Circumferential cutting hollow drill for granite drilling and coring

Abstract

The utility model relates to an annular cutting hollow drill for drilling and coring granite, which comprises a barrel connected with a drilling machine, a drill bit positioned on the opening end face of the barrel, and an air suction hole formed in the opening end face of the barrel, and a flow groove communicated with the air suction hole and an air suction pump is formed in the inner wall of the barrel. And a telescopic cutter group for cutting a cutting groove in the cylindrical stone and a telescopic device for pushing the cylindrical stone to be broken are also arranged in the barrel body. When the cylindrical stone drilling machine is used, a drilling machine drives the barrel to rotate to drill a rock, broken stone generated by drilling is sucked into the air suction holes, then the telescopic cutter set is driven to cut a cylindrical stone, an annular cutting groove is formed in the circumferential face of the cylindrical stone, and then the telescopic device is driven to stretch out to push the cylindrical stone to incline towards one side. Under the pushing of the telescopic device, the cylindrical stone is broken at the cutting groove, the driving shaft drilling machine drives the barrel body to move upwards, and under the supporting of the telescopic cutter group, the cylindrical stone moves upwards along with the barrel body, so that the coring efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the drilling field, in particular to the technical field of rock drilling, and specifically refers to a ring-cutting hollow drill used for granite drilling and coring. Background Art

[0002] In the large-diameter (3.8-meter) granite hard rock drilling construction, a variety of conventional construction methods were used, including ball-tooth roller pressure drilling, graded hole drilling, single-rope and double-rope impact drilling, etc. However, due to the high rock hardness of 200 MPa, slow penetration, long drilling cycle, weak impact drill bit, and easy breakage of the hammer body, the excavation efficiency is low.

[0003] In many small-diameter rock removal projects, rotary drilling rigs are used and coring technology is successfully used and widely used. However, in the construction of large-diameter 3.8-meter granite, the drilling depth is large, the rock to be drilled is hard, and it is difficult to break the rock, resulting in low coring efficiency. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides a ring-cutting hollow drill for granite drilling and coring, which improves the excavation efficiency and the coring efficiency.

[0005] The utility model is realized through the following technical scheme: a ring-cutting hollow drill for coring granite, comprising a cylinder connected to a drilling rig, a drill bit located on an open end face of the cylinder, a telescopic knife group for cutting grooves on a cylindrical stone, and a telescopic device for pushing the cylindrical stone to break.

[0006] When the utility model is in use, the drilling rig drives the cylinder to rotate, the opening of the cylinder is downward, the drill bit contacts the rock, and the rock is drilled. After the drilling is completed, an annular hole is formed on the rock. At this time, the rock in the hole becomes a cylindrical stone, and then the telescopic knife group is driven to cut the cylindrical stone, forming an annular cutting groove on the circumferential surface of the cylindrical stone, and then the telescopic device is driven to extend to push the cylindrical stone to tilt to one side. Under the push of the telescopic device, the cylindrical stone is broken at the cutting groove, and then the shaft drilling rig is driven to drive the cylinder to move upward. Under the support of the telescopic knife group, this part of the cylindrical stone moves upward with the cylinder, thereby improving the coring efficiency.

[0007] Preferably, the drill bit comprises a plurality of bases uniformly arranged along the circumferential direction on the open end surface of the barrel, and a plurality of diamond particles are fixedly connected to the bottom surface of the bases.

[0008] This preferred solution ensures strength by setting diamond particles, thereby improving drilling efficiency.

[0009] Preferably, the barrel comprises a first barrel section connected to the drilling rig, a second barrel section with a drill bit disposed on the bottom surface, and an intermediate barrel section detachably connecting the first barrel section and the second barrel section.

[0010] When this preferred solution is in use, the length of the cylinder body can be adjusted by replacing or adding an intermediate cylinder section, so that cylindrical stones at a greater depth can be extracted; the provision of the intermediate cylinder section also facilitates the removal of the first cylinder section, so that after the cylindrical stone is lifted up along with the cylinder body, the first cylinder section can be disassembled to facilitate the removal of the cylindrical stone from the cylinder body.

[0011] Preferably, the first barrel section and the second barrel section are both bolted to the middle barrel section via flanges. This preferred solution facilitates the assembly of the barrel through the provision of flanges.

[0012] Preferably, the telescopic knife assembly comprises a plurality of cutting knives arranged circumferentially on the inner wall of the cylinder, the cutting knife shaft is connected to the inner wall of the cylinder, and a telescopic cylinder is hinged on the inner wall of the cylinder to push the cutting knife to rotate into the cylinder.

[0013] Preferably, the telescopic knife assembly further comprises a connecting plate connecting two adjacent cutting knives, the connecting plate is hinged to the corresponding cutting knife, the extending end of the telescopic cylinder is hinged to a cutting knife, and a limiting groove for sliding of the connecting plate is provided on the inner wall of the cylinder.

[0014] In this preferred solution, the cutting knives are connected by setting a connecting plate, so that all the cutting knives are driven to extend into the cylinder by pushing a telescopic cylinder.

[0015] When this preferred solution is in use, when cutting is required, the telescopic cylinder is driven to extend, and the telescopic cylinder drives the cutting knife to rotate, so that the cutting knife extends into the cylinder body. At this time, under the rotation of the cylinder body, the cutting knife cuts the cylindrical stone, thereby cutting a cutting groove.

[0016] Preferably, the air suction hole on the open end surface of the cylinder is provided with a flow groove connecting the air suction hole and the air suction pump in the inner wall of the cylinder.

[0017] The preferred solution is convenient for the crushed stones produced by drilling to be sucked into the suction holes through the arrangement of the suction holes, the flow troughs and the suction pumps.

[0018] Preferably, the telescopic device comprises a hydraulic cylinder located in the cylinder wall and with the extended end extending toward the cylindrical stone.

[0019] This preferred solution facilitates the pushing of the cylindrical stone by setting a hydraulic cylinder.

[0020] Preferably, the width of the base is greater than the thickness of the inner wall of the cylinder. The arrangement of this preferred solution makes the inner diameter of the annular hole cut by the drill bit smaller than the inner diameter of the cylinder, and the outer diameter of the annular hole is larger than the outer diameter of the cylinder, thereby avoiding contact between the cylinder and the rock wall during the drilling process, and reducing the friction between the cylinder and the rock wall.

[0021] The beneficial effects of the utility model are as follows: the drilling rig drives the cylinder to rotate, the opening of the cylinder is downward, the drill bit contacts the rock, and holes are drilled in the rock, and the crushed stone produced by the drilling is sucked into the air suction hole. After the drilling is completed, an annular hole is formed on the rock. At this time, the rock in the hole becomes a cylindrical stone, and then the telescopic knife group is driven to cut the cylindrical stone, forming an annular cutting groove on the circumferential surface of the cylindrical stone, and then the telescopic device is driven to extend to push the cylindrical stone to tilt to one side, and under the push of the telescopic device, the cylindrical stone is broken at the cutting groove, and then the shaft drilling rig is driven to drive the cylinder to move upward, and under the support of the telescopic knife group, this part of the cylindrical stone moves upward with the cylinder, thereby improving the coring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic cross-sectional view of the structure of the utility model;

[0023] Figure 2 It is a top view schematic diagram of the telescopic knife assembly;

[0024] Figure 3 It is a top view schematic diagram of the extension of the cutting knife at the telescopic knife assembly;

[0025] Figure 4 This is a bottom view schematic diagram of the utility model;

[0026] As shown in the figure:

[0027] 1. First cylinder section, 2. Middle cylinder section, 3. Second cylinder section, 4. chute, 5. drill bit, 6. air intake hole, 7. connecting plate, 8. cutting knife, 9. telescopic cylinder, 10. hydraulic cylinder. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0029] See attached Figure 1-4 The utility model discloses a ring-cutting hollow drill for coring granite. The hollow drill comprises a cylinder with an opening downward. The diameter of the cylinder is 3.8 meters. The cylinder comprises a first cylinder section 1, a second cylinder section 3 located below the first cylinder section 1, and an intermediate cylinder section 2 connecting the second cylinder section 3 and the first cylinder section 1. The first cylinder section 1 and the second cylinder section 3 are both bolted to the intermediate cylinder section 2 through a flange.

[0030] The first barrel section 1 is connected to a drilling rig, which is a gas lift reverse circulation rotary drilling rig. The drilling rig drives the first barrel section 1 to rotate. The end face of the barrel opening is the lower end face of the second barrel section 3. A drill bit 5 is provided on the end face of the barrel opening. The drill bit 5 includes a plurality of bases uniformly arranged on the end face of the barrel opening along the circumferential direction. A plurality of diamond particles are fixed on the bottom face of the base. The width of the base is greater than the thickness of the inner wall of the barrel.

[0031] An air suction hole 6 is also provided on the open end surface of the cylinder, an air pump is provided above the cylinder, and a flow groove 4 connecting the air suction hole 6 and the air suction pump is provided in the inner wall of the cylinder, and the flow groove 4 extends from bottom to top.

[0032] A telescopic knife group for cutting grooves on the cylindrical stone is also provided in the second barrel section 3. The telescopic knife group includes six cutting knives 8 arranged circumferentially on the inner wall of the barrel. The blades of the cutting knives 8 are close to the inner wall of the barrel. A through hole is opened on the inner wall of the second barrel section 3 for the cutting knives 8 to extend out. The cutting knife 8 is axially connected to the inner wall of the barrel.

[0033] The telescopic knife group also includes a connecting plate 7 connecting two adjacent cutting knives 8. The cutting knife 8 is located between the connecting plate 7 and the cylindrical stone. The cutting knife 8 is hinged on the corresponding connecting plate 7. The connecting plate 7 is arc-shaped. A limiting groove for sliding the connecting plate 7 is also provided on the inner wall of the cylinder. The limiting groove is also arc-shaped, and the axis of the limiting groove is colinear with the axis of the cylinder.

[0034] A telescopic cylinder 9 is also hinged in the cylinder, and the extended end of the telescopic cylinder 9 is hinged to the first cutting knife 8. The first cutting knife 8 is hinged to only one connecting plate 7, and the sixth cutting knife 8 is also hinged to only one connecting plate 7. There is no connecting plate 7 between the first cutting knife 8 and the sixth cutting knife 8.

[0035] The first barrel section 1 is also provided with a telescopic device with an extended end extending inwards, and the telescopic device includes a hydraulic cylinder 10.

[0036] When the utility model is in use, the drill drives the cylinder to rotate, the opening of the cylinder is downward, the drill bit 5 contacts the rock and punches holes in the rock, and the crushed stones produced by the drilling are sucked into the air suction hole 6;

[0037] After the drilling is completed, an annular hole is formed on the rock. At this time, the rock in the hole becomes a cylindrical stone with a diameter of 2.8 meters. Then, the telescopic cylinder 9 is driven to extend, and the six cutting knives 8 are driven to rotate through the connecting plate 7, so that the cutting knives 8 rotate to the inside of the cylinder. As the drilling rig continues to rotate, the cutting knives 8 gradually cut the cylindrical stone, forming an annular cutting groove on the circumferential surface of the cylindrical stone. Then, the telescopic device is driven to extend to push the cylindrical stone to tilt to one side. Under the push of the telescopic device, the cylindrical stone is broken at the cutting groove. At this time, the distance between the cutting groove and the top of the cylindrical stone is 3 meters. Then, the shaft drilling rig is driven to drive the cylinder to move upward, that is, the corresponding cylindrical stone will be extracted before drilling into 3 meters. Under the support of the cutting knife 8, this part of the cylindrical stone moves upward with the cylinder, thereby improving the coring efficiency.

[0038] After the cylindrical stone is lifted to the ground, the first cylinder section 1 and the middle cylinder section 2 are disassembled, and then the cylindrical stone is taken out using a crane.

[0039] Granite rock with a diameter of 2.8 meters has 6.15 cubic meters per meter, and each cubic meter is about 3 tons. The weight of a three-meter core is about 56 tons, which is heavy. In addition, the maximum depth of extracted cylindrical stones can reach 100 meters. Therefore, the utility model provides a device and method for extracting granite rock with heavy weight and great depth.

[0040] Of course, the above description is not limited to the above examples. The technical features not described in the present invention can be achieved by or by adopting the existing technology, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not deviate from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A ring-cutting hollow drill for coring granite, characterized in that: It comprises a cylinder connected to a drilling machine, a drill bit (5) located on an open end surface of the cylinder, and a telescopic knife group for cutting grooves on a cylindrical stone and a telescopic device for pushing the cylindrical stone to break.

2. The ring-cutting hollow drill for granite coring according to claim 1, characterized in that: The drill bit (5) comprises a plurality of bases evenly arranged along the circumferential direction on the open end surface of the cylinder, and a plurality of diamond particles are fixedly connected to the bottom surface of the base.

3. The ring-cutting hollow drill for coring granite according to claim 1, characterized in that: The cylinder body comprises a first cylinder section (1) connected to a drilling machine, a second cylinder section (3) having a drill bit (5) disposed on the bottom surface, and an intermediate cylinder section (2) detachably connecting the first cylinder section (1) and the second cylinder section (3).

4. The ring-cutting hollow drill for coring granite according to claim 3, characterized in that: The first barrel section (1) and the second barrel section (3) are both bolted to the middle barrel section (2) via flanges.

5. The ring-cutting hollow drill for coring granite according to claim 3, characterized in that: The telescopic knife assembly comprises a plurality of cutting knives (8) arranged circumferentially within the inner wall of the cylinder. The cutting knives (8) are axially connected to the inner wall of the cylinder. A telescopic cylinder (9) is also hingedly connected to the inner wall of the cylinder for driving the cutting knives (8) to rotate within the cylinder.

6. The ring-cutting hollow drill for coring granite according to claim 5, characterized in that: The telescopic knife assembly further comprises a connecting plate (7) connecting two adjacent cutting knives (8), the connecting plate (7) being hinged to the corresponding cutting knives (8), the extended end of the telescopic cylinder (9) being hinged to one cutting knife (8), and a limiting groove for the sliding of the connecting plate (7) being provided on the inner wall of the cylinder.

7. The ring-cutting hollow drill for coring granite according to claim 6, characterized in that: An air suction hole (6) is also provided on the open end surface of the cylinder, and a flow groove (4) connecting the air suction hole (6) and the air suction pump is provided in the inner wall of the cylinder.

8. The ring-cutting hollow drill for coring granite according to claim 1, characterized in that: The telescopic device comprises a hydraulic cylinder (10) located in the cylinder wall and having an extended end extending toward the cylindrical stone.

9. The ring-cutting hollow drill for coring granite according to claim 2, characterized in that: The width of the base is greater than the thickness of the inner wall of the cylinder.

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