JP6863588B2 - Lubrication system abnormality detector - Google Patents

Description

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

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

Then, in this injection molding machine M, lubricating oil such as grease or oil is supplied to the required lubrication points L by the lubrication system J. Lubrication points L are provided at various places such as a rotating portion formed of a shaft and a bearing of the toggle mechanism T, a screw shaft of the ball screw mechanism B, and a meshing 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 lubricating oil, and a plurality of metering valves V operated by pressurizing and depressurizing the lubricating oil are attached to the junction 21. A main pipe 22 for supplying lubricating oil from the lubrication pump 20 is connected to the junction 21, a hole-shaped lubrication port P is formed in a mechanical member provided with a lubrication point L, and each metering valve V is connected to the lubrication port P. The lubrication pipes 23 are connected to each other, and the lubricating oil discharged from each metering valve V is intermittently supplied to the lubrication points L. For example, the lubrication port P of the toggle mechanism T is formed in the housing including the bearing, and the lubrication port P of the ball screw mechanism B is formed in the nut. For example, the flow rate per shot of the metering valve V is prepared in the range of 0.005 cc to 1 cc, and one or a plurality of types are selected from these according to the lubrication point L and piped.

The lubrication system J is provided with an abnormality detection device for detecting an abnormality in the lubrication system, and safety is ensured by checking whether or not the lubricating oil is normally supplied. As the abnormality detection device, for example, a flow detector as published in Japanese Patent Application Laid-Open 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 the main body 100 includes a fluid at 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 space E is formed, and a lubricating oil discharge port 104 having a discharge opening 103 communicating with the fluid space E is formed on a side portion of the main body 100. The forming member of the supply opening 101 forming the supply opening 101 is configured as a one-sided electrode 105 made of a conductor, and the main body 100 has an exposed portion 106 exposed on the other end side of the fluid space E and the one-sided electrode 105. On the other hand, an electrode 107 made of an insulated conductor is provided, and the electrode 107 is moved in the fluid space E along the central axis P of the fluid space E and abuts on the opening edge 108 of the supply opening 101 to form the supply opening 101. A valve body 110 made of a conductor that opens the supply opening 101 away from the supply opening 101 while being closed is housed, and one end is connected to the valve body 110 and the other end is an electrode in the fluid space E. It is configured by accommodating a coil spring 111 made of a conductor that is connected to the exposed portion 106 of 107 and constantly urges the valve body 110 in the direction of closing the supply opening 101. Further, the valve body 110 is slidably inserted into the other electrode 107 with the tip portion 112 protruding from the axis along the central axis P of the fluid space E, and one end side of the coil spring 111 is placed on the base end side. A tubular guide member 114 having a sliding hole 113 to be housed is fixed. The lubricating oil flow detection device Ka constitutes a so-called check valve by opening and closing the valve body 110.

Then, in the abnormality detection device using the flow detection device Ka, for example, the flow detection device Ka is attached to each lubrication port P and the greasing pipe 23 is connected to the lubrication port P. Then, each flow detection device Ka is connected to a management unit (not shown) via a wiring 115 connected to one of the electrodes 105 and a wiring 116 connected to the other electrode 107, and the management unit connects the one electrode 105 and the valve. A voltage is constantly applied to the electric circuit composed of the body 110, the coil spring 111 and the other electrode 107, and the connection when the valve body 110 of this electric circuit is closed and the disconnection when the valve body 110 is opened are electrically performed. When the opening / closing is not detected, it is notified that there is an abnormality.

Jitsukaisho 53-16743

By the way, in the abnormality detection device using the above-mentioned lubricating oil flow detection device Ka, in the lubrication system J, the flow detection device Ka is connected to the lubrication pipe 23 from the metering valve V to the lubrication point L for lubrication. When detecting the flow of oil, even if there is a problem due to, for example, leakage, clogging, or sticking of the lubricating oil in the valve V of the main pipe 22 or the lubrication pipe 23, the lubricating oil may flow slightly. There is a problem that an accurate abnormality cannot be determined because the flow may be excessive and the flow detection device Ka may detect the flow of the lubricating oil and determine that it is normal.

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

In order to achieve such an object, the abnormality detection device of the lubrication system of the present invention starts and stops the lubrication pump, supplies lubricating oil from the lubrication pump to the main pipe at the time of starting, and is connected to the main pipe. In the abnormality detection device of the lubrication system provided in the lubrication system that intermittently supplies lubricating oil from the metering valve to the lubrication port via the lubrication pipe.
A flow detector that detects the flow of lubricating oil by opening and closing the internal valve body provided in each of the lubricating ports, a temperature sensor that detects the temperature of the lubricating oil, opening and closing of the valve body of each of the flow detectors, and the above. It is equipped with a management unit that manages abnormalities of the lubrication system based on the detected temperature of the temperature sensor.
The management unit has a start / stop recognizing means for recognizing the start and stop of the lubrication pump, an open / close detection means for detecting the opening and closing of the valve body of each of the flow detectors, and the start for each of the flow detectors. The opening start time calculating means for calculating the opening start time from the stop recognition means recognizing the start until the opening / closing detecting means detects the opening of the valve body, and the temperature and valve of the lubricating oil for each of the flow detectors. Appropriate and appropriate for the body Correlation storage means that stores the correlation with the opening start time range, and the temperature detected by the temperature sensor for each of the flow detectors is stored in the correlation storage means and is appropriate at the corresponding temperature. The proper opening start time range deriving means for deriving the opening start time range and the proper opening start time calculated by the opening start time calculating means for each of the flow detectors are derived by the proper opening start time range deriving means. A configuration including an opening start time determining means for determining whether it is within or outside the time range, and an abnormality determining means for determining an abnormality when the opening start time determining means determines that at least one of the flow detectors is out of range. It is supposed to be.

As a result, when the lubrication pump of the lubrication system is started and the lubricating oil is supplied to the main pipe, the lubricating oil is supplied to the lubrication port from a plurality of metering valves connected to the main pipe via the lubrication pipe. In response to this, in the flow detector, the lubricating oil acts on the internal valve body to open the valve body, 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 returns and closes. 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 recognizing means recognizes the start and stop of the lubrication pump, and the open / close detecting means detects the opening and closing of the valve body of the flow detector. Further, the opening start time calculating means calculates the opening start time from the start / stop recognizing means recognizing the start to the opening / closing detecting means detecting the opening of the valve body for each flow detector. On the other hand, in the correlation storage means, the correlation between the temperature of the lubricating oil and the proper 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. Is stored in the correlation storage means from the temperature detected by, and the appropriate opening start time range at the corresponding temperature is derived.
Then, the opening start time determining means determines whether the opening start time calculated by the opening start time calculating means is within or outside the appropriate opening start time range derived by the appropriate opening start time range deriving means for each flow detector. When it is judged to be within the range, it is regarded as normal, and when it is judged to be out of the range, the abnormality judgment means is judged to be abnormal.

Therefore, it is determined whether the opening start time of the valve body is within the proper opening start time range that correlates with the temperature of the lubricating oil or is out of the range. You will be able to judge abnormalities. If it is determined that the opening start time of the valve body is out of the proper opening start time range, it can be determined that some trouble has occurred in the lubrication system.

Then, if necessary, whether or not the opening start time determining means is smaller than the minimum value of the proper opening start time range derived by the proper opening start time range deriving means, and the proper opening start. It is configured with a function to judge whether it is larger than the maximum value of the time range.
When the opening start time determining means determines that the opening start time is smaller than the minimum value for each of the flow detectors, the abnormality determining means determines "early start abnormality" and determines the opening start time determining means. When it is determined that the opening start time is larger than the maximum value, it is configured to have a function of distinguishing and determining each as a "late start abnormality".

That is, for example, in the case of "early start abnormality" in which the valve body of the flow detector starts opening earlier than the proper opening start time, for example, the slide bearing on the lubrication port side is worn and affects the lubrication system. You can know. Further, when the "early start abnormality" reaches all the flow detectors, it is possible to know the lubricating oil abnormality such as the viscosity of the lubricating oil being too low. Further, for example, in the case of a "late start abnormality" in which the valve body of the flow detector starts opening later than the proper opening start time, it is possible to know the abnormality, for example, assuming that the load on the greasing pipe is increasing. .. Further, when the valve bodies of all the flow detectors start opening later than the proper opening start time, it is possible to know the main pipe abnormality such as damage to the main pipe or a large amount of air being mixed. .. As a result, it is possible to judge a wide range of abnormalities, and it is possible to judge an abnormality as accurately as possible, and it is possible to improve the reliability of abnormality detection. In addition, it becomes possible to know the type of abnormality and take appropriate measures.

Further, if necessary, the abnormality determination means determines "all early start abnormality" when all the flow detectors are "early start abnormality", and "late start abnormality" when all the flow detectors are "late start abnormality". It is configured to have a function to judge "all late start abnormalities". As a result, it becomes possible to identify and know the type of abnormality, and it becomes possible to take even more appropriate measures. For example, in the case of "all early start abnormality" in which the valve bodies of all the flow detectors start opening earlier than the proper opening start time, it is possible to know the lubricating oil abnormality such as the viscosity of the lubricating oil being too low. .. In addition, in the case of "total late start abnormality" in which the valve bodies of all flow detectors start opening later than the proper opening start time, for example, the main piping is damaged or a large amount of air is mixed in. You can know the piping abnormality.

Further, if necessary, the management unit has an operation time recognizing means for recognizing the operation time from the start to the stop of the lubrication pump, and the opening / closing detecting means for each of the flow detectors has the operation time recognizing means. The opening / non-detection notification means for notifying when the opening of the valve body is not detected even after the recognition operation time has passed is provided, and the above-mentioned abnormality determination means is provided for each of the above-mentioned flow detectors by the above-mentioned opening / non-detection notification means. It is configured to have a function to judge "non-opening abnormality" when notifying that the opening of the valve body is not detected. As a result, when it is determined that the "non-opening abnormality" is made, it is possible to know, for example, an abnormality such as a clogging of a valve or a greasing pipe. Therefore, it becomes possible to further identify and know the type of abnormality, and it becomes possible to take even more appropriate measures.

In this case, the management unit notifies each of the flow detectors when the opening / closing detection means does not detect the closing of the valve body even after the operation time recognized by the operation time recognition means has passed. The abnormality determining means is provided with a notification means, and each of the flow detectors has a function of determining "non-closing abnormality" when the closing / non-detection notifying means notifies that the valve body is not closed. It is effective. As a result, when it is determined that there is an "immobility abnormality", for example, it is possible to know the abnormality of the flow detector itself. It will be possible to further identify and know the type of abnormality, and to take even more appropriate measures.

Further, if necessary, the management unit has an operation time recognition means for recognizing the operation time from the start to the stop of the lubrication pump, and each of the flow detectors within the operation time from the start to the stop of the lubrication pump. The opening / closing number counting means for counting the number of opening / closing times of the valve body by the opening / closing detection means and the appropriate number of opening / closing times of the valve body are stored for each of the flow detectors within the operation time from the start to the stop of the lubrication pump. The appropriate opening / closing number storage means and the opening / closing number determining means for determining whether the opening / closing number counted by the opening / closing number counting means for each of the flow detectors is within or out of the stored appropriate opening / closing number range. The abnormality determining means is provided with a function of determining an abnormality when the opening / closing number of times determining means determines that at least one of the flow detectors is out of range. For example, when the number of times of opening and closing is more than the proper range, it is possible to know an abnormality such as an increase in greasing load.

In this case, if necessary, the opening / closing number determination means is used to determine whether or not the opening / closing number is smaller than the minimum value of the appropriate number range stored by the appropriate opening / closing number storage means and larger than the maximum value of the appropriate opening / closing number range. It is configured with a function to judge whether or not it is.
When the opening / closing number determining means determines that the opening / closing number is smaller than the minimum value for each of the flow detectors, the abnormality determining means determines that the opening / closing number of times is smaller than the minimum value. When it is judged that it is larger than the maximum value, it is configured as having a function to distinguish and judge each as "multiple abnormalities".
This also makes it possible to further identify and know the type of abnormality, and to take even more appropriate measures.

As described above, according to the present invention, it is determined whether the opening start time of the valve body is within or outside the proper opening start time range that correlates with the temperature of the lubricating oil. It becomes possible to judge the abnormality of the lubrication system by the length of the start time. If it is determined that the opening start time of the valve body is out of the proper opening start time range, it can be determined that some trouble has occurred in the lubrication system. Therefore, based on the detection of opening / closing of the valve body, it becomes possible to accurately determine the abnormality in as wide a range as possible, and the reliability of management can be improved.

It is a figure which shows the abnormality detection apparatus of the lubrication system which concerns on embodiment of this invention together with the lubrication system to which this is applied. It is a main part diagram which shows the lubrication system to which the abnormality detection device 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 part of the flow detector used in the abnormality detection device of the lubrication system which concerns on embodiment of this invention. It is sectional drawing which shows the flow detector used in 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 part of the flow detector used in 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 the correlation between the temperature of the lubricating oil, and the proper opening start time range of a valve body in the abnormality detection device 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 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 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 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 which concerns on embodiment of this invention. It is a figure which shows the structural example of the injection molding machine to which the abnormality detection device of the lubrication system which concerns on embodiment of this invention is applied. It is sectional drawing which shows an example of the conventional flow detector.

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

As shown in FIG. 13, the injection molding machine M includes an injection portion 2 and a mold clamping portion 3 provided on the machine base 1. The injection unit 2 includes an injection cylinder 6 that heats and melts the resin from the hopper 4 and injects it into the mold 5 of the mold clamping unit 3 with a screw (not shown). The injection unit 2 is provided with an injection drive unit 7 including a rotation mechanism for rotationally driving the screw in the injection cylinder 6 and a ball screw mechanism B for moving the screw back and forth, and a ball screw mechanism for moving the injection cylinder 6 back and forth. A back-and-forth motion drive unit 8 provided with a B is provided. On the other hand, the mold clamping portion 3 is movable with a fixed plate 10 fixed on the machine base 1 and supporting the fixed mold 5a, and a movable plate 11 supporting the movable mold 5b which is movable in the axial direction with respect to the fixed plate 10. A toggle mechanism T provided between the board 11 and the rear board 12 and driving the movable board 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 are provided. It is configured to prepare.

Then, as shown in FIGS. 3 and 5, the lubrication system J supplies lubricating oil such as grease or oil to the required lubrication points L. Lubricating oil is supplied to the lubrication point L through the hole-shaped lubrication port P formed in the mechanical member provided with the lubrication point L, and the rotating portion including the shaft 15 of the toggle mechanism T and the bearing 16 and the screw shaft of the ball screw mechanism B. It is provided in various places such as a meshing portion (not shown) composed of a nut that meshes with a screw shaft via a ball. 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 the nut. In FIGS. 3 and 5, the lubrication point L indicates a rotating portion including the shaft 15 and the bearing 16 of the toggle mechanism T, and is from a nut meshed with the screw shaft and the screw shaft of the ball screw mechanism B via a ball. The meshing portion is not shown.

As shown in FIGS. 1, 2 and 13, the lubrication system J includes, for example, a lubrication pump 20 for supplying lubricating oil, and a plurality of metering valves V (actuated by pressurizing and depressurizing the lubricating oil). V1 to Vn) are attached to the junction 21, the main pipe 22 for supplying the lubricating oil from the lubrication pump 20 is connected to the junction 21, and a hole-shaped lubrication port P is formed in the mechanical member provided with the lubrication point L. Then, the lubrication pipe 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 intermittently supplied to the lubrication point L. For example, the lubrication port P of the toggle mechanism T is formed in the housing including the bearing, and the lubrication port P of the ball screw mechanism B is formed in the nut.

For example, the flow rate per shot of the metering valve V is prepared in the range of 0.005 cc to 1 cc, and one or a plurality of types are selected from these according to the lubrication point L and piped. 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 lubrication pump 20 is also set to an appropriate time during which the total metering valve V can be operated, and for example, the operating time is set by a timer.

The abnormality detection device K is provided for each metering valve V (Vn1 to Vn), and is a flow detector 30 that detects whether or not lubricating oil is reliably supplied to the lubrication point L from the corresponding metering valve V. (SM1 to SMN). As shown in FIGS. 1 to 5, the flow detector 30 is attached to the hole-shaped lubrication port P via an adapter 31. 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. The main body 32 is formed with a lubricating oil supply port 34 having a supply opening 33 centered on the central axis of the fluid space E at one end of the fluid space E, and the main body 32 communicates with the fluid space E. A lubricating oil discharge port 36 having a discharge opening 35 to be connected to the flow path of the adapter 31 is formed. Further, the main body 32 is provided with one electrode Da made of a conductor having a contact portion 37 exposed on one end side of the fluid space E, and has an exposed portion 38 exposed on the other end side of the fluid space E. On the other hand, the other electrode Db made of a conductor insulated from the electrode Da is provided. The main body 32 includes a bush 39 made of a conductor such as a metal forming a supply opening 33, and the bush 39 and / or its periphery thereof is a contact portion 37 exposed to one end side of the fluid space E, while the electrode Da. It is configured as.

Further, in the fluid space E, the supply opening 33 is moved along the central axis of the fluid space E and abuts on the contact portion 37 of the electrode Da to close the supply opening 33, and the supply opening 33 is separated from the contact portion 37. A valve body 40 made of a conductor to be opened is housed. Further, 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 urge the valve body 40 in the direction of closing the supply opening 33. A coil spring 41 made of the above is housed. Further, the flow detector 30 is provided with a guide member 42 made of an insulator such as a resin, which is attached to the valve body 40 and is provided in the fluid space E. The guide member 42 is formed so as to secure a flow path for lubricating oil from the supply opening 33 to the discharge opening 35 so as to be slidable on the inner surface of the cylinder of the fluid space E, and face one end surface of the fluid space E. It is configured to have a receiving surface 43 that receives the lubricating oil from the supply opening 33 and a top surface 44 that faces the other end surface of the fluid space E.

As a result, the flow detector 30 is connected when the valve body 40 is closed and when the valve body 40 is opened in the electric circuit composed of the one electrode Da, the valve body 40, the coil spring 41 and the other electrode Db. It is configured so that 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 an 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 path at the center thereof and has a shaft. A male screw 47 screwed into the female screw 44 of the discharge port 36 is formed on one side in the direction, and a male screw 48 screwed into the female screw 46 of the lubrication port P is formed on the other side in the axial direction. As a result, the adapter 31 lubricates the flow detector 30 by screwing the male screw 47 on one side into the discharge port 36 and the male screw 48 on the other side into the female screw 46 of the lubrication port P. It is attached to the location L.

Further, the abnormality detection device K 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 well-known type in which the output voltage increases with temperature is used. As shown in FIG. 1, the temperature sensor S detects the temperature of the lubricating oil in the tank 20a of the lubricating pump 20.

Further, as shown in FIGS. 1, 6 and 7, the abnormality detection device K has a management unit 60 that manages the abnormality of the lubrication system J based on the detection signals from the flow detector 30 and the temperature sensor S. I have. The management unit 60 is realized by a function of a CPU or the like, and as shown in FIGS. 6 and 7, the start / stop recognizing 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 / close detecting means 62 for detecting open / closed and the open / close detecting means 62 for each flow detector 30 determine the opening start time from when the start / stop recognizing means 61 recognizes the start until the open / close detecting means 62 detects the opening of the valve body 40. The opening start time calculating means 63 to be calculated, the correlation storage means 64 for storing the correlation between the temperature of the lubricating oil and the proper proper opening start time range of the valve body 40 for each flow detector 30, and each flow detection. The proper opening start time range deriving means 65, which is stored in the correlation storage means 64 from the temperature detected by the temperature sensor S for each device 30 and derives the proper opening start time range at the corresponding temperature, and the opening for each flow detector 30 The opening start time determining means 66 for determining whether the opening start time calculated by the start time calculating means 63 is within or outside the appropriate opening start time range derived by the appropriate opening start time range deriving means 65, and the opening start time determining means 66 At least one of the flow detectors 30 is provided with an abnormality determining means 67 for determining an abnormality when it is determined that the flow detector 30 is out of range.

In the management unit 60, a voltage is constantly applied to an electric circuit composed of one electrode Da, a valve body 40, a coil spring 41 and the other electrode Db of the flow detector 30, and the open / close detection means 62 uses this electric circuit. The connection when the valve body 40 is closed and the disconnection when the valve body 40 is opened are electrically detected.

The correlation between the temperature of the lubricating oil and the proper opening start time range of the valve body 40 for each flow detector 30 stored in the correlation storage means 64 is, for example, the type of lubricating oil and the discharge amount of the metering valve V. Since it differs for each lubrication point due to factors such as the above, a test is performed and determined in advance for each lubrication point L. FIG. 8 shows an example thereof. Find the minimum and maximum values of the proper opening start time range for temperature changes.

Specifically, the opening start time determining means 66 determines whether or not the opening start time is smaller than the minimum value of the appropriate opening start time range derived by the appropriate opening start time range deriving means 65, and the maximum value of the appropriate opening start time range. It is configured with a function to judge whether it is larger or not. When the opening start time determining means 66 determines that the opening start time is smaller than the minimum value for each flow detector 30, the abnormality determining means 67 determines that the opening start time is "early start abnormality", and determines that the opening start time determining means 66. When it is determined that the opening start time is larger than the maximum value, it is configured to have a function of distinguishing and determining each as a "late start abnormality".

Further, the abnormality determining means 67 determines "all early start abnormality" when all the flow detectors 30 are "early start abnormality", and "all late start abnormality" when all the flow detectors 30 are "late start abnormality". It is configured with a function to judge.

Further, the management unit 60 has an operation time recognition means 70 that recognizes the operation time from the start to the stop of the lubrication pump 20, and an operation that the operation time recognition means 70 recognizes by the open / close detection means 62 for each flow detector 30. The open / non-detection notification means 71 that notifies when the opening of the valve body 40 is not detected even after the time has passed, and the operation time recognized by the operation time recognition means 70 by the open / close detection means 62 for each flow detector 30. It is configured to include a closing / non-detecting notification means 72 for notifying when the closing of the valve body 40 is not detected even after passing.

The abnormality determining means 67 has a function of determining "non-opening abnormality" when the opening / non-detection detecting means 71 notifies that the opening / non-opening detecting means 71 does not detect the opening of the valve body 40 for each flow detector 30. Each flow detector 30 is configured to have a function of determining "non-closed abnormality" when the closing / non-detection detecting means 72 notifies that the closing of the valve body 40 is not detected.

Furthermore, the management unit 60 counts the number of times the valve body 40 is opened and closed by the open / close detection means 62 for each flow detector 30 within the operation time from the start to the stop of the lubrication pump 20 recognized by the operation time recognition means 70. The opening / closing number counting means 73, the appropriate opening / closing number storage means 74 for storing the appropriate opening / closing number of the valve body 40 for each flow detector 30 within the operating time from the start to the stop of the lubrication pump 20, and each flow detector. It is configured to include an opening / closing number determining means 75 for determining whether the opening / closing number counted by the opening / closing number counting means 73 is within or outside the appropriate opening / closing number range stored by the appropriate opening / closing number storage means 74 every 30.

Appropriate number of times of opening and closing The appropriate number of times of opening and closing of the valve body 40 for each flow detector 30 stored in the storage means 74 differs for each lubrication point depending on, for example, the type of lubricating oil and the discharge amount of the metering valve V. , Perform a test for each lubrication point L to determine. The minimum and maximum values of the appropriate number of times the valve body 40 is opened and closed are obtained.

The abnormality determination means 67 is configured to have a function of determining an abnormality when the opening / closing number determination means 75 determines that at least one of the flow detectors 30 is out of range. Specifically, the opening / closing number determination means 75 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 74 and whether it is larger than the maximum value of the appropriate number range. It is configured with functions. When the abnormality determining means 67 determines that the opening / closing number of times is smaller than the minimum value for each flow detector 30, the opening / closing number of times determining means 75 determines that the opening / closing number of times is smaller than the minimum value. When it is judged to be larger, it is configured to have a function to distinguish and judge each as "multiple abnormalities".

Further, as shown in FIG. 7, the abnormality detecting device K includes a display means 80 for displaying the abnormality content corresponding to the determination result determined by the abnormality determining means 67. The display means 80 may display, for example, a screen. It can be configured with a monitor or the like to perform the above. As shown in FIG. 7, the display contents displayed by the display means 80 are "normal", "early start abnormality", "late start abnormality", "all early start abnormality", "all late start abnormality", and "non-open". "Abnormal", "Abnormal immobility", "Abnormal number of times", "Abnormal number of times". The display is performed for each number of the flow detector 30 (SM1 to SMN). If 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, the management unit 60 has a function of controlling the operation of the lubrication pump 20 of the lubrication system J as described above.

Therefore, in this injection molding machine M, the injection unit 2 and the mold clamping unit 3 are driven to perform injection molding, but while the injection molding machine M is being driven, the abnormality detection device K and its management unit 60 are controlled. The lubrication pump 20 of the lubrication system J is operated. The processing performed by the management unit 60 will be described with reference to the flowcharts shown in FIGS. 9 to 12.

With reference to the flowchart shown in FIG. 9, the temperature sensor S detects the temperature (S101), and in the management unit 60, the proper opening start time range deriving means 65 is used for each flow detector 30 (SM1 to SMn). , The temperature detected by the temperature sensor S is stored in the correlation storage means 64, and the appropriate opening start time range at the corresponding temperature is derived (S102). The proper opening start time range deriving means 65 sequentially updates and stores the proper opening start time range.

Then, when the predetermined time of the intermittent time is reached (S103Yes), the lubrication pump 20 is driven and the timer is activated (S104). As a result, lubricating oil is discharged from each metering valve V, and the lubricating oil is supplied to the lubricated portion 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 to open the valve body 40, and the lubricating oil flows into the fluid space E from the supply opening 33 and is discharged from the discharge opening 35, and then is discharged. , The valve body 40 returns and closes the supply opening 33. This opening / closing operation is different 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 (S105No), the opening / closing number of times counted by the opening / closing number counting means 73 is zero (S106Yes), so that the opening of the valve body 40 is detected until the timer time is reached (S107No). → S105). When the opening of the valve body 40 is not detected even after the timer time has arrived (S107Yes), after the pump is stopped (S108), the opening / non-detection detecting means 71 recognizes the open / closed detecting means 62, and the operating time recognizing means 70 recognizes the opening / closing detecting means 62. Assuming that the opening of the valve body 40 is not detected even after the operation time has passed, the abnormality determining means 67 determines that the valve body 40 is "non-opening abnormality" (S109) and displays it on the display means 80. On the other hand, when the opening of the valve body 40 is detected within the timer time (S105Yes), it is determined whether or not the opening is the first (S110), and since it is the first (S110Yes), the process proceeds to the next (a).

Then, referring to the flowchart shown in FIG. 10, the opening start time calculating means 63 detects the opening of the valve body 40 after the start / stop recognizing means 61 recognizes the start for each flow detector 30. The opening start time is calculated (S201). Then, the opening start time determining means 66 is within or outside the appropriate opening start time range derived by the appropriate opening start time range deriving means 65, which is calculated by the opening start time calculating means 63 for each flow detector 30. Is determined (S202). When the opening start time determining means 66 determines that the opening start time range is out of the proper opening start time range (S202No), the opening start time determining means 66 determines that the opening start time is the minimum of the proper opening start time range derived by the proper opening start time range deriving means 65. It is determined whether or not it is smaller than the value and whether or not it is larger than the maximum value of the proper opening start time range (S203). When it is determined that the opening start time is smaller than the minimum value (S203Yes), it is determined that "early start abnormality" (S204), and the opening start time determining means 66 determines that the opening start time is larger than the maximum value (S203No). , "Delayed start abnormality" is determined (S205). On the other hand, when the opening start time determining means 66 determines that the opening start time is within the proper opening start time range (S202Yes), the process proceeds to the next (b).

With reference to the flowchart shown in FIG. 11, in the management unit 60, the open / close detection means 62 detects that the valve body 40 is closed after it is opened (S301) until the timer time is reached. The closing of the valve body 40 is detected (S302No → S301). If the closing of the valve body 40 is not detected even after the timer time has arrived (S302Yes), after the pump has stopped (S303), the closing / non-detection detecting means 72 recognizes the open / closed detecting means 62, and the operating time recognizing means 70 recognizes it. Assuming that the closing of the valve body 40 is not detected even after the operation time has passed, the abnormality determining means 67 determines that the valve body 40 is "non-closing abnormality" (S304) and displays it on the display means 80.

On the other hand, when the closing of the valve body 40 is detected within the timer time (S301Yes), the opening / closing number counting means 73 counts the number of opening / closing times of the valve body 40 by the opening / closing detection means 62 once and integrates them (S305). Then, the opening and closing of the valve body 40 is detected as described above until the timer time is reached (S306No → c → S105Yes → S110No → b → S301Yes → S305 → S306). If there is a problem in this process, it is determined as "non-opening abnormality" (S109) and "non-closing abnormality" (S304) as described above.

When the timer time elapses (S306Yes), the pump is stopped (S307). Then, the number of times of opening / closing of the valve body 40 counted by the opening / closing number counting means 73 is determined (S308), and the number of opening / closing times counted by the opening / closing number counting means 73 for each flow detector 30 is appropriately opened / closed by the opening / closing number determining means 75. It is determined whether the number of times is within the range of the appropriate number of times of opening / closing stored by the number storage means 74 or outside the range (S309). When the opening / closing number determining means 75 determines that the opening / closing number is out of the appropriate opening / closing number range (S309No), the opening / closing number determining means 75 determines whether the appropriate opening / closing number is smaller than the minimum value of the stored appropriate number range and the appropriate number of times. It is determined whether or not it is larger than the maximum value of the range (S310). The abnormality determining means 67 determines that the number of times of opening / closing is smaller than the minimum value (S310Yes) for each flow detector 30, and determines that the number of times of opening / closing is abnormal (S311). When the means 75 determines that the number of times of opening / closing is larger than the maximum value (S310No), it is determined that the number of times of opening / closing is abnormal (S312). The abnormality determining means 67 displays the “small number of abnormalities” and the “many times abnormal” on the display means 80. On the other hand, when the opening / closing number determination means 75 determines that the opening / closing number is within the proper opening / closing number range (S309Yes), the process proceeds to the next (f).

Then, referring to the flowchart shown in FIG. 12, the abnormality determining means 67 includes whether or not there is an "early start abnormality" by the abnormality determining means 67 in all the flow detectors 30 (S401), and "late start abnormality". Whether or not (S402) is checked, and if there is no abnormality (S401No, S402No), it is determined to be "normal" (S403), and this is displayed on the display means 80. When there is an "early start abnormality" by the abnormality determining means 67 (S401Yes), it is determined whether or not it is present in all the flow detectors 30 (S404), and when all the flow detectors 30 are "early start abnormalities". (S404Yes), it is determined that "all early start abnormality" (S405). If not all (S404No), as an individual abnormality (S406), the display means 80 displays "early start abnormality" for each number of the flow detector 30 (SM1 to SMN).

Further, when there is a "delayed start abnormality" by the abnormality determining means 67 (S402Yes), it is determined whether or not it is present in all the flow detectors 30 (S407), and all the flow detectors 30 are "delayed start abnormalities". At (S407Yes), it is determined that "all delayed start abnormalities" (S408). If not all (S407No), as an individual abnormality (S409), the display means 80 displays "late start abnormality" for each number of the flow detector 30 (SM1 to SMN).

As shown in FIG. 7, the display means 80 includes "normal", "early start abnormality", "late start abnormality", "all early start abnormality", "all late start abnormality", "non-open abnormality", and ". One of "Abnormal immobility", "Abnormal number of times", and "Abnormal number of times" is displayed. Further, if there is an abnormality in any of the above, in addition to the display, for example, the driving of the injection unit 2 and the mold clamping unit 3 can be stopped, the alarm lamp can be turned on, or the alarm device can be sounded.

As a result, for example, in the case of "early start abnormality" in which the valve body 40 of the flow detector 30 starts opening earlier than the proper opening start time, for example, the slide bearing on the lubrication port P side is worn and affects the lubrication system J. You can know what you are doing. Further, when the "early start abnormality" reaches all the flow detectors 30, it is possible to know the lubricating oil abnormality such as the viscosity of the lubricating oil being too low. Further, for example, in the case of a "late start abnormality" in which the valve body 40 of the flow detector 30 starts opening later than the proper opening start time, for example, it is assumed that the load on the greasing pipe 23 is increasing, and the abnormality is known. be able to. Further, when the valve bodies 40 of all the flow detectors 30 start opening later than the proper opening start time, for example, the main pipe 22 is damaged or a large amount of air is mixed in to know the main pipe abnormality. be able to. As a result, it is possible to judge a wide range of abnormalities, and it is possible to judge an abnormality as accurately as possible, and it is possible to improve the reliability of abnormality detection. In addition, it becomes possible to know the type of abnormality and take appropriate measures.

Further, for example, in the case of "all early start abnormality" in which the valve bodies 40 of all the flow detectors 30 start opening earlier than the proper opening start time, for example, a lubricating oil abnormality such as the viscosity of the lubricating oil being too low may occur. You can know. Further, in the case of "total late start abnormality" in which the valve bodies 40 of all the flow detectors 30 start opening later than the proper opening start time, for example, the main pipe 22 is damaged or a large amount of air is mixed. It is possible to know the main piping abnormality such as. Therefore, it becomes possible to identify and know the type of abnormality, and it becomes possible to take even more appropriate measures.

Further, in the case of "non-opening abnormality", it is possible to know an abnormality such as a clogging of the valve V or the greasing pipe 23, for example. Therefore, it becomes possible to further identify and know the type of abnormality, and it becomes possible to take even more appropriate measures. Furthermore, in the case of "non-closed abnormality", for example, the abnormality of the flow detector 30 itself can be known. It will be possible to further identify and know the type of abnormality, and in this respect as well, it will be possible to take even more appropriate measures. In addition, it is possible to know abnormalities such as "small number of abnormalities" and "multiple abnormalities". For example, in the case of "multiple abnormalities", it is possible to know the increase in the greasing load. It will be possible to further identify and know the type of abnormality, and to take even more appropriate measures.

In the above embodiment, the temperature sensor S is provided so as to detect the temperature of the lubricating oil in the tank 20a of the lubricating pump 20, but the present invention is not necessarily limited to this, and the opening of the valve body 40 is started. If there is a correlation with time, it may be attached to the flow detector 30, and may be changed as appropriate. Further, the lubrication portion L is not limited to the above-mentioned portion, and it goes without saying that the lubrication portion L may be provided at any portion. In short, one of ordinary skill in the art can easily make many changes to these exemplary embodiments without substantially leaving the novel teachings and effects of the present invention, and many of these changes are of the present invention. Included in the range.

K Abnormality detection device M Injection molding machine J Lubrication system B Ball screw mechanism T Toggle mechanism L Lubrication point 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 port 35 Discharge opening 36 Discharge port 37 Contact part 38 Exposed part Da One electrode Db The other electrode 39 Bush 40 Valve body 41 Coil spring 42 Guide member S Temperature sensor 60 Management unit 61 Start / stop recognition means 62 Open / close detection Means 63 Open start time calculation means 64 Correlation storage means 65 Appropriate open start time range derivation means 66 Open start time determination means 67 Abnormality determination means 70 Operating time recognition means 71 Open / non-detection notification means 72 Close / non-detection notification means 73 Open / close count Counting means 74 Appropriate opening / closing number storage means 75 Opening / closing number determination means 80 Display means

Claims (7)

The lubrication pump is started and stopped, the lubricating oil is supplied from the lubrication pump to the main pipe at the time of starting, and the lubricating oil is intermittently supplied to the lubrication port from a plurality of metering valves connected to the main pipe via the lubrication pipe. In the abnormality detection device of the lubrication system provided in the lubrication system,
A flow detector that detects the flow of lubricating oil by opening and closing the internal valve body provided in each of the lubricating ports, a temperature sensor that detects the temperature of the lubricating oil, opening and closing of the valve body of each of the flow detectors, and the above. It is equipped with a management unit that manages abnormalities of the lubrication system based on the detected temperature of the temperature sensor.
The management unit has a start / stop recognizing means for recognizing the start and stop of the lubrication pump, an open / close detection means for detecting the opening and closing of the valve body of each of the flow detectors, and the start for each of the flow detectors. The opening start time calculating means for calculating the opening start time from the stop recognition means recognizing the start until the opening / closing detecting means detects the opening of the valve body, and the temperature and valve of the lubricating oil for each of the flow detectors. Appropriate and appropriate for the body Correlation storage means that stores the correlation with the opening start time range, and the temperature detected by the temperature sensor for each of the flow detectors is stored in the correlation storage means and is appropriate at the corresponding temperature. The proper opening start time range deriving means for deriving the opening start time range and the proper opening start time calculated by the opening start time calculating means for each of the flow detectors are derived by the proper opening start time range deriving means. It is provided with an opening start time determining means for determining whether it is within or outside the time range, and an abnormality determining means for determining an abnormality when the opening start time determining means determines that at least one of the flow detectors is out of range. An abnormality detection device for a lubrication system characterized by. Whether or not the opening start time determining means is smaller than the minimum value of the appropriate opening start time range derived by the appropriate opening start time range deriving means, and from the maximum value of the appropriate opening start time range. It is configured with a function to judge whether it is large or not,
When the opening start time determining means determines that the opening start time is smaller than the minimum value for each of the flow detectors, the abnormality determining means determines "early start abnormality" and determines the opening start time determining means. The abnormality detection device for a lubrication system according to claim 1, wherein when it is determined that the opening start time is larger than the maximum value, it is configured to have a function of distinguishing and determining each of them as a "delayed start abnormality". The abnormality determination means determines "all early start abnormality" when all the flow detectors are "early start abnormality", and determines "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, wherein the device is configured to have a function of performing the function. The management unit has passed the operation time recognition means for recognizing the operation time from the start to the stop of the lubrication pump and the operation time recognized by the operation time recognition means by the open / close detection means for each of the flow detectors. However, when the opening of the valve body is not detected, the opening / non-detection notification means is provided, and the abnormality determination means detects the opening of the valve body for each of the flow detectors. The abnormality detection device for a lubrication system according to any one of claims 1 to 3, further comprising a function of determining "non-opening abnormality" when notifying that the operation is not performed. For each of the flow detectors, the management unit provides a closing / non-detection notifying means for notifying when the opening / closing detecting means does not detect the closing of the valve body even after the operating time recognized by the operating time recognizing means has passed. In addition, the above-mentioned abnormality determining means has a function of determining each of the above-mentioned flow detectors as "non-closing abnormality" when the above-mentioned closing / non-detection detecting means notifies that the closing of the valve body is not detected. The abnormality detection device for a lubrication system according to claim 4, wherein the abnormality detection device is characterized. The management unit uses the operation time recognition means for recognizing the operation time from the start to the stop of the lubrication pump and the open / close detection means for each of the flow detectors within the operation time from the start to the stop of the lubrication pump. An opening / closing number counting means for counting the number of opening / closing times of the valve body, and an appropriate opening / closing number storage means for storing an appropriate opening / closing number of the valve body for each of the flow detectors within the operation time from the start to the stop of the lubrication pump. Each of the flow detectors is provided with an opening / closing number determining means for determining whether the opening / closing number counted by the opening / closing number counting means is within or outside the appropriate opening / closing number range stored by the appropriate opening / closing number storage means. The lubrication system according to any one of claims 1 to 5, wherein the means is provided with a function of determining an abnormality when the opening / closing number determination means determines that at least one of the flow detectors is out of range. Abnormality detection device. A function of determining whether or not the number of times of opening and closing is smaller than the minimum value of the appropriate number of times range stored by the means for storing the appropriate number of times of opening and closing, and whether or not the number of times of opening and closing is larger than the maximum value of the range of the appropriate number of times of opening and closing. Configured with
When the opening / closing number determining means determines that the opening / closing number is smaller than the minimum value for each of the flow detectors, the abnormality determining means determines that the opening / closing number of times is smaller than the minimum value. The abnormality detection device for a lubrication system according to claim 6, further comprising a function of distinguishing and determining "multiple abnormalities" when it is determined that the value is larger than the maximum value.

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