (2411), and the bag binding claw (2413) is swingably provided with respect to the bag binding arm (2411) to bind into the packaging bag.

7. The automatic bag opening system of claim 6, wherein the bag tying mechanism (241) further comprises a connecting block movably connected to the tying arm (2411), and the tying claw (2413) is connected to the connecting block.

8. The automatic bag opening system according to claim 6, wherein the bag holding device (240) further comprises a bag feeding mechanism (242), the bag feeding mechanism (242) comprises a slide rail (2424) and a slide block (2423) extending in the length direction, the slide block (2423) is connected with the bag binding arm (2411), and the slide block (2423) is movably arranged on the slide rail (2424) to drive the bag binding mechanism (241) to move in the length direction.

9. The automatic bag opening system of claim 6, wherein the bag grasping device (240) further comprises a bag dropping funnel (244), the bag dropping funnel (244) being disposed below the bag tying mechanism (241) to receive an empty packaging bag.

10. The automatic bag opening system according to claim 1, further comprising a dust box (210), wherein the dust box (210) has a feed inlet and a dust suction port at the top end, the material bag conveying device (220) is disposed in the dust box (210) and located at the feed inlet to receive the material bag input from the feed inlet, the bag opening device and the bag grasping device are both located in the dust box, and the dust suction port is configured to be connected with a dust collector to suck away dust.

11. The automatic bag opening system according to claim 1, wherein the automatic bag opening system comprises a controller (260) and a position detecting member arranged on the bracket (231), when the position detecting member detects that the material bag is conveyed onto the bracket (231), the controller (260) controls the bag grabbing device (241) to act to grab the packaging bag and controls the cutter to act to cut the packaging bag to enable the material to fall.

12. The automatic bag opening system of claim 11, wherein the position detector is a pressure switch.

13. The automatic bag opening system of claim 1, comprising a controller (260) and a material conveying device (250), wherein the material conveying device (250) comprises a material conveyor and a material level detecting element arranged on the material conveyor, the material conveyor is located below the bag opening device to receive the material falling from the material bag and convey the material to an outlet, the material level detecting element is used for detecting the material level of the material on the material conveyor, and the controller controls the material bag conveying device (220) to act according to the material level detected by the material level detecting element so as to convey the next material bag to the bracket.

14. The automatic bag opening system of claim 1, wherein the automatic bag opening system is a tobacco stem bag automatic opening system.

15. A control method of an automatic bag opening system based on claims 1 to 14, characterized by comprising the following steps:

16. The method for controlling an automatic bag opening system according to claim 15, further comprising: the bracket is controlled to move up and down to form shaking of the material bag during the falling of the material.

17. The control method of the automatic bag opening system according to claim 15, wherein the bag grasping device (240) comprises a bag binding mechanism (241), the bag binding mechanism (241) comprises a bag binding arm (2411), a connecting block and at least one bag binding claw (2413), the connecting block is movably connected to the bag binding arm (2411), the bag binding claw (2413) is swingably connected to the connecting block, after the material falls for a preset time period, the connecting block is controlled to move upwards to drive the packaging bag to move upwards to suspend, and then the bag binding claw (2413) is controlled to swing for multiple times.