JPH065356Y2 - Suspended chain abnormality detection device in lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for detecting an abnormality of a suspension chain in a lifting device.

[Conventional technology]

The sprocket is tensioned by a spring or other means to keep a certain tension on the chain, and when the lift table gets caught by surrounding objects (such as a rack) or a mast, it becomes impossible to descend and the sprocket position is under tension. Was misaligned due to chain slack, and the amount of misalignment was detected by a sensor and output as an abnormality (trapped).

[Problems to be solved by the device]

However, the mechanism for the detection was complicated and the height of the mast was high.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to remove all the complicated mechanism of the conventional device and electrically process it in order to reduce the cost when detecting an abnormality in the suspension chain. An object of the present invention is to provide a hanging chain abnormality detection device for a lifting device that can be used.

[Means for Solving the Problems]

In order to achieve the above object, the present invention relates to a lifting device for lifting a lifting chain by hanging a hanging chain on a lifting sprocket pivotally supported on the lifting table, and moving the lifting chain to at least the lifting table. The structure is provided with a touch switch that operates when the hanging chain comes into contact when the hanging chain sags.

[Action]

When the lift table is lowered, if the lift table gets caught by surrounding objects (such as a rack) or a mast and cannot be lowered, the hanging chain sags, and these hanging chains come into contact with the touch switches to activate the touch switches and lift them. The chain operates and detects an abnormality in the hanging chain.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the front of the lifting device, which comprises a portal-shaped device body 2 on which side members 3 of the device 2 are mounted.
A supporting body 4 is fixedly mounted on the supporting body 4, and a lifting motor 5 is supported on the supporting body 4. Driving sprockets 6 and 6'are supported on the support body 4, intermediate sprockets 7 and 7'are supported on the side members 3, and suspension sprockets 9 and 10 are supported on the upper member 8 of the apparatus main body 2, respectively. is there.

Reference numeral 11 in FIG. 1 is an elevator, and brackets 14, 1 are provided on the upper ends of the left and right members 12, 13 of the elevator 11.
5 is fixed, and suspension sprockets 16 and 17 are pivotally supported on these brackets 14 and 15.

The drive sprockets 6 and 6'are rotated in the forward and reverse directions by a lifting motor 5.

The left and right suspension chains 1 are attached to the upper member 8.
The left suspension chain 19 has the left suspension sprocket 16, the left suspension sprocket 9, the right suspension sprocket 10 and the sprocket 10 ′ coaxial with each other. , The intermediate sprocket 7'and the drive sprocket 6 '.

The right suspension chain 20 is hung on the right suspension sprocket 10, the intermediate sprocket 7, and the drive sprocket 6.

Touch switches 21 and 22 are fixed to the upper ends of the brackets 14 and 15 of the front lift 11, and the left hanging chain 19 is inserted into the insertion hole 21a of the left touch switch 21 and the right hanging chain 19 is inserted into the insertion hole 21a. Insertion hole 2 of touch switch 22
The right suspension chain 20 is inserted through 2a.

Therefore, the lifting table 11 is lifted and lowered by moving the lifting chains 19 and 20 by the rotation drive of the lifting motor 5 and via the lifting sprockets 16 and 17, but when the lifting table 11 is lowered. When the lifting platform 11 is caught by surrounding objects (such as a rack) or a mast and cannot be lowered, the hanging chains 19 and 20 sag as shown in FIG. 5, and the hanging chains 19 and 20 are touch switches 21 and 20. Contact 22.

A touch switch 23 is also provided on the support body 4, and the hanging chain 1 inserted through the touch switch 23
9 and 20 sag and touch the touch switch 23.

For this reason, the touch switches 21, 22, 23 are turned on to detect an abnormality in the hanging chains 19, 20.

[Effect of device]

As described above in detail, the lifting chain abnormality detection device in the lifting device according to the present invention hangs the lifting chain on the lifting sprocket pivotally supported by the lifting platform, and moves the lifting chain up and down by the movement of the lifting chain. In the elevating device, at least the elevating table is provided with a touch switch which is operated by the hanging chain coming into contact with the hanging chain when the hanging chain sags.

Therefore, when the lifting table is lowered, if the lifting table is caught by surrounding objects (such as a rack) or a mast and cannot be lowered, the hanging chain sags, and these hanging chains come into contact with the touch switch to activate the touch switch. It is possible to detect abnormalities in the hanging chain.

For this reason, it is possible to detect an abnormality in the hanging chain, remove all the complicated mechanisms of the conventional device, and electrically process them to achieve low cost and no contact.

[Brief description of drawings]

FIG. 1 is a front view of an elevating device equipped with a hanging chain abnormality detecting device according to the present invention, FIG. 2 is an enlarged view of part II in FIG. 1, and FIG. 3 is an arrow view from the direction of FIG. FIG. 4 is an explanatory diagram of a normal meshing state of the suspension chain, and FIG. 5 is an explanatory diagram of an abnormal meshing state of the suspension chain. 11 is a lift, 16 and 17 are suspension sprockets, 1
9 and 20 are hanging chains.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B66D 1/54 C 2124-3F

Claims (1)

[Scope of utility model registration request] 1. A lifting device for hanging a hanging chain on a lifting sprocket pivotally supported on a lifting table and raising and lowering the lifting table by moving the hanging chain. At least the lifting table has a hanging chain when the hanging chain sags. A hanging chain abnormality detection device in a lifting device, which is provided with a touch switch that is operated by contacting with each other.