JP2022163273A - Behavior evaluation device for powder or mixed phase object - Google Patents

Abstract

To provide an evaluation device suitable for evaluating behavior of powder or a mixed phase object of a solid and a liquid in an actual application.SOLUTION: A behavior evaluation device is configured to grasp behavior of powder or a mixed phase object while transporting it along a direction of a predetermined axial line A not perpendicular, and includes: a screw 1 in which a blade 12 is spirally provided around a shaft 11 that extends along the direction of the axial line A and that transfers the powder or the mixed phase object by a blade 12 by rotating about the shaft 11; a body 2 that extends along the direction of the axial line A, and houses the screw 1 therein, where the powder or the mixed phase object is input at a base end side, flows toward a tip side therein, and is discharged to outside at the tip end side; a motor 4 for rotating and driving the screw 1; and a torque meter 5 that is interposed between the screw 1 and the motor 4 and measures a magnitude of the torque applied to the screw 1 when the screw 1 is rotated and the powder or the mixed phase object is transported.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an apparatus for evaluating the behavior of powder or a mixed phase of solid and liquid while transferring the powder.

Devices for pushing powder or mixed phases by means of a screw feeder (or conveyor) or the like and packing them in bags are well known (see, for example, Patent Document 1 below). In developing and designing this type of equipment, it is desirable to grasp the behavior based on the properties of the target powder or mixed phase as accurately as possible.

One method for quantitatively evaluating the fluidity (or viscosity) of powder is Carr's fluidity index. Carr's fluidity index evaluates the target powder in four items: degree of compression, angle of repose, angle of spatula, and degree of cohesion (uniformity for powders with low cohesion), and the values of these four items It is an index value indicating the fluidity of the powder, which is the sum of

Carr's Liquidity Index is arranged to comprehensively evaluate liquidity from multiple aspects. However, Carr's fluidity index is an index value under static conditions in which no forcible external force acts on the powder other than its own weight. In general, fluidity under dynamic conditions in which an external force is applied to powder inside equipment and it is pumped, is such that the powder is compressed, and intermolecular forces (adhesion, etc.) increase and friction increases. are assumed to be worse than under static conditions. Therefore, Carr's Flowability Index alone is insufficient for developing and designing equipment for transferring powders.

To quantitatively evaluate the dynamic properties of powder, a sample of the target powder is placed in a container, and a propeller-shaped blade placed on the top of the sample is rotated at high speed to circulate the powder in the container. There is a device that performs measurement while stirring and mixing powder and air by winding it up (see, for example, Non-Patent Document 1 below). This measuring device measures the torque, which is rotational resistance, and the load, which is vertical resistance, received by the blade in the process of moving the blade up and down within the container.

It should be noted that the above measuring equipment only obtains the characteristics (viscosity and shear force) measured using a small amount of sample, and furthermore, the characteristics under the condition of stirring with air in a container. not. On the other hand, in practical equipment, a large amount of powder or mixed phase material is pumped while pushing out the air contained therein. In order to utilize the results of measurement by the former measuring device in the development and design of the latter practical equipment, the relationship for converting the characteristic values obtained from a small amount of sample into the behavior when pumping a large amount of target I need to find the formula.

However, the behavior of powders or heterogeneous mixed phases varies remarkably depending on the amount and other conditions. Therefore, it is practically difficult to formulate the above relational expression, and it is by no means easy to utilize the results of measurement by the above-described measuring apparatus in the development and design of practical equipment. In short, the behavior of powders or mixed phases in practical equipment is unclear; for example, the flow rate of powders or mixed phases pumped by the equipment and the amount of power (output) required to pump it , the possibility of clogging with powders or mixed phases in the equipment, etc., are difficult to estimate or assess. It can be said that the measurement by the above-mentioned measuring device is likely to deviate from the reality of the field.

JP 2008-101955 A

“Powder Rheometer (TM) FT4” (POWDER RHEOMETER is a registered trademark), [online], 2nd year of Reiwa, Freeman Technology Limited, [searched on February 28, 3rd year of Reiwa], Internet <URL: https:/ /www.powderflow.com/en/ft4-powder-rheometer-universal-powder-tester＞

The present invention aims at realizing an evaluation device suitable for evaluating the dynamic behavior of powders or mixed-phase materials in practical applications.

In the present invention, powder (an aggregate of fine solids, including an aggregate of particles such as so-called granules and an aggregate of powder smaller than the particles. Two or more types of powder are mixed Powder is also a type of powder) or a mixed phase of solid and liquid (mixed phase fluid. Especially, the mixed state is heterogeneous or heterogeneous. A suspension that is a dispersion system in which solid particles are dispersed in a liquid). It is used to grasp the behavior of turbid liquid, slurry or sludge (including highly viscous mixtures of minerals, sludge, etc. mixed in the liquid) while transferring it along a predetermined non-vertical axial direction. , a screw that is spirally provided with blades around an axis extending along the axial direction, and that rotates about the shaft to transfer the powder or mixed phase material by the blades; The screw is accommodated inside, and powder or mixed phase material is introduced into the base end side, flows inside toward the tip side, and the powder or mixed phase material is discharged to the outside at the tip end side. It is interposed between the body, the motor for rotating the screw, and the screw and the motor, and measures the magnitude of the torque applied to the screw when the screw is rotated to transfer the powder or mixed phase material. A behavior evaluation device equipped with a torque meter was constructed.

The shaft of the screw is rotatably supported by bearings at its base end side, but is preferably not supported by bearings or other members at its distal end.

This behavior evaluation device may be detachably attached to the tip side of the body and provided with a nozzle through which the powder or mixed phase material discharged from the body is passed.

The nozzle may have a shape that narrows forward. Therefore, it is preferable to be able to change the opening cross-sectional area of the tip or the length dimension along the axial direction (the inclination angle of the taper of the inner surface of the nozzle with respect to the axis) by exchanging the nozzle.

It is also preferable that the screw is replaceable and that the pitch of the blades can be changed by replacing the screw.

The pitch of the blades of the screw is preferably smaller than the inner diameter of the inlet opened on the base end side of the powder.

In the case of providing an injector connected to the inlet opened at the proximal end of the barrel and capable of storing the powder or mixed phase material to be charged into the barrel, the internal volume of the injector is the content of the barrel. preferably greater than the product.

ADVANTAGE OF THE INVENTION According to this invention, the evaluation apparatus suitable for evaluating the dynamic behavior of a powder or a mixed-phase material in an actual use can be implement|achieved.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the behavior evaluation apparatus of one Embodiment of this invention. Sectional drawing which shows the aspect which employ|adopted the hopper as an injection device of the behavior evaluation apparatus of the embodiment. Sectional drawing which expanded the front-end|tip part which shows the aspect which employ|adopted what differs in a shape as a nozzle of the behavior evaluation apparatus of the same embodiment. Sectional drawing which shows the aspect which employ|adopted as the screw of the behavior evaluation apparatus of the same embodiment the thing with a different pitch of a blade|wing. The graph which illustrates the result of having measured the torque added to the screw when pumping powder with the behavior evaluation apparatus of the same embodiment. The graph which illustrates the result of having measured the torque added to the screw when pumping powder with the behavior evaluation apparatus of the same embodiment. The graph which illustrates the result of having measured the torque added to the screw when pumping powder with the behavior evaluation apparatus of the same embodiment. The side view which shows an example of the screw of the behavior evaluation apparatus of the same embodiment, and its blade|wing.

One embodiment of the present invention will be described with reference to the drawings. The behavior evaluation device of the present embodiment is a property evaluation device used for quantitatively evaluating properties including dynamic behavior while transferring powder or a mixed phase material (multiphase fluid). As shown in FIG. 1, this behavior evaluation device includes a screw 1 having spiral blades 12 around a shaft 11 extending along the direction of the axis A, and a screw 1 extending along the direction of the axis A. A body 2 housing a screw 1 therein, and an injector 3 connected to an inlet 21 opened on the base end side of the body 2 and capable of storing powder or a mixed phase material to be fed into the body 2. , a motor 4 serving as a power source for rotationally driving the screw 1, and a torque meter 5 interposed between the screw 1 and the motor 4 as main components.

This behavior evaluation device, just like an existing screw feeder, rotates the screw 1 and causes the powder or mixed phase material introduced from the inlet 21 to flow inside the body 2, and the base end along the axis A direction It pushes from the side toward the tip side. The direction of the axis A is not vertical, but horizontal or substantially horizontal. However, it does not prevent the direction of the axis A from being inclined with respect to the horizontal direction.

The body 2 has an elongated, substantially cylindrical shape, and an inlet 21 opening upward is bored in the peripheral wall thereof. The screw 1 is inserted into the body 2 along the direction of the axis A from the proximal side. It should be noted that the body 2 is not limited to being cylindrical in its entirety, and may be trough-shaped with at least a portion thereof open upward.

The blades 12 of the screw 1 have a helical shape or a male screw shape that continues around the shaft 11 for at least two turns. This screw 1 is cantilevered. Specifically, the shaft 11 of the screw 1 is rotatably supported by a bearing 22 at a position closer to the proximal side than the inlet 21 of the body 2. It is not supported by other members, i.e. does not touch other members including the fuselage 2.

The injector 3 stores, for example, a little less than 1 kg, about 350 g to 800 g of powder or a mixed phase material. This injector 3 is connected to an inlet 21 on the base end side of the body 2 from a direction intersecting or perpendicular to the direction of the axis A along which the screw 1 and the body 2 extend. Then, the powder or mixed phase material stored inside is dropped into the body 2 along the same direction. The injector 3 of the example shown in FIG. 1 has a tubular shape extending vertically or substantially vertically. However, as shown in FIG. 2, the injector 3x may be a funnel-shaped or inverted cone-shaped hopper that gradually narrows downward toward the body 2 . Also, the inserters 3 and 3x may be tilted with respect to the vertical direction.

A shutter 31 that can be opened and closed is attached to a portion of the injectors 3 and 3x near the inlet 21 of the body 2 . When the shutter 31 is closed, the inside of the injectors 3, 3x is isolated from the interior of the body 2 by the shutter 31, and the powder or mixed phase material stored in the injectors 3, 3x is injected into the injectors 3, 3x. It stays and does not fall into the body 2. By opening the shutter 31, the inside of the injectors 3, 3x communicates with the inside of the body 2 through the inlet 21, and the powder or mixed phase material stored in the injectors 3, 3x drops into the body 2. become.

The volume inside the injectors 3, 3x that store the powder or the mixed phase is larger than the volume inside the body 2 through which the powder or the mixed phase flows. In addition, the inner diameter D of the inlet 21 is the pitch P of the blades 12 of the screw 1 located directly under it, that is, the separation distance along the axis A direction between adjacent blades 12 along the axis A direction ( spacing between threads).

The torque meter 5 is a known device capable of measuring the magnitude of torque acting on the screw 1 rotated by the motor 4 . The torque meter 5 is wired or wirelessly connected to an information processing device such as a personal computer or a work station, and the time series of torque values output by the torque meter 5 can be recorded in the information processing device. The shaft 11 of the screw 1 and the torque meter 5 and the torque meter 5 and the output shaft 11 of the motor 4 are connected by couplings 51 and 52, respectively. The shaft 11 of the screw 1, the output shaft 11 of the torque meter 5 and the motor 4 are arranged on the same or substantially the same axis line A.

The motor 4 can continuously or intermittently change its rotation speed, torque, and output through an inverter. In this behavior evaluation device, the rotation speed of the screw 1 for transferring the powder or the mixed phase material or the motor 4 for driving it is, for example, 20 rpm to 120 rpm. This is slower than the practical rotation speed (generally 900 rpm to 1000 rpm) of the screw 1 or the motor 4 of a screw feeder used for transferring powder or mixed phases.

The tip side of the body 2 is open, and the powder or mixed phase material flowing inside the body 2 is discharged to the outside of the body 2 from the tip side. A nozzle 6 is attached to the tip side of the body 2 as required. The nozzle 6 has a shape constricted toward the front, and has an opening at its tip through which the powder or mixed phase material discharged from the body 2 passes. The cross-sectional area of the opening at the tip of the nozzle 6 is narrower than the cross-sectional area of the interior of the body 2, in other words, the cross-sectional area of the opening on the tip side of the body 2 when the nozzle 6 is not attached.

The nozzles 6 and 6x are detachable from the body 2, that is, they are replaceable. As a result, the opening cross-sectional area of the tip, the length dimension along the axis A direction (or the inclination angle of the taper of the inner surface of the nozzle 6, 6x with respect to the axis A), the material (processing condition of the inner surface, friction or resistance), etc. different nozzles 6, 6x can be selected as appropriate. FIG. 1 shows a mode in which the opening cross-sectional area of the attached nozzle 6 is narrowed down to be smaller than the internal cross-sectional area of the body 2 . FIG. 3 represents a mode in which the opening cross-sectional area of the installed nozzles 6 , 6 x is equivalent to the cross-sectional area inside the fuselage 2 .

The screws 1 and 1x are also removable from the body 2 and the torque meter 5, that is, they can be replaced. As a result, the screws 1 and 1x having different pitches P of the blades 12 and different materials (surface processing state, friction or resistance) can be appropriately selected. In particular, the pitch P of the blades 12 is not necessarily uniform or substantially uniform throughout the screw 1, and as shown in FIG. It is also possible to employ a screw 1x that is narrower than .

Incidentally, when the object to be evaluated is not powder, which is a collection of minute solids, but a mixed phase of solid and liquid, the shutter 31, the connecting portion between the injectors 3 and 3x and the inlet 21, the bearing 22, It is preferable to previously apply a seal or the like necessary to prevent leakage of the target mixed-phase substance to the connecting portions between the body 2 and the nozzles 6 and 6x. It is also preferable to set the direction of the axis A to an angle or posture suitable for the process of transferring the target mixed-phase material.

When using this behavior evaluation device, the powder or mixed phase material to be evaluated is poured into the injectors 3 and 3x with the shutter 31 closed, and the motor 4 is started to rotate the screws 1 and 1x. The closed shutter 31 is opened and powder or mixed phase material is introduced into the body 2 from the injector 3, the magnitude of the torque applied to the screws 1 and 1x is measured by the torque meter 5, and the time series of the torque value is calculated. get.

5 and 6 exemplify the time series of torque values measured by the torque meter 5 during an experiment of transferring powder using this behavior evaluation device. In FIGS. 5 and 6, the solid line shows the transition of the torque applied to the screw 1 when the white fused alumina is transferred, the dashed line indicates the transfer of the glass beads, and the dashed line indicates the transfer of the powdered sugar. On top of that, FIG. 5 shows the transition of the torque when the nozzle 6x (shown in FIG. 3) whose opening cross-sectional area is equivalent to the cross-sectional area inside the body 2 is attached to the tip side of the body 2 and the powder is pumped. represents. FIG. 6 shows the transition of the torque when powder is pumped by attaching a tapered nozzle 6 (shown in FIG. 1) whose opening is narrower than the opening cross-sectional area inside the body 2 (shown in FIG. 1) to the tip side of the body 2. there is

According to this behavior evaluation device, it is possible to actually measure transitions and changes in the torque applied to the screws 1 and 1x during the process of transferring an actual mass of powder or mixed phase material. Since the number of revolutions of the screws 1 and 1x is also known, it is possible to calculate the magnitude of the power (output) required for the process of transferring the powder or mixed phase material.

This behavior evaluation device reproduces the same situation as a device that pushes powder or mixed phases with a screw feeder etc. at the actual site. Accurately grasp the fluidity or viscosity and other properties, more specifically, the flow rate of the powder or mixed phase to be pumped, the power supplied to pump it, the powder or It can contribute to observing, estimating or evaluating the possibility of plugging with mixed phases, the degree of mixing and segregation, and the like.

When the narrowed nozzle 6 is attached to the body 2, the resistance received by the powder or mixed phase flowing in the body 2, and the resistance applied to the screws 1, 1x for pumping it, is greater than when it is not. becomes larger. In the example shown in FIG. 6, the torque value measured by the torque meter 5 is relatively small before time T. This is the period during which the liquid is being transferred toward the side but has not yet reached the nozzle 6 . The torque value measured during this period indicates the magnitude of the resistance itself that must be overcome in order to pump the powder or mixed material in the barrel 2 .

On the other hand, after time T is a period after the powder introduced into the body 2 from the injector 3 reaches the nozzle 6 . The torque value after time T indicates the amount of resistance that must be overcome to force the powder or mixed phase through the constricted nozzle 6 .

In the example in which the target powder is white fused alumina (solid lines in FIGS. 5 and 6), the powder receives a large resistance from the constricted nozzle 6 after time T, thereby causing a rapid increase in the torque acting on the screw 1. ing. However, the torque settles after maximization and gradually decreases afterward. This means that the powder continued to be discharged from the opening at the tip of the nozzle 6 while receiving resistance from the nozzle 6 , and finally almost all of the powder was discharged from the inside of the body 2 .

In the example in which the target powder is powdered sugar (one-dot chain lines in FIGS. 5 and 6), the torque acting on the screw 1 rapidly increases after time T and diverges without converging. In this example, the powder is clogged inside the nozzle 6 or inside the body 2 , which prevents the powder from being properly discharged from the opening of the nozzle 6 .

In this way, this behavior evaluation device clarifies the dynamic behavior and properties of the target powder or mixed-phase material when it is transferred, based on the time-series change in the torque value. For example, it is possible to observe at what flow rate the target powder or mixed-phase material flows, whether clogging may occur, where clogging occurs, and the like. The flow rate, susceptibility to clogging, and the like naturally differ depending on the type of target powder or mixed-phase material. This behavior evaluation device is useful for examining the shape of the nozzles 6, 6, the specifications of the screws 1, 1, etc. so as not to cause clogging.

As illustrated in FIG. 8, the blades 12 of the screws 1, 1x are inclined with respect to the axis A, which is the direction of transport of the powder or mixed phase material of interest. The vane 12 is a "ramp" for the powders or mixtures of interest, on which the powder or mixture will avalanche, slide or roll over the vane 12 . In addition to this, the powder or mixed phase is compressed by the blades 12 during the transfer process, friction occurs between the solids constituting the powder or mixed phase, or between the solid and the liquid, or the blades 12, the body 2, or It is pressed against the inner surface of the nozzle 6 and friction is generated therebetween. The screw feeder-like structure adopted by this behavior evaluation device is a general-purpose or Comprehensive.

The results of measurement by this behavior evaluation device are suitable not only for screw feeders but also for designing and developing hoppers, extruders and other equipment. FIG. 7 shows the time series of torque values measured while transferring powder using this behavior evaluation device and the time series of torque values calculated by CAE (Computer-Aided Engineering) simulation. be. In FIG. 7, the solid line represents an example of transition of the measured torque value, and the dashed-dotted line represents an example of the calculation result of the torque value by CAE simulation. CAE conforms to known DEM (Discrete Element Method, or PEM (Particle Element Method)), SPM (Smoothed Particle Method), or the like, for example.

Supplementally, the torque value measured using this behavior evaluation device is compared with the results of a CAE simulation of the transfer of powder or mixed phase material by a device with the same structure and specifications as this behavior evaluation device. , By adjusting the characteristic values of the powder or mixed phase on CAE so that the latter approaches the former, it is possible to accurately estimate or identify the dynamic characteristic values of the target powder or mixed phase. is. The characteristic values referred to here are, for example, viscosity, adhesive force (van der Waals force), spring constant (Young's modulus, hardness), rotational resistance (rolling resistance), density (true density, particle density, bulk density). , Friction between solids that make up the powder or mixed phase or between solid and liquid, Friction between powder or mixed phase and other objects (screw 1, 1x, body 2, nozzle 6, 6x, etc.) , coefficient of restitution when the powder or mixed phase material collides with another object, and the like. The characteristic values of the estimated or identified target powder or mixed phase can be used in CAE simulations for developing and designing screw feeders and equipment other than screw feeders, such as hoppers.

In this embodiment, the powder or mixed phase is transported along a predetermined axis A direction that is not vertical, and its properties are quantitatively evaluated. A blade 12 is provided in a shape, and screws 1 and 1x for transferring powder or mixed phase material by rotating around the shaft 11, and extending along the direction of the axis A, inside the A body 2 that accommodates the screws 1 and 1x, in which powder or a mixed phase material is introduced into the base end side, flows inside toward the tip side, and discharges the powder or mixed phase material to the outside at the tip end side; A motor 4 for rotating the screws 1, 1x, and a motor 4 interposed between the screws 1, 1x and the motor 4 to rotate the screws 1, 1x to transfer the powder or mixed phase material. , and a torque meter 5 for measuring the magnitude of the torque applied to 1x.

According to the behavior evaluation apparatus of the present embodiment, it is possible to accurately evaluate properties such as dynamic fluidity of powders or mixed-phase materials in actual applications, which has never been easy in the past. That is, the behavior of the powder or mixed phase when actually pumping and flowing a certain amount of powder or mixed phase is observed, and the flow rate of the powder or mixed phase that is pumped by the device and the flow rate of the powder or mixed phase. It is possible to actually measure or estimate the magnitude of the power required for this, the possibility of clogging with powder or mixed phases in the equipment, and the like. In other words, it becomes possible to predict the behavior when the target powder or mixed phase material is transferred, and the results can be utilized in the design of equipment including the transfer mechanism for the powder or mixed phase material.

The behavior of a powder or mixed phase to be pumped can be said to be complex or non-linear. The difficulty of predicting is not limited to the case of designing or manufacturing new equipment, but what kind of behavior it will show when powder or mixed phase material with different properties than before is put into existing equipment. This can be a headache for the operator of the equipment or facility when they have to consider For example, when powder placed on a slope flows down, the flow of powder does not occur unless there is some trigger. It is not clear what the trigger is and when it will occur, and it is possible that the powder will not flow well if the trigger does not occur.

However, by using this behavior evaluation device, it becomes possible to measure the time series of the torque value acting on the screw 1, which is an index highly correlated with the behavior of powders and mixed phases. For those who are in charge of designing and manufacturing equipment for transferring powders and mixed phases, it is also possible to quantitatively evaluate how well the design is working.

In the behavior evaluation device of this embodiment, the shaft 11 of the screw 1, 1x is rotatably supported by a bearing 22 at its base end side portion, and the bearing 22 and other parts at its tip end side portion. Not supported by members. With such a structure, the powder or mixed phase flowing inside the body 2 from the base end side to the tip end side is separated from members other than the body 2, the screws 1, 1x and the nozzle 6 (that is, the screws 1, 1x). It does not receive force or frictional resistance from bearings, etc., that support the shaft 11 . Therefore, the measured torque value does not contain noise other than those resistances.

Nozzles 6 and 6x for passing the powder or mixed phase material discharged from the body 2 can be attached to the tip side of the body 2 . The nozzles 6 and 6x can be arbitrarily attached to and detached from the body 2 . Therefore, whether the nozzle 6 narrower than the cross-sectional area of the inner hollow of the body 2 is present or when such a nozzle 6 is not present, the screw 1 for conveying the powder or mixed phase material , 1x can be evaluated. A nozzle 6 with a small opening cross-sectional area is intentionally attached to the body 2 to intentionally reduce the discharge flow rate of the powder or mixed phase material, and the ease of clogging and clogging of the powder or mixed phase material is evaluated. , can also be used to grasp It is also useful for evaluating the characteristics of the friction with powder or mixed phase material depending on the material of the nozzles 6, 6x and the processing state of the inner surface, and evaluating the change in resistance according to the size, shape, etc. of the opening at the tip of the nozzles 6, 6x.

The screws 1, 1x are also interchangeable. changing the pitch P, P′ of the blades 12 by exchanging the screws 1, 1x, and the length of time the powder or mixed phase to be transported is in contact with the blades 12 of the screws 1, 1x, or The size of the contact area can be intentionally changed. By conducting experiments in which multiple types of screws 1 are used to transfer the powder or mixed phase material, it is possible to evaluate the characteristics related to friction between the target powder or mixed phase material and the screws 1 and 1x.

In addition, the pitch P' of the blades 12 on the tip side (or the side close to the nozzle 6) of the body 2 where the powder or mixed phase material is discharged is changed to the base end side of the body 2 where the powder or mixed phase material is charged ( Alternatively, by making it narrower than the pitch P of the blades 12 on the side far away from the nozzle 6, the powder or mixed phase is compressed in the process of being pushed to the blades 12 of the screw 1x, and the dynamic characteristics during that can be evaluated.

If the pitch P of the blades 12 in the screws 1 and 1x is made smaller than the inner diameter D of the inlet 21 opened on the base end side of the powder, the powder is fed into the body 2 through the inlet 21. Powders or mixed phases can be finely dispersed and conveyed by screws 1, 1x. As a result, it is possible to suppress the generation of unreasonably large fluctuations in the torque value measured by the torque meter 5 due to the lump-like powder or mixed phase matter, and it is possible to measure the torque value stably.

The behavior evaluation device of the present embodiment includes injectors 3 and 3x connected to an inlet 21 opened on the base end side of the trunk 2 and capable of storing the powder or mixed phase material to be injected into the trunk 2. equipped. Since the internal volume of the injectors 3, 3x is larger than the internal volume of the body 2, the target powder or mixed phase material is continuously injected into the body 2 from the injectors 3, 3x for a certain period or more. can continue to supply In other words, it cannot be cut due to lack of powder or mixed phase. As a result, the rotating screws 1 and 1x continue to apply pressure to the powder or mixed phase material flowing in the body 2, and the torque value applied to the screw 1 during that time matches the actual situation at the site. It is possible to appropriately measure and quantitatively evaluate the fluidity and other properties of the mixed phase material.

The present invention is not limited to the embodiments detailed above. The specific configuration of each part can be modified without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1, 1x... Screw 11... Shaft 12... Blade 2... Body 21... Input port 22... Bearing 3, 3x... Input device 4... Motor 5... Torque meter 6, 6x... Nozzle A... Axis line D... Inner diameter of input port P... blade pitch

In the present invention, powder (an aggregate of fine solids, including an aggregate of particles such as so-called granules and an aggregate of powder smaller than the particles. Two or more types of powder are mixed Powder is also a type of powder) or a mixed phase of solid and liquid (mixed phase fluid. Especially, the mixed state is heterogeneous or heterogeneous. A suspension that is a dispersion system in which solid particles are dispersed in a liquid). It is used to grasp the behavior of turbid liquid, slurry or sludge (including highly viscous mixtures of minerals, sludge, etc. mixed in the liquid) while transferring it along a predetermined non-vertical axial direction. , a screw that is spirally provided with blades around an axis extending along the axial direction, and that rotates about the shaft to transfer the powder or mixed phase material by the blades; The screw is accommodated inside, and powder or mixed phase material is introduced into the base end side, flows inside toward the tip side, and the powder or mixed phase material is discharged to the outside at the tip end side. It is interposed between the body, the motor for rotating the screw, and the screw and the motor, and measures the magnitude of the torque applied to the screw when the screw is rotated to transfer the powder or mixed phase material. A torque meter and a nozzle that is detachably attached to the tip side of the body and allows the powder or mixed phase material discharged from the body to pass through, and the shaft of the screw is supported by a bearing on the base end side. Although it is rotatably supported, the tip portion is not supported by bearings or other members, the nozzle has a shape that narrows forward, and the inner surface of the nozzle has an inclination angle with respect to the axis. There are a plurality of different nozzles, and by replacing the nozzle, the opening cross-sectional area of the tip or the length dimension along the axial direction (the inclination angle of the taper of the inner surface of the nozzle with respect to the axis) is changed. A behavior evaluation device capable of measuring the magnitude of the torque applied to the screw for each nozzle by the torque meter was constructed.

It is preferable that the pitch of the blades of the screw is smaller than the inner diameter of the inlet opened on the base end side of the body .

If the pitch P of the blades 12 in the screws 1 and 1x is made smaller than the inner diameter D of the inlet 21 opened on the base end side of the body 2 , the blades are introduced into the body 2 through the inlet 21. The powder or mixed phase can be finely dispersed and conveyed by screws 1, 1x. As a result, it is possible to suppress the generation of unreasonably large fluctuations in the torque value measured by the torque meter 5 due to the lump-like powder or mixed phase matter, and it is possible to measure the torque value stably.

Claims (7)

It is for grasping the behavior while transferring powder or a mixed phase of solid and liquid along a predetermined non-vertical axis direction,
a screw provided with blades spirally around the shaft extending along the axial direction, and rotating about the shaft to transfer the powder or the mixed phase by the blades;
It extends along the axial direction, accommodates the screw inside, powder or a mixed phase material is put into the base end side, and this flows inside toward the tip side, and the powder or the mixed phase material flows inside toward the tip side. A body that discharges the mixed phase material to the outside,
a motor for rotating the screw;
A behavior evaluation device comprising a torque meter that is interposed between the screw and the motor and that measures the magnitude of torque applied to the screw when the screw is rotated to transfer the powder or mixed phase material. 2. The behavior evaluation device according to claim 1, wherein the shaft of said screw is rotatably supported by bearings at its proximal portion, but is not supported by bearings or other members at its distal portion. 3. The behavior evaluation device according to claim 1, further comprising a nozzle detachably attached to the front end of the body and allowing the powder or mixed phase material discharged from the body to pass through. 4. The behavior evaluation device according to claim 3, wherein the nozzle has a shape that narrows forward, and the opening cross-sectional area at the tip or the length dimension along the axial direction can be changed by exchanging the nozzle. 5. The behavior evaluation device according to claim 1, 2, 3 or 4, wherein the screw is replaceable and the pitch of the blades can be changed by replacing the screw. 6. A behavior evaluation device according to claim 1, 2, 3, 4, or 5, wherein the pitch of said blades in said screw is smaller than the inner diameter of an inlet opened on the base end side of said powder. A feeder connected to the feed port opened on the base end side of the body and capable of storing the powder or mixed phase material to be fed into the body,
7. The behavior evaluation device according to claim 1, 2, 3, 4, 5 or 6, wherein the inner volume of said injector is larger than the inner volume of said trunk.

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