JP2018199583A - Electric hoist - Google Patents

Abstract

To accurately guide a wire from an outer periphery of a drum to a position immediately below the center of gravity of a hoist.SOLUTION: An electric hoist includes: a frame 3; a motor 4; a drum 5 which can wind up a wire W; a suspending tool 6 on a vertical line E passing through the center of gravity G of a hoist; and a plurality of rollers guiding the wire delivered from the drum to a lower side on the vertical line passing through the center of gravity of the hoist. The plurality of rollers include: a vertical guide roller R1 guiding the wire on the vertical line; a horizontal position guide roller R2 guiding a horizontal position of the wire parallel to a drum shaft center S up to the vertical guide roller; and an orthogonal guide roller R3 guiding a horizontal position orthogonal to the drum shaft center of the wire delivered from the drum up to the horizontal position guide roller. The orthogonal guide roller R3 is arranged at a position where it guides the wire W immediately after being delivered from an outer periphery of the drum 5 to a position substantially just below the drum shaft center S and winds up the wire on the horizontal position guide roller R2 substantially just below the drum shaft 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 include a vertical guide roller R1 that guides the wire W on a vertical line E passing through the hoist gravity center G, and the horizontal position of the wire W in a direction parallel to the drum axis S to the vertical guide roller R1. A horizontal position guide roller R2 for guiding and an orthogonal guide roller R3 for guiding the horizontal position of the wire W fed from the drum 5 in the direction perpendicular to the drum axis S to the horizontal position guide roller R2 are provided. And
The drum axis S of the drum 5 is substantially perpendicular to the vertical line E,
The horizontal position guide roller R2 and the vertical guide roller R1 are configured such that the roller shaft S2 and the roller shaft S1 are substantially perpendicular to the drum axis S and the vertical line E, and the wire W received from the orthogonal guide roller R3 is drummed. It is arranged at a position to guide up to the vertical line E, almost directly below the axis S,
The orthogonal guide roller R3 has a roller shaft S3 substantially parallel to the drum axis S of the drum 5 and substantially orthogonal to the roller shaft S2 of the horizontal position guide roller R2, and immediately after being fed from the outer periphery of the drum 5. The wire W is arranged at a position where the wire W is guided substantially directly below the drum axis S and wound around the horizontal position guide roller R2 substantially below the drum axis S.

Second, the roller shaft S3 of the orthogonal guide roller R3 is supported at both ends by a roller holder 16 mounted on the inner surface of the frame 3.
Thirdly, in the orthogonal guide roller R3, a cylindrical surface R3b around which the wire W is wound is formed to be long in the axial direction, and this cylindrical surface R3b is formed to gradually decrease in diameter from the center in the axial direction toward both ends. It is characterized by being.

  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. It is characterized by being attached to the roller shaft S2 or the roller shaft S1 of the vertical guide roller R1.

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, according to the first aspect of the present invention, the wire W immediately after being fed out from the drum 5 is guided almost directly below the drum axis S by the orthogonal guide roller R3, and the wire W guided by the orthogonal guide roller R3 is horizontally positioned. The guide roller R2 guides the horizontal position while being almost directly below the drum axis S, and guides the wire W guided horizontally by the horizontal position guide roller R2 onto the vertical line E passing through the hoist gravity center G by the vertical guide roller R1. It is possible to smoothly guide the position of the wire W fed out from the drum 5 in the three orthogonal directions with three rollers without difficulty, and the detachment of the wire W from the roller can be reduced.

In the invention according to claim 2, since the roller holder 16 that supports the roller shaft S3 of the orthogonal guide roller R3 is mounted on the inner surface of the frame 3, the orthogonal guide roller R3 can be easily arranged.
In the invention according to claim 3, 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 R3b of the orthogonal guide roller R3, and Since the position where the wire W is wound around the horizontal position guide roller R2 is substantially immediately below the drum axis S, the position where the wire W is wound on the cylindrical surface R3b of the orthogonal guide roller R3 is the center of the drum axis S of the drum 5. Even if the wire W moves in the direction, the wire W can be maintained almost directly below the drum axis S, and smooth guidance can be achieved.

  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 R 1 and the horizontal position guide roller R 2.

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. Guide the horizontal position in the direction orthogonal 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 includes a vertical guide roller (R1) for guiding the wire (W) on a vertical line (E) passing through the center of gravity (G) of the hoist, and the vertical guide roller (R1) to the wire (W). The drum of the horizontal position guide roller (R2) for guiding the horizontal position in the direction parallel to the drum axis (S) and the wire (W) fed from the drum (5) up to the horizontal position guide roller (R2) It is composed of an orthogonal guide roller (R3) for guiding a horizontal position in a direction orthogonal to the axis (S),
The drum axis (S) of the drum (5) is substantially perpendicular to the vertical line (E),
In the horizontal position guide roller (R2) and the vertical guide roller (R1), the roller shaft (S2) and the roller shaft (S1) are substantially orthogonal to the drum axis (S) and the vertical line (E). The wire (W) received from the orthogonal guide roller (R3) is disposed at a position for guiding the wire (W) to the vertical line (E) substantially directly below the drum axis (S).
The orthogonal guide roller (R3) has a roller shaft (S3) substantially parallel to the drum axis (S) of the drum (5) and substantially orthogonal to the roller shaft (S2) of the horizontal position guide roller (R2). The wire (W) immediately after being fed from the outer periphery of the drum (5) is guided almost directly below the drum axis (S), and the horizontal position guide roller (R2) is almost directly below the drum axis (S). An electric hoist characterized by being arranged at a position to be wound around.   The electric shaft according to claim 1, wherein the roller shaft (S3) of the orthogonal guide roller (R3) is supported at both ends by a roller holder (16) mounted on the inner surface of the frame (3). Hoist.   In the orthogonal guide roller (R3), a cylindrical surface (R3b) around which the wire (W) is wound is formed to be long in the axial direction, and this cylindrical surface (R3b) is gradually reduced in diameter from the center in the axial direction to both ends. The electric hoist according to claim 1, wherein the electric hoist is formed as follows.   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) The roller shaft (S2) of the horizontal position guide roller (R2) or the roller shaft (S1) of the vertical guide roller (R1) is attached to any one of claims 1 to 3. The electric hoist described.

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