Cleaning device

Abstract

To provide a cleaning device that does not permit upsizing of a power source and dispenses with an external power supply.SOLUTION: A pump sucks in liquid containing foreign matter and discharges it. The liquid discharged from the pump flows into a foreign matter remover. The foreign matter remover removes foreign matter from the inflow of liquid and discharges the liquid clear of the foreign matter. The foreign matter remover has a battery as a power source. The pump has a different power source from the power source of the foreign matter remover. A controller measures a physical amount relating to the foreign matter removal ability of the foreign matter remover and, if the measurement result falls out of an allowable range, stops the pump.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a cleaning device for removing foreign matter from a liquid containing foreign matter. [Background technology]

[0002] Coolant containing magnetic sludge is discharged from the grinding machine. A solid-liquid separation device called a magnetic separator is used to remove the magnetic sludge from the coolant. The coolant from which the magnetic sludge has been removed is stored in a coolant tank within the factory. The coolant in the coolant tank is sent to the grinding machine and reused.

[0003] Sludge that could not be separated by the solid-liquid separator flows into the coolant tank and settles there. A portable coolant cleaning device that sucks up the sludge that has settled in the coolant tank and cleans the tank is disclosed in the following Patent Document 1. This portable coolant cleaning device includes a coolant suction pump, a magnetic separator (solid-liquid separator), and a small generator that are mounted on a transport cart.

[0004] During cleaning, the coolant in the coolant tank is sucked together with the sludge through the coolant suction pipe connected to the coolant suction pump, and after the sludge is collected by the ceramic separator, the coolant is returned to the coolant tank. The coolant suction pump and ceramic separator are driven by electricity generated by a small generator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3065384 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional portable coolant cleaning devices require a small generator to be operated during cleaning, which causes exhaust gas to be discharged into the factory. Patent Document 1 describes that if power can be supplied from an external power source, the small generator can be removed. If the small generator is removed, it is sufficient to have an external power source near the operating location, but if there is no external power source nearby, the portable coolant cleaning device must be connected to a distant external power source using a cord reel or the like.

[0007] If a battery is installed as the power source instead of a small generator, a cord reel etc. is not required, but the battery becomes large in size in order to supply power to the coolant suction pump and the magnetic separator. An object of the present invention is to provide a cleaning device that suppresses the increase in size of the power source and does not require an external power source. [Means for solving the problem]

[0008] According to one aspect of the present invention, A pump that sucks and discharges liquid containing foreign matter; a foreign matter removal device which receives the liquid discharged from the pump, removes foreign matter from the flowing liquid, and discharges the liquid from which the foreign matter has been removed; a battery as a power source for the foreign object removal device; Equipped with The power source of the pump is different from the power source of the foreign object removal device, Furthermore, Measure the battery output voltage and a control device that stops the pump when the measurement result falls outside an acceptable range; A cleaning device comprising: Effect of the Invention

[0009] Since the power source of the pump is different from the power source of the foreign object removal device, it is possible to prevent the battery from becoming large. Measure the battery output voltage and Stops the pump if the measurement result is outside the acceptable range ByThis suppresses the occurrence of a situation in which liquid flows from the pump into the foreign matter removal device in excess of the foreign matter removal capacity when the foreign matter removal capacity of the foreign matter removal device is reduced. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram of a cleaning device, a grinding machine, and the like according to this embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of a magnetic foreign matter remover mounted on the cleaning device according to this embodiment. [Diagram 3] FIG. 3 is a block diagram of the cleaning device according to the present embodiment. [Figure 4] FIG. 4 is a flow chart showing the procedure performed by the control device of the cleaning device according to this embodiment. [Diagram 5] FIG. 5 is a block diagram of a cleaning device according to a modified example of the embodiment. [Figure 6] FIG. 6 is a flow chart showing a procedure performed by the control device of the cleaning device according to the modified example shown in FIG. [Figure 7] FIG. 7 is a block diagram of a cleaning device according to another modified example of the embodiment. [Figure 8] FIG. 8 is a flow chart showing a procedure performed by the control device of the cleaning device according to the modified example shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A cleaning device according to one embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic diagram of a cleaning device 10, a grinding machine 70, and the like according to this embodiment. Coolant containing magnetic sludge discharged from the grinding machine 70 flows into a magnetic foreign matter removal device 71. The magnetic foreign matter removal device 71 separates the magnetic sludge contained in the coolant from the coolant. The coolant 61 after the magnetic sludge is separated is accumulated in a tank 60. The coolant 61 in the tank 60 is sucked up by a pump 72 and sent to the grinding machine 70 for reuse. When the coolant 61 is repeatedly reused, the magnetic sludge 62 that was not removed by the magnetic foreign matter removal device 71 settles to the bottom of the tank 60.

[0012] The cleaning device 10 includes a magnetic foreign matter removal device 20, a pump 40, a control device 41, a battery 42, and an inflow box 43, which are mounted on a cart consisting of a frame 11, casters 12, and a handle 13. The suction port of the pump 40 is connected to a suction side joint 44. A suction hose 51 is connected to the suction side joint 44. The discharge port of the pump 40 is connected to the inflow port 21 of the magnetic foreign matter removal device 20 via the inflow box 43. The discharge port 22 of the magnetic foreign matter removal device 20 is connected to a discharge side joint 45. A discharge hose 52 is connected to the discharge side joint 45.

[0013] As the pump 40, for example, an air-driven diaphragm pump is used. The pump 40 is driven by air (compressed air) supplied from an air pipe in the factory. The magnetic foreign matter removal device 20 is driven by an electric motor, and the driving power of the electric motor is supplied from a battery 42. In other words, the battery 42 is a power source that drives the electric motor. A control device 41 controls the operation of the pump 40 and the magnetic foreign matter removal device 20.

[0014] During cleaning, the tip of the suction hose 51 connected to the suction side joint 44 is placed near the magnetic sludge 62 that has settled at the bottom of the tank 60, and the magnetic sludge 62 is sucked in together with the coolant 61. The sucked in coolant flows into the magnetic foreign matter removal device 20 via the inflow box 43. The inflow box 43 has the function of reducing the pulsation of the coolant discharged from the pump 40.

[0015] The magnetic foreign matter removal device 20 removes magnetic sludge contained in the coolant. The magnetic sludge is discharged from the foreign matter discharge port 23. The coolant from which the magnetic sludge has been removed flows out from the outlet 22 and is returned to the tank 60 through the discharge hose 52 connected to the discharge side joint 45.

[0016] Next, the structure and operation of the magnetic foreign matter remover 20 will be described with reference to Fig. 2. Fig. 2 is a cross-sectional view of the magnetic foreign matter remover 20.

[0017] A flow path 24 through which a coolant 61 flows is defined within the housing 29. In Fig. 2, the flow direction of the coolant 61 within the flow path 24 is indicated by an arrow. The coolant 61 flows into the flow path 24 from an inlet 21 of the housing 29. The coolant 61 flows within the flow path 24 and flows out from an outlet 22 provided in the vicinity of the downstream end of the flow path 24.

[0018] The rotary magnetic drum 25 is disposed in the housing 29. The rotary magnetic drum 25 includes an outer cylinder 25A and an inner cylinder 25B that are disposed coaxially. The rotary magnetic drum 25 is supported in the housing 29 in a position in which its central axis is parallel to the liquid surface of the coolant 61 and perpendicular to the flow direction of the coolant 61. A part of the outer peripheral surface of the outer cylinder 25A is immersed in the coolant 61 flowing through the flow path 24. The outer cylinder 25A is rotated around the rotation center 25R by the motor 26. The driving force is transmitted from the motor 26 to the outer cylinder 25A by, for example, a sprocket and a chain. The movement direction (circumferential speed direction) of the outer peripheral surface of the outer cylinder 25A is opposite to the flow direction of the coolant 61.

[0019] In the internal space of the outer cylinder 25A, the inner cylinder 25B is disposed with a small gap from the inner peripheral surface of the outer cylinder 25A. The inner cylinder 25B is fixed to the housing 29 and does not rotate, and a plurality of magnets 25C are disposed in a line in the circumferential direction on the outer peripheral surface of the inner cylinder 25B. Each of the magnets 25C is disposed so that magnetic poles of different polarities appear on the inner peripheral surface and the outer peripheral surface, and S poles and N poles appear alternately in the circumferential direction. In addition, the magnets 25C are disposed in the region immersed in the coolant 61 and in the region extending from the immersed region to the top of the inner cylinder 25B in the circumferential direction of the outer peripheral surface of the outer cylinder 25A. The plurality of magnets 25C generate a magnetic flux on the outer peripheral surface of the outer cylinder 25A. This magnetic flux attracts the magnetic sludge 62 to the outer peripheral surface of the outer cylinder 25A.

[0020] A part of the bottom surface of the flow passage 24 is shaped to reflect the shape of the outer peripheral surface of the outer cylinder 25A so that the radial dimension from the outer peripheral surface of the outer cylinder 25A to the bottom surface of the flow passage 24 falls within a predetermined range. When the coolant 61 flows near the outer peripheral surface of the outer cylinder 25A, the magnetic force of the magnet 25C attracts the magnetic sludge 62 to the outer peripheral surface of the outer cylinder 25A. The attracted magnetic sludge 62 moves with the rotation of the outer cylinder 25A and is separated from the coolant 61.

[0021] The scraper 28 contacts the outer peripheral surface of the outer cylinder 25A at a position about 1 / 8 revolution from the top of the outer cylinder 25A in the circumferential direction. No magnet 25C is disposed at the portion of the outer peripheral surface of the outer cylinder 25A with which the scraper 28 is in contact. The scraper 28 scrapes off the magnetic sludge 62 on the outer peripheral surface of the outer cylinder 25A. The magnetic sludge 62 scraped off by the scraper 28 is collected in the collection container 65 through the foreign matter discharge port 23.

[0022] The roller 27 is pressed against the outer peripheral surface of the outer cylinder 25A at a position from the contact point between the outer peripheral surface of the outer cylinder 25A and the liquid surface of the coolant 61 to the top of the outer cylinder 25A in the circumferential direction. The roller 27 rotates in the opposite direction to the rotation direction of the outer cylinder 25A by transmitting power from the rotating shaft of the outer cylinder 25A via a sprocket and a chain. An elastic body is arranged on the outer peripheral surface of the roller 27. When the magnetic sludge 62 adsorbed on the outer peripheral surface of the outer cylinder 25A passes between the outer cylinder 25A and the roller 27, the liquid adhering to the outer peripheral surface of the outer cylinder 25A is removed. This makes it possible to separate and recover the magnetic sludge 62 with a small liquid content. In this way, the magnetic foreign matter removal device 20 separates the magnetic sludge 62 contained in the coolant 61 flowing through the flow path 24 from the coolant 61 by using a magnetic force.

[0023] The output voltage of the battery 42, which serves as the power source for the motor 26, is measured by a voltage sensor 35. The rotation speed of the motor 26 is measured by a rotation speed sensor 36. The liquid level of the coolant 61 in the flow path 24 is measured by a liquid level sensor 37. These measurement results are input to the control device 41 (FIG. 1).

[0024] Next, the control of the operation of the motor 26 and the pump 40 by the control device 41 will be described with reference to Fig. 3. Fig. 3 is a block diagram of the cleaning device 10 according to this embodiment.

[0025] The battery 42 can be charged by connecting the charging device 46 to an external power source. The charging device 46 may be mounted on the frame 11 together with the battery 42, or may be located in a factory. DC power output from the battery 42 is converted to AC power by an inverter 47. The AC power is supplied to the motor 26 via the control device 41.

[0026] The in-factory air piping 75 is connected to the solenoid valve 48 mounted on the frame 11. Air (compressed air) is supplied from the in-factory air piping 75 to the pump 40 via the solenoid valve 48. This compressed air becomes the power source of the pump 40.

[0027] A voltage sensor 35 measures the output power of the battery 42. The measurement result of the voltage sensor 35 is input to the control device 41. The control device 41 controls the on / off of the solenoid valve 48 and the on / off of the motor 26 based on the measurement result of the voltage sensor 35. Furthermore, the control device 41 controls an alarm issuing device 49 to issue an alarm. As the alarm issuing device 49, a warning light, an alarm sound generator, etc. are used.

[0028] Next, the control procedure performed by the control device 41 will be described with reference to FIG. 4. FIG. 4 is a flow chart showing the procedure performed by the control device 41. When an operation to start the operation of the cleaning device 10 is performed, the control device 41 starts the operation of the pump 40 and the magnetic foreign matter removal device 20 (step S1). Specifically, the control device 41 opens the solenoid valve 48 and supplies power to the motor 26. The control device 41 judges at regular intervals whether the output voltage of the battery 42 measured by the voltage sensor 35 is within the allowable range (step S2). For example, an allowable lower limit value is specified as the allowable range of the output voltage of the battery 42, and when the output voltage falls below the allowable lower limit value, the control device 41 judges that the output voltage is outside the allowable range.

[0029] If the output voltage is within the allowable range, the pump 40 and the magnetic foreign matter removal device 20 continue to operate. If the output voltage of the battery 42 is outside the allowable range, the operation of the pump 40 and the magnetic foreign matter removal device 20 is stopped (step S3). Specifically, the control device 41 closes the solenoid valve 48 and stops the supply of power to the motor 26. Thereafter, an alarm is issued from the alarm issuing device 49 (step S4).

[0030] Next, the excellent effects of this embodiment will be described. In the cleaning device according to this embodiment, casters 12 are attached to the frame 11, so that an operator can easily move the cleaning device 10 within the factory. For example, it is possible to move the cleaning device 10 to a location in the tank 60 where a large amount of magnetic sludge 62 has accumulated, and pinpoint the magnetic sludge 62 in the tank 60 and remove it.

[0031] In this embodiment, the power source of the pump 40 is compressed air from the air piping in the factory, and the power source of the motor 26 of the magnetic foreign matter removal device 20 is electricity from a battery 42 mounted on the frame 11. Therefore, it is possible for the device to operate without receiving an external power supply.

[0032] When the output voltage of the battery 42 decreases, the magnetic sludge removal capability of the magnetic foreign matter removal device 20 decreases. When the magnetic sludge removal capability decreases, unremoved magnetic sludge 62 accumulates at the bottom of the flow path 24 (FIG. 2) of the magnetic foreign matter removal device 20. When the space between the rotating magnetic drum 25 and the bottom of the flow path 24 is blocked by the magnetic sludge 62, the coolant 61 is blocked and the liquid level of the coolant 61 in the flow path 24 rises. When the liquid level continues to rise, the coolant 61 overflows from the gap at the top of the housing 29.

[0033] In this embodiment, when the output voltage of the battery 42 falls below the allowable lower limit, the control device 41 stops the pump 40. This stops the inflow of the coolant 61 into the magnetic foreign matter removal device 20, preventing the coolant 61 from overflowing. Furthermore, because the control device 41 stops the magnetic foreign matter removal device 20, unnecessary power consumption can be reduced. Furthermore, because the control device 41 issues an alarm from the alarm issuing device 49 (FIG. 3), the operator can immediately know that the reason for the stop of suction is a drop in the voltage of the battery 42.

[0034] If the power source of the pump 40 is the battery 42 that is also the power source of the magnetic foreign matter removal device 20, the capacity of the battery 42 must be large to ensure sufficient suction power and sufficient continuous operation time of the pump 40. In this embodiment, the battery 42 is not used as the power source of the pump 40, so that the battery 42 can be prevented from becoming large in capacity and size.

[0035] Next, a modification of this embodiment will be described. In this embodiment, the object to be cleaned is coolant containing magnetic sludge, but it is also possible to clean a tank that stores a liquid containing magnetic foreign matter.

[0036] Furthermore, in this embodiment, the power source of the pump 40 is compressed air from the factory, and the power source of the magnetic foreign matter removal device 20 is electricity from the battery 42. In this way, when the power source of the pump is different from the power source of the magnetic foreign matter removal device 20, a situation may arise in which the magnetic foreign matter removal device 20 almost stops and only the pump 40 continues to operate. When such a situation may occur, it is advisable to detect a decrease in the foreign matter removal ability of the magnetic foreign matter removal device 20 and stop the pump 40. For example, it is advisable to measure a physical quantity related to the foreign matter removal ability of the magnetic foreign matter removal device 20, and perform control to stop the pump 40 when the measurement result of this physical quantity falls outside an allowable range.

[0037] In this embodiment, whether or not to stop the operation of the pump 40 and the magnetic foreign matter removal device 20 is determined based on the measurement result of the output voltage of the battery 42. Alternatively, whether or not to stop the operation of the pump 40 and the magnetic foreign matter removal device 20 may be determined based on the state of charge (SOC) of the battery 42, etc.

[0038] In this embodiment, both the pump 40 and the magnetic foreign matter removal device 20 are stopped in step S3 (FIG. 4), but it is not necessary to stop the magnetic foreign matter removal device 20. Even in this case, overflow of the coolant can be avoided.

[0039] Next, a further modified example of the above embodiment will be described with reference to Figures 5 and 6. Description of the configuration common to the cleaning device according to the embodiment shown in Figures 3 and 4 will be omitted.

[0040] Fig. 5 is a block diagram of the cleaning device 10 according to this modification. In the embodiment shown in Fig. 3, the output voltage of the battery 42 is used as the physical quantity related to the foreign matter removal ability of the magnetic foreign matter removal device 20. In contrast, in the modification shown in Fig. 5, the rotation speed of the motor 26 is used as the physical quantity related to the foreign matter removal ability of the magnetic foreign matter removal device 20. A rotation speed sensor 36 measures the rotation speed of the motor 26, and the measurement result is input to the control device 41.

[0041] FIG. 6 is a flow chart showing the procedure performed by the control device 41 of the cleaning device 10 according to this modification. Steps S1, S3, and S4 are the same as those steps shown in FIG. 4. In the modification shown in FIG. 6, instead of step S2 in FIG. 4, the control device 41 judges whether the rotation speed of the motor 26 is within an allowable range (step S2a). For example, a lower limit value of the rotation speed of the motor 26 is specified as the allowable range. If the rotation speed of the motor 26 is within the allowable range, the operation of the pump 40 and the magnetic foreign matter removal device 20 is continued, and if it is outside the allowable range, the operation of the pump 40 and the magnetic foreign matter removal device 20 is stopped (step S3).

[0042] Next, a further modified example of the above embodiment will be described with reference to Figures 7 and 8. Description of the configuration common to the cleaning device according to the embodiment shown in Figures 3 and 4 will be omitted.

[0043] 7 is a block diagram of the cleaning device 10 according to this modification. In this modification, the liquid level of the coolant 61 in the flow path 24 (FIG. 2) is used as a physical quantity related to the foreign matter removal ability of the magnetic foreign matter removal device 20. A liquid level sensor 37 measures the liquid level of the coolant 61, and the measurement result is input to the control device 41.

[0044] FIG. 8 is a flow chart showing the procedure performed by the control device 41 of the cleaning device 10 according to this modification. Steps S1, S3, and S4 are the same as those steps shown in FIG. 4. In the modification shown in FIG. 8, instead of step S2 in FIG. 4, the control device 41 judges whether the height of the liquid level is within the allowable range (step S2b). For example, an upper limit value of the height of the liquid level is specified as the allowable range. If the height of the liquid level is within the allowable range, the operation of the pump 40 and the magnetic foreign matter removal device 20 is continued, and if the height of the liquid level is outside the allowable range, i.e., if the height of the liquid level exceeds the allowable upper limit value, the operation of the pump 40 and the magnetic foreign matter removal device 20 is stopped (step S3).

[0045] As physical quantities related to the foreign matter removal capability of the magnetic foreign matter removal device 20, the output voltage of the battery 42 employed in the embodiment shown in Figures 3 and 4 and the rotation speed of the motor 26 employed in the modified example shown in Figures 5 and 6 affect the foreign matter removal capability. In contrast to this, the height of the liquid surface employed in the modified example shown in Figures 7 and 8 as a physical quantity related to the foreign matter removal capability of the magnetic foreign matter removal device 20 varies in accordance with changes in the foreign matter removal capability of the magnetic foreign matter removal device 20. In this way, as the physical quantity related to the foreign matter removal capability of the magnetic foreign matter removal device 20, a physical quantity that affects the foreign matter removal capability may be employed, or a physical quantity that varies in accordance with changes in the foreign matter removal capability may be employed.

[0046] The modified example of the embodiment described with reference to Figures 5 to 8 can also provide the same effects as the embodiment described with reference to Figures 1 to 4. Furthermore, the measurement results of the output voltage of the battery 42, the rotation speed of the motor 26, and the height of the liquid level may be combined to determine whether or not to stop the pump 40 and the magnetic foreign matter removal device 20.

[0047] The above-mentioned embodiments and modifications are merely examples, and it goes without saying that partial replacement or combination of the configurations shown in different embodiments and modifications is possible. Similar effects due to similar configurations of multiple embodiments and modifications are not mentioned for each embodiment and modification. Furthermore, the present invention is not limited to the above-mentioned embodiments and modifications. For example, it will be obvious to those skilled in the art that various changes, improvements, combinations, etc. are possible. [Explanation of symbols]

[0048] 10 Cleaning equipment 11 Frame 12 Caster 13 Handle 20 Magnetic foreign matter removal device 21 Inlet 22 Outlet 23 Foreign matter outlet 24 Flow Path 25 Rotating Magnetic Drum 25A Outer tube 25B Inner cylinder 25C Magnet 25R Center of rotation 26 Motor 27 Lola 28 Scraper 29 Case 35 Voltage Sensor 36 Rotational Speed ​​Sensor 37 Liquid level sensor 40 Pump 41 Control device 42 Battery 43 Inflow box 44 Suction side joint 45 Discharge side joint 46 Charging device 47 Inverter 48 Solenoid valve 49 Alarm issuing device 51 Suction hose 52 Discharge hose 60 Coolant tank 61 Coolant 62 Magnetic Sludge 65 Collection Container 70 Grinding Machine 71 Foreign matter removal device 72 Pump 75 Factory air piping

Claims

1. A pump that sucks and discharges liquid containing foreign matter; a foreign matter removal device which receives the liquid discharged from the pump, removes foreign matter from the flowing liquid, and discharges the liquid from which the foreign matter has been removed; a battery as a power source for the foreign object removal device; Equipped with The power source of the pump is different from the power source of the foreign object removal device, a control device that measures an output voltage of the battery and stops the pump when the measured output voltage is outside a tolerance range; A cleaning device comprising:

2. The foreign matter removal device includes: a flow path through which the liquid flowing in from the pump flows; a rotating magnetic drum that is partially immersed in the liquid flowing through the flow path and rotates to remove magnetic foreign matter from the fluid; a motor that receives power from the battery and rotates the rotary magnetic drum; An outlet through which the fluid from which the magnetic foreign matter has been removed flows out; 2. The cleaning device of claim 1 including:

3. The cleaning device as described in Claim 2, wherein the control device further measures the rotational speed of the rotating magnetic drum and stops the pump when the measured rotational speed falls outside an acceptable range.

4. The cleaning device described in claim 2 or 3, wherein the control device further measures the liquid level of the liquid flowing through the flow path, and stops the pump when the measurement result of the liquid level height falls outside an acceptable range.

5. 5. The cleaning device of claim 1, wherein the pump is air driven.

6. In addition, it is equipped with an alarm issuing device, 6. The cleaning device according to claim 1, wherein the control device issues a warning from the warning device when a measurement result of the output voltage of the battery falls outside a tolerance range.

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