JPH1060811A - Powder force-conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder force-conveying device capable of knowing the conveyance abnormality and a stop-up position in the case powder is conveyed. SOLUTION: A pressure sensor 6 for detecting conveying pressure is provided to a conveying pipe 2 placed between a powder conveying siro 4 and a powder force-conveying blower 3. When pressure detected by the pressure sensor 6 is remarkably high, the conveyance abnormality is caused by stop-up of the coveying pipe 2, and when pressure detected by the pressure sensor is remarkably low, it is caused by stop-up of the supply siro 4 or a rotary valve 5. Alarms are given to the force conveyance abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, pressure feeding of stone powder and dust in an asphalt mixture production plant,
The present invention relates to a powder pumping apparatus for air-feeding various powders such as a cement pump in a ready-mixed concrete manufacturing plant.

[0002]

2. Description of the Related Art Conventionally, for powder feeding in a silo, a pressure feeding pipe is disposed between a cut-out portion of a powder feeding silo and a powder supply destination, and is disposed at one end of the pressure feeding pipe. While the air for pumping is sent into the piping by the blower, the powder in the silo is cut out by a rotary valve by a predetermined amount,
The air is sent to the supply destination together with the compressed air.

[0003]

However, in the above-mentioned conventional powder feeding apparatus, although the blower operates normally, the powder is clogged in the pressure feeding pipe to block the pipe. Also, the powder may not be supplied normally due to solidification near the outlet of the powder supply silo or in the rotary valve, but the operator cannot accurately grasp the cause of the pressure feeding abnormality or the clogged portion. Inspection of the device was conducted to search for an abnormal point.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a powder feeding apparatus capable of roughly grasping a powder feeding abnormality during powder feeding and a clogged portion of the powder by detecting a feeding pressure.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a powder feeding method in which powder in a powder feeding silo is fed through a blower and a powder feeding pipe. In the apparatus, a pressure sensor for detecting a pumping pressure is provided in a pumping pipe located between the blower and the powder supply silo, and the detected pumping pressure is compared with a set pressure value to check for powder pumping abnormality and clogging. The feature is that the location can be grasped.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the powder feeding device of the present invention,
The pumping pressure during powder feeding is detected by a pressure sensor installed in the powder pumping pipe located between the blower and the powder supply silo, and when the pumping pressure becomes higher than the normal set pressure value, pumping is performed. When the pumping pressure drops below the set pressure value, an alarm will be issued for the pumping abnormality due to clogging near the outlet of the powder supply silo or the rotary valve. Emit. If the clogged portion can be roughly known in this way, the operator can take quick action without panic.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a powder feeding device of the present invention, wherein a roots blower 3 capable of obtaining a high static pressure is connected as a blower to a distal end portion of a pressure feeding pipe 2 for feeding powder, and a tip portion thereof is provided. Is connected to the powder supply destination. A powder supply silo 4 for supplying powder is arranged in the middle of the pressure feeding pipe 2 via a rotary valve 5.

The powder supply silo 4 and the roots blower 5
A pressure sensor 6 for detecting a pumping pressure is arranged in the pumping pipe 2 positioned between the pressure feed pipes, and the detected pressure signal is taken into an operation panel 7, and the pressure signal value is analyzed to determine that the powder pressure is abnormal and the powder is clogged. Analyze the location.

That is, in a steady operation in which the powder feeding is smoothly performed, if the pumping pressure detected by the pressure sensor 6 is, for example, about 1900 mm to 2600 mmAq, the pumping pipe 2 is closed. Then, the pumping load increases and the detected pressure rises to about 3000 mmAq. Therefore, if the detected pressure becomes an abnormally high value, it is possible to specify that the pressure feeding is abnormal due to the clogging of the pressure feeding pipe 2.

When the powder is clogged in the powder supply silo 4 or the rotary valve 5 and cannot be cut out normally, the pumping load is reduced and the detected pressure is 1100 m.
Since the pressure drops to about mAq, if the detected pressure becomes an abnormally low value, it is possible to identify a pressure feeding abnormality due to clogging in the powder supply silo 4 or the rotary valve 5.

If the pressure sensor 6 is disposed in the pressure feed pipe 3 located between the powder supply silo 4 and the roots blower 5 as described above, the clogged portion may be pressed by the pressure sensor 6 due to an abnormal condition of the detected pressure value. Whether it is in the pipe 2 or in the powder supply silo 4 or the rotary valve 5 can be specified.

Therefore, the upper and lower limits of the pumping pressure during normal operation are set and stored in the operation panel 7,
The pressure value detected by the pressure sensor 6 is compared with the set pressure value. If the detected pressure value exceeds the upper limit value, an alarm is issued that the powder pressure feeding pipe 2 is clogged due to clogging of the powder pressure feeding pipe 2, and the detected pressure value is lower than the lower limit value. If the value is lower than the predetermined value, a warning is issued that the powder feeding silo 4 or the rotary valve 5 is clogged with the pressure feeding abnormality.

If it is possible to know the location of the clogging at the same time as the warning of the abnormal pumping, the operator can quickly deal with the trouble without panic.

As a pressure blower used in the present invention, a roots blower is preferable, and a turbo blower is not preferable because clogging and pressure are not proportional.

[0016]

As described above, in the powder pressure feeding device according to the present invention, the pressure sensor for detecting the pressure of pressure is provided in the powder pressure feeding pipe located between the blower and the powder feeding silo. By comparing the detected pumping pressure with the set pressure value, it is possible to grasp the powder pumping abnormality and the clogged point, so that the operator can know the clogged point at the same time as the pumping abnormality, and the operator can troubleshoot without panic Can respond quickly.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of a powder pressing device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Stone powder feeding device 2 ... Powder pressure feeding pipe 3 ... Roots blower 4 ... Powder supply silo 5 ... Rotary valve 6 ... Pressure sensor 7 ... Operation panel

Claims (1)

[Claims] In a powder feeding apparatus for feeding powder in a powder supply silo through a blower and a pressure feeding pipe, a powder feeding pipe positioned between the blower and the powder feeding silo is provided. A powder pressure feeding device, comprising a pressure sensor for detecting a pressure to be fed, and comparing the detected pressure with a set pressure value so as to be able to ascertain a powder pressure abnormality and a clogged portion.