JP2017124896A - Electric hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guide, with less resistance, a wire from a drum to right below a hoist gravity center.SOLUTION: An electric hoist comprises: a frame 3; a motor 4 attached to this frame 3; a drum 5 connected to a drive shaft 4a of this motor 4 and on which wire W can be taken up; a suspending device 6 provided above a vertical line E passing through a hoist gravity center G, and in an upper part of the frame 3; and a plurality of rollers supported by the frame 3 and guiding the wire W, drawn from the drum 5, to the lower side above the vertical line E passing through the hoist gravity center G. The plurality of rollers include: a vertical guide roller R1 that guides the wire W to above the vertical line E passing through the hoist gravity center G; a horizontal position guide roller R2 that guides the wire W to the vertical guide roller R1 along a horizontal position parallel to a drum axial center S; and orthogonal guide roller R3 that guides the wire W, drawn from the drum 5, to the horizontal position guide roller R2 along a horizontal position orthogonal to the drum axial center S.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric hoist that lifts and lowers a heavy object via a wire.

  As an electric hoist provided with an electric winch and moving a heavy object up and down via a wire, there is one described in Patent Document 1, and this electric hoist (electric hoist) connects a drum side by side to a drive shaft of a motor. An electric winch portion, a hanging hook provided on the upper side of the electric winch portion on a vertical line passing through the center of gravity of the electric winch portion in a horizontal state of an empty load, and erected below the electric winch portion A first roller that turns out a wire that is fed from the drum and has a hook for hanging at the tip thereof, and changes the direction of the wire from the first roller toward the center of gravity, and the wire from the first roller is made to coincide with a straight line passing through the center of gravity. The first and second rollers are rotating shafts, and are inserted into the rotating shaft and fixed by screws. Consists of a blanking, the sheaves are provided to be inclined by angle of inclination of the wire between the sheaves (claim 1).

Japanese Patent No. 443079

  In the prior art, the wire fed out from the drum is wound in the order of the substantially lower half of the first roller and the substantially upper half of the second roller, and coincides with the vertical line from the center of gravity (hook) of the electric winch part. Since the center of gravity of the electric winch is the same as the center of gravity for lifting and unloading the load, the hoist is always in a balanced state regardless of whether it is unloaded or unloaded. However, it is necessary to incline the front and rear, right and left of the wire diagonally between the two rollers to change the horizontal direction, and the wire is not required between the wire and the roller, particularly between the drum and the first roller. May give resistance.

An object of the present invention is to provide an electric hoist capable of solving such problems of the prior art.
An object of the present invention is to provide an electric hoist capable of guiding a wire from a drum to a position just below the center of gravity of the hoist with less resistance.

Specific means for solving the problems in the present invention are as follows.
First, the frame 3, the motor 4 attached to the frame 3, the drum 5 connected to the drive shaft 4a of the motor 4 and capable of winding the wire W, and the vertical line E passing through the hoist gravity center G. On the upper side, the suspension tool 6 provided on the upper part of the frame 3 and the wire W supported by the frame 3 and fed from the drum 5 are guided to the lower side on the vertical line E passing through the hoist gravity center G. An electric hoist having a plurality of rollers,
The plurality of rollers guides the wire W to a vertical guide roller R1 that guides the wire W on a vertical line E passing through the hoist gravity center G, and guides the wire W to a horizontal position parallel to the drum axis S to the vertical guide roller R1. It is composed of a horizontal position guide roller R2 and an orthogonal guide roller R3 for guiding the horizontal position in the direction orthogonal to the drum axis S to the wire W fed from the drum 5 to the horizontal guide roller. .

Second, the drum axis S of the drum 5 is substantially perpendicular to the vertical line E,
The orthogonal guide roller R3 is disposed at a position for guiding the wire W fed out from the outer periphery of the drum 5 substantially directly below the drum axis S,
The horizontal position guide roller R2 and the vertical guide roller R1 are disposed at positions where the wire W received from the orthogonal guide roller R3 is guided to the vertical line E substantially under the drum axis S.

Third, the orthogonal guide roller R3 has an axis R3a arranged in parallel with the drum axis S, and a cylindrical surface R3b around which the wire W is wound is formed long in the axial direction. R3b is characterized in that the diameter is gradually decreased from the axial center to both ends.
Fourthly, a wire detachment preventing member 9 for restricting the wire W from coming off from the vertical guide roller R1 and the horizontal position guide roller R2 is provided. The wire detachment prevention member 9 includes the frame 3 and the horizontal position guide roller R2. The vertical guide roller side wire detachment restricting portion 9a and the horizontal position guide roller side wire detachment restricting portion 9b are integrally formed. Features.

According to the present invention, the wire can be guided from the drum to just below the center of gravity of the hoist with less resistance.
That is, in the invention according to claim 1, the plurality of rollers for guiding the wire W fed out from the drum 5 to the lower side on the vertical line E passing through the hoist gravity center G and the vertical line passing the wire W through the hoist gravity center G are provided. E, a vertical guide roller R1 guiding up, a horizontal position guide roller R2 guiding the horizontal position of the wire W in a direction parallel to the drum axis S to the vertical guide roller R1, and the horizontal guide roller being fed from the drum 5. Since the wire W is composed of the orthogonal guide roller R3 for guiding the horizontal position in the direction orthogonal to the drum axis S, the wire W is unwound from the drum 5 and smoothly reaches the vertical line E passing through the hoist gravity center G. I can guide you.

According to the second aspect of the present invention, the wire W fed from the outer periphery of the drum 5 is guided substantially directly below the drum axis S by the orthogonal guide roller R3, and the drum shaft is formed by the horizontal position guide roller R2 and the vertical guide roller R1. Guidance can be made up to a vertical line E substantially below the center S.
According to the third aspect of the invention, when the wire W is wound around the outer periphery of the drum 5, the wire W can be smoothly guided to both ends of the drum 5 in the drum axis S direction by the cylindrical surface R 3 b of the orthogonal guide roller R 3.

  In the invention according to claim 4, the wire detachment preventing member 9 can regulate the detachment of the wire W from the vertical guide roller R1 and the horizontal position guide roller R2.

It is the front view which carried out the cross section of the flame | frame which shows embodiment of this invention. It is the side view which cut the same frame. It is the top view which cut the same frame. It is a top view which shows a wire disconnection prevention member. It is a top view which shows the modification of a wire disconnection prevention member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4, the electric hoist 1 is roughly divided into a frame 3, a motor 4 attached to the frame 3, and a drum 5 connected to a drive shaft 4 a of the motor 4 and capable of winding a wire W. And a plurality of rollers R which are supported by the frame 3 and guide the wire W fed out from the drum 5 to the lower side on the vertical line E passing through the hoist gravity center G.

  The electric hoist 1 has a hoist center of gravity G on a vertical line E passing through the approximate center in the left-right direction and the front-rear direction, and is suspended above the frame 3 above the vertical line E passing through the hoist center of gravity G. A tool (hook member) 6 is attached and can be hung on a beam or the like of a building. A load lifting tool (hook member) 10 is provided at the lower end of the wire W, and a heavy load can be hung. ing.

The frame 3 is formed by bending a metal plate material to form a gate-shaped main body 3a. A side wall 11 is detachably attached to one side of the gate-shaped main body 3a (or by welding), and the other side and lower surfaces are opened. Yes. A hanging tool 6 is bolted to the upper part of the portal body 3a.
The motor 4 is a geared motor having an electric part and a speed reduction part, the speed reduction part is bolted to a mounting base 7 on the upper part of the portal body 3a, the drive shaft 4a protrudes from the speed reduction part, and the tip thereof is a bearing. 12 is rotatably supported by the side wall 11 via 12. The drive shaft 4 a is located on the extension of the axis of the rotor of the electric part of the motor 4.

The side wall 11 is provided with a support 13 for supporting the bearing 12 and a plurality of ribs 14 for improving the strength of the side wall 11 and the mounting strength of the support 13 with respect to the side wall 11 in a radial manner around the support 13. ing.
The motor 4 is provided with a braking mechanism for restricting unintentional or inertial wire W feeding and winding operations in the speed reduction unit, and the load lifting tool 10 is excessively raised below the electric unit. A sensor 15 such as a limit switch for detecting the motor is provided, and when the sensor 15 is activated, the rotation of the motor 4 is stopped.

The drum 5 is fitted and mounted on the drive shaft 4a of the motor 4. The axis of the drive shaft 4a is the drum axis S of the drum 5, and the extension line of the drum axis S is substantially perpendicular to the vertical line E. ing. Therefore, the motor 4 and the drum 5 are arranged next to each other on the common axis.
The drum 5 has a drum portion 5a fitted to the drive shaft 4a, and flange portions 5b at both ends of the drum portion 5a. The base end of the wire W is connected, and the wire W is wound around the outer periphery of the drum portion 5a. In addition, the wire W can be fed out.

A plurality of rollers R for guiding the winding and unwinding of the wire W are supported by the frame 3 below the motor 4 and the drum 5.
The plurality of rollers R have a vertical guide roller R1, a horizontal position guide roller R2, and an orthogonal guide roller R3 sequentially arranged in the winding direction, and in the feed-out direction, the orthogonal guide roller R3, the horizontal position guide roller R2, and the vertical guide roller R3. The guide rollers are arranged in the order of R1.

The vertical guide roller R1 has a V-groove pulley shape, is rotatably supported by a roller shaft S1 supported by the frame 3, and guides the wire W onto a vertical line E passing through the hoist gravity center G.
The horizontal position guide roller R2 has a V-groove pulley shape and is rotatably supported by a roller shaft S2 supported by the frame 3, and the horizontal position of the wire W up to the vertical guide roller R1 in a direction parallel to the drum axis S. To guide you. The roller shaft S1 and the roller shaft S2 are fixed to the frame 3 so as to connect the front and rear side walls of the frame 3.

The orthogonal guide roller R3 is rotatably supported by a roller shaft S3 supported by a roller holder 16 mounted on the frame 3, and the wire W fed from the drum 5 to the horizontal position guide roller R2 is transferred to the drum axis S. Guides the horizontal position in the direction perpendicular to.
The orthogonal guide roller R3 has a shaft center R3a arranged in parallel with the drum shaft center S, and a long cylindrical surface R3b is formed between the flange portions at both ends in the direction of the shaft center R3a. The diameter gradually decreases from the center in the direction of the center R3a toward both ends.

That is, since the position of the wire W wound around the drum 5 moves between both ends of the drum portion 5a, the groove portion (cylindrical surface R3b) of the orthogonal guide roller R3 is formed in a width corresponding to the transition range. The cylindrical surface R3b has a drum shape, and makes it easy to smoothly move the hung wire W to both ends of the drum 5 in the drum axis S direction.
The plurality of rollers R are guided on a vertical line E passing through the hoist center of gravity G by winding the wire W on the tip side having the load lifting tool 10 at the lower end around the vertical guide roller R1. By being wound on the lower side of the horizontal position guide roller R2 through the upper side of the vertical guide roller R1, the position is changed in the direction away from the vertical line E in the horizontal direction, and orthogonal to the lower side of the horizontal position guide roller R2. The wire W is guided upward by reaching the guide roller R3, and from the vertical line E to the orthogonal guide roller R3, the wire W moves in a direction along the drum axis S substantially below the drum axis S, and the orthogonal guide roller The direction from R3 to the drum 5 is changed in a direction perpendicular to the drum axis S (a direction parallel to the roller axes S1 and S2 in the horizontal direction).

  When the wire W is fed out from the drum 5, the wire W wound around the outer periphery of the drum 5 is in a position shifted in the horizontal direction from the drum axis S, and is wound around the orthogonal guide roller R3 from the outer periphery of the drum 5. Guided almost directly below the drum axis S, guided by the horizontal position guide roller R2 and the vertical guide roller R1 in the direction approaching the vertical line E while being positioned almost directly below the drum axis S (horizontal position change), and guided vertically It is guided (turned) downward on the vertical line E by the roller R1.

A switch operating member 18 for operating the switch piece 15a is pivotally attached to the sensor 15 of the motor 4 so as to be swingable. The switch actuating member 18 detects that the detection piece 19 provided in the vicinity of the load lifting tool 10 at the lower end of the wire W rises with the lower portion straddling the wire W. When the load lifting tool 10 is raised excessively, the detection piece 19 pushes up the switch actuating member 18, operates the switch piece 15 a to actuate the sensor 15, and stops the winding operation of the motor 4.

1, 2, and 4, the roller holder 16 is provided with a wire detachment preventing member 9. The wire detachment preventing member 9 is formed by bending a round bar, and is positioned on both the front and rear sides of the vertical guide roller R1 and the horizontal position guide roller R2, and restricts the wire W from detaching therefrom.
The wire detachment preventing member 9 is positioned below the vertical guide roller R1, and includes a vertical guide roller side wire detachment restricting portion 9a that restricts the wire W wound around the vertical guide roller R1, and a horizontal position guide. A horizontal position guide roller side wire detachment restricting portion 9b that restricts the detachment of the wire W wound around the horizontal position guide roller R2 is formed integrally with the roller R2.

FIG. 5 shows a modification of the wire detachment preventing member 9, and this wire detachment preventing member 9 is composed of two restriction plates 20 fixed to the roller shaft S 1 and the roller shaft S 2. The two restricting plates 20 are located close to the flange portions of the vertical guide roller R1 and the horizontal position guide roller R2, have a large area covering the two flange portions, and prevent the detachment of the wire W from each flange portion. .
A peripheral portion of the two restricting plates 20 around the vertical guide roller R1 serves as a vertical guide roller side wire detachment restricting portion 9a, and a peripheral portion of the horizontal position guide roller R2 serves as a horizontal position guide roller side wire detachment restricting portion 9b.

In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the vertical guide roller R1 may be disposed at the same height as or lower than the horizontal position guide roller R2, or the roller shaft S1 and the roller shaft S2 may be rotatably mounted on the frame 3.

The orthogonal guide roller R3 has a cylindrical surface R3b formed in a drum shape, but may have a straight shape with the same overall length, and the groove width is the same as that of the horizontal position guide roller R2 and the vertical guide roller R1. Alternatively, the roller holder 16 may be rotatably mounted on the frame 3 by providing an axis parallel to the roller axes S1 and S2.
The wire detachment preventing member 9 may be attached to the rear side wall or the front side wall of the frame 3 separately from the roller holder 16.

DESCRIPTION OF SYMBOLS 1 Electric hoist 3 Frame 4 Motor 4a Drive shaft 5 Drum 5a Drum part 6 Hanging tool 9 Wire removal prevention member 9a Vertical guide roller side wire removal restriction part 9b Horizontal position guide roller side wire removal restriction part 10 Loading tool 11 Side wall 12 Bearing 13 Support 16 Roller holder 18 Switch actuating member E Vertical line G Hoist center of gravity R Roller R1 Vertical guide roller R2 Horizontal position guide roller R3 Orthogonal guide roller R3a Shaft center R3b Cylindrical surface S Drum shaft center S1, S2, S3 Roller shaft W Wire

Claims (4)

A frame (3), a motor (4) mounted on the frame (3), and a drum (5) connected to a drive shaft (4a) of the motor (4) and capable of winding a wire (W) A suspension tool (6) provided on the upper part of the frame (3) on the upper side of the vertical line (E) passing through the center of gravity (G), and the drum (5) supported by the frame (3). An electric hoist having a plurality of rollers for guiding the wire (W) drawn out from the lower side of the vertical line (E) passing through the center of gravity (G) of the hoist;
The plurality of rollers are configured to guide the wire (W) to a vertical guide roller (R1) that guides the wire (W) on a vertical line (E) passing through the center of gravity (G) of the hoist, and drum the wire (W) to the vertical guide roller (R1). A horizontal position guide roller (R2) for guiding a horizontal position parallel to the axis (S) and a wire (W) fed from the drum (5) to the horizontal position guide roller (R2) are connected to the drum axis (S ) And an orthogonal guide roller (R3) for guiding a horizontal position in a direction orthogonal to the electric hoist. The drum axis (S) of the drum (5) is substantially perpendicular to the vertical line (E),
The orthogonal guide roller (R3) is disposed at a position for guiding the wire (W) fed from the outer periphery of the drum (5) substantially directly below the drum axis (S),
The horizontal position guide roller (R2) and the vertical guide roller (R1) guide the wire (W) received from the orthogonal guide roller (R3) to the vertical line (E) substantially under the drum axis (S). The electric hoist according to claim 1, wherein the electric hoist is disposed at a position.   The orthogonal guide roller (R3) has an axial center (R3a) arranged parallel to the drum axial center (S), and a cylindrical surface (R3b) around which the wire (W) is wound is formed long in the axial direction. The electric hoist according to claim 1 or 2, wherein the cylindrical surface (R3b) is formed to have a gradually decreasing diameter from the center in the axial direction toward both ends.   A wire detachment preventing member (9) for restricting the wire (W) from being detached from the vertical guide roller (R1) and the horizontal position guide roller (R2) is provided. The wire detachment prevention member (9) is a frame ( 3) It is attached to the roller shaft (S2) of the horizontal position guide roller (R2) or the roller shaft (S1) of the vertical guide roller (R1). The electric hoist according to any one of claims 1 to 3, wherein the guide roller side wire detachment restricting portion (9b) is integrally formed.

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