CN109104912A - Shovel tip rotates drag reduction subsoiler - Google Patents
Shovel tip rotates drag reduction subsoiler Download PDFInfo
- Publication number
- CN109104912A CN109104912A CN201810974058.4A CN201810974058A CN109104912A CN 109104912 A CN109104912 A CN 109104912A CN 201810974058 A CN201810974058 A CN 201810974058A CN 109104912 A CN109104912 A CN 109104912A
- Authority
- CN
- China
- Prior art keywords
- shovel tip
- subsoiler
- drag reduction
- shovel
- rack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B13/00—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation
- A01B13/08—Ploughs or like machines for special purposes ; Ditch diggers, trench ploughs, forestry ploughs, ploughs for land or marsh reclamation for working subsoil
- A01B13/10—Special implements for lifting subsoil layers
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B15/00—Elements, tools, or details of ploughs
- A01B15/02—Plough blades; Fixing the blades
- A01B15/025—Plough blades; Fixing the blades specially adapted for working subsoil
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B15/00—Elements, tools, or details of ploughs
- A01B15/02—Plough blades; Fixing the blades
- A01B15/04—Shares
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Soil Working Implements (AREA)
Abstract
The invention discloses a kind of shovel tips to rotate drag reduction subsoiler, including rack, rack two sides are symmetrically arranged with the deep device of limit, frame top is connected with suspension arrangement, gearbox is additionally provided in rack, the power output shaft of gearbox is connect with power transmission, and the power output shaft of power transmission is connect with subsoiling device；Subsoiling device includes shovel tip and spade, is fixedly connected at the top of spade with rack, and bottom is equipped with sleeve pedestal, and shovel tip passes through sleeve pedestal, and one end is exposed to outside sleeve pedestal, the power output axis connection of the other end and power transmission.The present invention provides a kind of completely new subsoilers, it uses the subsoiling shovel tip of subsoiler to rotate, only in the degree of packing, the biggish plough sole of bulk density and subsoil rotation operation, effectively reduce Subsoiler resistance, the soil being crushed is acted on without shock compaction, subsoiling bottom of trench is smooth after operation, simultaneously, operation power consumption is reduced, the reliability of Subsoiler is improved.
Description
Technical field
The present invention relates to agricultural machinery technological fields, rotate drag reduction subsoiler in particular to a kind of shovel tip.
Background technique
Subsoiling is one of core technology of conservation tillage, and soil can break hard plough sole by subsoiling, improve water
Divide utilization efficiency, reduce soil erosion, enhancing water and soil conservation ability, improve crop root growth environment, is conducive to crop root.
Therefore, subsoiling is an important technology for increasing deep root system crop yield.
Subsoiler is the key equipment for realizing mechanization Subsoiler, and operation consumption is the 3~5 of crop harvester tool
Times, how to reduce Subsoiler resistance is the critical issue for promoting deep-ploughing implement.The soil plough horizon of Subsoiler will be needed to be divided into
Topsoil (arable layer), plough sole and subsoil.By each layer soil weight and the degree of packing analysis known to the topsoil soil weight and
The degree of packing is good, and plough sole and the subsoil soil weight and the degree of packing are larger.It follows that the main drag sources of subsoiler in
Plow layer and the subsoil of shovel tip effect.How research important directions that shovel tip operation resistance be subsoiling drag reduction are reduced.
Currently, the common method of subsoiling drag reduction has vibrating drag reduction method.Vibrating subsoiling drag principle is moulded using the bullet of soil
Property, vibration displacement is placed in the elastic-plastic deformation area of soil, obtains its resistance again while being less than plastic deformation maximum resistance
The characteristics of must being plastically deformed, to reduce tractive resistance.Though Viberation deep coosener reduces working resistance, asked there is also following
Topic: 1) to the soil that has been crushed there is shock compaction effect；2) simultaneously, subsoiling bottom of trench out-of-flatness after operation；3) vibration easily makes subsoiling
Shovel and other component generate fatigue rupture, influence subsoiler service life, reduce the reliability of subsoiling machine operation.
Summary of the invention
Present invention aim to provide a kind of shovel tip rotation drag reduction subsoiler, the subsoiler operation quality is high, reduces
Subsoiler resistance, increases the reliability of Subsoiler.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of shovel tip rotates drag reduction subsoiler, including machine
Frame, the rack two sides are symmetrically arranged with the deep device of limit, and the frame top is connected with suspension arrangement, is additionally provided with speed change in the rack
The power output shaft of case, the gearbox is connect with power transmission, the power output shaft and depth of the power transmission
Loose device connection；The subsoiling device includes shovel tip and spade, is fixedly connected at the top of the spade with rack, and bottom is equipped with sleeve
Pedestal, the shovel tip pass through the sleeve pedestal, and one end is exposed to outside the sleeve pedestal, the other end and the power transmission
Power output axis connection.
Further, the power output shaft of the power transmission includes short axle and connecting shaft, and the short axle top connects
The power transmission is connect, the short axle bottom end connects the first universal transmission mechanism, first universal transmission mechanism and institute
The connection of connecting shaft top is stated, the connecting shaft bottom end connects the second universal transmission mechanism, second universal transmission mechanism and institute
State shovel tip connection.
Further, the power transmission includes the length being fixedly connected with the power output shaft of the gearbox
Axis and the power output shaft connecting with the subsoiling device, the long axis are equipped with small pulley, the short axle of the power output shaft
It is equipped with big belt wheel, the big belt wheel plane vertical small pulley plane is connected with skin between the big belt wheel and the small pulley
Band.
Further, first universal transmission mechanism includes the first active yoke, the first cross axle and first driven shaft
Fork, the first active yoke are fixedly connected with the short axle, and the first active yoke passes through first cross axle and institute
First driven shaft fork connection is stated, the first driven shaft fork is fixedly connected with the connecting shaft top.
Further, second universal transmission mechanism includes the second active yoke, the second cross axle and second driven shaft
Fork, the second active yoke are fixedly connected with the connecting shaft bottom end, and the second active yoke passes through second cross
Axis and second driven shaft fork connect, and the second driven shaft fork is detachably connected with the shovel tip.
Further, the shovel tip is in cone, and the circular cone basal diameter of the shovel tip is 40~60mm, before the shovel tip
Outer surface is held to be equipped with thread groove and the straight groove vertical with the thread groove.
Further, the center line angle with horizontal plane of the sleeve pedestal and the shovel tip is 25 °~35 °.
Further, the second driven shaft fork, second cross axle, the second active yoke and the connecting shaft
Equal≤described spade of cross-sectional diameter thickness；The spade with a thickness of 25~30mm.
Further, it is equipped with axis hole at the top of the shovel tip, symmetrically opens that there are two the first limit hole, two institutes on the axis hole
It states and is respectively equipped with card in the first limit hole, the card is equipped with cylindrical projection, and the cylindrical projection protrudes into first limit
In the hole of position, card has compressed spring between two cards；Second limit hole there are two symmetrically being opened on the second driven shaft fork, institute
It states second driven shaft fork to connect with the axis hole, and two cylindrical projections are respectively protruding into two second limit holes.
Further, the rack is equipped with supporter, the power transmission and the subsoiling device respectively with
The supporter is fixedly connected；The supporter front is provided with square breach, and bottom is equipped with reinforcing rib.
Compared with prior art, the invention has the following advantages that
First, using the subsoiling shovel tip of subsoiler to rotate the present invention provides a kind of completely new subsoiler, only in consolidation
Degree, the biggish plough sole of bulk density and subsoil rotation operation, effectively reduce Subsoiler resistance, to the soil being crushed without punching
Compaction is hit, subsoiling bottom of trench is smooth after operation, meanwhile, operation power consumption is reduced, the reliability of Subsoiler is improved.
Second, more stable, operation when surface has the rotation of the taper shovel tip of thread groove and straight groove that deep soil loosing shovel is made to bury
When can be further reduced plough sole and subsoil operation resistance, to reduce entire subsoiler operation resistance, while will not shadow
Ring Subsoiler quality.
Third, shovel tip uses cardan drive, it is compact-sized, easy to process；Taper shovel tip using card, compressed spring with
Second driven shaft fork installation, it is easy to disassemble.
Fourth, when the present invention solves larger because of shovel tip operation resistance, the technical issues of spade connecting component is easily damaged,
Subsoiler service life is extended, the operational reliability of subsoiler is further improved.
Detailed description of the invention
Fig. 1 is the schematic perspective view that a kind of shovel tip rotates drag reduction subsoiler.
Fig. 2 is power transmission schematic perspective view in Fig. 1.
Fig. 3 is supporter schematic perspective view in Fig. 1.
Fig. 4 is Fig. 1 short-and-medium axle schematic perspective view.
Fig. 5 is subsoiling device schematic perspective view in Fig. 1.
Fig. 6 is the power output shaft explosive view of power transmission in Fig. 1.
Fig. 7 is shovel tip schematic perspective view in Fig. 1.
In figure, 1-rack, 101-front beams, 102-left longitudinal beams, 103-rear cross beams, 104-right longitudinal beams, 2-
Suspension arrangement, 3-gearboxes, 4-subsoiling devices, 401-U-bolts, 402-spade connecting plates, 403-spades, 404-sets
Cylinder pedestal, 405-shovel tips, 406-second driven shafts fork, the 407-the second active yoke, 408-connecting shafts, 409-positioning spiral shells
Bolt, 410-first driven shafts fork, the 411-the first active yoke, the 412-the first cross axle, the 413-the second cross axle, 414-
Second limit hole, 415-cards, 416-compressed springs, the 417-the first limit hole, 418-axis holes, the deep device of 5-limits, 6-
Power transmission, 601-long axis, 602-small pulleys, 603-belts, 604-big belt wheels, 605-short axles, 606-is horizontal
Bearing and bearing block composition, 607-supporters, 608-vertical bearings and bearing block composition, 609-vertical support seats, 610-
Connect bolt, 611-reinforcing ribs, 612-square breach, 613-flat key holes, 614-dowel holes, 615-internal splines.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing, convenient for more clearly understanding the present invention, but they
Limiting the invention.
As shown in Figure 1, shovel tip rotation drag reduction subsoiler includes rack 1, suspension arrangement 2, gearbox 3, subsoiling device 4, limit
Deep device 5 and power transmission 6；Wherein, rack 1 includes front beam 101, left longitudinal beam 102, rear cross beam 103 and right longitudinal direction
Beam 104；Gearbox 3 and 2 front end of suspension arrangement are fixed in 101 middle part of front beam, and rear end is fixed in 103 middle part of rear cross beam；It is left and right
It is symmetrical to suppress device, is fixed in 104 outside of left longitudinal beam 102 and right longitudinal beam；After left and right subsoiling device is symmetrically fixed in
On crossbeam 103；Left and right power transmission 6 is symmetrically placed in the side that 3 two sides of gearbox and front beam 101 and rear cross beam 103 are formed
Above frame.
As shown in Figure 2 to 4, power transmission 6 include long axis 601, small pulley 602, belt 603, big belt wheel 604,
Short axle 605, horizontal bearing and bearing block composition 606, supporter 607, vertical bearing and bearing block form 608, vertical support seat
609 and connection bolt 610；Wherein, vertical support seat 609 is fixed in left 102 middle part upper surface of longitudinal beam；601 right end of long axis with
Constitute rotation connection on the left of gearbox 3, left end passes through the vertical bearing and bearing block group that are fixed in right above vertical support seat 609
It constitutes and is rotatablely connected with rack 1 at 608；607 front end of supporter is fixed on 103 left side of rear cross beam by 2 vertical connection bolts
Portion rear end；Horizontal bearing and bearing block composition 606 are fixed on 607 upper surface of supporter by left and right bolt；Short axle 605 is hung down
Directly in ground surface, upper axle portion and big belt wheel 604 are affixed, and middle part and horizontal bearing and bearing block composition 606 constitute and be rotatablely connected；It is small
Belt wheel 602, belt 603 and big belt wheel 604 form belt gear；607 front end of supporter is equipped with square breach 612, rear end
There are two reinforcing ribs 611 for setting；Dowel hole 614 and internal spline there are two 605 top of short axle is equipped with flat key slot 613, lower part is set
615。
As shown in Fig. 5~Fig. 7, subsoiling device 4 includes U-bolt 401, spade connecting plate 402, spade 403, sleeve pedestal
404, shovel tip 405, second driven shaft pitch the 406, second active yoke 407, connecting shaft 408, positioning bolt 409, first driven shaft
Pitch the 410, first active yoke 411, the first cross axle 412, the second cross axle 413, card 415 and compressed spring 416；Wherein,
Spade connecting plate 402 is placed in 103 rear end supporter of rear cross beam, 607 square breach 612；403 top of spade is connected by spade
Plate 402, U-bolt 401 are fixed in 103 rear end of rear cross beam, and lower part and sleeve pedestal 404 are affixed；First active yoke, 411 top
It is affixed by spline, positioning pin and 605 lower part of short axle；First driven shaft pitches the 410, first cross axle 412, the first active yoke
411 constitute the first universal transmission mechanism；408 top regular hexagon axis of connecting shaft and first driven shaft pitch 410 lower part regular hexagons
Axis hole is affixed by positioning bolt 409, and lower part is equipped with dowel hole and internal spline, passes through spline, positioning pin and the second driving shaft
It is affixed to pitch 407 tops；Second driven shaft pitches the 406, second cross axle 413, the second active yoke 407 constitutes the second Universal drive machine
Structure；Shovel tip 405 is placed in sleeve pedestal 404 to constitute with spade 403 and be rotatablely connected；The cylindrical projection of two cards 415 passes through shovel
Two the first limit holes 417 on the axis hole 418 of sharp 405 rear portion regular hexagons, compressed spring 416 be placed in two cards 415 it
Between；The axis of 405 rear portion regular hexagon of shovel tip passes through card 415, the first limit hole 417, the second limit hole 414 and second driven shaft
The axis hole 418 for pitching 406 lower part regular hexagons is affixed.Shovel tip 405 passes through sleeve pedestal 404, and one end is exposed to outside sleeve pedestal 404,
The other end and second driven shaft fork 406 connect, sleeve pedestal 404, shovel tip 405 center line angle with horizontal plane for 25 °~
35°；For shovel tip 405 in cone, circular cone basal diameter is 40~60mm, there is thread groove and straight on 405 leading exterior surface of shovel tip
Groove；405 velocity of rotation of shovel tip preferably 100~200r/min.Spade 403 is with a thickness of 25~30mm.Second driven shaft fork 406,
Second cross axle 413, the second active yoke 407, connecting shaft 408 cylinder diameter be less than or equal to spade 403 thickness.
Operation process of the present invention is as follows: shovel tip rotation drag reduction subsoiler is articulated in rear tractor by suspension arrangement 2, and
Deep device 5 is limited according to the adjusting of subsoiling depth requirements.Tractor imparts power to gearbox 3, drives the small pulley of two sides
602, the belt wheel transmission mechanism work that belt 603 and big belt wheel 604 form, passes through short axle 605, the first active yoke 411, first
Cross axle 412, first driven shaft fork 410, connecting shaft 408, the second active yoke 407, the second cross axle 413 and second driven shaft
Two universal transmission mechanisms that fork 406 is constituted drive shovel tip 405 to rotate.When deep soil loosing shovel buries, shovel tip 405 is rotated, and increases it
The stability buried；When deep soil loosing shovel operation, the rotation of shovel tip 405 plough sole hard to deep layer and the progress of subsoil soil are loose,
Shovel tip reduces shovel tip stress from the aggregate motion that existing linear motion becomes rotation and straight line, to reduce subsoiler work
Industry resistance.If the abrasion of shovel tip 405 can not effectively work, by pressing 415 cylindrical projection of card, after pressure shovel tip 405 is dismantled more
It changes.
Claims (10)
1. a kind of shovel tip rotates drag reduction subsoiler, including rack (1), rack (1) two sides are symmetrically arranged with the deep device (5) of limit,
The frame top is connected with suspension arrangement (2), it is characterised in that: is additionally provided with gearbox (3), the speed change on the rack (1)
The power output shaft of case (3) is connect with power transmission (6), the power output shaft and subsoiling of the power transmission (6)
Device (4) connection；
The subsoiling device (4) includes shovel tip (405) and spade (403), fixes and connects with rack (1) at the top of the spade (403)
It connects, bottom is equipped with sleeve pedestal (404), and the shovel tip (405) passes through the sleeve pedestal (404), and one end is exposed to the sleeve
Pedestal (404) outside, the power output axis connection of the other end and the power transmission (6).
2. shovel tip rotates drag reduction subsoiler according to claim 1, it is characterised in that: the power transmission (6) is moved
Power output shaft includes short axle (605) and connecting shaft (408), and short axle (605) top connects the power transmission (6),
Short axle (605) bottom end connects the first universal transmission mechanism, and first universal transmission mechanism and the connecting shaft (408) are pushed up
End connection, connecting shaft (408) bottom end connect the second universal transmission mechanism, second universal transmission mechanism and the shovel tip
(405) it connects.
3. shovel tip rotates drag reduction subsoiler according to claim 2, it is characterised in that: the power transmission (6)
What is connect including the long axis (601) being fixedly connected with the power output shaft of the gearbox (3) and with the subsoiling device (4) is dynamic
Power output shaft, the long axis (601) are equipped with small pulley (602), and the short axle (605) of the power output shaft is equipped with big belt wheel
(604), vertical small pulley (602) plane of big belt wheel (604) plane, the big belt wheel (604) and the small pulley
(602) belt (603) are connected between.
4. shovel tip rotates drag reduction subsoiler according to claim 2, it is characterised in that: first universal transmission mechanism includes
First active yoke (411), the first cross axle (412) and first driven shaft fork (410), the first active yoke (411) with
The short axle (605) is fixedly connected, and the first active yoke (411) passes through first cross axle (412) and described first
Driven yoke (410) connection, the first driven shaft fork (410) are fixedly connected with the connecting shaft (408) top.
5. shovel tip rotates drag reduction subsoiler according to claim 2, it is characterised in that: second universal transmission mechanism includes
Second active yoke (407), the second cross axle (413) and second driven shaft fork (406), the second active yoke (407) with
Connecting shaft (408) bottom end is fixedly connected, and the second active yoke (407) passes through second cross axle (413) and institute
Second driven shaft fork (406) connection is stated, the second driven shaft fork (406) is detachably connected with the shovel tip (405).
6. shovel tip according to claim 1 or claim 2 rotates drag reduction subsoiler, it is characterised in that: the shovel tip (405) is in circle, institute
State shovel tip (405) circular cone basal diameter be 40~60mm, shovel tip (405) leading exterior surface be equipped with thread groove and with
The vertical straight groove of the thread groove.
7. shovel tip according to claim 1 or claim 2 rotates drag reduction subsoiler, it is characterised in that: the sleeve pedestal (404) and institute
The center line angle with horizontal plane for stating shovel tip (405) is 25 °~35 °.
8. shovel tip rotates drag reduction subsoiler according to claim 5, it is characterised in that: the second driven shaft pitches (406), institute
The cross-sectional diameter for stating the second cross axle (413), the second active yoke (407) and the connecting shaft (408) is equal≤described
The thickness of spade (403)；The spade (403) with a thickness of 25~30mm.
9. shovel tip rotates drag reduction subsoiler according to claim 5, it is characterised in that: be equipped with axis at the top of the shovel tip (405)
Hole (418) is symmetrically opened on the axis hole (418) there are two the first limit hole (417), in two first limit holes (417)
It is respectively equipped with card (415), the card (415) is equipped with cylindrical projection, and the cylindrical projection protrudes into first limit hole
(417) in, card has compressed spring (416) between two cards (415)；It is symmetrically provided on the second driven shaft fork (406)
Two the second limit holes (414), the second driven shaft fork (406) connect with the axis hole (418), and two cylinders are convex
It rises and is respectively protruding into two second limit holes (414).
10. shovel tip according to claim 1 or claim 2 rotates drag reduction subsoiler, it is characterised in that: the rack (1) is equipped with branch
Support body (607), the power transmission (6) and the subsoiling device (4) are fixedly connected with the supporter (607) respectively；
Supporter (607) front is provided with square breach (612), and bottom is equipped with reinforcing rib (611).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810974058.4A CN109104912B (en) | 2018-08-24 | 2018-08-24 | Shovel tip rotating resistance-reducing subsoiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810974058.4A CN109104912B (en) | 2018-08-24 | 2018-08-24 | Shovel tip rotating resistance-reducing subsoiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109104912A true CN109104912A (en) | 2019-01-01 |
| CN109104912B CN109104912B (en) | 2021-07-30 |
Family
ID=64860119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810974058.4A Active CN109104912B (en) | 2018-08-24 | 2018-08-24 | Shovel tip rotating resistance-reducing subsoiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109104912B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109923959A (en) * | 2019-04-12 | 2019-06-25 | 吉林大学 | A kind of dual-vibration drag reduction subsoiler |
| CN110431948A (en) * | 2019-09-18 | 2019-11-12 | 吉林农业大学 | A kind of subsoiling shovel device spraying drag reduction applied to soda alkaline land modifying agent |
| CN115486216A (en) * | 2022-10-17 | 2022-12-20 | 吉林大学 | Ball type subsoiler with soil friction state and operation resistance acquisition function |
| CN115486216B (en) * | 2022-10-17 | 2024-04-26 | 吉林大学 | Ball subsoiler with soil friction state and operation resistance acquisition function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109923959A (en) * | 2019-04-12 | 2019-06-25 | 吉林大学 | A kind of dual-vibration drag reduction subsoiler |
| CN109923959B (en) * | 2019-04-12 | 2021-10-01 | 吉林大学 | Dual-vibration drag reduction subsoiler |
| CN110431948A (en) * | 2019-09-18 | 2019-11-12 | 吉林农业大学 | A kind of subsoiling shovel device spraying drag reduction applied to soda alkaline land modifying agent |
| CN110431948B (en) * | 2019-09-18 | 2024-02-06 | 吉林农业大学 | Deep scarification shovel device applied to spray drag reduction of soda saline-alkali soil modifier |
| CN115486216A (en) * | 2022-10-17 | 2022-12-20 | 吉林大学 | Ball type subsoiler with soil friction state and operation resistance acquisition function |
| CN115486216B (en) * | 2022-10-17 | 2024-04-26 | 吉林大学 | Ball subsoiler with soil friction state and operation resistance acquisition function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109104912B (en) | 2021-07-30 |
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