JP2005337967A - Dispensing machine - Google Patents

Dispensing machine Download PDF

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Publication number
JP2005337967A
JP2005337967A JP2004159275A JP2004159275A JP2005337967A JP 2005337967 A JP2005337967 A JP 2005337967A JP 2004159275 A JP2004159275 A JP 2004159275A JP 2004159275 A JP2004159275 A JP 2004159275A JP 2005337967 A JP2005337967 A JP 2005337967A
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feed screw
gear nut
dispenser
coating layer
dlc
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JP2004159275A
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Japanese (ja)
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Seiho O
性宝 応
Yuji Udagawa
雄司 宇田川
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Juki Corp
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Juki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a dispensing machine capable of reducing friction in a sliding part between a feed screw and a gear nut, and capable of enhancing remarkably durability. <P>SOLUTION: This dispensing machine 10 has the feed screw 14 movable vertically together with a piston 12 for sucking and discharging a liquid sample, and the gear nut 16 screwed with the feed screw 14 and capable of driving vertical-directionally the feed screw 14. A coating layer due to DLC is formed on a surface of the feed screw 14, and the gear nut 16 comprises a nonferrous metal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、試薬、検体等の液状試料の分注に用いられる分注機に関する。   The present invention relates to a dispenser used for dispensing liquid samples such as reagents and specimens.

従来、液状試料の吸排を行うためのピストンと共に上下動可能な送りねじと、該送りねじに螺合され、前記送りねじを上下方向に駆動可能なギアナットと、を有してなる分注機が広く知られている（例えば、特許文献１参照）。   2. Description of the Related Art Conventionally, a dispensing machine has a feed screw that can move up and down together with a piston for sucking and discharging a liquid sample, and a gear nut that is screwed to the feed screw and can drive the feed screw in the vertical direction. It is widely known (for example, see Patent Document 1).

特開平１１−２７１１３０号公報JP 11-271130 A

このような分注機は主として医療分野や液分析分野等で多用されるため、部品の材料としては防錆性の高いステンレスやアルミ等が用いられると共に、部品に塗布されるグリースは検体や試薬などへの混入を回避するために最小限にする必要がある。そのため、送りねじとギアナットの摺動部において摩耗が発生しやすく、摩耗粉によって送りねじとギアナットの滑りが悪化し、場合によっては液状試料を吸排することができなくなってしまうといった問題点があった。   Since such dispensers are frequently used mainly in the medical field and the liquid analysis field, etc., stainless steel, aluminum, etc. with high rust prevention properties are used as the material of the parts, and grease applied to the parts is used for specimens and reagents. It is necessary to minimize it to avoid contamination. For this reason, wear is likely to occur at the sliding portion of the feed screw and the gear nut, and the slip of the feed screw and the gear nut deteriorates due to wear powder, and in some cases, it becomes impossible to suck and discharge the liquid sample. .

本発明はこのような問題点を解決するためになされたものであって、送りねじとギアナットの摺動部における摩耗を低減し、耐久性を大幅に向上させることができる分注機を提供することを目的とする。   The present invention has been made to solve such problems, and provides a dispenser capable of reducing wear at a sliding portion of a feed screw and a gear nut and greatly improving durability. For the purpose.

本発明は、液状試料の吸排を行うためのピストンと共に上下動可能な送りねじと、該送りねじに螺合され、前記送りねじを上下方向に駆動可能なギアナットと、を有してなる分注機において、前記送りねじの表面にはＤＬＣ及びＭｅ−ＤＬＣのいずれか一方によるコーティング層が形成され、且つ、前記ギアナットは非鉄系金属からなる分注機によって、上記課題を解決したものである。   The present invention includes a feed screw that can move up and down together with a piston for sucking and discharging a liquid sample, and a gear nut that is screwed to the feed screw and can drive the feed screw in the vertical direction. In the machine, a coating layer of either DLC or Me-DLC is formed on the surface of the feed screw, and the gear nut is solved by a dispenser made of a non-ferrous metal.

なお、前記送りねじの表面と前記コーティング層との間には、Ｃｒ、ＳｉＣ、Ｓｉ、Ｗのいずれか１つからなる中間層が介在されていてもよい。   An intermediate layer made of any one of Cr, SiC, Si, and W may be interposed between the surface of the feed screw and the coating layer.

又、前記送りねじは鉄系金属からなるものであってもよく、又、前記送りねじには熱処理が施されていなくてもよい。   Further, the feed screw may be made of an iron-based metal, and the feed screw may not be subjected to heat treatment.

更に、前記送りねじと前記ギアナットの摺動部にはグリースが塗布されていてもよい。   Furthermore, grease may be applied to sliding portions of the feed screw and the gear nut.

本発明に係る分注機によれば、送りねじとギアナットの摺動部における摩耗を低減し、耐久性を大幅に向上させることができるという優れた効果を有する。   The dispenser according to the present invention has an excellent effect that the wear at the sliding portion of the feed screw and the gear nut can be reduced and the durability can be greatly improved.

以下、図面を用いて、本発明の実施形態に係る分注機について詳細に説明する。   Hereinafter, a dispenser according to an embodiment of the present invention will be described in detail with reference to the drawings.

図１及び図２に示されるように、本発明の実施形態に係る分注機１０は、液状試料の吸排を行うためのピストン１２と共に上下動可能な送りねじ１４と、この送りねじ１４に螺合され、送りねじ１４を上下方向に駆動可能なギアナット１６と、を有して構成されている。   As shown in FIGS. 1 and 2, a dispenser 10 according to an embodiment of the present invention includes a feed screw 14 that can move up and down together with a piston 12 for sucking and discharging a liquid sample, and a screw that is screwed onto the feed screw 14. And a gear nut 16 that can drive the feed screw 14 in the vertical direction.

ピストン１２は上下方向に配置された略丸棒状体からなり、略筒状体のシリンジ１８内に上下動自在に収容されている。なお、シリンジ１８の下端には、ピペットノズル２０Ａ及びその下端に着脱自在に装着されたチップ２０Ｂからなるノズル２０が取付けられている。又、ピストン１２の上端には送りねじ１４が同軸的に取付けられている。   Piston 12 consists of a substantially round bar-like object arranged in the up-and-down direction, and is accommodated in syringe 18 of a substantially cylindrical object so that it can move up and down. Note that a nozzle 20 including a pipette nozzle 20A and a tip 20B that is detachably attached to the lower end of the syringe 18 is attached to the lower end of the syringe 18. A feed screw 14 is coaxially attached to the upper end of the piston 12.

この送りねじ１４の下端近傍には、回転止め２２がセットスクリュー等で固定されており、この回転止め２２に係合するガイド２４により、ピストン１２及び送りねじ１４は上下方向に案内されると共に軸廻りの回転が規制されている。   In the vicinity of the lower end of the feed screw 14, a rotation stopper 22 is fixed with a set screw or the like. The piston 12 and the feed screw 14 are guided in the vertical direction by a guide 24 engaged with the rotation stopper 22, and the shaft Rotation around is restricted.

又、送りねじ１４の上端近傍には、内側に雌ねじ１６Ａが形成されたギアナット１６が螺合されている。このギアナット１６には歯車２６が噛合い係合しており、歯車２６は駆動モータ２８の出力軸に取付けられている。なお、ギアナット１６は軸受３０により回転自在に支持されると共にスラスト方向の動きが規制されている。   A gear nut 16 having a female screw 16A formed inside is screwed into the vicinity of the upper end of the feed screw 14. A gear 26 meshes with the gear nut 16, and the gear 26 is attached to the output shaft of the drive motor 28. The gear nut 16 is rotatably supported by the bearing 30 and the movement in the thrust direction is restricted.

送りねじ１４は、この例ではオーステナイト系のステンレス鋼（ＳＵＳ３０３）からなり、図３に拡大して示されるように、その表面には、ＳｉＣからなる中間層１４Ａを介して、ＤＬＣ（ダイヤモンド・ライク・カーボン）によるコーティング層１４Ｂが形成されている。なお、中間層１４Ａの厚さは０．１μｍ〜５μｍであることが好ましく、又、ＤＬＣによるコーティング層１４Ｂの厚さは０．１μｍ〜１０μｍ、硬さは１２００ＨＶ〜３５００ＨＶ、摩擦係数は０．３以下であることが好ましい。又、送りねじ１４は、浸炭焼入れ、焼入れ、窒化処理、イオンプレーティング処理等の高温の熱処理が施されずに加工されている。   In this example, the feed screw 14 is made of austenitic stainless steel (SUS303). As shown in an enlarged view in FIG. 3, the surface of the feed screw 14 is DLC (diamond-like) via an intermediate layer 14A made of SiC. A coating layer 14B made of carbon is formed. The thickness of the intermediate layer 14A is preferably 0.1 μm to 5 μm, the thickness of the coating layer 14B by DLC is 0.1 μm to 10 μm, the hardness is 1200 HV to 3500 HV, and the friction coefficient is 0.3. The following is preferable. The feed screw 14 is processed without being subjected to high-temperature heat treatment such as carburizing and quenching, quenching, nitriding treatment, or ion plating treatment.

一方、ギアナット１６は、この例ではりん青銅（Ｃ５１９１ＢＨ）からなり、このギアナット１６と送りねじ１４の摺動部にはグリース３２が塗布されている。   On the other hand, the gear nut 16 is made of phosphor bronze (C5191BH) in this example, and grease 32 is applied to the sliding portion between the gear nut 16 and the feed screw 14.

次に、本実施形態に係る分注機１０の作用について説明する。   Next, the operation of the dispenser 10 according to this embodiment will be described.

駆動モータ２８に通電すると、歯車２６を介してギアナット１６が回転駆動される。そして、このギアナット１６の回転によって送りねじ１４が上下方向に駆動され、ピストン１２がシリンジ１８内を上下方向に移動する。   When the drive motor 28 is energized, the gear nut 16 is rotationally driven via the gear 26. The rotation of the gear nut 16 drives the feed screw 14 in the vertical direction, and the piston 12 moves in the vertical direction in the syringe 18.

液状試料を吸引する時は、ピストン１２を上昇させることによってノズル２０に負圧を供給する。この状態で、ノズル２０を下降させて液状試料に挿入すると、ノズル２０のチップ２０Ｂ内に液状試料が吸引される。一方、液状試料を吐出する時は、ピストン１２を下降させることによってノズル２０に正圧を供給し、チップ２０Ｂから液状試料を吐出させる。   When the liquid sample is sucked, a negative pressure is supplied to the nozzle 20 by raising the piston 12. In this state, when the nozzle 20 is lowered and inserted into the liquid sample, the liquid sample is sucked into the tip 20 </ b> B of the nozzle 20. On the other hand, when discharging a liquid sample, a positive pressure is supplied to the nozzle 20 by lowering the piston 12, and the liquid sample is discharged from the chip 20B.

なお、本発明の発明者は、実験により、送りねじ１４及びギアナット１６の材料と、送りねじ１４の往復回数（寿命）との関係について複数のデータを採取した。なお、本実験においては、送りねじ１４を一定速度６．３ｍｍ／秒で往復運動させ、摺動部の摩耗によって送りねじ１４の速度が４．７ｍｍ／秒以下となるまでの往復回数をカウントした。又、本実施形態に係る分注機１０の比較例として、ステンレス鋼（ＳＵＳ３０３）にＮｉＰ無電解めっきを施した送りねじと、りん青銅（Ｃ５１９１ＢＨ）、ポリアミドイミド（ＴＯＲＬＯＮ）、高力黄銅（ＨＢ７１）及びアルミ（Ａ７０７５）からなるギアナットと、を組み合わせた分注機を用いた。   The inventor of the present invention collected a plurality of data on the relationship between the material of the feed screw 14 and the gear nut 16 and the number of reciprocations (life) of the feed screw 14 through experiments. In this experiment, the feed screw 14 was reciprocated at a constant speed of 6.3 mm / second, and the number of reciprocations until the speed of the feed screw 14 became 4.7 mm / second or less due to wear of the sliding portion was counted. . In addition, as a comparative example of the dispenser 10 according to the present embodiment, a feed screw obtained by performing NiP electroless plating on stainless steel (SUS303), phosphor bronze (C5191BH), polyamideimide (TORLON), high-strength brass (HB71) ) And a gear nut made of aluminum (A7075) were used.

その結果、図４に示されるように、ＮｉＰ無電解めっきを施した送りねじに、りん青銅からなるギアナットを組み合わせた場合（図４（Ａ））、ポリアミドイミドからなるギアナットを組み合わせた場合（図４（Ｂ））、高力黄銅からなるギアナットを組み合わせた場合（図４（Ｃ））、アルミからなるギアナットを組み合わせた場合（図４（Ｄ））に比べ、本実施形態に係る分注機１０（図４（Ｅ））は、寿命が長く、耐久性が大幅に向上されていることが確認された。   As a result, as shown in FIG. 4, when a gear nut made of phosphor bronze is combined with a feed screw subjected to NiP electroless plating (FIG. 4A), a gear nut made of polyamideimide is combined (FIG. 4). 4 (B)), when a gear nut made of high-strength brass is combined (FIG. 4C), and when a gear nut made of aluminum is combined (FIG. 4D), the dispenser according to this embodiment 10 (FIG. 4E) was confirmed to have a long life and greatly improved durability.

本実施形態に係る分注機１０によれば、送りねじ１４の表面にはＤＬＣによるコーティング層１４Ｂが形成され、且つ、ギアナット１６は非鉄系金属からなるため、送りねじ１４とギアナット１６の摺動部における摩耗を低減し、耐久性を大幅に向上させることができる。   According to the dispenser 10 according to the present embodiment, since the coating layer 14B made of DLC is formed on the surface of the feed screw 14 and the gear nut 16 is made of a non-ferrous metal, the slide between the feed screw 14 and the gear nut 16 is performed. The wear at the part can be reduced, and the durability can be greatly improved.

又、送りねじ１４の表面とコーティング層１４Ｂとの間には、ＳｉＣからなる中間層１４Ａが介在されているため、コーティング層１４Ｂを送りねじ１４に対して、より強固に密着させることができる。   Further, since the intermediate layer 14A made of SiC is interposed between the surface of the feed screw 14 and the coating layer 14B, the coating layer 14B can be more firmly adhered to the feed screw 14.

更に、送りねじ１４はステンレス（鉄系金属）からなるため、錆の発生を未然に防止することができる。   Furthermore, since the feed screw 14 is made of stainless steel (iron-based metal), the generation of rust can be prevented in advance.

又、送りねじ１４には熱処理が施されていないため、加工後の変形を少なくすることができる。   Further, since the feed screw 14 is not heat-treated, deformation after processing can be reduced.

更に、送りねじ１４とギアナット１６の摺動部にはグリース３２が塗布されているため、摺動部における摩耗をより一層低減することができる上に、耐熱性を向上させることができる。   Furthermore, since the grease 32 is applied to the sliding portion of the feed screw 14 and the gear nut 16, wear at the sliding portion can be further reduced and heat resistance can be improved.

なお、本発明に係る分注機は、上記実施形態に係る分注機１０の構造や形状等に限定されるものではない。   In addition, the dispenser which concerns on this invention is not limited to the structure of the dispenser 10 which concerns on the said embodiment, a shape, etc.

従って、例えば、送りねじ１４の表面にＤＬＣによるコーティング層１４Ｂを形成したが、本発明はこれに限定されず、Ｍｅ−ＤＬＣ（金属含有ダイヤモンド・ライク・カーボン）によるコーティング層を形成してもよい。なお、この場合、Ｍｅ−ＤＬＣによるコーティング層の厚さは０．１μｍ〜１０μｍ、硬さは１０００ＨＶ〜１５００ＨＶ、摩擦係数は０．３以下であることが好ましい。   Therefore, for example, the coating layer 14B made of DLC is formed on the surface of the feed screw 14, but the present invention is not limited to this, and a coating layer made of Me-DLC (metal-containing diamond-like carbon) may be formed. . In this case, it is preferable that the thickness of the coating layer by Me-DLC is 0.1 μm to 10 μm, the hardness is 1000 HV to 1500 HV, and the friction coefficient is 0.3 or less.

又、送りねじ１４の表面とコーティング層１４Ｂとの間には、ＳｉＣからなる中間層１４Ａを介在させたが、本発明はこれに限定されず、Ｃｒ、Ｓｉ、Ｗのいずれか１つからなる中間層を介在させてもよく、又、中間層を介在させることなく、送りねじ１４の表面に直接コーティング層１４Ｂを形成してもよい。   Further, an intermediate layer 14A made of SiC is interposed between the surface of the feed screw 14 and the coating layer 14B, but the present invention is not limited to this, and is made of any one of Cr, Si, and W. An intermediate layer may be interposed, or the coating layer 14B may be formed directly on the surface of the feed screw 14 without an intermediate layer.

更に、送りねじ１４の材料としてステンレス（ＳＵＳ３０３）を適用したが、他の鉄系金属やセラミック等を適用してもよく、又、ギアナット１６の材料としてりん青銅（Ｃ５１９１ＢＨ）を適用したが、他の非鉄系金属を適用してもよい。   Furthermore, although stainless steel (SUS303) is applied as the material of the feed screw 14, other ferrous metals or ceramics may be applied, and phosphor bronze (C5191BH) is applied as the material of the gear nut 16. The non-ferrous metal may be applied.

なお、送りねじ１４とギアナット１６の摺動部にグリース３２を塗布したが、十分な耐久性が得られる場合等には、グリースを塗布しなくてもよい。   Note that the grease 32 is applied to the sliding portion of the feed screw 14 and the gear nut 16, but the grease may not be applied if sufficient durability is obtained.

本発明の実施形態に係る分注機の略示側断面図Schematic side sectional view of a dispenser according to an embodiment of the present invention 同分注機における送りねじ及びギアナット近傍の略示部分拡大図Schematic enlarged view of the vicinity of the feed screw and gear nut in the same dispensing machine 同送りねじ及びギアナットの略示部分拡大図Schematic enlarged view of the feed screw and gear nut 同送りねじ及びギアナットの材料と、その寿命との関係を示したグラフGraph showing the relationship between the material of the lead screw and gear nut and their service life

符号の説明Explanation of symbols

１０…分注機
１２…ピストン
１４…送りねじ
１４Ａ…中間層
１４Ｂ…コーティング層
１６…ギアナット
１６Ａ…雌ねじ
１８…シリンジ
２０…ノズル
２０Ａ…ピペットノズル
２０Ｂ…チップ
２２…回転止め
２４…ガイド
２６…歯車
２８…駆動モータ
３０…軸受
３２…グリース DESCRIPTION OF SYMBOLS 10 ... Dispenser 12 ... Piston 14 ... Feed screw 14A ... Intermediate layer 14B ... Coating layer 16 ... Gear nut 16A ... Female screw 18 ... Syringe 20 ... Nozzle 20A ... Pipette nozzle 20B ... Tip 22 ... Anti-rotation 24 ... Guide 26 ... Gear 28 ... Drive motor 30 ... Bearing 32 ... Grease

Claims (5)

液状試料の吸排を行うためのピストンと共に上下動可能な送りねじと、該送りねじに螺合され、前記送りねじを上下方向に駆動可能なギアナットと、を有してなる分注機において、前記送りねじの表面にはＤＬＣ及びＭｅ−ＤＬＣのいずれか一方によるコーティング層が形成され、且つ、前記ギアナットは非鉄系金属からなることを特徴とする分注機。   In a dispensing machine comprising: a feed screw that can move up and down together with a piston for sucking and discharging a liquid sample; and a gear nut that is screwed to the feed screw and can drive the feed screw in the vertical direction. A dispenser characterized in that a coating layer of either DLC or Me-DLC is formed on the surface of the feed screw, and the gear nut is made of a non-ferrous metal. 請求項１において、
前記送りねじの表面と前記コーティング層との間には、Ｃｒ、ＳｉＣ、Ｓｉ、Ｗのいずれか１つからなる中間層が介在されていることを特徴とする分注機。 In claim 1,
An intermediate layer made of any one of Cr, SiC, Si, and W is interposed between the surface of the feed screw and the coating layer. 請求項１又は２において、
前記送りねじは鉄系金属からなることを特徴とする分注機。 In claim 1 or 2,
The dispenser is characterized in that the feed screw is made of an iron-based metal. 請求項３において、
前記送りねじには熱処理が施されていないことを特徴とする分注機。 In claim 3,
A dispenser characterized in that the feed screw is not heat-treated. 請求項１乃至４のいずれかにおいて、
前記送りねじと前記ギアナットの摺動部にはグリースが塗布されていることを特徴とする分注機。 In any one of Claims 1 thru | or 4,
A dispenser characterized in that grease is applied to sliding portions of the feed screw and the gear nut.
JP2004159275A 2004-05-28 2004-05-28 Dispensing machine Pending JP2005337967A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
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JP2006177522A (en) * 2004-12-24 2006-07-06 Kayaba Ind Co Ltd Flighted screw mechanism
JP2007247534A (en) * 2006-03-16 2007-09-27 Nissan Motor Co Ltd Variable compression ratio mechanism of internal combustion engine
JP2010089082A (en) * 2008-09-12 2010-04-22 Eppendorf Ag Pipette device
KR101235732B1 (en) 2011-04-12 2013-02-21 삼성탈레스 주식회사 Ball Screw
CN104101684A (en) * 2014-07-25 2014-10-15 合肥安鼎生物科技有限公司 Servo type burette
CN104155466A (en) * 2014-09-01 2014-11-19 江苏雷奥生物科技有限公司 Vertical movement mechanism for medical equipment
CN107735180A (en) * 2015-03-19 2018-02-23 贝克曼考尔特公司 Distributor for analyzer
US10758899B2 (en) 2017-05-05 2020-09-01 Eppendorf Ag Electronic dosing drive

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006177522A (en) * 2004-12-24 2006-07-06 Kayaba Ind Co Ltd Flighted screw mechanism
JP2007247534A (en) * 2006-03-16 2007-09-27 Nissan Motor Co Ltd Variable compression ratio mechanism of internal combustion engine
JP4714609B2 (en) * 2006-03-16 2011-06-29 日産自動車株式会社 Variable compression ratio mechanism of internal combustion engine
JP2010089082A (en) * 2008-09-12 2010-04-22 Eppendorf Ag Pipette device
KR101235732B1 (en) 2011-04-12 2013-02-21 삼성탈레스 주식회사 Ball Screw
CN104101684A (en) * 2014-07-25 2014-10-15 合肥安鼎生物科技有限公司 Servo type burette
CN104101684B (en) * 2014-07-25 2015-11-18 合肥安鼎生物科技有限公司 A kind of servo-type buret
CN104155466A (en) * 2014-09-01 2014-11-19 江苏雷奥生物科技有限公司 Vertical movement mechanism for medical equipment
CN107735180A (en) * 2015-03-19 2018-02-23 贝克曼考尔特公司 Distributor for analyzer
US10562021B2 (en) 2015-03-19 2020-02-18 Beckman Coulter, Inc. Dispenser for an analyzer
US10758899B2 (en) 2017-05-05 2020-09-01 Eppendorf Ag Electronic dosing drive

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