KR101504286B1 - Shaft Driving Apparatus for Manufacturing Machine - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft driving apparatus for a machining machine in which rotational and linear motions of a shaft are separated and can be independently generated in various processing machines such as a molding apparatus or a cutting apparatus, A shaft support portion fixedly attached to the main body of the processing machine; A moving shaft provided on the shaft support portion so as to be linearly movable in the axial direction; A rotating shaft provided at a distal end of the moving shaft and coaxially disposed with the moving shaft and rotating with respect to the moving shaft; A coupling member interconnecting the movement shaft and the rotation shaft such that the movement shaft and the rotation axis move together in the axial direction but rotate freely with respect to the movement axis; A moving axis driving means connected to the moving axis to linearly move the moving axis; And a rotary shaft driving means connected to the rotary shaft for rotating the rotary shaft.

Description

Technical Field [0001] The present invention relates to a shaft driving apparatus for a machine tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for rotating and linearly moving a shaft for fixing a tool or a workpiece in a processing machine, and more particularly, And more particularly, to a shaft driving apparatus for a machining machine.

Generally, machining machines such as a molding apparatus, a cutting apparatus, and a grinding apparatus have axes for rotating and linearly moving a tool or a workpiece. As a shaft driving device for rotating and linearly moving such a shaft, a shaft driving assembly of a rotary hydraulic cylinder structure such as that disclosed in Korean Patent Registration No. 10-0732596 (registered on Jun. 20, 2007) has been mainly used.

In the rotary hydraulic cylinder of the above-mentioned patent, a hydraulic cylinder having a piston linearly moving by hydraulic pressure is installed through a hollow shaft motor, the rotor of the motor is mounted on the outer surface of the hydraulic cylinder, So that the hydraulic cylinder can be rotated.

Such a rotary hydraulic cylinder is configured to prevent oil in the cylinder housing from leaking into the cylinder housing and the cylinder body gap by a mechanical seal. However, due to the centrifugal force, there is a problem in that oil seeps into the gap between the mechanical seal and the cylinder body .

In addition, in the ultra-high speed rotary hydraulic cylinder, the impeller blade for cooling the heat generated inside and outside the cylinder by the high-speed rotation of the cylinder is installed so as to protrude to the outside, but only the surface of the cylinder is cooled, There is a problem that can not be done.

In order to solve this problem, Korean Utility Model Publication No. 20-0243368 (registered on Aug. 7, 2001), an impeller is installed between the cylinder housing and the cylinder cover to efficiently cool the heat generated inside, The wing is formed to communicate with the inside of the cylinder housing to increase the suction amount of the air and to position the suction position of the air as the super head of the cylinder to cool the cylinder housing and the cylinder cover outer heat and to form an air flow seat inside the product There is disclosed a rotary hydraulic cylinder for a CNC lathe in which heat generated inside is cooled in a short time to prevent components in the cylinder from being dislodged. However, the rotary hydraulic cylinder of the registration utility model publication can not reduce or eliminate the heat generated by the rotation of the cylinder, and the impeller blade must be additionally constructed, which complicates the structure.

Since the conventional shaft driving device for moving the shaft in the machining machine is required to install a separate sealing device or a cooling device by rotation of the shaft, the structure of the system is complicated and inefficient. In the system for rotating the shaft, There is a problem that the efficiency of the entire system of the shaft driving device for linearly moving and rotating the shaft is lowered.

Korean Registered Patent No. 10-0732596 (Registered Date June 20, 2007) Korean Utility Model Registration No. 20-0243368 (registered date August 7, 2001)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to divide a shaft into two shaft members (a moving shaft and a rotating shaft) arranged coaxially so that one shaft member is linearly moved by a linear driving unit And the other shaft member is rotated by the rotation drive unit so that the two shaft members translationally move together when they are linearly moved and rotate only one shaft member independently during the rotation, And to provide a shaft drive apparatus for a machining machine capable of improving efficiency.

According to an aspect of the present invention, there is provided a cutting machine comprising: a shaft support portion fixedly mounted on a main body of a processing machine; A moving shaft provided on the shaft support portion so as to be linearly movable in the axial direction; A rotating shaft provided at a distal end of the moving shaft and coaxially disposed with the moving shaft and rotating with respect to the moving shaft; A coupling member interconnecting the movement shaft and the rotation shaft such that the movement shaft and the rotation axis move together in the axial direction but rotate freely with respect to the movement axis; A moving axis driving means connected to the moving axis to linearly move the moving axis; And a rotary shaft driving means connected to the rotary shaft for rotating the rotary shaft.

According to the present invention, when the moving shaft and the rotating shaft are coaxially arranged and connected, and the moving shaft linearly moves by the moving shaft driving means, the rotating shaft is linearly moved together. When the rotating shaft is rotated by the rotating shaft driving means, In the fixed state, only the rotating shaft is rotated with respect to the moving shaft. Therefore, the shaft can be independently rotated and linearly moved with a simple configuration, and the efficiency of the system can be improved.

1 is a cross-sectional view schematically showing a shaft drive apparatus for a machining machine according to a first embodiment of the present invention.
2 is a sectional view taken along the line II in Fig.
3 is a cross-sectional view schematically showing a shaft drive device for a machining machine according to a second embodiment of the present invention.
4 is a cross-sectional view schematically showing a shaft drive apparatus for a machining machine according to a third embodiment of the present invention.
5 is a cross-sectional view schematically showing a shaft drive apparatus for a machining machine according to a fourth embodiment of the present invention.
6 is a cross-sectional view schematically showing a shaft driving apparatus for a machining machine according to a fifth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For the sake of clarity, in various embodiments of the following shaft drive apparatus, the same or similar components are denoted by the same reference numerals, and redundant description is not made.

1 and 2 show a shaft driving apparatus for a machining machine according to a first embodiment of the present invention. The shaft driving apparatus of this first embodiment includes a shaft support portion 10 fixedly mounted on a main body of a machine tool, (20) provided on the distal end portion of the moving shaft (20) so as to be coaxial with the moving shaft (20) and rotating with respect to the moving shaft (20) A moving shaft 20 and a rotating shaft 30 so that the moving shaft 20 and the rotating shaft 30 move together in the axial direction while the rotating shaft 30 freely rotates with respect to the moving shaft 20. [ A moving shaft driving means connected to the moving shaft 20 for linearly moving the moving shaft 20 and a rotating shaft 30 connected to the rotating shaft 30 to rotate the rotating shaft 30, And driving means.

The shaft support 10 may be a frame or a support such as a housing fixed to the main body of the processing machine. In this embodiment, the shaft is supported by the housing.

The moving shaft 20 is connected to a spline structure so that it can move in the axial direction with respect to the shaft supporting portion 10 but can not rotate. 2, a spline groove 21 is formed on the outer surface of the moving shaft 20 along the axial direction and is inserted into the spline groove 21 in the shaft supporting portion 10, 20 and the spline protrusion 22 for restricting the rotational motion of the moving axis 20 is formed so that the moving axis 20 can only linearly move.

Of course, the spline protrusion 22 may protrude along the axial direction on the outer surface of the moving shaft 20, and the spline groove 21 may be formed on the shaft supporting portion 10.

The rear end of the rotation shaft 30 is connected to the distal end of the moving shaft 20 by the coupling member so as to be relatively rotatable. A chuck or a tool for gripping the workpiece may be provided at the tip of the rotary shaft 30.

The coupling member may be constructed using one or more bearings (41, 42). A radial load supporting bearing 41 in which the outer ring and the inner ring are fixedly coupled to the inner surface of the moving shaft 20 and the outer surface of the rotating shaft 30 as in this embodiment, 30, and an axial load bearing member 42 interposed between the end portions of the bearing members.

Alternatively, however, the coupling member may be constructed using a clutch that is contacted and separated while moving in the axial direction by an electric input or by a pneumatic or hydraulic pressure. That is, as shown in the second embodiment of FIG. 3, the coupling member is provided on the distal end of the moving shaft 20, and the movable clutch 43, which is moved in the axial direction as electric energy, pneumatic pressure, And a fixed clutch 44 which is provided at the rear end of the rotary shaft 30 and is engaged or disconnected while being in contact with the movable clutch 43. The movable clutch 43 and the fixed clutch 44, When the rotary shaft 30 rotates, the movable clutch 43 and the fixed clutch 44 are separated from each other and only the rotary shaft 30 is rotated.

Although not shown in the drawing, the moving shaft driving means for linearly moving the moving shaft 20 includes a pneumatic cylinder or a hydraulic cylinder installed inside the shaft supporting portion 10 so as to be connected to the moving shaft 20, A linear motion system using a screw and a motor, a linear motion system using a plurality of pulleys and belts and a motor, and a linear motor system.

1 and 3, the rotary shaft driving means includes a motor 51 mounted on the outer side of the rotary shaft 30 and a motor 51 wound around the outer peripheral surface of the rotary shaft 30 and the shaft of the motor 51, And a rotary power transmitting member 52 such as a belt, a chain, or the like that transmits the power of the motor 51. The motor 51 and the rotary power transmitting member 52 are accommodated in a motor case 53 fixed to the machine body. The shaft of the motor 51 and the outer circumferential surface of the rotary shaft 30 are directly coupled to each other by the rotary power transmitting member 52. However, Or a reduction gear set may be constructed.

When the movable shaft 20 is moved linearly by a certain distance by operating the movable shaft driving means, the rotating shaft 30 connected to the movable shaft 20 linearly moves together with the movable shaft 20, When the rotary shaft driving means operates in a state in which the moving shaft 20 and the rotary shaft 30 linearly move, only the rotary shaft 30 rotates about the rotary shaft 20 in a fixed state .

Fig. 4 shows a third embodiment of the shaft driving apparatus according to the present invention. The shaft driving apparatus of this embodiment is basically the same as the shaft driving apparatus of the first embodiment described above, except that the moving shaft driving means is disposed inside the shaft supporting portion 10 And is integrated into the rotary shaft driving means. That is, in the shaft driving apparatus of this embodiment, a moving shaft driving means (not shown) is also provided inside the motor case 53 of the rotating shaft driving means, and the moving shaft driving means is connected to the moving shaft 20 via the link member 60, And linearly moves the link member 60 to move the moving shaft 20 linearly.

5 shows a fourth embodiment of the shaft driving device according to the present invention. In the shaft driving device of this embodiment, the rotating shaft driving means is constructed on the outer surface of the rotating shaft 30 without the power transmitting device. That is, the rotary shaft driving means of this embodiment includes a cylindrical motor case 54 fixed to the main body of the processing machine and installed so as to penetrate the rotary shaft 30, and a cylindrical motor case 54 installed on the inner peripheral surface of the motor case 54 along the circumferential direction And a rotor 56 rotated by a magnetic field formed between the stator 55 and the stator 55 so as to be spaced apart from the stator 55 by a predetermined distance from the outer surface of the rotating shaft 30 .

The stator 55 has a structure in which a coil is wound around an iron core. The rotor 56 is made of a permanent magnet or a magnetic material. When power is applied to the coil of the stator 55 from the outside, A magnetic field is generated between the rotor 55 and the rotor 56 and the rotor 56 is rotated with respect to the stator 55.

A bearing 54a for rotatably supporting the rotary shaft 30 with respect to the motor case 54 is provided between the motor case 54 and the outer peripheral surface of the rotary shaft 30. [

6 shows a fifth embodiment of the shaft driving apparatus according to the present invention. In the shaft driving apparatus of this embodiment, the rotating shaft driving means for driving the rotating shaft 30 is connected to the leading end of the moving shaft 20, And a rear end portion. The rotating shaft driving means of this embodiment includes a stator 57 fixed to the distal end of the moving shaft 20 and a stator 57 disposed to face the stator 57 at the rear end of the rotating shaft 30, And a rotor 58 rotated by a magnetic field formed between the rotor and the rotor.

In this embodiment, the motor case 59 (shown in Fig. 1) in which the stator 57 and the rotor 58 are accommodated is used as the coupling member without using the bearings 41 and 42 Can be used as the coupling member. That is, one end of the motor case 59 is fixed to the moving shaft 20 and the other end thereof is rotatably connected to the rotating shaft 30 so that the moving shaft 20 moves together with the motor case 59 The rotating shaft 30 is linearly moved so that only the rotating shaft 30 can be rotated with respect to the motor case 59 when the rotating shaft 30 rotates.

In FIG. 6, reference numeral 59a denotes a bearing that rotatably supports the rotating shaft 30 with respect to the motor case 59, but can not move in the axial direction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

10: shaft portion 20: moving shaft
21: spline groove 22: spline projection
30: rotating shaft 41: radial load supporting bearing
42: Axial load supporting bearing 43: Movable clutch
44: fixed clutch 51: motor
52: rotational power transmitting member 53: motor case
54: motor case 55: stator
56: rotor 57: stator
58: Rotor 59: Motor case
60: Link member

Claims (7)

A shaft support portion (10) fixedly mounted on a main body of the processing machine;
A moving shaft (20) provided on the shaft support (10) so as to be linearly movable in the axial direction;
The rear end of the moving shaft 20 is disposed coaxially with the moving shaft 20 at the front end of the moving shaft 20 so as to face the front end of the moving shaft 20 and linearly moves together with the moving shaft 20 in the axial direction, A rotating shaft (30) rotating with respect to the moving shaft (20);
The distal end portion of the moving shaft 20 and the rear end portion of the rotating shaft 30 are moved in the axial direction so that the moving shaft 20 and the rotating shaft 30 move together in the axial direction but the rotating shaft 30 freely rotates with respect to the moving shaft 20. [ A coupling member for interconnecting;
A moving shaft driving means connected to the moving shaft 20 to linearly move the moving shaft 20;
And a rotating shaft driving means connected to the rotating shaft to rotate the rotating shaft. 2. The apparatus according to claim 1, wherein a spline groove (21) is formed on an outer surface of the moving shaft (20) along an axial direction and inserted into the spline groove (21) And a spline projection (22) for restricting rotational movement of the moving shaft (20) is formed. The spline protrusion (22) is protruded along the axial direction on the outer surface of the moving shaft (20), and the spline protrusion (22) is inserted into the shaft supporting portion (10) And a spline groove (21) for restricting the rotational motion of the moving shaft (20) is formed. And a rotary power transmitting member (52) for transmitting the rotational force of the motor (51) to the rotary shaft (30). The rotary power transmission device according to claim 1, wherein the rotary shaft driving means comprises: And a shaft driving device for a machine tool. 2. The shaft drive apparatus for a machining tool according to claim 1, wherein the coupling member comprises at least one bearing (41, 42). 2. The hydraulic excavator according to claim 1, wherein the coupling member comprises: a movable clutch (43) mounted on a distal end of the moving shaft (20) and adapted to move in the axial direction when electric energy, pneumatic pressure or hydraulic pressure is applied; And a fixed clutch (44) coupled to or separated from the rear end in contact with the movable clutch (43). 2. The apparatus according to claim 1, wherein the moving shaft driving means is integrated with the rotating shaft driving means, and the moving shaft (20) and the moving shaft driving means are connected via the link member (60) 60) is linearly moved so that the moving shaft (20) is moved linearly.

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