JP2013111540A - Liquid cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately determine whether an unnecessary object adhering to a rotation member of a liquid cleaning apparatus is sufficiently scraped by a scraper or not, and to suitably determine the time for replacement of the scraper or the rotation member.SOLUTION: This apparatus includes rotation number detection parts 21 and 22 detecting a rotation number of an endless belt 3 (rotation member) and a driving part 5, and a rotation number of an upper side pulley 2 with respect to the rotation number of the driving part 5 is monitored based on the detection result, and it is determined whether the unnecessary object D is suitably scraped from the endless belt 3 by the scraper 4 or not.

Description

  The present invention relates to a liquid purification apparatus that removes unnecessary substances floating on a liquid surface.

  In a processing apparatus that performs machining such as cutting, coolant for cooling a tool may be circulated and reused. In this case, since unnecessary materials such as lubricating oil and processing waste of the processing apparatus are mixed in the coolant, it is necessary to remove the unnecessary materials in order to reuse the coolant.

  An oil skimmer is widely known as a liquid purification device that removes unnecessary substances such as oil floating on the liquid surface (for example, Patent Document 1). For example, as shown in FIG. 4, the oil skimmer includes a pair of pulleys 101 and 102 that are spaced apart from each other, an endless belt 103 wound between them, and a scraper 104. The upper pulley 101 is provided above the liquid surface and is attached to a drive motor (not shown) fixed to the lid of the liquid container. The lower pulley 102 is immersed in the coolant C inside the container as a weight, whereby a constant tension is applied to the endless belt 103. When the endless belt 103 is rotated by driving the upper pulley 101 to rotate, the oil on the liquid surface of the coolant C adheres to the endless belt 103. Specifically, when the endless belt 103 enters the coolant C (see arrow A) and when the endless belt 103 is discharged from the coolant C (see arrow B), the oil that floats on the surface of the coolant C is unnecessary. The object D adheres to the endless belt 103. In this way, the unnecessary material D adhering to the endless belt 103 is scraped off by the scraper 104, whereby the unnecessary material D is removed from the liquid surface of the coolant C.

  As shown in FIG. 5 (a), the scraper 104 has a sharp tip 104a, and the tip 104a is brought into contact with the endless belt 103, thereby scraping off unnecessary matter attached to the endless belt 104 (see FIG. 5A). (See dotted line in the figure).

JP 2000-246006 A

  When the oil skimmer as described above is used for a long period of time, the tip 104a of the scraper 104 is worn as shown in FIG. 5 (b). There is a risk that the collection efficiency of the object may be lowered. For this reason, it is necessary to periodically check the worn state of the scraper 104 and replace the scraper 104 if the wear has progressed. However, since the present situation is that the confirmation of the wear state is performed by the operator's visual observation, it takes time for the confirmation work and it is difficult to confirm the wear state accurately by visual inspection. For this reason, the replacement time of the scraper 104 cannot be properly determined, and the replacement time is too early, resulting in unnecessary costs, or the replacement time is too late and the waste material may be used with poor recovery efficiency. There is.

  The problem to be solved by the present invention is to simply and accurately confirm the wear state of the scraper of the liquid purification apparatus.

  The present invention made to solve the above-mentioned problems is a liquid purification device for removing unnecessary substances floating on the liquid surface, wherein the rotating member has a lower end immersed in the liquid and an upper end exposed from the liquid surface. A scraper that scrapes off unnecessary matter adhering to the rotating member, and a driving unit that contacts the leading side in the rotational direction of the rotating member and rotates the rotating member via a frictional force. The present invention is characterized in that a detection means for detecting at least one rotation state of the part and a determination part for determining whether or not the drive part is idle based on a detection result of the detection means are provided.

  As described above, when the driving unit that rotates the rotating member via the frictional force is provided on the leading side in the rotation direction with respect to the scraper, if the scraper removes enough unnecessary material attached to the rotating member, the driving unit and Since an unnecessary object is present between the rotating member and the frictional force between the two members, the driving unit is idled and the rotation state (for example, the number of rotations) of the driving unit and the rotating member changes. Therefore, a detection unit that detects the rotational state of at least one of the drive unit and the rotation member is provided, and by determining whether the drive unit is idle based on the detection result of the detection unit, an unnecessary object attached to the rotation member is detected. It is possible to accurately determine whether or not the scraper is sufficiently scraped off, that is, whether or not the amount of wear of the scraper is within an allowable range.

  By the way, when only one of the rotation number detection unit for detecting the rotation number of the rotating member or the rotation number detection unit for detecting the rotation number of the drive unit is provided as the detection unit, the drive unit is idle. Even when the rotation is not performed, the rotational speed of the rotating member and the drive unit may be decreased or increased together for some reason, which may erroneously determine that the drive unit is idle. Therefore, in order to accurately detect the idling of the drive unit, a rotation number detection unit that detects the rotation number of the rotating member and a rotation number detection unit that detects the rotation number of the drive unit are provided, and the rotation number of the drive unit is provided. It is preferable to determine whether or not the drive unit is idle based on the number of rotations of the rotating member with respect to.

  As described above, according to the liquid purification apparatus of the present invention, it is possible to easily and accurately confirm the wear state of the scraper as compared with the case of visual observation by the operator.

It is sectional drawing of the liquid purification apparatus which concerns on one Embodiment of this invention. It is a side view of the said liquid purification apparatus. It is an enlarged view of the front-end | tip of the scraper of the said liquid purification apparatus. It is sectional drawing of the conventional oil skimmer. (A) is an enlarged view of the tip of the scraper of the oil skimmer, and (b) is an enlarged view showing a state where the tip of the scraper is worn.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a liquid purification apparatus 100 according to an embodiment of the present invention. The liquid purifying apparatus 100 removes unnecessary substances D such as oil and processing waste floating on the liquid level of the coolant C filled in the container in order to circulate and use the coolant of the processing apparatus. The liquid purification apparatus 100 mainly includes a pair of pulleys 1 and 2, an endless belt 3 as a rotating member wound around the pulleys 1 and 2, a scraper 4, and a drive unit 5 that rotates the endless belt 3. . The pair of pulleys 1 and 2 and the endless belt 3 are a movable side 10 that moves up and down as the liquid level fluctuates, and the scraper 4 and the drive unit 5 are fixed to a grounded equipment side. Is fixed to a lid portion (not shown) of the container filled with.

  The lower pulley 1 is at least partially immersed in the liquid, and the upper pulley 2 is disposed at a position above the liquid surface and not in contact with the liquid. Thereby, the lower end of the endless belt 3 wound around the pair of pulleys 1 and 2 is immersed in the liquid, and the upper end is exposed from the liquid surface. The endless belt 3 is formed of a material capable of adsorbing unnecessary materials, for example, metal.

  The scraper 4 has no flat plate shape and has a sharp tip 4a as shown in FIG. By scraping the tip 4a of the scraper 4 against the outer circumferential surface of the endless belt 3, unnecessary materials such as oil adhering to the endless belt 3 are scraped off from the endless belt 3 and stored in a separation container (not shown). reference). In this embodiment, the scraper 4 that slides with the outer peripheral surface of the endless belt 3 is provided, but in addition to or instead of this, a scraper that slides with the inner peripheral surface of the endless belt 3 is provided. May be. Further, the number of scrapers is not limited, and for example, a plurality of scrapers that slide on the outer peripheral surface of the endless belt 3 may be provided at a plurality of locations separated in the rotation direction of the endless belt 3.

  The drive unit 5 rotates the endless belt 3 through frictional force, and is disposed on the rotation direction leading side (lower side in the figure) of the endless belt 3 with respect to the scraper 4 and contacts the outer peripheral surface of the endless belt 3. (See FIG. 1). In the present embodiment, the drive unit 5 includes a columnar magnet pulley 5a and a drive motor 5b that rotationally drives the magnet pulley 5a. The outer peripheral surface of the magnet pulley 5a is attracted to the endless belt 3 by magnetic force, and the endless belt 3 is rotated by rotating the drive motor 5b in this state. If the frictional force between the drive unit 5 and the endless belt 3 is sufficient without using magnetic force, a normal pulley having no magnetic force may be used instead of the magnet pulley 5a.

  The liquid purification apparatus 100 is provided with detection means for detecting the rotational state of at least one of the endless belt 3 and the drive unit 5. In the present embodiment, as shown in FIG. 2, a rotation speed detection unit 21 that detects the rotation speed of the upper pulley 2 is provided as detection means for detecting the rotation state of the endless belt 3. In addition, a rotation number detection unit 22 that detects the rotation number of the drive unit 5 is provided as a detection unit that detects the rotation state of the drive unit 5.

  The pair of pulleys 1 and 2 are connected by a connecting shaft 6. Specifically, the bearings 7 provided on both sides of the lower pulley 1 in the rotation axis direction and the bearings 8 provided on both sides of the upper pulley 2 in the rotation axis direction are respectively connected by the connecting shaft 6. The intermediate portion of the connecting shaft 6 is guided in the vertical direction by the guide bush 9. The guide bush 9 is fixed to the equipment side, and specifically, is fixed to the lid portion of the container that stores the liquid. As described above, the pair of pulleys 1 and 2 and the endless belt 3 are integrated by the connecting shaft 6 to constitute the movable side 10 that can be moved up and down.

  The liquid purification apparatus 100 is provided with buoyancy generating means for floating the endless belt 3 on the liquid surface. In the present embodiment, the lower pulley 1 is hollow and is immersed in a liquid to constitute a buoyancy generating means. Specifically, as shown in FIG. 1, the lower pulley 1 includes a hollow cylindrical portion 1 a and a pair of disk portions 1 b that closes both end openings of the cylindrical portion 1 a. In the present embodiment, the upper pulley 2 is similarly hollow, and includes a cylindrical portion 2a and a pair of disk portions 2b.

  The movable side 10 is supported upward by buoyancy generated by immersing the lower pulley 1 in the liquid. That is, the movable side 10 floats on the liquid surface at a position where the weight of the movable side 10 and the buoyancy by the lower pulley 1 are balanced. As a result, the movable side 10 can move up and down as the liquid level changes, and the immersion depth of the lower pulley 1 relative to the liquid level, that is, the immersion depth of the endless belt 3 is always maintained constant.

  In the liquid purifying apparatus 100 described above, the endless belt 3 is rotated by the drive unit 5 and the endless belt 3 is allowed to pass through the coolant C, whereby the liquid level unwanted matter D is adhered to the endless belt 3. Then, the unnecessary material D is removed from the liquid surface of the coolant C by scraping the unnecessary material D from the endless belt 3 with the scraper 4. At this time, the rotational speed of the upper pulley 2 and the rotational speed of the drive unit 5 are detected by the rotational speed detection units 21 and 22, respectively, and the detection result is transmitted to a determination unit (not shown). The determination unit monitors the number of rotations of the upper pulley 2 with respect to the number of rotations of the drive unit 5 based on the detection results by the rotation number detection units 21 and 22. If the scraper 4 does not sufficiently remove the unwanted material D from the endless belt 3 due to wear of the scraper 4, and the unwanted material D is interposed between the magnet roller 5a of the drive unit 5 and the endless belt 3, the drive unit 5 idles, and the rotational speed of the upper pulley 2 with respect to the rotational speed of the drive unit 5 decreases. Accordingly, when the rotational speed of the upper pulley 2 with respect to the rotational speed of the drive unit 5 becomes smaller than a predetermined value, the determination unit determines that the drive unit 5 is idle. Accordingly, it can be confirmed that the wear amount of the tip 4a of the scraper 4 exceeds the allowable range, and the drive unit 5 is stopped and the scraper 4 is replaced.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the rotational speed of the upper pulley 2 and the rotational speed of the driving unit 5 are detected by the rotational speed detection units 21 and 22 has been described, but the present invention is not limited thereto. For example, only the rotation speed detection unit 21 that detects the rotation speed of the upper pulley 2 may be provided. In this case, if the drive unit 5 is idle, the drive force of the drive unit 5 is not sufficiently transmitted to the endless belt 3 and the rotational speed of the upper pulley 2 is reduced, so that the rotational speed of the upper pulley 2 falls below a predetermined value. Then, it can be determined that scraping by the scraper 4 is insufficient. Or you may provide only the rotation speed detection part 32 which detects the rotation speed of the drive part 5. FIG. In this case, when the drive unit 5 is idle, the load applied to the drive unit 5 is reduced and the rotational speed of the drive unit 5 is increased. Therefore, when the rotational speed of the drive unit 5 exceeds a predetermined value, scraping by the scraper 4 is performed. It can be determined that it is insufficient. However, in order to accurately detect the idling of the drive unit 5, both the rotation speed detection units 21 and 22 are provided as in the above embodiment, and the upper pulley with respect to the rotation speed of the drive unit 5 is determined by the determination unit. It is preferable to monitor the rotational speed of 2.

  In the above-described embodiment, the case where the rotation speed detection units 21 and 22 for detecting the rotation speed are provided as detection means for detecting the rotation state of the upper pulley 2 and the drive unit 5 has been described. Instead, for example, the detection means may be configured by a torque detection unit that detects the rotational torque of the upper pulley 2 or the drive unit 5. Further, instead of detecting the rotational state of the upper pulley 2, the rotational state of the lower pulley 1 may be detected, or the rotational state of the endless belt 3 may be directly detected.

  In the above embodiment, the belt-type oil skimmer in which the rotating member is the endless belt 3 is shown. However, the present invention is not limited to this. For example, the disk-type oil skimmer in which the rotating member is a disk having a horizontal rotating shaft. It may be. Further, the present invention is not limited to the oil skimmer, but can be applied to a foreign matter removing apparatus that removes foreign matter floating on the liquid surface.

  In the above embodiment, the movable side 10 is floated on the liquid surface. However, the present invention is not limited to this. For example, the upper pulley 2 is fixed to the equipment side, and the lower pulley 1 is connected to the endless belt 3. You may suspend through.

1 Pulley 2 Pulley 3 Endless belt (Rotating member)
4 Scraper 5 Drive unit 21 Rotational speed detection unit (detection means)
22 Rotation speed detector (detection means)
C Coolant D Unnecessary

Claims (1)

A liquid purification device that removes unnecessary substances floating on the liquid surface,
A rotating member whose lower end is immersed in a liquid and whose upper end is exposed from the liquid surface, a scraper that scrapes off unnecessary materials attached to the rotating member, and the rotating member that is in contact with the leading side in the rotational direction of the scraper. A drive unit that rotates the rotating member via a frictional force,
A detection unit that detects a rotation state of at least one of the rotating member and the driving unit, and a determination unit that determines whether the driving unit is idle based on a detection result of the detection unit. Liquid purification device.

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