JPS63107710A - Continuous filter - Google Patents

Abstract

PURPOSE:To filter at a high speed and minimize filter medium consumption effectively by pressurizing solution to be treated by a raw water pump and depressurizing a filter tank by a vacuum pump. CONSTITUTION:A raw water pump 11 is mounted on a raw water tank 1, and a filtrate pump 41, a filtrate level switch 43 and a vacuum pump 44 are mounted on a filtrate tank 4. When clogging of a filter medium 3 is increased and the level of filtrate is lowered down to a given level, said state is sensed by said switch 43. Then, the delivery of coolant is stopped by a controller 6, and by backflowing the coolant remaining in an upper treatment case 23 to a raw water tank 1 and lifting up the upper treatment case 23, filtering surface 22 is released. The filter medium 3 corresponding to the length of the filtering surface 22 is taken up, a new filter medium section being placed on the filtering surface 22, and the filter medium 3 is contact bonded with a lower filter case 21, the coolant being delivered into the treatment case 23 to start regular filtration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filtration device. More specifically, the present invention relates to a filtration device that can continuously supply filter media to the filtration surface of the filtration device.

, [Prior Art] In precision grinding in the precision industry, it is necessary to effectively and efficiently filter lubricants, including the minute grinding debris generated.
It is requested to do so.

To deal with this, Mitsubishi Kakoki Co., Ltd. has proposed a filter paper-based filtration device, such as an automatic filter paper exchange type pressurized filter that can automatically replace the filter paper and can cope with factory-wide factory automation. .

[Problem that the invention seeks to solve]

However, the automatic filter paper exchange type pressurized filter proposed by Mitsubishi Kakoki Co., Ltd. automatically sends out the filter paper from the filter surface and replaces it with a new filter paper whenever the filter paper becomes clogged. It is configured to xx
xxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxx
x Therefore, an object of the present invention is to provide a filtration device that can operate efficiently and at high speed, and can minimize the amount of filter media consumed.

[Means for solving problems]

The object of the present invention is to provide a raw water tank for storing a treatment liquid;
A filtration mechanism that filters a treated liquid sent from the raw water tank by a raw water pump, a filtrate tank that is connected below the filtration mechanism and stores the filtrate, and a controller that controls the operation of the filtration mechanism. A continuous filtration device comprising: a lower filtration mechanism in which the filtration mechanism has a filtration surface disposed substantially horizontally and whose lower part communicates with the filtrate tank; and a supply roller to the filtration surface. a filter medium to be wound on the other winding roller; a winding roller drive mechanism for driving the winding roller; and a winding roller drive mechanism capable of moving up and down to compress or release the filter medium onto the filtering surface of the lower filtration mechanism. and a filtration mechanism drive mechanism that moves the upper filtration mechanism up and down, and the raw water tank includes a raw water pump that sends the treatment liquid to the filtration mechanism. It is provided,
The filtrate tank includes a filtrate pump that sends the filtrate to the outside, a filtrate level switch that detects the level of liquid in the filtrate tank and sends a signal to the controller, and a vacuum that maintains the filtrate tank at negative pressure. A pump is provided, and the controller stops driving the raw water pump and controls the upper part of the raw water pump based on a signal generated by the filtrate level switch when the liquid level in the filtrate tank becomes below a predetermined level. This is achieved by a continuous filtration device characterized by commanding the vertical movement of the filtration mechanism and the winding movement of the filter medium to bring a new portion of the filter medium into contact with the filtration surface to restart the filtration action.

In the continuous filtration device of the present invention, the raw water pump pressurizes the treated liquid, and the power source filtrate tank is brought into a negative pressure state with the vacuum pump, thereby greatly increasing the filtration capacity compared to conventional filtration devices of this type. can be improved.

That is, for example, the filtration area is 25 (J (width) x 45 cm (
In the case of a conventional filtration device with length) = 1125 aJ, the filtration processing capacity was at most 3 Q l /akin, but in the continuous filtration device according to the present invention provided with the same filtration area, the pressurization of 0.5 kg/Ci was By creating a negative pressure state of 0.1 kg/-, it was possible to achieve a filtration process of 1001/sin. Note that placing the filtrate tank in a negative pressure state helps to prevent the filtrate from scattering when the upper filtration mechanism is moved upward to release the filtration surface in order to move the filter medium portion of the filter medium. If pressure is applied only to the treated liquid side, the filtrate surface will be opened and the filtrate will scatter before the filtrate can completely escape from the filter medium.

Further, in the continuous filtration apparatus according to the present invention, the filtrate pump is normally driven at all times to discharge a constant flow of filtrate from the filtrate tank. Therefore, if the filter medium becomes clogged, the liquid level in the filtrate tank will gradually drop, and when the liquid level drops below a certain value, the part of the filter medium that contacts the filter surface will be replaced with a new filter medium part. It is configured. Therefore, the filter medium can be used effectively for a long period of time.

In the continuous filtration device according to the present invention, a raw water level switch is also provided in the raw water tank, and a signal is transmitted to the controller according to the amount of liquid in the raw water tank, and the introduction of the processing liquid that is normally continuously supplied to the raw water tank is stopped. Alternatively, the configuration may be such that the restart can be performed according to instructions from the controller.By doing this, the processing liquid will not overflow from the raw water tank,
Alternatively, it is possible to prevent a situation in which the amount becomes extremely low and the raw water pump sucks in air.

In addition, if the filtrate pump is connected to a controller and the filtrate in the filtrate tank becomes extremely low, the filtrate level switch detects the condition, and the controller can stop or stop the operation of the filtrate pump. It may be configured so that restart can be commanded.

The present invention will be described in detail below with reference to the accompanying drawings showing a preferred embodiment of the continuous filtration bag U according to the present invention.

FIG. 1 shows a schematic front view of an embodiment of a filtration device according to the present invention. In Figure 1, raw water tank 1 is equipped with a polishing machine, etc.
Water containing a lubricant used in the machining machine (hereinafter referred to as coolant liquid) is supplied through a conduit 14. This coolant liquid contains minute grinding debris. A filtrate tank 4 for storing a processing agent coolant liquid that has been filtered to remove grinding debris is arranged adjacent to the raw water tank 1, and the processing agent coolant liquid is sent to the machine via a conduit 42 using a filtrate pump 41. It is circulated and used in the processing machine.

The raw water tank 1 is provided with a raw water pump 11 and a raw water level switch 13 that detects the level of coolant in the raw water tank 1. Coolant liquid is sourced from raw water pump 11
is sent to the filtration mechanism 2 under pressure. A liquid level signal detected by the raw water level switch 13 is transmitted to the controller 6 via a conductor 62.

The filtration mechanism 2 has a filtration surface 22 arranged at a slight inclination, and a lower filtration box 21 whose lower part communicates with the filtrate tank 4 through a conduit 24, and a lower filtration box 21 which is arranged by moving the filtration surface intermittently. The filter medium 3 includes a filter medium 3 and an upper filter box 23 which presses the filter medium 3 against the filter surface 21 and supplies coolant liquid to the filter medium 3 during filtration work. The lower filter box 21
is fixed to the filtration device, but the upper filtration box 23
is configured to be movable up and down. That is, in the illustrated example shown in FIG. 1, an air cylinder 51 is attached to the machine frame (not shown) of the filtration device above the upper filtration box 23.
52 is attached, and the conduit 53 is connected to the air cylinder 51゜52.
, 54 , 55 , the air cylinders 51 , 52 are actuated by opening and closing the valves 56 connected through the filters 3 , 54 , 55 ; can. The valve 56 is connected to a conductor 66
The valve 56 is connected to the controller 6 via the controller 6, and the valve 56 is opened and closed by a signal from the controller 6. The structures of the upper filtration box 23 and the lower filtration 'n21 are those of a normal filtration device through which coolant can pass, and therefore detailed explanations will be omitted. It goes without saying that the structure is such that the processing liquid does not leak when the upper filter box 23 descends and comes into contact with the lower filter box 21 while sandwiching the filter medium 3.

In this embodiment, the filter medium is supplied from a roll-wound supply source 31 supported on a shaft 32 in FIG. 1 to a guide roller 33,
34 to the filtration surface 22 , and then passes through a pair of guide rollers 35 and is arranged to be wound onto a take-up roll 37 . The shaft 36 of the take-up roll 37 is connected to a drive motor 38
When a signal is transmitted from the controller 6 through the conductor 65, the drive motor 38 rotates and the take-up roll 37 winds up the filter medium 3. The winding length of the filter medium 3 at this time may be determined in accordance with the length of the filter surface 22 in the longitudinal direction.

As the filter medium used in the filtration device according to the present invention, any filter medium that can be continuously supplied in the form of a roll, such as paper, woven fabric, or non-woven fabric, can be used. Appropriately selected and used depending on the type of waste to be used.

In order to efficiently remove minute grinding debris, for example, ultrafine fibers with an average fiber diameter of 0.3μ to 3.0μ are randomly intertwined, and the bulk density is 0.3 to 0.6/cffl.
The filter material is a non-woven fabric having a width of at least 100 g/cm when loaded in a direction corresponding to the direction of movement on the filtration device and has a tensile strength when wet, and is filtered under pressure and suction by applying a pressure difference between the front and back sides. let

A raw water pump 41 is disposed in the filtrate tank 4 as described above, and a vacuum pump 44 is connected thereto, so that the filtration action can be performed under negative pressure, that is, in a suction state. Filtering under negative pressure in this manner is useful for increasing the processing speed when removing extremely minute grinding debris by applying pressure to the coolant liquid and using a filter medium having a dense structure. Note that a vacuum (not shown) is preferably provided in the filtrate tank 4 in order to keep the negative pressure constant.

The filtrate tank 4 is provided with a filtrate level switch 43 that detects the level of filtrate in the tank 4, and a signal of the level of the filtrate detected by the filtrate level switch 43 is transmitted to the controller 6 via a conductor 61. I can appreciate it. Note that it is preferable that a conducting wire 63 is provided through which a signal instructing the operation of the filtrate pump 41 can be sent from the controller 6.

Next, examples of the raw water tank 1 and the filtrate tank 4 are shown in FIGS. 2 and 3. The raw water tank 1 shown in FIG. 2 has a depth of t+800 m, a width of f+1600 mm, and a height of g+.
It has a capacity of 350 mm 4481 (in FIG. 2, it is shown vertically for convenience of explanation). A4 in FIG. 3 is a space (52Il) that normally does not contain liquid.

B+ is a space (12B Il) that mainly accommodates the coolant liquid that flows back from the upper filter box 23 when replacing the filter medium, and C+
DI indicates a space (1921) in which the coolant is stored while filtration is being performed, and DI indicates a dead space (761). The positions of the boundaries of each space are H,,M, as shown in Figure 2.

Indicated by Ll.

That is, while the filtration work is being performed, the flow rate of the coolant liquid flowing in from the conduit 14 and the coolant liquid sent out from the raw water pump 11 are almost balanced within the space C1. When replacing the filter media (more precisely, when moving the filter media)
Also, coolant liquid is continuously supplied from the conduit 14. Therefore, the space B is also required to accommodate these newly added coolant liquids. During use of this filtration device, when the coolant liquid level reaches the MI position, the operation of the raw water pump 11 is started via the raw water level switch 13 and the controller 6 and continues thereafter, while the coolant liquid level When the raw water level switch 13 and controller 6 reach the same level,
The raw water pump 11 is stopped via the space D.
1 is dead space. Furthermore, when the liquid level reaches H, a failure alarm is issued, and the supply of coolant liquid to the entire filtration apparatus or the raw water tank 1 is stopped.

The filtrate tank 4 shown in FIG. 3 has the same size and capacity as the raw water tank 1. In Figure 3, A4 is a space that does not contain liquid and has a capacity of 521, and space B4 is a space that does not contain liquid and has a capacity of 128.
Il, space C4 is 381, space D4 is 1282, space E
4 has a dead space capacity of 102 ffi.

As shown in Figure 3, the boundary position of each space is Ha
= Indicated by Ma, M L, and La.

Normal filtration is performed when the filtrate level is between H4 and M4, that is, while the liquid level is in space B4. Therefore, the raw water pump 11 is activated at M4 and coolant is sent to the filtration mechanism 2, and at H4 The operation of the raw water pump 11 is stopped. When the filter media becomes clogged, the filtration rate decreases,
Therefore, the level of the filtrate also decreases, and when the level reaches ML, the filtrate level switch 43 is activated and a signal is sent to the controller 6.
Based on the signal from the source, the operation of the raw water pump 6 is stopped and the filter medium is replaced. The filtrate pump 41 continues to operate even during the replacement work of the filter medium and discharges the filtrate in the filtrate tank 4, so there is a space D in which the filtrate is stored in the meantime.
4 is required. When the temperature drops below the L4 point, the filtrate pump 4
Since there is a risk that air may be sucked into the filtrate pump 41, it is preferable that the filtrate pump 41 is configured to stop at the H4 point.

[Action of the invention]

Next, the main part of the operation of the filtration device according to the present invention will be explained.

The filter medium 3 which is being sandwiched between the upper filter 'R23 and the lower filter box 21 and filtering the coolant gradually becomes clogged with the passage of time. However, at the beginning, even if the filter cloth 3 is partially clogged, the coolant liquid is filtered in other parts, so no rise in the filtrate head is observed. As time passes and the clogging progresses, and the amount of filtrate flowing down from the lower filtration box becomes less than the amount of filtrate being discharged, the filtrate level begins to drop and the liquid level reaches ML (3rd level). figure)
When it reaches this level, it is detected by the filtrate level sensor 43. The signal from the level sensor 43 is transmitted to the controller 6, and the controller 6 sends a signal to the raw water pump 11 to immediately stop feeding the coolant. Upper processing box 4
The coolant liquid remaining in the tank 6 flows back into the raw water tank 1.Next, a signal is sent from the controller 6 to the valve 56, and the air cylinders 51 and 52 are actuated to raise the upper processing box 23 and release the filtration surface 22. Ru. Thereafter, the controller 6 again sends No. 18 to the motor 38 to wind up the filter medium 3 by an amount corresponding to the length of the filter surface 32 and place a new filter cloth section on the filter surface 32. Next, the upper filter box 23 is lowered by a signal from the controller 6 to press the filter medium 3 onto the lower filter box 21, and at the same time, the raw water tank 11 is activated to feed the coolant liquid into the upper filter box 23 and the regular filtration action is started. Ru. Thereafter, by continuously repeating this operation, automatic filtration work is performed.

[Example 1] Using the filtration apparatus shown in FIG. 1, a treatment liquid having the following composition was filtered through the following filter medium.

*Composition of treatment liquid A treatment liquid (coolant liquid) was prepared by grinding iron parts using a double-disc type precision cutting machine. The size of the grinding debris was 10μ or more, mainly 50μ or more, and the amount of the grinding debris was 150 ppm.

*Filter composition used A nonwoven fabric made of polyester fibers with an average fiber diameter of 1.7 μm (about 0.03 d) was used. Weight is 45g/
Po, thickness 0.10m/m, longitudinal tensile strength (dry)
500g/aa, (wet) 450g/am,
It is made in width 300mm and length 300m #'4. This filter has a width of 300m/m (effective width 250m/m)
Installed on a filter surface with a

*Pressure conditions: The maximum pressure applied from the top was 0.5 kg/-, and the reduced pressure from the bottom was 0.1 kg/ci.

Table 1 shows the increase in pressurization pressure and the flow rate of the filtrate at that time.

Below is the margin: 1 After performing filtration for 22 minutes in Table 1, the pressure of pressurization was 0.5 kg/
- Due to the filter cloth pressure loss, the filtration flow rate decreased, and -
The filtration of the figure is complete.

When the filtrate was analyzed, no iron grinding debris was found, and the result was 100%.
It was confirmed that it had accumulated on the filter cloth.

〔Effect of the invention〕

Since the filtration device according to the present invention is configured as described above, it is possible to perform effective filtration work at high speed, and the filter cloth can be used effectively for a long period of time, thereby achieving a reduction in filtration costs. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing one embodiment of a continuous filtration device according to the present invention, and FIG. 2 is a perspective view schematically showing an example of a raw water tank used in the device of FIG. FIG. 3 is a perspective view schematically showing an example of a filtrate tank used in the apparatus shown in FIG. 1. 1... Raw water tank, 2... Filtration mechanism,
3... Filter medium, 4... Filtrate tank, 6... Controller 11... Raw water pump, 13... Raw water level switch, 22... Filtration surface, 38... Filter medium winding motor ,. 41...Filtrate pump, 43...Filtrate level switch, 44...Vacuum pump, 51, 52...Air cylinder. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A raw water tank that stores a treatment liquid, a filtration mechanism that filters the treatment liquid sent from the raw water tank by a raw water pump, and a filtration mechanism connected below the filtration mechanism to accommodate the filtrate. A continuous filtration device comprising a filtration tank and a controller for controlling the operation of the filtration mechanism, wherein the filtration mechanism has a filtration surface disposed substantially horizontally, and a lower portion thereof communicates with the filtrate tank. a lower filtration mechanism, a filter medium supplied from one supply roller to the filtration surface and wound onto the other take-up roller, a take-up roller drive mechanism that drives the take-up roller, and a filtration mechanism of the lower filtration mechanism. an upper filtration mechanism configured to be movable up and down so as to compress or release the filter medium on a surface, and supplying a processing liquid onto the filter medium, and a filtration mechanism drive mechanism that moves the upper filtration mechanism up and down, The raw water tank is provided with a raw water pump that sends the treated liquid to the filtration mechanism, and the filtrate tank includes a filtrate pump that sends the filtrate to the outside, and a pump that detects the liquid level in the filtrate tank. A filtrate level switch that sends a signal to the controller and a vacuum pump that maintains a negative pressure in the filtrate tank are provided; Stopping the drive of the raw water pump based on the signal generated by the filtrate level switch;
A continuous filtration device characterized by commanding the vertical movement of the upper filtration mechanism and the winding movement of the filter medium to bring a new portion of the filter medium into contact with the filtration surface to restart the filtration action.