CN109775064A - A kind of stem folding device of polybag - Google Patents

Abstract

The invention discloses a kind of stem folding devices of polybag, pallet body mainly is turned over including rack, polybag conveying device, pressure lever mechanism, handle, pallet longitudinal movement device, fold supporting plate mechanism, folds rushing board mechanism, polybag pressing device, it is characterised in that: is folded in two handles for folding rushing board mechanism and is additionally provided with L-type rushing board mechanism and push plate driving mechanism between push plate.The beneficial effect is that: the motion amplitude that handle folds push plate can be largely reduced, so that entire machine construction is compact；Two handles of polybag can be intersected and be folded, tied up securely；The handle of the prior art is folded into pushing away for push plate and rolls over the function that functional shift is holding plastic bags, improves the fold reliability of fold supporting plate.

Description

A kind of stem folding device of polybag

Technical field

The present invention relates to a kind of stem folding devices of polybag.

Background technique

Polybag according to the present invention refer to tool there are two the convenient bag of handle state, also referred to as plastic bag, shopping bag, one As be to be processed automatically by Bag Making Machine, Bag Making Machine will export at regular intervals a pile or two pile polybags, general tens Item is a pile.For convenient for storage, transport, sale, use, these polybags in a pile generally also need to roll over by three to four times It is folded, it is eventually folded to strip, is then tied up or is packaged into packaging bag.The form and its folding process of polybag are as schemed Shown in 4 and Fig. 5: being rolled over respectively in the position of handle fold line 91 to centre firstly the need of by two handles 90 of two polybags It is folded, so that two handles 90 is hung together, be folded into state as shown in Figure 5, this is the first fold；Then again in stem Position shown in fold line 92 is folded back again once just completes the stem folding of the polybag, because this is folded twice It is the folding for the previous section of polybag, so above-mentioned first time and second fold are traditionally referred to as " stem Fold ", structure relevant to the folding of the stem of polybag is referred to as " stem folding device ".It is also wanted after the completion of stem folds Third time folding is carried out, polybag longer for length will also carry out the 4th folding, because this is to behind polybag Part is folded, so the folding of this third time or the 4th folding are traditionally referred to as " tail portion folding ".

For the folding of polybag, maximum difficulty is exactly that stem folds, the especially folding to two handles.Cause The middle position of polybag is only tied for tie string, this just needs to fold the handle of two polybags to centre and is allowed to intersect It hangs together, only in this way tie string could be pricked to live two handles, avoid polybag two handles in transport, handling process It scatters.And it is biggish that two handles of polybag, which are intersected the difficulty that hangs together,.The applicant is also once disclosed Patent No. 201110081121 entitled " handle folding device of full-automatic plastic bag folding strapper " (hereinafter referred to as documents 1) Patent application.Comprising: rack；The compression bar machine that compression bar and resetting apparatus and compression bar turnover device etc. are constituted is folded by handle Structure；Handle equipped with V-type overturning mouth turns over pallet body；Pallet longitudinal movement device；Supporting plate and supporting plate overturning are turned down by handle The fold supporting plate mechanism of the compositions such as device and pallet support spring, plate supporting frame；Push plate is folded by two handles and handle folds The folding rushing board mechanism that push plate telecontrol equipment is constituted；It is made of polybag pressing plate and handle pressing plate, pressing plate frame and its driving mechanism Polybag pressing device.But documents 1 are to fold push plate using two handles to push away from the left and right sides of polybag to centre Folding, because the length that handle folds push plate is longer, the length that each handle folds push plate has to be larger than the two of polybag width / mono-, when two push plates move back and forth, the stroke moved back and forth also has to be larger than the half of polybag width, and two The stroke that a push plate adds up just is greater than the width of polybag, causes the volume of folding machine wider, especially with two-wire plastics Away from too wide, this not only needs folding machine itself to need to widen, it is also necessary to match therewith at the center of two groups of folding units of bag folding machine The Bag Making Machine of conjunction also needs correspondingly to widen.This causes complete equipment bulky, and structure is complicated, and manufacturing cost height etc. is many to ask Topic.Another problem is: two handles 90 of polybag have to mutually hang together when folding, i.e., a handle 90 is pressed in On another handle 90, state as shown in Figure 5 is formed.Only in this way when being tied up to the polybag folded up, bundle Jag can just be bundled in the middle position that two handles 90 hang together, and also only in this way, tie string could be by two handles 90 It ties simultaneously.In order to enable two handles to hang together, two handles in documents 1 need to only be rolled in theory Folded push plate lengthens, and it is staggeredly corresponding so that two handles is folded push plate one high and one low.But it thus but causes more not The problem of benefit: one is the amplitude that handle folds push plate campaign is bigger, keep the volume of machine huger；The second is comparison text It is provided with supporting plate spring on the handle fold bracket of part 1, be hinged on handle fold bracket on front side of handle fold supporting plate , after two handles folding push plates are all released to centre, the rear side for turning down supporting plate can be by the predetermined fold line position of polybag It sets to clamp and folds the rear side of push plate in two handles, when overturning supporting plate folds push plates together with two handles and overturns, One of neat fold line will be formed in nipped position.And if handle folding push plate is designed to one high and one low Words even misplace then the position that the fold supporting plate clamps polybag cannot become straight line.

A kind of stem folding device that application publication number CN109264120 discloses a kind of polybag (hereinafter referred to as compares File 2) comprising rack, folding turnover, bag pressing crotch, pressing plate, pressing plate driving mechanism, slide unit, impression plate, it is characterised in that: Adjustable supporting plate mechanism and UXing Tui folded plate mechanism are additionally provided on the slide unit.Although the U-shaped folded plate that pushes away of documents 2 reduces Push plate pushes away the amplitude problem of folding to two sides, also two handles of polybag can hang together, but also bring ask as follows simultaneously Topic: first, when the biography bag gripper clamp (i.e. manipulator) of plastic bag folding press passes through polybag to folding below trapezoidal pressing plate Operating position after, the first step of folding work first is exactly that trapezoidal press plate mechanism is moved down and is pressed on folding turnover, and terraced Shape pressing plate pushing interfere pass bag manipulator return, so can only wait until passes bag machinery hand down polybag return after it is trapezoidal Pressing plate starts to move down again, and this waiting will seriously affect folding rate, reduces working efficiency, and present bag folding machine is all It is high speed, bag folding machine can only be cooperated in a manner of reducing speed；Second, it is by bag pressing during the fold of folding turnover Crotch stays in two Billfold with handle of polybag on folding turnover, and the release time of bag pressing crotch is difficult to adjust, if released The fold that will hinder folding turnover too late is put, or even polybag can be injured, if discharging too early, two to have hung together Handle is easy sagging or scatters；And the big ting model of polybag is different, and thickness is different, and the material of polybag and elasticity are not yet To the greatest extent it is identical, its inertia force is different under the action of the overturning centrifugal force of folding turnover, thus the adjustment of bag pressing crotch be through Perseverance, and be difficult to adjust；The front of polybag is clamped when bag pressing crotch and is then turned over folding on folding turnover by third When plate folds backward together, the bag pressing crotch is unable to stem fold line position of the rear side to polybag of refolding turnover panel It sets to form folding line, so, even fold is also easy to lift in the past but because the elasticity of polybag is larger, this will seriously affect folding Reliability and stability.

Summary of the invention

The technical problems to be solved by the present invention are: a kind of stem folding device of polybag, applies and folds in polybag On machine, provided for plastic bag folding press a kind of compact-sized, the polybag for adapting to different width specifications folds a kind of desired modeling The stem folding device of material bag.

To realize the above-mentioned technical purpose, the technical scheme is that a kind of stem folding device of polybag, including machine Frame, polybag conveying device, pressure lever mechanism, handle turn over pallet body, pallet longitudinal movement device, fold supporting plate mechanism, folding Folded rushing board mechanism, polybag pressing device, it is characterised in that: folded between push plate in two handles for folding rushing board mechanism It is additionally provided with L-type rushing board mechanism, the L-type rushing board mechanism includes L-type push plate and push plate driving mechanism, the push plate driving machine Structure is arranged on the pallet longitudinal motion mechanism.

The L-type push plate always sees that being in two handles folds between push plates from right and left, always seen from upper and lower from It is folded between the upper surface of compression bar in the handle that handle turns over pallet and is pressed on fold supporting plate, one end is connected to the push plate In driving mechanism, it can move back and forth with pallet longitudinal movement device relative to fold supporting plate.In the L-type push plate " L " is a digital code, and the specific embodiment of the L-type push plate is not limited to L-type, and form is diversification 's.

The L-type push plate is at least arranged two as a preferred technical solution, and the L-type push plate can be divided into work The face height of face and joint face two parts, described two L-type push plates is different, the following table of one of L-type push plate working face Face is higher than the upper surface of another L-type push plate working face, and the joint face of two L-type push plates is connected to described push away In plate driving mechanism.Two L-type push plates can turn over two sides below pallet from the handle and bypass the handle Compression bar is folded, folds the upper surface of compression bar to intermediary movements from the handle, and the working face of two L-type push plates can be described Handle folds the upper surface of compression bar and is overlapping together.

The working face of the L-type push plate refers to the one side of laterally accessible horizontality above, is rolled over the handle The substantially parallel part of folded push plate, the joint face refer to the one side of upper and lower longitudinal perpendicular, are and the push plate driving machine The part that structure is connected.Why L-type push plate is divided into working face and joint face, primarily to convenient for description, be easy to understand, It can actually be integrated design.From the point of view of left side, the working face and joint face of the L-type push plate are constituted and are similar to The plate body of one inverted L shape.

The L-type push plate is also similar to that an inverted L shape in terms of positive side, the working face of the L-type push plate and described Fold rushing board mechanism handle fold push plate it is parallel, two L-type push plates be located at two described in handle fold push plate it Between.

The push plate driving mechanism is mainly made of guide rail, sliding block, cylinder as a preferred technical solution, described Guide rail is located on the pallet longitudinal movement device, and two L-type push plates pass through sliding block respectively and are connected to described lead On rail, the cylinder is connected in the L-type push plate.

As another embodiment of L-type rushing board mechanism, the L-type rushing board mechanism mainly by two L-type push plates and Slider cylinder is constituted, and two L-type push plates are mounted respectively on the slide unit of slider cylinder, and the slider cylinder setting exists On the pallet longitudinal movement device.

It is also set on the back location of the polybag pressing plate of the polybag pressing device as a preferred technical solution, There is squeeze board.For the rearward position compacting of the handle fold supporting plate to polybag, because in the clamping of polybag conveying device Polybag is easy to produce the strand shape striped on some front-rear directions in the clamping of pincers and transmission process, lower on these stripeds Volt, influences the folding to polybag.Pushing for the squeeze board can comfort the striped in the compacting of stem fold line position It is flat, it can also make to be slightly below previous section behind the stem fold line position of polybag, convenient for folding.

The tail portion also to be carried out after folding for stem folds, and generally also to carry out third time or the 4th folding, and And the mode that tail portion folds is varied, such as plate, guide plate, clamping device, folding pressing plate etc..The present invention is actually wanted The technical issues of solution is mainly the stem folding problem to polybag, and the stem folding device can be with corresponding tail portion Folding device completes the folding work of polybag together, both can be applied in plastic bag folding press, also can be applied to plastics In the auto-folder strapper of bag.

Pressure lever mechanism described in the embodiment of the present invention, handle turn over pallet, fold supporting plate mechanism, fold rushing board mechanism, L Type rushing board mechanism etc. constitutes one group, can match with single pass Bag Making Machine, punching machine etc., primary only to fold a pile plastics Bag.If together by above-mentioned Liang Zu mechanism transverse direction Juxtaposition and Superimposition, two L-type push plates of the same side are connected with connecting rod respectively, It does not need to can be formed by two groups of folding devices in the case where increasing number of cylinders, it can be with twin-channel Bag Making Machine, punching machine It matches, two pile polybags can be once folded simultaneously, to improve production efficiency.

Compared with prior art, the present invention has the following advantages: compared with documents 1: first, with width phase Relatively narrow L-type push plate is implemented to fold two handles of polybag, was both pushed away instead of handle folding in documents 1 The function of plate, and the amplitude moved back and forth to correspondingly both sides becomes smaller, and this makes compact overall structure；Second, described two Two handles of polybag can be folded up and two handle intersections can be made to hang together by a L-type push plate, realize Handle truly folds.Compared with documents 2: firstly, the gripper clamp in the polybag conveying mechanism will After polybag is placed into folded operative position, handle folds the handle fold line position that compression bar is pressed in polybag with regard to overturning at once On, and then the L-type push plate and handle folding push plate push away to the handle of polybag and be folded, and these folding movements It all will not influence the return of manipulator, although polybag pressing device moves down the return that will affect manipulator, at this In the technical solution of invention, the pushing of polybag pressing device is being pressed from both sides after the completion of two handles are pushed away folding by two L-type push rods Hold after pincers return and just carry out, the time of return of the gripper clamp that has been staggered, thus make polybag folding work and The transportation work of polybag is non-interference, make the folding work of polybag and transportation work be divided into two working faces come simultaneously into Row, something which increases folding rates and working efficiency；Second, the rushing board mechanism, although its structure and shape State and folding rushing board mechanism described in documents 1 are essentially identical, but basic variation functionally has occurred, the folding The effect that two handles of folded rushing board mechanism fold push plate has been folded up for clamping in the inventive solutions Two handles come are not easy to scatter during fold.Compared with bag pressing crotch, two handles fold push plate and will take for this Two handles together are clamped and are overturn, and can reliably be folded to the handle of polybag, curved without regard to bag pressing The release problem of hook；Third, the handle, which folds push plate, to clamp the pre- of polybag together with the fold pallet Determine fold line position, makes the predetermined fold line position of polybag implement to squeeze during the fold of fold supporting plate, clamps, pressing from both sides It is turned down again in the case where firmly, so that the predetermined fold line position of polybag be made to form certain folding line, improves the steady of folding It is qualitative.This is that the bag pressing crotch of documents 2 cannot achieve.

Detailed description of the invention

Fig. 1 is the structural principle top view of embodiment one；

Fig. 2 is the structural principle positive side schematic diagram of embodiment one；

Fig. 3 is the structural principle leftschematic diagram of LXing Tuizhe mechanism；

Fig. 4 is the basic structure schematic diagram of polybag；

Fig. 5 is the folding mode and folding step schematic diagram of polybag；

Fig. 6 to Figure 10 is the working principle of the invention and work step schematic diagram.

In figure: 1- rack；11- polybag conveying device；111- delivery track；112-- gripper clamp；The tail portion 12- folds dress It sets；2- pressure lever mechanism；21- handle folds compression bar；22- splined shaft；23- oscillating cylinder；24- pressure arm；3- handle turns over pallet machine Structure；31- handle turns over pallet；32- guide rail；4- pallet longitudinal movement device；41- tray rack drives cylinder；42- tray rack；43- Pallet frame sliding track；44- sliding block；5- turns down supporting plate mechanism；51- turns down supporting plate；52- oscillating cylinder；53- supporting plate shaft；6- handle Fold rushing board mechanism；60- handle folds push plate；61- push plate guide rail；62- push plate sliding block；7- polybag pressing device；71- plastics Bag pressing plate；72- handle pressing plate；73- squeeze board；74-- pressing plate cylinder；75- double-rod cylinder；8-L type rushing board mechanism；81-L type pushes away Plate；811-- working face；812- joint face；82- guide rail；83- sliding block；84- cylinder；9- polybag；90- handle；91-- handle folding Superimposing thread；92- stem fold line.

Specific embodiment

As shown in Figures 1 to 10, the left side of attached drawing is exactly front of the present invention, and the right of attached drawing is exactly institute of the present invention Behind stating；The upper surface of attached drawing is exactly the right side of the present invention, is exactly the left side of the present invention below attached drawing.In order to complete Face discloses technical solution of the present invention, and the present invention is specifically described below by embodiment.

Embodiment, as shown in Figure 1, Figure 2, Figure 3 shows: a tray rack sliding rail being installed before and after the front part sides difference of rack 1 43, a tray rack 42 is set, in the left and right sides of tray rack 42 one sliding block 44 is installed respectively, tray rack 42 is made to pass through sliding block 44 are slidably mounted on two tray rack sliding rails 43, in one cylinder 41 of installed in front of tray rack 42, the cylinder block of cylinder 41 It is mounted in rack 1；One guide rail 32 of left and right installation on the front side of tray rack 42, sliding is pacified respectively for left and right on guide rail 32 It fills a handle and turns over pallet 31, enable to turn over pallet 31 and horizontally slip on guide rail 32 and a certain position can be fixed on It sets；Left and right is transversely mounted a splined shaft 22 on the position of tray rack 42 behind the guide rail 32, connects one end of splined shaft 22 The oscillating cylinder 23 connect, the ontology of oscillating cylinder 23 are mounted on the side of tray rack 42；Pass through in the middle position of splined shaft 22 Be slidably installed two handles of spline housing fold compression bars 21, make two handles fold compression bars 21 be in two handles turn over pallet 31 it Between, two handles can be driven to fold 21 front and back reciprocally swinging 180 degree of compression bar when oscillating cylinder 23 works.After tray rack 42 Side or so is transversely mounted a guide rail 82, two L-type push plates is arranged, 81 push plate of L-type is by working face 811 and joint face 812 are constituted, and the working face 811 is exactly the position for implementing push away to the handle 90 of polybag folding, can touch plastics The part of bag, it is parallel that working face 811 all generally folds push plate 60 with handle in back and forth and right and left directions；The connection Face 812 is upright state, is the part being connected with the guide rail 82 of LXing Tuizhe mechanism and sliding block 83, by the company of two L-type push plates The height of 812 part of junction is arranged to one high and one low, and the lower surface of the working face 811 of a L-type push plate is made to be higher than another L-type The upper surface of the working face 811 of push plate makes to be overlapping up and down after movement among 811 county of working face of two L-type push plates Together, i.e. for a working face 811 above, another working face 811 is below；By the joint face 812 of two L-type push plates 81 It is upper that a sliding block 83 is installed respectively, it is slidably mounted on two L-type push plates 81 on guide rail 82 by sliding block 93；It is pushed away in two L-types It is separately connected cylinder 84 on the joint face 812 of plate 81,84 sub-cylinder body of cylinder is mounted on tray rack 42；Sliding block 83 is distinguished The outside of L-type push plate joint face 812 is set, so that the working face 811 of two L-type push plates 81 is in handle respectively and turns over pallet 31 Outside and handle fold push plate 60 between, two L-types when about 811 working face of two L-type push plates 81 overlaps The joint face 812 and sliding block 83 of push plate are also in two side positions that two handles fold compression bar 21, that is to say, that when two L-types push away Plate 81 is all to centre movement and when so that about 811 working face is overlaped, at the working face 811 of two L-type push plates The upper surface of compression bar 21 is folded in two handles, and its joint face 812 and sliding block 83 are in two that two handles fold compression bar 21 Side, as shown in Figure 3.Two side position of rack is rotatablely installed a supporting plate shaft 53 behind tray rack 42, in supporting plate shaft 53 Upside install a plate supporting frame, the front side of supporting plate 51 is hingedly turned down on front side of the centre of plate supporting frame, after turning down supporting plate 51 One support spring is installed between side and plate supporting frame；A guide rail is installed in middle position or so before and after the plate supporting frame 61, two handles are set and fold push plate 60, the left side that sliding block is slidably mounted on guide rail 61 is passed through into one end that handle folds push plate 60 Right both ends fold in two handles and install a cylinder respectively between push plate 60 and guide rail 61.It is as shown in Figure 3: in supporting plate shaft One cylinder 74 is installed on 53 corresponding upper methods, racks, is slidably installed respectively a guide rod in the left and right sides of cylinder 74, two One pressing plate frame is installed on the lower end of a guide rod and the cylinder rod of cylinder 74, one double-rod cylinder is installed in the front of pressing plate frame 75, two handle pressing plates 72 are installed below double-rod cylinder 75；One polybag pressing plate is installed above and below the middle part of pressing plate frame 71, a squeeze board 73 is installed above and below the rear side of pressing plate frame；Tail folding device (summary) is installed at the rear of supporting plate shaft 53. It is as shown in Figure 3: two delivery tracks 111 are installed in parallel before and after the left and right sides of rack 1, it is sliding on two delivery tracks 111 Multiple gripper clamps 112 are laterally installed in dynamic left and right side by side, and gripper clamp 112 is connect with the driving mechanism of polybag conveying device, Under the driving of driving mechanism gripper clamp 112 can handle fold push plate 60 top and squeeze board 73 below between along convey 111 front-rear reciprocation movement of track.

Specific work process is as follows: when the clamped pincers 112 of pile polybag 9 of output on Bag Making Machine are clamped along delivery track After 111 are transported to folded operative position, two handles 90 of polybag 9 are in handle respectively and turn on pallet 31, firstly, swinging Cylinder 23, which opens driving splined shaft 22, makes two handles fold two handle fold lines that compression bar 21 is pressed in polybag in splayed On 91 position, so that the position of the handle fold line 91 of polybag 9 is folded compression bar 21 by handle and be pressed on handle fold supporting plate 51； At the same time, gripper clamp 112 can return at once after putting down polybag 9, fold 60 He of push plate by handle in gripper clamp 112 During the top of L-type push plate 81 returns forward, cylinder 84 can be opened, drive left side that L-type push plate 81 to the right from Handle turns over below pallet 31 and handle is folded and moved right between the upper surface of compression bar 21, that by 9 left side of polybag mentions Hand 90 pushes away to the right folding, pushes away and is converted into state as shown in Figure 7；Later, that L-type that the cylinder 84 on right side also opens driving right side pushes away Plate 81 is moved to the left, that handle 90 on right side is pushed away folding to the left, and two handles 90 is enable to hang together, then pressing plate Cylinder 74 is opened driving pressing plate frame and is moved down, and pushes down polybag pressing plate 71 in the upside of supporting plate shaft 53 position polybag 9 It sets, meanwhile, the downside of squeeze board 73 also presses downwards the position in 53 rear side of supporting plate shaft of polybag 9, makes its position quilt Compacting smooths, and slightly below turns down supporting plate 51；At the same time, double-rod cylinder 75 also opens two handle pressing plates 72 of driving in L The end of two handles 90 of the polybag 9 to hang together is pushed down and is fixed on fold supporting plate 51 by two side positions of type push plate 81 On, form state as shown in Figure 8.Later, two handles fold push plate 60 and also promote together to centre, and tray rack drives cylinder 41, which open driving tray rack 42, moves forward, and during tray rack 42 moves backward, two handles fold compression bar 21, two Handle turns over 31, two L-type push plates 81 of pallet and moves forward off fold supporting plate 51 together therewith, forms shape as shown in Figure 9 State.Folded after compression bars 21 leave fold supporting plate 51 in two handles, turn down the rear side of supporting plate 51 under the action of support spring to On lift and the position of the stem fold line 92 of polybag has been clamped in two handles folds on the rear side of push plate 60；Later, it puts Cylinder 23 of taking offence release reset drives splined shaft 22 makes two handles folding compression bars 21 fold forward 180 degree, then oscillating cylinder 52 It opens driving supporting plate shaft 53 and makes to turn down supporting plate 51 and turn over swings, because of having during turning down supporting plate 51 and foling backward Two handles fold push plate 60 and clamp the handle 90 that two of polybag fold on fold supporting plate 51, so will not It scatters；And the position of the stem fold line 92 on 51 rear side of fold supporting plate is clamped by the rear side that two handles fold push plate 60 It will form certain folding line, after fold supporting plate 51 turns down 180 degree, two handles fold push plate 60 and discharge to two sides retraction, it Afterwards, oscillating cylinder 52 discharges, and the fold revolution of supporting plate 51 resets, and the stem folding work of polybag is completed.

Claims (4)

1. a kind of stem folding device of polybag, including rack, polybag conveying device, pressure lever mechanism, handle turn over pallet Mechanism, fold supporting plate mechanism, folds rushing board mechanism, polybag pressing device at pallet longitudinal movement device, it is characterised in that: Two handles for folding rushing board mechanism fold and are additionally provided with L-type rushing board mechanism between push plate, and the L-type rushing board mechanism includes L-type push plate and push plate driving mechanism, the push plate driving mechanism are arranged on the pallet longitudinal motion mechanism.

2. a kind of stem folding device of polybag according to claim 1, it is characterised in that: the L-type push plate is extremely Two are arranged less, the L-type push plate can be divided into working face and joint face two parts, and the working face of described two L-type push plates is high To spend different, the lower surface of one of L-type push plate working face is higher than the upper surface of another L-type push plate working face, and described two A L-type push plate is separately positioned in the push plate driving mechanism.

3. a kind of stem folding device of polybag according to claim 1, it is characterised in that: the push plate driving machine Structure is mainly made of guide rail, sliding block, cylinder, and the guide rail is located on the pallet longitudinal movement device, two L Type push plate passes through sliding block respectively and is connected on the guide rail, and the cylinder is connected in the L-type push plate.

4. a kind of stem folding device of polybag according to claim 1, it is characterised in that: compressed in the polybag Squeeze board is additionally provided with behind the polybag pressing plate of device.