JPS5917700B2 - Powder continuous transport equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a continuous transport device for powder and granular materials.

In particular, even if the supply speed of powder and granules sent from the previous process changes, continuous transportation is continued without wasting or stagnation of air, which is the cushion or transportation medium for high-density transportation of powder or granules in pipes. This invention relates to a device for continuous transportation of powder and granular materials.

Conventionally, granulated powder particles that are extremely easily crushed are often unsuitable for transportation due to their large amount of crushing during general pneumatic transportation.

Therefore, in many cases, they were transported using belt conveyors, etc.

However, when the powder is transported by a belt conveyor or the like, the physical force of the powder comes into direct contact with the outside air, which may cause dust to fly around and worsen the working environment.

Furthermore, when the powder is hygroscopic, it absorbs water and adheres to the surface of the belt conveyor, resulting in deterioration of product quality and burden on the maintenance of the belt conveyor.

In addition, as a means of transportation to improve these drawbacks, a technology for transporting powder and granular materials in pipes has been developed, making it possible to transport various powder and granular materials to long distances without deteriorating the working environment. ing.

This method involves sending high-pressure air in pulses to transport the powder to a low-pressure receiving tank.

However, since this method transports the powder and granules in a pipe, troubles tend to occur when the supply rate of the powder and granules is not constant.

In other words, when the powder supply speed changes and becomes smaller,
This may result in empty air feeding or inefficient transportation.

In addition, there are disadvantages such as the pipe becomes clogged and does not work if the supply speed changes and the pipe becomes thick.

Therefore, it is conceivable to deal with the above-mentioned drawbacks by adjusting the air flow rate every time the powder supply rate changes.

However, if the feeding speed of powder or granular material changes frequently,
This is extremely inconvenient because the air flow velocity must be adjusted each time.

The present invention improves this by automatically controlling the supply speed of powder and granular material during pipe transportation to the subsequent process even when the feeding speed of powder and granular material sent from the previous process changes frequently. The purpose of the present invention is to provide a device for continuously transporting powder and granular materials.

The present invention comprises: a hopper connected to a powder outlet in a previous step via a first valve; a blow tank connected to a powder outlet of the hopper via a second valve; a pulse air drive unit provided between the powder and granular material outlet of the blow tank and the transport pipe; a detection means for detecting that a certain amount of powder and granular material has been stacked in the hopper; The apparatus is characterized by comprising means for controlling the amount of air sent out by the time pulse air drive unit in accordance with the time it takes for the powder and granular material in the hopper to reach the predetermined volume after the valve is closed.

Furthermore, a second invention provides, in addition to the first invention, a second detection means for detecting an upper limit level and a lower limit level of the particle stacking surface in the blow tank, and a detection means for the second detection means. The present invention is characterized in that it also includes means for controlling the amount of air sent out by the pulse air drive unit according to the output.

Next, embodiments will be described based on the drawings.

The figure is a configuration diagram of an apparatus according to an embodiment of the present invention.

The blow tank 1 becomes narrower at the bottom and is connected via a pulse air drive unit 2 to a transportation piping 3 for a subsequent process.

An upper level switch 4 is installed on the side wall of the blow tank 1 to indicate the upper limit level of the layered surface of the powder and granules in the blow tank 1.
and a lower level switch 5 for setting the lower limit level are respectively attached.

The upper part of the blow tank 1 is connected to the outlet of the input hopper 6 and is partitioned off by a valve 7.

A level switch 8 is attached to the side wall of the input hopper 6 to detect a layered surface formed by stacking a certain amount of powder or granules within the input hopper 6.

The upper part of the input hopper 6 is connected to a pre-processing device 9, and is partitioned off by a valve 10.

The outputs of the level switches 4, 5, and 8 are given to a control device 11, and the output of this control device 11 is connected to a flow rate control section 12 that controls the flow rate of air.

The control device 11 controls the time from when the valve 10 that partitions the input hopper 6 and the pre-process device 9 is opened until the laminated surface formed by stacking the powder and granules in the input hopper 6 reaches the level switch 8. is measured, the amount of air to be sent to the pulse air drive section 2 is calculated from the measured time, and the flow rate control section 12 is controlled.

The control device 11 also receives detection outputs from the level switches 4 and 5.

The flow rate control unit 12 operates according to instructions from the control device 11 described above.
It is constructed so that the air flow rate from a compressor (not shown) can be adjusted.

On the other hand, a portion of the air from a compressor (not shown) is supplied to the flow rate control section 12, and is piped to be supplied to the pulse drive section 2 via a valve 13.

Furthermore, air from the compressor is piped so that it can be sent to the blow tank 1 via a valve 14 and to the input hopper 6 via a valve 15, respectively.

In addition, the blow tank 1 and input hopper 6 are connected to a valve 16.
The input hopper 6 is connected by piping through a valve 17, and an exhaust piping is connected from the upper part of the input hopper 6 through a valve 17.

These pipes passing through the valves 16 and 17 are pipes for air to be appropriately replaced or discharged so that the powder or granules can be stacked or moved into the input hopper 6 or into the blow tank 1. be.

Next, the operation of the device configured in this way will be explained.

First, the valve 7 is closed and the valve 10 is opened.

When powder and granules are sent from the previous process device 9 in this state, the powder and granules are stacked in the input hopper 6.

When the upper surface of the stack reaches the level switch 8 and this is detected, the valve 10 is closed for a short time and the valve 7 is opened.

During this short period of time, the powder and granules stacked in the input hopper 6 fall into the blow tank 1.

When all the powder and granular material stacked in the input hopper 6 falls, the valve 7 is closed again and the valve 10 is opened.

In this state, the granular material sent from the device 9 in the previous process is also received into the input hopper 6.

When this operation is repeated, valve 7 closes and valve 1 closes.
The time from when the 0 is opened until the upper surface of the stack of powder and granules reaches the level switch 8 is inversely proportional to the speed at which the powder and granules are sent from the device 9 in the previous process.

Therefore, the control device 11 measures this time, and when this time is short, the speed at which the powder and granules are sent is high, so the flow rate control section 12 is set to send a large amount of air to the pulse air drive section 2. Control.

On the other hand, when the above-mentioned time is long, the speed at which the powder or granular material is sent is low, so the flow rate control section 12 is controlled to send a small amount of air to the pulse air drive section 2.

As a result, the amount of powder and granules remaining in the blow tank 1 is kept almost constant, that is, the powder and granules are transported through the pipe automatically according to the speed of the powder and granules sent from the device 9 in the previous process. You will be killed.

Further, since the blow tank 1 has a certain capacity, even if the speed of the powder material sent from the device 9 in the previous process changes rapidly, this change can be absorbed and averaged out.

Further, normally, the operation is performed such that the stacking surface of the powder and granular material dropped into the blow tank 1 from the input hopper 6 in the blow tank 1 is located between the level switches 4 and 5.

However, when the laminated surface is higher than the level switch 4, the control device 11 instructs the flow rate controller 12 to increase the air flow rate based on the signal detected by the level switch 4, and the laminated surface is lower than the level switch 4. When the air flow rate is lower than position 5, the control device 11 instructs the flow rate control unit 12 to reduce the air flow rate based on the signal detected by the level switch 5.

In this way, the flow rate control section 12 is normally controlled by the detection output of the level switch 8 of the input hopper 6.

On the other hand, the above-mentioned level switches 4 and 5 are provided auxiliary to the above-mentioned level switch 8. For example, when the detection output of the level switch 8 is abnormal, the flow control section 12 is controlled by the detection outputs of level switches 4 and 5.

In this way, the air sent from the compressor (not shown) is sent to the pulse air drive section 2 with its flow rate controlled by the flow rate control section 12, and is pulsed to send the powder into the transportation pipe 3. , transported to subsequent processes.

As explained above, according to the apparatus of the present invention, even if the supply speed of the powder or granular material sent from the previous process changes frequently, air is automatically supplied in a pulsed manner according to the supply speed. Can be sent.

Thereby, it is possible to carry out continuous transportation in which the supply rate in the pipe transportation of the powder or granular material to the subsequent process is appropriately controlled.

Therefore, if the supply speed of the powder or granular material from the previous process is reduced, the pulsed air is also sent at a smaller rate, so that a state of high-density transportation without air feeding can be continued.

Furthermore, if the powder supply speed increases, more pulsed air is sent, which can prevent clogging in the pipe.

In the above-mentioned embodiment, the case where there is one input hopper connected to the upper part of the blow tank has been described, but two or more input hoppers may be arranged in parallel.

For example, when two input hoppers are installed in parallel at the top of the blow tank, while the valve of one input hopper is closed, the powder particles from the previous process can be removed by opening the valve of the other input hopper. The body can be received and placed alternately in two hoppers.

This makes it possible to more accurately detect the receiving speed of powder and granular material even when the powder and granular material from the previous process is sent at extremely high speeds, making it possible to effectively and continuously transport powder and granular material with high precision. can.

[Brief explanation of the drawing]

The figure is a configuration diagram of an apparatus according to an embodiment of the present invention. 1...Blow tank, 2...Pulse air drive unit,
3...Transport piping, 4,5.8...Level switch,
6...Input hopper? , 10, 13, 14, 15゜1
6.17...Valve, 9...Pre-process equipment, 11...
-Control device, 12...Flow rate control section.

Claims (1)

[Claims] 1. A hopper 6 connected to the powder and granular material outlet of the previous process via a first valve 10, and a second valve 7 connected to the powder and granular material outlet of this hopper. a blow tank 1, a pulse air drive unit 2 provided between the powder outlet of the blow tank and the transport pipe, and a pulse air drive unit 2 that detects that a certain amount of powder and granules are stacked in the hopper. The first detection means and the second valve 7 are closed, and depending on the time required for the powder and granular material in the hopper to reach the fixed volume, if this time is short, the air flow rate is increased. A continuous powder transport device is provided with a means for controlling the amount of air sent out from the pulse air drive unit so that the air flow rate is reduced when the air flow rate is long. 2. A hopper 6 connected via a valve 10, a blow tank 1 connected to a powder outlet of this hopper via a second valve 7, and a powder outlet of this blow tank and transport piping. a pulse air drive unit 2 provided between the hopper, a first detection means for detecting that a certain amount of powder is stacked in the hopper, and an upper limit of the powder stacking surface in the blow tank. a second detection means for detecting the level and the lower limit level; and a second detection means for detecting the level and the lower limit level; If this time is long (°C), the air flow rate should be reduced, and if the second detection means detects that the layered surface of the powder has reached the upper limit level, the air flow rate should be reduced. and controlling the amount of air sent out by the pulse air drive unit so as to reduce the air flow rate when the second detection means detects that the layered surface of the powder has reached the lower limit level. 3. The powder continuous transport device according to claim 2, characterized in that at least two input hoppers are provided in parallel in the upper part of the blow tank. Continuous particle transport device.