Air down-the-hole hammer drilling tool for covering layer drilling

Abstract

The utility model relates to the technical field of air down-the-hole hammer drilling tools, and discloses an air down-the-hole hammer drilling tool for covering layer drilling, which comprises an upper joint, a casing string and a casing drill bit, an outer pipe is sleeved outside the middle part of the upper joint, an inner pipe nipple is sleeved at the lower end of the inner part of the outer pipe, and a core barrel is sleeved outside the lower end of the upper joint. When the drilling tool is used, the upper connector is connected with the down-the-hole hammer, so that the drilling tool can directly descend to the bottom of a hole and automatically align to the casing shoe assembly so as to carry out coring drilling of the down-the-hole hammer, and in the drilling process, along with descending of a drill rod, the impactor drives the center drilling tool to rotate, so that coring drilling is carried out on the down-the-hole hammer. Meanwhile, the sleeve shoe assembly is driven to synchronously extend along with the sleeve shoe assembly, the sleeve shoe assembly and the coring drill bit are simultaneously operated along with the sleeve, the efficiency of drilling operation is greatly improved, in addition, automatic alignment and synchronous operation are favorable for reducing the possibility of manual operation errors, and the safety of the drilling operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air down-the-hole hammer drilling tools, in particular to an air down-the-hole hammer drilling tool for drilling holes in an overburden layer. Background Art

[0002] Air down-the-hole hammer drilling tool for overburden drilling is a device used to drill holes in underground overburden. This drilling tool uses compressed air as a power source and transmits energy to the drill bit through the working principle of the down-the-hole hammer, thereby achieving penetration and drilling operations in the underground overburden.

[0003] The air down-the-hole hammer drill for overburden drilling is highly efficient and fast in the process of drilling holes in the underground overburden, and is suitable for different types of geological conditions. It can be used in underground pipeline laying, geological exploration, mining and other fields, and is a commonly used underground engineering drilling equipment.

[0004] At present, most of the air down-the-hole hammer drills used for drilling holes in overburden layers require separate coring and drilling during the operation process. This separate operation increases the steps and time of the operation, resulting in longer time required to complete a drilling and reduced overall efficiency. In addition, the separate operation also requires more manpower, equipment and operating steps, which increases the complexity and difficulty of the operation, may cause errors, and reduce the reliability of the operation.

[0005] Therefore, those skilled in the art provide an air down-the-hole hammer drill for drilling overburden to solve the problems raised in the above background technology. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose an air down-the-hole hammer drill for drilling overburden holes. When the drill is in use, the drill is connected to the down-the-hole hammer through an upper joint, so that the drill can go directly to the bottom of the hole and automatically align with the casing shoe assembly to perform down-the-hole hammer coring drilling. During the drilling process, as the drill rod descends, the impactor drives the center drill to rotate, and at the same time drives the casing shoe assembly to extend synchronously, following the casing and the coring drill bit at the same time, greatly improving the efficiency of the drilling operation. In addition, automatic alignment and synchronization help reduce the possibility of human operating errors and improve the safety of the drilling operation.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An air down-the-hole hammer drill for drilling overburden, comprising an upper joint, a casing string and a casing drill bit, wherein an outer tube is sleeved on the middle outer portion of the upper joint, an inner tube nipple is sleeved on the inner lower end of the outer tube, a core tube is sleeved on the outer lower end of the upper joint, a coring drill bit is sleeved on the outer lower end of the core tube, a casing shoe is sleeved on the inner lower end of the casing string, a groove is provided on the outer lower end of the casing shoe, and a protrusion is fixedly connected to the inner upper end of the casing drill bit;

[0009] Through the above technical solution, when the drill tool is in use, it is connected to the down-the-hole hammer through the set upper joint, so that the drill tool can go directly to the bottom of the hole and automatically align with the casing shoe assembly to perform down-the-hole hammer coring drilling. During the drilling process, as the drill rod descends, the impactor drives the center drill tool to rotate, and at the same time drives the casing shoe assembly to extend synchronously, following the casing and the coring drill bit at the same time, which greatly improves the efficiency of the drilling operation. In addition, automatic alignment and synchronization help reduce the possibility of human operating errors and improve the safety of the drilling operation.

[0010] Further, a first O-shaped rubber ring is provided at the outer lower end of the core tube;

[0011] Through the above technical solution, the first O-shaped rubber ring can provide good sealing performance, prevent the leakage of the medium between the core tube and the coring drill bit, and ensure the accuracy and reliability of core collection.

[0012] Furthermore, a second O-shaped rubber ring is provided at the inner upper end of the core tube;

[0013] Through the above technical solution, the second O-ring can provide better sealing performance, prevent leakage of the medium between the inside of the core tube and the upper joint, and ensure the accuracy and reliability of core collection.

[0014] Furthermore, the groove and the protrusion are snap-fitted and connected;

[0015] Through the above technical solution, the snap-fit ​​design of the groove and the protrusion can ensure that the connecting component remains stable during use and prevent loosening or falling off due to vibration or other external forces.

[0016] Furthermore, a first vent hole is provided in the middle of the upper joint;

[0017] Through the above technical solution, by providing the first vent hole, air can effectively enter the system, thereby ensuring the normal operation and operation of the system.

[0018] Furthermore, a second vent hole is provided on one side of the inner lower end of the upper joint;

[0019] Through the above technical solution, the second vent hole can be used to remove the gas or pressure inside the joint, ensuring normal ventilation during the drilling process and avoiding pressure accumulation that may cause equipment damage or inconvenience in operation.

[0020] Furthermore, the casing string is sleeved on the outside of the upper joint and has a certain gap;

[0021] Through the above technical solution, under the conditions of complex geological conditions or squeezing pressure in the well, the gap can make the casing string and the joint more easily adapt to deformation, ensuring the smooth progress of drilling.

[0022] The utility model has the following beneficial effects:

[0023] 1. The utility model proposes an air down-the-hole hammer drill for drilling overburden. Compared with the existing air down-the-hole hammer drill, the air down-the-hole hammer drill is connected to the down-the-hole hammer through an upper joint when it is used, so that the drill can directly go down to the bottom of the hole and automatically align with the casing shoe assembly to perform down-the-hole hammer coring drilling. During the drilling process, as the drill rod descends, the impactor drives the center drill to rotate, and at the same time drives the casing shoe assembly to extend synchronously, following the casing and the coring drill bit at the same time, which greatly improves the efficiency of the drilling operation. In addition, automatic alignment and synchronization help reduce the possibility of human operating errors and improve the safety of the drilling operation.

[0024] 2. The utility model proposes an air down-the-hole hammer drill for drilling overburden. Compared with the existing air down-the-hole hammer drill, the air down-the-hole hammer drill can directly use air as a flushing and cooling medium when it is used, thereby improving the drilling efficiency and the coring quality, while avoiding the use of liquid medium, simplifying the drilling process, saving costs and resources, and because no liquid medium is involved, the impact on surface vegetation is small, making it easy to recover after drilling is completed, which has certain green and environmental protection significance, helps to protect the environment, save resources, and conforms to the concept of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is an axonometric diagram of an air down-the-hole hammer drill for drilling holes in overburden layers proposed by the utility model;

[0026] Figure 2 This is a cross-sectional view of an air down-the-hole hammer drill for drilling holes in overburden layers proposed by the utility model;

[0027] Figure 3 This is an axonometric view of the upper joint of an air down-the-hole hammer drill for drilling overburden holes proposed by the utility model;

[0028] Figure 4 This is a schematic diagram of the connection between the casing drill bit and the casing shoe of an air down-the-hole hammer drill for drilling holes in overburden layers proposed by the utility model;

[0029] Figure 5 The utility model provides an air down-the-hole hammer drill for drilling holes in the overburden layer. Figure 2 Enlarged view of point A in the middle.

[0030] Legend:

[0031] 1. Casing string; 2. Upper joint; 3. First vent hole; 4. Second vent hole; 5. Outer tube; 6. Core tube; 7. Inner tube short section; 8. Casing shoe; 9. Casing drill bit; 10. Groove; 11. Bump; 12. Coring drill bit; 13. First O-ring; 14. Second O-ring. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the specific implementation of the utility model to clearly and completely describe the technical solutions in the specific implementation of the utility model. Obviously, the specific implementation described is only a part of the specific implementation of the utility model, not all of the specific implementation. Based on the specific implementation of the utility model, all other specific implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Reference Figure 1-5 The utility model provides a specific embodiment: an air down-the-hole hammer drill for drilling overburden, comprising an upper joint 2, a casing string 1 and a casing drill bit 9, an outer tube 5 is sleeved on the middle outer part of the upper joint 2, an inner tube short section 7 is sleeved on the inner lower end of the outer tube 5, a core tube 6 is sleeved on the outer lower end of the upper joint 2, a core drill bit 12 is sleeved on the outer lower end of the core tube 6, a casing shoe 8 is sleeved on the inner lower end of the casing string 1, a groove 10 is provided on the outer lower end of the casing shoe 8, a bump 11 is fixedly connected to the inner upper end of the casing drill bit 9, and the casing shoe 8 is provided with a groove 10. When the drilling tool is in use, it is connected to the down-the-hole hammer through the upper joint 2, so that the drilling tool can go directly to the bottom of the hole and automatically align with the casing shoe 8 assembly to perform down-the-hole hammer coring drilling. During the drilling process, as the drill rod descends, the impactor drives the center drill tool to rotate, and at the same time drives the casing shoe 8 assembly to extend synchronously, following the casing and the coring drill bit 12 at the same time, which greatly improves the efficiency of the drilling operation. In addition, automatic alignment and synchronization help reduce the possibility of human operating errors and improve the safety of the drilling operation.

[0034] The outer lower end of the core tube 6 is provided with a first O-shaped rubber ring 13, and the first O-shaped rubber ring 13 can provide good sealing performance to prevent the leakage of the medium between the core tube 6 and the coring drill bit 12, thereby ensuring the accuracy and reliability of core collection. The inner upper end of the core tube 6 is provided with a second O-shaped rubber ring 14, and the second O-shaped rubber ring 14 can provide better sealing performance to prevent the leakage of the medium between the inside of the core tube 6 and the upper joint 2, thereby ensuring the accuracy and reliability of core collection. The groove 10 and the protrusion 11 are connected by snapping, and the snapping design of the groove 10 and the protrusion 11 can ensure that the connection parts remain stable during use, and prevent the connection parts from being damaged due to vibration or other external forces. In order to prevent the loosening or falling off caused by the upper joint 2, a first vent hole 3 is opened in the middle part of the interior of the upper joint 2. By setting the first vent hole 3, air can effectively enter the system, thereby ensuring the normal operation and operation of the system. A second vent hole 4 is opened on one side of the lower end of the upper joint 2. The second vent hole 4 can be used to remove the gas or pressure inside the joint to ensure normal ventilation during drilling and avoid pressure accumulation that causes equipment damage or inconvenience in operation. The casing string 1 is sleeved on the outside of the upper joint 2 and has a certain gap. When the geological conditions are complex or there is extrusion pressure underground, the gap can make the casing string 1 and the joint more easily adapt to deformation and ensure the smooth progress of drilling.

[0035] Working principle: When the drill tool is in use, it is directly connected to the down-the-hole hammer through the upper joint 2 to form a lifting part that can be raised and lowered along with the drill pipe. It can directly go down to the bottom of the hole and automatically find its position with the casing shoe 8 assembly to carry out down-the-hole hammer coring drilling. At the end of the round, the drill pipe is lifted to the ground, and after the core is unloaded, it is lowered to the bottom of the hole for drilling. While drilling, the drill pipe drives the center drill tool to rotate through the impactor and drives the casing shoe 8 assembly to extend downward synchronously along with the drilling, and follows the casing and the coring drill bit 12 synchronously, thereby realizing down-the-hole hammer coring and pipe drilling, and improving the efficiency of the drilling operation.

[0036] Finally, it should be noted that the above is only a preferred specific implementation method of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned specific implementation methods, those skilled in the art can still modify the technical solutions recorded in the aforementioned specific implementation methods, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air down-the-hole hammer drill for drilling overburden, comprising an upper joint, a casing string and a casing drill bit, characterized in that: An outer tube is sleeved on the middle outer part of the upper joint, an inner tube short section is sleeved on the inner lower end of the outer tube, a core tube is sleeved on the outer lower end of the upper joint, a coring drill bit is sleeved on the outer lower end of the core tube, a casing shoe is sleeved on the inner lower end of the casing string, a groove is formed on the outer lower end of the casing shoe, and a bump is fixedly connected to the inner upper end of the casing drill bit.

2. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: A first O-shaped rubber ring is arranged at the outer lower end of the core tube.

3. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: A second O-shaped rubber ring is arranged at the inner upper end of the core tube.

4. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: The groove and the protrusion are snap-fitted and connected.

5. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: A first vent hole is provided in the middle of the interior of the upper joint.

6. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: A second vent hole is provided on one side of the inner lower end of the upper joint.

7. The air down-the-hole hammer drill for overburden drilling according to claim 1, characterized in that: The casing string is sleeved on the outside of the upper joint and has a gap.

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