JPS6313919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric hoist that is electrically driven and operated and used for hoisting, suspending, and transporting various types of cargo, and in particular, it relates to an electric hoist that is electrically operated and used for hoisting, suspending, and transporting various types of cargo. It is suitable for electric hoists.

An example of a conventional electric hoist having four wire ropes as described above is shown in FIGS. 1 to 4. Figure 1 is a front view, Figure 2 is a side view, and Figure 3 is a front view.
The figure is a perspective view, and FIG. 4 is a partially vertical side view of FIG. 3. In each figure, 1 is a support frame for the winding drum 4;
2 is a hoisting motor that drives the winding drum 4; 3 is a gear case; 5 is a lifting hook; 6 is a hook block; 7 is a wire rope made of twisted wires; 8 is a switch box; and 9 is a hoist support base. ,1
0 is a trolley, 14 is an I-beam for running track, 15
indicates a push button switch. The trolley 10 includes a drive motor 11, is freely suspended from the I-beam 14 via wheels 12, 12, and the hoist support base 9 is suspended by hanging pins 13, 13. A support frame 1 of the hoisting drum 4 is fixedly supported on the hoist support base 9, and both ends of one wire rope wound around the hoisting drum 4 are fixed to both ends of the hoisting drum 4, respectively. As is clear from FIGS. 3 and 4, the central portion of the wire rope 7 is attached to the base 9 with a pin 19.
The wire ropes 7a and 7b (FIG. 3) on both sides of the fixed sheave 16 are wound around the winding drum 4, respectively. Movable sheaves 22a and 22b are suspended in an engaging manner between the parts to be rotated. Both movable sheaves 22a and 22b are pivotally supported by the hook block 6, and the upper end of the lifting hook 5 is connected and suspended to a trunnion portion 21 formed in the center of the hook block 6 via a tightening means such as a hook nut 20. has been done.

When the motor 2 is started via the switch box 8 by operating the push button switch 15, the winding drum 4 is started.
rotates and both halves 7a and 7b of the wire rope
The movable sheave 22 which is suspended from the wire ropes 7a and 7b, respectively, starts to be wound in parallel to each other from the mounting ends on both sides of the winding drum 4.
a and 22b are pulled up as one, and the lifting action of the lifting hook 5 is performed. In this case, if the fixed sheave 16 is not installed and the wire rope 7
If the parting points a and 7b are fixed at a fixed point on the hoist support board 9, the wire rope 7
Due to an imbalance in the winding state on the winding drum 4 between the a side and the 7b side and a difference in the length of the rope itself, the distance between the movable sheaves 22a and 22b from the rope fixing point is unbalanced, causing the hook block 6 to This causes an inclination with respect to the horizontal plane, making it difficult to adjust the hanging position of the hook 5 above the load to be lifted. In comparison, the fixed sheave 16 is pivotally supported at a fixed position with respect to the hoist support board 9 as in the above-mentioned conventional example, and the wire rope 7 is attached to the fixed sheave 16.
If the part between parts a and 7b is hooked, even if there is a difference in length between parts 7a and 7b of the wire rope, the axis 1 of the fixed sheave 16
8, the length of the extension on both sides is automatically adjusted in a compensatory manner, thereby reducing the imbalance in the hanging distance from the fixed sheave 16 to the movable sheaves 22a and 22b, and the resulting imbalance between the hook blocks 6 and 8. This makes it possible to prevent the lifting hook 5 from tilting.

The wire rope used in the conventional electric hoist as described above is formed as a single rope consisting of a portion 7a and a portion 7b on both sides of a fixed sheave 16, but this single wire rope 7 is generally made up of a plurality of wire ropes. Since the wires are twisted clockwise or clockwise, for example, when tension is applied in the longitudinal direction of the wire rope 7 due to the load of the lifting hook 5, the wire rope 7 is twisted in the opposite direction to the twisting direction. It generates a force (temporarily called "rotation force") that tries to rotate the Therefore, the movable sheave 22 suspended from the wire ropes 7a and 7b, respectively.
The above-mentioned "autorotation force" of the wire ropes 7a and 7b which are also in close contact with each other along approximately half of the outer circumference of a and 22b
The hook block 6, the trunnion 21, and the lifting hook 5 are rotated unstably in any of the above directions due to a clockwise or counterclockwise turning force caused by the bucket hoist. It is difficult to hang the hoist accurately at the desired position, which poses a problem in the operation of the hoist.

The present invention is aimed at solving the above-mentioned difficulties of the conventional electric hoist, and has the features described in the claims section above.The features can be further summarized as follows: Both parts 7a and 7b forming one wire rope in the conventional electric hoist described above are separated from the central part as two wire ropes 7a and 7b, and the separated ends are supported so that the mounting position can be adjusted. The key point is that a rope support is provided and that the twisting directions of both wire ropes 7a and 7b are opposite to each other.

Figures 5 to 10 show an embodiment of the present invention, with Figure 5 being a front view, Figure 6 being a side view, Figure 7 being a perspective view, Figure 8 being a front view, and Figure 9 being a side view. FIG. 10 is a color perspective view. In each figure, reference numeral 9 denotes a suspension pin 13 attached to a trolley 10 which is freely supported on a running track I-beam 14 via wheels 12, as in the conventional example shown in FIGS. 1 and 2. 17 is a hanger suspended from a hanging pin 19 horizontally pivoted to the hoist support base 9; 23 is a rope support base supported by the hanger 17 via a pivot 18; shows. The rope support base 23 is formed with box-shaped parts 24a and 24b for supporting the rope end, which extend on both sides in the horizontal direction with the support axis 18 as the midpoint, that is, in the left and right directions in FIG. Box-shaped parts 24a and 24
Movable bases 25, 25 are housed inside b so as to be slidable along the horizontal direction passing through the pivot shaft 18.
Since the movable bases 25, 25 and the configuration related thereto are common to the box-shaped parts 24a and 24b, the movable bases 25 accommodated in the common box-shaped part 24 will be described below. A cylinder 27 is screwed into the hollow part of the movable table 25 through a threaded surface 26, and a cap 2 is screwed into the upper end of the cylinder 27 through a threaded surface 28.
9 is screwed in. The wire rope 7 (7a
and 7b) is fixedly attached to the upper end of the terminal support 30 is locked. Note that the cylinder body 27, the movable base 25, and the box-shaped portion 24 are provided with through holes or grooves that allow the wire rope 7 to pass therethrough. 32 and 33 are the terminal supports 30
The wire rope 7 is interposed between the wire rope 7 and the cap 29.
This is a pair of upper and lower collars that prevent the floating movement of the robot.

An adjustment threaded rod 35 is inserted through a screw hole in an outer end plate 34 in the longitudinal direction of the box-shaped portion 24, and is attached to a bearing plate 37 fixed to the outer surface of the box-shaped portion 24 via a stand 36. A thin shaft portion 39 is rotatably fitted between the stopper portion 38 formed at the tip of the adjusting screw rod 35 and the threaded portion. With this, when adjusting the adjustment screw rod 35 by rotation, the outer end plate 3
4 and the engagement with the bearing plate 37, the box-shaped portion 25 moves in the direction toward the center of the rope support base 23, that is, in the direction toward the pivot shaft 18, or in the opposite direction. That is, the distances l and l' between the center position 18 of the rope support base 23 and the position of the end support 30 of the wire rope 7 are adjusted.

The wire rope 7 used in the present invention is not a single wire rope as in the conventional example, but two wire ropes 7a and 7b separated from each other, and the twist directions of both wire ropes 7a and 7b are opposite to each other. It is an essential requirement.
The wire ropes 7a and 7b are connected to the box-shaped portions 24a and 24 of the rope support base 23, respectively.
At b, one end of each is fixed by a terminal support 30, and the other end is connected to the winding drum through the hanging parts of movable sheaves 22a and 22b, respectively, as in the conventional example shown in FIGS. 1 to 3. The upper end of the lifting hook 5 is attached to the trunnion 21 of the hook block 6 which pivotally supports both movable sheaves 22a and 22b.
It is tightened and fixed by 0 etc. In this case, the load point is A, and the hanging points of the wire ropes 7a and 7b by the terminal supports 30 are B, B', respectively.
A straight line connecting the hanging points B and B' and the rope support board 2
If the intersection with the vertical line passing through the center of the axis 18 of 3 is C, then the positional relationship of each point A, B, B', and C is 8th.
The result will be as shown in the figure. Distance and ' correspond to l and l' in FIG. 5, respectively.

In the present invention shown in the above embodiment, as the wire ropes 7a and 7b are wound around the winding drum by rotation of the winding drum, the movable sheaves 22a, 22b, trunnion 21 and lifting hook 5 are gradually lifted up, as shown in FIG. This is similar to the case of the conventional example shown in FIG. As mentioned above, the rotational force that tends to rotate the hook 5 in the counterclockwise direction causes the hook 5 to rotate and tilt, making the lifting operation unstable. On the other hand, in the present invention, the wire ropes are made up of two wire ropes 7a and 7b that are separated from each other, and the twisting directions of both wire ropes 7a and 7b are opposite to each other, so the directions of the rotational forces due to the twisting are also opposite to each other. Therefore, the rotational tendencies exerted on the lifting hook cancel each other out, leaving only a subtracted slight rotational tendency. Furthermore, in the present invention, the suspension point B of each wire rope 7a, 7b by the terminal support 30,
Since B' can be precisely adjusted by propelling the movable base 25 in the box-shaped part 24 with the adjusting screw rod 35, the lifting hook cannot be adjusted due to the imbalance between the rotation forces caused by the twisting of both wire ropes 7a and 7b. 5
Even if the rotational inclination remains, the suspension point B or
By adjusting either or both of the distance between B' and the vertical center line of the hook 5, the imbalance in the rotational force can be corrected. For example, when the rotation force due to the twisting of the wire rope 7a is weaker than the rotation force of the wire rope 7b, the suspension point B
By adjusting the rotation of the threaded rod 35 on the side, the suspension point B is moved closer to the vertical line AC passing through the load center point A of the hook 5, that is, the vertical line AC and the wire rope 7 are moved closer to each other.
By moving so that the angle θ between part A and part AB becomes smaller, the amount of contact transmission of the rotational force of the twist of the wire rope 7a to the movable sheave 22a is increased, and the rotational force of the twist of the wire rope 7b is reduced. It is now possible to balance the contact transmission amount to the movable sheave 22b, and even if the rotational forces of the two wire ropes 7a and 7b whose twist directions are opposite to each other do not cancel each other out, the hook 5 can be adjusted until they cancel each other out.
It is possible to completely stabilize the tendency of unstable rotation and inclination.

Note that when the rotation force due to the twisting of the wire rope 7a is weaker than the rotation force of the wire rope 7b as described above, instead of bringing the terminal suspension point B closer to the central vertical line CA as described above, the terminal support of the wire rope 7b is It is clear that the adjusting threaded rod 35 on the end support side of the wire rope 7b should be adjusted so as to move the point B' away from the central vertical center line CA.

Furthermore, not only when there is an imbalance in the rotational forces of both wire ropes 7a and 7b, but also when there is an imbalance in the winding state of both wire ropes 7a and 7b in the winding drum 4 due to some reason or due to the tension of the wires. Even if an imbalance in elongation occurs, the wire rope end suspension point B or
By adjusting the position of point B', each equilibrium state can be corrected.

The terminal support 30 of each wire rope 7a or 7b described above is moved in the direction away from the central vertical line AC of the terminal suspension point B or B' by adjusting the adjusting screw rod 35, that is, in the direction in which the distance ='=l increases. When the load center point A remains stationary, one of the distances and '' will be longer than the other. However, in reality, the wire rope 7a
Since the total lengths of wire ropes 7a and 7b are equal and fixed, for example, when the end suspension point B of the wire rope 7a is moved to the left in FIG. The movable sheave 22a suspended by the free wire rope 7a, and therefore the load point A of the lifting hook 5, is pulled to the left. If the load center point A deviates from the vertical line passing through the pivot axis 18 of the rope support base 23 in this manner, the lifting operation becomes unstable and difficult.

As a countermeasure for the above-mentioned difficulty in adjusting the end suspension point B or B' of the wire rope 7a or 7b in the horizontal direction, the present invention provides a wire rope as illustrated in FIGS. 5 to 7 above. 7
The vertical position of the terminal support 30 can be adjusted by adjusting the screwing amount between the cylinder 27 that supports the terminal support 30 of a and 7b via the seat 31 and the movable base 25 into which the cylinder 27 is screwed. It is being done. For example, when the position B of the end support 30 of the wire rope 7a is moved to the left in FIG. 8 as described above, the cylinder 27 housing the end support 30 on the wire rope 7a side can be moved. By deepening the amount of screwing into the screw hole on the inner surface of the hollow part of the stand 25 and lowering the vertical height of the terminal support 30, it is possible to pull the load center point A of the lifting hook 5 to the left. It is possible to weaken the power of moreover,
If such an effect is not achieved by simply adjusting the end support 30 on the wire rope 7a side up and down, the end support 30 of the wire rope 7b on the opposite side may be
The adjustment may be made so that the cylindrical body 27 accommodating the terminal support 30 can be screwed into the movable base 25 shallowly, that is, the terminal support 30 can be lifted. As a result, a force is applied to the movable sheave 22b and the lifting hook 5, which are suspended on the wire rope 7b, to pull them toward the upper right in FIG.
This is added to the force that attempts to pull the lifting hook 5 back to the right in FIG. The load center point A, which had been drawn to the
It can be pulled back directly below the vertical line.

In the case of lifting adjustment of the terminal support 30 as described above, the collars 32 and 33 for preventing floating of the terminal support 30 shown in FIGS. 5 and 6 are used.
The above-mentioned lifting adjustment can be performed more effectively by using both or one of the above. For example, first, the cap 29 screwed into the cylindrical body 27 is removed from the cylindrical body 27, for example, the collar 33 is taken out, and the collar 33 is attached to the wire rope 7 as shown in FIG.
The cap 29 is inserted through the collar notch groove 40 in FIG. By screwing it into the upper part of the passage cylinder 27, the height of the terminal support part 30 is increased by the thickness of the collar 33 which is placed under the sheet 31.

The number of the collars 32 and 33 is not limited to two, and may be selected appropriately depending on the actual situation, such as just one or three or more. Furthermore, the degree of freedom in adjustment can be increased by making the thicknesses of the respective collars 32, 33 or other collars different from each other.

As is clear from the above description of the embodiments, the electric hoist of the present invention solves the problem of destabilization of the lifting work caused by the rotational force of the twisted wire rope in the conventional method, and improves the stability of the lifting hook. This has a remarkable effect in that it completely prevents undesired rotation, inclination, deflection, etc.

[Brief explanation of the drawing]

1 to 4 respectively show a front view, a side view, a perspective view, and a partially vertical side view of an example of a conventional electric hoist, and FIGS. 5 to 10 each show an embodiment of the electric hoist of the present invention. Front view showing,
They are a side view, a perspective view, a front view, a partial vertical sectional view, and a perspective view of a collar. 1...Support frame, 2...Hoisting motor,
3... Gear case, 4... Winding drum, 5... Lifting hook, 6... Hook block, 7... Wire rope, 8... Switch box, 9... Hoist support base, 10... Trolley, 11 ... Trolley drive motor, 12 ... Wheel, 13 ... Hanging pin, 1
4...I beam, 15...Push button switch, 1
6...Fixed sheave, 17...Hanger, 18...
Axis, 19...Pin, 20...Futsuknut, 2
1... Trunnion, 22a, 22b... Movable sheave, 23... Rope support base, 24a, 24b...
... Box-shaped part, 25 ... Movable base, 26 ... Threaded surface, 2
7... Cylindrical body, 28... Threaded surface, 29... Cap, 30... Terminal support, 31... Sheet, 3
2, 33...Color, 34...Outer end plate, 35...
Adjustment screw rod, 36...stand, 37...bearing plate, 38...stopper part, 39...thin shaft part, 4
0... Notch groove.

Claims (1)

[Claims] 1. A rope support is pivotally supported on a hoist base fixed to a hoist support, and a pair of wings are provided on both wings sandwiching a pivot point of the rope support, each having a distance from the pivot point. Adjustable rope end suspension parts are provided, and the other ends of the pair of ropes having mutually opposite twisting directions, one end of which is suspended from the pair of rope end suspension parts in a vertically adjustable manner, are respectively connected to the winding drum. A pair of pulley wheels are respectively fixed to both sides of the rope via the winding portion, and each of the pair of ropes has a pair of pulley wheels supporting a hanging hook between the end hanging portion side and the winding trunk winding portion side. An electric hoist characterized by being hung vertically. 2 A movable box whose movement position can be adjusted along the direction passing through the pivot point is placed on the base plates provided on both wings of the rope support, and the vertical position of the movable box can be adjusted from above. inserting a movable tube that engages with the movable tube, and locking a support terminal fixed to an upper end of the rope that passes through the movable tube, the movable box, and the base plate and hangs to a seat portion in the movable tube. An electric hoist according to claim 1, characterized in that the electric hoist is supported by an electric hoist.