CN112938554A - Paper separating device - Google Patents
Paper separating device Download PDFInfo
- Publication number
- CN112938554A CN112938554A CN202110112413.9A CN202110112413A CN112938554A CN 112938554 A CN112938554 A CN 112938554A CN 202110112413 A CN202110112413 A CN 202110112413A CN 112938554 A CN112938554 A CN 112938554A
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- Prior art keywords
- paper
- air
- outlet pipe
- air outlet
- pipe
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/08—Separating articles from piles using pneumatic force
- B65H3/0808—Suction grippers
- B65H3/0816—Suction grippers separating from the top of pile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
- B65H3/48—Air blast acting on edges of, or under, articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H5/00—Feeding articles separated from piles; Feeding articles to machines
- B65H5/04—Feeding articles separated from piles; Feeding articles to machines by movable tables or carriages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/19—Specific article or web
- B65H2701/1924—Napkins or tissues, e.g. dressings, toweling, serviettes, kitchen paper and compresses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
The utility model relates to a branch paper equipment technical field specifically discloses paper separator, which comprises a frame and a controller, still including inhaling the paper device, the air jet system, air pump and the transmission that is equipped with follower and driving part, be equipped with in the frame and put the cardboard, the air jet system includes shower nozzle and outlet duct, outlet duct one end and air pump are connected, be equipped with the slider in the outlet duct, outlet duct bottom inner wall is equipped with the starting switch who is connected with the controller electricity, the slider is through first spring coupling at the outlet duct inner wall, slider one end is connected with the connecting rod, connecting rod one end extends the outlet duct and is connected with transmission driving part. The purpose of this patent is to solve the easy paper of branch paper mechanism and resend, cause the problem of card paper.
Description
Technical Field
The invention relates to the technical field of paper separating equipment, in particular to a paper separating device.
Background
In the present society, the frequency of paper use is extremely high, and the paper pile usually need be separated into the single-sheet paper in the paper use, and the branch paper equipment in prior art generally is the formula of rubbing paper branch paper mechanism, and the formula of rubbing paper branch paper mechanism generally includes pickup roller, dancer roll, and the formula of rubbing paper branch paper mechanism is along with the wearing and tearing of running roller, and pressure state can change to some extent, leads to the running roller local wear to so that the paper resends, and the maintenance cycle shortens, and if dancer roll pressure is too big also very easily send into many papers and get into the paper feeding part simultaneously, thereby causes the card paper trouble.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a paper separating device, and solve the problem that the existing paper separating mechanism is easy to re-feed paper and cause paper jam.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a paper separating device comprises a rack and a controller, and further comprises a paper suction device, an air injection device, an air pump and a transmission device provided with a driven part and a driving part, wherein a paper placing plate is arranged on the rack, the air injection device comprises a spray head and an air outlet pipe, one end of the air outlet pipe is connected with the air pump, a sliding block is arranged in the air outlet pipe, a starting switch electrically connected with the controller is arranged on the inner wall of the bottom of the air outlet pipe, the sliding block is connected to the inner wall of the air outlet pipe through a first spring, one end of the sliding block is connected with a connecting; the paper suction device comprises an outer cylinder connected with the frame and an inner cylinder connected with the outer cylinder in a sliding way, the lower end of the inner cylinder is provided with a paper suction head, and the inner cylinder is connected with a driven part of the transmission device; the side wall of the outer cylinder is communicated with the air outlet pipe through an air suction pipe, and a one-way valve is arranged in the air suction pipe; the side wall of the outer cylinder, which is far away from the air suction pipe, is provided with an air inlet pipe, and the air inlet pipe is provided with a time delay device; a paper transmission mechanism is arranged above the paper placing plate, a driving rod is arranged in the paper transmission mechanism, and one end of the driving rod is connected with a telescopic plate.
The technical principle of the technical scheme is as follows: the air pump works intermittently, the air pump sprays air through the air outlet pipe and the spray nozzle to blow and disperse paper, when the air flow passes through the air outlet pipe, the slide block is pushed to move towards the spray nozzle, the connecting rod arranged on the slide block also moves towards the spray nozzle, so that the transmission device is driven to work through the connecting rod, and the inner cylinder is driven to move downwards to the lower part of the expansion plate through the driven part of the transmission device; meanwhile, when the airflow flows through the joint of the air suction pipe and the air outlet pipe, negative pressure is generated due to the fact that the airflow speed is high and the air pressure is reduced, so that air in the air suction pipe flows into the air outlet pipe through the one-way valve, negative pressure is formed in a cavity among the outer cylinder, the inner cylinder and the air suction pipe, external air is sucked in through the nozzle, and a single piece of paper on the top layer is adsorbed;
when the air pump stops spraying air to the air outlet pipe, the first spring pulls the slider back, drive transmission device drive piece work through the connecting rod simultaneously, transmission device drives inner tube upward movement expansion plate top, the slider presses starting switch when the return, starting switch starts time delay device and actuating lever work, the actuating lever pops out the expansion plate, time delay device opens the intake pipe after a period of time, outside air gets into urceolus and inner tube through the intake pipe under the atmospheric pressure effect inside, make adsorbed paper drop to the expansion plate when reaching atmospheric pressure equilibrium, when the air pump blows the air outlet pipe once more, the slider moves to the shower nozzle direction, starting switch plays the control actuating lever and withdraws, the expansion plate is retrieved, transport the paper to transport mechanism on, time delay device closes simultaneously, thereby close the air inlet.
The beneficial effect that this scheme produced is: 1. by adopting the air suction type paper separation, the paper suction head can only suck a single piece of paper each time, thereby effectively solving the problem that the existing paper separation mechanism can feed a plurality of pieces of paper due to paper separation errors; 2. through the cooperation of the sliding block connecting rod and the transmission device, the inner cylinder of the paper suction device is matched with the transmission device, the inner cylinder can be controlled to lift through the air flow in the air outlet pipe, the lifting mechanism is not required to be additionally arranged, the working energy consumption of the device is reduced, the occupied space of the device is reduced, the structure is simple, the realization is easy, and the manufacturing cost is reduced.
Further, the transmission device comprises a driving gear arranged close to the air injection device and a driven gear arranged close to the paper suction device, the driving gear and the driven gear are both rotatably connected with the rack, two driving gears are sleeved with toothed belts which are double-sided teeth, inner surface teeth of the toothed belts are matched with the driving gear, the driven gear is matched with the outer surface of the toothed belts, and the connecting rod is embedded into outer surface teeth of the toothed belts; and one side of the outer wall of the inner cylinder, which is close to the driven gear, is provided with sawteeth matched with the driven gear. The transmission is carried out through the matching of the gear and the toothed belt, the lifting of the inner cylinder is controlled, and the structure is simple and easy to realize.
Further, the time delay device comprises an air bag arranged above the air inlet pipe, the air bag is connected with the air pump through an inflation tube, an air discharge pipe is further arranged on the air bag, an electronic valve is arranged in the air discharge pipe and electrically connected with the controller, a vertical baffle is arranged in the air inlet pipe of the outer barrel, the vertical baffle upwards extends out of the air inlet pipe, a horizontal baffle is arranged at the upper end of the vertical baffle, and the horizontal baffle is located above the air bag. When the starting switch is pressed down, the electronic valve is closed, the air pump inflates the air bag through the air inlet pipe, the air bag gradually lifts the horizontal baffle plate upwards along with the increase of air, so that the vertical baffle plate is lifted upwards, then the air inlet pipe is opened, and external air can enter the paper suction mechanism.
Furthermore, a bottom plate is arranged below the paper placing plate, the bottom plate is fixedly connected with the rack, the paper placing plate is connected with the rack in a sliding mode, and a second spring is connected between the bottom plate and the paper placing plate. Through setting up the second spring, when the paper on the bottom plate reduces gradually, lift the bottom plate gradually under the elasticity effect, the adsorption device of being convenient for adsorbs the paper better.
Furthermore, a limiting paper baffle is connected to the paper placing plate in a sliding mode, and a paper pressing sheet is connected to the upper end of the limiting paper baffle through a bolt. The paper is pressed down through the paper pressing sheet, so that the paper is prevented from flying out during air injection.
Furthermore, the air outlet pipe is provided with a Venturi tube, and the air suction pipe is connected with the throat part of the Venturi tube. Through setting up venturi, when the air current was through the venturi throat, the velocity of flow increased, and atmospheric pressure reduces fast and forms the negative pressure, improves the suction of outlet duct to the trachea.
Drawings
FIG. 1 is a schematic view of an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B of fig. 1.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the air outlet pipe 10, the sliding block 11, the first spring 12, the connecting rod 13, the starting switch 14, the connecting rod sliding groove 15, the Venturi tube 16, the driving gear 20, the toothed belt 21, the driven gear 22, the outer cylinder 30, the inner cylinder 31, the air suction pipe 32, the air inlet pipe 33, the air storage chamber 40, the air bag 41, the vertical baffle plate 42, the horizontal baffle plate 43, the inflation pipe 44, the air discharge pipe 45, the paper discharge plate 50, the second spring 51, the limiting paper baffle plate 52, the paper pressing sheet 53, the expansion plate 54 and the horizontal plate 60.
The embodiment is basically as shown in the attached figures 1 and 2: a paper separating device comprises a rack and a controller (not shown), wherein the rack comprises a vertical plate and a horizontal plate 60 (not shown in a vertical plate drawing), and further comprises a paper suction device, an air injection device, an air pump and a transmission device provided with a driven part and a driving part, a paper placing plate 50 is arranged on the horizontal plate 60 of the rack, the air injection device comprises a spray head and an air outlet pipe 10, one end of the air outlet pipe 10 is connected with the air pump, a slide block 11 is arranged in the air outlet pipe 10, a starting switch 14 electrically connected with the controller is arranged on the inner wall of the bottom of the air outlet pipe 10, the slide block 11 is connected with the inner wall of the air outlet pipe 10 through a first spring 12, one end of the slide block 11 is fixedly connected with a connecting; the upper end of the air outlet pipe 10 is provided with a connecting rod sliding groove 15, an elastic sealing strip is arranged in the sliding groove to ensure the air tightness of the air outlet pipe 10, and the transmission device is rotatably connected with a vertical plate of the frame.
When air flow passes through the air outlet pipe 10, the air flow pushes the sliding block 11 to move, the sliding block 11 can drive the connecting rod 13 to move when sliding, so that the driving part of the transmission device is driven to work, the air pump is controlled by pulse type current, and when the controller receives the required paper quantity, the same quantity of pulse current is input to control the air pump to work, so that the air pump works intermittently.
The paper suction device comprises an outer cylinder 30 connected with the frame and an inner cylinder 31 connected with the outer cylinder 30 in a sliding way, the lower end of the inner cylinder 31 is provided with a paper suction head, and the inner cylinder 31 is connected with a driven part of the transmission device; the side wall of the outer cylinder 30 is communicated with the air outlet pipe 10 through an air inlet pipe 32, a one-way valve is arranged in the air inlet pipe 32, the air outlet pipe 10 is provided with a Venturi tube 16, and the air inlet pipe 32 is connected with the throat part of the Venturi tube 16; the side wall of the outer cylinder 30 far away from the air suction pipe 32 is provided with an air inlet pipe 33, and the air inlet pipe 33 is provided with a time delay device; a paper conveying mechanism is arranged above the paper placing plate 50, a telescopic cavity with an opening close to the paper suction device is arranged in the paper conveying mechanism, a driving rod is arranged in the telescopic cavity, one end of the driving rod is connected with the inner wall of the telescopic cavity far away from the paper suction device, the other end of the driving rod is connected with a telescopic plate 54, the driving rod adopts a cylinder, and the cylinder is electrically connected with a controller.
The transmission device comprises a driving part and a driven part, the driving part comprises a driving gear 20 arranged close to the air injection device, the driving gear 20 is provided with two toothed belts 21 which are sleeved outside, and the driven part comprises a driven gear 22 arranged close to the paper suction device; the driving gear 20 and the driven gear 22 are both rotationally connected with the rack, the toothed belt 21 is double-sided teeth, inner surface teeth of the toothed belt 21 are matched with the driving gear 20, the driven gear 22 is matched with outer surface teeth of the toothed belt 21, and the connecting rod 13 is embedded into the outer surface teeth of the toothed belt 21; and saw teeth matched with the driven gear 22 are arranged on one side, close to the driven gear 22, of the outer wall of the inner cylinder 31. When the slide block 11 moves towards the direction close to the spray head, the slide block 11 drives the toothed belt 21 to move through the connecting rod 13, the toothed belt 21 drives the driving gear 20 to rotate clockwise, the driven gear 22 is driven by the chain to rotate anticlockwise, and therefore the inner cylinder 31 matched with the driven gear 22 moves downwards; when the slider 11 moves away from the nozzle, the slider 11 drives the toothed belt 21 to move through the connecting rod 13, the toothed belt 21 drives the driving gear 20 to move counterclockwise, the driven gear 22 is driven by the chain to rotate clockwise, and the inner cylinder 31 matched with the driven gear 22 moves upward.
As shown in fig. 3, the time delay device includes an air storage chamber 40 disposed above the air inlet pipe 33, an air bag 41 is disposed in the air storage chamber 40, the air bag 41 is connected to an air pump through an inflation tube 44, an air release tube 45 is further disposed on the air bag 41, an electronic valve is disposed in the air release tube 45 and electrically connected to the controller, a vertical baffle 42 is disposed in the air inlet pipe 33 of the outer cylinder 30, the vertical baffle 42 extends upwards to form the air inlet pipe 33, a horizontal baffle 43 is disposed at an upper end of the vertical baffle 42, and the horizontal baffle 43 is disposed above the air bag 41. When the starting switch 14 is pressed down, the electronic valve is controlled to be closed through the controller, the air pump inflates the air bag 41 through the air inlet pipe 33, the air bag 41 gradually lifts the horizontal baffle upwards along with the increase of air, so that the vertical baffle is lifted upwards, then the air inlet pipe 33 is opened, so that external air can enter the interior of the paper suction mechanism, when the starting switch 14 is bounced, the electronic valve is controlled to be opened through the controller, the air bag 41 is deflated, the vertical baffle is lowered, and the air inlet pipe 33 is closed.
The paper placing plate 50 is connected with a limiting paper baffle plate 52 in a sliding way, and the upper end of the limiting paper baffle plate is connected with a paper pressing sheet 53 through a bolt. The paper is pressed down through the paper pressing sheet 53, so that the paper is prevented from flying out during air injection; the paper placing plate 50 is connected with a limiting paper baffle plate 52 in a sliding way, and the upper end of the limiting paper baffle plate is connected with an elastic paper pressing sheet 53 through a bolt. The paper is pressed down by the paper pressing piece 53, and the paper is prevented from flying out during air injection. When the paper pressing angle of the paper pressing piece 53 needs to be adjusted, the bolt can be unscrewed, and the bolt is screwed after the angle is adjusted.
The specific implementation process is as follows:
the air pump is controlled by pulse current, so that intermittent operation is realized, the air pump sprays air through the air outlet pipe 10 and the spray head to blow and disperse paper, when air flow passes through the air outlet pipe 10, the sliding block 11 is pushed to move towards the spray head, the connecting rod 13 arranged on the sliding block 11 also moves towards the spray head, so that the transmission device is driven by the connecting rod 13 to work, and the inner cylinder 31 is driven by the transmission device driven part to move downwards to the position below the telescopic plate 54; meanwhile, when the air flow passes through the joint of the air suction pipe 32 and the air outlet pipe 10, the air pressure is reduced due to the large air flow velocity, so that negative pressure is generated, air in the air suction pipe 32 flows into the air outlet pipe 10 through the one-way valve, negative pressure is formed in a cavity between the outer cylinder 30, the inner cylinder 31 and the air suction pipe 32, external air is sucked through the nozzle, and a single paper sheet at the top layer is adsorbed;
when the air pump stops injecting air to the air outlet pipe 10, the first spring 12 pulls the sliding block 11 back, meanwhile, the driving part of the transmission device is driven to work through the connecting rod 13, the transmission device drives the inner cylinder 31 to move upwards above the expansion plate 54, the sliding block 11 presses the starting switch 14 when returning, the starting switch 14 starts the time delay device and the driving rod to work, the driving rod is preferably an air cylinder, the controller starts the air cylinder to extend out so as to eject the expansion plate 54, the air inlet pipe 33 is opened after the time delay device passes through a period of time, external air enters the outer cylinder 30 and the inner cylinder 31 through the air inlet pipe 33 under the action of atmospheric pressure, when the air pressure is balanced, the adsorbed paper drops onto the expansion plate 54, when the air pump blows air to the air outlet pipe 10 again, the sliding block 11 moves towards the direction of the spray head, the starting switch 14 bounces to control the driving rod to withdraw, the, thereby closing the air inlet.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (6)
1. A paper separating device comprises a frame and a controller, and is characterized in that: the paper feeding device comprises a frame, a paper suction device, an air injection device, an air pump and a transmission device provided with a driven part and a driving part, wherein the frame is provided with a paper discharge plate, the air injection device comprises a spray head and an air outlet pipe, one end of the air outlet pipe is connected with the air pump, a sliding block is arranged in the air outlet pipe, the inner wall of the bottom of the air outlet pipe is provided with a starting switch electrically connected with a controller, the sliding block is connected to the inner wall of the air outlet pipe through a first spring, one end of the sliding block is; the paper suction device comprises an outer cylinder connected with the rack and an inner cylinder connected with the outer cylinder in a sliding manner, a paper suction head is arranged at the lower end of the inner cylinder, and the inner cylinder is connected with a driven part of the transmission device; the side wall of the outer cylinder is communicated with the air outlet pipe through an air suction pipe, and a one-way valve is arranged in the air suction pipe; the side wall of the outer cylinder, which is far away from the air suction pipe, is provided with an air inlet pipe, and the air inlet pipe is provided with a time delay device; a paper transmission mechanism is arranged above the paper placing plate, a driving rod is arranged in the paper transmission mechanism, and one end of the driving rod is connected with a telescopic plate.
2. The paper separation device of claim 1, wherein: the transmission device comprises a driving gear arranged close to the air injection device and a driven gear arranged close to the paper suction device, the driving gear and the driven gear are both rotatably connected with the rack, two driving gears are sleeved with toothed belts, the toothed belts are double-sided teeth, inner surface teeth of the toothed belts are matched with the driving gear, the driven gear is matched with the outer surface of the toothed belts, and the connecting rod is embedded into outer surface teeth of the toothed belts; and one side of the outer wall of the inner cylinder, which is close to the driven gear, is provided with sawteeth matched with the driven gear.
3. The paper separation device of claim 1, wherein: the time delay device comprises an air bag arranged above the air inlet pipe, the air bag is connected with an air pump through an inflation tube, an air outlet pipe is further arranged on the air bag, an electronic valve is arranged in the air outlet pipe and electrically connected with the controller, a vertical baffle is arranged in the air inlet pipe of the outer barrel, the vertical baffle upwards extends out of the air inlet pipe, a horizontal baffle is arranged at the upper end of the vertical baffle, and the horizontal baffle is located above the air bag.
4. The paper separation device of claim 1, wherein: a bottom plate is arranged below the paper placing plate, the bottom plate is fixedly connected with the rack, the paper placing plate is connected with the rack in a sliding mode, and a second spring is connected between the bottom plate and the paper placing plate.
5. The paper separation device of claim 1, wherein: the paper placing plate is connected with a limiting paper baffle in a sliding mode, and the upper end of the limiting paper baffle is connected with a paper pressing sheet.
6. The paper separation device of claim 1, wherein: the air outlet pipe is provided with a Venturi tube, and the air suction pipe is connected with the throat part of the Venturi tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112413.9A CN112938554B (en) | 2021-01-27 | 2021-01-27 | Paper separating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110112413.9A CN112938554B (en) | 2021-01-27 | 2021-01-27 | Paper separating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112938554A true CN112938554A (en) | 2021-06-11 |
| CN112938554B CN112938554B (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110112413.9A Active CN112938554B (en) | 2021-01-27 | 2021-01-27 | Paper separating device |
Country Status (1)
| Country | Link |
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| CN (1) | CN112938554B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113619131A (en) * | 2021-07-12 | 2021-11-09 | 伟弘智造(上海)包装科技股份有限公司 | Inhale paper tectorial membrane production line equipment |
| CN114873318A (en) * | 2022-04-11 | 2022-08-09 | 如皋德宝印刷机械有限公司 | Pressure adjusting device of printing machine paper conveying part by utilizing negative pressure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113619131A (en) * | 2021-07-12 | 2021-11-09 | 伟弘智造(上海)包装科技股份有限公司 | Inhale paper tectorial membrane production line equipment |
| CN114873318A (en) * | 2022-04-11 | 2022-08-09 | 如皋德宝印刷机械有限公司 | Pressure adjusting device of printing machine paper conveying part by utilizing negative pressure |
| CN114873318B (en) * | 2022-04-11 | 2024-03-12 | 如皋德宝印刷机械有限公司 | Pressure regulating device of printer paper feeding part utilizing negative pressure |
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| CN112938554B (en) | 2023-04-07 |
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