JP2021000670A - Mist recovery device - Google Patents

Abstract

To provide a mist recovery device which can prevent mist from discharging to the outside of a machine tool with less energy consumption.SOLUTION: A mist recovery device includes a suction part which communicates with a processing chamber of a machine tool including a fixing cover and a moving cover covering the processing chamber and sucks mist in the processing chamber, and a control part which changes a suction amount of the suction part according to an opening degree of the moving cover.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mist recovery device, particularly a mist recovery device installed in a machine tool.

When a workpiece is machined using coolant in the machining chamber of a machine tool, the coolant warmed by the machining becomes mist and fills the machining chamber. Therefore, if the door of the processing chamber is opened immediately after the processing is completed, the mist is discharged to the outside of the machine tool. Such mist has an adverse effect on the human body, and when it cools outside the machine tool and returns to a liquid, it adheres to the floor surface of the factory and pollutes the inside of the factory.
To solve this problem, a device is provided to prevent the mist from scattering out of the machine tool when the door of the processing chamber is opened. Such devices are provided using various methods, for example, by opening a solenoid valve to release air when the door is opened and forming an air curtain covering the opening. There is a device that prevents the mist from being released to the outside of the machine tool (see, for example, Patent Document 1).

Jikkenhei No. 6-376742

Since the output of the device described in Patent Document 1 is constant regardless of the opening degree of the door, the energy consumption is also constant regardless of the opening degree of the door. Therefore, even if the opening degree of the door is small and the mist is difficult to be released to the outside of the machine tool, a certain amount of energy is consumed, which causes a problem of poor energy efficiency.

Therefore, an object of the present invention is to provide a mist recovery device capable of preventing mist from being released to the outside of a machine tool with low energy consumption.

The mist collecting device according to one aspect of the present invention is
A suction unit that communicates with the processing chamber of a machine tool having a fixed cover and a moving cover that cover the processing chamber and sucks mist in the processing chamber.
A control unit that changes the suction amount of the suction unit according to the opening degree of the moving cover is provided.

The mist recovery device configured as described above can prevent the mist from being released to the outside of the machine tool with a small amount of energy consumption.

It is a perspective view of the machine tool to which the mist recovery device which concerns on Embodiment 1 is attached, and is the figure which the moving cover is closed. FIG. 5 is a perspective view of a machine tool to which the mist collecting device according to the first embodiment is attached, and is a view in which a moving cover is opened. It is a block diagram which shows the structure of the mist recovery apparatus which concerns on Embodiment 1 attached to a machine tool. It is a flowchart which shows an example of the control process of the mist recovery apparatus which concerns on Embodiment 1. It is a flowchart which shows an example of the control process of the mist recovery apparatus which concerns on Embodiment 1. FIG. 5 is a perspective view of a machine tool to which the mist collecting device according to the second embodiment is attached, and is a view in which a moving cover is opened. It is a block diagram which shows the structure of the mist recovery apparatus which concerns on Embodiment 2 attached to the machine tool. It is a flowchart which shows an example of the control process of the mist recovery apparatus which concerns on Embodiment 2. It is a flowchart which shows an example of the control process of the mist recovery apparatus which concerns on Embodiment 2. It is a flowchart which shows an example of the control process of the mist recovery apparatus which concerns on Embodiment 2.

Hereinafter, embodiments and examples for carrying out the present invention will be described with reference to the drawings. The mist collecting device described below is for embodying the technical idea of the present invention, and the present invention is not limited to the following unless otherwise specified.
In each drawing, members having the same function may be designated by the same reference numerals. Although it may be divided into embodiments and examples for convenience in consideration of explanation of the main points or ease of understanding, partial replacement or combination of the configurations shown in different embodiments or examples is possible. In the embodiments and examples described later, the description of the matters common to the above will be omitted, and only the differences will be described. In particular, similar actions and effects with the same configuration will not be mentioned sequentially for each embodiment or embodiment. The size and positional relationship of the members shown in each drawing may be exaggerated for the sake of clarity.

1. 1. Embodiment 1
The mist collecting device 1 according to the present embodiment and the machine tool 100 in which the mist collecting device 1 is installed will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of a machine tool 100 to which the mist collecting device 1 according to the first embodiment is attached, and is a view in which the moving cover 106 is closed. FIG. 2 is a perspective view of the machine tool 100 to which the mist collecting device 1 according to the first embodiment is attached, and is a view in which the moving cover 106 is opened.
First, the machine tool 100 will be described.

As shown in FIGS. 1 and 2, the machine tool 100 includes a tool post 108 and a fixed cover 104 and a moving cover 106 that cover the machining chamber 102. The moving cover 106 is a sliding door. The moving cover 106 opens or closes the processing chamber 102 in which the tool post 108 is arranged. The opening side end 106a of the moving cover 106 is in close contact with the door frame 104a of the fixed cover 104 when the moving cover 106 closes the processing chamber 102. In the processing chamber 102, the work 120 is processed by the tool 108a mounted on the tool post 108. The machine tool 100 is controlled by, for example, NC control. A cutting fluid discharge unit 110 is provided in the processing chamber 102, and the cutting fluid is discharged from the cutting fluid discharge unit 110 while the work 120 is being machined. As the cutting fluid, for example, a water-insoluble cutting oil, a water-soluble emulsion, and a water-soluble solution are used.

Next, the mist collecting device 1 according to the present embodiment will be described.
As shown in FIG. 3, the mist collecting device 1 includes a suction unit 2 and a control unit 10. The control unit 10 receives a signal from the machine tool control unit 112 and controls the suction unit 2 based on the signal.

(Suction part)
The suction unit 2 has a duct 4 and a suction drive unit 6.
The duct 4 has an opening 4a that opens into the processing chamber 102, and communicates the inside of the processing chamber 102 with the outside of the processing chamber 102. The outside of the processing chamber 102 is, for example, a space outside the machine tool 100. The mist in the processing chamber 102 is discharged to the outside of the processing chamber 102 via the duct 4 by the operation of the suction drive unit 6. The opening 4a is provided on the inner side surface 102a of the processing chamber 102. Preferably, the opening 4a is provided above the inside of the processing chamber 102 and on the inner surface of the processing chamber 102 on the opening start side (right side in FIG. 2). The shape of the opening 4a is, for example, a circle having a diameter of about 10 cm to 30 cm. The opening 4a is covered with a mesh-like cover member 8. The cover member is provided to prevent chips generated during processing from being sucked into the duct 4.
The suction drive unit 6 is composed of, for example, an electric motor, a sirocco fan, a turbo fan, or any other known fan, and the fan is rotated by the drive of the motor to suck the mist in the processing chamber 102. The capacity of the fan ^can be exemplified by 4m ³ / min~90m 3 / min.

(Control unit)
The control unit 10 receives a signal from the machine tool control unit 112 regarding the start / stop of the supply of the cutting fluid and a signal regarding the opening degree a based on the position X of the moving cover 106. The control unit 10 controls the drive of the suction drive unit 6 according to the signal received from the machine tool control unit 112 to control the start / stop of suction of the mist by the suction unit 2 and the suction of the mist by the suction unit 2. Control the increase / decrease of the quantity Q.
Specifically, the control unit 10
(1) Upon receiving the signal for starting the supply of the cutting fluid, the suction drive unit 6 is started to be driven, and the suction unit 2 starts sucking the mist;
(2) When the moving cover 106 is opened before the elapse of a predetermined time after receiving the signal of stopping the supply of the cutting fluid, the suction amount Q of the suction unit 2 is determined according to the opening degree a of the moving cover 106. When the suction drive unit 6 is controlled according to the suction amount Q, a signal with an opening degree a = 0 is received, and a predetermined condition (for example, a predetermined time has elapsed, the humidity is equal to or less than a predetermined value, etc.) is satisfied, suction is performed. The drive of the drive unit 6 is stopped, and the suction of the mist by the suction unit 2 is stopped;
(3) When the moving cover 106 is opened after a lapse of a predetermined time after receiving the signal of stopping the supply of the cutting fluid, the drive of the suction drive unit 6 is stopped, and the suction of the mist by the suction unit 2 is stopped.

The opening degree a of the moving cover 106 is determined according to the position X of the moving cover 106. The position X of the moving cover 106 is the position of the opening side end portion 106a of the moving cover 106. When the position X of the opening side end 106a when the moving cover 106 is closed is 0, and the position X of the opening side end 106a when the moving cover 106 is fully opened is Xmax, the opening degree a when X = 0. Is 0, and when X = Xmax, the opening degree a is 100. The position X of the opening side end portion 106a and the opening degree a are in a proportional relationship. The control unit 10 increases the suction amount Q of the suction unit 2 as the opening degree a of the moving cover 106 increases, and decreases the suction amount Q of the suction unit 2 as the opening degree a decreases.

The suction amount Q (m ³ / min) by the suction unit 2 is determined from the area S (m ² ) of the opening region 114 and the velocity V (m / sec) of the mist discharged from the opening region 114. The opening area 114 is an area formed by the moving cover 106 and the fixed cover 104 when the moving cover 106 is opened. The area S (m ² ) of the opening region 114 is the width W (corresponding to the position X of the moving cover 106) (m) of the opening region 114, the depth D (m) of the opening region 114, and the height of the opening region 114. It is calculated from H (m) by S (m ² ) = W (m) × (D (m) + H (m)). The mist speed V (m / sec) is set to 0.25 m / sec or more and 0.5 m / sec or less according to the capacity of the processing chamber 102. From these areas S (m ² ) and velocity V (m / sec), the suction amount Q is calculated by Q (m ³ / min) = S (m ² ) × V (m / sec) × 60.

An example of the control flow of the mist collecting device 1 according to the present embodiment will be described with reference to FIGS. 4A and 4B. 4A and 4B are flowcharts showing an example of the control process of the mist collecting device according to the first embodiment.

In the flowchart of FIG. 4A, first, it is determined whether or not the supply of the cutting fluid is started (step S2). Whether or not the supply of the cutting fluid is started is determined based on the signal from the machine tool control unit 112. If it is determined by this determination that the supply has not started (NO), the determination process in step S2 is repeated. That is, it is in a standby state until the start of supply is detected. When it is determined in step S2 that the supply has started (YES), the control unit 10 starts driving the suction drive unit 6 (step S4). The suction amount Q at this time is the initial suction amount Q0.

Next, it is determined whether or not the supply of cutting fluid has been stopped (step S6). Whether or not the supply of cutting fluid is stopped is determined based on the signal from the machine tool control unit 112. If it is determined by this determination that the supply is not stopped (NO), the determination process of step S6 is repeated. When it is determined in step S6 that the supply is stopped (YES), it is subsequently determined whether or not the moving cover 106 has been opened (step S8). Whether or not the moving cover 106 is opened is determined by whether or not a signal with an opening degree a ≠ 0 is received from the machine tool control unit 112. When it is determined in step S8 that the moving cover 106 is not opened (NO) (when the control unit 10 does not receive the signal of a ≠ 0), it is determined whether or not a predetermined time t has elapsed (step). S7). If it is determined in step S7 that the predetermined time t has not elapsed (NO), step S8 is repeated. If it is determined in step S7 that the predetermined time t has elapsed (YES), the driving of the suction driving unit 6 is stopped, and the suction of the mist is stopped (step S28). When it is determined in step S8 that the moving cover 106 is opened (YES) (when the control unit 10 receives a signal of a ≠ 0), the suction unit 2 sucks according to the opening degree a of the moving cover 106. The suction amount Q of the mist to be used is determined (step S10).

Next, it is determined whether or not the moving cover 106 has stopped (step S12). This is determined by whether or not the opening degree a has come to maintain a constant value. If it is determined in step S12 that the moving cover 106 is not stopped (NO) (a ≠ constant value), step S10 and step S12 are repeated. When it is determined in step S12 that the moving cover 106 has stopped (YES) (a = constant value), the suction amount Q corresponding to the opening degree a at that time is maintained (step S14).

Next, it is determined whether or not the moving cover 106 has been moved again (step S16). This is determined by whether or not the opening degree a has been changed. If it is determined in step S16 that the moving cover 106 is not moved (NO) (a = constant value), step S16 is repeated. When it is determined in step S16 that the moving cover 106 has been moved (YES) (a ≠ constant value), the suction amount Q of the mist sucked by the suction unit 2 is changed according to the opening degree a (step S18). ).

Next, it is determined whether or not the moving cover 106 has stopped (step S20). If it is determined in step S20 that the moving cover 106 is not stopped (NO) (a ≠ constant value), step S28 and step S20 are repeated. When it is determined in step S20 that the moving cover 106 has stopped (YES) (a = constant value), it is determined whether or not the moving cover 106 is in the closed state (step S22). The closed state of the moving cover 106 is when the opening degree a = 0. If it is determined in step S22 that the moving cover 106 is not in the closed state (NO) (a ≠ 0), steps S14 to S22 are repeated. When it is determined in step S22 that the moving cover 106 is in the closed state (YES) (a = 0), the suction amount Q is returned to the initial suction amount Q0 (step S24).

Next, it is determined whether or not the predetermined time t has elapsed (step S26). If it is determined in step S26 that the predetermined time t has not elapsed (NO), step S26 is repeated. If it is determined in step S26 that the predetermined time t has elapsed (YES), the drive of the suction drive unit 6 is stopped, and the suction of the mist is stopped (step S28).

The mist collecting device 1 configured as described above communicates with the processing chamber 102 of the machine tool 100 including the fixed cover 104 covering the processing chamber 102 and the moving cover 106, and sucks the mist in the processing chamber 102. It is characterized by including a unit 2 and a control unit 10 that changes the suction amount Q of the suction unit 2 according to the opening degree a of the moving cover 106.

(effect)
In the mist collecting device 1 described above, the control unit 10 changes the suction amount Q of the suction unit 2 according to the opening degree a of the moving cover 106. As a result, the energy consumption of the mist recovery device 1 can be changed according to the opening degree a of the moving cover 106, and the excessive energy consumption can be reduced.

Further, the opening 4a of the duct 4 is attached in the vicinity of the opening side end 106a of the fixed cover 104 or the moving cover 106. This makes it particularly easy to collect the mist in the vicinity of the opening side end portion 106a, and when the moving cover 106 is opened, it is possible to suppress the release of the mist to the outside of the processing chamber 102.

Further, since the opening 4a of the duct 4 is covered with the mesh-like cover member 8, it is possible to prevent the suction portion 2 from sucking chips and the like flying in the processing chamber 102.

2. 2. Embodiment 2
Next, the mist recovery device 201 according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view of the machine tool 100 to which the mist collecting device 201 according to the second embodiment is attached, and is a view in which the moving cover is opened. FIG. 6 is a block diagram showing the configuration of the mist collecting device 201 according to the second embodiment attached to the machine tool 100.
The mist recovery device 201 according to the second embodiment is different from the mist recovery device 1 according to the first embodiment in that the humidity sensor 12 is provided.

As shown in FIG. 5, the humidity sensor 12 is arranged in the processing chamber 102. Further, as shown in FIG. 6, the humidity sensor 12 sends a signal about the humidity in the processing chamber 102 to the control unit 10. The control unit 10 changes the suction amount Q of the suction unit 2 according to the humidity in the processing chamber 102 detected by the humidity sensor 12.

7A to 7C show a flowchart showing an example of the control process of the mist collecting device 201 according to the second embodiment of the present invention.
The control process of the mist collecting device 201 according to the present embodiment is when the mist is sucked at the initial suction amount Q0 (see step S204 and step S232) and when the suction amount Q is changed according to the opening degree a (step S212). , Step S218, and step S224), and the suction amount Q is corrected according to the humidity in the processing chamber 102 measured by the humidity sensor 12 (step S206, step S214, step S220, step S226, and step S234). Reference) The point is different from the control process of the mist recovery device 1 according to the first embodiment. The correction method is, for example, a method of increasing or decreasing the suction amount Q in proportion to the humidity, a method of increasing or decreasing the suction amount Q in proportion to the difference between the measured humidity and an arbitrary reference value, and a method in which the humidity sets an arbitrary upper limit threshold. If it exceeds, there are a method of increasing the suction amount Q by a predetermined amount, a method of decreasing the suction amount Q by a predetermined amount when the humidity exceeds an arbitrary lower limit threshold, and the like.

In the illustrated step S236, it is determined whether or not the predetermined time t has elapsed, but the present invention is not limited to this. For example, it is determined whether or not the humidity in the processing chamber 102 is equal to or less than the predetermined humidity y, and when it is determined that the humidity is equal to or less than the predetermined humidity y (YES), the drive of the suction drive unit 6 is stopped. The suction of mist may be stopped.
Further, in step S206, step S214, step S220, step S226, and step S234 for correcting the suction amount Q due to humidity, all five steps may not be performed. For example, it may include at least one of the five steps. However, it is particularly desirable that step S206 be carried out. Further, the step of correcting the suction amount Q due to humidity may be performed at a timing other than the timing shown above.

(effect)
The mist collecting device 201 corrects the suction amount Q of the suction unit 2 according to the humidity in the processing chamber 102. As a result, the mist filling the processing chamber 102 can be efficiently recovered.

In the first and second embodiments, the mist collecting devices 1 and 201 are provided with the control unit 10, but the present invention is not limited to this. For example, the mist collecting devices 1 and 201 may not have the control unit 10, and the machine tool control unit 112 may have the function of the control unit 10 described above.

Note that, in FIG. 2 showing the first embodiment and FIG. 5 showing the second embodiment, the machine tool 100 is shown as a lathe machine, but the present invention is not limited to this. The machine tool 100 may be any type of machine tool, including, for example, a machining center or a grinding machine.

Although the embodiments of the present invention have been described above, the disclosed contents may be changed in the details of the configuration, and changes in the combination and order of the elements in the embodiments deviate from the requested scope and ideas of the present invention. It can be realized without.

1,201 Mist recovery device 2 Suction part 4 Duct 4a Opening part 6 Suction drive part 8 Cover member 10 Control part 12 Humidity sensor 100 Machine tool 102 Processing room 102a Inner side surface 104 Fixed cover 104a Door frame 106 Moving cover 106a Opening side end 108 Tool post 108a Tool 110 Cutting fluid discharge part 112 Machine tool control part 114 Opening area 120 Work a Opening degree t Time y Humidity D Depth H Height Q Suction amount Q0 Initial suction amount W Width X position

Claims (5)

A suction unit that communicates with the processing chamber of a machine tool having a fixed cover and a moving cover that cover the processing chamber and sucks mist in the processing chamber.
A mist collecting device including a control unit that changes the suction amount of the suction unit according to the opening degree of the moving cover. The suction portion includes a duct that connects the processing chamber and the outside of the processing chamber.
The duct has an opening that opens into the processing chamber.
The mist collecting device according to claim 1, wherein the opening is provided in the vicinity of the opening start end of the fixed cover or the moving cover in the processing chamber. The mist collecting device according to claim 1 or 2, wherein the opening is covered with a mesh-like member. The mist collecting device according to any one of claims 1 to 3, wherein the control unit increases the suction amount of the suction unit as the opening degree increases. It has a humidity sensor arranged in the processing chamber and has
The mist according to any one of claims 1 to 4, wherein the control unit changes the suction amount of the suction unit according to the humidity in the processing chamber detected by the humidity sensor. Recovery device.

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