WO2019031366A1

WO2019031366A1 - Abnormality detection device for lubrication system

Info

Publication number: WO2019031366A1
Application number: PCT/JP2018/028925
Authority: WO
Inventors: 和田　耕一
Original assignee: リューベ株式会社
Priority date: 2017-08-10
Filing date: 2018-08-01
Publication date: 2019-02-14
Also published as: JP2019035429A; TW201923277A; TWI770250B; JP6863588B2

Abstract

This abnormality detection device is provided with: a plurality of flow detectors 30 that detect the flow of lubricating oil by opening/closing respective valve bodies 40; a temperature sensor S that detects the temperature of the lubricating oil; and a management unit 60 that conducts abnormality management of a lubricating system J on the basis of the detected temperature of the temperature sensor S and opening/closing of the valve bodies 40 of the flow detectors 30. The management unit 60 is provided with: an opening/closing detection means 62 for detecting opening/closing of the valve bodies 40 of the flow detectors 30; an opening start time calculation means 63 for calculating the opening start time of the valve bodies 40; an opening start time determination means 66 for determining whether the opening start time of the valve bodies 40 is within an appropriate opening start time range derived from the correlation with the temperature of the lubricating oil; and an abnormality determination means 67 for determining an abnormality when the opening start time determination means 66 determines that the opening start time is outside the range for at least one of the flow detectors 30.

Description

Lubrication system abnormality detection device

The present invention relates to, for example, an abnormality detection device for a lubrication system which detects an abnormality in a lubrication system which is provided in an industrial machine such as an injection molding machine or a machine tool and supplies lubricant oil such as grease and oil.

Generally, as shown in FIG. 13, for example, in an injection molding machine M, a lubrication system for supplying a lubricating oil such as grease and oil is provided. The injection molding machine M includes an injection unit 2 and a mold clamping unit 3 in a machine base 1. The injection unit 2 includes an injection cylinder 6 which heats and melts the resin from the hopper 4 and injects the mold 5 of the mold clamping unit 3 with a screw (not shown). The injection unit 2 includes an injection drive unit 7 provided with a rotation mechanism for rotationally driving a screw in the injection cylinder 6 and a ball screw mechanism B for moving the screw back and forth, and a front and back provided with a ball screw mechanism B for moving the injection cylinder 6 back and forth A dynamic drive unit 8 is provided. On the other hand, the mold clamping unit 3 includes a fixed board 10 fixed on the machine base 1 and supporting the fixed mold 5a, a movable board 11 supporting the movable mold 5b axially movable with respect to the fixed board 10, and movable A toggle mechanism T provided between the disc 11 and the rear disc 12 for driving the movable disc 11 in a mold closing direction or a mold opening direction, and a drive unit 13 provided with a ball screw mechanism B for driving the toggle mechanism T Have.

And in this injection molding machine M, lubricating oil, such as grease and oil, is supplied to the required lubricating location L by the lubrication system J. The lubrication point L is provided at various places such as a rotating portion formed of the shaft and bearing of the toggle mechanism T, a screw shaft of the ball screw mechanism B, and a meshed portion formed of a nut meshed with the screw shaft via a ball. As shown in FIG. 13, the lubrication system J includes, for example, a lubrication pump 20 for supplying a lubricating oil, and a plurality of metering valves V operated by pressurizing and depressurizing the lubricating oil are attached to the junction 21 The main pipe 22 for feeding lubricating oil from the lubricating pump 20 is connected to the junction 21 and a hole-like lubricating port P is formed in the mechanical member provided with the lubricating point L, and each metering valve V to the lubricating port P The oil supply piping 23 is connected to reach the lubricating point L intermittently to supply the lubricating oil discharged from each metering valve V. For example, the lubrication port P of the toggle mechanism T is formed in a housing that holds the bearing, and the lubrication port P of the ball screw mechanism B is formed in a nut. Several types of flow rates per shot of the metering valve V are prepared, for example, in the range of 0.005 cc to 1 cc, and one or more types are selected from these according to the lubrication point L.

The lubrication system J includes an abnormality detection device that detects an abnormality in the lubrication system, and makes safety by observing whether or not the lubricating oil is normally supplied. As the abnormality detection device, for example, a flow detector Ka as disclosed in Japanese Utility Model Application Publication No. 53-16743 can be used.

As shown in FIG. 14, the flow detector Ka includes a main body 100 made of an insulator having a fluid space E having a cylindrical inner surface through which lubricating oil can pass, and at the one end of the fluid space E A lubricating oil supply port 102 having a supply opening 101 centered on the central axis P of the fluid space E is formed, and a lubricating oil discharge port having a discharge opening 103 communicating with the fluid space E on the side of the main body 100 104 is formed. Further, the main body 100 is provided with one electrode 105 made of a conductor and a forming member of the supply opening 101, and has an exposed portion 106 exposed on the other end side of the fluid space E and a conductor insulated with respect to the one electrode 105 And the other electrode 107 is provided. The main body 100 is moved along the central axis P of the fluid space E into the fluid space E and abuts on the opening edge 108 of the supply opening 101 to close the supply opening 101 while separating from the supply opening 101 A valve body 110 made of a conductor for opening the supply opening 101 is accommodated. Further, in the fluid space E, one end is connected to the valve body 110 and the other end is connected to the exposed portion 106 of the other electrode 107 so that the valve body 110 is always biased in the direction to close the supply opening 101. The body coil spring 111 is accommodated. On the other hand, the valve body 110 is slidably inserted with the tip end portion 112 protruding with the axis line along the central axis P of the fluid space E, and the one end side of the coil spring 111 is accommodated at the proximal end side A cylindrical guide member 114 having a sliding hole 113 is fixed. The lubricating oil flow detection device Ka constitutes a so-called check valve by opening and closing the valve body 110.

And the abnormality detection apparatus using this flow detection apparatus Ka attaches the flow detection apparatus Ka to each lubrication port P, for example, and connects the oil supply piping 23 to this. Then, each flow detection device Ka is connected to a management unit (not shown) through the wiring 115 connected to the one electrode 105 and the wiring 116 connected to the other electrode 107. The management unit always applies a voltage to the electric circuit composed of the one electrode 105, the valve body 110, the coil spring 111 and the other electrode 107, and the connection when the valve body 110 of the electric circuit is closed. The disconnection at the time of opening is electrically detected, and when the detection of opening and closing is not performed, it is notified that there is an abnormality.

Japanese Utility Model Application Publication No. 53-16743

By the way, in the abnormality detection device using the flow detection device Ka of lubricating oil described above, in the lubrication system J, the flow detection device Ka is connected to the oil supply pipe 23 extending from the metering valve V to the lubrication point L to perform lubrication. When detecting the flow of oil, for example, even if trouble occurs due to a pipe leak in the main pipe 22 or the oil supply pipe 23, clogging, or sticking of the lubricating oil in the valve V, the lubricating oil may flow slightly. There is a problem that the fluid flow detection device Ka detects excessive flow and detects the flow of the lubricating oil and determines that it is normal, so that it is not possible to make an accurate abnormality determination.

The present invention has been made in view of the above problems, and provides an abnormality detection device for a lubrication system that can accurately determine abnormality as wide as possible based on detection of opening and closing of a valve body. The purpose is

In order to achieve such an object, the abnormality detection device for a lubrication system according to the present invention starts and stops the lubrication pump, feeds lubricating oil from the lubrication pump to the main pipe at the time of start, and connects a plurality of main pipes In an abnormality detection device provided in a lubrication system for intermittently supplying lubricating oil from a metering valve to a lubrication port via an oil supply pipe,
A flow detector provided in each of the lubrication ports and detecting the flow of lubricating oil by opening and closing of an internal valve body, a temperature sensor for detecting the temperature of the lubricating oil, opening and closing of valve bodies of the respective flow detectors And a management unit that performs abnormality management of the lubrication system based on the temperature detected by the temperature sensor.
The management unit includes start / stop recognition means for recognizing start and stop of the lubricating pump, open / close detection means for detecting opening and closing of the valve body of each flow detector, and the start for each flow detector. Opening start time calculation means for calculating an open start time until the open / close detection means detects opening of the valve body after the stop recognition means recognizes start, and for each of the flow detectors, the temperature of the lubricating oil and Correlation stored in the correlation storage means from the correlation storage means for storing the correlation with the appropriate proper opening start time range of the valve body and the temperature detected by the temperature sensor in each of the flow detectors The appropriate opening start time range deriving means for deriving the appropriate opening start time range based on the data, and the opening start time calculated by the opening start time calculating means for each of the flow detectors is the appropriate opening start time range deriving means Derived Open start time judging means for judging whether it is within the normal open start time range or out of the range; abnormality judging means for judging as abnormal when the open start time judging means judges that at least one flow detector is out of range; As a configuration.

As a result, when the lubricating pump of the lubricating system is started and the lubricating oil is supplied to the main pipe, the lubricating oil is supplied from the plurality of metering valves connected to the main pipe to the lubricating port through the oil supply pipe. In response to this, in the flow detector, the lubricating oil acts on the internal valve body, the valve body is opened, and the lubricating oil is supplied to the lubricating port. When the supply of lubricating oil from the metering valve is stopped, the valve body is closed back. The flow detector detects the flow of lubricating oil by opening and closing the valve body. On the other hand, the temperature sensor detects the temperature of the lubricating oil.

In the management unit, the start / stop recognition means recognizes the start and stop of the lubrication pump, and the open / close detection means detects the opening and closing of the valve body of the flow detector. Further, the open start time calculation means calculates, for each flow detector, an open start time from when the start / stop recognition means recognizes the start to when the open / close detection means detects the opening of the valve body. On the other hand, in the correlation storage means, the correlation between the temperature of the lubricating oil and the appropriate proper opening start time range of the valve body is stored for each flow detector, and the proper opening start time range deriving means is a temperature sensor The appropriate opening start time range at the corresponding temperature is stored from the detected temperature in the correlation storage means.
Then, for each flow detector, the open start time determining unit determines whether the calculated open start time is within the appropriate open start time range derived by the appropriate open start time range deriving unit or not. When it is judged that the value is within the range, it is judged as normal, and when it is judged as being out of the range, the abnormality judging means judges that it is abnormal.

Therefore, it is determined whether the open start time of the valve body is within the proper open start time range which is correlated with the temperature of the lubricating oil or not. You will be able to judge abnormalities. If it is determined that the open start time of the valve body is out of the proper open start time range, it can be determined that the lubrication system has some trouble.

And, if necessary, the open start time determining means determines whether the open start time is smaller than the minimum value of the appropriate open start time range derived by the appropriate open start time range deriving means or the appropriate open It has a function to determine whether it is larger than the maximum value of the start time range,
In the abnormality judging means, when the open start time judging means judges that the open start time is smaller than the minimum value for each of the flow detectors, it is judged as "early start abnormality" and the note open start time is maximum value When it is determined to be larger, there is provided a function to distinguish and judge as "late start abnormality".

That is, in the case of "early start abnormality" in which the valve body of the flow detector starts to open earlier than the appropriate opening start time, for example, know that the slide bearing etc. on the lubrication port side is worn and affects the lubrication system. Can. In addition, when the "early start abnormality" extends to all the flow detectors, for example, it is possible to know the lubricating oil abnormality such as the viscosity of the lubricating oil being too low. Further, in the case of "late start abnormality" in which the valve body of the flow detector starts to open later than the appropriate opening start time, it is possible to know the abnormality, for example, assuming that the load of the oil supply piping is increasing. Furthermore, when the valve elements of all the flow detectors start to open later than the appropriate opening start time, for example, it is possible to know the main piping abnormality such as breakage of the main piping or a large amount of air mixing into the main piping. . As a result, various abnormalities can be accurately determined, and the reliability of abnormality detection can be improved. Also, it becomes possible to know the type of abnormality and to take appropriate measures.

And, if necessary, the abnormality judging means judges that "all early start abnormality" when all the flow detectors are "early start abnormality" and "all late start abnormality" when "late start abnormality". It has a function to judge.
As a result, the type of abnormality can be identified and known, and a more appropriate countermeasure can be taken. For example, in the case of "all premature start abnormality" in which the valve elements of all the flow detectors start to open earlier than the appropriate opening start time, it is possible to know lubricating oil abnormalities such as the viscosity of the lubricating oil is too low. In the case of "all late start abnormality" in which the valve elements of all the flow detectors start to open later than the appropriate opening start time, for example, the main piping may be damaged or a large amount of air may be mixed We can know piping abnormalities.

In addition, as necessary, the management unit is an operation time recognition unit that recognizes an operation time from start to stop of the lubrication pump, the opening / closing detection unit, and the operation time recognition unit for each flow detector. The apparatus further comprises: open failure detection notification means for notifying that the opening of the valve body is not detected even when the recognized operation time has passed, and the abnormality determination unit includes the open failure detection notification means for each of the flow detectors. When notified that the opening of the valve body is not detected, it is configured to have a function of judging "incompetent abnormality". As a result, when it is determined that "incompetent abnormality" is present, for example, an abnormality such as a valve or oil supply piping blockage can be known. Therefore, it becomes possible to further identify and know the type of abnormality, and it becomes possible to take an even more appropriate countermeasure.

In this case, for each flow detector, the management unit notifies that the open / close detection unit does not detect the closing of the valve body even if the operation time recognized by the operation time recognition unit is over. A detection notification means is provided, and the abnormality judgment means has a function of judging “non-closing abnormality” when the closing / non-detection notifying means notifies that the closing of the valve body is not detected for each flow detector. It is effective. Thereby, when it is determined that "closed abnormality" is present, for example, it is possible to know an abnormality of the flow detector itself. It becomes possible to further identify and know the type of abnormality and to be able to take more appropriate measures.

Furthermore, as necessary, the management unit is an operation time recognition unit that recognizes an operation time from start to stop of the lubrication pump, and each flow detector within the operation time from start to stop of the lubrication pump. The number of opening and closing counting means for counting the number of opening and closing of the valve body by the opening and closing detection means, and the number of times of opening and closing of the appropriate valve body for each flow detector within the operation time from start to stop of the lubrication pump. Means for storing the appropriate number of opening and closing times storing means, and for each flow detector, the number of opening and closing times counted by the means for counting the number of opening and closing times And the abnormality judging means judges that the abnormality is caused when the opening / closing number judgment means judges that at least one of the flow detectors is out of the range. It has a configuration which includes a. For example, if the number is larger than the appropriate switching frequency range, it is possible to know an abnormality such as an increase in fueling load.

In this case, if necessary, the opening / closing number determining means determines whether the opening / closing number is smaller than the minimum value of the appropriate number range stored by the appropriate opening / closing number storage means, or more than the maximum value of the appropriate number range. Has a function to determine whether or not large,
The abnormality determining means determines that the number of opening and closing times is larger than the maximum value when the number of opening and closing times determination means determines that the number of opening and closing times is smaller than the minimum value for each flow detector. It has a function to distinguish and judge each time as "abnormality many times".
This also makes it possible to further identify and know the type of abnormality, and to take more appropriate measures.

As described above, according to the present invention, it is determined whether the open start time of the valve body is within or not within the proper open start time range that is correlated with the temperature of the lubricating oil. The length of the start time makes it possible to determine the malfunction of the lubrication system. If it is determined that the open start time of the valve body is out of the proper open start time range, it can be determined that the lubrication system has some trouble. Therefore, based on the open / close detection of the valve body, it is possible to judge the abnormality accurately as many as possible, and the reliability of management can be improved.

It is a figure which applied an abnormality detection device of a lubrication system concerning an embodiment of the invention to a lubrication system. It is a figure which shows the principal part of the lubrication system to which the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention is applied. It is a perspective view which shows the example of attachment to the lubrication location of the flow detector used with the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is sectional drawing which shows the flow detector used with the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is sectional drawing which shows the example of attachment to the lubrication location of the flow detector used with the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the management part of the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is another block diagram which shows the structure of the management part of the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is a graph which shows an example of correlation with the temperature of lubricating oil and the appropriate opening start time range of a valve body in the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention. It is a flowchart which shows the processing flow of the management part in the abnormality detection apparatus of the lubrication system concerning embodiment of this invention. It is a flowchart which shows the processing flow of the management part in the abnormality detection apparatus of the lubrication system concerning embodiment of this invention. It is a flowchart which shows the processing flow of the management part in the abnormality detection apparatus of the lubrication system concerning embodiment of this invention. It is a flowchart which shows the processing flow of the management part in the abnormality detection apparatus of the lubrication system concerning embodiment of this invention. It is a figure which shows the structural example of the injection molding machine to which the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention is applied. It is sectional drawing which shows an example of the flow detector which exists conventionally.

Hereinafter, an abnormality detection device for a lubrication system according to an embodiment of the present invention will be described based on the attached drawings.
The abnormality detection device K of the lubrication system according to the embodiment shown in FIGS. 1 to 7 is applied as a lubrication system J mounted on the above-described injection molding machine M.

The injection molding machine M includes an injection unit 2 and a mold clamping unit 3 provided on a machine base 1 as shown in FIG. The injection unit 2 includes an injection cylinder 6 which heats and melts the resin from the hopper 4 and injects the mold 5 of the mold clamping unit 3 with a screw (not shown). The injection unit 2 includes an injection drive unit 7 provided with a rotation mechanism for rotationally driving a screw in the injection cylinder 6 and a ball screw mechanism B for moving the screw back and forth, and a front and back provided with a ball screw mechanism B for moving the injection cylinder 6 back and forth A dynamic drive unit 8 is provided. On the other hand, the mold clamping unit 3 includes a fixed board 10 fixed on the machine base 1 and supporting the fixed mold 5a, a movable board 11 supporting the movable mold 5b axially movable with respect to the fixed board 10, and movable A toggle mechanism T provided between the platen 11 and the rear side platen 12 for driving the movable platen 11 in the mold closing direction or the mold opening direction, and a drive unit 13 provided with a ball screw mechanism B for driving the toggle mechanism T It is configured to be equipped.

Then, as shown in FIG. 3 and FIG. 5, the lubricating system J supplies lubricating oil such as grease and oil to the required lubricating point L. The lubrication point L is supplied with lubricating oil through a hole-like lubrication port P formed in a mechanical member provided with the lubrication point L. The lubrication point L includes a rotating portion including the shaft 15 and the bearing 16 of the toggle mechanism T, a screw shaft of the ball screw mechanism B, and a meshing portion (not shown) including a nut meshed with the screw shaft via a ball. Provided in In the toggle mechanism T, the lubrication port P is formed in the housing 17 as a mechanical member covering the bearing 16 and in the ball screw mechanism B, it is formed in a nut. In FIGS. 3 and 5, the lubrication point L indicates a rotating portion consisting of the shaft 15 and the bearing 16 of the toggle mechanism T, and from the nut meshed with the screw shaft and the screw shaft of the ball screw mechanism B via a ball. The illustration of the meshing portion is omitted.

As shown in FIGS. 1, 2 and 13, the lubrication system J includes, for example, a lubrication pump 20 for supplying a lubricating oil, and a plurality of metering valves V (operated by pressurizing and depressurizing the lubricating oil) V1 to Vn) are attached to the junction 21, and the main piping 22 for feeding the lubricating oil from the lubrication pump 20 is connected to the junction 21. In addition, a lubrication port P in the form of a hole is formed in the mechanical member provided with the lubrication point L, the oil supply piping 23 leading to the lubrication port P is connected to each metering valve V, and the lubricating oil discharged from each metering valve V is It supplies intermittently to the lubrication point L. For example, the lubrication port P of the toggle mechanism T is formed in a housing that holds the bearing, and the lubrication port P of the ball screw mechanism B is formed in a nut.

Several types of flow rates per shot of the metering valve V are prepared, for example, in the range of 0.005 cc to 1 cc, and one or more types are selected from these in accordance with the lubrication point L and piping is performed. The lubrication pump 20 is driven and controlled by a management unit 60 described later. The intermittent time of the lubrication pump 20 is set to a required time, and for example, the intermittent time is set by a timer provided in the management unit 60. Further, the operating time of the lubricating pump 20 is also set to an appropriate time at which the full metering valve V can operate, and for example, the operating time is set by a timer.

The abnormality detection device K is provided for each of the metering valves V (Vn1 to Vn), and detects whether or not the lubricating oil is reliably supplied from the corresponding metering valve V to the lubrication point L. SM1 to SMn). As shown in FIGS. 1 to 5, the flow detector 30 is attached to a hole-like lubrication port P via an adapter 31. More specifically, as shown in FIG. 4, the flow detector 30 includes a main body 32 having a fluid space E having a cylindrical inner surface through which lubricating oil can pass. A lubricating oil supply port 34 having a supply opening 33 centered on the central axis of the fluid space E is formed in one end of the fluid space E in the main body 32, and the main body 32 communicates with the fluid space E A lubricating oil discharge port 36 is formed which has a discharge opening 35 and is connected to the flow path of the adapter 31. Furthermore, the main body 32 is provided with one electrode Da made of a conductor having a contact portion 37 exposed to one end side of the fluid space E, and has an exposed portion 38 exposed to the other end side of the fluid space E The other electrode Db which consists of a conductor insulated with respect to one electrode Da is provided. The main body 32 is provided with a bush 39 made of a conductor such as metal forming the supply opening 33, and the bush 39 and / or the periphery thereof is a contact portion 37 exposed to one end side of the fluid space E Is configured as.

Further, in the fluid space E, it is moved along the central axis of the fluid space E and is in contact with the contact portion 37 of the electrode Da to close the supply opening 33 and separate from the contact portion 37 A valve body 40 made of a conductor to be opened is accommodated. Also, in the fluid space E, one end is connected to the valve body 40, and the other end is connected to the exposed portion 38 of the other electrode Db to constantly bias the valve body 40 toward the supply opening 33. The coil spring 41 is housed. Further, the flow detector 30 is provided with a guide member 42 made of an insulator such as a resin provided in the fluid space E and attached to the valve body 40. The guide member 42 secures a flow path of lubricating oil from the supply opening 33 to the discharge opening 35 to form a cylindrical inner surface of the fluid space E in a slidable manner, and faces one end face of the fluid space E It has a receiving surface 43 for receiving lubricating oil from the supply opening 33 and has a top surface 44 facing the other end surface of the fluid space E.

Thus, the flow detector 30 is connected and opened when the valve body 40 is closed in an electric circuit configured of the one electrode Da, the valve body 40, the coil spring 41, and the other electrode Db. The detection of the flow of the lubricating oil can be detected by electrically detecting the disconnection of the. The flow detector 30 is connected to the lubrication port P via the adapter 31. Specifically, a female screw 45 is formed at the discharge port 36 of the flow detector 30, and a female screw 46 is also formed at the lubrication port P. The adapter 31 has a flow passage at its center, and an axial shaft An external thread 47 is formed on one side in the direction to be engaged with the internal thread 44 of the discharge port 36, and an external thread 48 to be engaged on the internal thread 46 on the lubrication port P is formed on the other side in the axial direction. Thus, the adapter 31 lubricates the flow detector 30 by screwing the male screw 47 on one side to the discharge port 36 and screwing the male screw 48 on the other side to the female screw 46 on the lubrication port P. It is attached to location L.

The abnormality detection device K further includes a temperature sensor S that detects the temperature of the lubricating oil as the lubricating oil. As the temperature sensor S, for example, a known sensor of a type in which the output voltage rises with temperature is used. As shown in FIG. 1, the temperature sensor S detects the temperature of the lubricating oil in the tank 20 a of the lubricating pump 20.

Further, as shown in FIG. 1, FIG. 6 and FIG. 7, the abnormality detection device K has a management unit 60 that manages the abnormality of the lubrication system J based on detection signals from the flow detector 30 and the temperature sensor S. Have. The management unit 60 is realized by the function of a CPU or the like, and as shown in FIGS. 6 and 7, the start / stop recognition means 61 for recognizing the start and stop of the lubrication pump 20, and the valve body 40 of each flow detector 30. The open start time from when the open / close detection means 62 for detecting open and close and the start / stop recognition means 61 of each flow detector 30 recognize the start until the open / close detection means 62 detects the opening of the valve body 40 Open start time calculation means 63 to calculate, correlation storage means 64 for storing the correlation between the temperature of the lubricating oil of each flow detector 30 and the appropriate proper open start time range of the valve body 40, and each flow detector Proper opening start time range deriving means 65 which is stored in the correlation storage means 64 and derives the proper opening start time range at the corresponding temperature from the temperature detected by the temperature sensor S of 30, and the opening start time of each flow detector 30 Calculation means 63 The open start time determining means 66 for determining whether the calculated open start time is within the appropriate open start time range or outside the range derived by the appropriate open start time range deriving means 65, and at least one of the open start time determining means 66 An abnormality determining means 67 is provided which determines that the flow detector 30 is abnormal when it is determined that the flow detector 30 is out of range.

In the management unit 60, a voltage is always applied to the electric circuit composed of the one electrode Da, the valve body 40, the coil spring 41 and the other electrode Db of the flow detector 30, and the open / close detection means 62 Detect the electrical connection when it is closed and the electrical disconnection when it is open.

The correlation between the temperature of the lubricating oil of each flow detector 30 and the appropriate proper opening start time range of the valve 40 stored in the correlation storage means 64 is, for example, the type of lubricating oil, the discharge amount of the metering valve V, etc. Therefore, the test is performed in advance for each lubrication point L and determined. An example is shown in FIG. For the temperature change, the minimum value and the maximum value of the appropriate opening start time range are obtained.

Specifically, the open start time determining unit 66 determines whether the open start time is smaller than the minimum value of the appropriate open start time range derived by the appropriate open start time range deriving unit 65, or the maximum of the appropriate open start time range. It has a function to determine whether it is larger than the value. When the open start time determination means 66 of each flow detector 30 determines that the open start time is smaller than the minimum value, the abnormality determination means 67 determines "early start abnormality", and the open start time is maximum value. When it is determined to be larger, it has a function to distinguish and determine as "late start abnormality".

Further, the abnormality judging means 67 judges that "all early start abnormality" when all of the flow detectors 30 are "early start abnormality", and "all delayed start" when all the flow detectors 30 are "late start abnormality" It has a function to judge "abnormal".

Furthermore, the operation time recognition means 70 that recognizes the operation time from start to stop of the lubrication pump 20 by the management unit 60 and the operation time that the open / close detection means 62 of each flow detector 30 recognizes. If the opening of the valve body 40 is not detected even if the time has passed, the operating time recognized by the operating time recognizing means 70 has passed because the open / fail detection notifying means 71 for notifying this and the open / close detection means 62 of each flow detector 30 Even when the closing of the valve body 40 is not detected, the closing / not-detecting means 72 for notifying this is provided.

The abnormality judging means 67 has a function of judging "incompetent abnormality" when the opening / undetecting notifying means 71 of each flow detector 30 notifies that the opening of the valve body 40 is not detected, and When the closing / non-detection notification means 72 of the flow detector 30 notifies that the closing of the valve body 40 is not detected, it has a function of judging as "non-closing abnormality".

Furthermore, the management unit 60 counts the number of times of opening / closing of the valve body 40 by the opening / closing detection means 62 of each flow detector 30 within the operation time from start to stop of the lubrication pump 20 recognized by the operation time recognition means 70. Opening and closing number counting means 73, appropriate opening and closing times storage means 74 for storing the number of opening and closing of valve body 40 of each flow detector 30 within the operation time from start to stop of lubrication pump 20, and each flow detector The number of open / close times counted by the open / close frequency counting means 73 of 30 is provided with the number of open / close times determination means 75 for determining whether it is within the proper open / close frequency range stored in the proper open / close frequency storage means 74.

The number of times of opening and closing of the appropriate valve body 40 of each flow detector 30 stored in the appropriate number of times of opening and closing storage means 74 differs depending on the type of lubricating oil, the discharge amount of the metering valve V, etc. A test is conducted for each location L and determined. The minimum value and the maximum value of the number of times of opening and closing of the appropriate valve body 40 are obtained.

The abnormality judging means 67 has a function of judging as abnormal when the opening / closing number judgment means 75 judges that the at least one flow detector 30 is out of the range. Specifically, the open / close frequency determination unit 75 determines whether the open / close frequency is smaller than the minimum value of the appropriate frequency range stored by the appropriate open / close frequency storage unit 74 or is larger than the maximum value of the appropriate frequency range. Have the ability to The abnormality determining unit 67 determines that the number of opening and closing operations is smaller than the minimum value when the number of opening and closing operations determining unit 75 of each flow detector 30 determines that the number of opening and closing operations is smaller than the minimum value. There is a function to distinguish and judge each as “number of times abnormal”.

Further, as shown in FIG. 7, the abnormality detection apparatus K includes display means 80 for displaying the contents of the abnormality corresponding to the determination result determined by the abnormality determination means 67. For example, the display means 80 displays a screen Can be equipped with a monitor that The contents displayed by the display means 80 are “normal”, “early start abnormality”, “late start abnormality”, “all early start abnormality”, “all late start abnormality”, “invisible abnormality” as shown in FIG. , "Closed error", "low frequency error", "high frequency error". The display is performed for each number of the flow detectors 30 (SM1 to SMn). In addition, when it is determined that there is an abnormality, for example, the driving of the injection unit 2 and the mold clamping unit 3 can be stopped, or the alarm lamp can be turned on or the alarm can be sounded. Furthermore, as described above, the management unit 60 has a function to control the operation of the lubrication pump 20 of the lubrication system J.

Therefore, in the injection molding machine M, the injection unit 2 and the mold clamping unit 3 are driven to perform injection molding. During operation of the injection molding machine M, control of the abnormality detection device K and the management unit 60 thereof is performed. As a result, the lubrication pump 20 of the lubrication system J operates. The process performed by the management unit 60 will be described using the flowcharts shown in FIGS. 9 to 12.

As shown in FIG. 9, the temperature sensor S performs temperature detection (S101), and in the management unit 60, the appropriate opening start time range deriving means 65 controls the temperature sensor S for each of the flow detectors 30 (SM1 to SMn). Based on the correlation data stored in the correlation storage means 64 from the detected temperature of the lubricating oil, the appropriate opening start time range at the detected temperature is derived (S102). The proper opening start time range deriving means 65 successively updates and stores the proper opening start time range.

And if predetermined time of intermittent time comes (S103 Yes), while lubricating pump 20 is driven, a timer will operate (S104). As a result, the lubricating oil is discharged from each metering valve V, and the lubricating oil is supplied to the lubrication point L through the flow detector 30. In the flow detector 30, the lubricating oil acts on the valve body 40 in the main body 32, the valve body 40 is opened, and the lubricating oil flows into the fluid space E from the supply opening 33 and is discharged from the discharge opening 35. , The valve body 40 returns and closes the supply opening 33. This opening / closing operation differs for each flow detector 30.

In the management unit 60, the open / close detection means 62 first detects the opening of the valve body 40 of the flow detector 30 (S105). In this case, when the opening is not detected (No in S105), the opening / closing number counted by the opening / closing number counting means 73 is zero initially (S106 Yes), so the opening of the valve 40 is detected until the timer time arrives (S107 No → S105). If the opening of the valve 40 is not detected even if the timer time has come (S107 Yes), after the pump is stopped (S108), the open failure detection notifying means 71 recognizes the open / close detection means 62 recognizes the operating time recognition means 70 It is notified that the opening of the valve body 40 is not detected even if the operating time has passed. Accordingly, the abnormality determining unit 67 determines that the abnormality is "incompetent abnormality" (S109), and displays it on the display unit 80. On the other hand, when the opening of the valve body 40 is detected within the timer time (S105 Yes), it is determined whether or not the opening is the first (S110). When it is the first opening (S110 Yes), the process proceeds to the next (a).

Next, description will be made with reference to the flowchart shown in FIG. The open start time calculation means 63 calculates, for each flow detector 30, an open start time from when the start / stop recognition means 61 recognizes the start to when the open / close detection means 62 detects the opening of the valve 40 (S201 ). Then, the open start time calculated by the open start time calculation unit 63 of each flow detector 30 is within the appropriate open start time range derived by the appropriate open start time range derivation unit 65 or outside the open start time determination unit 66. It is determined whether or not (S202). When the open start time judging means 66 judges that the open start time is out of the proper open start time range (S202 No), subsequently, the open start time is the minimum of the proper open start time range derived by the proper open start time range deriving means 65 It is determined whether it is smaller than the value or larger than the maximum value of the appropriate opening start time range (S203). Here, when the open start time determination unit 66 determines that the open start time is smaller than the minimum value (S203 Yes), the abnormality determination unit 67 determines that "early start abnormality" (S204), and the open start time determination unit When it is determined that the open start time is larger than the maximum value 66 (S203 No), the abnormality determination unit 67 determines that "late start abnormality" (S205). On the other hand, when the open start time determining means 66 determines that the open start time is within the appropriate open start time range (S202 Yes), the process proceeds to the next (b).

Next, description will be made with reference to the flowchart shown in FIG. In the management unit 60, the open / close detection means 62 detects that the valve 40 is closed after it is opened (S301), and continues to detect the closing of the valve 40 until the timer time arrives (S302 No → S301). If the closing of the valve 40 is not detected even if the timer time has arrived (S302 Yes), the pump is stopped after the pump is stopped (S303), the closed / undetected notifying unit 72 recognizes the open / close detecting unit 62 recognizes the operating time recognizing unit 70 It is notified that the closing of the valve 40 is not detected even if the operating time has passed, to the abnormality determining unit 67 as "closed abnormality" (S304), and is displayed on the display unit 80.

On the other hand, when the closing of the valve body 40 is detected within the timer time (S301 Yes), the opening / closing number counting means 73 counts and integrates the number of opening / closing of the valve body 40 by the opening / closing detection means 62 once (S305). Then, the opening and closing of the valve body 40 is detected as described above until the timer time arrives (S306 No → c → S105 Yes → S110 No → b → S301 Yes → S305 → S306). If there is a problem in this process, as described above, it is determined as "incompetent abnormality" (S109) or "incompetent abnormality" (S304).

When the timer time has elapsed (S306 Yes), the pump is stopped (S307). Then, the number of opening and closing of the valve body 40 counted by the number of opening and closing counting means 73 is determined (S308), and the number of opening and closing times counted by the opening and closing number counting means 73 of each flow detector 30 is appropriate. It is determined whether it is within the appropriate switching frequency range or outside the range stored in the frequency storage means 74 (S309). If the open / close frequency determining means 75 determines that the open / close frequency range is not within the proper open frequency range (S309 No), the open / close frequency determination means 75 determines whether the open frequency is smaller than the minimum value of the appropriate frequency range stored in the proper open frequency range. It is determined whether it is larger than the maximum value of (S310). When the abnormality judging means 67 judges that the opening / closing times judging means 75 of each flow detector 30 count the opening / closing times counted by the opening / closing times counting means 73 smaller than the minimum value (S310 Yes) (S311), when it is determined that the number of times of opening and closing is larger than the maximum value (No in S310), it is determined that "abnormal number of times" (S312). The abnormality determining unit 67 displays “abnormal for a small number of times” and “abnormal for a large number of times” on the display unit 80. On the other hand, when the open / close frequency determination means 75 determines that the open / close frequency range is within the proper open / close frequency range (S309 Yes), the process proceeds to the next (f).

Next, description will be made with reference to the flowchart shown in FIG. The abnormality judging means 67 judges whether or not there is "early start abnormality" by the abnormality judging means 67 in all the flow detectors 30 (S401), and whether "late start abnormality" exists (S402). If there is no abnormality (S401 No, S402 No), it is judged as "normal" (S403), and this is displayed on the display means 80. On the other hand, when the abnormality judgment means 67 judges "early start abnormality" (S401 Yes), it is judged whether or not all of the flow detectors 30 are present (S404), and all of the flow detectors 30 If it is the start abnormality (S404 Yes), it is determined that "all early start abnormality" (S405). Further, when not all (S404 No), "premature start abnormality" is displayed on the display means 80 for each number of the flow detectors 30 (SM1 to SMn) as individual abnormality (S406).

Further, when there is a "late start abnormality" by the abnormality judging means 67 (S402 Yes), it is judged whether or not it is in all the flow detectors 30 (S407), and all the flow detectors 30 are "slow start abnormality" In the case of (S407 Yes), it is determined that "all late start abnormality" (S408). Further, when not all (S407 No), as the individual abnormality (S409), the display means 80 displays "late start abnormality" for each number of the flow detectors 30 (SM1 to SMn).

As shown in FIG. 7, in the display means 80, "normal", "early start abnormality", "slow start abnormality", "all early start abnormality", "all late start abnormality", "invisible abnormality", " One of “closed error”, “small number of errors”, and “many times abnormal” is displayed. Further, in any case, if there is an abnormality, in addition to the display, for example, the driving of the injection unit 2 and the mold clamping unit 3 can be stopped, or the alarm lamp can be turned on or the alarm can be sounded.

Thereby, in the case of "early start abnormality" in which the valve body 40 of the flow detector 30 starts to open earlier than the appropriate opening start time, for example, the slide bearing etc. on the lubrication port P side is worn and affects the lubrication system J Know what you are doing. In addition, when the “early start abnormality” reaches all the flow detectors 30, it is possible to know, for example, a lubricating oil abnormality such as the viscosity of the lubricating oil being too low. Further, in the case of “late start abnormality” in which the valve body 40 of the flow detector 30 starts to open later than the appropriate opening start time, for example, it is possible to know the abnormality, assuming that the load of the oil supply piping 23 is increasing. . Furthermore, when the valve body 40 of all the flow detectors 30 starts to open later than the appropriate opening start time, for example, to know the main piping abnormality such as breakage of the main piping 22 or a large amount of air mixing into the piping. Can. As a result, it is possible to judge the abnormality over a wide range, to be able to accurately judge the abnormality, and to improve the reliability of the abnormality detection. Also, it becomes possible to know the type of abnormality and to take appropriate measures.

Also, in the case of "all-early start abnormality" in which the valve elements 40 of all the flow detectors 30 start to open earlier than the appropriate opening start time, for example, know the lubricating oil abnormality such as the viscosity of the lubricating oil is too low. Can. Further, in the case of "all late start abnormality" in which the valve bodies 40 of all the flow detectors 30 start to open later than the appropriate opening start time, for example, breakage of the main pipe 22, large amount of air mixing in the pipe, etc. You can know the abnormality of For this reason, it becomes possible to identify and know the type of abnormality, and it becomes possible to take more appropriate measures.

Furthermore, in the case of “incomplete abnormality”, for example, an abnormality such as clogging of the valve V or the oil supply piping 23 can be known. Therefore, it becomes possible to further identify and know the type of abnormality, and it becomes possible to take an even more appropriate countermeasure. Furthermore, in the case of “closed abnormality”, for example, it is possible to know an abnormality of the flow detector 30 itself. It becomes possible to further identify and know the type of abnormality, and in this respect as well, it is possible to take an even more appropriate countermeasure. In addition, it is possible to know "abnormal for a few times" and "abnormal for many times". For example, in the case of "multiple-time abnormality", it is possible to know an increase in refueling load. It becomes possible to further identify and know the type of abnormality and to be able to take more appropriate measures.

In the above embodiment, the temperature sensor S is provided to detect the temperature of the lubricating oil in the tank 20a of the lubricating pump 20. However, the present invention is not necessarily limited to this. If there is a correlation with time, it may be attached to the flow detector 30, and it may be changed as appropriate. Further, the lubrication point L is not limited to the above-described part, and may of course be provided at any part. In summary, those skilled in the art can easily make many modifications to these illustrated embodiments without substantially departing from the novel teachings and advantages of the present invention, and many of these modifications are within the scope of the present invention. It is included in the range.

Although several embodiments and / or examples of the present invention have been described in detail, those skilled in the art will appreciate that the exemplary embodiments and / or examples are substantially without departing from the novel teachings and advantages of the present invention. It is easy to make many changes to Accordingly, many of these variations are included within the scope of the present invention.

K abnormality detection device M injection molding machine J lubrication system B ball screw mechanism T toggle mechanism L lubrication location P lubrication port 20 lubrication pump 20a tank 21 junction 22 main piping 23 lubrication piping V metering valve 30 flow detector 31 adapter E fluid space 32 main body 33 Supply opening 34 Supply opening 35 Discharge opening 36 Discharge opening 37 Contact part 38 Exposure part Da One electrode Db Other electrode 39 Bush 40 Valve body 41 Coil spring 42 Guide member S Temperature sensor 60 Management part 61 Start stop recognition means 62 Open / close detection means 63 Open start time calculation means 64 Correlation storage means 65 Proper open start time range derivation means 66 Open start time judgment means 67 Abnormality judgment means 70 Operating time recognition means 71 Open failure detection notification means 72 Closed not detection notification means 73 Counting the number of times of opening and closing Means 74 appropriate number of times of switching storage means 7 5 open / close frequency determination means 80 display means

Claims

The lubrication pump is started and stopped to supply lubricating oil from the lubricating pump to the main pipe at the time of starting, and lubrication is intermittently supplied to the lubricating port from the plurality of metering valves connected to the main pipe through the oil supply pipe. In the anomaly detection device provided in the system,
A flow detector provided in each of the lubrication ports and detecting the flow of lubricating oil by opening and closing of an internal valve body, a temperature sensor for detecting the temperature of the lubricating oil, opening and closing of valve bodies of the respective flow detectors And a management unit that performs abnormality management of the lubrication system based on the temperature detected by the temperature sensor.
The management unit includes start / stop recognition means for recognizing start and stop of the lubricating pump, open / close detection means for detecting opening and closing of the valve body of each flow detector, and the start for each flow detector. Opening start time calculation means for calculating an open start time until the open / close detection means detects opening of the valve body after the stop recognition means recognizes start, and for each of the flow detectors, the temperature of the lubricating oil and Correlation stored in the correlation storage means from the correlation storage means for storing the correlation with the appropriate proper opening start time range of the valve body and the temperature detected by the temperature sensor in each of the flow detectors The appropriate opening start time range deriving means for deriving the appropriate opening start time range based on the data, and the opening start time calculated by the opening start time calculating means for each of the flow detectors is the appropriate opening start time range deriving means Derived Open start time judging means for judging whether it is within the normal open start time range or out of the range; abnormality judging means for judging as abnormal when the open start time judging means judges that at least one flow detector is out of range; An abnormality detection device for a lubrication system, comprising:
The open start time determining means determines whether the open start time is smaller than the minimum value of the appropriate open start time range derived by the appropriate open start time range deriving means, or the maximum value of the appropriate open start time range Has the ability to determine if it is greater than
When the open start time determination unit determines that the open start time is smaller than the minimum value for each flow detector, the abnormality determination unit determines "early start abnormality", and the open start time determination unit determines the open start time determination unit. The abnormality detection device for a lubrication system according to claim 1, further comprising a function for discriminating as "late start abnormality" when judging that the open start time is larger than the maximum value.
The abnormality judging means judges "all early start abnormality" when all the flow detectors are "early start abnormality", and judges "all late start abnormality" when all the flow detectors are "late start abnormality" The abnormality detection device for a lubrication system according to claim 2, characterized in that
The management unit is an operation time recognition means for recognizing an operation time from start to stop of the lubricating pump, and for each flow detector, the operation time recognized by the open / close detection means and the operation time recognition means has passed Even if the valve does not detect the opening of the valve, it has open failure detection notification means, and the abnormality judgment unit does not detect the opening of the valve flow for each flow detector. 4. The abnormality detection device for a lubrication system according to claim 1, further comprising a function of judging “incompetent abnormality” when having notified that.
The management unit is, for each of the flow detectors, closed / not detected notification means for notifying that the open / close detection means does not detect the closing of the valve even if the operation time recognized by the operation time recognition means has passed. The abnormality judging means is characterized by having a function of judging “non-closing abnormality” when the closing / not-detecting notifying means notifies that the closing of the valve body is not detected for each of the flow detectors. The abnormality detection device for a lubrication system according to claim 4.
The management unit is an operation time recognition unit that recognizes an operation time from start to stop of the lubrication pump, and the open / close detection unit for each flow detector within the operation time from start to stop of the lubrication pump And counting means for counting the number of times of opening and closing of the valve body, and the appropriate number of times of opening and closing memory for storing the number of times of opening and closing of the valve body properly for each flow detector within the operation time from start to stop of the lubricating pump Means, and an opening / closing number judgment means for judging whether the number of opening / closing times counted by the opening / closing number counting means is within the appropriate opening / closing frequency range or outside the range stored in the appropriate number of opening / closing times storage means The abnormality judging means has a function of judging as abnormal when the opening / closing number judgment means judges that at least one flow detector is out of the range. Abnormality detecting device of the lubrication system according to any one of claims 1 to 5, characterized in.
The opening / closing number determining means determines whether the opening / closing number is smaller than the minimum value of the appropriate number range stored in the appropriate opening / closing number storage means, or whether the number is larger than the maximum value of the appropriate number range. Equipped with
The abnormality judging means judges that the opening / closing number judgment means "abnormal" when the opening / closing number is smaller than the minimum value for each flow detector, and "many times when the opening / closing number is larger than the maximum value. 7. The abnormality detection device for a lubrication system according to claim 6, further comprising a function of judging “abnormal” and discriminating and judging each.