JPH0313521Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to a safety device for a turning device installed in a machine whose prime mover is a steam turbine.

(Technical background of the invention) In the case of a turning device that uses a pawl clutch, the lever and ring mechanism are used to forcibly and automatically disengage the stopper, but it is difficult to perform this operation reliably with a small stroke. be. In addition, lever-ring mechanisms using tension springs had large dead bands, and there was a risk of operation with insufficient engagement of the pawls.

(Purpose of the invention) The present invention is a mechanism that enables the clutch provided in the turning device to be securely inserted during the insertion operation to start the turbine, and to be able to disengage safely and reliably when the clutch is automatically disengaged. The purpose is to provide

(Summary of the invention) A spindle is connected to the rear end of a shaft with a pawl clutch that is rotationally driven by a drive device, and the spindle has a tapered part in the middle part and a spring receiver pressed by a compression spring in the end part. The trigger further has an operation knob on its end face, has a convex portion corresponding to the tapered portion of the spindle, and a pawl that engages with the spring receiver, and is constantly biased toward the engaging side of the pawl by a torsion spring. It is characterized by having the following.

And applied to claw clutch type turning device,
When automatically disengaging, the slight axial movement of the claw part when it is about to disengage is detected, and the restoring force of the compression spring reliably forcibly disengages the claw clutch, and when the clutch is engaged, the claw If the parts are not securely engaged, they will separate again,
This prevents operation under insufficient engagement.

(Embodiment of the invention) The figure shows an example in which the invention is applied to a pawl clutch type automatic release type turning device. 1 is a boss to which the sprocket 1a is attached, and 2 is a sliding key. The power of a drive machine (not shown) is transmitted to the sprocket 1a via a chain. Reference numeral 3 denotes a shaft with a pawl clutch, which has a pawl clutch 3a at its tip. 4
is a spindle, which is attached to the end of the pawl clutch shaft 3 by a connecting bolt 5. 6 is a compression spring, and 7 is a spring holder, which is fitted into the spindle 4. 8
is an operating knob fixed to the end of the spindle 4.

Reference numeral 10 denotes a torsion spring, which is provided to ensure proper movement along the trigger 9 and the tapered portion 4a of the spindle 4. Reference numeral 11 denotes a guide pin whose tip engages with a groove 11a provided in the spindle 4, and is provided to hold the spindle 4 so that it does not rotate together with the shaft 3. Further, 12 is a stopper, which is biased by a compression spring 12a.
By fitting the pawl clutch 3a into the hole 12b provided in the spindle 4 in the "disengaged" position, the spindle 4 can be locked and erroneous operation can be prevented.

Reference numeral 13 is a limit switch for engaging and releasing the pawl clutch, and the contact piece 1 is attached to the rear end of the spindle 4.
4, so that the fitting/unfitting position can be displayed.

(Operation of the invention) Now, during turning, the power transmitted by the electric motor of the drive section to the boss 1 with the sprocket via the chain is transferred to the shaft 3 with the pawl clutch by the sliding key 2.
can be conveyed to. In this state, when the driven machine is started and speeded up and the number of revolutions on the driven machine side exceeds the turning number of revolutions, the shaft 3 with the pawl clutch is pushed to the right in the figure due to the speed difference.

The movement of the shaft 3 is transmitted to the spindle 4 by means of a connecting bolt 5. The spindle 4 is provided with a tapered part 4a, and when the convex part 9a of the trigger 9 rides up on this tapered part 4a, the pawl 9b of the trigger 9 comes off from the spring receiver 7, and the compression spring 6
There is a danger that the spindle 4 and shaft 3 may be forcibly pulled out to the right in the figure above the height of the pawl 3a of the pawl clutch 3 due to the restoring force (phantom line in Figure 1), and the tips of the pawls may come into contact with each other. will definitely be avoided. The spring receiver 7 is designed to allow the spindle 4 to slide freely until the trigger 9 is released.

To "fit" the pawl clutch 3a, push the operating knob 8 and slightly turn it manually (or electrically). In a state where complete engagement is not obtained, the trigger 9 is in a state where it rests on the tapered part 4a of the spindle 4, and the claw 9b of the trigger 9 cannot be engaged with the spring receiver 7, so it becomes "disengaged" again. It does not turn under incomplete engagement of the pawl clutch 3a, and functions as a protection device for the pawl clutch 3a.

[Brief explanation of drawings]

Figure 1 shows a turning device for a machine using a steam turbine as the prime mover, in which the present invention is implemented. FIG. 2 is a detailed view of the joint between the shaft with the pawl clutch and the spindle in FIG. 1. In the figure; 1...Boss with sprocket, 1a
... Sprocket, 2 ... Slip key, 3 ... Shaft with pawl clutch, 4 ... Spindle, 4a ... Tapered part (of spindle), 5 ... Connection bolt, 6
... Compression spring, 7 ... Spring holder, 8 ... Operation knob,
9...Trigger, 9a...Protrusion (of the trigger),
9b... (trigger) claw, 10... torsion spring, 11... guide pin, 11a... (for guide pin) groove, 12... stopper, 12a... (for stopper) compression spring, 12b... ( (for stopper) hole, 13...limit switch for displaying engagement/disassembly,
14...Contact piece (of limit switch).

Claims (1)

[Scope of utility model registration request] A spindle is connected to the rear end of a shaft with a pawl clutch that is rotationally driven by a drive device, and the spindle has a tapered part in the middle part, a spring receiver pressed by a compression spring in the end part, and a spring receiver pressed by a compression spring in the end face. It has an operation knob, a convex portion corresponding to the tapered portion of the spindle, and a pawl that engages with the spring receiver, and a trigger that is always biased toward the engagement side of the pawl by a torsion spring. A safety device for a turning device of a machine powered by a steam turbine, characterized by: