JPS6316663Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a safety device for an unloader, and in particular, a response frame that responds to long foreign objects mixed in conveyed objects at the inlet of a bucket conveyor. The present invention relates to a safety device for an unloader which is provided with a frame and turns off the operating switch of the conveyor by the response of the response frame, thereby preventing foreign matter from getting caught and improving durability.

[Conventional technology]

An unloader is generally used as a device for unloading bulk materials such as coal and ore loaded on a ship. This unloader is a so-called continuous unloader that spans a bucket conveyor vertically and has a loading port at the lower end for loading bulk materials and other objects to be transported, and unloads them from this loading port. Are known. By the way, long foreign objects such as pieces of iron and wood may be mixed in the objects to be transported. In such a case, if the foreign matter is carried in by the conveyor, there is a problem that it may become jammed and cause problems such as damage to the conveyor and subsequent landing equipment. For this reason, in the past, a worker entered the ship's hold and monitored it to find any foreign objects. However, it is difficult to discover foreign matter buried in the conveyed object, and such monitoring work near the scraping section is dangerous.

The present invention was devised by focusing on the above-mentioned circumstances, and its purpose is to develop an unloader that can prevent foreign objects from getting caught and improve the durability and safety of the device. To provide safety equipment.

[Means for solving problems]

In order to achieve the above-mentioned purpose, the present invention has been developed by installing a bucket conveyor vertically supported inside a vertically supported cylindrical rotating mast for upwardly conveying objects such as bulk materials. In the unloader, a support frame is provided at the lower end of the swing mast so as to be movable up and down within a certain range along its longitudinal direction, and the lower end of the support frame is proximate so that the bucket on the upward movement side of the conveyor can be inserted therethrough. A rectangular frame-shaped response frame is fixed to surround the bucket and catch long foreign objects mixed in the conveyed object caught in the bucket, and a support frame is attached to the lower end of the swing mast to prevent the upward movement of the support frame. Accordingly, an operating switch is provided which is activated to stop the conveyor from driving.

[Effect]

When a long foreign object is caught in the ascending bucket of the conveyor, the foreign object is stopped by the response frame and moved upward. As a result, the support frame moves upward together with the response frame to actuate the actuation switch, and the drive of the conveyor is then stopped.

〔Example〕

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, an unloader 1 has a running section 2 that is movably installed at a wharf serving as a loading/unloading area.
A boom 3 is provided on the traveling section 2 so as to be horizontally swivelable and can be raised and lowered, and a cylindrical swinging mast is suspended from a top support frame 4 provided at the tip of the boom 3 and is swivelable horizontally. 5, and a scraping section 6 for scraping objects 23, such as loose objects, provided at the lower end of the swinging mast 5.

The scraping section 6 is provided with a driven sprocket 7, and the upper end of the rotating mast 5 is provided with a driving sprocket 8, and an endless annular bucket conveyor 9 is connected to both sprockets 7, 8. It is inserted into the mast 5 and spanned.
This conveyor 9 has an endless chain 10 and a bucket 1.
1 are provided at regular intervals. At the lower end of the swinging mast 5, there is an inlet 12 for carrying in objects to be conveyed by the conveyor 9, and at the upper end, there is an outlet for carrying out objects to be conveyed that have been upwardly transferred by the conveyor 9. 13 are formed respectively.

As shown in FIG. 2, the loading port 12 is provided with an unloader safety device 14 according to the present invention that detects long foreign objects mixed in the transported object 23 and stops the conveyor 9. There is. This safety device 14 is provided at the loading entrance 12 so as to be movable up and down along the conveyance direction of the conveyor 9, and closely surrounds the bucket 11 of the conveyor 9.
The response frame 15 is moved upward by long foreign objects mixed in the conveyed objects caught in the bucket, and the response frame 15 is actuated by the upward movement to stop the drive of the conveyor. It mainly consists of an operating switch 16 for

As shown in FIG. 3, the response frame 15 is formed into a rectangular frame shape so as to closely surround the outer periphery of the bucket belt 11 on the upwardly moving side. It is supported horizontally via a movably supported support arm 18. The guide frame 17 is made of a groove-shaped member and is attached to both sides of the swing mast 5 along its longitudinal direction. On the other hand, support arm 1
8 are slidably engaged within the guide frame 17, and the response frame 15 is integrally supported at the lower end portions of both support arms 18. Further, a stopper 19 is provided at the upper end of both support arms 18, and the stopper 19 is fixed to the upper end of the guide frame 17 at the distal end.
A support arm 1 is provided with a rod 19 having a
8 from falling off, and also allows vertical movement within a certain range.

In order to prevent the response frame 15 supported in this manner from moving upward unduly due to vibrations of the conveyor 9, etc., an inward locking portion 17a formed at the upper end of the guide frame 17 and an upper end of the support arm 18 are provided. A resilient spring 20 is interposed between the two parts.

Guide frame 17 on one side of the swing mast 5
An operating switch 16 consisting of a limit switch for turning off the drive power of the conveyor 9 is attached near the support arm 18, and a striker 21 is provided on one of the support arms 18 for operating the operating switch 16 by upward movement of the support arm 18. It is being

Note that the objects to be transported are transported from the transport port 13.
Furthermore, the cargo is unloaded via a conveyor on the boom 3 and a conveyor on the traveling section in sequence.

Next, the operation of the embodiment will be described.

The response frame 15 is the bucket 11 of the conveyor 9.
Since it is in a non-contact state, it is supported at the standby position at the lowermost end as shown in FIG. 2 unless foreign matter is caught, and therefore the actuation switch 16 will not operate. However, as shown in FIG.
When the bucket 11 is caught by the object and hits the response frame 5, the upward movement force of the bucket 11 is transmitted to the response frame 15 via the foreign object 22, causing it to move upward. Therefore, as the response frame 15 moves upward, the striker 21 attached to it via the support arm 18 also moves upward, and the striker 21 hits the operating switch 16 to stop the drive of the conveyor 9, as shown in FIG. I will let you do it. In this way, it is possible to automatically detect long foreign objects and prevent them from getting caught in front of the entrance 12, and the conveyor 9
It is possible to prevent damage to the landing equipment and rear-stage landing equipment, thereby improving their durability. Note that the bucket 11 moves to some extent due to inertia even after the activation switch 16 is activated, but in order to cope with this, the reaction frame 15
It is sufficient to ensure a sufficient range of movement. If the conveyor 9 is stopped due to the detection of a foreign object, it is only necessary to remove the foreign object and restart the operation of the conveyor 9, and there is no need for the operator to monitor the vicinity of the scraping section 6, improving safety. do.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

(1) The upward movement force of the bucket conveyor is transmitted to the response frame via the foreign object, and the supporting frame, which moves upward together with the response frame, operates the operating switch to stop the drive of the bucket conveyor. It is possible to automatically detect foreign objects in the front and prevent them from getting caught, improving the durability of the conveyor and subsequent landing equipment.

(2) In particular, since the response frame is formed into a rectangular frame shape that closely surrounds the bucket on the upward movement side so that it can be inserted through it, any foreign object extending in any direction from the periphery of the bucket opening will definitely be caught in the response frame. Therefore, foreign objects can be detected reliably.

(3) Therefore, it is possible to eliminate the need for monitoring work in the vicinity of the scraping section, thereby improving safety.

(4) Furthermore, since the structure is simple, it can be manufactured easily and at low cost.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an overall view of the unloader, Fig. 2 is a side view of the main parts,
3 is a sectional view taken along the line of FIG. 2, FIG. 4 is a sectional view taken along the line of FIG. 2, and FIG. 5 is a diagram for explaining the operation. In the figure, 5 is a rotating mast, 9 is a bucket conveyor, 11 is a bucket, 12 is an inlet, 13 is an outlet, 15 is a response frame, 16 is an operating switch,
18 is a support frame, 22 is a foreign object, and 23 is an object to be transported.

Claims (1)

[Scope of utility model registration request] In a safety device for an unloader in which a bucket conveyor for upwardly conveying objects such as bulk materials is vertically supported in a cylindrical rotating mast that is vertically supported, the above-mentioned rotating mast is A support frame is provided at the lower end of the support frame so as to be movable up and down within a certain range along its longitudinal direction, and the lower end of the support frame surrounds the conveyor's ascending side bucket so that it can be inserted therethrough and is pulled into the bucket. A rectangular frame-shaped reaction frame is fixed to catch long foreign objects mixed in the conveyed object, and the lower end of the swing mast is operated by the upward movement of the support frame to drive the conveyor. A safety device for an unloader, characterized in that it is provided with an activation switch for stopping the unloader.