Mining, screening and collecting device for shield outburst prevention prediction of outburst coal seam

Abstract

The utility model discloses a mining, screening and collecting device for outburst coal seam shield outburst prevention prediction, relates to the technical field of underground shield operation coal roadway outburst prevention prediction, and solves the problems that an outburst risk prediction result for a heading face is easy to distort and time and labor are consumed in the prior art. Comprising a perforated fixed drainage rod, a windproof confluence device, an upper channel, a lower channel and a coal dust collecting bag, the perforated fixed drainage rod is drilled into a coal wall by opening a cutter head door of a shield tunneling machine, far-end in-situ collection is performed on coal dust, a double filtering means is adopted, the upper channel and the lower channel are subjected to preposed screening before sampling and measuring, and the coal dust collecting bag is used for collecting the coal dust. Coal dust with the specified particle size can be collected, the coal sample screening efficiency is improved, the coal sample exposure time is shortened, the prediction accuracy is improved, the wind-proof confluence device can prevent wind flow from blowing away the coal dust discharged from the drill hole and directionally collecting the coal dust, and the prediction accuracy is improved; the whole device is simple, can be operated by one person, and is easy to operate, time-saving, labor-saving and low in maintenance cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal tunnel outburst prevention prediction in underground shield operation, and relates to a mining, screening and collecting device used for outburst prevention prediction in shield operation of coal seams. Background Art

[0002] With the deepening of modernization construction, the demand for intelligent and professional development of coal mines continues to increase, and shield tunneling operation lines will be fully promoted and applied. The shield machine used in coal tunnel shield tunneling is a full-section shield operation, such as Figure 7 As shown in the figure, the shield machine completely occupies the space of the excavation working face, and the radial working space of 3-5 meters is required to complete the prediction of the danger of sudden outburst at the head of the excavation working face. Since the head of the shield excavation of the coal roadway is close to the shield machine cutterhead, and the internal working space of the shield machine is divided by the shield machine cutterhead, it is impossible to collect and sample coal dust for the prediction of the danger of sudden outburst at the head of the excavation working face, resulting in the inability to realize shield excavation operation in the coal roadway that requires prediction of the danger of sudden outburst.

[0003] Articles 89, 90, 91 and 92 of the Detailed Rules for Preventing and Controlling Coal and Gas Outbursts state that in order to predict the danger of outbursts at the coal tunnel excavation working face, it is necessary to construct at least 2 to 3 prediction holes in the coal body in front of the working face and collect coal drill cuttings from the 2m depth. The instruction manual of the measuring instrument requires that the sampling and measurement time should not exceed 2 minutes. However, the coal cuttings used in the existing technology for predicting the danger of outbursts at the working face during shield tunneling of coal tunnels cannot be fully collected. Figure 8 As shown, the prior art is to manually perform drilling, collection, screening and sampling in a radial working space of 3-5m. The process is complicated and time-consuming. In addition, since the collection machine is heavy, it often requires multiple people to support the drilling. However, the working structure is narrow and often requires constant adjustment, which is time-consuming and labor-intensive. Sampling and measurement are difficult, and there is no guarantee that the sampling and measurement will be completed within the time required, which can easily cause distortion in the prediction of the danger of a prominent danger. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing prediction result of the danger of outburst on the excavation working face is easily distorted and time-consuming and labor-intensive.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A mining, screening and collecting device for outburst prediction of shield tunneling in coal seams, comprising an opening fixed drainage rod (1), a drill bit (2), a cutting support drill bit (3), a double-channel coal dust outlet trough (4), a windproof confluence device (5), a connecting rod (6), a hook ring (11), a funnel (12), a coal dust collection bag (13), and a prediction drill rod (16);

[0007] The front end of the perforated fixed drainage rod (1) is provided with a plurality of drill teeth (2), the rear end of the perforated fixed drainage rod (1) is connected to the front end of the connecting rod (6), a plurality of cutting support drill teeth (3) are provided near the rear end of the perforated fixed drainage rod (1), the front and rear walls of the upper part of the windproof confluence device (5) are opened, wherein the front upper wall opening of the windproof confluence device (5) is connected to the rear end of the connecting rod (6), the rear upper wall opening of the windproof confluence device (5) is connected to the prediction drill rod (16), and the windproof confluence device (5) is provided with a plurality of cutting support drill teeth (3). A plurality of hook rings (11) are provided at the top of the device (5); the lower end of the windproof and converging device (5) is connected to a funnel (12); the lower end of the funnel (12) is connected to a coal dust collecting bag (13); and a double-channel coal dust outlet groove (4) is provided in the windproof and converging device (5); the double-channel coal dust outlet groove (4) is in the shape of a U-shaped groove; and a drill rod (16) is predicted to pass through the opening of the upper rear wall of the windproof and converging device (5), the connecting rod (6), and the opening fixing drainage rod (1).

[0008] The utility model realizes the remote in-situ sampling, screening and collection of coal dusts excavated by shield tunneling in a protruding coal seam. The fixed drainage rod with an open hole is drilled into the coal wall through the cutter head of the shield machine to collect the coal dusts in-situ at the remote end. The cutting support drill teeth assist in drilling and support the fixed drainage rod. The windproof convergence device can prevent the wind flow from blowing away the coal dusts discharged from the borehole and collect them in a directional manner, thereby improving the accuracy of prediction. In addition, a double filtering method is adopted to improve the screening efficiency of the coal samples, shorten the exposure time of the coal samples, and improve the accuracy of prediction. Moreover, the overall device is relatively simple and can be operated by one person. The operation is simple, time-saving and labor-saving, and the maintenance cost is low.

[0009] Furthermore, the dual-channel coal dust outlet chute (4) comprises an upper channel (8) and a lower channel (9), wherein the upper channel (8) is installed directly below the connecting rod (6), and the lower channel (9) is installed directly below the upper channel (8).

[0010] Beneficial effects: Double filtering means and dual-channel coal dust export troughs are used for pre-screening before sampling and measurement, and coal dust of specified particle size can be collected.

[0011] Furthermore, the upper channel (8) comprises a filtering section (81) and an outlet section (82), the bottom of the filtering section (81) is provided with a plurality of meshes with a diameter of 4 mm, and the outlet section (82) is provided with bifurcated outlet chutes guiding both sides.

[0012] Furthermore, it also includes a shaft rod (10), and the upper channel (8) and the lower channel (9) are each provided with a shaft rod (10), and the shaft rod (10) runs through the upper channel (8) and the lower channel (9).

[0013] Furthermore, the upper channel (8) is movably connected to the front and rear walls of the windproof and convergent device (5) via an axle rod (10), and the axle rod (10) slightly extends outward of the windproof and convergent device (5) at the connection position of the rear wall of the windproof and convergent device (5).

[0014] Beneficial effect: The collection state can be flexibly changed by rotating the shaft.

[0015] Furthermore, the installation position of the upper channel (8) on the front wall of the windproof and convergent device (5) through the shaft (10) is higher than the installation position on the rear wall of the windproof and convergent device (5), so that the upper channel (8) is at an inclined angle.

[0016] Beneficial effects: The coal slag can be filtered and exported under a certain degree of vibration, which improves the coal sample screening efficiency, shortens the coal sample exposure time, and improves the prediction accuracy. It can be operated by one person, which is simple to operate, saving time and effort.

[0017] Furthermore, the lower channel (9) is a full filtering structure with a plurality of meshes with a diameter of 1 mm arranged at the bottom.

[0018] Furthermore, one end of the lower channel (9) is movably connected to the front wall of the windproof convergence device 5 through an axis rod (10), and the other end of the lower channel (9) is set on the rear wall of the funnel (12) through the axis rod (10), and the axis rod (10) slightly extends out of the funnel (12) at the connection position of the rear wall of the funnel (12).

[0019] Beneficial effect: The collection state can be flexibly changed by rotating the shaft.

[0020] Furthermore, it also includes a coal dust outlet (14), which is arranged at the other end of the lower channel (9) and connected to the rear wall of the funnel (12) through a shaft rod (10).

[0021] Furthermore, it also includes a transition joint (7) and a drilling rig, wherein the rear end of the transition joint (7) is connected to the drilling rig, and the front end of the transition joint (7) is connected to the rear end of the perforated fixed drainage rod (1). BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to the first embodiment of the utility model;

[0023] Figure 2 This is a top view of an upper channel of a mining, screening and collecting device for outburst prediction of shield tunneling in a coal seam according to a first embodiment of the utility model;

[0024] Figure 3 This is a front view of an upper channel of a mining, screening and collecting device for outburst prediction of shield tunneling in a coal seam according to a first embodiment of the utility model;

[0025] Figure 4 This is a top view of the lower channel of a mining, screening and collecting device for outburst prediction of shield tunneling in a coal seam according to the first embodiment of the utility model;

[0026] Figure 5 This is a front view of the lower channel of a mining, screening and collecting device for outburst prediction of shield tunneling in a coal seam according to the first embodiment of the utility model;

[0027] Figure 6 It is a top view of a double-channel coal dust outlet chute in a windproof confluence device of a mining, screening and collecting device for outburst prediction of a shield tunnel in a coal seam in the first embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of shield machine operation of a mining, screening and collecting device for shield tunneling outburst prevention prediction of outburst coal seams in the first embodiment of the utility model;

[0029] Figure 8 It is a schematic diagram of the operation of coal roadway excavation working face prediction of a mining, screening and collecting device used for shield outburst prevention prediction of coal seams in embodiment 1 of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments of the specification:

[0032] Embodiment 1

[0033] like Figure 1 As shown, a mining, screening and collecting device for shield tunneling outburst prediction in coal seam in the first embodiment of the utility model includes an open hole fixed drainage rod 1, drill teeth 2, cutting support drill teeth 3, a double-channel coal dust outlet trough 4, a windproof convergence device 5, a connecting rod 6, a transition joint 7 (not shown in the figure), an upper channel 8 (4mm mesh), a lower channel 9 (1mm mesh), an axle rod 10, a hook ring 11, a funnel 12, a coal dust collection bag 13, a coal dust outlet 14, a shield machine cutter head 15, and a prediction drill rod 16; 17 in the attached figure is a coal wall.

[0034] The perforated fixed drainage rod 1 is a hollow round tube, and a plurality of drill teeth 2 are provided at the front end, wherein the specific number of the drill teeth is not unique, and is set according to actual use conditions, and this application will not go into too much detail; a round thread is provided on the inner side of the rear end of the perforated fixed drainage rod 1, and a plurality of cutting support drill teeth 3 are also provided around the outside of the perforated fixed drainage rod 1 at the rear part of the perforated fixed drainage rod 1, wherein the specific number of the cutting support drill teeth is not unique, and is set according to actual use conditions, and this application will not go into too much detail,

[0035] The connecting rod 6 is a hollow round tube. The outer side of the front end of the connecting rod 6 is provided with a round thread which can be connected to the rear end of the opening fixed drainage rod 1, and the inner side of the rear end of the connecting rod 6 is provided with a round thread.

[0036] The rear end of the transition joint 7 is connected to a drilling rig (a pneumatic or electric handheld drilling rig for construction prediction drilling). The front end outer side of the transition joint 7 is a round thread, which can be connected to the rear end of the hole-fixed drainage rod 1 or the rear end of the connecting rod 6.

[0037] It is predicted that the drill rod 16 is a spiral driven drill rod, and the drill rod 16 can completely penetrate the connection structure between the connecting rod 6 and the perforated fixed drainage rod 1 and extend partly.

[0038] The windproof confluence device 5 is a rectangular hollow cover with an opening at the bottom. The front and rear walls of the upper part of the windproof confluence device 5 have corresponding openings. The opening of the front upper wall of the windproof confluence device 5 corresponds to the connecting rod 6, so that the windproof confluence device 5 can be mounted on the rear end of the connecting rod 6. The opening of the rear upper wall of the windproof confluence device 5 corresponds to the predicted drill rod 16. Two hook rings 11 are provided on the upper part of the windproof confluence device 5, and a funnel 12 is connected to the lower part. A coal dust collection bag 13 is provided at the lower end of the funnel 12.

[0039] The windproof confluence device 5 is also provided with a double-channel coal dust outlet trough 4, which has two upper and lower channels, namely an upper channel 8 and a lower channel 9. The upper channel 8 and the lower channel 9 are both U-shaped. The upper channel 8 includes a front filtering section 81 and a rear forked outlet section 82. Figure 2 The top view of the upper channel of the utility model, wherein the filter section 81 occupies about 3 / 4 of the area of ​​the upper channel 8, the bottom of the filter section 81 is provided with a plurality of meshes with a diameter of 4 mm, the outlet section 82 is provided with forked outlet chutes guiding both sides, and the width of the outlet section 82 is greater than the front filter section of the upper channel 8, see Figure 3 The utility model upper channel front view; the lower channel 9 is a full filtering structure with a plurality of 1mm diameter meshes at the bottom, see Figure 4 The utility model lower channel top view and Figure 5 Front view of the lower channel, wherein the width of the lower channel 9 is equal to the filtering section 81 of the upper channel 8, the width of the outlet section 82 is greater than the width of the lower channel 9, and the lower channel 9 is arranged directly below the upper channel 8, see Figure 6A top view of the double-channel coal dust outlet chute of the utility model in a windproof confluence device; both the upper channel 8 and the lower channel 9 are provided with a shaft rod 10 , which passes through the upper channel 8 and the lower channel 9 .

[0040] See also Figure 1 The upper channel 8 is movably connected to the front and rear walls of the windproof confluence device 5 through the shaft 10, and the shaft 10 slightly extends out of the windproof confluence device 5 at the connection position of the rear wall of the windproof confluence device 5, and the filtering section 81 of the upper channel 8 can be located directly below the connecting rod 6, and the installation position of the upper channel 8 on the front wall is higher than the installation position on the rear wall, so that the upper channel 8 is at an inclined angle; the lower channel 9 is arranged directly below the upper channel 8 and is also inclined, but the difference is that the inclination angle of the lower channel 9 is larger than that of the upper channel 8, and the high end of the lower channel 9 is movably connected to the front wall of the windproof confluence device 5 through the shaft 10, and the lower end of the lower channel 9 is arranged on the rear wall of the funnel 12 through the shaft 10, and the shaft 10 slightly extends out of the funnel 12 at the connection position of the rear wall of the funnel 12, and at the same time, a coal dust outlet 14 is also provided at the upper part of the rear wall of the funnel 12 connected to the lower end of the lower channel 9 by the shaft 10.

[0041] Working method:

[0042] 1) After a shield tunneling operation cycle is completed, the shield machine stops operating, and one end of the transition joint 7 with a round thread is connected to the tail end of the hole-opening fixed drainage rod 1, and the other end of the transition joint 7 is connected to the drilling rig. The shield machine cutterhead opens the door to drill the hole-opening fixed drainage rod 1 into the head-on coal wall. The rotation of the drilling rig drives the hole-opening fixed drainage rod 1 to rotate, and the hole-opening fixed drainage rod 1 is drilled into the coal wall 17 under the action of the drill teeth 2 and the cutting support drill teeth 3;

[0043] 2) When the hole-opening fixed drainage rod 1 is completely drilled into the coal wall 17, the drilling is stopped, and the transition joint 7 is removed under the support and fixing action of the cutting support drill bit 3, and the front end with round threads on the outer side of the connecting rod 6 is connected to the rear end of the hole-opening fixed drainage rod 1, and the windproof confluence device 5 is installed on the rear end of the connecting rod 6, and the windproof confluence device 5 is fixed by the hook ring 11 on the upper part of the windproof confluence device 5;

[0044] 3) During normal drilling and slag removal, by rotating the shaft 10 extending from the upper channel 8 on the rear wall of the windproof and confluence device 5 and the shaft 10 extending from the lower channel 9 on the rear wall of the funnel 12, the upper channel 8 and the lower channel 9 are adjusted to a vertical state, and the predicted drill rod 16 is inserted into the connecting rod 6 through the opening position of the upper rear wall of the windproof and confluence device 5 to perform normal drilling and slag removal. The coal slag falls from the rear end of the connecting rod 6 under the action of the screw thread of the predicted drill rod 16, and enters the coal dust collection bag 13 through the funnel 12;

[0045] 4) When the drill rod 16 is predicted to drill into the predetermined depth position for sampling, the upper channel 8 and the lower channel 9 are adjusted to a horizontal state by rotating the shaft 10 extending from the upper channel 8 on the rear wall of the windproof confluence device 5 and the shaft 10 extending from the lower channel 9 on the rear wall of the funnel. At this time, the coal slag falls from the rear end of the connecting rod 6 and is first filtered through the filter section 81 of the upper channel 8. The coal slag with a particle size of less than 4 mm falls into the lower channel 9. The coal slag with a particle size of more than 4 mm falls into the coal slag collection bag 13 through the outlet section 82 of the upper channel 8. At the same time, the coal slag with a particle size of less than 1 mm is filtered twice through the lower channel 9 and falls into the coal slag collection bag 13;

[0046] 5) Open the coal dust outlet 14, take out the coal dust with a particle size of 1-4 mm as the sample to be tested, and all the other coal dust discharged from the drilling operation enters the coal dust collection bag 13 through the windproof confluence device 5 and the funnel 12 for weighing and counting.

[0047] Beneficial effects:

[0048] The utility model realizes the remote in-situ sampling, screening and collection of coal dusts excavated by shield tunneling in a protruding coal seam. The fixed drainage rod with an open hole is drilled into the coal wall through the cutter head of the shield machine to collect the remote in-situ coal dusts. The cutting support drill teeth assist in drilling and support the fixed drainage rod. The windproof convergence device can prevent the wind flow from blowing away the coal dusts discharged from the borehole and collect them in a directional manner, thereby improving the accuracy of prediction. The collection state can be flexibly converted by rotating the shaft rod. In addition, double filtering means is adopted, and the dual-channel coal dust export trough performs pre-screening before sampling and measurement, so that coal dusts of specified particle size can be collected, thereby improving the screening efficiency of coal samples, shortening the exposure time of coal samples, and improving the accuracy of prediction. Moreover, the overall device is relatively simple and can be operated by one person, with simple operation, saving time and effort, and low maintenance cost.

[0049] 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. 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 mining, screening and collecting device for outburst prediction of shield tunneling in coal seams, characterized in that: It comprises an opening fixed drainage rod (1), a drill tooth (2), a cutting support drill tooth (3), a double-channel coal dust outlet trough (4), a windproof confluence device (5), a connecting rod (6), a hook ring (11), a funnel (12), a coal dust collection bag (13), and a prediction drill rod (16); The front end of the perforated fixed drainage rod (1) is provided with a plurality of drill teeth (2), the rear end of the perforated fixed drainage rod (1) is connected to the front end of the connecting rod (6), a plurality of cutting support drill teeth (3) are provided near the rear end of the perforated fixed drainage rod (1), the front and rear walls of the upper part of the windproof confluence device (5) are opened, wherein the front upper wall opening of the windproof confluence device (5) is connected to the rear end of the connecting rod (6), the rear upper wall opening of the windproof confluence device (5) is connected to the prediction drill rod (16), and the windproof confluence device (5) is provided with a plurality of cutting support drill teeth (3). A plurality of hook rings (11) are provided at the top of the device (5); the lower end of the windproof and converging device (5) is connected to a funnel (12); the lower end of the funnel (12) is connected to a coal dust collecting bag (13); and a double-channel coal dust outlet groove (4) is provided in the windproof and converging device (5); the double-channel coal dust outlet groove (4) is in the shape of a U-shaped groove; and a drill rod (16) is predicted to pass through the opening of the upper rear wall of the windproof and converging device (5), the connecting rod (6), and the opening fixing drainage rod (1).

2. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 1 is characterized in that: The double-channel coal dust outlet chute (4) comprises an upper channel (8) and a lower channel (9), wherein the upper channel (8) is installed directly below the connecting rod (6), and the lower channel (9) is installed directly below the upper channel (8).

3. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 2 is characterized in that: The upper channel (8) comprises a filtering section (81) and a lead-out section (82). The bottom of the filtering section (81) is provided with a plurality of meshes with a diameter of 4 mm, and the lead-out section (82) is provided with bifurcated lead-out chutes guiding both sides.

4. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 2 is characterized in that: It also includes a shaft rod (10), and the upper channel (8) and the lower channel (9) are each provided with a shaft rod (10), and the shaft rod (10) runs through the upper channel (8) and the lower channel (9).

5. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 4 is characterized in that: The upper channel (8) is movably connected to the front and rear walls of the windproof and convergent device (5) via a shaft (10), and the shaft (10) slightly extends outward of the windproof and convergent device (5) at the connection position of the rear wall of the windproof and convergent device (5).

6. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 5 is characterized in that: The installation position of the upper channel (8) on the front wall of the windproof and flow-gathering device (5) through the shaft (10) is higher than the installation position on the rear wall of the windproof and flow-gathering device (5), so that the upper channel (8) is at an inclined angle.

7. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 2 is characterized in that: The lower channel (9) is a full filtering structure with a plurality of meshes with a diameter of 1 mm arranged at the bottom.

8. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 4 is characterized in that: One end of the lower channel (9) is movably connected to the front wall of the windproof converging device (5) through a shaft (10), and the other end of the lower channel (9) is arranged on the rear wall of the funnel (12) through the shaft (10), and the shaft (10) slightly extends outward of the funnel (12) at the connection position of the rear wall of the funnel (12).

9. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 8 is characterized in that: It also includes a coal dust outlet (14), which is arranged at the other end of the lower channel (9) and connected to the rear wall of the funnel (12) through a shaft rod (10).

10. The mining, screening and collecting device for outburst prediction of shield tunneling in coal seams according to claim 1 is characterized in that: It also comprises a transition joint (7) and a drilling rig, wherein the rear end of the transition joint (7) is connected to the drilling rig, and the front end of the transition joint (7) is connected to the rear end of the perforated fixed drainage rod (1).

Images