JP2018158293A - Pipette for powder, pipette device for powder and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipette for powder which accurately distributes a predetermined amount of powder.SOLUTION: A pipette 100 for powder includes: a chip 10 which has a filter 11 inside and has a predetermined volume V between the filter and a tip 12; a nozzle 20 detachably holding the chip; a vibrator 30 which applies vibration to the nozzle; and a suction and discharge mechanism 40 which applies a negative pressure or a positive pressure to the nozzle, where when the suction and discharge mechanism 40 applies the negative pressure to the tip 12 of the chip 10 held by the nozzle 20 and sucks powder from the tip 12, the vibrator 30 applies vibration to the chip 10 through the nozzle 20, and makes a bulk density of the powder with the predetermined volume V constant.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a powder pipette and a powder pipette device for holding a powder pipette.

  2. Description of the Related Art Conventionally, a technique related to a pipette for dispensing small amounts of powder as a sample is known. For example, Patent Document 1 discloses a disposable pipette device for powder dispensing that quantitatively dispenses a minute amount of powder. The disposable pipette device for powder dispensing includes a powder dispensing tip having a filter having pores capable of almost completely holding the powder to be dispensed into the tip of the spoid tip, and the tip is detachable. A nozzle having a tip to be held, a suction unit that can be connected to the nozzle, a pressurizing unit that can be connected to the nozzle, and a unit that switches between the two units are provided.

  Further, Patent Document 2 discloses a method for quantifying the amount of powder supplied so as not to generate bridges or cavities in the powder supplied into the die and to enable stable quantitative supply. In this method of quantifying the amount of powder supplied, after supplying powder to the die, the powder that has grown up is crushed with the upper punch to crush bridges and cavities, the lower punch is suddenly pulled down, Vibrate and shock the powder, crushing bridges and cavities, leaving the correct amount of powder in the mortar. When the powder in the mortar is quantified, the quality of the weight and density of the compression molded product is made constant, the number of defective products is reduced, and the yield is improved.

Japanese Patent Laid-Open No. 10-263421 JP 2000-301391 A

By the way, in the powder particles which are each one of the powders, the shape, the distribution of the diameter and the diameter (dispersion), the friction coefficient (smoothness of the surface), the fluidity, and the electrostatic chargeability are various. There are many variations in the physical properties of powders in which such particles are grouped. When trying to measure a predetermined amount of powder from a powder container, it is not practical to measure at a true density (particle density), so it is usually measured at a bulk density. The bulk density is a value obtained by dividing the weight of the powder by filling the powder in a fixed volume container by a fixed method and including the voids between the particles. However, the bulk density varies depending on the degree of compression in the powder, such as “loose bulk density” when loosely packed into a predetermined volume and “curled bulk density” filled with vibration. It is a thing.
However, with conventional pipettes and the like, such powders are not weighed at a constant bulk density for each weighing, and the same weighing method is used even though the physical characteristics differ depending on the type of powder. Has been distributed. This makes it impossible to accurately weigh the powder.
Therefore, the present invention provides a powder pipette that accurately dispenses a predetermined amount of powder and a device equipped with the powder pipette. Furthermore, the present invention provides a powder pipette that accurately dispenses a predetermined amount of powder by measuring according to the type of powder, and a powder pipette device equipped with the powder pipette. To do.

In order to solve the above problems, a chip having a filter inside and having a predetermined volume between the filter and the tip, a nozzle for detachably holding the chip, a vibrator for vibrating the nozzle, and a nozzle A suction / discharge mechanism that applies a negative pressure or a positive pressure, and when the suction / discharge mechanism applies a negative pressure to the tip of the tip held by the nozzle and sucks the powder from the tip, the vibrator passes the tip through the nozzle. A powder pipette that provides vibration to the surface is provided.
According to this, a powder that accurately dispenses a predetermined amount of powder by applying vibration to the chip when sucking the powder from the tip of the chip and making the bulk density of the powder in a predetermined volume constant. Pipettes can be provided.

Furthermore, the vibrator may be characterized in that the frequency and / or amplitude of the vibration can be changed.
According to this, by making it possible to change the frequency and amplitude of vibration, vibration according to the physical characteristics of the powder can be given, and the powder can be dispensed accurately.

Furthermore, the suction / discharge mechanism may be characterized in that the flow rate can be changed.
According to this, by making it possible to change the flow rate of the air pump, it is possible to give a flow rate according to the physical characteristics of the powder, and to accurately distribute the powder.

Furthermore, the predetermined volume may be changeable.
According to this, by making it possible to change the predetermined volume between the filter and the tip, it is possible to accurately dispense a desired amount of powder as desired.

Furthermore, a switching valve for switching the air flow generated by the suction / discharge mechanism and a switching switch for switching the switching valve are further provided, and the pressure applied to the nozzle by the switching switch is switched from a negative pressure to a positive pressure of zero or more. When discharging the powder, it may be possible to select whether or not the vibrator vibrates the nozzle.
According to this, by making it possible to select whether or not to give vibration when discharging the powder, it is possible to perform discharge suitable for the container to which the powder is discharged.

In order to solve the above problem, the first container includes the powder pipette, a holding portion for holding the powder pipette with the tip end directed downward, and a support portion for supporting the holding portion. A powder pipette device is provided for inhaling a sample inside and discharging the inhaled sample to a second container.
According to this, a powder that accurately dispenses a predetermined amount of powder by applying vibration to the chip when sucking the powder from the tip of the chip and making the bulk density of the powder in a predetermined volume constant. A pipetting device can be provided.

In order to solve the above-mentioned problems, a method of sucking a sample powder into a predetermined volume of a pipette, and applying vibration to the tip of the pipette when sucking the powder, A method for making the density constant is provided.
According to this, a method of accurately dispensing a predetermined amount of powder by applying vibration to the chip when sucking powder from the tip of the chip and making the bulk density of the powder in a predetermined volume constant. Can be provided.

  According to the present invention, it is possible to provide a powder pipette that accurately dispenses a predetermined amount of powder and a powder pipette device equipped with the powder pipette. Furthermore, the present invention provides a powder pipette that accurately dispenses a predetermined amount of powder by measuring according to the type of powder, and a powder pipette device equipped with the powder pipette. can do.

1 is a cross-sectional view in the axial direction of a powder pipette according to a first embodiment of the present invention. Explanatory drawing explaining the case where powder is dispensed in the pipette for powders of the 1st Example which concerns on this invention. (A) Explanatory view in case of sucking powder, (B) Explanatory view in case of sucking powder, (C) Explanatory view in case of shaking off powder adsorbed on the tip by applying vibration. D) Explanatory drawing in the case of stopping the suction and applying vibration to transfer the powder to the cell. The schematic diagram including sectional drawing of the pipette for powders of the 2nd Example which concerns on this invention. Sectional drawing of the axial direction of the pipette for powder of the 3rd Example which concerns on this invention. The schematic diagram which shows the pipette apparatus for powder containing the pipette for powder of the 3rd Example which concerns on this invention.

Each example will be described below with reference to the drawings.
<First Example>
With reference to FIG. 1 and FIG. 2, the powder pipette 100 in a present Example is demonstrated. The powder pipette 100 has a filter 11 inside, a tip 10 having a predetermined volume V between the filter 11 and the tip 12, a nozzle 20 that detachably holds the tip 10, and vibrations to the nozzle 20. The vibrator 30 to be applied and the suction / discharge mechanism 40 to apply a negative pressure or a positive pressure to the nozzle 20 are provided. The chip 10 can be repeatedly used for the same kind of powder reagent or the like during a series of powder dispensing operations, but when the type of powder is changed, the chip 10 may be contaminated and is therefore disposable. Therefore, the chip 10 is detachably attached to the nozzle 20. Typically, the opening on the opposite side of the tip 12 of the chip 10 is attached so as to fit into one end 21 of the nozzle 20.

  The chip 10 has a filter 11 for filtering the powder P from the flowing gas. The filter 11 has pores and allows gas to pass therethrough, but is not particularly limited as long as the powder P is stiff, but static electricity is generated when the powder P is filtered, and the filtration performance is reduced by the static electricity. It is preferred to be made from a material with increased hydrophobicity. In the present specification, the powder P refers to a collection of fine particles, and includes not only so-called powder-like particles but also granular particles having a relatively larger particle diameter, and is synonymous with so-called powder particles. It is.

  The chip 10 has a predetermined volume V between the filter 11 and the tip 12. The chip 10 sucks the powder P together with air from the tip 12, and the powder P is scraped by the filter 11, so that the powder P has a predetermined volume V existing between the tip 12 inside the chip 10 and the filter 11. It is stored in the space which has. The filter 11 may be held and fixed on the inner wall of the chip 10 or may be movable between the tip 12 of the chip 10 and the opening on the nozzle 20 side. In the case where the filter 11 is movably provided, the filter 11 is preferably made of a material having elasticity that can apply pressure to the inner wall of the chip 10. Further, a mechanism for adjusting the position of the filter 11 in the chip 10 may be provided. In this way, by making the predetermined volume V between the filter 11 and the tip 12 changeable, a desired predetermined amount of powder can be dispensed as appropriate. Further, the chip 10 may be provided with a scale indicating the volume on the side surface to guide the position of the filter 11.

  The nozzle 20 is hermetically sealed at one end 21 and detachably holds the chip 10 and is held by the main body 90 so as to vibrate. The main body 90 is a so-called casing of the powder pipette 100, and is a part held by the user of the powder pipette 100, and includes a part of the vibrator 30, the suction / discharge mechanism 40, In addition, electrical and mechanical components (not shown) for making the powder pipette 100 function are incorporated. The nozzle 20 protrudes from the opening of the main body 90 on one end 21 side that holds the chip 10, and the rest is housed inside the main body 90. Since the nozzle 20 is provided so as to be able to vibrate independently with respect to the main body 90, there is a gap that can vibrate between the nozzle 20 and the opening of the main body 90 that fits the nozzle 20.

  The vibrator 30 is fixedly housed inside the main body 90 and vibrates the other end 22 (root side) of the nozzle 20. The vibrator 30 vibrates the tip 10 held at one end 21 of the nozzle 20 by vibrating the other end 22 of the nozzle 20. The vibration direction may be a direction perpendicular to the axial direction of the nozzle 20 or a direction parallel to the axial direction. The vibrator 30 is not particularly limited, but is typically a vibration motor. The vibrator 30 is preferably capable of changing the frequency and amplitude of vibration. According to this, vibration according to the physical characteristics of the powder can be given, and the powder can be dispensed accurately.

  The suction / discharge mechanism 40 is connected to the air tube 41 inside the main body 90 connected to the other end 22 of the nozzle 20 in an airtight manner, the air tube 41 exposed to the outside of the main body 90, and the air tube 41 connected thereto. And a source air pump (not shown) for applying a negative pressure or a positive pressure to the nozzle 20. The air tube 41 has a conduit through which air passes, and at least the air tube 41 exposed to the outside of the main body 90 preferably has flexibility to be easily moved because it dispenses the reagent. The air pump is preferably capable of changing the flow rate. According to this, the flow volume according to the physical characteristic of powder can be given, and powder can be dispensed correctly. In the present embodiment, the air pump is provided separately from the main body 90, but may be an air pump housed in the main body 90. The suction / discharge mechanism 40 preferably starts suction when the powder pipette 100 is turned on in order to avoid contamination.

  With reference to FIG. 2, a method for dispensing powder P using a powder pipette 100 will be described. This figure (A) shows the case where it is going to attract the powder P. FIG. First, the powder pipette 100 is turned on, the air pump is operated, and suction of air is started from the tip 12 of the tip 10 (the air flow is indicated by a dotted arrow). In this state, the powder pipette 100 is brought close to the powder P to be dispensed.

  This figure (B) shows the case where the powder P is attracted | sucked. When the powder pipette 100 is brought close to the powder P to be dispensed, the powder P is sucked from the tip 12 according to the flow of air. When the powder P is sucked into the tip 10 from the tip 12, it is rubbed into the filter 11 and collected in a space having a predetermined volume V between the filter 11 and the tip 12. However, since the air pump continues to be sucked, a part of the powder P is adsorbed to the chip 10 in a state of rising from the tip 12 due to the suction force of air from the tip 12. That is, at this stage, the powder P is in a state where a larger amount of powder to be weighed with the predetermined volume V is adsorbed to the chip 10 and the powder P is also attached to the outside of the chip 10.

  This figure (C) shows the case where the powder P which vibrates the chip | tip 10 and adsorb | sucked to the front-end | tip 12 is shaken off. When the vibrator 30 is operated in a state where the powder P is also attached to the outside of the chip 10, the powder P inside the chip 10 is vibrated. Then, the bulk density is achieved because the powder P is filled while applying vibration. At that time, the bulk of the powder P inside the chip 10 is reduced by vibration, but since the air is continuously sucked, the powder P adhering to the outside of the chip 10 is sucked into the chip 10 and has a predetermined amount. Allocated to volume V.

  Further, the powder P adhering to the outside of the chip 10 is screened out by vibration except for the powder P sucked into the chip 10. If the frequency and amplitude of vibration given by the vibrator 30 and the physical characteristics of the powder P to which the suction force of the suction / discharge mechanism 40 is given are appropriately applied, the powder P overflowing from the tip 12 to the outside The state where the powder P is separated from the tip 10 and is cut off at the edge of the tip 12 is formed, and the powder P having a predetermined volume V with a predetermined bulk density is measured. The main body 90 may be provided with a vibrator switch (not shown) for operating the vibrator 30.

  This figure (D) shows the case where the suction of the suction / discharge mechanism 40 is stopped, the vibration is applied, and the powder P is transferred to the cell C. In the space between the filter 11 and the tip 12 of the powder pipette 100, the powder P occupying a predetermined volume V with a predetermined bulk density has been weighed. The body P is discharged downward from the tip 12 by gravity. At this time, the vibrator 30 applies vibration to the chip 10, whereby the powder P adhering to the inner wall of the chip 10 and the surface of the filter 11 can be shaken off. In this way, by transferring the powder P to another container such as a reagent bottle or cell C, a predetermined amount of the powder P can be accurately dispensed.

  As described above, in the powder pipette 100 according to the present invention, when the suction / discharge mechanism 40 applies negative pressure to the tip 12 of the tip 10 held by the nozzle 20 and sucks the powder P from the tip 12, The vibrator 30 vibrates the chip 10 through the nozzle 20 to keep the bulk density of the powder P in a predetermined volume V constant. According to this, the pipette 100 for powder which dispenses a predetermined amount of powder correctly can be provided.

  The above also shows a method of sucking the sample powder P into the predetermined volume of the powder pipette 100. That is, this method is a method in which when the powder P is inhaled, the tip 12 of the powder pipette 100 is vibrated to make the bulk density of the powder in a predetermined volume V constant. According to this, a method for accurately dispensing a predetermined amount of powder can be provided.

  For each particle that constitutes the powder, its shape, diameter and degree of distribution (dispersion), friction coefficient indicating the smoothness of the surface of the particle, fluidity, and ease of electrostatic charge are various. There are many variations in the physical properties of the powder in which such particles are collected. For example, even if the powder has the same average particle diameter, the volume differs depending on whether the dispersion is large or small, even if the mass is the same. On the other hand, even if the container has the same volume, the powder is filled in a case where the container is loosely filled with a large amount of voids between particles and a state where the container is filled with a small amount of voids between particles. Mass is different.

  When filling a container to form a state where there are few voids between particles, an appropriate frequency (Hz), amplitude (M), and amount of vibration given to the powder depending on the physical characteristics of the powder ( N) is different. Further, when the powder is vibrated while sucking the powder as in the powder pipette 100 of the present embodiment, the bulk density is also affected by the force of pressing the powder (air flow rate or suction force). Therefore, the fact that the frequency and amplitude of the vibrator 30 and the flow rate and suction force of the suction / discharge mechanism 40 can be changed can provide vibration and suction force according to the physical characteristics of the powder. Can be dispensed accurately.

<Second Example>
With reference to FIG. 3, the powder pipette 100A in a present Example is demonstrated. In order to avoid repeated description, the same components are denoted by the same reference numerals, and different points from the above embodiment will be mainly described. The powder pipette 100A includes a tip 10, a nozzle 20, a vibrator 30, a suction / discharge mechanism 40A that applies a negative pressure or a positive pressure to the nozzle 20, and a switching that switches a flow direction of air generated by the suction / discharge mechanism 40A. A valve 50 and a changeover switch 60 for switching the changeover valve 50 are provided.

  The switching valve 50 includes a nozzle side opening P1 connected to the air tube 41A of the suction / discharge mechanism 40A, and an intake port side opening P2 connected to a pipe line to the intake port 52 of the air pump 51 of the suction / discharge mechanism 40A. The exhaust port side opening P3 connected to the pipe line from the exhaust port 53 of the air pump 51, and the atmospheric opening P4 opened to the atmosphere. The switching valve 50 has a valve body (not shown) inside. The valve body has a suction position for sucking into the switching valve 50 from the nozzle side opening P1 and an exhaust position for exhausting from the inside of the switching valve 50 to the outside of the nozzle side opening P1. Note that the air pump 51 always rotates in the same direction, and always sucks air from the intake port 52 and exhausts air from the exhaust port 53.

  When the valve body is in the suction position, the nozzle side opening P1 and the intake port side opening P2 are connected, and the exhaust port side opening P3 and the atmosphere opening P4 are connected. For this reason, the air is sucked from the tip 12 of the tip 10 as indicated by a dotted arrow, and passes through the nozzle 20, the air tube 41 </ b> A, the nozzle side opening P <b> 1, the passage inside the switching valve 50, and the inlet side opening P <b> 2. The air is exhausted from the air opening P4 to the atmosphere through the intake port 52, the exhaust port 53, the exhaust port side opening P3, and the passage inside the switching valve 50.

  When the valve body is at the exhaust position, the atmospheric opening P4 and the inlet side opening P2 are connected, and the exhaust port side opening P3 and the nozzle side opening P1 are connected. For this reason, the air is sucked from the atmospheric opening P4 as indicated by a one-dot chain line arrow, and passes through the passage inside the switching valve 50, and the intake side opening P2, the intake port 52, the exhaust port 53, and the exhaust port side opening. P3 is exhausted from the nozzle side opening P1, the air tube 41A, the nozzle 20, and the tip 12 of the tip 10 through the passage inside the switching valve 50. In this embodiment, the switching valve 50 is provided outside the main body 90, but may be housed inside the main body 90.

  The changeover switch 60 is electrically connected to the valve body and switches between the suction position and the exhaust position. Thus, with the switching valve 50, the air pump 51 is always rotating in the same direction, but at the tip 12 of the chip 10, negative pressure and positive pressure can be applied, and both suction and discharge are performed. Can do. Therefore, in the powder pipette 100A, when discharging the powder P to the cell C, instead of stopping the suction of the suction / discharge mechanism 40A, the changeover switch 60 is operated to switch from the suction position to the exhaust position. P may be discharged from the tip 12. Thus, by having not only the negative pressure and the zero pressure (atmospheric pressure) but also the positive pressure applied to the chip 10, the powder P remaining inside the chip 10 when the powder P is discharged is made almost zero. And a predetermined amount of the powder P can be accurately dispensed.

  In addition, when the pressure applied to the nozzle 20 and the tip 10 by the changeover switch 60 is switched from a negative pressure to a positive pressure of zero or more and the powder P is discharged from the tip 12, the vibrator 30 vibrates the nozzle 20. It may be possible to select whether or not. That is, for example, when the main body 90 has a vibrator switch (not shown) for turning the vibrator 30 on and off, and the changeover switch 60 is set to the exhaust position, whether or not vibration is applied to the chip 10 by the vibrator switch. You may make it selectable. According to this, discharge suitable for the container to discharge can be performed. In addition, by allowing the air to flow backward in the filter 11 in this way, it is possible to release the powder particles that have entered the pores inside the filter 11.

<Third embodiment>
With reference to FIG. 4 and FIG. 5, the powder pipette 100B provided with the powder pipette 100B and the powder pipette 100B in the present embodiment will be described. In order to avoid repeated description, the same components are denoted by the same reference numerals, and different points from the above embodiment will be mainly described. The powder pipette 100B includes a tip 10, a nozzle 20B, a vibrator 30, and a suction / discharge mechanism 40B that applies a negative pressure or a positive pressure to the nozzle 20B.

  The suction / discharge mechanism 40B has two systems, a negative pressure system and a positive pressure system. The nozzle 20 </ b> B and the air tube 41 </ b> B have two outer and inner pipe lines, and the outer pipe line is a negative pressure system (suction system) and the inner pipe line is a positive pressure system (discharge system). The outer pipe line is connected to an air pump 220a that always sucks, and the inner pipe line is connected to an air pump 220b that always discharges. The suction / discharge mechanism 40B includes a switching valve (not shown) in each system to circulate or stop air. In this way, by providing a dedicated negative / positive air pump, the air flow rate at the time of switching is stabilized.

  The powder pipette device 200 supports the powder pipette 100B, a holding portion 240 for holding the powder pipette 100B with the tip 12 of the tip 10 substantially downward such as vertically downward, and the holding portion 240. Connected to the supporting portion 230, the cell base 250 for placing the cell C below the powder pipette 100B, the power operation unit 210 connected to the powder pipette 100B, and the power operation unit 210. An air pump unit 220.

  The holding portion 240 holds the main body 90 of the powder pipette 100B, and sucks the powder in the cell C existing below and discharges the powder to another cell C. Hold in the direction. The holding unit 240 may hold the powder pipette 100B in a detachable manner. The support unit 230 is configured to support the holding unit 240 and to move the holding unit 240 in the vertical direction as indicated by a dotted arrow.

  The cell table 250 is a table for placing the cell C containing the powder to be sucked and dispensed or the cell C to which the sucked powder is to be distributed. The cell table 250 may be fixed when the cell C is replaced by a human hand, or the cell table 250 itself may be replaced when the cell C is automatically replaced without a human hand. The cell C may be moved to move below the powder pipette 100B, or moved to another location. Further, even if the cell base 250 is fixed, the powder that has entered the cell C is sucked by the movement of the support unit 230 and the holding unit 240, and the powder that has been sucked into another cell C after the movement. May be distributed.

  The power supply operation unit 210 is connected to the powder pipette 100 </ b> B via a connection line 218. The connection line 218 electrically connects the powder pipette 100B and the power supply operation unit 210, and has airtightness as a conduit for air that the powder pipette 100B sucks or discharges from the tip 10, and connects the two. To do. Specifically, the connection line 218 is connected to the air tube 41B on the powder pipette 100B side and to the suction / discharge connection adapter 217 on the power supply operation unit 210 side.

  The suction / discharge connection adapter 217 includes a suction pipe adapter 217a, a discharge pipe adapter 217b, and a power line adapter 217c. The suction pipe adapter 217a is connected to a pipe line outside the negative pressure system, and the discharge pipe adapter 217b is connected to a pipe line inside the positive pressure system. Further, the power line adapter 217 c supplies power for driving the vibrator 30. The suction pipe adapter 217a is connected to a suction system air pump 220a provided in the air pump unit 220, and the discharge pipe adapter 217b is connected to a discharge system air pump 220b similarly provided in the air pump unit 220.

  Further, the power supply operation unit 210 includes a suction flow rate adjustment dial 215, a discharge flow rate adjustment dial 216, and a pressurization zero switch 219, so that the flow rate of air sucked or discharged from the tip 10 by the powder pipette 100B can be changed. Composed. The suction flow rate adjustment dial 215 continuously changes the flow rate of the suction system air pump 220a. The discharge flow rate adjustment dial 216 continuously changes the flow rate of the discharge system air pump 220b. The pressurization zero switch 219 is a switch for suddenly setting the pressure to zero (atmospheric pressure) while applying a negative pressure or a positive pressure to the powder pipette 100B. The suction / discharge mechanism 40B of the present embodiment includes an air tube 41B inside the main body 90, a pipe through which air in the connection line 218 flows, a suction pipe adapter 217a, a discharge pipe adapter 217b, an air pump 220a, and an air pump 220b. The air pump unit 220 includes a suction flow rate adjustment dial 215, a discharge flow rate adjustment dial 216, and a pressurization zero switch 219.

The power operation unit 210 includes a vibration switch 212 and a vibration adjustment dial 213.
And a discharge vibration button 214. The vibration switch 212 turns on and off the vibrator 30 in the powder pipette 100B at the time of suction by user operation. The discharge vibration button 214 turns on and off the vibrator 30 at the time of discharge by a user operation. The vibration adjustment dial 213 is a dial for changing the frequency of vibration of the vibrator 30 by a user operation.

  The power operation unit 210 also includes a power switch 211. When the user turns on the power switch 211, the air pump unit 220 is energized to operate the air pump 220a and the air pump 220b. However, when the power switch 211 is turned on by a switching valve (not shown) provided in the power operation unit 210, the powder pipette 100B starts suction.

  The user operates the suction flow rate adjustment dial 215 and the vibration adjustment dial 213 according to the physical characteristics of the powder to be dispensed to adjust the flow rate of the air to be sucked and the vibration frequency of the vibrator 30. The user places the cell C, which is a container containing the powder, below the powder pipette 100B, moves the holding unit 240 downward, and sucks the powder from the chip 10. While maintaining the suction state, the user slightly raises the holding unit 240, operates the vibration switch 212 to drive the vibrator 30, and shakes off the adsorbed powder so as to rise to the tip 12 of the chip 10. .

  After the powder is shaken off and a predetermined amount of powder is stored in a predetermined volume V, the user raises the holding part 240 further upward and opens the cell C which is a container to which the stored powder is to be distributed. Place below the powder pipette 100B. When placed below, the user moves the holding unit 240 downward and operates the suction flow rate adjustment dial 215 or the pressurization zero switch 219 to make the suction flow rate zero. Then, the powder in the chip 10 falls into the cell C due to its own weight. When the powder fell into the cell C, it was discharged from the chip 10, and the powder could be dispensed from the container (first container) to another container (second container). As described above, when the powder is sucked from the tip 12 of the chip 10, the chip 10 is vibrated and the bulk density of the powder P in the predetermined volume V is made constant so that a predetermined amount of powder can be accurately separated. A powder pipetting device 200 can be provided.

  The user may discharge the powder by setting the suction flow rate to zero and operating the discharge flow rate adjustment dial 216 to make the discharge flow rate larger than zero. Further, when discharging, the user may operate the discharge vibration button 214 to drive the vibrator 30 to vibrate the chip 10. The user may discharge the powder from the chip 10 by operating the pressure zero switch 219 and the vibration switch 212. If discharged only by vibration, the powder will not blow up. Although the case where the user operates the powder pipette device 200 has been described, the powder pipette device can be operated without human intervention by automating a series of operations instead of the user. Powders such as samples can be dispensed from one container to another.

  In addition, this invention is not limited to the illustrated Example, The implementation by the structure of the range which does not deviate from the content described in each item of a claim is possible. That is, although the present invention has been particularly illustrated and described with respect to particular embodiments, it should be understood that the present invention has been described in terms of quantity, quantity, and amount without departing from the scope and spirit of the present invention. In other detailed configurations, various modifications can be made by those skilled in the art.

  For example, in the above embodiment, the vibration switch 212 and the pressure zero switch 219 are provided not in the powder pipette 100B but in the power supply operation unit 210. However, the powder pipette 100B is held in the user's hand and the powder is turned on. Are preferably provided in the powder pipette 100B.

DESCRIPTION OF SYMBOLS 100 Powder pipette 10 Tip 11 Filter 12 Tip 20 Nozzle 21 One end of nozzle 22 Other end of nozzle 30 Vibrator 40 Suction / discharge mechanism 41 Air tube 50 Switching valve 51 Air pump 52 Intake port 53 Exhaust port 60 Changeover switch 90 Main body 200 Powder Body pipette device 210 Power operation unit 211 Power switch 212 Vibration switch 213 Vibration adjustment dial 214 Discharge vibration button 215 Suction flow adjustment dial 216 Discharge flow adjustment dial 217 Suction discharge connection adapter 218 Connection line (air tube, electric wire)
219 Pressurization zero switch 220 Air pump unit 230 Support part 240 Holding part 250 Cell base P1 Nozzle side opening P2 Inlet opening side opening P3 Exhaust opening side opening P4 Atmospheric opening V Volume C Container (cell)
P powder

Claims (7)

A chip having a filter inside and having a predetermined volume between the filter and the tip;
A nozzle for detachably holding the chip;
A vibrator that vibrates the nozzle;
A suction / discharge mechanism for applying a negative pressure or a positive pressure to the nozzle;
With
When the suction / discharge mechanism applies negative pressure to the tip of the tip held by the nozzle and sucks powder from the tip, the vibrator applies vibration to the tip through the nozzle.
Pipette for powder.   The powder pipette according to claim 1, wherein the vibrator is capable of changing a frequency and / or an amplitude of vibration.   The powder pipette according to claim 1, wherein the suction / discharge mechanism is capable of changing a flow rate.   4. The powder pipette according to claim 1, wherein the predetermined volume is changeable. A switching valve for switching the flow of air generated by the suction / discharge mechanism, and a switching switch for switching the switching valve;
When the pressure applied to the nozzle by the changeover switch is switched from a negative pressure to a positive pressure of zero or more, and the powder is discharged from the tip, it can be selected whether or not the vibrator gives vibration to the nozzle. The powder pipette according to claim 1, wherein the pipette is for powder. A powder pipette according to any one of claims 1 to 5,
A holding portion for holding the powder pipette with the tip of the tip facing downward;
A support part for supporting the holding part,
Inhaling the sample in the first container and discharging the inhaled sample into the second container;
Pipette device for powder. A method for inhaling a sample powder into a predetermined volume of a pipette,
A method of applying a vibration to the tip of the pipette when inhaling powder to make the bulk density of the powder constant in the predetermined volume.