JPH0223476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a center hole type (hollow type) heavy object lifting device, in which a special chain is suspended in place of the conventional rod that passes through the center hole hydraulic jack. It relates to a lifting device that goes up and down.
That is, the present invention relates to a device in which a pin attachment/detachment device serving as a chucking device for the chain is provided at the upper and lower ends of a center hole hydraulic jack that passes through a suspended chain, and the upper and lower pins are alternately attached and detached between the chains to lift and lower heavy objects. Furthermore, the present invention relates to a device that can maintain the vertical position of the hydraulic jack regardless of oil leakage.

To explain the figure in detail, the center hole hydraulic jack 2 passing through the suspended chain 1 is
A guide 3 that is threadedly engaged with the center hole hydraulic jack 2 from below, a piston rod 4 that moves up and down in an oil-tight manner on the outer periphery of the guide 3, a cylinder tube 5 that the piston portion of the piston rod 4 moves up and down in an oil-tight manner, and a cylinder tube 5 that moves up and down in an oil-tight manner. In addition to the usual structure consisting of a rod cover 6 that is screwed together at the upper end, a screw 7 is carved into the hollow inner circumferential wall of the piston rod from its tip to a position corresponding to the stroke of the center hole hydraulic jack 2 itself. A hollow square pin support 9 is formed by screwing a hollow stabilizing nut 8 onto 7.
Seal with several bolts. The safety nut 8 is integrally connected with a cylindrical body 10 passing through the chain 1 on its lower surface, the lower end of the cylindrical body 10 protrudes from the lower end of the guide 3, and the outer periphery of the protruding part is machined with gears, It meshes with a gear 12 of a rotation device 11 suspended and fixed to the lower end of the guide 3. Note that 13 and 14 are bearings of the cylindrical body 10. Further, the square pin support stand 9 is connected to the hanging chain 1.
A hydraulic cylinder 16 having an upper corner pin 15 at its tip that passes between the connecting pins is arranged horizontally to form an upper pin attachment/detachment device.

A cylindrical body 17 passing through the chain is arranged on the lower end surface of the guide 3 (however, a window 18 is provided in the portion corresponding to the rotation device 11), and the lower end of the cylindrical body 17 forms a spherical surface 19. and a spherical seat 20 having a concave surface that is tiltably engaged with the spherical surface,
An adjustment screw 21 screwed onto the outer periphery of the spherical seat 20 and several or one annular piston 22 disposed on the lower surface of the spherical seat 20 allow for level adjustment with other lifting devices of the same configuration. conduct. The spherical surface 19
A hydraulic cylinder 24 having a lower corner pin 23 at its tip is arranged horizontally near the upper corner pin 15 at a position where the pitch with the chain 1 is aligned with the pitch of the chain 1, thereby forming a lower pin attaching/detaching device.

During the work, set the suspended chain 1,
The center hole hydraulic jack 2 and the cylindrical body 17 are connected and integrated with the upper and lower corner pins 15 and 23 removed, and are used as a penetration device, for example, as shown in FIG. A heavy object to be lifted or lowered is connected to the lower end of the holder 1, a device according to the present invention is fixed thereon, and the center hole hydraulic jack 2 is expanded and contracted to manually pull a chain and lift the heavy object.

That is, pressurized oil is sent to the upper hydraulic cylinder 16 to extend it, the upper corner pin 15 is inserted into the chain 1, and then the pressurized oil is sent to the oil filler port A of the center hole hydraulic jack 2 to tighten the piston rod. 4, the chain 1 rises by the stroke of the center hole hydraulic jack 2. At this time, the safety nut 8 is also rotated by the rotation of the gear 12 by the rotation device 11, so the safety nut 8 remains in its current position. After lifting the heavy object, extend the lower hydraulic cylinder 24, insert the lower corner pin 23 into the chain 1 to secure this lifting position, remove the upper corner pin 15, and supply pressure oil from the oil filler port B. Then, the piston rod 4 is retracted. At the same time, the safety nut 8 is reversely rotated by the rotating device 11.
This operation is repeated to perform the required lifting. To descend, the order of attachment and detachment of the upper and lower corner pins 15 and 23 is reversed to that described above, and the center hole hydraulic jack 2 is retracted.

The safety nut 8 is effective while the center hole hydraulic jack 2 is in operation. That is, it is used to maintain the lifting/lowering position of a heavy object for a long period of time at a desired position during the extension or contraction of the piston rod, or to maintain its current position in the event of an emergency such as a rupture of an oil pipe. In addition, the spherical surface 19
and the spherical seat 20 are for responding to the slight inclination of the chain 1, and the adjusting screw 21 and several or one annular piston 22 are similar to the lifting device according to the present invention. The purpose is to adjust the initial level of each unit when several units of equipment are installed and used. Pressure oil is sent from the oil supply port C to float the entire device, and the adjustment screw 20 is rotated to perform fine adjustment.

[1] The present invention uses a commercially available chain instead of a conventional rod, so it can be easily purchased, and the load can be changed by connecting and disconnecting the chain. Moreover, since the chain itself is flexible, the entire device does not take up much space.

[2] In addition to the upper and lower pin attachment/detachment devices, a safety nut is also used, so that any position during operation of the center hole hydraulic jack can be maintained for a long period of time.

[3] Since the safety nut is mechanically held, it will reliably hold the current position even if there is an oil leak from a valve, etc. or a break in the oil supply pipe.

[4] Since the safety nut is a built-in type, no special measures are required for construction and dustproofing compared to conventional systems.

This is a device for lifting and lowering heavy objects that has the following features.

[Brief explanation of drawings]

FIG. 1 shows an embodiment according to the present invention with its interior partially cut away, and FIG. 2 shows one mode of operation. G indicates a weight, and W indicates a heavy object to be lifted or lowered.

Claims (1)

[Claims] 1. A chain chucking device is disposed at the tip of the piston rod of a center hole hydraulic jack that penetrates the chain, and a safety nut screwed into the inner peripheral wall of the piston rod is connected to the outside of the center hole hydraulic jack via a gear. A device for lifting and lowering heavy objects, characterized in that a device for rotating the center hole hydraulic jack is attached thereto, and a device similar to the chucking device is provided at an end opposite to the chucking device, sandwiching the center hole hydraulic jack.