阅读说明：本技术 一种便于塑料袋打开的单张拿取装置 (Single taking device convenient for plastic bag to be opened ) 是由 郭安可 于 2021-04-07 设计创作，主要内容包括：本发明涉及包装用品领域,具体涉及一种便于塑料袋打开的单张拿取装置。本发明提供的一种便于塑料袋打开的单张拿取装置,旨在克服传统的塑料袋拉取装置对使用者拉扯塑料袋的长度、数量没有限制的问题。本发明公开了便于塑料袋打开的单张拿取装置,包括工作箱,所述工作箱内设有工作腔,所述工作腔内设有对包装袋进行定长拉扯的定长装置,所述定长装置包括转动设置在所述工作腔相对两侧内壁之间的螺纹杆,所述螺纹杆上螺纹连接设有两个能够相互抵触的螺纹块,所述螺纹块一侧端面上转动设有定长轴,所述定长轴上扭簧转动设有摩擦轮。(The invention relates to the field of packaging supplies, in particular to a single taking device convenient for opening a plastic bag. The invention provides a single taking device convenient for opening a plastic bag, and aims to solve the problem that the length and the number of plastic bags pulled by a user are not limited by a traditional plastic bag pulling device. The invention discloses a single taking device convenient for opening a plastic bag, which comprises a working box, wherein a working chamber is arranged in the working box, a length fixing device for fixing the length of a packaging bag is arranged in the working chamber, the length fixing device comprises a threaded rod which is rotatably arranged between the inner walls of two opposite sides of the working chamber, two threaded blocks which can be mutually abutted are in threaded connection with the threaded rod, a fixed long shaft is rotatably arranged on the end surface of one side of each threaded block, and a friction wheel is rotatably arranged on a torsion spring on the fixed long shaft.)

1. The utility model provides a device of taking of sola convenient to plastic bag is opened, includes work box (11), be equipped with working chamber (12) in work box (11), its characterized in that: be equipped with in working chamber (12) and carry out fixed length to the wrapping bag and pull fixed length device (81), fixed length device (81) are including rotating the setting and are in threaded rod (14) between the relative both sides inner wall of working chamber (12), threaded connection is equipped with two screw thread piece (45) that can conflict each other on threaded rod (14), it is equipped with fixed major axis (37) to rotate on screw thread piece (45) a side end face, it is equipped with friction pulley (38) to go up torsional spring rotation on major axis (37), fixed length device (81) are close to the wrapping bag and are drawn one side and are equipped with induction system (83) that the state was responded to the wrapping bag drawing, induction system (83) set up including rotating induction shaft (15) on working chamber (12) one side inner wall, fixed induction shaft (15) are gone up and are equipped with induction plate (22), induction plate (22) are kept away from fixed length device (81) a side end face with working chamber (12) are close to induction shaft (15) An induction spring (17) is fixedly arranged between the inner walls.

2. A single sheet take device for facilitating the opening of a plastic bag as in claim 1 wherein: the length control device (81) further comprises a discharge shaft (40) rotatably arranged on the inner wall of one side of the working chamber (12), a bag winding wheel (41) is arranged on the discharge shaft (40) in a spline mode, a plastic bag (39) is wound on the bag winding wheel (41), the working chamber (12) is far away from the inner wall of one side of the discharge shaft (40) and the end face of the corresponding side of the working chamber (12) in a penetrating mode and is provided with a penetrating port (19), the other end of the plastic bag (39) can penetrate through two friction wheels (38) and pass through the sensing plate (22) and finally penetrate out from the penetrating port (19), the threaded rod (14) is close to one side end of the ground and extends to the side, close to one side of the ground, of the working chamber (11) and is fixedly provided with an adjusting disc (13), the inner wall of one side of the working chamber (12) is close to the threaded block (45) and is provided with a positioning groove (, the thread block (45) is close to a fixing pin (44) is fixedly arranged on the end face of one side of the positioning groove (46), and the fixing pin (44) slides in the positioning groove (46).

3. A single sheet take device for facilitating the opening of a plastic bag as in claim 1 wherein: the induction device (83) also comprises a first bearing plate (23) fixedly arranged on the inner wall of the working cavity (12) close to one side of the thread block (45), a feedback shaft (34) which is rotationally connected with the first bearing plate (23) is rotationally arranged on the inner wall of one side of the working cavity (12) far away from the ground, a second bearing plate (20) is fixedly arranged on the inner wall of one side of the working cavity (12) close to the thread block (45), a one-way coupling (16) is rotationally arranged in the second bearing plate (20), a transition shaft (35) which is meshed and connected with the conical teeth of the induction shaft (15) is arranged on one side, close to the induction shaft (15), of the one-way coupling (16), one side end of the transition shaft (35) far away from the induction shaft (15) is connected with one side end of the feedback shaft (34) close to the induction shaft (15) in a one-way transmission mode through the one-way coupling (16).

4. A single sheet take device for facilitating the opening of a plastic bag as in claim 3 wherein: be equipped with on feedback axle (34) right decide major axis (37) with torsion spring carries out elasticity release (84) that elasticity potential energy released between sponge piece (18), elasticity release (84) are including fixed setting half gear (47) on feedback axle (34), be equipped with stroke groove (50) in first bearing board (23), it is equipped with slider (51) to slide in stroke groove (50), slider (51) are close to fixed curved bar (52) that is equipped with on induction plate (22) a side end face, curved bar (52) are close to induction plate (22) a side end extends to first bearing board (23) are close to ground one side and are close to fixed length device (81) a side end is fixed and are equipped with tooth case (36), tooth case (36) are close to ground one side end face and are kept away from ground one side end face and link up and are equipped with tooth chamber (48), half gear (47) are in tooth chamber (48) and can with tooth chamber (48) are close to decide tooth chamber (48) Length device (81) one side inner wall and keep away from length device (81) one side inner wall meshing, decide on major axis (37) fixed be equipped with first spur gear (43), friction pulley (38) are close to fixed be equipped with on first spur gear (43) a side end face with decide major axis (37) sliding connection's second spur gear (42), tooth case (36) are close to decide on major axis (37) a side end face symmetry and fixed two limiting plate (49) of being equipped with, limiting plate (49) can with the corresponding position first spur gear (43) and second spur gear (42) meshing.

5. A single sheet take device for facilitating the opening of a plastic bag as in claim 3 wherein: wear to be equipped with in export (19) and carry out local soaking to the wrapping bag and be convenient for open dip in wet device (82), it sets up including embedding respectively to dip in wet device (82) wear two sponge pieces (18) in export (19) relative both sides inner wall, be equipped with in work box (11) and be located work cavity (12) are kept away from water storage chamber (26) of ground one side, water storage chamber (26) are kept away from work cavity (12) one side inner wall with work box (11) are kept away from and are had a perfect understanding between ground one side inner wall and threaded connection is equipped with plug screw (30), first axle bearing plate (23) are kept away from tablet (22) a side end face with work cavity (12) are close to rotate between water storage chamber (26) one side inner wall and are equipped with driven shaft (32), driven shaft (32) with feedback shaft (34) belt connection, be equipped with in work box (11) and be located water storage chamber (26) are close to pressure chamber (25) of work cavity (12) one side ) A piston plate (27) is arranged in the pressure cavity (25) in a sliding mode, the piston plate (27) is close to a side end face of the driven shaft (32) and is fixedly provided with a piston rod (28), one side end of the piston plate (27) is far away from the piston rod (28) and extends into the working cavity (12) and is fixedly provided with a touch plate (31), a feedback shaft (34) is close to a side end face of the pressure cavity (25) and the working cavity (12) is close to a follow-up spring (29) fixedly arranged between inner walls of one side of the touch plate (31), a cam (33) capable of being abutted against the touch plate (31) is fixedly arranged on the driven shaft (32), an inner wall of one side of the driven shaft (32) is far away from the pressure cavity (25) and a water inlet hole (24) is communicated between inner walls of one side of the working cavity (12), and an inner wall of one side of the driven shaft (32) is far away from the pressure, apopore (21) are in divide into two in work box (11), two apopore (21) are respectively with two sponge piece (18) are kept away from wear export (19) a side end face and are link up, work box (11) are kept away from on length fixing device (81) a side end face about sponge piece (18) symmetry is equipped with two openings to keeping away from pull groove (53) of length fixing device (81) one side, pull groove (53) with wear export (19) and link up.

6. A single sheet take device for facilitating the opening of a plastic bag as in claim 1 wherein: working chamber (12) is kept away from screw block (45) one side inner wall with working chamber (12) is kept away from link up between screw block (45) one side inner wall and be equipped with opening and closing mouth (55), so that twine on friction pulley (38) in time change after plastic bag (39) finish of use and the initial preparation of plastic bag (39), friction pulley (38) are the rubber material, with frictional force between plastic bag (39) is great, when two friction pulley (38) extrude each other when plastic bag (39), plastic bag (39) do not take place the drunkenness under the effect of frictional force, the spring force coefficient of response spring (17) is less, can not cause the user to the difficulty of dragging of plastic bag (39), response board (22) are when reseing feedback axle (34) just rotate a week, promptly gear box (36) just accomplish a round trip cycle, when the user pulls out a fixed use length, friction pulley (38) with torsional spring between definite major axis (37) just reaches maximum turned angle, and the user can't continue to pull this moment promptly plastic bag (39) to reach the user and can only pull out at every turn plastic bag (39) use length's effect prevents when being convenient for singly take the waste of plastic bag (39), be equipped with into water check valve in inlet opening (24), be equipped with out water check valve in apopore (21).

Technical Field

The invention relates to the field of packaging supplies, in particular to a single taking device convenient for opening a plastic bag.

Background

The plastic bag is a common packaging material and is especially widely used in markets, in recent years, for environmental protection, a series of plastic limit laws are provided, the plastic bag in the markets is gradually replaced by a degradable green packaging bag, but the plastic bag is still mostly used for packaging food and vegetables.

Although the traditional plastic bag pulling device can realize pulling of plastic bags, the length and the number of the plastic bags pulled by a user are not limited, the plastic bag dividing lines of the rolls are not obvious, the user often pulls packaging bags exceeding the using number unintentionally, if the packaging bags are not utilized intentionally, the plastic bags are wasted, and meanwhile, due to the electrostatic effect, the plastic bags which are just torn are difficult to open under the condition that the fingers of the user are dry.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a single taking device convenient for opening a plastic bag, so as to solve the problem that the length and the number of plastic bags pulled by a user are not limited by the traditional plastic bag pulling device.

The invention has the technical scheme that the single taking device is convenient for opening the plastic bag.

The single taking device which is manufactured by the technical scheme of the invention and is convenient for opening the plastic bag comprises a work box, a working chamber is arranged in the working box, a length fixing device for fixing and pulling the packaging bag is arranged in the working chamber, the length control device comprises a threaded rod which is rotatably arranged between the inner walls of the two opposite sides of the working cavity, the threaded rod is provided with two thread blocks which can be mutually butted in a threaded connection way, a fixed long shaft is rotationally arranged on the end surface at one side of the thread blocks, the torsion spring on the fixed length shaft is rotationally provided with a friction wheel, the fixed length device is provided with a sensing device which senses the pulling state of the packaging bag near the pulling side of the packaging bag, the induction device comprises an induction shaft which is rotatably arranged on the inner wall of one side of the working cavity, an induction plate is fixedly arranged on the induction shaft, the induction plate is far away from one side end face of the length control device and the working cavity is close to an induction spring is fixedly arranged between the inner walls of one sides of the induction shafts.

The fixed length device is still including rotating the setting and being in play axle on the inner wall of working chamber one side, it is equipped with around the bag wheel to play epaxial spline, it is equipped with the plastic bag to take turns to around the bag, the working chamber is kept away from play axle one side inner wall with it is equipped with the mouth of wearing to link up between the working chamber corresponds the side end face, the plastic bag other end can pass two between the friction wheel and walk around the tablet finally follows wear the mouth of wearing to wear out, the threaded rod is close to a side end of ground and extends to the working box is close to ground one side and fixed adjusting disk that is equipped with, the working chamber is close to be equipped with the opening orientation on the inner wall of screw block one side and is close to the constant head tank of screw block one side, the screw block is close to the fixed pin.

The induction system is characterized in that the induction system further comprises a first bearing plate fixedly arranged on the inner wall of one side of the threaded block, the working cavity is far away from the inner wall of one side of the ground, a feedback shaft rotatably connected with the first bearing plate is arranged on the inner wall of one side of the threaded block in a rotating mode, a second bearing plate is fixedly arranged on the inner wall of one side of the threaded block in a rotating mode, a one-way coupler is arranged in the second bearing plate in a rotating mode, the one-way coupler is close to one side of the induction shaft, a transition shaft connected with conical teeth of the induction shaft in a meshing mode is arranged on one side of the induction shaft, the transition shaft is far away from one side end of the induction shaft and close to one side end.

The feedback shaft is provided with an elastic releasing device for releasing elastic potential energy of a torsion spring between the fixed long shaft and the sponge block, the elastic releasing device comprises a half gear fixedly arranged on the feedback shaft, a stroke groove is arranged in the first bearing plate, a slide block is arranged in the stroke groove in a sliding manner, the slide block is close to a side end face of the induction plate and is fixedly provided with a curved rod, one side end of the curved rod close to the induction plate extends to one side of the first bearing plate close to the ground and is close to one side end of the fixed length device, a gear box is fixedly arranged on one side end face of the gear box close to the ground and is communicated with one side end face of the fixed length device, a gear cavity is arranged in the gear cavity and can be close to the inner wall of one side of the fixed length device and can be meshed with the inner wall of one side of the fixed length device, and a first straight, the friction wheel is close to fixedly on the first straight-tooth gear side end face be equipped with fixed length axle sliding connection's second straight-tooth gear, the tooth case is close to symmetrical and fixed two restriction boards that are equipped with on the fixed length axle side end face, the restriction board can with the corresponding position first straight-tooth gear and the meshing of second straight-tooth gear.

The penetrating port is internally provided with a wetting device which is used for locally wetting the packaging bag and is convenient to open, the wetting device comprises two sponge blocks which are respectively embedded into the inner walls at two opposite sides of the penetrating port, the working box is internally provided with a water storage cavity positioned at one side of the working cavity far away from the ground, the water storage cavity is far away from the inner wall at one side of the working cavity and the inner wall at one side of the working box far away from the ground, a screw plug is communicated and connected with the inner wall at one side of the working cavity through a thread, a driven shaft is rotatably arranged between the end surface at one side of the first bearing plate far away from the sensing plate and the inner wall at one side of the working cavity close to the water storage cavity, the driven shaft is connected with the feedback shaft belt, the working box is internally provided with a pressure cavity positioned at one side of the water storage cavity close to the, the end of the piston rod far away from the piston plate extends into the working cavity and is fixedly provided with a touch panel, a follow-up spring is fixedly arranged between the end surface of one side of the pressure cavity close to the feedback shaft and the inner wall of one side of the working cavity close to the touch panel, a cam capable of touching the touch panel is fixedly arranged on the driven shaft, a water inlet hole is arranged between the inner wall of one side of the pressure cavity far away from the driven shaft and the inner wall of one side of the water storage cavity close to the working cavity in a through way, a water outlet hole is arranged on the inner wall of one side of the pressure cavity far away from the driven shaft in a through way, the water outlet holes are divided into two in the working box, the two water outlet holes are respectively communicated with the end surface of one side of the sponge blocks far away from the through hole, two pulling grooves with openings, the pulling groove is communicated with the through hole.

The working chamber is far away from the inner wall on one side of the thread block and the working chamber is far away from the opening and closing port between the inner wall on one side of the thread block, so that the friction wheel is wound, the plastic bag is timely replaced after being used and the initial preparation of the plastic bag is carried out, the friction wheel is made of rubber, the friction force between the plastic bags is large, when the two friction wheels extrude the plastic bag mutually, the plastic bag does not generate play under the action of friction force, the spring elasticity coefficient of the induction spring is small, the pulling difficulty of the plastic bag by a user can not be caused, the induction plate just rotates a circle by the feedback shaft when being reset, namely, the gear box just completes a round trip cycle, when the user pulls out a fixed using length, the friction wheel and the torsion spring between the fixed long shafts just reach the maximum rotating angle, the user can not continue to pull the plastic bag at this moment promptly to reach the user and can only pull out at every turn the effect of a service length of plastic bag prevents when being convenient for singly take the waste of plastic bag, be equipped with the check valve of intaking in the inlet opening, be equipped with the check valve of water outlet in the apopore.

By adopting the technical scheme, the invention has the following beneficial effects:

in the middle of this scheme, the fixed length that utilizes torsional spring slewing mechanism to control the plastic bag is dragged, make the user pull at every turn and can only tear a wrapping bag, realized the control of user to dragging plastic bag quantity, effectively avoided the user mistake to get and the waste of plastic bag, utilize the state of dragging of elasticity pendulum rod mechanism response plastic bag, with this control torsional spring slewing mechanism's elastic potential energy release, make the work of taking out of plastic bag can be repeated, and utilize pulling of plastic bag to dip in wet device and will treat that the opening part of pulling out the plastic bag dips in wet, make the user can follow the plastic bag and dip in the more convenient plastic bag of opening of wet department.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic view of the construction of a single sheet take device for facilitating the opening of a plastic bag according to the present invention;

FIG. 2 is a schematic view of the structure in the direction "A-A" of FIG. 1;

FIG. 3 is a schematic view of the structure in the direction "B-B" of FIG. 1;

FIG. 4 is a schematic view of the structure in the direction "C-C" of FIG. 1;

FIG. 5 is an enlarged schematic view of a portion "D" of FIG. 1;

FIG. 6 is a schematic view of the structure in the direction "E-E" of FIG. 1.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. In which like parts are designated by like reference numerals. It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper," and "lower" refer to directions in the drawings, and the terms "bottom" and "top," "inner," and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1 to 6, sola device of taking convenient to plastic bag is opened, including work box 11, be equipped with working chamber 12 in the work box 11, be equipped with the length device 81 that drags the wrapping bag by fixed length in the working chamber 12, length device 81 is in including rotating the setting threaded rod 14 between the 12 relative both sides inner walls of working chamber, threaded connection is equipped with two screw thread pieces 45 that can conflict each other on the threaded rod 14, it is equipped with fixed long axis 37 to rotate on 45 side end of screw thread piece, it is equipped with friction pulley 38 to fix torsional spring rotation on the long axis 37, length device 81 is close to wrapping bag and draws one side and is equipped with induction system 83 who draws the state to carry out the response to the wrapping bag, induction system 83 sets up including rotating induction shaft 15 on 12 one side inner wall of working chamber, the fixed induction shaft 15 that is equipped with induction system 22, induction system 22 keeps away from length device 81 side end with working chamber 12 is close to induction shaft 15 one side An induction spring 17 is fixedly arranged between the inner walls.

Referring to the attached drawings 1 and 2, the length control device 81 further comprises a discharge shaft 40 rotatably disposed on the inner wall of one side of the working chamber 12, a bag winding wheel 41 is disposed on the discharge shaft 40 through a spline, a plastic bag 39 is wound on the bag winding wheel 41, a penetrating port 19 is formed between the inner wall of one side of the discharge shaft 40 far away from the working chamber 12 and the corresponding side end face of the working chamber 12 in a penetrating manner, the other end of the plastic bag 39 can penetrate through two friction wheels 38 and pass through the induction plate 22 and finally penetrate out of the penetrating port 19, one side end of the threaded rod 14 close to the ground extends to one side of the working chamber 11 close to the ground, an adjusting disc 13 is fixedly disposed on the side of the working chamber 12 close to the threaded block 45, a positioning groove 46 with an opening facing one side of the threaded block 45 is disposed on the inner wall of one side of the threaded block 45 close to one side of the positioning groove, the fixing pin 44 slides in the positioning slot 46; the worker can adjust the distance between the two friction wheels 38 by rotating the adjusting plate 13, so that the two friction wheels 38 firmly fix the plastic bag 39 and prevent the plastic bag 39 from moving.

Referring to fig. 1 and fig. 3, the sensing device 83 further includes a first bearing plate 23 fixedly disposed on an inner wall of the working chamber 12 close to the screw block 45, a feedback shaft 34 rotatably connected to the first bearing plate 23 is rotatably disposed on an inner wall of the working chamber 12 far from the ground, a second bearing plate 20 is fixedly disposed on an inner wall of the working chamber 12 close to the screw block 45, a one-way coupling 16 is rotatably disposed in the second bearing plate 20, a transition shaft 35 engaged with the conical teeth of the sensing shaft 15 is disposed on one side of the one-way coupling 16 close to the sensing shaft 15, and a side end of the transition shaft 35 far from the sensing shaft 15 is connected to one side end of the feedback shaft 34 close to the sensing shaft 15 through the one-way coupling 16 in a one-way transmission manner; when the user pulls plastic bag 39, plastic bag 39 is flare-outed plastic bag 39's tension effect down the tablet 22 swing, response spring 17 compresses, response axle 15 rotates and will drive transition axle 35 rotates, because one-way clutch 16 one-way transmission, so tablet 22 is to keeping away from when fixed length device 81 one side swings one-way clutch 16 does not drive feedback shaft 34 rotates, works as tablet 22 is to being close to when fixed length device 81 one side swing resets, one-way clutch 16 drives feedback shaft 34 rotates.

Referring to fig. 1, 3, 4, and 5, the feedback shaft 34 is provided with an elastic releasing device 84 for releasing elastic potential energy of the torsion spring between the fixed length shaft 37 and the sponge block 18, the elastic releasing device 84 includes a half gear 47 fixedly disposed on the feedback shaft 34, a stroke slot 50 is disposed in the first bearing plate 23, a sliding block 51 is slidably disposed in the stroke slot 50, a curved rod 52 is fixedly disposed on an end surface of the sliding block 51 near the sensing plate 22, one end of the curved rod 52 near the sensing plate 22 extends to a side of the first bearing plate 23 near the ground and is fixedly disposed at one end of the fixed length device 81, the gear box 36 is disposed near a side end surface of the ground and is communicated with a side end surface of the ground to form a gear cavity 48, the half gear 47 is disposed in the gear cavity 48 and can be engaged with an inner wall of the fixed length device 81 and an inner wall of the fixed length device 81, a first straight gear 43 is fixedly arranged on the fixed long shaft 37, a second straight gear 42 which is in sliding connection with the fixed long shaft 37 is fixedly arranged on the end surface of the friction wheel 38 close to one side of the first straight gear 43, two limiting plates 49 are symmetrically and fixedly arranged on the end surface of the gear box 36 close to one side of the fixed long shaft 37, and the limiting plates 49 can be meshed with the first straight gear 43 and the second straight gear 42 at corresponding positions; when the half gear 47 rotates, the gear box 36 is driven to reciprocate, so that the limiting plate 49 reciprocates to firstly release the meshing state of the limiting plate 49 and the first spur gear 43 and further mesh with the second spur gear 42, and finally reset, in the process, the rotation limitation of the first spur gear 43 is firstly released, the second spur gear 42 is limited by the limiting plate 49 to rotate, and finally, the first spur gear 43 is limited by rotation again along with the resetting of the limiting plate 49, and the rotation limitation of the second spur gear 42 is released.

Referring to the attached drawings 1 and 6, a wetting device 82 for locally wetting the packaging bag to be opened conveniently is arranged in the through hole 19, the wetting device 82 comprises two sponge blocks 18 respectively embedded in inner walls of two opposite sides of the through hole 19, a water storage cavity 26 located on one side, away from the ground, of the working cavity 12 is arranged in the working box 11, the water storage cavity 26 is far away from the inner wall of one side of the working cavity 12 and the inner wall of one side, away from the ground, of the working box 11, and is provided with a screw plug 30 in a through and threaded connection mode, a driven shaft 32 is rotatably arranged between the end surface of one side, away from the sensing plate 22, of the first shaft bearing plate 23 and the inner wall, close to one side of the water storage cavity 26, of the working cavity 12 in a rotating mode, the driven shaft 32 is in a belt connection with the feedback shaft 34, a pressure cavity 25 located on one side, close to the working cavity 12, a piston rod 28 is fixedly arranged on the end face of one side of the piston plate 27 close to the driven shaft 32, one side end of the piston rod 28 far away from the piston plate 27 extends into the working chamber 12 and is fixedly provided with a touch panel 31, a feedback shaft 34 is close to one side end face of the pressure chamber 25 and is fixedly provided with a follow-up spring 29 between the inner wall of one side of the working chamber 12 close to the touch panel 31, a cam 33 capable of abutting against the touch panel 31 is fixedly arranged on the driven shaft 32, a water inlet hole 24 is arranged between the inner wall of one side of the pressure chamber 25 far away from the driven shaft 32 and the inner wall of one side of the water storage chamber 26 close to the working chamber 12 in a through manner, a water outlet hole 21 is arranged on the inner wall of one side of the pressure chamber 25 far away from the driven shaft 32 in a through manner, the water outlet holes 21 are divided into two in the, two pulling grooves 53 with openings facing to the side far away from the length fixing device 81 are symmetrically arranged on the end surface of the working box 11 far away from the length fixing device 81 and relative to the sponge block 18, and the pulling grooves 53 are communicated with the through hole 19; when the driven shaft 32 drives cam 33 rotates, cam 33 is through contradicting it drives to touch panel 31 piston plate 27 is in reciprocating motion in the pressure chamber 25, thereby utilize pressure will water logging in the water storage chamber 26 arrives in the sponge piece 18, sponge piece 18 will pull extremely wear to see through wrapping bag opening part in the mouth 19 and dip in wet, pass through as the user pull groove 53 and pull when wearing the plastic bag in the mouth 19, the wrapping bag of pulling out is being dipped in wet department and is opened more easily.

Referring to fig. 1, 2 and 3, the inner wall of the working chamber 12 on one side far from the screw block 45 and the inner wall of the working chamber 12 on one side far from the screw block 45 are provided with an opening and closing port 55, so that the plastic bag 39 wound on the friction wheel 38 is timely replaced after being used and the plastic bag 39 is initially prepared, the friction wheel 38 is made of rubber, the friction force between the friction wheel 38 and the plastic bag 39 is large, when the two friction wheels 38 press the plastic bag 39 against each other, the plastic bag 39 does not move under the action of friction force, the spring force coefficient of the induction spring 17 is small, the difficulty of pulling the plastic bag 39 by a user is not caused, when the induction plate 22 is reset, the feedback shaft 34 just rotates for one circle, that is, the gear box 36 just completes one round trip cycle, when the user pulls out a fixed use length, the torsional spring between the friction wheel 38 and the fixed long shaft 37 just reaches the maximum rotation angle, that is, the user cannot pull the plastic bag 39 any more at the moment, so that the effect that the user can only pull one using length of the plastic bag 39 each time is achieved, the plastic bag 39 is convenient to take one by one and is prevented from being wasted, a water inlet check valve is arranged in the water inlet hole 24, and a water outlet check valve is arranged in the water outlet hole 21; after the plastic bag 39 on the bag winding wheel 41 is used, the bag winding wheel 41 is replaced through the opening and closing opening 55, the adjusting disc 13 is rotated to drive the two friction wheels 38 to move in opposite directions, the initial end of the plastic bag 39 passes through the space between the two friction wheels 38 and passes through the induction plate 22, finally the initial end of the plastic bag 39 passes through the outlet 19, and the adjusting disc 13 is rotated to enable the two friction wheels 38 to press the plastic bag 39, so that the preparation work of the initial state of the plastic bag 39 can be completed.

The working principle is as follows:

initially, the plastic bag 39 passes through between the two friction wheels 38, the pulling end of the plastic bag 39 is flush with the end face of one side of the working box 11, which is far away from the length control device 81, the sensing plate 22 is not stressed by the tension of the plastic bag 39, the sensing spring 17 is not compressed, the torsion spring between the friction wheel 38 and the length control shaft 37 does not accumulate elastic potential energy, the half gear 47 is positioned in the tooth cavity 48 and far away from one side of the fixing pin 44, the limiting plate 49 is meshed with the first straight gear 43, the second straight gear 42 is not meshed with the limiting plate 49, namely, the rotation of the first straight gear 43 and the length control shaft 37 is limited, the rotation of the friction wheels 38 is not limited, the end face of one side of the piston plate 27, which is close to the driven shaft 32, is abutted against the inner wall of one side of the pressure cavity 25;

when the plastic bag pulling device works, a user pulls the plastic bag 39 through the pulling groove 53, the plastic bag 39 is pulled tightly to drive the induction plate 22 and the induction shaft 15 to rotate, the feedback shaft 34 does not rotate under the unidirectional transmission action of the unidirectional coupler 16, the induction spring 17 is compressed, when the induction plate 22 rotates to the limit position, the plastic bag 39 is pulled to drive the two friction wheels 38 to rotate around the fixed long shaft 37, the torsion spring between the friction wheel 38 and the fixed length shaft 37 accumulates elastic potential energy, the bag winding wheel 41 and the discharging shaft 40 rotate to discharge the plastic bag 39, when the user pulls out a used length, the torsion spring between the fixed long shaft 37 and the friction wheel 38 reaches the maximum rotation angle, namely the friction wheel 38 cannot rotate, after the user pulls out the plastic bag 39 with the used length, the tension borne by the induction plate 22 disappears, the induction spring 17 releases the elastic potential energy before the torsion spring between the fixed long shaft 37 and the friction wheel 38, and the induction plate 22 is in the elastic resetting process of, the sensing shaft 15 drives the feedback shaft 34 to rotate through the one-way coupling 16, the feedback shaft 34 rotates the half gear 47, the half gear 47 rotates to drive the gear box 36 and the limiting plate 49 to move to the side far away from the fixed pin 44, the limiting plate 49 is immediately meshed with the second spur gear 42, namely as long as the sensing plate 22 is reset, the limiting plate 49 can be immediately meshed with the second spur gear 42 to prevent the release of the torsional spring potential energy between the friction wheel 38 and the fixed length shaft 37, along with the reset of the sensing plate 22, the sensing shaft 15 rotates to just drive the gear box 36 and the limiting plate 49 to complete a reciprocating cycle, the limiting plate 49 is gradually disengaged from the first spur gear 43 after being meshed with the second spur gear 42, at the moment, the friction wheel 38 is limited by the rotation of the limiting plate 49, the rotation limitation of the first spur gear 43 and the fixed length shaft 37 is released, so that the fixed length shaft 37 rotates under the action of the elasticity of the torsional spring between the friction wheel 38 and the fixed length shaft 37 to release the torsional, when the first straight gear 43 and the limiting plate 49 are reset, the limiting plate 49 is disengaged from the second straight gear 42 again and is engaged with the first straight gear 43, at this time, the rotation limitation of the friction wheel 38 is removed, the first straight gear 43 and the fixed long shaft 37 are limited by the rotation of the limiting plate 49 again, because the elastic potential energy of the torsion spring between the fixed long shaft 37 and the friction wheel 38 is removed, the plastic bag 39 cannot retract, the driven shaft 32 and the cam 33 connected with the belt are driven to rotate for a circle by the feedback shaft 34 in the process of rotating for a circle, the cam 33 pushes against the contact plate 31 to complete a reciprocating cycle, along with the reciprocating motion of the piston plate 27 in the pressure chamber 25, the water in the water storage chamber 26 infiltrates the sponge block 18 through the water inlet hole 24, the pressure chamber 25 and the sponge 21, the water outlet hole block 18 infiltrates the moisture in the sponge 19, and a user can easily open the wetted part of the plastic bag 39 after pulling out the wetted part, after the induction plate 22 is reset, all parts of the device return to the initial state to wait for the next use of pulling the plastic bag 39 by the user;

when the plastic bag 39 on the bag winding wheel 41 is used, the bag winding wheel 41 is replaced after being opened and closed, the adjusting disc 13 is rotated to drive the two friction wheels 38 to move oppositely, the initial end of the plastic bag 39 passes through the space between the two friction wheels 38 and passes through the induction plate 22, finally the initial end of the plastic bag 39 passes through the through outlet 19, the adjusting disc 13 is rotated to enable the two friction wheels 38 to press the plastic bag 39, and the preparation work of the initial state of the plastic bag 39 can be completed.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.