Patent Application
20240309604
The present invention relates to a core drill system, and more particularly, to a core drill system for an excavator or a core drill system configured to be connectable to an excavator.
In various construction sites, drilling systems (or drilling apparatuses) capable of excavating rock or a concrete structure are required in order to drill a hole having a predetermined size in rock or a concrete structure to crack the rock or the concrete structure by inserting a crusher into the hole or to measure the thickness of the concrete structure (strength testing of the concrete structure). In general, drilling systems (or drilling apparatuses) are used at various construction sites when excavating rock, perforating a concrete structure, or dismantling a concrete structure.
A representative example of such drilling systems is a hydraulic core drill system. The hydraulic core drill system may be mounted or connected to an end of an excavator, and a core blade may be rotated by a hydraulic motor to perforate a structure. A core drill may be a machine or an apparatus that drills a desired hole in (perforates) a concrete wall or floor.
In particular, when floor drilling is performed by connecting a drilling system to an excavator, the drilling depth or length realized by the drilling system is short, and the drilling depth achievable thereby is also constant. An excavator (or a backhoe) has a height of about 3 meters, and the maximum height of the excavator ranges from 3 meters to 4 meters. Thus, in a drilling system designed to be connected to an excavator, it is difficult for a drilling blade to have a length exceeding 3 meters.
For this reason, in most drilling work sites in which a drilling system is used in a state of being connected to an excavator, a drilling blade of the drilling system has a length of about 1 meter, thus making it difficult to drill a hole to a depth greater than 1 meter. That is, in the case of drilling a hole by connecting a drilling system to an end of an excavator, it is impossible to adjust the length or height of a pillar of the drilling system, which is erected on the floor in a vertical direction, and thus there is a problem in that a drilling depth is limited and cannot be flexibly changed.
Due to this limitation in drilling depth, it is fundamentally impossible to drill a hole to a depth greater than 1 meter when performing drilling work by connecting a drilling system to an excavator. Therefore, there is a problem in that a conventional drilling system designed to be connected to an excavator is not suitable for deep drilling work.
The present invention proposes a drilling system for an excavator (or an excavator-mountable drilling system) capable of solving the above problems.
A technical task of the present invention is to provide a core drill system for an excavator.
The technical tasks to be accomplished by the present invention are not limited to the above-mentioned technical task, and other technical tasks not mentioned herein will be clearly understood by those skilled in the art from the following description.
In order to accomplish the above technical task, a core drill system for an excavator according to the present invention may include an excavator connection unit configured to be coupled to an excavator, a pillar unit mounted in a vertical direction beside the excavator connection unit, a support frame unit configured to support the excavator connection unit and the pillar unit, a core drill unit engaged with and supported by a gear unit provided at the pillar unit, the core drill unit being configured to perforate an object, and a first motor configured to supply power to the core drill unit so that the core drill unit moves in the vertical direction to perforate the object. The pillar unit may include a plurality of connection portions, and the plurality of connection portions may be connected to a support frame provided at the support frame unit. The pillar unit may be provided so as to be mountable and demountable through the plurality of connection portions.
In the core drill system for an excavator, the gear unit provided at the pillar unit may include a rack gear, and the core drill unit may include a core body configured to define a framework of the core drill unit and to be engaged with the rack gear so as to be movable upward and downward and a core blade connected to the core body to perforate the object. The core drill system for an excavator may further include a second motor configured to supply rotational power to the core blade.
The core drill system for an excavator may further include a reducer connected to the first motor to supply power less than power generated by the first motor to the core drill unit. The core drill unit may perforate the object while being moved downward in the vertical direction by power controlled by the reducer.
The excavator connection unit may include a fixing frame fixedly coupled between the support frame unit and the excavator connection unit and configured to be rotatable 360 degrees and pillar frames extending in a horizontal direction and connected to a distal end of an arm of the excavator and to an end of a tipping link connected to the arm of the excavator.
The first motor may be implemented as a hydraulic motor and may be driven using a pressure control method.
The core blade of the core drill unit may be configured to be connectable to another core blade so that the overall length of the core blade increases.
A core drill system 300 according to the present invention is capable of adjusting the height of a pillar unit 320, thereby not only adjusting a drilling depth but also drilling a hole to a depth that was impossible in the conventional art.
In addition, since a core blade 346 of a core drill unit 340 is capable of increasing in length, the core drill system 300 according to the present invention may drill a deeper hole.
In addition, since the core drill unit 340 moves upward and downward through engagement with a gear unit 323 and is driven using a pressure control method, it is possible to prevent damage to a core blade 346 and to increase the efficiency of perforating work.
In addition, in the core drill system 300 according to the present invention, since a reducer 370 is connected to a motor 360, which supplies power to a core body 344 so that the core drill unit 340 moves upward and downward, it is possible to precisely control upward/downward motion of the core drill unit 340 even when the motor 360 is driven at high power and high speed.
The effects achievable through the invention are not limited to the above-mentioned effects, and other effects not mentioned herein will be clearly understood by those skilled in the art from the following description.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily carry out the present invention.
Hereafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. A detailed description to be disclosed hereinbelow together with the accompanying drawing is to describe embodiments of the present invention and not to describe a unique embodiment for carrying out the present invention. The detailed description below includes details in order to provide a complete understanding. However, those skilled in the art know that the present invention can be carried out without the details.
In the following detailed description of the present invention, references are made to the accompanying drawings that show, by way of illustration, specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It is to be understood that various embodiments of the present invention, although different from one another, are not necessarily mutually exclusive. For example, a particular shape, structure, and characteristic described herein, in connection with one embodiment, may be implemented within other embodiments without departing from the spirit and scope of the present invention. Also, it is to be understood that the positions or arrangements of individual elements in the embodiment may be changed without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, appropriately interpreted, along with the full range equivalent to what the claims claim. In the drawings, like reference numbers refer to the same or similar function throughout.
In the following detailed description of the present invention, references are made to the accompanying drawings that show, by way of illustration, specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It is to be understood that various embodiments of the present invention, although different from one another, are not necessarily mutually exclusive. For example, a particular shape, structure, and characteristic described herein, in connection with one embodiment, may be implemented within other embodiments without departing from the spirit and scope of the present invention. Also, it is to be understood that the positions or arrangements of individual elements in the embodiment may be changed without departing from the spirit and scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, appropriately interpreted, along with the full range equivalent to what the claims claim. In the drawings, like reference numbers refer to the same or similar function throughout.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily carry out the present invention.
Referring to
The excavator connection unit 110 of the core drill system 100 is connected to an end of the excavator. When the core blade drills a hole in the floor or a structure while rotating, vertical vibration inevitably occurs in the core drill system 100. In this case, since the excavator is connected to the core drill system 100 via the excavator connection unit 110, the core drill system 100 is stably supported on the floor.
Referring to
Referring to
The excavator 200 is composed of various components, but some components related to the core drill system according to the present invention will be described in brief in order not to obscure the gist of the present invention. The excavator 200 may include tracks and rollers for movement, an engine for driving, and a cab defining a space for a worker.
The excavator 200 may include a boom 210, an arm 220, a bucket 230, a tipping link 240 coupled and connected to a distal end of the arm 220, and a bucket link 250 coupled to the tipping link. An arm end connector 225 is provided at a distal end of the arm 220 in order to be connected to the bucket 230. A bucket link end connector 255 may be provided at a distal end of the bucket link 250 in order to be connected to the bucket 230. In the present invention, the core drill system may be connected to the excavator 200 instead of the bucket 230 of the excavator 200. That is, the present invention relates to a core drill system for an excavator or an excavator-mountable core drill system.
The present invention proposes a core drill system for an excavator, in which a pillar unit is detachably mounted and a core blade is also detachably mounted so as to be extendable, thereby enabling a worker to appropriately perform work according to a desired drilling depth.
Referring to
The excavator connection unit 310 is provided to connect the core drill system 300 to the excavator 200. The pillar unit 320 is mounted beside the excavator connection unit 310 so as to extend in the vertical direction, and is provided on one side thereof with a gear unit 323 extending in the vertical direction. The core drill unit 340 is engaged with the gear unit 323 so as to be movable upward and downward (in a direction perpendicular to the ground or a surface to be perforated). The core drill system 300 may adjust the drilling depth of the core drill unit 340 or the height of the core drill unit 340 through the gear unit 323.
The support frame unit 330 is a frame unit that supports the excavator connection unit 310 and the pillar unit 320. The support frame unit 330 may include frames (such as a bottom frame) supporting the excavator connection unit 310 and the pillar unit 320.
The core drill unit 340 may include a core body 344 configured to be engaged with the gear unit 323 provided at the pillar unit 320 and a core blade 346 connected to the core body 344 so as to be movable upward and downward to perforate the floor. The core body 344 is a part defining a framework of the core drill unit 340, excluding the core blade 346. In the core drill unit 340, the core blade 346 is configured to be connectable to another core blade so that the core blade 346 increases in length and thus drills a deeper hole.
Referring to
The excavator connection unit 310 may include a plurality of pillar frames 312 and 313, which are coupled to the arm end connector 225 and the bucket link end connector 255 of the excavator 200. The pillar frames 312 and 313 may be, for example, cylindrical pillar frames, and may be provided in the excavator connection unit 310 so as to extend in a horizontal direction. The fixing frame 311 of the excavator connection unit 310 may be provided at a bottom position in the excavator connection unit 310 so as to support frames 314 and 315, which are coupled to both sides of each of the plurality of pillar frames 312 and 313 to support the same. That is, the side frames 314 and 315 may be supported on the fixing frame 311 and may extend in the vertical direction to support the plurality of pillar frames 312 and 313 extending in the horizontal direction.
Referring to
In
The connection portion 321 may be referred to as a first connection portion, and the connection portion 322 may be referred to as a second connection portion. The first connection portion 321 may be provided at a position higher than the second connection portion 322 in the vertical direction in the pillar unit 320. For example, the first connection portion 321 may be provided at a middle portion of the pillar unit 320, and the second connection portion 322 may be provided at a bottom portion or a lower portion of the pillar unit. In this way, since the first connection portion 321 and the second connection portion 322 are located at different heights in the vertical direction in the pillar unit 320, the first connection portion 321 and the second connection portion 322 may be spaced apart from each other at a predetermined interval in the horizontal direction.
The plurality of connection portions 321 and 322 provided in the pillar unit 320 may be formed in a recess shape, and bolts and nuts may be fastened into the connection portions 321 and 322, whereby the pillar unit 320 may be detachably coupled to the support frames 332. Accordingly, since the pillar unit 320 is mountable and demountable through the first connection portion 321 and the second connection portion 322, it is possible to replace or exchange the pillar unit 320. It is also possible to adjust the height or length of the pillar unit 320 by replacing or exchanging the pillar unit 320. For example, a worker may replace the pillar unit 320 with a pillar unit having a height suitable for a desired drilling depth.
Referring to
Referring to
The core blade 346 may be connected to the core body 344, and may be rotated by power received from the motor 350 connected thereto (e.g. a hydraulic motor or an electric motor), thereby drilling a hole in the floor. Preferably, a hydraulic motor may be used as the motor 350 for supplying power (e.g. rotational force) to the core blade 346 during drilling operation. The hydraulic motor 350 may control power to be supplied to the core blade 346 by controlling a flow rate.
A motor (e.g. a hydraulic motor or an electric motor) 360 may be connected to the core body 344. The motor 360 for upward/downward movement may supply power by which the core body 344 engaged with the gear unit 323 is moved upward and downward in the vertical direction during drilling operation.
In this case, the motor 360 for upward/downward movement may be implemented as an electric motor, and a reducer 370 may be connected between the motor 360 for upward/downward movement and the core body 344. The motor 360 for upward/downward movement needs to be driven at a high speed and high power in order to perform drilling operation. The reducer 370 is disposed between the motor 360 for upward/downward movement and the core drill unit 340 in order to precisely control upward/downward motion of the core drill unit 340.
The reducer 370 may control the core drill unit 340 to move slowly upward and downward in the vertical direction. For example, if the reducer 370 is operated at such a predetermined rate that the core drill unit 340 is moved by one pitch of the rack gear 323 when the motor 360 for upward/downward movement rotates 30 times, the upward/downward motion of the core drill unit 340 in the vertical direction may be precisely controlled. A worker may control the reducer 370 using a wired or wireless controller.
In another example, the motor 360 for upward/downward movement may be implemented as a hydraulic motor. The hydraulic motor 360 may be driven using a flow rate control method or a pressure control method. A flow rate control method is generally used in structure dismantling and drilling work sites. A flow rate control method is a method of controlling a flow rate using a flow control valve configured to control a flow rate to supply constant force corresponding to the flow rate. On the other hand, the pressure control method is a method of controlling pressure using a pressure control valve configured to control pressure to appropriately adjust pressure (force) according to a work situation. The flow control valve and the pressure control valve may be controlled during work in various manners using a wired or wireless controller. In the present invention, when a hydraulic motor is used as the motor 360 for upward/downward movement, it may be preferable to drive the hydraulic motor using a pressure control method, rather than using a flow rate control method. The reason for this will be described below in brief.
In general, work of dismantling or perforating a structure formed only of concrete or rock may be sufficiently performed through a flow rate control method. However, because most structures or floors are formed of concrete and reinforcing bars, rather than being formed only of concrete, it may be preferable to control upward/downward motion of the core drill unit 340 using a pressure control method during drilling work. That is, in this case, it may be preferable to drive the hydraulic motor 360 using a pressure control method, rather than using a flow rate control method.
For example, when perforating a structure or floor formed of concrete and reinforcing bars, pulverized concrete is discharged out of a perforated area in the beginning, and then iron powder is discharged due to the reinforcing bars. When perforating a floor or a structure, it is necessary to reduce operating pressure of the core drill unit 340 according to the present invention to be lower than initial pressure at the time of discharge of iron powder out of a perforated area after discharge of pulverized concrete.
The following description will be given on the assumption that the pressure of the hydraulic motor 360 is controlled by a pressure control valve and that the pressure is set to a sufficiently large value, e.g. 50 bar, required to perforate concrete. In general, the strength of a reinforcing bar is higher than that of concrete. Therefore, if perforating work is performed at the pressure of 50 bar without reducing the pressure supplied from the hydraulic motor 360, a reinforcing bar may not be perforated, and the core blade 346 may be damaged. Because there is no need to perforate a reinforcing bar, a worker needs to reduce the pressure to 30 bar at the time of discharge of iron powder out of a perforated area due to the reinforcing bar in order to prevent damage to the core blade 346 and to increase the efficiency of perforating work. That is, a worker may increase the efficiency of perforating work by controlling pressure according to a working situation. In this case, if a flow rate control method is used, the core blade 346 may be damaged due to perforation of the reinforcing bar, and the efficiency of perforating work may be deteriorated. Therefore, the pressure control method may be more preferable than the flow rate control method.
Therefore, in the present invention, it is preferable to drive the hydraulic motor 360 using a pressure control method in order to cause upward/downward motion of the core drill unit 340 during perforating work.
As described above, the core drill system 300 according to the present invention is capable of adjusting the height of the pillar unit 320, thereby not only adjusting a drilling depth but also drilling a hole to a depth that was impossible in the conventional art.
In addition, since the core blade 346 of the core drill unit 340 is capable of increasing in length, the core drill system 300 according to the present invention may drill a deeper hole.
In addition, since the core drill unit 340 moves upward and downward through engagement with the rack gear 323 of the pillar unit 320 via the connection unit and the gear and is driven using a pressure control method, it is possible to prevent damage to the core blade 346 and to increase the efficiency of perforating work.
In addition, in the core drill system 300 according to the present invention, since the reducer 370 is connected to the motor 360, which supplies power to the core body 344 so that the core drill unit 340 moves upward and downward, it is possible to precisely control upward/downward motion of the core drill unit 340 even when the motor 360 is driven at high power and high speed.
The above-described embodiments correspond to combinations of elements and features of the present invention in prescribed forms. The respective elements or features may be considered as selective unless they are explicitly mentioned. Each of the elements or features may be implemented in such a way as not to be combined with other elements or features. Moreover, it is possible to implement an embodiment of the present invention by combining elements and/or features together in part. A sequence of operations explained for each embodiment of the present invention may be modified. Some configurations or features of one embodiment may be included in another embodiment, or may be substituted with corresponding configurations or features of another embodiment. In addition, it will be apparent that an embodiment may be configured by combining claims failing to have relation of explicit citation in the appended claims together or may be included in new claims through amendment after filing an application.
It will be apparent to those skilled in the art that various changes in form and details may be made without departing from the essential characteristics of the invention set forth herein. Accordingly, the above detailed description is not intended to be construed to limit the invention in all aspects and to be considered by way of example. The scope of the invention should be determined by reasonable interpretation of the appended claims and all equivalent modifications made without departing from the invention should be included in the following claims.
The core drill system for an excavator according to the present invention may be used to drill a hole in a concrete floor or the like on construction sites, and thus has industrial applicability.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0012967 | Jan 2021 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/001176 | 1/22/2022 | WO |
