JP7567099B2 - Hybrid cutting fluid automatic supply device - Google Patents

Description

The present invention relates to a hybrid cutting fluid automatic supply device that generates cutting fluid for use in cutting machines using alkaline ionized water and maintains the pH value of the cutting fluid at a predetermined set value.

Cutting fluids used in cutting machines can be broadly divided into water-soluble and water-insoluble cutting fluids. Water-soluble cutting fluids are excellent for their high cooling performance, but because they use water as their main component, they have the problem of being prone to the generation and proliferation of germs and bacteria. If germs and bacteria are generated and proliferated in the cutting fluid, problems can arise in that the cutting fluid will spoil and emit a foul odor, as well as the cutting performance of the cutting blades being reduced, shortening the lifespan of the cutting blades.

As described in the following Patent Document 1, it is said that using alkaline ionized water instead of water is an effective method for suppressing the generation and proliferation of germs and bacteria in cutting fluid.

Patent Publication 2010-132714

However, when the cutting fluid used in a cutting machine is generated using alkaline ionized water, the cutting fluid is consumed over the course of cutting processing time, and the pH value drops. In such cases, it is necessary to supply cutting fluid with a specified pH value to the cutting machine, but manually setting cutting fluid to a specified pH value is time-consuming and complicated. Furthermore, when the pH value of the cutting fluid drops, the reduced pH value needs to be returned to the set value, and returning the pH value of the cutting fluid to the specified pH value is time-consuming and not easy.

The present invention has been made to solve these problems, and its purpose is to provide a hybrid automatic cutting fluid supply device that can automatically generate cutting fluid of a predetermined pH value when the cutting fluid level decreases, and can automatically return the pH value to a set value when the pH value of the cutting fluid decreases during use, when a cutting fluid with a predetermined pH value using alkaline ionized water is used as the cutting fluid for use in a cutting machine.

The hybrid automatic cutting fluid supply device according to the present invention includes an alkaline ionized water generator that is supplied with tap water and generates alkaline ionized water from the supplied tap water, an alkaline ionized water tank in which the generated alkaline ionized water is stored, an oil tank in which additive oil is stored, a supply tank to which tap water, the alkaline ionized water in the alkaline ionized water tank, and the additive oil in the oil tank are supplied and in which supply cutting fluid is generated and stored, a supply pump that pumps out the cutting fluid in the supply tank, a cutting machine side tank that stores the cutting fluid sent out from the supply tank and supplies the stored cutting fluid to a cutting machine, a pH value sensor that measures the pH value of the cutting fluid in the cutting machine side tank, an automatic tap water valve that opens to introduce tap water into the supply tank, an alkaline ionized water pump that is driven to introduce the alkaline ionized water in the alkaline ionized water tank into the supply tank, and an oil pump that is driven to introduce the additive oil in the oil tank into the supply tank.
Then, when the cutting fluid level in the supply tank drops to a predetermined value , the automatic tap water valve is opened to supply a set amount of tap water into the supply tank, the alkaline ionized water pump is driven to supply a set amount of alkaline ionized water into the supply tank, and the oil pump is driven to supply a set amount of additive oil into the supply tank, thereby generating cutting fluid with a preset pH value in the supply tank.
In addition, when the pH value of the cutting fluid in the tank on the cutting machine side falls below a predetermined value, the alkaline ionized water pump is driven to supply a certain amount of alkaline ionized water into the supply tank, thereby raising the pH value of the cutting fluid in the supply tank, and the supply pump is driven to send the cutting fluid with a raised pH value to the tank on the cutting machine side.

In addition, in the above-mentioned hybrid automatic cutting fluid supply device, the supply tank must be provided with a means for stirring the cutting fluid in the supply tank.

The hybrid automatic cutting fluid supply device further includes a cutting machine tank level sensor that detects when the amount of cutting fluid in the cutting machine tank has decreased to a predetermined value, a pressure sensor that detects the pressure in the supply pipe connecting the supply tank and the cutting machine tank, an automatic supply pipe valve that opens and closes the supply pipe, and an automatic cutting machine tank valve that is provided at the end of the supply pipe and opens based on the detection result of the cutting machine tank level sensor.The device also includes a means for automatically driving the supply pump by detecting a pressure drop detected by the pressure sensor when the automatic cutting machine tank valve opens.

In the hybrid cutting fluid automatic supply device according to the present invention, when the cutting fluid in the supply tank decreases to a set amount, the tap water automatic valve is opened to supply tap water to the supply tank by a set amount via a flow switch, and the alkaline ionized water pump is driven to supply alkaline ionized water to the supply tank by a set amount via a flow switch. Then, the oil pump is driven to supply additive oil to the supply tank by a set amount via a flow switch, and cutting fluid with a preset PH value is generated in the supply tank. The generated cutting fluid is supplied to the cutting machine tank and supplied to the cutting machine by the cutting fluid machine supply pump. Therefore, the supply of cutting fluid using alkaline ionized water can be performed automatically and reliably without relying on human labor. In addition, when the PH value of the cutting fluid in the cutting machine tank falls below a predetermined value, the alkaline ionized water pump is driven to supply a certain amount of alkaline ionized water to the supply tank, thereby raising the PH value of the cutting fluid in the supply tank, and the supply pump is driven to send the cutting fluid with a high PH value to the cutting machine tank, thereby raising the PH value of the cutting fluid in the cutting machine tank. This operation is performed automatically until the upper limit set value of the tank pH sensor on the cutting machine side is reached. In this way, even if the pH value of the cutting fluid drops over time during cutting, the pH value of the cutting fluid used by the cutting machine can always be maintained at a specified value.

In addition, the supply tank is equipped with a means for stirring the cutting fluid in the supply tank, so the pH value of the cutting fluid in the supply tank can be adjusted uniformly.

In addition, when the amount of cutting fluid in the cutting machine tank decreases to a predetermined value, the automatic cutting machine tank valve installed in the cutting machine tank opens based on the detection result of the cutting machine tank liquid level sensor that detects the decrease in cutting fluid, and when this valve opens, the pressure sensor detects a decrease in pressure, which opens the automatic supply piping valve and drives the supply pump, so that when the cutting fluid in the cutting machine tank decreases, cutting fluid can be replenished into the cutting machine tank without electrical interlock.

FIG. 2 is a block diagram showing an automatic cutting fluid supply device. 10 is a flowchart showing a process for producing cutting fluid with a predetermined pH value when the cutting fluid has decreased. 10 is a flowchart showing a process for returning the reduced pH value of the cutting fluid in the cutting machine tank to a predetermined value when the pH value of the cutting fluid has decreased.

One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a hybrid automatic cutting fluid supply device that supplies cutting fluid to a cutting machine 1. This cutting machine 1 uses cutting fluid with a predetermined pH value of 10.0 to 11.0, and the automatic cutting fluid supply device uses alkaline ionized water to generate cutting fluid with the predetermined pH value and supplies the generated cutting fluid to the cutting machine 1.

The hybrid cutting fluid automatic supply device has an alkaline ionized water generator 2, an alkaline ionized water tank 3, an oil tank 4, a supply tank 5, and a cutting machine side tank 6.

The alkaline ionized water generator 2 is connected to a tap water faucet 7 via tap water piping 7a. A manual valve 8 is provided in the tap water piping 7a, and tap water flows into the alkaline ionized water generator 2 through the tap water piping 7a by opening the manual valve 8. The alkaline ionized water generator 2 is provided with a device (not shown) that generates alkaline ionized water by electrolyzing tap water.

The alkaline ionized water tank 3 is connected to the alkaline ionized water generator 2 via a pipe 9. The alkaline ionized water tank 3 stores the alkaline ionized water generated by the alkaline ionized water generator 2. The alkaline ionized water tank 3 is provided with an upper limit alarm sensor 10, a lower limit alarm sensor 11, and a lower limit forecast sensor 12 as sensors for measuring the amount of alkaline ionized water stored in the alkaline ionized water tank 3. When the amount of alkaline ionized water in the alkaline ionized water tank 3 decreases to the position of the lower limit forecast sensor 12, a warning light (not shown) is turned on and an instruction is given to an operator to operate the alkaline ionized water generator 2 to generate alkaline ionized water. When the amount of alkaline ionized water in the alkaline ionized water tank 3 is detected by the upper limit alarm sensor 10 or the lower limit alarm sensor 11, an alarm is issued to indicate that the amount of alkaline ionized water is abnormal.

The alkaline ionized water tank 3 and the supply tank 5 are connected by a pipe 13. An alkaline ionized water pump 14 and an alkaline ionized water cumulative flow sensor 15 are provided in the middle of the pipe 13. When driven, the alkaline ionized water pump 14 supplies the alkaline ionized water in the alkaline ionized water tank 3 to the supply tank 5. The alkaline ionized water cumulative flow sensor 15 accumulates the amount of alkaline ionized water supplied to the supply tank 5.

Additive oil, which is one of the components of cutting fluid, is stored in the oil tank 4. The oil tank 4 and the supply tank 5 are connected by a pipe 16. An oil pump 17 and an oil cumulative flow sensor 18 are provided in the middle of the pipe 16. The oil pump 17 supplies the additive oil in the oil tank 4 to the supply tank 5 when driven. The oil cumulative flow sensor 18 accumulates the amount of additive oil supplied to the supply tank 5. In addition, a lower limit alarm sensor 19 is provided in the oil tank 4 to detect when the amount of additive oil in the oil tank 4 has decreased to a predetermined value. When the amount of additive oil in the oil tank 4 has decreased to a position detected by the lower limit alarm sensor 19, a warning light (not shown) is turned on and an instruction is given to the operator to replenish the additive oil in the oil tank 4.

The supply tank 5 is where cutting fluid is produced using alkaline ionized water, and the inlet piping to this supply tank 5 is made up of a pipe 13 through which alkaline ionized water is supplied, a pipe 16 through which additive oil is supplied, and a tap water pipe 7b which is connected to a tap water faucet 7 and through which tap water is supplied. The cutting fluid is produced by mixing the alkaline ionized water, additive oil, and tap water in the supply tank 5. The pH value of the produced cutting fluid is set to a set value (10.0 to 11.0) by adjusting the ratio of tap water to alkaline ionized water.

An automatic tap water valve 20 that switches the supply of tap water on and off and a tap water integrated flow sensor 21 are provided in the tap water piping 7b. When the automatic tap water valve 20 is opened, tap water is supplied to the supply tank 5, and when it is closed, the supply is stopped. The tap water integrated flow sensor 21 integrates the amount of tap water supplied to the supply tank 5, and the automatic tap water valve 20 is opened and closed by the signal output from this tap water integrated flow sensor 21.

In the supply tank 5, an upper limit alarm sensor 22, a lower limit alarm sensor 23, and a lower limit forecast sensor 24 are provided as sensors for measuring the amount of cutting fluid stored in the supply tank 5. When the amount of cutting fluid in the supply tank 5 decreases to the position of the lower limit forecast sensor 24, tap water, alkaline ionized water, and additive oil are supplied, and production of cutting fluid begins. When the amount of cutting fluid in the supply tank 5 is detected by the upper limit alarm sensor 22 or the lower limit alarm sensor 23, an alarm is issued indicating that the amount of cutting fluid is abnormal.

Supply pipes 25a and 25b are connected between the bottom of the supply tank 5 and the cutting machine tank 6. A supply pump 26, an automatic supply pipe valve 27, a pressure sensor 28, and an automatic cutting machine tank valve 29 are provided in the middle of these supply pipes 25a and 25b. The supply pump 26 supplies cutting fluid in the supply tank 5 to the cutting machine tank 6 when driven. The pressure sensor 28 detects the pressure in the supply pipe 25b. The automatic supply pipe valve 27 opens and closes according to the detection result of the pressure sensor 28, closing when the pressure sensor 28 detects the upper limit, and opening when the detection value of the pressure sensor 28 falls to the lower limit.

One end of the agitation pipe 30 is connected to the portion of the supply pipe 25a between the supply pump 26 and the automatic supply pipe valve 27. The other end of the agitation pipe 30 is connected to the middle part of the supply tank 5. An automatic agitation valve 31 is provided midway along the agitation pipe 30.

The cutting machine tank 6 is provided with a cutting machine tank level sensor 32 and at least one cutting machine tank pH value sensor 33, and each cutting machine tank 6 is provided with a cutting fluid machine supply pump 34 and a chip processing unit 35. The cutting machine tank level sensor 32 detects the cutting fluid level in the cutting machine tank 6, and opens the cutting machine tank automatic valve 29 when the water level falls below a set value. The cutting machine tank pH value sensor 33 measures the pH value of the cutting fluid in the cutting machine tank 6, and outputs a detection signal when the measured pH value falls below a set value. The cutting fluid machine supply pump 34 discharges and supplies the cutting fluid in the cutting machine tank 6 toward the cutting part of the cutting machine 1. The chip processing unit 35 is where the cutting fluid used in the cutting machine 1 is returned to the cutting machine tank 6, and the chips contained in the returned cutting fluid are removed.

When multiple cutting machines 1 and cutting machine tanks 6 are installed side by side, it is desirable to group several to about ten cutting machine tanks 6 into one block and connect them with a communicating pipe 36. This keeps the cutting fluid level in each cutting machine tank 6 constant.

This hybrid cutting fluid automatic supply device is provided with a means for generating cutting fluid with a predetermined pH value when the cutting fluid in the supply tank 5 decreases, and a means for restoring the pH value of the cutting fluid to a predetermined value when the pH value of the cutting fluid in the cutting machine tank 6 decreases. These means are composed of a control unit (not shown) equipped with a CPU, ROM, and RAM, and sensors, automatic valves, pumps, etc. connected to the control unit. For example, the means for generating cutting fluid with a predetermined pH value when the cutting fluid in the supply tank 5 decreases is composed of the control unit, the lower limit forecast sensor 24 in the supply tank 5, the automatic tap water valve 20, the tap water cumulative flow sensor 21, the alkaline ionized water pump 14, the alkaline ionized water cumulative flow sensor 15, the oil pump 17, the oil cumulative flow sensor 18, the supply pump 26, the automatic stirring valve 31, etc. In addition, the means for returning the cutting fluid pH value in the cutting machine tank 6 to a predetermined set value when the pH value of the cutting fluid drops is composed of the control unit, cutting machine tank pH value sensor 33, alkaline ionized water pump 14, alkaline ionized water integrated flow sensor 15, supply pump 26, automatic stirring valve 31, cutting machine tank liquid level sensor 32, cutting machine tank automatic valve 29, supply piping automatic valve 27, pressure sensor 28, etc.

In this configuration, in a cutting machine 1 equipped with this hybrid automatic cutting fluid supply device, cutting work is started with cutting fluid at the set pH value stored in the supply tank 5 and the cutting machine tank 6.

When the cutting machine 1 is operating, the cutting fluid in the cutting machine tank 6 is supplied to the cutting blade of the cutting machine 1. The supplied cutting fluid splashes or adheres to the processing part, and the cutting fluid in the cutting machine tank 6 gradually decreases. Then, when the cutting fluid level in the cutting machine tank 6 falls below a set value, the cutting machine tank fluid level sensor 32 detects that the cutting fluid level has fallen below the set value.

When the cutting machine side tank fluid level sensor 32 detects that the cutting fluid level in the cutting machine side tank 6 has dropped below a set value, the cutting machine side tank automatic valve 29 is opened based on the detection result. When the cutting machine side tank automatic valve 29 is opened, the pressure in the supply pipe 25b drops, and this drop in pressure is detected by the pressure sensor 28. When the pressure sensor 28 detects the drop in pressure, the supply pipe automatic valve 27 is opened, and then the supply pump 26 is driven. As a result, the cutting fluid in the supply tank 5 is supplied into the cutting machine side tank 6 through the supply pipe 25b.

When the cutting fluid level in the cutting machine tank 6 rises to a set value, the cutting machine tank fluid level sensor 32 detects that the cutting fluid level has risen to the set value. Based on this detection result, the cutting machine tank automatic valve 29 is closed, which causes the pressure in the supply pipe 25b to increase, and this increase in pressure is detected by the pressure sensor 28. Based on this detection result, the supply pipe automatic valve 27 is closed and the supply pump 26 is stopped, stopping the supply of cutting fluid from the supply tank 5 to the cutting machine tank 6. In this manner, the supply of cutting fluid from the supply tank 5 to the cutting machine tank 6 is repeated.

Next, when the cutting fluid level in the supply tank 5 drops to the set value, a means for generating cutting fluid with the set pH value in the supply tank 5 is executed. This cutting fluid generating means will be explained based on FIG. 2. This cutting fluid generating means is first started when a detection signal from the lower limit forecast sensor 24 in the supply tank 5 is input to the control unit (step S1).

When a detection signal from the lower limit forecast sensor 24 is input to the control unit (YES in step S1), a predetermined amount of tap water is supplied to the supply tank 5 (step S2), a predetermined amount of alkaline ionized water is supplied to the supply tank 5 (step S3), a predetermined amount of additive oil is supplied to the supply tank 5 (step S4), and stirring is performed (step S5). Note that steps S2 and S3 are started at approximately the same time. Step 4 starts after step 3 is completed.

Regarding the supply of a predetermined amount of tap water in step S2, first, the automatic tap water valve 20 is opened to start the supply of tap water into the supply tank 5. The amount of tap water supplied is accumulated by the tap water cumulative flow sensor 21, and when the accumulated amount reaches a predetermined value, the automatic tap water valve 20 is closed and the supply of tap water is stopped.

Regarding the supply of a predetermined amount of alkaline ionized water in step S3, first, the alkaline ionized water pump 14 is driven to start the supply of alkaline ionized water from the alkaline ionized water tank 3 to the supply tank 5. The amount of alkaline ionized water supplied is integrated by the alkaline ionized water integrated flow sensor 15, and when the integrated value reaches a predetermined value, the operation of the alkaline ionized water pump 14 is stopped, and the supply of alkaline ionized water is stopped.

Regarding the supply of a predetermined amount of added oil in step 4, first, the oil pump 17 is driven to start the supply of added oil from the oil tank 4 to the supply tank 5. The amount of added oil supplied is integrated by the oil integrated flow sensor 18, and when the integrated value reaches a predetermined value, the operation of the oil pump 17 is stopped and the supply of added oil is stopped.

In the mixing step S5, the automatic mixing valve 31 is opened and the supply pump 26 is driven. This causes the cutting fluid in the supply tank 5 to be sucked out by the supply pump 26, and the sucked out cutting fluid is circulated through the mixing piping 30 into the supply tank 5. The operation of the supply pump 26 ends when a preset mixing time has elapsed. After the mixing time has elapsed, the automatic supply piping valve 27 is opened and the supply of the cutting fluid sucked out by the supply pump 26 to the tank 6 on the cutting machine side is started.

By performing steps S2 to S4 above, cutting fluid with a set pH value is automatically generated in the supply tank 5 from a predetermined amount of tap water, a predetermined amount of alkaline ionized water, and a predetermined amount of additive oil. At this time, by performing stirring in step S5, the pH value of the cutting fluid generated in the supply tank 5 is made uniform without any partial bias.

Next, if the pH value of the cutting fluid in the cutting machine tank 6 falls below the set value, a means is implemented to return the pH value of the cutting fluid in the cutting machine tank 6 to the set value. The means for returning the reduced pH value of the cutting fluid to the set value will be described with reference to FIG. 3. This means is started when the cutting machine tank pH value sensor 33 detects that the pH value from the cutting machine tank 6 in the cutting machine tank 6 has fallen below the predetermined set value, and the detection signal is input to the control unit (step S11).

When a signal from the cutting machine tank pH sensor 33 that the pH has fallen below the set value is input to the control unit (YES in step S11), cutting fluid with a high pH is produced in the supply tank 5 (step S12), and the produced cutting fluid with a high pH is supplied to the cutting machine tank 6 (step S13), causing the pH of the cutting fluid in the cutting machine tank 6 to rise. This operation is repeated until the cutting machine tank pH sensor 33 detects the upper limit.

When generating cutting fluid with a high pH value in step S12, first, the alkaline ionized water pump 14 is driven and a certain amount of alkaline ionized water is supplied to the supply tank 5, thereby increasing the pH value of the cutting fluid in the supply tank 5. At this time, the automatic stirring valve 31 is opened and the supply pump 26 is driven, and the cutting fluid in the supply tank 5 is circulated through the stirring piping 30, thereby stirring the cutting fluid in the supply tank 5.

The process of supplying the cutting fluid with a high pH value to the cutting machine tank 6 in step S13 is started when the cutting machine tank level sensor 32 detects that the cutting fluid level (cutting fluid with a low pH value) in the cutting machine tank 6 has fallen below a predetermined value. When the cutting machine tank level sensor 32 detects that the cutting fluid level in the cutting machine tank 6 has fallen below a predetermined value, the automatic cutting machine tank valve opens, which reduces the pressure in the supply pipe 25b, and the pressure sensor detects the lower limit, so that the same process as when supplying cutting fluid from the supply tank 5 to the cutting machine tank 6 described above is performed. Specifically, the automatic cutting machine tank valve 29 opens, the pressure sensor 28 detects a pressure drop in the supply pipe 25, the automatic supply pipe valve 27 opens, and the supply pump 26 is driven. As a result, the cutting fluid with a high pH value in the supply tank 5 is supplied to the cutting machine tank 6 through the supply pipe 25, and the pH value of the cutting fluid in the cutting machine tank 6 increases. Then, when the cutting machine tank PH sensor 33 detects that the PH value of the cutting fluid in the cutting machine tank 6 has risen to a predetermined value, the supply of cutting fluid with a high PH value to the cutting machine tank 6 is stopped. After the supply of cutting fluid with a high PH value to the cutting machine tank 6 is stopped, a predetermined amount of tap water is supplied to the supply tank 5, and the PH value of the cutting fluid in the supply tank 5 is returned to the original predetermined PH value.

REFERENCE SIGNS LIST 1 Cutting machine 2 Alkaline ionized water generator 3 Alkaline ionized water tank 4 Oil tank 5 Supply tank 6 Cutting machine side tank 7a Tap water pipe 7b Tap water pipe 8 Manual valve 9 Pipe 10 Upper limit alarm sensor 11 Lower limit alarm sensor 12 Lower limit forecast sensor 13 Pipe 14 Alkaline ionized water pump 15 Alkaline ionized water integrated flow sensor 16 Pipe 17 Oil pump 18 Oil integrated flow sensor 19 Lower limit alarm sensor
20 Automatic tap water valve 21 Tap water integrated flow sensor 22 Upper limit warning sensor 23 Lower limit warning sensor 24 Lower limit forecast sensor 25a Supply pipe 25b Supply pipe 26 Supply pump 27 Automatic supply pipe valve 28 Pressure sensor 29 Cutting machine side tank automatic valve 30 Mixing pipe 31 Automatic mixing valve 32 Cutting machine side tank liquid level sensor 33 Cutting machine side tank pH value sensor 34 Cutting fluid machine supply pump 35 Chip treatment unit 36 Communication pipe

Claims (2)

An alkaline ionized water generator that receives tap water and generates alkaline ionized water from the tap water;
an alkaline ionized water tank for storing the generated alkaline ionized water;
an oil tank in which the additive oil is stored;
a supply tank to which tap water, the alkaline ionized water in the alkaline ionized water tank, and the additive oil in the oil tank are supplied, and in which a supply cutting fluid is generated and stored;
A supply pump that pumps out the cutting fluid in the supply tank;
a cutting machine tank to which the cutting fluid discharged from the supply tank is supplied and to which the cutting fluid is supplied to the cutting machine;
a cutting machine tank pH value sensor for measuring a pH value of the cutting fluid in the cutting machine tank;
an automatic tap water valve that opens to introduce tap water into the supply tank;
an alkaline ionized water pump that is driven to introduce the alkaline ionized water in the alkaline ionized water tank into the refill tank;
an oil pump that is driven to introduce the added oil from the oil tank into the supply tank,
When the cutting fluid level in the supply tank falls to a set value, the automatic tap water valve is opened to supply a set amount of tap water into the supply tank, the alkaline ionized water pump is driven to supply a set amount of alkaline ionized water into the supply tank, and the oil pump is driven to supply a set amount of additive oil into the supply tank, thereby generating cutting fluid with a preset pH value in the supply tank,
A hybrid automatic cutting fluid supply device characterized in that, when the pH value of the cutting fluid in the tank on the cutting machine side falls below a set value, the alkaline ionized water pump is driven to supply a constant amount of alkaline ionized water into the supply tank to raise the pH value of the cutting fluid in the supply tank, and the supply pump is driven to automatically send the cutting fluid with a raised pH value to the tank on the cutting machine side, and the supply tank is provided with a means for stirring the cutting fluid in the supply tank. The hybrid automatic cutting fluid supply device according to claim 1, further comprising a cutting machine tank level sensor that detects when the level of the cutting fluid in the cutting machine tank has dropped to a set value, a pressure sensor that detects the pressure in the supply pipe connecting the supply tank and the cutting machine tank, an automatic supply pipe valve that opens and closes the supply pipe, and an automatic cutting machine tank valve that is provided at the end of the supply pipe and opens based on the detection result of the cutting machine tank level sensor, and the pressure sensor detects a pressure drop when the automatic cutting machine tank valve opens, thereby opening the automatic supply pipe valve and driving the supply pump.

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