Electric turret locking device

Abstract

The present invention relates to an electric turret locking device for machine tools that enables rotation and locking of a turret disk through electric driving. In the electric turret locking device, a main shaft is separated from a rotary unit by a conversion clutch, the conversion clutch is fixed to a piston housing, self-locking is formed in a worm gear of the rotary unit, and a fixed uneven coupling and a rotary fixed coupling are fixed by moving uneven couplings, thereby providing a main feature in which a strong locking force can be obtained without driving a separate hydraulic device for disk locking.

Description

Electric turret locking device

[0001] The present invention relates to an electric turret locking device, and more particularly, to an electric turret locking device for a machine tool capable of rotating a turret disk and locking the disk through electric drive.

[0002] Currently, the need for electrification is growing in the machine tool industry due to the global shift to smart factories, global environmental regulations, and trends toward safety and energy efficiency.

[0003] Machine tools are machines that process mechanical parts used in core industries such as automobiles, shipbuilding, semiconductors, displays, IT, and aerospace. Among these, lathes are comprised of a chuck for holding the workpiece, a spindle for rotating it, a tailstock to support the center of the workpiece, and a turret tool holder equipped with cutting tools. However, conventional lathes primarily rely on hydraulics as their driving force, necessitating the development of motorized modules to meet the global demand for electrification.

[0004] Meanwhile, conventional turret tool holders have used a hydraulically operated clamping / unclamping method in which a piston within the body, operated by hydraulic pressure, moves axially forward to lock the turret, thereby advancing the lifting axis of the main spindle, thereby switching the clamped positioning part to an unclamped state.

[0005] However, this conventional clamping method has caused problems such as noise and oil leakage due to high-pressure hydraulic devices, so there is a need to develop technology to overcome these problems.

[0006] The present invention is intended to solve the above-mentioned problems, and its purpose is to provide an electric turret locking device that removes a hydraulic device from an existing hydraulic turret system.

[0007] Another object of the present invention is to provide an electric turret locking device for a machine tool that provides a strong disk locking force without a hydraulic device.

[0008] Another object of the present invention is to provide a rotating device and a locking device for a disk driven by a single motor.

[0009] The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems to be solved by the present invention that are not mentioned herein will be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0010] In order to solve the above-described problem, an electric turret locking device according to the present invention may be configured to include a tool post body, a main shaft extending forward and backward from the tool post body and rotatably installed with respect to the tool post body, a disk installed at a front end of the main shaft and rotating integrally with the main shaft, a rotating part installed in a tubular shape surrounding one outer surface of the main shaft and rotating by receiving power from a driving part, a clutch part installed in a ring shape that can move forward and backward on the outer surface of the main shaft at the rear of the rotating part, a pin formed at the front end being pin-coupled with the rear end of the rotating part to transmit the rotational force of the rotating part to the main shaft, and a locking part having a fixed concave-convex coupling installed at a front end of the tool post body, a rotating concave-convex coupling installed at a rear end of the disk, and a movable concave-convex coupling that is simultaneously coupled to the rear of the fixed concave-convex coupling and the rotating concave-convex coupling.

[0011] Preferably, the clutch unit may further include a switching clutch that is installed at the rear of the rotating unit so as to be able to move forward and backward by key-engaging with the outer surface of the main shaft, and that rotates integrally with the main shaft, and has a rotating pin formed at the front end thereof that engages with a rotating pin groove formed at the rear end of the rotating unit; a piston housing that is fixedly installed at the rear of the switching clutch at the inside of the tool post body and has an air cylinder formed therein; a piston that moves forward by air pressure applied to the inside of the air cylinder; a movable member formed by a ring that is connected forward at the front end of the piston, and whose inner surface is coupled with the outer surface of the switching clutch so that the switching clutch moves forward and backward integrally with the piston; and an elastic member that is installed at one side of the inside of the air cylinder and applies an elastic force to push the piston backward.

[0012] Preferably, the switching clutch may be characterized in that a fixing member is formed at the rear end to be coupled to a fixing member groove formed at the front end of the piston housing.

[0013] Preferably, the locking part may further include a linear feed screw formed with a thread at the front end of the rotating part, a rotating concave-convex coupling fixedly installed at the rear end of the disk, a fixed concave-convex coupling fixedly installed at the front end of the tool body, but having an inner diameter larger than the outer diameter of the rotating concave-convex coupling, and a movable concave-convex coupling installed so as to be able to move forward and backward along the linear feed screw and forming a front surface that is simultaneously coupled to the rear surfaces of the rotating concave-convex coupling and the fixed concave-convex coupling.

[0014] Preferably, the rotating part may further include a wheel housing that is installed in a tubular shape that surrounds the outer surface of the main shaft at the rear of the disk, has a worm gear screw thread formed on the outer surface, and can rotate separately from the main shaft, and a pair of worm shafts that are installed to mesh with the worm gear screw threads at the upper and lower ends of the inner side of the tool body and receive power from the driving part to rotate the wheel housing.

[0015] Preferably, the pair of worm shafts may be installed so as to be vertically opposed to each other with respect to the wheel housing.

[0016] The electric turret locking device according to the present invention includes a configuration of a locking part linked to an electric-driven rotating part, and thus has the effect of replacing an existing hydraulic turret system.

[0017] The electric turret locking device according to the present invention has the effect of obtaining a strong locking force without driving a separate hydraulic device for disk locking, by separating the main shaft from the rotating part by the switching clutch, fixing the switching clutch to the piston housing, forming a self-locking in the worm gear of the rotating part, and fixing the fixed concave-convex coupling and the rotating fixed coupling by the moving concave-convex coupling.

[0018] The electric turret locking device according to the present invention has the effect of providing a rotating device and a locking device of a disk driven by a single motor due to the configuration of a clutch unit and a locking unit connected to a rotating unit driven by a single motor.

[0019] FIG. 1 is a side cross-sectional view showing a disk in a locked state according to one embodiment of an electric turret locking device according to the present invention.

[0020] FIG. 2a is an enlarged view of part A of FIG. 1, showing an enlarged view of the clutch portion when the disk is in a locked state according to one embodiment.

[0021] FIG. 2b is an enlarged view of part A of FIG. 1, showing an enlarged view of the clutch unit when the disk is in an unlocked state according to one embodiment.

[0022] FIG. 3a is an enlarged view of part B of FIG. 1, showing an enlarged view of the locking portion when the disk is in a locked state according to one embodiment.

[0023] FIG. 3b is an enlarged view of part B of FIG. 1, showing an enlarged view of the locking portion when the disk is in an unlocked state according to one embodiment.

[0024] FIG. 4 is an embodiment of an electric turret locking device according to the present invention, in which (a) shows the rotational motion direction and linear motion direction of each component when the disk is locked, and (b) shows the rotational motion direction and linear motion direction of each component when the disk is unlocked.

[0025] Figure 5 is a conceptual diagram showing the form in which the worm shaft meshes with the worm gear screw thread of the wheel housing.

[0026] <Explanation of symbols>

[0027] 1: Tool body

[0028] 2: Disk

[0029] 3: Main shaft

[0030] 31: Combination key

[0031] 4: Rotating part

[0032] 41: Wheel housing

[0033] 411: Worm gear thread

[0034] 412: Linear feed screw

[0035] 413: Rotating pin home

[0036] 42: Worm shaft

[0037] 5: Clutch section

[0038] 51: Transmission clutch

[0039] 511: Rotating pin

[0040] 512: Fixed member

[0041] 52: Piston housing

[0042] 521: Fixed member home

[0043] 53: Air cylinder

[0044] 54: Piston

[0045] 55: Movable parts

[0046] 56: Elastic member

[0047] 57: Clutch sensor

[0048] 571: Forward clutch sensor

[0049] 572: Reverse clutch sensor

[0050] 6: Locking part

[0051] 61: Fixed ridged coupling

[0052] 62: Rotating ridged coupling

[0053] 63: Moving concave coupling

[0054] 631: Spring member

[0055] 64: Locking sensor

[0056] 641: Forward locking sensor

[0057] 642: Reverse locking sensor

[0058] 7: Encoder section

[0059] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. In addition, the terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated otherwise.

[0060] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Meanwhile, schematic and detailed descriptions of the configurations, operations, and effects readily apparent to those skilled in the art will be briefly or omitted, focusing on the details relevant to the present invention.

[0061] First, as illustrated in FIG. 1, the electric turret locking device according to the present invention is configured to include a tool body (1), a main shaft (3), a disk (2), a rotating part (4), a clutch part (5), and a locking part (6).

[0062] In the present invention, one direction in which the disk (2) is installed on the tool body (1) is set to be forward, and the other direction is set to be rear.

[0063] The above tool post body (1) corresponds to the body of the tool post and can be installed in a machine tool such as an electric lathe. In addition, a main shaft (3) and a rotating part (4) that rotates the main shaft (3) are installed on the inside, and a disk (2) is installed on the front so as to be rotatable.

[0064] Next, the main shaft (3) extends forward and backward to the tool body (1) and is installed rotatably with respect to the tool body (1).

[0065] Specifically, the main shaft (3) can be formed in a cylindrical shape and installed in a form in which one rear side is inserted into the tool body (1).

[0066] Next, the above disk (2) is installed at the front end of the main shaft (3) and can rotate integrally with the main shaft (3).

[0067] Specifically, the front part of the disk (2) can have multiple tools installed and can be indexed to rotate as needed so that a tool suitable for machining the workpiece is positioned at the workpiece position.

[0068] Next, the above-mentioned rotating part (4) is installed in a tubular shape that surrounds one side of the outer surface of the main shaft (3) and can rotate by receiving power from the driving part.

[0069] Specifically, as illustrated in FIG. 1, the rotating part (4) may be configured to include a wheel housing (41) and a worm shaft (42).

[0070] The above wheel housing (41) is installed in a tubular shape that surrounds the outer surface of the main shaft (3) at the rear of the disc (2). In addition, linear transfer screw (412) threads and worm gear threads (411) can be sequentially formed in the front and rear of the outer surface.

[0071] In addition, the wheel housing (41) is formed in a tubular shape surrounding the main shaft (3), but can rotate independently of the main shaft (3). That is, even when the main shaft (3) is stationary, the wheel housing (41) can rotate.

[0072] In addition, the worm shaft (42) is provided as a pair and is installed so as to mesh with the worm gear screw thread (411) of the wheel housing (41) at the upper and lower ends inside the tool body (1). In addition, it receives power from the driving unit by the electric motor and serves to rotate the wheel housing (41).

[0073] In addition, the wheel housing (41) and the worm shaft (42) are formed in a long worm gear structure and can be formed in a convex tooth shape and a concave tooth shape.

[0074] Compared to standard worm gears, long-distance worm gears have two to four times more contact between the intersecting teeth of the worm and wheel, and a tooth contact shape that facilitates lubrication. Furthermore, they are three times more resistant to external shocks, resulting in superior efficiency, high reduction ratios, and miniaturization. Furthermore, they offer the advantages of reduced noise, vibration, and roughness, as well as low frictional heat generation, resulting in a long service life.

[0075] In addition, an important feature of the long worm gear is self-locking. That is, it has a feature that prevents reverse driving, which can prevent the wheel housing (41) from rotating in reverse.

[0076] Basically, the worm gear drive method has less backlash than the general gear method, but the worm shaft (42) according to the present invention is designed to have no backlash effect and high power transmission power due to the shape in which the teeth of the long worm mesh with the worm gear screw thread (411).

[0077] Here, since the present invention is provided with a pair of worm shafts (42), power loss is lower than that of a single worm shaft structure, and a high fixing effect of the wheel housing (41) when stopped can be expected.

[0078] More specifically, a pair of worm shafts (142) are installed facing each other vertically with respect to the wheel housing (41), and rotate in opposite directions to rotate the wheel housing (41).

[0079] At this time, a mating surface that compensates for the backlash that may be formed minutely at one end is formed at the other end, thereby minimizing the shock and noise caused by the backlash that may occur when the wheel housing (41) rotates from one direction to the opposite direction.

[0080] And since the worm shaft (42) is installed as a pair, when the worm shaft (42) is fixed, the wheel housing (41) is firmly fixed and cannot rotate, and the loss of power transmitted to the wheel housing (41) when the worm shaft (42) rotates is reduced.

[0081] FIG. 5 is a conceptual diagram showing a form in which a worm shaft (42) is engaged with a worm gear screw thread (411) of a wheel housing (41), and with reference to FIG. 5, backlash A between the upper worm shaft and the upper worm gear screw thread (411) is compensated for by the meshing surface C of the lower worm shaft and the lower worm gear screw thread (411), and backlash D between the lower worm shaft and the lower worm gear screw thread (411) is compensated for by the meshing surface B of the upper worm shaft and the upper worm gear screw thread (411), so that the movement of the wheel housing (41) due to backlash can be minimized.

[0082] Next, as shown in FIGS. 2a and 2b, the clutch unit (5) is installed in a ring shape that can move forward and backward on the outer surface of the main shaft (3) at the rear of the rotating unit (4), and a pin formed at the front end can be pin-coupled with the rear end of the rotating unit (4) to transmit the rotational power of the rotating unit (4) to the main shaft (3).

[0083] Specifically, the clutch unit (5) may be configured to include a switching clutch (51), a piston housing (52), a piston (54), a movable member (55), and an elastic member (56).

[0084] The above-mentioned switching clutch (51) is formed in a ring shape and is installed so as to be able to move forward and backward by key-joining with the outer surface of the main shaft (3) at the rear of the rotating part (4), but can rotate integrally with the main shaft (3).

[0085] In detail, a keyway is formed to extend forward and backward on the inside of the switching clutch (51), and a coupling key (31) is fixed to the outer surface of the main shaft (3) to which the switching clutch (51) is coupled. In addition, by engaging the keyway of the switching clutch (51) with the coupling key (31), the switching clutch (51) can move forward and backward along the longitudinal direction of the main shaft (3).

[0086] In addition, the switching clutch (51) is formed with a rotary pin (511) that protrudes forward from the front end. At this time, a rotary pin groove (413) that is connected to the rotary pin (511) is formed at the rear end of the rotating part (4), and the rotary pin (511) is connected to the rotary pin groove (413), thereby causing the switching clutch (51) to rotate together with the rotating part (4). That is, the switching clutch (51) is connected to the main shaft (3) by a key combination, so that only horizontal movement is possible with respect to the main shaft (3) and vertical movement is impossible.

[0087] And, as the switching clutch (51) is connected to the rotating part (4), the rotational power of the rotating part (4) is transmitted to the main shaft (3).

[0088] Preferably, the rotation pin groove (413) of the rotating part (4) to which the rotation pin (511) of the switching clutch (51) is coupled is formed at the rear end of the wheel housing (41). That is, the rotational force can be transmitted to the main shaft (3) by coupling the switching clutch (51) to the rear end of the wheel housing (41) that can be rotated by the worm shaft (42).

[0089] In addition, the piston housing (52) is fixedly installed at the rear of the switching clutch (51) inside the tool post body (1) and an air cylinder (53) is formed therein. Specifically, the piston housing (52) is fixedly installed at the rear of the main shaft (3) to the tool post body (1). In addition, a path for injecting air pressure is formed at the rear of the air cylinder (53).

[0090] In addition, the piston (54) is installed so that it can move forward by air pressure applied to the inside of the air cylinder (53).

[0091] In addition, the movable member (55) is formed as a ring that is connected forward from the front end of the piston (54). The inner surface of the movable member (55) is fixedly connected to the outer surface of the switching clutch (51), and the switching clutch (51) moves forward and backward as one unit with the piston (54) by the movable member (55).

[0092] Specifically, the movable member (55) is formed in a ring shape that surrounds the outer surface of the switching clutch (51), but cannot rotate. That is, the switching clutch (51) rotates together with the main shaft (3) separately from the movable member (55). However, the movable member (55) is formed in a shape that surrounds a protrusion that protrudes radially from the ring-shaped switching clutch (51), and can move the switching clutch (51) forward or backward depending on the movement of the piston (54).

[0093] In addition, the elastic member (56) is installed on one side of the inside of the air cylinder (53) and can provide elastic force to push the piston (54) backward.

[0094] Specifically, the elastic member (56) is provided as a spring and is installed inside the front part of the air cylinder (53) to apply elastic force to the piston (54).

[0095] That is, when the air pressure applied to the inside of the air cylinder (53) by the elastic member (56) is removed, the piston (54) moves backward by the elastic member (56). In conjunction, when the piston (54) moves backward, the movable member (55) connected to the piston (54) moves the switching clutch (51) backward, and the power transmitted to the main shaft (3) is cut off.

[0096] Meanwhile, the switching clutch (51) is formed with a fixed member (512) that protrudes rearward at the rear end, and the piston housing (52) is formed with a fixed member groove (521) at a position corresponding to the fixed member (512). When the piston (54) moves backward, the rotary pin (511) is separated from the rotary pin groove (413) and the switching clutch (51) moves backward. Then, the fixed member (512) of the switching clutch (51) is fastened to the fixed member groove (521), thereby restricting the rotation of the switching clutch (51). That is, by restricting the rotation of the switching clutch (51), the rotation of the main shaft (3) is also restricted, and the disk (2) is locked in a state where it cannot rotate at the indexing position.

[0097] Additionally, the clutch unit (5) may be configured to further include a clutch sensor (57).

[0098] The above clutch sensor (57) is installed by penetrating one side of the tool body (1) from the outside of the movable member (55), and may be composed of a forward clutch sensor (571) that detects when the movable member (55) moves forward, and a reverse clutch sensor (572) that detects when the movable member (55) moves backward.

[0099] In addition, as illustrated in FIG. 1, the electric turret locking device according to the present invention may further include an encoder unit (7).

[0100] Specifically, the encoder unit (7) can be installed at the rear of the main shaft (3).

[0101] More specifically, the encoder unit (7) can detect the rotational position of the main shaft (3) so that the rotation pin (511) of the switching clutch (51) can be accurately engaged when it engages with the rotation pin groove (413) or the fixed member (512) engages with the fixed member groove (521).

[0102] Next, the locking part (6) can restrict or release the rotation of the disk (2) with respect to the tool body (1).

[0103] Specifically, as shown in FIGS. 3a and 3b, the locking part (6) may include a fixed concave-convex coupling (61) installed at the front of the tool body (1), a rotating concave-convex coupling (62) installed at the rear of the disk (2), and a movable concave-convex coupling (63) that is simultaneously coupled to the rear of the fixed concave-convex coupling (61) and the rotating concave-convex coupling (62).

[0104] More specifically, the locking part (6) can be configured to include a linear transfer screw (412), a rotating concave-convex coupling (62), a fixed concave-convex coupling (61), and a moving concave-convex coupling (63).

[0105] The linear feed screw (412) may be formed as a screw thread at the front end of the rotating section (4). Specifically, the linear feed screw (412) is formed as a screw thread at the front outer surface of the wheel housing (41). The linear feed screw (412) serves to convert rotational motion into linear motion. In other words, it is a configuration that serves to convert rotational force into thrust.

[0106] In addition, the above-mentioned rotary coupling (62) is formed as a ring that is fixedly installed at the rear end of the disk (2).

[0107] In addition, the fixed concave-convex coupling (61) is formed as a ring that is fixedly installed on the front end of the tool body (1) and has an inner diameter larger than the outer diameter of the rotating concave-convex coupling (62). The fixed concave-convex coupling (61) is installed in a form that surrounds the rotating concave-convex coupling (62) that is installed rotatably.

[0108] In addition, the above-mentioned movable concave-convex coupling (63) is formed in a ring shape, is installed so as to be able to move forward and backward along the screw thread of the linear transfer screw (412), and forms a front surface that is simultaneously coupled to the rear surface of the above-mentioned movable concave-convex coupling (62) and the fixed concave-convex coupling (61).

[0109] That is, the rotating concave-convex coupling (62), the fixed concave-convex coupling (61), and the movable concave-convex coupling (63) are connected in a three-piece concave-convex coupling manner. At this time, the movable concave-convex coupling (63) moves forward along the linear feed screw (412) as the wheelhouse rotates, thereby fixing the rotating concave-convex coupling (62) to the fixed concave-convex coupling (61), thereby locking the disk (2). Since thrust is not generated if the linear feed screw (412) does not rotate after fixing, the movable concave-convex coupling (63) is strongly fixed to the coupling position.

[0110] Meanwhile, a spring member (631) may be additionally provided between the rotating concave-convex coupling (62) and the moving concave-convex coupling (63).

[0111] The spring member (631) serves to fix the movable concave coupling (63) so that it does not come off from the linear transport screw (412), and prevents it from coming off to the front or rear of the linear transport screw (412).

[0112] That is, the spring member (631) enables the moving movable coupling (63) to move forward and backward while preventing it from being separated from the linear transfer screw (412).

[0113] Additionally, the locking part (6) may be configured to further include a locking sensor (64).

[0114] The above locking sensor (64) is installed by penetrating one side of the tool body (1) from the outside of the movable concave coupling (63), and may be composed of a forward locking sensor (641) that detects when the movable concave coupling (63) moves forward, and a backward locking sensor (642) that detects when the movable concave coupling (63) moves backward.

[0115] In the electric turret locking device according to the present invention as described above, examples of application of the disk (2) being locked for machining a workpiece and unlocked for tool indexing are as follows.

[0116] FIG. 4 is an embodiment showing the rotational motion direction and linear motion direction of each component when the disk is locked in an electric turret locking device according to the present invention, and FIG. 4 (b) is an embodiment showing the rotational motion direction and linear motion direction of each component when the disk is unlocked. With reference to FIG. 4, the motion direction of each component when the disk is locked and unlocked can be known.

[0117] First, referring to Fig. 4(a), the flow when switching from disk (2) unlocking to locking is as follows.

[0118] Stop applying air pressure to the inside of the air cylinder (53) → Piston (54) moves backward → Movable member (55) and switching clutch (51) moves backward → Rotating pin (511) and rotating pin groove (413) are separated → Fixed member (512) and fixed member groove (521) are combined → Worm shaft (42) rotates in one direction → Wheel housing (41) rotates → Moving concave-convex coupling (63) moves forward → Fixed concave-convex coupling of 3-piece combined and fixed concave-convex coupling (61), rotating concave-convex coupling (62), and moving concave-convex coupling (63) are combined and fixed

[0119] Next, referring to Fig. 4(b), the flow when switching from disk (2) locking to unlocking is as follows.

[0120] Worm shaft (42) rotates in the other direction → Wheel housing (41) rotates → Moving concave-convex coupling (63) moves backward (3-piece concave-convex coupling is released) → Air pressure is applied to the inside of the air cylinder (53) → Piston (54) moves forward → Movable member (55) and switching clutch (51) moves forward → Fixed member (512) and fixed member groove (521) are separated → Rotating pin (511) and rotating pin groove (413) are combined → Worm shaft (42) rotates → Wheel housing (41), switching clutch (51), main shaft (3), and disc (2) rotate

[0121] As described above, the electric turret locking device according to the present invention can achieve both indexing and locking of the turret disk (2) with a single electric motor.

[0122] In particular, it includes a rotating part (4) having a self-locking long-legged worm gear structure, a clutch part (5) that is disconnected from the rotating part (4) and connected to a piston housing (52), and a locking part (6) in which a movable concave-convex coupling (63) that is simultaneously connected to a fixed concave-convex coupling (61) and a rotating concave-convex coupling (62) is strongly fixed in a connecting position by a linear transfer screw (412), so that a strong locking force can be secured without a separate hydraulic device through triple locking.

[0123] The foregoing has broadly described the features and technical advantages of the present invention to better understand the scope of the claims. Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics thereof. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the detailed description, and all changes or modifications derived from the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims

1. Tool body; A main shaft extending forward and backward from the tool post body and rotatably installed with respect to the tool post body; A disk installed at the front end of the main shaft and rotating integrally with the main shaft; A rotating part installed in a tubular shape surrounding one side of the outer surface of the main shaft and rotating by receiving power from the driving part; A clutch unit installed in a ring shape that can move forward and backward on the outer surface of the main shaft at the rear of the above-mentioned rotating unit, and having a pin formed at the front end that is pin-connected with the rear end of the above-mentioned rotating unit to transmit the rotating power of the rotating unit to the main shaft; and An electric turret locking device comprising: a locking unit including a fixed concave-convex coupling installed at the front of the tool body, a rotating concave-convex coupling installed at the rear of the disk, and a movable concave-convex coupling that is simultaneously coupled to the rear of the fixed concave-convex coupling and the rotating concave-convex coupling.

2. In paragraph 1, The above clutch part, A switching clutch installed at the rear of the above rotating part so as to be able to move forward and backward by key-engaging with the outer surface of the main shaft, but rotating integrally with the main shaft, and having a rotating pin formed at the front end that engages with a rotating pin groove formed at the rear end of the above rotating part; A piston housing fixedly installed at the rear of the switching clutch inside the tool body and having an air cylinder formed inside; A piston that moves forward by air pressure applied to the inside of the air cylinder; A movable member formed as a ring connected forward from the front end of the piston, the inner surface of which is coupled with the outer surface of the switching clutch so that the switching clutch moves forward and backward integrally with the piston; and An electric turret locking device further comprising an elastic member installed on one side of the inside of the air cylinder and applying an elastic force to push the piston backward.

3. In paragraph 2, In the above switching clutch, An electric turret locking device characterized in that a fixing member is formed at the rear end to be coupled to a fixing member groove formed at the front end of the piston housing.

4. In paragraph 1, The above locking part, A linear feed screw formed with threads at the front end of the above rotating section; A rotary concave coupling fixedly installed at the rear end of the above disk; A fixed concave-convex coupling fixedly installed at the front end of the above tool body, the fixed concave-convex coupling having an inner diameter larger than the outer diameter of the above rotary concave-convex coupling; An electric turret locking device further comprising a movable concave-convex coupling installed so as to be able to move forward and backward along the linear feed screw, and forming a front surface that is simultaneously coupled to the rear surfaces of the rotating concave-convex coupling and the fixed concave-convex coupling.

5. In paragraph 1, The above rotating part, A wheel housing which is installed in a tubular shape surrounding the outer surface of the main shaft at the rear of the above disk, has a worm gear screw thread formed on the outer surface, and can rotate separately from the main shaft, An electric turret locking device further comprising a pair of worm shafts that are installed to engage with worm gear screw threads at the upper and lower ends of the inner side of the tool body and receive power from the driving unit to rotate the wheel housing.

6. In paragraph 5, The above pair of worm shafts, An electric turret locking device characterized in that it is installed facing upward and downward with respect to the wheel housing.

7. Tool body; A main shaft extending forward and backward from the tool post body and rotatably installed with respect to the tool post body; A disk installed at the front end of the main shaft and rotating integrally with the main shaft; A rotating unit having a wheel housing that is installed in a tubular shape surrounding the outer surface of the main shaft at the rear of the above disk, and having linear feed screw threads and worm gear threads formed in the front and rear of the outer surface, and capable of rotating separately from the main shaft, and a pair of worm shafts that are installed to mesh with the worm gear threads at the upper and lower ends of the inner side of the tool body and receive power from the driving unit to rotate the wheel housing; A clutch unit installed in a ring shape that can move forward and backward on the outer surface of the main shaft at the rear of the above-mentioned rotating unit, and having a pin formed at the front end that is pin-connected with the rear end of the above-mentioned rotating unit to transmit the rotating power of the rotating unit to the main shaft; and An electric turret locking device comprising: a locking unit including a fixed concave-convex coupling installed at the front of the tool body, a rotating concave-convex coupling installed at the rear of the disk, and a movable concave-convex coupling that is simultaneously coupled to the rear of the fixed concave-convex coupling and the rotating concave-convex coupling.

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