Coal rock drilling deep hole jet nozzle with support and guide functions

Abstract

The application discloses a coal and rock drilling deep hole jet nozzle with supporting and guiding functions, which comprises a nozzle, a drill rod, a sleeve and a telescopic expansion type guiding and supporting mechanism, the sleeve is coaxially arranged at the front part of the outer circle of the drill rod, an annular cavity is arranged between the inner circle of the sleeve and the outer circle of the drill rod, the nozzle is coaxially arranged at the front end of the drill rod, the nozzle is arranged in the sleeve, the telescopic expansion type guiding and supporting mechanism is coaxially arranged on the drill rod, the front side of the telescopic expansion type guiding and supporting mechanism is fixedly connected with the rear end of the sleeve, and the rear end of the telescopic expansion type guiding and supporting mechanism is fixedly connected with the outer circle of the drill rod. The application has the advantages of scientific principle, simple structure, easy processing and low cost. The application can not only ensure the distance of the jet core section between the nozzle and the sleeve when water jet is used to break coal and rock, but also can support the drill rod and the hole wall.

Description

Technical Field

[0001] This invention belongs to the field of mining drilling tools technology, and in particular relates to a deep hole jet nozzle for coal and rock drilling with a supporting and guiding function. Background Technology

[0002] With the rapid development of industry, people's demand for resources is gradually increasing, especially for combustible energy sources such as coal or oil. High-pressure jet technology is a widely used technology in industry, fire protection, and other fields. The basic principle of high-pressure water jet is to pressurize ordinary tap water to a very high pressure through devices such as booster pumps and pressure regulators, and then use nozzles to make the water flow reach extremely high speed and pressure, thereby processing objects. In the coal mining industry, high-pressure water jet has been widely used in coal and rock fracturing and coal and rock drilling. Compared with mechanical drilling and hydraulic breaking drilling, it has advantages such as good pressure relief and penetration enhancement effects and improvement of internal coal seam pressure. Moreover, water jet drilling has advantages such as being environmentally friendly, pollution-free, convenient to use, and economical. Underground coal and rock drilling in coal mines mainly uses hydraulic impact drilling, mechanical drilling, and water jet drilling. Due to the many limitations of hydraulic impact drilling and mechanical drilling methods, which require more energy and equipment, high-pressure water jet drilling has become an important method for deep hole drilling in coal and rock underground. However, existing water jet nozzles are relatively complex, have low coal and rock crushing efficiency, and poor borehole guidance, which limits their large-scale use in coal mines. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a deep-hole jet nozzle for coal and rock drilling with supporting and guiding functions. This invention can achieve very high jet impact force, capable of breaking up hard coal and rock, while precisely controlling the borehole diameter to avoid impact on the surrounding environment. It not only consumes less energy and is safer during coal and rock drilling, but also provides a certain degree of support and guidance.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a deep hole jet nozzle for coal and rock drilling with supporting and guiding function, comprising a nozzle, a drill rod, a casing, and a telescopic expansion guide support mechanism. The casing is coaxially sleeved on the front part of the outer circle of the drill rod, and there is an annular cavity between the inner circle of the casing and the outer circle of the drill rod. The nozzle is coaxially installed on the front end of the drill rod and is located inside the casing. The telescopic expansion guide support mechanism is coaxially installed on the drill rod, and the front side of the telescopic expansion guide support mechanism is fixedly connected to the rear end of the casing, and the rear end of the telescopic expansion guide support mechanism is fixedly connected to the outer circle of the drill rod.

[0005] The telescopic expansion guide support mechanism includes a front support limiting ring, a rear support limiting ring, a spring, a retaining ring, a guide wheel assembly, and several elastic support rods. The front support limiting ring, spring, rear support limiting ring, guide wheel assembly, and retaining ring are sequentially sleeved on the drill pipe from front to top to back. Several elastic support rods are evenly arranged along the circumference of the drill pipe. The front and rear ends of the elastic support rods are fixedly connected to the front and rear support limiting rings, respectively. The front and rear ends of the spring are pressed against the front and rear support limiting rings, respectively. The front end of the front support limiting ring is fixedly connected to the rear end of the casing. The guide wheel assembly is fixedly connected to the drill pipe. The retaining ring covers the guide wheel assembly, and the front end of the retaining ring is fixedly connected to the rear support limiting ring.

[0006] The guide wheel assembly includes a collar fitted around the outer circumference of the drill pipe. Several axles are evenly distributed on the outer circumference of the collar. The center line of each axle is set along the radial direction of the collar. A roller rotates on each axle. The diameter of the roller is larger than the width of the collar in the front-to-back direction.

[0007] The inner circle of the casing is fixedly equipped with an annular support guide plate that is sleeved on the outer circle of the drill pipe.

[0008] The nozzle is a cylindrical structure with an open rear end. The inner circle of the nozzle's rear port is threaded to the outer circle of the drill rod's front end. Several jet nozzle holes are evenly distributed on the nozzle's front end plate.

[0009] Several drainage holes are evenly distributed along the circumference on the front side of the sleeve.

[0010] By adopting the above technical solution, the present invention has the following technical effects:

[0011] 1) High-pressure water flows through the hollow drill rod and is sprayed forward through the jet nozzle at the front end of the nozzle. The high-pressure water jet breaks the rock into small pieces, and the water and rock fragments can be discharged through the drain hole.

[0012] 2) The drill rod passes through the annular support guide plate, which provides support and positioning for the drill rod during operation.

[0013] 3) The two ends of the spring are fixedly connected between the front support limiting ring and the rear support limiting ring. The front support limiting ring and the rear support limiting ring control the spring compression and limit the spring. The elastic support rod limits the maximum length of the spring. When the spring is compressed, the distance between the front support limiting ring and the rear support limiting ring decreases, the elastic support rod bends outward and opens up, and multiple elastic support rods press against the hole wall of the drill hole, which plays a positioning and support role for the entire nozzle.

[0014] 4) The multiple rollers of the guide wheel assembly press against the rear support limiting ring. When the drill rod rotates in the inner holes of the front and rear support limiting rings, it drives the shaft collar and rollers to rotate together, which can reduce friction.

[0015] 5) The retaining ring is connected to the rear support limiting ring. The guide wheel assembly is inside. During operation, it can apply pressure to the support limiting ring and stop operation. When the drill rod is pulled out, the guide wheel assembly can apply pressure to the retaining ring, so that the spring and elastic support rod can return to their original state.

[0016] 6) During operation, the drill rod advances forward, and the front end of the casing presses against the rock and remains stationary. The guide wheel assembly fixed on the drill rod applies pressure to the rear support limiting ring. On the one hand, after the spring is compressed, the elastic support rod is bent and deformed under pressure, expanding radially along the drill rod to support the borehole wall. On the other hand, when the left and right support limiting rings come into contact, the spring is compressed to the limited position, and the distance between the front end of the nozzle and the right end of the casing is just the distance of the jet core section. The high-pressure jet water sprayed from the nozzle cuts the coal and rock, and the cut rock fragments are discharged through the drainage hole opened in the casing along with the water flow.

[0017] In summary, the device of this invention is scientifically sound, simple in structure, easy to manufacture, and low in cost. When performing water jet coal and rock breaking, this invention can not only ensure the distance between the nozzle and the core section of the jet, but also provide a certain degree of support for the drill rod and the borehole wall. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention in its non-operating state;

[0019] Figure 2 This is an axial cross-sectional view of the present invention in its non-operating state;

[0020] Figure 3 This is a three-dimensional structural diagram of the overall shape of the present invention in its working state;

[0021] Figure 4 A cross-sectional schematic diagram of the overall structure of the present invention, which supports the operation within the hole.

[0022] Figure 5 This is a three-dimensional structural diagram of the guide wheel assembly in this invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1-5As shown, a deep-hole jet nozzle for coal and rock drilling with a supporting and guiding function according to the present invention includes a nozzle 1, a drill rod 2, a casing 3, and a telescopic expansion guide support mechanism. The casing 3 is coaxially sleeved on the front part of the outer circle of the drill rod 2. An annular cavity 4 is formed between the inner circle of the casing 3 and the outer circle of the drill rod 2. The nozzle 1 is coaxially installed on the front end of the drill rod 2 and is located inside the casing 3. The telescopic expansion guide support mechanism is coaxially installed on the drill rod 2. The front side of the telescopic expansion guide support mechanism is fixedly connected to the rear end of the casing 3, and the rear end of the telescopic expansion guide support mechanism is fixedly connected to the outer circle of the drill rod 2.

[0025] The telescopic expansion guide support mechanism includes a front support limiting ring 5, a rear support limiting ring 6, a spring 7, a retaining ring 8, a guide wheel assembly 9, and several elastic support rods 10. The front support limiting ring 5, spring 7, rear support limiting ring 6, guide wheel assembly 9, and retaining ring 8 are sequentially sleeved on the drill pipe 2 from front to top to back. The several elastic support rods 10 are evenly arranged along the circumference of the drill pipe 2. The front end and rear end of the elastic support rods 10 are fixedly connected to the front support limiting ring 5 and the rear support limiting ring 6, respectively. The front and rear ends of the spring 7 are pressed against the front support limiting ring 5 and the rear support limiting ring 6, respectively. The front end of the front support limiting ring 5 is fixedly connected to the rear end of the casing 3. The guide wheel assembly 9 is fixedly connected to the drill pipe 2. The retaining ring 8 covers the guide wheel assembly 9, and the front end of the retaining ring 8 is fixedly connected to the rear support limiting ring 6.

[0026] The guide wheel assembly 9 includes a collar 11 fitted around the outer circle of the drill rod 2. A plurality of wheel shafts 12 are evenly arranged on the outer circle of the collar 11. The center line of each wheel shaft 12 is arranged along the radial direction of the collar 11. A roller 13 is rotatably mounted on each wheel shaft 12. The diameter of the roller 13 is larger than the width of the collar 11 in the front-back direction.

[0027] The inner circle of the casing 3 is fixedly provided with an annular support guide plate 14 that is sleeved on the outer circle of the drill rod 2.

[0028] Nozzle 1 is a cylindrical structure with an open rear end. The inner circle of the rear end of nozzle 1 is threaded to the outer circle of the front end of drill rod 2. Several jet nozzle holes 15 are evenly opened on the front end plate of nozzle 1.

[0029] Several drainage holes 16 are evenly provided on the front side of the sleeve 3 along the circumferential direction.

[0030] When the invention is in operation, the drill rod 2 advances forward, and the front end of the casing 3 presses against the rock and remains stationary. The guide wheel assembly 9 fixed on the drill rod 2 applies pressure to the rear support limiting ring 6. On the one hand, after the spring 7 is compressed, the elastic support rod 10 is bent and deformed under pressure, and expands radially along the drill rod 2, which plays the role of supporting the hole wall. On the other hand, when the left support limiting ring and the right support limiting ring come into contact, the spring 7 is compressed to the limited position, and the distance between the front end of the nozzle 1 and the right end of the casing 3 is just the distance of the jet core section. The high-pressure jet water sprayed from the nozzle 1 cuts the coal and rock, and the cut rock fragments are discharged through the drain hole 16 opened in the casing 3 along with the water flow.

[0031] The above description is only a preferred embodiment of the present invention. The directions such as front, back, left, and right are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep-hole jet nozzle for coal and rock drilling with supporting and guiding functions, characterized in that: It includes a nozzle, drill pipe, casing, and telescopic expansion guide support mechanism. The casing is coaxially sleeved on the front part of the outer circle of the drill pipe. There is an annular cavity between the inner circle of the casing and the outer circle of the drill pipe. The nozzle is coaxially installed on the front end of the drill pipe and is located inside the casing. The telescopic expansion guide support mechanism is coaxially installed on the drill pipe. The front side of the telescopic expansion guide support mechanism is fixedly connected to the rear end of the casing, and the rear end of the telescopic expansion guide support mechanism is fixedly connected to the outer circle of the drill pipe. The telescopic expansion guide support mechanism includes a front support limiting ring, a rear support limiting ring, a spring, a retaining ring, a guide wheel assembly, and several elastic support rods. The front support limiting ring, spring, rear support limiting ring, guide wheel assembly, and retaining ring are sequentially sleeved on the drill pipe from front to top to back. Several elastic support rods are evenly arranged along the circumference of the drill pipe. The front and rear ends of the elastic support rods are fixedly connected to the front and rear support limiting rings, respectively. The front and rear ends of the spring are pressed against the front and rear support limiting rings, respectively. The front end of the front support limiting ring is fixedly connected to the rear end of the casing. The guide wheel assembly is fixedly connected to the drill pipe. The retaining ring covers the guide wheel assembly, and the front end of the retaining ring is fixedly connected to the rear support limiting ring.

2. The deep-hole jet nozzle for coal and rock drilling with supporting and guiding function according to claim 1, characterized in that: The guide wheel assembly includes a collar fitted around the outer circumference of the drill pipe. Several axles are evenly distributed on the outer circumference of the collar. The center line of each axle is set along the radial direction of the collar. A roller rotates on each axle. The diameter of the roller is larger than the width of the collar in the front-to-back direction.

3. A deep-hole jet nozzle for coal and rock drilling with supporting and guiding function according to claim 1 or 2, characterized in that: The inner circle of the casing is fixedly equipped with an annular support guide plate that is sleeved on the outer circle of the drill pipe.

4. A deep-hole jet nozzle for coal and rock drilling with supporting and guiding function according to claim 1 or 2, characterized in that: The nozzle is a cylindrical structure with an open rear end. The inner circle of the nozzle's rear port is threaded to the outer circle of the drill rod's front end. Several jet nozzle holes are evenly distributed on the nozzle's front end plate.

5. A deep-hole jet nozzle for coal and rock drilling with supporting and guiding function according to claim 4, characterized in that: Several drainage holes are evenly distributed along the circumference on the front side of the sleeve.

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