JPS6169696A - Composite balancer for lifting jack group - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a compound balancing device for a lifting jack 77F.

In order to equalize the load on each jack when lifting a large number of jacks all at once, install the jacks around the circumference of the heavy object and divide the jacks into several groups. In order to equalize the burden on the individual jacks in each group, a balancing device is provided between the jacks and the lifting body.

The balancing device is shown in Figure 1 α (as shown in the lower part (adjacent (1)
The support rod or step rod (2) of the jack is fixed, and the rod extends upward from the lower pedestal through the entire upper gantry (3).This rod consists of a rod-side opening/closing device, a jack body, and a head-side opening/closing device. The assembly (4) can be advanced in stages.A balancing device (5) is installed between the assembly and the upper gantry (3) to balance the load.
As shown in the figure, the piston (7) slides inside the cylinder (6), and the downward protruding part of the piston is fixed to the upper mount (3). ) and the gantry (3). In the case shown in Figure 1, the upper gantry (3) is fixed and the lower gantry (1) is fixed.
)f, the assembly (4)
is arranged so as to mesh with the rondo (2) which is located between both horizontal stands and extends vertically above the gantry (1), and the counterbalance-A position (5
) is fixed to the upper part of the lower gantry (3), and the upper end of the piston extending upward from the cylinder is fixed to the upper part of the rond by means of a suitable adjustment means, and the rond (2) is fixed by a counterbalancing device.
The load of the assembly (4) is received through the assembly (4).

Conventionally, in order to equalize the load on each jack for lifting and lowering heavy objects, for example, 8 (
As shown in Figure 3, the hard jacks (11, 12-...18) are the -Iff of the f-small jacks (11, 12, 13), the second group of jacks (14, 15, 216), and the jacks (1
7, 18), and each group's balancing device r/
, are communicated by balance piping (19), (20), and (21), and the individual balance devices in each group receive a uniform load. The reason why the above jacks are divided into three groups is that the three-point support supports the load at each point, and by dividing the jack into three groups in this way, each During operation, the individual balancers in each group are uniformly loaded by the jack assembly (4), although the heavy loads may be different. However, when lifting and lowering a heavy object by supporting it using three groups, it is difficult to lift and lower the heavy object at the same time with a uniform load on each group, especially when lifting and lowering it horizontally, as is known as three-point support. be. In such a case, there is a mutually opposing relationship (Komeru pair's jealousy (11, 15: 12.16; 13
．． 17:14.18) is carried out by uniformly bearing the load for each pair. For this purpose, pair of jacks (31, 35) (32, 36) are required as shown in Figure 4.
The balancing device of (33, 37) (34, 38) is connected to the piping (41)
, 42, 43, and 44), by uniformly distributing the load of the pair of jacks through the pair of balancing devices. A pair of balancing devices or communication piping (41, 4) used to operate the pair of jacks in this way
Even if one of the pairs (2...) is damaged or broken, and as a result the stainless steel blonde is bent, the remaining pair can carry out the entire load maintenance. However, during operation, it is difficult to raise each pair of jacks uniformly while receiving the same F > If there is a difference in height, the load will increase or decrease for each pair.Since there is no means to receive the load evenly between the balancing devices of each pair of jacks, great care must be taken during operation. be.

The inventor of the present application proposed the above-mentioned counterbalance system for jacks with piping facing each other. The above can be achieved by providing a multi-balance piping system in which one port of the cylinder is communicated with the other port via the piston of the auxiliary hydraulic cylinder, and the other port is communicated with each other by ground piping.
This solved the problem a.

Next, one embodiment will be described with reference to FIG. 5 and the following drawings. As mentioned above, the pair of jacks (31, 35; ---)'
G balancing device (31A, 35A: 32A, 36A; 33
A, 37, 4; 34A, 38A) is a piston (31B,
35B: 32B, 36B: 33B.

37B: 348, 38B) respectively support the jack assemblies (31, 35; . , 42, 43, 44).

In the present invention, each unit piping has a unit auxiliary hydraulic cylinder (45, 46, 47, 48), which is connected to the piping (
49, 50, 51, 52), and the opposite side of the hydraulic sill from the piston communicates with each other through piping (53).

By adding the double-acting auxiliary hydraulic cylinders (45...48) between the six pairs of balancing devices as described above, the piping (41...44) of the balancing devices can cause abnormalities during operation. It is possible to automatically take countermeasures and move to the safe side.

This is explained by a balancing device t (31A).

When the load mark increases for a pair of pistons (35A)
31B, 35B) are lowered by the load, and the piping (49)
Pressure oil flows into the auxiliary cylinder 45) and pressurizes the piston as shown by the arrow to push it down. As the piston descends, pressure oil flows from the cylinder (45) through the pipe (53) to the other auxiliary cylinders (46, 47, 4) as shown by the arrow.
8), each piston is pressed from below and raised, and the oil pressure of each auxiliary cylinder is averaged in the raised state (Fig. 6). On the contrary, balancing devices (31A, 35A)
When the corresponding load decreases, the pistons (31B, 35B) rise, contrary to the previous time. Then, from the auxiliary cylinder (45), as shown by the arrow, pipe (49, 41)
) Pressure oil flows into the balancing device (31A, 35A). The amount of pressure oil that flows out is sent from the other auxiliary cylinders (46, 47, 48) to the communicating pipe (53), and is then sent to the cylinder (45) as shown by the arrow. ...48) is balanced (No. 714).

Thus, even when the load on the balancing device (31A, 35A) increases or decreases, the unit auxiliary cylinder
(45) The load from the navel is transmitted, and the change in the pressure at the 9 mouths of the cylinder (45) is immediately caused by the communication tube (53) f! :1th
Since the pressure is equalized to the unit auxiliary cylinders (46...48) of 1 m, the increased pressure 710 or decreased pressure is divided by the distribution (50, 42; 51.43; 52.44). is transmitted to the counterbalancing device, which is again subjected to a uniform load. Therefore, the balancing device for each jack always shares an equal load.

At this time, if the piping (41) is damaged, pressure oil will flow out from the piping and the oil pressure in the piping (49) flowing as shown by the arrow will become zero or extremely low, so the piston will not move into the cylinder (45).
It is pushed up to the upper end of the ζ cylinder (45
) i is from other cylinders (46...48) to W(5
3) Pressure oil flows through i as indicated by the arrow, but the other cylinders (46...48) maintain the average oil pressure and balance the balance (Figure 8).Therefore, in this case, the paired balance Device(
31, 4, 35A) are removed from operation and therefore the jack assemblies (31, 35) are also removed from the load-bearing, but the counterbalancing devices of the pairs are in communication with the other unit auxiliary cylinders (46, 47, 48). (32A, 36A: 33A, 37A: 34A,
38A) Therefore, the paired jacking bodies (32, 36; 33, 37; 34, 38) in combination with these, etc. re-share and additionally bear the load that was previously shared by the damaged system, Jyatsuki's operation'f! :continue. Therefore, the pair of counterbalancing devices may be damaged, and the pair of jacks associated with this may be damaged.
There is no need to damage the supporting iron by applying an undue burden.

Therefore, in the present invention, when the load of one pair of balancing devices increases or decreases with respect to another pair of balancing devices during operation, the load is immediately equalized between the remaining pairs of balancing devices. Since it rubs, there is no need to place an undue load on the jack when lifting or lowering heavy objects. In addition, even when a pair of balancing device systems break down, the load borne by that device system is averaged and additionally borne by the other balancing device system (thereby eliminating mechanical failures in the lifting device system). be able to.

[Brief explanation of the drawing]

Fig. 1 α and b are elevational views of the lifting jack attached to the load adjustment device in use, Fig. 2 is a plan view schematically showing the state in which the balancing device is passed through, and Fig. 5 is the balance of the present invention. Schematic elevational views of the device. Figures 6 to 8 are diagrams showing the operation of the auxiliary double-acting hydraulic cylinder. Figure 6 shows the case of increasing load, Figure 7 shows the case of decreasing load, and Figure 8 shows the case of piping. Each diagram schematically shows the state of damage. 11.12...18: Jacket 19.20.21: Piping 31.32...38: Jacket 31A, 32A...38A: Balancing device 31B, 32B
...38B: Piston 41.42.43.44: Piping 45.46.47.48: Auxiliary double-acting hydraulic cylinder 49
．． 50.51.52: Piping 53: Piping

Claims (1)

[Claims] In an elevating device consisting of a group of many pairs of jacks, each pair of unit jacks arranged at opposing points is supported for each unit via a pair of unit balancing devices connected by a unit communication pipe. , each of the unit communication pipes connecting the pair of unit balancing devices is connected to one port of each unit's auxiliary double-acting hydraulic cylinder, and the other port via the piston of the auxiliary hydraulic cylinder is connected to the other port, respectively. A complex balancing device for a group of lifting jacks connected by piping.