Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/28—Other constructional details
  • B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
  • B66D1/54—Safety gear
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
  • B66D3/00—Portable or mobile lifting or hauling appliances
  • B66D3/18—Power-operated hoists
  • B66D3/20—Power-operated hoists with driving motor, e.g. electric motor, and drum or barrel contained in a common housing

Definitions

• the present invention relates to equipment having an electric hoist, a crane with an electric hoist, and a rope guide.
• An electric hoist is a hoisting device for cranes that hoist and transport loads, and is equipped with an electric motor that drives a rope drum that winds up the wire rope for hoisting and lowering a suspended load.
• the wire rope wound around the rope drum is disclosed in, for example, Patent Document 1, which discloses a rope hoist in which a spiral groove of the rope drum is provided with a recess without a spiral groove in which the slider part of the rope guide mechanism rotates freely, a stop ring is provided on the guide shaft to prevent re-engagement with the spiral groove on the terminal side when the slider part rotates freely on the flat part of the rope drum, and a rope swell prevention rib is provided on the rope guide mechanism to prevent swell of the wire rope.
• Patent Document 2 discloses a rope guide mechanism for preventing the wire rope wound around the rope drum of a rope hoist from becoming unbalanced, the rope hoist comprising a first sliding member having a protrusion formed on the inner circumference thereof that screws into a spiral rope groove formed on the outer circumference of the rope drum at a constant lead angle, and having one end connection portion and other end connection portion respectively provided on one end side and the other end side in the circumferential direction, and a second sliding member having the same shape as the first sliding member and being connected to the first sliding member to form a ring-shaped ring member, the pitch of the protrusions of the first sliding member and the second sliding member being set to half the pitch of the rope groove of the rope drum, and the lead of these protrusions being set to be the same as the lead of the rope groove.
• the rope guide installed in a conventional electric hoist has a wire rope holding part and a sliding protrusion that is arranged in a spiral shape around the circumference to fit into the spiral groove of the rope drum, and the sliding protrusion fits into the spiral groove of the rope drum to guide the rope holding part.
• the wire rope holding portion and the sliding protrusions must be designed to different dimensions according to the dimensions and shape of the spiral groove, which are determined by the diameter of the rope drum and the diameter of the wire rope.
• the wide variety of rope guide types means that parts cannot be shared, and it is difficult to reduce costs, which means that the price of an electric hoist when a rope guide is installed is high, which is one of the reasons why rope guides have not become widespread.
• the present invention provides a rope guide mechanism that suppresses the bulge of the wire rope without providing a sliding protrusion on the wire rope retainer, and allows components to be shared with a simple structure, preventing the wire rope from skipping grooves or wrapping multiple times, providing an inexpensive electric hoist with a rope guide mechanism, and improving the safety of cranes with electric hoists and equipment that has rope guides.
• an electric hoist for moving a load up and down which includes a hoist frame, a rope drum that is rotatably supported by an axle on the hoist frame and driven to rotate by a drive unit and winds up the rope, and a rope guide mechanism that is parallel to the rope drum and has a rod supported by a collar on the outside of the rope wound on the rope drum, and when the hoist winds up the rope, the rod slides on the rope, preventing the rope from lifting up from the rope drum.
• the present invention has a simple structure and allows components to be shared, which prevents wire ropes from skipping grooves or wrapping multiple times, and inexpensively improves the safety of electric hoists, cranes with electric hoists, and equipment that has rope guides.
• FIG. 1 is an external perspective view of the overall configuration of an electric hoist-equipped crane according to an embodiment of the present invention
• 1 is a partially sectional perspective view of the overall configuration of an electric hoist according to an embodiment of the present invention
• FIG. 2 is a partial cross-sectional perspective view of a rope guide mechanism of a rope drum having a spiral groove according to one embodiment of the present invention.
• FIG. 1 is a partial cross-sectional perspective view of a rope guide mechanism for a rope drum without a spiral groove according to an embodiment of the present invention.
• FIG. 4 is a partial perspective view of the rope guide mechanism in FIG. 3 .
• FIG. 4 is a partial cross-sectional view of the rope guide mechanism in FIG. 3 .
• FIG. 7 is a partially enlarged cross-sectional view of the rope guide mechanism in FIG. 6 .
• FIG. 8 is an exploded view of the rope guide mechanism in FIG. 7 .
• FIG. 2 is a perspective view of a rope guide mechanism according to one embodiment of the present invention.
• FIG. 2 is a layout diagram of a rope guide mechanism according to an embodiment of the present invention.
• FIG. 2 is a partial front view of the rope guide mechanism according to one embodiment of the present invention.
• FIG. 12 is a cross-sectional view of the rope guide mechanism in FIG. 11 .
• FIG. 12 is an exploded view of the rope guide mechanism in FIG. 11 .
• Figure 1 is an external perspective view of the overall configuration of a crane with an electric hoist in one embodiment of the present invention.
• the crane saddles 20a and 20b are connected by a girder 10.
• An electric trolley 2 is installed on the girder 10 so as to be movable on the girder 10, and is provided with a saddle control unit 12 that controls crane saddles 20a, 20b.
• An electric hoist 1 for moving a load up and down is attached to the electric trolley 2, and the electric hoist 1 is provided with a crane hook 4 for suspending the load.
• the electric hoist 1 is provided with a hoist control unit 5 that controls the electric hoist 1 and the electric trolley 2, and an operation input device 3 for operating the crane with electric hoist.
• the electric hoist of the present invention is composed of an electric trolley 2, an electric hoist 1, a crane hook 4, and a hoist control unit 5.
• the hoist control unit 5 controls the movement of the electric hoist 1 and electric trolley 2 in response to the input control signal, and the load attached to the crane hook 4 can be moved in the Z direction and -Z direction or the X direction and -X direction.
• the saddle control unit 12 controls the movement of the crane saddles 20a and 20b, and the load attached to the crane hook 4 can be moved in the Y direction and -Y direction.
• Figure 2 shows an example of an electric hoist equipped with the rope guide mechanism of the present invention.
• the rope drum 37 is rotatably supported by the shaft 34 inside the hoisting machine frames 30a and 30b, and has a rope drum 37 that is rotated and driven by a driving device to wind and unwind the wire rope 36.
• an electric motor 31 and a brake 35 that is a braking mechanism for the electric motor 31 are combined and attached as a driving device for rotating the rope drum 37
• a reducer 40 that adjusts the rotation speed of the rope drum 37 is combined and attached, and the drive shaft 32 of the electric motor 31 and the driven shaft 41 of the reducer 40 are connected by a shaft coupling 33 to transmit the rotation.
• the shaft 34 that supports the rope drum 37 is connected to the final gear stage of the reducer 40, and the rope drum 37 rotates using the power of the electric motor 31. This embodiment is shown in FIG. 3 to FIG.
• the rope guide mechanism of the embodiment of the present invention shown in Figures 3 to 9 is composed of collars 52a and 52b supported at both ends of the hoist frame 30 so as to be freely rotatable by ball bearings 51a and 51b, locking fittings 54a and 54b for the ball bearings 51a and 51b attached to the outer diameter of the collars 52a and 52b, a rod 50 screwed together by threads formed on the inner diameter of the collars 52a and 52b, and locking nuts 53a and 53b that fix the position of the rod 50 to prevent the rod 50 from moving unintentionally in the direction of the central axis of the cylinder due to vibration.
• the position of the rod 50 when the wire rope 36 is in contact with the spiral groove of the rope drum 37 is arranged at a position where the distance Ld between the outer periphery of the rod 50 and the outer periphery of the wire rope 36 is less than the dimension L. Therefore, when the wire rope 36 expands and floats up from the spiral groove of the rope drum 37, the rod 50 comes into direct contact with the wire rope 36, thereby limiting the floating height dimension so that the wire rope 36 does not float up to a height where it can jump out of the spiral groove of the rope drum 37.
• the position of the rod 50 when the wire rope 36 is in contact with the outer periphery of the rope drum 37 is such that the distance Ln between the outer periphery of the rod 50 and the outer periphery of the wire rope 36 is less than the diameter of the wire rope. Therefore, when the wire rope 36 expands and floats up from the spiral groove of the rope drum 37, the rod 50 comes into direct contact with the wire rope 36, thereby limiting the floating height dimension so that the wire rope 36 does not ride up on the wire rope 36 that has already been wound.
• the rod 50 has a thread formed on its surface, which meshes with the thread formed on the inner diameter of the collars 52a and 52b, thereby fastening the rod 50 to the collars 52a and 52b.
• Collars 52a and 52b are fixed by anti-loosening nuts 53a and 53b so that the end faces of the large diameter shaft on the small diameter shaft side are pressed against the end faces of hoisting machine frames 30a and 30b, respectively.
• Anti-loosening nuts 53a and 53b prevent unintended movement of rod 50 in the direction of the cylinder's central axis due to vibration.
• the inner diameter of the collar 52 is formed with threads that mesh with the threads formed on the rod 50, and when the rod 50 and collar 52 are fastened together with the threads, the rod 50 rotates along the threads that mesh with the collar 52, creating an adjustment mechanism that allows the rod to move in the direction of the central axis.
• Ball bearings 51a and 51b are fixed to the small diameter shafts of collars 52a and 52b, respectively, and the ball bearings 51a and 51b are inserted into holes in hoist frames 30a and 30b to support rod 50 and collars 52a and 52b.
• ball bearings 51a and 51b are provided to rotate to release the pressing force caused by the rope tension so that rod 50 is not damaged by the rope tension of wire rope 36 when wire rope 36 expands and comes into contact with rod 50.
• Ball bearings 51a and 51b are positioned by anti-detachment fittings 54a and 54b to prevent collars 52a and 52b from moving in the cylindrical central axial direction.
• FIG. 8 An example of the retaining brackets 54a and 54b is shown in the partially exploded view of Figure 8.
• the retaining brackets 54a and 54b are fixed and positioned for the C-shaped retaining ring shaft by grooves provided in the collars 52a and 52b.
• the wire rope 36 is wound around the movable sheaves 42a and 42b to which the crane hook 4 is attached, and the crane hook 4 changes its center position in the height direction as the wire rope 36 is wound up and unwound onto the rope drum 37.
• the wire rope 36 is also wound around the fixed sheave 43, whose position is fixed, and the angles ⁇ and ⁇ ' of the wire rope 36 wound around the fixed sheave 43 and the movable sheaves 42a and 42b, respectively, are equal with the movable sheaves 42a and 42b at the center.
• a rod 50 according to a first embodiment of the present invention is placed near the entrance where the wire rope 36 is wound and unwound onto the rope drum 37.
• the angle ⁇ 1 is determined based on the 6 o'clock direction.
• the angle ⁇ 2 is determined based on the 6 o'clock direction. The angle ⁇ 2 is larger.
• the first rope guide mechanism is positioned at an angle of ⁇ 2 or more when the rope drum is viewed from the axial direction and based on the 6 o'clock direction, and at a position where the distance Ld between the outer periphery of the rod 50 and the outer periphery of the wire rope 36 shown in Figure 3 is less than the L dimension.
• the rope drum 37 does not have a spiral groove, it is positioned at an angle of ⁇ 2 or more and at a position where the distance Ln between the outer periphery of the rod 50 and the outer periphery of the wire rope 36 shown in Figure 4 is less than the diameter of the wire rope.
• the first rope guide mechanism suppresses the lifting of the wire rope 36, preventing the wire rope 36 from coming out of the spiral groove of the rope drum 37 and being wound around a spiral groove other than the one it was originally intended to be wound around (groove skipping), or preventing the wire rope from being wound over and over the spiral groove around which the wire rope is already wound.
• the wire rope 36 is unwound from the rope drum 37 without stopping even after the crane hook 4 touches the ground, and the unwound wire rope 36 is pushed out toward the rope drum 37 rather than toward the ground, causing the wire rope 36 to float around the entire circumference of the rope drum 37.
• rods 50 are added to the hoist frame in the direction in which the wire rope 36 is wound around the rope drum 37, in the order of 12 o'clock, 3 o'clock, and 6 o'clock when the rope drum is viewed from the axial direction.
• the wire rope 36 has a hemp core or other wire rope that is more easily bent than a steel core, it is better to increase the number of rope guide mechanisms and space them at equal intervals.
• the rope guide mechanism of the embodiment of the present invention shown in Figures 11 to 13 can be removed and installed without disassembling parts other than the rope guide mechanism when replacing parts of the rope guide mechanism of the embodiment of the present invention shown in Figures 11 to 13 by changing the rod 50, long nut 55, and locking nuts 56a and 56b of the rope guide mechanism of the embodiment of the present invention shown in Figures 3 to 10.
• the configurations of the ball bearings 51a and 51b, collars 52a and 52b, locking fittings 54a and 54b, and locking nuts 53a and 53b remain unchanged.
• rod 50 is divided into two partial rods, 50a and 50b, which are connected by screw fastening to a roughly cylindrical long nut 55 having threads on the inner surface that fit with partial rods 50a and 50b.
• the position of long nut 55 is fixed by anti-loosening nuts 56a and 56b that are attached so as to press against both end faces of long nut 55, and anti-loosening nuts 56a and 56b prevent unintended movement of long nut 55 in the direction of the cylindrical central axis due to vibration.
• the gap dimension Y between the end faces of the partial rods 50a and 50b after the rope guide mechanism is assembled is set to a length that exceeds the dimension X of the total length of the partial rod 50a protruding from the collar 52a and the collar 52a, and the total length of the partial rod 50b protruding from the collar 52b and the collar 52b.
• the collar 52b and ball bearing 51b which are integrated with the anti-detachment fitting 54b, can be easily removed.
• the rod 50 is made up of two partial rods 50a and 50b, but three or more partial rods may also be used.
• the structure of the rope guide mechanism can be simplified. Furthermore, by sharing the components among many types of rope drums regardless of the wire rope diameter and rope drum diameter, it is possible to inexpensively prevent the wire rope from skipping grooves or multiple windings, and inexpensively improve the safety of electric hoists, cranes with electric hoists, and equipment having rope guides.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)

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Publications (1)

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Citations (3)

• 2024
  • 2024-02-26 JP JP2025506663A patent/JPWO2024190384A1/ja active Pending
  • 2024-02-26 CN CN202480005437.6A patent/CN120344480A/zh active Pending
  • 2024-02-26 WO PCT/JP2024/006846 patent/WO2024190384A1/ja not_active Ceased

Patent Citations (3)

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