JP5670218B2 - Used oil recycling equipment - Google Patents

Description

This invention relates to recycling equipment that is to be supplied to the industrial machine again by recycling used oil flowing out from the industrial machine.

The recycling equipment of a conventional used oil are known those as described for example in Patent Document 1 below.

Japanese Patent Laid-Open No. 11-013991

  This means that after collecting used lubricating oil flowing out from industrial machines such as rolling mills and machine tools in a recovery tank, the used lubricating oil supplied from the recovery tank is pre-filtered, an oil purifying means comprising a main filter After that, the filtered lubricating oil that has been filtered is supplied to the lubricating oil tank, and fresh fresh lubricating oil is also supplied to the lubricating oil tank for mixing, and then mixed from the lubricating oil tank. Is supplied again to the industrial machine.

Here, in the conventional recycling equipment described above, the pre-filter immediately collect used lubricating oil, but so as to filter the oil purification device comprising a main filter, the spent lubricating oil oil Since the ratio of impurities to is high, the viscosity (kinematic viscosity) is high, and the filter is easily clogged early due to impurities. As a result, the pressure loss in the filter increases relatively rapidly with time, shortening the differential pressure life, and there is a problem that the filter must be frequently replaced. Here, in order to lengthen the above-mentioned differential pressure life, it is conceivable to increase the filtration area of the filter to suppress an increase in pressure loss. However, in this case, the recycle apparatus including the oil purifying means is enlarged. At the same time, there is a problem that the production cost becomes expensive.

This invention aims to provide a recycling equipment for used oil which can be made compact and inexpensive to manufacture.

Such object is achieved by a mixing means for mixing the recovery means for recovering the used oil flowing out from the industrial machine, and used oil supplied from said collecting means and unused fresh oil, the mixing means A kneading machine for kneading rubber with a filtering means for filtering the mixed oil mixed by the above and a supplying means for supplying the filtered mixed oil filtered by the filtering means to the industrial machine again. Supplying from the recovery means in a used oil recycling apparatus that uses process oil as fresh oil and supplies the filtered mixed oil as process oil to the rubber kneading chamber of the kneader by the supply means Sub-mixing means for mixing the used used oil and lubricating oil as unused fresh oil, and the sub-mixing means Sub-filtering means for filtering the mixed oil mixed, and sub-feeding means for supplying the filtered mixed oil filtered by the sub-filtering means to the sealing mechanism of the rotor shaft of the kneader again. This can be achieved by a used oil recycling apparatus that can switch and supply filtered mixed oil to at least one of the rubber kneading chamber and the sealing mechanism of the rotor shaft .

  In the present invention, the used oil supplied from the collecting means and the fresh fresh oil are mixed by the mixing means, and then the mixed oil is filtered by the filtering means. Used oil is diluted with fresh oil, and the ratio of impurities to oil is reduced. As a result, the viscosity (kinematic viscosity) of the mixed oil is lowered, and the clogging of the filtering means due to impurities is delayed. As a result, the differential pressure life of the filtering means can be easily extended without increasing the filtration area. Thus, it is possible to easily achieve downsizing of the apparatus and reduction in manufacturing cost.

Moreover, since the mixed-oil is consumed in rubber compounding, repeated number of uses of the oil is reduced, resulting in Ki de be easily prevent deterioration of the oil, and further, allowed quality of rubbers mixed kneaded Even when out of range, the supply destination of the mixed oil can be the rotor shaft seal mechanism, so that the used oil can be easily reused and mixed in both the rubber kneading chamber and the seal mechanism. When supplying oil, the reuse rate of used oil can be improved easily.

It is a partial front sectional view of a rubber kneader showing Embodiment 1 of the present invention. It is a circuit diagram of a recycling apparatus.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2, reference numeral 11 denotes a Banbury rubber kneader as an industrial machine. This rubber kneader 11 has a main body 13 in which a space for kneading raw rubber, that is, a rubber kneading chamber 12 is formed. An inlet 14 communicating with the rubber kneading chamber 12 is formed at the upper end of the main body 13, and unkneaded raw rubber is introduced into the rubber kneading chamber 12 through the inlet 14. Further, end plates 15 are fixed to both side ends of the main body 13, respectively. The main body 13 and the end plate 15 described above constitute a fixed housing 16 of the rubber kneader 11 as a whole.

  Reference numeral 19 denotes a pair of horizontal rotors extending in parallel to each other. The central part of these rotors 19 is located in the rubber kneading chamber 12, and the rotor shafts 20 provided at both ends thereof are formed on the end plate 15. Each of the through holes 15a is inserted into the through hole 15a and is rotatably supported by a bearing (not shown). Blades 21 are formed on the outer circumferences of the central portions of these rotors 19. When the rotors 19 are driven and rotated in the reverse direction by driving means (not shown), the raw rubber in the rubber kneading chamber 12 is removed. Knead. 24 is a sealing mechanism such as a mechanical seal interposed between the end plate 15 and the rotor shaft 20 of the rotor 19, and these sealing mechanisms 24 are made of carbon, rubber, etc. from the rubber kneading chamber 12 to the outside. Leakage and entry of dust, foreign matter and the like into the rubber kneading chamber 12 from outside are prevented. Each sealing mechanism 24 has a substantially cylindrical rotating ring 25 fitted to the rotor shaft 20, and a large-diameter portion 25 a is separated from the rotor 19 on the axially inner side of the rotating ring 25 adjacent to the rotor 19. A small-diameter portion 25b having a smaller diameter than the large-diameter portion 25a is formed on the outer side in the axial direction.

  Reference numeral 27 denotes a support ring which is mounted on the rotor shaft 20 on the outer side in the axial direction from the rotary ring 25 and has a plurality of support holes 27a formed on the outer end surface. The support holes 27a of these support rings 27 have their inner ends rotated. The outer portions of a plurality of bolts 28 screwed and fixed to the ring 25 are inserted. As a result, the rotating ring 25 and the support ring 27 can rotate integrally. Reference numerals 29 denote springs housed in the respective support holes 27a. These springs 29 are interposed between the bottom surface of the support holes 27a and the flanges 28a formed on the heads of the bolts 28 so that the rotary ring 25 is axially arranged. Energize outward. Reference numeral 31 denotes a ring-shaped fixing ring attached to the outer side surface of the end plate 15 so as to surround the outer end opening of the through hole 15a. The inner side surface 31a in the axial direction of these fixing rings 31 is a large diameter portion of the rotating ring 25 It abuts on a step surface 25c formed at the boundary between 25a and the small diameter portion 25b.

  When the rotor 19 rotates in such a state, the rotating ring 25 also rotates together with the rotor 19, so that the step surface 25c of the rotating ring 25 is in sliding contact with the inner surface 31a of the fixed ring 31 while being pressed by the spring 29. The space between the rotor shaft 20 and the fixed housing 16 is sealed. Here, both the rotation and fixing rings 25 and 31 are made of metal. However, if the rotation and fixing rings 25 and 31 are slidably contacted with each other, there is a risk that they will wear quickly. For this reason, lubricating oil (lubricating oil) made of a considerable amount of mineral oil is supplied to the sliding contact portion between the rotating ring 25 and the fixing ring 31 through the supply hole 32 formed in the fixing ring 31, and the rotation, Lubricating portions of the fixing rings 25 and 31 are lubricated to strongly suppress wear and cool down. The rotating ring 25, the spring 29, and the fixing ring 31 described above constitute the sealing mechanism 24 described above as a whole.

The end plate 15 is formed with a plurality of supply holes 34 whose inner ends are open at the boundary between the rotor shaft 20 and the blades 21 on the inner surface of the rubber kneading chamber 12, and the rubber kneading chamber 12 is formed through these supply holes 34. A process oil consisting of a considerable amount of mineral oil is supplied inside. The process oil supplied to the rubber kneading chamber 12 softens the raw rubber during kneading and improves its fluidity. Here, as described above, a part of the lubricating oil and the process oil supplied to the rubber kneader 11, for example, about 25% of the total supply amount leaks and flows out from the seal mechanism 24. Spilled used oil is mixed with impurities such as rubber and carbon during kneading. In the above-described embodiment, the Banbury rubber kneader 11 is used as an industrial machine. However, in the present invention, an extrusion rubber kneader may be used .

  A receiving tray 36 for receiving used oil leaking out from the sealing mechanism 24 is installed immediately below the rubber kneading machine 11, more specifically, the sealing mechanism 24, and used oil collected in the receiving tray 36 is collected through an oil passage 37. Collected in 38. The tray 36 and the recovery tank 38 described above constitute a recovery means 39 that recovers used oil that has flowed out of the rubber kneader 11 as a whole. In the present invention, the tray may be a tank, and the tank may be the recovery means. Reference numeral 40 denotes a main mixing tank. The other end of an oil passage 41 having one end connected to the recovery tank 38 is connected to the main mixing tank 40. Reference numeral 42 denotes a hydraulic pump provided in the middle of the oil passage 41, and used oil in the recovery tank 38 is supplied to the main mixing tank 40 by the hydraulic pump 42. A control valve 43 is provided in the oil passage 41 between the hydraulic pump 42 and the main mixing tank 40, and the flow rate of used oil supplied from the recovery tank 38 to the main mixing tank 40 by the control valve 43 is reduced. Be controlled.

  46 is a fresh oil source in which unused fresh oil is stored, and the other end of an oil passage 47 having one end connected to the fresh oil source 46 is connected to the main mixing tank 40. Fresh oil is supplied as process oil from the oil source 46 to the main mixing tank 40 through the oil passage 47. A control valve 48 is provided in the middle of the oil passage 47. The control valve 48 controls the flow rate of fresh oil supplied from the fresh oil source 46 to the main mixing tank 40. 49 is a stirring blade disposed in the main mixing tank 40, and this stirring blade 49 is connected to the output shaft of the drive motor 50. As a result, when the drive motor 50 is operated and the stirring blade 49 is rotated, The used oil supplied to the main mixing tank 40 and the unused fresh oil are stirred and mixed uniformly. The main mixing tank 40, the stirring blade 49, and the drive motor 50 described above constitute a main mixing unit 51 as a mixing unit that mixes used oil supplied from the recovery unit 39 and unused fresh oil. . In the present invention, used oil and fresh oil may be stirred and mixed by blowing air into the main mixing tank 40.

  Reference numeral 52 denotes a main filtration tank 57 and a rubber kneader 11, which will be described later. Specifically, a main supply tank as a cooling means provided between the main filtration means 57 and a main high-pressure pump 59 to be described later. The other end of the oil passage 55 having one end connected to 52 is connected to the main mixing tank 40. A hydraulic pump 56 is provided in the middle of the oil passage 55, and the hydraulic pump 56 supplies mixed oil of used oil and fresh oil mixed in the main mixing tank 40 from the main mixing tank 40 to the main supply tank. Supply to 52. The mixed oil supplied to the main supply tank 52 in this manner is cooled while being stirred by rotating the stirring blade 53 installed in the main supply tank 52 by the drive motor 54.

  The oil passage 55 between the hydraulic pump 56 and the main supply tank 52 is provided with a main filtration means 57 as a filtration means for filtering the mixed oil mixed by the main mixing means 51. In this embodiment, the first, second, and third filters 57a, 57b, and 57c are arranged in three stages. Here, the first, second, and third filters 57a, 57b, and 57c are high in filtration accuracy (finely) in the order, and as a result, impurities contained in the mixed oil have a large particle size. To the first, second and third filters 57a, 57b and 57c.

  Here, after the used oil supplied from the recovery means 39 and the fresh fresh oil supplied from the fresh oil source 46 are mixed by the main mixing means 51 as described above, the mixed oil is mixed with the main filtration means. Since the oil is filtered through 57, the mixed oil immediately before the filtration is obtained by diluting the used oil with fresh oil, and the ratio of impurities to the oil decreases. As a result, the viscosity (kinematic viscosity) of the mixed oil is lowered, and clogging of the first, second, and third filters 57a, 57b, and 57c (main filtration means 57) due to impurities is delayed. The differential pressure life of the main filtration means 57 can be easily extended without increasing the filtration area of the means 57, thereby making it possible to easily reduce the size of the apparatus and the manufacturing cost.

  The mixed oil filtered as described above is then supplied to the main supply tank 52 and stays in the main supply tank 52 for a certain period of time. 59 is a main high-pressure pump (high-pressure lubricator) as a supply means for discharging high-pressure oil such as a piston-type pump and a gear-type pump. The main high-pressure pump 59 and the main supply tank 52 are connected by an oil passage 60. The main high-pressure pump 59 and the rubber kneader 11 described above, more specifically, the supply hole 34, are connected by an oil passage 61. As a result, when the main high-pressure pump 59 is activated, the filtered mixed oil filtered by the main filtration means 57 flows from the main supply tank 52 into the main high-pressure pump 59 and is then pressurized to a high pressure to the oil passage 61. It is discharged and supplied again as process oil into the rubber kneading chamber 12 of the rubber kneading machine 11 through the supply hole 34 and reused.

  As described above, the industrial machine is composed of the rubber kneader 11 for kneading rubber, and process oil is used as fresh oil, and the filtered mixed oil is fed to the rubber kneading chamber 12 of the rubber kneader 11 by the main high-pressure pump 59. If the oil is supplied as a process oil, the mixed oil is consumed for rubber kneading, so that the number of repeated uses of the oil decreases, and as a result, deterioration of the oil can be easily prevented. A control valve 62 is provided in the middle of the oil passage 60 and controls the flow rate of used oil flowing from the main supply tank 52 into the main high-pressure pump 59.

  Reference numeral 63 denotes a steam source in which steam is stored, and a recovery tank 65 is connected to the other end of the steam passage 64 having one end connected to the steam source 63. Here, a part of the steam passage 64 is wound around the main mixing tank 40, and as a result, when the used oil and fresh oil in the main mixing tank 40 are mixed by the stirring blade 49, Heated by the steam passing through the steam passage 64. The steam source 63 and the steam passage 64 described above as a whole, when the used oil and fresh oil are mixed by the main mixing means 51, main heating means 66 as heating means for heating the used oil and fresh oil. Configure. If such a main heating means 66 is provided, the temperature of the used oil and fresh oil rises and the viscosity (kinematic viscosity) decreases, thereby further mixing the used oil and fresh oil. In addition to being uniform, the pressure loss when the mixed oil passes through the main filtration means 57 can be reduced.

  Here, as described above, when the mixed oil whose temperature has been raised by the heating of the main heating means 66 is supplied as it is to the rubber kneading chamber 12 of the rubber kneader 11, the temperature at the supply point rises, causing a problem. There is a risk of vulcanization occurring in a portion of the raw rubber being kneaded. However, such a situation is effectively prevented because the heated mixed oil is cooled while being temporarily stored in the main supply tank 52 functioning as a cooling means, and the temperature drops to about room temperature. Is done. In the present invention, a heat exchanger through which cooling water passes or an injector that injects cold water into the oil passage 60 or 61 may be used as the cooling means.

  Here, the heating temperature of the oil by the main heating means 66 is preferably in the range of 50 to 60 degrees C. The reason is that if it is less than 50 degrees C, the used oil and fresh oil may not be sufficiently mixed even if stirring is performed with the stirring blade 49. On the other hand, if it exceeds 60 degrees C, the main supply This is because even if the mixed oil is cooled by the tank 52, the temperature of the rubber kneading chamber 12 may rise too much. In the present invention, an electric heater, an induction heating device or the like can be used as the heating means. Reference numeral 67 denotes a control valve that is provided in the middle of the steam passage 64 and controls the flow rate of the steam guided from the steam source 63 to the main mixing tank 40.

  70 is a sub-mixing tank having the same configuration as the main mixing tank 40, and the sub-mixing tank 70 and the oil passage 41 are connected to each other by an oil passage 72 having a control valve 71 interposed in the middle thereof. As a result, the used oil that has flowed out of the rubber kneader 11 and recovered by the recovery means 39 is distributed and supplied from the recovery means 39 to the sub-mixing tank 70. The other end of the oil passage 73, one end of which is connected to the oil passage 47 between the fresh oil source 46 and the control valve 48, is connected to the sub-mixing tank 70. A control valve 74 similar to the valve 48 is provided. As a result, fresh oil is supplied as lubricating oil from the fresh oil source 46 to the sub-mixing tank 70 through the oil passage 73.

  Here, the same type of fresh oil is supplied from the single fresh oil source 46 to the main mixing tank 40 as process oil and to the sub-mixing tank 70 as lubricating oil. Two fresh oil sources with different types of fresh oil are installed, and the best fresh oil for process oil from one fresh oil source to main mixing tank 40, and the best for lubricating oil from the other fresh oil source. You may make it supply fresh oil to the submixing tank 70, respectively. The stirring blade 75 disposed in the sub-mixing tank 70 is connected to the output shaft of the drive motor 76. As a result, when the drive motor 76 operates and the stirring blade 75 rotates, the stirring blade 75 is supplied to the sub-mixing tank 70. The used oil and fresh oil are stirred and mixed uniformly. The sub-mixing tank 70, the stirring blades 75, and the drive motor 76 described above collectively use the used oil supplied from the recovery means 39 and the lubricating oil as unused fresh oil supplied from the fresh oil source 46. Submixing means 77 for mixing is configured.

  79 is a sub supply tank as sub cooling means having the same configuration as the main supply tank 52, and in the middle of an oil passage 80 connecting the sub supply tank 79 and the sub mixing tank 70, is the same as the hydraulic pump 56. The hydraulic pump 81 is provided. Further, in the oil passage 80 between the hydraulic pump 81 and the sub supply tank 79, the sub filtration means comprising the first, second and third filters 82a, 82b and 82c in the same three stages as the main filtration means 57 is provided. 82 is provided, and the sub-filtering unit 82 filters the mixed oil mixed by the sub-mixing unit 77. Here, as described above, the mixed oil immediately before being filtered by the sub-filter means 82 is obtained by diluting the used oil with fresh oil, so that the ratio of impurities to the oil decreases, resulting in the viscosity of the mixed oil. As a result, the clogging of the sub-filter means 82 due to impurities is delayed, and as a result, the differential pressure life of the sub-filter means 82 can be easily extended without increasing the filtration area of the sub-filter means 82, It is possible to easily achieve downsizing of the apparatus and reduction in manufacturing cost.

  Further, the sub supply tank 79 is provided with a stirring blade 84 and a drive motor 85 similar to the stirring blade 53 and the drive motor 54. As a result, the mixed oil supplied to the sub supply tank 79 is rotated and stirred. Cooling while stirring by the blades 84. 86 is a sub high pressure pump having the same configuration as the main high pressure pump 59 as a sub supply means, and this sub high pressure pump 86 and the sub supply tank 79 are connected by an oil passage 88 provided with a control valve 87 on the way. The auxiliary high-pressure pump 86 and the rubber kneader 11, specifically the supply hole 32, are connected by an oil passage 89. As a result, when the auxiliary high-pressure pump 86 is activated, the filtered mixed oil filtered by the auxiliary filtration means 82 flows from the auxiliary supply tank 79 into the auxiliary high-pressure pump 86, and then is pressurized to a high pressure and flows into the oil passage 89. The oil is discharged and supplied again as lubricating oil to the seal mechanism 24 of the rotor shaft 20 of the rubber kneader 11 through the supply hole 32 and reused.

  91 is a steam passage, one end of which is connected to the steam passage 64 between the steam source 63 and the control valve 67, a part of the steam passage 91 is wound around the sub-mixing tank 70, and the other end is the above-mentioned Connected to the recovery tank 65. Thereby, the used oil and fresh oil in the sub-mixing tank 70 are heated by the steam passing through the steam passage 91 during mixing. The steam source 63 and the steam passage 91 described above constitute a sub-heating unit 92 that heats the used oil and the fresh oil when the used oil and the fresh oil are mixed by the sub-mixing unit 77 as a whole.

  Here, in this embodiment, the steam source 63 is shared by the main heating means 66 and the sub-heating means 92, but the steam sources may be separated by the main heating means 66 and the sub-heating means 92. If such a sub-heating unit 92 is provided, the viscosity of the mixed oil is reduced, and the mixing of the oil becomes more uniform, and the mixed oil causes the sub-filtering unit 82 to be reduced, like the main heating unit 66. The pressure loss when passing can be reduced. Further, when the mixed oil heated by the sub-heating means 92 is supplied as it is to the seal mechanism 24 of the rubber kneader 11, the temperature at the supply point rises, causing a problem. For example, mixed oil (lubricating oil However, such a situation can be dealt with by cooling the mixed oil to about room temperature in the auxiliary supply tank 79 functioning as the auxiliary cooling means described above. Is possible. Reference numeral 93 denotes a control valve for controlling the flow rate of the steam disposed in the middle of the steam passage 91.

  95 is an oil passage having one end connected to the oil passage 47 between the fresh oil source 46 and the control valve 48 and the other end connected to the oil passage 60 between the main high-pressure pump 59 and the control valve 62. A control valve 96 is provided in the middle of the oil passage 95. Reference numeral 97 denotes an oil passage having one end connected to an oil passage 95 between the fresh oil source 46 and the control valve 96 and the other end connected to an oil passage 88 between the auxiliary high-pressure pump 86 and the control valve 87. The oil passage 95 or the oil passage 97 closes the control valve 62 when the mixed oil recycled for any reason cannot be supplied to the rubber kneading chamber 12 or the seal mechanism 24 of the rubber kneader 11. On the other hand, by opening the control valve 96, only fresh oil is used as process oil in the rubber kneading chamber 12 of the rubber kneader 11, or the control valve 87 is closed while the control valve 98 is opened. Thus, only fresh oil can be supplied to the seal mechanism 24 of the rubber kneader 11 as lubricating oil.

  Reference numeral 99 denotes a buffer tank connected to the oil passage 41 between the hydraulic pump 42 and the control valve 43 via the oil passage 100. The buffer tank 99 is an amount of used oil recovered by the recovery means 39. When the amount exceeds the recyclable amount, by opening the control valve 101, the excess amount of used oil is branched from the oil passage 41 and stored. The used oil stored in the buffer tank 99 can be recycled by another recycling device as needed, or used as fuel, and may be disposed of.

In the recycling apparatus described above, the used oil recovered by the recovery means 39 has a main mixing means 51, a main filtration means 57, and a main high-pressure pump 59, and the mixed oil is used as process oil in the rubber kneader 11. a main system line supplies, auxiliary mixing means 77, secondary filter means 82 has a secondary high-pressure pump 86, the mixed oil was placed 2 system line of the rubber kneading machine 11 to supply sub-system line as lubricating oil Yes.

  In this embodiment, in order to facilitate the improvement of the reuse rate of used oil, both the main system line and the sub system line described above are normally operated. When operating, the mixed oil is consumed by the rubber kneader 11, which reduces the number of times the oil is used repeatedly. As a result, oil deterioration can be easily prevented, so only the main system line is operated. It is preferable to make it. Here, the amount of used oil contained in the mixed oil supplied from the main system line is limited to such an extent that it does not affect the quality of the raw rubber to be kneaded. When the quality check in the subsequent process determines that the quality of the raw rubber is outside the allowable range, the main system line is stopped and only the sub system line is operated, and the supply destination of the mixed oil is set to the sealing mechanism 24 of the rotor shaft 20. It can also be only. Thus, in this embodiment, the filtered mixed oil can be switched and supplied to at least one of the rubber kneading chamber 12 of the rubber kneading machine 11 or the seal mechanism 24 of the rotor shaft 20, and the used oil can be effectively used. Can be recycled.

Next, the operation of the first embodiment will be described.
Now, it is assumed that the raw rubber introduced into the rubber kneader 11 from the inlet 14 is kneaded by a pair of rotors 19 (blades 21) rotating in the opposite direction. At this time, the process oil and lubricating oil recycled from the main and auxiliary high-pressure pumps 59 and 86 through the supply holes 34 and 32 are supplied to the rubber kneader 11 one after another, but more than half of these process oil and lubricating oil are Usually, it is consumed in raw rubber, but some of it leaks out of the sealing mechanism 24 and becomes used oil containing a lot of impurities. And recovered in the recovery tank 38. The used oil collected in the collection tank 38 in this manner is distributed and supplied to the main and sub-mixing tanks 40 and 70 while the flow rate is controlled by the control valves 43 and 71. The fresh oil used is also distributed and supplied to the main and sub mixing tanks 40 and 70 while the flow rate is controlled by the control valves 48 and 74.

  At this time, the amount of fresh oil supplied to the main mixing tank 40 is the amount of used oil supplied to the main mixing tank 40 from the amount of process oil supplied from the main high-pressure pump 59 to the rubber kneader 11. The amount of fresh oil supplied to the sub-mixing tank 70 is the same as the amount obtained by subtracting the amount, and the amount of lubricating oil supplied from the sub-high pressure pump 86 to the rubber kneader 11 is This is the same amount as the amount obtained by subtracting the amount of used oil supplied to. The used oil and fresh oil supplied to the main mixing tank 40 in this way are stirred and uniformly mixed by the rotation of the stirring blade 49 while being heated by the main heating means 66, while being supplied to the sub-mixing tank 70. The used oil and fresh oil are agitated by the rotation of the agitating blade 75 while being heated by the sub-heating means 92 and are uniformly mixed to become mixed oil.

  Thereafter, the mixed oil is sent from the main and sub mixing tanks 40 and 70 to the main and sub filtering means 57 and 82 by the operation of the hydraulic pumps 56 and 81, respectively. Thus, impurities contained in the mixed oil are sequentially filtered out by the first, second, and third filters 57a, 57b, and 57c of the main filtration means 57 from the large particle diameter, while the impurities contained in the mixed oil Are filtered out by the first, second, and third filters 8282a, 82b, and 82c of the sub-filter means 82 in order from a large particle size, and impurities are removed to the extent that they can withstand reuse.

  Here, since the mixed oil supplied to the main and sub filtration means 57 and 82 is diluted by adding fresh oil to the used oil as described above, impurities in the oil are reduced. While the ratio is decreased, the temperature is increased because the heating is performed by the main and sub heating means 66 and 92. As a result, the viscosity of any of the mixed oils is reduced, and the clogging of the main and sub filtration means 57 and 82 due to impurities is delayed. As a result, the filtration area of the main and sub filtration means 57 and 82 is increased. The life of the main and sub filtration means 57 and 82 can be easily extended without any problems.

  The mixed oil thus filtered is then supplied to the main and sub supply tanks 52 and 79 respectively, while being stirred by the stirring blades 53 and 84 in the main and sub supply tanks 52 and 79. Temporarily stored. As a result, the mixed oil that has been heated by the main and sub heating means 66 and 92 and has risen in temperature falls in the main and sub supply tanks 52 and 79 to about room temperature. Thereafter, the mixed oil in the main and sub supply tanks 52 and 79 is supplied to the main and sub high pressure pumps 59 and 86 while the flow rate is controlled by the control valves 62 and 87. 86 is a recycled process oil that pressurizes the mixed oil to a high pressure and supplies it to the rubber kneading chamber 12 of the rubber kneader 11 through the supply hole 34 and to the seal mechanism 24 of the rubber kneader 11 through the supply hole 32. Reuse as lubricating oil.

  The present invention can be applied to an industrial field in which used oil that has flowed out of an industrial machine is recycled and used again in the industrial machine.

11 ... Industrial machinery 20 ... Rotor shaft
24… Seal mechanism 39… Recovery means
51 ... Mixing means 52 ... Cooling means
57 ... Filtration means 59 ... Supply means
66 ... heating means 77 ... sub-mixing means
82 ... Sub filtration means 86 ... Sub supply means

Claims (1)

Collecting means for collecting used oil that has flowed out of an industrial machine, mixing means for mixing used oil supplied from the collecting means and unused fresh oil, and mixed oil mixed by the mixing means A filtering means for filtering, and a supplying means for supplying the filtered mixed oil filtered by the filtering means to the industrial machine again. The industrial machine is composed of a kneader for kneading rubber and is used as a fresh oil. In a used oil recycling apparatus that uses process oil to supply the filtered mixed oil as a process oil to a rubber kneading chamber of a kneader by a supply means, used oil supplied from the recovery means, Submixing means for mixing lubricating oil as unused fresh oil, and mixing mixed by the submixing means And a sub-feeding means for filtering the oil, and a sub-feeding means for supplying the filtered mixed oil filtered by the sub-filtering means to the sealing mechanism of the rotor shaft of the kneader again. A used oil recycling apparatus , wherein filtered mixed oil can be switched and supplied to at least one of shaft sealing mechanisms .

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