The subject of the invention is an electric mining drill with a water cooling system.

Mining drills, including electric ones, to be used in mines are known in the industry.

Patent no. PAT.162438 describes a hydraulic drifter drill. The invention solves the problem of blowing out the drill cuttings while drilling with drifter drills. The hydraulic drill is characteristic in that the compressed air is fed from the connection through a channel directly into the chamber where the percussive contact of the hammer face with the mining tool takes place.

The description in application no. PL404712 reveals a method of safely turning off a manual drill, in particular a mining one, in the event of a drill jam and a manual drill, in particular a mining one. The manner of turning off a manual drill safely, in particular a mining drill, in the event of a drill jam is characteristic in that when the drill is rotating clockwise the vertical part of the handle is held in the operator’s right hand and the manual drill started by the operator’s left hand rotary motion (Zl) of the control lever towards the operator, once the drill jams and is abruptly immobilized, as a result of the reaction of the engine torque forces the manual drill’s handle to turn in the direction opposite to the drill’s rotation. This in turn causes a rotary reflex of the operator’s left hand resting on the handle of the control lever in the direction (Z3) away from the operator, resulting in switching off the manual drill immediately. The subject of the invention is also a manual drill to utilize the method, where a control lever placed perpendicularly to the drill axis and fixed on the casing of the manual drill motor using the valve system, starts the manual drill by rotary motion (Zl) towards the operator, if held in the operator’s left hand and with the drill rotating in a clockwise motion. If held in the operator’s right hand with the drill rotating anti-clockwise, it starts the manual drill by rotary motion away from the operator. The description of PL.372128 reveals a drifter drill powered with water or a water/oil emulsion. The drifter drill is powered by water or water/oil emulsion from the main pressure pipeline of the self-advancing roof supports by means of a conduit. The drill consists of a percussive mechanism, a rotation mechanism and a flushing chamber, where the percussive mechanism consists of a cylinder with guide bushings in which the hammer face is mounted and the rotation mechanism is equipped with a rotary engine, which is connected with the drilling rod ending with a drill bit using internal meshing. The power supply medium is fed to the drill through a conduit and further through a branch to the percussive mechanism and through a branch to the rotation mechanism of the drill. The branches are internal spot drillings in the casing of the percussive mechanism.

In the majority of solutions concerned with using drills in mining, hydraulic or pneumatic tools are used due to fire safety. Such solutions are, however, not very comfortable to use. Using electric solutions requires appropriate protection from explosion. The invention in question solves this problem by using an electric drive enclosed and secured in an appropriate way while introducing water circulation into the drill in order to cool the drill engine and the drill and using it as a flushing medium as well.

The electric mining drill according to the invention comprising a drive module comprising an electric engine, mechanical transmission, an electronic control module, a connector lever, a support with a percussive mechanism, a drill head, a drilling rod is characteristic in that the drive module is equipped with a two-phase engine, which is mounted on the casing using screws and completely covered with resin, with the drill having a water cooling system, which is connected with the water jacket inside the casing and then further connected with the system supplying water to the head in which an output shaft is placed, onto which drive is transmitted from the output shaft of the head and which is further connected to the output shaft and further still with an opening in the drilling rod.

Favourably, the crankshaft is also meshed with the gear wheel of the clutch shaft in which an overload coupling is located.

Favourably, the electronic control module of the drill is covered with a radiation shield separating the electronic module from the cooling water flowing through the radiation shield. Favourably, the drill is equipped with a water support whose aim is to press the drill down onto the material during the drilling, where the system supplying water to the drill is connected with the control system of the water support piston through a manual valve controlling the flow so as to push or pull the piston rod and at the same time, independently, by means of a pin mounting the water support to the drill and to the cooling system.

One embodiment of the invention is presented in the drawing, where Fig. 1 presents an arrangement view of the drill and Fig 2 presents a schematic diagram of water circulation in the water system cooling the engine and powering the water support as well as serving as a flushing medium.

Fig 1 presents a drill comprising a drive module comprising an electric engine, mechanical transmission, an electronic control module, a connector lever, a support with a percussive mechanism, a drill head, a drilling rod, where the drive module (1) is equipped with a two- phase engine, which is mounted on the casing using screws and completely covered with resin, with the drill having a water cooling system, which is connected with the water jacket

(3) inside the casing and then further connected with the system supplying water to the head

(4) in which an output shaft (5) is placed, onto which drive is transmitted from the output shaft of the head and which is further connected to the output shaft and further still with an opening in the drilling rod. The crankshaft is also meshed with the gear wheel of the clutch shaft in which an overload coupling is located. Additionally, the electronic control module of the drill is covered with a radiation shield (6) separating the electronic module from the cooling water flowing through the radiation shield (6). Therefore, the water, having cooled the engine, also cools the electronic control elements. The drill may be equipped with a water support (7) whose aim is to press the drill down onto the material during the drilling, where the system supplying water to the drill is connected with the control system of the water support piston through a manual valve controlling the flow so as to push or pull the piston and at the same time, independently, by means of a pin mounting the water support to the drill and to the cooling system

Fig. 2 presents a diagram of water circulation in the system. The hydraulic system of the drill consists of an external water supply installation and a hydraulic installation which is part of the drill equipment.

Water supply is provided from the external water installation. Water is supplied to the reducer (10) where the pressure is reduced to 3 ÷ 5 bar, channelled to the appropriate side of the piston (11) of the water support so as to push or pull the piston rod (12). Part of the water, regardless of the valve position, is directed to the support with percussion (13) and then to the cooling system of the electric engine (2) and next to the head (14). It is then supplied to the drill bit of the drilling rod (16) through an internal opening in the drilling rod (15) also serving as a flushing medium.

The solution makes it possible to use an electric drive in underground conditions and provides protection from an explosion by enclosing the engine and covering it while introducing a simple water supply system as well, which cools the engine and the elements of the drill’s drive.

The presented embodiment does not exhaust the possibilities of using the invention.