JPH0452235Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an elevator for powder and granular material that transports powder and granular material by raising and lowering a bucket.

(Prior Art) Conventionally, there have been methods that use the total basis weight method in order to quantitatively supply powder or granular materials, such as the method disclosed in Japanese Patent Application Laid-Open No. 109826/1983. On the other hand, by attaching the bucket to the rail for raising and lowering the bucket so that it can be raised and lowered via a roller, and raising and lowering the bucket via a wire using a hoisting device driven by a motor, the powder particles are introduced into the bucket at the lower end of the rail. BACKGROUND ART Elevators for powder and granular materials that transport objects upward are used for various purposes.

In such elevators for powder and granular materials, excessive loads may be applied during transportation due to foreign matter getting caught between the bucket rollers and the rails. In order to ensure safety functions through processing such as stopping, overload detection is required. In addition, there are cases where you want to change the amount of powder and granules conveyed by the bucket per time depending on changes in the amount of powder and granules used, or when you want to check the amount of powder and granules input into the bucket from the previous process. In such cases, it is desirable to measure and display the weight of the powder in the bucket.

In response to these demands, for example, conveyors that detect overload based on changes in motor current are known for general conveyors. There was nothing like that.

(Purpose of the invention) In view of these circumstances, the present invention is capable of detecting overload during transport of powder and granular material and measuring the weight of the transported powder and granular material using a simple structure. The present invention provides an elevator for powder and granular materials.

(Structure of the invention) The present invention consists of a rail for lifting a bucket, a bucket for transporting powder and granular material that is attached to the rail so that it can be raised and lowered via a roller, and a bucket that is driven by a motor to move the bucket via a pulling rope. In an elevator for powder and granular material, which is equipped with a hoisting device for raising and lowering the powder and transporting the powder and granular material put into a bucket upward, a drive unit equipped with the hoisting device is mounted on a mounting frame in a state in which it can float. A load detector is provided between the drive unit and the mounting frame to detect the load acting on the bucket by detecting the force that the drive unit receives from the towing rope, and the output of this load detector is and a weight measuring device that measures the weight of the conveyed object in the bucket based on the output of the load detector. It is.

With this configuration, based on the output of the load detector, when an overload occurs during transport of the powder or granular material, this is detected, and the weight of the powder or granular material transported by the bucket is measured.

(Example) Fig. 1 shows the overall structure of an embodiment of the present invention in which a powder elevator is used to transport a steel shot for backing up a shell mold in shell mold casting. 1
2 is a powder/grain material (steel shot) charging hopper, 2 is a receiving hopper, and the charging hopper 1 is located at the bottom, and the receiving hopper 2 is located at the top. The bucket elevator rail 3 of the powder elevator is arranged to extend upward from a position corresponding to the input hopper 1, reach above the receiving hopper 2, and is attached to a rail frame 4. A bucket 5 for transporting powder and granular material is attached to the rail 3 via rollers 6 so as to be movable up and down. Specifically, a pair of rails 3 made of H-beam steel are arranged at a predetermined interval on the left and right, and rollers 6 provided at the front and rear of both sides of the bucket 5 engage with the grooves of the rails 3. (See Figure 2). In addition, if necessary, three rails including the rail 3' shown by the two-dot chain line in FIG. The two bucket bags 5 may be mounted so that they can be raised and lowered, respectively, and the two bucket bags 5 may be raised and lowered alternately by a hoisting device 9, which will be described later.

At the top of the rail 3 is a drive unit mounting frame 7.
A drive unit 10 equipped with a hoisting device 9 driven by a motor 8 is provided on the mounting frame 7 . The above hoisting device 9
The wire 11 (hauling rope) led out from the rail 3 is hung on a sheave 13 attached to the upper end of the rail 3 via a bracket 12, and further hung on a sheave 14 provided on the bucket cart 5. The tip is attached to a mounting bracket 15 provided at. By the hoisting and unwinding operations of the hoisting device 9, the bucket bag 5 is raised and lowered along the rail 3 via the wire 11.

Further, the upper end of the rail 3 is connected to the receiving hopper 2.
a guide portion 3a extending substantially horizontally along the upper surface of the
When the bucket 5 rises to this part, the force acting on the bucket 5 from the wire 11 automatically moves the front roller 6 and the rear roller 6 of the bucket 5. is divided into the guide portion 3a and the guide portion 3b and moves, the bucket 5 is tilted, and the powder and granular material in the bucket 5 is discharged into the receiving hopper 2.

Figure 3 shows the structure of the drive unit mounting part.
The drive unit 10 connects the motor 8 and the hoisting device 9 through a chain 16, and connects them to a base frame 17.
The base frame 17 is mounted on the mounting frame 7, and one end of the base frame 17 is supported by the mounting frame 7 via a pivot 18, and the other end can float above the mounting frame 7. A load cell (load detector) 2 is provided on the upper surface of the other end of the base frame 17 and is in contact with a hook-shaped receiving member 19 provided on the mounting frame 7.
0 is attached. This load cell 20 is
A strain gauge is built in, and the load acting on the bucket 5 is detected by detecting the force in the floating direction that the drive unit 10 receives from the wire 11, and a detection signal corresponding to the load is output.

As shown in FIG. 4, this load cell 20 is connected to an overload detection device 21 and a weight measurement device 22. The overload detection device 21 is
By comparing the load detection value by the load cell 20 and the set value 23 for overload judgment, which corresponds to the upper limit of the allowable load, in the comparator 24, it is detected when the load detection value exceeds the allowable load. , motor 8
A stop signal is output to the overload alarm means (not shown) such as a lamp or a buzzer. In addition, the weight measuring device 22 is
Weight detection unit 2 that converts the signal output from the load cell 20 into a signal converted into a weight equivalent value and outputs the signal
5, and a weight display section 26 that receives a signal from the weight detection section 25 and displays the weight.
The weight of the powder and granular material contained in the container is displayed. Note that, in order to improve the detection accuracy, the weight detection by the weight detection section 25 is desirably carried out with the motor 8 temporarily stopped during transport of the powder or granular material.

The operation of the powder elevator having the above structure will be explained next.

After the powder and granules are charged from the input hopper 1 to the bucket 5 at the lower end of the rail 3, the hoisting device 9 is driven by the motor 8, and the bucket 5 is hoisted up via the wire 11.
rises along the rail 3 to convey the powder and granular material.
After the bucket 5 reaches the upper end of the rail 3 and the powder and granules are discharged into the receiving hopper 2 as described above,
The hoisting device 9 is driven in the unwinding direction, the bucket 5 is lowered, and when it reaches the lower end position of the rail 3, the granular material is thrown in again, and then the above-mentioned conveyance operation is repeated.

The powder and granular material is transported in this manner, but during transportation, the load acting on the bucket cart 5 due to the weight of the powder and granular material accommodated in the bucket cart 5 and the movement resistance is transferred by the load cell 20 provided in the drive unit 10. Detected. If the load becomes excessively large due to foreign matter getting caught between the roller 6 of the bucket 5 and the rail 3, increasing movement resistance, etc.,
This is detected by the overload detection device 21 and the motor 8 is stopped. In addition to such overload detection, the weight measurement device 22 can detect the load based on the load detection signal from the load cell 20 by utilizing the fact that the load changes according to the weight of the powder or granular material in the bucket 5. The weight is measured and displayed. Therefore, even if the amount of powder or granular material required for backing up the shell mold changes due to a change in stored items, the amount of powder from the input hopper 1 will be adjusted according to the weight measured by the weight measuring device 22 and the amount used. By adjusting the input amount, the amount of powder or granular material conveyed can be adjusted.

Also, if there is an abnormality in the previous process and the powder or granules are not properly charged into the bucket 5,
This can be determined by measuring the weight using the weight measuring device 22. Note that the weight measuring device 22 provides means for displaying when the bucket 5 is empty due to an abnormality in the previous process.
It may be set in

(Effects of the invention) As described above, the present invention detects the force applied from the pulling cable to a drive unit equipped with a hoisting device that raises and lowers a bucket cart via the pulling cable in a powder elevator. Therefore, a load detector is provided to detect the load, and an overload detection device and a weight measurement device are provided to receive the output of this load detector. Therefore, the output of the load detector can be used to detect overload. It is possible to measure the weight of the granular material being transported. Therefore, countermeasures when an overload is applied during conveyance, adjustment of the conveyance amount based on weight measurement, etc. can be performed with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the overall structure of an embodiment of the present invention, Fig. 2 is an enlarged front view of a part of the rail for lifting and lowering the bucket and the bucket, Fig. 3 is an enlarged side view of the drive unit mounting part, FIG. 4 is a block diagram of the overload detection device and weight measurement device. 3...Bucket lifting rail, 5...Bucket, 6...Roller, 7...Mounting frame, 8...Motor, 9...Hoisting device, 10...Drive unit,
DESCRIPTION OF SYMBOLS 11...Wire (pulling rope), 20...Load cell (load detector), 21...Overload detection device, 22...
...Weighing device.

Claims (1)

[Scope of utility model registration request] Equipped with a rail for lifting and lowering a bucket, a bucket for transporting powder and granular material attached to the rail so as to be able to be raised and lowered via rollers, and a hoisting device that is driven by a motor to raise and lower the bucket via a haul cable,
In an elevator for powder and granular material that transports powder and granular material loaded into a bucket upward, a drive unit equipped with the above-mentioned hoisting device is mounted on the mounting frame in a floating state, and the drive unit and the mounting frame are connected to each other. In between, a load detector is provided to detect the load acting on the bucket by detecting the force that the drive unit receives from the towing rope, and the output of the load detector is used to determine whether the load is an allowable load. for powder and granular material, characterized in that it is provided with an overload detection device that detects the overload when the load is larger, and a weight measurement device that measures the weight of the transported object in the bucket based on the output of the load detector. elevator.