CN109249542A - Air entrained concrete production equipment - Google Patents
Air entrained concrete production equipment Download PDFInfo
- Publication number
- CN109249542A CN109249542A CN201811286614.5A CN201811286614A CN109249542A CN 109249542 A CN109249542 A CN 109249542A CN 201811286614 A CN201811286614 A CN 201811286614A CN 109249542 A CN109249542 A CN 109249542A
- Authority
- CN
- China
- Prior art keywords
- cavity
- drill bit
- gear
- cross drilling
- gears
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
- B28D1/146—Tools therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work
Abstract
The present invention relates to concrete production fields, and in particular to air entrained concrete production equipment, including drill body and drill bit, drill bit are equipped with dust bag, are equipped with adapter cavity and cavity in drill bit；Annular chamber is equipped in drill bit, the tip of drill bit is equipped with several holes being connected to annular chamber；No.1 gear and No. two gears are provided in adapter cavity, the side that the gear teeth of the gear teeth of No.1 gear and No. two gears progressively disengage is into dirt chamber, the progressively engaged side of the gear teeth of the gear teeth of No.1 gear and No. two gears is dirt chamber, is connected into dirt chamber with annular chamber, dirt chamber is connected to dust bag out；Drill bit is equipped with the through-hole being connected to cavity, is equipped with cross drilling mechanism in cavity, cross drilling mechanism includes telescopic unit and cross drilling part；Telescopic unit can drive cross drilling part to stretch out from through-hole.When using the technical program, dust can be collected during being processed on air entrained concrete top plate, and secured blind hole is produced on air entrained concrete top plate.
Description
Technical field
The present invention relates to concrete production fields, and in particular to air entrained concrete production equipment.
Background technique
Air entrained concrete be using siliceous material and calcareous material as primary raw material, add foaming agent, by ingredient, stirring,
Light porous silicate product made of the technical process such as casting, precuring, cutting, steam pressure, maintenance.Because air entrained concrete has gently
The advantages that matter, waterproof, sound insulation, heat preservation, usually using air entrained concrete top plate as indoor ceiling, during finishing, it is
Convenience mounted lamp on the ceiling, it usually needs processed on air entrained concrete top plate using electric drill vertical blind
Then expansion tube is embedded in blind hole, then the strut on lamps and lanterns is fixedly mounted in expansion tube by hole.
But have a large amount of dust during carrying out blind hole machining production to air entrained concrete top plate at present and fall,
On the one hand it does not utilize construction personnel to process blind hole, while can also pollute indoor environment；And in air entrained concrete top plate
After blind hole machining has produced, the expansion tube being embedded in blind hole can only suspend lamps and lanterns in midair by the frictional force with blind hole inner wall,
The inner wall of blind hole is it is possible that cracking phenomena simultaneously, in this way for the lamps and lanterns of heavier-weight, after suspension over time
It may fall, and to appear in the time below lamps and lanterns very more by people, as one can imagine, lamps and lanterns are once fallen, caused by
Consequence is very serious.
Summary of the invention
The purpose of the present invention is to provide one kind to be collected dust during air entrained concrete top plate processes,
And the equipment of " ten " shape blind hole is produced on air entrained concrete top plate.
In order to achieve the above objectives, technical solution of the present invention provide air entrained concrete production equipment, including drill body and turn
The dynamic drill bit being set on drill body, the drill bit are equipped with dust bag, are equipped with adapter cavity and cavity in the drill bit；The drill bit
Interior to be equipped with annular chamber, the tip of drill bit is equipped with several holes being connected to annular chamber；Intermeshing is provided in the adapter cavity
No.1 gear and No. two gears, there are gap, No.1 gears between the cavity wall of adapter cavity for No.1 gear and No. two gears
The gear teeth and No. two gears the side that progressively disengages of the gear teeth be into dirt chamber, the gear teeth of the gear teeth of No.1 gear and No. two gears by
The side gradually engaged is dirt chamber, described to be connected into dirt chamber with annular chamber, and the dirt chamber out is connected to dust bag；On the drill bit
Equipped with the through-hole being connected to cavity, cross drilling mechanism is equipped in the cavity, the cross drilling mechanism includes telescopic unit
With cross drilling part；When No.1 gear rotates, the telescopic unit can drive cross drilling part to stretch out from through-hole.
This programme is had the technical effect that in the process for being carried out vertical blind hole machining production to concrete roof using drill bit
In, the dust of generation enters in annular chamber through hole, after drill bit completes the vertical blind hole machining of certain depth, makes in adapter cavity
The rotation of No.1 gear, to drive the rotation of No. two gears, into dirt chamber volume because No.1 gear the gear teeth and No. two gears
The gear teeth progressively disengage and increase, generate certain vacuum degree into dirt is intracavitary, i.e., form pressure difference between dirt chamber and annular chamber,
So the dust in annular chamber be constantly inhaled under this pressure difference it is intracavitary into dirt, and through gap enter dirt it is intracavitary；Dirt chamber out
Volume because the gear teeth of No.1 gear and the gear teeth of No. two gears are progressively engaged and reduce, to increase out the intracavitary pressure of dirt
Power, and then the intracavitary dust of dirt out is sent in dust bag and is collected.When No.1 gear rotates and drives No. two gear rotations,
Telescopic unit drives cross drilling part to stretch out from through-hole, and the processing of lateral blind hole is carried out to concrete roof, is finally existed
Firm " ten " shape blind hole is formed in concrete roof；After in expansion tube insertion blind hole, expansion tube is not only by vertical blind hole
The frictional force of inner wall also suffers from the support force of lateral blind hole, so that it is guaranteed that lamps and lanterns are steadily suspended on concrete roof.
Further, the telescopic unit includes expansion plate, rotating block and No.1 shaft, and the rotating block is turned by No.1
Axis is fixedly and coaxially connected with No.1 gear, and one end of expansion plate is hingedly set in cavity, and strip-shaped hole is provided on expansion plate, is stretched
The other end of contracting plate and cross drilling part are hinged；Bias is fixedly connected with poke rod on the rotating block, and the poke rod passes through
Strip-shaped hole.When having the technical effect that the rotation of No.1 gear of this programme drives rotating block rotation by No.1 shaft, to pass through
Poke rod on rotating block drives expansion plate to swing, when expansion plate drives cross drilling part to stretch out from through-hole, cross drilling
Part carries out the processing of lateral blind hole to concrete roof；When expansion plate drives cross drilling part to bounce back to cavity from through-hole
Afterwards, slowly drill bit is pushed to continue feeding drilling convenient for artificial；When expansion plate drives cross drilling part to stretch out from through-hole again,
Cross drilling part continues the processing that lateral blind hole is carried out to concrete roof on the basis of upper primary institute's processing blind hole.
It further, further include partition, No. two shafts and cam, cavity is divided into the first cavity and the second sky by the partition
Chamber, the telescopic unit is located in the first cavity, and the first cavity is connected to dust bag, and one end of expansion plate and partition are hinged；
The cam is fixedly and coaxially connected by No. two shafts and No. two gears, and cam is located in the second cavity, and cam energy and partition
Contact.Having the technical effect that for this programme enters in dust bag after the dust generated in boring procedure enters the first cavity from through-hole
It is collected, while during second gear band moving cam rotation, cam taps support plate, convenient for making to be deposited on branch
Dust on fagging enters in dust bag.
It further, further include support plate, spring and pressing plate, the support plate is fixedly connected on drill bit, the collection
Dirt bag is located in support plate；The pressing plate is slideably positioned on drill bit, and pressing plate is connected with support plate by spring.We
Case has the technical effect that when cross drilling part carries out the processing of lateral blind hole to concrete roof, pressing plate and coagulation
Native top plate contact, it is ensured that the stability of drill bit, after cross drilling part bounces back to the first cavity from through-hole, convenient for artificial slow
Steadily drill bit is pushed to continue to drill.
Further, metal tube is fixedly installed in the through-hole.This programme has the technical effect that cross drilling part from logical
It may be stuck in annular chamber during being stretched out in hole, and it is not in this problem that cross drilling part is stretched out from metal tube.
Further, the cross drilling part is cross drilling bar, and the free end of the cross drilling bar is in coniform.This
Scheme has the technical effect that convenient for cross drilling bar to be inserted into concrete roof, while cross drilling bar is in concrete roof
Suffered resistance is small during interior rotation, it is ensured that the smooth processing of lateral blind hole.
Detailed description of the invention
Fig. 1 is the positive semi-cutaway of the embodiment of the present invention；
Fig. 2 is the backsight semi-cutaway of Fig. 1；
Fig. 3 is the semi-cutaway that cross drilling bar stretches out metal tube；
The A-A that Fig. 4 is Fig. 1 is to half sectional view (omit pressing plate)；
Fig. 5 is cross-sectional view when expansion tube is embedded in concrete roof；
Fig. 6 is the cross-sectional view that expansion tube is embedded in after concrete roof.
Specific embodiment
It is further described below by specific embodiment:
Appended drawing reference in Figure of description include: drill body 1, drill bit 2, stepper motor 3, servo motor 4, No.1 switch 5,
No. two switches 6, support plate 7, dust bag 8, pressing plate 9, annular chamber 10, hole 11, No.1 gear 12, No. two gears 13, No.1
14, No. two shafts 15 of shaft, gap 16, into dirt chamber 17, go out dirt chamber 18, the channel 20 of No.1 channel 19, two, partition 21, first
Cavity 22, the second cavity 23, cam 24,25, No. three channels 26 of metal tube, rotating block 27, expansion plate 28, cross drilling bar 29,
Poke rod 30, " ten " shape blind hole 31, expansion tube 32, support bar 33.
Embodiment is substantially as shown in figures 1-6: the air entrained concrete production equipment as shown in Fig. 1,2,4, including 1 He of drill body
Drill bit 2, drill body 1 include handle, are equipped with stepper motor 3 in drill body 1, are equipped with servo motor 4 in drill bit 2, on drill body 1 side by side
No.1 switch 5 and No. two switches 6 are installed, No.1 switch 5 is used to control the starting and closing of stepper motor 3, and No. two switches 6 are used
In the starting and closing of control servo motor 4.
As shown in Figure 1, 2, it is welded with support plate 7 on drill bit 2, dust bag 8 is placed in support plate 7, while is sliding on drill bit 2
Dynamic to be provided with pressing plate 9, pressing plate 9 is connected with support plate 7 by spring.Annular chamber 10, the tip of drill bit 2 are provided in drill bit 2
It is provided with several holes 11 being connected to annular chamber 10.
As shown in figure 4, being provided with adapter cavity and cavity in drill bit 2.As shown in Figure 1, being provided in adapter cavity intermeshing
No.1 gear 12 and No. two gears 13, coaxial welding has No.1 shaft 14 on No.1 gear 12, and No.1 gear 12 passes through No.1 and turns
The output shaft coaxial welding of axis 14 and servo motor 4 as shown in Figure 4；It is also shown in FIG. 1, coaxial welding on No. two gears 13
There are No. two shafts 15, No. two shafts 15 are rotatably dispose in drill bit 2.
As shown in Figure 1, there are gap 16, No.1 teeth between the cavity wall of adapter cavity for No.1 gear 12 and No. two gears 13
The side (i.e. the left side of adapter cavity) that the gear teeth of wheel 12 and the gear teeth of No. two gears 13 progressively disengage is into dirt chamber 17, No.1 gear
The progressively engaged side of the gear teeth of 12 gear teeth and No. two gears 13 (i.e. the right side of adapter cavity) is dirt chamber 18；Into dirt chamber 17 with
Annular chamber 10 is connected to by No.1 channel 19, and dirt chamber 18 is connected to dust bag 8 by No. two channels 20 out.
As shown in Fig. 2, being welded with partition 21 in the middle part of cavity, cavity is divided into the first cavity 22 of top under by partition 21
Second cavity 23 of side, cam 24 is provided in the second cavity 23, and cam 24 is coaxial by No. two shafts 15 and No. two gears 13
It is fixedly connected, cam 24 can tap partition 21 during rotating.It is provided with the through-hole being connected to the first cavity 22 on drill bit 2, leads to
Metal tube 25 is fixedly installed in hole, the first cavity 22 is connected to by No. three channels 26 with No. two channels 20.In first cavity 22
It is additionally provided with cross drilling mechanism, cross drilling mechanism includes rotating block 27, expansion plate 28 and cross drilling bar 29, expansion plate 28
Lower end it is hinged by pin shaft and partition 21, strip-shaped hole, the upper end of expansion plate 28 and cross drilling bar 29 are provided on expansion plate 28
Right end it is hinged, the left end of cross drilling bar 29 is in coniform.Rotating block 27 is coaxial by No.1 shaft 14 and No.1 gear 12
It is fixedly connected, bias is fixedly welded with poke rod 30 on rotating block 27, and poke rod 30 is passed through from strip-shaped hole.
Specific implementation process is as follows:
When carrying out blind hole machining to concrete roof, No.1 switch 5 as shown in Figure 1 is opened manually and starts stepper motor
After 3, the output shaft rotation of stepper motor 3 drives drill bit 2 to rotate, and drill bit 2 manually pushes drill body 1 and drill bit 2 during rotating
It moves up, to process vertical blind hole on concrete roof；The dust generated during processing vertical blind hole
Enter in annular chamber 10 through hole 11.
After drill bit 2 completes the vertical blind hole machining of certain depth, pressing plate 9 is contacted with concrete roof, then manually
It opens No. two switches 6 as shown in Figure 2 and starts servo motor 4 as shown in Figure 4, what the output shaft of servo motor 4 rotated forward
It drives No.1 shaft 14 to rotate forward in the process, so that No.1 gear 12 as shown in Figure 1 be driven to rotate clockwise, and then drives
No. two gears 13 rotate counterclockwise.
Volume into dirt chamber 17 progressively disengages because of the gear teeth of No.1 gear 12 and the gear teeth of No. two gears 13 and is increased, into
Certain vacuum degree is generated in dirt chamber 17, i.e., pressure difference is formed between dirt chamber 17 and annular chamber 10, so in annular chamber 10
Dust constantly enters from No.1 channel 19 into dirt chamber 17 under this pressure difference, and enters in dirt chamber 18 through gap 16；Dirt out
The volume of chamber 18 reduces because the gear teeth of No.1 gear 12 and the gear teeth of No. two gears 13 are progressively engaged, to increase out dirt
Pressure in chamber 18, and then the dust in dirt chamber 18 out is sent in dust bag 8 through No. two channels 20 and is collected.
When No.1 gear 12 in Fig. 1 rotates clockwise and No. two gears 13 is driven to rotate counterclockwise, pass through No.1 shaft
14 drive rotating block 27 as shown in Figure 2 to rotate counterclockwise, to drive expansion plate 28 by the poke rod 30 on rotating block 27
It swings to the left, and then cross drilling bar 29 is driven to extend out to state as shown in Figure 3 from metal tube 25；In cross drilling part from gold
Belong to during being stretched out in pipe 25, cross drilling bar 29 is rotated with drill bit 2, and the processing of lateral blind hole is carried out to concrete roof
Production.It is artificial slow after expansion plate 28 drives cross drilling bar 29 to bounce back to the first cavity 22 from metal (as shown in Figure 2)
Drill bit 2 is pushed to continue up feeding drilling；It is horizontal when expansion plate 28 drives cross drilling bar 29 to stretch out from metal tube 25 again
Continue the processing that lateral blind hole is carried out to concrete roof on the basis of upper primary institute's processing blind hole to boring bar 29, most
" ten " shape blind hole 31 as shown in Figure 5 is produced in concrete roof eventually, i.e. " ten " shape blind hole 31 includes lateral blind hole and erects
To blind hole.
" ten " shape blind hole 31 in concrete roof after processing is completed manually withdraws from drill bit 2 from vertical blind hole.
Then manually expansion tube 32 (is provided with groove, groove is interior to be provided with support by pin-hinges in the left and right sidewall of expansion tube 32
Item 33 is equipped with torsional spring on pin) be upwardly into " ten " shape blind hole 31 after, support bar 33 resets under the action of torsional spring, then to
Lower pulling expansion tube 32 is moved to position as shown in Figure 6, completes the installation of expansion tube 32；In such cases, expansion tube 32 is not only
By the frictional force of vertical blind hole inner wall, the support force of lateral blind hole is also suffered from, the installation of expansion tube 32 can be highly stable.
Claims (6)
1. air entrained concrete production equipment, including drill body and the drill bit being rotatably dispose on drill body, it is characterised in that: the brill
Head is equipped with dust bag, is equipped with adapter cavity and cavity in the drill bit；Annular chamber is equipped in the drill bit, the tip of drill bit is equipped with
Several holes being connected to annular chamber；Intermeshing No.1 gear and No. two gears, No.1 tooth are provided in the adapter cavity
There are gap between the cavity wall of adapter cavity, the gear teeth of the gear teeth of No.1 gear and No. two gears gradually take off for wheel and No. two gears
From side be into dirt chamber, the progressively engaged side of the gear teeth of the gear teeth of No.1 gear and No. two gears is dirt chamber, it is described into
Dirt chamber is connected to annular chamber, and the dirt chamber out is connected to dust bag；The drill bit is equipped with the through-hole being connected to cavity, the sky
Intracavitary to be equipped with cross drilling mechanism, the cross drilling mechanism includes telescopic unit and cross drilling part；When No.1 gear rotates,
The telescopic unit can drive cross drilling part to stretch out from through-hole.
2. air entrained concrete production equipment according to claim 1, it is characterised in that: the telescopic unit includes flexible
Plate, rotating block and No.1 shaft, the rotating block are fixedly and coaxially connected by No.1 shaft and No.1 gear, one end of expansion plate
It is hingedly set in cavity, and is provided with strip-shaped hole on expansion plate, the other end and cross drilling part of expansion plate are hinged；The rotation
Bias is fixedly connected with poke rod on block, and the poke rod passes through strip-shaped hole.
3. air entrained concrete production equipment according to claim 2, it is characterised in that: further include partition, No. two shafts and
Cavity is divided into the first cavity and the second cavity by cam, the partition, and the telescopic unit is located in the first cavity, and first is empty
Chamber is connected to dust bag, and one end of expansion plate and partition are hinged；The cam is coaxially fixed by No. two shafts with No. two gears
Connection, cam is located in the second cavity, and cam energy and baffle contacts.
4. air entrained concrete production equipment according to claim 3, it is characterised in that: further include support plate, spring and by
Pressing plate, the support plate are fixedly connected on drill bit, and the dust bag is located in support plate；The pressing plate is slideably positioned in brill
On head, and pressing plate is connected with support plate by spring.
5. air entrained concrete production equipment according to claim 4, it is characterised in that: be fixedly installed with gold in the through-hole
Belong to pipe.
6. air entrained concrete production equipment according to claim 5, it is characterised in that: the cross drilling part is laterally to bore
Vent stem, the free end of the cross drilling bar is in coniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811286614.5A CN109249542A (en) | 2018-10-31 | 2018-10-31 | Air entrained concrete production equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811286614.5A CN109249542A (en) | 2018-10-31 | 2018-10-31 | Air entrained concrete production equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109249542A true CN109249542A (en) | 2019-01-22 |
Family
ID=65044452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811286614.5A Pending CN109249542A (en) | 2018-10-31 | 2018-10-31 | Air entrained concrete production equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109249542A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2928555A1 (en) * | 1979-07-14 | 1981-01-29 | Stumpp & Kurz | DRILLING TOOL |
| CN85106996A (en) * | 1984-12-31 | 1986-07-09 | 萨基斯有限公司 | The Method and kit in a kind of boring cave particularly is used in boring hole on concrete, plaster or the similar wall |
| EP0370204A1 (en) * | 1988-11-24 | 1990-05-30 | fischerwerke Artur Fischer GmbH & Co. KG | Drilling device for producing a drilled hole with a recess |
| JPH05263575A (en) * | 1992-03-19 | 1993-10-12 | Yunika Kk | Hole bottom diameter-enlarging tool |
| CN1931550A (en) * | 2006-10-11 | 2007-03-21 | 赖其淡 | Drilling bit with both drilling and reaming function |
| CN2915333Y (en) * | 2006-06-28 | 2007-06-27 | 沈阳飞机工业（集团）有限公司 | Automatic dust-collecting air drill |
| CN101699020A (en) * | 2009-10-23 | 2010-04-28 | 上海尔速机械设备有限公司 | Rotary underreamer |
| CN102747959A (en) * | 2012-07-12 | 2012-10-24 | 赵群燕 | Method for fixing object and expansion bolt and special borer for method |
| CN203695578U (en) * | 2014-01-24 | 2014-07-09 | 张峰 | Synchronous auxiliary dust collecting device of electric drill |
| CN203978343U (en) * | 2014-08-14 | 2014-12-03 | 淮南矿业(集团)有限责任公司 | The simple and easy drilling hole dust collector device that drilling construction is used |
| CN206693920U (en) * | 2017-03-30 | 2017-12-01 | 河南理工大学 | Expansive bit for coal bed drilling |
-
2018
- 2018-10-31 CN CN201811286614.5A patent/CN109249542A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2928555A1 (en) * | 1979-07-14 | 1981-01-29 | Stumpp & Kurz | DRILLING TOOL |
| CN85106996A (en) * | 1984-12-31 | 1986-07-09 | 萨基斯有限公司 | The Method and kit in a kind of boring cave particularly is used in boring hole on concrete, plaster or the similar wall |
| EP0370204A1 (en) * | 1988-11-24 | 1990-05-30 | fischerwerke Artur Fischer GmbH & Co. KG | Drilling device for producing a drilled hole with a recess |
| JPH05263575A (en) * | 1992-03-19 | 1993-10-12 | Yunika Kk | Hole bottom diameter-enlarging tool |
| CN2915333Y (en) * | 2006-06-28 | 2007-06-27 | 沈阳飞机工业（集团）有限公司 | Automatic dust-collecting air drill |
| CN1931550A (en) * | 2006-10-11 | 2007-03-21 | 赖其淡 | Drilling bit with both drilling and reaming function |
| CN101699020A (en) * | 2009-10-23 | 2010-04-28 | 上海尔速机械设备有限公司 | Rotary underreamer |
| CN102747959A (en) * | 2012-07-12 | 2012-10-24 | 赵群燕 | Method for fixing object and expansion bolt and special borer for method |
| CN203695578U (en) * | 2014-01-24 | 2014-07-09 | 张峰 | Synchronous auxiliary dust collecting device of electric drill |
| CN203978343U (en) * | 2014-08-14 | 2014-12-03 | 淮南矿业(集团)有限责任公司 | The simple and easy drilling hole dust collector device that drilling construction is used |
| CN206693920U (en) * | 2017-03-30 | 2017-12-01 | 河南理工大学 | Expansive bit for coal bed drilling |
Non-Patent Citations (1)
| Title |
|---|
| 谢亚青: "《液压与气压传动》", 28 February 2017, 华中科技大学出版社 * |
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Application publication date: 20190122 |