JPH0464017A - Detecting apparatus for continuous flow rate of powder and grain - Google Patents

Abstract

PURPOSE:To achieve continuous feed and continuous discharge by providing a load cell which measures the weight of receiving powder and grain and the weight corresponding to a rotary drum, a constant speed motor for rotating a rotary shaft, and a variable speed motor. CONSTITUTION:Powder and grain continuously fed from an inlet 3 of a flow cell 1 are put into a division (d) on a rotary drum 1 by a controller 6 through a switch gate 9. The drum 1 is rotated at a constant speed by a variable speed motor 7. The rotary speed of the motor 7 is changed by the controller 6 by dividing the storing weight of the drum 1 received by a load cell 5 into several stages. The measured weight by the cell 5 which measures the weight of the powder and grain including the packing of the drum 1 and the actually measured value of the rotating speed of a device which measures the changed rotating speed of the motor 7 are both input to the controller 6. These values are output from the controller 6 to 10 as detecting data of the continuous flow rate of the powder and grain.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a powder processing apparatus for producing appropriate amounts of various types of powder or granules or supplying appropriate amounts of various types of powder or granules. The present invention relates to a powder continuous flow rate detection device that continuously detects flow rate.

2. Description of the Related Art A conventional continuous flow rate detection device for powder and granular materials is such that an inclined plate is placed inside a flow path housing having one port and an outlet, and the inclined plate receives the powder and granular material falling from the inlet and absorbs the dynamic pressure. There are things that are measured using load cells. Although this device allows continuous loading and unloading of powder and granules, it is necessary to correct the measured values due to changes in physical properties such as changes in the particle size and wetness of the powder or the powder itself.

Also, the weighing hopper receives powder and granules for a certain period of time.

There is a powder flow rate detection device that measures the weight using a load cell. Since this device is not affected by the changes in physical properties described above, it is possible to detect the flow rate of powder and granular materials over a wide range with stable accuracy. However, since the capacity of the weighing hopper is limited, continuous feeding is not possible and it is necessary to interrupt the measurement, albeit for a short time. In order to avoid this interruption, it is also possible to provide a pair of weighing hoppers and use a single weighing hopper by switching between them, but this has the disadvantage that the equipment becomes larger, more complicated, and more expensive.

Problems to be Solved by the Invention The problems to be solved by the present invention are to use a 3-measurement bar for continuous feeding while retaining the advantage of maintaining stable accuracy without being affected by changes in physical properties.

The purpose is to improve the weighing hopper so as to enable continuous discharge.

SUMMARY OF THE INVENTION In the present invention, the problem is solved by replacing the metering hopper with a number of compartments on a rotating drum of a rotating drum in a channel housing with an inlet and an outlet.

Operation In the present invention, when a large number of compartments on a rotating drum that is rotating once receives powder and granular material continuously from the inlet of the channel housing,
All of the powder and granules are received and stored in several compartments, while the powder and granules are continuously discharged to the outlet of the channel housing. The state in which the rotary drum receives and stores the powder and granules through this compartment is similar to the state in which the weighing hopper receives and stores the powder and granules. However, since the rotating drum is rotating, it is necessary to consider its rotational speed.

By using a rotating drum, continuous loading and unloading is possible while retaining the advantages of a metering hopper.

Example The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of a first embodiment of the present invention.

A rotary drum 1 is rotatable by a rotary shaft 2 and is connected to a flow path casing 1.
It is located within 1. Flow path housing 11 is flowing! It has an inlet 3 into which the granular material to be detected is continuously input, and an outlet 4 through which the granular material for the detection method is continuously discharged.

Powder and granular material introduced from the inlet 3 and falling is received by the rotating drum 1 via the switching gate 9. The rotation axis 2 of the rotary drum 1 is in a direction perpendicular to the flow path of the granular material falling from the inlet 3, that is, in a horizontal direction. A rotating drum 1 exists in the flow path of the powder and granules falling from the inlet 3, and the rotating drum 1 is positioned so that it can receive all of the powder and granules falling from the inlet 3. 1 exists in the radial direction of the rotating shaft 2 and is orthogonal to the axis of the rotating shaft 2 and spaced apart from each other; and 1 exists in the radial direction of the rotating shaft 2 and is equiangularly spaced along the axis It has a large number of compartments d made up of a large number of partition walls C like the blades of an impeller.

The motor 7 that rotates the rotary drum 1 by the rotary shaft 2 is a constant speed motor or a variable speed motor that can select several levels of rotational speed or rotational speed. Hereinafter, it will be simply referred to as the variable speed motor 7.

The rotating drum 1 and the variable speed motor 7 are supported together with the rotating shaft 2 by a flow path housing 11 via a load cell 5. In this way, initially, the tare weight of the rotary drum 1 including the variable speed motor 7 in which no powder or granules is present in the load cell 5, that is, the weight corresponding only to the rotary drum 1 is measured. The controller 6 uses the measured value as the zero point of the tare weight of the rotating drum 1.
to be memorized.

Powder and granular material to be detected that is continuously injected from the inlet 3 of the channel housing 11 and falls is transferred to the rotating drum via the switching gate 9, which is instructed by the controller 6 to set the switching gate 9 to the inlet side (solid line position). 1 is received by compartment d above. The rotary drum 1 is rotated at a constant speed by a variable speed motor 7, and when the powder and granules received by the rotation of the rotary drum 1 are continuously discharged from the rotary drum 1 to the outlet 4, they become normal powder and granules. The state is a continuous flow rate detection state, that is, a state in which the stored weight of the powder and granular material received by the rotating drum 1 is actually measured by the load cell 5, but from the viewpoint of measurement accuracy of the load cell 5, the stored weight received by the load cell 5 is approximately within a constant range. This is desirable.

To do this, a variable speed motor (or a constant speed motor may be used) is required so that the weight received by the load cell 5 is within a certain range.
It is preferable to change the rotation speed of the motor in stages. Furthermore, since the detected flow rate of the powder and granular material depends on the weight of the received powder and granular material received by the load cell 5 and the rotational speed of the rotating drum 1, that is, the rotational speed of the variable speed motor 7, it is necessary to know the actual measured values of both at each time. is desirable.

The rotational speed of the variable speed motor 7 is changed by controlling the stored weight of the rotating drum received by the load cell 5 in several stages and instructing the controller 6 to change the rotational speed of the rotating drum 1 each time.
The weight measurement value of the load cell 5 that actually measures the weight of the received powder and granular material including the tare weight of These values are input from the controller 6 as continuous flow rate detection data of the powder and granular material as a controller output 10. Note that a device for actually measuring the rotational speed of the variable speed motor 7 is not shown in FIG. 1, but is explained in the embodiments shown in FIGS. 2 to 6.

Further, the controller 6 instructs the switching gate 9 to temporarily switch to the bypass side (-dotted chain line position) at regular time intervals. The instruction causes the air cylinder 8 to be operated.

When the switching gate 9 is on the bypass side, the load cell 5 will arbitrarily measure the tare weight of the rotating drum 1.
If powder or granules adhere to the rotating drum 1 and cannot be removed, the zero point of the tare weight will be displaced, causing a measurement error, so it is desirable to correct the zero point. Therefore, the correction is made at the time of the switching instruction of the switching gate 9,
Thereafter, the state is returned to the normal continuous flow rate detection state of powder or granular material using the corrected zero point as a reference.

In the first embodiment shown in FIG. 1, the rotary drum 1 as well as the load cell 5 and the variable speed motor 7 are located within the flow path surface 11, but this may result in failure of the variable speed motor 7 or the load cell 5 due to contamination from powder or granules. There is a possibility that it may cause The second embodiment shown in FIGS. 2 to 6 is an improvement on this point. Among the reference numerals in the second embodiment, the same reference numerals are given to those in the first embodiment that do not require special explanation.

A flow path housing 11 having an inlet 3 and an outlet 4 has a rotating drum 1 mounted on a horizontal rotating shaft 2 below an inlet 3° switching gate 9′.
It is arranged so that it can be rotated.

An instrument casing 12 is provided adjacent to the flow path casing 11, and the instrument casing 1
2 has a protrusion 14 that protrudes into the instrument casing 12 on a side wall in contact with the channel casing 11, and a sealing diaphragm 15 provided at the end thereof.

The rotating shaft 2 of the rotating drum 1 has a bearing 16 of a shaft support cylinder 13,
The shaft supporting cylinder 13 is attached to the sealing diaphragm 15 by passing through the position of the sealing diaphragm 15, and has one end on the flow path housing 11 side and the other end on the instrument housing 12 side. , a mechanical seal 18 is provided at one end of the 11 example flow path housings. The rotating shaft 2 passes through a shaft support cylinder 13 and is connected to a variable speed motor (a constant speed motor may also be used) 7 located inside the meter t12.

Two horizontal beam arms 19 along the horizontal plane of the horizontal rotating shaft 2 passing through the shaft support tube 13 are integrally attached to the side wall of the shaft support tube 13 of the instrument housing 12. The two beam arms 19 are located within the instrument surface 12 and extend in the direction toward the channel housing 11 to a portion overlapping with the protrusion 14 of the instrument surface 12. Namely.

The bearing cylinder I3 not only penetrates the sealing diaphragm 15 and has one end inside the flow path housing 11.

It also exists within the instrument surface 12 via both ends of the two beam arms 19, and extends to a place close to the flow path housing 11. Therefore, when these two beam arms 19 are used, it is possible to support both ends of the bearing sleeve 13 within the instrument surface 12.

Along a parallel line that is in a vertical plane perpendicular to the horizontal plane of the rotating ring 2 of the rotating drum 1 and parallel to the axis of the rotating shaft 2, in other words, along the axis of the rotating shaft 2, corresponding to both ends of the bearing sleeve 13. A first load cell 51 and a second load cell 5□ are arranged at intervals within the instrument surface 12, and each of the load cells 51, 5□ is attached to a support frame arm 25 fixed to the instrument surface I2. First load cell5. There is a bifurcated arm 20 for the first load cell.
are attached, each end of which is connected to said two beam arms 19
is rotatably fixed to each end by a port 22 and a nut 23. A bifurcated arm 21 for the second load cell is attached to the second load cell 5 □, and each end thereof is located on the horizontal plane of the rotating shaft 2 and is rotated by two support bins 24 that are fixed opposite to the bearing sleeve 13. Fixed as possible. In this way, the rotating drum 1.
The bearing sleeve 13 and the variable speed motor 7 are connected to the first load cell 5I.
and the second load cell 5□ together with the rotating shaft 2, and if the center of gravity 0 of these is placed between the first load cell 5 and the second load cell 5□, the zero point of the tare weight of the rotating drum 1 will be stabilized. Determined by state. Depending on the weight of the powder and granular material received, the weight received by the second load cell 5□ may be reduced, but taking this into consideration, both load cells 5. ．． 5. As a result, the weight of the received powder or granular material can be measured within the instrument surface 12 in the same manner as the load cell 5 in FIG. A sealing diaphragm 15 is interposed between the rotary drum 1 in the flow path casing 11 and both load cells 55, 5□ in the instrument surface 12, so that the instrument surface 1 is separated even when measuring two weights.
The inside of 2 is isolated from the inside of the flow path housing 11, and the variable speed motor 7 is also isolated like both load cells 51, 5□. never be done.

The actual measurement of the rotational speed of the variable speed motor 7 is carried out using the Komei rotary table 26 fixed to the rotating shaft 2 and the Komei rotary table 2.
The photoelectric device 27 is connected to the support frame arm 2 via a support plate 28.
It is attached to 5.

Further, switching of the first switching gate 9 is performed by swinging the switching gate 9 around the swing shaft 29, but this operation may be performed automatically using the air cylinder 8 or manually using the handle 30.

Effects of the Invention The present invention uses a rotary drum 1 having a large number of compartments d in place of a weighing hopper, so continuous input and discharge can be carried out while maintaining stable accuracy without being affected by changes in the physical properties of powder or granules. It is possible to detect the continuous flow rate of powder and granular materials, and by changing the rotation speed, it is possible to measure within the accurate range of the load cell, and by switching the switching gate 9, it is possible to measure the weight corresponding to only the rotating drum. By interposing the sealing diaphragm 15 between the rotary drum 1 and both load cells 5I52, it is possible to prevent instruments from being contaminated with powder and granules, and a single controller can be used. 6 gives an instruction to change the rotational speed of the variable speed motor 7 and a switching instruction to the switching gate 9, and the load cell 5;
A device 26 for actually measuring the weight measurement value and rotational speed of items 1 and 52.
The continuous flow rate of the powder and granular material can be detected using the rotational speed measurement value of 27, and the entire measurement can be controlled by a program.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a schematic diagram showing a first embodiment of a continuous flow rate device for powder and granular material according to the present invention, and Fig. 2 is a partially cutaway front view showing a second embodiment of the present invention. Fig. 3 is a sectional view taken along line 8-^ in Fig. 2, and Figs. 4 to 6 are sectional views taken along B-B and C-C in Fig. 2, respectively.
It is a DC sectional view. 1031 rotating drum 2051 rotating shaft 310. Entrance 402. Exit 5, 51, 5211. ,
Load cell 600. Controller 718. Constant speed motor or variable speed motor 936. Switching gate 10, Controller output 11, Flow path housing a, b, End plate d960 Compartment chamber 12, Instrument housing C61, Partition plate

Claims (1)

[Claims] 1) A flow path housing (11) having an inlet (3) and an outlet (4) and allowing the powder or granular material whose flow rate is to be detected to fall from the inlet (3) to the outlet (4); It is rotated by a rotating shaft (2) located inside the road casing (11) and located in a direction transverse to the powder and granular material falling from the inlet (3). ) is partitioned by two end plates (a, b) that exist in the radial direction and are orthogonal to the axis, and a partition plate (c) that connects these end plates and is located along the axis at equal angular intervals. A rotating drum (1) having a large number of compartments (d), load cells (5; 5_1, 5_2) for measuring the weight of the rotating drum (1) together with the received powder and granules, and the rotating shaft (2).
) A constant speed motor or variable speed motor (7) for rotating a powder or granular material continuous flow rate detection device. 2) So that the measured values of the load cells (5; 5_1, 5_2) that measure the weight corresponding to the rotating drum (1) together with the received powder and granular material remain almost constant regardless of changes in the flow rate of the powder and granular material to be detected. 2. The continuous flow rate detection device for granular material according to claim 1, further comprising a controller (6) for changing the rotational speed of the variable speed motor (7), and devices (26, 27) for actually measuring the changed rotational speed. 3) Inlet (3) of channel housing (11)
A switching gate (
9) so that the weight corresponding to only the rotating drum (1) can optionally be measured with a load cell (5; 5_1, 5_2). 4) A flow path casing (11) and an instrument casing (12) partitioned from the flow path casing (11) by a sealing diaphragm (15).
The first and second load cells (5_1, 5_2) are arranged at intervals along the axis of the rotating shaft (2) in the instrument housing (12), and the Rotating drum (1
) and both load cells (5_1, 5_2) are separated by a sealing diaphragm (15). 5) Instructions to change the rotation speed of the variable motor (7);
A device (26, 27) that instructs the switching gate (9) to switch and also measures the weight measurement value of the load cell (5; 5_1, 5_2) each time and the rotational speed of the changed variable speed motor (7). 4. The continuous flow rate detection device for powder and granular material according to claim 3, further comprising a controller (6) that continuously detects the flow rate of the powder and granular material based on the rotational speed measurement value of the controller and outputs the controller output (10). .