JP4262021B2 - Concrete mixer shaft seal equipment - Google Patents

Concrete mixer shaft seal equipment Download PDF

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JP4262021B2
JP4262021B2 JP2003273697A JP2003273697A JP4262021B2 JP 4262021 B2 JP4262021 B2 JP 4262021B2 JP 2003273697 A JP2003273697 A JP 2003273697A JP 2003273697 A JP2003273697 A JP 2003273697A JP 4262021 B2 JP4262021 B2 JP 4262021B2
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lip
compressed air
seal
pressure
seal member
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JP2005028854A (en
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輝己 藤木
敦資 山本
博樹 宮垣
義広 黒田
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Kitagawa Iron Works Co Ltd
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Kitagawa Iron Works Co Ltd
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  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Devices (AREA)
  • Accessories For Mixers (AREA)

Description

本発明は、混練槽内に混練羽根を有する回転軸を備え生コンクリートを混練するコンクリートミキサの軸封装置に関するものである。   The present invention relates to a shaft seal device for a concrete mixer that includes a rotating shaft having kneading blades in a kneading tank and kneads ready-mixed concrete.

生コンクリートの混練には、混練槽が回転する重力式や、固定された混練槽内に回転する混練羽根を備えた強制式などのミキサが使用されている。
これらのミキサの中には混練槽内に混練羽根を有する回転軸が挿入された構造のものがあり、混練槽内の回転軸部におけるシールについて種々の提案がなされている。
中でも、回転軸と混練槽の槽壁との軸封装置の構造では、軸封部に圧縮空気を供給して混練する材料の侵入を防止する構造が提案されている。
従来の回転軸の軸封装置の例では、回転軸の回転部と槽壁部の非回転部との間に間隙部を備え、該間隙部にランタンリングを設けランタンリングへ圧縮空気を供給することにより圧縮空気で間隙部に侵入した異物をミキサ内へ吹き飛ばし、異物の侵入を阻止する軸封装置が示されている（例えば、特許文献１参照）。
特開平８−２５３４１号公報 For the mixing of ready-mixed concrete, a mixer of a gravity type in which a kneading tank rotates or a forced type equipped with a kneading blade rotating in a fixed kneading tank is used.
Some of these mixers have a structure in which a rotating shaft having kneading blades is inserted into a kneading tank, and various proposals have been made for sealing at a rotating shaft portion in the kneading tank.
Among them, in the structure of the shaft seal device of the rotating shaft and the tank wall of the kneading tank, a structure has been proposed in which compressed air is supplied to the shaft seal portion to prevent entry of the material to be kneaded.
In an example of a conventional shaft seal device for a rotating shaft, a gap portion is provided between a rotating portion of the rotating shaft and a non-rotating portion of the tank wall portion, a lantern ring is provided in the gap portion, and compressed air is supplied to the lantern ring. Thus, a shaft seal device is shown in which foreign matter that has entered a gap portion with compressed air is blown into the mixer to prevent entry of foreign matter (see, for example, Patent Document 1).
JP-A-8-25341

しかしながら、前記の軸封装置では、回転部と非回転部との間に間隙部を有しているので異物の侵入が容易となり、間隙部を通じて簡単に異物が侵入する。
また、圧縮空気により異物を吹き飛ばして異物の侵入を阻止する際には、大量の圧縮空気が必要となり、圧縮空気の圧力の低下や混練作用による混練槽内の一時的な内圧の上昇には対応できず、間隙部内に異物の侵入をゆるしてしまう。
本発明は、前記の点を鑑み、コンクリートミキサの回転軸の軸封装置において間隙部から異物が軸封部分へ侵入するのを防ぎ且つ充分なシール性を確保することを目的とする。 However, since the shaft seal device has a gap between the rotating part and the non-rotating part, it is easy for foreign matter to enter, and the foreign substance easily enters through the gap.
In addition, a large amount of compressed air is required when blowing off foreign matter with compressed air to prevent the intrusion of foreign matter, and it can cope with a decrease in the pressure of compressed air or a temporary increase in internal pressure due to the kneading action. This is not possible, and the entry of foreign matter into the gap is eased.
In view of the above-described points, an object of the present invention is to prevent foreign matter from entering a shaft seal portion from a gap portion in a shaft seal device for a rotating shaft of a concrete mixer and to ensure sufficient sealing performance.

混練槽内に混練羽根を有する回転軸を備えるコンクリートミキサにおける回転軸の軸封装置において、前記回転軸に固着する回転部に設けられ回転軸に対し垂直なシール面を有するシール板と、前記シール面に接し弾性体で形成されるリップを設け、該リップの先端が回転軸芯に対し外方へ傾斜する形状であるリップを有する一次シール部材と、該一次シール部材よりも混練槽外方に設けられ回転部の円周面と接する二次シール部材と、前記一次シール部材と二次シール部材との間に設けられた圧縮空気室へ圧縮空気を供給し前記リップの全域へ常に圧縮空気の圧力を均一に加える圧縮空気供給手段を備えることを特徴とする。
In a shaft seal device for a rotating shaft in a concrete mixer having a rotating shaft having kneading blades in a kneading tank, a seal plate provided on a rotating portion fixed to the rotating shaft and having a seal surface perpendicular to the rotating shaft, and the seal A primary seal member having a lip formed in contact with the surface and formed of an elastic body, the tip of the lip being inclined outward with respect to the rotation axis; and more outward of the kneading tank than the primary seal member Compressed air is supplied to a secondary seal member provided in contact with the circumferential surface of the rotating portion, and a compressed air chamber provided between the primary seal member and the secondary seal member, so that the compressed air is always supplied to the entire area of the lip. Compressed air supply means for uniformly applying pressure is provided.

本発明によれば、コンクリートミキサの回転軸の軸封装置において、シール性を確保し、間隙部からの異物の侵入を確実に防ぐことができる。また、間隙部から漏れる圧縮空気の量を抑え、空気消費量を少なくすることができる。   ADVANTAGE OF THE INVENTION According to this invention, in the shaft seal apparatus of the rotating shaft of a concrete mixer, a sealing performance can be ensured and the penetration | invasion of the foreign material from a clearance gap can be prevented reliably. Further, the amount of compressed air leaking from the gap can be suppressed, and the amount of air consumption can be reduced.

以下に発明の実施例について図を用いて説明する。
図１は、本発明によるコンクリート用ミキサの回転軸の軸封装置における第一実施例の側断面図を示す。
また、図２は、一次シール部材のリップ部の詳細断面図を示す。
図１において、回転軸１にはカラー２が固定され、該カラー２には回転軸に対して垂直な平面のシール面２２を有するシール板３が固定されており、回転部としてカラー２とシール板３は回転軸１とともに回転する。回転しない混練槽の側壁５にはハウジング１３が固定されている。ハウジング１３とシール板３との間には隙間１.５mm程度の間隙部４が設けられている。 Embodiments of the invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view of a first embodiment of a shaft sealing device for a rotating shaft of a concrete mixer according to the present invention.
FIG. 2 is a detailed cross-sectional view of the lip portion of the primary seal member.
In FIG. 1, a collar 2 is fixed to a rotating shaft 1, and a seal plate 3 having a flat sealing surface 22 perpendicular to the rotating shaft is fixed to the collar 2. The plate 3 rotates with the rotating shaft 1. A housing 13 is fixed to the side wall 5 of the kneading tank that does not rotate. A gap 4 having a gap of about 1.5 mm is provided between the housing 13 and the seal plate 3.

ハウジング１３には、フィン形状のリップ８を有する一次シール部材７が内設され、該一次シール部材７のリップ８の先端がシール板３のシール面２２に接するように設けられている。
カラー２の外側には、二次シール部材６を形成するフローティングシールがカラーの円周面に接するように配設され、フローティングシールの外側には、フローティングシールを固定するシールケース１４がハウジング１３に固着されている。一次シール部材６であるフローティングシールはカラー２とグリスを用いて接しており、カラー２とフローティングシールとの間へグリスを供給するグリス配管１８がシールケース１４に設けられている。非回転部としてハウジング１３とシールケース１４と一次シール部材７と二次シール部材６が設けられている。
一次シール部材７と二次シール部材６との間にはカラー２とシールケース１４とハウジング１３及びシール板３とで形成される圧縮空気室１５が設けられ、間隔部４と連接し圧縮空気供給手段２１により圧縮空気が送られる。 A primary seal member 7 having a fin-shaped lip 8 is provided in the housing 13, and the tip of the lip 8 of the primary seal member 7 is provided so as to be in contact with the seal surface 22 of the seal plate 3.
A floating seal that forms the secondary seal member 6 is disposed outside the collar 2 so as to contact the circumferential surface of the collar. A seal case 14 that fixes the floating seal is disposed on the housing 13 outside the floating seal. It is fixed. The floating seal that is the primary seal member 6 is in contact with the collar 2 using grease, and a grease pipe 18 that supplies grease between the collar 2 and the floating seal is provided in the seal case 14. A housing 13, a seal case 14, a primary seal member 7, and a secondary seal member 6 are provided as non-rotating portions.
A compressed air chamber 15 formed by the collar 2, the seal case 14, the housing 13, and the seal plate 3 is provided between the primary seal member 7 and the secondary seal member 6. Compressed air is sent by means 21.

圧縮空気供給手段２１は、圧縮空気源１０であるコンプレッサと該コンプレッサからシールケース１４に接続する空気配管９を備え、コンプレッサから供給される圧縮空気がシールケース１４を介して圧縮空気室１５へ送られる。空気配管９の途中には、供給する圧縮空気の圧力を一定圧に調整する圧力調整弁１９と供給する圧縮空気に滴下給油するための給油手段１２を配設している。また、配管内の空気圧を検出する圧力検出器１１として圧力計が配設されている。前記圧力調整弁１９により圧縮空気室１５へ送られる圧縮空気の圧力は８０ｋＰａに調整される。
図２において、一次シール部材７に設けられたリップ８の先端は、回転軸芯に対して外方へ傾斜する形状になされ、リップ８の先端が図中上方となる傾斜を有し、リップ８の先端がシール板３に設けられたシール面２２と接触した状態でハウジング１３へ設けられている。 The compressed air supply means 21 includes a compressor as a compressed air source 10 and an air pipe 9 connected from the compressor to the seal case 14. The compressed air supplied from the compressor is sent to the compressed air chamber 15 through the seal case 14. It is done. In the middle of the air pipe 9, a pressure adjusting valve 19 for adjusting the pressure of the compressed air to be supplied to a constant pressure and an oil supply means 12 for dropping and supplying oil to the supplied compressed air are provided. In addition, a pressure gauge is provided as a pressure detector 11 that detects the air pressure in the pipe. The pressure of the compressed air sent to the compressed air chamber 15 by the pressure adjusting valve 19 is adjusted to 80 kPa.
In FIG. 2, the tip of the lip 8 provided on the primary seal member 7 has a shape that is inclined outward with respect to the rotational axis, and the tip of the lip 8 has an inclination that is upward in the figure. Is provided to the housing 13 in a state in which the tip of the is in contact with the seal surface 22 provided on the seal plate 3.

次に本発明の作用について説明する。
圧縮空気源１０より供給された圧縮空気は、空気配管９を介してシールケース１４に設けられた圧縮空気室１５へ送られる。
該圧縮空気室１５は、一次シール部材７と二次シール部材６との間に設けられており、圧縮空気は一次シール部材７と二次シール部材６の両方向へ流れるが、二次シール部材６はフローティングシールにより密閉されているため、圧縮空気は回転部のシール板３と非回転部のハウジング１３との間の間隙部４へ送られる。
間隙部４を通った圧縮空気は、ハウジング１３に設けられた一次シール部材７のリップ８へ圧縮空気室１５からエア圧力Ｒを加える。
リップ８へ加えられる圧縮空気は圧縮空気供給手段２１により常に均一の圧力で供給されるので、圧縮空気室１５からリップ８へ加えられる圧縮空気によるエア圧力Ｒはリップ８の全域に渡ってムラなく均一に作用する。 Next, the operation of the present invention will be described.
The compressed air supplied from the compressed air source 10 is sent to the compressed air chamber 15 provided in the seal case 14 via the air pipe 9.
The compressed air chamber 15 is provided between the primary seal member 7 and the secondary seal member 6, and the compressed air flows in both directions of the primary seal member 7 and the secondary seal member 6. Is sealed by a floating seal, the compressed air is sent to the gap 4 between the seal plate 3 of the rotating part and the housing 13 of the non-rotating part.
The compressed air passing through the gap 4 applies an air pressure R from the compressed air chamber 15 to the lip 8 of the primary seal member 7 provided in the housing 13.
Since the compressed air applied to the lip 8 is always supplied at a uniform pressure by the compressed air supply means 21, the air pressure R by the compressed air applied from the compressed air chamber 15 to the lip 8 is uniform over the entire area of the lip 8. Acts uniformly.

図２において、図２（ａ）は、混練槽（図中上方）からリップ８に混練物などの異物による外力Ｐが加わり、混練槽より異物が侵入しようとする場合を示す。
このとき、リップ８が外力Ｐに押されるとリップ８の先端部が図中下方へ向けて変形される。
下方へ押されたリップ８は、リップ厚さＴの中心線上のリップ８の根元部Ａを変形中心点として下方へ回転変形をおこす。
リップ８の先端は外方へ傾斜しているので、変形中心点Ａで回転変形すると垂直なシール面２２に対して回転半径方向で必要なリップ長さが短くなり余分なリップ長さ分がシール面へくい込まれる。このときリップ８の先端がシール面２２を押圧し、押圧力Ｑがリップ８の先端へ発生する。
この押圧力Ｑによりリップ８はシール面２２へ圧接され、軸封部への異物の侵入を阻止することができる。 2, FIG. 2 (a) shows a case where an external force P due to a foreign matter such as a kneaded product is applied to the lip 8 from the kneading tank (upper side in the figure), and the foreign matter tries to enter from the kneading tank.
At this time, when the lip 8 is pushed by the external force P, the tip of the lip 8 is deformed downward in the figure.
The lip 8 pushed downward is rotationally deformed downward with the root A of the lip 8 on the center line of the lip thickness T as a deformation center point.
Since the tip of the lip 8 is inclined outward, when the rotational center is deformed at the deformation center point A, the required lip length in the rotational radius direction becomes shorter with respect to the vertical seal surface 22 and the extra lip length is sealed. It is bitten into the surface. At this time, the tip of the lip 8 presses the seal surface 22, and a pressing force Q is generated at the tip of the lip 8.
By this pressing force Q, the lip 8 is pressed against the seal surface 22 and can prevent foreign matter from entering the shaft seal portion.

図２（ｂ）は、圧縮空気室１５（図中下方）から送られる圧縮空気のエア圧力Ｒがリップ８に加わる場合を示す。
この時、リップ８は下方からのエア圧力Ｒにより、図中上方へリップ８の先端を戻す作用力Ｓが働く。リップ８には圧縮空気のエア圧力Ｒが常に一定圧でリップ８の全周へ均一に加わるため、前記作用力Ｓはリップ８の全体に偏りなく均一に作用する。作用力Ｓはリップ８の先端を混練槽側（図中上方）へ動かし、そのリップ８の先端の動きによって侵入しようとする異物を混練槽（図中上方）へ押し戻す。
また、混練槽からの異物による外力Ｐにより図中下方へ向けて変形したリップ８は下方からのエア圧力Ｒにより図中上方へ向けて元の形状へ変形し、弾性体による形状復元性も加わり、リップ８の形状の復元作用が働く。これにより、混練槽からの外力Ｐによるリップ８の変形から生じるシール性の低減を防ぎ、リップ８でのシール性を長時間維持できる。 FIG. 2B shows a case where the air pressure R of compressed air sent from the compressed air chamber 15 (lower side in the figure) is applied to the lip 8.
At this time, the lip 8 is acted upon by an air pressure R from below to exert an acting force S that returns the tip of the lip 8 upward in the drawing. Since the air pressure R of the compressed air is constantly applied to the entire circumference of the lip 8 at a constant pressure, the acting force S acts uniformly on the entire lip 8 without being biased. The acting force S moves the tip of the lip 8 toward the kneading tank (upward in the figure), and pushes the foreign matter to be invaded by the movement of the tip of the lip 8 back into the kneading tank (upward in the figure).
Further, the lip 8 deformed downward in the figure by the external force P due to the foreign matter from the kneading tank is deformed to the original shape in the figure upward by the air pressure R from below, and the shape restoring property by the elastic body is also added. The restoring action of the shape of the lip 8 works. Thereby, reduction of the sealing performance resulting from the deformation of the lip 8 due to the external force P from the kneading tank can be prevented, and the sealing performance at the lip 8 can be maintained for a long time.

本発明は、非回転部である一次シール部材７のリップ８が回転部であるシール面２２と平面で接する構成になされているので、回転軸の曲面で軸封する際に生じる軸のブレによる軸封部分の隙間が発生することなく、リップ８は全周に渡り均一にシール面２２と接することができ、確実なシール性を保つことができる。
またリップ８へ圧力を与えるためにグリスではなく圧縮空気のエア圧力を用いるので、グリスを用いる際のグリスの不均一な注入やグリスの一部分の流出によるリップ８への圧力ムラが発生することなく、圧縮空気のエア圧力はリップ８全体に均一に加わるため、リップ８による均一なシール性が得られ、またリップ８に加わる圧力ムラによる異物の侵入がない。 In the present invention, since the lip 8 of the primary seal member 7 which is a non-rotating portion is in contact with the sealing surface 22 which is a rotating portion on a flat surface, the shaft is caused by shaft blurring which occurs when the shaft is sealed with the curved surface of the rotating shaft. The lip 8 can be uniformly in contact with the sealing surface 22 over the entire circumference without generating a gap in the shaft seal portion, and a reliable sealing performance can be maintained.
Further, since air pressure of compressed air is used instead of grease to apply pressure to the lip 8, pressure unevenness to the lip 8 due to non-uniform injection of grease or outflow of part of the grease does not occur. Since the air pressure of the compressed air is uniformly applied to the entire lip 8, uniform sealing performance by the lip 8 can be obtained, and foreign matter does not enter due to pressure unevenness applied to the lip 8.

また、一次シール部材７がシール面２２と接することで、間隔部４への異物の侵入を阻止しシール性を高め、さらに、間隔部４からの空気流出がなくなり、圧縮空気の使用量の低減が可能となる。
混練槽からの圧力が高くなると変形することでシール面２２へ押圧力を増すリップ８を供え、異物の侵入する圧力によってシール面２２への押圧力を生じさせ一次シール部材７のシール性を保持し、且つ前記リップ８の変形を圧縮空気室１５からの圧縮空気の圧力によって復元させ、元の形状を保つことでリップ８のシール性を維持する。また、前記圧縮空気の圧力とさらにはリップ８の弾性によるリップ形状の復元作用により、侵入した異物を混練槽へ押し戻す効果が得られる。 Further, since the primary seal member 7 is in contact with the seal surface 22, foreign matter can be prevented from entering the gap portion 4 to improve the sealing performance, and further, the outflow of air from the gap portion 4 can be eliminated and the amount of compressed air used can be reduced. Is possible.
When the pressure from the kneading tank is increased, the lip 8 increases the pressing force to the sealing surface 22 by being deformed, and the pressing force to the sealing surface 22 is generated by the intrusion pressure of the foreign matter to maintain the sealing performance of the primary seal member 7. Further, the deformation of the lip 8 is restored by the pressure of the compressed air from the compressed air chamber 15, and the original shape is maintained to maintain the sealing performance of the lip 8. In addition, the effect of pushing back the invading foreign matter to the kneading tank is obtained by the action of restoring the lip shape by the pressure of the compressed air and the elasticity of the lip 8.

リップ８の形状は図２の第一実施例で示すリップ８の先端形状に限定するものではなく、例えば図３に示すようにシール面２２に平行な先端形状としシール性をより向上することができる。
本発明の他の実施例として、図４にリップ部８の形状の異なる第二実施例を示す。
図４において、リップ８は、第一実施例で示すようなリップ８自体が傾斜を有する形状でなく、図中水平で傾斜を有しない形状をしており、リップ８の先端部に回転軸芯に対して外方へ傾斜を有する断面形状となす。
これにより、第一実施例と同様に図４（ａ）に示す混練槽（図中上方）からの外力Ｐに対しては、リップ８の先端部は変形中心点Ａを中心に下方へ回転変形し、シール面２２に圧接し、混練槽からの異物の侵入を防ぐ。
また、図４（ｂ）に示すように、圧縮空気室１５（図中下方）から送られる圧縮空気のエア圧力Ｒに対しては、リップ８の先端は変形中心点Ａを中心に上方へ回転変形され、リップ８の形状を戻し、リップ８の変形によるシール性の低減を防ぐ。 The shape of the lip 8 is not limited to the tip shape of the lip 8 shown in the first embodiment of FIG. 2, but for example, as shown in FIG. 3, the tip shape parallel to the seal surface 22 can be used to further improve the sealing performance. it can.
As another embodiment of the present invention, FIG. 4 shows a second embodiment in which the shape of the lip portion 8 is different.
In FIG. 4, the lip 8 is not a shape having an inclination as shown in the first embodiment, but has a shape that is horizontal and has no inclination in the drawing, and a rotational axis is provided at the tip of the lip 8. The cross-sectional shape is inclined outward.
As a result, as with the first embodiment, the tip of the lip 8 is rotationally deformed downward about the deformation center point A with respect to the external force P from the kneading tank shown in FIG. Then, it is pressed against the seal surface 22 to prevent foreign matter from entering from the kneading tank.
Further, as shown in FIG. 4B, the tip of the lip 8 rotates upward about the deformation center point A with respect to the air pressure R of the compressed air sent from the compressed air chamber 15 (lower side in the figure). The lip 8 is deformed and the shape of the lip 8 is restored to prevent a reduction in sealing performance due to the deformation of the lip 8.

本発明の第三実施例として、一次シール部材７がリップ８を複数供えた実施例を図５に示す。
本実施例の一次シール部材７はリップ８を連続して複数供えている。これにより、図中上方のリップ８ａと図中下方のリップ８ｂとシール面２２で密閉された気室１７が形成され、気室１７内の空気圧は一定に保たれる。
そのため、空気配管９からの空気もれ等のトラブルによる供給空気圧力の変動が発生しても、一次シール部材のシール性が損なわれることなく、常に確実なシール性を得ることができる。
As a third embodiment of the present invention, an embodiment in which the primary seal member 7 is provided with a plurality of lips 8 is shown in FIG.
The primary seal member 7 of this embodiment is provided with a plurality of lips 8 continuously. As a result, the air chamber 17 sealed by the upper lip 8a, the lower lip 8b in the drawing, and the sealing surface 22 is formed, and the air pressure in the air chamber 17 is kept constant.
Therefore, even if the supply air pressure fluctuates due to troubles such as air leakage from the air pipe 9, the sealing performance of the primary sealing member is not impaired, and a reliable sealing performance can always be obtained.

本発明の軸封部を示す側断面図。The sectional side view which shows the shaft seal part of this invention. リップ部の詳細断面図。Detailed sectional drawing of a lip | rip part. 他の実施例のリップ部の詳細断面図。The detailed sectional view of the lip part of other examples. 第二実施例のリップ部の詳細断面図。Detailed sectional drawing of the lip | rip part of 2nd Example. 第三実施例のリップ部の詳細断面図。Detailed sectional drawing of the lip | rip part of 3rd Example.

符号の説明Explanation of symbols

１ 回転軸
３ シール板
６ 二次シール部材
７ 一次シール部材
８ リップ部
１５ 圧縮空気室
DESCRIPTION OF SYMBOLS 1 Rotating shaft 3 Seal plate 6 Secondary seal member 7 Primary seal member 8 Lip part 15 Compressed air chamber

Claims (3)

混練槽内に混練羽根を有する回転軸を備えるコンクリートミキサにおける回転軸の軸封装置において、前記回転軸に固着する回転部に設けられ回転軸に対し垂直なシール面を有するシール板と、前記シール面に接し弾性体で形成されるリップを設け、該リップの先端が回転軸芯に対し外方へ傾斜する形状であるリップを有する一次シール部材と、該一次シール部材よりも混練槽外方に設けられ回転部の円周面と接する二次シール部材と、前記一次シール部材と二次シール部材との間に設けられた圧縮空気室へ圧縮空気を供給し前記リップの全域へ常に圧縮空気の圧力を均一に加える圧縮空気供給手段を備えることを特徴とするコンクリートミキサの軸封装置。 In a shaft seal device for a rotating shaft in a concrete mixer having a rotating shaft having kneading blades in a kneading tank, a seal plate provided on a rotating portion fixed to the rotating shaft and having a seal surface perpendicular to the rotating shaft, and the seal A primary seal member having a lip formed in contact with the surface and formed of an elastic body, the tip of the lip being inclined outward with respect to the rotation axis; and more outward of the kneading tank than the primary seal member Compressed air is supplied to a secondary seal member provided in contact with the circumferential surface of the rotating portion, and a compressed air chamber provided between the primary seal member and the secondary seal member, so that the compressed air is always supplied to the entire area of the lip. A shaft seal device for a concrete mixer, comprising compressed air supply means for uniformly applying pressure. 前記一次シール部材がリップを複数個設けることを特徴とする請求項１記載のコンクリートミキサの軸封装置。 2. The concrete mixer shaft seal device according to claim 1, wherein the primary seal member is provided with a plurality of lips. 前記圧縮空気供給手段が供給する圧縮空気の圧力を一定圧に調節する圧力調整弁と、空気配管内の圧縮空気の圧力を検出する圧力検出器を備えることを特徴とする請求項１乃至２記載のコンクリートミキサの軸封装置。 The pressure adjusting valve for adjusting the pressure of the compressed air supplied by the compressed air supply means to a constant pressure and the pressure detector for detecting the pressure of the compressed air in the air pipe are provided. Concrete mixer shaft seal device.
JP2003273697A 2003-07-11 2003-07-11 Concrete mixer shaft seal equipment Expired - Fee Related JP4262021B2 (en)

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