WO2020052012A1

WO2020052012A1 - Construction method for continuous mining machine having device continuously providing provisional roof support

Info

Publication number: WO2020052012A1
Application number: PCT/CN2018/112378
Authority: WO
Inventors: 张农; 谢正正; 魏群; 周俊瑶
Original assignee: 中国矿业大学
Priority date: 2018-09-11
Filing date: 2018-10-29
Publication date: 2020-03-19
Also published as: CN109209373A; CN109209373B; US20210270134A1

Abstract

A construction method for a continuous mining machine having a device continuously providing provisional roof support. A continuous mining machine (6) is comprised. The continuous mining machine (6) further comprises a device continuously providing provisional roof support. The device continuously providing provisional roof support comprises a rolling roof-protection portion (A). The rolling roof-protection portion (A) is fixed on a main machine frame of the continuous mining machine via a front column structure (B) and a rear column structure (C). While the continuous mining machine is cutting, the continuous temporary roof-protection device performs continuous load holding on a roof (3). After cutting, the device continuously providing provisional roof support provides effective temporary support to the roof, and performs support operations of an anchor bolt (5) on a rear portion of a cutting device, thereby achieving simultaneous performance of cutting and support operations, and improving tunneling efficiency. In the construction method, different support strengths are configured according to the hardness, completeness, and quality indicators of rock on a mine roof, such that the device continuously providing provisional roof support is able to effectively support the roof.

Description

Construction method of continuous miner with continuous temporary roof protection device

Technical field

The invention relates to a continuous mining machine, in particular to a construction method of a continuous mining machine having a continuous temporary roof protection device.

Background technique

Mining and driving are two very important links in the production system engineering of coal mines. Bolt support has many advantages such as safety, flexibility, and high efficiency. It is a support method widely used in coal mine roadways in China. With the continuous improvement of the level of mechanization, automation, and intelligence, the efficiency of comprehensive mining has gradually increased. In contrast, it is affected by the current supporting technology, etc., and the speed of the tunneling has increased slowly, which has caused the mining imbalance in coal production. Under the existing conditions of bolt support technology, increasing the speed of excavation is of great significance for alleviating the contradiction of mining replacement and improving the overall production efficiency of the mine.

Cantilever type roadheader supporting single-type anchor drilling rig and continuous mining machine with anchor drilling rig are the two most common types of tunneling supporting technology. Under the conditions of the conventional supporting technology of the single cantilever type drilling machine and the single-type anchor drilling rig, the cutting machine is required to stop and retreat after cutting a certain amount of footage. The single-bored drilling rig enters the working surface to support the operation; Under the conditions of the anchor drilling vehicle boring process, the continuous mining machine needs to exit or go to another roadway after cutting a certain footage, and the anchor drilling vehicle enters the working surface to carry out the support operation. An important feature of the above two supporting technologies is that the anchor support operation is located at the front of the cutting equipment, which results in that the cutting operation and the anchor support cannot be performed in parallel. The alternate construction of the two results in a low startup rate of the equipment. It severely restricted the improvement of the overall tunneling efficiency. After cutting, effective temporary support of the roof and anchor support at the rear of the cutting equipment are important prerequisites to achieve parallel operation of cutting and support, and then improve the efficiency of tunneling.

Summary of the Invention

The invention aims to solve the problem that the anchor support operation must be carried out in the front of the tunneling equipment, thereby causing the anchor support operation and the cutting operation to be unable to be carried out in parallel to affect the tunneling efficiency, and provides a connection with a continuous temporary roof protection device. Construction method of mining machine.

To achieve the above technical objectives, the technical solutions adopted by the present invention are:

A construction method of a continuous miner with a continuous temporary roof protection device, including a continuous miner. The continuous miner includes a host unit, a loading device, a horizontal-axis cutting drum, a transport device, and a crawler walking device. The transverse-axis cutting drum is hinged to the front of the main unit, the front of the transport device is connected to the loading device, and the transport device is fixedly connected to the main unit. The crawler running device is hydraulically driven and fixed to the main unit. Bottom; the continuous miner also includes a continuous temporary roof protection device, the loading device and the horizontal axis cutting drum are located in front of the continuous temporary roof protection device, the continuous temporary roof protection device includes rolling A protective roof, the rolling protective roof is fixed on the main unit of the continuous mining machine through a front pillar structure and a rear pillar structure;

The rolling top cover includes a frame body, a closed track ring, a first roller, a second roller, and an elastic supporting structure. The first roller and the second roller are hinged to two ends of the frame, respectively, and the closure A track ring is sleeved on the first roller and the second roller and is in rolling connection with the first roller and the second roller. A plurality of guide cylinders are fixed on the inner side of the frame body, and the guide cylinders are in contact with the elasticity. Support structure connection, the elastic support structure and the closed track ring rolling connection;

The front pillar structure includes a front square inner sleeve, a front square outer sleeve, and a front height adjustment oil cylinder. The bottom of the front square outer sleeve is fixed to the main unit of the continuous mining machine by bolts. The front square inner sleeve The cylinder is embedded in the front square outer sleeve, the bottom of the cylinder body of the front height adjustment cylinder is hinged with the front square outer sleeve, and the piston rod of the front height adjustment cylinder and the front square inner sleeve are hinged. Hinged, the upper end of the front square inner sleeve is hinged with the frame body;

The rear pillar structure includes a rear square inner sleeve, a rear square outer sleeve, and a rear height adjustment cylinder. The bottom of the rear square outer sleeve is fixed to the main unit of the continuous mining machine by bolts, and the rear square inner sleeve The cylinder is embedded in the rear square outer sleeve, the bottom of the cylinder body of the rear height adjustment cylinder is hinged with the rear square outer sleeve, and the piston rod of the rear height adjustment cylinder and the rear square inner sleeve are hinged. Hinged, the waist-shaped hole structure at the upper end of the rear square inner sleeve and the frame body are connected slidingly and rotationally through a pin;

An accumulator is connected to the oil inlet bypass of the rodless cavity of the front height adjustment cylinder and the oil inlet bypass of the rodless cavity of the rear height adjustment cylinder, and two oil inlets of the front height adjustment cylinder A directional valve is connected through a hydraulic lock, and two oil inlets of the rear height adjustment cylinder are connected to the directional valve through another hydraulic lock. A pressure gauge is provided between the directional valve and the hydraulic lock. And relief valves;

The horizontal axis cutting drum is adjustable in length and its maximum length is the same as the width WO of the construction roadway, and the total width of the loading device is smaller than the width WO of the construction roadway;

The construction method includes the following steps:

a. According to the geological conditions of the roadway area to be constructed, according to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", the rock layer of the roadway to be constructed is classified. This continuous mining machine is suitable for Class I, II and III Construction of roadway roof rock layer;

b. According to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", qualitatively divide the hardness and completeness of the roof rock mass of the roadway to be constructed, and determine the continuous temporary roof protection device according to the result of the qualitative division and the rock mass quality index. Support strength Pr;

c. According to the support strength Pr determined in step b, calculate the pressure Pc of the front height adjustment cylinder and the rear height adjustment cylinder according to the following formulas, the formula is:

Where R is the cylinder diameter of the front height adjustment cylinder or the rear height adjustment cylinder, L is the length of the contact surface between the rolling top guard and the roof, and WO is the width of the construction roadway;

d. According to the pressure result calculated in step c, perform pressure setting of the front height adjustment cylinder and the rear height adjustment cylinder, that is, with the assistance of a pressure gauge, adjust the overflow pressure value of the relief valve to the pressure value calculated in step c;

e. Operate the handle of the reversing valve to supply oil to the accumulator, the front height adjustment cylinder and the rear height adjustment cylinder, observe the pressure of the pressure gauge, and maintain the pressure for 3s when the pressure of the pressure gauge can not rise any more;

f. Determine the cutting length of the continuous mining machine according to the roof bolt row distance in the preset scheme. The distance of the single cycle cutting foot is the same as the roof bolt row distance in the preset scheme. Operate the company according to the distance of the single cycle cutting foot. The horizontal axis cutting drum of the mining machine cuts the coal, and the loading device shovels the coal rock cut by the horizontal axis cutting drum and transports the coal rock to the rear through the transportation device;

g. After the coal is cut, the continuous mining machine moves forward the corresponding cutting distance by a crawler walking device, and the rolling top protection of the continuous temporary roof protection device continues to support the roof of the construction roadway;

h. After the transfer is completed, the continuous mining machine will continue to cut the next cycle of coal. At the same time, the workers will use the anchor drilling rig to perform anchor support behind the continuous mining machine;

i. Return to step b after cutting the preset distance, that is, re-determine the support strength Pr of the continuous temporary roof protection device according to the rock mass of the roadway to be constructed, and the continuous mining machine will move forward along the preset roadway. Until the tunneling work is completed.

As a further improved technical solution of the present invention, the total width of the loading device is 200 mm smaller than the width WO of the construction roadway.

As a further improved technical solution of the present invention, the step b includes:

Qualitatively divide the hardness and integrity of the roof rock mass of the roadway to be constructed in accordance with GB / T 50218-2014 "Engineering Rock Mass Classification Standard";

When the qualitative characteristics of the hardness and completeness of the rock mass of the roadway roof are hard rock and the rock mass is intact, and the rock mass quality index BQ> 550, the support strength of the continuous temporary roof protection device Pr = 0.02MPa; when the roadway roof The qualitative characteristics of the hardness and integrity of the rock mass are hard rock and the rock mass is more complete or the qualitative feature is hard rock and the rock mass is intact, and the rock mass quality index BQ is 451 to 550. Support strength Pr = 0.05MPa; when the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is broken, hard rock and the rock mass is complete or soft rock and the rock mass is complete, and the rock When the body mass index BQ is 351 to 450, the support strength of the continuous temporary roof protection device is Pr = 0.1MPa.

As a further improved technical solution of the present invention, the preset distance in step i is 50m.

As a further improved technical solution of the present invention, the elastic supporting structure includes a supporting roller, a fork frame and a butterfly spring group, the supporting roller is in rolling connection with the closed track ring, and the supporting roller is connected with all The fork-shaped frame is hinged, a lower limit cylinder is provided at the lower portion of the fork-shaped frame, a central cylinder is provided at the center of the limit cylinder, and the limit cylinder of the fork-shaped frame is sleeved on the outside of the guide cylinder and forks A shape frame is in contact with the butterfly spring group, the central cylinder of the fork frame is inserted into the center hole of the butterfly spring group and the butterfly spring group is placed in the guide cylinder, and the closed track ring is Parts in contact with the roof of the roadway.

As a further improved technical solution of the present invention, the closed track ring is hinged from a plurality of tracks. The track includes a track shoe base, hard rubber, and a chain rail. The hard rubber is fixed on the track shoe base. The chain track is connected to the track shoe base, and each of the track tracks is hinged by a chain track.

As a further improved technical solution of the present invention, the hard rubber is adhered to the track shoe base body by epoxy resin, and the hard rubber is fixed to the track shoe base body by hexagon socket screws.

As a further improved technical solution of the present invention, the rolling top cover includes a tensioning mechanism, and the tensioning mechanism is used to push the first roller to realize the tension of the closed track ring.

As a further improved technical solution of the present invention, there are two continuous temporary roof protection devices.

The beneficial effects of the present invention are:

(1) In the construction method of the present invention, while the continuous mining machine is cutting, the continuous temporary roof protection device can continuously maintain the roof. Therefore, the anchor drilling rig does not need to enter the front to stop the continuous mining machine and retreat continuously. The temporary roof protection device performs effective temporary support for the roof after cutting, and performs anchor support operations at the rear of the cutting equipment, realizing parallel operations of cutting and support, and improving tunneling efficiency. The construction method sets different support strengths according to the rigidity, integrity and quality indicators of the roof rock, and completes the effective support of the continuous temporary roof protection device to the roof to prevent the insufficient support strength from leading to the anchor rod of the subsequent bolt rig. Support operations cannot be performed effectively.

(2) The rolling roof protection method of the construction method of the present invention can realize continuous support of the continuous mining machine to the exposed roof after cutting, preventing damage to the roof caused by repeated loading and unloading of the roof when the continuous mining machine is displaced, and anchor support. The operation can be carried out at the rear of the continuous mining machine, creating conditions for parallel operation of cutting and support, high driving efficiency, and reducing the impact of anchor support on cutting.

(3) The closed track ring of the present invention is in rolling contact with the elastic supporting structure, the first roller and the second roller. When the roof of the roadway is uneven, the compression amounts of the butterfly spring groups of the plurality of elastic supporting structures are different, thereby enabling the closed track ring to achieve good contact with the uneven roadway roof, having a large contact surface with the roadway roof, and high safety.

(4) According to the present invention, pressure oil can be introduced into the rodless cavity of the front height adjustment cylinder and the rear height adjustment cylinder through the reversing valve. The front height adjustment cylinder and the rear height adjustment cylinder drive the rolling top to load the top plate, and the reversing valve When pressure oil is not supplied to the front height adjustment cylinder and the rear height adjustment cylinder, the pressure oil in the accumulator causes the front height adjustment cylinder and the rear height adjustment cylinder to be loaded, thereby ensuring the continuous protection of the rolling top guard against the top plate. High efficiency reduces labor intensity.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of the working state of the continuous mining machine in a driving tunnel of the present invention.

Fig. 2 is a plan view of a continuous miner according to the present invention.

Fig. 3 is a perspective view of a continuous miner according to the present invention.

FIG. 4 is a schematic structural diagram of a continuous temporary roof protecting device of the present invention.

FIG. 5 is a schematic structural diagram of a rolling top cover according to the present invention.

Fig. 6 is a partial cross-sectional view of a rolling top cover according to the present invention.

FIG. 7 is a schematic structural diagram of a fork-shaped frame of the present invention.

FIG. 8 is a schematic structural view of a track of the present invention.

FIG. 9 is a schematic structural diagram of a front pillar structure of the present invention.

FIG. 10 is a schematic structural diagram of a rear pillar structure of the present invention.

Fig. 11 is a schematic diagram of the hydraulic principle of the present invention.

detailed description

The specific embodiments of the present invention are further described below with reference to FIGS. 1 to 11:

This embodiment aims to solve the problem that the anchor support operation must be carried out in front of the boring equipment, which causes the anchor support operation and the cutting operation to be unable to be carried out in parallel to affect the tunneling efficiency. A continuous temporary roof protection device is provided Construction method of continuous mining machine. details as follows:

Referring to FIG. 1, the marks in FIG. 1 are specifically expressed as: roadway floor 1, driving face 2, unsupported roadway roof 3 after cutting, roadway roof 4 which has been supported, roof bolt 5, and continuous mining machine 6 .

A continuous mining machine construction method with a continuous temporary roof protection device includes a continuous mining machine 6, FIG. 2 is a top view of the continuous mining machine 6, see FIG. 2 and FIG. 3, the continuous mining machine 6 includes a main engine unit , Loading device 61, horizontal-axis cutting roller 62, transportation device 63, and crawler running device 64; the horizontal-axis cutting roller 62 is hinged to the front portion of the main frame of the main unit, and the front portion of the transportation device 63 is The loading device 61 is connected and the transportation device 63 is fixedly connected to the main frame of the main unit. The crawler running device 64 is hydraulically driven and fixed at the bottom of the main frame. The main frame includes a main frame, a hydraulic system, and an electronic control system. The system and electronic control system are fixed on the main frame and used to drive the continuous mining machine. The specific structure adopts the driving structure of the existing continuous mining machine. The continuous mining machine 6 further includes a continuous temporary roof protection device. The loading device 61 and the horizontal axis cutting drum 62 are located in front of the continuous temporary roof protection device. Rolling protective top A, which is fixed to the main frame of the main unit of the continuous mining machine 6 through a front pillar structure B and a rear pillar structure C; when the cutting operation of the horizontal axis cutting drum 62 is continuous, Temporary roof protection device can continuously maintain the roof to achieve effective temporary support for the exposed roof after cutting. Anchor support work is performed at the rear of the cutting equipment. It is not necessary to make the drilling equipment enter the front of the anchor drilling rig. Stop and retreat to achieve parallel operation of cutting and support, thereby improving the efficiency of tunneling.

4 and 5, the rolling top cover A includes a frame body A2, a closed track ring A3, a first roller A10, a second roller A1, and an elastic supporting structure. The first roller A10 and the second roller A1 They are hinged to the two ends of the frame A2, respectively, and can be rotated relative to the frame A2. The closed track ring A3 is sleeved on the first roller A10 and the second roller A1 and is connected with the first roller A10 and The second roller A1 is rollingly connected. Referring to FIG. 6, a plurality of guide cylinders A8 are fixed to the inside of the frame A2 (the frame A2 includes a long hollow shell and is used to connect with the front pillar structure B and the rear pillar structure C The triangular-shaped bracket, the left and right ends of the elongated hollow casing are hinged to the first roller A10 and the second roller A1, the top of the elongated hollow casing is an opening, and the guide tube A8 is fixed in the elongated hollow casing. On the inner bottom of the body, the front and back side walls of the long hollow shell are fixed with triangle-like brackets for connection with the front pillar structure B and the rear pillar structure C, and the specific structure is shown in FIG. 4). The guide cylinder A8 is connected to the elastic supporting structure, and the elastic supporting structure is connected to the closing Connecting ring rolling track A3; A3 i.e. a closed loop with the elastic crawler Supporting structure, a first rolling contact between the roller and the second roller A10 A1. The first roller A10 and the second roller A1 of the rolling protection top A can rotate freely. When the continuous mining machine is shifted back and forth, the closed track A3 and the roof are rolled under load to achieve continuous temporary support for the roof.

Referring to FIG. 9, the front pillar structure B includes a front square inner sleeve B1, a front square outer sleeve B2, and a front height adjustment cylinder B3. The bottom of the front square outer sleeve B2 is fixed to the main unit of the continuous mining machine 6 by bolts. On the main frame, one end of the front square inner sleeve B1 is embedded in the front square outer sleeve B2, the front square inner sleeve B1 can slide in the front square outer sleeve B2, and the front height is adjusted The bottom of the cylinder block of the oil cylinder B3 is hinged to the front square outer sleeve B2 through a pin, and the top of the cylinder block of the front height adjustment cylinder B3 extends into the interior of the front square inner sleeve B1 and the front height adjustment cylinder B3 The piston rod is hinged to the front square inner sleeve B1 through a pin, and the upper end of the front square inner sleeve B1 is hinged to the frame A2 through a pin; the articulation method is shown in FIG. 4; the front height adjustment cylinder B3 It is a double-acting cylinder. The lower oil port of the front height adjustment cylinder B3 has a rod cavity extending from the bottom of the front square outer sleeve B1 through a pipe and is connected with pressure oil. The upper oil port of the front height adjustment cylinder B3 has a rod cavity through the pipe. Protrude from the bottom of the front square inner sleeve B2 and the bottom of the front square outer sleeve B1 in order, and connect Connected with pressure oil.

10, the rear pillar structure C includes a rear square inner sleeve C1, a rear square outer sleeve C2, and a rear height adjustment cylinder C3. The bottom of the rear square outer sleeve C2 is fixed to the main unit of the continuous mining machine 6 by bolts. On the main frame, one end of the rear square inner sleeve C1 is embedded in the rear square outer sleeve C2, and the rear square inner sleeve C1 can slide in the rear square outer sleeve C2. The rear height is adjusted The bottom of the cylinder body of the oil cylinder C3 is hinged to the rear square outer sleeve C2 through a pin, and the top of the cylinder body of the rear height adjustment oil cylinder C3 projects into the inside of the rear square inner sleeve C1 and the rear height adjustment oil cylinder. The piston rod of C3 is hinged to the rear square inner sleeve C1 through a pin, and the waist-shaped hole structure C11 at the upper end of the rear square inner sleeve C1 and the frame A2 are slidingly and rotationally connected by a pin; the The rear height adjustment cylinder C3 is a double-acting cylinder, and the waist-shaped hole structure C11 gives a certain reserved space for the absorption difference. Therefore, when the roof is uneven, the rolling top A can be inclined at an angle in the front and rear direction. Without destroying the front and rear pillar structures.

Referring to FIG. 11, the inlet bypass of the rodless cavity of the front height adjustment cylinder B3 and the inlet bypass of the rodless cavity of the rear height adjustment cylinder C3 are both connected with an accumulator B6, and the front height adjustment The two oil inlets of the oil cylinder B3 are connected to a directional valve B4 through a hydraulic lock B5, and the two oil inlets of the rear height adjustment oil cylinder C3 are connected to the directional valve B4 through another hydraulic lock B5; Pressure oil is passed to the rodless cavity or rod cavity of the front height adjustment cylinder B3 through the reversing valve B4, and pressure oil is passed to the rodless cavity or rod cavity of the rear height adjustment cylinder C3, thereby realizing the front height adjustment cylinder B3 Load and unload with the rear height adjustment cylinder C3; When the directional valve B4 does not pass pressure oil to the front height adjustment cylinder B3 and the rear height adjustment cylinder C3, the pressure oil in the accumulator B6 makes the front height adjustment cylinder B3 and The rear height adjustment cylinder C3 is loaded, thereby ensuring the continuous loading of the rolling top guard A to the top plate. A pressure gauge B7 and a relief valve B8 are provided between the directional valve B4 and the hydraulic lock B5. The relief pressure of the relief valve B8 can be adjusted with the aid of the pressure gauge B7 to achieve different support strengths.

There are two continuous temporary roof protection devices in this embodiment. Therefore, there are two front height adjustment cylinders B3 and rear height adjustment cylinders C3.

The horizontal-axis cutting drum 62 is adjustable in length and its maximum length is the same as the width WO of the construction roadway. The total width of the loading device 61 is 200 mm smaller than the width WO of the construction roadway.

The construction method includes the following steps:

a. According to the geological conditions of the roadway area to be constructed, according to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", the rock layer of the roadway to be constructed is classified. This continuous mining machine 6 is suitable for Class I, II and III Of the roof rock layer of the roadway;

b. According to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", qualitatively divide the hardness and completeness of the roof rock mass of the roadway to be constructed, and determine the continuous temporary roof protection device according to the result of the qualitative division and the rock mass quality index Support strength Pr;

c. According to the support strength Pr determined in step b, calculate the pressure Pc of the front height adjustment cylinder B3 and the rear height adjustment cylinder C3 according to the following formula (1), the formula is:

Where R is the bore diameter of the front height adjustment cylinder B3 or the rear height adjustment cylinder C3, L is the length of the contact surface between the rolling top A and the roof, and WO is the width of the construction roadway;

d. Set the pressure of front height adjustment cylinder B3 and rear height adjustment cylinder C3 according to the pressure result calculated in step c. That is, with the help of pressure gauge B7, adjust the overflow pressure value of relief valve B8 to the value calculated in step c. Pressure value;

e. Operate the handle of the reversing valve B4 to supply the accumulator B6, the front height adjustment cylinder B3 and the rear height adjustment cylinder C3, and observe the pressure of the pressure gauge B7. When the pressure of the pressure gauge B7 rises to no longer rise, maintain the pressure. 3s

f. Determine the cutting length of the continuous mining machine 6 according to the row distance of the roof bolts in the preset scheme. The distance of the cutting length of the single cycle is the same as the row distance of the roof bolts in the preset scheme. Operate according to the distance of the cutting length of the single cycle. The horizontal-axis cutting drum 62 of the continuous mining machine 6 performs coal cutting, and the loading device 61 shovels the coal and rock cut by the horizontal-axis cutting drum 62 and conveys the coal and rock to the rear through the transporting device 63;

g. After the coal is cut, the continuous mining machine 6 forwards the corresponding cutting distance by a track walking device 64, and the rolling top A of the continuous temporary roof protection device continues to support the roof of the construction roadway;

h. After the transfer is completed, the continuous mining machine 6 continues to cut the next cycle of coal. At the same time, the workers use anchor bolt rigs to perform anchor support behind the continuous mining machine 6; thereby achieving simultaneous operation of coal cutting and support , Drastically increased the speed of tunneling;

i. Return to step b after cutting the preset distance, that is, re-determine the support strength Pr of the continuous temporary roof protection device according to the rock mass of the roadway to be constructed, and the continuous mining machine 6 will work forward along the direction of the preset roadway. Work until the tunneling work is completed. The preset distance in step i is 50m.

In this embodiment, the step b includes:

(1) According to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", the hardness and completeness of the rock mass of the roadway roof to be constructed shall be qualitatively divided;

(2) When the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is intact, and the rock mass quality index BQ> 550, the support strength of the continuous temporary roof protection device Pr = 0.02MPa; When the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is more complete or the qualitative characteristics are hard rock and the rock mass is complete, and the rock mass quality index BQ is 451 to 550, continuous temporary protection Supporting strength of the roof device Pr = 0.05MPa; when the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is broken, hard rock and the rock mass is complete or soft rock and the rock mass is complete When the rock mass quality index BQ is 351 to 450, the support strength of the continuous temporary roof protection device Pr = 0.1MPa.

In this embodiment, a continuous temporary roof protection device is provided on the continuous mining machine 6. While the continuous mining machine cuts, the continuous temporary roof protection device can continuously maintain the roof, so the anchor drilling rig does not need to enter the continuous mining machine 6. The front part causes the continuous mining machine 6 to stop and retreat. The continuous temporary roof protection device provides effective temporary support for the roof after cutting. The anchor support operation is performed at the rear of the cutting equipment to achieve cutting and support. It is an important prerequisite for protecting parallel operations and improving tunneling efficiency. The construction method used in this embodiment sets different support strengths according to the rigidity, integrity and quality indicators of the roof rock, and completes the effective support of the continuous temporary roof protection device to the roof, preventing the insufficient strength of the support from leading to the back anchor The anchor support operation of the rod rig cannot be performed effectively.

In this embodiment, referring to FIG. 6, the elastic supporting structure includes a supporting roller A6, a fork frame A5, and a butterfly spring group A7, and the supporting roller A6 passes through the elongated hollow casing of the frame body A2. The top part is thus in a rolling connection with the closed crawler ring A3, the support roller A6 is hinged to the fork frame A5, and the support roller A6 can rotate freely. See FIG. 7, the lower portion of the fork frame A5 is provided with a limited position A cylinder A11, a central cylinder A12 is provided at the center position of the limiting cylinder A11, a limiting cylinder A11 of the fork A5 is sleeved on the outside of the guiding cylinder A8, and a fork A5 and the butterfly spring group A7 contact, the central cylinder A12 of the fork frame A5 is inserted into the center hole of the butterfly spring group A7 and the butterfly spring group A7 is placed in the guide cylinder A8, and the closed crawler ring A3 is the same as The parts in contact with the roof of the roadway. The closed track ring A3 is in rolling contact with the elastic supporting structure, the first roller A10, and the second roller A1. When the roof of the roadway is uneven, a plurality of butterfly spring groups A7 of the elastic supporting structure have different compression amounts. , So that the closed track ring A3 can achieve good contact with the uneven roadway roof.

In this embodiment, the closed track ring A3 is articulated by a plurality of tracks A4. Referring to FIG. 8, the track A4 includes a track shoe base A13, a hard rubber A14, and a chain rail A16, and the hard rubber A14 is fixed to the vehicle. On the track shoe base A13, the chain rail A16 is connected to the track shoe base A13, and each of the track A4 is hinged through a chain track A16.

In this embodiment, referring to FIG. 8, the hard rubber A14 is bonded to the track shoe base A13 by an epoxy resin, and the hard rubber A14 is fixed to the track shoe base A13 by an Allen screw A15.

In this embodiment, referring to FIG. 6, the rolling top cover A includes a tensioning mechanism A9 (a tensioner commonly used in the prior art can be adopted), and the tensioning mechanism A9 is disposed in the long hollow shell of the frame A2 The tensioning mechanism A9 is used to push the first roller A10 to realize the tensioning of the closed track ring A3. The first roller A10 is connected to one end of the frame body A2 through 360 degrees, and the first roller A10 is horizontally slidably connected to one end of the frame body A2. It has a certain horizontal sliding space, and provides a tensioning stroke for the tensioning mechanism A9. .

In this embodiment, first, the front height adjusting cylinder B3 drives the front square inner sleeve B1 under the action of pressure oil. The front square inner sleeve B1 pushes the frame A2 in the rolling top A, and the front square The sleeve B1 is hinged to the frame A2; the rear height adjustment cylinder C3 drives the rear square inner sleeve C1 under the action of pressure oil, and the rear square inner sleeve C1 pushes the frame A2 in the rolling top A and the rear square inner sleeve The cylinder C1 and the frame A2 are horizontally slidably connected and rotatable. The first roller A10 and the second roller A1 articulated on the frame A2 are driven by the continuous mining machine 6 to drive the closed crawler ring A3 along the roadway roof. The closed crawler ring A3 and the elastic supporting structure, the first roller A10, and the second roller The rolling contact between A1, the butterfly spring group A7 of the multiple elastic supporting structures has different compression amounts, so that the closed crawler ring A3 can achieve good contact with the uneven roadway roof; finally, temporary support for the roadway roof is realized.

Claims

Construction method of continuous miner with continuous temporary roof protection device, including continuous miner (6), said continuous miner (6) including main machine part, loading device (61), horizontal-axis cutting drum (62) A transport device (63) and a crawler running device (64). The horizontal-axis cutting drum (62) is hinged to the front portion of the main unit. The front portion of the transport device (63) is connected to the loading device ( 61) The connection and transportation device (63) is fixedly connected to the main engine. The crawler running device (64) is hydraulically driven and fixed at the bottom of the main engine. It is characterized in that the continuous mining machine (6) further includes The continuous temporary roof protection device, the loading device (61) and the horizontal axis cutting drum (62) are located in front of the continuous temporary roof protection device, and the continuous temporary roof protection device includes a rolling top protection device ( A), the rolling top guard (A) is fixed on the main part of the continuous mining machine (6) through a front pillar structure (B) and a rear pillar structure (C);

The rolling top cover (A) includes a frame body (A2), a closed track ring (A3), a first roller (A10), a second roller (A1), and an elastic supporting structure. The first roller (A10) And the second roller (A1) are hinged to the two ends of the frame (A2), and the closed track ring (A3) is sleeved on the first roller (A10) and the second roller (A1) and is The first roller (A10) and the second roller (A1) are connected in a rolling manner. A plurality of guide cylinders (A8) are fixed inside the frame body (A2), and the guide cylinder (A8) and the elastic support weight Structural connection, the elastic supporting structure is rolling connected with the closed track ring (A3);

The front pillar structure (B) includes a front square inner sleeve (B1), a front square outer sleeve (B2), and a front height adjustment cylinder (B3). The bottom of the front square outer sleeve (B2) is fixed by bolts. On the main unit of the continuous mining machine (6), the front square inner sleeve (B1) is embedded in the front square outer sleeve (B2), and the bottom of the cylinder body of the front height adjustment cylinder (B3) It is hinged with the front square outer sleeve (B2), the piston rod of the front height adjustment cylinder (B3) is hinged with the front square inner sleeve (B1), and the upper end of the front square inner sleeve (B1) Hinged with the frame body (A2);

The rear pillar structure (C) includes a rear square inner sleeve (C1), a rear square outer sleeve (C2), and a rear height adjustment cylinder (C3). The bottom of the rear square outer sleeve (C2) is fixed by bolts. On the main part of the continuous mining machine (6), the rear square inner sleeve (C1) is embedded in the rear square outer sleeve (C2), and the bottom of the cylinder body of the rear height adjustment cylinder (C3) It is hinged with the rear square outer sleeve (C2), the piston rod of the rear height adjustment cylinder (C3) is hinged with the rear square inner sleeve (C1), and the upper end of the rear square inner sleeve (C1) The waist-shaped hole structure (C11) and the frame body (A2) are slidingly and rotationally connected through a pin;

An accumulator (B6) is connected to the bypass inlet of the rodless cavity of the front height adjustment cylinder (B3) and the inlet bypass of the rodless cavity of the rear height adjustment cylinder (C3). The two oil inlets of the height adjustment cylinder (B3) are connected to a directional valve (B4) through a hydraulic lock (B5), and the two oil inlets of the rear height adjustment cylinder (C3) are connected through another hydraulic lock ( B5) is connected with the directional valve (B4), and a pressure gauge (B7) and a relief valve (B8) are provided between the directional valve (B4) and the hydraulic lock (B5);

The horizontal axis cutting drum (62) is adjustable in length and its maximum length is the same as the width WO of the construction roadway, and the total width of the loading device (61) is smaller than the width WO of the construction roadway;

The construction method includes the following steps:

a. According to the geological conditions of the roadway area to be constructed, according to the GB / T 50218-2014 "Engineering Rock Mass Classification Standard", the rock strata of the roadway to be constructed are classified. This continuous mining machine (6) is suitable for Class I, Class II and Construction of roof rock layer of class Ⅲ roadway;

b. According to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", qualitatively divide the hardness and integrity of the roof rock mass of the roadway to be constructed, and determine the continuous temporary roof protection device based on the results of the qualitative division and the quality index of the rock mass. Support strength Pr;

c. According to the support strength Pr determined in step b, calculate the pressure Pc of the front height adjustment cylinder (B3) and the rear height adjustment cylinder (C3) according to the following formula (1), the formula is:

Where R is the cylinder diameter of the front height adjustment cylinder (B3) or the rear height adjustment cylinder (C3), L is the length of the contact surface between the rolling top guard (A) and the roof, and WO is the width of the construction roadway;

d. Set the pressure of the front height adjustment cylinder (B3) and the rear height adjustment cylinder (C3) according to the pressure result calculated in step c, that is, adjust the overflow of the relief valve (B8) with the assistance of the pressure gauge (B7). Flow pressure value to the pressure value calculated in step c;

e. Operate the handle of the reversing valve (B4) to supply the accumulator (B6), the front height adjustment cylinder (B3) and the rear height adjustment cylinder (C3), and observe the pressure of the pressure gauge (B7). B7) when the pressure rises to no more, the pressure is maintained for 3s;

f. Determine the cutting length of the continuous miner (6) according to the row distance of the roof bolts in the preset scheme. The distance for the cutting length of the single cycle is the same as the row distance of the roof bolts in the preset scheme. The coal is cut from the horizontal axis cutting drum (62) of the continuous mining machine (6), and the loading device (61) shoves the coal and rock cut by the horizontal axis cutting drum (62) and transports the coal and rock. The device (63) is transported to the rear for delivery;

g. After the coal is cut, the continuous mining machine (6) moves forward the corresponding cutting distance by a track walking device (64), and the rolling roof protection (A) of the continuous temporary roof protection device continues to the construction roadway. Roof support

h. After the transfer is completed, the continuous mining machine (6) continues to perform the next cycle of coal cutting. At the same time, the worker uses the anchor drill to perform anchor support behind the continuous mining machine (6);

i. Return to step b after cutting the preset distance, that is, re-determine the support strength Pr of the continuous temporary roof protection device according to the rock mass of the roadway to be constructed, and the continuous mining machine (6) moves in the direction of the preset roadway. Before construction work until the tunneling work is completed.
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 1, characterized in that the total width of the loading device (61) is 200 mm smaller than the width WO of the construction roadway.
The method for constructing a continuous miner with a continuous temporary roof protection device according to claim 2, wherein the step b comprises:

(1) According to GB / T 50218-2014 "Engineering Rock Mass Classification Standard", the hardness and completeness of the rock mass of the roadway roof to be constructed shall be qualitatively divided;

(2) When the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is intact, and the rock mass quality index BQ> 550, the support strength of the continuous temporary roof protection device Pr = 0.02MPa; When the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is more complete or the qualitative characteristics are hard rock and the rock mass is complete, and the rock mass quality index BQ is 451 to 550, continuous temporary protection Supporting strength of the roof device Pr = 0.05MPa; when the qualitative characteristics of the hardness and integrity of the roof rock mass of the roadway are hard rock and the rock mass is broken, hard rock and the rock mass is complete or soft rock and the rock mass is complete When the rock mass quality index BQ is 351 to 450, the support strength of the continuous temporary roof protection device Pr = 0.1MPa.
The method for constructing a continuous miner with a continuous temporary roof protection device according to claim 1, wherein the preset distance in step i is 50m.
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 1, wherein the elastic supporting structure comprises a supporting roller (A6), a fork frame (A5) and a butterfly spring In group (A7), the support roller (A6) is in rolling connection with the closed track ring (A3), the support roller (A6) is hinged to the fork frame (A5), and the fork frame ( A5) is provided with a limiting cylinder (A11) at the lower part, a central cylinder (A12) is provided at the center of the limiting cylinder (A11), and the limiting cylinder (A11) of the fork frame (A5) is sleeved on the The outside of the guide cylinder (A8) and the fork frame (A5) are in contact with the butterfly spring group (A7), and the central cylinder (A12) of the fork frame (A5) is inserted into the butterfly spring group (A7) And the butterfly spring group (A7) is placed in the guide cylinder (A8), and the closed track ring (A3) is a component that is in contact with the roof of the roadway.
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 1, characterized in that the closed track ring (A3) is articulated by a plurality of tracks (A4), and the track (A4 ) Includes a track shoe base (A13), hard rubber (A14), and a chain rail (A16), the hard rubber (A14) is fixed on the track shoe base (A13), and the chain rail (A16) and the The track shoe base (A13) is connected, and each of the track tracks (A4) is hinged through a chain rail (A16).
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 6, wherein the hard rubber (A14) is bonded to the track shoe base (A13) by epoxy resin and The hard rubber (A14) is fixed on the track shoe base (A13) by an Allen screw (A15).
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 1, wherein the rolling roof protection (A) comprises a tensioning mechanism (A9), and the tensioning mechanism (A9 ) Is used to push the first roller (A10) to achieve the tension of the closed track ring (A3).
The construction method of a continuous miner with a continuous temporary roof protection device according to claim 1, wherein there are two continuous temporary roof protection devices.