CN112007416A

CN112007416A - Portable circulating filter device

Info

Publication number: CN112007416A
Application number: CN202010032641.0A
Authority: CN
Inventors: 木本裕司
Original assignee: Goei Co Ltd
Current assignee: Goei Co Ltd; Goei Seisakusyo Co Ltd
Priority date: 2019-05-31
Filing date: 2020-01-13
Publication date: 2020-12-01
Also published as: JP2020196151A; JP7276832B2

Abstract

The invention provides a portable circulation filter device which can grind, cut or perforate in a short time and has high work efficiency even when an alternating current power supply is used as a power supply of a rotary tool. The portable circulation filter device 50 includes, inside the housing 51: a water tank 52, a storage filter unit 54, a partition plate 57, a suction pump 53, a supply pipe 56, a supply pump 55 for supplying lubricating water LW, a switching power supply 61 for converting electric power supplied to the supply pump 55 or both the suction pump 53 and the supply pump 55 from ac to dc, and a control board 60; the first space housing part 51A includes a suction pump 53, a supply pipe 56, a supply pump 55, and a control board 60, and the second space housing part 51B includes a water tank 52, a supply pipe 56, and a storage filter 54, and the first space housing part 51A and the second space housing part 51B are detachably provided.

Description

Portable circulating filter device

Technical Field

The present invention relates to a portable circulation filter device used when grinding, cutting, or piercing a workpiece with a rotary tool while circulating lubricating water to the workpiece.

Background

Conventionally, in a portable circulation filter device, a rotary tool is fixed to a working position, lubricating water is supplied from a supply hose to a water receiving guide tube to which a dust collection hose and a supply hose are attached, sludge in which lubricating water and dust are mixed is collected and filtered by the dust collection hose, and a hole is punched while the lubricating water is circulated again (see patent document 1).

On the other hand, in grinding work or cutting work, a rotary tool having a rotating wheel provided with a whetstone on a work surface is used. In the rotary tool, in order to prevent dust from scattering around, grinding work or cutting work is performed while a dust collector is connected to a cover of the rotary tool to collect dust (see patent document 2).

Documents of the prior art

Patent document

Japanese patent application laid-open No. 2013-67023 of patent document 1

Patent document 2 japanese patent application laid-open No. 2013-63495

Disclosure of Invention

Problems to be solved by the invention

In a portable circulation filter device, an AC power supply is used as a power supply for a rotary tool, and AC power flowing through the rotary tool is detected by a control board to drive a supply pump for supplying lubricating water and a suction pump for sucking sludge. Therefore, the alternating current flows through the control board, and the control board is easily burned due to the voltage variation.

To solve such problems, electrical components such as a transformer and a bridge diode are used to convert ac to dc. However, when a generator is used as an ac power supply, it is necessary to mount large electrical components on a control board in order to obtain a stable dc voltage, and the size of the control board is increased, which makes the device easily large. As a result, it is difficult to perform a work such as piercing in a narrow place. Further, since the control board is disposed below the storage tank of the lubricating water, the control board is likely to be short-circuited by adhesion of the lubricating water. As a result, the rotary tool is stopped for piercing and the like, and the work time is likely to be prolonged.

Accordingly, an object of the present invention is to provide a portable circulation filter device that can grind, cut, or perforate in a short time and has good work efficiency even when an ac power supply is used as a power supply for a rotary tool.

Means for solving the problems

In order to solve the above-described problems, a portable circulation filter device according to the present invention is a portable circulation filter device for supplying lubricating water to a cutting edge of a rotary tool and recovering and filtering sludge, which is a mixture of the lubricating water and powder generated by processing a workpiece by the rotary tool, and using the sludge as the lubricating water, the portable circulation filter device including, in a housing: a water storage tank for storing the lubricating water; a storage filter unit disposed at an upper portion of the water tank, and configured to store and filter the sludge; a partition plate disposed above the storage filter unit; a suction pump provided through the partition plate; a supply pipe for supplying the lubricating water; a supply pump that supplies the lubricating water through the supply pipe; a switching power supply that converts the electric power supplied to the supply pump or both the suction pump and the supply pump from an alternating current to a direct current; a control substrate that controls the suction pump and the supply pump; comprising: a first space housing section formed by partitioning a space including the suction pump, the supply pipe, the supply pump, and the control board by the partition plate; a second space housing part formed by partitioning a space having the water tank, the supply pipe, and the storage filter part by the partition plate; the first space case portion and the second space case portion are detachably provided.

According to the portable circulation filter device of the present invention, since the switching power supply for converting the electric power supplied to the supply pump or both the suction pump and the supply pump from ac to dc is provided, even when the ac power supply having a large voltage variation is used, a stable dc current having a small voltage variation can be caused to flow through the control board, and thus the control board can be prevented from being burned. In addition, by providing the switching power supply, the size of the control substrate can be reduced, the device can be miniaturized, and work such as machining can be performed in a narrow place.

Further, according to the portable circulation filter device of the present invention, the first space housing portion having the control board and the second space housing portion having the water storage tank are detachably provided while being separated by the partition plate, so that the lubricating water can be prevented from scattering toward the control board when the lubricating water stored in the water storage tank is exchanged, and therefore, the short circuit of the control board can be prevented.

Effects of the invention

The portable circulation filter device according to the present invention can prevent the control board from being burned and short-circuited even when an ac power supply is used as a power supply for a rotary tool, and thus can perform grinding, cutting, or punching in a short time. In addition, the portable circulation filter device according to the present invention can be downsized by reducing the size of the control substrate. In addition, the portable circulation filter device according to the present invention can perform continuous operation and has good operation efficiency because the lubricant water is not scattered on the control board.

Drawings

Fig. 1 is a schematic view, partially in section, schematically showing the structure of a portable circulation filtration device according to the present invention and the structure of a rotary tool used in the portable circulation filtration device.

Fig. 2 is a perspective view schematically showing a state in which a first space casing portion and a second space casing portion of a portable circulation filter device according to the present invention are separated from each other.

Fig. 3 is a schematic diagram schematically showing a cross section of the structure of the tool body in the rotary tool of fig. 1.

Fig. 4 is a wiring diagram showing the wiring of the portable circulation filter device according to the present invention.

Fig. 5 is a circuit diagram showing an example of a circuit of the switching power supply in the control board of fig. 3.

Fig. 6 is a schematic diagram schematically showing another configuration of a rotary tool used in the portable circulation filter device according to the present invention in cross section.

Detailed Description

An embodiment as an example of a portable circulation filter device according to the present invention will be described with reference to the accompanying drawings. In the drawings, the size intervals of the respective members may be exaggerated as appropriate for easy understanding. For ease of understanding of the description, the positions of the respective members are relative to each other and do not indicate specific positions.

As shown in fig. 1, the portable circulation filter device 50 is a device for supplying lubricating water LW to the cutting edge of the rotary tool 1, and recovering and filtering sludge G in which the lubricating water LW and the powder are mixed, and using the sludge G as the lubricating water LW. The workpiece WK is a hard structure such as concrete, stone, or a product related to the kiln industry. In addition, machining refers to grinding, cutting, or perforating.

First, a rotary tool using a portable circulation filter device will be described by taking a drill used for a drilling operation as an example. As shown in fig. 1 and 3, the rotary tool 1 (drill) is a water circulation type rotary tool that performs drilling by circulating lubricating water, and includes: a tool body 10, a water-receiving guide cylinder 3, and a movement guide lever 6.

The tool body 10 is a drill body configured to be attachable and detachable to and from a drill 2 (cutting edge) for piercing a workpiece WK. In addition, details of the tool body 10 will be described below.

The water receiving guide tube 3 is provided on the distal end side of the rotary shaft 11 of the tool body 10, and receives lubricating water LW used in the punching operation and sludge G discharged in the punching operation. The water-receiving guide tube 3 has a tube main body 3a, a third connection portion 3b, and a fourth connection portion 3c, the tube main body 3a covering the drill bit 2, the third connection portion 3b being connected to a distal end of a supply hose 41 for supplying lubricating water LW, and the fourth connection portion 3c being connected to a distal end of a suction hose 42 for sucking sludge G. The third connecting portion 3b is provided on the base end side of the cylinder main body 3a, and the fourth connecting portion 3c is provided on the tip end side of the cylinder main body 3 a. Further, the water receiving guide tube 3 is provided with a rubber ring at the tube tip, so that the lubricating water LW can be prevented from leaking even when there are irregularities on the wall surface of the workpiece WK.

The movement guide rod 6 is arranged in parallel along the water receiving guide cylinder 3, and guides the rotation shaft 11 of the tool body 10 to move forward and backward. The proximal end side of the movement guide rod 6 is fixed to the mounting portion 16 of the tool body 10 by a bolt or the like, and the distal end side thereof is inserted into and engaged with the engagement portion 4 of the water guide receiving tube 3. Therefore, the tip of the movement guide rod 6 protrudes from the engagement portion 4, and the movement guide rod 6 can guide the tool main 10 to move forward and backward while engaging with the engagement portion 4.

The drill 2 is a boring tool detachably provided at the distal end of a connection shaft 12, and the connection shaft 12 is provided at the distal end of a rotary shaft 11 of a tool body 10 via a water receiving supply portion 5. The drill 2 is obtained by sintering a raw material in which diamond grains are embedded in a sintered metal called a metal bond, for example. The material of the drill 2 is not particularly limited as long as it is used for the drilling operation.

The rotation shaft 11 of the water receiving supply unit 5 is provided at the distal end side of the rotation shaft 11 in a rotatable manner in a size that can be inserted from the proximal end side of the water receiving guide tube 3. A water receiving hole (not shown) for receiving the lubricating water LW supplied from the supply hose 41 is formed in a portion of the rotary shaft 11 located in the water receiving supply portion 5. The water supplied to the water receiving supply portion 5 is sent from the inside of the cylinder of the drill 2 to the tip of the drill 2 through the inside of the cylinder of the cylindrical connecting shaft 12.

As shown in fig. 3, the tool body 10 includes, inside a housing of the tool body 10 indicated by a broken line: a power transmission mechanism 14, a drive motor 13, a sensor (measuring means) 15, a switch (rotational speed selecting means) 17, a feedback control means 19, and a control board 20.

The power transmission mechanism 14 is a mechanism that transmits the rotation of the drive motor 13 to the rotary shaft 11, and includes, for example,

gears

14a and 14b disposed in meshing engagement. The gear 14a is attached to the tip of the output shaft 13a of the drive motor 13. The gear 14b is attached to the other end (the opposite side to the water receiving supply portion 5 in fig. 1) of the rotary shaft 11 parallel to the output shaft 13 a.

The power transmission mechanism 14 is not particularly limited as long as it can transmit the rotation of the drive motor 13 to the rotary shaft 11, and may be, for example, a belt drive.

The drive motor 13 rotates an output shaft 13a in accordance with a command from a feedback control unit 19 described later, and is, for example, a series commutator motor. The drive motor 13 rotates the drill 2 via the power transmission mechanism 14. In the present embodiment, the drive motor 13 includes an output shaft 13a, a bearing 13b, a rotor 13c, and a commutator 13 d. The output shaft 13a is a shaft that outputs the rotation of the drive motor 13. The bearing 13b is a bearing that supports the output shaft 13 a. The rotor 13c is a rotor for driving the motor 13, and has a number of turns capable of maintaining a target rotation speed described later. Further, the rotor 13c has an output shaft 13a fixed to its central axis. The commutator 13d reverses the direction of the current of the rotor 13c and is connected to the rotor 13 c.

The drive motor 13 is not limited to the series commutator motor, and may be a general motor. In addition, components such as a stator of the drive motor 13 are omitted. Further, the drive motor 13 may be a servomotor in which a motor and the sensor 15 are integrated.

The rotation speed of the motor 13 is controlled by the alternating current supplied through the control board 60 (switching power source 61) using the feedback control mechanism 19 provided in the control board 20, and the rotation speed of the drill 2 of the rotary tool 1 is controlled.

The sensor 15 measures the rotational speed of the drive motor 13, and outputs a feedback signal indicating the measured rotational speed to the feedback control unit 19. In the present embodiment, the sensor 15 is provided near the outer periphery of the gear 14a, and measures the rotation speed of the gear 14a as the rotation speed of the drive motor 13. For example, the sensor 15 may be a general rotation speed measuring sensor such as an optical sensor, a laser sensor, or a magnetic sensor.

The switch 17 allows the operator of the rotary tool 1 to select a target rotation speed, and outputs a rotation speed selection signal indicating the selected target rotation speed to the feedback control unit 19. For example, the switch 17 is a rocker switch that is attached to the upper portion of the handle 18, and can be switched in stages so that the target rotational speed corresponds to the outer diameter of the drill 2.

The feedback control unit 19 performs feedback control of the drive motor 13 so as to maintain a target rotation speed corresponding to the measurement rotation speed measured by the sensor 15 and the outer diameter of the drill 2. In the present embodiment, the feedback control unit 19 receives a feedback signal from the sensor 15 and a rotation speed selection signal from the switch 17. As the feedback control, the feedback control means 19 increases the current applied to the drive motor 13 when the measured rotation speed indicated by the feedback signal is equal to or less than the target rotation speed of the rotation speed selection signal.

Next, the portable circulation filter device 50 will be described with reference to fig. 1 and 2.

The portable circulation filter device 50 includes, inside the housing 51: a water tank 52, a storage filter unit 54, a partition 57, a suction pump 53, a supply pipe 56, a supply pump 55, a switching power supply 61, and a control board 60. In the portable circulation filter device 50, two spaces, i.e., a first space case 51A and a second space case 51B, are partitioned by a partition plate 57 inside the case 51. Further, the portable circulation filter device 50 includes, at the bottom of the housing portion 51 (second space housing portion 51B): a wheel for moving the portable circulation filter device 50. The portable circulation filter device 50 is detachably provided with a first space case portion 51A and a second space case portion 51B. For example, the first space case 51A and the second space case 51B are detachably sealed by a rubber packing such as an O-ring or a mounting metal such as a punching sheet.

The first space housing portion 51A houses the suction pump 53, the supply pump 55, the switching power source 61, and the control board 60, and a first connection portion 58 connected to the tip of the supply hose 41 for supplying the lubricating water LW to the rotary tool 1 is formed outside the housing. The second space housing portion 51B houses the water tank 52 and the filter portion 54, and forms a second connection portion 59 connected to the tip of the suction hose 42 for sucking the sludge G from the rotary tool 1 outside the housing. The partition plate 57 is engaged with the first space case 51A.

The water storage tank 52 is formed by the lower side portion of the second space housing portion 51B. The water storage tank 52 stores the lubricating water LW supplied to the rotary tool 1 (water guide drum 3) through the supply hose 41, and stores the lubricating water LW after filtering the sludge G. The water tank 52 may be provided in the second space housing portion 51B with a box-shaped structure having an opening formed in the upper portion thereof, separately from the second space housing portion 51B.

The storage filter portion 54 is a filter that is provided in an upper portion of the water storage tank 52, stores the sludge G recovered by the suction hose 42, and filters the lubricating water LW from the sludge G. The filter filters the sludge G to allow the lubricating water LW to pass therethrough, and allows the filtered lubricating water LW to pass outside the filter and be stored in the water storage tank 52. For example, the storage filter unit 54 is a bag filter that filters the lubricating water LW from the sludge G and stores the powder, and is detachably attached to the wall surface of the second space housing portion 51B such that the opening of the bag filter covers the center tube 43 protruding into the second space housing portion 51B. In addition, the center tube 43 is connected to the suction hose 42 through a second connection portion 59. By configuring the housing filter unit 54 with a bag filter in this way, the lubricating water LW can be filtered from the sludge G, and the powder accumulated inside can be disposed of together with the filter. Further, the housing filter unit 54 can be preferably disposed at a position of a predetermined height by a support arm provided on the inner wall of the second space case 51B.

The partition plate 57 partitions the housing portion 51 into two parts, is provided above the housing filter portion 54, and partitions it into a first space housing portion 51A housing the control board 60 and the like and a second space housing portion 51B having the water tank 52.

As shown in fig. 2, since the first space case 51A and the second space case 51B of the case 51 can be completely separated by the partition plate 57, for example, when the lubricating water LW is replenished to the water storage tank 52, the lubricating water LW does not adhere to the control board 60 due to scattering of the lubricating water LW. As a result, the control board 60 can be prevented from short-circuiting. The partition plate 57 is formed with a through hole 57a through which the supply pipe 56 is inserted and a support hole 57b for supporting the suction pump 53, and is detachably attached to the first space housing portion 51A.

The suction pump 53 is provided inside the first space housing portion 51A, and is provided so that a part of the pump is exposed to the second space housing portion 51B through the support hole 57B. The suction pump 53 is provided so as to penetrate the partition plate 57 and be supported by the support hole 57B, and forms a negative pressure inside the second space housing portion 51B, thereby sucking the sludge G generated in the rotary tool 1 (inside the water receiving guide drum 3) together with the air inside the water receiving guide drum 3 through the suction hose 42. The suction pump 53 is, for example, a vacuum pump. The sludge G sucked by the suction pump 53 is received in the receiving filter portion 54 through the center pipe 43 connected to the suction hose 42 via the second connection portion 59.

The supply pipe 56 is inserted through a through hole 57a penetrating the partition 57, is provided inside the housing portion 51 (the first space housing portion 51A and the second space housing portion 51B), has one end positioned inside the water tank 52 (the second space housing portion 51B), and has the other end connected to the first connection portion 58 (the first space housing portion 51A). The supply pipe 56 supplies the lubricating water LW from the water storage tank 52 to the supply hose 41 connected to the first connection portion 58 through the supply pump 55.

The supply pump 55 is provided inside the first space housing portion 51A, and supplies the lubricating water LW stored in the water storage tank 52 to the rotary tool 1 (water receiving guide drum 3) through the supply pipe 56 and the supply hose 41. The supply pump 55 is, for example, a gear pump, and is formed so as to be able to feed a predetermined amount of the lubricating water LW to the water receiving guide drum 3 through the supply hose 41. For example, the supply pump 55 is a supply pump capable of supplying the lubricating water LW to the water receiving section guide drum 3 at 0.1 to 0.7 MPa.

The control board 60 is provided inside the first space housing portion 51A, is electrically connected to the tool body 10 (rotary tool 1), the suction pump 53, and the supply pump 55, detects the driving of the tool body 10, and controls the suction pump 53 and the supply pump 55 to be driven (see fig. 4).

Specifically, the control board 60 controls the suction pressure of the suction pump 53, controls the negative pressure inside the housing filter unit 54, and controls the recovery amount of the sludge G from the water-receiving guide drum 3 to the housing filter unit 54. Further, the control board 60 controls the pressure of the supply pump 55, and controls the supply amount of the lubricating water LW from the water storage tank 52 to the water-receiving guide drum 3. By these controls, it is possible to prevent a decrease in the efficiency of the boring work performed by the rotary tool 1.

The rotational speed of the drive motor 13 of the tool body 10 is controlled by a control board 20 (feedback control means 19) of the tool body 10.

The switching power supply 61 is a circuit for converting an ac power supply into a dc power supply, and an example thereof is shown in fig. 5.

The switching power supply 61 is a circuit including a rectifier bridge 62,

electrolytic capacitors

63 and 67, a switching element 64, a high-frequency transformer 65, a diode 66, and a control circuit 68.

In the switching power supply 61, a rectifier bridge 62 to which ac power is input from a power supply 70 and an electrolytic capacitor 63 are arranged in parallel on the primary side with a high-frequency transformer 65 interposed therebetween, and a switching element 64 is arranged in series. In the switching power supply 61, a diode 66 is arranged in series on the secondary side of the high-frequency transformer 65, and an electrolytic capacitor 67 is arranged in parallel. Further, in the switching power supply 61, the control circuit 68 controls the timing of on/off of the switching element 64.

Next, the operation principle of the switching power supply 61 is described with reference to fig. 4 and 5.

When ac power is input from the power supply 70 to the primary side of the switching power supply 61, it is rectified by the rectifier bridge 62 and smoothed by the electrolytic capacitor 63 to dc power. Then, the dc power is switched by the switching element 64, that is, the switching is repeated, so that the dc power is converted into a high-frequency ac power and is transmitted to the secondary side by the high-frequency transformer 65. The transmitted ac power is rectified by a diode 66, smoothed by an electrolytic capacitor 67, converted into dc power, and output. In addition, the switching of the switching element 64 is adjusted by the control circuit 68 so that the output voltage is kept constant.

Since the dc power with a small voltage variation flows through the control board 60 by the switching power supply 61, the suction pump 53 and the supply pump 55 can be driven by the dc power, and the control board 60 can be prevented from being burned. Further, since the size of the control board 60 can be reduced by the switching power supply 61, the portable circulation filter device 50 can be reduced in weight and size, the efficiency of the punching operation can be improved, and the punching operation can be easily performed in a narrow place.

In the punching work in the construction work in which the movement is large and the movement is three-dimensional, and mainly in a part of the tile falling prevention work, the suction pump 53 and the supply pump 55 are driven by the direct current supplied from the switching power supply 61 because the portable circulation filter device 50 is small, lightweight, and easy to carry. On the other hand, in a flat and less-moved drilling work such as civil engineering work or a deep hole drilling work for a dam or the like, only the supply pump 55 is driven by direct current, and the suction pump 53 is driven by alternating current. Since such a portable circulation filter device 50 is heavy and difficult to move, it is necessary to install the device for use, but a suction pump 53 having a strong suction force can be used.

Next, the operation of the portable circulation filter device 50 will be described.

The portable circulation filter device 50 is carried to the vicinity of the processing surface of the workpiece WK, and the worker operates the rotary tool 1 to perform the punching operation on the workpiece WK.

The operator drives the rotary tool 1 to drive the portable circulation filter device 50 in conjunction therewith. In the control board 60 of the portable circulation filter device 50, the ac current flowing through the rotary tool 1 is detected, and the suction pump 53 and the supply pump 55 are driven. In the portable circulation filter device 50, the lubricating water LW stored in the water storage tank 52 is supplied to the water receiving supply portion 5 of the water receiving guide drum 3 of the rotary tool 1 through the supply hose 41, and the air inside the water receiving guide drum 3 is sucked through the suction hose 42 by making the inside of the second space housing portion 51B of the housing portion 51 negative pressure.

Further, the rotary tool 1 and the portable circulation filter device 50 may be driven separately without interlocking the rotary tool 1 and the portable circulation filter device 50. In the operation of drilling a deep hole of a number m or more, when the rotary tool 1 and the portable circulation filter device 50 are interlocked, the portable circulation filter device 50 may be driven first so as not to catch up with the sludge G sucked from the rotary tool 1 to the portable circulation filter device 50, and the rotary tool 1 may be driven with a time difference.

In the rotary tool 1, when the lubricating water LW is supplied from the portable circulation filter device 50 to the water receiving portion 5 through the supply hose 41, the lubricating water LW is filled around the water receiving hole of the rotating shaft 11 disposed inside the water receiving guide drum 3. Further, the lubricating water LW is supplied from the water receiving hole of the rotary shaft 11 to the drill 2 through a flow path provided in the connecting shaft 12. Thereafter, the lubricating water LW is used for drilling by the drill 2, and the lubricating water LW is sent out to the inside of the water-receiving guide cylinder 3 together with the cutting powder (sludge G) of the workpiece WK drilled by the drill 2.

In the portable circulation filter device 50, when the rotary tool 1 performs the punching operation, the lubricating water LW and the sludge G in the water guide tube 3 are sucked and collected into the storage filter portion 54 because the suction pump 53 always sucks the lubricating water from the suction hose 42. In the portable circulation filtration device 50, the lubricating water LW is filtered from the sludge G in the storage filter portion 54. In the portable circulation filter device 50, the filtered lubricating water LW is stored in the water tank 52, and the lubricating water LW is supplied from the water tank 52 to the inside of the water-receiving guide drum 3 through the supply hose 41 by the supply pump 55, thereby circulating the lubricating water LW.

The portable circulation filter device according to the present invention is used not only for rotary tools such as a drill for performing a drilling operation, but also for rotary tools such as a grinder for performing a grinding or cutting operation on a workpiece. In a portable circulation filter device using a rotary tool such as a grinder, only a supply pump is driven by direct current, and a suction pump is driven by alternating current. In such a portable circulation filtration device, although the device is heavy and must be installed for use, a suction pump having a strong suction force may be used.

As shown in fig. 6, for example, a rotary tool (grinding machine) 100 is a rotary tool for performing grinding or cutting work to which a disk-shaped turning wheel 108 protruding in one direction at the center is detachably attached. The rotary tool 100 includes: the dust collector includes a tool body 101, an output shaft 102 for rotating a rotor 108 provided in the tool body 101, and a dust collection cover 103 for covering one side surface of the rotor 108 attached to the output shaft 102.

The tool body 101 includes, in the same manner as the tool body 10 (see fig. 3) of the rotary tool (drill) 1, in a housing of the tool body 101: a power transmission mechanism, a drive motor, a sensor (measuring unit), a switch (rotation speed selecting unit), and a feedback control unit. Details are as described above.

The dust collection cover 103 covers one side surface of the rotor 108 to prevent scattering of dust during processing, and includes: a cover body 104 through which the output shaft 102 passes, and a movable side surface portion 106 provided to move up and down along the circumferential surface of the cover body 104. The dust collection cover 103 may be provided so as to penetrate the output shaft 102 so as to be centered on the cover body 104, or may be provided so as to penetrate the output shaft 102 at an eccentric position so that the outer peripheral edge of the rotation wheel 108 is close to the front end of the dust collection cover 103.

As an example, the cover main body 104 is formed so as to penetrate the substantially central output shaft 102. The cover body 104 has a third connection portion 105a for connecting the tip of the supply hose 41 for supplying lubricating water and a fourth connection portion 105b for connecting the tip of the suction hose 42, and the suction hose 42 sucks dust and lubricating water (sludge) during processing. The third connecting portion 105a and the fourth connecting portion 105b are formed at positions opposing each other across the output shaft 102. The third connecting portion 105a and the fourth connecting portion 105b are formed at positions spaced apart from each other on the left and right sides of the output shaft 102.

The cover body 104 is formed in an annular shape, and covers the side surface side of the rotor 108 together with the movable side surface portion 106 when the rotor 108 is attached, thereby preventing scattering of dust due to processing.

A splash nozzle 107 is attached to the cover main body 104. The splash nozzle 107 sprays the lubricant in the form of mist on the back surface of the rotor 108 and the processing surface of the workpiece WK. The splash nozzle 107 is attached to a position communicating with the supply hose 41 via a third connection portion 105 a.

The movable side surface portion 106 moves along the cover main body 104 in a direction (vertical direction) orthogonal to the circumferential direction, and prevents scattering of dust. The movable side surface portion 106 includes:

support portions

106a and 106c provided in the cover main body 104, a biasing portion 106b formed of an elastic member supported between the

support portions

106a and 106c, an annular side surface portion 106d constantly biased downward by the biasing portion 106b, and an abutting portion 106e provided at a lower end of the annular side surface portion 106 d.

The one support portion 106a is provided on the cover main body 104, and supports one end side of the biasing portion 106 b. The other support portion 106c is provided on the annular side surface portion 106d and supports the other end side of the biasing portion 106 b. The

support portions

106a and 106c are arranged in pairs at regular intervals in the circumferential direction of the dust collection cover 103.

The biasing portion 106b is an elastic member such as a coil spring, and constantly biases the annular side surface portion 106d downward. The biasing portion 106b is formed so that the annular side surface portion 106d can move upward against the biasing force when the tool body 101 is pressed toward the workpiece WK by the operation of the operator.

The annular side surface portion 106d is formed to be movable up and down along the circumferential surface of the cover main body 104. The annular side surface portion 106d forms the circumferential side surface of the dust collection cover 103 together with the cover main body 104 and the contact portion 106. The annular side surface portion 106d has a contact portion 106e formed at its lower end.

The contact portion 106e is provided with a brush, as an example, so that the rotary tool 100 can move in contact with the workpiece WK. The contact portion 106e is provided at the lower end of the annular side surface portion 106d by binding thin lines of resin, and forms a brush having the same density in the circumferential direction. Further, when the brush is formed, it is preferable to increase the density of the abutting portion 106e so that the water sprayed into the dust collection cover 103 does not easily leak out.

The turning wheel 108 is an existing member having a cutting edge or a grinding edge used in a normal cutting or grinding operation on a substrate. The turning wheel 108 includes a portion for processing a substrate and a portion for supporting the portion for processing and attaching to the tool body 101. For example, the rotor 108 is formed so that the center of the substrate protrudes in one direction, and a through hole attached to the output shaft 102 is formed in the center of the protrusion. The rotary wheel 108 has a cutting edge or a grinding edge provided on the circumferential surface of the lower surface of the substrate at predetermined intervals in the circumferential direction.

The operation when the portable circulation filter device 50 is used in the rotary tool (grinder) 100 will be described.

The operator drives the rotary tool 100 and the portable circulation filter device 50, respectively. By driving the portable circulation filter device 50, the lubricating water LW is supplied to the inside of the dust collection cover 103 through the supply hose 41, and the suction of the air and the like inside the dust collection cover 103 is performed through the suction hose 42.

In the rotary tool 100, by rotating the rotary wheel 108, the lubricating water LW sprayed from the water spray nozzle 107 connected to the supply hose 41 is diffused in the dust collection cover 103 and the processing surface of the workpiece WK. The rotary tool 100 presses the dust collection cover 103 toward the workpiece WK while holding the tool body 101, and operates the rotary wheel 108 to abut against the workpiece WK. The rotary tool 100 moves upward as the annular side surface portion 106d and the brush contact portion 106e against the biasing portion 106b of the movable side surface portion 106 by pressing the dust collection cover 103 toward the workpiece WK. When the rotary wheel 108 is in a state of being able to contact the workpiece WK, a machining operation of grinding a machining surface, which is a surface of the workpiece WK, is performed. The sludge G generated by the grinding is collected into the housing filter unit 54 of the portable circulation filter device 50 through the suction hose 42 connected to the dust collection cover 103.

In the portable circulation filter device 50, the lubricating water LW is filtered from the sludge G, and the filtered lubricating water LW is supplied to the inside of the dust collection cover 103 through the supply hose 41, thereby circulating the lubricating water LW. Alternatively, the rotary tool 100 and the portable circulation filter device 50 may be driven in conjunction with each other.

Description of the symbols

1 rotating tool

2 drill bit

3 guided by water

3a cylinder body

3b third connecting part

3c fourth connecting part

4 engaging part

5 water receiving and supplying part

6 moving guide rod

10 tool body

11 rotating shaft

12 connecting shaft

13 drive motor

14 power transmission mechanism

15 sensor (measuring unit)

17 switch (rotating speed selecting unit)

18 handle

19 feedback control unit

20 control substrate

41 supply hose

42 suction hose

43 center tube

50 portable circulating filter device

51 casing part

51A first space housing part

51B second space housing part

52 water storage tank

53 suction pump

54 accommodating filter part

55 supply pump

56 supply pipe

57 baffle

57a through hole

57b support hole

58 first connection part

59 second connecting part

60 control substrate

61 switching power supply

62 rectifier bridge

63 electrolytic capacitor

64 switching element

65 high-frequency transformer

66 diode

67 electrolytic capacitor

68 control circuit

70 power supply

100 rotating tool

101 tool body

102 output shaft

103 dust collecting hood

104 cover body

105a third connecting part

105b fourth connecting part

106 moving side part

106a support part

106b force application part

106c support part

106d annular side surface portion

106e abutting part

107 splash nozzle

108 rotating wheel

G sludge

LW lubricating water

WK is processed.

Claims

1. A portable circulation filter device for supplying lubricating water to a cutting edge of a rotary tool and recovering and filtering sludge in which the lubricating water is mixed with powder generated by processing a workpiece by the rotary tool to use the sludge as the lubricating water,

inside the casing, the device includes: a water storage tank for storing the lubricating water; a storage filter unit disposed at an upper portion of the water tank, and configured to store and filter the sludge; a partition plate disposed above the storage filter unit; a suction pump provided through the partition plate; a supply pipe for supplying the lubricating water; a supply pump that supplies the lubricating water through the supply pipe; a switching power supply that converts the electric power supplied to the supply pump or both the suction pump and the supply pump from an alternating current to a direct current; a control substrate that controls the suction pump and the supply pump;

comprising: a first space housing section formed by partitioning a space including the suction pump, the supply pipe, the supply pump, and the control board by the partition plate; a second space housing part formed by partitioning a space having the water tank, the supply pipe, and the storage filter part by the partition plate;

the first space case portion and the second space case portion are detachably provided.

2. The portable circulation filter device according to claim 1, wherein the first space housing part is formed with a first connection part connected to the supply pipe and connected to a front end of a supply hose that delivers the lubricating water to the rotating means,

the second space housing portion is formed with a second connection portion to which a leading end of a suction hose that sucks the sludge from the rotary tool is connected.

3. The portable circulation filtration device according to claim 1 or 2, wherein the first space housing portion and the second space housing portion are detachably sealed by O-rings.

4. The portable circulation filter device according to any one of claims 1 to 3, wherein the housing filter unit is a bag filter for filtering lubricating water from the sludge and housing powder, and an opening of the bag filter covers a center pipe protruding into the second space housing unit and is detachably attached.

5. The portable circulation filter device according to any one of claims 1 to 4, wherein the rotary tool includes a water receiving guide tube connected to a distal end of a supply hose for transporting the lubricating water and a distal end of a suction hose for sucking the sludge when the cutting edge is a drill for piercing a workpiece, the water receiving guide tube including: a cylinder main body covering a blade tip of the rotary tool; a third connection portion to which the supply hose provided on the proximal end side of the tube main body is connected; and a fourth connection portion to which the suction hose provided on the distal end side of the tube main body is connected.

6. The portable circulation filter device according to any one of claims 1 to 4, wherein the rotary tool includes a dust collection cover connected to a distal end of a supply hose for supplying the lubricating water and a distal end of a suction hose for sucking the sludge when the cutting edge is a rotary wheel for grinding or cutting the workpiece, the dust collection cover including: a cover main body that covers a blade edge of the rotary tool; a third connection portion to which the supply hose is connected; a fourth connection part to which the suction hose is connected; the third connecting portion and the fourth connecting portion are arranged separately from each other.

7. The portable circulation filter device according to any one of claims 1 to 6, wherein the rotary tool includes a feedback control means for controlling the rotational speed of the rotary tool to be maintained at a target rotational speed.

8. The portable circulation filter device according to claim 7, wherein the rotating tool includes a measuring means for measuring a rotation speed of a drive motor for rotating the cutting edge, and the feedback control means increases a current applied to the drive motor when the rotation speed measured by the measuring means is equal to or less than the target rotation speed.