Roof cutting equipment and method for gob-side entry retaining

Abstract

The invention relates to the technical field of coal mine tunnels, in particular to roof cutting equipment for gob-side entry retaining and a roof cutting method.The roof cutting equipment comprises two telescopic main rods, a first bend wheel is arranged at the top of one telescopic main rod, a first guide wheel is arranged at the bottom of one telescopic main rod, and a second bend wheel is arranged at the top of the other telescopic main rod, and a second guide wheel is arranged at the bottom of the other telescopic main rod; the device further comprises a traction mechanism and a rope saw, a driving wheel is arranged on the traction mechanism, the rope saw sequentially bypasses the driving wheel, the first guide wheel, the first bend wheel, the second bend wheel and the second guide wheel to form a ring, the driving wheel is used for driving the rope saw to move circularly, and the traction mechanism can drive the driving wheel to move longitudinally. After the rope saw bypasses the guide wheels and the top plate of the two telescopic main rods, the rope saw forms a U shape, and in the top cutting process, the traction mechanism drives the driving wheel to longitudinally move to provide tensile force for the rope saw, so that the rope saw can gradually form a linear shape from the U shape, and the top plate in a change area from the U shape to the linear shape is cut open by the rope saw to realize top cutting operation.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine tunnels, and in particular to a top cutting device and a top cutting method for a tunnel retained along a goaf. Background Art

[0002] Since the goaf-side lane-retaining technology was studied and used in my country in the 1950s, it has been an important technical direction for green and efficient mining in underground coal mines. The goaf-side lane refers to the original mining lane maintained along the edge of the goaf behind the coal mining face, which is used as the next mining face. Generally, the transportation lane of the previous face is maintained through certain technical means and used as the ventilation lane of the next face. The goaf-side lane-retaining technology has great advantages both technically and economically. First, the elimination of the supporting coal pillars maximizes the recovery of resources and improves the recovery rate; second, the use of a lane twice shortens the construction period of the working face and greatly saves investment.

[0003] The key to gob-side tunneling technology is the support of gob-side tunnels. The initial support methods include wood piles, gangue masonry, dense pillars, prefabricated component piles, and now quick-setting materials (flexible molds). The key to the maintenance effect of gob-side tunneling is to take effective measures according to the law of mine pressure manifestation in gob-side tunneling. When the direct roof of the working face collapses, since the direct roof of the gob-side tunneling is connected to the direct roof of the working face, the collapse of the direct roof will drive the direct roof of the tunnel to sink, causing the roof pressure of the gob-side tunnel to increase sharply; when the old roof is used for pressure, the roof pressure of the gob-side tunnel reaches the highest value, and the deformation of the tunnel is the most serious. At this time, if the strength of the support material is not enough, the support material will be damaged at the least, and the tunnel roof will collapse at the worst.

[0004] In order to improve the above difficulties, effective measures such as blasting pre-splitting and roof cutting are currently adopted. Deep holes are drilled in advance along the coal wall side of the working face in the direction of advancement of the working face, and pre-splitting is performed by blasting to separate the working face roof from the remaining roadway roof, and to relieve the impact of the working face roof collapse on the remaining roadway roof. However, due to the complex geological conditions, blasting pre-splitting may not necessarily blast in the designed direction, and sometimes it may damage the remaining roadway roof, and this plan cannot be implemented in some working faces with severe gas disasters. At present, there are also methods such as chain saw equipment for roof cutting. The chain saw equipment looks like an electric saw and cuts the roof through a saw chain. However, the chain saw roof cutting method has the following shortcomings: the chain arm of the chain saw is a cantilever beam, and its length is limited, so the depth of cutting the roof is also limited, and the equipment is large in size. The transport roadway needs to be installed with both a chain saw and a conveyor, which requires the roadway to be enlarged, increases the workload of roadway construction, and increases cost investment. Summary of the invention

[0005] The purpose of the present invention is to provide a top cutting equipment and a top cutting method for retaining a tunnel along the goaf in view of the problems that the top cutting by blasting or chain saw equipment in the background technology is insufficient.

[0006] The present invention provides a top cutting equipment for gob-side lane retention, comprising two telescopic main rods arranged opposite to each other, one of the telescopic main rods having a first redirecting wheel at the top and a first guide wheel at the bottom, and the other telescopic main rod having a second redirecting wheel at the top and a second guide wheel at the bottom; It also includes a traction mechanism and a rope saw, wherein the traction mechanism is provided with a driving wheel, the rope saw sequentially passes around the driving wheel, the first guide wheel, the first redirecting wheel, the second redirecting wheel and the second guide wheel to form a ring, the driving wheel is used to drive the rope saw to circulate, and the traction mechanism can drive the driving wheel to move longitudinally.

[0007] The top cutting equipment described in the present application includes two relatively arranged telescopic main rods, each telescopic main rod top plate is provided with a redirecting wheel and a guide wheel is provided at the bottom, the rope saw passes around the driving wheel, the redirecting wheel and the guide wheel and surrounds the city in a ring shape, and then the driving wheel drives the rope saw to circulate, so that the rope saw can cut off the top plate in contact with it. When cutting the top, after the rope saw passes around the guide wheels and the top plate of the two telescopic main rods, the rope saw forms a U shape. During the top cutting process, the traction mechanism drives the driving wheel to move longitudinally, providing tensioning force for the rope saw, so that the rope saw gradually forms a straight shape from the U shape, so that the top plate in the area changing from the U shape to the straight shape is cut by the rope saw to realize the top cutting operation. The top cutting equipment of the present application provides a new equipment, which solves the problem of difficult top cutting in mines, avoids the uncontrollability of blasting pre-splitting top cutting, and realizes precise top cutting. Compared with top cutting with chain saw equipment, the equipment of the present application occupies a small space, does not require widening of the tunnel, and has lower investment.

[0008] Preferably, it further comprises a travel track, which is laid along the length direction of the laneway, and the traction mechanism can move relatively on the travel track.

[0009] The traction mechanism can move relatively on the walking track, so that the traction machine can move a certain distance on the walking track to ensure that the rope saw can maintain a certain tension during the top cutting operation, so that the rope saw is tensioned and the stability of the rope saw during cutting is guaranteed. Furthermore, by applying tension to the rope saw, effective contact between the rope saw and the top plate is ensured during the top cutting operation to ensure the normal progress of the top cutting operation.

[0010] Preferably, the telescopic main rod comprises an assembly rod and a telescopic jack, the assembly rod is connected to the top of the telescopic jack, the telescopic jack is used to lift the assembly rod, and the telescopic jack is installed on a supporting base.

[0011] By extending the telescopic jack, the telescopic main rod is extended as a whole, so that the U-shape of the rope saw is pushed upward, so that the rope saw can cut upward all the time.

[0012] Preferably, the assembly rod is composed of several sections of standard drill rods, and adjacent standard drill rods are detachably connected.

[0013] The assembly rod is composed of several sections of standard drill rods. By continuously adding new standard drill rods, the assembly rod is lengthened as a whole. After the telescopic jack reaches the maximum stroke, the telescopic main rod is lengthened as a whole by adding new standard drill rods. The lengthened height of the telescopic main rod pushes the U-shape of the wire saw upward, so that the wire saw can continue to cut upward until the designed cutting top height is reached.

[0014] Preferably, it further comprises a clamping mechanism, the clamping mechanism comprises a holding jack and a clamp, and the holding jack is installed on the supporting base; The clamp is connected to the top of the holding jack, and the clamp is used to clamp the assembly rod.

[0015] The assembly rod is clamped by a clamp, and then the assembly rod and the telescopic jack are separated, so that a new standard drill rod can be added to the assembly rod to lengthen the assembly rod as a whole.

[0016] Preferably, the clamping mechanism further comprises a clamping jack, and the clamping jack is used to control the clamping and releasing of the clamp.

[0017] Preferably, it also includes a spray pipeline, and the spray pipeline is used to spray water to the first redirecting wheel and the second redirecting wheel.

[0018] The present invention also discloses a method for cutting the top of a gob-side entry, using the cutting top equipment of the present invention, and further comprising the following steps: S1: Collect the tunnel data and design the roof cutting for the gob-side entry, then drill a hole in an area of ​​the roof to form a preset hole; S2: Install the support base according to the punching position of the top plate, then install the telescopic main rod and the guide wheel and the redirecting wheel, the top of the telescopic main rod is located in the hole of the top plate, then install the traction mechanism, and lay a walking track at the bottom of the traction mechanism, then install the rope saw, so that the rope saw passes around the guide wheel, the redirecting wheel and the driving wheel of the traction mechanism and forms a ring, and then move the traction mechanism through the walking track to initially tighten the rope saw; S3: performing a top cutting operation: controlling the driving wheel to rotate, the driving wheel drives the rope saw to circulate, and the rope saw is used to cut the top plate; Wherein, the traction mechanism moves away from the telescopic main rod through the walking track to provide tensioning force for the rope saw during the cutting process; S4: After the traction mechanism reaches the designed stroke, the traction mechanism is controlled to return to the initial position, the driving wheel is stopped from rotating, and then the telescopic main rod is extended, and step S3 is repeated to continue the top plate cutting operation until the top plate cutting of the area is completed; S5: Move the telescopic main rod, the traction mechanism and the rope saw to the next operation area, repeat steps S1-S4, and perform the top cutting operation in the next area.

[0019] The present invention discloses a roof cutting method for gob-side lane retention, which comprises the following steps: firstly, a hole is punched on the roof, and then a support base is installed according to the position of the hole in the roof, and then a telescopic main rod, a guide wheel and a redirecting wheel are installed, the top of the telescopic main rod is located in the hole of the roof, and then a traction mechanism is installed, and a walking track is laid at the bottom of the traction mechanism, and then a rope saw is installed, so that the rope saw passes around the guide wheel, the redirecting wheel and the driving wheel of the traction mechanism and forms a ring shape. When the roof cutting operation is performed, the driving wheel is controlled to rotate, and the driving wheel drives the rope saw to circulate, and the roof is cut by the rope saw, wherein the traction mechanism The guiding mechanism moves away from the telescopic main rod through the walking track to provide tensioning force for the rope saw during the cutting process. After the traction mechanism reaches the designed stroke, the traction mechanism is controlled to return to the initial position, the driving wheel is stopped, and then the telescopic main rod is extended. The above steps are repeated to continuously cut the roof until the roof cutting in this area is completed. The roof cutting method of the present invention is suitable for cutting the roof of the goaf-retained lane in underground coal mines, and solves the problems of excessive pressure when the goaf falls, damaging the roof of the goaf, causing difficult support, high investment, and high safety risks.

[0020] S5: Move the telescopic main rod, the traction mechanism and the rope saw to the next operation area, repeat steps S1-S4, and perform the top cutting operation in the next area. Preferably, in step S4, the telescopic main rod comprises an assembly rod and a telescopic jack connected to each other, and the assembly rod is pushed upward by controlling the extension of the telescopic jack; When the telescopic jack is extended to reach the stroke, the assembly rod is clamped by a clamp, and then the assembly rod is separated from the telescopic jack, and then the telescopic jack is operated to shrink, and then a new standard drill rod is added between the assembly rod and the telescopic jack.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The top cutting equipment described in the present application includes two relatively arranged telescopic main rods, each telescopic main rod top plate is provided with a redirecting wheel and a guide wheel is provided at the bottom, the rope saw passes around the driving wheel, the redirecting wheel and the guide wheel and surrounds the city in a ring shape, and then the driving wheel drives the rope saw to circulate, so that the rope saw can cut off the top plate in contact with it. When cutting the top, after the rope saw passes around the guide wheels and the top plate of the two telescopic main rods, the rope saw forms a U shape. During the top cutting process, the traction mechanism drives the driving wheel to move longitudinally, providing tensioning force for the rope saw, so that the rope saw gradually forms a straight shape from the U shape, so that the top plate in the area changing from the U shape to the straight shape is cut by the rope saw to realize the top cutting operation. The top cutting equipment of the present application provides a new equipment, which solves the problem of difficult top cutting in mines, avoids the uncontrollability of blasting pre-splitting top cutting, and realizes precise top cutting. Compared with top cutting with chain saw equipment, the equipment of the present application occupies a small space, does not require widening of the tunnel, and has lower investment.

[0022] 2. A method for cutting the roof of a gob-side lane retaining lane according to the present invention comprises the following steps: firstly, a hole is punched on the roof plate, and then a support base is installed according to the position of the hole in the roof plate, and then a telescopic main rod, a guide wheel and a redirecting wheel are installed, the top of the telescopic main rod is located in the hole of the roof plate, and then a traction mechanism is installed, and a walking track is laid at the bottom of the traction mechanism, and then a rope saw is installed, so that the rope saw passes around the guide wheel, the redirecting wheel and the driving wheel of the traction mechanism and forms a ring shape. When performing the roof cutting operation, the driving wheel is controlled to rotate, and the driving wheel drives the rope saw to circulate, and the roof plate is cut by the rope saw, wherein the traction mechanism The guiding mechanism moves away from the telescopic main rod through the walking track to provide tensioning force for the rope saw during the cutting process. After the traction mechanism reaches the designed stroke, the traction mechanism is controlled to return to the initial position, the driving wheel is stopped, and then the telescopic main rod is extended. The above steps are repeated to continuously cut the roof until the roof cutting in this area is completed. The roof cutting method of the present invention is suitable for cutting the roof of the goaf-retained lane in underground coal mines, and solves the problems of excessive pressure when the goaf falls, damaging the roof of the goaf, causing difficult support, high investment, and high safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the top cutting equipment of this application.

[0024] Figure 2 It is a schematic diagram of the coordination between the telescopic main rod and the clamping mechanism.

[0025] Figure 3 It is a structural schematic diagram of the telescopic main rod.

[0026] Figure 4 It is a schematic diagram of the top cutting equipment performing the top cutting operation. Figure 1 .

[0027] Figure 5 It is a schematic diagram of the top cutting equipment performing the top cutting operation. Figure 2 .

[0028] Figure 6 It is a schematic diagram of the top cutting equipment performing the top cutting operation. Figure 3 .

[0029] Figure 7 It is the schematic diagram of the top cutting operation.

[0030] Figure 8 It is a schematic diagram of the tunnel along the goaf.

[0031] Markings in the figure: 1-traction mechanism, 2-telescopic main rod, 21-assembly rod, 211-standard drill rod, 22-telescopic jack, 3-support base, 4-first redirecting wheel, 5-first guide wheel, 6-second redirecting wheel, 7-second guide wheel, 8-rope saw, 9-travel track, 10-clamping mechanism, 101-holding jack 101, 102-clamp, 103-clamping jack, 20-driving wheel, 30-spray pipe, 40-hole. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0033] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0035] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0036] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0037] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements. Example

[0038] like Figure 1-Figure 3 As shown, the top cutting equipment for gob-side lane retaining described in this embodiment comprises two telescopic main rods 2 arranged opposite to each other, a first redirecting wheel 4 is arranged on the top of one telescopic main rod 2 and a first guide wheel 5 is arranged on the bottom, and a second redirecting wheel 6 is arranged on the top of the other telescopic main rod 2 and a second guide wheel 7 is arranged on the bottom; It also includes a traction mechanism 1 and a rope saw 8. A driving wheel 20 is provided on the traction mechanism 1. The rope saw 8 passes through the driving wheel 20, the first guide wheel 5, the first redirecting wheel 4, the second redirecting wheel 6 and the second guide wheel 7 in sequence to form a ring. The driving wheel 20 is used to drive the rope saw 8 to circulate, and the traction mechanism 1 can drive the driving wheel 20 to move longitudinally.

[0039] like Figure 4-Figure 5 As shown, the driving wheel 20 drives the rope saw 8 to circulate, so that the rope saw 8 can cut off the top plate in contact with it. When cutting the top, the rope saw 8 bypasses the guide wheels and the top plate of the two telescopic main rods 2, and the rope saw 8 forms a U-shape. During the cutting process, the traction mechanism 1 drives the driving wheel 20 to move longitudinally, providing tensioning force for the rope saw 8, so that the rope saw 8 gradually changes from the U-shape to the straight shape, so that the top plate in the area changing from the U-shape to the straight shape is cut by the rope saw 8 to realize the cutting operation. The cutting equipment of this embodiment provides a new type of equipment, which solves the problem of difficult cutting of mine tops, avoids the uncontrollability of blasting pre-splitting cutting of tops, and realizes precise cutting of tops. Compared with cutting of tops by chain saw equipment, the equipment of this embodiment occupies a small space, does not need to widen the tunnel, and has a lower investment.

[0040] Among them, Figure 1 As shown, a first redirecting wheel 4 and a first guide wheel 5 are provided on the telescopic main rod 2 close to the traction mechanism 1, and a second redirecting wheel 6 and a second guide wheel 7 are provided on the telescopic main rod 2 away from the traction mechanism 1. The vertical height of the first redirecting wheel 4 is greater than the vertical height of the second redirecting wheel 6, and the heights of the first guide wheel 5 and the second guide wheel 7 are flush.

[0041] In one or more embodiments, Figure 1 As shown, it also includes a running track 9 , which is laid along the length direction of the laneway, and the traction mechanism 1 can move relatively on the running track 9 .

[0042] like Figure 5 As shown, the traction mechanism 1 can move relatively on the walking track 9, so that the traction machine 1 can move a certain distance on the walking track 9 to ensure that the rope saw 8 can maintain a certain tension during the top cutting operation, so that the rope saw 8 is tensioned to ensure the stability of the rope saw 8 during cutting. Furthermore, by applying tension to the rope saw 8, effective contact between the rope saw 8 and the top plate is ensured during the top cutting operation to ensure the normal progress of the top cutting operation.

[0043] The running track 9 is laid under the traction mechanism 1 , and the running track 9 is assembled in sections and can be disassembled and laid according to needs.

[0044] In one or more embodiments, Figure 3 As shown, the telescopic main rod 2 includes an assembly rod 21 and a telescopic jack 22 . The assembly rod 21 is connected to the top of the telescopic jack 22 . The telescopic jack 22 is used to lift the assembly rod 21 . The telescopic jack 22 is installed on the support base 3 .

[0045] like Figure 4 , Figure 5As shown, by extending the telescopic jack 22, the telescopic main rod 2 is extended as a whole, so that the U-shaped rope saw 8 is pushed upward, so that the rope saw 8 can cut upward all the way.

[0046] The supporting base 3 mainly supports the assembly rod 21 and the telescopic jack 22 , and the supporting base 3 needs to be anchored on the bottom plate.

[0047] In one or more embodiments, Figure 1 , Figure 2 As shown, it also includes a clamping mechanism 10, the clamping mechanism 10 includes a holding jack 101 and a clamp 102, and the holding jack 101 is installed on the support base 3; The clamp 102 is connected to the top of the holding jack 101 , and the clamp 102 is used for clamping the assembling rod 21 .

[0048] like Figure 6 As shown, the assembly rod 21 is clamped by the clamp 102, and then the assembly rod 21 and the telescopic jack 22 are separated, so as to facilitate the addition of a new standard drill rod 211 on the assembly rod 21 to lengthen the assembly rod 21 as a whole. The main function of the jack 101 is to provide a support for the upper assembly rod 21 when the standard drill rod 211 is added after the telescopic jack 22 reaches the maximum stroke.

[0049] In an optional embodiment, if Figure 2 As shown, the clamping mechanism 10 further includes a clamping jack 103 , and the clamping jack 103 is used to control the clamping and releasing of the clamp 102 .

[0050] In one or more embodiments, Figure 2 As shown, a spray pipeline 30 is also included, and the spray pipeline 30 is used to spray water to the first redirecting wheel 4 and the second redirecting wheel 6.

[0051] The spray pipeline 30 outputs high-pressure water spray to cool the wire saw 8 .

[0052] In one or several embodiments, the wire saw 8 is a diamond bead wire saw. Since the diamond bead wire saw is flexible, its direction can be changed according to the tunnel conditions. The wire saw 8 needs to form a loop through the driving wheel 20, the guide wheel, and the redirecting wheel. Driven by the driving wheel 20, it can reciprocate like a chain saw.

[0053] like Figure 7-Figure 8As shown, when the roof cutting equipment of this embodiment is used in the tunnel with lanes along the goaf, the roof is cut at an angle of 15° along the plumb line toward the working face, just above the coal wall side of the lane-retaining lane. The roof in area A above the goaf can fall smoothly without damaging area B above the lane to be retained. The problem of the roof in area B being damaged by the strong pressure when area A falls can be solved. The intact roof in area B can better protect the lane-retaining lane. At the same time, the intact roof in area B can achieve relatively simple and low-cost support to meet safety requirements. Example

[0054] like Figure 4-Figure 6 As shown, based on Example 1, this embodiment discloses a method for cutting the top of a gob-side entry, using the cutting top equipment described in Example 1, and further comprising the following steps: S1: collecting tunnel data and designing the top cutting of the gob-side tunnel, and then drilling a hole in an area of ​​the top plate to form a preset hole 40; S2: Install the support base 3 according to the punching position of the top plate, then install the telescopic main rod 2 and the guide wheel and the redirecting wheel, the top of the telescopic main rod 2 is located in the hole 40 of the top plate, then install the traction mechanism 1, and lay the walking track 9 at the bottom of the traction mechanism 1, and then install the rope saw 8, so that the rope saw 8 passes around the driving wheel 20, the guide wheel and the redirecting wheel to form a ring, and then move the traction mechanism 1 through the walking track 9 to initially tighten the rope saw 8; S3: performing top cutting operation: controlling the driving wheel 20 to rotate, the driving wheel 20 drives the rope saw 8 to circulate, and the rope saw 8 is used to cut the top plate; The traction mechanism 1 moves away from the telescopic main rod 2 through the travel track 9, providing tension for the rope saw 8 during the cutting process; S4: After the traction mechanism 1 reaches the designed stroke, the traction mechanism 1 is controlled to return to the initial position, the driving wheel 20 is stopped from rotating, and then the telescopic main rod 2 is extended, and step S3 is repeated to continue the top plate cutting operation until the top plate cutting in the area is completed; S5: Remove the telescopic main rod 2, the traction mechanism 1 and the rope saw 8, and then go to the next working area, repeat steps S1-S4, and perform the top cutting operation in the next area.

[0055] The roof cutting method of the present invention is suitable for cutting the roof of the goaf-retained lane in underground coal mines, and solves the problems of excessive pressure when the goaf falls, damaging the roof of the goaf, causing difficult support, high investment, and high safety risks.

[0056] In step S4, Figure 6 As shown, the telescopic main rod 2 includes an assembly rod 21 and a telescopic jack 22 that are connected to each other, and the assembly rod 21 is pushed upward by controlling the extension of the telescopic jack 22; When the telescopic jack 22 is extended to a certain stroke, the assembly rod 21 is clamped by the clamp 102 , and then the assembly rod 21 and the telescopic jack 22 are separated, and then the telescopic jack 22 is operated to retract, and then a new standard drill rod 211 is added between the assembly rod 21 and the telescopic jack 22 . Example

[0057] Based on Example 2, this example discloses a method for cutting the top of a gob-side tunnel, which is a preferred method in actual construction. The specific steps are as follows: Step 1: Drill holes in the roof to prepare for the later support of the telescopic main rod 2. Collect data and cut the top design of the gob-side tunnel, and determine the drilling depth and drilling step. Drill holes along the tunnel, just above the working face, about 300mm away from the coal wall, at an angle of 15° to the vertical direction.

[0058] The drilling can be completed by using a general-purpose drilling rig, a drill rod and a step drill bit. Through experimental comparison, the drilling size is Φ200mm and the drilling step is 5000~6000mm, which is appropriate. It can also be specifically designed according to the roof conditions of the reserved laneway. When the top cutting depth is shallow, the drilling step can be appropriately increased.

[0059] Step 2: Installation and arrangement of top cutting equipment underground. First, install the support base 3 according to the drilling position of the top plate, ensure that the axis of the telescopic jack 22 is in line with the drilling axis, and fix the support base 3 with an anchor cable after alignment; then install the telescopic jack 22, the holding jack 101, the clamp 102, the clamping jack 103, and the redirecting wheel; then install the guide wheel and the traction mechanism 1. Ensure that the rope saw 8 can smoothly bypass the driving wheel, guide wheel, and redirecting wheel of the traction mechanism 1, and will not jump or fall off the rope after the initial tightening of the rope saw 8. Through ground tests, it is more appropriate to install the traction mechanism 1 at a position 10 to 15 meters away from the first drill hole in the top plate, which can realize real-time operation of the traction mechanism 1 and better observe the cutting situation. Then install the rope saw 8. When installing the rope saw 8, pay attention to the direction of the cutting edge. The length of the rope saw 8 can be connected by a standard joint. Finally, install the spray pipeline 30, which is used to spray water to the redirecting wheel.

[0060] Step 3: Cutting operation. After the above equipment is correctly installed, check the power supply (traction mechanism 1), water source (spray pipe 30) and emulsion source (jack). Start the traction mechanism 1, open the spray pipe 30, start the walking program of the traction mechanism 1, control the rotation of the driving wheel 20, and the driving wheel 20 drives the rope saw 8 to circulate. The top plate is cut by the rope saw 8. The traction mechanism 1 moves away from the telescopic main rod 2 through the walking track 9 to provide tension for the rope saw 8 during the cutting process to perform the cutting work.

[0061] After the traction mechanism 1 reaches the designed stroke, it stops moving and stops the driving wheel 20 from rotating, and the return program of the traction mechanism 1 is started. The traction mechanism 1 is controlled to return to the initial position, and at the same time, the telescopic jack 22 is operated to lift the assembly rod 21 to push the telescopic main rod 2 upward. At this time, due to the locking relationship, the jack 101 will also extend with the telescopic jack 22. When the telescopic jack 22 reaches the stroke, operate the clamping jack 103 to make the clamp 102 clamp the assembly rod 21, then disengage the assembly rod 21 and the telescopic jack 22, operate the telescopic jack 22 to retract, and keep the jack 103 in a high position; add a new standard drill rod 211, connect it to the high-position assembly rod 21 and the telescopic jack 22 below; operate the clamping jack 103 to make the clamp 102 loosen the high-position assembly rod 21, then operate the holding jack 101 to retract, make the clamp 102 drop to the middle and lower part of the newly added standard drill rod 211, and then operate the clamping jack 103 to make the clamp 102 clamp the newly added standard drill rod 211. The lifting and advancing operation steps of the two telescopic main rods 2 are the same, and both telescopic main rods 2 add a standard drill rod 211, and then a top cutting and advancing work is completed. Then start the traction mechanism 1, open the spray pipe 30, start the walking program of the traction mechanism 1, and carry out the next cutting work. Calculated as the top plate cutting depth of 10 meters, the above operation needs to be repeated about 14 times. When the cutting depth reaches the design requirement, each section of the standard drill rod 211 is removed until the telescopic main rod 2 is completely removed, and then other removal work of the top cutting equipment is carried out. First, the telescopic jack 22, the holding jack 101, the clamp 102, the clamping jack 103, etc. installed on the support base 3 are removed. And the equipment is moved to the next top cutting section (adjacent section); repeat the second and third steps to carry out the top cutting work of the next section.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A top cutting equipment for gob-side entry retention, characterized in that: It comprises two telescopic main rods (2) arranged opposite to each other, one of the telescopic main rods (2) having a first redirecting wheel (4) at the top and a first guide wheel (5) at the bottom, and the other telescopic main rod (2) having a second redirecting wheel (6) at the top and a second guide wheel (7) at the bottom; It also comprises a traction mechanism (1) and a rope saw (8), wherein the traction mechanism (1) is provided with a driving wheel (20), the rope saw (8) sequentially passes around the driving wheel (20), the first guide wheel (5), the first redirecting wheel (4), the second redirecting wheel (6) and the second guide wheel (7) to form a ring, the driving wheel (20) is used to drive the rope saw (8) to move in a circular motion, and the traction mechanism (1) can drive the driving wheel (20) to move longitudinally.

2. The top cutting equipment for gob-side entry retaining according to claim 1 is characterized in that: It also comprises a running track (9), wherein the running track (9) is laid along the length direction of the laneway, and the traction mechanism (1) is capable of relatively moving on the running track (9).

3. The top cutting equipment for gob-side entry retaining according to claim 1 is characterized in that: The telescopic main rod (2) comprises an assembly rod (21) and a telescopic jack (22); the assembly rod (21) is connected to the top of the telescopic jack (22); the telescopic jack (22) is used to lift the assembly rod (21); and the telescopic jack (22) is mounted on a support base (3).

4. The top cutting equipment for gob-side entry retaining according to claim 3 is characterized in that: The assembly rod (21) is composed of a plurality of sections of standard drill rods (211), and adjacent standard drill rods (211) are detachably connected.

5. The top cutting equipment for gob-side entry retaining according to claim 3 is characterized in that: It also comprises a clamping mechanism (10), the clamping mechanism (10) comprising a holding jack (101) and a clamp (102), the holding jack (101) being mounted on the supporting base (3); The clamp (102) is connected to the top of the retaining jack (101), and the clamp (102) is used to clamp the assembly rod (21).

6. The top cutting equipment for gob-side entry retaining according to claim 5, characterized in that: The clamping mechanism (10) further comprises a clamping jack (103), wherein the clamping jack (103) is used to control the clamping and releasing of the clamp (102).

7. The top cutting equipment for gob-side entry retention according to claim 1 is characterized in that: It also comprises a spray pipeline (30), wherein the spray pipeline (30) is used to spray water toward the first redirecting wheel (4) and the second redirecting wheel (6).

8. A method for cutting the top of a gob-side entry, characterized in that: Using the topping equipment according to any one of claims 1 to 7, further comprising the following steps: S1: Collecting tunnel data and designing the roof cut for the gob-side tunnel, and then drilling a hole in an area of ​​the roof to form a preset hole (40); S2: installing the support base (3) according to the punching position of the top plate, then installing the telescopic main rod (2) and the guide wheel and the redirecting wheel, the top of the telescopic main rod (2) is located in the hole (40) of the top plate, then installing the traction mechanism (1), laying a walking track (9) at the bottom of the traction mechanism (1), then installing the rope saw (8), making the rope saw (8) pass around the driving wheel (20), the guide wheel and the redirecting wheel to form a ring, and then moving the traction mechanism (1) through the walking track (9) to initially tighten the rope saw (8); S3: performing a top cutting operation: controlling the driving wheel (20) to rotate, the driving wheel (20) driving the rope saw (8) to circulate, and the rope saw (8) is used to cut the top plate; The traction mechanism (1) moves in a direction away from the telescopic main rod (2) via the walking track (9), thereby providing tensioning force for the rope saw (8) during the cutting process; S4: After the traction mechanism (1) reaches the designed stroke, the traction mechanism (1) is controlled to return to the initial position, the driving wheel (20) is stopped from rotating, and then the telescopic main rod (2) is extended, and step S3 is repeated to continue the top plate cutting operation until the top plate cutting of the area is completed; S5: dismantling the telescopic main rod (2), the traction mechanism (1) and the rope saw (8), and then proceeding to the next operation area, repeating steps S1 to S4, and performing the top cutting operation in the next area.

9. A method for cutting the top of a gob-side entry according to claim 8, characterized in that: In step S4, the telescopic main rod (2) comprises an assembly rod (21) and a telescopic jack (22) which are connected to each other, and the assembly rod (21) is pushed upward by controlling the telescopic jack (22) to extend; When the telescopic jack (22) is extended to reach the stroke, the assembly rod (21) is clamped by a clamp (102), and then the assembly rod (21) and the telescopic jack (22) are separated, and then the telescopic jack (22) is operated to retract, and then a new standard drill rod (211) is added between the assembly rod (21) and the telescopic jack (22).

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