JPH0720141Y2 - Flat belt hoist - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat belt hoist.

[0002]

As is well known, as a small hoisting machine, an electric hoist and an electric chain block have been widely used in the industry. A wire rope or a load chain is used for the hoisting body in such a conventional hoisting machine, but since it is not possible to set a use limit on itself,
There is a problem such as causing a cutting accident even if it is used even when it is time to replace the flat belt 2 '.
The hoisting machine that uses

A conventional flat belt hoist has a casing 9 '.
The flat belt 2'is wound around the winding drum 3'covered by the winding drum 3 ', and the winding drum 3'is normally or reversely rotated by a forward / reverse motor to hang the belt from the winding drum 3'to the end of the flat belt 2'. The load section 1'is hung or unwound.
When the belt hanging portion 1'is rewound, the winding drum 3 '
A limit switch 5'was provided to prevent wrapping around. Specifically, the above limit switch 5 '
Is turned on when the belt hoisting portion 1 ′ to be unwound by the winding drum 3 ′ is unwound to a certain unwinding position, and the forward / reverse motor electrically connected to the limit switch 5 ′ is stopped, The rotation movement of the winding cylinder 3'is stopped to stop the rewinding. For this reason, the winding drum 3 '
Limit switch 5'located below the shaft 3a ', a switch end 6'provided on the limit switch 5', a detection lever for operating the switch end 6 ', and the belt load section. 1'has a stopper portion 7'folded back, and the belt-hanging portion 1'is rewound, the stopper portion 7'pushes up the detection lever, and the detection lever switches. The limit switch 5'is operated by operating the end 6 '.

[0004]

According to the above prior art, there are some problems in the following points. That is, it has been conventionally required to increase the head as 1,
In order to increase the lifting height, it is necessary to make the final rewinding position as high as possible within a range in which the predetermined distance from the upper end of the casing to the lowermost end of the belt hanging portion is reduced.
The term "final unwinding position" as used herein means that the belt suspension has a predetermined distance from the upper end of the casing to the lowermost end of the belt suspension when the belt suspension is rewound and stopped by the limit switch. This is the stop position of the cargo section. Further, the lift is a distance from the final unwinding position of the belt suspended portion to the position at the lowest end of the belt suspended portion when the belt suspended portion is hung down to an arbitrary position. Therefore, it is considered that the limit switch is arranged so that the switch end of the limit switch is located above the axis of the winding cylinder so as to answer the above request. When focusing on the relationship between the trunk and the belt hanging part,
There is a certain limit to the position of the switch end of the limit switch above the axis of the winding cylinder.
There is a certain limit in reducing the final unwinding position of the belt suspended portion in the relationship between the winding cylinder and the belt suspended portion. Further, as 2 above, when the flat belt is unwound by the winding drum, the flat belt is unwound around the winding drum while the unwinding force of the winding drum is directly transmitted to the flat belt. The flat belt was sometimes excessively or insufficiently wound around the winding drum and was loosened or overtightened.

Therefore, the object of the present invention is to set the final unwinding position where the above belt hoisting portion is unwound as high as possible, thereby increasing the lifting height, and It is an object of the present invention to provide a technique capable of smoothly rewinding a flat belt so that the flat belt can be wound around a winding cylinder without excess or deficiency.

[0006]

[Means for Solving the Problems] In order to solve the above object,
The present invention has the following technical means. That is, the present invention will be described with reference to the reference numerals in the accompanying drawings corresponding to the embodiments.
The flat belt 2 is wound around the winding drum 3, and the winding drum 3 is normally or reversely rotated by the forward / reverse motor 8 so that the winding drum 3 is rotated.
Hang the belt load section 1 at the end of the flat belt 2 from
Or in a flat belt hoist for rewinding;
The guide roller 4 having the shaft 4a at a position above the shaft 3a of the guide roller 4 is arranged at a predetermined interval with respect to the winding drum 3, and is arranged above the shaft 4a of the guide roller 4. The casing 9 having the switch end 6 of the limit switch 5 disposed at the position and having the flat belt guide surface 11 for guiding the flat belt 2 wound by the winding drum 3 on its back surface is the winding drum. 3 and guide roller 4
In addition, the flat belt hoisting machine is characterized by covering the switch end 6 of the limit switch 5.

A slit 12 is formed in the casing 9 at a position covering the guide roller 4, a limit switch 5 is arranged in the slit 12, and a switch end 6 of the limit switch 5 is guided by the guide roller 4. It is considered that the flat belt 2 faces the flat belt 2.

It is considered that a flat belt guide portion 15 having a flat belt passage hole 14 having a taper 13 so as to expand in the direction of the lower surface of the flat belt 2 is provided at the midpoint of the unwinding of the flat belt 2.

[0009]

According to the above construction, the guide roller 4 having the shaft 4a is disposed at a position above the shaft 3a of the winding drum 3, and further above the shaft 4a of the guide roller 4. By disposing the switch end 6 of the limit switch 5 at such a position, it is possible to increase the final rewinding position K of the belt suspended portion 1. That is, when focusing on the relationship between the winding drum 3 and the belt hanging portion 1, in order to arrange the switch end 6 of the limit switch 5 with respect to the winding drum 3, there is a certain limit in the arrangement position. However, according to the present invention, the switch end 6 of the limit switch 5 is arranged above the shaft 4a of the guide roller 4 whose shaft 4a is located above the shaft 3a of the winding drum 3, whereby the above limit switch 5 is provided. The position of the switch end 6 of the switch 5 is relatively upward, and as a result, the lowermost end of the belt hoisting portion 1 in the relationship between the winding cylinder 3 and the belt hoisting portion 1 rises. It is possible to raise the final rewind position K of the belt suspended portion 1. 2, the winding drum 3 and the guide roller 4 and the guide roller 4 and the winding drum 3 and the guide roller 4 which are arranged with the above-mentioned predetermined interval by the casing 9 integrally covering the switch end 6 of the limit switch 5. A flat belt guide surface 11 formed by the surface of the casing 9 is provided between the flat belt 2 and the flat belt 2. When the flat belt 2 is wound up, the flat belt 2 is guided by the guide roller 4 and the flat belt guide surface 11 and wound around the winding drum 3.
Moreover, the flat belt 2 of the winding drum 3 is guided by the guide roller 4 itself.
The flat belt 2 is smoothly rewound on the winding drum 3 by indirectly transmitting the rewinding force to the flat belt 2.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings. That is, the flat belt 2 having the belt hanging portion 1 at the tip
A guide roller 4 is arranged at a predetermined interval with respect to a winding cylinder 3 for hanging or unwinding. The switch end 6 of the limit switch 5 is arranged on the guide roller 4. In addition, the belt suspended portion 1 is provided with a stopper portion 7 which is a portion where the flat belt 2 that hits the switch end 6 of the limit switch 5 is folded back when the belt suspended portion 1 is unwound. There is. The flat belt 2 is supported by the winding cylinder 3 and the guide rollers 4 and is suspended from the guide rollers 4. Further, the belt hanging portion 1 at the tip of the flat belt 2 is hung down by rotating the winding cylinder 3 forward or backward by the forward / reverse motor 8 continuously provided on the shaft a of the winding cylinder 3. , Or rewind.

Then, the winding drum 3 and the guide roller 4,
A casing 9 integrally covers a switch end 6 of the limit switch 5. The casing 9 has a transfer part 10 between the winding cylinder 3 and the guide roller 4, and the flat belt 2 is rewound on the back surface of the transfer part 10 by the reverse rotation of the winding cylinder 3 in the forward direction N. Flat belt 2 when
The surface for guiding the flat belt 2 is referred to as a flat belt guide surface 11. A slit 12 is formed in the casing 9 at a position covering the guide roller 4, and a limit switch 5 electrically connected to the forward / reverse motor 8 is arranged in the slit 12. The switch end 6 of the limit switch 5 faces the flat belt 2.

Next, attention will be paid to the positional relationship among the shaft 3a of the winding cylinder 3, the shaft 4a of the guide roller 4, and the switch end 6 of the limit switch 5. That is, when the position of the shaft 3a of the winding drum 3 is set as a reference position, the winding drum 3 is
The guide roller 4 at a position above the shaft 3a of the
The shaft 4a of the guide roller 4 is located.
The switch end 6 of the limit switch 5 is located at an upper position with respect to. In other words, referring to FIG. 3, the position of the shaft 3a of the winding cylinder 3 is the winding cylinder shaft position A, the position of the shaft 4a of the guide roller 4 is the guide roller shaft position B, and
When the position of the switch end 6 of the limit switch 5 is set to the switch end position C, the winding drum shaft position A increases to the guide roller shaft position B, and the guide roller shaft position B increases to the switch end position. There is.

A nylon belt or the like is considered as the flat belt 2.

The operation of the above arrangement will be described below. That is, when the winding cylinder 3 is normally rotated by the forward / reverse motor 8, the flat belt 2 wound around the winding cylinder 3 is guided by the guide roller 4 and passes through the casing 9 to the outside. As a result, the belt load portion 1 at the tip of the flat belt 2 is hung down. On the contrary, by rotating the winding cylinder 3 in the reverse direction by the forward / reverse motor 8, the flat belt 2 is guided by the guide roller 4, passes through the inside of the casing 9, and is further guided by the flat belt guide surface 11 of the casing 9. The flat belt 2 is wound around the winding drum 3, and thus the belt load portion 1 at the tip of the flat belt 2 is unwound. And
When the belt suspended portion 1 is rewound, the stopper portion 7 of the belt suspended portion 1 hits the switch end 6 of the limit switch 5 from below, and the limit switch 5 is switched on. Then, in response to the electric signal from the limit switch 5, the forward / reverse motor 8 is stopped, the rotation of the winding cylinder 3 is stopped, and the rewinding operation of the flat belt 2 is stopped.

Here, the belt suspended portion 1 has a predetermined distance H from the upper end of the casing 9 to the lowermost end of the belt suspended portion 1 when the belt suspended portion 1 is unwound and stopped by the limit switch 5. The stop position of 1 is the final rewind position K. Further, the distance from the final unwinding position K of the belt hoisting portion 1 to the position of the belt hoisting portion 1 when the belt hoisting portion 1 is hoisted down to an arbitrary position is referred to as a lift L.

That is, the lift L depends on the final rewinding position K of the flat belt suspended portion 1 and within a predetermined distance H from the upper end of the casing 9 to the lowermost end of the belt suspended portion 1. The higher the final rewind position K is, the larger the lift L is.

Next, with reference to FIG. 4, an example in which the flat belt guide portion 15 is added to the above embodiment is shown. That is, the flat belt guide portion 15 is formed with a flat belt passage hole 14 penetrating from the upper surface 16 to the lower surface 17 so that the inner wall surface defining the flat belt passage hole 14 is expanded toward the lower surface 17. It has a taper 13. The flat belt guide portion 15 is provided at a midway position of the flat belt 2 being wound, specifically, at a position immediately before the flat belt 2 is unwound and comes into contact with the guide roller 4. The flat belt 2 is guided through the flat belt passage hole 14 of the flat belt guide portion 15.

As described above, the guide roller 4 having the shaft 4a is disposed at a position above the shaft 3a of the winding drum 3, and the guide roller 4 is positioned above the shaft 4a of the guide roller 4. By arranging the switch end 6 of the limit switch 5 at such a position, it is possible to increase the final rewinding position K of the belt suspended portion 1 and thereby increase the lift L. Further, since the flat belt guide surface 11 is provided by the casing 9, the flat belt 2 is guided by the flat belt guide surface 11 when the flat belt 2 is unwound.

[0019]

As described in detail above, according to the first aspect of the present invention, the guide roller having a shaft is disposed at a position above the shaft of the winding cylinder as 1, and the guide roller is further provided. By arranging the switch end of the limit switch at a position that is located above the axis of the, the position at which the switch end of the limit switch is arranged is relatively upward, which allows the winding cylinder and the belt hanging portion to be disposed. The lowermost end of the belt suspended portion in relation to and rises, thereby making it possible to raise the final rewind position of the belt suspended portion,
As a result, it is possible to make the above-mentioned head relatively large.
2, a casing integrally covering the winding cylinder, the guide roller, and the switch end of the limit switch, and the surface of the casing between the winding cylinder and the guide roller arranged with the above-mentioned predetermined interval. A flat belt guide surface is provided, and when the flat belt is wound up, the flat belt is guided by the guide roller and the flat belt guide surface to be wound around the winding drum, and is unwound by the guide roller itself to be given to the flat belt of the winding drum. By indirectly transmitting the force to the flat belt, the flat belt can be smoothly rewound on the winding cylinder.

According to a second aspect of the present invention, by forming a slit in the casing and disposing a limit switch in the slit, it is arranged so that the switch end of the limit switch faces the guide roller. Easy to set up.

According to a third aspect of the present invention, when the flat belt is unwound by the flat belt guide portion, the flat belt is arranged in the vertical direction and moved in the unwinding direction so that the flat belt is easily unwound. Is.

[Brief description of drawings]

FIG. 1 is a left side view schematically showing a flat belt hoist according to the present invention.

FIG. 2 is a front view schematically showing a flat belt hoist according to the present invention.

FIG. 3 is a left side view schematically showing a state in which the left side surface portion of the casing of the flat belt hoisting machine according to the present invention is removed.

FIG. 4 is a view showing a state in which a flat belt guide portion of the flat belt hoisting machine according to the present invention is added.

FIG. 5 is a schematic view of a conventional flat belt hoisting machine.

[Explanation of symbols]

1 Belt Suspended Part 2 Flat Belt 3 Winding Body 3a Winding Shaft Shaft 4 Guide Roller 4a Guide Roller Shaft 5 Limit Switch 6 Switch End 7 Stopper Section 8 Forward / Reverse Motor 9 Casing 10 Transfer Section 11 Flat Belt Guide Surface 12 Slit 13 Taper 14 Flat belt passage hole 15 Flat belt guide 16 Top of flat belt guide 17 Bottom of flat belt guide K Final rewinding position Y Reverse direction N Forward rotation direction A Winding drum shaft position B Guide roller shaft position C Switch end Position H The predetermined distance from the upper end of the casing to the lowermost end of the belt hanging part L Lifting height

Claims (3)

[Scope of utility model registration request] 1. A flat belt 2 is wound around a winding drum 3 to form the winding drum 3.
In the flat belt hoisting machine, in which the belt hoisting portion 1 at the tip of the flat belt 2 is hung or unwound from the winding cylinder 3 by revolving forward or backward by the forward / reverse motor 8; A guide roller 4 having a shaft 4a at a position above the shaft 3a of the winding drum 3 is arranged at a predetermined distance from the winding drum 3, and the shaft 4a of the guide roller 4 is attached to the guide roller 4. On the other hand, a flat belt guide surface 1 for arranging the switch end 6 of the limit switch 5 at an upper position and for guiding the flat belt 2 wound by the winding drum 3 is provided.
A flat belt hoisting machine, characterized in that a casing 9 having a back surface 1 integrally covers the winding cylinder 3, the guide roller 4, and the switch end 6 of the limit switch 5. 2. The casing 9 is provided with a slit 12 at a position covering the guide roller 4, a limit switch 5 is disposed in the slit 12, and a switch end 6 of the limit switch 5 is guided by the guide roller 4. The flat belt winding machine according to claim 1, which faces the flat belt 2 to be guided. 3. A flat belt guide portion 15 having a flat belt passage hole 14 having a taper 13 so as to expand toward the lower surface of the flat belt 2 is provided at an intermediate position of the unwinding of the flat belt 2. The flat belt hoisting machine according to claim 1.