JP3987678B2 - Method and apparatus for regenerating degraded hydraulic fluid in hydraulic system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for regenerating a deteriorated hydraulic fluid in a hydraulic device capable of efficiently removing a deteriorated substance from the used or used hydraulic fluid recovered in an oil tank of the hydraulic device.
[0002]
[Prior art]
For example, the hydraulic fluid that activates a hydraulic device such as a hydraulic cylinder is usually a filter type because there is a risk of contamination of the hydraulic device due to contamination of dust and dirt when used for a long time. Contaminants are removed by a contaminant removing device such as a cleaner. On the other hand, the contamination of the hydraulic fluid is not only a contaminant, but also a deterioration phenomenon of the hydraulic fluid itself. Since such a deteriorated substance is mainly phosphoric acid, it causes corrosion of various equipment such as pipes and coolers. It was. Therefore, as shown in FIG. 3, as a device for regenerating the deteriorated hydraulic fluid, the deteriorated hydraulic fluid is passed through the activated clay 31 layered in the septic tank 30 and adsorbed to the lower container 32. What you have received is known.
[0003]
However, since this type is a natural drop method, the pressure loss is large, the processing speed is slow, and the equipment becomes large, and the processing efficiency is remarkably inferior because it is processed in a separate line. There was a point. In addition, attempts have been made to reduce the size of such a natural fall processing device into the line, but in this case, a dedicated pump for supplying pressure oil is required to cover the pressure loss. Since the pump can be installed only on the rear side of the contaminant removal device, the problem is that contaminants are generated from the adsorbent of the processing device due to the influence of this dedicated pump and the purification level is lowered. was there. Further, although an adsorption treatment using an ion exchange resin is also conceivable, it has not been practically used because it is necessary to simultaneously remove water and the treatment cost is high.
[0004]
[Problems to be solved by the invention]
The present invention solves the conventional problems as described above, and accurately causes deteriorated substances and contaminants in the used or used hydraulic fluid recovered in the oil tank in the circulation line connected to the oil tank. The present invention has been completed for the purpose of providing a method and an apparatus for regenerating deteriorated hydraulic fluid in a hydraulic apparatus that can be removed and that can be processed at low cost.
[0005]
[Means for Solving the Problems]
The present invention, which has been made to solve the above problems, purifies and reuses the used or used hydraulic fluid recovered in the oil tank while passing through the circulation line connected to the oil tank. A method for regenerating a deteriorated hydraulic fluid in a hydraulic device, wherein a dedicated pump is used to place phosphoric acid in the used or used hydraulic fluid passing through the circulation line in front of the contaminant removal device. Adsorbing and removing in an upward flow type phosphoric acid content adsorbing device that uses a pump of the contaminant removing device without pressure and adsorbs at a pressure loss of 9.8 KPa or less, and then removes the contaminant. A method for regenerating a deteriorated hydraulic fluid in a hydraulic device characterized in that the invention relates to claim 1, and the adsorption treatment of phosphoric acid in the invention according to claim 1 is performed with an activity of 1 to 6 mm in particle size. Alumina particles or Using the phosphoric acid adsorption device filled in the container so that the charcoal particles have a porosity of 0.4 to 0.6, the used or used hydraulic fluid averages the phosphoric acid adsorption device. The invention according to claim 2 is a method for regenerating deteriorated hydraulic fluid in a hydraulic device that passes at a flow rate of 2 mm / s or less.
In addition, the contaminant removal device pump is used in the circulation line that circulates the used or used hydraulic fluid that is connected to the oil tank of the hydraulic device, and is located in front of the contaminant removal device without using a dedicated pump. In the hydraulic system, the upward flow-type phosphoric acid content adsorbing device controlled so that the pressure loss becomes 9.8 KPa or less and the contaminant removing device are sequentially incorporated in series. The regenerating apparatus for hydraulic fluid is an invention according to claim 3, and the phosphoric acid content adsorbing apparatus according to the invention according to claim 3 is made of activated alumina particles or activated carbon particles having a particle diameter of 1 to 6 mm with a porosity of 0.4 to 0.4. According to a fourth aspect of the present invention, there is provided a regeneration device for a deteriorated hydraulic fluid in a hydraulic device that is filled in a container so as to be 0.6.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawing shows a case where a workpiece 21 is operated by a hydraulic device 20 such as a hydraulic cylinder. In the figure, 1 is an oil tank connected to the hydraulic device 20 via a switching valve 2, and 3 is an oil tank 1 described above. An attached regeneration line for used hydraulic fluid that has been used or used, and 2a is a relief valve for ensuring the safety of the switching valve 2.
[0007]
In the present invention, a phosphoric acid content adsorption device 4 and a contaminant removal device 5 are sequentially arranged in series on the regeneration line 3, and the phosphoric acid content adsorption device 4 has a pressure loss of 9.8 KPa or less. It is controlled as follows. The contaminant removing device 5 is of a general type that has been conventionally used.
With such a configuration, since the pressure loss is small and a dedicated pump for supplying pressure oil is not required, it is possible to install it in the front stage of the contaminant removal device in position, and as a result, as described above, The problem that contaminants are generated from the adsorbent of the adsorption device due to the influence of the dedicated pump and the degree of purification is reduced can be solved.
[0008]
As shown in FIG. 2, the phosphoric acid content adsorption device 4 holds an adsorbent 4c made of activated alumina particles or activated carbon particles in an airtight container body 4a by an adsorbent holding member 4b such as a synthetic resin net. It is what was filled. The supply port 4d for the hydraulic fluid used or used is formed in the lower part of the sealed container body 4a, and the discharge port 4e is formed in the upper part of the sealed container body 4a, without using a dedicated pump. In addition, it is possible to fill the hermetic container with a hydraulic working fluid and to prevent poor circulation due to air suction. In addition, the activated alumina particles or activated carbon particles that are the adsorbent 4c are excellent in mechanical strength, so that they are not destroyed during the treatment and dust is not generated, and a stable adsorption treatment is possible.
[0009]
The activated alumina particles or the activated carbon particles are filled in the sealed container main body 4a so that the particle diameter is in the range of 1 to 6 mm and the porosity is 0.4 to 0.6. The average oil flow velocity in the adsorption device 4 is adjusted to be 2 mm / s or less. As a result of this adjustment, the pressure loss of the deteriorated hydraulic fluid in the phosphoric acid content adsorption device 4 is 9.8 KPa or less, and the pressure loss is small as described above, and a dedicated pump for supplying pressure oil is unnecessary. Thus, the phosphoric acid content adsorbing device 4 can be provided in the front stage of the contaminant removing device 3 in terms of position.
The reason why the particle size is in the range of 1 to 6 mm is that the handleability is inferior when it is less than 1 mm, whereas the adsorption capacity is inferior when it is greater than 6 mm, and the porosity is 0.4 to 0. The reason why it was set to 6 is that when it is less than 0.4, it becomes difficult to control the pressure loss to 9.8 KPa or less, and when it is more than 0.6, the adsorption capacity is lowered.
[0010]
In this configuration, the used or used hydraulic fluid sent from the oil tank 1 sequentially passes through the regeneration line 3 in which the phosphoric acid content adsorption device 4 and the contaminant removal device 5 are sequentially incorporated in series. Since the phosphoric acid adsorption process in the phosphoric acid content adsorbing device 4 is performed so that the pressure loss is 9.8 KPa or less, the pressure loss is small and the pressure oil is supplied. This eliminates the need for a dedicated pump, and makes it possible to provide the phosphoric acid content adsorbing device 4 in front of the contaminant removal device 3 without generating impurities from the adsorbent 4c and reducing the degree of purification. In addition, even if foreign matter is generated from the phosphoric acid content adsorption device 4 for some reason, it is removed by the foreign matter removal device 3. Therefore, the purification process can be performed stably and inexpensively over a long period of time, and the replacement frequency of the hydraulic fluid can be greatly reduced.
[0011]
【The invention's effect】
As is clear from the above description, the present invention can accurately remove the deteriorating substances and contaminants in the used hydraulic fluid in the same circulation line, and the processing cost is low. It can be.
Therefore, the present invention greatly contributes to the development of the industry as a method and apparatus for regenerating deteriorated hydraulic fluid in a hydraulic apparatus that has eliminated the conventional problems.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory diagram showing a process flow of an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a phosphoric acid content adsorption apparatus of the present invention.
FIG. 3 is a cross-sectional view showing a conventional adsorption device.
[Explanation of symbols]
3 Regeneration line 4 Phosphate adsorption device 5 Contaminant removal device

Claims (4)

A method for regenerating a deteriorated hydraulic fluid in a hydraulic device that is used to purify and reuse the used or used hydraulic fluid recovered in the oil tank while passing through a circulation line connected to the oil tank. The phosphoric acid content in the used or used hydraulic fluid that passes through the circulation line is located in the front stage of the contaminant removal device, and the contaminant removal device pump is used without using the dedicated pump. Deteriorated hydraulic operation in a hydraulic device characterized by removing impurities after adsorbing and removing in an upflow type phosphoric acid content adsorbing device adapted to adsorb at a pressure loss of 9.8 KPa or less Liquid regeneration method.   Adsorption treatment of phosphoric acid is used using a phosphoric acid adsorption device in which a container is filled so that activated alumina particles or activated carbon particles having a particle diameter of 1 to 6 mm have a porosity of 0.4 to 0.6. The method for regenerating a deteriorated hydraulic fluid in a hydraulic device according to claim 1, wherein middle or used hydraulic fluid is passed through the phosphoric acid content adsorption device at an average flow velocity of 2 mm / s or less. In the circulation line that circulates the used or used hydraulic fluid connected to the oil tank of the hydraulic device, it is located in the front stage of the contaminant removal device and uses the contaminant removal device pump instead of the dedicated pump. Deteriorated hydraulic operation in a hydraulic system, characterized in that an upward flow type phosphoric acid content adsorbing device controlled so as to have a loss of 9.8 KPa or less and a contaminant removing device are sequentially incorporated in series. Liquid regeneration device.   The hydraulic apparatus according to claim 3, wherein the phosphoric acid component adsorbing device is one in which a container is filled with activated alumina particles or activated carbon particles having a particle diameter of 1 to 6 mm so that the porosity is 0.4 to 0.6. Regeneration device for deteriorated hydraulic fluid.

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