Gap cutting device for coal seam gas control

Abstract

The utility model relates to a seam cutting device for coal seam gas control, which comprises two walking driving mechanisms, the two walking driving mechanisms are in transmission connection through an annular saw chain, a walking platform and a driving device are arranged on the walking driving mechanisms, and a chain plate platform and a guide device are arranged on the walking platform. The guide device comprises two lifting guide columns, two guide columns, a first horizontal guide rail and a second horizontal guide rail; two leveling oil cylinders of which the moving ends are hinged to the lower part of the chain plate platform are arranged on the walking platform; the first horizontal guide rail and the second horizontal guide rail are hinged to bases. The chain plate platform is reasonable in structural design, the chain plate platform is matched with the leveling oil cylinders arranged at the front end and the rear end of the advancing direction to form a stable platform, the telescopic height of the leveling oil cylinders and the coal seam cutting angle are adjusted in time according to the coal seam environment detected in advance in the advancing process, and part of coal seams inconvenient to cut are avoided in time; and the working efficiency of coal seam joint cutting gas discharge is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coal mine gas control, especially a gap cutting device for coal seam gas control. BACKGROUND

[0002] The most common means of coal seam gas control in underground coal mines in China is to arrange dense boreholes, introduce negative pressure pipelines after sealing the boreholes, and use the negative pressure pipelines to extract the gas stored in the coal seam, thereby reducing the gas concentration in the coal seam and ensuring production safety during the later mining process. The existing drilling method mainly arranges dense boreholes to form multiple holes connected with the roadway in the coal seam, and arranges a hole sealer in each hole, and the extraction holes of the hole sealers and the negative pressure pipelines form a negative pressure pipeline network for gas extraction.

[0003] The Chinese patent document with the authorized announcement number CN217681718U discloses a synchronous walking chain plate type coal seam cutting device, which includes a chain plate type circulating digging knife across the coal seam and a walking driving mechanism in the two side roadways. The walking driving mechanism includes a walking platform, a driving motor or hydraulic motor, and a driving box. The driving motor or hydraulic motor is installed on the walking platform, and its output shaft is connected with the driving wheel. The chain plate type circulating digging knife is sleeved on the driving wheels on both sides. This device changes the existing gas control process, reduces the workload of underground tunneling, and has the characteristics of simple structure, convenient coal seam gas extraction, and improved safety.

[0004] However, the existing coal seam cutting device mostly follows the straight cutting in the roadway, and the cutting tool can only form a narrow gap. The cutting surface will deviate when following the undulating ground surface of the roadway. Moreover, the environment is complex and the geological conditions are different at different positions of the coal seam. The cutting surface cannot be adjusted in time during the marching process, the gas discharge efficiency is low, and the device working efficiency is affected. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a gap cutting device for coal seam gas control, which solves the problem of the existing coal seam cutting device that only forms a cutting surface following the undulating ground surface of the roadway, the cutting tool can only form a narrow gap, the environment is complex and the geological conditions are different at different positions of the coal seam, obstacles affecting the coal seam cutting efficiency easily occur during the marching process, the gas discharge efficiency is low, and the device working efficiency is affected.

[0006] In order to solve the above problems, the utility model provides a kind of for coal seam gas control gap cutting device, including two synchronous coordination work's walking driving mechanism, two the walking driving mechanism is arranged in the roadway of coal seam two sides respectively, two the walking driving mechanism is connected by annular saw chain transmission, walking platform is equipped on the walking driving mechanism, the driving device of driving the saw chain rotation, walking platform is equipped with the chain plate platform of height adjustable, the guide device of supporting the chain plate platform;The guide device includes two end fixed on the walking platform lifting guide column, two interval settings and end articulated on the walking platform guide column, two ends sliding connection in two lifting guide column first horizontal guide rail, two ends sliding connection in two guide column second horizontal guide rail;Walking platform is equipped with the two leveling oil cylinder of mobile end articulated in the lower part of chain plate platform;First horizontal guide rail with the second horizontal guide rail all be equipped with the hinged seat of articulation with the bottom of chain plate platform.

[0007] The utility model provides a kind of for coal seam gas control gap cutting device, still have following technical features:

[0008] Further, the bottom of the chain plate platform is provided with two first hinged seats articulated on the first horizontal guide rail; the bottom of the chain plate platform is provided with two second hinged seats articulated on the second horizontal guide rail; one end of the leveling oil cylinder is articulated between the two first hinged seats, and the other end of the leveling oil cylinder is articulated between the two second hinged seats.

[0009] Further, the saw chain includes a plurality of cutting knives for cutting coal seams, and a series of chain rings connecting adjacent two cutting knives; the series of chain rings and the cutting knives are alternately staggered; the driving device output shaft is provided with a driving sprocket for driving the saw chain to rotate; the driving sprocket is provided with a nest groove engaged with the cutting knife; adjacent two nest grooves are provided with a connecting groove for inserting the series of chain rings; the saw chain close to the coal seam side is a front chain, and the saw chain away from the coal seam side is a rear chain.

[0010] Further, the cutting knife includes a knife seat chain ring and an arc-shaped knife seat fixed on the knife seat chain ring; the knife seat is provided with a plurality of spaced-apart knife heads; the knife seat is arranged on the side of the knife seat chain ring away from the driving sprocket.

[0011] Further, the knife seat chain ring and the series of chain rings are linear; adjacent the knife seat chain ring and the series of chain rings form a cross shape.

[0012] Further, the walking driving mechanism is provided with an isolation device for separating the front chain and the rear chain; the isolation device comprises a pulling column arranged on the walking driving mechanism, a pulling rope connected to the two pulling columns respectively at two ends, and a sleeve arranged outside the pulling rope; the sleeve comprises a plurality of connecting pipes connected in sequence by universal joints.

[0013] Further, the sleeve is provided with a plurality of guide rail frames arranged at intervals on one side close to the front chain; the guide rail frame is designed in a U shape opening towards the front chain; the guide rail frame guides the stable transmission of the side of the series connection chain ring.

[0014] Further, gaps are arranged between adjacent connecting pipes and communicate inside and outside; the walking driving mechanism is provided with a water pump communicating with a water source and a pipeline communicating between the water pump and the sleeve; one end of the pipeline is inserted into the gap between the sleeve and the pulling rope to inject water into the inside.

[0015] Further, the plurality of connecting pipes are connected in sequence by petal-shaped universal shafts; one end of the connecting pipe is provided with at least six petals; the connecting pipe on the side is spot-welded to the outer wall of the pulling rope.

[0016] The utility model has the advantages of reasonable structure design, simple structure, chain plate platform connected with two horizontal guide rails, leveling oil cylinders arranged at the front and rear ends of the advancing direction, stable chain plate platform, timely adjustment of the extension height of the leveling oil cylinder according to the coal seam environment detected in advance during the advancing process of the walking driving mechanism, adjustment of the angle of cutting the coal seam, timely avoidance of part of the coal seam inconvenient to cut, effective improvement of the work efficiency of the coal seam cutting seam gas discharge, sufficient power drive of the saw chain formed by the driving sprocket with the nest groove and the matching cutter holder chain ring, special chain ring structure ensuring sufficient saw chain strength, and realization of the cutting of the coal seam with sufficient width gap, ensuring that the gap formed after cutting is sufficient for the release of gas, arc-shaped cutter holder, special chain ring structure formed by the cutter holder chain ring, sufficient main body strength and saw chain thickness, efficient cutting operation, and improvement of the efficiency of cutting coal block debris discharge. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the utility model embodiment;

[0018] Figure 2 It is a structure schematic view of the walking driving mechanism of the utility model embodiment;

[0019] Figure 3 It is a structure schematic view of the guiding device of the utility model embodiment;

[0020] Figure 4 It is a structure schematic view of the saw chain of the utility model embodiment;

[0021] Figure 5 This is a schematic diagram of the isolation device according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the saw chain structure according to an embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of the saw chain component according to an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the drive sprocket structure according to an embodiment of the present invention;

[0025] In the diagram: 1-Walking drive mechanism, 11-Walking platform, 2-Saw chain, 21-Series link, 22-Cutting blade, 221-Tool holder link, 222-Tool holder, 223-Cut head, 23-Front chain, 24-Rear chain, 3-Chain plate platform, 31-First hinge, 32-Second hinge, 4-Guiding device, 41-Lifting guide column, 42-Guide column, 43-First horizontal guide rail, 44-Second horizontal guide rail, 5-Leveling cylinder, 6-Drive sprocket, 61-Groove, 62-Connecting groove, 7-Isolation device, 71-Torture rope, 72-Sleeve, 721-Guide rail frame, 73-Connecting pipe, 74-Torture column, 8-Drive device. Detailed Implementation

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0027] like Figures 1 to 8In one embodiment of the coal seam gas control gap cutting device of this utility model, two synchronously coordinated walking drive mechanisms 1 are provided. The two walking drive mechanisms 1 are respectively arranged in the roadways on both sides of the coal seam. The two walking drive mechanisms 1 are connected by a ring saw chain 2. The walking drive mechanism 1 is provided with a walking platform 11 and a drive device 8 for driving the saw chain 2 to rotate. The walking platform 11 is provided with a height-adjustable chain plate platform 3 and a guide device 4 for supporting the chain plate platform 3. The guide device 4 includes two lifting guide columns 41 with their ends fixed on the walking platform 11, two guide columns 42 that are spaced apart and hinged to the walking platform 11 at their ends, a first horizontal guide rail 43 that is slidably connected to the two lifting guide columns 41 at both ends, and a second horizontal guide rail 44 that is slidably connected to the two guide columns 42 at both ends. The walking platform 11 is provided with two leveling cylinders 5 whose moving ends are hinged to the lower part of the chain plate platform 3. The first horizontal guide rail 43 and the second horizontal guide rail 44 are both provided with hinge seats that are hinged to the bottom of the chain plate platform 3. The chain plate platform, which is hinged to two horizontal guide rails, and the leveling cylinders set at the front and rear ends of the travel direction, form a stable chain plate platform. During the forward movement of the walking drive mechanism, the extension and retraction height of the leveling cylinders are adjusted in a timely manner according to the pre-detected coal seam environment, and the angle of cutting the coal seam is adjusted to avoid some coal seams that are inconvenient to cut, thus effectively improving the working efficiency of coal seam cutting and gas discharge.

[0028] Specifically, the bottom of the chain plate platform 3 is provided with two first hinge seats 31 that are hinged at intervals on the first horizontal guide rail 43; the bottom of the chain plate platform 3 is provided with two second hinge seats 32 that are hinged at intervals on the second horizontal guide rail 44; the end of one leveling cylinder 5 is hinged between the two first hinge seats 31, and the end of another leveling cylinder 5 is hinged between the two second hinge seats 32.

[0029] Specifically, the saw chain 2 includes multiple cutting blades 22 for cutting coal seams and a series link 21 connecting two adjacent cutting blades 22; the series link 21 and the cutting blades 22 are arranged in an alternating pattern; the output shaft of the drive device 8 is equipped with a drive sprocket 6 that drives the saw chain 2 to rotate; the drive sprocket 6 is equipped with a groove 61 that meshes with the cutting blades 22; a connecting groove 62 is provided between two adjacent grooves 61, which is just enough for the series link 21 to be inserted; the saw chain 2 closer to the coal seam is the front chain 23, and the saw chain 2 farther away from the coal seam is the rear chain 24. The rotating saw chain, driven by a chain plate platform with adjustable height and deflection angle, adjusts the cutting position in a timely manner. The drive device provides sufficient power to drive the saw chain to rotate, cutting the coal seam to form a smooth and continuous cutting slit, avoiding direct contact between the saw chain and the complex geological coal seam, and ensuring high cutting efficiency.

[0030] Specifically, the cutting tool 22 includes a tool holder chain link 221 and an arc-shaped tool holder 222 fixed on the tool holder chain link 221; the tool holder 222 is provided with multiple spaced-apart cutter heads 223; the tool holder 222 is located on the side of the tool holder chain link 221 away from the drive sprocket 6. The arc-shaped tool holder, in conjunction with the tool holder chain link, forms a specially designed chain structure, ensuring sufficient main body strength and saw chain thickness to achieve highly efficient slit opening operation and improve the efficiency of removing coal chunks and debris.

[0031] Specifically, both the tool holder chain link 221 and the connecting chain link 21 are straight; adjacent tool holder chain links 221 and connecting chain links 21 form a cross shape.

[0032] Specifically, the walking drive mechanism 1 is equipped with an isolation device 7 that separates the front chain 23 and the rear chain 24. The isolation device 7 includes a towing column 74 installed on the walking drive mechanism 1, a traction rope 71 with its two ends connected to the two towing columns 74 respectively, and a sleeve 72 sleeved over the traction rope 71. The sleeve 72 includes multiple connecting tubes 73 that are connected in a series of universal joints. By sleeved over the traction rope with a sleeve formed by multiple petal-shaped universal joint connecting tubes, the overall flexibility is maintained and a certain strength is achieved without the use of elastic materials. This reduces the safety hazard caused by the saw chain breaking, fully isolates the front chain and the rear chain, and reduces the risk of the front chain and the rear chain colliding and entangled during travel, affecting the operation of the equipment.

[0033] Specifically, the sleeve 72 has multiple spaced guide rails 721 on the side near the front chain 23; the guide rails 721 have a U-shaped design with openings facing the front chain 23; the guide rails 721 guide the stable transmission of the side of the serial chain links 21.

[0034] Specifically, there is a gap between adjacent connecting pipes 73 to connect the inside and outside; the walking drive mechanism 1 is equipped with a water pump connected to the water source and a pipe connecting the water pump and the sleeve 72; one end of the pipe is inserted into the gap between the sleeve 72 and the towing rope 71 to inject water into the interior.

[0035] Specifically, multiple connecting tubes 73 are sequentially hinged by petal-shaped universal joints; one end of the connecting tube 73 is provided with at least 6 petals; the side connecting tubes 73 are spot-welded to the outer wall of the traction rope 71.

[0036] The drive unit 8 is a drive motor or a hydraulic motor.

[0037] Working principle: Two walking drive mechanisms 1 enter the pre-excavated roadways, and the two roadways are pre-connected by a drilling device. The saw chain 2 is passed through the hole and installed on the drive sprocket 6 driven by the drive device 8 on the walking drive mechanism 1. The cutter holder chain link 221 is precisely installed in the slot 61. The drive sprocket 6 provides sufficient power to drive the saw chain 2 and ensures sufficient strength of the saw chain 2, enabling the cutting of a sufficiently wide gap in the coal seam, ensuring that a sufficient gap is formed after cutting for the release of methane gas. When the equipment is in use, the equipment is started, and the walking drive mechanism 1 works with the coal seam to tension the saw chain 2. The drive sprocket 6 drives the saw chain 2 forward, and the arc-shaped cutter holder 222, together with the alloy cutter head 223, fully cuts the coal seam, achieving high-efficiency slit opening operation. During the movement, the extension and retraction height of the two leveling cylinders 5 is adjusted in a timely manner according to the detected coal seam environment. Through the different extension and retraction heights of the two leveling cylinders 5, the chain plate platform 3 is driven to level and lift. The saw chain can be lowered or tilted to adjust the angle of the coal seam being cut, thereby adjusting the cutting path. The arc-shaped cutter holder 222, together with the cutter holder chain link 221, forms a specially designed chain link structure, ensuring sufficient main body strength and facilitating the discharge of debris from the coal seam being cut. During the coal seam cutting process, the drag column 74 on the walking drive mechanism 1 simultaneously drives the isolation device 7 placed between the front chain 23 and the rear chain 24 to move synchronously. Multiple petal-shaped universal hinged connecting pipes 73 are sleeved on the outside of the traction rope 71, retaining overall flexibility and a certain strength without the use of elastic materials, reducing the safety hazard caused by the breakage of the saw chain 2. The front chain 23 and the rear chain 24 are fully isolated, reducing the risk of collision and entanglement between the front chain 23 and the rear chain 24 during the movement, which affects the operation of the equipment. In addition, the gaps in the petal-shaped hinge shaft guide the water flow injected into the gap between the connecting pipe 73 and the traction rope 71 to flow out, providing uniform wet cooling to multiple parts of the saw chain in the coal seam, ensuring the cooling efficiency of the saw chain 2.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A slot cutting device for coal seam gas control, comprising two synchronously coordinated walking drive mechanisms (1), the two walking drive mechanisms (1) being respectively arranged in roadways on both sides of the coal seam, the two walking drive mechanisms (1) being connected by a ring saw chain (2), each walking drive mechanism (1) being provided with a walking platform (11) and a drive device (8) for driving the saw chain (2) to rotate, characterized in that: The walking platform (11) is provided with a height-adjustable chain plate platform (3) and a guide device (4) supporting the chain plate platform (3); the guide device (4) includes two lifting guide columns (41) with their ends fixed on the walking platform (11), two guide columns (42) spaced apart and hinged at their ends on the walking platform (11), a first horizontal guide rail (43) with its two ends slidably connected to the two lifting guide columns (41), and a second horizontal guide rail (44) with its two ends slidably connected to the two guide columns (42); the walking platform (11) is provided with two leveling cylinders (5) with their moving ends hinged to the lower part of the chain plate platform (3); the first horizontal guide rail (43) and the second horizontal guide rail (44) are both provided with hinge seats that are hinged to the bottom of the chain plate platform (3).

2. The slot cutting device for coal seam gas control according to claim 1, characterized in that: The bottom of the chain plate platform (3) is provided with two first hinge seats (31) that are hinged at intervals on the first horizontal guide rail (43); the bottom of the chain plate platform (3) is provided with two second hinge seats (32) that are hinged at intervals on the second horizontal guide rail (44); one of the leveling cylinders (5) is hinged at the end between the two first hinge seats (31), and the other of the leveling cylinders (5) is hinged at the end between the two second hinge seats (32).

3. The slot cutting device for coal seam gas control according to claim 1, characterized in that: The saw chain (2) includes multiple cutting blades (22) for cutting coal seams and a series link (21) connecting two adjacent cutting blades (22); the series link (21) and the cutting blades (22) are arranged in an alternating pattern; the output shaft of the drive device (8) is provided with a drive sprocket (6) that drives the saw chain (2) to rotate; the drive sprocket (6) is provided with a groove (61) that meshes with the cutting blades (22); a connecting groove (62) is provided between two adjacent grooves (61) that allows the series link (21) to be inserted; the saw chain (2) closer to the coal seam is the front chain (23), and the saw chain (2) farther away from the coal seam is the rear chain (24).

4. The slot cutting device for coal seam gas control according to claim 3, characterized in that: The cutting tool (22) includes a tool holder chain link (221) and an arc-shaped tool holder (222) fixed on the tool holder chain link (221); the tool holder (222) is provided with a plurality of spaced-apart cutter heads (223); the tool holder (222) is located on the side of the tool holder chain link (221) away from the drive sprocket (6).

5. The slot cutting device for coal seam gas control according to claim 4, characterized in that: Both the tool holder chain link (221) and the connecting chain link (21) are straight; adjacent tool holder chain links (221) and connecting chain links (21) form a cross shape.

6. The slot cutting device for coal seam gas control according to claim 3, characterized in that: The walking drive mechanism (1) is provided with an isolation device (7) to separate the front chain (23) and the rear chain (24); the isolation device (7) includes a towing column (74) provided on the walking drive mechanism (1), a traction rope (71) with both ends connected to the two towing columns (74) respectively, and a sleeve (72) sleeved on the traction rope (71); the sleeve (72) includes a plurality of connecting pipes (73) that are hinged in a series.

7. The slot cutting device for coal seam gas control according to claim 6, characterized in that: The sleeve (72) is provided with a plurality of spaced guide rails (721) on the side near the front chain (23); the guide rails (721) are U-shaped with openings facing the front chain (23); the guide rails (721) guide the side of the serial chain link (21) to drive stably.

8. The slot cutting device for coal seam gas control according to claim 6, characterized in that: A gap is provided between adjacent connecting pipes (73) to connect their inside and outside; the walking drive mechanism (1) is provided with a water pump connected to the water source and a pipeline connecting the water pump and the sleeve (72); one end of the pipeline is inserted into the gap between the sleeve (72) and the towing rope (71) to inject water into the interior.

9. The slot cutting device for coal seam gas control according to claim 6, characterized in that: Multiple connecting tubes (73) are sequentially hinged by petal-shaped universal joints; one end of each connecting tube (73) is provided with at least 6 petals; the connecting tubes (73) on the side are spot-welded to the outer wall of the traction rope (71).

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