A trolley with integrated adsorption dust reduction structure and dust reduction method thereof

Abstract

The present invention discloses a trolley with an integrated adsorption dust reduction structure and a dust reduction method thereof, comprising a door frame-shaped frame, a bottom beam under the frame, and wheels under the bottom beam. The front frame is connected to the tunnel excavation surface, and a water storage tank is provided on the rear frame. A plurality of fixed partitions arranged longitudinally between the front and rear frames enclose a plurality of gas flow channels inside the overall frame and between the overall frame and the tunnel wall. A water pipe with a spray head and a louvered dust suction plate are also provided inside each channel, and a dust curtain is provided under the crossbeam. The specific steps of the method are: 1. withdraw the trolley; 2. put down the dust curtain; 3. rotate the louvered dust suction plate to completely cover the gas flow channel; 4. open the switch valve, spray water and then blast; 5. move the trolley forward, keep spraying water to wash away the dust; 6. close the switch valve, put away the dust curtain and then clean the slag. The present invention uses the louvered dust suction plate installed on the tunnel trolley as a blasting dust adsorption tool, which improves the dust reduction effect and reduces the construction waiting time.

Description

Technical Field

[0001] The invention belongs to the field of rapid dust removal in tunnel construction, and in particular relates to a trolley with an integrated adsorption-type dust reduction structure and a dust reduction method thereof. Background Art

[0002] Tunnel blasting has the characteristics of a blowpipe effect. During the blasting process, the air volume at the excavation face expands, and a large amount of dust is carried into the air by the expanding gas, rapidly expanding outward along the tunnel. The tunnel is dusty, and workers cannot enter the excavation face to continue working in a short period of time. Due to the rapid air movement speed after the blasting, traditional dust suppression water mist is easily blown away by the wind, the water mist spraying distance is short, the combination of dust and water droplets is insufficient, and the dust reduction effect is not ideal. Summary of the invention

[0003] The present invention provides a trolley with an integrated adsorption dust reduction structure and a dust reduction method thereof, wherein a fixed partition plate and a movable shutter-type dust absorption plate installed on the tunnel trolley are used as blasting dust adsorption tools, thereby improving the dust reduction effect and reducing the construction waiting time.

[0004] To achieve the above object, the technical solution of the present invention is:

[0005] A trolley with an integrated adsorption dust reduction structure, comprising a plurality of door frame-shaped frames 1 arranged in a tunnel at intervals in front and back, two mutually parallel bottom beams 2 connecting the frames into an integral frame, the middle of the integral frame being a transport passage 3 for vehicles to pass through, the lower part of the integral frame being provided with wheels 4 for moving the integral frame, the frame located at the front end of the integral frame being connected to a tunnel excavation surface 5, the frame located at the rear end of the integral frame being provided with a water storage tank 6 of the same shape as the frame, the frame comprising a cross beam 101, a vertical beam 102, and a supporting diagonal beam 103, the cross beams between the front and rear frames, the vertical beams between the vertical beams, and the supporting diagonal beams between the supporting diagonal beams and the supporting beams Fixed partitions 7 are provided between the supporting diagonal beams, and the fixed partitions 7 enclose a plurality of front-to-rear through-going gas flow channels 8 inside the overall frame and between the overall frame and the tunnel wall. A plurality of rotatable louver-type dust collection plates 12 are provided in the gas flow channels 8, and one end of the louver-type dust collection plate 12 is hinged to the horizontal beam 101 or the vertical beam 102, and a fixing pin is provided between the other end of the louver-type dust collection plate 12 and the overall frame. At least one water pipe 9 with a plurality of sprinkler heads 901 is provided inside each gas flow channel, and the water pipe 9 is connected to the water storage tank 6. A retractable dust-proof curtain 10 is provided at the lower part of the horizontal beam 101 located above the transport channel.

[0006] A further solution is that the ratio of the diameter of the equivalent circular cross-section of the gas flow channel 8 to the length of the gas flow channel is not greater than 1:8.

[0007] A further solution is that the louvered dust collecting plate 12 includes no less than 10 mutually parallel plate surfaces, the plate surface width is greater than 100 mm, and the plate surfaces are spaced between 200 mm and 300 mm.

[0008] A further solution is that the rotation angle β of the louvered dust collecting plate 12 to completely cover the gas flow channel 8 is within 45°.

[0009] A further solution is that at least two louver-type dust collecting plates 12 are arranged in the gas flow channel 8 .

[0010] A further solution is that the number of the dust-proof curtains 10 is no less than 3.

[0011] A further solution is that a switch valve 11 is provided on the water storage tank, and the switch valve 11 is connected to a water pipe 9 with multiple sprinkler heads.

[0012] A further solution is that the interval between the spray heads 901 is no more than 200 mm.

[0013] Based on the method of the trolley with integrated adsorption dust reduction structure according to claim 1, the specific steps of the method are:

[0014] The first step is to withdraw the trolley to 30 meters away from the tunnel excavation face;

[0015] The second step is to put down the dust curtain 10 and fix its two bottom corners to the bottom beam 2 respectively;

[0016] The third step is to rotate the shutter-type dust collecting plate 12 to completely cover the gas flow channel 8 and lock the fixing pin;

[0017] Step 4: Open the switch valve 11 on the water storage tank 6, and the sprinkler head 901 sprays water for 2-3 minutes before bursting;

[0018] Step 5: Move the trolley forward to 5 places close to the mining face 10 minutes after blasting, and keep spraying water for 10 minutes to wash away the dust on the trolley;

[0019] The sixth step is to close the switch valve 11 on the water storage bin 6, put away the dust curtain 10 and then clean the slag.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention uses fixed partitions to divide the large-section gas passages inside the trolley and between the trolley and the tunnel, thereby increasing the flow resistance in the gas passage and effectively reducing the flow velocity of the blasting dust;

[0022] 2. The present invention utilizes a damp louver-type dust collecting plate and a fixed partition as adsorption tools, thereby improving the adsorption effect on dust particles and reducing the dust removal time;

[0023] 3. The shutter-type dust collecting plate of the present invention can be rotated and retracted, which does not affect the normal construction of workers on the trolley;

[0024] 4. The amount of water used for dust reduction in the present invention is much smaller than that in conventional methods, and has little impact on the slag removal work after blasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a lateral structural display diagram of the present invention;

[0028] Figure 3 It is a dust blocking state diagram of the present invention;

[0029] Figure 4 This is a diagram showing the shutter-type dust collecting plate of the present invention after being folded;

[0030] Figure 5 This is a state diagram of the shutter-type dust collecting plate of the present invention after being unfolded. DETAILED DESCRIPTION

[0031] A trolley with integrated adsorption dust suppression structure, see Figure 1 , Figure 2As shown, it includes a plurality of door frame-shaped frames 1 arranged in the tunnel at intervals in front and back, and two bottom beams 2 parallel to each other connect the frames into an integral frame. The middle part of the integral frame is a transport passage 3 for vehicles to pass through, and the lower part of the integral frame is provided with wheels 4 for moving the integral frame. The frame located at the front end of the integral frame is connected to the tunnel excavation surface 5, and the frame located at the rear end of the integral frame is provided with a water storage tank 6 of the same shape as the frame. The door frame-shaped frame 1 includes a cross beam 101, a vertical beam 102, and a supporting diagonal beam 103. Fixed partitions 7 are provided between the cross beams and the cross beams of the front and rear frames, between the vertical beams and the vertical beams, and between the supporting diagonal beams. The fixed partitions 7 enclose a plurality of gas flow passages 8 that pass through the interior of the integral frame and between the integral frame and the tunnel wall. The gas flow passage enclosed inside the integral frame is 801, and the gas flow passage enclosed between the integral frame and the tunnel wall is 802. The gas flow passage 8 is provided with a plurality of rotatable louver-type dust collecting plates 12. One end of the louvered dust collecting plate 12 is hinged to the horizontal beam 101 or the vertical beam 102, and a fixing pin is provided between the other end of the louvered dust collecting plate 12 and the overall frame. The louvered dust collecting plate 12 includes no less than 10 mutually parallel plate surfaces, the plate surface width is greater than 100mm, and the plate surface interval is between 200mm and 300mm. The rotation angle β of the louvered dust collecting plate 12 to completely cover the gas flow channel 8 is within 45°, and no less than 2 louvered dust collecting plates 12 are provided in the gas flow channel 8. At least one water pipe 9 with multiple sprinkler heads 901 is provided inside each gas flow channel 8, and the water pipe 9 is connected to the water storage tank 6. A retractable dust curtain 10 is provided at the lower part of the horizontal beam 101 located above the transport channel, and the number of dust curtains 10 is no less than 3. The ratio of the diameter of the equivalent circular section of the gas flow channel 8 to the length of the gas flow channel is not greater than 1:8. A switch valve 11 is provided on the water storage tank, and the switch valve 11 is connected to a water pipe 9 with a plurality of spray heads, and the interval between the spray heads 901 is no greater than 200 mm.

[0032] The dust reduction method of the trolley with integrated adsorption dust reduction structure according to claim 1 is shown in Figure 3 , Figure 4 , Figure 5As shown, the specific steps of the method are: the first step is to withdraw the trolley to 30 meters away from the tunnel excavation surface; the second step is to lower the dust curtain 10 and fix its two bottom corners to the bottom beam 2 respectively, and the transportation channel 3 is completely blocked by the dust curtain 10; the third step is to rotate the louvered dust suction plate 12, and the plate surface 1201 is staggered and unfolded under the drive of the connecting arm 1202, and the unfolded plate surface completely covers the gas flow channel 8, at this time, the unfolded end of the louvered dust suction plate 12 is connected to the tunnel side wall 13, and then, the fixing pin is locked to fix the unfolded end of the louvered dust suction plate 12 to the trolley; the fourth step is to open the switch valve 11 on the water storage tank 6, and the sprinkler head 901 sprays water for 2-3 minutes and then blasts; the fifth step is to move the trolley forward to the mining face 5 10 minutes after the blasting, and keep spraying water for 10 minutes to wash away the dust on the trolley; the sixth step is to close the switch valve 11 on the water storage tank 6, put away the dust curtain 10 and then clean the slag.

[0033] The dust reduction principle of the present invention is: at the moment of blasting on the tunnel excavation face, the gas at the excavation face expands, a large amount of dust is entrained therein, the dust particles are large and small, the gas flow speed is very fast, and the movement of gas molecules is in a turbulent state. It is known from common sense that the movement of turbulent gas molecules is a combination of longitudinal and lateral movement states. The movement speed of gas molecules close to the gas channel wall is slow, and the movement speed of gas molecules far away from the gas channel wall is fast. The traditional trolley frame is sparse, especially the cross-sectional area of ​​the transport channel 3 is large. The traditional trolley has little effect on decelerating the blasting gas, and the dust generated by the blasting will diffuse a long distance along the tunnel.

[0034] The fixed partition 7 on the trolley in the present invention divides the interior of the trolley and between the trolley and the tunnel into a plurality of small-section gas movement channels. The dust-proof curtain 10 is used in the middle of the trolley to directly block the transport channel 3. The gas after the blasting can only flow through the small-section gas channel. The trolley as a whole forms a large flow resistance in the tunnel, which significantly reduces the flow speed of the blasting gas. Large particles of dust are separated from the blasting gas and fall faster, thereby achieving a dust removal effect.

[0035] The fine dust generated after blasting is very light and performs Brownian motion in the tunnel space, which makes it difficult to fall or be drawn out by the ventilation system. The trolley in the present invention removes this part of fine dust by directly contacting the wet solid surface with the dust particles, and adsorbing the dust particles on the surface of the wet louvered dust collecting plate 12. Since the surface of the louvered dust collecting plate 12 is open during the dust removal process, it completely shields the tunnel longitudinally. During the forward movement of the trolley, the probability of the surface contacting small dust particles is much higher than the combination of water drop spray and dust particles in the traditional dust reduction method, and the dust reduction effect is better.

Claims

1. A trolley with an integrated adsorption dust reduction structure, comprising a plurality of door frame-shaped frames (1) arranged in a tunnel at intervals in front and back, two mutually parallel bottom beams (2) connecting the frames into an integral frame, the middle of the integral frame being a transport passage (3) for vehicles to pass through, the lower part of the integral frame being provided with wheels (4) for moving the integral frame, the frame located at the front end of the integral frame being connected to a tunnel excavation surface (5), the frame located at the rear end of the integral frame being provided with a water storage tank (6) of the same shape as the frame, the frame comprising a cross beam (101), a vertical beam (102), and a supporting oblique beam (103), the vertical beam (102) comprising two long vertical beams respectively connected to the two bottom beams (2), a long cross beam being provided at the upper ends of the two long vertical beams, a short vertical beam being provided at the upper ends of the long cross beams, a short cross beam being provided at the upper ends of the short vertical beams, the supporting oblique beam (103) being supported between the long vertical beams and the long cross beams, characterized in that: Fixed partitions (7) are provided between the horizontal beams, between the vertical beams, and between the supporting diagonal beams of the front and rear frames. The fixed partitions (7) enclose a plurality of gas flow passages (8) that pass through the entire frame and between the entire frame and the tunnel wall. A plurality of rotatable louver-type dust collecting plates (12) are provided in the gas flow passages (8). One end of the louver-type dust collecting plate (12) is hinged to the horizontal beam (101) or the vertical beam (102). A fixing pin is provided between the other end of the louver-type dust collecting plate (12) and the entire frame. At least one water pipe (9) with a plurality of spray heads (901) is provided in each gas flow passage. The water pipe (9) is connected to a water storage tank (6). A retractable dust-blocking curtain (10) is provided at the lower part of the horizontal beam (101) located above the transport passage. The ratio of the diameter of the equivalent circular cross section of the gas flow channel (8) to the length of the gas flow channel is not greater than 1:8; The fixed partition plate and the multiple rotatable shutter-type dust suction plates are blasting dust suction tools.

2. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: The shutter-type dust collecting plate (12) comprises no less than 10 mutually parallel plate surfaces, the plate surface width is greater than 100 mm, and the plate surface interval is between 200 mm and 300 mm.

3. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: The rotation angle β of the shutter-type dust collecting plate (12) to completely cover the gas flow channel (8) is within 45°.

4. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: No less than two louver-type dust collecting plates (12) are provided in the gas flow channel (8).

5. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: The number of the dust-blocking curtains (10) provided is no less than 3.

6. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: The water storage tank is provided with an on-off valve (11), and the on-off valve (11) is connected to a water pipe (9) with a plurality of sprinkler heads.

7. The trolley with integrated adsorption dust reduction structure according to claim 1, characterized in that: The interval between the spray heads (901) is no greater than 200 mm.

8. A dust reduction method for a trolley with an integrated adsorption dust reduction structure according to claim 1, characterized in that: The specific steps of the dust reduction method are: The first step is to withdraw the trolley to 30 meters away from the tunnel excavation face; The second step is to lower the dust-proof curtain (10) and fix its two bottom corners to the bottom beam (2) respectively; The third step is to rotate the shutter-type dust collecting plate (12) to completely cover the gas flow channel (8) and lock the fixing pin; Step 4: Open the switch valve (11) on the water storage tank (6), and the sprinkler head (901) sprays water for 2-3 minutes before bursting; Step 5: 10 minutes after blasting, move the trolley forward to a position close to the excavation surface (5), and keep spraying water for 10 minutes to wash away the dust on the trolley; The sixth step is to close the switch valve (11) on the water storage bin (6), put away the dust curtain (10) and then clean the slag.

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