KR-102962421-B1 - POWER TOOLS ASSISTIVE DEVICE

KR102962421B1KR 102962421 B1KR102962421 B1KR 102962421B1KR-102962421-B1

Abstract

An auxiliary device for a power tool is disclosed. The auxiliary device for a power tool according to the present invention is characterized by comprising: a rotating part that rotates by means of a main shaft to rotate a bolt; a supporting part that rotatably supports the rotating part; and a fixed part that is detachably coupled to a tool body that rotatably supports the main shaft and elastically supports the supporting part. According to the present invention, even if the rotation axis of the power tool does not coincide with the direction of gravity or an external force acts on the rotation axis, the positional displacement of the rotation axis is minimized, and the bolt is prevented from disengaging due to its own weight and external force, while allowing the bolt to disengage at a desired timing.

Inventors

박정우
윤성조
김효곤
이나현
이종득
정구봉
최영호

Assignees

한국로봇융합연구원

Dates

Publication Date: 20260507
Application Date: 20240311

Claims (14)

A rotating part that rotates by means of a main shaft to rotate a bolt; A support member that rotatably supports the above-mentioned rotating part; and It includes a fixed part that is detachably coupled to a tool body that rotatably supports the main shaft and elastically supports the support part, The above fixed part is, A fixed frame detachably coupled to the tool body and surrounding the support member with respect to the axial direction of the rotating part; and A structure comprising an elastic support member interposed between the fixed frame and the support member, and elastically supporting the support member in the radial direction of the rotating member. Auxiliary device for power tools.
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In paragraph 1, The above elastic support member forms a ring shape centered on the axial direction of the rotating part, Auxiliary device for power tools.
In paragraph 1, A stepped groove in which the elastic support member engages in the axial direction of the rotating part is formed on the outer surface of the support part and the inner surface of the fixed part frame, respectively. Auxiliary device for power tools.
In paragraph 1, The axial direction of the main shaft and the axial direction of the rotating part coincide with each other. Auxiliary device for power tools.
In paragraph 1, The above support member is, A support frame surrounding the first section of the rotating part based on the axial direction of the rotating part; and A bearing portion interposed between the inner surface of the support frame and the outer surface of the rotating portion, Auxiliary device for power tools.
In paragraph 6, The above bearing portion supports the above rotating portion so as to be rotatable and axially movable, Auxiliary device for power tools.
In paragraph 6, The above rotating part is, A bolt head insertion groove into which a bolt head is inserted; and It includes a conduit connected to the bolt head insertion groove and forming an opening in the first section, The above support frame is connected to a pneumatic system to adsorb and detach the bolt head through pressure regulation of the above pipeline, Auxiliary device for power tools.
In paragraph 8, The above pipeline is, A first conduit connected to the bolt head insertion groove and extending in the axial direction of the rotating part; and A second conduit connecting the first conduit and the opening in the radial direction of the rotating part, Auxiliary device for power tools.
In paragraph 8, The above bearing portion includes a first bearing portion and a second bearing portion spaced apart from each other at a certain distance in the axial direction of the rotating portion, and The above opening is located between the first bearing part and the second bearing part, Auxiliary device for power tools.
In Paragraph 10, The rotating part includes a stepped portion that engages with the support part when moving axially, such that the opening is located between the first bearing part and the second bearing part. Auxiliary device for power tools.
In Paragraph 10, A spacing frame attached to the inner surface of the support frame such that the first bearing portion and the second bearing portion are spaced apart at a certain distance in the axial direction of the rotating portion. Auxiliary device for power tools.
In Paragraph 10, Each of the above first bearing part and the above second bearing part is, A bushing capable of rotation and axial movement in the above-mentioned rotating part; A bearing interposed between the inner surface of the support frame and the bush; and including an oil seal interposed between the inner surface of the support frame and the outer surface of the rotating part. Auxiliary device for power tools.
Main axis; A tool body that rotatably supports the above-mentioned main shaft; and It includes an auxiliary device for power tools that assembles and disassembles bolts by the rotation of the above-mentioned main shaft, and The above auxiliary device for power tools is, A rotating part that rotates by means of the above-mentioned main shaft to rotate the bolt; A support member that rotatably supports the above-mentioned rotating part; and It includes a fixing part that is detachably coupled to the tool body and elastically supports the support part, The above fixed part is, A fixed frame detachably coupled to the tool body and surrounding the support member with respect to the axial direction of the rotating part; and A structure comprising an elastic support member interposed between the fixed frame and the support member, and elastically supporting the support member in the radial direction of the rotating member. Power tools.

Description

Power Tool Assistive Device The present invention relates to an auxiliary device for a power tool, and more specifically, to an auxiliary device for a power tool configured to assemble and disassemble bolts by rotating by means of a rotating shaft. The assembly and disassembly of bolts by robot utilizes a power tool that rotates using electrical signals. A tool that can be attached to the head of the bolt to be assembled or disassembled is fixed to the tip of this power tool. With the power tool mounted, the target position and movement path for performing the bolt assembly and disassembly are pre-trained using a dedicated program. Then, the bolt assembly and disassembly operation is performed by moving according to a planned flowchart or by providing signals for specific tasks. In the event that the positions of the power tool and the bolt deviate from the input positions, the power tool's rotation axis has a limited range of positional degrees of freedom in the direction of the axis intersection so that the tool and the bolt can be flexibly fitted within a certain range. Additionally, as the bolt undergoes axial positional displacement due to its own length while being tightened or loosened during assembly or disassembly, the power tool's rotation axis has a limited range of axial positional displacement to accommodate this. When assembling and disassembling bolts with a robot, if the rotation axis of the power tool aligns with the direction of gravity and no external force is applied, the angular displacement for the orientation degrees of freedom in the intersecting direction relative to the rotation center axis becomes zero, and the tool tip does not deviate from its position. However, if the rotation axis of the power tool does not align with the direction of gravity, attitude displacement due to rotational degrees of freedom occurs in the direction of intersection with the reference center of rotation axis caused by its own weight. This results in the tool tip deviating from its reference position, which consequently causes displacement of the tool tip relative to its reference position, preventing the robot, which operates according to a pre-learned path and position, from performing smooth bolt assembly and disassembly operations. Meanwhile, when assembling or disassembling bolts using power tools, the bolt must remain temporarily attached to the tool to effectively transmit the tool's rotational force to the bolt and prevent it from detaching during operation. To this end, tools made of materials with slight magnetic properties are generally used for bolt assembly and disassembly. However, while utilizing a magnetic tool to maintain the bolt's temporary attachment to the tool can implement the function in a simple manner, the magnetic force applied to the tool is weak, so the bolt can easily detach from the tool due to its own weight or external forces, making it impossible to detach the bolt from the tool at the desired timing. FIG. 1 is a front perspective view of an auxiliary device for a power tool according to an embodiment of the present invention. FIG. 2 is a rear perspective view of an auxiliary device for a power tool according to an embodiment of the present invention. FIG. 3 is a side view showing an auxiliary device for a power tool according to an embodiment of the present invention. FIG. 4 is a side cross-sectional view showing an auxiliary device for a power tool according to an embodiment of the present invention. FIG. 5 is a cross-sectional view showing an auxiliary device for a power tool according to an embodiment of the present invention, and is a drawing showing a pneumatic conduit for adsorption/detachment of a bolt. FIG. 6 is a front view of an auxiliary device for a power tool according to an embodiment of the present invention. Figure 7 is a cross-sectional view of AA' of Figure 5. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention. FIG. 1 is a front view of an auxiliary device (10) for a power tool according to an embodiment of the present invention. FIG. 2 is a rear view of an auxiliary device (10) for a power tool according to an embodiment of the present invention. FIG. 3 is a side view showing an auxiliary device (10) for a power tool according to an embodiment of the present invention. The auxiliary device (10) for a power tool according to the present invention is configured such that the orientation displacement of the rotation axis is minimized even if the rotation axis of the power tool (1) does not coincide with the direction of gravity or if an external force acts on the rotation axis. In addition, the auxiliary device (10) for a power tool of the present invention is configured such that the bolt (B) is prevented