JPH0680380A - Horizontal position holding device of goods suspended by crane - Google Patents

Abstract

PURPOSE:To hold a suspended goods in a horizontal position by providing a liquid pressure generating means to generate the liquid pressure by suspending the suspended goods, providing a right and a left balancer tank, detecting the inclined condition of the suspended goods, and supplying the pressure liquid from the liquid pressure generating means to the balancer tank on the upward inclined side. CONSTITUTION:A device body of a horizontal position holding device A is constituted by providing a hook part 4 where a crane hook G is hooked on the center of the upper part, and providing a pair of suspending jigs H to hold the suspended goods F at each end of the lower part respectively. A hydraulic pressure generating means including a hydraulic cylinder which generates the hydraulic pressure during the upward suspending operation and is interlocked with the hook part 4 and an inclination detecting means C including a free piston 11 which detects the inclination of the suspended goods F are provided within this device body. A pressure oil switching means D including a spool valve 20 which can be switched by the hydraulic pressure supplied from a right and a left pressure chamber 10a, 10d of the inclination detecting means C is provided, and the suspended goods F is maintained in the horizontal position by pumping the switched pressure oil to the right and the left balance tank E1, E2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for maintaining a horizontal posture of a crane load during crane work, particularly when a long object is suspended.

[0002]

2. Description of the Related Art In a crane operation, particularly when suspending a long object, it is difficult and dangerous to maintain the posture of a suspended load horizontally by suspending a single sling wire. There is.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontal posture holding device for a crane load, which can safely lift a single long object load by hanging one load.

[0004]

According to the present invention, hydraulic pressure generating means for generating hydraulic pressure by suspending a suspended load, inclination detection means for detecting the inclination of the suspended load, left and right balancer tanks, Pressure fluid switching means for switching the pressure fluid from the fluid pressure generating means to the balancer tank on the upper inclination side based on a signal from the inclination detecting means.

[0005]

In the horizontal posture holding device for a crane suspended load constructed as described above, when the suspended load is tilted to the right, for example, the pressure liquid switching means receives a signal from the liquid pressure generating means based on the signal from the inclination detecting means. The pressurized liquid is sent to the balancer tank on the upper tilt side, that is, on the left side, the left side is made heavy, and the suspended load is returned to the horizontal posture.

[0006]

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

In FIGS. 1 and 2, a long horizontal posture holding device indicated by reference numeral A is suspended from a hook G of a crane by a hook portion 4 at a central portion.

By suspending a suspended load (long H-shaped steel in the illustrated example) F on the horizontal posture holding device A, for example, a hydraulic pressure generating means B for generating a hydraulic pressure and an inclination for detecting the inclination of the suspended load F. Detecting means C and left and right balancer tanks E1, E2
And the hydraulic pressure generating means B based on the signal from the inclination detecting means C.
And a pressure oil switching means D for switching the pressure oil from the above to the balun Santak E1 or E2 on the upper side.

In FIG. 3, the hydraulic pressure generating means B is composed of a hydraulic cylinder 1 provided at the center of the apparatus A in the illustrated example. A hook portion 4 is fixed to the upper end of a piston rod 3 that extends upward and is connected to the piston 2 of the hydraulic cylinder 1. An accumulator 5 connected to the upper pressure chamber 1a of the hydraulic cylinder 1 is provided, the accumulator 5 is connected to the pressure oil switching means D, and the lower pressure chamber 1b of the hydraulic cylinder 1 includes the left and right sides of the device A. The balancer tanks E1 and E2 provided at the ends are connected. Therefore, when the suspended load F is lifted by the device A via the suspenders H, H, the oil in the upper pressure chamber 1a is compressed by the piston 2 and the pressure oil is stored in the accumulator 5.

In FIG. 4, the tilt detecting means C is composed of a tilt detecting cylinder 10 and has a free piston 1 inside.
The left and right pressure chambers 10a and 10b are defined by 1. Further, the pressure oil switching means D is composed of a spool valve 20, the inlet side is connected to the accumulator 5, the outlet on the position L side is connected to the balancer tank E2 on the right side by the hydraulic circuit L1, and the position R side. Is connected to the left balancer tank E1 by a hydraulic circuit L2. The operating portion 21 on the position L side is connected to the pressure chamber 10a on the left side of the cylinder 10, and the operating portion 22 on the position R side is connected to the pressure chamber 10b on the right side. The left and right balancer tanks E1 and E2 are respectively connected to the hydraulic circuits L3 and L4.
Is connected to the lower pressure chamber 1b (FIG. 3) of the hydraulic cylinder 1.

Therefore, for example, when the suspended load F inclines to the right, the free piston 11 moves to the right, and the pressure chamber 10b on the right side becomes a positive pressure and the pressure chamber 10a on the left side becomes a negative pressure. As a result, the spool valve 20 moves to the left and is switched to the position R. As a result, the pressure oil from the accumulator 5 is sent to the left balancer tank E1 via the circuit L2. Therefore, the left balancer tank E1 becomes heavy, and the suspended load F is tilted leftward and returned to the horizontal posture. The oil in the balancer tank E1 is returned to the lower pressure chamber 1b of the hydraulic cylinder 1. A pump (not shown) may be used to return the oil in the balancer tank E1 to the lower pressure chamber 1b, or the lower pressure chamber 1b becomes a negative pressure when hoisting, and the same amount of oil is supplied from the balancer tanks E1 and E2. When the load becomes zero when the load is removed and a suspended load is placed, the piston 2
Oil may flow from the lower pressure chamber 1b to the upper pressure chamber 1a through a return passage having a check valve (not shown).

FIG. 5 shows another embodiment of the present invention, in which the inclination detecting means C and the pressure oil switching means D are integrally constituted by a spool valve 30 having weights 31 and 32 as left and right operating parts. In this example, the outlet on the position L side is connected to the balancer tank E1 by the circuit L1, and the outlet on the position R side is connected to the balancer tank E2. In this embodiment, when the suspended load F is tilted rightward, for example, the spool valve 30 is switched to the position L by the component force of the weights 31 and 32 in the axial direction, that is, the tilt direction, and the pressure oil is sent to the tank E1 so that Similarly, the suspended load F is returned to the horizontal posture, the structure is simplified, and the cost is reduced.

[0013]

Since the present invention is constructed as described above, it has the following effects.

With a single suspension, a particularly long suspended load can be horizontally and stably lifted safely.

Therefore, the dead space in the height direction of the suspended load can be reduced.

Further, it is safe even if the sling position is slightly displaced.

Further, it becomes unnecessary to perform complicated posture control by a computer or the like which is conventionally performed.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outer shape of a horizontal posture maintaining device embodying the present invention.

FIG. 2 is a control block diagram.

FIG. 3 is a front cross-sectional view illustrating the vicinity of a hydraulic pressure generating unit.

FIG. 4 is a hydraulic circuit diagram showing an embodiment of the present invention.

FIG. 5 is a hydraulic circuit diagram showing another embodiment of the present invention.

[Explanation of Codes] A ... Horizontal posture maintaining device B ... Hydraulic pressure generating means C ... Inclination detecting means D ... Pressure oil switching means E1, E2 ... Balancer tank F ... Suspended load G・ ・ ・ Hook H ・ ・ ・ Lifting tool 1 ・ ・ ・ Hydraulic cylinder 1a ・ ・ ・ Upper pressure chamber 1b ・ ・ ・ Lower pressure chamber 2 ・ ・ ・ Piston 3 ・ ・ ・ Piston rod 4 ・ ・ ・ Hook part 5 ・ ・Accumulator 10 ... Inclination detection cylinder 10a, 10b ... Pressure chamber 11 ... Free piston 20, 30 ... Spool valve 21, 22 ... Operating part 31, 32 ... Weight

Claims (1)

[Claims] 1. A hydraulic pressure generating means for generating hydraulic pressure by suspending a suspended load, an inclination detecting means for detecting an inclination of the suspended load, left and right balancer tanks, and a signal based on signals from the inclination detecting means. A horizontal posture holding device for a crane suspended load, comprising: a pressure liquid switching device for switching the pressure liquid from the liquid pressure generating device to the balancer tank on the upward tilt side.