CN110107297A - It is layered fully mechanized mining Caving in Lower-slicing contracting face method - Google Patents
It is layered fully mechanized mining Caving in Lower-slicing contracting face method Download PDFInfo
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- CN110107297A CN110107297A CN201910509575.9A CN201910509575A CN110107297A CN 110107297 A CN110107297 A CN 110107297A CN 201910509575 A CN201910509575 A CN 201910509575A CN 110107297 A CN110107297 A CN 110107297A
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- face
- contracting
- fully mechanized
- tail
- mechanized coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Abstract
The embodiment of the invention discloses a kind of layering fully mechanized mining Caving in Lower-slicing contracting face methods comprising: return channel is laid between fully mechanized coal face and baked wheaten cake area boundary in face of contracting；Fully mechanized coal face and return channel in face of perforation contracting；Remove the tail-driving portion of front and rear part scratch board conveyor on fully mechanized coal face in face of contracting；The chain and chute of the contracting face of withdrawing region upper forepart scratch board conveyor and rear portion scratch board conveyor；Tail-driving portion is reinstalled on forward scraper transporter；The work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and the operation of contracting face is carried out.Lower leaf hilt type fully mechanized coal face safety contracting face after special thick hard coal higher slice fully mechanized mining can be not only solved the problems, such as using the embodiment of the present invention, guarantee the roof safety during the operation of contracting face, realize safe, the smooth contracting face of fully mechanized coal face, but also Residual coal in goaf can be greatly reduced, reduce the probability of spontaneous fire, guarantee safety in production, improves resource recovery.
Description
Technical field
The present invention relates to technical field of coal mine, and in particular to a kind of layering fully mechanized mining Caving in Lower-slicing contracting face method.
Background technique
Certain two panel overall thickness of coal bed of coal mine recombination region is 9.63-10.35m, and average thickness 10.0m, inclination angle is 1-3 °,
Buried depth is 76-106m, and coal seam Protodyakonov coefficient is about 3, and joint fissure agensis, toughness are preferable.The panel seam mining uses
Upper and lower layered mode carries out, and back production finishes in upper coal seam.
Since the panel coal seam is needed to arrange " hilt " type by architectonic influence, Caving in Lower-slicing is burnt
Working face, with reclaiming coal resource to the maximum extent, this there is the problem of carrying out contracting face to lower leaf comprehensive coal face.But mesh
Before, the specific method in hilt type comprehensive coal face contracting face is carried out not under higher slice goaf in the prior art.Therefore, how to realize
The contracting face of comprehensive coal face under Overburden gob area becomes technical problem urgently to be resolved.
Summary of the invention
In view of this, the embodiment of the present invention proposes a kind of layering fully mechanized mining Caving in Lower-slicing contracting face method, to solve
Above-mentioned technical problem.
The embodiment of the present invention proposes a kind of layering fully mechanized mining Caving in Lower-slicing contracting face method comprising: in face of contracting
Return channel is laid between fully mechanized coal face and baked wheaten cake area boundary；Fully mechanized coal face and return channel in face of perforation contracting；Remove contracting
The tail-driving portion in the tail-driving portion of fully mechanized coal face upper forepart scratch board conveyor and rear portion scratch board conveyor in front；Withdraw contracting
The chain and chute of face region upper forepart scratch board conveyor and rear portion scratch board conveyor；By tail-driving portion be reinstalled in
On the forward scraper transporter of contracting face fully mechanized coal face；The work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead,
The operation of the contracting face of progress.
Optionally, forward scraper transporter works, and face fully mechanized coal face to be contracted is pushed ahead, before carrying out the operation of contracting face,
Further include: it is spare to withdraw from end hydraulic support of the contracting face region far from face fully mechanized coal face to be contracted；It will be close to return channel just to help
The hydraulic support of side is withdrawn from；Using the hydraulic support for the predetermined quantity withdrawn from as shield support, supporting puts work face to be contracted is comprehensive
Tail trigonum between face and contracting face region.
Optionally, using the hydraulic support for the predetermined quantity withdrawn from as shield support, supporting is in face fully mechanized coal face to be contracted
After tail trigonum between the region of contracting face, further includes: continue to promote the face fully mechanized coal face to be contracted, front of adjusting the distance
The top plate of scratch board conveyor tail preset space length hangs flexible net.
Optionally, forward scraper transporter works, and face fully mechanized coal face to be contracted is pushed ahead, after carrying out the operation of contracting face,
Further include: when contracting face fully mechanized coal face is more than tail trigonum, all hydraulic bracket on the region of contracting face is withdrawn, contracting is completed
Face operation forms fully mechanized coal face behind contracting face.
Optionally, fully mechanized coal face and burning also is laid between area boundary in face of the contracting: lower leaf first withdraw auxiliary lane, under
Layering second withdraws auxiliary lane, air return way and at least three connection roadways, and the air return way passes through at least three using double lanes, double lanes
The connection of connection roadway, the return channel, lower leaf first withdraw auxiliary lane, lower leaf second is withdrawn between auxiliary lane and air return way
It is interconnected, wherein lower leaf first withdraws auxiliary lane, lower leaf second withdraws auxiliary lane, connection roadway is parallel with return channel, returns
Wind crossheading is vertical with return channel.
Optionally, when contracting face fully mechanized coal face is more than tail trigonum, all hydraulic branch on the region of contracting face is withdrawn
Frame completes the operation of contracting face, behind formation contracting face after fully mechanized coal face, further includes: the hydraulic support of fully mechanized coal face behind contracting face
When top beam front end is advanced into the first preset distance of position of center line for withdrawing auxiliary lane apart from lower leaf first, detection forward scraper fortune
Whether defeated machine tail and lower leaf first withdraw the trigonum roof condition between auxiliary lane good；If roof condition is good, tear open
Unload the tail-driving portion of forward scraper transporter；It, will be apart from tail most along the direction of forward scraper transporter tail to head
The intermediate hydraulic support of close predetermined quantity is changed to end hydraulic support；The tail-driving portion of disassembly is reinstalled in front
On scratch board conveyor.
It optionally, include: when rear portion is scraped after the tail-driving portion of disassembly being reinstalled on forward scraper transporter
When the alignment lower leaf first of plate transporter tail withdraws auxiliary lane, is withdrawn in auxiliary lane in lower leaf first and be mounted on tail-driving portion
On the scratch board conveyor of rear portion.
Optionally, the working face and after burning and laying return channel between area boundary in face of the contracting, further includes: determine wait contract
It whether there is higher slice tunnel above the fully mechanized coal face of face；It if it exists, will fully mechanized coal face top plate in face be contracted and higher slice tunnel
The coal column and higher slice back of two sides connect.
Optionally, the tunnel that withdraws is located at below the coal column of higher slice.
Optionally, forward scraper transporter works, and face fully mechanized coal face to be contracted is pushed ahead, before carrying out the operation of contracting face,
Further include: coal seam and top plate to contracting face region reinforce in advance.
Layering fully mechanized mining Caving in Lower-slicing contracting face method provided in an embodiment of the present invention is put by first comprehensive in face of contracting
Return channel is laid on working face and baked wheaten cake area boundary, then fully mechanized coal face and return channel in face of perforation contracting, then dismantles front and back
Scratch board conveyor and front and back scratch board conveyor is moved on face fully mechanized coal face to be contracted reassembles, and carries out the operation of contracting face, not only
It can rationally determine contracting face operation technique, solve lower leaf hilt type fully mechanized coal face safety contracting face after special thick hard coal higher slice fully mechanized mining
The problem of, guarantee the roof safety during the operation of contracting face, realizes safe, the smooth contracting face of fully mechanized coal face, but also can be significantly
Residual coal in goaf is reduced, the probability of spontaneous fire is reduced, guarantees safety in production, improves resource recovery.
Detailed description of the invention
Fig. 1 is the flow chart of the layering fully mechanized mining Caving in Lower-slicing contracting face method of the embodiment of the present invention.
Fig. 2 is that the lower leaf of the embodiment of the present invention waits for contracting face fully mechanized coal face contracting face roadway layout schematic diagram.
Fig. 3 is the structural schematic diagram of fully mechanized coal face and return channel perforation in face of the contracting of the embodiment of the present invention.
Fig. 4 is the scratch board conveyor equipment for withdrawing away contracting face region of the embodiment of the present invention and fitting machine tail driving portion again
Structural schematic diagram.
Fig. 5 be the embodiment of the present invention the hydraulic support for withdrawing away contracting face region after lower leaf wait for contracting face fully mechanized coal face after
The continuous structural schematic diagram promoted.
Fig. 6 is the structural schematic diagram of the middle frame replacement end hydraulic support of the embodiment of the present invention.
Fig. 7 is the structural schematic diagram of the rear portion scratch board conveyor installation tail driving portion of the embodiment of the present invention.
Fig. 8 be the embodiment of the present invention lower leaf contracting face after fully-mechanized mining working roof timbering schematic diagram.
Specific embodiment
Below in conjunction with attached drawing and specific embodiment, technical solution of the present invention is described in detail.It is wherein identical
Components are presented with like reference characters.It should be noted that word "front", "rear" used in the following description, " left side ",
" right side ", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" are referred respectively to towards or away from particular elements
The direction of geometric center.
Fig. 1 shows the flow chart of the layering fully mechanized mining Caving in Lower-slicing contracting face method of the embodiment of the present invention, such as Fig. 1
It is shown, a kind of layering fully mechanized mining Caving in Lower-slicing contracting face provided in an embodiment of the present invention method comprising:
S100 lays return channel between fully mechanized coal face and baked wheaten cake area boundary in face of contracting；
Super high seam (thickness is greater than 8m), using layering fully mechanized mining.After higher slice fully mechanized mining, goaf is formed.Lower leaf is being opened
It is goaf above fully mechanized coal face when adopting.
As shown in Fig. 2, also laying between fully mechanized coal face and baked wheaten cake area boundary in face of contracting: lower leaf first withdraws auxiliary lane
11, lower leaf second withdraws auxiliary lane 12, air return way 13 and at least three connection roadways 14.
The air return way 13 is connected to using double lanes, double lanes by least three connection roadways 14, and the lower leaf withdraws logical
Road 10, lower leaf first withdraw auxiliary lane 11, lower leaf second withdraws and is interconnected between auxiliary lane 12 and air return way.Wherein, under
Layering first withdraws auxiliary lane 11, lower leaf second withdraws auxiliary lane 12, connection roadway 14 is parallel with return channel, air return way 13 with
Return channel is vertical.
In figure 2 the lower the lower leaf air return way in face of layering contracting above working face after return channel with behind contracting face under
It is layered air return way connection.Wherein, lower leaf air return way only has one with lower leaf air return way behind contracting face.That is, return air
Crossheading is locally using double lanes.
S200 penetrates through fully mechanized coal face and return channel in face of contracting；
Fully mechanized coal face and return channel high quality penetrate through in face of lower leaf contracting, guarantee that roof and floor perforation is smooth, for contracting face
Operation provides condition.After perforation, the operation of contracting face can be carried out.
S300 removes the tail-driving portion of fully mechanized coal face upper forepart scratch board conveyor and rear portion scratch board conveyor in face of contracting
Tail-driving portion；
S400 withdraws the chain and chute of contracting face region upper forepart scratch board conveyor and rear portion scratch board conveyor；
Wherein, it is wide to be equal to fully mechanized coal face in face of contracting for the sum of the width in contracting face region and the width of face fully mechanized coal face to be contracted
Degree.Wherein width direction is perpendicular to advance of the face direction.
Tail-driving portion is reinstalled on the forward scraper transporter of face fully mechanized coal face to be contracted by S500；
Tail-driving portion is mounted on forward scraper transporter, so that forward scraper cargo carrier is for operating condition.
S600, the work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and the operation of contracting face is carried out.
Layering fully mechanized mining Caving in Lower-slicing contracting face method provided in an embodiment of the present invention is put by first comprehensive in face of contracting
Return channel is laid on working face and baked wheaten cake area boundary, then fully mechanized coal face and return channel in face of perforation contracting, then dismantles front and back
Scratch board conveyor and front and back scratch board conveyor is moved on face fully mechanized coal face to be contracted reassembles, and carries out the operation of contracting face, not only
It can rationally determine contracting face operation technique, solve lower leaf hilt type fully mechanized coal face safety contracting face after special thick hard coal higher slice fully mechanized mining
The problem of, guarantee the roof safety during the operation of contracting face, realizes safe, the smooth contracting face of fully mechanized coal face, but also can be significantly
Residual coal in goaf is reduced, the probability of spontaneous fire is reduced, guarantees safety in production, improves resource recovery.
Further, S600, the work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and contracting face work is carried out
Industry, before further include:
It is spare to withdraw from end hydraulic support of the contracting face region far from face fully mechanized coal face to be contracted by S520；
As shown in Figure 3-4, contracting face region waits for being provided with five frame end heads on one end of contracting face fully mechanized coal face far from lower leaf
Hydraulic support is removed, and is placed on spare in chamber.End hydraulic support is withdrawn from, and provides space for withdrawing for racking.
S540 will be close to return channel and the hydraulic support of side just helped to withdraw from；
As described in Figure 5, the hydraulic support close to the just side side of return channel 10 puts work to be comprehensive in face of lower leaf contracting in figure
Make the racking of face side.The intermediate hydraulic support (middle frame in figure) in contracting face region and the pile that side side is born close to return channel
Frame is not withdrawn temporarily.
S560, using the hydraulic support for the predetermined quantity withdrawn from as shield support, supporting face fully mechanized coal face to be contracted with
Tail trigonum between the region of contracting face.
For example, using the three frame hydraulic supports withdrawn from as shield support, supporting reinforces tail trigonum in tail trigonum
Supporting.
Preferably, supporting is in face fully mechanized coal face to be contracted using the hydraulic support for the predetermined quantity withdrawn from as shield support
Tail trigonum between the region of contracting face, later, further includes:
Continue to push ahead face fully mechanized coal face to be contracted, the top plate for forward scraper transporter tail preset space length of adjusting the distance is hung
If flexible net.
In the present invention is implemented, during pushing to adopt, 15 hydraulic support stand models of forward scraper transporter tail of adjusting the distance
Top plate in enclosing hangs flexible net, is further protected top plate, for subsequent end hydraulic support replacement and after
The installation in scratch board conveyor tail-driving portion, portion creates conditions.
Further, S600, the work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and contracting face is carried out
Operation, later further include:
S700 is more than to withdraw all on the region of contracting face behind tail trigonum when face fully mechanized coal face to be contracted is pushed ahead
Hydraulic support completes the operation of contracting face, forms fully mechanized coal face behind contracting face.
As shown in fig. 6, the middle frame in contracting face region is all withdrawn, so far, the operation of contracting face is completed, is formed and comprehensive behind contracting face put work
Make face.
Optionally, S700 is more than to withdraw contracting face region behind tail trigonum when face fully mechanized coal face to be contracted is pushed ahead
On all hydraulic bracket, complete the operation of contracting face, formed behind contracting face after fully mechanized coal face, further includes:
S710, the hydraulic support top beam front end of fully mechanized coal face, which is advanced into, behind contracting face withdraws auxiliary lane apart from lower leaf first
The first preset distance of position of center line when, detect forward scraper transporter tail and lower leaf first withdraw between auxiliary lane three
Whether angular region roof condition is good；
In the present embodiment, the first preset distance is 5-10m.Wherein, whether tail trigonum roof condition is good, work
Personnel can rule of thumb judge.
S720 dismantles the driving portion of forward scraper transporter if roof condition is good；
S730 will be in the predetermined quantity nearest apart from tail along the direction of forward scraper transporter tail to head
Between hydraulic support be changed to end hydraulic support；
Five intermediate hydraulic supports (middle frame in such as Fig. 3-6) are changed to end hydraulic support.
The tail-driving portion of disassembly is reinstalled on forward scraper transporter by S740.
By the way that intermediate hydraulic support is changed to end hydraulic support, roof timbering ability can be improved, and by tail-driving
Portion is mounted on forward scraper transporter, is allowed to work normally, and improves production efficiency.
Further, S740, after the driving portion of disassembly is reinstalled on forward scraper transporter, further includes:
S750 continues to push ahead fully mechanized coal face behind contracting face, when rear portion scratch board conveyor tail is directed at lower leaf first
When withdrawing auxiliary lane, is withdrawn in auxiliary lane in lower leaf first and tail-driving portion is mounted on the scratch board conveyor of rear portion, so that rear portion
Scratch board conveyor works normally.Since then, fully mechanized coal face can be produced normally behind contracting face.
If it is bad that forward scraper transporter tail and lower leaf first withdraw the trigonum roof condition between auxiliary lane, can
With behind contracting face fully mechanized coal face be advanced into the position that lower leaf second withdraws auxiliary lane, then the fitting machine on the scratch board conveyor of rear portion
Tail driving portion and replacement end hydraulic support.
Replacement face end support and rear portion scratch board conveyor tail-driving portion selection lower leaf first withdraw auxiliary lane or under
Layering second withdraws auxiliary lane and is replaced, and top plate trigonum is easily formed after front scrapping plate transporter tail end hydraulic support, top plate
Stability is more preferable, ensure that roof safety.
Meanwhile the double lanes in design and air return way part in the lane return channel Shuan Fu add the design of 3 connection roadways, for replacement
End hydraulic support and rear portion scratch board conveyor tail-driving portion provide more changing machine meetings, also provide more spaces
And the time, guarantee that assistant conveyance is unblocked, guarantee that equipment temporary storage space is sufficient, so that it is guaranteed that can safely, it is high-quality, fast
Speed, the replacement for efficiently completing end hydraulic support and rear portion scratch board conveyor tail-driving portion, can be realized safety in production.
Further, S100 working face and is burnt after area boundary lays return channel in face of the contracting, further includes:
It determines and whether there is higher slice tunnel above face fully mechanized coal face to be contracted；
If it exists, by the coal column and higher slice back of fully mechanized coal face top plate in face to be contracted and higher slice tunnel two sides
Connection.
As shown in figure 8, in lower leaf when contracting face fully mechanized coal face crosses higher slice tunnel, using anchor cable 20 and anchor hanging beam
21 connect fully mechanized coal face top plate in face to be contracted with the coal column of higher slice tunnel two sides and higher slice back, to increase top
The safety of plate.
In the present embodiment, the specification of anchor cable 20 is 17.8 × 8000mm of φ, and every group of anchor hanging beam two sides are constructed 3 anchors
Rope.Anchor hanging beam 21 is not less than 11# mining i beam, length 9m using specification, and the array pitch between adjacent anchor hanging beam 21 is 500~
1000mm。
Preferably, the tunnel that withdraws is located at below the coal column of higher slice, to facilitate the anchoring of top plate, guarantees top plate peace
Entirely, the generation of roof fall is prevented.
Optionally, S600, the work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and the operation of contracting face is carried out
Before, further includes:
Coal seam and top plate to contracting face region reinforce in advance.
Anchor cable can be used in reinforcing mode and Ma Lisan is reinforced, and guarantees the globality of coal column and top plate, for the operation of contracting face
Better condition is created, to be reinforced as emphasis especially proximate to the coal column of higher slice goaf side.
The lower slicing roadway in contracting face region is arranged under higher slice coal column, and is helping to implement " well " to lower slicing roadway top
Implement to infuse Ma Lisan reinforcement supporting again on the basis of shaped steel band, Anchor reinforced support, the position for crossing higher slice tunnel uses
" anchor hanging beam " strengthening supporting, roadway support general effect is good, ensure that the roof safety during contracting face.
Further, before the operation of contracting face, pressure observation is carried out in advance, is grasped water component and ground pressure strength, is passed through rule
Summarize periodic weighting, fltting speed adjusted by periodic weighting so that when fully mechanized coal face and return channel penetrate through in face of contracting and
Periodic weighting is avoided when replacement end hydraulic support and rear portion transporter tail-driving portion as far as possible, is guaranteed safe and reliable.
In order to weaken movement of roof degree, top plate emptying is avoided to generate dynamic load mine pressure, it is comprehensive in face of contracting to contracting face region to put
30m starts to be unable to Sub-Level Caving before working face and return channel penetrate through, to keep the integrality and articulated structure of top plate as far as possible.
Fully mechanized coal face and return channel are penetrated through using linked network in face of contracting, during linked network perforation, reinforce overhaul of the equipments, with
Guarantee construction quality, it is ensured that quickly propel.
More than, technical solution of the present invention is described in detail in conjunction with specific embodiments, described specific implementation
Example is used to help understand thought of the invention.The derivation that those skilled in the art make on the basis of the specific embodiment of the invention
It is also belonged within the scope of the present invention with modification.
Claims (10)
1. a kind of layering fully mechanized mining Caving in Lower-slicing contracting face method characterized by comprising
Return channel is laid between fully mechanized coal face and baked wheaten cake area boundary in face of contracting；
Fully mechanized coal face and return channel in face of perforation contracting；
The tail of the tail-driving portion of fully mechanized coal face upper forepart scratch board conveyor and rear portion scratch board conveyor in face of contracting is removed to drive
Dynamic portion；
The chain and chute of the contracting face of withdrawing region upper forepart scratch board conveyor and rear portion scratch board conveyor；
Tail-driving portion is reinstalled on the forward scraper transporter of face fully mechanized coal face to be contracted；
The work of forward scraper transporter, face fully mechanized coal face to be contracted are pushed ahead, and the operation of contracting face is carried out.
2. layering fully mechanized mining Caving in Lower-slicing contracting face method as described in claim 1, which is characterized in that forward scraper fortune
The work of defeated machine, face fully mechanized coal face to be contracted are pushed ahead, before carrying out the operation of contracting face, further includes:
End hydraulic support of the contracting face of the withdrawing from region far from face fully mechanized coal face to be contracted is spare；
Will be close to return channel is just helping the hydraulic support of side to withdraw from；
Using the hydraulic support for the predetermined quantity withdrawn from as shield support, supporting face fully mechanized coal face to be contracted and contracting face region it
Between tail trigonum.
3. layering fully mechanized mining Caving in Lower-slicing contracting face method as claimed in claim 2, which is characterized in that pre- by what is withdrawn from
The hydraulic support of fixed number amount is as shield support, tail trigonum of the supporting between face fully mechanized coal face to be contracted and contracting face region
Later, further includes:
Continue to promote the face fully mechanized coal face to be contracted, the top plate for forward scraper transporter tail preset space length of adjusting the distance hangs soft
Property net.
4. layering fully mechanized mining Caving in Lower-slicing contracting face method as claimed in claim 3, which is characterized in that forward scraper fortune
The work of defeated machine, face fully mechanized coal face to be contracted are pushed ahead, after carrying out the operation of contracting face, further includes:
When contracting face fully mechanized coal face is more than tail trigonum, all hydraulic bracket on the region of contracting face is withdrawn, contracting face is completed
Operation forms fully mechanized coal face behind contracting face.
5. layering fully mechanized mining Caving in Lower-slicing contracting face method as claimed in claim 4, which is characterized in that comprehensive in face of contracting
Put working face and burn and also lay between area boundary: lower leaf first withdraws auxiliary lane, lower leaf second withdraws auxiliary lane, air return way
At least three connection roadways, the air return way using double lanes, double lanes by least three connection roadways connections, it is described withdraw it is logical
Road, lower leaf first withdraw auxiliary lane, lower leaf second withdraws and is interconnected between auxiliary lane and air return way, wherein lower leaf the
One withdraws auxiliary lane, lower leaf second withdraws auxiliary lane, connection roadway is parallel with return channel, and air return way is vertical with return channel.
6. layering fully mechanized mining Caving in Lower-slicing contracting face method as claimed in claim 5, which is characterized in that when face to be contracted is comprehensive
When putting working face more than tail trigonum, all hydraulic bracket on the region of contracting face is withdrawn, completes the operation of contracting face, after forming contracting face
After fully mechanized coal face, further includes:
The hydraulic support top beam front end of fully mechanized coal face is advanced into the center line that auxiliary lane is withdrawn apart from lower leaf first behind contracting face
When the first preset distance of position, detects forward scraper transporter tail and lower leaf first withdraws the trigonum top plate between auxiliary lane
Whether condition is good；
If roof condition is good, the tail-driving portion of forward scraper transporter is dismantled；
Along the direction of forward scraper transporter tail to head, by the intermediate hydraulic support of the predetermined quantity nearest apart from tail
It is changed to end hydraulic support；
The tail-driving portion of disassembly is reinstalled on forward scraper transporter.
7. layering fully mechanized mining Caving in Lower-slicing contracting face method as claimed in claim 6, which is characterized in that by the machine of disassembly
Tail driving portion is reinstalled on forward scraper transporter includes: later
When scratch board conveyor tail alignment lower leaf first in rear portion withdraws auxiliary lane, withdraw in auxiliary lane in lower leaf first by tail
Driving portion is mounted on the scratch board conveyor of rear portion.
8. layering fully mechanized mining Caving in Lower-slicing as claimed in claim 1 contracting face method, which is characterized in that contracting
In front between working face and baked wheaten cake area boundary after laying return channel, further includes:
It determines and whether there is higher slice tunnel above face fully mechanized coal face to be contracted；
If it exists, the coal column and higher slice back of fully mechanized coal face top plate in face to be contracted and higher slice tunnel two sides are connected
It connects.
9. layering fully mechanized mining Caving in Lower-slicing as claimed in claim 1 contracting face method, which is characterized in that described
Tunnel is withdrawn to be located at below the coal column of higher slice.
10. layering fully mechanized mining Caving in Lower-slicing as claimed in claim 1 contracting face method, which is characterized in that preceding
The work of portion's scratch board conveyor, face fully mechanized coal face to be contracted pushes ahead, before carrying out the operation of contracting face, further includes:
Coal seam and top plate to contracting face region reinforce in advance.
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