JP2013185835A - Powder-particle body flow rate measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder-particle body flow rate measuring apparatus that can prevent powder bodies from accumulating and laminating when measuring the powder bodies and that can accurately measure a flow rate of the powder bodies.SOLUTION: A powder-particle body flow rate measuring apparatus includes: an injection pipe 8 connected to an upstream side pipe 2; an exhaust pipe 9 connected to a downstream side pipe 3; a detection pipe 4 which is provided in an inclined manner between the injection pipe 8 and the exhaust pipe 9 and forms a flow passage of powder-particle bodies with the upstream side pipe 2, the injection pipe 8, the exhaust pipe 9 and the downstream side pipe 3; a load detector 6 for detecting a load W applied to the detection pipe 4 by supporting the detection pipe 4 so as to keep a non-contact state of the detection pipe 4 with the injection pipe 8 and the exhaust pipe 9; and a fixing part 5 for fixing the load detector 6 in a predetermined position and also to the injection pipe 8 and/or exhaust pipe 9. The flow rate of the powder-particle bodies P is measured on the basis of a value detected by the load detector 6.

Description

  The present invention relates to a granular material flow rate measuring device, and more particularly, to a granular material flow rate measuring device capable of preventing powder from being deposited and stacked.

  2. Description of the Related Art Conventionally, there is a granular material flow rate measuring device that receives a granular material that is input from a hopper or the like and falls with a receiving plate or the like and measures the flow rate of the granular material (see, for example, Patent Document 1 FIG. 4).

Japanese Patent Laid-Open No. 8-14962

  When trying to measure a finer powder than a granule using a conventional granule flow rate measuring device, the powder accumulates and is laminated on the receiving plate depending on the type of the powder. There was a problem that it was impossible to measure the exact flow rate.

  In order to solve this problem, an attempt was made to coat the backing plate with a material such as polytetrafluoroethylene having a small friction coefficient. However, the powder was deposited and laminated on the backing plate, and the flow rate of the powder was reduced. It was not possible to measure accurately.

  Therefore, the present invention has an object to provide a granular material flow rate measuring device capable of preventing powder accumulation and stacking and measuring the flow rate accurately when measuring powder. And

  The present invention is provided with an input pipe connected to the upstream side pipe, a discharge pipe connected to the downstream side pipe, and an inclination between the input pipe and the discharge pipe, and the upstream side pipe, the input pipe A detection tube that forms a flow path of the granular material together with the tube, the discharge tube, and the downstream pipe; and the detection tube is supported so as to maintain a non-contact state between the detection tube, the input tube, and the discharge tube A load detector for detecting a load applied to the detection pipe, and a fixing portion for fixing the load detector at a predetermined position and fixing the load detector to the input pipe and / or the discharge pipe. The granular material flow rate measuring device is characterized in that the flow rate of the granular material is measured based on the detected value.

  In addition, the present invention is provided with an inclination between the upstream side pipe and the downstream side pipe, and a detection tube that forms a flow path of the granular material together with the upstream side piping and the downstream side piping, and the detection tube, A load detector that supports the detection pipe so as to maintain a non-contact state between the upstream pipe and the downstream pipe, detects a load applied to the detection pipe, and fixes the load detector at a predetermined position. And a fixed part fixed to the upstream pipe and / or the downstream pipe, and the flow rate of the granular material is measured based on the value detected by the load detector. It is a measuring device.

  Furthermore, the present invention is the granular material flow rate measuring device, wherein the load detector is a load cell. The present invention provides the granular material flow rate measuring device, wherein the detection tube has a resistance projection which becomes a resistance against the flow path of the granular material so as to generate a component force in the load direction on the inner wall thereof. is there. The present invention is the particulate flow rate measuring device, wherein the shape of the resistance protrusion is a rhombus or a bowl shape in a plan view. The present invention is the particulate flow rate measuring device, wherein the input pipe or the discharge pipe is a straight pipe, a curved pipe or a different diameter pipe.

  In the present invention, a part of the pipe forming the flow path of the granular material is used as a detection pipe that is held in a non-contact state with respect to the pipes before and after the pipe, and the load applied to the detection pipe is detected by a load detector. Since the flow rate of the granular material can be measured, there is no need for a receiving plate or the like as in the conventional apparatus, and even if the measurement target is powder, it can be prevented from being deposited and stacked, and the flow rate can be reduced. Accurate measurement is possible.

  In addition, since the present invention can adjust the inclination angle and the pipe diameter of the pipe before and after the detection pipe by providing the input pipe and the discharge pipe, the detection pipe is connected to various pipes by connecting them. Moreover, the detection sensitivity of the load applied to the detection tube can be increased by forming the resistance protrusion on the detection tube.

It is a side view which shows the state which connected the granular material flow volume measuring apparatus of this invention to the upstream piping and downstream piping. It is explanatory drawing which shows the mode at the time of the measurement in the granular material flow volume measuring apparatus of this invention. It is a block diagram of the test apparatus of this invention. It is explanatory drawing which shows 2nd Embodiment of this invention, and is a figure equivalent to sectional drawing. It is explanatory drawing which shows the resistance protrusion of this invention, and is a figure equivalent to a perspective view. It is a graph which shows the measurement result in Example 1 of this invention. It is a graph which shows the measurement result in Example 2 of this invention. It is a graph which shows the measurement result in Example 3 of this invention.

  A first embodiment of the present invention will be described with reference to FIGS. First, the configuration of the granular material flow rate measuring device 1 will be described.

  The granular material flow rate measuring device 1 is provided between a newly installed or existing upstream pipe 2 and a downstream pipe 3, and includes a detection pipe 4, an input pipe 8, a discharge pipe 9, a fixed portion 5, and a load cell as a load detector. 6 and a display 7 and the like.

  The input pipe 8 is connected to the tip 2a of the upstream pipe 2 in order to connect the detection pipe 4 to the upstream pipe 2 and the discharge pipe 9 is connected to the downstream pipe 3 using the detection pipe 4 as a pipe. In order to do this, it is connected to the base end 3a of the downstream pipe 3. The shapes of the input pipe 8 and the discharge pipe 9 can be appropriately selected according to the shapes of the upstream pipe 2, the detection pipe 4, and the downstream pipe 3, for example, the upstream pipe 2 and the downstream pipe 3 When the tube diameter is different from the tube diameter of the detection tube 4, a different diameter tube is used, and when the installation angle of the upstream pipe 2 or the downstream pipe 3 is different from the inclination angle θ of the detection tube 4, the tube is bent. can do.

Sensing tube 4 is a tube body tapered tapering, large and the outer diameter ED ₁ is discharge pipe at the tip 4b than the outer diameter ED ₂ inner diameter ID ₁ of the base end 4a the tip 8a of the feeding pipe 8 9 is formed to be smaller than the inner diameter ID ₂ of the base end 9a (that is, ID ₁ > ED ₂ and ED ₁ <ID ₂ ).

  The detection tube 4 is inserted into the proximal end 4a of the distal end 8a of the input tube 8, and the distal end 4b of the detection tube 4 is inserted into the proximal end 9a of the discharge tube 9. The flow path of the granular material P is formed together with the discharge pipe 9 and the downstream pipe 3 (hereinafter, the connecting portion between the detection pipe 4 and the input pipe 8 is connected to the insertion portion 10 and the detection pipe 4 and the discharge pipe 9) The location is referred to as the insertion portion 11).

  Furthermore, in order to detect the load W applied to the detection tube 4 by the granular material P as described later (refer to paragraph [0023] for details), the detection tube 4 is not connected to the input tube 8 and the discharge tube 9. It is held in contact and is connected to the input pipe 8 and the discharge pipe 9 as a pipe line while being inclined with respect to the horizontal plane H. In addition, the inclination angle θ of the detection tube 4 can be set as appropriate depending on the particle size and other properties of the measurement object, and is set to about 35 ° for a granular material and about 60 ° for a powder.

  In this embodiment, in order to prevent the granular material P from leaking from a gap (not shown) between the detection tube 4 and the input tube 8 or the discharge tube 9, the insertion portions 10 and 11 are connected to the connection tubes 12 or 13. The connection tubes 12 and 13 are fixed to the detection tube 4 and the input tube 8 or the discharge tube 9 by a band 14. That is, since the gap is cut off from the outside by the connection tube 12 or 13, leakage of the powder P can be prevented.

  The load cell 6 supports the detection tube 4, the input tube 8, and the discharge tube 9 through the detection unit 6 a so as to maintain a non-contact state and the inclination angle θ of the detection tube 4. This is for detecting the load W applied to the detection tube 4. Then, the detection result is output to the display device 7 connected to the load cell 6. In the present embodiment, the detection portion 6 a of the load cell 6 is attached to the substantially central portion of the lower surface 4 c of the detection tube 4. That is, the detection tube 4 is supported from below by the detection unit 6 a of the load cell 6.

  The fixing portion 5 is provided to fix the load cell 6 at a predetermined position and to the input pipe 8 and the discharge pipe 9. In the present embodiment, the fixing portion 5 is a substantially U-shaped fixing bracket, is laid so as to straddle the detection tube 6 between the input tube 8 and the discharge tube 9, and is fixed by clamps provided at both ends. ing.

Depending on the installation angle and the pipe diameter of the upstream pipe 2 and the downstream pipe 3, the detection pipe 4 can be directly connected to the upstream pipe 2 or the downstream pipe 3 as a pipeline. In this case, the inner diameter ID ₁ of the base end 4 a of the detection pipe 4 is larger than the outer diameter ED _{3 of the} front end 2 a of the upstream side pipe 2, and the outer diameter ED ₁ of the front end 4 b is the base end of the downstream side pipe 3. It is formed to be smaller than the inner diameter ID _{3 of} 3a (that is, ID ₁ > ED ₃ and ED ₁ <ID ₃ ). Further, the fixed portion 5 is installed between the upstream side pipe 2 and the downstream side pipe 3 so as to straddle the detection pipe 6.

  Next, operation | movement of the granular material flow volume measuring apparatus 1 is demonstrated. When the granular material P is introduced into the detection tube 4 from the upstream side pipe 2 through the introduction tube 8, the load W applied to the detection tube 4 dynamically changes in accordance with the amount of introduction. The detection unit 6 a of the load cell 6 is displaced according to the change in the load W, and the load cell 6 outputs a detection value corresponding to the displacement amount to the display unit 7. The display 7 calculates a flow rate value (weight of the granular material per unit time), an integrated value (total weight of the flowed granular material) and the like based on the detected value and displays the result.

  In the present embodiment, a discharger such as a screw conveyor (for example, screw conveyor 16 of the test apparatus 15) provided upstream of the detection tube 4 and discharging the powder P to the upstream pipe 2, and the display 7 If it is made to interlock | cooperate, it is also possible to control the discharge | emission amount of the granular material P based on this measurement result, and to perform flow volume automatic control.

  A second embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment is that a resistance protrusion 19 is provided on the detection tube 4. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  The resistance protrusion 19 is a substantially rhomboid or substantially hook-shaped protrusion in plan view, and is provided on the lower surface 4c side of the detection tube 4 so that one diagonal line thereof runs along the direction in which the powder P flows down. That is, the resistance protrusion 19 becomes a resistance when the granular material P is put into the detection tube 4 and flows down in the detection tube 4.

In the present embodiment, the granular material P is introduced from the upstream side pipe 2 through the introduction tube 8 into the detection tube 4, and when the granular material P flows down to the resistance projection 19 in the detection tube 4, the resistance projection 19 is formed. becomes a resistor, a flow path C of granular material P is divided into the channel C ₁ and C _2. At that time, a resistance force f acting vertically downward is generated in accordance with the amount of the powder P. That is, in the present embodiment, when measuring the flow rate of the granular material P, the detection unit 6a of the load cell 6 is displaced according to the change in the sum (W + f) of the load W and the resistance force f applied to the detection tube 4, The load cell 6 outputs a detection value corresponding to the displacement amount to the display unit 7.

  Therefore, in the present embodiment, the flow rate of the granular material P can be measured with higher sensitivity because the resistance force f is generated than in the first embodiment.

  Hereinafter, examples corresponding to the present embodiment will be described. First, the used test apparatus 15 will be described with reference to FIG. The test device 15 includes an inverter-driven bucket elevator 17, a hopper 18, an inverter-driven screw conveyor 16, and a granular material flow rate measuring device 1. In the test apparatus 15, first, the granular material P is placed in a bucket (not shown) in the bucket elevator 17 at the lower part of the bucket elevator 17, and is vertically transported toward the upper part of the bucket elevator 17. And the granular material P is discharged | emitted from the bucket to the hopper 18 by the upper part of the bucket elevator 17. FIG.

  The granular material P discharged from the bucket elevator 17 is supplied to the screw conveyor 16 via the hopper 18, and further, the granular material P is supplied from the screw conveyor 16 to the upstream pipe 2 to measure the granular material flow rate. It flows to the apparatus 1 and the downstream pipe 3. In the test apparatus 15, the downstream end of the downstream pipe 3 is connected to the lower part of the bucket elevator 17 so that the granular material P can circulate in the test apparatus 15.

  In addition, the graph (FIGS. 6 to 8) of the measurement results of each example shows the average of the integrated values in the measurement time 30 s repeatedly measured with respect to the change in the supply amount of the powder P (the rotation speed (Hz) of the screw conveyor 42). It represents the relationship with the value. If the powder accumulates in the detection tube 10, the error of the integrated value becomes larger as the powder supply amount increases. Therefore, the graph shows more linearity as the amount of deposited powder is smaller.

・ Powder: New powder (particle size ≒ 300 μm)
・ Inclination angle of detection tube 4: θ = 57 °
・ Rotation speed of screw conveyor 16: 28 Hz (discharge amount ≒ 0.75 kg / s), 24 Hz (discharge amount ≒ 0.60 kg / s), 18 Hz (discharge amount ≒ 0.49 kg / s), 12 Hz (discharge amount ≒ 0.33 kg / s)

  A first embodiment of the present invention will be described with reference to FIG. This example is an example in the case where a super fresh powder (particle size≈300 μm) is passed and the integrated value is measured. The average integrated value showed linearity with respect to the amount of powder supplied. This result shows that the upper fresh powder flows in the detection tube 4 without accumulating, and an integrated value corresponding to the flow rate of the upper fresh powder is obtained.

・ Powder: Wheat flour (thin 2nd flour)
・ Inclination angle of detector tube 4: θ = 60 °
・ Rotation speed of screw conveyor 16: 24 Hz (discharge amount ≈ 0.44 kg / s), 18 Hz (discharge amount ≈ 0.34 kg / s), 12 Hz (discharge amount ≈ 0.23 kg / s), 6 Hz (discharge amount ≒ 0.14 kg / s)

  A second embodiment of the present invention will be described with reference to FIG. The difference from the first embodiment is that wheat flour (thin flour second grade) finer than upper fresh flour was used as the powder. Also in this case, the graph showed linearity as in the case of the upper fresh flour, and even if it was wheat flour, an integrated value corresponding to the flow rate was obtained without accumulating in the detection tube 4.

・ Powder: Wheat flour (thin 2nd flour)
・ Inclination angle of detector tube 4: θ = 60 °
・ Rotation speed of screw conveyor 16: 24 Hz (discharge amount ≈ 0.44 kg / s), 18 Hz (discharge amount ≈ 0.34 kg / s), 12 Hz (discharge amount ≈ 0.23 kg / s), 6 Hz (discharge amount ≒ 0.14 kg / s)

  A third embodiment of the present invention will be described with reference to FIG. The difference from the second embodiment is that a resistance projection 19 having a substantially rhombic shape in plan view is provided on the detection tube 4. In this case as well, as in Example 2, the average integrated value showed linearity with respect to the amount of powder supplied. Each average integrated value in Example 3 was about twice the corresponding average integrated value in Example 2. As a result, even if the resistance projection 19 is provided on the detection tube 4, the flour (thin powder, etc.) flows without accumulating, and by providing the resistance projection 19, the sensitivity can be doubled. It shows what you can do.

  As described above, the present invention is provided with the detection pipe 4 held in a non-contact state while being inclined between the input pipe 8 and the discharge pipe 9 or the upstream side pipe 2 and the downstream side pipe 3. By dynamically detecting the load applied to the detection tube 4 in such a state with the load cell 6, even if the powder is flowed, it is possible to prevent the accumulation of the powder, and to accurately measure the flow rate. Is possible. And naturally, it is possible to accurately measure the flow rate of particles that are coarser than the powder and are difficult to deposit.

  In addition, this invention is not limited to the above-mentioned embodiment. The detection portion 6a of the load cell 6 may be attached to the upper surface 4d side of the detection tube 4, and the detection tube 4 may be supported by the load cell 6 so as to be suspended by the detection portion 6a. The position can also be changed as appropriate. Further, the fixing portion 5 only needs to hold the load cell 6 in a predetermined position, and only one end thereof may be fixed to one of the upstream pipe 2 or the downstream pipe 3, and the shape thereof can be changed as appropriate. is there.

DESCRIPTION OF SYMBOLS 1 Powder flow rate measuring apparatus 2 Upstream side pipe 2a Tip 3 Downstream side pipe 3a Base end 4 Detection pipe 4a Base end 4b Tip 4c Bottom face 4d Top face 5 Fixed part 6 Load cell 6a Detection part 7 Display 8 Input pipe 8a Tip 9 Discharge Tube 9a Base end 10 Insertion section 11 Insertion section 12 Connection tube 13 Connection tube 14 Band 15 Test device 16 Screw conveyor 17 Bucket elevator 18 Hopper 19 Resistance projection θ Inclination angle H Horizontal plane ID Inner diameter ED Outer diameter C Powder channel P Powder Granule f Resistance W Load

Claims (6)

An input pipe connected to the upstream pipe;
A discharge pipe connected to the downstream pipe;
A detection tube that is provided between the input pipe and the discharge pipe and is inclined to form a flow path of the granular material together with the upstream pipe, the input pipe, the discharge pipe, and the downstream pipe;
A load detector for supporting the detection tube so as to maintain a non-contact state between the detection tube and the input tube and the discharge tube, and detecting a load applied to the detection tube;
A fixing portion for fixing the load detector at a predetermined position and fixing the load detector to the input pipe and / or the discharge pipe;
A granular material flow rate measuring apparatus that measures the flow rate of the granular material based on a value detected by the load detector. A detection pipe that is provided between the upstream pipe and the downstream pipe, and that forms a flow path of the granular material together with the upstream pipe and the downstream pipe;
A load detector for supporting the detection pipe so as to maintain a non-contact state between the detection pipe and the upstream pipe and the downstream pipe, and detecting a load applied to the detection pipe;
A fixing portion for fixing the load detector at a predetermined position and fixing the load detector to the upstream pipe and / or the downstream pipe;
A granular material flow rate measuring apparatus that measures the flow rate of the granular material based on a value detected by the load detector.   The granular material flow rate measuring apparatus according to claim 1 or 2, wherein the load detector is a load cell.   4. The powder according to claim 1, wherein the detection tube has a resistance projection that becomes a resistance to the flow path of the granular material so as to generate a component force in the load direction on the inner wall thereof. Granule flow rate measuring device.   5. The granular material flow rate measuring apparatus according to claim 4, wherein the shape of the resistance protrusion is a rhombus or a bowl shape in a plan view.   6. The granular material flow rate measuring apparatus according to claim 1, wherein the input pipe or the discharge pipe is a straight pipe, a curved pipe or a different diameter pipe.

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