JPH0655239A - Device for automatically separating iron powder from sand - Google Patents

Abstract

PURPOSE:To automatically separate iron powder from sand by controlling the drive of a magnetic separator with signals from both level sensors for discriminating whether the sand mixed with the iron powder is stored or not and whether the iron powder and the sand are filled up or not. CONSTITUTION:In the iron separator 40 for separating the sand mixing the iron powder into the iron and the sand by using a magnet, the level sensor 15 for detecting whether the sand mixed with the iron powder is stored or not and the level sensors 66, 67 for detecting whether the iron powder and the sand are filled up or not, are arranged. Then this device is constituted by providing a controller for controlling the device of the magnetic separator 40 providing the magnetic based on the signals from both sensors. By this method, the sand mixed with the iron powder is separated into the iron and the sand and can automatically be separated in the state of reusable condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron powder / sand automatic sorting apparatus, and more particularly to iron for separating iron powder-containing sand into iron and sand, and automatically sorting them into a reusable state. Relating to improvement of automatic powder / sand sorter.

[0002]

2. Description of the Related Art Conventionally, in the case of shot sand after mineral blasting, which contains a large amount of iron powder, iron powder and sand are clearly separated because the iron powder and sand are attached to the sand. It is difficult to separate, and shot sand cannot be reused and is disposed of as industrial waste. For example, in the casting process, as shown in FIG. 9, the purchased molding sand is mixed and adjusted according to the shape of the mold, the size of the mold, and the like, and then molded, and molten iron is poured into the mold. Forming a casting. After cooling, the mold is unframed and the casting is taken out, and the unframed sand is reclaimed by a sand reclamation device (calciner) and used again for mixed sand. In addition, the cast product that has been unframed may be used as it is after finishing shot casting after applying shots, or,
It has been sent to the next processing step. At this time, iron powder and sand generated in the shot process are disposed of as industrial waste.

[0003]

However, in recent years, there has been a strong demand for prevention of pollution of industrial waste, and especially, the disposal place of industrial waste is reduced and the disposal cost is high. Further, there is a problem that manpower is insufficient in the foundry industry.

The present invention focuses on the above-mentioned conventional problems, and relates to an automatic iron powder / sand sorting apparatus, and in particular, it separates sand mixed with iron powder into iron and sand, and automatically puts them into a reusable state. The purpose is to provide an automatic sorting device for iron powder and sand that is sorted into.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a sand containing iron powder is separated into iron and sand by using a magnet, and iron powder / sand is selected. In the equipment, a level sensor that detects whether or not sand containing iron powder is stored, a level sensor that detects whether or not the selected iron powder and sand are fully stored, and a magnetic separation device that has a magnet based on signals from both sensors. And a controller for driving and controlling the device. In the second invention mainly based on the first invention, a plurality of magnets are arranged in series in the magnetic separation device.

In the third invention, which is mainly based on the first invention, the position of the tank for storing the selected iron powder and sand is at the height at which the transport vehicle enters the lower part.

[0007]

According to the above construction, the magnetic separation device for selecting the sand containing the iron powder by using the magnets arranged in parallel to the conveyer conveys the sand containing the iron powder into the iron and the sand.
What used to be industrial waste can be reused. Also,
The resources can be reused, and because the resources are automatically selected, manpower is not required and costs can be reduced. Moreover, pollution can be prevented because the industrial waste can be reused especially in the present situation where the disposal place is small.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an iron powder / sand automatic sorting apparatus according to the present invention will now be described in detail with reference to the drawings.
FIG. 1 shows an overall configuration diagram showing an embodiment of an automatic iron powder / sand sorting apparatus of the present invention. In FIG. 1, an iron powder / sand automatic sorting apparatus 1 carries a sand containing a large amount of iron generated in a shot process (hereinafter referred to as shot sand 2) into a stockyard 10 and a stockyard 10. The bucket elevator section 20 for transporting the shot sand 2 thus discharged to the intermediate hopper section 30, and the intermediate hopper section 30 for temporarily storing the shot sand 2 carried out from the stockyard section 10.
And a magnetic separation device 40 for selecting shot sand 2 from the intermediate hopper unit 30 into iron powder 3 and sand 4, and a storage tank 50 for storing the iron powder 3 and sand 4 selected by the magnetic separation device 40.
And a control device 80 (which controls the bucket elevator 20 and the magnetic separator 40, etc., which will be described later, such as driving and stopping, based on signals from the sensors arranged in the stockyard 10, the intermediate hopper 30, the storage tank 50, etc. (Shown in FIG. 4).

As shown in FIG. 2, the stockyard portion 10
Is the stockyard body 11 that stores the shot sand 2.
And a gate 12 arranged at a communication port for discharging the shot sand 2 to the bucket elevator section 20 below the stockyard body 11, and an air cylinder 13 for opening and closing the gate 12.
And an electromagnetic switching valve 14 that switches between supply and discharge to the air cylinder 13, and a shot sand 2 at the bottom of the stockyard body 11.
Level sensor 1 that confirms the presence or absence of contact with
It consists of five.

The bucket elevator section 20 transfers the shot sand 2 carried into the stockyard section 10 to the intermediate hopper section 3.
A patrol light that is installed at a bucket elevator 21 that conveys to 0, a motor 22 that drives the bucket elevator 21, and a communication port that communicates with the bottom of the stockyard body 11 below the bucket elevator 21 and that confirms the presence or absence of shot sand 2. 23 and a patrol light 24 for displaying the presence or absence of the shot sand 2.

The intermediate hopper section 30 is arranged at a hopper body 31 for storing the shot sand 2 and a communication port for discharging the shot sand 2 to the magnetic separation device 40 below the hopper body 31, and controls the flow rate of the shot sand 2. Manual flow control gate 32
A gate 33 that controls the carry-out to the magnetic separation device 40 below the flow rate control gate 32, an air cylinder 34 that opens and closes the gate 33, and an electromagnetic switching valve 35 that switches between supply and discharge to the air cylinder 34 (shown in FIG. 4). .), The lower level sensor 36 for confirming the sky by the contact of the shot sand 2 in the lower part of the hopper body 31, the upper level sensor 37 for confirming the fullness in the upper part of the hopper body 31, and the shot sand 2
And a vibrator 38 (shown in FIG. 3) for supplying the magnetic field from the hopper main body 31 to the magnetic separation device 40 substantially uniformly.

The magnetic separator 40 includes a supply conveyor 41 for receiving the shot sand 2 from the intermediate hopper unit 30, a motor 42 for rotating the supply conveyor 41, and a supply conveyor 41.
Magnetic separation conveyor 43 partially arranged in parallel above
And a motor 44 with variable speed for rotating the magnetic separation conveyor 43, and a supply conveyor 41 inside the magnetic separation conveyor 43.
A magnet 45 (shown in FIG. 3) composed of a plurality of N poles and S poles, which are partially arranged in parallel with each other, and a partition plate for separating the iron powder 3 and the sand 4 under the magnetic separation conveyor 43. It consists of 46.

The storage tank 50 is a storage tank 60 for iron powder (hereinafter referred to as an iron storage tank 60) for storing the iron powder 3 and the sand 4 selected by the magnetic separation device 40, and a storage tank 70 for sand ( Hereinafter referred to as a sand storage tank 70). The iron storage tank 60 carries out the tank main body 61 for storing the selected iron powder 3 and the iron powder 3 at the lower part of the tank main body 61 for loading on the carrier 90 or the like that has entered below the iron storage tank 60. Gate 62 installed at the access port
, An air cylinder 63 that opens and closes the gate 62, and an electromagnetic switching valve 64 that switches between supply and discharge to and from the air cylinder 63 (see FIG. 3).
Shown in. ), And a lower level sensor 65 for confirming emptyness by the iron powder 3 coming into contact with the lower part of the tank body 61,
An upper level sensor 66 for confirming that the tank main body 61 is full, and a patrol light 67 for displaying the sky of the iron powder 3,
It is composed of a patrol light 68 for displaying the fullness of the iron powder 3.

Similarly, the sand storage tank 70
Is a gate provided in the tank main body 71 for storing the selected sand 4 and a gate under the tank main body 71 for carrying out the sand 4 for loading the sand 4 on a transport vehicle or the like that has entered below the sand storage tank 70. 72, an air cylinder 73 that opens and closes the gate 72, an electromagnetic switching valve 74 (shown in FIG. 3) that switches between supplying and discharging to and from the air cylinder 73, and confirmation of emptyness by contacting the sand 4 under the tank body 71. A lower level sensor 75, an upper level sensor 76 for confirming the fullness of the upper part of the tank body 71, a patrol light 77 for displaying the sky of the sand 4, and a patrol light 78 for displaying the fullness of the sand 4.
It consists of

As shown in FIG. 4, the control unit 80 drives the bucket elevator unit 20, the magnetic separation unit 40 and the like by signals from the sensors provided in the stockyard unit 10, the intermediate hopper unit 30, the storage tank 50 and the like. The controller 81 performs control described later such as stop and the like. FIG. 4 shows a block diagram of the controller 80. The controller 81 of the control device 80 includes a level sensor 1 for stockyard.
5, elevator patrol light 23, lower part sensor for intermediate hopper (hereinafter, lower part indicates empty) level sensor 36, upper part for intermediate hopper (hereinafter, displayed full) level sensor 37, lower level sensor for storage tank iron 65,
The signals from the storage tank iron upper level sensor 66, the storage tank sand lower level sensor 75, and the storage tank sand upper level sensor 76 are input.

From the controller 81, excitation / demagnetization 49 of the magnet 45, elevator patrol light 24, stockyard gate solenoid switching valve 14, elevator drive motor 22, intermediate hopper gate solenoid switching valve 35, supply conveyor drive motor 42. , Magnetic selection belt drive motor 44, storage tank iron gate solenoid switching valve 64, storage tank sand gate solenoid switching valve 74, storage tank iron lower patrol light 67, storage tank iron upper patrol light 68, storage tank sand lower patrol light 77 , The storage tank sand upper patrol light 78 is output.

Further, the controller 81 is provided with a switch 82 for automatic operation and a switch 83 for manual operation. Further, the switch 83 for manual operation includes the stock yard gate solenoid switching valve 14, the elevator drive motor 22, the intermediate hopper gate solenoid switching valve 35, the supply conveyor drive motor 42, the magnetic selection belt drive motor 44,
Storage tank iron gate solenoid switching valve 64, storage tank sand gate solenoid switching valve 74, switches 83a, 83b, ...
3n are provided. Further, the controller 61 is
It consists of RAM, ROM, and CPU.

In the above description, the level sensor for the stockyard, the patrol light and the like are distinguished, but one sensor may be used, and the gate of the intermediate hopper may be opened and closed or the flow rate may be controlled by one gate. You may change it in consideration of the maintenance and inspection without being restricted by the above.
Further, although the controller is used for the control in the above-described embodiment, the control can be performed using parts such as a relay and a limit switch. For example, a limit switch may be provided in the cylinder used for the gate to detect the stroke for control, and the controller and the above components may be used together.

Next, the operation of the above structure will be described. 5 and 6 show flowcharts of the automatic sorting apparatus. In step 1, shot sand 2 is carried into the stockyard. In step 2, to start the sorting work,
For example, the worker "turns on" the switch 82 for automatic operation.
Put in. In step 3, the signal from the level sensor 15 for the stockyard causes the stockyard main body 11 to move.
If it is empty, go to step 1 and carry shot sand 2 into the stockyard. If the shot sand 2 is present, it is determined in step 4 whether or not the elevator patrol light 23 signal is empty, and if it is empty, the process returns to step 3 to check again. If it is empty, a signal is sent to the stockyard patrol light 24 to indicate that the stockyard main body 11 is empty. The steps 3 and 4 may be detected by the same sensor to form one step, but the present invention uses two steps in consideration of safety.

If there is shot sand 2 in step 4, in step 5 the storage tank 5 for iron and sand
It is determined whether or not 0 is full according to the signals from the storage tank iron upper level sensor 66 and the storage tank sand upper level sensor 76. If it is full, go to step 6 and the automatic operation switch is turned on, but the operation is stopped and at step 7, the storage of the full storage tank for iron and sand 50 is completed. Signals are output to the tank iron upper patrol light 68 and the storage tank sand upper patrol light 78, for example, by turning on the blue light of the patrol light to notify the operator that it is full.

If the hopper body 31 of the intermediate hopper unit 30 is not full in step 5, the signal from the upper level sensor 37 is used to determine whether or not the hopper body 31 of the intermediate hopper portion 30 is full. If the hopper body 31 is not full, in step 9, a signal is sent to the elevator drive motor 22 of the bucket elevator 21 to start the rotation of the elevator. In step 10, a signal is sent to the electromagnetic switching valve 14 that switches between supply and discharge to and from the air cylinder 13 to operate the air cylinder 13 to open the gate 12 provided at the communication port that is carried out to the bucket elevator unit 20. The transportation of the shot sand 2 to the section 30 is started. In step 11, it is determined whether or not the hopper main body 31 is empty, and if it is not empty, in accordance with a command from the controller 81, the magnet 45 is
To send a signal to excite.

Also, when step 8 is full, similarly, step 1 is followed to step 12 in which the magnet 45 is excited.
At 3, a signal is sent to the magnetic separation belt drive motor 44 to rotate the magnetic separation belt. In step 14, a signal is sent to the supply conveyor drive motor 42 to rotate the supply belt. In step 15, the vibrator 38 that supplies the shot sand 2 almost uniformly onto the supply belt is operated, and a signal is sent to the electromagnetic switching valve 35 that switches the supply and discharge to and from the air cylinder 34, and the air cylinder 34 is operated to operate the gate. 33 is opened, and shot sand 2 is supplied almost uniformly onto the supply belt.

As a result, as shown in FIG. 3, the shot sand 2 is supplied onto the supply belt and is sent in the direction to the magnetic separation belt by the rotation of the belt. When the shot sand 2 on the supply belt passes through the magnet 45 composed of a plurality of excited N and S poles, the iron powder 3 adheres to the lower side of the magnetic separation conveyor 43 by a strong magnetic force, The shot sand 2 on the supply belt from which the iron powder 3 sent in the partitioning direction is removed by the rotation of the magnetic separation conveyor 43 is only sand 4, and is stored in the sand storage tank 70 from the end surface. The iron powder 3 attached to the lower side of the magnetic separation conveyor 43 is carried by the magnetic separation conveyor 43 with a strong magnetic force, but there is no magnet 45 past the partition of the sand storage tank 70, and the magnetic separation conveyor 43 is present. Iron powder 3 separates from iron storage tank 6
Stored in 0.

In step 16, the sand storage tank 7
It is determined whether or not the sand 4 is full by the signal from the upper level sensor 76 arranged on the upper part of the tank main body 71 of 0. If it is not full, go to step 17. Proceeding to step 17, the upper level sensor 6 arranged on the upper part of the tank body 61 of the iron storage tank 60.
A signal from 6 determines whether or not the iron powder 3 is full. If it is not full, go back to step 8.

If it is full in step 16 or step 17, the process proceeds to step 18 and the controller 81
The vibrator 38 is stopped in response to a signal from the above, and a signal is also sent to the electromagnetic switching valve 35 that switches between supply and discharge to the air cylinder 34 to operate the air cylinder 34 and close the gate 33.

In step 19, a signal is sent to the supply conveyor drive motor 42 to stop the supply belt. In step 20, a signal is sent to the magnetic separation belt drive motor 44,
Stop the magnetic separation belt. In step 21, the magnet 45
Demagnetize by sending a signal to demagnetize. In step 22, a signal is sent to the electromagnetic switching valve 14 that switches between supply and discharge to the air cylinder 13 to operate the air cylinder 13 and carry out to the bucket elevator section 20.
Close 2

In step 23, a signal is sent from the controller 81 to the elevator drive motor 22 of the bucket elevator section 20, for example, the bucket elevator 21 is rotated at least one extra rotation, and the intermediate hopper section 30 is shot sand. 2 is conveyed, the bucket elevator 21 is shelled, and then the rotation is stopped. In step 24, a signal is output to the storage tank iron upper patrol 68 and the storage tank sand upper patrol 78 of the full iron and sand storage tank 50, for example, by lighting the blue patrol light. Notify workers that they are full.

In the above embodiment, the shot sand 2 is loaded into the intermediate hopper section 30 and unloaded from the intermediate hopper section 30.
Manual flow rate control gate 3 to control the flow rate of shot sand 2
The controller 81 controls the number of revolutions of the elevator drive motor 22, the number of revolutions of the supply conveyor drive motor 42, and the flow rate of the shot sand 2 from the flow rate control gate 32 by the controller 81, and the intermediate hopper. Shot sand 2 in part 30
May be controlled so that a predetermined amount is stored.

When the iron and sand storage tanks 50 are full, a truck or other transport vehicle can easily enter below the storage tank 50 so that they can be easily loaded on the transport vehicle. Further, in the above embodiment, the stockyard 10 and the intermediate hopper 30 are provided, but the shot sand 2 may be directly conveyed to the intermediate hopper 30.

In this case, as shown in FIG. 8, in step 101, shot sand 2 is carried into the stockyard. In step 102, for example, an operator turns on the switch 82 for automatic operation to "ON" to start the sorting work. In step 3, the hopper body 31 of the intermediate hopper unit 30 is emptied by the signal from the lower level sensor 36,
Determine whether or not. If the hopper body 31 is empty, the process proceeds to step 101 and the shot sand 2 is carried into the stockyard.

If the storage tank 50 for iron and sand is not empty, it is determined whether or not the storage tank 50 for iron and sand is full by the signals from the storage tank iron upper level sensor 66 and the storage tank sand upper level sensor 76. To judge. If it is full, as above,
In step 105, the automatic operation switch is "ON", but the operation is stopped, and in step 104, the storage tank iron upper patrol light of the full storage tank 50 for iron and sand. 6
8 and a signal to the storage tank sand upper patrol light 78 is output, for example, by lighting the patrol light in blue to notify the operator that it is full. If it is not full, the same control is performed except for steps 22 and 24 of steps 12 to 25 of the above-mentioned embodiment.

[0032]

As described above, according to the present invention,
As shown in Fig. 7, shot sand, which has been treated as industrial waste in order to reliably separate iron and sand containing iron powder, is regenerated by a sand reclaiming device to be mixed sand, and iron powder is countered. Resources can be reused for weights, etc., and humans are not required because they are automatically selected. In addition, there is an excellent effect that a place for disposing of industrial waste is unnecessary, pollution can be prevented, and disposal costs are unnecessary.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of an iron powder / sand automatic sorting apparatus of the present invention.

FIG. 2 is a conceptual diagram showing the arrangement of sensors in the iron powder / sand automatic sorting apparatus of the present invention.

FIG. 3 shows a block diagram of an iron powder / sand magnetic separator according to the present invention.

FIG. 4 shows a block diagram of a control device 80 of the present invention.

FIG. 5 shows a flowchart of the first embodiment of the present invention.

FIG. 6 shows a flowchart of the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a process of the iron powder / sand magnetic separation device in the casting process of the present invention.

FIG. 8 shows a flow chart of a second embodiment of the present invention.

FIG. 9 is a diagram illustrating a process in a conventional casting process.

[Explanation of symbols]

 10 stockyard 15 level sensor for stockyard 20 bucket elevator 30 intermediate hopper 40 magnetic separator 66 storage tank iron upper level sensor 76 storage tank sand upper level sensor 80 controller 81 controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuyuki Kobayashi 400 Yokokura Nitta 400, Oyama City, Tochigi Prefecture Komatsu Factory Oyama Factory

Claims (3)

[Claims] 1. A level sensor for detecting the presence / absence of storage of sand mixed with iron powder, and a sorting device for separating sand containing iron powder using a magnet to separate iron and sand using a magnet. Of iron powder and sand, characterized by comprising a level sensor for detecting whether or not the stored iron powder and sand are full, and a controller for driving and controlling a magnetic separation device having a magnet by signals from both sensors. Automatic sorting device. 2. The iron powder / sand automatic sorting apparatus according to claim 1, wherein a plurality of magnets are arranged in series in the magnetic sorting apparatus. 3. The automatic iron powder / sand sorting apparatus according to claim 1, wherein the tank for storing the sorted iron powder and sand is located at a height at which a transport vehicle can enter the lower portion.