JP2019181579A - Coolant supply system - Google Patents

Abstract

To stably supply a coolant which is adjusted individually to a target cutting liquid concentration within a predetermined range to each machining tank of a plurality of machine tools connected to a server tank.SOLUTION: A coolant supply system includes a supply server tank 10 which prepares a coolant for supply, and a preparation server tank 11 arranged on an upstream side. Each machining tank 14 of a plurality of machine tools and the supply server tank 10 are connected by a main supply passage 16 and a branch pipe, and the coolant of an appropriate concentration required by a specific machining tank is prepared by the supply server tank 10. The coolant of a relatively low concentration is supplied from the preparation server tank 11 to the supply server tank 10. A concentration of the coolant in the supply server tank 10 is directly measured by a concentration meter 54, and the coolant of the appropriate concentration can be prepared by the supply server tank 10 in a short time.SELECTED DRAWING: Figure 1

Description

The present invention relates to a coolant supply system.

Patent Documents 1 and 2 show coolant supply systems configured to supply coolant from a server tank that stores coolant for supply to each machining tank of a plurality of machine tools installed in a factory or the like. Things are known. However, in these documents, coolant adjusted to an appropriate concentration for each machine tool is supplied from the server tank, individually corresponding to the concentration of the cutting fluid required by the machine tool connected to each machining tank. It wasn't something to do

Further, these documents do not show means for storing the cutting fluid in the coolant in the server tank in a state in which the concentration of the cutting fluid is automatically properly maintained. For example, in Patent Document 1, when the valve body of the variable flow valve is turned from outside the apparatus main body, the downstream side of the valve body of the supply passage and the communication groove of the valve body communicate with each other in proportion to the rotation angle of the valve body. Since the cross-sectional area of the communication groove in the portion changes continuously, the supply amount of the stock solution for cutting fluid can be accurately controlled by rotating the valve body by the required angle, and the mixing ratio of water and the stock solution Can be set to the required value (0 to 30% range), and a person operates a variable flow valve that adjusts the supply amount of the cutting fluid stock solution in advance to determine the blending ratio with water. In addition, the server tank is merely trained according to the mixing ratio of water and the cutting fluid stock solution, and no means for checking and adjusting the actual concentration of the coolant in the server tank is shown.

Japanese Patent Publication No.7-115276 Japanese Utility Model Publication No. 3-47743

According to the present invention, for each machining tank of a plurality of machine tools connected to a server tank, a coolant that is individually adjusted to a target cutting fluid concentration within a predetermined range can be stably supplied to each machining tank. It is an object of the present invention to provide a coolant replenishment system that can be used.

The present invention comprises a main replenishment path connected to a server tank that contains a coolant for supply, and a plurality of replenishment branch pipes branched from the main replenishment path, wherein the branch pipes are each machining of a plurality of machine tools. A coolant replenishing system configured to supply coolant from the server tank to the machining tank connected to a tank and having a reduced coolant amount is provided with the following means.

In the coolant replenishment system of the present invention, the coolant tank includes a stock solution tank that contains a water-soluble cutting fluid that is a stock solution of the coolant, and a water supply source, and the server tank is supplied from the stock solution tank and the water supply source. And adjusting the concentration of the coolant in the server tank to a target concentration required by a specific machining tank among the plurality of machining tanks. The replenishment path includes a flow path control unit that opens only a branch pipe connected to the specific machining tank from a main supply path and closes a branch pipe connected to other than the specific machining tank, and specifies the coolant adjusted to the target concentration. It is characterized in that it can be supplied only to the machining tank.

The server tank may be a single tank, but includes a supply server tank connected to the main supply path and a preparation server tank connected upstream of the supply server tank. It is also possible to implement.

At that time, the supply server tank includes a concentration meter that detects the concentration of the cutting fluid in the coolant in the tank, and supplies the coolant actually measured by the concentration meter to the specific machining tank. It is desirable to do.

The preparation server tank adjusts the supply amount from the stock solution tank and the water supply source to adjust the coolant concentration in the preparation server tank to a preparation concentration lower than the coolant concentration of the supply server tank. It can be implemented as having a preparation concentration adjusting means. This preparation concentration adjustment means can also be adjusted to the preparation concentration by actually measuring the concentration by providing a concentration meter, but at this stage the coolant is not supplied directly to the machining tank, so it is not a concentration meter. You may supply each liquid by adjusting the supply amount from the said undiluted | stock solution tank and the said water supply raw material to the preset flow rate ratio.

Then, a coolant having a preparation concentration is supplied from the preparation server tank to the supply server tank, and the cutting fluid is supplied from the stock solution tank to the supply server tank, and the coolant in the coolant in the supply server tank is supplied. When the concentration meter detects that the concentration has risen to the target concentration, the supply of the cutting fluid from the stock solution tank is stopped to thereby reduce the concentration of the cutting fluid in the coolant in the supply tank to a predetermined target. The coolant is adjusted within the concentration range, and the coolant adjusted automatically within the target concentration range is replenished from the supply server tank to the target machining tank.

Further, the main supply path is configured such that the downstream end thereof is connected to the preparation server tank, and the coolant in the supply path after being supplied to the specific machining tank is returned to the preparation server tank. Thus, it is possible to suppress the concentration of the coolant to be supplied next from being distorted by the coolant remaining in the supply path.

According to the present invention, for each machining tank of a plurality of machine tools connected to a server tank, a coolant that is individually adjusted to a target cutting fluid concentration within a predetermined range can be stably supplied to each machining tank. The coolant replenishment system made possible is provided.

Explanatory drawing of the coolant supply system which concerns on embodiment of this invention. Explanatory drawing of the coolant supply system which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall structure)
The coolant replenishment mechanism according to this embodiment is a coolant tank used in a machine tool (not shown) that mainly performs machining such as cutting and grinding installed in a factory or the like from a server tank. It replenishes stably and automatically at an appropriate concentration kept within a predetermined range.

In this embodiment, the server tank includes a preparation server tank 11 and a supply server tank 10 connected downstream thereof. The coolant, which has been prepared in the preparation server tank 11 in advance to a relatively low cutting fluid concentration, is prepared in the supply server tank 10 to an appropriate concentration required by the specific machining tank 15 as the supply destination, and at an appropriate concentration kept within a predetermined range. The specific machining tank 15 is replenished stably and automatically.

Each machine tool is provided with a machining tank 14, and a branch pipe 17 branched from a main supply path 16 connected to the supply server tank 10 is connected to each machining tank 14. The coolant having the proper concentration held in the tank 10 is replenished as needed as the coolant in the machining tank 14 decreases. At this time, since the appropriate concentration of the coolant is different for each machine tool, the coolant adjusted to the target concentration required by the specific machining tank 15 for replenishing the coolant among the plurality of machining tanks 14 is the server tank (supply server tank 10, preparation server). Prepared in tank 11).

The preparation server tank 11 is supplied with water for dilution from a water supply source 13 connected via a water supply pipe 20, and from the stock solution tank 12 connected via a liquid supply pipe 31 as a stock solution. A water-soluble cutting fluid is supplied. Water and cutting fluid are mixed in the preparation server tank 11 to prepare a coolant having a relatively low cutting fluid concentration.

The supply server tank 10 is supplied with coolant having a relatively low preparation concentration from the preparation server tank 11 connected via the connection pipe 50, and from the stock solution tank 12 connected via the liquid supply pipe 61, Cutting fluid is supplied. The coolant having the preparation concentration and the cutting fluid are mixed in the supply server tank 10, and the coolant having the optimum cutting fluid concentration to be supplied to the specific machining tank 15 is prepared.

The coolant adjusted to the optimum target concentration is supplied from the delivery pipe 25 to the specific machining tank 15 through the main supply path 16 and the branch pipe 17.
In the following description, the diluted cutting fluid is referred to as coolant, and the undiluted raw fluid is referred to as cutting fluid.

(Machining tank 14 and flow path control unit)
A liquid meter 18 is disposed in each machining tank 14, and on-off valves 19 a and 19 b that open and close the flow path of the branch portion of the branch pipe 17 based on the detection result of the liquid meter 18 are provided in the branch pipe 17. ing. One on-off valve 19a is provided in the branch pipe 17, and the other on-off valve 19b is provided in the main supply path 16 downstream of the branch portion. For example, if the No. 2 machining tank 14 is a specific machining tank 15 for supply, all the on-off valves 19a of the branch pipes 17 upstream from the branch pipes 17 to the specific machining tank 15 are closed, and the specific machining tank 15 All the on-off valves 19b of the main supply passage 16 upstream from the branch pipe 17 are opened. Then, the open / close valve 19a of the branch pipe 17 to the specific machining tank 15 is opened, and the open / close valve 19b of the main supply path 16 at the branch portion of the branch pipe 17 to the specific machining tank 15 is closed. As a result, all the coolant in the main supply passage 16 is supplied only to the specific machining tank 15. Instead of using the on-off valves 19a and 19b, a three-way valve may be used.

(Request from specific machining tank 15)
When the liquid meter 18 detects that the coolant of the specific machining tank 15 has been consumed and the liquid level has fallen to a predetermined lower limit L, the detection result is sent to the control unit 39. The control unit 39 gives an opening / closing instruction to the on-off valves 19a and 19b as described above, reads the target concentration of the specific machining tank 15 recorded in advance, and the coolant having the target concentration of the specific machining tank 15 is supplied to the server tank ( It is prepared in the supply server tank 10 and the preparation server tank 11) and supplied from the main supply path 16 and the branch pipe 17 to the specific machining tank 15.

When the liquid level meter 18 of the specific machining tank 15 detects that the liquid level has risen to the predetermined upper limit value H by this replenishment, the on-off valve 19a is closed based on the detection result, and the main replenishment path 16 The coolant supply is stopped. As a result, the amount of coolant having an appropriate concentration in the specific machining tank 15 is kept at an appropriate amount within a predetermined range. In addition, emergency measures such as stopping the machine tool and issuing an alarm in preparation for the case where the coolant level rises above the upper limit above to a dangerous liquid level. It is also preferable to carry out in such a way that it can be taken.

The main supply path 16 is connected to a delivery pipe 25 arranged in the supply server tank 10. The feed pipe 25 is provided with a liquid feed pump 26 that feeds the coolant in the supply server tank 10 to the main replenishment path 16, and the liquid feed pump 26 is actuated by an instruction from the control unit 39. The coolant is sent from the delivery pipe 25 to the main supply path 16.

(Stock solution tank 12)
The stock solution tank 12 is provided with a charging port 30 through which a stock cutting fluid is introduced and a fluid meter 35 is disposed. It is only necessary to manually supply the cutting fluid, and the liquid meter 35 notifies the detection result and prompts the cutting fluid to be input. If necessary, it is possible to automate the introduction of the cutting fluid as the stock solution. Although not shown, an opening / closing valve is provided in the flow path for introducing the stock solution, and the cutting fluid in the stock solution tank 12 is consumed, and the liquid level is reduced to a predetermined lower limit L. When the meter 35 detects, the cutting fluid is introduced based on the detection result, and when the fluid meter 35 detects that the liquid level has risen to the predetermined upper limit value H with supply, the detection result Based on this, the introduction of the cutting fluid can be stopped. In addition, it is also preferable to be able to detect the dangerous value LL in preparation for a case where the liquid level of the cutting fluid is lowered below the lower limit value L to a dangerous amount.

(Liquid level adjusting means for the preparation server tank 11)
A liquid meter 21 is disposed in the preparation server tank 11, and a water opening / closing valve 22 that opens and closes the flow path of the water supply pipe 20 based on the detection result of the liquid meter 21 is provided in the water supply pipe 20. Specifically, the liquid level meter 21 indicates that the coolant having a relatively low preparation concentration in the preparation server tank 11 has been supplied to the preparation server tank 11 from the connection pipe 50 and the liquid level has decreased to a predetermined lower limit L. Is detected, the water on-off valve 22 is opened based on the detection result, and dilution water is supplied from the water supply source 13. When the liquid level meter 21 detects that the liquid level has risen to the predetermined upper limit value H due to this supply, the water on-off valve 22 is closed based on the detection result, and the water supply source 13 supplies water. Stopped. Accordingly, the amount of coolant in the preparation server tank 11 is maintained at an appropriate amount within a predetermined range, and a sufficient amount of coolant that can be supplied to the supply server tank 10 is retained in the preparation server tank 11. it can. It should be noted that the danger level LL can also be detected in preparation for a case where the coolant level has fallen to a dangerous level that is far below the lower limit L, and an alarm is generated by stopping the supply to the machining tank 14. It may be implemented so that emergency measures such as issuing a warning can be taken. The liquid meter 21 can be implemented by determining the amount of liquid in the preparation server tank 11 from the supply and consumption of water such as a flow meter. In this example, the liquid level of the coolant is determined as the liquid meter 21. A float switch for detecting the height is used. As a result, by directly measuring the amount of coolant in the liquid amount meter 21, accurate liquid amount management can be performed with a relatively simple structure.

(Concentration adjusting means for the preparation server tank 11)
The preparation server tank 11 is provided with a stirrer 23 so that water and cutting fluid are uniformly mixed, and a concentration meter 24 is provided. Based on the detection result of the concentration meter 24, a liquid supply pump It is comprised so that the action | operation and stop of 32 may be controlled. Specifically, a liquid supply pump 32 is disposed in a liquid supply pipe 31 that supplies cutting fluid from the raw liquid tank 12 to the preparation server tank 11, and an air supply source 34 supplies air for operating the liquid supply pump 32. An air valve 33 and a pressure adjusting valve 37 are disposed in the air flow path supplied from the air.
When the concentration meter 24 detects that the dilution water is supplied from the water supply source 13 to the preparation server tank 11 and the concentration of the cutting fluid has decreased to a predetermined lower limit value, the air valve 33 is activated based on the detection result. The valve opening state is established, the liquid supply pump 32 is operated, and the open / close valve 36 of the liquid supply pipe 31 connected to the preparation server tank 11 is opened, so that the cutting liquid from the raw liquid tank 12 is supplied. The pressure adjustment valve 37 can adjust the output of the feed pump 32. When it is detected that the concentration has risen to the preparation concentration due to the supply of the cutting fluid, the on-off valve 36 of the liquid supply pipe 31 is closed and the supply of the cutting fluid is stopped. When there is no other operation request, the air valve 33 is also closed, and the liquid supply pump 32 is stopped. As a result, the preparation server tank 11 is maintained in a state where the coolant having the preparation concentration that can be supplied to the supply server tank 10 is maintained in an appropriate amount that does not cause a shortage of supply.

Note that the time during which the state in which the concentration of the cutting fluid exceeds the predetermined upper limit is measured with a timer, and when this state continues for a predetermined time, the water on-off valve 22 is opened based on the detection result of the timer. When the densitometer 24 detects that the water has been supplied from the water supply source 13 and the concentration of the cutting fluid has fallen below the predetermined upper limit value, the water on-off valve 22 is closed, and the water supply is stopped. It may be implemented with additional functions.

(Liquid amount adjusting means of supply server tank 10)
A liquid meter 51 is arranged in the supply server tank 10, and an open / close valve 52 that opens and closes the flow path based on the detection result of the liquid meter 51 is provided in the connection pipe 50. Specifically, when the coolant of the supply server tank 10 is supplied from the delivery pipe 25 to the specific machining tank 15 of the machine tool, and the liquid level meter 51 detects that the liquid level has decreased to a predetermined lower limit L. Based on the detection result, the on-off valve 52 is opened, and a coolant having a relatively low preparation concentration is supplied from the preparation server tank 11. When the liquid level meter 51 detects that the liquid level has risen to the predetermined upper limit value H by this supply, the on-off valve 52 is closed based on the detection result, and the supply of coolant from the preparation server tank 11 is stopped. Stopped. As a result, the amount of coolant in the supply server tank 10 is maintained at an appropriate amount within a predetermined range, and a sufficient amount of coolant to be supplied to the specific machining tank 15 is supplied into the supply server tank 10. In addition, emergency measures such as stopping the machine tool and issuing an alarm in preparation for the case where the coolant level rises above the upper limit above to a dangerous level. It may be carried out so that it can be taken.

In this example, the coolant for one specific machining tank 15 is prepared in the supply server tank 10 and almost all of the coolant is supplied to the specific machining tank 15, and the optimum amount is set at the upper limit value H. ing. Therefore, when the capacity of the machining tank 14 differs depending on the type of each machine tool, the upper limit value H can be changed depending on which machining tank 14 is the specific machining tank 15 to which coolant is supplied. It can also be implemented. As described above, when the liquid meter 18 detects that the coolant of the specific machining tank 15 has been consumed and the liquid level has fallen to the predetermined lower limit L, the detection result is sent to the control unit 39. The controller 39 stores the capacity of each machining tank 14 in advance, sets the upper limit value H of the liquid meter 51 according to the capacity of the specific machining tank 15 to be supplied, and supplies the server tank 10 When the amount of the coolant reaches the upper limit value H, the on-off valve 52 can be closed by a signal from the control unit 39.

(Concentration adjusting means for supply server tank 10)
The supply server tank 10 is provided with a stirrer 53 so that a coolant having a relatively low preparation concentration and the cutting fluid are uniformly mixed, and a concentration meter 54 is provided. Based on the result, the operation and stop of the feed pump 32 are controlled. Specifically, the above-described liquid supply pump 32 is disposed in the liquid supply pipe 61 that supplies the cutting fluid from the raw liquid tank 12 to the supply server tank 10, and air is supplied to operate the liquid supply pump 32. An air valve 33 is disposed in an air flow path supplied from the source 34.
On the condition that the specific machining tank 15 is determined and information such as the appropriate concentration information is determined by the control unit 39, coolant having a preparation concentration is replenished from the preparation server tank 11 to the supply server tank 10, and the cutting fluid is supplied. When the densitometer 54 detects that the concentration of the water has decreased to a predetermined lower limit value based on the appropriate concentration information of the specific machining tank 15, the air valve 33 is opened by the signal of the control unit 39 based on the detection result. While the liquid pump 32 is operated, the on-off valve 62 provided in the liquid supply pipe 61 is opened, and the cutting liquid from the raw liquid tank 12 is supplied.
When the densitometer 54 detects that the concentration has increased to a predetermined upper limit by this supply, the on-off valve 62 is closed based on the detection result, and the supply of the cutting fluid is stopped. As a result, the concentration of the cutting fluid in the coolant in the supply server tank 10 becomes an appropriate value within a predetermined range required by the specific machining tank 15, and a coolant having an appropriate target concentration is prepared in the supply server tank 10. When there is no other operation request, the air valve 33 is also closed, and the liquid supply pump 32 is stopped.

As a result, an appropriate concentration and an appropriate amount of coolant that can be supplied to the specific machining tank 15 are prepared in the supply server tank 10.
Note that the time during which the state in which the concentration of the cutting fluid exceeds the predetermined upper limit is measured with a timer, and when the state continues for a predetermined time, the on-off valve 52 is opened based on the detection result of the timer, A function in which the on-off valve 52 is closed when the concentration meter 24 detects that the concentration of the cutting fluid has fallen below a predetermined upper limit due to the supply of water from the water supply source 13, and the supply of water is stopped. You can also add it.

(Liquid feeding and blow)
When the coolant having the proper concentration and the appropriate amount required by the specific machining tank 15 is prepared in the supply server tank 10, the liquid feed pump 26 is activated, and the target specific machining tank 15 passes through the main supply path 16 and the branch pipe 17. Coolant is supplied. When the supply of the coolant to the specific machining tank 15 is completed, the liquid feed pump 26 is stopped and the coolant remaining in the main supply path 16 is returned to the preparation server tank 11.
When the machining tank 14 for obtaining a different target concentration becomes the next specific machining tank 15, coolant having the target concentration for the new specific machining tank 15 is prepared and supplied in the supply server tank 10. In addition, if the old target concentration coolant prepared for the previous specific machining tank 15 remains in the main supply passage 16, an inappropriate concentration of coolant is supplied to the new specific machining tank 15. There is a risk of being. In order to prevent this, the coolant remaining in the main supply passage 16 is returned to the preparation server tank 11 and then the coolant having the target concentration for the new specific machining tank 15 is supplied to the main supply passage 16. Is.

Specifically, the downstream end of the main supply path 16 is connected to the preparation server tank 11, and the air supply source 34 and the downstream side of the liquid feed pump 26 are connected to each other by a blow passage 45 via an opening / closing valve 46. ing. As a result, the open / close valves 19a of all the branch pipes 17 are closed, and the open / close valves 46 are opened while all the open / close valves 19b of the main supply path 16 are opened, so that the main supply path 16 remains air blown. The coolant that is present can be returned to the preparation server tank 11. A check valve 47 is disposed downstream of the on-off valve 46, and a check valve 48 is also disposed between the junction of the blow passage 45 with respect to the main supply passage 16 and the liquid feed pump 26. ing.

(Summary of operating conditions)
(1) Preparation of low-concentration coolant in the preparation server tank 11 Comparison that can be supplied to the supply server tank 10 in the manner described in the liquid flow path adjustment means and the concentration flow path adjustment means of the preparation server tank 11 described above. The coolant adjusted to a low preparation concentration is prepared and held in the preparation server tank 11.
Here, when the control system is described on the assumption that the valves are normally closed, the liquid amount adjusting means of the preparation server tank 11 is controlled by the control unit 39 from the liquid amount meter 21 when the liquid level meter 21 senses the lower limit value L. (Or via the control unit 39), the valve opening instruction is sent to the water on-off valve 22, and when the liquid level meter 21 senses the upper limit H, the liquid level meter 21 does not pass through the control unit 39 (or A valve closing instruction is sent to the water on-off valve 22 (via the control unit 39). Further, when the concentration meter 24 senses the lower limit value, the concentration adjusting unit of the preparation server tank 11 sends the information to the control unit 39. The control unit 39 sends a valve opening instruction to the air valve 33 and the opening / closing valve 36. When the densitometer 24 senses the upper limit value, the information is sent to the control unit 39, and the control unit 39 sends a valve closing instruction to the air valve 33 and the opening / closing valve 36.

The capacity of the preparation server tank 11 is preferably several times larger than the capacity of the supply server tank 10. The coolant concentration in the preparation server tank 11 is lower than the coolant concentration required by all the machining tanks 14, and is mixed with the cutting fluid stock solution in the supply server tank 10, thereby allowing the specific machining tank 15 to be mixed. Adjust to the appropriate concentration to be supplied. Generally, since the cutting fluid of the raw liquid has a high viscosity, it takes time to send the liquid. However, by preparing a low-concentration coolant in the preparation server tank 11, the liquid supply time to the supply server tank 10 is shortened and supplied. The concentration management in the server tank 10 can be performed appropriately. It should be noted that the coolant concentration in the preparation server tank 11 can be about half the coolant concentration in the supply server tank 10 (about 1/3 to 2/3), but this value can be changed as appropriate. Can be implemented. Further, since it is not necessary to strictly manage the coolant concentration in the preparation server tank 11 as compared with the supply server tank 10, it may be performed only by the flow rate management without using the concentration meter.

(2) Request from the specific machining tank 15 When the coolant of the specific machining tank 15 is consumed as described in the request from the specific machining tank 15, the detection result is sent to the control unit 39. The control unit 39 gives an opening / closing instruction to the on-off valves 19a and 19b as described above, and also supplies the target concentration of the specific machining tank 15 recorded in advance and the coolant to be sent to the specific machining tank 15 set as necessary. Read the amount.

(3) Based on the information related to the specific machining tank 15 of the preparation control unit 39 for the coolant having an appropriate concentration in the supply server tank 10, the specific machining is performed as described in the liquid amount adjusting means and the concentration adjusting means of the supply server tank 10. An appropriate concentration and an appropriate amount of coolant to the tank 15 are prepared.
Here, when the control system is described on the assumption that each valve is normally closed, the liquid amount adjusting means of the supply server tank 10 is controlled by the control unit 39 from the liquid amount meter 51 when the liquid amount meter 51 senses the lower limit value L. When the liquid level meter 51 senses the upper limit value H without passing through the control unit 39 (or via the control unit 39), and when the liquid level meter 51 senses the upper limit value H, the control unit 39 does not pass through the control unit 39 (or control). A valve closing instruction is sent to the on-off valve 52 (via the section 39). Further, the concentration adjusting means of the supply server tank 10 sends the information to the control unit 39 when the concentration meter 54 senses the lower limit value. The control unit 39 sends a valve opening instruction to the air valve 33 and the opening / closing valve 62. When the concentration meter 54 detects the upper limit value, the concentration adjusting means of the supply server tank 10 sends a valve closing instruction to the air valve 33 and the opening / closing valve 62.

(4) Liquid feeding from the supply server tank 10 and the appropriate concentration and appropriate amount of coolant required by the blow specific machining tank 15 are adjusted in the supply server tank 10, and the liquid feeding is performed in the manner described above for liquid feeding and blowing. The pump 26 is operated to supply the coolant to the target specific machining tank 15 through the main supply path 16 and the branch pipe 17. When the supply is completed, the coolant in the main supply path 16 is returned to the preparation server tank 11. Prepare for the next replenishment request.
Here, when the control system is described on the assumption that each valve is normally closed, when the densitometer 54 senses the upper limit value, the control unit 39 sends an operation start instruction to the delivery pump 26 and the on-off valve 19a. , 19b is controlled to open the flow path only to the specific machining tank 15. When the coolant supply to the specific machining tank 15 is completed and the liquid level meter 18 senses the upper limit value, the information is sent to the control unit 39. The control unit 39 sends an operation stop instruction to the delivery pump 26, sends a valve close instruction to all the open / close valves 19a, and sends a valve open instruction to all the open / close valves 19b and the open / close valves 46 to perform blow. Is called.

The remaining coolant in the supply server tank 10 after completion of the supply can be left as it is, and is controlled by the densitometer 54 in response to the request of the next specific machining tank 15, so there is no problem. , It may be returned to the preparation server tank 11 once.

(Example of change)
A stirrer 23 is provided to make the concentration of the cutting fluid in the supply server tank 10 uniform, but a plurality of supply pipes 31 and liquid meters 51 having different heights of the supply ports 43 are provided. It is also preferable to open a plurality of liquid supply ports 43 at different positions with respect to one pipe 31 as shown in FIG. At this time, it is also appropriate to carry out such that the discharge amount from each liquid supply port 43 is larger as the liquid supply port 43 below.

It is appropriate that the measurement position 41 of the densitometers 24 and 54 is arranged in the middle of the effective depth of the preparation server tank 11 and the supply server tank 10, but by providing a plurality of densitometers 24 and 54, etc. It is also desirable to control the supply and stop by the liquid supply pump 32 by providing a plurality of measurement positions 41 of densitometers having different heights and taking the average value of the measurement results based on the measurement results.

Also, when a plurality of supply server tanks 10 are provided for one preparation server tank 11 and a coolant supply request from another machining tank 14 occurs before the coolant supply to the specific machining tank 15 is completed. Alternatively, it is possible to supply a relatively low concentration of coolant to the plurality of supply server tanks 10 so that the coolant can be prepared in parallel.
The liquid amount adjusting means and the concentration adjusting means in each of the tanks 10, 11, 12 and 14 have their respective liquid meters and concentration meters hold information on a predetermined straight line such as an upper limit value and a lower limit value, and detect the values. The control unit may emit a signal at the time, and the control unit performs control based on the signal. The liquid meter or the concentration meter simply detects a numerical value and sends the information to the control unit. Information regarding a predetermined straight, such as a value and a lower limit, may be held, and information based on the straight may be compared with a numerical value from a liquid meter or a concentration meter, and control based on the information may be performed.
In each of the tanks 10, 11, 12, and 14, a liquid level meter 71 and a concentration meter 72 are arranged as necessary, and the values are displayed by the control unit 39, and the values of the concentration meters 24 and 54 are displayed. It doesn't matter.

DESCRIPTION OF SYMBOLS 10 Supply server tank 11 Preparation server tank 12 Stock solution tank 13 Water supply raw material 14 Machining tank 15 Specific machining tank 16 Main supply path 17 Branch pipe 18, 21, 35, 51 Fluid meter 19a, 19b, 36, 46, 52, 62 On-off valve 20 Water supply pipe 22 Water on-off valve 23, 53 Stirrers 24, 54, 72 Concentration meter 25 Delivery pipe 26 Feed pump 30 Feed port 31, 61 Feed pipe 31 Pipe 32 Feed pump 33 Air valve 34 Air supply source 37 Pressure adjustment valve 39 Control unit 41 Measurement position 43 Liquid supply port 45 Blow flow path 47, 48 Check valve 50 Connection pipe 71 Level gauge H Upper limit L Lower limit HH, LL Danger value

Claims (3)

A replenishment path having a main replenishment path connected to a server tank containing a coolant for supply, and a plurality of replenishment branch pipes branched from the main replenishment path;
The branch pipe is connected to each machining tank of a plurality of machine tools,
In a coolant replenishment system configured to supply coolant from the server tank to the machining tank in which the amount of coolant has decreased,
A stock solution tank that contains a water-soluble cutting fluid that is a stock solution of the coolant, and a water supply stock,
The server tank is a supply that adjusts the supply amount from the stock solution tank and the water supply source to adjust the coolant concentration in the server tank to a target concentration required by a specific machining tank among the plurality of machining tanks. Concentration adjustment means,
The replenishment path includes a flow path control unit that opens only a branch pipe connected to the specific machining tank from a main supply path and closes a branch pipe connected to other than the specific machining tank,
A coolant replenishment system configured to be able to supply the coolant adjusted to the target concentration in the previous period only to the specific machining tank. The server tank includes a supply server tank connected to the main supply path, and a preparation server tank connected to the upstream side of the supply server tank,
The supply server tank includes a densitometer that detects the concentration of the cutting fluid in the coolant in the tank,
The preparation server tank adjusts the supply amount from the stock solution tank and the water supply source to adjust the coolant concentration in the preparation server tank to a preparation concentration lower than the coolant concentration of the supply server tank. Preparation density adjusting means to
A coolant having a preparation concentration is supplied from the preparation server tank to the supply server tank, and the cutting fluid is supplied from the stock solution tank to the supply server tank, and the concentration of the cutting fluid in the coolant in the supply server tank is When the concentration meter detects that the target concentration has been increased, the supply of the cutting fluid from the stock solution tank is stopped, thereby reducing the concentration of the cutting fluid in the coolant in the supply tank to a predetermined target concentration. 2. The coolant replenishment according to claim 1, wherein the coolant is adjusted within a range and automatically supplied to the target machining tank from the supply server tank with the coolant adjusted within the range of the target concentration. system. The main supply path is configured such that the downstream end thereof is connected to the preparation server tank, and the coolant in the supply path after being supplied to the specific machining tank is returned to the preparation server tank. The coolant replenishment system according to claim 2.

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