JP2001113522A - Measuring hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring hopper enabling pneumatic transport of a measured powder material by a simple constitution without equipment with a discharge gate and a service hopper. SOLUTION: A load cell 17 is provided on the outer wall surface of the bottom wall 25 of a hopper main body 16, while the end part 31 of a suction nozzle 18 for sending a granule to a suction transport pipe 19 sucked from a suction type blower 22 is made to front on the inner wall surface of the bottom wall inside the hopper main body 16. According to this constitution, the granule received by the hopper main body 16 is pneumatically transported from the suction nozzle 18 to the suction transport pipe 19 after it is measured by the load cell 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weighing hopper, and more particularly to a weighing hopper for weighing particles such as resin pellets.

[0002]

2. Description of the Related Art Conventionally, in molding a resin pellet or the like, a weighing hopper for measuring a predetermined amount of the resin pellet has been widely used.

Such a weighing hopper is usually provided with a weighing hopper 1 and a service for pneumatically transporting the resin pellets weighed by the weighing hopper 1 as shown in FIG. The hopper 2 is used in combination. In the weighing hopper 1,
A load cell 3 for detecting the weight of the weighing hopper 1 and a discharge gate 4 for discharging the weighed resin pellets to the service hopper 2 are provided. For example, the resin pellets cut out by the screw feeder 7 are provided. Then, the resin pellets are weighed by a predetermined amount by the load cell 3 and then discharged to the service hopper 2 by the opening operation of the discharge gate 4. A transport pipe 5 for pneumatic transport is connected to the service hopper 2, and the resin pellets received in the service hopper 2 are transferred via the transport pipe 5 by the operation of a suction blower (not shown). It is configured to transport energy. In addition, in order to prevent the transportation pipe 5 from being closed by resin pellets, the transportation pipe 5 is provided with an end on the connection side end thereof with the service hopper 2.
An air intake 6 for taking in the next air is provided.

[0004]

However, in such a weighing hopper 1, if the transport pipe 5 is connected directly from the discharge gate 4 to perform pneumatic transport, the structure becomes complicated. It is necessary to put the resin pellets into the service hopper 2 once. for that reason,
Space for installing the service hopper 2 is required,
The apparatus cannot be reduced in size, and the weighing hopper 1 must be arranged at a higher position, which is inconvenient for maintenance and the like, and the cost for equipping the service hopper 2 increases. Cause a problem that

The opening and closing operation of the discharge gate 4 requires power such as electricity or compressor air.
For example, there is a possibility that the resin gate may be caught or the discharge gate 4 itself may be broken. In addition, since the cost for equipping the discharge gate 4 is also generated, there is a problem that the cost of the weighing hopper 1 increases. Further, the discharge gate 4 is connected to the weighing hopper 1
, The weight of the weighing hopper 1 increases accordingly, so that the load cell 3 needs to select a large capacity because of the increase in the weight, the signal output per unit weight decreases, and the weighing accuracy increases. It is necessary to use an expensive load cell 3 which has a large signal output per unit weight, and furthermore, there is a problem that a measure against disturbance such as vibration is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to pneumatically transport a weighed powder or granule by a simple configuration without a discharge gate or a service hopper. And a weighing hopper.

[0007]

Means for Solving the Problems In order to achieve the above object, the present invention according to claim 1 provides a hopper body having a closed bottom and detecting the weight of the hopper body so that the inside of the hopper body is detected. Weight detecting means for weighing the granular material received in the hopper, and a suction nozzle for sending the granular material to a suction transport pipe which faces the bottom inside the hopper body and is sucked from a pneumatic source. It is characterized by.

According to such a configuration, the granular material received by the hopper body is measured by a predetermined amount by the weight detecting means and then sent from the suction nozzle to the suction transport pipe.
As a result, the weighed powder or granular material can be transported by a simple configuration without using a discharge gate or a service hopper.

The invention described in claim 2 is the first invention.
Wherein the downstream end of the suction nozzle in the transport direction is disposed so as to face the upstream end of the suction transport tube in the transport direction with a predetermined gap therebetween. .

According to such a configuration, the suction nozzle,
Since there is no contact with the suction transport pipe, there is no weighing error caused by the weight of the suction transport pipe during weighing, and also, at the time of pneumatic transport, the downstream end of the suction nozzle in the transport direction and the suction transport pipe. Since the secondary air is taken in from the gap between the end portion and the upstream side in the transport direction, the granular material is pneumatically transported without clogging.

[0011] The invention according to claim 3 is based on claim 1.
In the invention described in (2), the suction nozzle is detachably provided on the hopper body.

According to such a configuration, in the maintenance of the hopper main body, the suction nozzle can be removed from the hopper main body for cleaning, so that maintenance work such as cleaning work can be performed simply and smoothly.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the upstream end of the suction nozzle in the transport direction is substantially equal to the center of the bottom of the hopper body. Is characterized in that it is arranged so as to oppose.

According to such a configuration, the powder and granules received in the hopper main body are sucked by the suction nozzle substantially opposed to the center of the bottom of the hopper main body without remaining in the hopper main body, and the suction transport pipe is provided. Sent to

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the upstream end of the suction nozzle in the transport direction is defined with respect to the opening cross-sectional area of the upstream end of the suction nozzle in the transport direction. It is characterized in that the area of the bottom of the hopper body is substantially within 3.2 times.

According to such a configuration, the granular material received in the hopper main body can be sent to the suction transport pipe all over without leaving it in the hopper main body.

The invention described in claim 6 is the first invention.
The invention according to any one of the first to fifth aspects, wherein the weight detecting means is provided at a bottom of the hopper body.

According to such a configuration, since the weight detecting means is provided at the bottom of the hopper main body, the weight of the hopper main body is applied substantially evenly to the weight detecting means, so that the weighing accuracy is improved. be able to.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall configuration diagram showing an embodiment of a granular material processing system provided with a weighing hopper of the present invention.

In FIG. 1, the processing system includes, for example, a feeder hopper 11, a weighing hopper 12, a processing device (eg, a molding machine, a dryer, a mixer, etc.) 13 and a pneumatic transport device 14.

The feeder hopper 11 is provided with a screw feeder 15, and the powdery material received in the feeder hopper 11
, And supplied into a weighing hopper 12 disposed below the hopper.

The weighing hopper 12 includes a hopper body 16, a load cell 17, and a suction nozzle 18, as will be described in detail later. The powder and granules supplied to the hopper body 16 are weighed by the load cell 17 in a predetermined amount. After that, the air is transported from the suction nozzle 18 to the processing apparatus 13 by the air transport apparatus 14 described below.

The pneumatic transport device 14 is provided with a suction transport pipe 19, a loader hopper 20, a filter 21, and a suction blower 22 as a pneumatic power source in that order, and the suction blow pipe 22 is operated by the operation of the suction blower 22. The hopper body 1 of the weighing hopper 12 through the suction nozzle 18
6 is sucked, and the sucked powder and granules are transferred from the suction nozzle 18 through the suction transport pipe 19 to the loader hopper 2.
After being pneumatically transported to zero and separated from air in the loader hopper 20, it is supplied to the processing device 13. In addition,
The air separated from the granular material in the loader hopper 20 is exhausted from the suction blower 22 after the dust is removed in the filter 21.

The weighing hopper 12 used in such a processing system is configured as follows.
FIG. 2 is a side sectional view showing one embodiment of the weighing hopper of the present invention, and FIG. 3 is a top view of the weighing hopper in FIG. 2 and 3, the weighing hopper 1
2 will be described in detail.

2 and 3, the weighing hopper 12 includes the hopper body 16, the load cell 17 as the weight detecting means, and the suction nozzle 18, as described above.

The upper portion of the hopper body 16 is open, the upper cylindrical portion 23 is formed in a cylindrical shape, and is continuously formed downward from the lower end of the upper cylindrical portion 23, and is narrowed downward. A lower funnel part 24 formed in a funnel shape as described above, and a disc-shaped bottom wall 25 provided continuously from the lower end edge of the lower funnel part 24 and closing the bottom of the hopper body 16 are provided. ing. In addition, a locking groove 30 for locking a locking shaft 28 of the suction nozzle 18 described later is formed at two places on the upper end edge of the upper cylindrical portion 23.

The load cell 17 is disposed below the bottom wall 25 of the hopper body 16, and is provided at a substantially central portion of the outer wall surface of the bottom wall 25 so that the sensor section 26 is in contact therewith.

The suction nozzle 18 has a nozzle body 27, a locking shaft 28 and a positioning shaft 29. When the nozzle body 27 is mounted on the hopper body 16,
An inclined tube 33 extending linearly obliquely downward from the upper end edge of the upper cylindrical portion 23 to the axis of the lower funnel portion 24, and a bent tube 33 extending from the inclined funnel 33 extending to the axis of the lower funnel portion 24 to form a lower funnel. A vertical tube 34 extending linearly downward along the axial direction of the portion 24 is formed as a substantially rectangular shape.

The locking shaft 28 is substantially perpendicular to the inclined pipe 33 from both sides of the inclined pipe 33 at a position where the inclined pipe 33 of the nozzle body 27 faces the upper end edge of the upper cylindrical portion 23. , And both ends 35 of the upper cylindrical portion 2 extend in the horizontal direction.
3 are configured so as to be hooked on the two locking grooves 30 respectively.

The positioning shaft 29 extends from the lower side of the inclined tube 33 toward the inner wall surface of the lower funnel portion 24 so as to overlap the inclined tube 33 in the up-down direction, and the end portion 36 thereof extends downward. It is provided so that it may contact the inner wall surface of the side funnel part 24.

The suction nozzle 18 is connected to the locking shaft 2
When the positioning shaft 29 is in contact with the inner wall surface of the lower funnel portion 24 while the positioning member 8 is hung in the locking groove 30 of the upper cylindrical portion 23 and the positioning shaft 29 is in contact with the inner wall surface of the nozzle body 27, the upstream of the nozzle body 27 in the pneumatic transport direction Side end 31 (ie, vertical tube 34)
(A free end of the hopper body 16) faces a substantially central portion of the bottom wall 25 of the hopper body 16 at a predetermined interval (that is, an opening of the upstream end portion 31 faces the bottom wall 25).
Are located. The area of the bottom wall 25 is substantially less than 3.2 times (for example, 2.2 times) the opening cross-sectional area of the upstream end portion 31. More specifically, the area of the bottom wall 25 includes, for example, the angle of repose of the granular material, the weight of the granular material, the cross-sectional area of the opening of the upstream end portion 31, the space between the upstream end portion 32, It is appropriately determined according to factors such as the transport air volume and the wind speed.

In this state, the nozzle body 27
The downstream end 32 (that is, the free end of the inclined pipe 33) of the powdery material in the pneumatic transport direction faces the upstream end 37 of the suction transport pipe 19 in the pneumatic transport direction with a predetermined gap therebetween. Are arranged as follows. More specifically, a portion of the suction transport pipe 19 near the nozzle body 27 is disposed so as to extend obliquely upward along the axial direction of the nozzle body 27, and the upstream end 37 of the suction transport pipe 19 is provided. The downstream end 32 of the nozzle body 27 is formed in a shape that is cut in the vertical direction (a shape that is cut obliquely with respect to the respective axis directions). And the upstream end 3 of such a suction transport pipe 19
The opening 7 and the opening at the downstream end 32 of the nozzle body 27 face each other with a predetermined space therebetween in a state where they face each other.

When the powdery material is weighed in the weighing hopper 12, first, the load cell 17 is weighed.
In the above, the weight (tare weight) of the hopper body 16 is canceled, and then, the granular material is cut out by the screw feeder 15, the cut-out amount of the granular material is measured by the load cell 17, and Then, the cutting out of the screw feeder 15 may be stopped.

When a predetermined amount of the granular material is pneumatically transported, the suction type blower 22 is operated to suck the granular material in the hopper body 16 through the suction nozzle 18 as described above. Then, pneumatic transportation may be performed through the suction nozzle 18.

That is, in the weighing hopper 12 configured as described above, it is possible to pneumatically transport the weighed granules with a simple configuration without providing a discharge gate, a service hopper, and the like. Therefore, a space for providing a service hopper is not required, the apparatus can be reduced in size, and the weighing hopper 12 can be arranged at a low position, which is convenient for maintenance. The cost for mounting is not required, and the cost of the entire apparatus can be reduced. In addition, power for driving the discharge gate is not required, and running costs can be reduced. Further, there is no failure due to driving of the discharge gate, so that the running cost and the failure rate of the entire apparatus can be reduced. Can be planned. In addition, since the cost for installing the discharge gate is not required, the cost of the entire apparatus can be reduced, and the weight of the weighing hopper 12 can be reduced because the discharge gate is not provided. In addition, accurate measurement can be performed even with an inexpensive load cell 17 having a small output signal.

In the measuring hopper 12, the downstream end 32 of the nozzle body 27 is disposed so as to face the upstream end 37 of the suction transport pipe 19 with a predetermined gap. Since the nozzle body 27 and the suction transport pipe 19 do not come into contact with each other and the pneumatic transport device 14 and the weighing hopper 12 are separated from each other, only the hopper body 16 and the suction nozzle 18 The weight is detected as the tare weight, and for example, unlike the case where the nozzle body 27 is connected to the suction transport pipe 19, there is no weighing error caused by the weight of the suction transport pipe 19, and the granular material is accurately weighed. can do. Also, during pneumatic transportation, the downstream end 32
And the gap between the upstream end 37 of the suction transport pipe 19 and
Since the secondary air is taken in, the secondary air can be taken in without forming an air intake for taking in the secondary air, and thereby the pneumatic material can be satisfactorily transported without being blocked. be able to.

The gap between the downstream end 32 of the nozzle body 27 and the upstream end 37 of the suction / transport pipe 19 is appropriately adjusted according to the capacity of the pneumatic transport device 14 and the transport distance. do it.

Further, the suction nozzle 18 has its locking shaft 28
Can be attached to and detached from the hopper main body 16 by a simple operation of locking the locking groove 30 of the hopper main body 16 or pulling it upward. For example, in maintenance of the hopper main body 16,
The suction nozzle 18 can be easily removed from the hopper body 16 for cleaning, and maintenance work can be performed extremely easily and smoothly. When attaching the suction nozzle 18, the locking shaft 28 is locked in the locking groove 30 of the hopper body 16 so that the end 36 of the positioning shaft 29 is attached to the inner wall surface of the lower funnel 24 of the hopper body 16. In contact therewith, the suction nozzle 18 is accurately and reliably positioned within the hopper body 16, so that it can be mounted accurately by a very simple operation.

Further, in a state where the suction nozzle 18 is positioned and attached in this manner, the upstream end 31 of the nozzle body 27 is connected to the bottom wall 2 of the hopper body 16.
5 is arranged so as to be substantially opposed to the central portion at a predetermined interval, and the area of the bottom wall 25 is substantially 3.2 to the cross-sectional area of the opening of the upstream end portion 31. When transporting with pneumatic power, the hopper body 16
The granular material received therein is sucked from the upstream end 31 of the nozzle body 27 without remaining in the hopper body 16 and sent to the suction transport pipe 19. Therefore, the granular material can be processed in an accurate amount every time the weighing hopper 12 performs the weighing operation.

The load cell 17 has a sensor 2
6 is provided so as to come into contact with a substantially central portion of the outer wall surface of the hopper main body 16, so that it does not receive an eccentric load from the hopper main body 16, so that the measurement accuracy can be improved, and more accurate and accurate measurement can be achieved. Reliable weighing can be achieved.

In the above description, the granular material is cut out by the screw feeder 15, but any supply means may be used to supply the granular material to the weighing hopper 12. The type of the granules is not particularly limited, such as resin pellets and ceramic particles. Further, the shapes of the upper cylindrical portion 23, the lower funnel portion 24, and the bottom wall 25 of the hopper body 16 are not particularly limited, and are not limited to a circular cross section, but may be a polygon or the like. Further, the lower side of the hopper main body 16 is not formed in a funnel shape, but is formed in the same cylindrical shape as the upper cylindrical portion 23, or formed so as not to be excessively throttled, and at the upstream side of the nozzle main body 27. The end 31 may be formed to have a wide mouth. Further, the upper side of the hopper body 16 does not need to be particularly open, and for example, the upper side is closed in a state where the supply pipe to which the granular material is supplied and the suction nozzle 16 are provided. It may be something.

In the present embodiment, the suction transport tube 1
9 and the downstream end 32 of the nozzle body 27.
Are formed in such a shape as to be cut in the vertical direction, and are arranged facing each other at a predetermined interval in a state facing each other, but are arranged facing each other at a predetermined interval. If it does, it does not need to be formed as a shape that is particularly cut in the vertical direction. However,
The upstream end 37 of the suction transport pipe 19 and the downstream end 32 of the nozzle body 27 are connected so that the secondary air can be taken in from the entire periphery of the upstream end 37 of the suction transport pipe 19. It is preferable that the gap is shaped so as to be parallel in the direction in which the gap is provided. Further, the upstream end 37 of the suction transport pipe 19 and the downstream end 32 of the nozzle body 27 may be connected depending on the purpose and use thereof, and are formed integrally without being distinguished. You may. When the amount of secondary air taken in from the gap between the upstream end 37 of the suction transport pipe 19 and the downstream end 32 of the nozzle body 27 is small, or when the length of the nozzle body 27 is long, Alternatively, the nozzle body 27 may be formed as a double tube or a ten-tube tube so that secondary air can be separately taken in. If the upstream end 31 faces the bottom wall 25 of the hopper body 16, the nozzle body 27 does not necessarily need to be inserted from the upper opening of the hopper body 16. It may be inserted from the side so as to penetrate the side funnel 24.

[0043]

As described above, according to the first aspect of the present invention, it is possible to pneumatically transport the measured powder and granules with a simple configuration without providing a discharge gate and a service hopper. . Therefore, no space is required for providing a service hopper, the size of the device can be reduced, and the weighing hopper can be located at a lower position, which is convenient for maintenance. The cost for performing the operation is not required, and the cost of the entire apparatus can be reduced. In addition, power for driving the discharge gate is not required, and running costs can be reduced. Further, there is no failure due to driving of the discharge gate, so that the running cost and the failure rate of the entire apparatus can be reduced. Can be planned. In addition, the cost for installing the discharge gate is not required, so that the cost of the entire apparatus can be reduced.Moreover, since the discharge gate is not provided, the weight of the weighing hopper can be reduced. The weight can be accurately measured even by an inexpensive weight detecting means having a small output signal.

According to the second aspect of the present invention, at the time of weighing, a weighing error due to the weight of the suction / transport tube does not occur, so that the granular material can be accurately weighed. Also,
At the time of pneumatic transportation, the downstream end of the suction nozzle in the transportation direction,
From the gap between the suction transport pipe and the upstream end in the transport direction, 2
Since the secondary air is taken in, the pneumatic transport can be favorably performed without blocking the powder.

According to the third aspect of the present invention, by removing the suction nozzle from the hopper body, maintenance work such as cleaning work can be performed easily and smoothly.

According to the fourth aspect of the present invention, the powdery and granular materials received in the hopper main body are sucked by the suction nozzle and transported pneumatically without remaining in the hopper main body. Each time, the granular material can be treated in the correct amount.

According to the fifth aspect of the present invention, the powders and granules received in the hopper main body can be transported by pneumatic force without leaving the powder and granules in the hopper main body. With each operation, the granular material can be processed in an even more accurate amount.

According to the sixth aspect of the present invention, the weight of the hopper main body is added to the weight detecting means almost without bias, so that the weighing accuracy can be improved. Therefore, more accurate and reliable weighing can be achieved.

[Brief description of the drawings]

FIG. 1 comprises a weighing hopper according to the invention;
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an overall configuration diagram illustrating an embodiment of a granular material processing system.

FIG. 2 is a side sectional view showing one embodiment of the measuring hopper of the present invention.

FIG. 3 is a top view of the weighing hopper in FIG. 2;

FIG. 4 is a schematic side view for explaining a conventional weighing hopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Weighing hopper 16 Hopper main body 17 Load cell 18 Suction nozzle 19 Suction transport pipe 22 Suction blower 25 Bottom wall 31 Upstream end of suction nozzle 32 Downstream end of suction nozzle 37 Upstream end of suction transport pipe

Claims (6)

[Claims] A hopper body having a closed bottom;
By detecting the weight of the hopper main body, a weight detecting means for weighing the granular material received in the hopper main body, and a suction transport pipe which faces the bottom of the hopper main body and is sucked from a pneumatic source. A weighing hopper, comprising: a suction nozzle for sending a granular material. 2. The method according to claim 1, wherein a downstream end of the suction nozzle in the transport direction is disposed so as to face an upstream end of the suction pipe in the transport direction with a predetermined gap. A weighing hopper according to claim 1. 3. The suction nozzle according to claim 1, wherein the suction nozzle is detachably provided on the hopper body.
Or the weighing hopper according to 2. 4. The apparatus according to claim 1, wherein an upstream end of the suction nozzle in the transport direction is disposed so as to substantially face a center of a bottom of the hopper body.
4. The weighing hopper according to any one of claims 3 to 3. 5. The method according to claim 4, wherein the area of the bottom of the hopper body is substantially within 3.2 times the cross-sectional area of the opening of the suction nozzle at the upstream end in the transport direction. The weighing hopper as described. 6. The weighing hopper according to claim 1, wherein the weight detecting means is provided at a bottom of the hopper main body.