JPH11299067A - Clamping device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When a lift cable bears the load of a pump body, it surely prevents the clamp device from slipping down due to the load of a support cable, a power cable, etc., and also converts the lift cable to the support cable. When the load of the pump body is transferred, each clamp device is surely slid upward with respect to the lift cable so that the bending of the support cable can be eliminated. SOLUTION: A support cable 6 is connected to a lift cable 1.
4, a clamping device 39 for sequentially assembling the cable 14 between the lift cable 14 and at least one of the opposing surfaces of the clamping members 26, 27 for clamping the cable 14. The wedge member 32 is arranged so that the tightening force on the cable 14 can be increased when the cable is displaced upward and the clamp force on the cable 14 can be reduced when the cable is displaced downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for hanging a pump body of an in-tank type liquefied gas pump in a barrel.
The present invention relates to a clamp device for assembling a support cable to a lift cable used for the suspension.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of an in-tank type liquefied gas pump used for an underground low-temperature tank of liquefied natural gas or the like. A pump body 5 integrally equipped with a motor is suspended and supported by a support cable 6 at a lower position inside a barrel 4 having an upper end portion fixed through and a lower end portion extended to near the tank bottom portion 3. By driving, it passes through the barrel 4 and the tank bottom 3
Liquefied gas is pumped up and discharged from the discharge port 7 on the upper side of the barrel 4.

[0003] Here, the support cable 6 is connected to a column 9 fixed to a lid 8 closing the upper end of the barrel 4 protruding above the tank roof 2 via a shackle or the like with a connection plate 10. A power cable 11 for supplying power to the motor of the pump body 5 and other accessory cables (not shown) are bundled with the support cable 6 via a small clamp 12.

[0004] Such an in-tank type liquefied gas pump 1
When laying in a low temperature tank, a pair of unwinding hoists 15 (see FIG. 5) of a jib crane 13 for maintenance work installed on the tank roof 2 is applied to the barrel 4 completed in advance. The pump body 5 is suspended by the lift cable 14. The support cable 6 and the power cable 1 attached to the support cable 6 are suspended in accordance with the suspension of the pump body 5.
1 and the like are fed into the barrel 4 while being secured manually, and the support cable 6 is sequentially assembled to the lift cable 14 via the clamp device 39.

As shown in FIG. 7, when the support cable 6 is fed to the connection plate 10 at the upper end, the support bar 16 is passed through the hole of the connection plate 10, and the support bar 16 is connected to the upper end of the barrel 4. The bridge is bridged on two pieces of wood 18 placed on the flange 17, whereby the load of the pump body 5 is lifted by the lift cable 14.
To support cable 6
In the subsequent work, the lid 8 previously shown in FIG. 6 is lifted by the jib crane 13 to connect the connection plate 10 to the column 9 via a shackle or the like, and the lift cable 14 removed from the jib crane 13 is connected to the lid body. 8, the power cable 11 and the like are set so as to pass through the lid 8, and the pump body 5 and all cables are lifted together with the lid 8 so that the support bar is lifted. 16 and the wooden piece 18 are removed, and the lid 8 is suspended from the flange 17 at the upper end of the barrel 4 and bolted.

FIGS. 8 and 9 show an example of a conventional clamp device 39 for sequentially assembling the support cable 6 to the lift cable 14 when suspending the pump body 5 in the barrel 4. FIG. A pair of holders 20 and 21 for sandwiching and holding three power cables 11 for supplying a three-phase current to the motor of the main body 5;
And a bracket member 23 provided with guide wheels 22 at both ends of the barrel 4 projecting in the diametrical direction.
5 and a lift cable 14 is provided on the opposite side of the bracket member 23 from the holder 20.
There are provided two sets of a pair of holding members 26 and 27 which can appropriately hold and hold the holding member.

Here, each of the holding members 26, 27 is made of a strip-shaped plate extending along the bracket member 23, and one of the holding members 26 is formed by the bolts 24, 25 at one end and one end in the longitudinal direction. The other holding member 27 is pivotally connected to the one bolt 24 at one longitudinal end so as to be freely rotatable.

A bolt 2 screwed to the bracket member 23 is provided at the other longitudinal end of the one holding member 26.
8 is inserted therethrough, and the other end of the other holding member 27 in the longitudinal direction can be engaged with a stopper 29 provided at an intermediate portion of the bolt 28. Further, the bolts 24, 25 , 28, a handle 30 is screwed via a nut 31 integrally provided at the center of the handle 30.

The other end of the other holding member 27 in the longitudinal direction is detached from the stopper 29 of the bolt 28 and hangs down, and the lift cable 14 is inserted into the groove formed in the one holding member 26 exposed. Then, the other holding member 27 is turned around the bolt 24 to move the other end in the longitudinal direction to a position facing the stopper 29 of the bolt 28, and the handle 30 is turned to tighten the nut 31. Then, the lift cable 14 is sandwiched between the two holding members 26 and 27 and is fixed by friction.

Here, the mounting of the support cable 6 to the lift cable 14 by the clamp device 39 prevents the clamp device 39 from slipping from an appropriate position of the lift cable 14 due to the load of the support cable 6 and the power cable 11. Therefore, it is necessary to ensure that a relatively small downward load is securely held with a predetermined tightening force, but a relatively large upward load can be slid to respond. It is necessary to keep it.

Because, as described above, the pump body 5
When the support cable 6 is sequentially assembled by the clamp device 39 to the lift cable 14 which is suspended and tensioned, it is inevitable that the support cable 6 is slightly slackened.
If the clamp device 39 does not slide upward with respect to the lift cable 14 when the load of the pump main body 5 is transferred from the support cable 6 to the support cable 6, the mutual interval between the clamp devices 39 is defined by the lift cable 14, Support cable 6 between each clamping device 39
This is because the slack is no longer eliminated, and the pump body 5 cannot be satisfactorily suspended and supported by the support cable 6.

For this reason, in the conventional clamping device 39, the nut 31 of the handle 30 is tightened so that the nut 31 of the handle 30 is tightened so that an appropriate tightening force can always be generated to the lift cable 14. 29 is set to an appropriate position so that the nut 31 is not tightened beyond the position defined by the stopper 29.

[0013]

However, the loosening of the bolts 28 provided with the stoppers 29 to the holders 20 and 21 and the change of the properties of the lift cable 14 change the tightening force on the lift cable 14. May not occur at the intended size, and the clamp device 39 may slip off from an appropriate position of the lift cable 14 due to the load of the support cable 6 or the power cable 11.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and when the lift cable bears the load of the pump body, reliably prevents the clamp device from sliding down due to the load of the support cable and the power cable. In addition, when the load of the pump body is transferred from the lift cable to the support cable, each clamp device is slid upward with respect to the lift cable so that the deflection of the support cable can be reliably eliminated. .

[0015]

SUMMARY OF THE INVENTION According to the present invention, a pump body is suspended via a lift cable inside a barrel having an upper end portion fixed to a tank roof and a lower end portion extended to near a tank bottom portion. A clamp device for sequentially assembling a support cable sent into a barrel with a lift cable, comprising a pair of clamping members for clamping the lift cable, and at least one of the opposing surfaces of the clamping members. Between the one and the lift cable, the clamping force on the lift cable can be increased when displaced upward relative to each of the holding members, and the clamp force on the lift cable can be decreased when displaced downward relative to each of the holding members. A wedge member is provided.

More specifically, at least one of the opposing surfaces of the holding members is formed with an inclined portion which gradually and upwardly projects toward the lift cable, and a gap between the inclined portion and the lift cable is formed. In addition, a plate-shaped wedge member whose thickness is gradually reduced upward is interposed so as to be slidable in the vertical direction, or at least one of the opposing surfaces of the clamping members is provided. A concave frusto-conical truncated cone that gradually decreases in diameter upwards, and a wedge member having a truncated conical truncated cone that is gradually reduced in diameter between the concave and the lift cable. It can be slidably fitted in any direction.

According to this structure, when the lift cable bears the load of the pump body, the clamp device receives a downward load on the lift cable due to the load of the support cable and the power cable, and the wedge member lifts the lift cable. The wedge member is strongly bitten between the holding member and the lift cable, thereby increasing the tightening force on the lift cable. The clamping device is securely held from slipping off the lift cable from the proper position.

On the other hand, when the load of the pump body is transferred from the lift cable to the support cable, the support cable, which has been slightly slackened, is stretched by being suspended by suspending the pump body, and each of the support cables defined by the lift cable. Since the distance between the clamp devices is increased, the clamp device receives an upward load relative to the lift cable, and the wedge member is relatively pulled down by the frictional force with the lift cable, so that the wedge member is moved relative to the holding member. The wedge member is disengaged from the holding member and the lift cable to release the bite state, thereby reducing the tightening force on the lift cable. , The support cable is reliably slid upward to eliminate the bending of the support cable.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an example of an embodiment of the present invention, and the portions denoted by the same reference numerals as those in FIGS. 8 and 9 represent the same components.

The basic configuration of this embodiment is substantially the same as that of the clamp device 39 shown in FIGS. 8 and 9 described above.
When one of the opposing surfaces of the holding members 26 and 27 for holding the lift cable 14 is opposed to the lift cable 14, the tightening force on the lift cable 14 when displaced upward with respect to the holding members 26 and 27. The difference is that the wedge member 32 is provided so that the tightening force on the lift cable 14 can be reduced when the relative displacement is increased and the relative displacement is downward. On the surface,
An inclined portion 33 that gradually projects upward toward the lift cable 14 is formed, and the inclined portion 33 and the lift cable 14 are formed.
Between them, a plate-shaped wedge member 32 whose thickness is gradually reduced upward is interposed slidably in the vertical direction.

Here, the wedge member 32 interposed between the inclined portion 33 of the holding member 26 and the lift cable 14 is used for assembling the holding members 26 and 27 to the holders 20, 21 and the bracket member 23. Bolts 24, 25, 28 (only the bolt 24 is shown in the drawing) are inserted through elongated holes 34 extending in the vertical direction, thereby allowing vertical sliding with respect to the holding members 26, 27. It is held so as not to fall off from the clamp device 39.

In this way, when the lift cable 14 bears the load of the pump body 5, the clamp device 39 receives a downward load on the lift cable 14 due to the load of the support cable 6 and the power cable 11. Since the wedge member 32 is relatively pulled up by the frictional force with the lift cable 14 and relatively displaced upward with respect to the holding member 26, the wedge member 32 is
3 and the lift cable 14 are strongly bitten, the tightening force on the lift cable 14 increases, and the clamp device 39 is securely held so as not to slide down from an appropriate position of the lift cable 14.

On the other hand, when the load of the pump main body 5 is transferred from the lift cable 14 to the support cable 6, the support cable 6, which has been slightly slackened, is stretched by being hung by the suspension of the pump main body 5, and the lift cable 1 is lifted.
4, the distance between the clamp devices 39 defined by the clamp 4 is increased, so that the clamp device 39 receives an upward load relative to the lift cable 14, and the wedge member 32 causes friction with the lift cable 14. It is relatively lowered by the force and is displaced downward relative to the holding member 26,
As a result, the wedge member 32 is withdrawn from the inclined portion 33 of the holding member 26 and between the lift cable 14 and released from the bite state, whereby the tightening force on the lift cable 14 is reduced, and the clamp device 39 is provided. Is reliably slid upward with respect to the lift cable 14, so that the bending of the support cable 6 is eliminated.

Therefore, according to the above embodiment, when the lift cable 14 bears the load of the pump body 5, it is possible to reliably prevent the clamp device 39 from sliding down due to the load of the support cable 6, the power cable 11 and the like. When the load of the pump body 5 is transferred from the lift cable 14 to the support cable 6, each clamp device 39 is surely slid upward with respect to the lift cable 14 to eliminate the deflection of the support cable 6. The pump body 5 can be satisfactorily suspended and supported by the support cable 6.

FIG. 3 and FIG. 4 show another embodiment of the present invention, in which a half-conical truncated cone having a gradually decreasing diameter is provided on the opposing surface of each of the holding members 26, 27. Formed concave portions 35, 36, and between the concave portions 35, 36 and the lift cable 14, half-frustoconical wedge members 37, 38 whose diameter gradually decreases upward are slidable in the vertical direction. In this case, the same operation and effect as those of the embodiment shown in FIGS. 1 and 2 can be obtained.

It should be noted that the clamp device of the present invention is not limited to the above-described embodiment, and that the shape of the wedge member may be other than that shown in the drawings. Of course, various changes can be made without departing from the scope.

[0028]

According to the above-described clamp device of the present invention, when the lift cable bears the load of the pump body, it is possible to reliably prevent the clamp device from slipping down due to the load of the support cable or the power cable. In addition, when the load of the pump body is transferred from the lift cable to the support cable, each clamp device can be surely slid upward with respect to the lift cable to eliminate the deflection of the support cable. Accordingly, an excellent effect that the pump body can be satisfactorily suspended and supported can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a view in the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view showing another example of the embodiment of the present invention.

FIG. 4 is a perspective view of a wedge member and a recess of FIG. 3;

FIG. 5 is an external view showing an example of an in-tank type liquefied gas pump.

6 is a detailed view of the internal structure of the barrel of FIG.

FIG. 7 is a perspective view showing a state where the pump main body is suspended.

FIG. 8 is a front view of a conventional clamp device.

9 is a view in the direction of arrows IX-IX in FIG. 8;

[Explanation of symbols]

 2 Tank roof 3 Tank bottom 4 Barrel 5 Pump body 6 Support cable 14 Lift cable 26 Clamping member 27 Clamping member 32 Wedge member 33 Inclined portion 35 Recessed portion 36 Recessed portion 37 Wedge member 38 Wedge member 39 Clamp device

Claims (3)

[Claims] 1. A support cable which is fed into a barrel together with a pump body when the pump body is suspended via a lift cable in a barrel having an upper end portion fixedly penetrated to a tank roof and a lower end portion extended to near a tank bottom portion. A clamp device for sequentially assembling the lift cable with the lift cable, comprising a pair of clamp members for clamping the lift cable, at least one of the opposing surfaces of each clamp member and the lift cable. A wedge member is provided so as to increase the tightening force on the lift cable when displaced upward relative to each of the holding members and to decrease the tightening force on the lift cable when displaced downward. Characteristic clamping device. 2. An at least one of the opposing surfaces of the clamping members is formed with an inclined portion which gradually projects upward to the lift cable side, and an upwardly extending portion is formed between the inclined portion and the lift cable. 2. The clamping device according to claim 1, wherein a plate-shaped wedge member whose thickness is gradually reduced is slidably interposed in a vertical direction. 3. A truncated-cone-shaped concave portion whose diameter is gradually reduced upward is formed in at least one of the opposing surfaces of the holding members, and an upward-facing portion is formed between the concave portion and the lift cable. 2. The clamping device according to claim 1, wherein a half-frustoconical wedge member that is gradually reduced in diameter is fitted slidably in a vertical direction.