Coolant treatment equipment

Abstract

In a coolant treatment device that removes magnetic material from used coolant, problems such as overflow of coolant due to stopping of a rotating drum are prevented. The device includes a rotating drum (2) on which a plurality of magnets are arranged, and a rotation detector (10) that detects abnormal rotation of the rotating drum (2).

Description

[Technical Field]

[0001] The present invention relates to a coolant treatment device for removing magnetic substances such as metal components contained in used coolant. [Background technology]

[0002] Metalworking machines include those that cut magnetic metals, and these machines use coolant (cooling fluid). Used coolant is recovered as coolant containing cutting chips. The recovered used coolant is reused by separating the cutting chips. Known devices for separating cutting chips from coolant include coolant treatment devices that use magnets to separate magnetic materials such as cutting chips from coolant. For example, Patent Document 1 describes a rotating drum-type magnetic separation device that includes a rotating drum with multiple magnets and separates cutting chips from used coolant. In the rotating drum-type magnetic separation device, the magnetic force of the rotating drum acts to separate or collect the cutting chips as the used coolant passes between the rotating drum and a bottom plate arranged along the rotating drum. Sprockets are also provided on both ends of the rotating drum to transmit the rotation of the motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-184241 Summary of the Invention [Problem to be solved by the invention]

[0004] If a problem occurs, such as a broken sprocket on the rotating drum, the rotating drum may stop rotating or may not rotate properly. If coolant is supplied to the coolant treatment device while the rotating drum is stopped, magnetic material accumulates between the rotating drum and the bottom plate, stopping the flow of coolant. If coolant continues to be supplied to the coolant treatment device, problems such as the coolant not being discharged from the coolant treatment device's outlet and overflowing from the top of the coolant treatment device's main body may occur. If coolant overflows, it contaminates the inside and surrounding areas of the coolant treatment device, requiring a great deal of effort for cleaning.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to prevent problems such as overflow of coolant liquid due to stopping of the rotating drum in a coolant treatment device that removes magnetic material from used coolant liquid. [Means for solving the problem]

[0006] After extensive research into the above-mentioned problems, the inventor discovered that in a coolant treatment device that removes magnetic material from used coolant, by detecting abnormal rotation of the rotating drum, it is possible to immediately discover abnormal stopping of the rotating drum and prevent problems such as coolant overflow from occurring, and thus completed the present invention. That is, the present invention provides the following coolant treatment device.

[0007] The coolant treatment device of the present invention, which solves the above problems, is a coolant treatment device that removes magnetic materials from used coolant liquid, and is characterized by comprising a rotating drum on which multiple magnets are arranged, and a rotation detector that detects abnormal rotation of the rotating drum. This coolant treatment device is equipped with a rotation detector that detects abnormal rotation of the rotating drum, so that abnormal stopping of the rotating drum can be immediately detected, thereby preventing problems such as coolant overflow.

[0008] In one embodiment of the coolant treatment device of the present invention, the coolant treatment device has a main body that houses a rotating drum therein, and the rotation detector is installed outside the main body. According to this feature, since the rotation detector is disposed outside the main body of the coolant processing device, contamination of the rotation detector with the coolant liquid is prevented, and rotation abnormalities can be accurately detected.

[0009] In one embodiment of the coolant treatment device of the present invention, the coolant treatment device comprises a rotating drum and a driven rotating body that rotates in conjunction with the rotating drum, and the rotation detector detects abnormal rotation of the driven rotating body and thereby detects abnormal rotation of the rotating drum. According to this feature, the rotation detector detects abnormal rotation of the driven rotor and indirectly detects abnormal rotation of the rotating drum. During operation of the coolant treatment device, approximately half of the lower side of the rotating drum is immersed in coolant. Therefore, if the rotation detector were installed on the rotating drum, there is a risk that the rotation detector would be contaminated by the coolant. Therefore, by installing the driven rotor in a location where it is less likely to be contaminated and indirectly detecting abnormal rotation of the rotating drum, contamination of the rotation detector by the coolant is prevented, and abnormal rotation can be accurately detected.

[0010] In one embodiment of the coolant treatment device of the present invention, the coolant treatment device is equipped with a rotating drum and a squeeze roller that rotates in conjunction with the rotating drum, and the rotation detector detects abnormal rotation of the squeeze roller and thereby detects abnormal rotation of the rotating drum. According to this feature, the rotation detector detects abnormal rotation of the squeezing roller, thereby indirectly detecting abnormal rotation of the rotating drum. During operation of the coolant treatment device, approximately half of the lower side of the rotating drum is immersed in the coolant. Meanwhile, the squeezing roller is installed above the coolant surface. Therefore, by having the rotation detector detect abnormal rotation of the squeezing roller, and thus indirectly detecting abnormal rotation of the rotating drum, contamination of the rotation detector by the coolant is prevented, and rotation abnormalities can be accurately detected.

[0011] In one embodiment of the coolant treatment device of the present invention, the coolant treatment device is equipped with an inflow rate adjustment means for adjusting the inflow rate of coolant liquid flowing into the main body, and the inflow rate adjustment means has the characteristic of controlling the inflow rate in accordance with abnormal rotation of the rotating drum detected by a rotation detector. According to this feature, when the rotation of the rotating drum stops, the amount of coolant flowing into the main body can be immediately reduced or stopped, thereby preventing the coolant from overflowing. In addition, if the rotation speed of the rotating drum drops due to an abnormal rotation, the coolant treatment device will be less effective at removing magnetic material. However, by reducing the amount of coolant flowing into the main body, the coolant will take longer to pass between the rotating drum and the base plate, allowing the magnetic material to be sufficiently removed from the coolant.

[0012] In one embodiment of the coolant treatment device of the present invention, the coolant treatment device comprises a supply flow path for supplying coolant liquid to the main body, an avoidance flow path branching from the supply flow path for avoiding the supply of coolant liquid to the main body, and a switching valve for switching between the supply flow path and the avoidance flow path, and the switching valve has the characteristic of switching the flow path in response to abnormal rotation of the rotating drum detected by a rotation detector. According to this feature, since a switching valve is provided that switches the flow path through which the coolant passes from the supply flow path to the bypass flow path, the supply of coolant to the main body can be stopped quickly with a simple operation. Also, by supplying the coolant that has been prevented from being supplied to the main body by the bypass flow path to another magnetic material removal device such as a filtration device, it is possible to prevent the overflow of coolant without stopping the operation of the entire coolant treatment system.

[0013] In one embodiment of the coolant processing device of the present invention, the coolant processing device is characterized by having a control unit that classifies data obtained from a rotation detector into two or more data categories and performs processing according to each data category. According to this feature, for example, the data on abnormal rotation detected by the rotation detector can be divided into a data section indicating a state in which the rotation speed of the rotating drum has decreased and a data section indicating a state in which the rotating drum has stopped, and processing can be performed according to each data section, such as controlling the inflow of used coolant liquid into the main body to decrease in the data section indicating a state in which the rotation speed has decreased, or stopping the supply of used coolant liquid to the main body in the data section indicating a state in which the rotation has stopped. This makes it possible to continue operating the coolant treatment device as long as possible while preventing problems such as coolant liquid overflow. [Effects of the Invention]

[0014] According to the present invention, in a coolant treatment device that removes magnetic material from used coolant, problems such as coolant overflow due to stopping of the rotating drum can be prevented. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic explanatory diagram showing the internal structure of a coolant treatment device according to a first embodiment of the present invention; [Figure 2] 1 is a schematic explanatory diagram showing the external structure of a coolant treatment device according to a first embodiment of the present invention; [Figure 3] 3 is a schematic explanatory diagram illustrating the structure of a rotation detector of a coolant processing device according to a first embodiment of the present invention, and is a cross-sectional view taken along dashed line AA in FIG. 2, viewed from the direction of the black arrow. [Figure 4] FIG. 3 is a flowchart illustrating an example of control by a control unit of the coolant processing device according to the first embodiment of the present invention. [Figure 5] 1 is a schematic explanatory diagram showing the structure of a coolant liquid treatment system equipped with a coolant treatment device according to a first embodiment of the present invention; [Figure 6] FIG. 4 is a schematic explanatory view showing the external structure of a coolant treatment device according to a second embodiment of the present invention. [Figure 7]7 is a schematic explanatory diagram illustrating the structure of a rotation detector of a coolant processing device according to a second embodiment of the present invention, and is a cross-sectional view taken along dashed line BB in FIG. 6, viewed from the direction of the black arrow. DETAILED DESCRIPTION OF THE INVENTION

[0016] Coolant is a cooling liquid supplied to metal cutting machines and the like that use magnetic metals as the cutting material. When used as a coolant in metal cutting machines and the like, the coolant is discharged as used coolant containing magnetic materials such as magnetic sludge. The coolant treatment device of the present invention recovers magnetic materials such as magnetic sludge contained in the used coolant using magnetic force. There are no particular limitations on the used coolant, as long as it is a liquid that contains magnetic materials, and it may be an oil-based liquid or a water-soluble liquid.

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. [First embodiment] FIG. 1 shows the internal structure of a coolant treatment device 100 according to a first embodiment of the present invention. The coolant treatment device 100 of the present invention comprises a main body 1 made of a rectangular housing, a rotating drum 2 suspended across the width of the main body 1 (the direction perpendicular to the plane of the paper in FIG. 1), and a squeezing roller 8 that rotates in contact with the rotating drum 2. The main body 1 comprises an inlet section 5 through which coolant containing magnetic sludge (magnetic material) flows into the main body 1, a treated liquid discharge section 6a through which the treated liquid from which the magnetic sludge has been removed is discharged, and a magnetic material discharge section 6b through which the magnetic sludge is discharged. The rotating drum 2 is disposed between the inlet section 5 and the treated liquid discharge section 6a.

[0018] A bottom plate 1a formed to fit the shape of the rotating drum 2 is provided at the bottom of the main body 1, and a liquid reservoir 1b is formed to store the coolant. Coolant supplied to the main body 1 by a pump or the like flows in through the inlet 5, is temporarily stored in the liquid reservoir 1b, and then passes between the rotating drum 2 and the bottom plate 1a. As the coolant passes between the rotating drum 2 and the bottom plate 1a, the magnetic flux of the rotating drum 2 causes magnetic sludge contained in the coolant to adhere to the rotating drum 2. The treated liquid from which the magnetic sludge has been removed by the rotating drum 2 flows over the bottom plate 1a and is discharged from the treated liquid discharge section 6a.

[0019] Furthermore, a flow straightening wall 9 is installed inside the main body 1 at a distance from the inlet 5. The flow straightening wall 9 is made of a plate material suspended from the top surface of the main body 1, and its lower end is located below the surface of the coolant stored in the liquid reservoir 1b. The flow velocity of the inflowing coolant increases as it passes between the flow straightening wall 9 and the bottom plate 1a, so the flow straightening wall 9 has the effect of suppressing the accumulation of magnetic sludge at the bottom of the liquid reservoir 1b.

[0020] <Rotating drum> The rotating drum 2 magnetically attracts the magnetic sludge and separates it from the coolant. The rotating drum 2 is supported on a shaft that is approximately horizontal and perpendicular to the flow of the coolant. The rotating drum 2 is also installed so that approximately half of its lower side is immersed below the surface of the coolant, and approximately half of its upper side is above the surface.

[0021] The rotating drum 2 comprises two cylindrical bodies, an inner cylinder 2a and an outer cylinder 2b, and a plurality of magnets 3 are fixed to the outer periphery of the inner cylinder 2a. The plurality of magnets 3 exert a predetermined magnetic force on the outer periphery of the outer cylinder 2b, thereby magnetically attracting the magnetic sludge to the outer periphery of the outer cylinder 2b. The two cylindrical bodies are made of a non-magnetic material such as stainless steel, and do not generate magnetic force.

[0022] The rotating drum 2 can set the range over which magnetic force is applied to the outer peripheral surface of the outer cylinder 2b by arranging the magnets 3 fixed to the outer periphery of the inner cylinder 2a. The range over which magnetic force is applied to the outer peripheral surface of the outer cylinder 2b is appropriately designed depending on the outer diameter of the rotating drum 2, the position of the scraper 7, etc. As shown in FIG. 1, in the coolant treatment device 100 of the first embodiment, magnets are arranged over approximately ¾ of the outer peripheral surface of the inner cylinder 2a. That is, magnetic force is applied to approximately ¾ of the outer peripheral surface of the outer cylinder 2b from the portion immersed in the liquid reservoir 1b of the rotating drum 2 to the top. Furthermore, no magnets are arranged in the remaining approximately ¼ of the outer peripheral surface of the inner cylinder 2a, and no magnetic force is applied to the remaining approximately ¼ of the outer peripheral surface of the outer cylinder 2b (near the scraper 7).

[0023] Next, a means for fixing the rotating drum 2 to the main body 1 will be described with reference to Fig. 3. Note that in Fig. 3, the area of ​​the rotating drum 2 is shown in cross section of the rotating drum 2, rather than the cross section taken along dashed line AA in Fig. 2. As shown in Fig. 3, the rotating drum 2 has a drum shaft 2c as its central axis, and the drum shaft 2c is fixed to a base 1c protruding from the inner wall of the main body 1 by a fixing member such as a bolt.

[0024] The inner cylinder 2a (the inner cylinder 2a and magnet 3 are not shown in Figure 3) is directly fixed to the drum shaft 2c. On the other hand, the outer cylinder 2b has end disks 2f fixed to both ends, and the center of the end disks 2f is provided with bearings 2d, such as ball bearings. The outer cylinder 2b is then mounted on the drum shaft 2c via the bearings 2d.

[0025] In addition, a drive sprocket that transmits the driving force of the motor 4 is fixed to the outside (side wall side of the main body 1) of one end disk 2f (the end disk opposite the end disk shown in Figure 3, not shown), and a driven sprocket 2e that transmits the power of the motor 4 to the squeezing roller 8 is fixed to the outside (side wall 1d side of the main body 1) of the other end disk 2f (end disk shown in Figure 3).

[0026] The drive sprocket (not shown) is connected to the motor 4 via a chain, and the driving force of the motor 4 is transmitted to the outer cylinder 2b of the rotating drum 2 via the chain, drive sprocket, and end disk. This causes the outer cylinder 2b of the rotating drum 2 to rotate. The direction of rotation of the outer cylinder 2b is opposite to the flow of the coolant liquid passing underneath (counterclockwise as viewed from the plane of FIG. 1). The driven sprocket 2e is connected to the roller side sprocket 8b of the squeezing roller 8 (see Figure 3) via a chain 18, and transmits the power of the motor 4 to the squeezing roller 8 via the outer tube 2b of the rotating drum 2, the end disc 2f, the driven sprocket 2e, and the chain 18.

[0027] Although the first embodiment illustrates a coolant treatment device equipped with one rotating drum 2, the coolant treatment device of the present invention may also be equipped with multiple rotating drums. Also, the coolant treatment device may be a type in which the outer cylinder is fixed and the inner cylinder is rotated.

[0028] <Squeezing roller> A squeezing roller 8 is installed near the top of the rotating drum 2 to squeeze out liquid from the magnetic sludge that has been magnetically attached to the rotating drum 2. As shown in Fig. 3, the squeezing roller 8 includes a roller shaft 8a, a roller-side sprocket 8b fixed to the roller shaft 8a, and a roller main body 8c. One end of the roller shaft 8a extends to the outside of the main body 1, and a rotor 10b that constitutes a rotation detector 10 is fixed to the tip.

[0029] As described above, the roller-side sprocket 8b is connected via the chain 18 to the driven sprocket 2e fixed to the end disk 2f of the rotating drum 2. This causes the squeezing roller 8 to rotate in conjunction with the rotating drum 2.

[0030] The roller body 8c has an elastic body such as rubber disposed on the outer circumferential surface thereof, and is pressed against the outer circumferential surface of the outer cylinder 2b of the rotating drum 2 with a predetermined pressure. The elastic body disposed on the surface of the roller body 8c is mainly made of CR (chloroprene) rubber, NBR (nitrile) rubber, or the like, but it is also possible to use, for example, an uncrosslinked polyurethane material whose main component is polyester polyol.

[0031] <Scraper> A scraper 7 is installed near the top of the rotating drum 2 to scrape the magnetic sludge from which the liquid has been squeezed out by the squeezing roller 8 from the rotating drum 2 (see Figure 1). The scraper 7 is installed in an area where no magnetic force acts, and abuts against the outer surface of the outer cylinder 2b of the rotating drum 2.

[0032] Next, the operation of the rotating drum 2 will be described. Magnetic sludge adheres to the outer circumferential surface of the rotating drum 2, which is immersed in the coolant liquid, due to the action of magnetic force. When the outer cylinder 2b of the rotating drum 2 is rotated, the magnetic sludge becomes magnetically attached to the outer circumferential surface of the rotating drum 2 and moves in the direction of rotation of the outer cylinder 2b due to friction with the outer circumferential surface of the outer cylinder 2b. As the magnetically attached magnetic sludge passes between the outer circumferential surface of the rotating drum 2 and the squeezing roller 8, the liquid content of the magnetic sludge is squeezed out, allowing magnetic sludge with a low liquid content to be separated and recovered. The magnetic sludge from which the liquid content has been squeezed then moves to a position where it is not affected by magnetic force and is scraped off the outer circumferential surface of the rotating drum 2 by the scraper 7. The scraped magnetic sludge S is discharged from the magnetic material discharge section 6b.

[0033] <Rotation detector> The rotation detector 10 detects abnormal rotation of the rotating drum 2. Problems such as a missing sprocket can prevent the rotating drum 2 from properly transmitting the driving force generated by the motor 4, causing the outer cylinder 2b of the rotating drum 2 to stop rotating or to rotate improperly (abnormal rotation). If coolant is supplied to the coolant treatment device 100 while the rotating drum 2 is stopped, magnetic sludge accumulates between the rotating drum 2 and the bottom plate 1a, stopping the flow of coolant. If coolant continues to be supplied to the coolant treatment device 100, the coolant will not be discharged from the treatment liquid discharge section 6a of the coolant treatment device 100, causing problems such as overflow from the upper end of the main body 1 of the coolant treatment device 100. By providing the rotation detector 10, the coolant treatment device 100 of the present invention can immediately detect abnormal rotation of the rotating drum and address problems before they occur, such as coolant overflow.

[0034] As shown in Fig. 2, the rotation detector 10 is installed on the outside of the main body 1. Also, as shown in Fig. 3, the rotation detector 10 includes a rotor 10b fixed to the tip of the roller shaft 8a of the squeezing roller 8, and a proximity switch 10a installed near the rotor 10b.

[0035] The rotor 10b is a rectangular plate-like member that rotates with the roller shaft 8a. The proximity switch 10a detects the distance to the rotor 10b. When the rotor 10b rotates at a constant rotation speed, the distance between the proximity switch 10a and the rotor 10b fluctuates at a constant rhythm, allowing the stable rotation speed to be recognized. On the other hand, if an abnormality occurs in the rotation speed of the rotor 10b, the distance between the proximity switch 10a and the rotor 10b, which fluctuates at a constant rhythm, fluctuates irregularly. This irregular fluctuation can be used to detect abnormal rotation of the squeezing roller 8. Furthermore, since the squeezing roller 8 is linked to the rotation of the outer cylinder 2b of the rotating drum 2 via the roller-side sprocket 8b, detecting abnormal rotation of the squeezing roller 8 can determine that abnormal rotation of the rotating drum 2 has occurred. The data detected by the proximity switch 10a is sent to a control unit such as a computer.

[0036] The rotation detector 10 may be any device capable of detecting abnormal rotation of the rotating drum 2. In addition to devices that detect the distance from the rotor, such as the proximity switch of the first embodiment, other examples include means for attaching reflectors or magnets to the outer circumferential surface of the squeezing roller 8 or the rotating drum 2, or a sprocket, and detecting the reflectors or magnets with an optical detection sensor or a magnetic sensor, or means for controlling the rotation speed of the motor 4 with an inverter and detecting abnormal rotation based on fluctuations in the inverter current value. Even if the motor 4 is rotating normally, if the sprocket is missing or the like, the rotating drum 2 may not rotate normally, so it is preferable to detect abnormal rotation of the rotating drum 2 or a rotating body that rotates in synchronization with the rotation of the rotating drum 2.

[0037] Furthermore, the rotation detector 10 may be installed in any position. In the first embodiment, it is installed outside the main body 1, but the rotation detector 10 may also be installed inside the main body 1. By locating it outside the main body 1, contamination of the rotation detector 10 by the coolant liquid is prevented, and rotation abnormalities can be accurately detected.

[0038] When the rotation detector 10 is disposed outside the main body 1, it is preferable to extend only the rotation shaft in order to minimize the space required to install the rotation detector 10. In the coolant treatment device 100 of the first embodiment, the drum shaft 2c of the rotating drum 2 is a fixed shaft, so the roller shaft 8a of the squeezing roller 8 is extended and abnormal rotation of the squeezing roller 8 is detected, thereby indirectly detecting abnormal rotation of the rotating drum 2. Furthermore, because the squeezing roller 8 is disposed above the liquid surface of the coolant, contamination of the rotation detector 10 by the coolant is also suppressed. Incidentally, the detection of rotation abnormality of the rotating drum 2 may be performed indirectly, as in the first embodiment, or a rotation detector 10 may be provided on the rotating drum 2 to directly detect rotation abnormality of the rotating drum 2.

[0039] <Control unit> The coolant treatment device 100 of the present invention is preferably provided with a control unit that automatically controls the coolant to prevent problems such as overflow when the rotation detector 10 detects abnormal rotation of the rotating drum 2. The control means by the control unit is not particularly limited as long as it is a means for restricting the amount of coolant flowing into the main body 1. Examples include control means that reduces or stops the amount of coolant flowing into the main body 1 using inflow rate adjustment means that adjusts the amount of coolant flowing into the main body 1, and control means that branches the supply flow path for coolant to the main body 1, provides an avoidance flow path to avoid the supply of coolant to the main body 1, and switches the flow of coolant to the avoidance flow path by operating a switching valve. In addition, the coolant treatment device of the present invention is not limited to control by the control unit; when abnormal rotation is detected, an operator may adjust the flow rate of a pump or the like, or operate a switching valve to an avoidance flow path.

[0040] The inflow rate adjusting means controls the flow rate in response to the rotation abnormality detected by the rotation detector 10. For example, data from the rotation detector 10 is input to the control unit, and the control unit issues a command to adjust the flow rate in response to the data.

[0041] The control unit preferably classifies the data obtained from the rotation detector into two or more data categories and executes processing according to each data category. For example, the control unit classifies the data obtained from the rotation detector into data category (1) when a rotation abnormality occurs in which rotation stops, and data category (2) when a rotation abnormality occurs in which the rotation speed fluctuates, and executes processing according to each data category. Examples of processing according to data category (1) include stopping the inflow of coolant into the main body 1 using the inflow rate adjustment means, and switching the switching valve of the supply flow path to divert the coolant to an avoidance flow path. Examples of processing according to data category (2) include reducing the inflow rate of coolant into the main body 1 using the inflow rate adjustment means.

[0042] FIG. 4 is a flowchart illustrating an example of control by the control unit of the coolant processing device according to the first embodiment of the present invention. As shown in FIG. 4, the coolant processing device 100 is first started (Step 1). Next, the rotation of the squeezing roller 8 is detected by the rotation detector 10, thereby indirectly monitoring the rotation of the rotating drum 2 (Step 2). The control unit stores data for when the rotation of the rotating drum 2 stops as data category (1) and data for when an abnormal rotation occurs, causing the rotation speed of the rotating drum 2 to fluctuate as data category (2). The control unit determines whether the data from the rotation detector 10 corresponds to data category (1) (if 1). If it does, the pump installed in the supply flow path is stopped, thereby halting the supply of coolant to the main body 1 (Step 3). Next, an alarm is initiated (Step 4). The alarm is issued by sounding an alarm, displaying an alarm on the screen, or the like. On the other hand, if the data from the rotation detector 10 does not correspond to data category (1), the control unit determines whether it corresponds to data category (2) (if 2). If the data category (2) applies, the amount of coolant supplied to the main body by the pump installed in the supply flow path is reduced (Step 5), and then an alarm is initiated (Step 6). If the data category (2) does not apply, the system continues to monitor for rotation abnormalities. This control makes it possible to immediately detect abnormal rotation of the rotating drum 2 and prevent problems such as coolant overflow.

[0043] The warning and alarm screen display may be implemented in the coolant treatment device, or may be implemented in a control unit (room) installed away from the coolant treatment device. In the case of operator control, the operator constantly monitors the control unit, so it is preferable to display the alarm screen display on the control unit. Also, by displaying the alarm screen display on the control unit, the pump can be immediately operated from the control unit.

[0044] [Coolant treatment system] 5 shows the overall configuration of a coolant treatment system 200 equipped with the coolant treatment device 100 according to the first embodiment of the present invention, and a machine tool 300. The machine tool 300 is a metal cutting machine such as a grinding machine or cutting machine that uses coolant, and generates particles such as chips of various sizes.

[0045] The coolant treatment system 200 of the present invention includes a sludge conveyor 16 that settles and separates magnetic sludge from used coolant discharged from a machine tool 300, a coolant treatment device 100 that magnetically separates the magnetic sludge from the supernatant of the sludge conveyor 16, a dirty liquid tank 12 that stores the treatment liquid of the coolant treatment device 100, a filtration device 15 that filters the magnetic sludge from the treatment liquid stored in the dirty liquid tank 12 using a filter or the like, and a clean tank 11 that stores the filtrate filtered by the filtration device 15. The filtrate stored in the clean tank 11 is then reused as coolant for the machine tool 300.

[0046] The sludge conveyor 16 is a device that scrapes and removes sludge that has settled to the bottom of the storage tank. Used coolant discharged from the machine tool 300 is supplied to the sludge conveyor 16 via flow path L2, and the magnetic sludge that has settled is removed by sedimentation separation. The supernatant of the sludge conveyor 16 is supplied by pump P3 via supply flow path L3 to the main body 1 of the coolant treatment device 100 of the present invention. The magnetic separation process in the coolant treatment device 100 is as described above.

[0047] The treatment liquid treated in the coolant treatment device 100 is supplied to the dirty liquid tank 12 via flow path L4. The treatment liquid stored in the dirty liquid tank 12 is supplied to the filtration device 15 by the pump P2 via flow path L5, where magnetic sludge is removed. The filtrate filtered by the filtration device 15 is supplied to the clean liquid tank 11 via flow path L6.

[0048] The clean liquid tank 11 and the dirty liquid tank 12 are formed by providing a partition wall 13 in a single processing tank. Furthermore, an opening 14 is formed in the upper part of the partition wall 13, and the clean liquid tank 11 and the dirty liquid tank 12 are connected to each other in the upper space. The clean liquid tank 11 and the dirty liquid tank 12 may be formed as separate tanks, in which case the upper spaces of the clean liquid tank 11 and the dirty liquid tank 12 can be connected to each other by piping or the like. By connecting the upper spaces of the clean liquid tank 11 and the dirty liquid tank 12, the filtrate from the clean liquid tank 11 can overflow and flow into the dirty liquid tank 12, so the amount of coolant filtered by the filtration device 15 is set to be greater than the amount of coolant supplied to the machine tool 300. This prevents the liquid level in the clean liquid tank 11 from dropping, which could cause the supply of coolant to the machine tool 300 to stop.

[0049] The coolant treatment system 200 of the above embodiment is equipped with the sludge conveyor 16, the coolant treatment device 100 of the present invention, and the filtration device 15 as devices for removing sludge, but it is sufficient if it can remove magnetic sludge to the extent that it can be reused as coolant. In addition to these, for example, a cyclone separator that separates and removes sludge by centrifugal force may also be combined.

[0050] Next, we will explain a control method for preventing problems such as coolant overflow when the rotation detector 10 detects abnormal rotation of the rotating drum 2 in the coolant treatment device 100 of the present invention. In the coolant treatment system 200, the supply flow path L3 branches off via a switching valve V1 and is equipped with an avoidance flow path L7 for avoiding the supply of coolant to the main body 1. The avoidance flow path L7 is also connected to the dirty tank 12.

[0051] When the rotation detector 10 detects abnormal rotation of the rotating drum 2, the switching valve V1 operates, switching the flow of coolant from the supply flow path L3 to the bypass flow path L7. The coolant is then supplied to the dirty tank 12 and filtered by the filtration device 15. This stops the supply of coolant to the coolant treatment device 100, preventing problems such as overflow. While the supply of coolant to the coolant treatment device 100 is stopped, any abnormalities in the rotating drum 2 can be investigated and repaired. Note that while the bypass flow path L7 is in use, the load on the filtration device 15 temporarily increases, but this can be addressed by increasing the frequency of cleaning processes such as backwashing.

[0052] Second Embodiment 6 shows the internal structure of a coolant treatment device 101 according to a second embodiment of the present invention. The coolant treatment device 101 according to the second embodiment is equipped with a driven rotor 17 to indirectly detect abnormal rotation of the rotating drum 2.

[0053] As shown in Figure 7, the driven rotor 17 is journalled on a support 19 mounted on the top surface of the main body 1. The driven rotor 17 comprises a driven rotor shaft 17a and a driven rotor sprocket 17b fixed to the periphery of the driven rotor shaft 17a, with a rotor 10b fixed to the end of the driven rotor shaft 17a. The driven rotor sprocket 17b is connected to a driven sprocket of the rotating drum 2 via a chain 18, and the driven rotor 17 rotates in synchronism with the rotation of the rotating drum 2. By providing the driven rotor 17, even in a coolant processing device that does not have a squeeze roller or the like, the rotation detector 10 can be installed in a position where there is no risk of contamination by the coolant liquid. [Industrial Applicability]

[0054] The coolant treatment device of the present invention is used to recover magnetic materials from coolant in metal cutting machines that use magnetic metals as cutting materials, metal polishing machines that use magnetic metals as polishing materials, etc. The coolant can be either oil-based or water-soluble. [Explanation of symbols]

[0055] 100, 101...coolant treatment device, 1...main body, 1a...bottom plate, 1b...liquid reservoir, 1c...base, 1d...side wall, 2...rotating drum, 2a...inner cylinder, 2b...outer cylinder, 2c...drum shaft, 2d...bearing, 2e...driven sprocket, 2f...end disk, 3...magnet, 4...motor, 5...inlet portion, 6a...treated liquid discharge portion, 6b...magnetic material discharge portion, 7...scraper, 8...squeezing roller, 8a...roller shaft, 8b...roller side sprocket, 8c...roller body, 9...rectifying wall, 10...rotation detector , 10a... proximity switch, 10b... rotor, 11... clean liquid tank, 12... dirty liquid tank, 13... partition wall, 14... opening, 15... filtration device, 16... sludge conveyor, 17... driven rotor, 17a... driven rotor shaft, 17b... driven rotor side sprocket, 18... chain, 19... support, 200... coolant liquid treatment system, L1, L2, L4 to L6... flow path, L3... supply flow path, L7... avoidance flow path, P1 to P3... pump, V1... switching valve, S... magnetic sludge

Claims

1. A coolant treatment device that removes magnetic material from used coolant, The device comprises a rotating drum on which a plurality of magnets are arranged, and a rotation detector that detects abnormal rotation of the rotating drum, the rotation detector is comprised of a rotor and a means for detecting the number of rotations of the rotor, a reflector and a means for detecting the reflector, or a magnet and a means for detecting the magnet; A coolant treatment device characterized in that at least one of the rotor, reflector and magnet is provided on the rotating drum, and abnormal rotation of the rotating drum is directly detected by a corresponding detection means.

2. The coolant treatment device includes a main body that houses the rotating drum therein, The coolant processing device according to claim 1, wherein the rotation detector is installed on the outside of the main body.

3. 3. The coolant processing device according to claim 1, wherein the abnormal rotation of the rotating drum is an abnormal stop of the rotating drum.

4. A coolant treatment device according to any one of claims 1 to 3, characterized in that it is provided with a control unit that automatically controls the coolant so that it does not overflow from the upper end of the main body that houses the rotating drum when the rotation detector detects abnormal rotation of the rotating drum.

5. The coolant processing device according to claim 4, wherein the control unit classifies the data obtained from the rotation detector into two or more data categories and executes processing according to each data category.

6. The coolant processing device described in claim 5, characterized in that the control unit stores data in a data category (1) for when the rotation of the rotating drum stops, and data in a data category (2) for when a rotation abnormality occurs in which the rotation speed of the rotating drum fluctuates.

7. A control method for a coolant processing device that removes magnetic material from used coolant, The coolant processing device includes a rotating drum having a plurality of magnets arranged thereon and a rotation detector that detects abnormal rotation of the rotating drum, the rotation detector is comprised of a rotor and a means for detecting the number of rotations of the rotor, a reflector and a means for detecting the reflector, or a magnet and a means for detecting the magnet; At least one of the rotor, reflector, and magnet is provided on the rotating drum, and abnormal rotation of the rotating drum is directly detected by a corresponding detection means, A control method for a coolant processing device, characterized in that when the rotation detector detects abnormal rotation of the rotating drum, control is performed to prevent coolant liquid from overflowing from the upper end of the main body that houses the rotating drum inside.

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