Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
  • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
  • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
  • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
  • B66C1/34—Crane hooks

Definitions

• the present invention relates to an improvement of a lifting hook device, and more particularly, to the hook device that enables efficient lifting operation by configuring the lifting hook to be rotatable by remote control.
• FIG. 6 is a sectional structural view showing an example of a hook device in a known general lifting device.
• reference numeral 1 denotes a lifting hook (hereinafter simply referred to as a hook)
• reference numeral 2 denotes a hook block for hanging the hook 1 rotatably via a thrust bearing 3, for example.
• the hook block 2 is normally held via a holding frame 2a on a shaft 4b that supports the sieve wheel 4a.
• the hook block 2 has a structure in which the hook 1 is vertically rotatably suspended and moves up and down following the sheave block 4 including the sheave wheel 4a and the shaft 4b.
• a wire rope 5 slung on the load is engaged with the hook 1, and the load is lifted by winding up the sieve block 4 and transported to a predetermined place.
• the hook is used to lift or lift the load. Or, it will swing due to the vibration of the lifting device in the state of empty load without lifting the load.
• the movement in the vertical (thrust) direction y is naturally restrained by the thrust bearing as described above, but the structure allows a slight movement in the radial direction X. This structure allows for an economical design without making the hook block, hook, and other hook support members unnecessarily large.
• An object of the present invention is to drastically solve the above-mentioned problems of the conventional hook rotating device, and to provide a rotary hook device that enables highly accurate rotation control with a simple configuration.
• a rotary lifting hook device (hereinafter simply referred to as a hook device) according to the present invention that solves the above-mentioned problem is a remote control having a driving block at a lower end on a hook block for vertically hanging the lifting hook described above.
• An operable rotary drive unit is erected and fixed so that the drive chain wheel is located below the setting of the hook block, and a driven chain wheel is fitted around the hook at the same level as the drive wheel.
• the drive sheave and the driven sheave are provided with endless stretches. This allows the endless wheel to absorb the swing generated at the time of a suspended load or the like, so that the rotation driving device can smoothly transmit the torque to the hook.
• the rotary drive device is a geared motor, and a frequency converter can be interposed in a power supply system for the rotary drive device, thereby reducing the size of the entire device. It is possible to reduce the gear ratio of the geared motor (to approach 1).
• a driven sheave is disposed at a portion of the hook block opposite to the driven sheave with the driven sheave as a center, and the driven sheave is interposed between the driven sheave and the driven sheave. It is also possible to extend an endless chain on the hook, thereby reducing the radial load on the hook due to the tension of the endless chain generated during driving.
• the driven sheave has a larger diameter than the drive sheave and the driven sheave.
• the driven chain wheel can be movably mounted on the hook block, so that even if the endless chain is extended, the adjustment can be performed. The rotation can be smoothly transmitted to the hook.
• FIG. 1 is a side structural view showing an embodiment of a hook device according to the present invention
• FIG. 2 is a sectional view taken along line AA of FIG.
• FIG. 3 is a side view showing another embodiment of the hook device according to the present invention
• FIG. 4 is a sectional view taken along line BB of FIG.
• FIG. 5 is a partial cross-sectional view showing an embodiment of a driven chain wheel movably mounted
• FIG. 6 is a cross-sectional structural view showing a " ⁇ " example of a hook device in a known general lifting device. is there.
• FIG. 1 is a side view showing an embodiment of a hook device 10 according to the present invention
• FIG. 2 is a sectional view taken along the line AA of FIG.
• reference numeral 20 denotes a hook block for hanging the hook 1 so as to be rotatable
• reference numeral 11 denotes a rotary drive device which is fixed to the hook block 20 upright.
• the hook block 20 in the present embodiment includes a block body 20 b having the hook 1 suspended from the thrust bearing 3 and the like, a holding frame 20 a connecting the block body 20 b to the sheave block 4, and the holding frame.
• a support that is fixedly held at the lower end of the block 20a and that supports the rotary drive device 11 provided to extend from the block body 20b. 20c.
• the rotary drive device 11 has a drive wheel 12 at the lower end thereof.
• the drive wheel 12 is erected and fixed to the support frame 20 c so as to be located below the setting of the hook block 20.
• the shaft center z of the drive sheave 12 is erected so as to be parallel to the shaft center q of the hook 1
• the bracket 20 d is provided via the bracket 20 d so that the drive sheave 12 is located below the hook block 20 at a setting described later. It is fixed to the support frame 20c.
• the rotation drive device 11 has an appropriate reduction ratio at which the drive chain wheel 12 rotates at a predetermined rotation speed, and can be remotely operated from a crane operation room or an operation place such as a pendant switch. , Air motor, etc. can be used.
• a driven sheave 13 is fitted around the outer periphery of the hook 1 located at the same level as the driven sheave 12, and an endless chain 14 is stretched between the driven sheave 13 and the drive sheave 12. ing.
• the drive wheel 12 rotates, and the rotational force of the drive wheel 12 is transmitted to the driven wheel 13 via the endless chain 14 to rotate the hook 1. It can be done.
• the hook device 10 of the present invention transmits the rotational force of the drive wheel 12 to the driven wheel 13 fitted on the outer periphery of the rotatable hook 1 by the endless chain 14, and rotates the hook 1. It is characterized in that, even if the hook 1 moves in the radial direction X due to the flexibility of the endless frame 14, it can be effectively absorbed and reliably driven to rotate. .
• the positions of the drive sheave 12 and the driven sheave 13 are such that the endless chain 14 that is stretched by itself or the stretched endless chain 14 does not come into contact with the hook block 20.
• the hook 1 needs to be slightly below the lowermost surface of the hook block 20 so that the hook 1 can rotate smoothly.
• “below hook hook setting” is used in this sense.
• reference numeral 21 denotes a protective cover surrounding the drive, driven sheaves 12, 13 and the endless shaft 14, and the like
• reference numeral 22 denotes a protective cover surrounding the upper portion of the hook 1.
• Numeral 23 denotes a set screw for fixing the driven sheave 13 to the outer periphery of the hook
• 24 denotes a set screw for fixing the protective cover 22 to the block body 20b.
• a geared motor is used for the rotary drive device 11, and a frequency converter 17 is connected to a power supply system 16 for the rotary drive device 11 including a cable 16a and a control panel 16 as shown in FIG.
• the rotary drive device 11 can be relatively small and the reduction ratio can be freely selected within a large range, and the excellent effects described below can be obtained.
• an increase in the reduction ratio will inevitably increase the size of the speed reducer, leading to a fatal defect such as a large loss of head due to a large hook block as described above.
• the hook 1 cannot be rotated manually when slight control of the load is required, which greatly restricts workability.
• the reduction ratio of the geared motor having an AC motor such as an induction motor inside is made larger than necessary. Without compromising, it is possible to secure a large overall reduction ratio.
• Table 1 shows the total gears determined from the frequency converter 17 and the geared motor, and the ratio of the number of teeth between the driven and driven sheaves.
• FIG. 6 shows an example of a typical reduction ratio relationship. For example, when the rotation speed of the motor is 1800 rpm, in the embodiment of Ma 5,
• the rotation speed of the final shaft can be set to 0.9 rpm, and the hook 1 that lifts the load can be rotated safely and efficiently at an optimum speed.
• the hook 1 can be easily rotated by the human power of the operator, and the working efficiency can be significantly increased. Further, even when the overload acts on the hook 1, the hook 1 automatically rotates to a stable position, and no excessive force acts on the driven vehicle 13 ⁇ , the hook block 20 or the like.
• FIG. 3 is a side view showing an embodiment of the hook device 10a based on claims 3 and 4 of the present invention
• FIG. FIG. 4 is a sectional view taken along line BB of FIG. 3;
• a support frame 20e is provided in the opposite direction to the block body 20b of the hook block 20 as described above, and the driven wheel 15 driven by the support frame 20e is at the same level as the drive chain wheel 12 described above. It is arranged.
• the drive wheel 12 and the driven wheel 15 are disposed at positions opposed to each other with the driven wheel 13 fitted on the outer periphery of the hook 1 as a center.
• An endless chain 14 is stretched between these sheaves, that is, between the drive sheave 12 and the driven sheave 15 so as to sandwich the driven sheave 13.
• the endless chain 14 travels in an endless manner with the driven chain wheel 15 by rotating the rotation drive device 11 and rotating the drive chain wheel 12, and the driven chain meshing with the endless chain 14.
• the car 13 can be turned and the hook 1 can be turned.
• the endless wheel 14 since the endless wheel 14 is stretched between the drive chain wheel 12 and the driven wheel wheel 15 in tension, a larger amount of movement of the hook 1 in the radial direction X can be allowed.
• the driven chain wheel 15 If it is movably mounted on the hook hook 20, the endless chain 14 can be replaced very easily and effectively.
• a geared motor may be used for the rotary drive 11, and a power supply system 16 for the rotary drive 11 may be provided with a frequency converter 17 interposed. It is also possible to connect the rotary drive device 11 to the driven vehicle 15 and use a two-drive system.
• FIG. 5 shows an embodiment of the driven wheel & pinion 15 which is movably mounted.
• an elongated through-hole 20et is provided in the support frame 20e of the hook block 20.
• a fixing bolt 15 b is passed through the through-hole 20 e 1, and the bearing member 15 a that supports the driven chain wheel 15 is fixed by the fixing bolt 15 b, and the endless chain 14 is adjusted in the tension direction. It is equipped with Porto 15c.
• the present invention is not limited to this embodiment, and any structure can be arbitrarily designed and adopted as long as the driven chain wheel 15 can be freely moved in the arrangement axis w direction shown in FIG.
• a remotely operable rotary drive device having a drive chain at a lower end is fixedly mounted on a hook hook for hanging the hook rotatably, and the drive chain is connected to the hook. It is arranged so as to be located below the setting of the block, a driven wheel is fitted around the hook at the same level as the driven wheel, and a driven wheel is also provided in addition to the driven wheel.
• the chains It is constructed by stretching an endless chain on a car. It has a simple structure but has various excellent effects as described below.
• the structure is simple, the production cost is low, and the endless chains can be easily replaced and the elongation can be easily adjusted.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Load-Engaging Elements For Cranes (AREA)

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Applications Claiming Priority (4)

Publications (1)

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Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (26)

Citations (6)

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• 1989
  • 1989-10-17 JP JP1989122050U patent/JP2577694Y2/ja not_active Expired - Fee Related
• 1990
  • 1990-05-14 WO PCT/JP1990/000606 patent/WO1990014300A1/ja active Application Filing
  • 1990-05-14 CA CA002032504A patent/CA2032504C/en not_active Expired - Fee Related
  • 1990-05-14 US US07/635,640 patent/US5125707A/en not_active Expired - Fee Related

Patent Citations (6)

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