CN215358639U - Protection film divides strip machine - Google Patents
Protection film divides strip machine Download PDFInfo
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- CN215358639U CN215358639U CN202120658287.2U CN202120658287U CN215358639U CN 215358639 U CN215358639 U CN 215358639U CN 202120658287 U CN202120658287 U CN 202120658287U CN 215358639 U CN215358639 U CN 215358639U
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- protective film
- slitting
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Abstract
The utility model relates to the field of protective film slitting equipment, and particularly discloses a protective film slitting machine which is characterized by comprising the following components in parts by weight: a parent roll take-up and pay-off device; a slitting and returning device; tensioning and adjusting the rolling device; rolling a conveying device; a transverse slitting device; a longitudinal slitting device; according to the utility model, through the cutting backspacing device, when the cutting size of the large-size protective film deviates from the pre-selected cutting line of the protective film due to the accumulated error in the cutting process, the backspacing and fine tuning of the position of the protective film to be adjusted and cut are performed by the combined action of the PLC control and the tensioning rotary driving motor and the servo driving motor. Even if the deviation distance is not large, the whole large protective film which is cut and deviated does not need to be pulled out by hands, and only a small section which is staggered and deviated is cut, so that the whole waste is greatly avoided.
Description
Technical Field
The utility model relates to the field of protective film slitting equipment, in particular to a protective film slitting machine.
Background
The types and application scenes of the protective films (PVC films) are wide, and in the actual use process, the processes of slitting, subsequent packaging and the like are required according to the actual size specification.
The existing slitting machine always needs to cut a protective film mother roll with a large size, fine adjustment operation cannot be well achieved due to the fact that a structural defect mother roll winding and unwinding device cannot achieve fine adjustment operation, when a large-size protective film is cut due to accumulated errors in the cutting process, the cut size deviates from a cutting line defined by protective film preselection, even if the deviation distance is not large, the large protective film which is cut and deviated needs to be pulled out, the protective film is treated as a scrapped material, and if the large protective film is cut, the waste phenomenon of raw materials of the protective film can become serious.
After the protective film mother roll is arranged on the mother roll winding and unwinding device, in order to ensure the conveying precision, the protective film mother roll preferably cannot be loosened and shaken obviously, and the conventional protective film mother roll has certain flexibility, so that the unfavorable conditions of loosening and shaking and the like are easy to occur during conveying.
The horizontal and fore-and-aft structure that cuts of equipment is divided to current protection film, only adopt circular shape blade holder, this structure is adjusted comparatively inconveniently, and lack convenient regulation reference structure, and circular shape blade holder is behind long-time continuity of operation, because the blade dulls slightly, to the smooth protection film (PVC film) in surface hydroplaning or the incomplete scheduling problem of cutting appear more easily, there is certain adverse effect to the processing work of cutting of protection film, consequently, great improvement space has.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the background art, the utility model aims to provide a protective film slitting machine.
In order to achieve the purpose, the utility model provides the following technical scheme:
a protective film slitting machine, the main part includes:
the protective film coiling and uncoiling device comprises a primary coil coiling and uncoiling device, wherein the primary coil coiling and uncoiling device comprises a primary coil coiling and uncoiling shaft for arranging a protective film coiling barrel, an elastic jacking part which can extend out of a shaft body of the primary coil coiling and uncoiling shaft is arranged in the primary coil coiling and uncoiling shaft, and the elastic jacking part can be in close contact with and jacked on the surface of the inner wall of the protective film coiling barrel;
the cutting and backspacing device comprises a driving part which is connected with the primary coil winding and unwinding shaft through a belt pulley, a chain wheel or a gear and is used for driving the primary coil winding and unwinding shaft to rotate clockwise or anticlockwise;
the tensioning adjusting rolling device comprises a plurality of tensioning fixed pressing rollers arranged above the mother roll collecting and releasing device in the horizontal direction and a tensioning adjusting pressing roller arranged on one side of the tensioning fixed pressing rollers and connected with an adjusting handle;
the device comprises a tensioning adjusting rolling device, a rolling conveying device and a control device, wherein the tensioning adjusting rolling device is arranged on the tensioning adjusting rolling device and comprises a plurality of rolling wheel sets which are arranged on one side of the tensioning adjusting rolling device in an up-down opposite clamping mode, and a telescopic gluing jacking block is arranged below each rolling wheel set;
the transverse slitting device comprises a telescopic press roller and a plurality of slitting cutter seats which are correspondingly arranged below the telescopic press roller and used for transversely slitting the protective film extruded and conveyed by the roller set;
the device is vertically cut, vertically cut the device including setting up the terminal slip of roll-in wheelset pay-off direction is cut seat and drive the seat drive block is cut in the slip that the seat walked around is cut in the slip, slide to cut and be equipped with the rip cutting blade on the seat, through the seat is cut in the slip, be used for to the warp the protection film that roll-in wheelset extrusion was carried carries out vertically to cut.
Preferably, the winding device comprises a plurality of winding roller shafts arranged at the tail end of the feeding direction of the longitudinal cutting device, and the winding roller shafts are used for winding the protective film which is cut by the transverse cutting device and the longitudinal cutting device.
Preferably, the elastic jacking part comprises a support frame embedded in an inner cavity of the primary winding and unwinding shaft, a mounting groove is formed in the support frame, an elastic part is arranged in the mounting groove, jacking blocks are arranged at two ends of the elastic part, and the end parts of the jacking blocks extend out of the shaft body of the primary winding and unwinding shaft.
Preferably, the top pressing block is in a long strip shape as a whole, the upper end of the top pressing block is inverted with an arc angle, and the two sides of the upper end are provided with a step in a gentle slope shape.
Preferably, the driving unit is a servo drive motor.
Preferably, a tension rotation driving motor for providing a driving rotation force is connected to the tension fixing pressure roller.
Preferably, the telescopic gluing jacking block comprises a gluing swinging plate which can be in mutual contact with the bottom surface of the protective film, one end of the gluing swinging plate is connected through a rotating shaft to form a fulcrum of the gluing swinging plate which swings up and down, and the other end of the gluing swinging plate is connected with a gluing plate pushing cylinder which drives the gluing swinging plate to swing up and down.
Preferably, the slitting knife seat comprises a sliding guide groove with scale marks on the surface, the sliding guide groove is connected with a connecting plate in a sliding mode, a slitting knife seat motor is arranged at the end of the connecting plate, and a disc transverse cutting blade is connected with the slitting knife seat motor.
Preferably, the end of the connecting plate is provided with a cutter mounting seat, and the cutter mounting seat is connected with a transverse cutting blade.
Preferably, the cross cutting blade and the longitudinal cutting blade are two square blades which are obliquely and symmetrically arranged, the cutting edges of the cross cutting blade and the longitudinal cutting blade face outwards, and the knife tip is upright upwards.
Compared with the prior art, the utility model has the beneficial effects that:
through the cutting backspacing device, when the cutting size of the large-size protective film deviates from a cutting line defined by the protective film preselection due to accumulated errors in the cutting process, the backspacing and fine tuning of the position, required to be adjusted and cut, of the protective film are supplemented through the combined action of the PLC control and the tensioning rotary driving motor and the servo driving motor. Even if the deviation distance is not large, the whole large protective film which is cut and deviated does not need to be pulled out by hands, and only a small section which is staggered and deviated is cut, so that the whole waste is greatly avoided.
Through the elastic jacking part of the primary coil winding and unwinding device, the problem that the protective film primary coil with certain flexibility is loosened and rocked can be effectively solved, and the conveying precision can be guaranteed. Owing to set up the roof pressure piece wholly into rectangular, not only strengthen the contact and push up tight effect, the roof pressure piece is through setting up the upper and lower both ends at the elastic component respectively moreover, consequently can realize two-way compressing tightly each other, with the help of the step setting of gentle sloping form, can realize efficient installation and dismantlement under the prerequisite that does not hinder the female book of protection film and settle. The upper end of the top pressing block can avoid the influence on the surface of the inner wall of the protective film winding barrel through the arrangement of the arc angle. The overall structure of the mother roll winding and unwinding device is simple and reliable, the use is convenient, and the effect of overcoming the problem that the mother roll of the protective film is loosened and shaken is obvious.
Transversely cut a plurality of branch cutter saddles of device, the slip guide slot that is equipped with the scale sign through the surface can fix a position required crosscut by the efficient very much, cuts the aspect of the structure and is connected with disc crosscut blade through dividing cutter saddle motor, cuts the protection film through fast-speed normal running fit disc crosscut blade, even disc crosscut blade's blade dulling also can carry out certain compensation through high-speed rotation.
The sliding slitting seat of the longitudinal slitting device drives the slitting blade to move efficiently and quickly under the driving of the slitting seat driving block, so that the protective film after transverse cutting is longitudinally cut, and the forming slitting work of the protective film is finished.
Through the structure setting of the vertical cutting of crosscut blade and slitting blade, under the prerequisite that does not have rotary drive, also can very sharp cut the protection film, even the blade dulls slightly, to the glossy protection film in surface (PVC film) also difficult the appearance slip or cut thoroughly scheduling problem.
Drawings
FIG. 1 is a schematic structural view in the front view direction of the present invention;
FIG. 2 is a schematic side view of the present invention;
FIG. 3 is a first schematic view of the shaft portion of the parent roll of the present invention;
FIG. 4 is a second schematic view of the shaft portion of the parent roll of the present invention;
FIG. 5 is a schematic view of the structure of the elastic pressing part of the present invention;
FIG. 6 is a schematic view showing the structure of the telescopic press roll part of the present invention;
FIG. 7 is a schematic view of the construction of a parting blade holder portion of the present invention;
FIG. 8 is a schematic view of a configuration of another embodiment of the seat portion of the slitting knife of the present invention;
FIG. 9 is a schematic view of the structure of the telescopic glue-coated top block part of the present invention;
FIG. 10 is a front view of the sliding slitting base of the utility model;
figure 11 is a side view in schematic form of the sliding slitting seat part according to the utility model;
FIG. 12 is a schematic view of the protective film cutting process of the present invention;
FIG. 13 is a first schematic diagram showing a state in which the dicing dimension of the protective film deviates from the dimension of the dicing line according to the present invention;
FIG. 14 is a second schematic view showing the state of the dicing line deviating from the dicing line in the dicing dimension of the protective film according to the present invention.
In the figure: 1. the device comprises a primary coil winding and unwinding device 2, a primary coil winding and unwinding shaft 3, an elastic jacking piece 4, a slitting and rewinding device 5, a driving part 6, a tensioning and adjusting rolling device 7, a tensioning and fixing pressing roller 8, a tensioning and adjusting pressing roller 9, a rolling and conveying device 10, a rolling roller wheel group 11, a telescopic gluing jacking block 12, a transverse slitting device 13, a telescopic pressing roller 14, a slitting cutter seat 15, a longitudinal slitting device 16, a sliding slitting seat 17, a slitting seat driving block 18, a longitudinal cutting blade 19, a winding roller shaft device 20, a winding roller shaft 21, a protective film winding cylinder 22, a supporting frame 23, a mounting groove 24, an elastic piece 25, a jacking block 26, a tensioning and rotating driving motor 27, a gluing swinging plate 28, a gluing plate pushing cylinder 29, a scale mark 30, a sliding guide groove 31, a connecting plate 32, a slitting cutter seat motor 33, a disc transverse cutting blade 34, a transverse cutting blade 35, a protective film 36 and a cutter mounting seat.
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. 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.
As shown in fig. 1 to 14, a protective film slitting machine includes:
the primary winding and unwinding device 1 comprises a primary winding and unwinding shaft 2 for arranging a protective film winding barrel 21, an elastic jacking part 3 capable of extending out of the shaft body of the primary winding and unwinding shaft 2 is arranged in the primary winding and unwinding shaft 2, and the elastic jacking part 3 can be in close contact with and jack the inner wall surface of the protective film winding barrel 21.
The cutting and returning device 4 comprises a driving part 5 which is connected with the primary coil winding and unwinding shaft 2 through a belt pulley, a chain wheel or a gear and is used for driving the primary coil winding and unwinding shaft 2 to rotate clockwise or anticlockwise;
the tensioning adjusting rolling device 6 comprises a plurality of tensioning fixed pressing rollers 7 arranged above the mother roll winding and unwinding device 1 in the horizontal direction and a tensioning adjusting pressing roller 8 arranged on one side of the tensioning fixed pressing roller 7 and connected with an adjusting handle;
the device comprises a rolling conveying device 9, wherein the rolling conveying device 9 comprises a plurality of rolling wheel sets 10 which are oppositely arranged at one side of the tensioning and adjusting rolling device 6 in the feeding direction, and a telescopic gluing jacking block 11 is arranged below each rolling wheel set 10;
the transverse cutting device 12 comprises a telescopic press roller 13 and a plurality of cutting knife seats 14 which are correspondingly arranged below the telescopic press roller 13 and used for transversely cutting the protective film 35 extruded and conveyed by the press roller group 10;
the longitudinal cutting device 15 comprises a sliding cutting seat 16 arranged at the tail end of the feeding direction of the rolling wheel set 10 and a cutting seat driving block 17 driving the sliding cutting seat 16 to walk back and forth, wherein a longitudinal cutting blade 18 is arranged on the sliding cutting seat 16, and the sliding cutting seat 16 is used for longitudinally cutting the protective film 35 extruded and conveyed by the rolling wheel set 10. The slitting seat driving block 17 is a cylinder or a hydraulic cylinder.
As an example, the driving part 5 is a servo driving motor. The torque can be accurately controlled through the servo driving motor, and the position of the back-off slitting can be conveniently finely adjusted. The tension fixing pressure roller 7 is connected with a tension rotation driving motor 26 that provides a driving rotational force.
Through the cutting retraction device 4, when the large-size protective film 35 deviates from the pre-selected cutting line of the protective film 35 due to the accumulated error in the cutting process, that is, the retraction fine adjustment is performed on the position of the protective film 35 to be adjusted and cut by the servo drive motor of the driving part 5 under the combined action of the PLC control and the tensioning rotary drive motor 26. Even if the deviation distance is not large, the whole large protective film 35 which is cut and deviated does not need to be pulled out by hands, and only a small section which is staggered and deviated is required to be cut, so that the whole waste is greatly avoided.
As an embodiment, the film winding device further comprises a winding roller shaft device 19, wherein the winding roller shaft device 19 comprises a plurality of winding roller shafts 20 arranged at the tail ends of the feeding direction of the longitudinal cutting device, and the winding roller shafts 20 are used for winding the protective film 35 which is cut by the transverse cutting device 12 and the longitudinal cutting device 15. The take-up roller shaft 20 obtains a driving force by being connected to a driving motor.
Elastic top pressure piece 3 is including inlaying support frame 22 in the 2 inner chambers of female book receipts axle, and support frame 22 is inside to be equipped with mounting groove 23, is equipped with elastic component 24 in the mounting groove 23, and elastic component 24's both ends all are equipped with top briquetting 25, and top briquetting 25's tip stretches out in the axle body of female book receipts axle 2. The elastic member 24 is a spring or a compression spring.
The top pressing block 25 is integrally in a long strip shape, an arc angle is inverted at the upper end of the top pressing block 25, and steps in a gentle slope shape are arranged on two sides of the upper end.
Through the elastic jacking part 3 of the primary coil winding and unwinding device 1, the problem that the primary coil of the protective film 35 with certain flexibility is loosened and rocked can be effectively solved, and the conveying precision can be guaranteed. Owing to set up top briquetting 25 wholly into rectangular shape, not only strengthen the contact and push up tight effect, top briquetting 25 is through setting up respectively at the upper and lower both ends of elastic component 24 moreover, consequently can realize two-way compressing tightly each other, with the help of the step setting of gentle sloping form, can realize efficient installation and dismantlement under the prerequisite that does not hinder the female book of protection film 35 and settle. The upper end of the top pressing block 25 can avoid the influence on the inner wall surface of the protective film winding barrel 21 by the arrangement of the arc angle. The overall structure of the mother roll winding and unwinding device 1 is simple and reliable, the use is convenient, and the effect of overcoming the problem that the mother roll of the protective film 35 is loosened and shaken is obvious.
The telescopic gluing top block 11 comprises a gluing swing plate 27 capable of being in contact with the bottom surface of the protective film 35, one end of the gluing swing plate 27 is connected through a rotating shaft to form a fulcrum of the gluing swing plate 27 swinging up and down, and the other end of the gluing swing plate 27 is connected with a gluing plate pushing cylinder 28 driving the gluing swing plate to swing up and down back and forth.
The telescopic gluing jacking block 11 is very simple in overall structure through the arrangement of the gluing swing plate 27, the main action can be completed by pushing the air cylinder 28 through the gluing plate, and the lower surface of the protective film 35 can be glued conveniently and quickly in a back-and-forth swing mode.
The slitting knife seat 14 comprises a sliding guide groove 30 with scale marks 29 on the surface, the sliding guide groove 30 is connected with a connecting plate 31 in a sliding mode, a slitting knife seat motor 32 is arranged at the end portion of the connecting plate 31, and the slitting knife seat motor 32 is connected with a disc transverse cutting blade 33.
In one embodiment, the end of the connecting plate 31 is provided with a cutter mounting seat 36, and the cutter mounting seat 36 is connected with a transverse cutting blade 34.
A plurality of branch cutter saddles 14 of the transverse cutting device 12 are provided with the sliding guide groove 30 of the scale mark 29 on the surface, and can be positioned at the required transverse cutting position with high efficiency, and the cutting structure is connected with a disc transverse cutting blade 33 through a branch cutter saddle motor 32, and the protective film 35 is cut through the high-speed rotation fit disc transverse cutting blade 33, even if the cutting edge of the disc transverse cutting blade 33 becomes blunt, certain compensation can be performed through high-speed rotation.
The sliding slitting seat 16 of the longitudinal slitting device 15 drives the slitting blade 18 to move efficiently and quickly under the driving of the slitting seat driving block 17 (air cylinder or hydraulic cylinder), so that the protective film 35 after transverse cutting is longitudinally cut again, and the forming slitting work of the protective film 35 is completed.
As an example, the cross cutting blade 34 and the slitting blade 18 are two square blades which are obliquely and symmetrically arranged, the cutting edges of the cross cutting blade 35 and the slitting blade 18 face outwards, and the knife points are upright.
Through the structure setting of the vertical cutting of crosscut blade 35 and longitudinal knife piece 18, under the prerequisite that does not have rotary drive, also can very sharp cut protection film 35, even the blade dulls slightly, also difficult emergence is slipped or the cutting scheduling problem thoroughly to the smooth protection film (PVC film) in surface.
The basic working principle of the utility model is as follows:
the protective film coiling barrel 21 is tightly fixed through the elastic jacking part 3 of the primary coil coiling and uncoiling device 1, the protective film 35 on the protective film coiling barrel 21 is conveyed towards the rolling conveying device 9 and the coiling roller shaft device 19 through the tensioning adjusting rolling device 6, the cutting of the large-size protective film 35 is completed under the action of the transverse cutting device 12 and the longitudinal cutting device 15, and finally the coiling work is completed through the coiling roller shaft device 19.
Those not described in detail in this specification are within the skill of the art. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents and modifications of some features of the utility model can be made without departing from the spirit and scope of the utility model.
Claims (10)
1. The utility model provides a protection film divides strip machine which characterized in that includes:
the protective film coiling and uncoiling device comprises a primary coil coiling and uncoiling device, wherein the primary coil coiling and uncoiling device comprises a primary coil coiling and uncoiling shaft for arranging a protective film coiling barrel, an elastic jacking part which can extend out of a shaft body of the primary coil coiling and uncoiling shaft is arranged in the primary coil coiling and uncoiling shaft, and the elastic jacking part can be in close contact with and jacked on the surface of the inner wall of the protective film coiling barrel;
the cutting and backspacing device comprises a driving part which is connected with the primary coil winding and unwinding shaft through a belt pulley, a chain wheel or a gear and is used for driving the primary coil winding and unwinding shaft to rotate clockwise or anticlockwise;
the tensioning adjusting rolling device comprises a plurality of tensioning fixed pressing rollers arranged above the mother roll collecting and releasing device in the horizontal direction and a tensioning adjusting pressing roller arranged on one side of the tensioning fixed pressing rollers and connected with an adjusting handle;
the device comprises a tensioning adjusting rolling device, a rolling conveying device and a control device, wherein the tensioning adjusting rolling device is arranged on the tensioning adjusting rolling device and comprises a plurality of rolling wheel sets which are arranged on one side of the tensioning adjusting rolling device in an up-down opposite clamping mode, and a telescopic gluing jacking block is arranged below each rolling wheel set;
the transverse slitting device comprises a telescopic press roller and a plurality of slitting cutter seats which are correspondingly arranged below the telescopic press roller and used for transversely slitting the protective film extruded and conveyed by the roller set;
the device is vertically cut, vertically cut the device including setting up the terminal slip of roll-in wheelset pay-off direction is cut seat and drive the seat drive block is cut in the slip that the seat walked around is cut in the slip, slide to cut and be equipped with the rip cutting blade on the seat, through the seat is cut in the slip, be used for to the warp the protection film that roll-in wheelset extrusion was carried carries out vertically to cut.
2. A protective film slitting machine according to claim 1, characterized in that: still include wind-up roll axle device, wind-up roll axle device includes that a plurality of settings are at the terminal rolling roller axle of vertical cutting device feeding direction, through the rolling roller axle is used for carrying out the rolling through the protection film after horizontal cutting device and vertical cutting device cut.
3. A protective film slitting machine according to claim 1, characterized in that: the elastic jacking part comprises a supporting frame embedded in an inner cavity of the primary winding shaft, a mounting groove is formed in the supporting frame, an elastic part is arranged in the mounting groove, jacking blocks are arranged at two ends of the elastic part, and the end parts of the jacking blocks extend out of a shaft body of the primary winding shaft.
4. A protective film slitting machine according to claim 3, characterized in that: the whole top pressing block is in a long strip shape, an arc angle is formed at the upper end of the top pressing block in an inverted mode, and steps in a slope-relieving shape are arranged on two sides of the upper end.
5. A protective film slitting machine according to claim 1, characterized in that: the driving part is a servo driving motor.
6. A protective film slitting machine according to claim 1, characterized in that: the tensioning fixed compression roller is connected with a tensioning rotary driving motor for providing driving rotating force.
7. A protective film slitting machine according to claim 5 or 6, characterized in that: the flexible rubber coating kicking block including can with the rubber coating swing board of protection film bottom surface mutual contact, rubber coating swing board one end is connected through the pivot to constitute the fulcrum of rubber coating swing board luffing motion, the other end of rubber coating swing board is connected with the rubber coating board promotion cylinder of back and forth swing about the drive.
8. The protective film slitting machine according to claim 7, wherein: the slitting knife seat comprises a sliding guide groove with scale marks on the surface, the sliding guide groove is connected with a connecting plate in a sliding mode, a slitting knife seat motor is arranged at the end of the connecting plate, and a disc transverse cutting blade is connected with the slitting knife seat motor.
9. The protective film slitting machine according to claim 8, wherein: the end of the connecting plate is provided with a cutter mounting seat, and the cutter mounting seat is connected with a transverse cutting blade.
10. The protective film slitting machine according to claim 9, wherein: the transverse cutting blade and the longitudinal cutting blade are two square blades which are obliquely and symmetrically arranged, the cutting edges of the transverse cutting blade and the longitudinal cutting blade face outwards, and the tool tips are upright upwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120658287.2U CN215358639U (en) | 2021-03-31 | 2021-03-31 | Protection film divides strip machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120658287.2U CN215358639U (en) | 2021-03-31 | 2021-03-31 | Protection film divides strip machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215358639U true CN215358639U (en) | 2021-12-31 |
Family
ID=79625709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120658287.2U Active CN215358639U (en) | 2021-03-31 | 2021-03-31 | Protection film divides strip machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215358639U (en) |
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2021
- 2021-03-31 CN CN202120658287.2U patent/CN215358639U/en active Active
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