Annular joint cutting device for blast hole in open-pit mining

Abstract

The utility model relates to an open-pit mining blast hole annular joint cutting device which comprises a body, external threads are arranged on the peripheral wall of the upper end of the body, at least one hydraulic supporting mechanism and at least one hydraulic rotary cutting mechanism are arranged on the peripheral wall of the lower end of the body at intervals, and the hydraulic supporting mechanisms are rotationally connected with the peripheral wall of the body. The hydraulic supporting mechanism is used for supporting and fixing the whole device in a blast hole, and the hydraulic rotary cutting mechanism is used for cutting an annular kerf of the blast hole; the hydraulic supporting mechanism and the hydraulic rotary cutting mechanism can be adjusted in the radial direction under pushing of the hydraulic system. Through the synergistic effect of the hydraulic supporting mechanism and the rotary cutting mechanism, under the cooperation of a hydraulic system and the rotating power of a drilling machine, annular joint cutting operation of the inner wall of a blast hole can be efficiently and stably completed; and the hydraulic telescopic mechanism is flexible in design, the cutting diameter can be flexibly adjusted according to the rock stratum hardness and the blast hole size, different rock stratum conditions can be better adapted, and the joint cutting precision and the blasting effect uniformity are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of blast hole cutting equipment technology, specifically to a circumferential cutting device for blast holes in open-pit mining. Background Technology

[0002] In open-pit mining, blasting operations are a critical step affecting mining efficiency and quality. Traditional longitudinal blasting methods typically involve drilling cylindrical holes vertically or at an angle into the rock mass. The blasting energy is mainly released along the axis of the blast hole. Due to the heterogeneity and fissures of the rock mass, the resulting rock mass often exhibits uneven block size and poor blast pile shape, which in turn affects the efficiency of subsequent loading and transportation.

[0003] To improve blasting efficiency and precision, researchers proposed annular slit cutting, which involves making annular slits inside the borehole along a direction perpendicular to the borehole axis, creating an annular slit around the inner wall of the borehole. This annular slit allows blasting energy to diffuse evenly along the slit, facilitating more precise blasting control and resulting in more uniform rock mass size and a more regular blast pile shape.

[0004] However, existing circumferential slitting devices mostly use slitting cutters with fixed diameters, making it difficult to adapt to the slitting requirements of rock strata with varying hardness and structure. This results in poor adaptability, low slitting efficiency, and unsatisfactory blasting effects. Therefore, there is an urgent need to develop a new type of circumferential slitting device that uses adjustable-diameter slitting cutters. This device can flexibly adjust the slitting diameter according to the hardness and structure of the rock strata, thereby overcoming the bottlenecks of existing technologies and providing an efficient, precise, and highly adaptable solution for open-pit mining blasting operations. Utility Model Content

[0005] This utility model provides a device for circumferential slitting of blast holes in open-pit mining.

[0006] The specific technical solution of this utility model is as follows:

[0007] A device for circumferential slit cutting of blast holes in open-pit mining includes a main body. The upper outer peripheral wall of the main body has external threads, and the lower outer peripheral wall of the main body is provided with at least one set of hydraulic support mechanisms and at least one set of hydraulic rotary cutting mechanisms at intervals. The hydraulic support mechanisms are rotatably connected to the outer peripheral wall of the main body. The hydraulic support mechanisms are used to support and fix the entire device inside the blast hole, and the hydraulic rotary cutting mechanisms are used to cut circumferential slits in the blast hole. The hydraulic support mechanisms and the hydraulic rotary cutting mechanisms can be radially adjusted under the drive of a hydraulic system.

[0008] Furthermore, preferably, the hydraulic support mechanism is provided in two sets, and the hydraulic rotary cutting mechanism is provided in one set.

[0009] Furthermore, preferably, the hydraulic rotary cutting mechanism is disposed between the two sets of hydraulic support mechanisms.

[0010] Furthermore, preferably, the hydraulic support mechanism is rotatably connected to the outer peripheral wall of the main body via a hydraulic slip ring.

[0011] Furthermore, preferably, the hydraulic support mechanism includes multiple sets of supports arranged in a ring array on the outer peripheral wall of the hydraulic slip ring, with a telescopic leg slidably connected to the other end of each support, and a support plate connected to the end of each telescopic leg.

[0012] Furthermore, preferably, the hydraulic rotary cutting mechanism includes multiple sets of bases arranged in a ring array on the outer peripheral wall of the main body, with a telescopic rod slidably connected to the other end of the base, and a drill bit connected to the end of the telescopic rod, with multiple cutting teeth evenly distributed on the outer surface of the drill bit.

[0013] Furthermore, preferably, the hydraulic support mechanism includes four sets of supports arranged in a circular array, along with their corresponding telescopic outriggers and support plates.

[0014] Furthermore, preferably, the hydraulic rotary cutting mechanism includes four sets of bases arranged in a ring array and their matching telescopic rods, drill bits, and cutting teeth.

[0015] Furthermore, preferably, the main body has an oil pipe channel in the axial direction and an oil pipe ring in the radial direction; the oil pipe channel extends from the top of the main body to the lowest hydraulic support mechanism, and one side of the oil pipe channel is connected to two hydraulic slip rings and the oil pipe ring from top to bottom; the oil pipe ring is located near the hydraulic rotary cutting mechanism, and a through hole is also provided on the outer peripheral wall of the oil pipe ring for the oil pipe to pass through and connect to the hydraulic rotary cutting mechanism.

[0016] Furthermore, preferably, the support plate is a circular rubber plate.

[0017] The beneficial effects of this utility model are as follows: Through the synergistic action of the hydraulic support mechanism and the rotary cutting mechanism, and with the cooperation of the hydraulic system and the rotational power of the drilling rig, this utility model can efficiently and stably complete the circumferential cutting operation on the inner wall of the blast hole. The hydraulic support mechanism can firmly fix the device inside the blast hole, providing a stable foundation for cutting; while the rotary cutting mechanism can precisely adjust the cutting depth to meet the requirements of different mining processes. The device's hydraulic telescopic mechanism is flexibly designed, allowing for flexible adjustment of the cutting diameter according to the rock hardness and blast hole size. Compared with traditional fixed-diameter cutting tools, it is more adaptable to different rock conditions, significantly improving cutting accuracy and the uniformity of blasting effects, thereby optimizing the overall efficiency of open-pit mining. Furthermore, in conjunction with the drilling rig control system, it can achieve intelligent cutting control, real-time adjustment of cutting parameters, optimization of cutting efficiency, and extension of equipment lifespan. Overall, this device has a compact structure, is easy to operate, highly adaptable, and highly intelligent, possessing significant economic and social benefits and can be widely applied in various open-pit mining scenarios. Attached Figure Description

[0018] Figure 1 This is a front view of a circumferential slit cutting device for open-pit blast holes according to the present invention;

[0019] Figure 2 This is a cross-sectional view of the hydraulic support mechanism;

[0020] Figure 3 This is a cross-sectional view of the hydraulic rotary cutting mechanism;

[0021] Figure 4 This is a structural diagram of the oil pipe channel and oil pipe loop.

[0022] Figure 5 This is a cross-sectional view showing the connection between the oil pipe and the hydraulic support mechanism;

[0023] Figure 6 This is a cross-sectional view showing the connection between the oil pipe and the hydraulic rotary cutting mechanism.

[0024] In the diagram: 1-body, 101-oil pipe channel, 102-oil pipe loop; 2-hydraulic support mechanism, 201-support, 202-telescopic outrigger, 203-support plate; 3-hydraulic rotary cutting mechanism, 301-base, 302-telescopic rod, 303-drill bit, 304-cutting teeth; 4-hydraulic slip ring; 5-oil inlet pipe; 6-oil outlet pipe. Detailed Implementation

[0025] To make the technical problems and solutions solved by this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1 As shown, an open-pit blast hole circumferential cutting device includes a body 1, a hydraulic support mechanism 2, and a rotary cutting mechanism 3. The upper outer peripheral wall of the body 1 has external threads for easy connection to the drill rod of the drilling rig, enabling rapid installation and fixation of the device. Two sets of hydraulic support mechanisms 2 and one set of hydraulic rotary cutting mechanisms 3 are spaced apart on the lower outer peripheral wall of the body 1, with the hydraulic rotary cutting mechanism 3 positioned between the two sets of hydraulic support mechanisms 2. Both sets of hydraulic support mechanisms 2 are rotatably connected to the outer peripheral wall of the body 1 via hydraulic slip rings 4.

[0029] Two sets of hydraulic support mechanisms 2, driven by the hydraulic system, press against the inner wall of the blast hole, which can support and fix the entire device inside the blast hole; the hydraulic rotary cutting mechanism 3, driven by the hydraulic system and the rotation of the body 1 driven by the drill rod, performs circumferential cutting on the inner wall of the blast hole, and continuously cuts out circumferential slits of appropriate depth.

[0030] like Figure 2 As shown, the hydraulic support mechanism 2 includes four sets of supports 201 arranged in a ring array on the outer peripheral wall of the hydraulic slip ring 4. A telescopic outrigger 202 is slidably connected to the other end of each support 201, and a support plate 203 is connected to the end of each telescopic outrigger 202. The support plate 203 is a circular rubber plate with good flexibility and sealing properties. When the hydraulic system pushes the telescopic outrigger 202 to extend, it can tightly fit against the inner wall of the borehole, providing stable support for the device and ensuring stability during the cutting process.

[0031] like Figure 3As shown, the hydraulic rotary cutting mechanism 3 includes four sets of bases 301 arranged in a ring array on the outer peripheral wall of the main body 1. A telescopic rod 302 is slidably connected to the other end of each base 301. A drill bit 303 is connected to the end of the telescopic rod 302. The drill bit 303 has a fan-shaped structure with multiple cutting teeth 304 evenly distributed on its outer surface. During rotary cutting, these cutting teeth 304 can efficiently cut the inner wall of the borehole in a circumferential direction. Furthermore, by controlling the extension and retraction of the telescopic rod 302, the depth of the circumferential cut can be precisely adjusted to meet the requirements of different mining processes.

[0032] like Figure 4 As shown, the main body 1 has an oil pipe channel 101 in the axial direction and an oil pipe annular channel 102 in the radial direction. The oil pipe channel 101 extends from the top of the main body 1 to the lowest hydraulic support mechanism 2, and one side of the oil pipe channel 101 is connected to the two hydraulic slip rings 4 and the oil pipe annular channel 102 from top to bottom. The oil pipe annular channel 102 is located near the hydraulic rotary cutting mechanism 3, and a through hole for the oil supply pipe is also provided on the outer peripheral wall of the oil pipe annular channel 102. The oil supply pipe passes through and connects to the hydraulic rotary cutting mechanism 3, thereby establishing an oil passage between the hydraulic system (which can be the one already on the drilling rig) and each actuator.

[0033] like Figure 5 Figure 6 As shown, when the hydraulic system on the drilling rig is connected to the device, the inlet pipe 5 and outlet pipe 6 pass through the top of the pipe channel 101 and are then connected to the hydraulic slip ring 4. Multiple channels on the hydraulic slip ring 4 supply oil to the support 201, pushing the telescopic outrigger 202 to extend until the support plate 203 is firmly attached to the inner wall of the borehole, completing the support and fixation of the device. Simultaneously, the pipe can also pass through the pipe annular channel 102 and branch connectors are installed at multiple through holes to supply oil to the base 301, pushing the telescopic rod 302 to extend, causing the cutting teeth 304 to contact the inner wall of the borehole. During the rotation of the drill rod driving the body 1, the cutting teeth 304 continuously extend under the continuous push of the hydraulic system, achieving circumferential cutting of the inner wall of the borehole and gradually penetrating to form a circumferential cut of suitable depth. The two sets of hydraulic support mechanisms 2 can use the same set of pipes for easy hydraulic linkage to complete the support; the hydraulic rotary cutting mechanism 3 uses a different set of pipes.

[0034] It should be noted that the dimensions (height, diameter) of the main body 1 can be designed according to the actual borehole size, drilling rig model, and other specific circumstances to achieve optimal matching with existing mining equipment. The number and specific positions of the hydraulic support mechanism 2 and the rotary cutting mechanism 3 are not limited to those described above and can be flexibly adjusted according to the borehole size, cutting requirements, and actual conditions at the mining site to achieve the best cutting effect and meet the needs of different open-pit mining scenarios. Furthermore, the number of supports 201 and their associated components of the hydraulic support mechanism 2, and the base 301 and its associated components of the hydraulic rotary cutting mechanism 3, can also be increased or decreased according to the diameter of the main body 1, the borehole size, and cutting requirements to adapt to changing usage needs and ensure the practicality and reliability of the device. The hydraulic slip ring 4 mentioned in the text is a mature device commonly used in the existing mechanical field. Its core function is to ensure that the rotation of the main body 1 does not affect the normal supporting function of the hydraulic support mechanism 2, while also ensuring a continuous and stable supply of hydraulic oil between the main body 1 (rotating component) and the hydraulic support mechanism 2 (fixed component), providing a strong guarantee for the reliable operation of the device.

[0035] Working principle: In use, first connect the main body 1 to the drill rod of the drilling rig via the external thread at the upper end. Then, the drilling rig hydraulic system is started, and hydraulic oil flows into the oil pipe channel 101 through the oil inlet pipe and reaches the hydraulic slip ring 4. The hydraulic slip ring 4 distributes the hydraulic oil to each support 201 of the two sets of hydraulic support mechanisms 2, pushing the telescopic outriggers 202 to extend until the support plate 203 is tightly attached to the inner wall of the blast hole, thereby stably supporting and fixing the entire device inside the blast hole.

[0036] After the device is fixed, hydraulic oil continues to enter the oil pipe loop 102 through the oil pipe channel, and then reaches each base 301 of the hydraulic rotary cutting mechanism 3 through the through hole and branch connector, pushing the telescopic rod 302 to extend, so that the cutting teeth 304 on the drill bit 303 contact the inner wall of the blast hole. At the same time, the drilling rig drives the main body 1 to rotate, and the rotary cutting mechanism 3 continues to extend under the push of the hydraulic system. The drill bit 303 rotates and gradually penetrates deeper, finally cutting a circumferential slit of the required depth on the inner wall of the blast hole.

[0037] In practical use, this device can achieve intelligent cutting control through the drilling rig control system and sensors. During the rotary cutting process, the hydraulic system can provide real-time feedback on the rotational pressure, which is closely related to the rock strength. After receiving this pressure information, the drilling rig system automatically adjusts the hydraulic thrust of the hydraulic cutting drill bit, thereby achieving precise control of the circumferential cutting operation and ensuring that the cutting process meets the expected mining process requirements. Of course, the intelligent control method here is a conventional technical means, and those skilled in the art can implement it in combination with conventional methods, so it will not be elaborated further here.

[0038] Meanwhile, the pressure at the drill bit's working face can be transmitted to the drilling rig's operating system via a pressure sensor. The operating system analyzes and processes the sensed pressure, and adjusts the working face pressure in real time accordingly. This further optimizes cutting parameters, improves cutting efficiency, extends equipment lifespan, and ensures the efficient and stable operation of the entire circumferential cutting device in open-pit mining operations.

[0039] The present invention has been described in detail above through specific and preferred embodiments. However, those skilled in the art should understand that the present invention is not limited to the embodiments described above. Any modifications or equivalent substitutions made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A blasthole annular slitting device for use in surface mining, characterised in that: The device includes a body (1), the upper outer peripheral wall of which is provided with external threads, and the lower outer peripheral wall of which is provided with at least one set of hydraulic support mechanisms (2) and at least one set of hydraulic rotary cutting mechanisms (3) at intervals. The hydraulic support mechanisms (2) are rotatably connected to the outer peripheral wall of the body (1). The hydraulic support mechanisms (2) are used to support and fix the entire device in the borehole, and the hydraulic rotary cutting mechanisms (3) are used to cut the circumferential slits of the borehole. The hydraulic support mechanisms (2) and the hydraulic rotary cutting mechanisms (3) can be radially adjusted under the push of the hydraulic system.

2. A device for ring slitting of blastholes for surface mining according to claim 1, characterized in that: The hydraulic support mechanism (2) is provided in two sets, and the hydraulic rotary cutting mechanism (3) is provided in one set.

3. A device for ring slitting of blastholes for surface mining according to claim 2, characterised in that: The hydraulic rotary cutting mechanism (3) is located between the two sets of hydraulic support mechanisms (2).

4. A device for ring slitting of blastholes for surface mining according to any one of claims 1-3, characterized in that: The hydraulic support mechanism (2) is rotatably connected to the outer peripheral wall of the body (1) through a hydraulic slip ring (4).

5. A device for ring slitting of blastholes for surface mining according to claim 4, characterised in that: The hydraulic support mechanism (2) includes multiple sets of supports (201) arranged in a ring array on the outer peripheral wall of the hydraulic slip ring (4). The other end of the support (201) is slidably connected to a telescopic leg (202), and the end of the telescopic leg (202) is connected to a support plate (203).

6. A device for ring slitting of blastholes for surface mining according to claim 4, characterized in that: The hydraulic rotary cutting mechanism (3) includes a base (301) arranged in a ring array on the outer peripheral wall of the body (1). The other end of the base (301) is slidably connected to a telescopic rod (302). The end of the telescopic rod (302) is connected to a drill bit (303). The outer side of the drill bit (303) is evenly distributed with multiple cutting teeth (304).

7. A device for ring slitting of blastholes for surface mining according to claim 5, characterized in that: The hydraulic support mechanism (2) includes four sets of supports (201) arranged in a ring array, as well as their matching telescopic outriggers (202) and support plates (203).

8. A device for ring slitting of blastholes for surface mining according to claim 6, characterized in that: The hydraulic rotary cutting mechanism (3) includes four sets of bases (301) arranged in a ring array and their matching telescopic rods (302), drill bits (303) and cutting teeth (304).

9. A device for ring slitting of blastholes for surface mining according to any one of claims 5-8, characterized in that: The main body (1) has an oil pipe channel (101) in the axial direction and an oil pipe ring (102) in the radial direction. The oil pipe channel (101) extends from the top of the main body (1) to the lowest hydraulic support mechanism (2), and one side of the oil pipe channel (101) is connected to two hydraulic slip rings (4) and the oil pipe ring (102) from top to bottom. The oil pipe ring (102) is located near the hydraulic rotary cutting mechanism (3), and a through hole is also provided on the outer peripheral wall of the oil pipe ring (102) for the oil pipe to pass through and connect to the hydraulic rotary cutting mechanism (3).

10. A device for ring slitting of blastholes for surface mining according to claim 5 or 7, characterised in that: The support plate (203) is a circular rubber plate.

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