Rock core drilling device for geological exploration

Abstract

The invention relates to the technical field of rock core drilling for geological prospecting, in particular to a rock core drilling device for geological prospecting, which comprises an inner rock core barrel and a half-barrel cover plate, through the cooperation of the half-barrel cover plate and the inner rock core barrel, the rock core is discharged without impact, the integrity of the loose rock core is protected, and meanwhile, the inner rock core barrel is prevented from being knocked and damaged; the hinged half-barrel cover plates are opened along the arc-shaped grooves, the rock core can be discharged by means of self-weight or slight thrust without external force impact, and the uniformly-distributed structure of the half-barrel cover plates is matched with the inner rock core barrel, so that the rock core can be wrapped and supported, radial extrusion during coring is avoided, the rock core is uniformly stressed, fragile geological information is reserved, manual beating after drill lifting is not needed, and the drilling efficiency is improved. The half-barrel cover plate and the inner core barrel can release the core through hinged rotation, so that the barrel wall is prevented from being impacted and abraded, the service life of the inner core barrel is prolonged, and the phenomenon that core fragments splash or a tool rebounds in the knocking process is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of core drilling for geological exploration, in particular to a core drilling device for geological exploration. Background Art

[0002] Core drilling for geological exploration refers to the use of special coring tools to bring underground rocks to the surface in blocks during the drilling process. These blocks of rock are called cores, which can be used to measure various properties of rocks, intuitively study underground structures and rock deposition environments, and understand the fluid properties therein. In the process of mineral exploration and development, it is necessary to carry out drilling work according to the geologically designed stratigraphic levels and depths, lower coring tools into the well, and drill out rock samples.

[0003] The traditional coring method requires hammering the inner core barrel. External force impact will cause the loose core to be squeezed, broken or particles to fall off, especially for samples containing cracks and poor cementation, which can easily destroy the original structure. It may also cause a sudden change in the pore water pressure inside the core, causing the expansion of fine cracks. In addition, when hammering the core, the hammering position and force need to be repeatedly adjusted. Especially in deep hole drilling, the hammering operation after frequent drill lifting may take several hours and requires manual assistance, which is inefficient. Traditional hammering will also cause fatigue cracks in the inner core barrel, especially in high-strength alloy materials, which can easily cause stress concentration. The hammering operation may cause core fragments to splash or the tool to rebound, posing a risk of injury. Summary of the Invention

[0004] In view of the above problems, the present invention provides a core drilling device for geological exploration to solve the technical problem in related art that the manual hammering method used during coring destroys the original structure of the core sample, reduces coring efficiency, and damages the inner core barrel. To achieve the above objectives, the present invention provides the following technical solutions.

[0005] The cam is provided with a support member which is adapted to engage said support member and to engage said support member when said action is desired.

[0006] According to an embodiment of the present invention, a leak-proof plate is fixedly installed at the bottom of the outer core barrel to prevent loose core material from entering between the inner core barrel and the outer core barrel from the gap between the core claw and the outer core barrel during coring, causing contamination.

[0007] According to an embodiment of the present invention, a plurality of arc grooves are evenly opened along the linear direction of the inner core barrel, a half-cylinder cover plate is hinged in the arc groove, and the contact ends between the half-cylinder cover plate and the inner core barrel are fixedly installed with matching blocks, and the contact ends between the half-cylinder cover plate and the inner core barrel are provided with matching grooves that match the matching blocks.

[0008] According to an embodiment of the present invention, the half-cylinder cover plate and the rear end of the inner core barrel are both provided with threaded holes, and threaded bolts are threadedly connected in the threaded holes.

[0009] According to an embodiment of the present invention, a spiral groove is provided at the outer end of the inner core barrel and between the half-barrel cover plates, and the spiral groove is threadedly connected to the centralizer.

[0010] According to an embodiment of the present invention, a guide cylinder is fixedly installed on the upper end of the centralizer, the inner diameter of the upper end opening of the guide cylinder is larger than the inner diameter of the lower end opening, and the outer end of the centralizer is slidably connected to the inner wall of the outer core barrel.

[0011] According to an embodiment of the present invention, the core claw includes a fixed abutment plate, a fixed abutment plate is fixedly installed on the left side of the lower end of the inner core barrel, a movable abutment plate is slidably connected to the right side of the lower end of the inner core barrel, and the leak-proof plate and the movable abutment plate are slidably connected to each other.

[0012] According to an embodiment of the present invention, a plug-in board is fixedly mounted symmetrically front and back on the left end of the movable support plate, and a plug-in slot cooperating with the plug-in board is symmetrically opened front and back on the right end of the fixed support plate.

[0013] According to an embodiment of the present invention, the upper end of the fixed support plate and located directly above the plug-in slot are connected to a pressure block for sliding up and down, a linkage plate is fixedly installed on the upper left end of the pressure block, a plurality of connecting springs are evenly fixedly connected between the linkage plate and the fixed support plate from front to back, and a wedge block is connected to the right end of the inner core barrel for sliding up and down, and the inclined surface of the wedge block slides up and down between the movable support plate.

[0014] According to an embodiment of the present invention, the hydraulic drive includes a hydraulic cylinder, which is fixedly installed on the lower right end of the inner core barrel, and a piston rod is fixedly installed on the telescopic rod of the hydraulic cylinder, and the lower end of the piston rod is fixedly connected to the wedge block.

[0015] It can be seen from the above technical solutions that the present invention has the following advantages:

[0016] 1. In the present invention, the half-cylinder cover plate cooperates with the inner core barrel to discharge the core without impact, protecting the integrity of the loose core while avoiding damage to the inner core barrel by knocking. The hinged half-cylinder cover plate opens along the arc groove, and the core can be discharged by relying on its own weight or slight thrust without external impact. The evenly distributed structure of the half-cylinder cover plate cooperates with the inner core barrel to form a wrapping support for the core, avoiding radial extrusion during coring, and making the core evenly stressed, thereby retaining fragile geological information such as gas and liquid inclusions. During the whole process, there is no need for manual knocking after lifting the drill, thereby shortening the coring time. The half-cylinder cover plate and the inner core barrel can release the core by hinged rotation, avoiding impact wear on the barrel wall, thereby extending the service life of the inner core barrel, and will not cause core fragments to splash or tool rebound during knocking.

[0017] In addition to the technical problems solved by the embodiments of the present application described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by a core drilling device for geological exploration provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the main stereoscopic structure of the present invention is shown.

[0020] Figure 2 A schematic diagram of the main three-dimensional structure of the present invention with the outer core barrel removed is shown.

[0021] Figure 3 A schematic diagram of the main cross-sectional structure of the present invention is shown.

[0022] Figure 4 A schematic diagram of the top cross-sectional structure of the threaded hole groove and the threaded bolt is shown.

[0023] Figure 5 A schematic diagram of the top cross-sectional structure of the plug-in board and the plug-in slot is shown.

[0024] Figure 6 A schematic diagram of a top cross-sectional structure of the leakage prevention plate is shown.

[0025] Figure 7A three-dimensional schematic diagram of the opening and closing state of the half-cylinder cover is shown.

[0026] The above drawings include the following reference numerals:

[0027] 1. Coring drill bit; 2. Outer core barrel; 21. Leakage-proof plate; 3. Suspension device; 4. Suspension bearing; 5. Inner core barrel; 51. Half-barrel cover plate; 511. Threaded hole groove; 512. Threaded bolt; 52. Arc groove; 53. Matching block; 54. Matching groove; 55. Spiral groove; 6. Back pressure valve; 7. Centralizer; 71. Guide cylinder; 8. Core claw; 81. Fixed abutment plate; 811. Pressure block; 812. Linkage plate; 813. Connecting spring; 814. Wedge block; 82. Moving abutment plate; 821. Plug-in plate; 822. Plug-in groove; 9. Hydraulic drive; 91. Hydraulic cylinder; 92. Piston rod. DETAILED DESCRIPTION

[0028] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] See Figure 1 、 Figure 2 and Figure 3 A core drilling device for geological exploration includes a core drill bit 1, an outer core barrel 2, a suspension device 3, a suspension bearing 4, an inner core barrel 5, a back pressure valve 6, a centralizer 7 and a core claw 8; the upper end of the core drill bit 1 is detachably connected to the outer core barrel 2, the upper inner end of the outer core barrel 2 is fixedly installed with a suspension device 3, the suspension device 3 is fixedly installed with a suspension bearing 4, and the lower end of the suspension bearing 4 is detachably connected to the inner core barrel 5; the inner core barrel 5 is fixedly installed with a back pressure valve 6, and the outer end of the inner core barrel 5 is linearly uniform along its outer end. There are multiple centralizers 7 threadedly connected to the inner core barrel 5 for maintaining it in a centered state. The lower end of the inner core barrel 5 is connected to a core claw 8 for blocking the bottom of the loose core to prevent it from falling. The inner core barrel 5 has multiple half-cylinder cover plates 51 hinged evenly along its linear line for easy opening and coring. The lower end of the inner core barrel 5 is fixedly installed with a hydraulic drive 9 for controlling the opening and closing of the core claws 8. The half-cylinder cover plate 51 cooperates with the inner core barrel 5 to discharge the core without impact, thereby protecting the integrity of the loose core and preventing the inner core barrel 5 from being damaged by knocking.

[0030] See Figure 3 and Figure 6A leak-proof plate 21 is fixedly installed at the bottom of the outer core barrel 2 to prevent loose core material from entering the space between the inner core barrel 5 and the outer core barrel 2 from the gap between the core claw 8 and the outer core barrel 2 when coring, causing contamination. The leak-proof plate 21 is composed of a cylindrical plate and a plurality of connecting rods. The connecting rods are evenly arranged along the circumference of the cylindrical plate. The connecting rods are fixedly connected to the outer core barrel 2 and the cylindrical plate to ensure that the flushing fluid can smoothly enter the hole of the coring drill bit 1 from between the outer core barrel 2 and the inner core barrel 5, cool the coring drill bit 1 and flush away the rock chips.

[0031] First, install an ordinary drill bit at the bottom of the outer core barrel 2. After the ordinary drill bit drills to above the target coring depth, remove the outer core barrel 2, then replace the ordinary drill bit with the coring drill bit 1, install a leak-proof plate 21 at the bottom of the outer core barrel 2, and then install the inner core barrel 5 in the outer core barrel 2 through the suspension bearing 4. Check whether the centralizer 7 is evenly distributed and remains centered. Install the back pressure valve 6 on the upper part of the inner core barrel 5, test the opening and closing flexibility of the back pressure valve 6, connect the hydraulic drive 9 system pipeline, test the opening and closing pressure of the core claw 8, and ensure that there is no jamming at the hinge of the half-cylinder cover plate 51.

[0032] The core drill bit 1 is slowly lowered to the target coring depth. The outer core barrel 2 rotates with the core drill bit 1 to cut the formation. The inner core barrel 5 is kept relatively stationary by the suspension bearing 4. The centralizer 7 keeps the inner core barrel 5 centered to avoid eccentric wear of the core. Flushing fluid is continuously pumped through an external mud pump to cool the core drill bit 1 and flush away the cuttings. When the core drill bit 1 drills downward, the core enters the inner core barrel 5 through the center hole of the core drill bit 1. The leak-proof plate 21 prevents the cuttings from entering the outer core barrel 2 and prevents the flushing fluid from entering the inner core barrel 5. When the inner core barrel 5 is almost full, prepare to stop drilling.

[0033] See Figure 2 、 Figure 4 and Figure 7 The inner core barrel 5 is provided with a plurality of arc grooves 52 evenly arranged along its linear direction, and a half-cylinder cover plate 51 is hinged in the arc groove 52, and a threaded hole groove 511 is provided on the half-cylinder cover plate 51 and the rear end of the inner core barrel 5, and a threaded bolt 512 is threadedly connected in the threaded hole groove 511, and a matching block 53 is fixedly installed on the contact end between the half-cylinder cover plate 51 and the inner core barrel 5, and a matching groove 54 is provided on the contact end between the half-cylinder cover plate 51 and the inner core barrel 5 to match the matching block 53. The matching block 53 cooperates with the matching groove 54, so that the half-cylinder cover plate 51 and the inner core barrel 5 are aligned and connected, and the threaded bolt 512 ensures the sealing between the half-cylinder cover plate 51 and the inner core barrel 5. A spiral groove 55 is provided on the outer end of the inner core barrel 5 and is located between the half-cylinder cover plate 51, and the spiral groove 55 is threadedly connected to the stabilizer 7.

[0034] See Figure 3The upper end of the centralizer 7 is fixedly installed with a guide cylinder 71. The inner diameter of the upper opening of the guide cylinder 71 is larger than the inner diameter of the lower opening, which is convenient for connection with the inner core cylinder 5. The outer end of the centralizer 7 is slidably connected to the inner wall of the outer core cylinder 2.

[0035] See Figure 3 and Figure 5 The core claw 8 includes a fixed abutment plate 81, a fixed abutment plate 81 is fixedly installed on the left side of the lower end of the inner core barrel 5, a movable abutment plate 82 is slidably connected to the right side of the lower end of the inner core barrel 5, the leak-proof plate 21 is slidably connected to the movable abutment plate 82, a plug-in plate 821 is fixedly installed symmetrically on the left end of the movable abutment plate 82, and a plug-in slot 822 that matches the plug-in plate 821 is symmetrically opened on the right end of the fixed abutment plate 81.

[0036] See Figure 3 and Figure 4 The upper end of the fixed support plate 81 and just above the plug-in slot 822 are connected to a pressure block 811 for sliding up and down. A linkage plate 812 is fixedly installed on the upper left end of the pressure block 811. A plurality of connecting springs 813 are evenly fixedly connected between the linkage plate 812 and the fixed support plate 81 from front to back. The right end of the inner core barrel 5 is connected to a wedge block 814 for sliding up and down. The inclined surface of the wedge block 814 slides up and down with the movable support plate 82.

[0037] See Figure 3 The hydraulic drive 9 includes a hydraulic cylinder 91, which is fixedly installed on the right end of the lower side of the inner core barrel 5. The telescopic rod of the hydraulic cylinder 91 is fixedly installed with a piston rod 92, and the lower end of the piston rod 92 is fixedly connected to the wedge block 814.

[0038] It should be noted that the hydraulic cylinder 91 , piston rod 92 , back pressure valve 6 , suspension bearing 4 and suspension device 3 are all existing technologies.

[0039] The piston rod 92 is pushed downward by the hydraulic cylinder 91, driving the wedge block 814 to move downward, thereby driving the movable plate 82 to move to the left, so that the plug-in plate 821 is inserted into the plug-in groove 822, clamping the bottom of the core, so that the inner core barrel 5 is in a sealed state. At this time, the drill tool is slowly lifted and the back pressure valve 6 is automatically closed to prevent the core from rising due to the negative pressure in the inner barrel when the drill is lifted.

[0040] After the drill tool is lifted to the surface, the inner core barrel 5 is separated from the outer core barrel 2, the inner core barrel 5 is taken out, and the inner core barrel 5 is placed horizontally with the half-cylinder cover 51 facing upward. The half-cylinder cover 51 of the inner core barrel 5 is opened and flipped outward along the hinge of the arc groove 52. The staff can take out the cores in the half-cylinder cover 51 in sequence and push the adjacent cores to the other half-cylinder cover 51 at the opened half-cylinder cover 51 to take them out to avoid knocking and breaking the loose cores. The cores are then placed in sequence, marked with the up and down directions and footage depth. The loose cores are immediately sealed with plastic wrap or a core box to prevent changes in water content. The staff can also open the half-cylinder cover 51 in sequence and take out the cores in the half-cylinder cover 51 farthest from the core claw 8. The core claw 8 is opened by hydraulic drive 9, and then an external pusher is set at the gap to push it out from the bottom of the inner core barrel 5. The remaining opened half-cylinder cover 51 allows air to enter the inner core barrel 5, so that air can flow between the core in the inner core barrel 5 and the inner wall of the inner core barrel 5, avoiding the formation of a long-section sealing state between the core and the inner core barrel 5, thereby reducing the pushing difficulty of the pusher.

[0041] In the description of the present invention, it should be understood that the terms "center", "middle", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "end", "axial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0042] Furthermore, the terms "first," "second," "number one," "number two," "one," and "two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being described. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0043] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "connected," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, integral or sliding connections; they may refer to mechanical or electrical connections; they may refer to direct or indirect connections via an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A core drilling device for geological exploration, characterized in that , including coring drill bit, outer core barrel, suspension device, suspension bearing, inner core barrel, back pressure valve, centralizer and core claw; The upper end of the core drill bit is detachably connected to an outer core barrel, the inner end of the upper side of the outer core barrel is fixedly installed with a suspension device, the suspension device is provided with a suspension bearing, and the lower end of the suspension bearing is detachably connected to the inner core barrel; A back pressure valve is fixedly installed in the inner core barrel, and a plurality of centralizers for maintaining the inner core barrel in a centered state are connected to the outer end of the inner core barrel along its linear uniform thread connection, and a core claw for blocking the bottom of the loose core to prevent it from falling is provided at the lower end of the inner core barrel, and a plurality of half-cylinder cover plates for facilitating opening and coring are evenly provided on the upper end of the inner core barrel along its linear uniform arrangement, and a hydraulic drive for controlling the opening and closing of the core claws is provided at the lower end of the inner core barrel, and the half-cylinder cover plates cooperate with the inner core barrel to discharge the core without impact, thereby protecting the integrity of the loose core and preventing the inner core barrel from being damaged by knocking.

2. A core drilling device for geological exploration according to claim 1, characterized in that: The bottom of the outer core barrel is fixedly installed with a leak-proof plate to prevent loose core material from entering between the inner core barrel and the outer core barrel from the gap between the core claw and the outer core barrel when the core claw is coring, causing pollution.

3. A core drilling device for geological exploration according to claim 1, characterized in that: The inner core barrel is provided with a plurality of arc grooves evenly arranged along its linear direction, a half-cylinder cover plate is hinged in the arc groove, the contact ends between the half-cylinder cover plate and the inner core barrel are fixedly installed with matching blocks, and the contact ends between the half-cylinder cover plate and the inner core barrel are provided with matching grooves that match the matching blocks.

4. A core drilling device for geological exploration according to claim 1, characterized in that: The half-cylinder cover plate and the rear end of the inner core cylinder are both provided with threaded holes, and threaded bolts are connected to the threaded holes.

5. The core drilling device for geological exploration according to claim 1, characterized in that: A spiral groove is provided at the outer end of the inner core barrel and between the half-barrel cover plates, and the spiral groove is threadedly connected to the centralizer.

6. A core drilling device for geological exploration according to claim 1, characterized in that: A guide cylinder is fixedly installed on the upper end of the centralizer. The inner diameter of the upper end opening of the guide cylinder is larger than the inner diameter of the lower end opening. The outer end of the centralizer is slidably connected to the inner wall of the outer core cylinder.

7. A core drilling device for geological exploration according to claim 2, characterized in that: The core claw includes a fixed abutment plate, a fixed abutment plate is fixedly installed on the left side of the lower end of the inner core barrel, a movable abutment plate is slidably connected to the right side of the lower end of the inner core barrel, and the leak-proof plate is slidably connected to the movable abutment plate.

8. A core drilling device for geological exploration according to claim 7, characterized in that: The left end of the movable support plate is fixedly mounted with a plug-in plate symmetrically in front and back, and the right end of the fixed support plate is symmetrically provided with a plug-in slot matched with the plug-in plate.

9. A core drilling device for geological exploration according to claim 8, characterized in that: The upper end of the fixed support plate and the position directly above the plug-in slot are connected to a pressure block for sliding up and down. A linkage plate is fixedly installed on the upper left end of the pressure block. A plurality of connecting springs are evenly fixedly connected between the linkage plate and the fixed support plate from front to back. The right end of the inner core barrel is connected to a wedge block for sliding up and down, and the inclined surface of the wedge block slides up and down with the movable support plate.

10. The core drilling device for geological exploration according to claim 9, characterized in that: The hydraulic drive comprises a hydraulic cylinder, the lower right end of the inner core barrel is fixedly mounted with the hydraulic cylinder, the telescopic rod of the hydraulic cylinder is fixedly mounted with a piston rod, and the lower end of the piston rod is fixedly connected to the wedge block.

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