A hollow sampling drilling device

Abstract

The present invention discloses a hollow sampling drilling device, comprising a sampling outer shell, a sampling inner cylinder, a drill bit and a drill rod, wherein the sampling inner cylinder is fixed in the sampling outer shell, so that a sampling outer cavity is formed between the sampling inner cylinder and the sampling outer shell, and the interior of the sampling inner cylinder is the sampling inner cavity; four support plates are fixed at the lower end of the sampling inner cylinder, and the four support plates are in the same horizontal plane and arranged in a cross shape; a movable baffle is provided on the upper part of the four support plates, and one side of the movable baffle is hinged to the inner wall of the sampling inner cylinder through a hinge; the drill rod is a hollow rod with openings at both ends, and a spiral sheet is provided inside thereof, and the lower end of the drill rod is connected to the upper end of the sampling inner cylinder through a thread; an annular retaining ring is provided at the lower part of the thread of the sampling inner cylinder, and the circumference of the annular retaining ring is fixedly connected to the inner wall of the sampling inner cylinder. The present invention can complete the sampling process of coal and rock samples while drilling, thereby not only reducing the damage to the soil body, but also effectively shortening the sampling time.

Description

Technical Field

[0001] The invention relates to a drilling device, in particular to a hollow sampling drilling device. Background Art

[0002] Drilling is an important technical means in geological exploration. Drilling rigs are used to drill from the surface downward to form cylindrical holes in the strata to identify and divide the strata. Through the completed drilling holes, cores, ore samples, and soil samples can be obtained from different depths for analysis and research, which are used to determine the physical and mechanical properties and indicators of rocks and soil layers, which is convenient for experimental needs. Its advantages are that it can directly go deep into the underground to take samples for observation, intuitively and accurately obtain cultural accumulation data at a certain location, and understand the underground situation of a large area in a short time. It is suitable for understanding the specific distribution range, thickness, large building foundations, large tombs, and the shape and layout of ancient cities.

[0003] However, the existing drilling and sampling will cause great damage to the soil because it is divided into two processes. On the other hand, since the drilling and sampling are carried out separately, the sampling process is more complicated and the sampling time is longer. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a hollow sampling drilling device, which can complete the sampling process of coal and rock samples while drilling, thereby not only reducing the damage to the soil body, but also effectively shortening the sampling time.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a hollow sampling drilling device, including a sampling outer shell, a sampling inner tube, a drill bit and a drill rod,

[0006] The sampling inner cylinder is fixed in the sampling outer shell, so that a sampling outer cavity is formed between the sampling inner cylinder and the sampling outer shell, the interior of the sampling inner cylinder is the sampling inner cavity, the drill bit is fixed at the lower end of the sampling outer shell, the soil inlet opened on the drill bit is connected with the sampling outer cavity, and the top of the sampling outer cavity is opened with a soil discharge port;

[0007] Four support plates are fixed at the lower end of the sampling inner cylinder, and the four support plates are in the same horizontal plane and arranged in a cross shape; a movable baffle is provided on the upper part of the four support plates, and one side of the movable baffle is hinged to the inner wall of the sampling inner cylinder through a hinge;

[0008] The drill rod is a hollow rod with openings at both ends, and a spiral sheet is arranged inside the drill rod. The outer diameter of the drill rod is slightly smaller than the inner diameter of the sampling inner cylinder. The inner wall near the upper end of the sampling inner cylinder and the outer wall near the lower end of the drill rod are both provided with mounting threads, and the lower end of the drill rod is connected to the upper end of the sampling inner cylinder by threads; an annular retaining ring is arranged at the lower part of the thread of the sampling inner cylinder, and the circumference of the annular retaining ring is fixedly connected to the inner wall of the sampling inner cylinder.

[0009] Furthermore, the movable baffle is composed of four 90° fan-shaped pieces, the arc edges of the four 90° fan-shaped pieces are respectively hinged to the inner wall of the sampling inner cylinder through hinges, and the four 90° fan-shaped pieces form a disc shape when in a horizontal closed state.

[0010] Furthermore, the inner diameter of the annular retaining ring is smaller than the outer diameter of the drill rod.

[0011] Compared with the prior art, the present invention adopts a combination of a sampling shell, a sampling inner tube, a drill bit and a drill rod. When drilling and sampling, the drill rod is first fixedly connected to the sampling inner tube by a thread, and then the stratum to be explored is started to be drilled. During the downward drilling process of the drill bit, the drilled soil or broken coal rock enters the sampling outer cavity through the soil inlet. As the amount of soil or broken coal rock increases, the four 90° fan-shaped pieces will open upward under the pressure from the bottom. At this time, the soil or broken coal rock in the sampling outer cavity enters the sampling inner cavity. As the drilling continues, after the sampling inner cavity is filled, the sampled soil or coal rock enters the drill rod. Since the drill rod rotates continuously during the drilling process, the spiral piece inside it rotates continuously, and the sampled soil or coal rock entering the drill rod is transported upward to the ground, where the soil or coal rock is stored. At the same time, the soil that cannot enter the sampling inner cavity is discharged from the sampling outer cavity from the soil discharge port after the sampling outer cavity is filled, thus ensuring the drilling quality. The process continues. When the required drilling depth is reached, the drilling is stopped and the device is retracted to the ground. At this time, the upward pressure on the lower part of the four 90° fan-shaped pieces disappears, and the sampled soil or broken coal rock in the sampling cavity is closed downward due to the action of gravity. Finally, the four 90° fan-shaped pieces are limited by the support plate so that they are completely closed and then restored to a disc shape, sealing the lower end of the sampling cavity. In this way, when the device returns to the ground, the staff can take out the soil or coal rock in the drill rod and the sampling cavity in turn, and the soil or coal rock in the sampling cavity is the sample reached by the drilling, and the soil or coal rock in the drill rod and that has been transported to the ground before are samples collected from top to bottom when the drilling depth continues to increase. Therefore, the device can sample soil or coal rock at different depths in turn during the drilling process, thereby not only reducing the damage to the soil body, but also effectively shortening the sampling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention;

[0013] Figure 2 yes Figure 1 A top view of the middle support plate and the movable baffle;

[0014] Figure 3 It is a schematic diagram of the structure of the spiral sheet in the present invention.

[0015] In the figure: 1. drill rod, 2. spiral piece, 3. sampling inner cylinder, 4. annular retaining ring, 5. 90° fan-shaped piece, 6. support plate, 7. drill bit, 8. sampling outer cavity, 9. discharge port, 10. sampling inner cavity, 11. sampling outer shell. DETAILED DESCRIPTION

[0016] The present invention will be further described below.

[0017] by Figure 1 The upper part of the patent is described in the upper part, such as Figures 1 to 3 As shown, the present invention comprises a sampling housing 11, a sampling inner tube 3, a drill bit 7 and a drill rod 1.

[0018] The sampling inner cylinder 3 is fixed in the sampling outer shell 11, so that a sampling outer cavity 8 is formed between the sampling inner cylinder 3 and the sampling outer shell 11, the interior of the sampling inner cylinder 3 is a sampling inner cavity 10, the drill bit 7 is fixed at the lower end of the sampling outer shell 11, the soil inlet opened on the drill bit 7 is connected to the sampling outer cavity 8, and the top of the sampling outer cavity 8 is opened.

[0019] Four support plates 6 are fixed to the lower end of the sampling inner cylinder 3. The four support plates 6 are in the same horizontal plane and arranged in a cross shape. A movable baffle is provided on the upper part of the four support plates 6. One side of the movable baffle is hinged to the inner wall of the sampling inner cylinder 3 through a hinge.

[0020] The drill rod 1 is a hollow rod with openings at both ends, and a spiral sheet 2 is provided inside the drill rod 1. The outer diameter of the drill rod 1 is slightly smaller than the inner diameter of the sampling inner tube 3. The inner wall near the upper end of the sampling inner tube 3 and the outer wall near the lower end of the drill rod 1 are both provided with mounting threads. The lower end of the drill rod 1 is connected to the upper end of the sampling inner tube 3 by threads; an annular retaining ring 4 is provided at the lower part of the thread of the sampling inner tube 3, and the circumference of the annular retaining ring 4 is fixedly connected to the inner wall of the sampling inner tube 3.

[0021] like Figure 2 As shown, further, the movable baffle is composed of four 90° fan-shaped pieces 5, the arc edges of the four 90° fan-shaped pieces 5 are respectively hinged to the inner wall of the sampling inner tube 3 through hinges, and the four 90° fan-shaped pieces 5 form a disc shape when in a horizontal closed state. This structure is used to facilitate the soil or coal rock sampled to push the fan-shaped pieces into the sampling cavity during drilling. When the sampling is completed, the four 90° fan-shaped pieces 5 can be completely closed to form a disc, and the sampling cavity 10 can be better sealed to prevent the soil or coal rock sampled from falling into the borehole during the process of the device being retracted to the ground.

[0022] Furthermore, the inner diameter of the annular retaining ring 4 is smaller than the outer diameter of the drill pipe 1. In this way, the drill pipe 1 can be limited during the threaded connection with the sampling inner cylinder 3, thereby ensuring the connection stability with the sampling inner cylinder 3.

[0023] When drilling and sampling, first, the drill rod 1 is fixedly connected to the sampling inner tube 3 by threads, and then drilling of the stratum to be explored is started. During the downward drilling process of the drill bit 7, the drilled soil or broken coal rock enters the sampling outer cavity 8 through the soil inlet. As the amount of soil or broken coal rock increases, the four 90° fan-shaped pieces 5 will open upward due to the pressure from the bottom. At this time, the soil or broken coal rock in the sampling outer cavity 8 enters the sampling inner cavity 10. As the drilling continues, after the sampling inner cavity 10 is filled, the sampled soil or coal rock enters the drill rod 1. Since the drill rod 1 rotates continuously during the drilling process, the spiral piece 2 inside it rotates continuously, and the sampled soil or coal rock entering the drill rod 1 is transported upward to the ground, where the soil or coal rock is stored. At the same time, the soil that cannot enter the sampling inner cavity 10 is discharged from the soil discharge port 9 after the sampling outer cavity 8 is filled. The sampling outer cavity 8 is pulled out to ensure uninterrupted drilling. When the required drilling depth is reached, drilling is stopped and the device is retracted to the ground. At this time, the upward pressure on the lower part of the four 90° fan-shaped pieces 5 disappears, and the sampling soil or broken coal rock in the sampling inner cavity 10 is closed downward by the four 90° fan-shaped pieces 5 due to gravity. Finally, the four 90° fan-shaped pieces 5 are limited by the support plate 6 to be completely closed and then restored to form a disc shape, sealing the lower end of the sampling inner cavity 10. In this way, when the device returns to the ground, the staff can take out the soil or coal rock in the drill rod 1 and the sampling inner cavity 10 in turn, and the soil or coal rock in the sampling inner cavity 10 is the sample reached by the drilling, and the soil or broken coal rock in the drill rod 1 and that has been transported to the ground before are, from top to bottom, samples collected when the drilling depth continues to increase.

Claims

1. A hollow sampling drilling device, characterized in that: It comprises a sampling outer shell (11), a sampling inner tube (3), a drill bit (7) and a drill rod (1), The sampling inner cylinder (3) is fixed in the sampling outer shell (11), so that a sampling outer cavity (8) is formed between the sampling inner cylinder (3) and the sampling outer shell (11), the interior of the sampling inner cylinder (3) is a sampling inner cavity (10), the drill bit (7) is fixed at the lower end of the sampling outer shell (11), the soil inlet opening provided on the drill bit (7) is connected to the sampling outer cavity (8), and the top of the sampling outer cavity (8) is provided with a soil discharge opening (9); Four support plates (6) are fixed to the lower end of the sampling inner cylinder (3), and the four support plates (6) are located in the same horizontal plane and are arranged in a cross shape; a movable baffle is provided on the upper part of the four support plates (6), and the movable baffle is composed of four 90° fan-shaped pieces (5), and the arc edges of the four 90° fan-shaped pieces (5) are respectively hinged to the inner wall of the sampling inner cylinder (3) through hinges, and the four 90° fan-shaped pieces (5) form a disc shape when in a horizontal closed state; The drill rod (1) is a hollow rod with openings at both ends, and a spiral sheet (2) is provided inside the drill rod (1). The outer diameter of the drill rod (1) is slightly smaller than the inner diameter of the sampling inner tube (3). The inner wall near the upper end of the sampling inner tube (3) and the outer wall near the lower end of the drill rod (1) are both provided with mounting threads. The lower end of the drill rod (1) is connected to the upper end of the sampling inner tube (3) through threads. An annular retaining ring (4) is provided at the lower part of the thread of the sampling inner tube (3), and the circumference of the annular retaining ring (4) is fixedly connected to the inner wall of the sampling inner tube (3). The inner diameter of the annular retaining ring (4) is smaller than the outer diameter of the drill rod (1).

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