JPS6246756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cooling water staged variable pressure reducer used in hot rolling mills and the like that use a large amount of high-pressure water.

``Prior art'' Conventionally, the amount and pressure of cooling water for work rolls in hot rolling mills at steel mills, etc. are almost constant, and it is difficult to adjust the water pressure to correspond to changes in the width of the slab. It is difficult to appropriately remove the amount of heat conducted from the work roll to the work roll, and as a result, the work roll has a defect that causes heat to be generated, making it difficult to perform uniform rolling. In addition, since a large amount of high-pressure water is used for the above-mentioned cooling water, it is difficult to adjust the water amount and water pressure to correspond to changes in the width of the slab.There are various types of regulators, but most of them reduce the pressure in a serial direction. Therefore, the adjustment range was narrow and it was difficult to respond to changes in water volume from a large amount to a small amount in a depressurization control state (Utility Model Application No. 142835, 1983, Utility Model Application No. 142835, 1982).
No. 15612, Jitko No. 52-14252). Furthermore, although there are devices in which throttling means are provided in parallel, each throttling means requires a switching valve, making the structure complicated and difficult to easily apply to extremely large amounts of high-pressure water. ).

"Problems to be Solved by the Invention" The present invention aims to provide a variable pressure reducer that reduces the pressure of a large amount of high-pressure water to a predetermined value, has a wide range of adjustment for switching from large to small amounts, and has a simple mechanism. It is something to do.

"Means for solving the problem" The present invention opens a high-pressure water supply port at one end of the cylinder,
A reduced-pressure water supply port is opened at the other end, an orifice pressure-reducing part is provided in the middle of the cylinder, and a water passage communicating with the water supply port and the water supply port is formed through the pressure-reducing part, respectively. Each of the water passages is provided with a bypass water passage that opens toward the outer peripheral surface of the cylinder, and a short cylinder fixed to the outer peripheral surface of the cylinder in the sliding direction is rotatably fitted in a close state, so that the same rotation is possible. One or more orifice pressure reducing parts with stepwise different diameters are arranged in parallel inside the short cylinder, and the high pressure water supply port and the reduced pressure water supply port of the pressure reducing part are respectively opened toward the inner circumferential surface of the short cylinder, It is constituted by a step-type variable pressure reducer having a configuration in which the water supply port and the water supply port are aligned with the opening of the bypass passageway.

"Function" Therefore, when the water supply pump 29 is started, the discharged high pressure water (approximately 80 kg/cm ² ) can be supplied into the circle 1 through the high pressure water supply pipe 20. At that time, as shown in FIG.
If it does not match 0, the high-pressure water passes through the orifices 4'', 4'', 4'', 4'' and the rapid expansion chambers 4', 4', 4' in the cylinder 1, and suddenly contracts, expands rapidly, and changes the flow direction. The water pressure and amount of water can be adjusted to a predetermined level by the change (in the right angle direction), and the water can be sent to the fountain nozzle 31 via the reduced pressure water pipe 21. When the handle 24 is rotated from the position shown in FIG. 4 to the position shown in FIG. The water supply port 13' and the reduced pressure water supply port 14' are aligned with each other, and a portion of the high pressure water can be supplied to the orifice pressure reducing portion 12' through the opening 7, as shown in FIG. The supplied high pressure water is supplied to the orifice 18', 1
7', 18' and rapidly expanding chambers 16', 16', the water is adjusted to a predetermined water pressure and amount by rapid contraction, rapid expansion, and change in flow direction (perpendicular direction), and then passes through the reduced pressure water supply port 14'. It joins the reduced pressure water in the cylinder 1 and can be sent to the fountain nozzle 31 at a desired water pressure and amount through the reduced pressure water pipe 21. Furthermore, the handle 24 is shown in FIG. 6 or 7.
When rotated to the position shown in the figure, the openings 7, 8
The orifice pressure reducing part 1 in the rotating short cylinder 11 is
The 2'' or 12 high-pressure water supply ports 13'' or 13 and the low-pressure water supply ports 14'' or 14 are matched, respectively, so that the desired water pressure and water amount can be adjusted.

"Example" A high pressure water supply port 2 is opened at one end of the cylinder 1, a reduced pressure water supply port 3 is opened at the other end, an orifice pressure reducing part 4 is provided in the middle of the cylinder 1, and the pressure reducing part 4 is Water passages 5 and 6 are formed to communicate the water supply port 2 and the water supply port 3 via the water supply port 3, respectively. As shown in FIG. 1, FIG. 2, and FIG. 3, the orifice decompression section 4 has three orifices (an odd number of ) rapid expansion chamber 4' and these rapid expansion chambers 4', 4',
The orifices 4'', 4'' which alternately communicate with the enlarged chambers 4' at opposite ends of the enlarged chambers 4', and the enlarged chambers 4', 4' located at both ends of the enlarged chambers 4' are connected to the water passage 5. , 6, respectively. Openings 7 and 8 are provided in the water passages 5 and 6, respectively, toward the outer peripheral surface of the cylinder 1.
Bypass water passages 9 and 10 are provided. A divided collar 15 is attached to the outer peripheral surface of the cylinder 1 formed in this way.
The short tube 11 fixed in the sliding direction is rotatably and tightly fitted into the rotating short tube 11, and the inside of the rotatable short tube 11 has a diameter stepped in stages as shown in FIGS. 1 and 2. Three orifice pressure reducing parts 12 having different pressures are arranged in parallel along the inner circumferential surface of the short tube 11, and these pressure reducing parts 1
2', 12'', 12 high pressure water supply ports 13', 13'',
13 and reduced pressure water supply ports 14', 14'', 14 are opened toward the inner circumferential surface of the short tube 11, respectively.The orifice pressure reducing parts 12', 12'', 12
As shown in FIGS. 1, 2, and 3, there are a pair of rapid expansion chambers 1 provided at both ends of the short tube 11.
6', 16', 16'', 16'', 16, 16 and these rapidly expanding chambers 16', 16', 16'', 16'', 16
, 16, orifices 17',
17'', 17 and these enlarged chambers 16', 16'', 1
6 to the water supply ports 13', 13'', 13, respectively.
and orifices 18', 18'', 18 connected to the water supply ports 14', 14'', 14. The water supply ports 13', 13'', 13 and the water supply ports 14', 14'', 14 are arranged to correspond to the openings 7, 8 of the bypass passages 9, 10, respectively. In the figure, 19 indicates connection flanges screwed onto both ends of the cylinder 1, 20 indicates a high-pressure water supply pipe, 21 indicates a reduced-pressure water supply pipe, and 2
2 is a split collar fitting groove provided on the outer peripheral surface of the cylinder 1; 23 is a bolt for mounting the short cylinder 11 and the split collar 15; 24 is a rotating handle provided on the collar 15; 25 is the handle 24; 26 is a pressing spring for the pin 25; 27 is a positioning pin hole drilled in the outer peripheral surface of the cylinder 1;
8 is an O-ring, 29 is a water supply pump, 30 is an on-off valve operated by a fluid pressure cylinder or an electric motor, 31 is a fountain nozzle, 32 is a work roll of a hot rolling mill, and 33 is a step-type variable pressure reducer.

"Effects" Since the present invention is configured as described above, when cooling the work roll 32 in a hot rolling mill such as a steel mill with cooling water during slab rolling, the rotating short cylinder 11 is connected to the cylinder 1. The same short tube 1 that can be easily rotated
Since the orifice pressure reducing parts 12 arranged in parallel in the pressure reducing part 12 having different diameters in stages can be aligned with the bypass water passages 9 and 10, a part of the high pressure water supply (approximately 80 kg/cm ² ) can be transferred to the pressure reducing part 12. There is a practical advantage that the water pressure and water amount can be adjusted stepwise to correspond to the width of the slab (narrow width, wide width), and the water pressure and water amount of the cooling water used for the work rolls 32 can be adjusted very easily in accordance with the width of the slab (narrow width, wide width). Moreover, it has the advantage of having a simple structure and being highly adaptable to automatic control. That is, it is possible to reduce the pressure of a large amount of high-pressure water and to easily and quickly adjust and control the amount of reduced-pressure water from a large amount to a small amount.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing the staged variable pressure reducer of the present invention, FIG. 2 is a longitudinal sectional side view taken along line AA in FIG. 1, and FIG. 3 is a longitudinal sectional side view taken along line BB in FIG. 1.
FIGS. 4, 5, 6, and 7 are explanatory diagrams showing the operating state of the rotary short tube, and FIG. 8 is a piping diagram showing the operating state. 1...Cylinder, 2...High pressure water supply port, 3...Reduced pressure water supply port, 4...Orifice pressure reduction part, 5, 6...... Water passage, 7, 8... Opening, 9, 10... Bypass water passage , 11... short cylinder, 12... orifice pressure reducing part, 13... high pressure water supply port, 14... reduced pressure water supply port.

Claims (1)

[Claims] 1 A high pressure water supply port 2 is opened at one end of the cylinder 1, a reduced pressure water supply port 3 is opened at the other end, and an orifice pressure reducing part 4 is provided in the middle of the cylinder 1, and the above water is supplied through the pressure reducing part 4. A bypass water passage 9, which forms water passages 5, 6 that communicate the water supply port 2 and the water supply port 3, and has openings 7, 8 in these water passages 5, 6, respectively, toward the outer peripheral surface of the cylinder 1; 10, and a short cylinder 11 fixed in the sliding direction on the outer circumferential surface of the cylinder 1 is rotatably fitted in a close state, and the diameter is changed stepwise inside the rotatable short cylinder 11. One or more orifice pressure reducing parts 12 are arranged in parallel, and the high pressure water supply port 13 and the reduced pressure water supply port 14 of the pressure reducing part 12 are respectively opened toward the inner circumferential surface of the short cylinder 11.
and the water supply port 14 to the bypass waterways 9, 10.
A stepped variable pressure reducer having a configuration that matches the openings 7 and 8 of the.