JPH0324998B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission path switching device in a drum agitator of a nuclear facility.
More specifically, when radioactive waste stored in a drum is stirred and solidified in the presence of a solidifying agent, when the rotation and lifting functions of the stirring blade decrease due to the solidification of the contents, the stirring blade and This invention relates to a power transmission path switching device that quickly pulls the rotating shaft out of the drum.

B. Prior art In order to prevent radioactive contamination outside the system, radioactive waste generated at nuclear power facilities such as nuclear power plants is stored in storage containers such as drums before being transported from contaminated areas, the so-called red zone. After being filled with a solidifying agent and solidified by stirring with a suitable stirrer, the upper opening of the drum is sealed with a lid. To achieve such functionality, Red
The zone is equipped with a stirring device that can be inserted into and pulled out of the drum. When such a stirring device is operated, the viscosity of the solidifying agent introduced into the drum increases as the stirring time elapses, resulting in increased resistance to rotation and vertical movement of the stirring blades. Therefore, it is necessary to pull the stirring blades of the stirring device and its drive shaft out of the drum at an appropriate time to prevent the radioactive waste from solidifying. However, because conventional stirring devices were not equipped with an immediate lifting mechanism for the stirring blades and their drive shafts, it was difficult to follow changes in solidification conditions, and in the worst case, the stirring blades and their drive shafts The viscosity of the solidifying agent reached the permissible solidifying limit before it was drawn out of the drum, causing problems such as damage to the stirring device.

B. Objective of the Invention The main objective of the present invention is to provide a power transmission path switching device in a drum stirrer that can eliminate the above-mentioned disadvantages observed in stirring devices used in nuclear facilities. .

Another main object of the present invention is to provide a stirring blade and an immediate lifting mechanism for its rotating shaft, which can quickly respond to an increase in the viscosity of a solidifying agent in a drum.

C. Structure of the Invention The present invention provides a rotating shaft 2 with a stirring blade 1 which is arranged in a drum (not shown) so as to be able to be inserted and pulled up freely.
, a first drive motor 3 connected to the upper end of the rotating shaft, a ball screw mechanism A that supports the rotating shaft 2 in a vertically movable manner, and a first and a second drive motor 3 connected to the ball screw mechanism A. A second drive motor 4 connected via a second clutch member 27 of a clutch mechanism C having clutch members 26, 27, and a rocking lever capable of tilting the respective clutch members 26, 27 of said clutch mechanism C. and a balance mechanism B provided at each end of the manual handle 15.
When the first clutch member 26 is rotated and tilted, the first clutch member 26 is engaged and the second clutch member 27 is disengaged, and the driving force of the manual handle 15 is transferred to the ball screw mechanism through the gears 20, 21, and 23. The gist of this invention is a switching device for a power transmission path in a drum stirrer M of a nuclear power facility, which is characterized in that it is configured to rapidly pull up the rotating shaft 2 upwardly.

D. Embodiment FIG. 1 is a partially cutaway front view illustrating the overall structure of the device of the present invention, and FIG. 2 is a partially longitudinal sectional view of a balance mechanism and a clutch mechanism.

In these figures, the device of the invention is fixed to a support frame 5 and is installed in the reed zone. On the other hand, a drum (not shown), which is supplied with radioactive waste and a solidifying agent such as cement powder and water, is disposed below the apparatus of the present invention. In this embodiment, an annular support bracket 6 formed by radially arranging four stirring blades 1 is fixed to the lower end of the rotating shaft 2, and a known support bracket 6 is attached to the upper end of the rotating shaft 2. A first hydraulic motor 3 is connected to the rotary shaft 2 through a coupling mechanism 41 comprising a roller chain coupling 7, a detection plate 8, a seal flange 9, etc., and transmits rotational driving force to the rotating shaft 2. The rotating shaft 2 is connected to the connecting plate 1
0, a stand 11, a nut 12, and a ball screw 13. A second hydraulic motor 4 is connected thereto. The lower end of the ball screw 13 is supported by a thrust bearing 14 mounted on the support frame 5.

The balance mechanism B is a manually operated mechanism that switches the power transmission path from the second hydraulic motor 4 to the ball screw 13 into a driving state or a stopped state via a clutch mechanism C, and is illustrated in an enlarged manner in FIG. A first drive shaft 17 has a manual handle 15 fixed to one end and a drive side bevel gear 16 fixed to the other end, and a second drive shaft extends vertically and has a driven side bevel gear 18 fixed to one end. 19. Gear 2 loosely fitted to the lower end of the second drive shaft via roller bearing 33
0, the ball screw 1 is arranged so as to form a power transmission path with the gear 20 via the intermediate gear 21.
Gear 23 fixed to the upper end of 3, second drive shaft 1
A first clutch member 26 having a pin 25 that fits into a spiral groove 24 formed on the circumferential surface of the gear 9 and loosely fitted to the second drive shaft 19; A power transmission shaft 35 whose lower end is loosely fitted into the hole 34 via a roller bearing 36 and has a spline formed on the surface of the shaft located above the fitted part, and which engages with the spline of the power transmission shaft to form an axis. The second clutch member 27 is loosely fitted so as to be able to slide along the direction, and the circumferential grooves 28 and 29 are formed on the outer peripheral surfaces of the first clutch member 26 and the second clutch member 27. It consists of a swinging lever 30 having a distal end that fits loosely into the first clutch member 26 and second clutch member 27 in sliding engagement. The swing lever 30
is supported by a pin 32 fixed to the upper end of the support shaft 31 of the intermediate gear 21 so as to be able to oscillate in a direction parallel to the plane of the paper. are the first clutch member 26 and the second clutch member 27
Teeth 3 that mesh with teeth 37 and 38 formed on the lower surface of
9 and 40 are formed, respectively.

The operating procedure of the device of the present invention will be explained below. First, when the stirring blade 1 is inserted into the drum to give stirring action to the mixture of radioactive waste and solidifying agent, the first clutch member 26 has teeth 37 on the upper surface of the gear 20. The second clutch member 27 is formed on the lower surface of the second drive shaft 19 to take an elevated position along the axial direction of the second drive shaft 19 so as not to mesh with the formed teeth 39. The teeth 38 are positioned downward along the axial direction of the power transmission shaft 35 so as to mesh with teeth 40 formed on the upper surface of the gear 23. When the second hydraulic motor 4 is started in this state, the rotational driving force of the hydraulic motor is transmitted to the ball screw 1 which is a component of the screw mechanism A via the power transmission shaft 35 and the second clutch member 27.
3. Therefore, by rotating the second hydraulic motor 4 forward and backward at appropriate time intervals, the forward and reverse rotational movements of the ball screw 13 are controlled by the coupling mechanism via the nut 20, the stand 20, and the connecting plate 10. 41, and the stirring blade 1 repeats upward movement and downward movement together with the rotating shaft 2.
At this time, since the rotational driving force of the first hydraulic motor 3 is also transmitted to the stirring blade 1 via the rotating shaft 2 and the coupling mechanism 41, the stirring blade 1 moves up and down at a predetermined time period while moving around the rotating shaft. 2, the radioactive waste filled in a drum (not shown) is solidified by the solidification reaction of the solidification agent. When the ball screw 13 is rotating, the rotational movement of the gear 23 fixed to the upper end of the ball screw is transmitted to the gear 20 via the intermediate gear 21. However, in this state, the gear 20 holds the teeth 39 out of engagement with the teeth 37 of the first clutch member 26 due to the rise of the first clutch member 26, so that the rotational driving force of the gear 20 is reduced. is absorbed by the roller bearing 33, and the second drive shaft 19, the first
The drive shaft 17 and the manual handle 15 are held stationary.

When the solidification reaction inside the drum progresses and it is necessary to quickly pull the stirring blade 1 out of the drum,
The second hydraulic motor 4 is stopped and the manual handle 15 is
Rotate. The rotational movement of the manual handle 15 is transmitted via the first drive shaft 17 and bevel gears 16 and 18 to the second
is transmitted to the drive shaft 19 of. In this way, the relative engagement position between the spiral groove 24 formed on the circumferential surface of the second drive shaft 19 and the pin 25 changes, and the first clutch member 26 is engaged with the second drive shaft 19. The tooth 37 is brought into engagement with the tooth 39. The downward movement of the first clutch member 26 is caused by the swinging lever 30
is transmitted to the second clutch member 27 through the sliding engagement between the distal end of and the circumferential grooves 28 and 29. Therefore, the second clutch member 27 is disengaged from the gear 23 and rises along the spline of the power transmission shaft 35. Thus manual handle 15
The rotational driving force of the first clutch member 26 and the gear 2
0 and the gear 20, intermediate gear 21,
The signal is transmitted to the ball screw 13 through a gear train consisting of gears 23, causing the stirring blade 1 and rotating shaft 2 to be displaced upward. In this way, the stirring blades 1 and rotating shaft 2 rotating inside the drum are given a quick pulling action toward the top opening of the drum, so they can immediately respond to an increase in the viscosity of the solidifying agent. .

In the above embodiment, an embodiment is described in which the first hydraulic motor 3 is kept in the activated state when the stirring blade 1 and the rotating shaft 2 are pulled up, but if necessary, the first hydraulic motor 3 may be After stopping the hydraulic motor 3, it is also possible to cause the stirring blade 1 and the rotating shaft 2 to perform a lifting motion. In addition to the hydraulic motors 3 and 4, any known motor may be used as the drive motor.

E. Effects of the Invention As is clear from the above explanation, by adopting the device of the present invention, various problems caused by the delay in lifting of the stirring device observed in the filling and solidification process of radioactive waste can be prevented. can be avoided.
Therefore, the present invention can exhibit remarkable effects in improving the safety and operability of radioactive waste treatment processes.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view illustrating the overall structure of the device of the present invention, and FIG. 2 is a partially longitudinal cross-sectional view of a balance mechanism and a clutch mechanism. DESCRIPTION OF SYMBOLS 1... Stirring blade, 2... Rotating shaft, 3... First drive motor, 4... Second drive motor, A... Ball screw mechanism, C... Clutch mechanism, B... Balance mechanism, M...
Drum stirrer, 15... manual handle, 26... first clutch member, 27... second clutch member,
30... Swing lever, 20, 21, 23... Gear.

Claims (1)

[Scope of Claims] 1. A rotating shaft with stirring blades arranged in a drum so that it can be inserted into and pulled up; a first drive motor connected to the upper end of the rotating shaft; and a first drive motor that allows the rotating shaft to move vertically. a second drive motor connected to the ball screw mechanism via a second clutch member of a clutch mechanism having first and second clutch members; and a balance mechanism in which a clutch member is provided at each end of a tiltable rocking lever, and when the balance mechanism is tilted by rotation of a manual handle, the first clutch member is engaged and the second clutch member is engaged. In a drum agitator for a nuclear facility, the drum agitator for a nuclear power facility is characterized in that the driving force of the manual handle is transmitted to the ball screw mechanism through a gear train, and the rotating shaft is rapidly pulled upward. Power transmission path switching device.