JP2837631B2 - Powder weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder measuring device.

[0002]

2. Description of the Related Art Powders such as carbon black and zinc white, which are typical additives to rubber, are automatically weighed by a powder weighing device and then charged into a Banbury mixer. Although such powders are granulated, the granules are crushed in the transfer line to the equipment to produce fine powder, and the fine powder gradually spreads on the metal powder contact inner wall of the powder measuring device. Adhere to. And, since the adhesion of the fine powder increases every day, it causes bridging troubles such as poor flow of the powder, stoppage of the flow and deterioration of the measurement accuracy.

Conventionally, in order to prevent such a bridging trouble, a powder weighing apparatus has been configured so as to mechanically vibrate an inner wall with which powder is in direct contact to drop fine powder attached to the inner wall. The device was known.

[0004]

However, in the above-mentioned conventional powder weighing apparatus, the adhesion of fine powder sometimes remains locally, and the occurrence of bridging troubles cannot be completely prevented. In addition, mechanical vibration may cause a failure or breakage of the weighing device, a deterioration in weighing accuracy, or the like.

Accordingly, the present invention has been made to solve the above-mentioned problems and to provide a powder weighing apparatus capable of completely preventing a bridge trouble without causing a failure, breakage, deterioration of weighing accuracy and the like of the weighing apparatus. Aim.

[0006]

To achieve the above object, according to the Invention The powder metering device according to the present invention, a powder meter, the powder
A powder supply path for feeding powder to the body measuring device, and the powder measuring device
And a powder conveying path for discharging the powder from the outside to the outside
In the weighing device, the heating maintained at the specified heating and holding temperature
A heat insulation room is provided, and the powder meter is provided in the heat insulation room.
And the entire powder supply path and the powder transport path.
Is further disposed inside the above-mentioned heat insulation room and above
One or more of the powder weigher, powder supply path, and powder transport path
At a predetermined location in
A local heater for maintaining the heating temperature of
A double heating structure comprising the above-mentioned heat insulation room and a local heater;
It was done.

Further, the powder is carbon black,
In addition, the heat insulation temperature of the heating insulation room is maintained at 45 ° C to 55 ° C.
And the heating temperature of the local heater is 65 ° C to 75 ° C
And the local heater is installed in the powder conveying path.
Weighing damper and wind pressure damper
You.

[0008] Also, the powder is a zinc oxide, and is maintained at a heating retained temperature of the heating insulation chamber 45 ° C. to 55 ° C. has Rutotomoni, the heating temperature of the local heater, 65 ° C. to 75 ° C. Maintained in
It is further該局unit heater, provided in the powder supply channel
I have.

[0009]

According to the first aspect of the present invention, it is possible to prevent powder from adhering to substantially all of the powder measuring device, the powder supply path, and the powder transport path. In addition, the local heater can locally prevent adhesion of a portion where powder easily adheres (a predetermined portion in one or more of the powder meter, the powder supply path, and the powder transport path). In addition, only the portion to which powder easily adheres is heated at a relatively high temperature by a local heater, and the other portions are heated at a relatively low temperature in a heating and insulated chamber, so that no wasteful energy is used. .

[0010] (According to claim 2 ) By the heating and heat retaining room,
In addition to preventing carbon black from adhering, denaturation can also be prevented. Furthermore, the local heater can reliably prevent the carbon black from adhering to the metering damper unit and the wind pressure damper unit provided in the powder conveying path to which the powder easily adheres.

[0011] (According to claim 3 ) By the heat insulation room,
The adhesion of zinc white can be prevented, and the denaturation can also be prevented.
Further, the local heater can surely prevent the adhesion of zinc white on the measuring damper portion and the wind pressure damper portion to which the powder easily adheres.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

In FIG. 1, reference numeral 1 denotes a powder measuring device according to the present invention, and this device 1 is for continuously measuring carbon black as powder (granulated powder). Powder measuring device 2 for temporarily storing powder for measurement, and a powder supply path 3 for feeding powder into the powder measuring device 2
And a powder conveying path 4 for discharging the powder from the powder measuring device 2 to the outside.

An upstream side of the powder supply path 3 is connected with a silo 5 for carbon black. Further, a screw feeder 11 is provided downstream of the powder supply path 3, and the screw is driven to rotate by a motor M of the screw feeder 11, and the powder is put into the measuring device 2.

The powder conveying path 4 is provided with an upstream measuring damper section 12 and an intermediate wind pressure damper section 13. Further, the downstream side of the powder conveying path 4 is connected to the Banbury mixer 6 in communication, and a predetermined weight of carbon black weighed by the powder weighing device 2 is introduced into the mixer 6.

The powder weighing apparatus 1 is provided with a heating means 8 for heating the contact inner wall portions 2a, 3a, 4a with which the powder directly contacts to a predetermined temperature α. The heating means 8
Is a heating and warming chamber 9 maintained at a predetermined heating and warming temperature β.
And local heaters 10 and 10 for maintaining a predetermined heating temperature γ higher than the heating and keeping temperature β of the heating and keeping chamber 9.

As shown by a two-dot chain line, the heat insulation chamber 9 is provided substantially all around the powder meter 2, the powder supply path 3, and the powder conveyance path 4 so as to surround it. In other words, inside the heat insulation room 9
Next, the entire powder measuring device 2, the powder supply path 3, and the powder conveyance
Almost the entire road 4 is provided. In addition, this heating insulation room 9
Is a copper pipe (not shown) through which a mixed fluid of steam and water flows to dissipate heat, and a temperature at which the temperature or flow rate of the fluid flowing through the copper pipe is adjusted to maintain the room temperature within a predetermined temperature range. Control means.

The local heaters 10 and 10 are connected to the powder conveying path 4.
Are attached to the measuring damper section 12 and the wind pressure damper section 13. In addition, local heaters 10 are further provided (if necessary) at predetermined required locations of the powder measuring device 2, the powder supply path 3, and the powder transport path 4. In other words, inside the heat insulation room 9
One of the powder measuring device 2, the powder supply path 3, and the powder transport path 4
At the specified location above, the specified temperature higher than the heat insulation temperature
A local heater 10 for maintaining the heating temperature of
And a double heating system comprising a heating insulation room 9 and a local heater 10.
Structure. The local heater 10 is wound around each peripheral wall of the measuring damper unit 12 and the wind pressure damper unit 13 and has a heating pipe 14 through which a mixed fluid of steam and water flows, and a fluid pipe flowing through the pipe 14. External temperature control means for maintaining the heating temperature γ within a predetermined temperature range by adjusting the temperature or the flow rate.

Thus, the heating and keeping temperature β of the heating and keeping room 9
Is maintained at 45 ° C. to 55 ° C., and the local heater 10,
The heating temperature γ of 10 is maintained at 65 ° C to 75 ° C. That is, the powder meter 2, the powder supply path 3, and the powder transport path 4 have substantially the entirety of 45.
C. to 55.degree. C. and the metering damper section 12 and the wind pressure damper section 13 are at 65.degree. C. (at a higher temperature)
Maintained at ~ 75 ° C.

As a result, the fine powder of carbon black generated at the time of powder transport adheres to the contact inner wall portions 2a, 3a, 4a of the powder meter 2, the powder supply path 3, and the powder transport path 4. Can be prevented. In particular, a weighing damper that is likely to adhere
Since the local heaters 10 and 10 maintain the temperature of the 12 and the wind pressure damper unit 13 higher than those of other parts, it is possible to reliably prevent the fine powder of carbon black from adhering. Therefore, it is possible to prevent the occurrence of bridge troubles such as poor flow of carbon black (powder), stoppage of flow, and deterioration of measurement accuracy.

In addition, the heating and keeping temperature β of the heating and keeping room 9 is:
The heating temperature γ of the local heaters 10, 10 is maintained at a temperature lower than the temperature at which denaturation such as dissolution, ignition, softening, and crushing of granulation occurs, so that denaturation of carbon black can be prevented. Further, a portion where a bridging trouble is relatively unlikely to occur is heated in the heat insulation chamber 9 and a portion where a bridging trouble easily occurs (a weighing damper portion).
12 and the wind pressure damper section 13) have a double heating structure in which the heating is locally heated at a temperature higher than the heating insulation temperature β of the heating insulation chamber 9, so that energy is not wasted and is reasonable. .

It should be noted that the heating and keeping temperature β of the heating and keeping room 9 is
The heating temperature γ of the local heaters 10, 10 can be appropriately changed in the range of 40 ° C. to 90 ° C. other than the above-mentioned temperature. That is,
The predetermined temperature α of the heating means 8 is 40 ° C. to 90 ° C. By the way, if the predetermined temperature α is lower than 40 ° C., fine powder of carbon black adheres and a bridging trouble occurs. If the temperature is higher than 90 ° C., carbon black may be denatured, which is not suitable.

In addition, since the occurrence of bridging troubles can be reliably prevented and the denaturation of carbon black can also be surely prevented, the heating temperature β in the heating room 9 is maintained at 45 ° C. to 55 ° C. In addition, it is preferable to maintain the heating temperature γ of the local heaters 10, 10 at 65 ° C to 75 ° C.

There are various types (brands) of carbon black on the market.
Is compatible with all brands of carbon black.

FIG. 2 shows another embodiment of the powder weighing apparatus according to the present invention. This apparatus 1 is for continuously weighing powdered zinc white. Powder supply path 3
The zinc white supplied from the zinc white silo 15 communicatively connected to the upstream side is supplied to the powder meter 2 by the screw feeder 11 provided in the powder supply path 3, A predetermined weight of zinc white weighed by the weighing device 2 passes through the powder conveying path 4 and is put into a bag 16 made of polyethylene or the like.

Further, as shown by a two-dot chain line, the heat insulation chamber 9 is provided in the powder meter 2, the powder supply path 3, the lower end of the silo 15, and the powder conveyance path 4 in an encircling manner. That is, the heating and warming chamber 9 includes the powder meter 2, the powder supply path 3, and the powder transport path 4.
Are provided in a substantially encircling shape. This heating insulation room 9
Is a copper tube (not shown) through which a mixed fluid of steam and water flows,
Temperature control means for adjusting the temperature or flow rate of the fluid flowing through the copper tube to maintain the room temperature within a predetermined temperature range.

Further, a local heater 10 is provided in the powder supply path 3. The local heater 10 includes an electric heater H wound around the powder supply path 3 and a heating temperature γ of the electric heater H which is electrically connected to the electric heater H.
Temperature control means 17 for maintaining the temperature in a predetermined temperature range
And 18 is a power supply.

Thus, the heating and keeping temperature β of the heating and keeping room 9
Is maintained at 45 ° C. to 55 ° C., and the heating temperature γ of the local heater 10 is maintained at 65 ° C. to 75 ° C. That is, the powder meter 2, the powder supply path 3, and the powder transport path 4 are substantially entirely at 45 ° C.
It has a double heating structure in which the powder supply path 3 is maintained at 55 ° C and the powder supply path 3 is maintained at 65 ° C to 75 ° C.

As a result, the zinc white powder is transferred to the contact inner wall portions 2 a, 3 a, 3 d of the powder meter 2, the powder supply path 3, and the powder transport path 4.
4a can be prevented from adhering. And zinc flower is silo
15 can be prevented from adhering to the inner surface. In particular, since the powder supply path 3 where the adhesion of zinc white easily occurs is maintained at a higher temperature than other parts by the local heater 10, the adhesion of zinc white can be surely prevented. Therefore, it is possible to prevent the occurrence of bridging troubles such as poor flow of zinc white, stoppage of the flow and deterioration of the measurement accuracy.

In addition, the heating and keeping temperature β of the heating and keeping room 9 is:
Since the heating temperature γ of the local heater 10 is maintained at a temperature lower than the temperature at which dissolution, ignition, softening, and collapse of granulation occur in zinc white, denaturation of zinc white can be prevented. Further, the portion where the bridging trouble is relatively unlikely to occur is heated in the heating and keeping room 9, and the portion where the bridging trouble is likely to occur (the powder supply path 3) is lower than the heating and keeping temperature β of the heating and keeping room 9. Since it is locally heated at a high temperature, energy is not wasted and it is reasonable.

It should be noted that the heating and keeping temperature β of the heating and keeping room 9 is
The heating temperature γ of the local heater 10 is 40
The temperature can be changed as appropriate within the range of ° C to 80 ° C. That is, the predetermined temperature α of the heating means 8 is set to 40 ° C. to 80 ° C. By the way,
When the predetermined temperature α is lower than 40 ° C., adhesion of zinc white occurs and a bridging trouble occurs. On the other hand, if the temperature is higher than 80 ° C, zinc white may be denatured, which is not appropriate.

In addition, it is possible to reliably prevent the occurrence of bridging trouble and also to surely prevent denaturation of zinc white.
Maintained at 55 ° C, and set the heating temperature γ of the local heater 10 to 65 ° C.
Preferably, it is maintained at ~ 75 ° C.

Although various types of zinc white are available on the market, this powder weighing apparatus is particularly effective for zinc white of Nos. 1 to 3. In some cases, other types of zinc white can be handled.

The powder weighing range of the powder weighing device shown in FIGS. 1 and 2 is 0.05 kg to 100.00 kg, and
The minimum scale is set to 10 g, but the powder measurable range and the minimum scale are not limited to these numerical values. Further, the local heaters 10 and 10 of the measuring device 1 shown in FIG. 1 are replaced with electric heaters H such as the local heaters 10 of the measuring device 1 shown in FIG.
And temperature control means 17 may be provided. Further, the local heater 10 of the weighing device 1 shown in FIG.
May be provided with a pipe 14 such as the local heaters 10 and 10 of the metering device 1 in FIG. 1 through which a mixed fluid of steam and water flows, and a temperature control means.

The powder supply path 3 of the weighing device 1 shown in FIG.
A local heater 10 provided with a pipe 14 through which a mixed fluid of steam and water flows, and a temperature control means, or a local heater provided with an electric heater H and a temperature control means 17
10 is optional. Also, the weighing device 1 of FIG.
Through which a mixed fluid of steam and water flows through the powder conveying path 4
14 and a local heater 1 with temperature control means
Alternatively, the local heater 10 provided with the electric heater H and the temperature control means 17 may be freely provided.

[0036]

Since the present invention is configured as described above, the following significant effects can be obtained.

According to the powder weighing device of the first aspect , the occurrence of a bridge trouble can be prevented without inducing the failure, breakage, and deterioration of the weighing accuracy of the weighing device. further,
Due to the double heating structure, wasteful energy is not used, and the cost for using the weighing device can be reduced.

According to the powder measuring device of the second aspect , the bridging trouble of the carbon black can be more reliably prevented, and the dissolution, ignition, softening, and granulation of the carbon black can be prevented. . Especially,
Bridging troubles in the measuring damper section 12 and the wind pressure damper section 13 where carbon black easily adheres can be reliably prevented.

According to the powder measuring device of the third aspect , the bridging problem of zinc white can be more reliably prevented, and the dissolution, ignition, softening, and crushing of the zinc white can be prevented. . In particular, it is possible to reliably prevent a bridging trouble in the powder supply path 3 in which the adhesion of zinc white easily occurs.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram showing one embodiment of the present invention.

FIG. 2 is a simplified configuration diagram showing another embodiment.

[Explanation of symbols]

 Reference Signs List 2 powder meter 2a contact inner wall 3 powder supply path 3a contact inner wall 4 powder transfer path 4a contact inner wall 8 heating means 9 heating and warming room 10 local heater 12 measuring damper section 13 wind pressure damper section

Claims (3)

(57) [Claims] A powder measuring device and a powder measuring device.
Powder supply path 3 for feeding
Powder measuring device having a powder conveying path 4 for discharging to the outside
In the heating and heating chamber 9 maintained at a predetermined heating and heating temperature
And the above-mentioned powder weighing device is provided in the heating and warming chamber 9.
2 and substantially the entire powder supply path 3 and the powder transport path 4
And further, inside the above-mentioned heat insulation room 9,
Of the above-mentioned powder meter 2, powder supply path 3, and powder transport path 4,
In one or more predetermined locations,
A local heater 10 for maintaining a high predetermined heating temperature,
In addition, it is composed of the above-mentioned heat insulation room 9 and a local heater 10
A powder measuring device having a double heating structure . 2. The method according to claim 1, wherein the powder is carbon black, and the temperature of the heating chamber 9 is maintained at 45 ° C. to 55 ° C.
And the heating temperature of the local heater 10 is 65 ° C to 75 ° C.
° C, and the local heater 10 is
The powder weighing device according to claim 1, wherein the powder weighing device is attached to the weighing damper unit 12 and the wind pressure damper unit 13 provided in the fourth unit 4 . 3. The powder is zinc white and heat-insulated.
When the heating temperature of the chamber 9 is maintained at 45 ° C to 55 ° C,
In addition, the heating temperature of the local heater 10 is maintained at 65 ° C to 75 ° C.
The powder measuring device according to claim 1 , wherein the local heater (10) is provided in the powder supply path (3 ).