CN101071094A - Shaft sampling and pneumatic conveying device - Google Patents
Shaft sampling and pneumatic conveying device Download PDFInfo
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- CN101071094A CN101071094A CN 200710034852 CN200710034852A CN101071094A CN 101071094 A CN101071094 A CN 101071094A CN 200710034852 CN200710034852 CN 200710034852 CN 200710034852 A CN200710034852 A CN 200710034852A CN 101071094 A CN101071094 A CN 101071094A
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- steel pipe
- sampling
- swash plate
- conveying device
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Abstract
Rod-shaped sample and gas conveying equipment is used for the tobacco industry cigarette or filter tip sampling and gas conveying, formed by the sampling and gas conveying components. The outer steel tube of sampling is connected with double role leaf-swing cylinder, and double-acting cylinder is oscillated with a two terminals detection devices. Sampling's ramp board has a down fork in each side, and fork is below the bottom edge of the start of the conveyor belt above. In the sampling part there is a positioning mechanism and in the sampling has a steel pipe wall oblique incision. The advantage of the invention is: double acting cylinder oscillating blade-driven, steel pipe, revolving reliable, accelerating the sampling rate; and ramp ends of the fork will not make cigarette block in the lower part and ramp conveyor belt between the inner and outer pipe through fixed sampling; it is not easy bending and block deadly, and so on.
Description
Technical field
The present invention relates to tobacco machine, promptly shaft refers to that cigarette props up or the sampling and pneumatic conveying device of filter stick.
Background technology
The introduction of same category of device at present:
The cigarette of cigarette machine production props up the passage that (or filter-stick forming device produce filter stick) be made up of upper and lower belt conveyor and is transported to downstream machine.This device extracts the sample that cigarette props up (or filter stick) from passage randomly, and cigarette props up (or filter stick) and is compressed air and is blown in the detecting instrument at once.And be installed on the passage that cigarette props up (or filter stick).
Before the present invention, the principle of work of same category of device: as shown in Figure 1, transfer passage is made up of bottom belt conveyor 2, top belt conveyor 3, Internal baffle 4, outer poly (methyl methacrylate) plate 5, cigarette props up (or filter stick) and is clipped between bottom belt conveyor 2 and the top belt conveyor 3, and it is towards identical with outer steel pipe 6.The moving direction that cigarette props up (or filter stick) is direction as shown in Figure 1.
Cigarette props up (or filter stick) and props up under the promotion of (or filter stick) at bottom belt conveyor 2, top belt conveyor 3 and follow-up cigarette, moves (as shown in Figure 2) along the longer inclined-plane of swash plate 7.Interior steel pipe 9 does not rotate, and otch upwards.Outer steel pipe 6 rotations, its power is produced by rotary magnet 12, is transferred to outer steel pipe 6 by pinion wheel 11, gear wheel 10.
When needing sampling, outer steel pipe 6 otch make progress, and a cigarette props up (or filter stick) and falls under gravity in the interior steel pipe 9.Outer steel pipe 6 rotations are till the otch of interior steel pipe 9 is covered.Open first compressed air inlet 1 subsequently, and pressure is adjusted the proper compression air and is blown in the interior steel pipe 9, cigarette is propped up (or filter stick) and sends into conveying steel pipe 19.
In Fig. 3, when cigarette props up (or filter stick) through fiber switch 16, fiber switch 16 sends a pulse signal, after the PLC controller is received pulse signal, at first make rotary cylinder 18 drive ball valve core 15 and be rotated counterclockwise 90 °, rotation back ball valve core 15 is closed cigarette and is propped up (or filter stick) inlet, and the transfer passage inlet is aimed in another compressed air inlet simultaneously.Open second compressed air inlet 42 subsequently, and pressure is adjusted the proper compression air and is blown in the accurate transfer passage, cigarette is propped up (or filter stick) and send in the reception clamping device by conveying steel pipe 19.
In addition, after the PLC controller is received pulse signal, close first compressed air inlet 1, outer steel pipe 6 opposite spins make outer steel pipe 6 otch upwards, perform the preparation of getting second sample.
The deficiency of present same category of device:
1, rotary magnet 12 work is unreliable, because rotary magnet 12 returns are springs, returning place force is less, in case dust enter between the steel pipe 9, outer steel pipe 6, the fault that outer steel pipe 6 can't return often appears.
2, whether outer steel pipe 6 is rotated in place no detecting element.It is that an end falls into earlier that cigarette props up the attitude great majority that (or filter stick) fall into, and falls into behind the other end, wholely falls into also faster or slower of time.When sampling frequency was very fast, cigarette propped up (or filter stick) and is clipped in easily between interior steel pipe 9, the outer steel pipe 6, after breaking down, because no detecting element causes the PLC controller to report to the police.The operator can not in time be fixed a breakdown.
3, cigarette props up (or filter stick) and is stuck in once in a while between bottom belt conveyor 2 and the swash plate 7.A small amount of cigarette props up (or filter stick) and takes a mouthful seam broken, and the wrapping paper that cigarette props up (or filter stick) surface enters between belt conveyor 2 and the swash plate 7, causes whole cigarette to prop up (or filter stick) and is stuck between bottom belt conveyor 2 and the swash plate 7.
4, interior steel pipe 9 and outer steel pipe 6 are difficult for guaranteeing with the centering of swash plate 7, outer poly (methyl methacrylate) plate 5, because of interior steel pipe 9 is elongated thin walled tubes with outer steel pipe 6, be in vacant state in mechanism, easily bending phenomenon occurs with outer steel pipe 6 for interior steel pipe 9, causes outer steel pipe 6 to rotate.
Summary of the invention
The objective of the invention is to:
1, solves the insecure problem of rotary magnet work.
2, increase by two detecting elements, make outer steel pipe when opening fully or covered fully, have signal to send the PLC controller to.
3, improve the structure of swash plate, make cigarette prop up (or filter stick) and can not be stuck between bottom belt conveyor and the swash plate.
4, increase detent mechanism, steel pipe and outer steel pipe and swash plate, outer poly (methyl methacrylate) plate are in the centering state in making.
5,, prevent that effectively cigarette from propping up (or filter stick) and damaging with the grooving end face at angular cut of inwall processing of interior steel pipe.
The object of the present invention is achieved like this:
This shaft sampling and pneumatic conveying device, form by sampling part and strength transport portion, sampling part comprises bottom belt conveyor and top belt conveyor, there are poly (methyl methacrylate) plate and Internal baffle in the belt both sides, on the belt conveyor of bottom swash plate is arranged, concentric interior steel pipe and outer steel pipe are arranged on the swash plate, interior steel pipe is fixed, otch is arranged at top, outer steel pipe also has an otch, the strength transport portion comprises transfer passage, fiber switch, the PLC controller, rotary cylinder and ball valve, fiber switch, rotary cylinder and ball valve are installed on the transfer passage, PLC controller and fiber switch, rotary cylinder links to each other, and rotary cylinder links to each other with ball valve, it is characterized in that outer steel pipe links to each other with the double-acting blade-type oscillating cylinder.
2 terminal detecting elements are installed on the double-acting blade-type oscillating cylinder, and the terminal detecting element is electrically connected with the PLC controller, and the PLC controller is electrically connected with the valve of the compressed air inlet of transfer passage.
There is downward fork the both sides of swash plate, fork rise initial line be lower than the bottom belt conveyor above, the width of each fork is the sixth of shaft length.
Be provided with detent mechanism in sampling part, detent mechanism lodge body and tray filling machine wallboard, the aperture that three correspondences are respectively arranged on casing and the tray filling machine wallboard, the hole that the pitch-row precision is high, above hole be equipped with in steel pipe and outer steel pipe, below two fixed bars are installed in two parallel holes, on the tray filling machine wallboard, locating piece is arranged by screw retention, have on the locating piece two install and fix cut that bar uses the hole, by holding screw with the fixed bar locking, internal fixation plate is housed on the fixed bar, register pin is housed on the internal fixation plate, be fixed with swash plate on the register pin, the front end of fixed bar is equipped with front shoe, by screw with outer poly (methyl methacrylate) plate, front shoe links to each other with swash plate.
Inwall at interior steel pipe has an angular cut.
The principle of the present invention and the course of work:
The rotation of the outer steel pipe of double-acting blade-type oscillating cylinder control.Adopt reduction valve to adjust compressed-air actuated pressure, reach the purpose that changes double-acting blade-type oscillating cylinder output torque.Compressed-air actuated pressure is too small, and double-acting blade-type oscillating cylinder output torque is little, causes outer steel pipe rotation unreliable.Compressed-air actuated pressure is excessive, double-acting blade-type oscillating cylinder output torque is big, cause the cigarette that is clipped between interior steel pipe, the outer steel pipe to prop up (or filter stick) and cut off fully, and the cigarette of being cut off props up (or filter stick) in case be transported to detecting instrument, and detecting instrument is broken down.Compressed-air actuated pressure size is adjusted to and is made outer steel pipe rotation reliable, is unlikely to cut off cigarette again and props up (or filter stick).
The double-acting blade-type oscillating cylinder is installed two terminal detecting elements.When the otch of steel pipe was covered in outer steel pipe rotates to, the terminal detecting element sent the signal that is rotated in place, and the PLC controller is opened first compressed air inlet at once, pressure is adjusted the proper compression air be blown into interior steel pipe.In original equipment, the endless detecting element, when guaranteeing that outer steel pipe covers the otch of interior steel pipe fully, first compressed air inlet just can be opened, rotary magnet is set to be got electric than after the long time, just open first compressed air inlet, and this directly influences the quantity of sampling in the unit interval.
When cigarette props up (or filter stick) and is clipped between interior steel pipe, the outer steel pipe, outer steel pipe can't rotate to terminal point, make the terminal detecting element of double-acting blade-type oscillating cylinder can't send information, in official hour, the PLC controller is not received the information of terminal detecting element.Device thinks that cigarette props up (or filter stick) and is clipped between interior steel pipe, the outer steel pipe, sends failure message simultaneously, and request is manually fixed a breakdown.
Swash plate after improvement two ends on the basis of original swash plate respectively increase by two forks.Fork rise initial line be lower than the bottom belt conveyor above.Carry cigarette prop up (or filter stick) with the width of belt be cigarette prop up (or filter stick) length 3/5ths.The width of each fork is the sixth that cigarette props up (or filter stick) length.When the longer inclined-plane that cigarette props up (or filter stick) swash plate after improving moved, the fork on swash plate both sides propped up (or filter stick) to cigarette and breaks away from belt conveyor bigger lifting force is arranged.The wrapping paper that props up (or filter stick) surface if any cigarette enters between belt conveyor and the swash plate, and the lifting force that the fork on swash plate both sides produces also can make it break away from belt conveyor.
Steel pipe and outer steel pipe and swash plate, outer poly (methyl methacrylate) plate were in the centering state in detent mechanism made.Whole detent mechanism designs according to the plane and two pits positioning principle, at first casing, three holes are respectively arranged above the tray filling machine wallboard, there is the degree of precision requirement in the aperture, also there is the degree of precision requirement pitch-row and mutual alignment, above hole install in steel pipe and outer steel pipe, below two parallel holes two fixed bars are installed, the excircle dimension of fixed bar has the degree of precision requirement.The hole of steel pipe and outer steel pipe was coaxial in casing, tray filling machine wallboard were installed like this.
In order to prevent the fixed bar axial motion, locating piece is fixed on the tray filling machine wallboard by sunk screw, the hole that two fixed bars are installed is a cut, install and fix bar after, by holding screw with its locking.
The location of semicircle orifice on the swash plate and interior steel pipe and outer steel pipe is realized that by internal fixation plate internal fixation plate has four holes, and two install and fix bar, other two installing and locating pins, and there is the degree of precision requirement in the aperture, and also there is the degree of precision requirement pitch-row and mutual alignment.Two holes of semicircle orifice on the swash plate and installing and locating pin, there is the degree of precision requirement in the aperture, and also there is the degree of precision requirement pitch-row and mutual alignment.Semicircle orifice on the swash plate is coaxial with the hole of interior steel pipe and outer steel pipe like this.
Because the hole of interior steel pipe of installation and outer steel pipe requires to hang down a bit a little with the right alignment of outer steel pipe cylindrical on the outer poly (methyl methacrylate) plate.Realize by front shoe, little socket head cap screw, sunk screw.
At angular cut of inwall processing of interior steel pipe, prevent that effectively cigarette from propping up (or filter stick) and damaging with the grooving end face.After the rotation of outer steel pipe, the otch of interior steel pipe is covered.Open first compressed air inlet, cigarette props up (or filter stick) under the effect of high velocity air, rapid axial moves, be mixed with radial vibration simultaneously, if the inwall of interior steel pipe does not have angular cut, cigarette props up (or filter stick) and bumps with end face once in a while and rush, and causing cigarette to prop up (or filter stick) termination has wrinkle.
Advantage of the present invention is:
1, with behind the double-acting blade-type oscillating cylinder replacement rotary magnet, outer steel pipe rotation is reliable.In addition, during the work of double-acting blade-type oscillating cylinder, do not produce heat, and the coil of rotary magnet produces heat, easily burns.
2, the double-acting blade-type oscillating cylinder is installed two terminal detecting elements, has accelerated the quantity of sampling in the unit interval.In addition, when cigarette prop up (or filter stick) be clipped in steel pipe and outside between the steel pipe time, the PLC controller sends failure message, request is manually fixed a breakdown.Guarantee effective work ratio of whole device.
3, the swash plate two ends on the basis of original swash plate after the improvement respectively increase by two forks, make cigarette prop up (or filter stick) and can't be stuck between bottom belt conveyor and the swash plate.
4, increase detent mechanism, steel pipe and outer steel pipe and swash plate, outer poly (methyl methacrylate) plate are in the centering state in making.Interior steel pipe and outer steel pipe are through fixing, and be not flexible, and outer steel pipe rotation can be not stuck.
When cigarette props up (or filter stick) when length changes (this demand of cigar mill is more at present), only need unclamp two holds screw tightly, and fixed bar can move axially.Drive outer poly (methyl methacrylate) plate and move axially, reach the purpose that the change cigarette props up (or filter stick) channel width along fixed bar.
5,, prevent that effectively cigarette from propping up (or filter stick) and damaging with the grooving end face at angular cut of inwall processing of interior steel pipe.
Description of drawings
Fig. 1 is the stereographic map of traditional sampling and pneumatic conveying device
Fig. 2 is the drawing in side sectional elevation of traditional sampling and pneumatic conveying device
Fig. 3 is the longitudinal diagram of traditional sampling and pneumatic conveying device
Fig. 4 is the stereographic map of sampling and pneumatic conveying device of the present invention
Fig. 5 is the drawing in side sectional elevation of sampling and pneumatic conveying device of the present invention
Fig. 6 is the longitudinal diagram of sampling and pneumatic conveying device of the present invention
Fig. 7 is that vane-type pneumatic rotary actuator of the present invention is installed stereographic map
Fig. 8 is the top perspective view of detent mechanism of the present invention
Fig. 9 is the face upwarding stereogram of detent mechanism of the present invention
Figure 10 is an I of the present invention portion enlarged drawing
Among the figure: 1, first compressed air inlet 2, bottom belt conveyor 3, top belt conveyor 4, Internal baffle 5, outer poly (methyl methacrylate) plate 6, outer steel pipe 7, original swash plate 8, fixed bar 9, interior steel pipe 10, gear wheel 11, pinion wheel 12, rotary magnet 13, internal fixation plate 14, ball valve seat 15, ball valve core 16, fiber switch 17, delivery outlet 18, rotary cylinder 19, conveying steel pipe 20, double-acting blade-type oscillating cylinder 21, swash plate 22 after the improvement, front shoe 23, register pin 24, little holding screw 25, terminal detecting element 26, gas-tpe fitting 27, hold screw 28 tightly, locating piece 29, big socket head cap screw 30, sunk screw 31, little socket head cap screw 32, big holding screw 33, casing 34, an initial line 35 of fork, tray filling machine wallboard 36, cigarette props up the moving direction 37 of (or filter stick), tray filling machine 38, sampling and pneumatic conveying device 39, the fork 40 of swash plate, shaft enters the direction 41 of steel pipe, angular cut 42, second compressed air inlet 43, shaft (cigarette props up or filter stick).
Embodiment
Below in conjunction with accompanying drawing 4-10, the specific embodiment of the present invention is described in detail as follows:
In Fig. 4, sampling and pneumatic conveying device 38 is installed on the tray filling machine 37, and arrow 36 props up the moving direction of (or filter stick) for cigarette, and respectively there are two forks at swash plate 21 two ends after the improvement, and the width of the fork 39 of swash plate is the sixth of shaft length.There are outer poly (methyl methacrylate) plate 5 and Internal baffle 4 in the belt conveyor both sides.
In Fig. 5, swash plate 21 is arranged on the bottom belt conveyor 2, the initial line 34 that rises of the fork of swash plate 21 is lower than bottom belt conveyor 2, concentric interior steel pipe 9 and outer steel pipe 6 are arranged on the swash plate 21, interior steel pipe 9 is fixed, otch is arranged at top, and outer steel pipe 6 also has an otch, and outer steel pipe 6 links to each other with double-acting blade-type oscillating cylinder 20 with pinion wheel 11 by gear wheel 10.Shaft (cigarette props up or filter stick) 43 moved along the longer inclined-plane of swash plate 21.
In Fig. 6, fiber switch 16, rotary cylinder 18 and ball valve core 15 are installed on the transfer passage, and the PLC controller links to each other with fiber switch 16, rotary cylinder 18, and rotary cylinder 18 links to each other with the ball valve core 15 of control second compressed air inlet 42.Ball valve core 15 is arranged in ball valve seat 14.40 directions that enter steel pipe for shaft, it is towards identical with outer steel pipe 6.Shaft enters conveying steel pipe 19 by delivery outlet 17 after entering the sampling steel pipe under compressed-air actuated effect.
In Fig. 7, gas- tpe fitting 26 and 2 terminal detecting elements 25 are installed on the double-acting blade-type oscillating cylinder 20, terminal detecting element 25 is electrically connected with the PLC controller.Register pin 23 is housed on the internal fixation plate 13, is fixed with swash plate 21 on the register pin 23, adjust the relative position of internal fixation plate 13 and swash plate 21 by little holding screw 24.
In Fig. 8, detent mechanism comprises casing 33 and tray filling machine wallboard 35, the aperture that three correspondences are respectively arranged on casing 33 and the tray filling machine wallboard 35, the hole that the pitch-row precision is high, above hole be equipped with in steel pipe 9 and outer steel pipe 6, below two fixed bars 8 are installed in two parallel holes, on tray filling machine wallboard 35, be fixed with locating piece 28 by big socket head cap screw 29, have on the locating piece 28 two installations with decide bar 8 usefulness cut the hole, by holding screw 27 tightly with fixed bar 8 lockings, front shoe 22 links to each other with fixed bar 8 by sunk screw 30, and outer poly (methyl methacrylate) plate 5 links to each other with swash plate 21 with front shoe 22 by little socket head cap screw 31.
In Fig. 9, the front end of fixed bar 8 is equipped with front shoe 22, and internal fixation plate 13 is fixed on the fixed bar 8 by big holding screw 32.
In Figure 10, on the interior steel pipe 9 angular cut 41 is arranged.
Claims (5)
1, shaft sampling and pneumatic conveying device, form by sampling part and strength transport portion, sampling part comprises bottom belt conveyor and top belt conveyor, there are poly (methyl methacrylate) plate and Internal baffle in the belt both sides, on the belt conveyor of bottom swash plate is arranged, concentric interior steel pipe and outer steel pipe are arranged on the swash plate, interior steel pipe is fixed, otch is arranged at top, outer steel pipe also has an otch, the strength transport portion comprises transfer passage, fiber switch, the PLC controller, rotary cylinder and ball valve, fiber switch, rotary cylinder and ball valve are installed on the transfer passage, PLC controller and fiber switch, rotary cylinder links to each other, and rotary cylinder links to each other with ball valve, it is characterized in that outer steel pipe links to each other with the double-acting blade-type oscillating cylinder.
2, shaft sampling and pneumatic conveying device according to claim 1, it is characterized in that, 2 terminal detecting elements are installed on the double-acting blade-type oscillating cylinder, and the terminal detecting element is electrically connected with the PLC controller, and the PLC controller is electrically connected with the valve of the compressed air inlet of transfer passage.
3, shaft sampling and pneumatic conveying device according to claim 1 is characterized in that, there is downward fork the both sides of swash plate, fork rise initial line be lower than the bottom belt conveyor above, the width of each fork is the sixth of shaft length.
4, shaft sampling and pneumatic conveying device according to claim 1, it is characterized in that, be provided with detent mechanism in sampling part, detent mechanism lodge body and tray filling machine wallboard, the aperture that three correspondences are respectively arranged on casing and the tray filling machine wallboard, the hole that the pitch-row precision is high, above hole be equipped with in steel pipe and outer steel pipe, below two fixed bars are installed in two parallel holes, on the tray filling machine wallboard, locating piece is arranged by screw retention, have on the locating piece two install and fix cut that bar uses the hole, by holding screw with the fixed bar locking, internal fixation plate is housed on the fixed bar, register pin is housed on the internal fixation plate, be fixed with swash plate on the register pin, the front end of fixed bar is equipped with front shoe, by screw with outer poly (methyl methacrylate) plate, front shoe links to each other with swash plate.
5, shaft sampling and pneumatic conveying device according to claim 1 is characterized in that, at the inwall of interior steel pipe an angular cut is arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710034852A CN100575911C (en) | 2007-04-27 | 2007-04-27 | Shaft sampling and pneumatic conveying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710034852A CN100575911C (en) | 2007-04-27 | 2007-04-27 | Shaft sampling and pneumatic conveying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101071094A true CN101071094A (en) | 2007-11-14 |
| CN100575911C CN100575911C (en) | 2009-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710034852A Expired - Fee Related CN100575911C (en) | 2007-04-27 | 2007-04-27 | Shaft sampling and pneumatic conveying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100575911C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107054976A (en) * | 2017-03-28 | 2017-08-18 | 河南中烟工业有限责任公司 | A kind of cigarette pipeline |
| CN108567164A (en) * | 2018-04-28 | 2018-09-25 | 武汉理工大学 | A kind of composite filter tip sequence conveying device based on Geldart-D particle |
| CN109975060A (en) * | 2019-04-22 | 2019-07-05 | 深圳烟草工业有限责任公司 | A kind of filter stick, the on-line automatic sampler of cigarette |
| CN113212834A (en) * | 2021-05-27 | 2021-08-06 | 龙岩烟草工业有限责任公司 | Cigarette conveying mechanism and cigarette processing system |
| CN115290373A (en) * | 2022-10-08 | 2022-11-04 | 山东省林业保护和发展服务中心 | Collecting, storing and transporting device for forest litter and using method thereof |
-
2007
- 2007-04-27 CN CN200710034852A patent/CN100575911C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107054976A (en) * | 2017-03-28 | 2017-08-18 | 河南中烟工业有限责任公司 | A kind of cigarette pipeline |
| CN107054976B (en) * | 2017-03-28 | 2019-07-23 | 河南中烟工业有限责任公司 | A kind of cigarette pipeline |
| CN108567164A (en) * | 2018-04-28 | 2018-09-25 | 武汉理工大学 | A kind of composite filter tip sequence conveying device based on Geldart-D particle |
| CN108567164B (en) * | 2018-04-28 | 2019-12-24 | 武汉理工大学 | Composite filter tip rod sorting and conveying device based on pneumatic conveying |
| CN109975060A (en) * | 2019-04-22 | 2019-07-05 | 深圳烟草工业有限责任公司 | A kind of filter stick, the on-line automatic sampler of cigarette |
| CN113212834A (en) * | 2021-05-27 | 2021-08-06 | 龙岩烟草工业有限责任公司 | Cigarette conveying mechanism and cigarette processing system |
| CN115290373A (en) * | 2022-10-08 | 2022-11-04 | 山东省林业保护和发展服务中心 | Collecting, storing and transporting device for forest litter and using method thereof |
| CN115290373B (en) * | 2022-10-08 | 2022-12-20 | 山东省林业保护和发展服务中心 | Collecting, storing and transporting device for forest litter and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100575911C (en) | 2009-12-30 |
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Granted publication date: 20091230 Termination date: 20190427 |