JPH0621728U - Filter by permeable membrane - Google Patents
Filter by permeable membraneInfo
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- JPH0621728U JPH0621728U JP6510092U JP6510092U JPH0621728U JP H0621728 U JPH0621728 U JP H0621728U JP 6510092 U JP6510092 U JP 6510092U JP 6510092 U JP6510092 U JP 6510092U JP H0621728 U JPH0621728 U JP H0621728U
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Abstract
(57)【要約】
【目的】 精密ろ過膜、限外ろ過膜等の透過膜によるろ
過操作に関する。
【構成】 精密ろ過膜もしくは限外ろ過膜などの透過膜
を使用したろ過装置において、複数の透過膜の後段に、
前段透過膜と同等もしくは前段透過膜より大きな膜孔径
を有する透過膜を、前段透過膜と同数もしくは前段透過
膜より少ない数本設け、又は前段透過膜より大きな膜孔
径を有しかつ前段透過膜とほぼ同一のろ過流量となる透
過面積をもつ透過膜を設け、前段透過膜のいずれか、又
は前段の透過膜の損傷時に、後段の透過膜の一次側の圧
力の急上昇もしくは後段の透過膜ろ過水量の急低下によ
り、前段の透過膜の損傷を検知するとともに、損傷した
前段の透過膜から漏出した不純物を、後段の透過膜で阻
止する。
(57) [Summary] [Purpose] The present invention relates to a filtration operation using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane. [Structure] In a filtration device that uses a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane, in the subsequent stage of a plurality of permeable membranes,
The same number of permeable membranes as the pre-stage permeable membrane or a membrane having a larger pore size than the pre-stage permeable membrane is provided, or several permeable membranes smaller than the pre-stage permeable membrane are provided. A permeation membrane with a permeation area that provides almost the same filtration flow rate is provided, and when one of the permeation membranes at the front stage or the permeation membrane at the front stage is damaged, the pressure on the primary side of the permeation membrane at the rear stage rises sharply or the permeate filtration water volume at the rear stage. The rapid decrease in the pressure causes the damage to the permeable membrane at the front stage to be detected, and the impurities leaked from the damaged permeable membrane at the front stage to be blocked by the permeable membrane at the rear stage.
Description
【０００１】[0001]
この考案は、精密ろ過膜、限外ろ過膜等の透過膜によるろ過操作に関するもの である。 This invention relates to a filtration operation using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane.
【０００２】[0002]
従来、精密ろ過膜、限外ろ過膜等の透過膜を利用して、ろ過操作が行なわれて きた。 透過膜は劣化もしくは損傷しても一般的にはその亀裂は小さく、亀裂部分から 漏出する粒子は、目視や連続的測定計器類では発見しにくいという欠点があり、 さらに万一透過膜に大きな損傷があつた場合には、即座に処理水に除去対象物質 が混入してしまうという欠点があつた。 Conventionally, filtration operation has been performed using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane. Even if the permeable membrane is deteriorated or damaged, its cracks are generally small, and particles leaking from the cracked part have the drawback that it is difficult to find them by visual inspection or continuous measuring instruments. If this happens, there is a drawback that the substance to be removed is immediately mixed into the treated water.
【０００３】[0003]
透過膜が損傷したときに漏出する不純物質は、損傷初期には極めて小量であり かつ粒径的にも小さいことが多い。 このため、従来の水処理で監視用に用いられてきた濁度計や電気伝導度計では 検知できないことが多い。 Impurities that leak out when the permeable membrane is damaged are often extremely small in the initial stage of damage and also small in particle size. For this reason, it is often not possible to detect with turbidity meters and electric conductivity meters that have been used for monitoring in conventional water treatment.
【０００４】[0004]
ここにおいて請求項１の考案においては、精密ろ過膜もしくは限外ろ過膜など の透過膜を使用したろ過装置において、複数の透過膜の後段に、前段透過膜と同 等もしくは前段透過膜より大きな膜孔径を有する透過膜を、前段透過膜と同数も しくは前段透過膜より少ない本数設け、前段透過膜のいずれかの損傷時に、後段 の透過膜の一次側の圧力の急上昇もしくは後段の透過膜ろ過水量の急低下により 、前段の透過膜の損傷を検知するとともに、損傷した前段の透過膜から漏出した 不純物を後段の透過膜で阻止することを特徴とする透過膜によるろ過装置を提案 し、かつ請求項２の考案においては、精密ろ過膜もしくは限外ろ過膜などの透過 膜を使用したろ過装置において、透過膜の後段に、前段透過膜と同等もしくは前 段透過膜より大きな膜孔径を有し、かつ前段透過膜とほぼ同一のろ過流量となる 透過面積をもつ透過膜を設け、前段の透過膜の損傷時に、後段の透過膜の一次側 の圧力の急上昇もしくは後段の透過膜ろ過水量の急低下により、前段の透過膜の 損傷を検知するとともに、損傷した前段の透過膜から漏出した不純物を、後段の 透過膜で阻止することを特徴とする透過膜によるろ過装置を提案するものである 。 Here, in the invention of claim 1, in a filtration device using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane, a membrane that is the same as the former permeable membrane or larger than the former permeable membrane after the plurality of permeable membranes. The number of permeable membranes with pore size is the same as or smaller than that of the former permeable membrane, and when one of the former permeable membranes is damaged, the pressure on the primary side of the latter permeable membrane increases sharply or the latter permeable membrane is filtered. Proposed a filtration device with a permeable membrane characterized by detecting damage to the permeable membrane at the preceding stage due to a sharp drop in water volume, and preventing impurities leaked from the damaged permeable membrane at the preceding stage by the permeable membrane at the subsequent stage, and According to the invention of claim 2, in a filtration device using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane, the latter stage of the permeable membrane is equal to or larger than the former stage permeable membrane. A permeable membrane with a large pore size and a permeation area that provides almost the same filtration flow rate as the former permeable membrane is provided, and when the former permeable membrane is damaged, the pressure on the primary side of the latter permeable membrane rises sharply or A filtration device with a permeable membrane characterized by detecting damage to the permeable membrane in the preceding stage due to a sudden decrease in the amount of filtered water in the permeable membrane, and preventing impurities leaked from the damaged permeable membrane in the preceding stage by the permeable membrane in the subsequent stage. It is a proposal.
【０００５】[0005]
精密ろ過膜もしくは限外ろ過膜で透過した処理水には、極めて微細な物質しか 残留しておらず、後段にこれ以上の膜孔径を持つた透過膜を取り付けても、ほと んど抑留されることなく、透過抵抗も少なく、通常時には何等支障がない。 The treated water that has permeated through the microfiltration membrane or ultrafiltration membrane contains only extremely fine substances, and even if a permeation membrane with a membrane pore size larger than this is attached to the treated water, it will be mostly retained. No permeation resistance, low permeation resistance, and no problem during normal operation.
【０００６】 特に、前段に限外ろ過膜、後段に精密ろ過膜を設置した場合などは、前段透過 膜と同一透過差圧で数倍のろ過速度をとれる。 一方、前段の透過膜が損傷し始めると、前段透過膜孔径以上の粒径を持つた物 質が流出し始める。 この段階では、当該透過膜の処理水そのものを連続監視する一般的な水質計器 では、検知できないことが多い。In particular, when an ultrafiltration membrane is installed in the front stage and a microfiltration membrane is installed in the rear stage, a filtration rate several times higher than that of the permeation membrane of the front stage can be obtained. On the other hand, when the former permeable membrane begins to be damaged, a substance having a particle size larger than the former permeable membrane pore diameter begins to flow out. At this stage, it is often impossible to detect with a general water quality meter that continuously monitors the treated water itself of the permeable membrane.
【０００７】 しかし、後段に前段透過膜と同等もしくはそれ以上の膜孔径の透過膜を再度透 過させると、前段透過膜で漏出した物質のうち、後段透過膜孔径以上の物質は、 すべて後段透過膜で抑留することとなり、後段のろ過速度は前段に較べて数倍も 大きいため、後段の透過膜の一次側圧力の急増もしくは後段の透過膜透過水量の 急低下を招く。 圧力もしくは水量は、安価にかなり精密に連続監視できるので、前段の透過膜 損傷を素早く検知できる。 更に、この間も後段の透過膜膜孔径以上の物質はすべて除去できるので、後段 透過膜孔径を必要最低限に選定しておけば、処理水質としては必要最低限の水質 を確保できる。However, when a permeable membrane having a membrane pore size equal to or larger than that of the former permeable membrane is re-permeated in the latter stage, all substances leaked in the former permeable membrane and having a pore size of the latter permeable membrane or more are all permeated in the latter permeable membrane. Since it is retained in the membrane, the filtration rate in the latter stage is several times higher than that in the former stage, which causes a rapid increase in the primary pressure of the permeate membrane in the latter stage or a sharp decrease in the amount of permeate water in the latter stage. Since the pressure or water volume can be continuously monitored inexpensively and fairly precisely, damage to the permeable membrane in the preceding stage can be quickly detected. Further, during this period, all substances having a pore size larger than that of the permeable membrane in the latter stage can be removed. Therefore, if the pore size of the latter stage permeable membrane is selected to the necessary minimum, the minimum required water quality can be secured as the treated water quality.
【０００８】[0008]
次にこの考案を図示の実施例によつて詳細に説明する。 先ず図１に示す第１実施例は、前段に０．１μｍの精密ろ過膜を３本設置する とともに、後段に０．２μｍの精密ろ過膜を１本設置し、前段透過膜４，４’， ４’’の処理水を一括して後段透過膜７に流入させた場合である。 原水管１から受水槽２に流入した原水は、透過膜供給ポンプ３により前段透過 膜４，４’，４’’に供給され、透過水は配管５，５’，５’’及び圧力計６を 経由して後段透過膜７に供給される。 Next, the present invention will be described in detail with reference to the illustrated embodiment. First, in the first embodiment shown in FIG. 1, three 0.1 μm microfiltration membranes were installed in the former stage, and one 0.2 μm microfiltration membrane was installed in the latter stage, and the former permeable membranes 4, 4 ′, This is a case where the treated water of 4 ″ is collectively flowed into the rear permeable membrane 7. Raw water flowing from the raw water pipe 1 into the water receiving tank 2 is supplied to the upstream permeable membranes 4, 4 ′, 4 ″ by the permeable membrane supply pump 3, and the permeated water is provided by the pipes 5, 5 ′, 5 ″ and the pressure gauge 6 And is supplied to the rear permeable membrane 7 via.
【０００９】 この時、後段透過膜７に供給される前段透過膜４，４’，４’’の処理水には 、０．１μｍ以上の物質はないので、後段透過膜７は素通し状態となる。 後段透過膜７を素通しした処理水は、処理水流出管８及び処理水量計９を経由 して、処理水槽１０に流出する。At this time, since the treated water of the pre-stage permeable membranes 4, 4 ′ and 4 ″ supplied to the post-stage permeable membrane 7 does not have a substance of 0.1 μm or more, the post-stage permeable membrane 7 is in a plain state. . The treated water that has passed through the rear permeable membrane 7 flows out to the treated water tank 10 via the treated water outflow pipe 8 and the treated water amount meter 9.
【００１０】 逆流洗浄ポンプ１１を起動させ、弁１２，１２’，１２’’を閉め、弁１３， １３’，１３’’及び弁１５，１５’，１５’’を開けることにより、前段透過 膜４，４’，４’’に付着した目詰まり物質を、排水槽１６に流出させる。 後段透過膜７はほとんど目詰まりしないが、長期間の透過により透過性能が低 下してくることがある。この場合、前段透過膜の逆洗洗浄と同様の方式で、後段 透過膜７を洗浄する。すなわち逆洗洗浄ポンプ１１を起動させ、弁１４を閉め、 弁１７及び弁１８を開けることにより、後段透過膜７に付着した目詰まり物質を 、排水槽１６に流出させる。By starting the backwashing pump 11, closing the valves 12, 12 ′ and 12 ″, and opening the valves 13, 13 ′ and 13 ″ and the valves 15, 15 ′ and 15 ″, the front-stage permeable membrane The clogging substances attached to 4, 4 ′ and 4 ″ are made to flow into the drain tank 16. The rear permeable membrane 7 is hardly clogged, but the permeation performance may deteriorate due to long-term permeation. In this case, the rear permeable membrane 7 is cleaned by the same method as the backwash cleaning of the front permeable membrane. That is, the backwashing / cleaning pump 11 is started, the valve 14 is closed, and the valves 17 and 18 are opened, so that the clogging substance attached to the rear permeable membrane 7 is caused to flow out to the drain tank 16.
【００１１】 前段透過膜４，４’，４’’のいずれかが損傷した場合、配管５，５’，５’ ’を経由して、除去対象物質が後段透過膜７に流入するが、この場合、後段透過 膜７で０．２μｍ以上の物質は捕捉除去し、当面必要最低限の水質を確保した処 理水を処理水槽１０に流出させる。 この間、後段透過膜７は目詰まりしてくるので、一次側圧力計６の圧力急上昇 を招き、さらに処理水量の急低下を招くので処理水量計９の指示値が下がる。 したがつて、圧力計６もしくは流量計９の連続監視により、前段透過膜４，４ ’，４’’の損傷の検知ができるとともに、当面必要最低限の水質を確保できる こととなる。If any of the former permeable membranes 4, 4 ′ and 4 ″ is damaged, the substance to be removed flows into the latter permeable membrane 7 via the pipes 5, 5 ′ and 5 ′. In this case, a substance having a thickness of 0.2 μm or more is captured and removed by the rear permeable membrane 7, and the treated water in which the minimum necessary water quality is secured for the time being is allowed to flow out to the treated water tank 10. During this period, the rear-stage permeable membrane 7 becomes clogged, which causes a sudden increase in the pressure of the primary side pressure gauge 6 and a sharp decrease in the treated water quantity, so that the indicated value of the treated water quantity meter 9 decreases. Therefore, by continuously monitoring the pressure gauge 6 or the flowmeter 9, it is possible to detect damage to the front permeable membranes 4, 4 ′ and 4 ″ and to secure the minimum necessary water quality for the time being.
【００１２】 次に図２に示す第２実施例は、前段に０．１μｍの精密ろ過膜を設置するとと もに、後段に０．２μｍの孔径で透過膜面積が前段の１／３の精密ろ過膜を直列 に設置し、前段透過膜処理水を後段透過膜に流入させた場合である。 原水は、原水管１より受水槽２に流入し、透過膜供給ポンプ３により前段透過 膜４に供給され、透過水は配管５及び圧力計６を経由して後段透過膜７に供給さ れる。 この時、後段透過膜７に供給される前段透過膜処理水には０．１μｍ以上の物 質はないので、後段透過膜７は素通し状態となる。Next, in a second embodiment shown in FIG. 2, a microfiltration membrane of 0.1 μm is installed in the former stage, and a pore size of 0.2 μm is provided in the latter stage, and the permeable membrane area is 1/3 that of the former stage. This is a case where the filtration membranes are installed in series and the treated water of the former permeable membrane is allowed to flow into the latter permeable membrane. Raw water flows from the raw water pipe 1 into the water receiving tank 2, and is supplied to the upstream permeable membrane 4 by the permeable membrane supply pump 3, and the permeated water is supplied to the downstream permeable membrane 7 via the pipe 5 and the pressure gauge 6. At this time, since the front-stage permeable membrane-treated water supplied to the rear-stage permeable membrane 7 does not have a substance having a size of 0.1 μm or more, the rear-stage permeable membrane 7 is in a plain state.
【００１３】 このため、前段透過膜４の残圧でも、前段透過膜４に較べ、５倍の透過速度を とれる。 後段透過膜７を素通しした処理水は処理水流出管８及び処理水量計９を経由し て、処理水槽１０に流出する。 この状態を継続していると、前段透過膜４は目詰まりしてくるので、定期的に 逆洗洗浄する。Therefore, even with the residual pressure of the front permeable membrane 4, the permeation speed can be five times higher than that of the front permeable membrane 4. The treated water that has passed through the rear permeable membrane 7 flows out to the treated water tank 10 via the treated water outflow pipe 8 and the treated water amount meter 9. If this state is continued, the front permeable membrane 4 will be clogged, so backwashing is regularly performed.
【００１４】 逆洗洗浄は、逆流洗浄ポンプ１１を起動させ、弁１２を閉め、弁１３及び１５ を開けることにより、前段透過膜４に付着した目詰まり物質を、排水槽１６に流 出させる。 後段透過膜７はほとんど目詰まりしないが、長期間の透過により透過性能が低 下してくることがある。この場合、前段透過膜４の逆洗洗浄と同様の方式で後段 透過膜７を洗浄する。すなわち、逆洗洗浄ポンプ１１を起動させ、弁１４を閉め 、弁１７及び１８を開けることにより、後段透過膜７に付着した目詰まり物質を 、排水槽１６に流出させる。In the backwash cleaning, the backwash pump 11 is activated, the valve 12 is closed, and the valves 13 and 15 are opened, so that the clogging substance attached to the front permeable membrane 4 is drained to the drain tank 16. The rear permeable membrane 7 is hardly clogged, but the permeation performance may deteriorate due to long-term permeation. In this case, the rear permeable membrane 7 is washed by the same method as the back washing of the front permeable membrane 4. That is, the backwashing / cleaning pump 11 is activated, the valve 14 is closed, and the valves 17 and 18 are opened, so that the clogging substance attached to the rear permeable membrane 7 is caused to flow out to the drain tank 16.
【００１５】 前段透過膜４が損傷した場合、配管５を経由して除去対象物質が、後段透過膜 ７に流入するが、この場合、後段透過膜４で０．２μｍ以上の物質は捕捉除去し 、当面必要最低限の水質を確保した処理水を、処理水槽１０に流出させる。 この間、後段透過膜７は目詰まりしてくるので、一次側圧力計６の圧力急上昇 を招き、さらに処理水量の急低下を招くので、処理水量計９の指示値が下がる。 したがつて、圧力計６もしくは流量計９の連続監視により前段透過膜４の損傷 の検知ができるとともに、当面必要最低限の水質を確保できることとなる。When the former permeable membrane 4 is damaged, the substance to be removed flows into the latter permeable membrane 7 via the pipe 5, but in this case, the latter permeable membrane 4 traps and removes the substance of 0.2 μm or more. The treated water having the minimum required water quality for the time being is allowed to flow into the treated water tank 10. During this period, the rear permeable membrane 7 becomes clogged, which causes a sudden increase in the pressure of the primary side pressure gauge 6 and a sharp decrease in the amount of treated water, so that the indicated value of the treated water quantity meter 9 decreases. Therefore, by continuously monitoring the pressure gauge 6 or the flowmeter 9, it is possible to detect the damage of the front permeable membrane 4 and to secure the minimum required water quality for the time being.
【００１６】[0016]
この考案の上述の構成からなるろ過装置によれば、従来連続検知不能であつた 透過膜の損傷の発生を素早く検知し、これに対応することができるという効果を 奏するものである。 According to the filtration device having the above-described configuration of the present invention, it is possible to quickly detect the occurrence of damage to the permeable membrane, which has been conventionally impossible to detect continuously, and to respond to this.
【図１】この考案の装置の第１実施例の構成図である。FIG. 1 is a block diagram of a first embodiment of the device of the present invention.
【図２】この考案の装置の第２実施例の構成図である。FIG. 2 is a block diagram of a second embodiment of the device of the present invention.
４，４’，４’’ 前段透過膜 ７ 後段透過膜 4,4 ', 4 "pre-stage permeable membrane 7 post-stage permeable membrane
Claims (2)
過膜を使用したろ過装置において、複数の透過膜の後段
に、前段透過膜と同等もしくは前段透過膜より大きな膜
孔径を有する透過膜を、前段透過膜と同数もしくは前段
透過膜より少ない本数設け、前段透過膜のいずれかの損
傷時に、後段の透過膜の一次側の圧力の急上昇もしくは
後段の透過膜ろ過水量の急低下により、前段の透過膜の
損傷を検知するとともに、損傷した前段の透過膜から漏
出した不純物を後段の透過膜で阻止することを特徴とす
る透過膜によるろ過装置。1. A filtration device using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane, wherein a permeable membrane having a membrane pore size equal to or larger than that of the preceding permeable membrane is provided after the plurality of permeable membranes. The same number as the front-stage permeation membrane or a smaller number than the front-stage permeation membrane is provided. A filtration device using a permeable membrane, which detects damage to the permeable membrane and prevents impurities leaked from the damaged permeable membrane at the preceding stage by the permeable membrane at the subsequent stage.
過膜を使用したろ過装置において、透過膜の後段に、前
段透過膜と同等もしくは前段透過膜より大きな膜孔径を
有し、かつ前段透過膜とほぼ同一のろ過流量となる透過
面積をもつ透過膜を設け、前段の透過膜の損傷時に、後
段の透過膜の一次側の圧力の急上昇もしくは後段の透過
膜ろ過水量の急低下により、前段の透過膜の損傷を検知
するとともに、損傷した前段の透過膜から漏出した不純
物を、後段の透過膜で阻止することを特徴とする透過膜
によるろ過装置。2. A filtration device using a permeable membrane such as a microfiltration membrane or an ultrafiltration membrane, wherein the latter stage of the permeable membrane has a membrane pore size equal to or larger than that of the former stage permeable membrane and the former stage permeable membrane. A permeation membrane with a permeation area that provides almost the same filtration flow rate as the membrane is provided.When the permeation membrane in the previous stage is damaged, the pressure on the primary side of the permeation membrane of the latter stage suddenly rises or the permeation membrane filtered water volume of the latter stage suddenly decreases. The filtration device using a permeable membrane, which detects damage to the permeable membrane of 1. and prevents impurities leaked from the damaged permeable membrane of the preceding stage by the permeable membrane of the subsequent stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6510092U JPH0621728U (en) | 1992-08-26 | 1992-08-26 | Filter by permeable membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6510092U JPH0621728U (en) | 1992-08-26 | 1992-08-26 | Filter by permeable membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0621728U true JPH0621728U (en) | 1994-03-22 |
Family
ID=13277156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6510092U Pending JPH0621728U (en) | 1992-08-26 | 1992-08-26 | Filter by permeable membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621728U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013105728A1 (en) * | 2012-01-09 | 2013-07-18 | 두산중공업 주식회사 | Device for measuring pollution index of filtration membrane |
| JP2021522794A (en) * | 2018-05-04 | 2021-09-02 | ジェンザイム・コーポレーション | Perfusion bioreactor with filtration system |
| WO2024100713A1 (en) * | 2022-11-07 | 2024-05-16 | 株式会社クボタ | Monitoring device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6025510A (en) * | 1983-07-22 | 1985-02-08 | Asahi Chem Ind Co Ltd | Method for detecting leakage of filter apparatus |
-
1992
- 1992-08-26 JP JP6510092U patent/JPH0621728U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6025510A (en) * | 1983-07-22 | 1985-02-08 | Asahi Chem Ind Co Ltd | Method for detecting leakage of filter apparatus |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013105728A1 (en) * | 2012-01-09 | 2013-07-18 | 두산중공업 주식회사 | Device for measuring pollution index of filtration membrane |
| US9579607B2 (en) | 2012-01-09 | 2017-02-28 | Doosan Heavy Industries & Construction Co., Ltd. | Device for measuring pollution index of filtration membrane |
| JP2021522794A (en) * | 2018-05-04 | 2021-09-02 | ジェンザイム・コーポレーション | Perfusion bioreactor with filtration system |
| WO2024100713A1 (en) * | 2022-11-07 | 2024-05-16 | 株式会社クボタ | Monitoring device |
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