Portable dust cover for negative pressure ground anchor drilling

Abstract

The utility model relates to a portable dust cover for negative pressure ground anchor drilling. An existing ground anchor drilling dustproof device is complex in structure, large in size and prone to abrasion. Therefore, the portable negative-pressure ground anchor drilling cover comprises a cover body, an air inlet window is arranged on the side wall of one side of the cover body, an exhaust pipe is arranged on the side wall of the other side of the cover body, the exhaust pipe is large in outside and small in inside, an air spraying pipe and a water spraying pipe are arranged on the pipe wall of the exhaust pipe respectively, and the inner ends of the air spraying pipe and the water spraying pipe extend into the exhaust pipe and are provided with an air nozzle and an atomizing nozzle respectively. The inner wall of the through hole extends inwards to form a short pipe, an external thread is arranged on the short pipe, a nut is sleeved on the external thread in a screwed mode, a drill rod of a matched drilling machine penetrates through the small through hole in the center of the nut, and a water absorption sponge ring is further sleeved on the drill rod in the through hole. The portable negative pressure ground anchor drilling dust cover is simple in structure, convenient to carry and use, small in abrasion during drilling and suitable for being used during underground ground anchor drilling.

Description

Technical Field

[0001] This utility model relates to a portable negative pressure ground anchor drilling dust cover. Background Technology

[0002] In actual coal mine production, a large number of ground anchors are required for equipment fixation. When using wet drilling for ground anchor drilling, the inability to remove dust-proof water often leads to borehole collapse and drill jamming. Dry excavation and dry drilling generate a large amount of dust, which greatly harms the health of workers.

[0003] Chinese invention patent CN101943021B, authorized on May 20, 2015, discloses a compressed air slag discharge drilling dust collector for underground coal mines. It includes a Venturi mixer, comprising an inlet chamber, a contraction section, a straight section, and a conical diffuser section. A high-pressure gas inlet pipe is installed in the inlet chamber, with its outer end located outside the chamber. At least one straight pipe parallel to the central axis of the Venturi mixer is connected to the inner end of the high-pressure gas inlet pipe. A high-pressure gas nozzle is installed at the other end of the straight pipe, with its outlet located inside the Venturi mixer. A water inlet pipe is also installed on the Venturi mixer, with a valve installed on it. A water atomizing nozzle is connected to the inner end of the water inlet pipe and is located inside the Venturi mixer.

[0004] The Venturi mixer in this patent functions as a jet pump. During operation, the orifice dust collector is fitted onto the drill rod. While drilling, large coal dust particles are discharged through the dust collector's discharge port and fall into the ground, while smaller dust particles are drawn away. The suction gas flow rate is greater than the outflow gas flow rate carrying coal dust, preventing dust emission from the orifice dust collector. However, this invention features a separate Venturi mixer and orifice dust collector, resulting in a complex structure, large size, and potential wear at the contact point between the drill rod and the orifice dust collector during drilling.

[0005] Chinese utility model patent CN 214221126 U, authorized on September 17, 2021, discloses a dust treatment device for anchor drilling rigs. The device includes a dust collection hood, which is trumpet-shaped with a larger opening at the front and a smaller opening at the rear. A locator is connected to the rear of the dust collection hood. An exhaust dust guide pipe, a cylindrical tube open at both ends, is fixed to the side of the dust collection hood. One end of the exhaust dust guide pipe is fixed to the side of the dust collection hood, and the other end is connected to a dust settling mechanism. A circular through hole matching the inner diameter of the exhaust dust guide pipe is formed on the side of the dust collection hood where the exhaust dust guide pipe is fixed. The dust settling mechanism includes a dust conduit, one end of which is fixed to the exhaust dust guide pipe, and the other end is sequentially connected to an axial flow fan and a sediment discharge pipe.

[0006] In comparison, the dust treatment device for anchor drilling rigs uses an axial flow fan instead of the venturi mixer in the previous invention. Its vacuum pump body and dust collection hood are set separately, which makes the structure complex and large in size. Moreover, the contact point between the drill rod and the dust collection hood is prone to wear during drilling. Summary of the Invention

[0007] The technical problem to be solved by this utility model is how to overcome the above-mentioned defects of the prior art and provide a portable negative pressure ground anchor drilling dust cover.

[0008] To solve the above-mentioned technical problems, this portable negative pressure ground anchor drilling cover includes a cover with an opening at the bottom and a rubber sealing ring on the lower edge. A through hole is located at the center of the top, through which the drill rod of the drilling rig passes. The cover is characterized by having an air inlet window on one side wall and an exhaust pipe on the other side wall. The exhaust pipe is wider at the outside and narrower at the inside, and has an air jet pipe and a water jet pipe on its wall. The air jet pipe and water jet pipe are respectively connected to a high-pressure air pipe and a high-pressure water pipe used downhole. The inner ends of both the air jet pipe and the water jet pipe extend into the exhaust pipe. The inner end of the air jet pipe... The device is equipped with a jet nozzle and an atomizing nozzle on the inner end of the water spray pipe. The nozzle orifices of both the jet nozzle and the atomizing nozzle point outward from the exhaust pipe, and the jet nozzle is located upstream of the atomizing nozzle. The inner wall of the through hole extends inward to form a short pipe with external threads. A nut is screwed onto the external threads, and the lower end of the nut is connected to an annular pressure plate. A small through hole is opened in the center of the annular pressure plate. The diameter of the through hole is greater than the diameter of the small through hole, which is greater than the diameter of the drill rod of the drilling machine. The drill rod of the drilling machine passes through the small through hole. A water-absorbing sponge ring is also fitted on the drill rod inside the through hole, and the lower surface of the water-absorbing sponge ring presses against the annular pressure plate.

[0009] When drilling for ground anchors, take out the portable negative pressure ground anchor drilling dust cover. First, put the nut, absorbent sponge ring, and cover onto the drill rod. Then, screw the nut onto the short tube of the cover and embed the absorbent sponge ring into the through hole. Next, fill the absorbent sponge ring with water using a syringe or suction tube. Then, install the drill rod on the drilling rig, place the drill bit against the corresponding position on the base plate, and press the lower edge of the cover against the base plate. Then, connect the air jet pipe to the high-pressure air hose and the water jet pipe to the high-pressure water hose. Then, you can start the drilling rig. Figure 1 As shown.

[0010] This design has two advantages. First, when the jet nozzle sprays air, it creates negative pressure inside the enclosure, drawing air in through the intake window. During drilling, dust particles are drawn in by the airflow and absorbed by the water mist from the atomizing nozzle, then expelled through the exhaust pipe. Because the dust particles have absorbed the water mist, they quickly fall to the ground after leaving the exhaust pipe, preventing dust pollution. Second, a water-absorbing sponge ring is installed between the drill rod and the hole wall of the enclosure. As the drill rod rotates, the water in the sponge ring wets and cools the drill rod, reducing wear. Most of the drill cuttings generated during drilling fall off and accumulate on the base plate around the hole. Figure 1 , 2 As shown.

[0011] As an optimization, the small through hole is a flared hole that is wider at the top and narrower at the bottom. A rubber ring is also fitted onto the drill rod of the accompanying drill inside the nut. The outer edge of the rubber ring is sandwiched between the short pipe and the annular pressure plate. The rubber ring is squeezed by the inner wall of the small through hole, and the inner wall of the rubber ring is in contact with the drill rod of the accompanying drill. With this design, water in the water-absorbing sponge ring is less likely to flow down, and the accompanying drill rod can be kept moist and cooled for a longer period of time during drilling.

[0012] As an optimization, an atomizing nozzle is also provided next to the air intake window inside the enclosure. The nozzle's spray hole points towards the exhaust pipe and is connected to the water spray pipe via a branch pipe. Valves are provided on the branch pipe, water spray pipe, and air spray pipe. With this design, during drilling, the valve on the branch pipe can be opened to spray a small amount of water mist onto the drill cuttings around the borehole, reducing dust inside the enclosure. Of course, the branch pipe valve should not be opened too wide to avoid excessive water mist spraying and the formation of wastewater.

[0013] This portable negative pressure ground anchor drilling dust cover generates negative pressure inside the cover during use, and also functions as a jet pump. It has a simple structure, is easy to carry and use, and causes little wear during drilling, making it suitable for use when drilling ground anchors in wells. Attached Figure Description

[0014] The portable negative pressure ground anchor drilling dust cover of this utility model will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This is a cross-sectional structural diagram of the portable negative pressure ground anchor drilling dust cover in use (cut along the vertical bisecting plane of the exhaust pipe);

[0016] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the portable negative pressure ground anchor drilling dust cover along the A-A direction.

[0017] In the diagram: 1 is the cover, 2 is the rubber sealing ring, 3 is the through hole, 4 is the drill rod for the drilling machine, 5 is the air inlet window, 6 is the exhaust pipe, 7 is the air jet pipe, 8 is the water spray pipe, 9 is the air jet nozzle, 10 is the atomizing nozzle, 11 is the short pipe, 12 is the nut, 13 is the annular pressure plate, 14 is the small through hole, 15 is the water-absorbing sponge ring, 16 is the rubber ring, 17 is the branch pipe, and 18 is the valve. Detailed Implementation

[0018] Implementation method one: such as Figures 1-2 As shown, this portable negative pressure ground anchor drilling dust cover includes a cover body 1. The cover body 1 has an opening at the bottom and a rubber sealing ring 2 on the lower edge. A through hole 3 is opened at the center of the top, through which the drill rod 4 of the drilling rig passes. The cover body 1 is characterized by having an air inlet window 5 on one side wall and an exhaust pipe 6 on the other side wall. The exhaust pipe 6 is wider at the outside and narrower at the inside. An air jet pipe 7 and a water jet pipe 8 are respectively installed on the wall of the exhaust pipe 6. The air jet pipe 7 and the water jet pipe 8 are connected to a high-pressure air pipe (not shown) and a high-pressure water pipe (not shown) for use downhole drilling, respectively. The inner ends of both the air jet pipe 7 and the water jet pipe 8 extend into the exhaust pipe 6. An air nozzle 9 is provided on the inner end of the air jet pipe 7. Atomizing nozzle 10 is provided on the inner end of the water spray pipe 8. The spray holes of both the air jet nozzle 9 and the atomizing nozzle 10 point outward from the exhaust pipe 6, and the air jet nozzle 9 is located upstream of the atomizing nozzle 10. The inner wall of the through hole 3 extends inward to form a short pipe 11. The short pipe 11 is provided with external threads, and a nut 12 is screwed onto the external threads. The lower end of the nut 12 is connected to an annular pressure plate 13. A small through hole 14 is opened in the center of the annular pressure plate 13. The diameter of the through hole 3 is greater than the diameter of the small through hole 14, which is greater than the diameter of the drill rod 4 of the drilling machine. The drill rod 4 of the drilling machine passes through the small through hole 14. A water-absorbing sponge ring 15 is also fitted on the drill rod 4 inside the through hole 3. The lower surface of the water-absorbing sponge ring 15 presses on the annular pressure plate 13.

[0019] The small through hole 14 is a flared hole that is larger at the top and smaller at the bottom. A rubber ring 16 is also fitted on the drill rod 4 of the drill rig inside the nut 12. The outer edge of the rubber ring 16 is sandwiched between the short pipe 11 and the annular pressure plate 13. The rubber ring 16 is squeezed by the inner wall of the small through hole and partially abuts against the drill rod 4 of the drill rig.

[0020] Atomizing nozzle 10 is also provided next to the air intake window 5 inside the cover 1. The nozzle 10 has its nozzle pointing towards the exhaust pipe 6 and is connected to the water spray pipe 8 through a branch pipe 17. Valves 18 are provided on the branch pipe 17, the water spray pipe 8 and the air spray pipe 7 respectively.

Claims

1. A portable dust cover for negative pressure ground anchor drilling, comprising a cover body, the cover body having an opening at the bottom and a rubber sealing ring on the lower edge, and a through hole at the center of the top, through which a drill rod for a drilling machine passes, characterized in that: The cover has an air inlet window on one side wall and an exhaust pipe on the other side wall. The exhaust pipe is wider at the outside and narrower at the inside. The exhaust pipe wall is equipped with a jet pipe and a water spray pipe, which are connected to the downhole high-pressure air pipe and high-pressure water pipe, respectively. The inner ends of the jet pipe and the water spray pipe extend into the exhaust pipe. The inner end of the jet pipe is equipped with a jet nozzle, and the inner end of the water spray pipe is equipped with an atomizing nozzle. The nozzles of the jet nozzle and the atomizing nozzle point outward from the exhaust pipe, and the jet nozzle is located upstream of the atomizing nozzle. The inner wall of the through hole extends inward into a short pipe with external threads. A nut is screwed onto the external threads. The lower end of the nut is connected to an annular pressure plate. A small through hole is opened in the center of the annular pressure plate. The diameter of the through hole is greater than the diameter of the small through hole, which is greater than the diameter of the drill rod of the drilling rig. The drill rod of the drilling rig passes through the small through hole. A water-absorbing sponge ring is also fitted on the drill rod inside the through hole. The lower surface of the water-absorbing sponge ring presses against the annular pressure plate.

2. The portable negative pressure ground anchor drilling dust cover according to claim 1, characterized in that: A misting nozzle is also provided next to the air intake window inside the cover. The nozzle orifice points to the exhaust pipe and is connected to the water spray pipe through a branch pipe. Valves are provided on the branch pipe, the water spray pipe and the air spray pipe respectively.

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