JP3287509B2 - Lubrication rolling equipment in hot 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 lubricating rolling machine in a hot rolling mill for rolling a semi-solid lubricant on the surface of a rolling roll such as a work roll or a backup roll under a high temperature environment.

[0002]

2. Description of the Related Art Conventionally, work rolls and backup rolls used in hot rolling mills have been used to reduce roll wear in hot rolling and improve the surface quality of steel sheets.
A so-called lubricating rolling method is known in which a semi-solid lubricant is mixed with a gas and rolled while being supplied in a mist state. As the above-mentioned semi-solid lubricant, grease or a lubricant obtained by adding a heat insulating agent, an extreme pressure additive, or the like to grease is used.

As means for supplying the semi-solid lubricant, for example, Japanese Patent Application Laid-Open No. 61-63311 discloses a tank mechanism for containing and heating a semi-solid lubricant, and a tank mechanism for fluidizing from the tank mechanism. There has been proposed a pumping mechanism for pumping the lubricated lubricant to a nozzle directed to a work roll, and a cooling mechanism provided in the nozzle portion. In addition, Japanese Unexamined Patent Publication No.
In the publication No. 8508, a dome body forming a lubricant atomizing chamber for mixing lubricant and spray air is provided at the tip, and a lubricant atomizing air hole is opened in the lubricant atomizing chamber. The orifice at the tip of the body, which is the opening for spraying the lubricant, is cut out in a vertically symmetrical fan shape outward and operates at a predetermined pressure equal to or higher than the pipe resistance in the lubricant flow path. A spray nozzle provided with a switching valve body for discharging / stopping lubricant is disclosed.

[0004]

However, in the above-mentioned conventional examples of JP-A-61-63311 and JP-A-3-8508, the flow switching valve such as a three-way solenoid valve or a two-way solenoid valve and the spray are used. Since the nozzle and the nozzle are separated and connected by a pipe line, and since the on / off switching valve body is built inside the spray nozzle, it is used.
There are various problems as follows. Since the residence time of the semi-solid lubricant in the piping between the flow path switching valve and the spray nozzle is long, the semi-solid lubricant in the pipe is heated and deteriorated by heat from the surroundings. May cause blockage. In order to prevent this, it is necessary to configure the pipe line with a double pipe as in JP-A-61-63311 and take measures such as water cooling.
There are drawbacks such as complicated equipment and high equipment cost. Further, having an external flow path switching valve and an on / off switching valve element in the spray nozzle in duplicate has a problem in that the operation sequence is complicated and equipment costs and maintenance costs are increased. Further, since it is structurally difficult to attach a sensor for detecting the opening / closing operation to the on / off switching valve body in the spray nozzle, it is difficult to detect an abnormal state of the opening / closing operation at an early stage. Semi-solid lubricants are prone to nozzle clogging, non-Newtonian flow, and it is very difficult to equalize the line resistance to each nozzle. There is.
In addition, for example, it is conceivable to measure the flow rate of each nozzle and perform feedback control of the flow rate control valve provided for each nozzle based on the signal. However, it is difficult to accurately measure the flow rate in a non-Newtonian flow. Not a target.

Therefore, it is necessary to arrange the supply pump and the nozzle of the semi-solid lubricant in a 1: 1 relationship.
As described in Japanese Patent Application Laid-Open No. Hei 3-8508, mounting a drive motor for each reciprocating pump and separately arranging a tank, an accumulator, and a solenoid valve have disadvantages such as increased equipment and maintenance costs. The present invention has been made in view of the above-mentioned problems of the related art, and supplies a semi-solid lubricant without deteriorating it. It is an object of the present invention to provide a lubricating rolling device in a hot rolling mill in which a plurality of devices are arranged in the axial direction of a rolling roll, and a flow rate of a lubricant between nozzles can be made uniform.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a lubricating and rolling apparatus in a hot rolling mill using a semi-solid lubricant spraying apparatus integrally comprising a spray nozzle, a pneumatic three-way switching valve and a manifold. A plurality of units of the semi-solid lubricant spray device are arranged in the roll axis direction toward the upper and lower rolling roll surfaces of the hot rolling mill, and a manifold inlet port of the semi-solid lubricant spray device is provided. Connecting the semi-solid lubricant supply branch line branched from the semi-solid lubricant supply main line from the supply pump connected to the storage tank,
Also, a return branch pipe branched from the semi-solid lubricant return main pipe connected to the storage tank is connected to a return pipe port of the semi-solid lubricant spray device, and the return branch pipe is connected to each of the upper and lower rolling rolls. A gear-driven pump driven by a common rotary shaft connected to one servo motor is attached to each of the semi-solid lubricant supply branches, and the spray of the semi-solid lubricant spray device is provided. A lubricating rolling machine in a hot rolling mill, characterized in that a spray gas supply pipe is connected to a spray gas inlet of a nozzle, and a gas pressure supply pipe is connected to a high-pressure gas port of the pneumatic three-way switching valve. is there.

[0007]

According to the present invention, a semi-solid lubricant spray device in which a spray nozzle and a pneumatic three-way switching valve are integrally assembled to a manifold is provided in the axial direction of upper and lower rolling rolls of a hot rolling mill. Semi-solid lubrication to each lubricant spraying device individually by a gear drive type pump that can be arranged in multiple units, and can be rotationally driven by one drive servo motor via a common rotating shaft corresponding to each of the upper and lower rolling rolls Even if there is a difference in pipe resistance to each nozzle, and even if it is a non-Newtonian semisolid lubricant, it is evenly distributed in the axial direction of the upper and lower rolling rolls. It is possible to spray at a suitable flow rate.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a lubricant spray device used in the present invention in a partial cross section. In FIG. 1, 1 is a spray nozzle, 2 is a manifold,
Reference numeral 3 denotes a receiving pipe port, 4 denotes a return pipe port, 5 denotes a pneumatic three-way switching valve comprising a spool three-way switching valve 6 and a pneumatic cylinder 7 for operating the spool three-way switching valve 6, and 8 denotes a fixed member.

In the lubricant spraying apparatus 10 of the present invention thus constructed, the manifold 2 is provided with a receiving flow passage 2a which is connected to the receiving conduit port 3 and receives the semi-solid lubricant, as shown in FIG. A supply flow path 2b connected to the nozzle 1 to feed the semi-solid lubricant to the spray nozzle 1, and a return flow path 2c connected to the return pipe opening 4 to return the semi-solid lubricant.
Are respectively drilled.

The receiving flow path 2a, the supply flow path 2b, and the return flow path 2c of the manifold 2 are connected to a receiving port 6a, a supply port 6b, and a return port 6c provided in the spool three-way switching valve 6, respectively. Then, in the spool three-way switching valve 6, the “nozzle side” for supplying the semi-solid lubricant introduced into the receiving flow path 2 a of the manifold 2 to the spray nozzle 1 or the “return side” for returning to the return pipe opening 6. Any selection switching is performed.

The return port 6c of the spool three-way switching valve 6
A restricting orifice 9 for restricting as shown in FIG. 2 is interposed between the return passage 2 c of the manifold 2. this is,
The purpose is to eliminate the drawback that the semi-solid lubricant does not smoothly return to the high pressure suitable for spraying because it has the property that smooth pressure is not transmitted due to the characteristic called non-Newtonian flow .

Next, the structure of the spray nozzle 1 is shown in FIG.
This will be described with reference to FIG. In this figure, reference numeral 11 denotes a lubricant inlet for introducing a semi-solid lubricant, which is connected to a supply passage 2b of the manifold 2. Reference numeral 12 denotes a semi-solid lubricant flow passage formed in the axial direction, which is perpendicular to the lubricant inlet 11. Reference numeral 13 denotes an atomizing chamber formed in the dome 1a provided at the tip of the main body of the spray nozzle 1.
Is drilled. Reference numeral 15 denotes a gas inlet for spraying, and 16 denotes a gas flow path for spraying.

Since the spray nozzle 1 is configured as described above, the semi-solid lubricant introduced from the lubricant inlet 11 is discharged from the tip 12 a of the semi-solid lubricant flow path 12 to the atomizing chamber 13. As a result, the gas is atomized by the spray gas introduced from the spray gas inlet 15, and is sprayed from the spray holes 14 in a predetermined spray pattern. The structure of the pneumatic three-way switching valve 5 will be described with reference to the longitudinal sectional view of FIG. In this figure, 17 is a piston fitted to the cylinder body 7a of the pneumatic cylinder 7, 18 is a spool connected to the piston 17,
Reference numeral 19 denotes a compression spring for urging the piston 17, and reference numeral 20 denotes a gas pressure supply port provided in the lid 21.

When the gas pressure is increased from the gas pressure supply port 20 to a pressure that overcomes the urging force of the spring 19, the piston 17 is pushed from right to left and moves forward, and the spool 18 is moved to the spool three-way switching valve 6 side. Go to As a result, the three valve elements 22a, 22b,
22c is simultaneously operated to connect the receiving port 6a of the spool three-way switching valve 6 to the supply port 6b, close the return port 6c, and switch to the "nozzle side". As a result, the semi-solid lubricant received in the inlet 3 of the manifold 2 is supplied to the injection nozzle 1.

Conversely, when the gas pressure from the gas pressure supply port 20 is shut off, the piston 19
17, that is, the spool 18 is pushed backward from left to right and retreats, and the supply ports 6b and the return ports 6c of the spool three-way switching valve 6 are communicated by the operation of the valve bodies 22a, 22b and 22c, and the receiving port 6a is closed. Switch to "return side". As a result, the semi-solid lubricant is returned to the return conduit 4.

In the above embodiment, the pneumatic three-way switching valve 5 has been described as operating the spool three-way switching valve 6 with the pneumatic cylinder 7. However, the present invention is not limited to this. A switching valve using a ball valve or the like may be used, and any type of operating means other than the gas pressure cylinder 7 may be used as long as it can withstand high heat and high humidity environments. From the viewpoint of the above, a device using a gas pressure type such as a diaphragm motor is preferable. In this case, it is preferable to use a coil spring or the like that returns by itself when no gas pressure is applied due to facility costs and simplicity of control.

Here, in order to confirm the switching operation of the pneumatic three-way switching valve 5 described above, it is preferable to mount a suitable valve switching position sensor and detect the position of the switching operation. FIG. 5 shows an example of the valve switching position sensor. That is, in the drawing, reference numeral 23 denotes a sensor cylinder mounted on the back surface of the pneumatic cylinder 7, and reference numeral 24 denotes a sensor piston fitted to the sensor cylinder 23. Reference numeral 25 denotes a valve body having an outer diameter smaller than the inner diameter of the sensor cylinder 23 attached to the sensor piston 24, and reference numeral 26 denotes a sensor spool connected to the valve body 25.

The sensor spool 26 is inserted through a hole 21a penetrated through the lid 21 of the pneumatic cylinder 7,
The distal end 26a is configured to always contact the rear surface of the piston 17 of the pneumatic cylinder 7. Numeral 27 is attached to the inner peripheral surface of the sensor cylinder 23 at a position substantially corresponding to the forward limit position of the piston 17 of the pneumatic cylinder 7, and is larger than the outer diameter of the sensor spool 26 and smaller than the outer diameter of the valve body 25. A ring-shaped valve seat body having an inner diameter and having an annular high-pressure gas flow passage between itself and the outer peripheral surface of the sensor spool 26, and a ring-shaped valve seat 28
A communication hole for communicating high-pressure gas by communicating spaces 29 and 30 before and after the sensor piston 24 in the inside, 31 is a compression type spring for urging the sensor piston 24, and 32 is behind the sensor piston 24 A high-pressure gas supply port is provided, 33 is a high-pressure gas exhaust port provided in front of the valve seat 27, and 34 is a high-pressure gas source. Note that, as the high-pressure gas, compressed air or high-pressure nitrogen gas or the like is usually used.

Reference numeral 35 denotes an inlet for supplying high-pressure gas from the high-pressure gas source 34
A high-pressure gas line supplied to 32, a restriction orifice 36, and a pressure switch 37 mounted on the high-pressure gas line 35 upstream of the restriction orifice 36. The restricting orifice 36 has a function of providing a back pressure in the high-pressure gas line 35 so that the pressure switch 37 reliably detects a pressure change at the time of discharging the high-pressure gas.

A method of detecting the switching position during the switching operation of the pneumatic three-way switching valve 5 using the valve switching position sensor 38 configured as described above will be described below. As normal,
The high-pressure gas is supplied to the sensor piston 24 of the valve switching position sensor 38 from the high-pressure gas source 34 in advance through the air supply port 32. Therefore, first, when the spool three-way switching valve 6 is selected to be "return side", when the piston 17 of the pneumatic cylinder 7 operates from left to right and retreats, the sensor spool 26 is moved from left to right with the movement. Therefore, a gap is generated between the valve body 25 and the valve seat 27. The high-pressure gas enters the rear space 30 via the pressure switch 36, the restriction orifice 37, and the air supply port 32, and flows into the front space 29 through the communication hole 28 of the sensor piston 24, and the valve body 25 and the valve seat body The gas is discharged to the outside through the exhaust port 33 from the gap 27. For this reason, the internal pressure in the high-pressure gas line 33 decreases, so that by detecting this pressure change with the pressure switch 37, it is possible to detect that the spool three-way switching valve 6 has operated to the return side.

On the other hand, when the spool three-way switching valve 6 is selected to be the "nozzle side", the sensor piston 24 follows the compression spring 31 following the forward movement of the piston 17 from right to left.
And it is pushed from right to left. With this, the valve body
25 comes into contact with the valve seat 27 to close the high-pressure gas passage. Therefore, the high-pressure gas in the high-pressure gas line 35 becomes equal to the pressure of the high-pressure gas source 34. By detecting this pressure change with the pressure switch 37, it can be seen that the spool three-way switching valve 6 has operated to the nozzle side.

In the above-described valve switching position sensor 38, it has been described that the communication hole 28 is provided in the sensor piston 24. However, as shown in FIG. When the sensor piston 24 is positioned, the pneumatic cylinder 7 of the sensor piston 24
If the air supply port 32 is provided on the peripheral wall of the sensor cylinder 23 between the side and the valve seat body 27, the communication hole 28 may not be provided.

The valve switching position sensor 38 is a pressure switch which controls the back pressure of the high-pressure gas line 35 which varies depending on the position of the sensor piston 24 which moves in synchronization with the movement of the gas pressure cylinder 7.
Although described as detecting at 37, a reflection plate or a through-hole is provided at an appropriate position on the sensor spool 26, light is projected using an optical fiber, and the reflected light or transmitted light is transmitted to a remote position via, for example, an optical fiber. Means for detecting with a photodetector attached to the device may be used. In short, any device that can withstand a high heat and high humidity environment may be used, but from the viewpoint of reliability and maintainability, a device that detects a change in gas pressure or an optical signal at a remote position is preferable.

Next, a lubricating rolling device in a hot rolling mill using the above-described semi-solid lubricant spraying device of the present invention will be described with reference to the system diagrams shown in FIGS. First, in FIG. 7, reference numeral 39 denotes a storage tank for storing a semi-solid lubricant, 40 denotes a supply pump attached to the tank 39, 41 denotes a main pipe for supplying a semi-solid lubricant, and 42 denotes a main pipe for supplying a semi-solid lubricant. A supply branch line branched from 41, 43 is a semi-solid lubricant return main line connected to the storage tank 39.

Reference numeral 44 denotes a gear-driven pump for adjusting the flow rate connected to the supply branch line 42, 45 denotes a servomotor, 46 denotes a common rotary shaft driven by the servomotor 45, and 47 denotes a drive mounted on the common rotary shaft. The gear 48 is a driven gear attached to the gear driven pump 44. These drive gear 47 and driven gear 48
The gear drive type pump 44 is driven at a predetermined number of revolutions.

Reference numeral 49 denotes a semi-solid lubricant supply pipe for feeding the semi-solid lubricant to the lubricant spray device 10 by pressure. Reference numeral 50 denotes a pipe attached to the discharge side of the gear drive type pump 44, and is connected to a terminal pipe and a nozzle. A relief valve for returning the semi-solid lubricant in the branch line to the storage tank 39 when a blockage or the like occurs.
And a relief pipe connecting the semi-solid lubricant return main pipe 43, 52 is a return branch pipe from the lubricant spray device 10, 53 is a pressure gauge that measures the pressure on the discharge side of the gear drive pump 44,
Reference numeral 54 denotes a rotation speed control device for controlling the servo motor 46 to a desired rotation speed.

Next, in FIG. 8, reference numeral 55 denotes a constant-pressure dry gas supply device connected to the gas pressure source 34, which comprises a filter 56, a dryer 57, a pressure increasing valve 58, and an electromagnetic valve box 59.
A plurality of solenoid valves 60 are housed in the solenoid valve box 59. Reference numeral 61 denotes a spray gas supply pipe which is connected to the spray gas inlet 15 of the spray nozzle 1 and supplies the spray gas to the spray nozzle 1, and 62 denotes a gas pressure supply of the gas pressure cylinder 7 which operates the spool three-way switching valve 6. A gas pressure supply pipe connected to the port 20 to supply gas pressure to the gas pressure cylinder 7, and 63 is connected to the high pressure gas line 35 of the valve switching position sensor 38 to supply high pressure gas to the valve switching position sensor 38. High pressure gas supply pipe.

Then, first, the supply pump 40 is driven to send out the semi-solid lubricant in the storage tank 39 to the semi-solid lubricant supply main line 41, and the servo motor 46 is controlled by the control signal from the rotation speed control device 54. To drive the gear-driven pump 44 at a predetermined rotation speed to raise the pressure of the semi-solid lubricant to a predetermined pressure, and to the lubricant spray device 10 via the semi-solid lubricant supply branch line 49. Pump solid lubricant.

Next, the solenoid valve 60 of the solenoid valve box 59 is operated to supply gas pressure to the lubricant spray device 10 through the gas pressure supply pipe 62 and the high pressure gas supply pipe 63, and the gas pressure cylinder 7 is operated. By operating the spool three-way switching valve 6 to the "nozzle side", the operating position is confirmed by the pressure switch 37.
At the same time, the atomizing gas is supplied from the atomizing gas supply pipe 61. Thereby, the semi-solid lubricant can be sprayed uniformly from the spray nozzle 1 onto the surface of the rolling roll in a rotating state (not shown).

When the rolling is completed, the solenoid valve 60 of the solenoid valve box 59 is operated to stop the gas pressure supply pipe 62, thereby setting the spool three-way switching valve 6 to the "return side" and setting its operating position. Is confirmed by the pressure switch 37.
Accordingly, the semi-solid lubricant in the lubricant spray device 10 is returned to the storage tank 39 via the return branch pipe 52 and the semi-solid lubricant return main pipe 43.

[0031]

As described above, according to the present invention,
A plurality of lubricant spray devices, which consist of an injection nozzle, a spool three-way switching valve and a pneumatic cylinder in a compact and integrated structure, are arranged in the axial direction of the rolling roll of a hot rolling mill, and are used for adjusting the flow rate corresponding to each injection nozzle The semi-solid lubricant is supplied to the respective injection nozzles through the gear-driven pumps, so that it is possible to reduce the variation in the lubricant flow rate between the injection nozzles. Since it is possible to reduce variations in surface roughness and wear in the direction, there is an effect that the life of the rolling roll can be prolonged and variations in quality in the product width direction can be reduced.

Also, a plurality of gear driven pumps corresponding to the upper and lower rolling rolls can be rotationally driven by one driving servo motor via a common rotating shaft, respectively.
Flow control with little variation can be easily performed, and it can be easily arranged in a narrow space between the rolling stands or in the vicinity thereof, whereby an effect of reducing equipment costs and suppressing maintenance costs can be expected.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial section of an embodiment of a lubricant spray device used in the present invention.

FIG. 2 is a plan view of a restriction orifice.

FIG. 3 is a longitudinal sectional view showing a structure of a spray nozzle used in the present invention.

FIG. 4 is a longitudinal sectional view of a pneumatic three-way switching valve used in the present invention.

FIG. 5 is a longitudinal sectional view showing one embodiment of a valve switching position sensor used in the present invention.

FIG. 6 is a longitudinal sectional view showing another embodiment of the valve switching position sensor used in the present invention.

FIG. 7 is a system diagram showing an embodiment of a lubricating rolling device in a hot rolling mill according to the present invention.

FIG. 8 is a system diagram of a gas pressure pipe in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spray nozzle 2 Manifold 3 Receiving conduit opening 4 Return conduit opening 5 Pneumatic three-way switching valve 6 Spool three-way switching valve 7 Pneumatic cylinder 9 Restricted orifice 10 Lubricant spray device 11 Lubricant inlet part 12 Semi-solid lubricant passage 13 Atomizing chamber 14 Injection hole 15 Gas inlet for atomization 16 Gas channel for atomization 17 Piston 18 Spool 19 Spring 20 Gas pressure supply port 23 Cylinder for sensor 24 Piston for sensor 25 Valve body 26 Spool for sensor 27 Valve seat 28 Communication Hole 31 Compression spring 32 Air supply port 33 Exhaust port 34 High pressure gas source 35 High pressure gas line 36 Restricted orifice 37 Pressure switch (pressure detector) 38 Valve switching position sensor 39 Storage tank 40 Supply pump 41 Semi-solid lubricant supply Main line 42 Supply branch line 43 Semi-solid lubricant return main line 44 Gear driven pump 45 Servo motor 46 Common rotating shaft 47 Drive gear 48 Follower gear 49 Semi-solid Lubricant supply branch pipe passage 50 the relief valve 51 a relief conduit 52 back branch pipe passage 54 speed control system 55 pressure drying gas supply device 59 solenoid valve box 60 solenoid valve 61 for spraying the gas supply pipe 62 the gas pressure supply pipe 63 a high-pressure gas supply tube

Continuation of the front page (56) References JP-A-7-9022 (JP, A) JP-A-61-49710 (JP, A) JP-A-7-204714 (JP, A) JP-A-60-227903 (JP) JP-A-61-63311 (JP, A) JP-A-3-8508 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 27/10 F16K 11/07

Claims (1)

(57) [Claims] 1. A lubricating and rolling device in a hot rolling mill using a semi-solid lubricant spray device integrally comprising a spray nozzle, a pneumatic three-way switching valve, and a manifold, wherein the semi-solid lubricant is provided. A plurality of spray devices are arranged in the roll axis direction toward the upper and lower rolling roll surfaces of the hot rolling mill, and a supply pump connected to a storage tank is provided at a manifold inlet of the semi-solid lubricant spray device. The semi-solid lubricant supply branch pipe connected from the semi-solid lubricant supply main pipe is connected to the return port of the semi-solid lubricant spray device, and the semi-solid lubricant connected to the storage tank is connected to the storage tank. A return branch line branched from the main lubricant return main line is connected, and a semi-solid lubricant supply branch line corresponding to each of the upper and lower rolling rolls is connected to one servo motor in the middle. A gear-driven pump driven by a common rotary shaft to be connected is attached, a spray gas supply pipe is provided at a spray gas receiving port of the spray nozzle of the semi-solid lubricant spray device, and the gas pressure type three-way switching. A lubricating rolling device in a hot rolling mill, wherein a gas pressure supply pipe is connected to a high pressure gas port of the valve.