Method of using machine oil, machine oil regeneration system, and method of retrofitting machine oil regeneration unit

Abstract

To provide a method of using machine oil, a machine oil regeneration system, and a method of retrofitting a machine oil regeneration unit that can continuously use machine oil without the need for disposal.SOLUTION: A method of using machine oil for at least one of lubrication or power transmission comprises: a first oxidation stability determination step of determining whether oxidation stability of the machine oil that is currently in use or has already been used is at or above a first predetermined level; a first continued use step of continuing to use the machine oil that is currently in use or has already been used when the oxidation stability is determined to be at or above the first predetermined level; an addition step of adding a regeneration additive to the machine oil to bring the oxidation stability to or above a second predetermined level when the oxidation stability is determined to be below the first predetermined level; and a second continued use step of continuing to use the machine oil to which the additive has been added.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for using machine oil, a machine oil regeneration system, and a method for retrofitting a machine oil regeneration unit. [Background technology]

[0002] Patent Document 1 describes a method for regenerating used insulating oil. Specifically, an adsorbent having one or more of lime plaster, diatomaceous earth, bentonite, and marine silt is brought into contact with used insulating oil to adsorb deteriorated components in the insulating oil to the adsorbent, and then the adsorbent is removed from the insulating oil and an antioxidant is added to the insulating oil to obtain regenerated insulating oil. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 164188 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the method of Patent Document 1, it is possible to regenerate insulating oil, but it is not known whether it is possible to regenerate machine oil used for at least one of lubrication and power transmission.

[0005] The present disclosure provides a method for using machine oil that allows the machine oil to be used continuously without being discarded, a machine oil regeneration system, and a method for adding a machine oil regeneration unit. [Means for solving the problem]

[0006] A method of using a machine oil according to at least one embodiment of the present disclosure includes: 1. A method for using a machine oil for at least one of lubrication and power transmission, comprising: a first oxidation stability determination step of determining whether the oxidation stability of the machine oil in use or after use is equal to or greater than a first specified level; a first continuous use step of continuing to use the partially used or used machine oil when the oxidation stability is determined to be equal to or higher than the first specified level; If it is determined that the oxidation stability is below the first specified level, adding an additive for regeneration to the machine oil so that the oxidation stability is equal to or higher than a second specified level; A second continuous use step of continuously using the machine oil to which the additive has been added; Equipped with.

[0007] A machine oil regeneration system according to at least one embodiment of the present disclosure includes: A tank for storing used or in-use machine oil for at least one of lubrication and power transmission; An adsorption system comprising: A column packed with an adsorbent; an oil circulation path for circulating the machine oil between the column and the tank; an oil circulation pump disposed in the oil circulation path; an adsorption system configured to perform an adsorption process in which the machine oil is brought into contact with the adsorbent by driving the oil circulation pump; an additive supply device configured to be able to add an additive for regeneration to the machine oil regardless of whether the adsorption treatment is being performed; Equipped with.

[0008] A method for adding a machine oil regeneration unit according to at least one embodiment of the present disclosure includes: A method for regenerating a used or partially used machine oil stored in a tank for at least one of lubrication and power transmission, comprising: A column installation step of installing a column filled with an adsorbent; an oil circulation path installation step of installing an oil circulation path for circulating the machine oil between the column and the tank; a pump installation step of installing an oil circulation pump in the oil circulation path; an additive supply device installation step of installing an additive supply device configured to be able to add an additive for regeneration to the machine oil; Equipped with. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a method for using machine oil, a machine oil regeneration system, and a method for adding a machine oil regeneration unit, which allow the machine oil to be used continuously without being discarded. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram showing a schematic configuration of a machine oil regeneration system according to one embodiment. FIG. [Diagram 2] 4 is a flowchart showing a method of using machine oil according to one embodiment. [Diagram 3] 1 is a graph showing the relationship between the RPVOT residual rate and the acid number for a partially used or used machine oil. [Figure 4] 4 is a flow chart illustrating a method of using machine oil with additional steps according to one embodiment. [Figure 5A] FIG. 2 is a schematic diagram showing details of the machine oil regeneration system according to the first embodiment. [Figure 5B] FIG. 6 is a schematic diagram showing details of a machine oil regeneration system according to a second embodiment. [Figure 5C] FIG. 11 is a schematic diagram showing details of a machine oil regeneration system according to a third embodiment. [Figure 5D] FIG. 11 is a schematic diagram showing details of a machine oil regeneration system according to a fourth embodiment. [Figure 5E] FIG. 11 is a schematic diagram showing details of a machine oil regeneration system according to a fifth embodiment. [Figure 6A] FIG. 1 is a schematic diagram of a column according to a first embodiment. [Figure 6B] FIG. 1 is a schematic diagram of a column according to a second embodiment. [Figure 7]FIG. 1 is a schematic diagram illustrating a machine oil regeneration system before retrofit according to one embodiment. [Figure 8] 1 is a flowchart illustrating a method for retrofitting a machine oil regeneration unit according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as the embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present disclosure. For example, expressions expressing relative or absolute configuration, such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial," not only strictly express such a configuration, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions indicating that things are in an equal state, such as "identical," "equal," and "homogeneous," not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions describing shapes such as a rectangular shape or a cylindrical shape do not only refer to rectangular shapes, cylindrical shapes, etc. in the strict geometric sense, but also refer to shapes that include uneven portions, chamfered portions, etc., to the extent that the same effect is obtained. On the other hand, the expressions "comprise", "include", or "have" a certain element are not exclusive expressions excluding the presence of other elements. In addition, the same components are denoted by the same reference numerals and the description thereof may be omitted.

[0012] <Outline of Machine Oil Regeneration System 1> 1 is a schematic diagram showing a schematic configuration of a machine oil regeneration system 1 according to an embodiment of the present disclosure. The machine oil regeneration system 1 is configured to perform a regeneration process on machine oil 9 used by a machine oil-using device 100. The machine oil 9 is a lubricating oil used for smooth operation of moving parts constituting the machine oil-using device 100, or a hydraulic oil used in a hydraulic power transmission unit constituting the machine oil-using device 100.

[0013] As one example, the machine oil-using device 100 is a turbine such as a steam turbine or a gas turbine, and the lubricating oil is mainly turbine oil supplied to a turbine rotor, etc. As another example, the machine oil-using device 100 is a hydraulic cylinder, and hydraulic oil is supplied to the inside of the hydraulic cylinder.

[0014] The uses of lubricating oil and hydraulic oil are not limited to the above. In addition, the lubricating oil may have other functions, such as a cooling function for the moving parts, in addition to the lubricating function for the moving parts. The hydraulic oil may also have other functions, such as a lubricating function and a cooling function for the power transmission parts, in addition to the power transmission function.

[0015] The machine oil 9 deteriorates with use. For example, the longer the turbine oil is used, the more deteriorated components such as organic acids such as carboxylic acids and altered products of antioxidants are contained in the turbine oil, causing the color to change to brown. In this case, the oil performance, including the lubricating performance, of the turbine oil is reduced. A similar deterioration phenomenon is also observed in hydraulic oil. The machine oil regeneration system 1 of this embodiment is configured to perform a regeneration process on the machine oil 9 in order to prevent the machine oil 9 that is in the middle of use or has been used from being discarded due to deterioration. The regeneration process includes at least one of a process of adding an additive 6 to the machine oil 9 and an adsorption process of bringing the machine oil 9 into contact with an adsorbent 8 (details will be described later).

[0016] 1, the configuration of the machine oil regeneration system 1 will be outlined. The machine oil regeneration system 1 includes a tank 10 for storing machine oil 9 used in a machine oil-using device 100, an adsorption system 3 for carrying out an adsorption process in which the machine oil 9 is brought into contact with an adsorbent 8, and an additive supply device 50 for adding an additive 6 to the machine oil 9.

[0017] Machine oil 9 flows into the tank 10 from the machine-oil-using device 100 via an oil discharge path 101. The machine oil 9 stored in the tank 10 is supplied to the machine-oil-using device 100 via an oil supply path 102. In this example, the machine oil 9 is supplied from the tank 10 to the machine-oil-using device 100 by operating a supply pump 105 arranged in the oil supply path 102. The number of tanks 10 may be one or more (a single tank 10 is illustrated in FIG. 1). The tank 10 may also be provided with an agitator 130 for agitating the machine oil 9.

[0018] The adsorption system 3 includes a column 7 filled with an adsorbent 8, an oil circulation path 40 for circulating machine oil 9 between the column 7 and a tank 10, and an oil circulation pump 48 arranged in the oil circulation path 40. The oil circulation path 40 has a supply path 41 for supplying the machine oil 9 from the tank 10 to the column 7, and a return path 42 for returning the machine oil 9 from the column 7 to the tank 10. The oil circulation pump 48 is arranged in the supply path 41. A filter 4 for collecting the adsorbent 8 flowing out from the column 7 may be arranged in the return path 42.

[0019] The number of columns 7 may be one or more (a single column 7 is illustrated in FIG. 1). The adsorbent 8 packed in the column 7 is silica gel, zeolite, activated alumina, activated clay, kaolin, or any combination thereof. The silica gel may be spherical silica gel or silica gel modified with an amino group.

[0020] An outline of the adsorption process performed by the adsorption system 3 is as follows. The machine oil 9 stored in the tank 10 flows into the column 7 via the supply path 41 by operation of the oil circulation pump 48. The machine oil 9 flowing in the column 7 is subjected to an adsorption process by coming into contact with the adsorbent 8. More specifically, the deteriorated components contained in the machine oil 9 are adsorbed by the adsorbent 8, and the deteriorated components are removed from the machine oil 9. The machine oil 9 discharged from the column 7 returns to the tank 10 via the return path 42. In this way, the deteriorated components are removed from the machine oil 9 in the tank 10, and the degree of deterioration caused by oxidation of the machine oil 9 can be reduced (the degree of deterioration will be described in detail later).

[0021] The additive supplying device 50 is configured to be able to add an additive 6 for regeneration to the machine oil 9. The additive supplying device 50 may be configured to directly supply the additive 6 to the machine oil 9 in the tank 10, or may be configured to supply the additive 6 to the machine oil 9 flowing through the return line 42. The additive 6 is an antioxidant, a rust inhibitor, an antifoaming agent, an antifriction agent, an extreme pressure agent, a metal deactivator, an antiemulsifier, or any combination thereof. The addition of the additive 6 restores the oxidation stability of the machine oil 9 (oxidation stability will be described in detail later).

[0022] The additive supplying device 50 is configured to add the additive 6 to the machine oil 9 regardless of whether the adsorption process is being performed or not. That is, the additive supplying device 50 can add the additive 6 while the machine oil 9 is passing through the column 7, or can add the additive 6 while the machine oil 9 is not passing through the column 7.

[0023] The inventors have discovered that in order to continuously use the machine oil 9 while avoiding significant oil deterioration, it is sufficient to subject the machine oil 9 to an adsorption process and a process of adding the additive 6 from time to time (the details of which will be described later with reference to FIG. 3). In this regard, according to the above-mentioned configuration, the adsorption system 3 can perform the adsorption process, and the additive supply device 50 can add the additive 6. This allows the machine oil 9 to be continuously used without being discarded. Furthermore, the inventors have discovered that the period during which the adsorption process is required as the deterioration progresses due to oxidation increases can be made longer than the period during which the additive 6 is required as the oxidation stability decreases. For example, when the machine oil 9 is turbine oil, the period during which the adsorption process is required can be adjusted from five times to six times the period during which the additive 6 is required. In this regard, according to the above-mentioned configuration, it is also possible for the additive supply device 50 to perform a process of adding the additive 6 without performing the adsorption process of the adsorption system 3. This allows the timing of performing the adsorption process and the additive addition process to be optimized, thereby realizing a machine oil regeneration system 1 that avoids unnecessary regeneration processes of the machine oil 9.

[0024] <Overview of how to use Machine Oil 9> A method for continuously using machine oil 9 using the machine oil regeneration system 1 will be outlined with reference to Fig. 2. Fig. 2 is a flow chart showing a method for using machine oil 9 according to one embodiment of the present disclosure, and in the example shown in Fig. 2, the regeneration process of machine oil 9 is carried out only by adding additive 6, without performing adsorption process by adsorption system 3. In the following description, "step" may be abbreviated as "S".

[0025] First, a first oxidation stability determination step (S11) is executed to determine whether the oxidation stability of the machine oil 9 in use or after use is equal to or higher than a first specified level. For example, an operator collects the machine oil 9 from the tank 10 at regular intervals to evaluate the oxidation stability of the machine oil 9. More specifically, the oxidation stability of the machine oil 9 is evaluated through the RPVOT residual rate of the machine oil 9. Here, the RPVOT residual rate indicates the ratio of the RPVOT value of the machine oil 9 in a used state to the RPVOT value of the machine oil 9 in an unused state. The RPVOT value is measured by an operator using various measuring instruments in accordance with the "Rotary Pressure Vessel Oxidation Stability" in JIS K 2514-3. The RPVOT residual rate is a value between 0% and 100%. As the degree of deterioration of the machine oil 9 due to oxidation increases, the RPVOT residual rate gradually decreases. In S11, if the RPVOT residual rate is equal to or higher than a first threshold value, the oxidation stability is determined to be equal to or higher than a first specified level. The first threshold value is determined based on the relationship shown in FIG. 3. For oil types such as those shown in the figure, in which the acid value increases sharply when the RPVOT residual rate falls below 50%, the first threshold value is 50% or more, and more specifically, 70% or more. In this way, the first threshold value is appropriately set according to the relationship between the RPVOT residual rate and the acid value.

[0026] If it is determined that the oxidation stability is equal to or higher than the first specified level (S11: YES), a first continued use step (S13) is executed to continue using the partially used or used machine oil 9. More specifically, if the supply pump 105 has stopped before the start of this flowchart, the supply pump 105 may resume operation in response to a positive determination in S11. Alternatively, if the supply pump 105 continues to operate after the start of this flowchart, a command indicating further continued operation may be input to the supply pump 105 in response to a positive determination in S11. After execution of S13, the process returns to S11.

[0027] As the machine oil 9 is used continuously, it is eventually determined that the oxidation stability is below the first specified level (S11: NO). In this case, an addition step is executed to add the additive 6 to the machine oil 9 so that the oxidation stability becomes equal to or higher than the second specified level (S51). In accordance with a command input by an operator or a controller, the machine oil-using device 100 adds the additive 6 to the machine oil 9. This restores the oxidation stability.

[0028] After S51 is performed, it is determined whether the oxidation stability of the machine oil 9 is equal to or greater than a second specified level (S53). More specifically, it is determined whether the RPVOT residual rate is equal to or greater than a second threshold. The second threshold may be equal to or greater than the first threshold, and in this example, is a value greater than the first threshold. That is, in this example, the second specified level is higher than the first specified level. If it is determined that the oxidation stability is less than the second specified level (S53: NO), the process returns to S51. If it is determined that the oxidation stability is equal to or greater than the second specified level (S53: YES), a second continued use step (S55) is performed to continue using the machine oil 9 to which the additive 6 has been added. S55 is a step similar to S13, and thereafter, the process returns to S11.

[0029] Here, since new additives 6 are sequentially added in S51, the oxidation stability is almost certainly restored to the second specified level or higher by repeating S51 and S53. Therefore, according to the above-mentioned method of use, the machine oil 9 can be used continuously for a long period of time. For example, it is possible to continue using the machine oil 9 for several years or more.

[0030] The evaluation of oxidation stability performed in S11 and S53 may be performed using a parameter other than the RPVOT residual ratio, such as the kinetic viscosity of the machine oil 9. In addition, the present disclosure is not limited to directly measuring the RPVOT residual ratio, and oxidation stability may be evaluated by sensing a parameter correlated with the RPVOT residual ratio. In this case, S11 and S53 may be performed by a controller instead of an operator.

[0031] The inventor discovered that if the additive 6 is added to the machine oil 9 from time to time so that the oxidation stability of the machine oil 9 is maintained at a certain level or higher, the machine oil 9 can be used continuously while maintaining its oil performance. Specifically, the inventor obtained the findings shown in FIG. 3. The figure is a graph showing the relationship between the RPVOT residual rate and the acid value, obtained by the inventor by testing used machine oil 9 (more specifically, turbine oil). As can be seen from the graph, when the RPVOT residual rate of the machine oil 9 falls below 50%, the acid value of the machine oil 9, which is an index of the degree of deterioration due to oxidation, increases sharply. In other words, it was found that if the process of adding the additive 6 is repeated so that the RPVOT residual rate of the machine oil 9 does not fall below 50%, the machine oil 9 can be used continuously while suppressing the degree of deterioration of the machine oil 9.

[0032] In this regard, according to the method of using the machine oil 9 illustrated in Fig. 2, even if the oxidation stability of the machine oil 9 falls below the first specified level, the oxidation stability of the machine oil 9 can be restored to the second specified level or higher by executing the step (S51) of adding the additive 6. This makes it possible to maintain the degree of deterioration of the machine oil 9 due to oxidation at the initial level, and allows the machine oil 9 to be used continuously without being discarded.

[0033] <Method of using machine oil 9 with additional steps> Fig. 4 is a flow chart showing a method of using machine oil 9 including additional steps according to an embodiment of the present disclosure. In Fig. 4, the same steps as in Fig. 2 are given the same step numbers, and their explanations are omitted or simplified below. In Fig. 4, in addition to the steps shown in Fig. 2, S21 to S29 are executed, and these steps are related to the adsorption process.

[0034] S21 is executed when a negative determination is made in S11. In S21, it is determined whether the degree of deterioration due to oxidation of the partially used or used machine oil 9 is below a first degree of deterioration. The degree of deterioration due to oxidation is, for example, an acid value. If the acid value is below the first acid value threshold, the degree of deterioration is determined to be below the first degree of deterioration. Conversely, if the acid value is equal to or greater than the first acid value threshold, the degree of deterioration is determined to be equal to or greater than the first degree of deterioration. An example of the first acid value threshold is 0.1 mgKOH / g. The acid value is measured by an operator using various measuring instruments in accordance with JIS K2501:2003.

[0035] When it is determined that the deterioration degree is equal to or higher than the first degree (S21: NO), an adsorption step (S23) is executed to subject the machine oil 9 to an adsorption treatment. More specifically, the oil circulation pump 48 is operated to cause the machine oil 9 to flow into the column 7, and the adsorption treatment is executed.

[0036] After execution of S23, it is determined whether the deterioration degree of the machine oil 9 falls below the second deterioration degree (S25). More specifically, it is determined whether the acid value falls below the second acid value threshold. The second acid value threshold may be any value equal to or less than the first acid value threshold, and in this example, is the same value as the first acid value threshold. If it is determined that the deterioration degree falls below the second deterioration degree (S25: YES), the above-mentioned step (S51) of adding the additive 6 to the machine oil 9 is executed.

[0037] If the deterioration degree is equal to or greater than the second degree (S25: NO), it is determined whether the number of consecutive executions of the adsorption process (N) is equal to or greater than a specified number. If N is less than the specified number (S27: NO), S23 and S25 are executed again in this order. Note that N is the number of consecutive executions of S23 and S25.

[0038] According to the inventor's findings, when the adsorbent 8 is used continuously for a long period of time, deteriorated components are accumulated in the adsorbent 8, and the adsorption capacity of the adsorbent 8 decreases. In this case, even if the adsorption process (S23) is repeatedly performed, the deterioration degree does not fall below the second degree (S25: NO), and N reaches the specified number of times (S27: YES). At this time, the column 7 filled with the adsorbent 8 is replaced with a new column 7 (S29). Thereafter, the process returns to S23. After the column 7 is replaced, sufficient adsorption capacity is exerted in S23, the deterioration degree falls below the second degree (S25: YES), and the above-mentioned S51 is executed. Note that N is initialized to 0 when S29 is executed.

[0039] The present disclosure is not limited to the evaluation of the deterioration degree performed in S21 and S25 through the acid value. For example, the deterioration degree may be evaluated by sensing a parameter correlated with the acid value. In this case, S21 and S25 may be performed by a controller instead of an operator.

[0040] In the example of Fig. 4, when it is determined that the deterioration degree of the machine oil 9 falls below the first deterioration degree (S21: YES), a step (S51) of adding the additive 6 is executed. According to the inventor's knowledge, even if the machine oil 9 is continuously used while adding the additive 6, the deterioration degree of the machine oil 9 due to oxidation increases. In this regard, according to the above-mentioned configuration, the addition step (S51) is executed on the machine oil 9 whose deterioration degree has been suppressed, so that it is possible to avoid a problem in which the deterioration degree due to oxidation does not return to normal even if the addition step is executed.

[0041] 4, even if the degree of deterioration falls below the second degree of deterioration (S25: YES) by performing the adsorption process (S23), the step of adding the additive 6 (S51) is performed. When the degree of deterioration of the machine oil 9 is high, the adsorption process (S23) is performed before the addition step (S51), so that the degree of deterioration due to oxidation of the machine oil 9 can be reliably maintained at the initial degree.

[0042] In the example of Fig. 4, if the degree of deterioration does not fall below the second degree of deterioration even after the adsorption process (S23) is repeated (S25: NO, S27: YES), the column 7 packed with the adsorbent 8 is replaced (S29). If the adsorption capacity of the adsorbent 8 decreases due to continued use, the adsorbent 8 can be replaced, so that effective adsorption process can be continuously maintained. This makes it possible to continue using the machine oil 9 for a longer period of time.

[0043] <Example of a specific configuration of the machine oil regeneration system 1> Specific configurations of machine oil regeneration systems 1 according to several embodiments are illustrated with reference to Figures 5A to 5E. Figure 5A shows a schematic diagram of a machine oil regeneration system 1A(1) according to a first embodiment, Figure 5B shows a machine oil regeneration system 1B(1) according to a second embodiment, Figure 5C shows a machine oil regeneration system 1C(1) according to a third embodiment, Figure 5D shows a machine oil regeneration system 1D(1) according to a fourth embodiment, and Figure 5E shows a machine oil regeneration system 1E(1) according to a fifth embodiment.

[0044] As shown in FIGS. 5A to 5D, the machine oil regeneration system 1A to 1D (1) includes tanks 10A to 10D (10), additive supply devices 50A to 50D (50), and oil circulation paths 40A to 40D (40).

[0045] The additive supplying device 50A-50D (50) is configured to supply the additive 6 to the inside of the tank 10A-10D (10) via an additive supplying path 55 different from the oil circulation path 40A-40D (40). The additive supplying path 55 may be a pipe connected to the tank 10A-10D, or may be a space (area) through which the additive 6 passes when it falls. The additive 6 flows into the tank 10A-10D at a position away from both the connection position C1 between the supply path 41 and the tank 10A-10D and the connection position C2 between the return path 42 and the tank 10A-10D.

[0046] The process of adding the additive 6 is carried out at a location separate from the oil circulation path 40 where the adsorption process is carried out. This makes it easy to carry out the process of adding the additive 6 separately from the adsorption process.

[0047] 5A to 5C, the tanks 10A to 10C include a first tank 11 and a second tank 12. The first tank 11 is connected to each of the oil discharge passage 101 and the oil supply passage 102. That is, the first tank 11 is configured to store the machine oil 9 discharged from the machine oil-using device 100, and is configured to release the machine oil 9 toward the machine oil-using device 100.

[0048] The second tank 12 is disposed separately from the first tank 11. An oil circulation path 40 is connected to the second tank 12. That is, the machine oil 9 stored in the second tank 12 is supplied to the column 7 via a supply path 41, and the machine oil 9 flowing out from the column 7 is returned to the column 7 via a return path 42.

[0049] The machine oil regeneration systems 1A to 1C include a connection flow path unit 60 that connects the first tank 11 and the second tank 12. The connection flow path unit 60 includes a first oil flow path 61 for guiding the machine oil 9 from the first tank 11 to the second tank 12, a first pump 63 arranged in the first oil flow path 61, a second oil flow path 62 for guiding the machine oil 9 from the second tank 12 to the first tank 11, and a second pump 64 arranged in the second oil flow path 62. When a regeneration process of the machine oil 9 is performed, the first pump 63 is driven, and the machine oil 9 flows from the first tank 11 to the second tank 12. The regenerated machine oil 9 in the second tank 12 is returned to the first tank 11 by driving the second pump 64.

[0050] The additive supplying devices 50A to 50C are configured to supply the additive 6 to at least the second tank 12. More specifically, the additive supplying devices 50A to 50C include a second additive supplying device 52 for supplying the additive 6 to the second tank 12. In addition, the agitators 130A to 130C (130) include a second agitator 132 for agitating the machine oil 9 stored in the second tank 12.

[0051] According to the above configuration, the regeneration process of the machine oil 9 is performed in the second tank 12, which is different from the first tank 11, which is required to appropriately release the machine oil 9 toward the machine oil-using device 100. This makes it possible to perform the regeneration process more simply. As a more specific example, in an embodiment in which the machine oil 9 is regenerated in a batch manner during regular inspection of the machine oil-using device 100, it is possible to regenerate the machine oil 9 in the second tank 12, which is different from the first tank 11. As another example, in an embodiment in which the machine oil 9 is regenerated in a continuous manner during the operation of the machine oil-using device 100, the machine oil 9 can be regenerated in the second tank 12, which is different from the first tank 11, so that the machine oil 9 can be regenerated without impeding the flow of the machine oil 9 between the first tank 11 and the machine oil 9.

[0052] 5B and 5C, the additive supplying devices 50B and 50C further include a first additive supplying device 51 for supplying the additive 6 to the first tank 11, in addition to the above-mentioned second additive supplying device 52. Also, the agitators 130B and 130C (130) include a first agitator 131 for agitating the machine oil 9 stored in the first tank 11. According to the above configuration, the process of adding the additive 6 can be performed in both the first tank 11 and the second tank 12, so that the oil performance can be more reliably maintained.

[0053] 5C, the second tank 12 of the tank 10C is connected to the first tank 11 via a connection passage unit 60 while being mounted on the transport vehicle 5. The connection passage unit 60 is disposed so as to be detachable from the first tank 11 and the second tank 12. The adsorption system 3 may be mounted on the transport vehicle 5 together with the second tank 12, or may be connected to the second tank 12 while being installed on land.

[0054] According to the above configuration, only when regeneration of the machine oil 9 is required, the transport vehicle 5 carrying the second tank 12 is moved to the vicinity of the first tank 11, and the second tank 12 is connected to the first tank 11 via the connection flow path unit 60. This allows the second tank 12 and the connection flow path unit 60 to be used in another machine oil regeneration system 1 or stored in a dedicated area when regeneration is not required. This allows the second tank 12 and the connection flow path unit 60 to be used more flexibly.

[0055] As shown in Fig. 5D, the tank 10D of the machine oil regeneration system 1D includes the first tank 11 but does not include the second tank 12 (see Figs. 5A to 5C). In the example shown in Fig. 5D, an oil circulation path 40D is connected to the first tank 11, and the additive supply device 50D includes the first additive supply device 51 but does not include the second additive supply device 52 (see Figs. 5A to 5C). According to the above configuration, the regeneration process of the machine oil 9 can be performed without installing the second tank 12 separate from the first tank 11, so that the machine oil regeneration system 1 can be made compact.

[0056] As shown in Fig. 5E, the tank 10E(10) of the machine oil regeneration system 1E(1) includes a first tank 11 but does not include a second tank 12 (see Figs. 5A to 5C). Furthermore, the oil circulation path 40E(40) constituting the machine oil regeneration system 1E(1) further includes a bypass path 43 connected to the supply path 41 and the return path 42 so as to bypass the column 7.

[0057] A valve 45 is further disposed in the oil circulation path 40E. The valve 45 is configured so that the machine oil 9 flowing through the supply path 41 selectively flows to either the column 7 or the bypass path 43. The valve 45 in this example is a three-way valve disposed at a position where the bypass path 43 and the supply path 41 are connected. The valve 45 may be an on-off valve disposed in at least one of the bypass path 43 or the supply path 41.

[0058] 5E is disposed in the supply passage 41 upstream of the valve 45. The present disclosure is not limited thereto, and the oil circulation pump 48 may be composed of a first oil circulation pump disposed between the valve 45 and the column 7, and a second oil circulation pump disposed in the bypass passage 43.

[0059] The additive supplying device 50E illustrated in FIG. 5E is disposed in the return path 42 downstream of the position where the bypass path 43 and the return path 42 are connected. When the additive 6 addition process is performed, the valve 45 is switched so that the machine oil 9 does not flow into the bypass path 43. The additive 6 is added from the additive supplying device 50E to the machine oil 9 flowing through the return path 42 via the bypass path 43 by the drive of the oil circulation pump 48. When the adsorption process of the column 7 is performed, the valve 45 is switched so that the machine oil 9 flows into the column 7. As a result, the machine oil 9 flowing through the supply path 41 flows in order through the supply path 41, the column 7, and the return path 42 as the oil circulation pump 48 is driven. At this time, the additive supplying device 50E does not operate.

[0060] According to the above-mentioned configuration, the additive 6 can be selectively added or adsorbed to the machine oil 9 flowing through the oil circulation path 40.

[0061] <Example of a specific configuration of column 7> Fig. 6A is a schematic diagram of a column 7A(7) according to the first embodiment, and Fig. 6B is a schematic diagram of a column 7B(7) according to the second embodiment. The columns 7A and 7B may be applied to any of the machine oil regeneration systems 1A to 1E(1) shown in Figs. 5A to 5E.

[0062] As shown in FIG. 6A, in the first embodiment, a plurality of columns 7A (7) are arranged in parallel to one another on an oil circulation path 40F (40). More specifically, the oil circulation path 40F has a plurality of column connection paths 47 in which a plurality of columns 7A are respectively arranged. Each of the plurality of column connection paths 47 arranged in parallel to one another is connected to a supply path 41 and a return path 42. A plurality of flow adjustment valves 46 may be arranged in each of the plurality of column connection paths 47. Furthermore, a plurality of on-off valves 44 may be further arranged in each of the plurality of column connection paths 47. may be arranged.

[0063] According to a configuration in which a plurality of columns 7A are arranged in parallel with each other, a decrease in the flow rate due to pressure loss of the machine oil 9 in the oil circulation path 40F can be suppressed, and the time required for the adsorption process can be shortened. Also, according to a configuration in which a plurality of flow control valves 95 are arranged in each of the plurality of column connection paths 47, the machine oil 9 can be made to flow evenly through the plurality of columns 7A, and the adsorption process can be performed evenly in the plurality of columns 7A.

[0064] At least one of the multiple columns 7A shown in FIG. 6A is configured to be replaceable with a new column 7A filled with unused adsorbent 8. For example, the on-off valve 44 corresponding to a column 7A that is due for replacement among the multiple columns 7A is closed, and the column 7A is replaced with a new column 7A. During the replacement work, machine oil 9 may be poured into the remaining columns 7A that are not due for replacement, and an adsorption process may be performed. According to the above configuration, the adsorption capacity can be restored by replacing the column 7A, so that the machine oil 9 can be used continuously for a longer period of time.

[0065] 6A, a heater 77 for adjusting the temperature of the machine oil 9 flowing in the column 7A may be further disposed in the oil circulation path 40F. In the illustrated example, the heater 77 is disposed upstream of the connection position between the supply path 41 and the multiple column connection paths 47. According to the above configuration, the temperature of the machine oil 9 can be adjusted to a temperature suitable for the adsorption process, thereby improving the adsorption efficiency in the column 7A.

[0066] 6B, the column 7B(7) includes one end 71 where an inlet 7a for the machine oil 9 is formed, and the other end 72 where an outlet 7b for the machine oil 9 is formed. In the flow direction of the machine oil 9 in the column 7B (the direction of the arrow Z), the one end 71 has a shape in which the inner diameter becomes smaller toward the upstream side, and the other end 72 has a shape in which the inner diameter becomes smaller toward the downstream side. With this configuration, it is possible to prevent the machine oil 9 from stagnating near the inlet 7a or the outlet 7b, so that a more effective adsorption process can be performed on the machine oil 9.

[0067] <Machine Oil Regeneration Unit 2> 7 and 8, a method of adding a machine oil regeneration unit 2 including an adsorption system 3 and an additive supply device 50 to a pre-modification machine oil regeneration system 1F(1) is illustrated. FIG. 7 is a schematic diagram showing a pre-modification machine oil regeneration system 1F according to an embodiment of the present disclosure. FIG. 8 is a flow chart showing a method of adding a machine oil regeneration unit 2 according to an embodiment of the present disclosure. The machine oil regeneration unit 2 (see FIG. 1) is a unit including an adsorption system 3 and an additive supply device 50.

[0068] As illustrated in Fig. 7, the machine oil regeneration system 1F before modification includes a tank 10, but does not include a machine oil regeneration unit 2 (see Fig. 1). As illustrated in Fig. 8, in the method for adding the machine oil regeneration unit 2, first, a column installation step (S101) is performed to install a column 7 filled with an adsorbent 8.

[0069] Next, an oil circulation path installation step (S103) is performed to install the oil circulation path 40. In S103, at least the supply path 41 and the return path 42 are installed. In S103, a bypass path 43 may be further installed. In this case, a valve 45 is also arranged.

[0070] Next, a pump installation step (S105) of installing the oil circulation pump 48 in the oil circulation path 40, an additive supply device installation step (S107) of installing the additive supply device 50, and an agitator installation step (S109) of installing the agitator 130 in the tank 10 are carried out in this order. This completes the installation of the machine oil regeneration unit 2 and the machine oil regeneration system 1 (see FIG. 1).

[0071] S101 to S109 are performed by an operator, a robot arm operated by the operator, or a combination of these. The order of execution of S101 to S109 may be changed as appropriate. Also, in addition to the steps shown in Fig. 8, a step of installing a heater 77 in the supply passage 41 may be additionally performed. Furthermore, when the tank 10 before modification is composed of only the first tank 11, the method of adding the machine oil regeneration unit 2 may further include a step of adding a second tank 12 and a step of adding a connection passage unit 60.

[0072] <Other> The "controller" in the above description is configured by a computer, and includes a processor, a memory (storage medium), and an external communication interface. The processor is a CPU, a GPU, an MPU, a DSP, or a combination of these. The memory is configured to store various data temporarily or non-temporarily, and is realized by at least one of a RAM, a ROM, and a flash memory, for example. The processor executes various control processes according to instructions of a program loaded into the memory.

[0073] <Summary> The contents described in the above-mentioned embodiments can be understood, for example, as follows.

[0074] 1) A method of using the machine oil (9) according to one embodiment of the present disclosure includes: 1. A method for using a machine oil for at least one of lubrication and power transmission, comprising: A first oxidation stability determination step (S11) of determining whether the oxidation stability of the machine oil in use or after use is equal to or higher than a first specified level; If it is determined that the oxidation stability is equal to or higher than the first specified level, a first continuous use step (S13) of continuing to use the partially used or used machine oil; If it is determined that the oxidation stability is below the first specified level, an addition step (S51) of adding a regeneration additive (6) to the machine oil so that the oxidation stability is equal to or higher than a second specified level; A second continuous use step (S55) of continuously using the machine oil to which the additive has been added; Equipped with.

[0075] The inventors discovered that if an additive is added to the machine oil from time to time so that the oxidation stability of the machine oil is maintained above a certain level, the machine oil can be used continuously while maintaining its oil performance. According to the above configuration 1), even if the oxidation stability of the machine oil falls below a first specified level, the addition step can be performed to restore the oxidation stability of the machine oil to a second specified level or higher. This allows the degree of deterioration of the machine oil due to oxidation to be maintained at the initial level, and the machine oil can be used continuously without being discarded.

[0076] 2) In some embodiments, the method for using the machine oil described in 1) above includes the steps of: The method further includes a first deterioration progress determination step (S21) of determining whether a deterioration progress degree due to oxidation of the machine oil in use or after use is below a first deterioration progress degree, prior to the adding step; The adding step is executed when it is determined in the first deterioration progress determining step that the deterioration progress degree falls below the first deterioration progress degree. (According to the inventor's knowledge, even if machine oil is used continuously while adding additives, the degree of deterioration of the machine oil due to oxidation increases. According to the configuration of 2) above, the addition step is performed on machine oil whose degree of deterioration has been suppressed, so that it is possible to avoid a problem in which the degree of deterioration due to oxidation does not return to normal even when the addition step is performed.

[0077] 3) In some embodiments, the method for using the machine oil described in 2) above includes the steps of: The method further includes an adsorption step (S23) of performing an adsorption treatment of contacting the machine oil with an adsorbent (8) before the addition step when the deterioration degree is determined to be equal to or greater than the first deterioration degree in the first deterioration progress determination step, The adding step adds the additive to the machine oil whose deterioration stage has fallen below a second deterioration stage as a result of the adsorption treatment.

[0078] According to the above configuration 3), when the deterioration degree of the machine oil is high, the adsorption process is performed before the addition step, thereby making it possible to more reliably maintain the deterioration degree of the machine oil due to oxidation at the initial degree.

[0079] 4) In some embodiments, a method for using the machine oil described in 3) above, comprising: The method further includes an adsorbent replacement step (S29) of replacing the adsorbent used in the adsorption process when the degree of deterioration does not fall below the second degree of deterioration even after the adsorption process is repeated a specified number of times.

[0080] According to the above configuration 4), when the adsorbent's adsorption capacity decreases due to continuous use, the adsorbent can be replaced. Since effective adsorption treatment can be continuously maintained, it becomes possible to continue using the machine oil for a longer period of time.

[0081] 5) The machine oil regeneration system (1) according to one embodiment of the present disclosure is A tank (10) for storing used or partially used machine oil (9) for at least one of lubrication and power transmission; An adsorption system comprising: a column (7) packed with an adsorbent (8); an oil circulation path (40) for circulating the machine oil between the column and the tank; an oil circulation pump (48) disposed in the oil circulation path; an adsorption system (3) configured to perform an adsorption process in which the machine oil is brought into contact with the adsorbent by driving the oil circulation pump; an additive supply device (50) configured to be able to add an additive for regeneration to the machine oil regardless of whether the adsorption treatment is being performed; Equipped with.

[0082] The inventors have discovered that in order to continuously use machine oil while avoiding significant oil deterioration, it is sufficient to subject the machine oil to an adsorption process and a process of adding additives from time to time. According to the above configuration 5), the adsorption process and the process of adding additives can be performed on the machine oil, so that the machine oil can be used continuously without being discarded. Furthermore, the inventors have discovered that the period during which the adsorption process is required as the oxidation progresses can be made longer than the period during which the addition of additives is required as the oxidation stability decreases. According to the above configuration 5), it is also possible to perform the process of adding additives without performing the adsorption process. This allows the timing of performing the adsorption process and the additive addition process to be optimized, thereby realizing a machine oil regeneration system that avoids unnecessary regeneration processes of the machine oil.

[0083] 6) In some embodiments, the machine oil regeneration system described in 5) above, The additive supply device is configured to supply the additive to the inside of the tank via an additive supply passage (55) that is different from the oil circulation passage.

[0084] According to the above configuration 6), the process of adding the additive is performed at a location separate from the oil circulation path where the adsorption process is performed, which makes it easy to perform the process of adding the additive separately from the adsorption process.

[0085] 7) In some embodiments, the machine oil regeneration system described in 6) above, The tank is a first tank (11) for storing the machine oil discharged from an oil-using device (machine oil-using device 100) that uses the machine oil; a second tank (12) that is disposed separately from the first tank and to which the oil circulation path is connected; Including, The machine oil regeneration system further includes a connection flow passage unit (60) for connecting the first tank and the second tank and through which the machine oil flows, The additive supply device is configured to supply the additive to at least the second tank.

[0086] According to the above configuration 7), the regeneration process of the machine oil is carried out in a second tank different from the first tank required to appropriately release the machine oil toward the oil-using device. This makes it possible to carry out the regeneration process more easily. As a more specific example, in an embodiment in which the machine oil is regenerated in a batch manner at the time of regular inspection of the oil-using device, it is possible to regenerate the machine oil in a second tank different from the first tank. As another example, in an embodiment in which the machine oil is regenerated in a continuous manner during the operation of the oil-using device, the machine oil can be regenerated in a second tank different from the first tank, so that the machine oil can be regenerated without impeding the flow of the machine oil between the first tank and the machine oil.

[0087] 8) In some embodiments, the machine oil regeneration system described in 7) above, The additive supply device includes: a first additive supply device (51) configured to supply the additive to the first tank; a second additive supply device (52) configured to supply the additive to the second tank; Includes.

[0088] According to the above configuration 8), the process of adding the additive can be performed in both the first tank and the second tank, so that the oil performance can be maintained more reliably.

[0089] 9) In some embodiments, the machine oil regeneration system according to 7) or 8) above, The second tank is connected to the first tank via the connection passage unit while being mounted on the transport vehicle (5).

[0090] According to the configuration of 9) above, only when the machine oil needs to be recycled, the transport vehicle carrying the second tank is moved to the vicinity of the first tank and the second tank is connected to the first tank via the connecting flow path unit. This allows the second tank and the connecting flow path unit to be used in another machine oil recycling system or stored in a dedicated area when the recycling is not required. This allows for more flexible use of the second tank and the connecting flow path unit.

[0091] 10) In some embodiments, the machine oil regeneration system described in 6) above, The tank includes a first tank (11) for storing the machine oil discharged from an oil-using device that uses the machine oil, the additive supply device is configured to supply the additive to the first tank; The oil circulation path is connected to the first tank.

[0092] According to the above configuration 10), the machine oil regeneration process can be carried out without providing a second tank separate from the first tank, so that the machine oil regeneration system can be made compact.

[0093] 11) In some embodiments, the machine oil regeneration system described in 5) above, The oil circulation path is a supply passage (41) for supplying the machine oil from the tank to the column; a return line (42) for returning the machine oil from the column to the tank; a bypass line (43) connected to the supply line and the return line so as to bypass the column; having the adsorption system further includes a valve (45) for selectively allowing the machine oil flowing through the supply line to flow to either the column or the bypass line; The additive supply device is disposed in the return passage downstream of a location where the bypass passage and the return passage join.

[0094] According to the above configuration 11), additive addition processing or adsorption processing can be selectively performed on the machine oil flowing through the oil circulation passage.

[0095] 12) In some embodiments, the machine oil regeneration system according to any one of 5) to 11) above, A plurality of the columns are arranged in parallel on the oil circulation path.

[0096] According to the above configuration 12), a decrease in the flow rate of the machine oil due to pressure loss in the oil circulation path can be suppressed, so that the time required for the adsorption process can be shortened.

[0097] 13) In some embodiments, the machine oil regeneration system described in 12) above, the oil circulation path has a plurality of columns arranged therein and a plurality of column connection paths (47) arranged in parallel with each other, The adsorption system further includes a plurality of flow regulation valves (46) disposed in the plurality of column connecting paths, respectively.

[0098] According to the above configuration 13), the machine oil can be made to flow evenly through the multiple columns, so that the adsorption process can be performed evenly in the multiple columns.

[0099] 14) In some embodiments, the machine oil regeneration system according to 12) or 13) above, At least one of the plurality of columns is configured to be replaceable.

[0100] According to the above configuration 14), the adsorption capacity can be restored by replacing the column, so that the machine oil can be used continuously for a longer period of time.

[0101] 15) In some embodiments, the machine oil regeneration system according to any one of 5) to 13) above, The column comprises: one end (71) in which the machine oil inlet (7a) is formed; the other end (72) where the machine oil outlet (7b) is formed; Including, In the flow direction of the machine oil in the column, The one end has a shape in which the inner diameter becomes smaller toward the upstream side, and The other end has a shape in which the inner diameter becomes smaller toward the downstream side.

[0102] According to the above configuration 15), since it is possible to prevent the machine oil from stagnating near the inlet or outlet, it is possible to carry out a more effective adsorption treatment of the machine oil.

[0103] 16) In some embodiments, the machine oil regeneration system according to any one of 5) to 14) above, The apparatus further includes a heater (77) configured to adjust the temperature of the machine oil flowing through the column.

[0104] According to the above configuration 16), the temperature of the machine oil can be adjusted to a temperature suitable for the adsorption process, thereby improving the adsorption efficiency in the column.

[0105] 17) A method for installing a machine oil regeneration unit (2) according to at least one embodiment of the present disclosure, A method for installing a machine oil regeneration unit for regenerating used or used machine oil (9) stored in a tank (10) for at least one of lubrication and power transmission, comprising the steps of: a column installation step (S101) of installing a column (7) packed with an adsorbent (8); an oil circulation path installation step (S103) of installing an oil circulation path (40) for circulating the machine oil between the column and the tank; a pump installation step (S105) of installing an oil circulation pump (48) in the oil circulation path; an additive supply device installation step (S107) for installing an additive supply device (50) configured to be able to add an additive for regeneration to the machine oil; Equipped with.

[0106] According to the configuration 17) above, the same technical advantages as those in 5) above can be obtained. [Explanation of symbols]

[0107] 1: Machine oil regeneration system 2: Machine oil regeneration unit 3: Adsorption system 4: Filter 5: Transport vehicle 6: Additives 7: Column 7a:Inlet 7b: Outlet 8: Adsorbent 9: Machine oil 10: Tank 11: First Tank 12: Second tank 40: Oil circulation path 41: Supply route 42: Return route 43: Bypass road 44: Opening and closing valve 45: Valve 46: Flow control valve 47: Column connection path 48: Oil circulation pump 50: Additive supply device 51: First additive supply device 52: Second additive supply device 55: Additive supply channel 60: Connection flow path unit 61: 1st oil flow path 62:Second oil flow path 63: First pump 64: Second pump 71:One end 72:Other end 77: Heater 95: Flow control valve 100: Equipment using machine oil (equipment using oil) 101:Oil drain path 102: Oil supply path 105: Supply pump 130: Mixer 131: First agitator 132: Second agitator C1: Connection position C2: Connection position Z : Arrow

Claims

1. 1. A method for using a machine oil for at least one of lubrication and power transmission, comprising: a first oxidation stability determination step of determining whether the oxidation stability of the machine oil in use or after use is equal to or greater than a first specified level; a first continuous use step of continuing to use the partially used or used machine oil when the oxidation stability is determined to be equal to or higher than the first specified level; If it is determined that the oxidation stability is below the first specified level, adding an additive for regeneration to the machine oil so that the oxidation stability is equal to or greater than a second specified level; A second continuous use step of continuously using the machine oil to which the additive has been added; A method for using machine oil comprising the steps of:

2. The method further includes a first deterioration progress determination step of determining whether a deterioration progress degree due to oxidation of the machine oil in use or after use falls below a first deterioration progress degree, prior to the adding step; The adding step is executed when it is determined in the first deterioration progress determination step that the deterioration progress degree falls below the first deterioration progress degree. A method for using the machine oil according to claim 1.

3. and an adsorption step of performing an adsorption treatment of contacting the machine oil with an adsorbent before the adding step when the deterioration degree is determined to be equal to or greater than the first deterioration degree in the first deterioration progress determination step, The adding step includes adding the additive to the machine oil whose deterioration degree has fallen below a second deterioration degree by performing the adsorption treatment. A method for using the machine oil according to claim 2.

4. The method further includes an adsorbent replacement step of replacing the adsorbent used in the adsorption process when the degree of deterioration does not fall below the second degree of deterioration even after the adsorption process is repeated a specified number of times. A method for using the machine oil according to claim 3.

5. A tank for storing used or in-use machine oil for at least one of lubrication and power transmission; An adsorption system comprising: A column packed with an adsorbent; an oil circulation path for circulating the machine oil between the column and the tank; an oil circulation pump disposed in the oil circulation path; an adsorption system configured to perform an adsorption process in which the machine oil is brought into contact with the adsorbent by driving the oil circulation pump; an additive supply device configured to be able to add an additive for regeneration to the machine oil regardless of whether the adsorption treatment is being performed; A machine oil regeneration system equipped with:

6. The additive supply device is configured to supply the additive to the inside of the tank via an additive supply path different from the oil circulation path.

6. The machine oil regeneration system according to claim 5.

7. The tank is a first tank for storing the machine oil discharged from an oil-using device that uses the machine oil; a second tank that is disposed separately from the first tank and to which the oil circulation path is connected; Including, The machine oil regeneration system further includes a connection flow path unit for connecting the first tank and the second tank and through which the machine oil flows; The additive supply device is configured to supply the additive to at least the second tank.

7. The machine oil regeneration system according to claim 6.

8. The additive supply device includes: a first additive supply device configured to supply the additive to the first tank; a second additive supply device configured to supply the additive to the second tank; Includes 8. The machine oil regeneration system of claim 7.

9. The second tank is connected to the first tank via the connection passage unit while being mounted on the transport vehicle.

9. A machine oil regeneration system according to claim 7 or 8.

10. The tank includes a first tank for storing the machine oil discharged from an oil-using device that uses the machine oil, the additive supply device is configured to supply the additive to the first tank; The oil circulation path is connected to the first tank.

7. The machine oil regeneration system according to claim 6.

11. The oil circulation path is a supply path for supplying the machine oil from the tank to the column; a return line for returning the machine oil from the column to the tank; a bypass line connected to the supply line and the return line so as to bypass the column; having The adsorption system further includes a valve for selectively allowing the machine oil flowing through the supply line to flow to either the column or the bypass line; The additive supply device is disposed in the return passage downstream of a position where the bypass passage and the return passage are connected.

6. The machine oil regeneration system according to claim 5.

12. The columns are arranged in parallel on the oil circulation path.

8. A machine oil regeneration system according to any one of claims 5 to 7.

13. The oil circulation path has a plurality of columns arranged therein and a plurality of column connection paths arranged in parallel to each other, The adsorption system further includes a plurality of flow regulation valves respectively disposed in the plurality of column connection paths.

13. The machine oil regeneration system of claim 12.

14. At least one of the plurality of columns is configured to be replaceable.

13. The machine oil regeneration system of claim 12.

15. The column comprises: One end portion in which the machine oil inlet is formed; the other end where the machine oil outlet is formed; Including, In the flow direction of the machine oil in the column, The one end has a shape in which the inner diameter becomes smaller toward the upstream side, and The other end has a shape in which the inner diameter becomes smaller toward the downstream side.

8. A machine oil regeneration system according to any one of claims 5 to 7.

16. and a heater configured to adjust the temperature of the machine oil flowing through the column.

8. A machine oil regeneration system according to any one of claims 5 to 7.

17. A method for regenerating a used or partially used machine oil stored in a tank for at least one of lubrication and power transmission, comprising: A column installation step of installing a column filled with an adsorbent; an oil circulation path installation step of installing an oil circulation path for circulating the machine oil between the column and the tank; a pump installation step of installing an oil circulation pump in the oil circulation path; an additive supply device installation step of installing an additive supply device configured to be able to add an additive for regeneration to the machine oil; A method for adding a machine oil regeneration unit comprising:

Images