KR100948885B1 - Upper frame equipment of steady rest for a heavy-duty crank shaft - Google Patents

Abstract

The present invention relates to an upper frame device of a dustproof tool for a large crankshaft, which is installed on an upper frame and connected to a center quill to transfer a center quill; A deceleration unit installed in the center quill lifting unit to reduce the rotational speed of the center quill lifting unit to fine-tune the center quill; Front quill lifting unit is installed in the upper frame and connected to the front quill to transfer the front quill to the set point and the front quill is automatically or manually transferred; A rear quill lifting unit installed on the upper frame and connected to the rear quill to convey the rear quill to a setting point and to automatically or manually convey the rear quill; The front quill lifting unit and the rear quill lifting unit are respectively provided, the front quill lifting unit and the rear quill lifting unit includes a manual automatic gear changing unit for driving automatically or manually.

Therefore, the outer circumferential surface of the crankshaft is not damaged, and the front and rear quills can be lifted manually or automatically, and the center quill lifting and rear quill lifting information can be accurately measured and confirmed, and the center quill lifting Manual and automatic drive conversion of the part and the rear quill lifting unit can be simplified.

Description

Upper frame equipment of steady rest for a heavy-duty crank shaft}

The present invention relates to an upper frame apparatus for a dustproof opening for a large crankshaft used in a marine engine.

As is well known, the crankshaft, which is a key component of a large marine engine, is one of the core components of a marine engine that is mounted on the marine engine and transfers power by converting the reciprocating motion of the engine piston into rotational motion.

This crankshaft is manufactured as follows. First, a crankshaft material is manufactured in the form of an annular bar having a plurality of grooves formed along a circumferential surface. Then, the material is forged to form flange parts at both ends, and a plurality of crank throws are formed between the flange parts. Manufactured to be continuously molded at different angles.

Such a large crankshaft is processed by being mounted on the dustproof hole for the large crankshaft to prevent the deflection caused by its own weight or vibration generated during processing. The dustproof opening of the large crankshaft includes a base frame installed on the bed, an upper frame installed on the base frame, a center quill installed on the upper frame to support the center lower portion of the large crankshaft, and Front and rear quills are provided to support the front and rear of the rack shaft.

However, the conventional upper frame apparatus of the dustproof for large crankshaft has various problems.

First, the upper frame device of the conventional anti-vibration port is the center quill, the front quill, the rear quill is manually lifted, and thus the lifting operation is very difficult. In addition, since the lifting operation is performed manually, the lifting operation speed is also very slow, and accordingly, the setup time for supporting the crankshaft is relatively high, and the setting state is relatively inaccurate.

Second, the upper end of the center quill, front quill, and rear quill are supported on the outer circumferential surface of the crankshaft. The vibrations generated when machining the crankshaft cause damage such as scratch grooves between the contact surfaces, and such crankshaft damage. Not only affects precision, but also shortens its lifespan.

Third, since the center quill, front quill, and rear quill are manually lifted, it is difficult to finely adjust the lift. Therefore, it is difficult to accurately support the circumference of the crankshaft with the conventional anti-vibration port, and thus, the crankshaft could not be optimally supported.

Fourthly, the conventional upper frame apparatus of the anti-vibration port is made of a single shaft for raising and lowering the front quill and the rear quill. That is, when one end of the shaft is rotated, the front quill or rear quill coupled to the other end of the shaft is lifted. Integral shafts installed on the front quill and rear quill are more damaged than other parts because the weight of the crankshaft is loaded. However, since the shafts are integrally provided, it is very difficult to separate the damaged shafts from the dustproof hole, and the replacement cost of the parts is increased by replacing the entire shaft of a relatively large size.

An object of the present invention for solving the above problems is to provide an upper frame apparatus of a dustproof opening for a large crankshaft in which the outer peripheral surface of the crankshaft is not damaged.

Another object of the present invention is to provide an upper frame apparatus for a dustproof opening for a large crankshaft which enables the front and rear quills to be raised or lowered manually or automatically.

It is still another object of the present invention to provide an upper frame apparatus for a dustproof opening for a large crankshaft which allows fine adjustment of the lifting and lowering of the center quill.

Still another object of the present invention is to provide a front quill screw, a rear quill screw and a rear quill screw for elevating the front quill and the rear quill, and a spline shaft for transmitting power to them, as well as for a large crankshaft which is simply detachable. The present invention provides an upper frame apparatus for a dustproof port.

Still another object of the present invention is to provide an upper frame apparatus for a dustproof opening for a large crankshaft, which enables accurate measurement and confirmation of lifting information of the center quill lifting unit and the rear quill lifting unit.

It is still another object of the present invention to provide an upper frame apparatus for a dustproof opening for a large crankshaft which facilitates manual driving and automatic driving conversion of the center quill lifting unit and the rear quill lifting unit.

The upper frame device of the dustproof for large crankshaft of the present invention for achieving the above object, the bed; A base frame installed on an upper surface of the bed to be seated on or transported along the bed; An upper frame installed on an upper surface of the base frame; A center quill installed at the center of the upper frame to reciprocate in a vertical direction to support a center lower portion of the outer circumferential surface of the crankshaft; Center quill lifting unit is installed on the upper frame and connected to the center quill to transfer the center quill; A deceleration unit installed in the center quill lifting unit to reduce the rotational speed of the center quill lifting unit to fine-tune the center quill; A front quill installed on one side of the upper frame to be reciprocally transported to support one side of the outer circumferential surface of the crankshaft; Front quill lifting unit is installed in the upper frame and connected to the front quill to transfer the front quill to the set point and the front quill is automatically or manually transferred; A rear quill installed on the other side of the upper frame to be reciprocally transported to support the other side of the outer circumferential surface of the crankshaft; A rear quill lifting unit installed on the upper frame and connected to the rear quill to convey the rear quill to a setting point and to automatically or manually convey the rear quill; A manual automatic gear changing unit installed at the front quill lifting unit and the rear quill lifting unit to allow the front quill lifting unit and the rear quill raising unit to be automatically or manually driven; A display unit installed at one side of the base frame and connected to the front quill lifting unit and the rear quill lifting unit to display the driving displacement of the front quill lifting unit and the rear quill lifting unit numerically and displayed; It is connected to the center quill lifting unit, front quill lifting unit, rear quill lifting unit, the display unit to control them; characterized in that it comprises a.

Another feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention, the upper frame is mounted on the upper surface of the base frame and is fixed to the base frame by a fixing bolt, and is formed perpendicular to the center portion A center quill hole coupled to lift the center quill, a front quill hole formed to be inclined at one side and coupled to the front quill, a rear quill hole formed to be inclined at the other side and coupled to the rear quill, and a center quill hole It is formed in the lower portion and consists of a see-through portion that can check the inside.

Another feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention, the center quill, the front quill and the rear quill, respectively, is coupled to the center quill housing and the upper end of the work pad to contact the outer peripheral surface of the large crankshaft And a work pad coupled to the front quill housing and the upper end thereof in contact with the outer circumferential surface of the large crankshaft, and a work pad coupled to the rear quill housing and the upper end thereof in contact with the outer circumferential surface of the large crankshaft. It is made of white metal.

Another feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention, the center quill lifting portion, the center quill screw provided in the center quill housing of the center quill, and the internal thread portion of the inner circumferential surface fixed to the inside of the center quill housing The center quill screw, which is engaged with the center quill screw and is moved along the center quill screw along with the center quill housing when the center quill screw is rotated, and the lift gear which is coupled to the lower part of the center quill screw to rotate the center quill screw. And, a support shaft installed on the upper frame of one side of the center quill screw, an electric gear coupled to the circumference of the support shaft, the first engaging portion and the second engaging portion being formed, and the first engaging portion being meshed with the lift gear. , A drive gear that is engaged with the second engagement portion of the electric gear to drive the electric gear, and one end is connected to the drive gear, and the other end is outside the upper frame. It comprises a protruding drive shaft.

A further feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention is that the drive shaft has a first gear coupled to the circumference of the drive shaft and rotated therewith and engaged with the first gear and smaller in diameter than the first gear. And a second gear of the second gear, the third gear having a smaller diameter than the second gear, and a reduction shaft coupled to the center of the third gear to rotate it, thereby rotating the reduction shaft. The reduction gear is provided to finely adjust the center quill by reducing the rotational speed of the drive shaft through the third gear.

Another feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention, the front quill lifting portion is provided in the front quill housing of the front quill and the front quill screw is formed in the lower end, the interior of the front quill housing It is fixed at the inner circumferential surface and the female thread of the inner circumferential surface is engaged with the front quill screw, and the front quill feed block is moved along the front quill housing along the front quill housing when the front quill screw is rotated, and at one end of the coupling part of the front quill screw. The spline groove is formed to be detachable and the other end is drawn outward of the upper frame and the spline is formed around the spline, and the spline groove is formed on the inner circumferential surface so as to fit with the spline of the spline shaft. Mounted on the clutch gear and the upper frame on one side of the spline shaft. A gear shaft having both ends supported by radial cone roller bearings, a first electric gear coupled to one side of the gear shaft and engaged to the clutch gear, and coupled to the other side of the gear shaft and rotating together. A second electric gear, an encoder coupled to one end of the gear shaft and connected to the controller, the encoder transmitting the rotation information of the gear shaft to the controller, a drive gear engaged with the second electric gear, and the upper It is installed in the frame, connected to the drive gear by the motor shaft, and is connected to the controller and consists of a motor controlled by it.

Another feature of the upper frame device of the large crankshaft stopper of the present invention, the rear quill lifting portion is provided in the rear quill housing of the rear quill and the coupling portion is formed at the bottom, and inside the rear quill housing It is fixed, and the internal thread of the inner circumferential surface is engaged with the rear quill screw, and the rear quill feeding block is moved along the rear quill housing along the rear quill housing when the rear quill screw is rotated, and one end of the rear quill screw is attached and detached. The spline groove is formed so that the coupling groove is formed and the other end is drawn outward of the upper frame, and the spline is formed around the spline groove, and the spline groove is formed on the inner circumferential surface so as to fit with the spline of the spline shaft. On both sides of the spur shaft and the upper frame of the spline shaft A gear shaft supported by the conical roller bearing, a first electric gear coupled to one side of the gear shaft and engaged to the clutch gear, and a second electric gear coupled to and rotated along the other side of the gear shaft. And an encoder coupled to one end of the gear shaft and connected to the controller and transmitting rotational information of the gear shaft to the controller, a drive gear engaged with the second electric gear, and installed in the upper frame and driven It is connected to the gear by a motor shaft and is connected to a controller and consists of a motor controlled by it.

Another feature of the upper frame device of the dustproof opening for a large crankshaft of the present invention, the manual automatic gear change unit, the handle block is installed so as to rotate in the upper frame of the front quill and rear quill, respectively, and one end to the handle block An operation handle that is coupled and rotates the handle block, a top end of which is coupled to the center of the handle block and rotates together with the handle block and forms a center of rotation of the handle block, and is arranged to be perpendicular to the block axis, and one end of the block axis It is coupled to the lower side and the other end is rotated around the block axis when the block shaft rotates, the bush fixing pin coupled to the other end of the link, and the bush fixing pin is coupled to the operating flange of the clutch gear and supported by the operation handle When rotating, the clutch gear moves along the spline of the spline shaft while rotating around the block shaft together with the bush fixing pin. It consists of a bush which allows the clutch gear to be engaged or separated from the first electric gear of the gear shaft.

In the present invention as described above, the center quill, the front quill and the rear quill, respectively, are combined with the center quill housing and the upper end of the work pad contacting the outer circumferential surface of the large crankshaft, and the front quill housing and the upper end of the large The work pad is in contact with the outer circumferential surface of the crankshaft, and the rear quilt housing and the work pad coupled to the upper circumferential surface of the large crankshaft, and the work pad are made of white metal. Therefore, the work surface of the white metal material is in contact with the outer circumferential surface of the crankshaft, so that the outer circumferential surface of the crankshaft is not damaged even if friction occurs around the crankshaft and the workpad surface, thereby improving the accuracy and life of the crankshaft. do.

The center quill lifting unit of the present invention is provided with a reduction unit so as to fine-tune the center quill by reducing the rotational speed of the center quill lifting unit. Therefore, when the reduction shaft is rotated, while the third gear, the second gear, and the first gear are transmitted to the drive shaft, the reduction speed is achieved through the third gear, the second gear, and the first gear, so that the drive shaft can be minutely rotated. You can fine tune the center quill accordingly. Therefore, the center quill can be finely adjusted so that the circumference of the crankshaft can be precisely supported in an optimal state.

The front quill and rear quill of the present invention are provided with a front quill lifting unit and a rear quill lifting unit to automatically lift them. Therefore, the front quill and rear quill are automatically lifted and lifted, which makes the lifting work very convenient and quick, thereby shortening the setup time for supporting the crankshaft and making the setting state relatively accurate.

The present invention is provided with a front quill screw, a rear quill screw for raising and lowering the front quill and the rear quill, and spline shafts for transmitting power thereto, respectively, and the spline shafts have a coupling portion and a rear quill screw. Coupling grooves are respectively formed to be attached to and detached from the coupling portion of the splines, and splines are formed around the spline shafts to be attached to and detached from the spline grooves of the clutch gears. Accordingly, when the spline shafts are pushed into the front quill screw and the rear quill screw side, the coupling grooves of the spline shafts are coupled to the coupling part of the front quill screw and the rear quill screw and the splines of the spline shafts are engaged with the spline grooves of the clutch gears. Pulling the spline shafts to the opposite sides of the front quill screw and the rear quill screw separates the coupling grooves and splines of the spline shafts from the coupling portions and the spline grooves. Therefore, spline shafts, which are the core parts that transmit the driving force of the motor to the front quill and the rear quill, can be easily attached and detached. Therefore, when the parts are damaged, the front quill screw and the rear quill screw can be removed without any disassembly. Only spline shafts can be easily removed.

One end of the gear shaft of the present invention is connected to the controller is provided with an encoder to transmit the rotation information of the gear shaft to the controller. Therefore, the encoder can accurately measure rotation information such as rotation amount, rotation angle and rotation speed of the gear shaft, and display the elevation information of the center quill lifting unit and the rear quill lifting unit by the controller on the display unit. Can be. Therefore, the lifting and lowering information of the center quill lifting unit and the rear quill lifting unit is accurately displayed after being displayed by the encoder and the display unit, so that the setup work of the crankshaft can be more precisely adjusted while viewing the displayed information.

The front quill lifting unit and the rear quill lifting unit of the present invention are provided with a manual automatic gear changing unit so that the front quill raising unit and the rear quill raising unit are automatically or manually driven. Rotating the operation handle of the manual automatic gear change unit moves the spline groove of the clutch gear along the spline of the spline shaft while the bush moves in the direction of the spline shaft, whereby the clutch gear is engaged with or separated from the first electric gear. Therefore, when the clutch gear is engaged with the first electric gear by the manual automatic gear changer of the present invention, the rotational power of the motor is transmitted to the front quill screw and the rear quill screw, so that the front quill and the rear quill can be automatically driven. When the clutch gear is separated from the first electric gear, the rotational power of the motor is blocked, so that the front and rear quills can be manually driven by manually rotating the spline shaft. Therefore, it is possible to simplify the manual driving and the automatic driving conversion of the center quill lifting unit and the rear quill lifting unit through a very simple operation of rotating the operation handle of the manual automatic gear changing unit.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 1 is a schematic cross-sectional view showing an upper frame device of the dustproof for a large crankshaft of the present invention, Figure 2 is a schematic cross-sectional view showing an upper frame, Figure 3 is a schematic partial enlarged cross-sectional view showing a center quilted lifting portion. Figure 4 is a schematic partial enlarged cross-sectional view showing a reduction portion, Figure 5 is a schematic partial enlarged cross-sectional view showing a front quill lifting portion, Figure 6 is a schematic partial enlarged cross-sectional view showing a rear quill lifting portion, Figure 7a to 7c is a front quill lifting portion And schematic partial enlarged cross-sectional views and a side cross-sectional view showing a manual automatic gear changing unit respectively provided in the rear quill lifting unit.

The large crankshaft dustproofing of the present invention, the bed 10, the base frame 20, the upper frame 30, the center quill 40, the center quill lifting portion 50, the reduction unit 60, the front quill 70, the front quill lifting unit 80, the rear quill 90, the rear quill lifting unit 100, a manual automatic gear changing unit 110, a display unit 120, and a controller 130 are provided.

Bed 10, as shown in Figure 1, the base frame 20 is seated and guides the transfer of the base frame 20.

As shown in FIG. 1, the base frame 20 is installed on the upper surface of the bed 10 so as to be seated on the bed 10 or transported along the bed 10.

The upper frame 30 is provided on the upper surface of the base frame 20 as shown in Figs.

The upper frame 30 is provided with a base 31 that is seated on the upper surface of the base frame 20 and fixed to the base frame 20 by fixing bolts 32. A center quill hole 33 is vertically formed in the center portion of the upper frame 30, and the center quill 40 is coupled to the center quill hole 33 so as to be elevated. The front quill hole 34 is formed to be inclined at one side of the upper frame 30, and the front quill 70 is coupled to the front quill hole 34 so as to slide. On the other side of the upper frame 30, the rear quill hole 35 is formed to be inclined, and the rear quill 90 is coupled to the rear quill hole 35 so as to slide. Perspective portion 36 is formed in the lower portion of the center quill hole 33 of the upper frame 30, and the perspective portion 36 has a center quill screw 51 and a center quill feed block of the center quill lifting portion 50. 52, the lift gear 53 is located, it is possible to check the operating state of them from the outside through the see-through 36.

As shown in FIGS. 1 and 3, the center quill 40 is installed in the center of the upper frame 30 so as to reciprocate in a vertical direction to support the center lower portion of the outer circumferential surface of the crankshaft 1.

The center quill 40 is composed of a center quill housing 41 and a work pad 42. The center quill housing 41 is inserted into the center quill hole 33 of the upper frame 30 and is elevated accordingly. The center quill housing 41 is made of alloy steel (SCM440). The work pad 42 is coupled to the upper end of the center quill housing 41 and is in close contact with the outer circumferential surface of the crankshaft 1 to be supported. The work pad 42 is a part which is in direct contact with the journal portion of the crankshaft 1 and is made of a white metal material. The white metal has good abrasion resistance and minimizes the frictional force when contacted with the crankshaft 1 to prevent damage to the crankshaft 1.

1 and 3, the center quill lifting unit 50 is installed in the upper frame 30 and connected to the center quill 40 to transfer the center quill 40.

The center quill lifting portion 50, the center quill screw 51, the center quill feed block 52, the lift gear 53, the support shaft 54, the electric gear 55, the drive gear 56, the drive shaft It consists of 57. The center quill screw 51 is provided in the center quill housing 41 of the center quill 40. The center quill feeding block 52 is fixed to the inside of the center quill housing 41 and the female thread part 52a of the inner circumferential surface is engaged with the center quill screw 51 and the center quill housing when the center quill screw 51 rotates. Together with the 41, it is conveyed along the axial direction of the center quill screw 51. As shown in FIG. The lift gear 53 is coupled to the lower portion of the center quill screw 51 to rotate the center quill screw 51. The support shaft 54 is attached to the upper frame 30 on one side of the center quill screw 51. The electric gear 55 is coupled to the circumference of the support shaft 54, and the first engagement portion 55a and the second engagement portion 55b are formed, and the first engagement portion 55a is attached to the lift gear 53. Are matched. The drive gear 56 is engaged with the second engagement portion 55b of the electric gear 55 to drive the electric gear 55. One end of the drive shaft 57 is connected to the drive gear 56, and the other end thereof protrudes out of the upper frame 30.

As shown in FIGS. 1 and 4, the reduction unit 60 is installed on the drive shaft 57 of the center quill lifting unit 50 to reduce the rotational speed of the center quill lifting unit 50 to reduce the center quill 40. Allow this to be fine tuned.

The reduction unit 60 is coupled to the circumference of the drive shaft 57 and the first gear 61 and the first gear 61 which is rotated with it, the mesh of the diameter smaller than the first gear 61 is engaged with the first gear 61; The second gear 62 is engaged with the second gear 62 and is coupled to the center of the third gear 63 and the third gear 63 having a diameter smaller than that of the second gear 62 to rotate it. Consisting of an axis 64. The reduction unit 60 finely adjusts the center quill 40 by reducing the rotation speed of the drive shaft 57 through the first gear 61 to the third gear 63 when the reduction shaft 64 is rotated. do.

1 and 5, the front quill 70 is installed on one side of the upper frame 30 to be reciprocally inclined to support one side of the outer peripheral surface of the crankshaft (1).

The front quill 70 is composed of a front quill housing 71 and a work pad 72. The front quill housing 71 is inserted into the front quill hole 34 of the upper frame 30 and is elevated accordingly. The front quill housing 71 is made of alloy steel (SCM440). The work pad 72 is coupled to the upper end of the front quill housing 71 and is in close contact with the outer circumferential surface of the crankshaft 1. The work pad 72 is made of white metal to minimize the frictional force when contacting the crankshaft 1 to prevent damage to the crankshaft 1 and to maintain wear resistance.

1 and 5, the front quill lifting unit 80 is installed in the upper frame 30 and connected to the front quill 70 to transfer the front quill 70 to the setting point and the front quill 70 ) Is transferred automatically or manually. The front quill lifting portion 80, the front quill screw 81, the front quill feed block 82, spline shaft 83, clutch gear 84, gear shaft 85, the first electric gear (85a) And a second electric gear 85b, an encoder 87, a drive gear 88, and a motor 89.

The front quill screw 81 is provided in the front quill housing 71 of the front quill 70, and the coupling part 81a is formed in the lower end. The front quill conveying block 82 is fixed to the inside of the front quill housing 71 and the female thread portion 82a of the inner circumferential surface is engaged with the front quill screw 81 and the front quill housing when the front quill screw 81 rotates. It is conveyed along the axial direction of the front quill screw 81 with 71. As shown to FIG. The spline shaft 83 has a coupling groove 83a formed at one end thereof so as to be attached to and detached from the coupling portion 81a of the front quill screw 81, and the other end thereof is drawn out to the outside of the upper frame 30 and has a spline around the spline shaft 83. 83b) is formed. As for the clutch gear 84, the spline groove 84a is formed in the inner peripheral surface so that it may be engaged with the spline 83b of the spline shaft 83, and the operation flange 84b protrudes on one side of the outer peripheral surface.

The gear shaft 85 is provided in the upper frame 30 on one side of the spline shaft 83, and both ends thereof are supported by a radial cone roller bearing 86. The radial cone roller bearing 86 not only supports the rotation of the gear shaft 85 in the axial direction thereof, but also the inclined gear shaft 85 and the other parts installed therein are loaded in the axial direction of the gear shaft 85. It is suitable to support this action.

The first electric gear 85a is engaged around one side of the gear shaft 85 and is engaged with the clutch gear 84. The second electric gear 85b is coupled around the other side of the gear shaft 85 and rotates with it.

The encoder 87 is coupled to one end of the gear shaft 85 by a coupling 87a and connected to the controller 80 to signal rotation information such as the rotation speed and the amount of rotation of the gear shaft 85. To the controller 80.

The drive gear 88 is meshed with the second electric gear 85b. The motor 89 is installed in the upper frame 30, connected to the drive gear 88 by the motor shaft 89a, and connected to the controller 130, thereby being controlled.

As shown in FIGS. 1 and 6, the rear quill 90 is installed on the other side of the upper frame 30 to be reciprocally inclined to support the other side of the outer circumferential surface of the crankshaft 1.

This rear quill 90 consists of a rear quill housing 91 and the work pad 92. The rear quill housing 91 is inserted into the rear quill hole 35 of the upper frame 30 and is elevated accordingly. The rear quill housing 91 is made of alloy steel (SCM440). The work pad 92 is coupled to the upper end of the rear quill housing 91 and is in close contact with the outer circumferential surface of the crankshaft 1 to be supported. The work pad 92 is made of white metal to minimize the frictional force when contacted with the crankshaft 1 to prevent damage to the crankshaft 1 and to maintain wear resistance.

As shown in FIGS. 1 and 6, the rear quill lifting unit 100 is installed in the upper frame 30 and connected to the rear quill 90 to transfer the rear quill 90 to the setting point, and the rear quill 90 ) Is transferred automatically or manually.

The rear quill lifting unit 100 includes a rear quill screw 101, a rear quill feed block 102, a spline shaft 103, a clutch gear 104, a gear shaft 105, and a first electric gear 105a. And a second electric gear 105b, an encoder 107, a drive gear 108, and a motor 109.

The rear quill screw 101 is provided in the rear quill housing 91 of the rear quill 90, and the coupling part 101a is formed in the lower end. The rear quill transport block 102 is fixed to the inside of the rear quill housing 91 and the female threaded portion 102a of the inner circumferential surface is engaged with the rear quill screw 101, and the rear quill housing 101 rotates when the rear quill screw 101 rotates. Together with 91, it is conveyed along the axial direction of the rear quill screw 101. As shown in FIG.

The spline shaft 103 has a coupling groove 103a formed at one end thereof so as to be attached to and detached from the coupling portion 101a of the rear quill screw 101, and the other end thereof is drawn out to the outside of the upper frame 30, and the spline ( 103b) is formed. As for the clutch gear 104, the spline groove 104a is formed in the inner peripheral surface so that it may be engaged with the spline 103b of the spline shaft 103, and the operation flange 104b protrudes in one side of the outer peripheral surface.

The gear shaft 105 is provided in the upper frame 30 on one side of the spline shaft 103, and both ends thereof are supported by the radial cone roller bearing 106. The radial cone roller bearing 106 not only supports the rotation of the gear shaft 105 in its axial direction, but also allows the gear shaft 105 and the other parts installed thereon to be inclined to be loaded in the axial direction of the gear shaft 105. It is suitable to support what works.

The first electric gear 105a is engaged around one side of the gear shaft 105 and is engaged with the clutch gear 104. The second electric gear 105b is coupled around the other side of the gear shaft 105 and rotates with it.

The encoder 107 is coupled to one end of the gear shaft 105 by a coupling 107a and connected to the controller 130, and signals rotation information such as the rotation speed and the amount of rotation of the gear shaft 105. To the controller 130.

The drive gear 108 is meshed with the second electric gear 105b. The motor 109 is installed in the upper frame 30, connected to the drive gear 108 by the motor shaft 109a, and connected to the controller 130 to be controlled thereby.

The manual automatic gear changing unit 110 is installed in the front quill lifting unit 80 and the rear quill lifting unit 100, respectively, as shown in Figs. 1, 7A to 7C, and the front quill lifting unit 80 and The rear quill lifting unit 100 is automatically or manually driven. The manual automatic gear change unit 110 includes a handle block 111, an operation handle 112, a block shaft 113, a link 114, a bush fixing pin 115, and a bush 116.

The handle block 111 is provided to be rotated in the upper frame 30 on the front quill 70 and the rear quill 90, respectively. The operation handle 112 has one end coupled to the handle block 111 and rotates the handle block 111. Block shaft 113, the upper end is coupled to the center of the handle block 111 is rotated with the handle block 111 and forms the center of rotation of the handle block 111. The link 114 is provided to form a right angle with the block axis 113, one end is coupled to the lower end of the block axis 113, and the other end is rotated about the block axis 113 during the rotation of the block axis 113.

The bush fixing pin 115 is coupled to the other end of the link 114. The bush 116 is coupled to the bush fixing pin 115 and is supported on one side of the operating flanges 84b and 104b of the clutch gears 84 and 104, and the bush fixing pin 115 when the operating handle 112 rotates. The clutch gears 84 and 104 are moved along the spline 83b and 103b of the spline shaft 83 and 103 while being rotated about the block shaft 113 together with the clutch gear 84 and 104. Is engaged or separated from the first electric gears 85a and 105a of the gear shafts 85 and 105.

As shown in FIG. 1, the display unit 120 is installed at one side of the base frame 20 and connected to the front quill lifting unit 80 and the rear quill lifting unit 100 so that the front quill lifting unit 80 and The driving displacement of the rear quill lifting unit 100 is displayed numerically.

As shown in FIG. 1, the controller 130 is connected to the center quill lifting unit 50, the front quill lifting unit 80, the rear quill lifting unit 100, and the display unit 120 to control them.

The upper frame device of the dustproof opening for large crankshaft of the present invention having such a configuration is operated as follows.

First, the assembled base frame 20 and the upper frame 30 is seated on the bed 10. When the base frame 20 is seated on the bed 10, the base frame 20 is fixed to the bed 10 after being transferred to an appropriate position on the bed 10.

When the base frame 20 is fixed on the bed 10, the crankshaft 1 to be processed is seated on the upper frame 30, and the center quill lifting part 50, the front quill lifting part 80, and the rear quill The lifting pads 100 are driven respectively so that the work pads 42, 72, 92 of the center quill 40, the front quill 70, and the rear quill 90 are brought into contact with each other around the crankshaft 1. Be sure to

First, the center quill lifting unit 50 is driven by the controller 130 to raise the center quill 40. When the drive shaft 57 of the center quill lifting unit 50 is rotated, the driving gear 56 is rotated, and the electric gear 55 engaged with the center gear rotates, and the lift gear 53 engaged with the electric gear 55 is rotated. . When the lift gear 53 is rotated, the center quill screw 51 is rotated and the center quill conveying block 52 engaged therewith is lifted along the center quill screw 51, thereby raising the center quill housing 41. When the center quill housing 41 is raised, the work pad 42 at the upper end thereof is supported while being in contact with the outer circumferential surface of the crankshaft 1.

Meanwhile, as illustrated in FIG. 5, the drive shaft 57 of the center quill lifting unit 50 may be finely adjusted by the reduction unit 60. When the reduction shaft 64 of the reduction unit 60 is rotated, the third gear 63 is rotated, and the driving shaft 57 is rotated while the second gear 62 and the first gear 61 engaged therewith are rotated. Here, the diameter of the third gear 63 is smaller than the diameter of the second gear 62 and the diameter of the second gear 62 is smaller than the diameter of the first gear 61 so that the driving shaft when the reduction shaft 64 rotates ( 57 is rotated in a greatly decelerated state.

When the center quill 40 is set up through the center quill lifting unit 50 as described above, the front quill lifting unit 80 is operated so that the front quill 70 supports the crankshaft 1. When the motor 89 is driven through the controller 130, the drive gear 88 connected to the motor shaft 89a is rotated, and the second electric gear 85b coupled thereto is rotated and is driven by the second electric gear 85b. The gear shaft 85 and the first electric gear 85a are rotated. When the first electric gear 85a is rotated, the clutch gear 84 engaged thereto is rotated, the spline shaft 83 is rotated by the clutch gear 84, and the front quill screw 81 coupled to the spline shaft 83. Is rotated. When the front quill screw 81 is rotated, the front quill conveying block 82 meshed with the front quill screw 81 is raised along the front quill screw 81 and thus the front quill housing 71 is also raised. When the front quill housing 71 is raised, the work pad 72 at the upper end thereof is supported while being in contact with the outer circumferential surface of the crankshaft 1.

As such, the front quill 70 may be automatically lifted by the motor 89, but may be manually lifted by the manual automatic gear changer 110. When the operation handle 112 of the manual automatic gear change unit 110 is rotated, the handle block 111 and the block shaft 113 are rotated, and the link 114 is rotated about the block shaft 113. When the link 114 is rotated, the bushing pin 115 and the bush 116 rotate with it. Since the operation flange 84b of the clutch gear 84 protrudes on one side of the bush 116, the clutch gear 84 is pushed to one side when the bush 116 rotates. Therefore, the spline groove 84a of the clutch gear 84 slides along the spline 83b of the spline shaft 83, and the clutch gear 84 is separated from the first electric gear 85a. In this state, the spline shaft 83 is disconnected from the motor 89. Therefore, the front quill 70 can be elevated by manually rotating the spline shaft 83.

On the other hand, when the center quill 40, the front quill 70 is set up to operate the rear quill lifting unit 100 so that the rear quill 90 supports the crankshaft (1). When the motor 109 is driven through the controller 130, the drive gear 108 connected to the motor shaft 109a is rotated, and the second electric gear 105b coupled thereto is rotated and is driven by the second electric gear 105b. The gear shaft 105 and the first electric gear 105a are rotated. When the first electric gear 105a is rotated, the clutch gear 104 engaged thereto is rotated, the spline shaft 103 is rotated by the clutch gear 104, and the rear quill screw 101 is coupled to the spline shaft 103. Is rotated. When the rear quill screw 101 is rotated, the rear quill conveying block 102 meshed with the rear quill screw 101 is raised along the rear quill screw 101 and thus the rear quill housing 91 is also raised. When the rear quill housing 91 is raised, the work pad 92 at the upper end thereof is supported while being in contact with the outer circumferential surface of the crankshaft 1.

As such, the rear quill 90 may be automatically lifted by the motor 109, but may be manually lifted by the manual automatic gear change unit 110. When the operation handle 112 of the manual automatic gear change unit 110 is rotated, the handle block 111 and the block shaft 113 are rotated, and the link 114 is rotated about the block shaft 113. When the link 114 is rotated, the bushing pin 115 and the bush 116 rotate with it. Since the operating flange 104b of the clutch gear 104 protrudes from one side of the bush 116, the clutch gear 104 is pushed to one side when the bush 116 rotates. Therefore, the spline groove 104a of the clutch gear 104 slides along the spline 103b of the spline shaft 103, and the clutch gear 104 is separated from the first electric gear 105a. Therefore, the rear quill 90 can be raised and lowered by rotating the spline shaft 103 manually.

When the crankshaft 1 is supported by the center quill 40, the front quill 70, and the rear quill 90, the oil is supplied to the crankshaft 1 and processed.

This invention has the following various effects.

First, the center quill 40, the front quill 70 and the rear quill 90 are respectively coupled to the center quill housing 41 and the upper end thereof, and the work pad 42 is in contact with the outer circumferential surface of the large crankshaft 1. ), A work pad 72 coupled to the front quill housing 71 and the upper end thereof and in contact with the outer circumferential surface of the large crankshaft 1, and a rear quill housing 91 and the upper end large crankshaft 1 It consists of a work pad 92 in contact with the outer peripheral surface of the), the work pads 42, 72, 92 are made of a white metal material.

Therefore, the surface of the work pads 42, 72, 92 made of white metal is in contact with the outer circumferential surface of the crankshaft 1, so that the circumference of the crankshaft 1 and the surfaces of the work pads 42, 72, 92 are different. Even if friction is generated, the outer circumferential surface of the crankshaft 1 is not damaged, thereby improving the accuracy and lifespan of the crankshaft 1.

Second, the center quill lifting unit 50 of the present invention is provided with a reduction unit 60 to reduce the rotational speed of the center quill lifting unit 50 to fine-tune the center quill 40.

Accordingly, when the reduction shaft 64 is rotated, the third gear 63 and the second gear (3) are transferred to the drive shaft 57 through the third gear 63, the second gear 62, and the first gear 61. 62), since the deceleration is performed through the first gear 61, the drive shaft 57 can be finely rotated, and thus the center quill 40 can be finely adjusted. Therefore, since the center quill 40 can be finely adjusted, the circumference of the crankshaft 1 can be precisely supported in an optimal state.

Third, the front quill 70 and the rear quill 90 of the present invention are provided with a front quill lifting unit 80 and a rear quill lifting unit 100 so as to automatically lift them.

Therefore, the front quill 70 and the rear quill 90 are automatically lifted and lifted, so that the lifting work is very convenient and quick, and the setup time for supporting the crankshaft 1 is shortened, and the setting state is relatively accurate. Do.

Fourth, the present invention is a front quill screw 81, a rear quill screw 101 for raising and lowering the front quill 70, the rear quill 90, and spline shafts 83 and 103 for transmitting power to them. Are respectively provided, and the spline shafts 83 and 103 have coupling grooves 83a and 103a to be attached to and detached from the coupling portion 81a of the front quill screw 81 and the coupling portion 101a of the rear quill screw 101. ), And splines 83b and 103b are formed around the spline shafts 83 and 103 so as to be attached to and detached from the spline grooves 84a and 104a of the clutch gears 84 and 104. .

Accordingly, when the spline shafts 83 and 103 are pushed into the front quill screw 81 and the rear quill screw 101 side, the coupling grooves 83a and 103a of the spline shafts 83 and 103 are the front quill screw 81. And splines 83b and 103b of the spline shafts 83 and 103 are coupled to the coupling portions 81a and 101a of the rear quill screw 101 and the spline grooves 84a of the clutch gears 84 and 104. To 104a. Pulling the spline shafts 83 and 103 to the opposite sides of the front quill screw 81 and the rear quill screw 101, the coupling grooves 83a, 103a and splines 83b and 103b of the spline shafts 83 and 103 Are separated from the coupling portions 81a and 101a and the spline grooves 84a and 104a.

Therefore, the spline shafts 83 and 103 which are the core components which transmit the driving force of the motors 89 and 109 to the front quill 70 and the rear quill 90 and which are relatively injured can be easily detached. When the part is damaged, only the small spline shafts 83 and 103 can be easily detached without having to disassemble the front quill screw 81 and the rear quill screw 101.

Fifth, the encoders 87 and 107 are connected to the controller 130 at one end of the gear shafts 85 and 105 of the present invention so as to transmit rotation information of the gear shafts 85 and 105 to the controller 130. It is installed.

Therefore, by the encoders 87 and 107, rotation information such as the rotation amount, rotation angle, and rotation speed of the gear shafts 85 and 105 can be accurately measured, and the center quill lifting unit 50 and thus measured The lifting information of the rear quill lifting unit 100 may be displayed on the display unit 120 through the controller 80.

Therefore, the lift information of the center quill lifting unit 50 and the rear quill lifting unit 100 is accurately measured and displayed by the encoders 87 and 107 and the display unit 120, so that the crankshaft 1 The setup work of) can be adjusted more precisely.

Sixth, in the front quill lifting unit 80 and the rear quill lifting unit 100 of the present invention, the manual automatic gear change unit 110 so that the front quill lifting unit 80 and the rear quill raising unit 100 are automatically or manually driven. ) Are installed respectively. When the operation handle 112 of the manual automatic gear change unit 110 is rotated, the bush 116 is moved in the direction of the spline shafts 83 and 103 while the spline grooves 84a and 104a of the clutch gears 84 and 104 are rotated. ) Is moved along the splines 83b and 103b of the spline shafts 83 and 103, whereby the clutch gears 84 and 104 are engaged or separated from the first electric gears 85a and 105a.

Therefore, when the clutch gears 84 and 104 are engaged with the first electric gears 85a and 105a by the manual automatic gear change unit 110 of the present invention, the rotational power of the motors 89 and 109 is front quilled. Since it is transmitted to the screw 81 and the rear quill screw 101, it is possible to automatically drive the front quill 70 and the rear quill 90, the clutch gear 84, 104 is the first electric gear (85a) ( When it is separated from 105a, the rotational power of the motors 89 and 109 is blocked, so that the front and rear quills 70 and 90 can be driven manually by manually rotating the spline shafts 83 and 103.

Therefore, it is possible to simplify the manual driving and automatic driving conversion of the center quill lifting unit 50 and the rear quill lifting unit 100 through a very simple operation of rotating the operation handle 112 of the manual automatic gear changing unit 110. .

1 is a schematic cross-sectional view showing the dustproof for large crankshaft of the present invention.

2 is a schematic cross-sectional view showing the upper frame

Figure 3 is a schematic partial enlarged cross-sectional view showing the center quil lift portion

4 is a schematic partial enlarged cross-sectional view showing the reduction unit;

5 is a schematic partial enlarged cross-sectional view showing the front quill lifting portion;

6 is a schematic partial enlarged cross-sectional view showing the rear quill lifting portion;

7A to 7C are schematic partial enlarged cross-sectional views and a side cross-sectional view showing a manual automatic gear changing unit respectively installed at the front quill lifting unit and the rear quill lifting unit;

* Description of the symbols for the main parts of the drawings *

1: crankshaft 10: bed

20: base frame 30: upper frame

31: donation 32: fixed bolt

33: center quill hole 34: front quill hole

35: rear quill hole 36: see through

40: center quill 41: center quill housing

42,72,92: Work pad 50: Center quill lifting section

51: center quill screw 52: center quill feed block

52a, 82a, 102a: female thread part 53: lift gear

55: electric gear 57: drive shaft

60: reduction gear 61: first gear

62: second gear 63: third gear

64: reduction shaft 70: front quill

71: front quill housing 80: front quill lifting

81: front quill screw 81a, 101a: coupling portion

82: front quill feed block 83,103: spline shaft

83a, 103a: Coupling groove 83b, 103b: Spline

84,104 Clutch Gear 84b, 104b: Operating Flange

86,106: Radial Cone Roller Bearings

87,107: encoder 87a, 107a: coupling

89,109: Motor 89a, 109a: Motor shaft

90: rear quill 91: rear quill housing

100: rear quill lifting 101: rear quill screw

102: rear quill transfer block 110: manual automatic gear changing unit

112: operation handle 113: block axis

114: link 115: bushing pin

116: bush 120: display unit

130: controller

Claims (8)

Bed 10; A base frame 20 mounted on the bed 10 or installed on the upper surface of the bed 10 to be transported along the bed 10; An upper frame 30 installed on an upper surface of the base frame 20; A center quill 40 installed at the center of the upper frame 30 so as to reciprocate in a vertical direction to support a center lower portion of the outer circumferential surface of the crankshaft 1; Center quill lifting portion 50 is installed in the upper frame 30 and connected to the center quill 40 to transfer the center quill 40; A reduction unit 60 installed in the center quill lifting unit 50 to reduce the rotational speed of the center quill lifting unit 50 so that the center quill 40 is finely adjusted; A front quill 70 installed at one side of the upper frame 30 to be reciprocally transported inclined to support one side of the outer circumferential surface of the crankshaft 1; Front quill lifting portion 80 is installed in the upper frame 30 and connected to the front quill 70 to transfer the front quill 70 to the set point and the front quill 70 is automatically or manually transferred; A rear quill (90) installed on the other side of the upper frame (30) so as to be reciprocated inclined and supporting the other side of the outer circumferential surface of the crankshaft (1); A rear quill lifting unit 100 installed on the upper frame 30 and connected to the rear quill 90 to transfer the rear quill 90 to a setting point and to automatically or manually convey the rear quill 90; Manual automatic gear change unit 110 installed in the front quill lifting unit 80 and the rear quill lifting unit 100 so that the front quill lifting unit 80 and the rear quill lifting unit 100 is automatically or manually driven. ; Installed on one side of the base frame 20 and connected to the front quill lifting unit 80 and the rear quill lifting unit 100, the driving displacement of the front quill lifting unit 80 and the rear quill lifting unit 100 is numerically displayed. A display unit 120; Large-scale crank, characterized in that it comprises a; center quill lifting unit 50, front quill lifting unit 80, rear quill lifting unit 100, the display unit 120 to control them; Upper frame device of dustproof for shaft. The upper frame 30 of claim 1, A center 31 seated on the upper surface of the base frame 20 and fixed to the base frame 20 by fixing bolts 32 and formed perpendicular to the center portion and coupled to the center quill 40 is elevated. A quill hole 33, a front quill hole 34 formed to be inclined at one side and coupled to slide the front quill 70, and a rear quill hole 35 formed to be inclined at the other side and coupled to slide the rear quill 90. And, the upper frame device of the dustproof opening for large crankshaft, characterized in that formed in the lower portion of the center quill hole (33) and a see-through portion 36 that can check its interior. According to claim 1, Center quill 40, front quill 70, rear quill 90, Respectively, the work pad 42 coupled to the center quill housing 41 and the upper end thereof and in contact with the outer circumferential surface of the large crankshaft 1, and the front quill housing 71 and the large crankshaft 1 coupled to the upper end thereof. The work pad 72 is in contact with the outer circumferential surface of the rear quill housing 91 and the work pad 92 is coupled to the upper circumferential surface of the large crankshaft 1 is made of, Work pads (42) (72) (92), the upper frame device of the dustproof for large crankshaft, characterized in that made of a white metal material. The method of claim 3, wherein the center quill lifting unit 50, The center quill screw 51 provided in the center quill housing 41 and the internal thread part 52a of the inner circumferential surface of the center quill housing 41 are fixed to the center quill screw 51, and the center quill screw ( The center quill conveying block 52 which is transferred along the axial direction of the center quill screw 51 together with the center quill housing 41 at the time of rotation of the 51 and the center quill screw 51 Lift gear 53 for rotating 51, support shaft 54 provided in upper frame 30 on one side of center quill screw 51, and first engagement portion coupled around support shaft 54 55a and a second engagement portion 55b, the first gear portion 55a is engaged with the lift gear 53, and the second engagement portion of the electric gear 55 55b) drive gear 56 to drive the electric gear 55, one end is connected to the drive gear 56, the other end is a sphere protruding out of the upper frame 30 Upper frame device of the dustproof for large crankshaft, characterized in that made of a coaxial (57). 5. The drive shaft 57 according to claim 4, A first gear 61 coupled to the circumference of the drive shaft 57 and rotated therewith; a second gear 62 having a diameter smaller than that of the first gear 61 and engaged with the first gear 61; It consists of a third gear 63 of diameter smaller than the second gear 62 and a reduction shaft 64 coupled to the center of the third gear 63 and engaged with the second gear 62 to reduce it. When the shaft 64 is rotated, the reduction unit 60 is configured to finely adjust the center quill 40 by reducing the rotational speed of the drive shaft 57 through the first gear 61 to the third gear 63. Upper frame device of the dustproof for large crankshaft, characterized in that the installation. The method of claim 3, wherein the front quill lifting portion 80, The front quill screw 81 which is provided in the front quill housing 71 and the coupling part 81a is formed in the lower part, and the internal thread part 82a of the inner peripheral surface is fixed to the inside of the front quill housing 71, and the front quill screw The front quill conveying block 82 is engaged with the front quill screw 81 along with the front quill housing 71 when the front quill screw 81 rotates, and the front quill at one end. Spline shaft 83 is formed with a coupling groove (83a) to be detachable to the coupling portion (81a) of the screw 81, the other end is drawn out of the upper frame 30, the spline (83b) is formed on the periphery And a clutch gear 84 having a spline groove 84a formed on the inner circumferential surface thereof so as to be engaged with the spline 83b of the spline shaft 83, and a working flange 84b protruding from one side of the outer circumferential surface, and the spline shaft 83. It is installed on the upper frame 30 on one side and both ends are radial cone rollers. The gear shaft 85 supported by the gear 86, the first electric gear 85a coupled to one side of the gear shaft 85 and engaged with the clutch gear 84, and the gear shaft 85 The second electric gear 85b coupled to the other side of the circumference and rotated therewith, coupled to one end of the gear shaft 85 by a coupling 87a, connected to the controller 130, and connected to the gear shaft 85 Encoder (87) for transmitting the rotation information of the control unit 130 to the controller (130), a drive gear (138) engaged with the second electric gear (85b), and an upper frame (30), and the drive gear (138). The upper frame device of the large crankshaft prevention tool, characterized in that the motor shaft (89a) is connected to the controller 130 is connected to and controlled by it. The method of claim 6, the rear quill lifting unit 100, The rear quill screw 101 which is provided in the rear quill housing 91 and the coupling part 101a is formed in the lower part, and the internal threaded part 102a of the inner peripheral surface are fixed to the inside of the rear quill housing 91 are rear quill screws. A rear quill transfer block 102 engaged with the 101 and being conveyed along the axial direction of the rear quill screw 101 together with the rear quill housing 91 when the rear quill screw 101 rotates, and a rear quill at one end. Spline shaft 103 is formed with a coupling groove (103a) is detached to the coupling portion 101a of the screw 101, the other end is drawn out of the upper frame 30, the spline (103b) is formed on the periphery And a clutch gear 104 having a spline groove 104a formed on the inner circumferential surface thereof so as to be engaged with the spline 103b of the spline shaft 103, and a working flange 104b protruding from one side of the outer circumferential surface, and the spline shaft 103. It is installed on the upper frame 30 on one side and both ends of the radial cone roller bearing ( A gear shaft 105 supported by 106, a first electric gear 105a coupled to one side of the gear shaft 105 and engaged with the clutch gear 104, and a gear shaft 105 of the gear shaft 105 The second electric gear 105b coupled to the other side and rotated together with the other side is coupled to one end of the gear shaft 105 by a coupling 107a and connected to the controller 130. The encoder 107 which transmits rotation information to the controller 130, the drive gear 108 meshed with the 2nd electric gear 105b, and the upper frame 30, are provided in the drive gear 108 The upper frame device of the dustproof opening for a large crankshaft, characterized in that the motor 109 is connected by the shaft (109a) and connected to the controller 130 is controlled by this. The method of claim 7, wherein the manual automatic gear change unit 110, The handle block 111 is installed to rotate in the upper frame 30 of the front quill 70 and the rear quill 90, respectively, and one end is coupled to the handle block 111, and the handle block 111 is rotated. The operation handle 112 and the upper end is coupled to the center of the handle block 111 is rotated with the handle block 111 and the block axis 113 forming the center of rotation of the handle block 111, the block axis 113 ) And one end is coupled to the lower end of the block axis 113, and the other end is rotated about the block axis 113 when the block axis 113 rotates, and the link 114 of The bushing fixing pin 115 coupled to the other end and the bushing fixing pin 115 are supported on one side of the operation flanges 84b and 104b of the clutch gears 84 and 104 and are supported by the operation handle 112. When rotated around the block shaft 113 together with the bush fixing pin 115 during rotation, the clutch gears 84 and 104 along the splines 83b and 103b of the spline shafts 83 and 103. For the large crankshaft, characterized in that the clutch gears 84, 104 consist of a bush 116 which engages or disengages with the first electric gears 85a, 105a of the gear shafts 85, 105. Upper frame device of dustproof port.

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