JP3474019B2 - Rolling oil supply device for rolling mill - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling oil supply device for a rolling mill.

[0002]

2. Description of the Related Art As a conventional technique for supplying rolling oil to a rolling mill, rolling oil is mixed with hot water and supplied from a nozzle to the rolling mill, as disclosed in Japanese Patent Laid-Open No. 3-128113. There is a rolling oil supply device for. Its contents are shown in Figure 11.
As shown in FIG. 1, a mixer 14 for mixing rolling oil and hot water, and a rolling oil supply pipe 18 between the mixer 14 and the rolling oil tank 10 are provided.
And a three-way valve 20 for selectively connecting the rolling oil delivered from the rolling oil pump 16 to the mixer 14 or the return line 38 to the rolling oil tank 10, the mixer 14 and the nozzles N _{1 to} N.
_From the hot water supply conduit 28 to which the hot water pump 26 between the hot water tank 12 and the mixer 14 is connected, and the mixed oil shutoff valves 24A to 24C arranged in the mixed oil supply branch pipes 22A to 22C between the hot water tank 12 and the mixer 14. A bypass pipe 30 and bypass branch pipes 30A to 30C that bypass the mixer 14 and the mixed oil shutoff valves 24A to 24C to reach the mixed oil supply branch pipes 22A to 22C, and the bypass branch pipes 30A to 30C.
And the hot water shutoff valves 32A to 32C opened only when the mixed oil shutoff valves 24A to 24C are closed.

When the injection of rolling oil is stopped,
At the same time as switching the three-way valve 20 to the return pipe 38 side, the mixed oil shutoff valves 24A to 24C are closed. On the other hand, hot water shutoff valve 32A ~
By supplying hot water to the nozzle N ₁ to N ₁₀ Open 32C, it is to prevent nozzle clogging. In addition, mixer
A rolling oil check valve 34 and a hot water check valve 36 are attached to the rolling oil supply line 18 and the hot water supply line 28 connected to 14.

[0004]

By the way, in the conventional rolling oil supply device shown in FIG. 10, the pressure of the hot water supplied to the nozzle when the rolling oil is not injected is the same as when the rolling oil is injected. Therefore, the jetted hot water reaches the rolling roll. Therefore, if there is internal leakage of rolling oil from the three-way valve 20 or the mixed oil shutoff valves 24A to 24C, the rolling oil will adhere to the rolling rolls, and therefore, the material to be rolled at the start of the next rolling will be bitten. There was a problem that slippage occurred during rolling, resulting in defective biting of the material to be rolled, and slipping between the roll being rolled and the material to be rolled.

Further, in the above-mentioned conventional example, the number of shutoff valves is large, and the equipment including the control device thereof becomes complicated and expensive,
Further, since it is used in a bad atmosphere of high temperature and high humidity, there is a problem that the reliability and maintainability of the device are poor. In addition, as a means for preventing a slip accident due to the internal leakage of rolling oil as described above, for example, an actual flat tire 3-
Japanese Patent No. 81202 discloses a technique in which a shield plate that can move forward and backward is provided in the rolling oil injection passage near a front surface of a spray nozzle via a drive mechanism such as a fluid cylinder. According to this conventional example, even if there is a leak of rolling oil, it can be blocked by the shielding plate, and the effect that the rolling oil can surely be prevented from reaching the rolling roll is recognized, but the device itself becomes complicated. In addition, since the shielding plate and the drive mechanism are provided in the vicinity of the rolling stand, not only the maintainability is poor, but also it is difficult to install in a narrow space between the stands of the continuous rolling mill, which is not practical.

Further, for example, some nozzles at both ends of the nozzle group arranged in the roll axial direction according to the plate width of the material to be rolled are closed, and the rolling oil is injected only from the other nozzles, for example, in the central portion. Even in this case, in order to exert the above effects, it is necessary to divide the shielding plate in the plate width direction and move at least three shielding plates forward and backward by independent drive mechanisms. The above problems become even more complicated, such as becoming more complex.

The present invention has been made in order to solve the above-mentioned problems of the prior art. Even when there is internal leakage of rolling oil in the three-way valve, the stop valve, etc. when the rolling oil is not injected, the rolling roll is rolled. It is a first object of the present invention to provide a rolling oil supply device for a rolling mill, which can be easily installed in a narrow space and which can be prevented from adhering to the surface. It is another object of the present invention to provide a rolling oil supply device for a rolling mill having a small number of shutoff valves, a simple and inexpensive facility, and excellent reliability and maintainability.
The purpose of.

[0008]

SUMMARY OF THE INVENTION The present invention is a rolling oil supply apparatus for mixing rolling oil with a diluting fluid and supplying the rolling oil from a nozzle to a rolling mill. A rolling oil supplied via a rolling oil check valve and a mixer for mixing a diluting fluid supplied from a diluting fluid supply source through a diluting fluid supply pipe through a diluting fluid check valve, and the rolling device. A three-way valve disposed upstream of the oil check valve for selectively connecting rolling oil to the mixer or the return line of the rolling oil source, and a mixed oil supply pipe between the mixer and the nozzle. A mixed oil shutoff valve disposed in a mixed oil supply branch pipe branched from the passage, and the mixed oil bypassing the diluent fluid check pipe, the diluting fluid check valve, the mixer and the mixed oil shutoff valve from the diluting fluid supply pipeline. A bypass pipe leading to a supply branch pipe and a bypass branch pipe, and the bypass In a rolling oil supply device of a rolling mill, which is provided in a manifold and has a dilution fluid stop valve that is opened only when the mixed oil stop valve is closed, the dilution oil is supplied from a bypass pipe connection portion of the dilution fluid supply pipe line. A rolling oil supply device for a rolling mill, characterized in that a dilution fluid main stop valve is provided to reach a fluid check valve, and a throttle is provided at an upstream side or a downstream side of the dilution fluid stop valve of the bypass branch pipe, respectively. Is.

The rolling oil check valve, the diluent fluid check valve, the mixer, the mixed oil supply pipe line, the mixed oil supply branch pipe, the mixed oil stop valve, the bypass pipe, the bypass branch pipe, the diluent fluid stop valve. Desirably, the diluent fluid main stop valve and throttle are formed in a single block. Further, the throttle may be provided in the bypass pipe, or a check valve may be provided instead of the dilution fluid stop valve.

[0010]

[Operation] According to the present invention, a diluent fluid main stop valve is provided between the bypass fluid pipe connecting portion of the dilution fluid supply pipeline and the dilution fluid check valve, and the bypass pipe and / or Alternatively, since the diluting fluid throttle is provided in the bypass branch pipe, the pressure of the hot water or steam diluting fluid supplied for the purpose of preventing nozzle clogging when the rolling oil is not injected can be kept low and reaches the rolling roll. There is nothing to do. Therefore, even if internal leakage of rolling oil occurs from the three-way valve or the mixed oil shutoff valve, the leaked rolling oil will not adhere to the rolling roll together with the diluting fluid.

A rolling oil check valve, a diluting fluid check valve, a mixer, a mixed oil supply line, a mixed oil supply branch pipe, a mixed oil stop valve, a bypass pipe, a bypass branch pipe, a diluting fluid stop valve, and a dilution valve. Since the fluid main shutoff valve and the throttle are formed in an integral block, they can be easily installed even in a narrow space between rolling stands and in a bad environment. Further, since the check valve is provided instead of the dilution fluid stop valve and the throttle is provided after the check valve, the number of stop valves can be reduced and the check valve can be used when the rolling oil is not injected. The check valve is opened due to the pressure difference generated before and after, and the diluting fluid having a low pressure can be supplied to the nozzle.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. [Embodiment 1] FIG. 1 is a conduit diagram showing a first embodiment of the present invention. As shown in this figure, the rolling oil in the rolling oil tank 10 and the hot water in the hot water tank 12 are mixed by the mixer 14 and supplied to the rolling mill (not shown) through the nozzles N _{1 to} N ₁₀ . The rolling oil supply device is provided with a three-way valve 20 in a rolling oil supply pipe 18 for supplying the rolling oil from the rolling oil tank 10 to the mixer 14 via the rolling oil supply pump 16 and also includes the mixer 14 and the nozzle N _1. to N ₁₀ mixed oil shutoffs branched mixed oil supply branch pipe 22A~22C from mixed oil supply pipe 22 between the
24A to 24C are provided respectively, on the other hand, a hot water supply pipe 28 for supplying hot water from the hot water tank 12 to the mixer 14 by the hot water pump 26, and the above-mentioned three mixed oil supply branch pipes 22A to 22C.
22C, the mixer 14 and the mixed oil shutoff valve 24A-24
The bypass pipe 30 that bypasses C and the bypass branch pipes 30A to 30C branched from this to three, and the bypass branch pipes 30A to 30C are respectively arranged, and the mixed oil shutoff valves 24A to
Hot water shutoff valves 32A to 32C that are opened only when 24C is closed
And are provided.

A mixer 14 is provided in the middle of the rolling oil supply line 18.
And a rolling oil check valve 34 arranged between the hot water supply pipe 28 and the bypass pipe 30 in the middle of the hot water supply pipe 28. A shutoff valve 29 and a hot water check valve 36 are attached respectively. Further, the three-way valve 20 mixes the rolling oil sent from the rolling oil tank 10 with a mixer.
14-way or return line to return to rolling oil tank 10
It can be selectively switched to 38.

The mixed oil supply branch pipe 22A has nozzles N ₁ and N ₁₀ arranged at both ends of the material to be rolled in the plate width direction, and the mixed oil supply branch pipe 22B has four nozzles at the center of the material to be rolled in the plate width direction. Nozzle N
_{4 to} N ₇ , and the mixed oil supply branch pipe 22C has nozzles N ₂ and N ₃ between the central four nozzles and the two nozzles at both ends.
And N ₈ and N ₉ , respectively. And
Each bypass branch pipe 30A to 30C of the bypass pipe 30 is provided with a throttle such as a restriction orifice on the downstream side of the hot water shutoff valve 32A to 32C.
51A to 51C are provided. Because of the pressure loss caused by the diaphragm 51A to 51C, since the time of non-ejection of the rolling oil pressure of the hot water flowing through each bypass branch 30A~30C can be kept low, hot water ejected from the nozzles N ₁ to N ₁₀ rolling Unable to reach the roll. Therefore, if a three-way valve 20 or a mixed oil shutoff valve 24 attached to the rolling oil supply line 18
Even if rolling oil leaks from A to 24C, it does not adhere to the rolling roll.

FIG. 2 shows the mixer 14, the mixed oil supply pipe 22, the mixed oil supply branch pipes 22A to 22C, and the mixed oil shutoff valve 24A.
-24C, bypass pipe 30, bypass branch pipes 30A-30C, hot water shutoff valves 32A-32C, hot water main shutoff valve 29, throttles 51A-51C
And a rolling oil check valve 34 and a hot water check valve 36 are integrally formed in a block 40, which is a three-dimensional conduit diagram showing the overall dimensions of the block 40 being about 150 mm × 177 mm × 192 mm. mm and is constructed very compactly, the distance from the mixed oil shut-off valve 24A~24C up nozzle N ₁ to N ₁₀ is within 1.5 m.

The block 40 will be described in detail. First, as to the hot water main shutoff valve 29, as shown in FIG.
The end portion 28E of the hot water supply conduit 28 is open around 29SP. When the hot water main shutoff valve 29 is biased rightward in the figure by a spring 29S, the valve body 29T is separated from the valve seat 29Z and is provided in the lateral direction of the end portion 28E of the hot water supply conduit 28. The outlet end 28B of the hot water supply conduit 28, which is communicated with the inlet end 28A of the conduit 28 and is provided vertically in the figure.
To supply hot water to the hot water check valve 36. When high pressure air is introduced through the compressed air nozzle 29N at the right end of the figure,
The spool 29PS is pushed by this high-pressure air and moves leftward in the figure against the urging force of the spring 29S, and the valve body 29T comes into contact with the valve seat 29Z, so that the end portion 28E and the inlet side of the hot water supply conduit 28 are connected. Communication with the end portion 28A is cut off.

Next, as shown in FIG. 4, the rolling oil check valve 34 and the hot water check valve 36 are connected to the end portion 18A of the rolling oil supply pipe 18 which is arranged parallel to the vertical direction with respect to the drawing. The hot water supply conduits 28 are respectively connected to the inlet end portions 28A. In the figure, 34S and 36S are rolling oil check valve 34 and hot water check valve 36.
Is a spring for urging. In addition, the mixer 14 is formed with a vertical hot water passage 14A and orthogonal to the hot water passage 14A.
A rolling oil pipe 14B connected to the terminal portion 18B of the rolling oil supply pipe 18 is provided, and the rolling oil and hot water are joined at the intersection of the two and communicate with the outlet 14C. The outlet 14C is approximately 1/2 in cross-sectional area with respect to the mixed oil supply pipeline 22 connected to the three mixed oil supply branch pipes 22A to 22C, whereby the rolling oil and hot water flowing out from the outlet 14C are The mixed fluid of (1) causes a vortex flow due to the rapid expansion of the cross-sectional area of the passage, so that both are uniformly mixed.

The mixed oil supply line 22 is, as shown in FIG.
Mixed oil shutoff valve 24A which is a poppet valve arranged in the lateral direction
-24C spools 25A to 25C are communicated around.
When the mixed oil shutoff valves 24A to 24C are biased to the left in the drawing by the springs 24S, the valve bodies 42A to 42C are separated from the valve seats 44A to 44C, respectively, and the mixed oil supply pipelines are separated.
When the high pressure air is introduced from the left end of the drawing through the compressed air nozzles 46A to 46C from the left end of the drawing, the pistons 37A to 37C are pushed by the high pressure air to press the springs. Move to the right side of the figure against 24S,
The A-42C contacts the valve seats 44A-44C, respectively, whereby the mixed oil supply pipe 22 and the mixed oil supply branch pipes 22A-22C are provided.
Communication is blocked.

The hot water shutoff valves 32A to 32C for opening and closing the bypass branch pipes 30A to 30C are also poppet valves having the same construction as the mixed oil shutoff valves 24A to 24C and are operated by compressed air. . That is, as shown in FIG. 6, the bypass pipe 30 is in communication with the spools 33A to 33C of the hot water shutoff valves 32A to 32C, which are poppet valves arranged in parallel in the lateral direction.

Each of the hot water shutoff valves 32A to 32C has a valve body 47A to 32C when biased to the left in the drawing by a spring 32S.
47C separates from the valve seats 48A to 48C, and the bypass pipe
When the high pressure air is introduced from the left end of the drawing through the compressed air nozzles 49A to 49C, the pistons 50A to 50C are pushed by the high pressure air and resist the spring 32S. And move to the right side of the figure, and the valve body 47A
.. to 47C contact the valve seats 48A to 48C, respectively, so that the communication between the bypass pipe 30 and the bypass branch pipes 30A to 30C is cut off.

The mixed oil shutoff valves 24A-24C and the hot water shutoff valves 32A-32C are selectively turned on / off correspondingly. That is, for example, when the shutoff valve 24A is closed, the hot water shutoff valve 32A is opened, and conversely when the mixed oil shutoff valve 24A is closed, the hot water shutoff valve 32A is opened.
Is configured to be opened. Throttles 51A to 51C are provided on the outlet sides of the hot water shutoff valves 32A to 32C of the bypass branch pipes 30A to 30C, respectively. This diaphragm 51A
˜51C adjusts the injection pressure of the hot water injected from each nozzle group by adjusting the throttle amount according to the number and size of nozzles connected to the downstream pipelines, the pipe resistance, and the like. The pressure is reduced to an equal value, and the nozzles are not clogged in all nozzles, and the proper pressure is ensured to prevent hot water sprayed from each nozzle group from reaching the rolling rolls when rolling oil is not sprayed. Is set.

When the rolling oil is not injected, that is, three
The one-way valve 20 switches to the return pipe 38 side, and the mixed oil shutoff valve
24A to 24C and the hot water main shutoff valve 29 are closed, and the hot water shutoff valve 32
The temperature sent from the hot water pump 26 with A to 32C open.
Water is bypass pipe 30, bypass branch pipes 30A-30C and mixed
Nozzle N through the mixed oil supply branch pipes 22A to 22C₁~ N_TenWhat
When supplied, the pressure is lowered by these throttles 51A to 51C.
Depressed to reach rolling rolls (not shown)
Nozzle N with almost equal pressure ₁~ N_Ten
Is jetted from.

In this way, the rolling oil check valve 34, the hot water check valve
36, mixer 14, mixed oil supply pipe 22, mixed oil supply branch pipe 22
A-22C, bypass pipe 30, bypass branch pipe 30A-30C,
Mixed oil shutoff valves 24A-24C, hot water main shutoff valve 29, hot water shutoff valve
Since 32A to 32C and the diaphragms 51A to 51C are formed in the block 40 which is integrated, it is possible to sufficiently withstand a bad environment in the mill. Further, since it can be formed in a small size, it can be arranged in a narrow space in the rolling mill.

Next, the operation of the rolling oil supply device thus constructed will be described. The rolling oil supply pump 16 sends the rolling oil in the rolling oil tank 10 to the rolling oil supply pipe 18, and at the same time, the hot water pump 26 sends the hot water in the hot water tank 12 to the hot water supply pipe 28. At this time, the three-way valve 20 is switched to the mixer 14 side. The hot water main shutoff valve 29 and the mixed oil shutoff valve 24A to
24C is opened in advance, and hot water shutoff valve 32A ~
32C is closed. When the strip width of the rolled material to be rolled is narrow, the mixed oil shutoff valves 24A and 24C are closed and the corresponding hot water shutoff valves 32A and 32C are opened, and the nozzles N ₁ , N ₂ , N ₃ and Only hot water is injected from N ₈ , N ₉ , and N ₁₀ . The rolling oil and the hot water pumped by the rolling oil supply pump 16 and the hot water pump 26 are respectively fed to the rolling oil check valve 34.
And, the hot water check valve 36 is pushed open to reach the mixer 14, merge there, and further flow out from the outlet 14C of the mixer 14 into the mixed oil supply pipe line 22 due to a rapid expansion of the cross-sectional area. The resulting vortex allows for uniform agitation and mixing. From the mixed oil supply line 22, the mixed oil reaches the mixed oil shutoff valves 24A to 24C which are opened in advance. The mixed oil from each nozzle N ₁ to N ₁₀ via the mixed oil supply branch pipe 22A~22C is injected. Next, when the injection of the rolling oil is stopped, the three-way valve 20 is switched to the side of the return pipe 38 to the rolling oil tank 10, and at the same time, the hot water main stop valve 29 and the mixed oil stop valves 24A to 24C are closed. Open the stop valves 32A to 32C. As a result, the supply of rolling oil and hot water to the mixer 14 is stopped. On the other hand, the hot water flows from the upstream side of the hot water main shutoff valve 29 through the bypass pipe 30 and the bypass branch pipes 30A to 30C to the downstream side of the mixed oil shutoff valves 24A to 24C and the mixed oil supply branch pipes 22A to 22C.
To the nozzles N _{1 to} N ₁₀ . Then, hot water is constantly flowed in a state where the rolling oil is not sprayed, thereby preventing clogging of the nozzle. At this time, since the flow of the hot water is restricted by the throttles 51A to 51C provided in the bypass branch pipes 30A to 30C, the supply pressure to the nozzles is reduced and the pressure injected from the nozzles is reduced, so that the injection hot water is rolled. It never reaches the roll.

Here, the three-way valve 20 is switched to the return pipe 38 side, and the hot water main shutoff valve 29 and the mixed oil shutoff valve 24A.
When the hot water shutoff valves 32A to 32C are opened at the same time as the hot water shutoff valves 32A to 32C are closed, the rolling oil, hot water and hot oil between the rolling oil check valve 34, the hot water check valve 36 and the mixed oil shutoff valves 24A to 24C are Even if the mixed oil of (3) is confined as it is and hot water is supplied to the nozzle through the bypass pipe, the confined rolling oil or the like is not sucked out by the warm water.

Therefore, the mixed oil extruded by the hot water supplied through the bypass pipe 30 is the mixed oil shutoff valve 24.
Remaining only be those between A~24C and the nozzle N ₁ to N _10, which is in the prior art is to be a time lag of the stop rolling oil injection, according to this embodiment, as described above, mixed since the oil shut-off valve 24A~24C up nozzle N ₁ to N ₁₀ is about 1.5 m, the time delay of the injection and stop 1
It is extremely small within seconds.

In the above embodiment, the mixed oil shutoff valve
24A to 24C, hot water main stop valve 29 and hot water stop valve 32A to 32
Although C has been described as using a poppet valve driven by compressed air, the present invention is not limited to this, and a stop valve having another configuration may be used. Also,
The rolling oil check valve 34 and the hot water check valve 36 are arranged on both the rolling oil supply line 18 and the hot water supply line 28, but this prevents the hot water from flowing back to the rolling oil supply line 18. Further, as long as the rolling oil is prevented from being sucked out by the hot water, only the rolling oil check valve 34 on the rolling oil supply pipe 18 side may be used. This is because sucking out rolling oil with warm water
This is because it can be prevented by closing the hot water main stop valve 29.

Further, in the above embodiment, the diaphragm 51A
~ 51C for each bypass branch pipe 30A ~ 30C hot water shutoff valve 32A
Although it is provided on the downstream side of 32 C, the same operational effect is obtained on the upstream side. For example, as shown in FIG. 7 (a), one throttle 51D may be attached to the bypass pipe 30 side, and further, as shown in FIG. 7 (b), the bypass pipe 30 and each bypass branch pipe 30A to You may make it attach to each 30C. Also in this case, the diaphragm 51D can be compactly housed inside the block 40 shown in FIG. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. As shown in this figure, instead of the hot water shutoff valves 32A to 32C of the first embodiment of FIG.
52A to 52C are provided. In addition, these check valves 52
The block of the piping system to which A to 52C are attached is shown in the solid conduit diagram of FIG.

As a result, the three-way valve 20 is returned to the return line 38.
The main water shutoff valve 29 and the mixed oil shutoff valve 24.
When A to 24C is closed, a pressure difference occurs before and after the check valves 52A to 52C, so that each of the check valves 52A to 52C is opened due to this pressure difference and the hot water whose pressure is reduced by the throttles 51A to 51C. Can be made to flow in the direction of the nozzle groups N _{1 to} N ₁₀ . On the other hand, at the start of rolling oil injection, the hot water main shutoff valve
29 and is a mixed oil close valve 24A~24C are mixed oil opened will be supplied to the nozzles N ₁ to N _10, thereby the hot water pressure in the bypass pipe 30 is lowered, the check valve 52A~52
Since the pressure in the bypass branch pipes 30A to 30C on the downstream side of C rises, the pressure difference before and after the check valves 52A to 52C becomes small, so that the check valves 52A to 52C are closed by the force of the spring.

The three-way valve 20 is switched to the mixer 14 side, and the hot water main shutoff valve 29, the mixer 14, and the mixed oil shutoff valve 24A.
The rolling oil accumulated in the pipes extending to 24C to 24C is discharged from each nozzle N ₁ when the three-way valve 20 and the mixed oil shutoff valve 24A to 24C are opened.
Since ~ N ₁₀ is supplied together with hot water, the rolling oil is quickly started to be injected. In the case of this second embodiment,
In addition to the effects of the first embodiment, three hot water shutoff valves
Since 32A to 32C can be reduced, the device including the control device can be made simple and inexpensive, and the reliability and maintainability are improved even in a bad environment of high temperature and high humidity. It is possible to exert.

FIG. 10 shows that the check valve 52 is added to the piping system shown in FIG. 7 (b).
This is an example in which A to 52C are attached. This makes it possible to supply low-pressure hot water to the nozzles N _{1 to} N ₁₀ when the rolling oil is not injected. First and second described above
In the examples, the case where hot water is used for diluting the rolling oil has been described, but the present invention is not limited to this, and even if steam having a predetermined pressure, hot water, soft water, pure water, or the like is used, It has the same function and effect.

[0032]

As described above, according to the present invention,
A dilution fluid stop valve is provided in the dilution fluid supply pipe leading to the mixer, and the bypass pipe and / or the bypass branch pipe for the dilution fluid is provided with a throttle to reduce the pressure of the dilution fluid, thereby diluting when the rolling oil is not injected. Since the fluid does not reach the rolling rolls, it is possible to prevent the rolling oil that leaks internally from the three-way valve or the mixed oil shutoff valve from adhering to the rolling rolls. Also, there is an effect that slip between the rolling roll and the material to be rolled can be prevented and stable rolling can be performed.

Further, since the main constituent parts of the apparatus are integrated with the block to achieve miniaturization, the apparatus can endure a bad environment sufficiently and can be arranged in a narrow space in the rolling mill. Furthermore, since a check valve can be used instead of the dilution fluid stop valve provided in the bypass branch pipe, the number of stop valves can be reduced, and the device including the control device can be simplified, and the adverse environment can be reduced. It is possible to improve the reliability and maintainability of the device below.

[Brief description of drawings]

FIG. 1 is a pipe diagram showing a first embodiment of a rolling oil supply device according to the present invention.

FIG. 2 is a perspective view showing a main part of the first embodiment.

3 is a sectional view taken along the line II-II of FIG.

FIG. 4 is a sectional view taken along the line III-III of FIG.

5 is a sectional view taken along the line IV-IV in FIG.

6 is a cross-sectional view taken along the line VV of FIG.

7 (a) and 7 (b) are conduit diagrams showing a main part of a modified example of the first embodiment.

FIG. 8 is a pipeline diagram showing a main part of a second embodiment of the rolling oil supply system according to the present invention.

FIG. 9 is a perspective view showing a main part of the second embodiment.

FIG. 10 is a conduit diagram showing a main part of a modified example of the second embodiment.

FIG. 11 is a pipe diagram showing a conventional rolling oil supply device.

[Explanation of symbols]

10 Rolling oil tank (rolling oil source) 12 Hot water tank (diluting fluid supply source) 14 Mixer 16 Rolling oil supply pump 18 Rolling oil supply line 20 three-way valve 22 Mixed oil supply line 22A-22C Mixed oil supply branch pipe 24A-24C mixed oil stop valve 25A to 25C mixed oil stop valve spool 26 Hot water pump (dilution fluid pump) 28 Hot water supply line (diluting fluid supply line) 29 Hot water main stop valve (diluting fluid main stop valve) 30 bypass pipe 30A-30C bypass branch pipe 32A to 32C Hot water stop valve (diluting fluid stop valve) 34 Rolling oil check valve 36 Hot water check valve (diluting fluid check valve) 51A-51D Aperture 52A-52C Check valve

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Shoichi Toyonaga, 4- 1-32, Fujisaki, Narashino City, Chiba Prefecture (56) Reference JP-A-3-128113 (JP, A) JP-A-4-351211 (JP , A) JP-A-3-169414 (JP, A) JP-A-8-224612 (JP, A) Actual development 61-22203 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) B21B 27/10 B21B 45/02 310

Claims (4)

(57) [Claims] 1. A rolling oil supply device for mixing rolling oil with a diluting fluid and supplying the rolling oil from a nozzle to a rolling mill, wherein the rolling oil source passes through a rolling oil supply line and a rolling oil check valve. A mixer for mixing the supplied rolling oil and a diluent fluid supplied from a diluent fluid supply source through a diluent fluid supply pipe via a diluent fluid check valve, and on the upstream side of the rolling oil check valve. A three-way valve arranged to selectively connect rolling oil to the return line of the mixer or the rolling oil source, and a mixed oil supply branched from the mixed oil supply line between the mixer and the nozzle. A mixed oil stop valve arranged in a branch pipe, a bypass pipe that bypasses the diluted fluid check valve, the mixer and the mixed oil stop valve from the diluted fluid supply pipe line to the mixed oil supply branch pipe, and A bypass branch pipe and the mixing provided on the bypass branch pipe. In a rolling oil supply device of a rolling mill having a dilution fluid stop valve that is opened only when the oil stop valve is closed, between the bypass pipe connection portion of the dilution fluid supply pipe and the dilution fluid check valve. A rolling oil supply device for a rolling mill, characterized in that a diluting fluid main stop valve is provided, and a throttle is provided at an upstream side or a downstream side of the diluting fluid stop valve of the bypass branch pipe. 2. The rolling oil check valve, the dilution fluid check valve, the mixer, the mixed oil supply pipe line, the mixed oil supply branch pipe, the mixed oil stop valve, the bypass pipe, the bypass branch pipe, the dilution fluid stop valve described above. The rolling oil supply device for a rolling mill according to claim 1, wherein the dilution fluid main stop valve and the throttle are formed in an integrated block. 3. The rolling oil supply device for a rolling mill according to claim 1, wherein the throttle is provided in the bypass pipe. 4. The rolling oil supply apparatus for a rolling mill according to claim 1, 2 or 3, wherein a check valve is provided instead of the dilution fluid stop valve.