A core drilling device for preventing drill dropping in a caving zone of a goaf

Abstract

This utility model discloses an anti-drill-drop coring device for drilling in goaf collapse zones, comprising a drill rod, a connecting joint, a coring cylinder, and a drill bit. The drill rod is connected to the coring cylinder via the connecting joint, and the drill bit is installed at the bottom of the coring cylinder. Double-ear clamps are provided on the lower side of the drill rod, the upper and lower ends of the connecting joint, and the upper side of the coring cylinder. Connecting rods are connected between the double-ear clamps on the upper side of the drill rod and the connecting joint, and between the double-ear clamps on the lower side of the coring cylinder and the connecting joint. This utility model adopts a double-connection method, which ensures that the coring cylinder remains connected even if the threads break due to torque. It can prevent the drill rod, connecting joint, and coring cylinder from separating under complex working conditions, thereby avoiding drill bit separation and loss, and preventing secondary problems such as borehole abandonment and borehole wall collapse. It helps improve the efficiency and accuracy of geological exploration in goaf areas and is easy to use.

Description

Technical Field

[0001] This utility model relates to the field of drill pipe technology, specifically to a core sampling device for drilling in the collapse zone of a goaf. Background Technology

[0002] In recent years, with the rapid advancement of urban economic construction and the continuous expansion of urban scale in my country, the problems of land resource scarcity and increasing utilization pressure have become increasingly prominent. Under this situation, some buildings, structures, and engineering facilities such as highways have had to be planned and constructed above mining subsidence areas. However, the complex geological conditions of mining subsidence areas have brought many challenges to engineering construction. Before treating mining subsidence areas, geological exploration is usually required. However, when there are collapse zones, the rock strata are broken and the structure is loose, making it easy for problems such as stuck drill bits and dropped drill bits to occur during drilling, resulting in the loss of drill bits and failure to obtain core samples. In existing technologies, some devices achieve anti-detachment functions through threaded connections. However, the single threaded connection used is prone to loosening or damage under severe vibration, resulting in the separation of the core sample tube from the drill rod. This connection method cannot adapt to complex working conditions and may lead to secondary problems such as borehole abandonment and borehole wall collapse, seriously affecting the efficiency and accuracy of geological exploration in mining subsidence areas. Utility Model Content

[0003] The technical problem this invention aims to solve is to overcome existing defects and provide an anti-drill-drop coring device for drilling in goaf collapse zones. It employs a dual-connection method, ensuring that the coring cylinder remains connected even when the threads break due to torque. This prevents the drill rod, connecting joint, and coring cylinder from separating under complex working conditions, thus avoiding drill bit separation and loss, and preventing secondary problems such as borehole abandonment and borehole wall collapse. It helps improve the efficiency and accuracy of geological exploration in goaf areas, is easy to use, and effectively solves the problems in the background technology.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a core sampling device for drilling in a goaf collapse zone to prevent drill drop, comprising a drill rod, a connecting joint, a core sampling cylinder, and a drill bit. The drill rod is connected to the core sampling cylinder through the connecting joint, and the drill bit is installed at the bottom of the core sampling cylinder. Double-ear clamps are provided on the lower side of the drill rod, the upper and lower ends of the side of the connecting joint, and the upper side of the core sampling cylinder. Connecting rods are connected between the double-ear clamps on the upper side of the drill rod and the side of the connecting joint, and between the double-ear clamps on the lower side of the core sampling cylinder and the side of the connecting joint.

[0005] As a preferred technical solution of this utility model, the drill rod, connecting joint and core cylinder are all provided with annular grooves on their peripheral surfaces corresponding to the double-ear clamps, and the double-ear clamps are movably engaged in the annular grooves.

[0006] As a preferred technical solution of this utility model, the double-ear clamp includes two symmetrically arranged arc-shaped clamps, each with a through hole at both ends. The connecting rod has insertion holes at the corresponding positions of the through holes at both ends. A bolt is inserted through the insertion hole in each through hole, and the double-ear clamp is connected to the connecting rod by a bolt and nut.

[0007] As a preferred embodiment of this utility model, the drill rod and the connecting joint, as well as the connecting joint and the core cylinder, are connected by sawtooth-shaped threads.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] This utility model presents an anti-drill-drop coring device for drilling in goaf collapse zones. It adopts a dual-connection method, which can ensure that the coring cylinder remains connected even when the threads break due to torque. It can prevent the drill rod, connecting joint and coring cylinder from separating under complex working conditions, thereby avoiding the loss of drill bit and secondary problems such as borehole scrapping and borehole wall collapse. It helps to improve the efficiency and accuracy of geological exploration in goaf areas and is easy to use. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the double-ear clamp in this utility model.

[0012] In the diagram: 1. Drill rod, 2. Connecting joint, 3. Core tube, 4. Drill bit, 5. Annular groove, 6. Double ear clamp, 61. Through hole, 7. Connecting rod, 71. Insertion hole. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-2This utility model provides a technical solution: a core sampling device for drilling in the collapse zone of a goaf, including a drill rod 1, a connecting joint 2, a core sampling cylinder 3 and a drill bit 4. The drill rod 1 is connected to the core sampling cylinder 3 through the connecting joint 2, and the drill bit 4 is installed at the bottom of the core sampling cylinder 3. The lower side of the drill rod 1, the upper and lower ends of the side of the connecting joint 2 and the upper side of the core sampling cylinder 3 are all provided with double-ear clamps 6, and connecting rods 7 are connected between the double-ear clamps 6 at the upper side of the drill rod 1 and the connecting joint 2, and between the double-ear clamps 6 at the lower side of the core sampling cylinder 3 and the connecting joint 2.

[0015] Furthermore, the drill pipe 1, the connecting joint 2, and the core barrel 3 are all provided with annular grooves on their corresponding peripheral surfaces to the double-ear clamp 6, and the double-ear clamp 6 is movably engaged in the annular grooves to prevent the double-ear clamp 6 from sliding up and down.

[0016] Furthermore, the double-ear clamp 6 includes two symmetrically arranged arc-shaped clamps, each with a through hole 61 at both ends. The connecting rod 7 has insertion holes 71 at the corresponding positions at both ends of the through holes 61. Bolts are inserted through the insertion holes 71 in the through holes 61. The double-ear clamp 6 and the connecting rod 7 are connected by bolts and nuts. The double-ear clamp 6 is snapped into the annular groove, and the connecting rod 7 is inserted between the two arc-shaped clamps. Then, it is fixed by bolts and nuts to solidify.

[0017] Furthermore, the drill pipe 1 and the connecting joint 2, as well as the connecting joint 2 and the core barrel 3, are all connected by sawtooth threads. The dual mechanical connection of threads and double-ear clamps 6 can prevent the drill pipe 1, the connecting joint 2 and the core barrel 3 from separating, thereby avoiding the loss of the drill bit.

[0018] This utility model adopts a dual connection method, which can ensure that the core tube remains connected even when the thread breaks due to torque. It can prevent the drill rod 1, the connecting joint 2 and the core tube 3 from separating under complex working conditions, thereby avoiding the loss of drill bit separation and secondary problems such as borehole scrapping and hole wall collapse. It helps to improve the efficiency and accuracy of geological exploration in goaf areas and is easy to use.

[0019] The parts not disclosed in this utility model are all prior art, and their specific structures, materials, and working principles will not be described in detail. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing drill pipe falling in gob caving zone drilling, comprising drill pipe (1), connecting joint (2), coring barrel (3) and drill bit (4), characterized in that: The drill rod (1) is connected to the core tube (3) through the connecting joint (2), and the drill bit (4) is installed at the bottom of the core tube (3). The lower side of the drill rod (1), the upper and lower ends of the side of the connecting joint (2) and the upper side of the core tube (3) are all provided with double-ear clamps (6), and connecting rods (7) are connected between the double-ear clamps (6) at the upper side of the drill rod (1) and the connecting joint (2) and between the double-ear clamps (6) at the lower side of the core tube (3) and the connecting joint (2).

2. The anti-drill-drop coring device for drilling in the goaf caving zone according to claim 1, characterized in that: The drill rod (1), connecting joint (2) and core tube (3) are all provided with annular grooves on their corresponding peripheral surfaces to the double-ear clamp (6), and the double-ear clamp (6) is movably engaged in the annular groove.

3. The anti-drill-drop coring device for drilling in the goaf caving zone according to claim 1, characterized in that: The double-ear clamp (6) includes two symmetrically arranged arc-shaped clamps, both ends of which are provided with through holes (61). The two ends of the connecting rod (7) are provided with insertion holes (71) corresponding to the through holes (61). A bolt is inserted through the insertion hole (71) in the through hole (61), and the double-ear clamp (6) and the connecting rod (7) are connected by bolts and nuts.

4. The anti-drill-drop coring device for drilling in the goaf caving zone according to claim 1, characterized in that: The drill rod (1) and the connecting joint (2), as well as the connecting joint (2) and the core barrel (3), are all connected by sawtooth threads.

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