Special saw chain for geological cutting of coal seam

Abstract

The invention relates to a special saw chain for geological cutting of a coal seam, the ends of the special saw chain are respectively mounted on two walking driving mechanisms crossing the coal seam, a driving device is arranged on each walking driving mechanism, and the saw chain comprises a plurality of cutters and a serial chain ring; the tandem chain rings and the cutters are sequentially staggered; a driving chain wheel is arranged on an output shaft of the driving device; a nest groove meshed with the cutting knife is formed in the driving chain wheel; a connecting groove which is just used for inserting a serial chain ring is formed between every two adjacent nest grooves; the saw chain close to the coal seam side is a front chain, and the saw chain far away from the coal seam side is a rear chain. The device is reasonable in structural design, the driving chain wheel with the nest groove is matched with the meshed tool apron chain ring to form sufficient power drive for the saw chain, sufficient saw chain strength is guaranteed through the special chain ring structure, cutting of seams with sufficient width in a coal seam is achieved, and it is guaranteed that sufficient seams are formed after cutting so that gas can be released.

Description

Technical Field

[0001] The invention relates to the field of coal mine gas control, in particular to a special saw chain for coal seam geological cutting. Background Art

[0002] The most common method of coal seam gas control in my country's coal mines is to arrange dense boreholes, introduce negative pressure pipes after blocking the boreholes, and use the negative pressure pipes to extract the gas stored in the coal seam, thereby reducing the gas concentration in the coal seam and ensuring production safety in the later mining process of the coal seam. The existing drilling methods mostly adopt dense boreholes to form multiple holes connected to the tunnels in the coal seam, and arrange sealers in each hole. The drainage holes of each sealer are connected to the negative pressure pipe to form a negative pressure pipe network for gas extraction.

[0003] The Chinese patent document with authorization announcement number CN217681718U discloses a synchronous walking chain plate type coal seam cutting device, including a chain plate type circulating digging cutter across the coal seam and a walking drive mechanism located in the tunnels on both sides. The walking drive mechanism includes a walking platform, a driving motor or a hydraulic motor and a driving box. The driving motor or the hydraulic motor is installed on the walking platform, and its output shaft is connected to the driving wheel by transmission; the chain plate type circulating digging cutter is mounted on the driving wheels on both sides, which changes the existing gas control process and reduces the workload of underground tunnel excavation. The equipment has the characteristics of simple structure, convenient extraction of coal seam gas and improved safety.

[0004] However, the existing coal seam cutting saw chains are short in length and poor in strength. They are easily broken during use, affecting the construction progress and having high maintenance costs. In addition, the seam size is small and cannot meet the demand for full gas release. Moreover, most of them are suitable for hard body cutting. The actual coal seam address environment is complex and prone to soft and low-hardness geological environments. It is difficult for existing equipment to open seams in coal seams with low-hardness and soft geological layers. Summary of the invention

[0005] The object of the present invention is to provide a special saw chain for coal seam geological cutting, so as to solve the above-mentioned problems and realize a more efficient coal seam opening operation.

[0006] In order to solve the above problems, the present invention provides a special saw chain for coal seam geological cutting, the ends of which are respectively installed on two travel drive mechanisms spanning the coal seam, the travel drive mechanism is provided with a driving device for driving the saw chain to rotate, the saw chain includes a plurality of cutting knives for cutting the coal seam, and a series chain ring connecting two adjacent cutting knives; the series chain ring and the cutting knives are staggered in sequence; a driving sprocket for driving the saw chain to rotate is provided on the output shaft of the driving device; a groove meshing with the cutting knives is provided on the driving sprocket; a connecting groove is provided between two adjacent grooves for the series chain ring to be inserted; the saw chain on the side close to the coal seam is the front chain, and the saw chain on the side away from the coal seam is the rear chain.

[0007] The special saw chain for coal seam geological cutting provided by the present invention also has the following technical features: Furthermore, the cutting tool comprises a tool holder chain ring and an arc-shaped tool holder fixed on the tool holder chain ring; a plurality of tool heads arranged at intervals are arranged on the tool holder; and the tool holder is arranged on a side of the tool holder chain ring away from the driving sprocket.

[0008] Furthermore, the cutter head is made of diamond alloy.

[0009] Furthermore, the knife seat chain ring and the series-connected chain ring are both in a straight line shape; and the adjacent knife seat chain rings and the series-connected chain rings form a cross shape.

[0010] Furthermore, an isolation device for separating the front chain and the rear chain is provided on the travel drive mechanism; the isolation device includes a traction column arranged on the travel drive mechanism, a traction rope with two ends respectively connected to the two traction columns, and a sleeve arranged outside the traction rope; the sleeve includes a plurality of connecting tubes which are universally hinged in sequence.

[0011] Furthermore, a plurality of guide rail frames arranged at intervals are provided on one side of the sleeve close to the front chain; the guide rail frame is of a U-shaped design opened toward the front chain; and the guide rail frame guides the side of the serially connected chain rings for stable transmission.

[0012] Furthermore, gaps connecting the inside and outside of adjacent connecting pipes are provided; the travel drive mechanism is provided with a water pump connected to a water source and a pipeline connecting the water pump and the casing; one end of the pipeline is inserted into the gap between the casing and the traction rope to inject water into the interior.

[0013] Furthermore, a plurality of connecting tubes are hinged in sequence through a petal-type universal shaft; at least six petals are provided at one end of the connecting tube; and the side connecting tube is spot welded on the outer wall of the towing rope.

[0014] The present invention has the following beneficial effects: the present invention has a reasonable structural design and a simple structure. The driving sprocket with a groove cooperates with the meshing knife seat chain ring to form sufficient power drive for the saw chain. The special chain ring structure ensures sufficient saw chain strength and realizes the cutting of a gap of sufficient width in the coal seam, ensuring that a sufficient gap is formed for gas release after cutting; the arc-shaped knife seat cooperates with the knife seat chain ring to form a special chain ring structure, ensuring sufficient main body strength and saw chain thickness to achieve efficient slitting operation, and improving the efficiency of cutting coal block debris discharge; the sleeve formed by a plurality of petal-shaped universal hinged connecting tubes is sleeved on the outside of the traction rope, and the overall flexibility is retained and a certain strength is possessed without setting an elastic material, thereby reducing the safety hazard caused by the breakage of the saw chain, and the front chain and the rear chain are fully isolated, reducing the risk of collision and entanglement of the front chain and the rear chain during travel that affects the operation of the equipment; the end of the connecting tube is set as a petal-shaped universal shaft, while retaining flexibility, it has a certain strength, and there is a gap between the two adjacent connecting tubes for cooling water to flow out. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A top view of the structure of an embodiment of the present invention; Figure 2 This is a structural schematic diagram of a saw chain installation position according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of an isolation device according to an embodiment of the present invention; Figure 4 It is a schematic structural diagram of a cutting blade and a series-connected chain ring according to an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a driving sprocket according to an embodiment of the present invention; Figure 6 A schematic diagram of a usage scenario of an embodiment of the present invention; In the figure: 1-travel drive mechanism, 2-saw chain, 21-serial chain link, 22-cutting knife, 221-knife holder chain link, 222-knife holder, 223-knife head, 23-front chain, 24-rear chain, 3-driving sprocket, 31-slot, 32-connecting slot, 4-isolating device, 41-traction rope, 42-sleeve, 421-guide rail frame, 43-connecting pipe, 44-traction column. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0017] like Figures 1 to 6 In one embodiment of the special saw chain for coal seam geological cutting of the present invention, the ends are respectively installed on two travel drive mechanisms 1 across the coal seam, and the travel drive mechanism 1 is provided with a driving device for driving the saw chain 2 to rotate, characterized in that: the saw chain 2 includes a plurality of cutting knives 22 for cutting the coal seam, and a series chain ring 21 connecting two adjacent cutting knives 22; the series chain ring 21 and the cutting knives 22 are staggered in sequence; a driving sprocket 3 for driving the saw chain 2 to rotate is provided on the output shaft of the driving device; a groove 31 meshing with the cutting knives 22 is provided on the driving sprocket 3; a connecting groove 32 just for the series chain ring 21 to be inserted is provided between two adjacent grooves 31; the saw chain 2 on the side close to the coal seam is the front chain 23, and the saw chain 2 on the side away from the coal seam is the rear chain 24. The driving sprocket with the groove cooperates with the meshing knife holder chain ring to form sufficient power drive for the saw chain, and the special chain ring structure ensures sufficient saw chain strength, and realizes the cutting of a gap of sufficient width in the coal seam, ensuring that a sufficient gap is formed after cutting for gas release.

[0018] Specifically, the cutting blade 22 includes a blade holder chain ring 221, an arc-shaped blade holder 222 fixed on the blade holder chain ring 221; a plurality of blade heads 223 are arranged at intervals on the blade holder 222; and the blade holder 222 is arranged on the side of the blade holder chain ring 221 away from the driving sprocket 3. The arc-shaped blade holder is matched with the blade holder chain ring to form a special chain ring structure, which ensures sufficient main body strength and saw chain thickness to achieve efficient slitting operation and improve the efficiency of discharging the cut coal debris.

[0019] Specifically, the cutter head 223 is made of diamond alloy.

[0020] Specifically, the blade holder chain ring 221 and the serial connection chain ring 21 are both in a straight line shape; adjacent blade holder chain rings 221 and the serial connection chain ring 21 form a cross shape.

[0021] Specifically, the travel drive mechanism 1 is provided with an isolation device 4 for separating the front chain 23 and the rear chain 24; the isolation device 4 includes a traction column 44 provided on the travel drive mechanism 1, a traction rope 41 connected to two traction columns 44 at both ends, and a sleeve 42 sleeved outside the traction rope 41; the sleeve 42 includes a plurality of universally hinged connecting pipes 43 in sequence. By sleeve-mounting a sleeve formed by a plurality of petal-shaped universally hinged connecting pipes outside the traction rope, the overall flexibility is retained without providing an elastic material and a certain strength, thereby reducing the safety hazard caused by the breakage of the saw chain, fully isolating the front chain and the rear chain, and reducing the risk of collision and entanglement of the front chain and the rear chain affecting the operation of the equipment during travel.

[0022] Specifically, a plurality of guide rail frames 421 are provided at intervals on one side of the sleeve 42 close to the front chain 23; the guide rail frame 421 is a U-shaped design opened toward the front chain 23; the guide rail frame 421 guides the side of the serial chain ring 21 for stable transmission. The plurality of U-shaped guide rail frames on the sleeve form a guide rail for guiding the serial chain ring in transmission, effectively achieving the position stability of the isolation device and the saw chain, further ensuring that the isolation device is stably located between the front chain and the rear chain, and achieving timely isolation of the saw chain.

[0023] Specifically, gaps are provided between adjacent connecting pipes 43 to connect the inside and outside thereof; the travel drive mechanism 1 is provided with a water pump connected to a water source and a pipeline connecting the water pump and the inside of the casing 42; one end of the pipeline is inserted into the gap between the casing 42 and the traction rope 41 to inject water into the inside. Through the connection gaps between the multiple linking pipes, the water flow transmitted into the gap between the casing and the traction rope is dispersed and flows out, so that the saw chain at multiple locations is timely cooled to ensure uniform cooling of the saw chain.

[0024] Specifically, multiple connecting tubes 43 are hinged in sequence through a petal-shaped universal shaft; at least 6 petals are provided at one end of the connecting tube 43; and the connecting tube 43 on the side is spot welded on the outer wall of the towing rope 41. By setting the end of the connecting tube as a petal-shaped universal shaft, it has a certain strength while retaining flexibility, and there is a gap between two adjacent connecting tubes for cooling water to flow out.

[0025] Working principle: two travel drive mechanisms 1 enter the pre-dug tunnels respectively, and the two tunnels are pre-connected by a drilling device, the saw chain 2 passes through the hole and is installed on the travel drive mechanism 1 on the driving sprocket 3 driven by the driving device, and the knife seat chain ring 221 is installed in the groove 31, the driving sprocket 3 forms sufficient power drive for the saw chain 2, and ensures sufficient strength of the saw chain 2, so as to achieve the cutting of a gap of sufficient width in the coal seam, and ensure that a sufficient gap is formed after cutting for the release of gas; when the equipment is used, the equipment is started, the travel drive mechanism 1 cooperates with the coal seam to form tension on the saw chain 2, the driving sprocket 3 drives the saw chain 2 to move forward, the arc knife seat 222 cooperates with the alloy knife head 223 to fully cut the coal seam, and realizes a high-efficiency slitting operation; the arc knife seat 222 cooperates with the knife seat chain ring 221 to form The special chain ring structure ensures sufficient main body strength and facilitates the discharge of debris from the cut coal seam; in the process of cutting the coal seam, the towing column 4 on the walking drive mechanism 1 simultaneously drives the isolation device 4 placed between the front chain 23 and the rear chain 24 to move synchronously, and multiple petal-type universal hinged connecting pipes 43 are sleeved on the outside of the traction rope 41. Without setting elastic material, the overall flexibility is retained and a certain strength is possessed, which reduces the safety hazard caused by the breakage of the saw chain 2, and fully isolates the front chain 23 and the rear chain 24, reducing the risk of collision and entanglement between the front chain 23 and the rear chain 24 affecting the operation of the equipment during travel, and the gap of the petal-type hinge shaft guides the water flow injected into the gap between the connecting pipe 43 and the traction rope 41 to flow out, so as to evenly wet and cool the saw chain in the cutting coal seam at multiple locations, thereby ensuring the cooling efficiency of the saw chain 2.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special saw chain for geological cutting of coal seams, the ends of which are respectively mounted on two travel drive mechanisms (1) across the coal seams, the travel drive mechanisms (1) being provided with a drive device for driving the saw chain (2) to rotate, characterized in that: The saw chain (2) comprises a plurality of cutting knives (22) for cutting coal seams, and a series chain link (21) connecting two adjacent cutting knives (22); the series chain link (21) and the cutting knives (22) are arranged in an alternating manner; a driving sprocket (3) for driving the saw chain (2) to rotate is arranged on the output shaft of the driving device; a socket (31) for meshing with the cutting knives (22) is arranged on the driving sprocket (3); a connecting groove (32) for inserting the series chain link (21) is arranged between two adjacent sockets (31); the saw chain (2) on the side close to the coal seam is a front chain (23), and the saw chain (2) on the side away from the coal seam is a rear chain (24).

2. The special saw chain for coal seam geological cutting according to claim 1, characterized in that: The cutting knife (22) comprises a knife seat chain ring (221) and an arc-shaped knife seat (222) fixed on the knife seat chain ring (221); a plurality of knife heads (223) arranged at intervals are arranged on the knife seat (222); and the knife seat (222) is arranged on a side of the knife seat chain ring (221) away from the driving sprocket (3).

3. The special saw chain for coal seam geological cutting according to claim 2, characterized in that: The cutter head (223) is made of diamond alloy.

4. The special saw chain for coal seam geological cutting according to claim 2, characterized in that: The knife seat chain ring (221) and the series-connected chain ring (21) are both in a straight line shape; adjacent knife seat chain rings (221) and series-connected chain rings (21) form a cross shape.

5. The special saw chain for coal seam geological cutting according to claim 1, characterized in that: The travel drive mechanism (1) is provided with an isolation device (4) for separating the front chain (23) from the rear chain (24); the isolation device (4) comprises a traction column (44) arranged on the travel drive mechanism (1), a traction rope (41) with two ends respectively connected to the two traction columns (44), and a sleeve (42) sleeved outside the traction rope (41); the sleeve (42) comprises a plurality of connection pipes (43) which are universally hinged in sequence.

6. The special saw chain for coal seam geological cutting according to claim 5, characterized in that: A plurality of guide rail frames (421) are arranged at intervals on one side of the sleeve (42) close to the front chain (23); the guide rail frame (421) is of a U-shaped design that opens toward the front chain (23); and the guide rail frame (421) guides the side of the serially connected chain ring (21) for stable transmission.

7. The special saw chain for coal seam geological cutting according to claim 5, characterized in that: A gap is provided between adjacent connecting pipes (43) to connect the inside and the outside thereof; the travel drive mechanism (1) is provided with a water pump connected to a water source and a pipeline connected to the water pump and the inside of the casing (42); one end of the pipeline is inserted into the gap between the casing (42) and the traction rope (41) to inject water into the inside.

8. The special saw chain for coal seam geological cutting according to claim 5, characterized in that: The plurality of connecting tubes (43) are hinged in sequence via a petal-type universal shaft; at least six petals are provided at one end of the connecting tube (43); and the connecting tube (43) on the side is spot welded to the outer wall of the traction rope (41).

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