JPS593105A - Turning device for rotary machine - Google Patents

Abstract

PURPOSE:To improve reliability of mesh of a motor driven pinion with a ring gear by providing a toggle mechanism for holding a stable condition beyond the dead point when a counter weight provided on a pinion carrier moves in the direction of said pinion disengaging from said ring gear. CONSTITUTION:A pin 12 is mounted on an end of a pinion carrier 7 at the counterweight 8 side in turning running wherein a pinion 6 provided on an end of the pinion carrier 7 is meshed with a ring gear 5 to transmit a drive turning force of a drive pinion 4 to the ring gear 5 for the turning running. Also, a lever 13 movably contacting this pin 12 is mounted and a toggle mechanism 15 is provided at an end of a shaft 14 for a fulcrum of the lever 13. This toggle mechanism 15 is constituted from a first lever 15a fixed to the shaft 14, a second lever 15c connected to said lever 15a by a pin 15b and swingable about a fulcrum A1 and a tension spring 15d interconnecting the other end of said lever 15c and the shaft 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides an improvement to a turning device for rotating a rotating machine such as a steam turbine at a low speed.

[Technical Background of the Invention] In general, rotating machinery such as steam turbines bends due to heat dissipation (= non-uniformity) of the rotating shaft immediately after stopping.It is necessary to prevent this bending and correct the bending of the rotating body at the time of startup.・Some 5's have an electric motor-driven turning device to enable so-called turning operation in which the rotating shaft is rotated at the order of a few revolutions per minute for the purpose of maintenance and inspection.

This turning device consists of a drive motor (a first pinion 4 driven via a reduction gear such as a twin gear or a chain, and a rotating machine that rotates a rotating machine). A second pinion 6 that meshes between the ring gear 5 and the first pinion 4 mounted on shaft number 2, and a Mlt bearing of the two pinions 4.6 are mounted and the shaft of the first pinion 4 is the center. The pinion carrier 7 is closed and swings in the shape of a dogleg, an adjustable stopper 9 that restricts the movement of the pinion carrier 7 in the direction opposite to the second pinion 6, and a cam 10 from the outside. It consists of an engagement nodule 11 that moves the second pinion 6 in the engagement direction 6 by pushing up the counterweight 8.

When performing a turning operation with the turning device number===================================================================================; By meshing the second pinion 6 at the other end with the ring gear 5 on the rotating shaft, the driving force of the motor is directly transmitted to the rotating shaft, making turning operation possible.

In the startup process of a rotating machine, the rotational speed of the rotating shaft is the driving source for the main body (in the case of a steam turbine, the turbine inlet steam)
I: Then, since there is a counterweight 8 at the other end of the pinion carrier 7, the second pinion 6 is moved in the direction of engagement, and the force of the counterweight 8 overcomes it and it completely disengages.

[Problems with background technology]

In turning operations using a turning device with such a structure, there may be cases where the required driving force of the rotating shaft is extremely small compared to the driving force of the drive motor, or where one of the counterweights 8 is not appropriate. In some cases, the vehicle often disengages during turning operations. This phenomenon inevitably occurs when an extreme imbalance occurs because the function of the turning device is maintained by an extremely delicate balance of the weight and driving force of each part.

Regarding the driving force of a motor, this type of motor generally has a ranked standard rated output, and it is not realistic to provide an appropriate output that matches the required driving force, and if such a problem occurs, Fine adjustment is not possible. In addition, the counterweight 8 cannot be finely adjusted from the outside, requiring repeated trial and error.

[Object of the Invention] The present invention rectifies the drawbacks of the turning device in the prior art, and ensures that the two time gears that should engage will surely engage even if there is some imbalance between the weight of each part and the driving force.
It is an object of the present invention to provide a highly reliable turning device that reliably disengages when it should disengage.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by providing a toggle mechanism that maintains a stable state beyond the dead point when the counterweight moves in the direction in which the second binion and ring gear separate. It is.

[Embodiment of the Invention] FIGS. 2 and 3 show an embodiment of the present invention. 1 on the counterweight 8 side of pinion carrier 7
A pin 12 is attached to the point, and a lever 13 that moves in contact with this pin 12 is attached. A shaft 14 serving as a fulcrum for this lever 13 is supported by a suitable bearing, and a toggle mechanism 15 is connected to the end of the shaft 14.

The details of the toggle machine s15 are generally as shown in FIGS. 4, 5, and 6, including a shaft 141=a first lever 15a with a concave tip that is fixed and moves together with the shaft 14; A pin 15b that faces the concave shape of the first lever 15a at point B with a slight gap, a second lever 15C with this pin 15b fixed to its tip and movable around a fulcrum A, and a second lever. It consists of a tension spring 15d that connects the other end of the spring 15c and the shaft 14. The dead point in the toggle mechanism is on the line A-A1 in FIG. 4, and FIG. 5 shows the state in which the lever 13 has climbed onto the counterweight 8 and moved in the detachment direction, and the concave shape of the first lever 15a The engagement point B between the pin 15b and the pin 15b is on the lower side of the figure from the line A-A, and therefore the toggle mechanism is in a quasi-stable state. On the other hand, FIG. 4 shows the case where the counterweight 8 moves in the direction of engagement and the lever 13 is no longer restrained by the pin 124 on the counterweight 8, and the engagement point B has passed the dead point A-A. , move 1 to 6 2 on the line. Therefore, the toggle mechanism becomes stable. In the turning device I having such a configuration, once the second pinion 6 and the ring gear 5 are engaged by the manual knob 11,
Pin 12 force ZvA − fixed to pinion carrier 7
13 is no longer restrained, the toggle mechanism 15 - the stable state number shown in FIG. Therefore, even if there is a slight problem (the lance collapses) during turning operation, it can be easily removed.
You will never have to leave again. 75 irises toggle mechanism 15
Since the tension t of the tension spring 15d is not required to be as large as that, the number of rotations of the rotating shaft increases as the original driving source continues to function, and the difference in rotational force causes the second pinion 6 to be When the toggle mechanism 15ti is moved to the first position 6 and the second position 1, the toggle mechanism 15ti returns to the state shown in FIG.

Figure 5 shows a quasi-stable state, where the forces AB are A-A,
Since the dead point on the line has been crossed to the bottom of the figure, and the pin 12 on the counterweight 8 is restraining the movement of the lever 13, the toggle mechanism 15 is activated during this time to the state shown in Figure 4 (2). There's nothing to do.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to prevent the detachment phenomenon during turning operation due to the weight of the parts constituting the turning device and the unbalance between the necessary shaft power for the drive motor, and to provide a stable and highly reliable turning device. can do.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional turning device, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is a
4 and 5 are front views showing the toggle mechanism of the present invention, and FIG. 6 is a plan view taken along the Y--Y line in FIG. 4. 4...1st pinion 5...Ring gear 6...
2nd pinion 7...Pinion carrier 8...Counterweight 9...Stopper 10...Cam 11...Manual knob 15...Toggle mechanism (7317) Agent patent attorney Kai 1j Chiaki Yu (+1 11 people) Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 β /, EC 6th illustration /, 5P

Claims (1)

[Claims] A first pinion driven by an electric motor via a reduction gear such as a gear or a chain, a second pinion that meshes with the ring gear mounted on the rotating shaft of the rotating machine and the first pinion, and this second pinion. a dogleg-shaped pinion carrier that is mounted with a second pinion and a bearing for the first pinion and swings around the first pinion shaft, and an end of the pinion carrier opposite to the second pinion From the installed counterweight and the direction of engaging the second pinion with the ring gear by pushing the counterweight upward (using two moving cams and manually operating this cam from the outside). In a turning device for a rotating machine, the direction in which the second pinion and ring gear disengage is 1 when the counterweight moves.
=, A turning device for a rotating machine characterized by being provided with a toggle mechanism that maintains a stable state beyond a dead point.