JPH0435300B2 - - Google Patents
Info
- Publication number
- JPH0435300B2 JPH0435300B2 JP58233611A JP23361183A JPH0435300B2 JP H0435300 B2 JPH0435300 B2 JP H0435300B2 JP 58233611 A JP58233611 A JP 58233611A JP 23361183 A JP23361183 A JP 23361183A JP H0435300 B2 JPH0435300 B2 JP H0435300B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- oil
- time change
- temperature sensor
- temperature difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003921 oil Substances 0.000 claims description 25
- 239000010720 hydraulic oil Substances 0.000 claims description 20
- 230000002159 abnormal effect Effects 0.000 claims description 13
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 description 6
- 238000010008 shearing Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0003—Arrangements for preventing undesired thermal effects on tools or parts of the machine
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
Description
【発明の詳細な説明】
この発明は、例えばプレス機械、シヤーリング
マシン、その他の油圧作動機械における作動油の
油温の異常上昇を監視する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for monitoring an abnormal rise in the temperature of hydraulic oil in, for example, a press machine, a shearing machine, or other hydraulically operated machines.
周知のように、例えばプレス機械やシヤーリン
グマシン、その他の油圧作動機械においては、機
械を始動して次第に時間が経過すると、作動温の
の温度が上昇するものである。 As is well known, in press machines, shearing machines, and other hydraulically operated machines, the operating temperature gradually increases over time after the machine is started.
すなわち、機械の始動時には、油圧機器の発熱
源と外気との温度差が小さく、発熱源からの放熱
量が少ないものであり、発熱源の熱は、作動油等
の温度上昇に使われることとなる。したがつて、
機械の始動時における作動油等の温度上昇が急激
に行なわれるものである。そして、作動油等があ
る程度上昇して、外気との温度差が大きくなつて
放熱量が大きくなると、平衡状態となつて、作動
油等の温度はほぼ一定に保持されるものである。 In other words, when starting a machine, the temperature difference between the heat source of the hydraulic equipment and the outside air is small, and the amount of heat radiated from the heat source is small, and the heat from the heat source is used to raise the temperature of the hydraulic oil, etc. Become. Therefore,
When starting a machine, the temperature of hydraulic oil, etc. increases rapidly. Then, when the hydraulic oil etc. rises to a certain extent and the temperature difference with the outside air becomes large and the amount of heat dissipated increases, an equilibrium state is reached and the temperature of the hydraulic oil etc. is maintained almost constant.
したがつて、外気の温度変化を測定することな
く作動油の温度変化のみを測定していたのでは、
作動油の温度上昇が異常であるか否かを正確に検
知することが困難になる。例えば町工場において
午後に窓から直射日光が機械に直接照射されるよ
うな場合には、午前と午後では作動油の温度の上
昇傾向が大きく異なるものであるから、機械の周
囲の外気温を測定することが必要である。 Therefore, it is possible that only the temperature change of the hydraulic oil was measured without measuring the temperature change of the outside air.
It becomes difficult to accurately detect whether the temperature rise of the hydraulic oil is abnormal. For example, in a small factory where direct sunlight shines directly onto machinery through windows in the afternoon, it is necessary to measure the outside air temperature around the machinery, since the rise in temperature of the hydraulic oil will be very different in the morning and afternoon. It is necessary to.
ところで、周知のように、プレス機械やシヤー
リングマシンにおいての無負荷運転時の発生熱量
よりも加圧や剪断時等のように負荷が作用してい
る負荷運転時の発生熱量が大であるから、作動油
の温度上昇の傾向を知ることにより、例えば工具
が摩耗状態にあつて高負荷運転状態にある等の異
常状態を知ることができるものである。 By the way, as is well known, the amount of heat generated during no-load operation in a press machine or shearing machine is greater than the amount of heat generated during loaded operation such as during pressurization or shearing. By knowing the tendency of the temperature rise of the hydraulic oil, it is possible to know an abnormal state, for example, when the tool is in a worn state and is operating under a high load.
また、例えば油圧機器からの圧力の洩れが多く
なつて油圧ポンプが余分に駆動されるときや、例
えば圧力設定バルブのオリフイス、チヨーク等に
詰りを生じたり、あるいは穴径が大きくなつたと
きなどにも油圧ポンプが余分に駆動されることと
なり、作動油の温度上昇が常態よりも大きくなる
ものである。 Also, for example, when pressure leaks from hydraulic equipment increases and the hydraulic pump is driven extra, for example, when the orifice or choke of the pressure setting valve becomes clogged, or when the hole diameter becomes large, etc. In this case, the hydraulic pump is driven extra, and the temperature of the hydraulic oil increases more than normal.
したがつて、作動油の温度上昇の異常を検知す
ることにより、例えば油圧機器の異常状態を知る
ことができるものである。 Therefore, by detecting an abnormality in the temperature rise of the hydraulic oil, it is possible to know, for example, an abnormal state of the hydraulic equipment.
すなわち、作動油の温度上昇の異常を検知する
ことにより、例えば機械の高負荷運転状態の異常
あるいは油圧機器の異常状態など、機械が異常状
態にあることを検知することができるものであ
る。 That is, by detecting an abnormality in the temperature rise of the hydraulic oil, it is possible to detect that the machine is in an abnormal state, such as an abnormal high-load operating state of the machine or an abnormal state of hydraulic equipment.
ところで、従来は、例えば作動油をほぼ一定の
温度に保持すべく、作動油を加熱、冷却する制御
が一般的であり、作動油の温度上昇の異常を外気
温との関係において検知するようなことは行われ
ていないのが一般的である。 By the way, in the past, for example, in order to maintain the hydraulic oil at a substantially constant temperature, it was common to control the hydraulic oil by heating and cooling it, and there was a control method that detected abnormalities in the temperature rise of the hydraulic oil in relation to the outside temperature. This is generally not done.
本発明は、上述の如き問題に鑑みてなされたも
のである。 The present invention has been made in view of the above-mentioned problems.
以下、図に示す実施例について詳説する。第１
図にこの発明の一実施例の油圧式シヤー１を示
し、作動油タンク３に油温センサ５が設置され、
シヤー１の外側に気温センサ７が設置されてい
る。 The embodiment shown in the figures will be explained in detail below. 1st
The figure shows a hydraulic shear 1 according to an embodiment of the present invention, in which an oil temperature sensor 5 is installed in a hydraulic oil tank 3.
A temperature sensor 7 is installed outside the shear 1.
第２図はこれら油温センサ５と気温センサ７と
の温度信号の処理装置部分を示し、油温センサ５
と気温センサ７とはＡ／Ｄ変換装置９に接続され
ている。そしてこの変換装置９は中央演算処理装
置１１に接続されている。この中央演算処理装置
１１には、さらに記憶装置１３と計時装置１５と
が接続され、また出力インターフエイス１７も接
続されている。 FIG. 2 shows the temperature signal processing device part of these oil temperature sensor 5 and air temperature sensor 7.
and the temperature sensor 7 are connected to an A/D converter 9. This conversion device 9 is connected to a central processing unit 11. A storage device 13 and a clock device 15 are further connected to the central processing unit 11, and an output interface 17 is also connected thereto.
ここで、油圧作動機械は一般にその連続稼働に
より時間と共に作動油の油温が上昇する。その油
温の上昇カーブは、稼働時間を横軸にとり、油温
と室温との温度差Tiを縦軸にとるとき第３図に示
すようなものになる。そこで、機械の作動後一定
時間経過毎の温度差の時間変化ΔTiを、ｉ−１時
点とｉ時点との温度差からΔTi＝Ti−Ti-1として
計算し、記憶装置１３に比較値として記憶させて
ある。尚、この比較値は機械の種類や仕様、さら
にユーザーの使用状態によつて変化するものであ
るから、実験的に定める必要がある。 Generally, in a hydraulically operated machine, the temperature of the hydraulic oil increases over time due to its continuous operation. The oil temperature increase curve becomes as shown in FIG. 3 when the horizontal axis is the operating time and the vertical axis is the temperature difference T i between the oil temperature and the room temperature. Therefore, the time change ΔT i in the temperature difference every certain period of time after machine operation is calculated from the temperature difference between time i-1 and time i as ΔT i =T i −T i-1 , and is stored in the storage device 13. It is stored as a comparison value. Note that this comparison value changes depending on the type and specifications of the machine, as well as the usage conditions of the user, and therefore needs to be determined experimentally.
油温センサ５と気温センサ７とによる計測温度
信号は、計時装置１５により定められた一定時間
毎、例えば30分毎にＡ／Ｄ変換装置９を経て中央
演算処理装置１１に入力され、各時点ｉにおける
温度差tiが算出される。そして、この温度差tiが
記憶装置１３に記憶される。 The temperature signals measured by the oil temperature sensor 5 and the air temperature sensor 7 are input to the central processing unit 11 via the A/D converter 9 at fixed time intervals determined by the clock device 15, for example, every 30 minutes, and are inputted to the central processing unit 11 at each time point. The temperature difference t i at i is calculated. This temperature difference t i is then stored in the storage device 13.
中央演算処理装置１１はさらに、両センサ５，
７からの温度信号を処理して温度差tiを算出する
時、記憶装置１３に記憶されている前回のｉ−１
時点の温度差ti-1と比較し、油温上昇の時間変化
分Δti（＝ti−ti-1）をも算出する。そして、この油
温上昇の時間変化Δtiを記憶装置１３に予め記憶
されている前記の正常時の油温上昇の比較値ΔTi
と比較し、ΔtiｔがΔTiより大きい時に機械に異
常が発生しているものと判断し、出力インターフ
エイス１７を介して機械の非常停止や異常警報の
発令などを行なう、
こうして、中央演算処理装置１１は計時装置１
５が計時する一定時間経過毎に上記のΔtiｔと
ΔTiとの比較をなし、油温の異常上昇を監視する
のである。 The central processing unit 11 further includes both sensors 5,
When calculating the temperature difference t i by processing the temperature signal from 7, the previous i-1 stored in the storage device 13 is used.
The time change amount Δt i (=t i −t i- 1 ) of the oil temperature rise is also calculated by comparing with the temperature difference t i-1 at the time. Then, the time change Δt i of this oil temperature rise is compared with the above-mentioned normal oil temperature rise prestored in the storage device 13 ΔT i
When Δt i t is larger than ΔT i , it is determined that an abnormality has occurred in the machine, and an emergency stop of the machine or an abnormality alarm is issued via the output interface 17. The processing device 11 is the clock device 1
5, the above-mentioned Δt i t and ΔT i are compared every time a certain period of time elapses, and an abnormal rise in oil temperature is monitored.
以上のごとき実施例の説明より理解されるよう
に、要するに本発明は、油圧作動機械における油
温監視装置にして、前記油圧作動機械の外周部分
の気温を計測する気温センサ７と、作動油の油温
を計測する油温センサ５と、記憶装置１３と、計
時装置１５と、中央演算処理装置１１とを備えて
なり、前記記憶装置１３は前記油圧作動機械の正
常運転時における油温と気温との温度差の時間変
化ΔTを記憶しており、前記中央演算処理装置１
１は前記計時装置１５が計時する適宜時間毎に前
記油温センサ５と気温センサ７とにより計測され
た温度の温度差の時間変化Δtを演算して前記記
憶装置１３に予じめ記憶されている対応時点の前
記温度差の時間変化ΔTと比較演算し、実測温度
差の時間変化Δtが異常に大きいときに異常信号
を発信する構成である。 As can be understood from the above description of the embodiments, the present invention is an oil temperature monitoring device for a hydraulically operated machine, and includes an air temperature sensor 7 that measures the temperature of the outer circumferential portion of the hydraulically operated machine, and a It includes an oil temperature sensor 5 for measuring oil temperature, a storage device 13, a timing device 15, and a central processing unit 11, and the storage device 13 stores oil temperature and air temperature during normal operation of the hydraulic machine. The central processing unit 1 stores the time change ΔT of the temperature difference between the
1 calculates a time change Δt of the temperature difference between the temperatures measured by the oil temperature sensor 5 and the air temperature sensor 7 at each appropriate time measured by the clock device 15, and stores the result in the storage device 13 in advance. The configuration is such that a comparison calculation is made with the time change ΔT of the temperature difference at the corresponding point in time, and an abnormality signal is transmitted when the time change Δt of the measured temperature difference is abnormally large.
上記構成より明らかなように、本発明において
は、外気温度と作動油との温度差の時間変化Δt
を演算し、記憶装置に記憶してある正常運転時に
おける油温と気温との温度差の時間変化ΔTと比
較して、実測温度差の時間変化Δtが異常に大き
いときに異常信号を発信するものであるから、外
気温の変化に大きく影響されることなしに油温の
異常上昇を検知できることとなり、正常運転から
異常運転に移行した場合に、異常運転を検知で
き、例えば運転を停止するなどして安全性をより
向上することができるものである。 As is clear from the above configuration, in the present invention, the time change Δt of the temperature difference between the outside air temperature and the hydraulic oil is
is calculated and compared with the time change ΔT of the temperature difference between oil temperature and air temperature during normal operation stored in the storage device, and an abnormal signal is sent when the time change Δt of the measured temperature difference is abnormally large. Therefore, it is possible to detect an abnormal rise in oil temperature without being significantly affected by changes in outside temperature, and when normal operation shifts to abnormal operation, it is possible to detect abnormal operation and, for example, to stop operation. This can further improve safety.
第１図はこの発明の一実施例の用いられている
油圧式シヤーの概略側面図、第２図は同上実施例
のブロツク図、第３図は同上で用いられる油温上
昇モデルカーブの一例である。
３……作動油タンク、５……油温センサ、７…
…気温センサ、９……Ａ／Ｄ変換装置、１１……
中央演算処理装置、１３……記憶装置、１５……
計時装置。
Fig. 1 is a schematic side view of a hydraulic shear used in an embodiment of the present invention, Fig. 2 is a block diagram of the same embodiment, and Fig. 3 is an example of an oil temperature rise model curve used in the above embodiment. be. 3... Hydraulic oil tank, 5... Oil temperature sensor, 7...
...Temperature sensor, 9...A/D converter, 11...
Central processing unit, 13...Storage device, 15...
Timekeeping device.
Claims (1)
前記油圧作動機械の外周部分の気温を計測する気
温センサ７と、作動油の油温を計測する油温セン
サ５と、記憶装置１３と、計時装置１５と、中央
演算処理装置１１とを備えてなり、前記記憶装置
１３は前記油圧作動機械の正常運転時における油
温と気温との温度差の時間変化ΔTを記憶してお
り、前記中央演算処理装置１１は前記計時装置１
５が計時する適宜時間毎に前記油温センサ５と気
温センサ７とにより計測された温度の温度差の時
間変化Δtを演算して前記記憶装置１３に予じめ
記憶されている対応時点の前記温度差の時間変化
ΔTと比較演算し、実測温度差の時間変化Δtが異
常に大きいときに異常信号を発信する構成である
ことを特徴とする油温監視装置。1. As an oil temperature monitoring device for hydraulically operated machines,
The hydraulic machine includes an air temperature sensor 7 that measures the air temperature at the outer circumference of the hydraulic machine, an oil temperature sensor 5 that measures the temperature of hydraulic oil, a storage device 13, a timing device 15, and a central processing unit 11. The storage device 13 stores the time change ΔT of the temperature difference between the oil temperature and the air temperature during normal operation of the hydraulic machine, and the central processing unit 11 stores the time change ΔT of the temperature difference between the oil temperature and the air temperature during normal operation of the hydraulic machine.
5 calculates the time change Δt of the temperature difference between the temperatures measured by the oil temperature sensor 5 and the air temperature sensor 7 at appropriate time intervals, and calculates the time change Δt of the temperature difference between the temperatures measured by the oil temperature sensor 5 and the air temperature sensor 7, and calculates the time change Δt at the corresponding time point stored in advance in the storage device 13. An oil temperature monitoring device characterized in that it is configured to perform a comparison calculation with a time change ΔT of a temperature difference and to issue an abnormal signal when the time change Δt of an actual measured temperature difference is abnormally large.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23361183A JPS60127944A (en) | 1983-12-13 | 1983-12-13 | Oil-temperature monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23361183A JPS60127944A (en) | 1983-12-13 | 1983-12-13 | Oil-temperature monitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60127944A JPS60127944A (en) | 1985-07-08 |
| JPH0435300B2 true JPH0435300B2 (en) | 1992-06-10 |
Family
ID=16957756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23361183A Granted JPS60127944A (en) | 1983-12-13 | 1983-12-13 | Oil-temperature monitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60127944A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5904457A (en) * | 1996-06-26 | 1999-05-18 | The Gleason Works | Detecting tool wear by thermal monitoring of workpiece |
| CN109405890B (en) * | 2018-12-17 | 2021-01-26 | 四川泛茂科技股份有限公司 | Automatic oiling monitoring method for diesel generating set and system for realizing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55112747A (en) * | 1979-02-13 | 1980-08-30 | Toyoda Mach Works Ltd | Work device with temperature control function |
-
1983
- 1983-12-13 JP JP23361183A patent/JPS60127944A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55112747A (en) * | 1979-02-13 | 1980-08-30 | Toyoda Mach Works Ltd | Work device with temperature control function |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60127944A (en) | 1985-07-08 |
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