JP2001150293A - Liquid feeding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid feeding apparatus capable of feeding a liquid of high pressure to a jet nozzle and permitting liquid replenishment during use. SOLUTION: The liquid feeding apparatus includes a LUB tank 19 for retaining lubricating oil 20, a LUB following cylinder 14, and a LUB sub-cylinder 15. The LUB following cylinder 14 is designed to be convertible between a sucking state in which it sucks the lubricating oil 20 in the LUB tank 19 by use of negative pressure created within the LUB following cylinder 14 and a discharging state in which it discharges the lubricating oil 20 sucked. The LUB sub-cylinder 15 is designed to be convertible between a state in which it allows the liquid discharged under the discharging state to flow therein and causes part of the liquid to flow out while retaining the other part of the liquid therein, and an outflow state in which it causes the lubricating oil 20 collected during the sucking state to flow out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid supply device for supplying various liquids such as cutting oil, lubricating oil and cooling water to an injection nozzle in various machine tools such as a machining center, an NC lathe and a grinding machine. is there.

[0002]

2. Description of the Related Art Conventionally, when a workpiece is cut or polished or the like, the heat generated by the collision between the workpiece and the processing tool is cooled or the processing section is lubricated. A water-soluble cutting fluid or the like is supplied toward the apparatus. In this case, if a large capacity pump is used, power consumption increases and it is uneconomical.
Devices using high-pressure air are often used. For example, Japanese Patent Laying-Open No. 7-290343 proposes a cutting fluid supply device as shown in FIG. This cutting fluid supply device includes a cutting fluid 1 on a tool rest (not shown) of a machine tool.
A closed chamber 101 for storing a cutting fluid is provided. In the closed chamber 101, a cutting fluid inlet 102 connected to a cutting fluid pump (not shown), a cutting fluid outlet 103 connected to a nozzle (not shown), An air inlet 104 connected to an air compressor (not shown) is provided, and the cutting fluid 100 in the closed chamber 101 is pressurized by high-pressure air 105 sent from the air compressor so as to be ejected from a nozzle.

However, such a cutting fluid supply device is
When used in a large vertical machine tool such as a machining center, cutting fluid tends to accumulate in the vicinity of a processing portion or the like, and on the contrary, processing performance may deteriorate. For this reason,
Recently, instead of applying the cutting fluid as it is, it has been also performed to supply it after spraying it in a mist state. According to this method, the inconvenience that the cutting fluid accumulates in the vicinity of the processed portion as in the case of liquid application is eliminated.

Therefore, as an apparatus for injecting a cutting fluid or the like in a mist state, an apparatus disclosed in Japanese Patent Application Laid-Open No. 9-248735 has been proposed. This device is a device for spraying water-soluble cutting fluid in the form of a mist into brass. As shown in FIG. 19, an air compressor 111, a pressure feeding tank 112, a solenoid valve 113, an automatic spray gun 11
4 etc. are provided. When this apparatus is used, after a water-soluble cutting oil is stored in the pressure feed tank 112, a start button (not shown) is pressed. As a result, the inside of the pressure feeding tank 112 is pressurized by the air supplied from the air compressor 111, and this pressurization causes the pressure feeding tank 11
The water-soluble cutting oil in 2 is sent to the automatic spray gun 114. On the other hand, when the start button is pressed, the solenoid valve 113 is pressed.
Is opened, air is sent from the air compressor 111 to the inside of the automatic spray gun 114, and the air pressure moves the piston (not shown) inside the automatic spray gun 114, so that the water-soluble cutting oil is atomized and sprayed on the brass. Can be

[0005]

However, in the above-described apparatus, the automatic spray gun 11 is moved from the pressure feed tank 112.
Because the pressure of the water-soluble cutting oil supplied to 4 is low,
When the water-soluble cutting oil flows into the air inside the automatic spray gun 114, the air pressure drops. Moreover, since the inside of the pressure feed tank 112 must be pressurized during use, it is necessary to stop the apparatus when replenishing the water-soluble cutting oil.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid supply device that can supply a high-pressure liquid to an ejection nozzle and can replenish the liquid at the time of use. .

[0007]

In order to achieve the above object, a liquid supply apparatus according to the present invention comprises a tank for containing a liquid and a first suction port having its own suction port communicating with the tank.
A second cylinder having its own inlet communicating with the outlet of the first cylinder and its own outlet communicating with the injection nozzle of the machine tool, and having the cylinder rod of the first cylinder on one side. By moving to the first
A suction state in which the liquid in the tank is sucked into the cylinder chamber from the suction port by using a negative pressure generated in the cylinder chamber of the cylinder, and the liquid in the cylinder chamber is discharged to the discharge port by moving the cylinder rod to the other side. The liquid discharged from the discharge port in the discharge state is allowed to flow in from the inflow port, a part of the liquid is discharged from the outflow port in the discharge state, and the other portion is in the second cylinder. By moving the cylinder rod of the second cylinder to one side in the sucking state and the state in which
The liquid in the cylinder chamber of the cylinder is configured to be switchable to an outflow state in which the liquid flows out of the outflow port.

[0008] That is, the liquid supply device of the present invention comprises:
When the first cylinder is in the suction state using the second cylinder and the second cylinder (that is, when the liquid in the tank is sucked into the cylinder chamber by using the negative pressure generated in the cylinder chamber), the second cylinder is When the first cylinder is in the discharge state (ie, the liquid in the cylinder chamber is flowing out of the cylinder chamber) and is in the discharge state (ie,
(When the liquid in the cylinder chamber of the first cylinder is discharged and allowed to flow into the cylinder chamber of the second cylinder)
In the cylinder, part of the liquid that has flowed into the cylinder chamber flows out of the cylinder chamber, while the other part of the liquid is stored in the cylinder chamber. Therefore, the liquid sucked up by the first cylinder can be supplied to the injection nozzle without interruption using the second cylinder. In addition, since the cylinder is used, the liquid can be supplied to the ejection nozzle in a high pressure state. Moreover, since the liquid in the tank is sucked up by using the negative pressure generated in the cylinder chamber of the first cylinder, the liquid can be constantly supplied to the tank.

In the present invention, first backflow preventing means for preventing the liquid in the cylinder chamber of the first cylinder from flowing backward from the suction port into the tank in the above-mentioned discharge state; When a second backflow preventing means for preventing the liquid in the cylinder chamber from flowing backward from the inflow port into the cylinder chamber of the first cylinder is provided, the liquid sucked from the tank returns to the tank, The liquid flowing into the cylinder chamber of the cylinder is the first
Efficient liquid supply can be performed without returning to the cylinder chamber of the cylinder.

Further, in the present invention, a high pressure fluid supply source and a main cylinder operated by the high pressure fluid supplied from the high pressure fluid supply source are provided, and the cylinder rod of the main cylinder and the cylinder rod of the first cylinder are provided. When the cylinder rod of the second cylinder is moved to one side by the high-pressure fluid supplied from the high-pressure fluid supply source, the first and second cylinders are connected to each other by the high-pressure fluid. It can be operated by the high-pressure fluid supplied from the supply source, and in terms of power consumption,
It is economical.

Further, in the present invention, when the high-pressure fluid is supplied from the high-pressure fluid supply source to the injection nozzle, and merges with the liquid flowing into the injection nozzle from the second cylinder, the first high-pressure fluid is supplied to the first nozzle. The high pressure fluid supply source for operating the second cylinder and the high pressure fluid supply source for supplying the high pressure fluid to the injection nozzle can be shared.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the liquid supply apparatus according to the present invention. In the figure, reference numeral 1 denotes a high-pressure air generating source, from which a supply pipe 2 extends. Reference numeral 3 denotes a filter with a drain attached to the supply pipe 2. The supply pipe 2 is branched into a nozzle-side pipe 4 and a cylinder-side pipe 5 on the downstream side of the filter 3. A pressure reducing valve 6 and an electromagnetic first opening / closing valve (control valve) 7 are attached to the nozzle side pipe 4.
When the first on-off valve 7 is opened, the high-pressure air supplied from the high-pressure air generating source 1 is reduced to a predetermined pressure by the pressure reducing valve 6 and sent to the injection nozzle 23 (see FIG. 12).

A pressure reducing valve 8 is attached to the cylinder side pipe 5. The end of the cylinder-side pipe 5 communicates with an inlet port of an electromagnetic first directional control valve (control valve) 10 via a first connecting pipe 9 and an electromagnetic type via a second connecting pipe 11. The second direction switching valve (control valve) 12 communicates with the inlet port of the second direction switching valve (control valve) 12.

Reference numeral 13 denotes a double-acting LUB main cylinder.
Reference numeral 14 denotes an LUB tracking cylinder (first cylinder). These two cylinders 13 and 14 are disposed on the left and right so as to face each other (in the drawing, the LUB main cylinder 13 is disposed on the left side, and the LU follow-up cylinder 14 is disposed on the right side). Rods 13a and 14a are connected in a straight line. Therefore, the LUB main cylinder 1
When the third cylinder rod 13a moves left and right, the cylinder rod 14a of the LUB following cylinder 14 also moves left and right with this left and right movement. Reference numeral 15 denotes a single-acting LUB sub-cylinder (second cylinder),
Right chamber (cylinder chamber) 14b and LUB sub-cylinder 15
And the right chamber (cylinder chamber) 15b.

Reference numeral 16 denotes a double-acting COOL main cylinder, and reference numeral 17 denotes a COOL follow-up cylinder (first cylinder). These two cylinders 16 and 17 are disposed opposite to each other on the left and right sides (in the drawing, the COOL main cylinder 16
Are disposed on the left side, and the COOL following cylinder 17 is disposed on the right side), and the two cylinder rods 16a, 17
a are connected in a straight line. Therefore, when the cylinder rod 16a of the COOL main cylinder 16 moves left and right, the cylinder rod 17a of the COOL following cylinder 17 also moves left and right with this left and right movement. Reference numeral 18 denotes a single-acting COOL sub-cylinder (second cylinder).
The right chamber (cylinder chamber) 17b of the L following cylinder 17 and CO
A right chamber (cylinder chamber) 18b of the OL sub-cylinder 18 communicates with the right sub-cylinder 18. These cylinders 13 to 18 are arranged sideways. The inner diameters of the cylinders 13 to 18 are all set to be the same.

The first directional control valve 10 is connected to the right chamber 1 of the LUB main cylinder 13 from one outlet port via a first connection pipe 25 and a first main pipe 27.
3b, the right chamber 1 of the COOL main cylinder 16 through the first connection pipe 25 and the second main pipe 28.
6b. Further, the first directional switching valve 1
0 communicates from the other outlet port to the left chamber 13c of the LUB main cylinder 13 through the second connection pipe 26 and the third main pipe 29, and to COOL through the second connection pipe 26 and the fourth main pipe 30. It communicates with the left chamber 16c of the main cylinder 16. Each of these main pipes 27-30 has a flow control valve 27a-30 with a check valve.
a is attached.

The first directional control valve 10 has an A state in which the first connecting pipe 9 communicates with the first connecting pipe 25 and a second connecting pipe 26 communicates with the atmosphere. The state B in which the communication between the two connection pipes 25 and 26 is prevented, the first connection pipe 9 and the second connection pipe 2
6 and the first connection pipe 25 can be switched to the C state in which the first connection pipe 25 communicates with the atmosphere.

On the other hand, the second directional control valve 12 is connected to the left chamber 15 of the LUB sub-cylinder 15 from an outlet port thereof through a third connection pipe 31 and a fifth main pipe 32.
c, the third connecting pipe 31 and the sixth main pipe 3
3, and communicates with the left chamber 18c of the COOL sub-cylinder 18. The two main pipes 32, 33 are also provided with flow control valves 32a, 33a with check valves.

Such a second directional control valve 12 is provided with a D connecting the second connecting pipe 11 and the third connecting pipe 31.
The state and the E state in which the third connection pipe 31 communicates with the atmosphere can be switched.

Reference numeral 40 denotes a LUB introduction pipe provided with a backflow prevention means 41, which communicates with a suction port provided in the right chamber 14 b of the LUB following cylinder 14 in the LUB tank 19.
42 is a LUB supply pipe with a check valve 43;
The discharge port and the LUB provided in the right chamber 14b of the following cylinder 14
It communicates with an inlet provided in the right chamber 15b of the sub cylinder 15. 44 is a right chamber 15b of the LUB sub-cylinder 15
Is a LUB outflow pipe with an electromagnetic second on-off valve (control valve) 45 extending from the outlet provided in the injection nozzle 23.
Is in communication with

On the other hand, 46 is a COO with backflow prevention means 47.
This is an L introduction pipe, and a suction port provided in the right chamber 17 b of the COOL tracking cylinder 17 communicates with the inside of the COOL tank 21. Reference numeral 48 denotes a COOL supply pipe with a check valve 49, which communicates a discharge port provided in the right chamber 17b of the COOL tracking cylinder 17 with an inflow port provided in the right chamber 18b of the COOL sub-cylinder 18. Reference numeral 50 denotes a COOL outlet pipe with an electromagnetic third on-off valve (control valve) 51 extending from an outlet provided in the right chamber 18 b of the COOL sub-cylinder 18, and communicates with the injection nozzle 23.

The backflow preventing means 41 and 47 are used in a vertically oriented state. As shown in FIG. 2, a pipe joint 35 having a vertically formed flow path therein, And a valve element 36 disposed in the flow path 35. That is, as shown in FIG. 3, the pipe joint 35 has upper and lower threaded portions 35a and 35b formed on its outer peripheral surface and a central nut portion 35c. On the inner peripheral surface of the pipe joint 35, a lower small-diameter flow path 37a, an inverted truncated cone-shaped tapered surface 37b expanding in an upwardly expanding shape, and an upper large-diameter flow path 37c are formed. The valve body 36 is mounted on the tapered surface 37b. The valve body 36 includes a lower cylindrical portion 36a,
Upper disc portion 36b in which a concave groove 38 is formed in the upper surface in a longitudinal shape
(See FIG. 4), and an O-ring 39 is externally fitted to the upper end of the lower cylindrical portion 36a. As shown in FIG. 5, the upper surface of the upper disc portion 36 b of the valve body 36 abuts against the lower end surface of the LUB introduction pipe 40 or the COOL introduction pipe 46 when sucking lubricating oil or cooling water described later. In such a case, a flow path for the lubricating oil or the cooling water is ensured, and both are prevented from being in close contact with each other.

In the above configuration, 1
A cycle takes place. That is, it is assumed that one cycle starts from the state shown in FIG. In this state,
The third on-off valves 7, 45, 51 are open. Also, the first
The directional control valve 10 is in the C state, and the second directional control valve 1
2 is set to the E state. The cylinder rods 13a, 16a, 14a, 17a of the main cylinders 13, 16 and the follower cylinders 14, 17 are located at the left end positions, and the cylinder rods 15 of the sub cylinders 15, 18 are located at the left end.
a, 18a extend to the right. The right chamber 14b of the LU following cylinder 14 and the LU sub cylinder 15
Is supplied to the right chamber 15b of the COOL following cylinder 17 and the right chamber 18b of the COOL sub-cylinder 18.
b is filled with cooling water. The internal pressure of the left chambers 15c, 18c of the two sub-cylinders 15, 18 is the same as the internal pressure of the left chambers 13c, 16c of the two main cylinders 13, 16.

In this state, a part of the high-pressure air supplied from the high-pressure air source 1 is sent to the injection nozzle 23 after being reduced to a predetermined pressure by the pressure reducing valve 6. The other part of the high-pressure air is reduced to a predetermined pressure by the pressure reducing valve 8, and then flows into the left chambers 13c and 16c of the main cylinders 13 and 16 to move the cylinder rods 13a and 16a to the right. Along with this, the cylinder rods 14a, 17a of the following cylinders 14, 17 move rightward, and the lubricating oil or cooling water in the right chambers 14b, 17b of the following cylinders 14, 17 is discharged. 18 right ventricle 15
b, 18b.

At this time, the air flow rate of the air discharged from the right chambers 13b, 16b of each of the main cylinders 13, 16 is adjusted by flow control valves 27a, 28a attached to the first and second main pipes 27, 28. Has been
The discharge speed of the lubricating oil or cooling water discharged from the right chambers 14b, 17b of each of the following cylinders 14, 17 is controlled, and the flow rate thereof is kept constant. Also,
Since the backflow prevention means 41 and 47 are provided in each of the introduction pipes 40 and 46, the right chamber 1 of each of the following cylinders 14 and 17 is provided.
The lubricating oil or cooling water discharged from 4b, 17b does not return to each tank 19, 21.

In each of the sub-cylinders 15, 18, the right chamber 15
lubrication oil or cooling water flowing into the right chamber 1
5b, 18b, and gradually pushes the cylinder rods 15a, 18a to the left side, and the right chamber 15b
b, 18b.

At this time, the air flow rate of the air discharged from the left chambers 15c, 18c of the sub-cylinders 15, 18 is adjusted by the flow control valves 32a, 33a attached to the fifth and sixth main pipes 32, 33. Has been
The flow rate of lubricating oil or cooling water flowing out of each of the right chambers 15b and 18b and the amount of lubricating oil or cooling water stored in each of the right chambers 15b and 18b are controlled. Further, since the supply pipes 42 and 48 are provided with the check valves 43 and 49, the lubricating oil or the cooling water flowing out of the right chambers 15b and 18b flows to the right chambers 14b and 17b of the following cylinders 14 and 17 respectively. Will not return.

In this manner, each of the main cylinders 13,
When the sixteen cylinder rods 13a and 16a reach the right end position (the state immediately before the arrival is shown in FIG. 7), the second direction switching valve 12 is switched to the D state. The first directional control valve 10 remains in the C state (see FIG. 8). In this state, since the cylinder rods 13a and 16a are at the right end position, the lubricating oil or the cooling water cannot be discharged by the cylinder rods 13a and 16a. Cylinder 1
The cylinder rods 15a, 18a are moved to the right by flowing into the left chambers 15c, 18c of 5, 18
Lubricating oil or cooling water flows out of the right chambers 15b and 18b.

Further, each of the cylinder rods 13a, 16a is at the right end position (that is, each of the cylinder rods 13a, 16a,
16a is delayed to the left), the high-pressure air is supplied to the left chamber 13c of each of the main cylinders 13 and 16,
16c, the left chamber 1 of each sub-cylinder 15, 18
5c, 18c, and the internal pressure of each left chamber 15c, 18c rises. Then, in the state immediately before the arrival, the internal pressure of each of the left chambers 15c and 18c whose internal pressure has slightly decreased returns to the original pressure. This state is continued for 5 seconds.

After the time lag of 5 seconds,
As shown in FIG. 9, the first direction switching valve 10 is switched to the A state. In this state, each main cylinder 13, 1
The high-pressure air from the high-pressure air generating source 1 flows into the right chambers 13b and 16b of 6 and the cylinder rods 13a and 16a move to the left. Accordingly, each following cylinder 14, 1
The cylinder rods 14a, 17a also move to the left, and the negative pressure generated in the right chambers 14b, 17b of the following cylinders 14, 17 causes the lubricating oil 20 of the LUB tank 19 or the COOL tank to be stored in the right chambers 14b, 17b. Cooling water 22 in 21 is sucked up.

At this time, the air flow rate of the air discharged from the left chambers 13c, 16c of the main cylinders 13, 16 is adjusted by flow control valves 29a, 30a attached to the third and fourth main pipes 29, 30. Has been
The cylinder rods 13a of the main cylinders 13, 16
The moving speed of 16a is controlled, and the amount of lubricating oil or cooling water sucked is kept constant. On the other hand, the second directional control valve 12 remains in the D state, sends high-pressure air to the left chambers 15c, 18c of the two sub-cylinders 15, 18, and allows lubricating oil or cooling water to flow out of the right chambers 15b, 18b. I have.

Thus, both main cylinders 13,
When the sixteen cylinder rods 13a and 16a reach the left end position, as shown in FIG.
Is switched to the B state. The second directional control valve 12 remains in the D state. In this state, the high-pressure air from the high-pressure air source 1 does not flow into the first to fourth main pipes 27 to 30, and the left chambers 15c, 1 of the sub-cylinders 15, 18 are not.
8c, and lubricating oil or cooling water flows out of each of the left chambers 15c and 18c. At the same time, the internal pressure of the left chambers 15c, 18c of each of the sub-cylinders 15, 18 increases and returns to the original pressure. This state is continued for 5 seconds.

After the time lag of 5 seconds, when the first directional switching valve 10 is switched to the C state and the second directional switching valve 12 is switched to the E state, the state returns to the state shown in FIG.
One cycle ends. FIG. 11 shows a time chart of one cycle. By repeating such one cycle, lubricating oil and cooling water can be supplied to the injection nozzle 23 at a constant pressure without interruption. In this embodiment, the high-pressure air supplied to the injection nozzle 23, the lubricating oil 20, and the cooling water 22 are set to have the same pressure.

As shown in FIG. 12, the injection nozzle 23 has an air flow path formed therein.
The lubricating oil flow path and the cooling water flow path (these flow paths are not shown) are formed to join the air flow path. Also, a nozzle-side pipe 4 is connected to the air flow path,
The LUB outflow pipe 44 is connected to the lubricating oil flow path, and the COOL outflow pipe 50 is connected to the cooling water flow path. And
The lubricating oil 20 and the cooling water 22 of the same pressure flow into the high-pressure air flowing through the air flow path of the injection nozzle 23, and a mixed mist of the lubricating oil 20 and the cooling water 22 is ejected from the injection port 23a of the injection nozzle 23. Like that.

As described above, in this embodiment, high-pressure lubricating oil 20 and cooling water 22 can be supplied to the injection nozzle 23 together with high-pressure air using the six cylinders 13 to 18. Moreover, the high-pressure air source 1 is 1
Only one, economical and miniaturizable. Further, both follower cylinders 14 and 17 and both sub cylinders 1
Since 5, 18 are arranged horizontally, no extra air bleeding mechanism is required compared to the case where they are arranged vertically,
Processing costs are reduced.

FIG. 13 shows a modification of the injection nozzle 23. In this example, as the injection nozzle 23, the air supply pipe 6 having one end communicating with the nozzle-side pipe 4 (see FIG. 1).
0, a cooling water supply pipe 61 having one end communicating with the COOL outflow pipe 50 (see FIG. 1), and one end having LUB.
A lubricating oil supply pipe 62 communicating with the outflow pipe 44 (see FIG. 1) is provided. In addition, the air supply pipe 60
A substantially cylindrical nozzle body 63 at the tip (other end) 60a of the nozzle
Is fixed inside, and an inner hole 63a of the nozzle body 63 is fixed.
The distal ends (the other ends) of the cooling water supply pipe 61 and the lubricating oil supply pipe 62 are inserted through the holes. As shown in FIG. 14, the distal ends of the cooling water supply pipe 61 and the lubricating oil supply pipe 62 are held and fixed in a gas-tight manner on a holding plate 64 fixed to the distal end opening 63b of the nozzle body 63. .

The nozzle body 63 has a tapered surface portion 73 whose diameter is reduced in a truncated cone shape toward the front end surface on the outer peripheral surface of the front end portion thereof. An annular gap 70 is formed between the tip 60 and the inner peripheral surface of the tip 60 a. Eight air flow holes 75 are formed at equal intervals in the nozzle body 63 corresponding to the gap 70 (see FIG. 15).

In the above configuration, the air supply pipe 60
To supply the cooling water 22 to the cooling water supply pipe 61 and supply the lubricating oil 20 to the lubricating oil supply pipe 62,
The cooling water 22 is injected from the tip of the cooling water supply pipe 61, and the lubricating oil 20 is injected from the tip of the lubricating oil supply pipe 62. At the same time, the high-pressure air supplied to the air supply pipe 60 flows into the inner hole 63 a of the nozzle body 63, and then blows out the gap 70 through each air circulation hole 75. The cooling water 22 flows along the outer peripheral surface of the end portion and the tapered surface portion 73 (see arrow S in FIG. 13), and is jetted from the tip of the cooling water supply pipe 61 and the tip of the lubricating oil supply pipe 62. Collides with the lubricating oil 20. Thereby, the cooling water 22 and the lubricating oil 20 are mixed with each other while being atomized into fine particles. On the other hand, when the compressed air flows along the outer peripheral surface of the inner end portion of the nozzle body 63 and the tapered surface portion 73, the surrounding air accompanies and creates an entrained flow (see arrow U in FIG. 13). For this reason, the mixed mist is amplified to a large flow rate by the accompanying flow. Further, the amplified flow of the mixed mist has a strong thrust, and strongly hits a work surface of a workpiece (not shown) and a work surface of a processing tool (not shown) pressed against the work surface.

In the injection nozzle 23 of this example, the cooling water 22
And the lubricating oil 20 are made into a mist and then mixed, so that both can be sufficiently mixed. Further, since the cooling water 22 and the lubricating oil 20 are not mixed in the nozzle body 63, the mixing time of the two is short, and the lubricating oil 20 hardly deteriorates. In addition, since the mixed mist has a sufficient force to blow off chips and the like generated during processing, chips and the like do not accumulate around the processing portion, which is combined with the above-mentioned amplified large flow of air. High cooling effect. In addition, since the discharged mixed mist appropriately moistens the workpiece and the processing tool and enhances the lubricity, the processing performance is improved.
Therefore, there is an advantage that the load on the working tool is reduced, and there is no intermittent thermal shock because the cooling is not abruptly performed as in the case of liquid pouring, and the tool life is greatly extended.

FIG. 16 shows another modification of the injection nozzle 23. In this example, the first and second air supply pipes 81 and 82 (one end of each of the air supply pipes 81 and 82 are connected to the nozzle side pipe 4 from the lower end face of the machining center main body 80).
Two branch pipes (not shown) branching from the tip of [see FIG. 1] extend. A cooling water supply pipe 83 having one end communicating with the COOL outflow pipe 50 is provided inside the first air supply pipe 81, and one end is provided inside the second air supply pipe 82. A lubricating oil supply pipe 84 communicating with the LUB outflow pipe 44 is provided (see FIG. 17). The opening of the tip of the cooling water supply pipe 83 is air-tightly fixed to the injection nozzle 81 a at the tip of the first air supply pipe 81, and the injection nozzle 8 at the tip of the second air supply pipe 82.
The opening at the tip end of the lubricating oil supply pipe 84 is hermetically fixed to 2a. The injection nozzle 81a of the first air supply pipe 81 is positioned toward the rake face of the processing tool 86, and the injection nozzle 82a of the second air supply pipe 82 is positioned at the escape surface of the processing tool 86. It is positioned towards the side. In FIG. 16, reference numeral 85 denotes an air circulation hole. In FIG. 17, reference numeral 87 denotes a workpiece.
88 is a tool holder.

In the above configuration, both air supply pipes 81,
When the high-pressure air is supplied to 82, the cooling water 22 is supplied to the cooling water supply pipe 83, and the lubricating oil 20 is supplied to the lubricating oil supply pipe 84, the injection nozzle 81 a of the first air supply pipe 81
The cooling water 22 is supplied to the rake face side of the processing tool 86 in the form of mist, and the lubricating oil 20 is supplied in the form of mist to the relief side of the processing tool 86 from the injection nozzle portion 82a of the second air supply pipe 82. In addition, when the high-pressure air supplied to each of the air supply pipes 81 and 82 flows along the outer peripheral surfaces of the injection nozzle portions 81a and 82a, an accompanying flow is created. Therefore, it is possible to supply a mist that is particularly excellent in the cooling effect and the processing dust removal effect.

The injection nozzle 23 of this embodiment has the same operation and effect as the injection nozzle 23 shown in FIG. Moreover, since the mist-like cooling water 22 is supplied to the rake face side of the processing tool 86 and the mist-like lubricating oil 20 is supplied to the relief face side of the processing tool 86, it has an excellent cooling effect and lubrication effect. .

In the above embodiment, the lubricating oil 20 and the cooling water 22 are supplied to the injection nozzle 23. However, the present invention is not limited to this, and only one of them may be supplied. Good. In addition to the lubricating oil 20 and the cooling water 22, various liquids such as an emulsion and a chemical can be supplied to the injection nozzle. Further, three or more kinds of liquids may be supplied to the ejection nozzle 23.

In the above embodiment, each cylinder 1
Although high-pressure air is used to drive 3 to 18, it is not limited to this, and various gases and liquids (for example, oil) can be used. Further, each of the cylinders 13 to 18 may be driven by various driving means such as a motor. In the above embodiment, an on-off valve and a flow control valve can be attached to the nozzle side pipe 4, the LUB outflow pipe 44 and the COOL outflow pipe 50. In the above embodiment, the nozzle-side pipe 4, the LUB outflow pipe 44 and the COOL outflow pipe 5
0 may be branched into a plurality of lines. Also in this case, an on-off valve and a flow control valve can be attached to each branch pipe. In the above embodiment, each of the cylinders 13 to 18
Are arranged horizontally, but may be arranged vertically.

In the above embodiment, when the cylinder rods 13a, 16a of the main cylinders 13, 16 reach the right end positions, the first directional control valve 10 is set to the C state, and the second directional control valve 12 is set to the D state. Although a time lag is provided in the state described above, the time lag may be provided in a state in which the first direction switching valve 10 is in the B state and the second direction switching valve 12 is in the D state.
When the cylinder rods 13a and 16a reach the left end positions, the first directional control valve 10 is set to the B state,
The second directional control valve 12 is set in the D state and a time lag is provided.
A time lag may be provided in a state where 0 is in the A state and the second direction switching valve 12 is in the D state.

[0047]

As described above, according to the liquid supply apparatus of the present invention, the liquid sucked up by the first cylinder can be supplied to the injection nozzle without interruption using the second cylinder. In addition, since the cylinder is used, the liquid can be supplied to the ejection nozzle in a high pressure state. Moreover, since the liquid in the tank is sucked up using the negative pressure generated in the cylinder chamber of the first cylinder, the liquid can be constantly replenished to the tank.

Also, in the present invention, first backflow preventing means for preventing liquid in the cylinder chamber of the first cylinder from flowing back into the tank from the suction port in the above-mentioned discharge state, When a second backflow preventing means for preventing the liquid in the cylinder chamber from flowing backward from the inflow port into the cylinder chamber of the first cylinder is provided, the liquid sucked from the tank returns to the tank, The liquid flowing into the cylinder chamber of the cylinder is the first
Efficient liquid supply can be performed without returning to the cylinder chamber of the cylinder.

Also, in the present invention, a high-pressure fluid supply source and a main cylinder operated by the high-pressure fluid supplied from the high-pressure fluid supply source are provided, and the cylinder rod of the main cylinder and the cylinder rod of the first cylinder are provided. When the cylinder rod of the second cylinder is moved to one side by the high-pressure fluid supplied from the high-pressure fluid supply source, the first and second cylinders are connected to each other by the high-pressure fluid. It can be operated by the high-pressure fluid supplied from the supply source, and in terms of power consumption,
It is economical.

Further, in the present invention, when the high-pressure fluid is supplied from the high-pressure fluid supply source to the injection nozzle and merged with the liquid flowing from the second cylinder into the injection nozzle, the first high-pressure fluid is supplied to the first nozzle. The high pressure fluid supply source for operating the second cylinder and the high pressure fluid supply source for supplying the high pressure fluid to the injection nozzle can be shared.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a liquid supply device of the present invention.

FIG. 2 is a sectional view showing a backflow prevention unit.

FIG. 3 is a front view of the pipe joint.

FIG. 4 is a plan view of a valve body.

FIG. 5 is a sectional view showing the operation of the backflow prevention means.

FIG. 6 is an explanatory diagram showing an operation of the liquid supply device.

FIG. 7 is an explanatory diagram showing an operation of the liquid supply device.

FIG. 8 is an explanatory diagram showing an operation of the liquid supply device.

FIG. 9 is an explanatory diagram showing an operation of the liquid supply device.

FIG. 10 is an explanatory diagram showing an operation of the liquid supply device.

FIG. 11 is a diagram showing a time chart.

FIG. 12 is an explanatory diagram of an injection nozzle.

FIG. 13 is a sectional view showing a modification of the injection nozzle.

FIG. 14 is a front view of the injection nozzle.

FIG. 15 is a sectional view of a main part of the injection nozzle.

FIG. 16 is a sectional view showing another modification of the injection nozzle.

FIG. 17 is an explanatory diagram showing a use state of the injection nozzle.

FIG. 18 is a sectional view showing a conventional example.

FIG. 19 is a perspective view showing another conventional example.

[Explanation of symbols]

 14 LUB following cylinder 15 LUB sub-cylinder 19 LUB tank 20 Lubricating oil

Claims (4)

[Claims] 1. A tank for containing a liquid, a first cylinder having its own suction port communicating with the tank, an inlet of its own communicating with a discharge port of the first cylinder, and an outlet of its own. A second cylinder communicating with the injection nozzle of the machine tool, and moving the cylinder rod of the first cylinder to one side to utilize the negative pressure generated in the cylinder chamber of the first cylinder to remove the liquid in the tank. A suction state in which the liquid is sucked from the suction port into the cylinder chamber, and a discharge state in which the liquid in the cylinder chamber is discharged from the discharge port by moving the cylinder rod to the other side. The liquid discharged from the discharge port is caused to flow in from the inflow port, a part of the liquid is flown out from the outflow port, and the other part is formed in the second cylinder. Condition in the cylinder chamber of the
A liquid supply device wherein the liquid in the cylinder chamber of the second cylinder can be switched to an outflow state in which the liquid in the cylinder chamber of the second cylinder flows out of the outflow port by moving a cylinder rod of the second cylinder to one side in the suction state. . 2. A first backflow preventing means for preventing the liquid in the cylinder chamber of the first cylinder from flowing backward from the suction port into the tank in the discharge state, and a liquid in the cylinder chamber of the second cylinder in the discharge state. To prevent backflow from the inlet into the cylinder chamber of the first cylinder.
2. The liquid supply device according to claim 1, further comprising a backflow prevention means. 3. A high-pressure fluid supply source, and a main cylinder operated by high-pressure fluid supplied from the high-pressure fluid supply source.
3. The liquid according to claim 1, wherein the cylinder rod of the second cylinder is moved to one side by a high-pressure fluid supplied from the high-pressure fluid supply source, the cylinder rod of the second cylinder being operably connected to the cylinder rod of the cylinder. Feeding device. 4. The liquid supply apparatus according to claim 3, wherein the high-pressure fluid is supplied from the high-pressure fluid supply source to the ejection nozzle, and merges with the liquid that has flowed into the ejection nozzle from the second cylinder.