JP2768026B2 - Detecting device for slack of lifting belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a slack of a lifting belt in a suspension type lifting apparatus in which an object supporting means is suspended by a plurality of lifting belts. Things.

[0002]

2. Description of the Related Art In a suspension type lifting apparatus of this kind, when a transferred object supporting means which is lowered by feeding a lifting elevating belt is caught by something during a descending stroke, or when the transferred object supporting means is lifted. When one of the lifting elevating belts comes off the guide during the elevating drive, the specific belt is slackened. Unless the belt slack is detected in real time and the feeding and winding operation is stopped immediately, accidents such as undesired tilting of the transported object supporting means, collapse of the load, and breakage of the overloaded belt will occur. Cause.

Accordingly, this type of suspension type lifting device requires a slack detection device for the suspension lifting belt. As a conventional looseness detection device for the suspension type lifting belt, for example, an actual flatbed is used. As described in JP-A-2-124989,
The winding drum of the lifting lifting belt provided on the suspension device body side is configured to rotate relative to the drum drive shaft within a certain range against the spring when the belt is loosened. A structure in which the relative rotation of the belt winding drum with respect to the drum drive shaft is detected by a limit switch, and Japanese Patent Publication No. 44-2887.
As described in Japanese Patent Publication No. 5 (1994), an urging means (spring) that bends the hanging wire in a predetermined direction when the hanging wire is loosened is attached to a portion above the hanging side end of the hanging wire. There is a known configuration in which a limit switch provided with an actuator that moves following the bending of the wire is disposed on the side opposite to the side where the wire is bent by the biasing means.

[0004]

In the above-described conventional slack detecting devices, the number of components is large and the structure is complicated, so that not only is the cost inevitably increased but also this kind of loose detecting device. Also, it is not easy to carry out the method on an existing suspension elevating device that does not have the device.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an apparatus for detecting slack of a suspension elevating belt which can solve the above-mentioned conventional problems. In the suspension type lifting apparatus in which the transported object support means 12 is suspended by a plurality of suspension lifting belts 11 so as to be able to move up and down, the suspension lifting and lowering apparatus is used. The hanging side end 11a of the belt 11 is fixed at a position below the upper end of the vertical side surface 12a of the transported object supporting means 12 by an appropriate distance, and is higher than the hanging side end 12a of the hanging elevating belt 11. The magnetic plate 18 to be detected is located at a position facing the vertical side surface 12a of the transported object supporting means 12, respectively.
And a vertical side surface 12 of the transported object support means 12.
The configuration a is provided with a proximity switch 20 for detecting the magnetic plate 18 to be detected only when the suspension elevating belt 11 is tensioned vertically.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, reference numeral 1 denotes one guide rail erected at an appropriate height, and 2 denotes a guide rail. This is a transport train that travels along the guide rail 1. The transport train 2 includes a driving trolley 3 and a driven trolley 4,
And a train main body 5 suspended on the guide rail 1 via both trolleys 3 and 4. The drive trolley 3 has a drive wheel 6 and a drive wheel 6 via a speed reducer 7. And a motor 8 for driving the motor.

The train body 5 includes a pair of left and right and two pairs of front and rear four belt winding drums 9 and a motor 10 that drives the four belt winding drums 9 in forward and reverse rotation in conjunction with each other. The transported object support means 12 is hung horizontally by four lifting elevating belts 11 wound around the inner ends of which are fixed to the respective belt winding drums 9. The conveyed object support means 12 is provided with a pair of left and right hangers 13 which can be opened and closed freely, and a conveyed object 14 is hung by the hanger 13.

As shown in FIG. 3, the suspension side end portion 11a of each of the lifting lifting belts 11 is connected to the transported object supporting means 1.
The pedestal 15 and the holding plate 1 near the lower end of the second vertical side surface 12a.
6 and bolts 17, and a detection object is provided at a position facing the vertical side surface 12 a of the conveyed object support means 12 above the suspension side end 11 a of each of the suspension elevating belts 11. The detected portion 19 is formed by attaching the magnetic plate 18. In the state where the lifting belt 11 is vertically tensioned, the proximity switch 20 is turned on the vertical side surface 12a of the transported object support means 12 so as to face the magnetic plate 18 to be detected with a small gap. Attached to.

The transport train 2 operates the motor 8 with electric power supplied from a power supply line laid on the guide rail 1 as is well known in the related art, thereby driving the drive wheels 6 to rotate and moving along the guide rail 1. The vehicle can travel forward or backward. And the hanger 13 of the transferred object support means 12
Can transport the transported object 14, but when the transported object 14 is unloaded,
The motor 10 is operated by the electric power supplied as described above, so that each belt winding drum 9 is driven to rotate so that each suspension elevating belt 11 is extended or wound, and the conveyed object supporting means 12 is raised and lowered. Can be.

As described above, while the lifting and lowering belt 11 is being extended to lower the transported object support means 12,
When the transported object support means 12 is caught on something on the ground side, one or two belts 11 close to the caught place are slackened. Further, when the belt 11 is not directly hung down from the belt winding drum 9 but is hung down via a guide pulley or the like, one belt 11 comes off from the guide pulley or the like at the time of driving up and down of the transported object support means 12. Then, the transported object support means 12 is suspended by the three belts 11 remaining slackened.

As described above, when the specific belt 11 is slackened during the feeding and winding operation of the suspension elevating and lowering belt 11, as shown in FIG.
The detection target magnetic plate 18 on the belt 11 side is separated from 0, and the proximity switch 20 stops detecting the detection target magnetic plate 18. That is, the state is switched from the on state to the off state. Accordingly, the control system is configured so that when at least one of the four proximity switches 20 is turned off, the rotation drive of the belt winding drum 9 by the motor 10 is automatically stopped and the drum 9 is braked. As a result, if any one of the four lifting elevating belts 11 is loosened, the lifting and lowering drive of the transported object supporting means 12 can be automatically stopped immediately.

The transferred object support means 12 may have any structure.

[0013]

As described above, according to the apparatus for detecting slack of a lifting elevating belt of the present invention, the hanging end of the lifting elevating belt is moved from the upper end of the vertical side surface of the transferred object supporting means. By fixing to a position below the appropriate distance, when the lifting lifting belt is loosened, the part of the lifting lifting belt facing the vertical side surface of the transported object supporting means must be separated from the vertical side surface. Movement of the lifting elevator belt in a direction away from the vertical side surface of the transported object support means, that is, the slack of the lifting elevator belt is detected by a detection object attached to the lifting elevator belt. Since the detection is performed by the proximity switch attached to the magnetic plate and the vertical side surface of the transported object supporting means, when the suspension lifting / lowering belt is loosened, the detected portion of the suspended belt is moved in a predetermined direction. Bend to Biasing means for (spring)
It is not necessary to simply add two parts, a magnetic plate for detection and a proximity switch, and the proximity switch can be directly attached to the vertical side surface of the conveyed object support means. It is extremely simple and can be implemented inexpensively. Further, the present invention can be implemented very easily and inexpensively with an existing suspension elevating device.

[Brief description of the drawings]

FIG. 1 is an overall schematic side view.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged side view showing a main part of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide rail 2 Transport train 9 Belt winding drum 10 Drum drive motor 11 Suspension lifting / lowering belt 11a Hanging end of belt 12 Conveyed object support means 12a Estimated side face of conveyed object support means 13 Hanger 14 Coated Conveyed object 18 Magnetic plate for detection 20 Proximity switch

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenichiro Kawato 3-2-11 Moundoshima, Nishiyodogawa-ku, Osaka-shi, Osaka Inside Daifuku Co., Ltd. (56) References JP-B-44-28875 (JP, B1) (58) Field surveyed (Int.Cl. ⁶ , DB name) B66C 15/02 B66C 17/04 B66D 1/54

Claims (1)

(57) [Claims] In a suspension type lifting apparatus in which an object supporting means is suspended by a plurality of suspension lifting / lowering belts so as to be able to move up and down, the suspension side end of said suspension lifting / lowering belt is Conveyed
A suitable distance below the upper end of the vertical side of the object support means
Fixed above the lifting end of the suspension lifting belt.
Inspection is performed at a location facing the vertical side surface of the transported object support means.
Attach the magnetic plate for output, and set it on the vertical side
On the surface, the lifting belt for suspension is tensioned vertically
A slack detection device for a lifting elevating belt provided with a proximity switch for detecting the magnetic plate to be detected only when the belt is detected.