JPS5814595B2 - constant hanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a constant hanger used for supporting high-temperature equipment or piping systems in nuclear power plants, thermal power plants, chemical plants, and the like.

A constant hanger is a load attached by locking the coil spring inside the spring case in a compressed state corresponding to the set support load, and after construction is completed, this lock is released and the hanger operates as a normal hanger. .

In FIGS. 1 to 4 showing a conventional constant hanger, a rotary arm 11 is rotatably attached within a frame 1 via a main shaft 17.

Further, a spring case 8 containing a coil spring 23 is fixed to the frame 1, and a roller guide 2 fixed to the spring case 8 is attached in the axial direction inside the coil spring 23.

One end of the link plate 12 is attached to a roller 22 guided by the roller guide 2 via a roller shaft 21, and the other end of the link plate 12 is rotatably attached to the rotary arm 11.

One end of the tension bolt 25 is fixed to the roller shaft 21, and the other end of the tension bolt 25 is fixed to the end of the coil spring 23.
is fixed to a compressible spring holder 24.

Support load is the turnbuckle 16 and hanging bolt 14
and is supported by the rotating arm 11 via a load receiver 15.

3 is an upper mounting bracket for attaching the frame 1; 7 is a lock pin that is pushed through each lock hole 30 of the frame 1 and rotating arm 11 to lock the rotation of the rotating arm 11; 6 is a travel stop; 10 is a lifting lug for the spring case 8. .

13 is a travel indicator, 18 is a load adjustment bolt,
19 is a load adjustment nut, and 20 is a load index plate.

When supporting a load with this constant hanger, an initial compression load is set on the coil spring 23 according to the supported load and the amount of movement, and the lock pin 7 is inserted into the lock hole 30 in the frame 1 and the rotating arm 11. prevent rotation.

In this state, equipment and piping systems are attached to the constant hanger to support the supporting load, but after the installation work is completed and before plant operation starts, the lock pin 7 must be removed in order to operate normally against the set supporting load. No.

In this case, the lock pink can be easily removed if the actual support load is perfectly balanced with the set support load.

However, since the set support load is calculated theoretically, it is difficult to perfectly balance the difference between the actual size and weight.

Therefore, as shown in FIG. 3, when the set support load becomes overloaded, the support load is transmitted to the rotary arm 11 via the turnbuckle 16, the load suspension bolt 14, and the load receiver 15. rotates counterclockwise, and a shearing load is applied to the lock pin 7, making it impossible to remove it easily.

Furthermore, as shown in FIG. 4, if the load is too low for the set support load, the compressive force of the coil spring 23 is transmitted to the link plate 12, and the rotating arm 11 rotates clockwise around the main shaft 17. try to.

For this reason, the lock pin 7 is in a state where a shearing force is applied between the frame 1 and the rotary arm 11 in the same manner as in an overloaded state, and cannot be easily removed.

Therefore, conventionally, the lock pin 7 was removed by adjusting the turnbuckle 16 by turning it in a tightening direction or a loosening direction.

However, turning the turnbuckle 16 while supporting the support body requires a large force, and if the difference between the actual support load and the set support load is large, the turnbuckle 1
It may become impossible to turn 6.

For this reason, the support is lifted up using a chain block, etc., placed in an unloaded state, the turnbuckle 16 is adjusted, and the lock pin 7 is extracted, which requires many man-hours during extraction work and is difficult to adjust the operation. There were drawbacks.

It is an object of the present invention to provide a constant hanger which can eliminate the above-mentioned drawbacks, reduce the number of man-hours required for extracting the lock pin, shorten the unlocking work time, and facilitate readjustment during periodic inspections. A rotating arm rotatably mounted within a frame, a load supporting member connected to a part of the rotating arm, and a link plate that is slidable according to the rotation of the rotating arm. a coil spring interposed between the frame and the link plate to resiliently support the rotation of the rotary arm; and a coil spring that is compressed in advance in accordance with a preset load when the rotation arm is rotated relative to the frame. This constant hanger includes a lock pin that locks an arm and receives a load, and a jack device that allows the link plate to be displaced and driven in the axial direction of the coil spring while receiving the load.

Hereinafter, an embodiment of the constant hanger of the present invention will be described with reference to FIGS. 5 to 7, in which the same parts as those of the prior art are denoted by the same reference numerals.

A jack attachment/detachment fitting 26 is fixed to the spring case 8, and a jack 27 is attached to the jack attachment/detachment fitting 26.

One end of the load transmission jig 29 is fitted and fixed to the spindle 28 of the jack 27, and the other end of the load transmission jig 29 is screwed and fixed to the threaded part of the tension bolt 25. is forming.

This constant hanger is constructed as described above, and when the actual supporting load is overloaded with respect to the set load of the constant hanger, the jack 27 is operated in the direction in which the spindle 28 extends.

Therefore, the force exerted by the jack 27 rotates the rotary arm 11 clockwise via the spindle 28, the load transmission jig 29, the tension bolt 25, and the link plate 12, and the lock holes 30 provided in the frame 1 and the rotary arm 11 respectively rotate the rotary arm 11 clockwise. The lock pin 7 can be pulled out by aligning the two.

Furthermore, if the supporting load is too small compared to the set load, by operating the spindle 28 of the jack 27 to retract, a force will be applied in the opposite direction to the above-mentioned overload condition, and the lock pin 7 can be pulled out in the same way. can.

As described above, since the lock pin is pulled out by rotating the rotary arm using the jack device, the lock pin can be easily pulled out without requiring many man-hours as in the conventional case.

Further, readjustment can be easily performed by rotating the rotary arm in the case of relocking during periodic inspections or water pressure tests of steam piping, etc., and it is also possible to shorten the lock release work time.

In addition, this jack device can also be used when adjusting the load of a constant hanger. Normally, if it is removed and placed, only the jack attachment/detachment fitting is attached to the constant hanger, so it can be used for other hangers without getting in the way. I can do it.

8 and 9 show another embodiment, in which a jack attachment/detachment fitting 26 is fixed to the end plate 8A of the spring case 8 and the frame 1, and a jack 27 is incorporated into the jack attachment/detachment fitting 26.

Further, one end of a load transmitting jig 29 is screwed into the load receiving nut 19, and the other end of the load transmitting jig 29 is fixed to one end of the spindle 28 of the jack 27.

With this structure, when the actual support load is overloaded with respect to the set support load of the constant hanger, the jack 27 acts on the spindle 28 in the direction of the arrow, and the force by the jack 27 is applied to the spindle 28.
The load receiving nut 19 is
This acts as a force to move the spring toward the spring case 8 side.

Since the load receiving nut 19 is attached to the rotating arm 11, the rotating arm 11, which is rotatably attached to the frame 1 by the main shaft 17, tries to rotate toward the spring case 8 with the main shaft 17 as the center of rotation.

Therefore, in the loaded state, the rotating arm 11 that was rotating in the opposite direction to the spring case 8 side is pushed back, and the position of the lock pin insertion hole provided between the frame 1 and the rotating arm 11 is determined by the jack 27. It can be easily adjusted by operating it, and the lock pin 7 can be easily removed.

In addition, if the load is too low for the set load, the spindle 28 is actuated by the jack 27 in the direction opposite to the arrow in FIG. can be extracted.

As described above, the constant hanger of the present invention is
It has the effect of reducing the number of steps required to remove the lock pin to release the lock during installation, thereby shortening the time required for unlocking the lock, as well as facilitating readjustment when re-locking during periodic inspections. It is.

[Brief explanation of the drawing]

Figure 1 is a front view showing a part of a conventional constant hanger in cross section, Figure 2 is a left side view of Figure 1, and Figure 3 is a front view of a conventional constant hanger.
Figure 4 is an explanatory diagram when the supporting load of the lock pin in Figure 3 is overloaded, Figure 4 is an explanatory diagram when the lock pin in Figure 3 is underloaded, and Figure 5 is a partially cross-sectional view showing one embodiment of the constant hanger of the present invention. 6 is a cross-sectional view taken along the arrows ■-■ in FIG. 5, FIG. 7 is a right side view of the jacking device part in FIG.
The figure is a plan view showing a part of another embodiment of the constant hanger of the present invention in cross section, and FIG. 9 is a front view of FIG. 8. 1... Frame, 2... Roller guide, 7... Lock pin, 12... Link plate, 14... Load suspension bolt, 15
Load receiver, 16 Turnbuckle, 22 Roller, 23 Coil spring, 27 Jack.

Claims (1)

[Claims] 1 a rotating arm rotatably mounted within a frame; a load supporting member connected to a portion of the rotating arm;
A link plate that is slidable according to the rotation of the rotary arm, a coil spring that is interposed between the frame and the link plate and that elastically supports the rotation of the rotary arm, and a set load for the coil spring. a lock pin that locks the rotary arm relative to the frame in a pre-compressed position corresponding to the load and receives the load; and a jack device that allows the link plate to be displaced and driven in the axial direction of the coil spring while receiving the load. A constant hanger.