CN107654250B - Fully mechanized mining withdrawing working face sector withdrawing method - Google Patents
Fully mechanized mining withdrawing working face sector withdrawing method Download PDFInfo
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- CN107654250B CN107654250B CN201711099462.3A CN201711099462A CN107654250B CN 107654250 B CN107654250 B CN 107654250B CN 201711099462 A CN201711099462 A CN 201711099462A CN 107654250 B CN107654250 B CN 107654250B
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- 238000005065 mining Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003245 coal Substances 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 description 25
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
- E21D23/26—Hydraulic or pneumatic control
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Abstract
The embodiment of the invention discloses a fully mechanized mining withdrawal working face sector withdrawing method, which comprises the following steps: mounting a support bracket on the sector, wherein the support bracket supports a top plate of the sector; drawing out the first hydraulic support to be withdrawn; when the first hydraulic support to be withdrawn is withdrawn, the support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate; when the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised; and when the supporting height of the supporting bracket rises to a first preset height, drawing out a second hydraulic bracket to be withdrawn. The embodiment of the invention can improve the withdrawing efficiency and save the withdrawing cost.
Description
Technical Field
The embodiment of the invention relates to the technical field of coal mining, in particular to a fully mechanized coal mining withdrawal working face sector area withdrawal method.
Background
When the hydraulic support is withdrawn from the fully mechanized mining face, the existing method is to use a shield support to maintain the top plate of the withdrawal channel of the fully mechanized mining face, and for the sector area of the withdrawal channel of the fully mechanized mining face, a single hydraulic support is matched with a pi-shaped beam frame shed, namely a 'one-beam three-column steel shed' to maintain the top plate. After a first hydraulic support to be removed close to the sector area is removed, two one-beam three-column steel sheds need to be erected at the top plate of the original position of the first hydraulic support, and then two one-beam three-column steel sheds which are farthest away from the hydraulic support to be removed in the sector area are removed, wherein the number of the one-beam three-column steel sheds is at least seven. Because the supporting mode of the one-beam three-column steel shed has the defects of large roof control area, large pressure of a top plate in a sector area, high difficulty in managing the top plate, high safety risk and the like, accidents such as sinking, top leakage, shed erection pushing and the like of the top plate with a large area are easily caused, especially on a working face with a soft top plate or a bottom plate and serious argillization, single hydraulic supports are serious in bottom drilling, the supporting strength is poor, and when the one-beam three-column steel shed is manually disassembled, collapse of the top plate is easy to occur, and the safety is poor.
And the working face that the roof is broken, the separation layer, tear the net seriously adopts the wood buttress to maintain the sector area roof, every hydraulic support of waiting to remove extracts a hydraulic support of waiting to remove, supports with groined type wood buttress after extracting the hydraulic support, and then the hydraulic support of retreating recycles, no longer retrieves to strutting the wood buttress, and it is with high costs to withdraw.
Disclosure of Invention
In view of the above, an embodiment of the present invention provides a method for withdrawing a sector of a fully mechanized coal mining withdrawal working face to solve the above technical problem.
The embodiment of the invention provides a fully mechanized mining withdrawal working face sector withdrawing method, which comprises the following steps: mounting a support bracket on the sector, wherein the support bracket supports a top plate of the sector; drawing out the first hydraulic support to be withdrawn; when the first hydraulic support to be withdrawn is withdrawn, the support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate; when the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised; when the supporting height of the supporting bracket rises to a first preset height, drawing out a second hydraulic bracket to be withdrawn; after the Nth hydraulic support to be removed is drawn out, the supporting support moves towards the direction of the top wiping plate close to the (N + 1) th hydraulic support to be removed; when the supporting bracket moves a first preset distance to the top wiping plate in the direction close to the (N + 1) th hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised; and when the supporting height of the supporting bracket rises to a first preset height, drawing out the (N + 1) th hydraulic bracket to be withdrawn, wherein N is more than or equal to 2.
Optionally, when the supporting height of the supporting bracket rises to a first predetermined height, the extracting the second hydraulic bracket to be withdrawn comprises: when the supporting height of the supporting bracket rises to a first preset height, the auxiliary frame rubs the top plate to move towards the direction close to the second hydraulic bracket to be withdrawn, wherein the auxiliary frame is arranged adjacent to the supporting bracket; when the auxiliary frame moves a second preset distance to the direction of approaching the second hydraulic support to be withdrawn, the supporting height of the auxiliary frame is raised; and when the supporting height of the auxiliary frame is raised to a second preset height, drawing out a second hydraulic support to be withdrawn.
Optionally, when the supporting height of the auxiliary frame is raised to a second predetermined height, the withdrawing the second to-be-withdrawn hydraulic support comprises: when the support height of the auxiliary frame is raised to a second preset height, the shield support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate, wherein the shield support is arranged adjacent to the auxiliary frame; when the shield support moves a third preset distance to the direction of the ceiling wiping plate close to the second hydraulic support to be withdrawn, the supporting height of the shield support is raised; and when the support height of the shield support rises to a third preset height, drawing out a second hydraulic support to be withdrawn.
Optionally, the lifting of the support bracket is controlled on the auxiliary frame, and the lifting of the auxiliary frame is controlled on the shield bracket.
Optionally, the number of the shield supports is 2-3, and the adjacent shield supports are arranged in parallel.
Optionally, after the first hydraulic support to be withdrawn is withdrawn, the supporting support moves towards the ceiling wiping plate in the direction close to the second hydraulic support to be withdrawn; when the supporting bracket moves a first preset distance to the ceiling plate in the direction close to the second hydraulic bracket to be withdrawn, the step of raising the supporting height of the supporting bracket comprises the following steps: when the first hydraulic support to be withdrawn is drawn out, the front frame of the support bracket moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate; when the front frame of the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, the supporting height of the front frame of the supporting bracket is raised to a fourth preset height; the rear frame of the supporting bracket moves towards the direction of the second hydraulic bracket to be removed to wipe the top plate; and when the rear frame of the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, raising the supporting height of the rear frame of the supporting bracket to a fifth preset height, wherein the fourth preset height and the fifth preset height are both equal to the first preset height.
Optionally, the support force of the front frame after moving is equal to the initial support force of the front frame, and the support force of the rear frame after moving is equal to the initial support force of the rear frame.
Optionally, the support force of the support bracket after the movement is equal to the initial support force of the support bracket, the support force of the auxiliary frame after the movement is equal to the initial support force of the auxiliary frame, and the support force of the shield bracket after the movement is equal to the initial support force of the shield bracket.
Optionally, the first, second and third predetermined distances are equal.
Optionally, the first hydraulic support to be withdrawn and the second hydraulic support to be withdrawn are both withdrawn by a winch.
According to the fully mechanized mining withdrawing working face sector area withdrawing method provided by the embodiment of the invention, the support bracket is arranged in the sector area, and after the hydraulic bracket to be withdrawn is drawn out, the goaf roof is supported by moving the support bracket without manually loading and unloading a beam three-column steel shed, so that the withdrawing efficiency is improved, the labor intensity of workers is reduced, the consumption of single pillars is reduced, the withdrawing cost is saved, the sector area support is mechanized, the support is safer, and a manual hydraulic control pilot adjacent frame control device is adopted, so that workers do not operate in a dangerous area, and the safety is improved.
Drawings
Fig. 1 is a flow chart of a fully mechanized mining withdrawal working face sector withdrawal method according to an embodiment of the present invention.
Figure 2 is a layout view of a sector bracket of a fully mechanized coal mining and withdrawing working face of the embodiment of the invention.
Fig. 3 is a flowchart of S105 of the fully mechanized mining face sector retracting method according to the embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an auxiliary frame of a fully mechanized mining withdrawal working face sector withdrawal method according to an embodiment of the invention.
Fig. 5 is a flowchart of S203 of the method for withdrawing a sector of a fully mechanized coal mining withdrawal working face according to the embodiment of the present invention.
Fig. 6 is a flowchart of S103 and S104 of the fully mechanized coal mining withdrawal working face sector withdrawal method according to the embodiment of the present invention.
Fig. 7 is a structural schematic diagram of a supporting bracket of the fully mechanized mining and withdrawing working face sector withdrawing method of the embodiment of the invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 shows a flowchart of a fully mechanized coal mining and withdrawing working face sector withdrawing method according to an embodiment of the present invention, and fig. 2 shows a fully mechanized coal mining and withdrawing working face sector support layout diagram according to an embodiment of the present invention, which includes:
s101, mounting a support bracket in a sector area, wherein the support bracket supports a top plate of the sector area;
the number of the supporting brackets can be set according to the supporting area of the top plate of the sector area. The supporting bracket supports the top plate of the sector area, and the supporting force of the non-moving front supporting bracket to the top plate is the initial supporting force of the supporting bracket.
S102, drawing out a first hydraulic support to be withdrawn;
all the hydraulic supports to be withdrawn are arranged between the goaf and the withdrawal channel in parallel. The first hydraulic support to be withdrawn is the support closest to the support.
S103, when the first hydraulic support to be withdrawn is withdrawn, the support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate;
and reducing the supporting height of the supporting bracket, applying an acting force to the supporting bracket, wherein the direction of the acting force is from the supporting bracket to the second hydraulic bracket to be removed, when the supporting bracket can move, the reduction of the supporting height of the supporting bracket is immediately stopped, and the moving process of the supporting bracket is the movement of the ceiling wiping plate.
S104, when the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, raising the supporting height of the supporting bracket;
the first preset distance is equal to the support width of the first hydraulic support to be retracted, and as shown in fig. 2, the support width is the support distance in the length direction of the retraction passage.
S105, when the supporting height of the supporting bracket rises to a first preset height, drawing out a second hydraulic bracket to be withdrawn;
the supporting force of the moved supporting bracket is equal to the initial supporting force of the supporting bracket, so that the supporting force of the supporting bracket before and after moving is consistent, and the top plate is supported well.
S106, after the Nth hydraulic support to be withdrawn is drawn out, enabling the supporting support to move towards the ceiling wiping plate in the direction close to the (N + 1) th hydraulic support to be withdrawn;
s107, when the supporting bracket moves a first preset distance to the top wiping plate in the direction close to the (N + 1) th hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised;
s108, when the supporting height of the supporting bracket rises to a first preset height, drawing out the (N + 1) th hydraulic bracket to be retracted, wherein N is more than or equal to 2.
And analogizing in sequence until all the hydraulic supports to be withdrawn are completely withdrawn, in the embodiment of the invention, the hydraulic supports to be withdrawn can be withdrawn by adopting a slow-speed column-withdrawing winch.
According to the fully mechanized coal mining withdrawal working face sector area withdrawal method provided by the embodiment of the invention, the support bracket is arranged in the sector area, and the goaf roof is supported by moving the support bracket after the hydraulic bracket to be withdrawn is drawn out, so that the one-beam three-column steel shed is not required to be manually assembled and disassembled, the withdrawal efficiency is improved, the labor intensity of workers is reduced, the consumption of single pillars is reduced, the withdrawal cost is saved, the sector area support is mechanized, the support is safer, and a safe working space is provided for workers and equipment.
Example two
On the basis of the first embodiment, the embodiment of the present invention is improved, and optionally, as shown in fig. 3, S105 includes:
s201, when the supporting height of the supporting bracket is increased to a first preset height, the auxiliary frame rubs the top plate to move towards the direction close to the second hydraulic bracket to be withdrawn;
the auxiliary frames are arranged adjacent to the supporting bracket, and as shown in fig. 2, the auxiliary frames are arranged side by side on one side of the supporting bracket close to the retracting channel. The auxiliary frame supports the sector top plate with the auxiliary support bracket. The supporting force of the auxiliary frame to the top plate before the auxiliary frame is not moved is the initial supporting force of the auxiliary frame.
S202, when the auxiliary frame moves a second preset distance to the direction of the second hydraulic support to be withdrawn, the supporting height of the auxiliary frame is raised;
the second preset distance is the support width of the first hydraulic support to be withdrawn.
And S203, when the supporting height of the auxiliary frame is raised to a second preset height, drawing out a second hydraulic support to be withdrawn.
The supporting force of the auxiliary frame after moving is equal to the initial supporting force of the auxiliary frame, and the supporting force of the auxiliary frame on the top plate before and after moving is guaranteed to be consistent all the time, so that the goaf top plate is well protected.
In the embodiment of the present invention, as shown in fig. 4, the auxiliary frame has the following structure:
the auxiliary frame comprises a top beam side top mechanism 25, a base side top mechanism 27 and an auxiliary frame body, wherein the auxiliary frame body is provided with a base 21, a top beam 23 and a shield beam side protection plate 22, and the base 21 and the top beam 23 are connected through the shield beam side protection plate 22.
The top beam 23 is mainly responsible for supporting a coal seam, and the top beam 23 and the shield beam side guard plate 22 assist the side top to support a top plate supported by a support bracket, so that the support bracket is prevented from deviating in the retracting work.
The roof side jacking mechanism 25 includes a roof side jacking frame and a roof side jacking mechanism jack 24. The top beam side jacking mechanism 25 is connected with the top beam 23 through a pin shaft, the top beam side jacking mechanism jack 24 is connected with the top beam side jacking frame and the top beam 23, and the movement of the top beam side jacking frame is controlled through the expansion and contraction of the top beam side jacking mechanism jack 24.
During the retracting operation of the support bracket, the top beam side top mechanism 25 can prevent the support bracket from moving and deviating due to the side inclination of the top beam.
The base side jacking mechanism 27 includes a base side jacking frame and a base side jacking mechanism jack 26. The base side jacking mechanism 27 is connected with the base 21 through a pin shaft, the base side jacking mechanism jack 26 is connected with the base side jacking frame and the base 21, and the movement of the base side jacking frame is controlled through the extension and contraction of the base side jacking mechanism jack 26. The base side top mechanism is mainly responsible for preventing the base of the support bracket from moving and deviating during the withdrawing work of the support bracket.
The working principle of the auxiliary frame is as follows: when the fan-shaped support bracket is in retraction work, the auxiliary bracket supports the coal bed through the top beam. When the support bracket carries out top wiping plate movement, the top beam of the auxiliary frame and the side protection plate of the shield beam extend out to carry out primary side jacking on the support bracket; and (4) continuing retracting the supporting bracket, starting the top beam side top mechanism and the base side top mechanism to move, and performing secondary side top on the position where the supporting bracket extends out and the auxiliary frame body cannot be laterally pushed.
The base side top frame and the top beam side top frame are controlled through the base side top mechanism jack and the top beam side top mechanism jack of the auxiliary frame, and the extending heights of the base side top frame and the top beam side top frame can be flexibly adjusted according to the offset of the supporting bracket of the sector area of the actual fully mechanized mining withdrawal working face.
According to the fully mechanized mining withdrawing working face sector area withdrawing method provided by the embodiment of the invention, the auxiliary frame is arranged, so that the top plate can be laterally jacked when the supporting bracket moves, the deformation of the top plate when the supporting bracket moves is reduced, the deviation of the supporting bracket when the supporting bracket moves is prevented, the moving efficiency of the supporting bracket is improved, and the withdrawing efficiency is further improved; and the support bracket can be controlled on the auxiliary frame, so that the operation safety of workers is improved.
EXAMPLE III
On the basis of the second embodiment, the second embodiment of the present invention is improved, and optionally, as shown in fig. 5, S203 includes:
s301, when the supporting height of the auxiliary frame is raised to a second preset height, the shield support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate;
the shield support and the auxiliary frame are arranged adjacently, and the auxiliary frame is located between the shield support and the support, as shown in fig. 2. Shield supports are also used to support the roof of the sector. The shield support can adopt a hydraulic support. The supporting force of the shield support against the roof panel before the shield support is not moved is the initial supporting force of the shield support.
S302, when the shield support moves a third preset distance to the ceiling wiping plate in the direction close to the second hydraulic support to be withdrawn, raising the support height of the shield support;
the third preset distance is also the support width of the first hydraulic support to be withdrawn.
And S303, when the support height of the shield support rises to a third preset height, drawing out a second hydraulic support to be withdrawn.
The supporting force of the shield support after moving is equal to the initial supporting force of the shield support, and the supporting force of the roof is ensured to be consistent so as to support the roof perfectly.
In fig. 2, there are three shield supports, and the shield supports move in sequence according to # 3-2-1 when moving. The number of shield supports can be set according to the width of the working surface.
According to the fully mechanized mining withdrawing working face sector area withdrawing method provided by the embodiment of the invention, the shield support is arranged, so that the support area can be increased, the deformation of the top plate when the auxiliary frame moves is reduced, the moving efficiency of the auxiliary frame is improved, and the withdrawing efficiency is further improved; and the auxiliary frame can be controlled on the shield support, so that the workers do not work in a dangerous area, and the operation safety of the workers is improved.
Example four
On the basis of the second embodiment, the embodiment of the present invention is improved, and optionally, the supporting bracket includes a front frame and a rear frame, as shown in fig. 6, the steps S130 and S140 include:
s401, after the first hydraulic support to be withdrawn is drawn out, the front frame of the support moves towards the ceiling wiping plate close to the second hydraulic support to be withdrawn;
the supporting force of the front frame to the top plate before the front frame does not move is the initial supporting force of the front frame. The supporting force of the top plate before the rear frame does not move is the initial supporting force of the rear frame
S402, when the front frame of the supporting bracket moves a first preset distance to the ceiling plate in the direction close to the second hydraulic bracket to be withdrawn, raising the supporting height of the front frame of the supporting bracket to a fourth preset height;
the supporting force of the front frame after moving is equal to the initial supporting force of the front frame, and the consistency of the supporting force of the front frame after moving on the top plate is ensured, so that the top plate is supported perfectly.
S403, moving the rear frame of the supporting bracket to the direction of the second hydraulic bracket to be withdrawn towards the ceiling wiping plate;
s404, when the rear frame of the supporting bracket moves a first preset distance to the top wiping plate in the direction close to the second hydraulic bracket to be retracted, the supporting height of the rear frame of the supporting bracket is raised to a fifth preset height.
And the supporting height of the rear frame of the supporting bracket is raised to a fifth preset height, so that the supporting force of the rear frame is equal to the initial supporting force of the rear frame, and the goaf roof is protected perfectly. And the fourth preset height and the fifth preset height are equal to the first preset height so as to ensure that the supporting heights of the supporting brackets are consistent.
As shown in fig. 7, the specific structure of the front frame and the rear frame is as follows:
the front frame comprises a front frame base 1, a front frame top beam 2 and a front frame supporting device; the rear frame comprises a rear frame base 3, a rear frame top beam 4 and a rear frame supporting device.
Wherein, the front frame base 1 is connected with the rear frame base 3 in a sliding way; the front frame top beam 2 is connected with the rear frame top beam 4 in a sliding manner; the front frame top beam 2 is fixed on the front frame base 1 through the front frame supporting device; the rear frame top beam 4 is fixed on the rear frame base 3 through the rear frame supporting device.
A rail may be provided on the rear frame base 3, and the front frame base 1 may slide along the rail. Meanwhile, the back frame top beam 4 is also provided with a track 5, and the front frame top beam 2 slides along the track 5.
The support bracket also comprises a pushing jack 6, the base end of the pushing jack 6 is fixed on the rear frame base 3, and the plunger end of the pushing jack 6 is fixed on the front frame base 1. During supporting, the front frame top beam 2 and the rear frame top beam 4 are alternately supported by the pushing jack 6.
The support bracket also comprises a control device, and the control device is connected with the pushing jack of the adjacent support bracket through a hydraulic pipeline. The control device is a manual pilot control adjacent frame control device, the support operation is that the auxiliary frame outputs a hydraulic control signal by controlling an operating handle of a manual pilot reversing valve to drive a reversing main valve to reverse, and high-pressure liquid of the system flows out from a valve core of the reversing main valve to control corresponding hydraulic jacks of the support to execute corresponding actions. The hydraulic support is controlled by the manual pilot adjacent support, so that the operation safety of operators is improved, and the operators are prevented from being injured by falling of waste rocks in the sector area. Similarly, a manual hydraulic control pilot adjacent frame control device is arranged on a No. 3 shield support to control the auxiliary frame to work, a manual hydraulic control pilot adjacent frame control device is arranged on a No. 2 shield support to control the No. 3 shield support to work, and a manual hydraulic control pilot adjacent frame control device is arranged on a No. 1 shield support to control the No. 2 shield support to work. And the 1# shield support can be controlled to work on the 1# shield support due to the longer distance between the 1# shield support and the goaf.
The front frame supporting device comprises a first upright post 7, a second upright post 8 and a front frame shielding beam 9; the bottom of first stand 7, second stand 8 and front frame shield roof beam 9 all is fixed on front frame base 1, and the top of first stand 7, second stand 8 and front frame shield roof beam 9 all is connected with front frame roof beam 2 rotation.
Preferably, the first upright 7 and the second upright 8 are both made of telescopic sleeves, and the front frame shield beam 9 is fixedly connected with the front frame base 1 through a first connecting rod assembly 10. The telescopic sleeve can enable the first upright post 7 and the second upright post 8 to contract and extend in the up-down direction so as to meet the alternate supporting of the front frame top beam 2 and the rear frame top beam 4.
Further, the top ends of the first upright post 7, the second upright post 8 and the front frame shield beam 9 are rotatably connected with the front frame top beam 2 through a cross connecting block. The cross connecting block has the function of enabling the front frame top beam 2 to be different in rising or falling height of the first upright post 7 and the second upright post 8, and enabling the front frame top beam 2 to rotate by a certain angle in the left-right direction and the front-back direction. In this embodiment, the front frame top member 2 can be rotated about 20 ° in the left-right direction and can be tilted about 12 ° in the front-rear direction. The function of the front frame shield beam 9 is to connect the fixed front frame top beam 2 to move as required to support the roof.
The rear frame supporting device comprises a third upright post 11 and a rear frame shielding beam 12; the bottom ends of the third upright post 11 and the rear frame shield beam 12 are both fixed on the rear frame base 3, and the top ends of the third upright post 11 and the rear frame shield beam 12 are both rotatably connected with the rear frame top beam 4.
Preferably, the third upright 11 is formed by a telescopic sleeve, and the rear frame shield beam 12 is fixedly connected to the rear frame base 3 by a second connecting rod assembly 13. The telescopic sleeve can enable the third upright post 11 to contract and extend in the up-down direction so as to meet the alternate support of the front frame top beam 2 and the rear frame top beam 4.
Further, the top ends of the third upright post 11 and the rear frame shield beam 12 are rotatably connected with the rear frame top beam 4 through a cross connecting block. The cross connecting block has the function that the top beam 4 of the rear frame can rotate a certain angle in the left and right directions so as to adapt to the condition of withdrawing the special top plate of the sector area of the working face in the fully mechanized mining. In this embodiment, the rear frame top beam 4 can be rotated by about 20 ° in the left-right direction, and the rear frame top beam 4 can be tilted by about 12 ° in the front-rear direction by providing a balance jack to apply a force to the third column 11. The rear frame roof rails 12 function similarly to the front frame roof rails 9 in that the connection and fixation of the rear frame roof rails 4 is moved as desired to support the roof.
The working principle of the support bracket of the embodiment of the invention is as follows: before the front frame base 1 moves forward, the first upright post 7 and the second upright post 8 are quickly descended, so that the front frame top beam 2 is separated from the top plate, and the rear frame top beam 4 completely supports the top plate and the bottom plate. At the moment, the rear frame takes the top plate and the bottom plate as supporting force, and then the pushing jack 6 is rapidly operated to extend out to push the front frame base 1 to move forwards; after the pushing jack 6 completely extends out, the first upright post 7 and the second upright post 8 are lifted, so that the front frame top beam 2 is in quick contact with the top plate, after the front frame top beam 2 completely supports the top plate and the bottom plate, the front frame uses the top plate and the bottom plate as supporting force, the rear frame top beam 4 is rapidly descended at the moment, and the rear frame top beam 4 is separated from the top plate. And then quickly retracting the pushing jack 6, so that when the pushing jack 6 is completely retracted, the third upright post 11 is lifted to enable the rear frame top beam 4 to contact the top plate, and thus the front frame top beam 2 and the rear frame top beam 4 are mutually supported into a cycle to meet the maintenance requirement of the special top plate of the sector-shaped belt.
When the front frame and the rear frame do not move forward, the side top is carried out by depending on the auxiliary frame top beam and the shielding beam side guard plate, and when the rear frame supports and the front frame moves forward, the auxiliary frame top beam and the shielding beam side guard plate can not be lifted to the side, the base side top mechanism is lifted by a jack by stretching the base side top mechanism, so that the base side top mechanism stretches out, and the front frame base moving forwards is lifted to the side. Meanwhile, the top beam side jacking mechanism extends out by extending out the top beam side jacking mechanism, so that the forward moving front frame jacking beam is laterally jacked, the forward moving front frame is integrally laterally jacked, and the front frame is prevented from deviating. After the front frame moves forwards to a preset position, the front frame is used for supporting and pulling the rear frame, and the rear frame is prevented from deviating through the base side jacking mechanism and the top beam side jacking mechanism in the forward moving process of the rear frame. And analogizing until all the hydraulic supports to be retracted on the working face are retracted.
According to the fully mechanized mining withdrawing working face sector area withdrawing method provided by the embodiment of the invention, the supporting brackets of the front bracket and the rear bracket are adopted, when the front bracket moves, the rear bracket can support the top plate of the sector area, when the rear bracket moves, the front bracket supports the top plate of the sector area, the top plate can be always supported in the moving process of the supporting brackets, the sinking of the top plate can be reduced, the supporting efficiency and withdrawing efficiency of the top plate are improved, the supporting brackets can move by stepping, the use of other equipment is reduced, the withdrawing cost is reduced, and meanwhile, the manual hydraulic control pilot adjacent bracket control device is adopted, so that workers do not operate in a dangerous area, and the safety is improved.
The technical solutions of the present invention have been described in detail with reference to specific embodiments, which are used to help understand the ideas of the present invention. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present invention also belong to the protection scope of the present invention.
Claims (7)
1. A fully mechanized coal mining withdrawal working face sector withdrawal method is characterized by comprising the following steps:
mounting a support bracket on the sector, wherein the support bracket supports a top plate of the sector;
drawing out the first hydraulic support to be withdrawn;
when the first hydraulic support to be withdrawn is withdrawn, the support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate;
when the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised;
when the supporting height of the supporting bracket rises to a first preset height, drawing out a second hydraulic bracket to be withdrawn;
after the Nth hydraulic support to be removed is drawn out, the supporting support moves towards the direction of the top wiping plate close to the (N + 1) th hydraulic support to be removed;
when the supporting bracket moves a first preset distance to the top wiping plate in the direction close to the (N + 1) th hydraulic bracket to be withdrawn, the supporting height of the supporting bracket is raised;
when the supporting height of the supporting bracket rises to a first preset height, drawing out the (N + 1) th hydraulic bracket to be removed, wherein N is more than or equal to 2;
when the supporting height of the supporting bracket rises to a first preset height, the drawing out of the second hydraulic bracket to be removed comprises the following steps:
when the supporting height of the supporting bracket rises to a first preset height, the auxiliary frame moves towards the direction of the second hydraulic bracket to be withdrawn to wipe the top plate, wherein the auxiliary frame is arranged adjacent to the supporting bracket;
when the auxiliary frame moves a second preset distance to the direction of the second hydraulic support to be withdrawn, the supporting height of the auxiliary frame is raised;
when the supporting height of the auxiliary frame rises to a second preset height, drawing out a second hydraulic support to be withdrawn;
when the supporting height of the auxiliary frame is raised to a second preset height, the drawing out of the second hydraulic support to be withdrawn comprises the following steps:
when the support height of the auxiliary frame is raised to a second preset height, the shield support moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate, wherein the shield support is arranged adjacent to the auxiliary frame;
when the shield support moves a third preset distance to the direction of the ceiling wiping plate close to the second hydraulic support to be withdrawn, the supporting height of the shield support is raised;
when the support height of the shield support rises to a third preset height, drawing out a second hydraulic support to be withdrawn;
the first preset distance is equal to the support width of the first hydraulic support to be withdrawn, and the first preset distance, the second preset distance and the third preset distance are equal.
2. A method of withdrawing a sector of a fully mechanized coal mining withdrawal face according to claim 1, wherein the raising and lowering of the support frame is controlled on the auxiliary frame and the raising and lowering of the auxiliary frame is controlled on the shield frame.
3. The fully mechanized coal mining withdrawal working face sector withdrawal method of claim 1, wherein the number of shield supports is 2 to 3, and adjacent shield supports are arranged in parallel.
4. The fully mechanized mining retraction face sector retraction method according to claim 1, wherein after the first hydraulic support to be retracted is extracted, the support bracket is moved toward the ceiling in a direction to approach the second hydraulic support to be retracted; when the supporting bracket moves a first preset distance to the ceiling plate in the direction close to the second hydraulic bracket to be withdrawn, the step of raising the supporting height of the supporting bracket comprises the following steps:
when the first hydraulic support to be withdrawn is drawn out, the front frame of the support bracket moves towards the direction of the second hydraulic support to be withdrawn to wipe the top plate;
when the front frame of the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, the supporting height of the front frame of the supporting bracket is raised to a fourth preset height;
the rear frame of the supporting bracket moves towards the direction of the second hydraulic bracket to be removed to wipe the top plate;
and when the rear frame of the supporting bracket moves a first preset distance to the ceiling wiping plate in the direction close to the second hydraulic bracket to be withdrawn, raising the supporting height of the rear frame of the supporting bracket to a fifth preset height, wherein the fourth preset height and the fifth preset height are both equal to the first preset height.
5. The fully mechanized coal mining withdrawal face sector withdrawal method of claim 4, wherein the support force of the front carriage after the moving is equal to the initial support force of the front carriage, and the support force of the rear carriage after the moving is equal to the initial support force of the rear carriage.
6. The fully mechanized mining retraction face sector retraction method according to claim 1, wherein the support force of the support shield after the movement is equal to the initial support force of the support shield, the support force of the auxiliary frame after the movement is equal to the initial support force of the auxiliary frame, and the support force of the shield after the movement is equal to the initial support force of the shield.
7. The fully mechanized mining retraction face sector retraction method according to any of claims 1 to 6, wherein the first hydraulic support to be retracted and the second hydraulic support to be retracted are both drawn off by a winch.
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| CN109882219B (en) * | 2019-04-15 | 2024-02-27 | 辽宁鑫丰矿业（集团）有限公司 | Fully mechanized mining face retraction system |
| CN110847909B (en) * | 2019-11-15 | 2020-11-20 | 山东科技大学 | Method for reducing top plate pressure of withdrawal channel at last stage of coal face extraction |
| CN112412515A (en) * | 2020-11-23 | 2021-02-26 | 中国矿业大学 | Frame-removing supporting method for self-moving type full-shield crushing top plate |
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