KR-20260065133-A - Drilling safety system for drilling machine

KR20260065133AKR 20260065133 AKR20260065133 AKR 20260065133AKR-20260065133-A

Abstract

The present invention relates to a drilling safety system for a drilling machine. A centralizer comprises a pair of jaws positioned at the tip of a mast to grip or release a drill rod, and hydraulic cylinders supported by the mast that operate the jaws to a gripping or releasing position by means of hydraulic fluid supplied from a hydraulic pump. A hydraulic valve controls the flow of hydraulic fluid supplied from the hydraulic pump to a feed hydraulic motor and hydraulic cylinders. A pressure sensor detects the pressure of the hydraulic fluid, which changes according to the load acting on the feed hydraulic motor when a constant flow rate of hydraulic fluid is supplied to the feed hydraulic motor. Based on the information detected by the pressure sensor, the controller determines that the chain has broken when the pressure of the hydraulic fluid drops below a set pressure, and then controls the hydraulic valve to supply hydraulic fluid to the hydraulic cylinders so that the jaws grip the drill rod.

Inventors

염규홍
김태형
박진산

Assignees

주식회사 현대에버다임

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (7)

A drilling machine comprising a mast, a feed hydraulic motor installed at the rear end of the mast and generating a forward or reverse rotational force by an operating fluid supplied from a hydraulic pump, a drive shaft of the feed hydraulic motor and sprockets installed at the front end of the mast, a chain connected to the sprockets, a drifter fixed to the chain and moving forward and backward on the mast according to the direction of movement of the chain, and a drill rod equipped with a drill bit at the front end and mounted on the drifter, wherein A centralizer comprising a pair of jaws disposed at the tip of the mast for gripping or releasing the drill rod, and hydraulic cylinders supported on the mast for operating the jaws to a gripping position or a releasing position by means of hydraulic fluid supplied from the hydraulic pump; A hydraulic valve that controls the flow of operating fluid supplied from the above hydraulic pump to the above feed hydraulic motor and the above hydraulic cylinders; A pressure sensor that detects the pressure of the hydraulic fluid that changes according to the load acting on the hydraulic motor for the feed when a constant flow rate of hydraulic fluid is supplied to the hydraulic motor for the feed; and A controller that determines that the chain is broken when the pressure of the hydraulic fluid drops below a set pressure based on information detected by the pressure sensor, and then controls the hydraulic valve to supply hydraulic fluid to the hydraulic cylinders so that the jaws grip the drill rod; A drilling safety system for a drilling machine including
In paragraph 1, A drilling safety system for a drilling machine, characterized in that the above jaws are positioned on both sides of the drill rod and grip or release the drill rod as they move linearly by the hydraulic cylinders.
In paragraph 2, Each of the above groups is, A gripping groove having the same curvature as the drill rod is formed on the inner portion facing the drill rod, and A drilling safety system for a drilling machine characterized in that the outer part is connected to the cylinder rod of the corresponding hydraulic cylinder by a connecting pin.
In paragraph 3, Each of the above groups is, A jaw body having the above-mentioned gripping groove; and A connecting block that protrudes from an outer portion of the jaw body in a stepped form lower than the upper portion of the jaw body, receives a cylinder rod of the corresponding hydraulic cylinder in a receiving groove, and inserts the connecting pin through a pin insertion hole corresponding to the connecting hole of the cylinder rod; A drilling safety system for a drilling machine characterized by including
In paragraph 4, The above centralizer is, A drilling safety system for a drilling machine characterized by including a bracket fixed to the mast, guiding the linear movement of the jaws and supporting the hydraulic cylinders.
In paragraph 5, The above bracket is, A lower bracket portion fixed to the mast, configured to support the jaw body and the connecting block from below and having a groove for passing the drill rod, and A drilling safety system for a drilling machine, characterized by including an upper bracket portion fixed to the mast, configured to guide the linear movement of the jaw body along the guide groove by inserting the jaw body into the guide groove while covering the upper side with the above-mentioned connecting block.
In paragraph 1, Each of the above hydraulic cylinders is, A drilling safety system for a drilling machine characterized by being composed of a double-acting hydraulic cylinder that causes the cylinder rod to extend and retract relative to the cylinder body as the hydraulic fluid is alternately supplied to the rod-side space and the head-side space of the cylinder body.

Description

Drilling safety system for drilling machine The present invention relates to a drilling safety system employed in a drilling machine, and more specifically, to a drilling safety system that prevents a drill rod mounted on a drifter from falling when a chain moving a drifter on a mast breaks. Generally, drilling rigs are used to break up rock or drill blast holes for purposes such as ore extraction in quarries, road construction in rocky areas, tunnel construction, and various tunnel construction sites like subway sites, for excavation and rock removal. In such a drilling machine, a drifter is provided to mount a drill rod to perform drilling operations, and a hydraulic motor or hydraulic cylinder is used to move the drifter forward and backward on the mast to provide a drilling force to the drill bit at the tip of the drill rod. For example, in a method using a hydraulic motor, a hydraulic motor is installed at the rear end of the mast, and the drive shaft of the hydraulic motor is connected to sprockets installed at the front end of the mast by a chain to move the drifter on the mast. Meanwhile, if the chain of the drifter suddenly breaks during the drilling operation of the drilling machine, the drifter and the drill rod will fall, and accordingly, the drill rod may fall into the drilled hole and get stuck in the ground along with the drill bit. Drill rods and bits embedded in the ground are virtually impossible to remove unless explosives are detonated at the drilled holes to facilitate quarrying. Furthermore, when the stones shattered by explosives are transported to a quarry and crushed by a crusher, if stones containing rods and bits are inadvertently dropped into the machine, the crusher may be damaged, potentially leading to significant financial losses depending on the circumstances. FIG. 1 is a configuration diagram of a drilling safety system for a drilling machine according to one embodiment of the present invention. FIG. 2 is a perspective view of a centralizer mounted on the tip of a mast in FIG. 1. Figure 3 is a perspective view showing a portion of Figure 2. Figure 4 is a cross-sectional view of Figure 2. Figure 5 is a cross-sectional view taken from a portion of Figure 4. The present invention will be described in detail below with reference to the attached drawings. Here, the same reference numerals are used for identical components, and repetitive descriptions and detailed descriptions of known functions and components that could unnecessarily obscure the essence of the invention are omitted. The embodiments of the present invention are provided to more fully explain the invention to those with average knowledge in the art. Accordingly, the shapes and sizes of the elements in the drawings may be exaggerated for clearer explanation. FIG. 1 is a configuration diagram of a drilling safety system for a drilling machine according to an embodiment of the present invention. FIG. 2 is a perspective view of a centralizer mounted on the tip of a mast in FIG. 1. FIG. 3 is a perspective view showing a portion of FIG. 2. FIG. 4 is a front cross-sectional view of FIG. 2. FIG. 5 is a front cross-sectional view showing a portion of FIG. 4. Referring to FIGS. 1 to 5, a drilling safety system (100) for a drilling machine according to one embodiment of the present invention is employed in a drilling machine comprising a mast (10), a hydraulic motor (20) for feeding, sprockets, a chain (30), a drifter, and a drill rod (40). Here, the feed hydraulic motor (20) is installed at the rear end of the mast (10) and generates forward or reverse rotational force by the hydraulic fluid supplied from the hydraulic pump (50). The feed hydraulic motor (20) is connected to a directional control valve and can generate forward or reverse rotational force depending on the direction of supply of the hydraulic fluid. Sprockets are installed on the drive shaft of the feed hydraulic motor (20) and on the leading end of the mast (10). The driving sprocket is fixed coaxially to the drive shaft of the feed hydraulic motor (20), and the driven sprocket is rotatably supported on the leading end of the mast (10). The chain (30) is connected to sprockets, namely a driving sprocket and a driven sprocket. The chain (30) moves according to the rotation of the driving sprocket while the sprockets are wound, and transmits the driven sprocket. The drifter is fixed to the chain (30) and moves forward and backward on the mast (10) according to the direction of movement of the chain (30). The drill rod (40) is equipped with a drill bit at its tip and is mounted on the drifter. A drilling safety system (100) for a drilling machine according to one embodiment of the present invention is employed in the aforementioned drilling machine and includes a centralizer (110), a hydraulic valve (120), a pressure sensor (130), and a controller (140). The centralizer (110) is configured to grip or release the drill rod (40), thereby allowing the drill rod (4