CN107127275B - A kind of automatic string wrapping machine - Google Patents
A kind of automatic string wrapping machine Download PDFInfo
- Publication number
- CN107127275B CN107127275B CN201710446918.2A CN201710446918A CN107127275B CN 107127275 B CN107127275 B CN 107127275B CN 201710446918 A CN201710446918 A CN 201710446918A CN 107127275 B CN107127275 B CN 107127275B
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- Prior art keywords
- string
- motor
- rotating motor
- wrapping
- wrapping machine
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/02—Coiling wire into particular forms helically
- B21F3/04—Coiling wire into particular forms helically externally on a mandrel or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F9/00—Straining wire
- B21F9/002—Straining wire to maintain tension in the wire, e.g. to pull the wire taut
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
- G10D3/00—Details of, or accessories for, stringed musical instruments, e.g. slide-bars
- G10D3/10—Strings
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- General Physics & Mathematics (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
A kind of automatic string wrapping machine provided by the invention, including rack, feed rod, translation motor, left-handed rotating motor, dextrorotation rotating motor, translation platform, air pressure adjustment unit, cylinder, motor cabinet, tension sensor, controller；When carrying out wrapping wire, left and right rotating electric machine drives string to be processed at the uniform velocity to rotate, meanwhile, translation platform drives wrapping wire at the uniform velocity to move, and wrapping wire is equably wrapped on string to be processed；The cylinder is for adjusting position of the left-handed rotating motor on feed rod to control the axial pretension of main string；The tension sensor is for detecting around thread tension；The controller is used to control the work of string machine.The beneficial effects of the present invention are: a kind of string provided by the invention winds function real-time detection and adjusts the axial pretension around thread tension and main string of coiling, to ensure that the uniform tension in order of string in process, and then the quality of product is improved, simplify operating procedure.
Description
Technical field
The present invention relates to string wrapping machine fields, and in particular to a kind of automatic string wrapping machine.
Background technique
String, such as the string of Chinese lute or violin generally comprise the main wrapping wire 40 string 30 and be wrapped in outside main string.Qin
String generally requires in production and fixes main 30 both ends tensioning of string to form certain axial pretension, then by 40 edge of wrapping wire
The length direction of main string is wrapped in outside it.As needed, wrapping wire may be needed by different types of silk thread (metal and/or non-
Metal) it is formed after the winding working procedure of multi-pass.When winding, the both ends fixing piece by rotating main string makes it with certain speed
Wrapping wire, is then wound into the outside of main string by rotation.When wrapping wire is wound on main string, there can be certain tension (referred to as wrapping wire
Tension).Practice have shown that reasonably controlling the axial pretension of main string and around thread tension, in particular about thread tension for high-quality
It is vital for string；If in process, be unable to control around thread tension, it is difficult to produce line footpath consistent
String, to can not just produce the string of high-quality.As shown in Figure 1, the schematic diagram of main string winding wrapping wire, figure is shown
Middle X is the axial pretension of main string, and Y is around thread tension.
The revolving speed of main string is the clutch for stepping on pedal by worker to adjust clutch motor when traditional string wrapping machine work
It is obtained in this way with the speed for obtaining needs however, the position of clutch-plate will change due to the movement of human body the position of piece
The rotary speed unstabilization of the clutch motor obtained is fixed.And when existing equipment produces string, pretension is non-adjustable, and piano wire is installed
When machine, pretension has been fixed, and the axial pretension of main string and is all manually adjusted around thread tension, and different worker or
The tension that the same worker installs piano wire in different times all can be inconsistent, the quality (namely consistency) of such string
It cannot guarantee.
In addition, the revolving speed of the clutch motor of traditional string wrapping machine is 1440 revs/min, passed by belt transmission, gear
It is dynamic that speed is increased to 10000 revs/min, since running part is relative complex, cause machine vibration and noise especially big, especially
It is gear transmission section when running at high speed.The vibration and noise of equipment is very big, influences on the quality of product very big.With present
The change of string production technology, more and more urgent to the improvement of string winding machine equipment, traditional string wrapping machine cannot
Produce the string of complicated technology.
Applicant discloses a kind of air pressure adjustment identical tension frequency control in Chinese patent application 201420204882.9
Manual string machine is the position that left motor is adjusted by air pressure regulator on feed rod, and then controls the axial pre- of main string
Pulling force, but this manual string machine can not be measured in real time and control around thread tension.Therefore, when carrying out production string
It is unable to control around thread tension, to not can guarantee the consistency of product line footpath in process, high-quality can not be processed
String.
In addition, machine in the prior art can only a kind of simultaneously wound wrapping wire, be not able to satisfy simultaneously wound more wrapping wires
It is required that.If necessary on a string wind different wrapping wires, it will ceaselessly replace wrapping wire or remove string and be put into
Different wrapping wires is wound on another machine.It will lead to the complexity of operation in this way, product quality cannot be unified.Especially by string
Its pretension can disappear after removing, and can cause very big influence to the quality of product again in this way, make again if tensioning and wrapping wire
Obtain string inferior quality.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of automatic string wrapping machines.
A kind of automatic string wrapping machine of the invention, technical solution are as follows:
A kind of automatic string wrapping machine, including rack, feed rod, translation motor, left-handed rotating motor, dextrorotation rotating motor, translation
Platform, air pressure adjustment unit, cylinder and motor cabinet；Feed rod is arranged on the rack；Dextrorotation rotating motor is fixed on the right end of rack, left
Rotating electric machine is arranged on the feed rod of side by motor cabinet, and string hook is respectively connected on left-handed rotating motor and dextrorotation rotating motor
And its rotation is controlled, main string is hung on the string hook at both ends；The cylinder is for controlling position of the left-handed rotating motor on feed rod
It sets to control the axial pretension of main string, air pressure adjustment unit is used to adjust the pressure of cylinder；Rack is arranged in translation motor
Left end, translation platform are arranged on the feed rod of the other side, and the translation motor drives the translation platform to move on feed rod；Institute
It states and is provided with out wire hole, tension sensor and wire wrapping wheel on translation platform；Wrapping wire is passed by the wire wrapping wheel, the pulling force respectively
Sensor and the wire hole out are wound on main string；The diameter ratio of the wrapping wire and the main string is 0.1-5；
For the automatic string wrapping machine when carrying out wrapping wire, the both ends of main string are connected to the left-handed rotating motor and institute
It states on the string hook of dextrorotation rotating motor, the left-handed rotating motor and the dextrorotation rotating motor drive main string rotation, meanwhile, translation
Platform drives wrapping wire mobile, so that wrapping wire is wound on main string；The tension sensor is for detecting around thread tension.
A kind of automatic string wrapping machine provided by the invention can also have following attached technical characteristic:
Wherein, the wire wrapping wheel turns to be provided on the tip of the axis for adjusting the regulating device around thread tension.
Wherein, it is additionally provided with multiple pneumatic devices of support string on the feed rod, is arranged on the pneumatic device organic
Tool switch, when the translation platform is moved to the pneumatic device, the mechanical switch is triggered, and support device moves down, with
Support device and translation platform is avoided to bump against；When translation platform leaves pneumatic device, support device is restored to original position,
Keep the state of support string.
Wherein, automatic string wrapping machine is divided into upper and lower two layers, is provided with left-handed rotating motor, dextrorotation described upper and lower two layers
Rotating motor, translation motor, feed rod and translation platform.
Wherein, the air pressure adjustment unit includes three regulating valves and three pressure gauges, one of regulating valve and one
Pressure gauge is used to adjust and show the total gas pressure of the cylinder, and other two regulating valve and two pressure gauges are for adjusting and showing
The upper and lower layer operation air pressure of string wrapping machine.
Wherein, plexiglass cover is additionally provided on the outside of the string wrapping machine.
It wherein, further include the controller to work for controlling the automatic string wrapping machine, the controller is for controlling
The forward and backward movement of left and right rotating electric machine, the revolving speed moved back and forth with motor for translating platform.
Wherein, the automatic string wrapping machine further includes a foot-operated switch.
Wherein, sliding block is provided on the motor cabinet, the left-handed rotating motor is moved up by the sliding block in the feed rod
It is dynamic.
Wherein, the translation motor, left-handed rotating motor and dextrorotation rotating motor are servo motor.
Implementation of the invention includes following technical effect:
A kind of automatic string wrapping machine provided by the invention, has installed cylinder and tune additional on the basis of existing string wrapping machine
Valve is saved, in this way, the axial pretension of main string can be controlled accurately, when producing string, worker does not need to be concerned about the to be added of installation
Whether the tension of work string is consistent；And by the way that tension sensor is arranged to realize to around the real-time of thread tension on translation platform
Detection, and grasp worker around thread tension in real time to worker the data feedback of measurement, if had exceeded around thread tension
Processing range, worker can adjust pulling force at any time, to ensure that the uniform tension in order of main string and wrapping wire in process, improve
The quality of product；Also, the filament mouth on reel, pressure sensor and wire vent head is disposed as in the present invention
It is multiple, so that the automatic string wrapping machine in the present invention can twined with simultaneously wound more wrapping wires to meet some strings
Multiple winding layers must carry out the requirement of wrapping simultaneously during silk, also solve and need weight during wrapping in the prior art
It dismounts again and destroys problem caused by string, to further improve the quality of string, simplify processing technology.
Detailed description of the invention
Fig. 1 is the axial pretension of main string and the schematic diagram around thread tension.
Fig. 2 is a kind of perspective view of automatic string wrapping machine of the invention.
Fig. 3 is a kind of positive structure schematic of automatic string wrapping machine of the invention.
Fig. 4 is a kind of side structure schematic diagram of automatic string wrapping machine of the invention.
Specific embodiment
The present invention is described in detail below in conjunction with embodiment and attached drawing, it should be pointed out that described reality
It applies example and is intended merely to facilitate the understanding of the present invention, and do not play any restriction effect to it.
Referring to fig. 2 shown in -4, a kind of automatic string wrapping machine provided in this embodiment, including rack 1, feed rod 2, translation electricity
Machine 3, left-handed rotating motor 4, dextrorotation rotating motor 5, translation platform 6, air pressure adjustment unit 7, cylinder and motor cabinet 8；The setting of feed rod 2 exists
In rack 1；Dextrorotation rotating motor 5 is fixed on the right end of rack 1, and the feed rod 2 of side is arranged in by motor cabinet 8 for left-handed rotating motor 4
On, it is respectively connected with string hook 9 on left-handed rotating motor 4 and dextrorotation rotating motor 5 and controls its rotation, main string 30 hangs over the qin at both ends
On string hook 9；The cylinder is for adjusting position of the left-handed rotating motor 4 on feed rod 2 to control the axial pretension of main string, gas
Pressure adjusts the pressure that unit 7 is used to adjust cylinder；The left end of rack 1 is arranged in translation motor 3, and translation platform 6 is arranged another
On the feed rod 2 of side, the translation motor 3 drives the translation platform 6 to move on feed rod；It is provided on the translation platform 6
Wire hole 61, tension sensor 62 and wire wrapping wheel 63 out；Wrapping wire passes through the wire wrapping wheel 63, the tension sensor 62 and institute respectively
Wire hole 61 is stated out to be wound on main string 30；The diameter ratio of the wrapping wire and the main string is 0.1-5；
For the automatic string wrapping machine when carrying out wrapping wire, the both ends of main string 30 are connected to the left-handed rotating motor 4
On the string hook 9 of the dextrorotation rotating motor 5, the left-handed rotating motor 4 and the dextrorotation rotating motor 5 drive main string 30 to revolve
Turn, meanwhile, translation platform 6 drives wrapping wire mobile, so that wrapping wire is wrapped on main string 30；The tension sensor 62 detects wrapping wire
In the process around thread tension.
A kind of automatic string wrapping machine provided in this embodiment, adds gas on the basis of existing string wrapping machine
Cylinder to adjust operating position of the left-handed rotating motor 4 on feed rod 2, and then controls the axial pretension of main string 30；And by flat
It moves and tension sensor 62 is set on platform 6, and wrapping wire is bypassed into tension sensor 62, so that tension sensor 62 is to around thread tension
It is measured in real time, to ensure that the uniform tension in order of main string 30 in process, improves the quality of product.Also, by
It in the present invention, the position of left-handed rotating motor 4 and can be adjusted around thread tension, so that one kind provided by the invention
The automatic string wrapping machine scope of application is very wide.In addition, by reel 63, pressure sensor 62 and wire vent head in the present invention
On go out wire hole 61 be disposed as it is multiple so that automatic string wrapping machine in the present invention can with simultaneously wound more wrapping wires, from
And the requirement of wrapping must be carried out simultaneously by meeting some strings multiple winding layers during wrapping, also solve the prior art
In needed during wrapping repeat dismount and problem is destroyed caused by main string, to further improve the processing matter of string
Amount, and simplify processing technology.
Preferably, it is provided on 63 turns of thes tip of the axis of the wire wrapping wheel for adjusting the regulating device around thread tension,
Such as it can be bolt hole and bolt；The supporting element of stable string is additionally provided on the wire vent head 61.The present embodiment passes through
Bolt is turned to adjust the elastic of shaft, and then is adjusted around thread tension, when tension sensor 62 is detected it is too small around thread tension when,
Manually tighten bolt；When tension sensor 62 detects wrapping wire overtension, manual loose bolts, to realize to wrapping wire
Tension real-time detection and in time adjustment.
Preferably, described pneumatic as shown in figure 3, being additionally provided with multiple pneumatic devices 11 of support string on the feed rod 2
Mechanical switch is provided on device 11.When the translation platform 6 of lower layer is moved to pneumatic device 11, the mechanical switch is set
Trigger member triggering on translation platform 6, the pneumatic device 11 path shown in the dotted line move down, to avoid support dress
It sets and bumps against with the translation platform 6 of lower layer；When translation platform 6 leaves pneumatic device 11, support device is restored to original position,
Keep the state of support string；When 11 when the translation platform when upper layer being moved to pneumatic device, the mechanical switch is arranged on
The trigger member triggering on platform 6 is translated, the pneumatic device 11 path shown in the dotted line moves up, to avoid support device
Bump against with the translation platform 6 on upper layer；When translation platform 6 leaves pneumatic device 11, support device is restored to original position, protects
Hold the state of support string.The present invention by the way that multiple pneumatic devices are arranged on feed rod, so as to so that main string in Filament Winding process
It is middle to keep straight.
Preferably, string wrapping machine is divided into upper and lower two layers, is provided with left-handed rotating motor 4, right rotation electricity upper and lower two layers
Machine 5, translation motor 3, feed rod 2, translation platform 6；Wherein, the revolving speed of upper and lower two layers of left and right rotating electric machine 4,5 is identical, direction
On the contrary.The present embodiment is by the way that string wrapping machine to be divided into upper and lower two layers, and when one layer of progress automatic work, worker can be to another
One layer is operated, to improve work efficiency, has saved time cost.
Preferably, air pressure adjustment unit 7 includes three regulating valves 71 and three pressure gauges 72, one of 71 He of regulating valve
One pressure gauge 72 is used to adjust and show the total gas pressure of the cylinder, and other two regulating valve 71 and two pressure gauges 72 are used for
Adjust and show the upper and lower layer operation air pressure of string wrapping machine.The present embodiment installed additional on the basis of existing technology cylinder and
The pretension of regulating valve, such piano wire can be adjusted in advance, and when producing string, worker does not need to be concerned about installation string
To guarantee uniform tension in order when steel wire, cylinder can be with adjust automatically motor operating position.
Preferably, glass cover is additionally provided on the outside of the string wrapping machine；The glass cover is the double-deck plexiglass cover.It is logical
Crossing increase plexiglass cover can protect the safety of operator, and can reduce noise.
It preferably, further include the controller to work for controlling the automatic string wrapping machine, the controller is for controlling
The forward and backward movement of rotating electric machine processed, translation platform move back and forth with the revolving speed of motor etc..Controller is equipped with console, control
Platform processed is equipped with the operation button for carrying out various operations.The string parameter and control program of the present embodiment are set in advance, work
People only needs to select the serial number of string when operating, without being inputted every time, to improve work effect
Rate, ensure that the consistency of product, nor worker is needed to be familiar with the course of work, reduce recruitment cost.
Preferably, the automatic string wrapping machine further includes a foot-operated switch, for controlling the rotation speed of main string.This hair
It is bright by the way that a foot-operated switch is arranged, improve the convenience of worker operation.
Preferably, sliding block is provided on the motor cabinet 8, the left-handed rotating motor 4 is by the sliding block in the motor
It is slided on seat 8.
Preferably, the translation motor 3, left-handed rotating motor 4, dextrorotation rotating motor 5 are servo motor.It is flat in the application
It moves motor 3, left-handed rotating motor 4, dextrorotation rotating motor 5 and selects servo motor, revolving speed can achieve 3900 revs/min, pass through one
Grade gear belt transmission, is easily reached 8000 revs/min, and since running part greatly simplifies, makes noise and the vibration of equipment
Dynamic also to greatly reduce, the working environment of worker has very big improvement, and product quality is also improved.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered
Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (9)
1. a kind of automatic string wrapping machine, it is characterised in that: including rack, feed rod, translation motor, left-handed rotating motor, right rotation
Motor, translation platform, air pressure adjustment unit, cylinder and motor cabinet；Feed rod is arranged on the rack；Dextrorotation rotating motor is fixed on rack
Right end, left-handed rotating motor is arranged on the feed rod of side by motor cabinet, and left-handed rotating motor and dextrorotation rotating motor are respectively connected with
String is linked up with and controls its rotation；The cylinder is for adjusting position of the left-handed rotating motor on feed rod to control the axial direction of main string
Pretension, air pressure adjustment unit are used to adjust the pressure of cylinder；The left end of rack is arranged in translation motor, and translation platform setting exists
On the feed rod of the other side, the translation motor drives the translation platform to move on feed rod；It is provided on the translation platform
Multiple wire hole, multiple tension sensors and multiple wire wrapping wheels out；Wrapping wire pass through respectively the wire wrapping wheel, the tension sensor and
The wire hole out is wound on main string；The diameter ratio of the wrapping wire and the main string is 0.1-5；
For the automatic string wrapping machine when carrying out wrapping wire, the both ends of main string are connected to the left-handed rotating motor and the right side
On the string hook of rotating electric machine, the left-handed rotating motor and the dextrorotation rotating motor drive main string rotation, meanwhile, translate platform
Drive wrapping wire mobile, so that wrapping wire is wrapped on main string；In tension sensor detection Filament Winding process around thread tension.
2. a kind of automatic string wrapping machine according to claim 1, it is characterised in that: the wire wrapping wheel turns on the tip of the axis
It is provided with for adjusting the regulating device around thread tension.
3. a kind of automatic string wrapping machine according to claim 1 or 2, it is characterised in that: be additionally provided on the feed rod
The multiple pneumatic devices for supporting string are provided with mechanical switch on the pneumatic device, be moved to when the translation platform described in
When pneumatic device, the mechanical switch is triggered, and pneumatic device moves down, and bumps against to avoid pneumatic device and translation platform；When flat
When shifting platform leaves pneumatic device, pneumatic device is restored to original position, keeps the state of support string.
4. a kind of automatic string wrapping machine according to claim 1 or 2, it is characterised in that: the automatic string wrapping machine
It is divided into upper and lower two layers, is provided with left-handed rotating motor, dextrorotation rotating motor, translation motor, feed rod and translation described upper and lower two layers
Platform.
5. a kind of automatic string wrapping machine according to claim 4, it is characterised in that: the air pressure adjustment unit includes three
A regulating valve and three pressure gauges, one of regulating valve and a pressure gauge are used to adjust and show total gas of the cylinder
Pressure, other two regulating valve and two pressure gauges are used to adjust and show the upper and lower layer operation air pressure of string wrapping machine.
6. a kind of automatic string wrapping machine according to claim 1 or 2, it is characterised in that: outside the string wrapping machine
Side is additionally provided with plexiglass cover.
7. a kind of automatic string wrapping machine according to claim 1, it is characterised in that: the automatic string wrapping machine also wraps
Include foot-operated switch.
8. a kind of automatic string wrapping machine according to claim 1, it is characterised in that: be provided with cunning on the motor cabinet
Block, the left-handed rotating motor are moved on the feed rod by the sliding block.
9. a kind of automatic string wrapping machine according to claim 1 or 2, it is characterised in that: the translation motor, anticlockwise
Motor and dextrorotation rotating motor are servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446918.2A CN107127275B (en) | 2017-06-14 | 2017-06-14 | A kind of automatic string wrapping machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710446918.2A CN107127275B (en) | 2017-06-14 | 2017-06-14 | A kind of automatic string wrapping machine |
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| CN107127275A CN107127275A (en) | 2017-09-05 |
| CN107127275B true CN107127275B (en) | 2019-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710446918.2A Active CN107127275B (en) | 2017-06-14 | 2017-06-14 | A kind of automatic string wrapping machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060222B (en) * | 2018-10-18 | 2020-11-10 | 湖南城市学院 | Dulcimer string tension measuring device |
| CN112133268B (en) * | 2020-08-21 | 2022-07-15 | 广东工业大学 | String pressing mechanism and automatic playing device applied by same |
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| CN205984254U (en) * | 2016-08-26 | 2017-02-22 | 汕头市乐童乐器有限公司 | High -efficient string coiler |
| CN206811039U (en) * | 2017-06-14 | 2017-12-29 | 北京星海福音琴业有限公司 | A kind of automatic string wrapping machine |
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| US4055038A (en) * | 1976-03-01 | 1977-10-25 | D. H. Baldwin Company | Apparatus for wrapping strings for musical instruments |
| CN201004314Y (en) * | 2007-01-22 | 2008-01-09 | 广州市罗曼士乐器制造有限公司 | Automatic string winder |
| CN101231840A (en) * | 2008-02-03 | 2008-07-30 | 广州珠江钢琴集团有限公司 | Piano automatic chord wrapping machine |
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| CN203812544U (en) * | 2014-04-25 | 2014-09-03 | 北京星海福音琴业有限公司 | Air-pressure-regulated constant-tension variable-frequency-controlled manual string machine |
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| Publication number | Publication date |
|---|---|
| CN107127275A (en) | 2017-09-05 |
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