JPH0432336Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an overload detection device for detecting the inclination of a post of a bucket elevator type continuous unloader.

[Conventional technology and its problems] Generally, a crane that unloads bulk materials such as coal and ore at a wharf with high efficiency is called an unloader, but recently such unloaders have been used for large ships (60,000 t class). In order to meet this demand, high efficiency was required, and bucket elevators began to be used instead of club bucket elevators.

One type of such continuous bucket elevator type unloader is an excavation method (side excavation method) in which bulk material is excavated while moving the entire bucket elevator to the side of the bucket, as introduced in Japanese Patent Publication No. 1983-3007. ), and the excavation method (catenary excavation method) in which the chain is placed in a catenary state (slack state) to absorb the shock caused by the vertical movement of the ship's body when excavating loose materials on the bottom of a ship. A bucket elevator type continuous unloader that can be used as appropriate is known.

When such an unloader is used in the side excavation method, loose materials may fall into the bucket elevator or collide with the hatch, causing the post to tilt, making it impossible to avoid damage caused by this.

[Means for solving the problem] Therefore, the present invention attempts to stop the drive of the aircraft when the post receives a tilting motion of a certain amount or more. An L-shaped frame is attached to the tip of the boom, and the post is rotatably mounted on the L-shaped frame via an upper support roller provided on the post side, and an elevator bucket can be placed side by side within the post to raise and lower it. In the built-in bucket elevator type continuous unloader, the upper part is attached to a support stand that can come into contact with the lower side of the L-shaped frame and that protrudes from the post.
a plurality of lower support rollers supported in a downwardly movable manner;
An overload detection device for a bucket elevator type unloader, characterized in that the inclination of the post is detected by providing a plurality of limit switches that are activated when the lower support roller moves by more than a set amount. It is in.

[Examples] The structure and operation of the present invention will be explained in detail by examples shown in the accompanying drawings.

The one shown is a bucket elevator type continuous unloader operated by an operator in the operator's cab 8. The portal 1 is movable at the wharf in a direction perpendicular to the plane of the paper, and a rotating frame 2 is mounted on the portal 1. It is rotatably supported. A boom 3 is supported at the upper end of the revolving frame 2 so as to be able to move up and down, and at the tip of the boom 3 is an L-shaped frame 4 that is composed of an annular member 4A and a rising member 4B that is integrated with the annular member 4A. The annular member 4A is movably attached so as to be always horizontal.
The post 5 is supported by the L-shaped frame 4 through the annular member 4A via an upper support roller 10A.

Further, as shown in FIG. 2, the post 5 has a rectangular horizontal cross section, and a bucket bag 6 attached to a chain 11 is housed in the post 5 so that it can be raised and lowered in parallel. As shown in FIG. 1, the chain 11 has sprockets 12, 13, 14,
It is wound around 15.

In order to use the bucket elevator for the side excavation method and the catenary excavation method as described above, the vertical motion cylinder 16 is suspended from the post 5, and the cylinder 16 is connected to the lower sprocket 14, 1.
5 is moved up and down by a rod 17.

The above structure is the main part of a known bucket elevator type continuous unloader, and in this embodiment, the following structure is particularly adopted. That is, as shown in FIG. 2, at a position below the annular member 4A of the L-shaped frame 4, the support stand 23 is attached from three locations: both ends of one side of the post 5 and the center of the side opposite to this side.
are prominently provided. Each support stand 23
A lower support roller 10B is provided on the side facing the lower surface of the annular member 4A of the L-shaped frame 4 (although the bucket elevator device itself is always supported by the upper support roller 10A).

As shown in FIG. 3, each lower support roller 10B has a rail 19 fixed to the lower surface of the annular member 4A.
It is supported by a support stand 23 with a slight gap between the two. That is, normally, the post 5 is supported on the upper surface of the L-shaped frame 4 by the upper support roller 10A, and the lower support roller 10B and the rail 19 do not come into contact with each other. The lower support roller 10B has its roll shaft 20
The roll shaft 20 is rotatably fitted to the outside through a bearing 21, and a locking nut 21A is attached to the inner end of the roll shaft 20.
is screwed onto the roll shaft 20 and the locking nut 21.
A horizontally penetrating pivot hole 22 is drilled in A,
A pin 24 supported by a support stand 23 is inserted into the pivot hole 22, and the roll shaft 20 is inserted into the pin 24.
It is rotatably supported using the fulcrum as a fulcrum.

Further, a spring adjustment bolt 25 passes through the outer end of the roll shaft 20 in the vertical direction, a nut is screwed into the portion of the spring adjustment bolt 25 that protrudes above the roll shaft 20, and a spring adjustment bolt 25 is inserted into the lower end of the spring adjustment bolt 25. A receiver 26 is provided,
The legs 27 of the spring receiver 26 are pivotally supported by the support stand 23 so that the tip of the spring adjustment bolt 25 can swing as the roll shaft 20 tilts. Spring receiver 26
A compression coil spring 28 is provided between the outer end of the roll shaft 20 and the outer end of the roll shaft 20 is supported by the spring 28 so as to push up the outer end of the roll shaft 20.
Normally, a striker 29 provided at the outer end of the striker 29 and a limit switch 31 provided on the support stand 23 via a bracket 30 are separated.

In other words, the roll shaft 20 is pushed up by the spring 28 around the pin 24, and the striker 29
and the limit switch 31 are prevented from coming into contact with each other.

Since the present embodiment has the above-described configuration, when the bucket elevator is working in the side excavation method, for example, if the bulk material collapses, the post 5 may be tilted via the bucket elevator. Even during work using the catenary excavation method, if the post 5 collides with the hatch 7 of the ship's hull and the post 5 tilts, and the degree of tilt exceeds a certain limit, the lower support roller located on the side where the post 5 tilts 10B contacts the rail 19 fixed to the lower surface of the annular member 4A, and the spring 28
is compressed and pushed down, and the roll shaft 20 is pushed down by the pin 24.
The striker 29, which is integral with the roll shaft 20 and tilts as indicated by the arrow B in FIG. 3, operates the limit switch 31. As a result, the bucket elevator type continuous unloader is brought to a complete stop by the signal from the limit switch 31.

In the above embodiment, one end of the roll shaft 20 that pivotally supports the lower support roller 10B is pivotally connected to the support stand 23, and the other end is supported by a spring so that the roll shaft 20 is tiltably supported. The same effect can be achieved even if both ends of the roll shaft 20 are supported so as to be movable up and down by the pushing force of a spring.

[Effects of the invention] In summary, the present invention adopts the configuration described in the claims for utility model registration, and therefore has the following effects.

A plurality of lower support rollers that come into contact with the L-shaped frame are supported on a support stand protruding from a post so as to be movable up and down, and a plurality of limit switches are provided that are activated when the lower support rollers move by more than a set amount. Therefore, when the post hits the hatch and is tilted, or when the post is tilted due to the collapse of loose objects, the post is in a stable support state where the tilting impact is buffered by the lower support roller. In addition, the tilting of the post can be detected accurately and reliably over a long period of time, and the bucket elevator continuous unloader can be stopped by the limit switch signal, preventing damage to the post and the machine body, and reducing operator fatigue. It can be greatly reduced and has a huge industrial effect.

[Brief explanation of drawings]

FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is a cross-sectional view of A in FIG. 1, and FIG. 3 is a cross-sectional side view taken along arrow B in FIG. 3...Boom, 4...L-shaped frame, 5...Post, 6...Bucket, 10A, B...Support roller, 20...Roll shaft, 31...Limit switch.

Claims (1)

[Scope of utility model registration request] An L-shaped frame is attached to the tip of a boom that can be raised and lowered, the post is rotatably mounted on the L-shaped frame via an upper support roller provided on the post side, and an elevator bucket is placed side by side within the post. In a built-in bucket elevator type continuous unloader that can be raised and lowered, a plurality of lower parts are capable of coming into contact with the lower side of the L-shaped frame and are supported so as to be movable up and down on support stands that protrude from the posts. 1. An overload detection device for a bucket elevator type continuous unloader, comprising a support roller and a plurality of limit switches that are activated when the lower support roller moves by more than a set amount.