JPH0525569B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application of the Invention] The present invention is applicable to, for example, a high-pressure water injection device for removing scale from heated steel materials for hot rolling, a cooling water injection device for cooling rolling rolls of a hot rolling mill, etc. The present invention relates to a fluid ejecting device.

[Prior art and its problems] Fluid injection nozzles used in the above-mentioned high-pressure water injection device for scale removal, cooling water injection device for cooling rolling rolls, etc. have conventionally been introduced in Japanese Patent Publication No. 58-27009, By simply forming a fluid flow path between the fluid inlet and the fluid injection port, the maximum width of the heated steel material for hot rolling or the entire width of the rolling roll can be achieved without providing a mechanism for switching between fluid injection and stop. Fluid injection from all of the plurality of fluid injection nozzles and its It was being stopped.

For this reason, even if the descaling width of the heated steel material is changed or the hot rolling width of the rolling roll is changed, the fluid is always injected over the entire maximum width range, resulting in an inappropriate fluid injection area. exists,
This resulted in loss of fluid and excessive power consumption of the fluid supply pump.

The inventors proposed Japanese Utility Model Application No. 60-58265 as a fluid ejecting device to solve this problem.
This is shown in FIG.

a piston valve, which is provided at the rear of the piston valve and has a movable cylinder having a fluid inlet/outlet passage provided between a fluid inlet and a fluid ejection port, and has a tip for opening and closing the ejection port; a spring mechanism that presses the tip of the piston valve at the outlet; and a filling chamber that communicates with the fluid inlet and the jet port and covers at least the gathering part that covers the tip of the piston valve and the stepped surface of the piston. A fluid injection nozzle N configured by internally installing each of these is used in a cooling device 50 for upper and lower rolling rolls WR ₁ and WR ₂ of a hot rolling machine, and coolant water of a predetermined pressure for injection cooling is supplied. A main cooling water supply pipe 51 to be supplied, a general opening/closing valve 52 interposed in the main supply pipe 51, branch pipes 53 and 54 branched from the main supply pipe 51, and connected to the branch pipe 53 to control the upper rolling roll WR ₁ . An upper header 55 arranged along the entire surface width direction, a lower header 56 connected to the branch pipe 54 and arranged along the entire surface width direction of the lower rolling roll WR ₂ , and a predetermined header 55, 56 arranged in the longitudinal direction of each header 55, 56. Fluid injection nozzles N arranged at intervals are connected to each fluid outlet/inlet passage 6 of each fluid injection nozzle N, and communicated with a fluid supply main pipe 57 having a predetermined pressure exceeding a predetermined pressure for injection cooling of the injection fluid. The connected fluid supply pipes 12a, the opening pipes 58 branched from each fluid supply pipe 12a, and the opening pipes 58 which are interposed between each opening pipe 58 and each fluid supply pipe 12a and open the supply pipe 12a, and at the same time open the opening pipe 58. is closed to supply fluid into the cylinder 9 and lock the opening operation of the piston valve 5, and at the same time as the supply pipe 12a is closed, the opening pipe 58 is opened to stop the fluid supply into the cylinder 9. It also includes an on-off valve 59 for unlocking the opening operation of the piston valve 5 in the cylinder 9, and an on-off controller 60 for the on-off valve 59.

In other words, the on-off valve 59 is controlled by the controller 60 to control only the fluid injection nozzle group Nc corresponding to the width in the cylinder 9 according to the change in the rolling surface width _of the upper and lower rolling rolls WR ₁ and WR 2 . The piston valve 5 is automatically opened and closed by opening and closing the general on-off valve 52 to enable injection and stop of the injection fluid, and the other fluid injection nozzle groups
Only Ns is selectively set and controlled so that even if the general on-off valve 52 is opened or closed by supplying fluid at the predetermined pressure into the cylinder 9, the piston valve 5 remains closed.

However, this has the problem that it is necessary to provide the fluid supply pipe 12a, the opening pipe 58, and the on-off valve 59 for all the fluid injection nozzles N, which increases the equipment cost.

[Object of the Invention] The present invention solves the problems of the above-mentioned high-pressure water injection device for scale removal and cooling water injection device for cooling rolling rolls by using a fluid injection nozzle having a built-in mechanism for injecting fluid and stopping it. were solved all at once.

[Structure and operation of the invention] The fluid injection nozzle used in the present invention is shown in Figs.
As shown in FIG. 4, between the fluid inlet 1 and the fluid outlet 2 of the fluid injection nozzles A, B, and C, there is a piston consisting of a poppet part 3 provided with an opening/closing tip of the outlet 2 and a piston 4. A valve 5, and non-injected fluid inlet/outlet passages 6, 6a, which are open to the outside and are for the piston valve.
6b, and a poppet portion 3 disposed at the tip 3 of the poppet portion 3 provided in the piston valve 5 and connected to the spout 2.
a spring mechanism 8 that presses the inlet 1;
and a gathering portion 20 that communicates with the spout 2 and covers at least the tip of the poppet portion 3 pressed by the spout 2, and/or a charging chamber 10 that covers the stepped surface 17 of the piston 4.
is installed internally.

That is, this fluid injection nozzle automatically injects and stops fluid by changing the pressure of the injection fluid flowing into the nozzle. When the injection fluid that has flowed in has a desired injection pressure, the stepped surface 17 of the piston 4 covered by the pressure chamber 10 and/or the poppet portion 3 covered by the collecting portion 20 act as pressure receiving surfaces and receive the pressure, which causes the piston valve to open. 5 overcomes the pressure of the spring mechanism 8 and slides inside the cylinder 9 toward the inlet 1 side, and moves the tip 3a of the poppet portion 3a toward the inlet 1 side and away from the spout 2 in the closed state. It is opened and the injection fluid is injected from the ejection port 2 at the required pressure onto the object to be ejected.

On the other hand, the width of the steel sheet S to be rolled or descaled varies depending on the use. Therefore, the width required for descaling or rolling roll cooling differs depending on the width dimension of the steel sheet S.

Correspondingly, as shown in FIG. 1, a plurality of the fluid injection nozzles are installed in headers 45 and 46 provided in the width direction (in the axial direction when the object to be ejected is a rolling roll) of the steel plate S, which is the object to be ejected. provided, the headers 45, 46
The external openings of the non-jetting fluid inlet/output passages 6, 6a, 6b of the fluid jetting nozzle arranged in the parts other than the minimum high-pressure water jetting width region SW _nio , which are the regions on both sides of the fluid supply pipe 12
a and 12b.

In this way, by selecting the fluid supply pipes 12a and 12b and supplying fluid, the central region in the longitudinal direction of the headers 45 and 46 (minimum high-pressure water jet width region SW _nio ) is
By adjusting the number of fluid jets from the fluid jet nozzles arranged on both sides except for the area, it is possible to eject fluid in the minimum necessary area, thereby saving power and reducing equipment costs.

[Example] Examples of the present invention will be described in detail below with reference to FIGS. 1 to 4.

The fluid injection nozzle A shown in Fig. 2 A, B, and C is as follows:
With the above-described configuration, the piston valve 5 is opened when the pressure of the injection fluid that has flowed in is equal to or higher than the required injection pressure, and is closed when the pressure of the injection fluid that has flowed in is less than the required injection pressure. FIG. 1 shows an example in which this is applied to the central region SW _nio of headers 45 and 46 in a descaling device for hot rolling heating slabs.

A fluid ejecting nozzle B shown in FIG. 3 has the structure and function of the nozzle A, and has an additional function of locking and releasing this function.

The fluid injection nozzle C shown in FIG. 4 has the structure and function of the nozzle A, and also allows the opening and closing force of the piston valve 5 to be adjusted, and in addition to the locking and releasing functions of the nozzle B, the required injection pressure of the injection fluid A function has been added that can change the opening/closing force of the piston valve 5 in response to changes in the piston valve 5. This fluid injection nozzle B
FIG. 1 shows an example in which C is applied to both side areas of headers 45 and 46 in a descaling device for a heating slab for hot rolling.

Fluid injection nozzle A in Fig. 2 A, B, and C
is a water supply pipe section 12 having an inlet port 1 for injection fluid;
A cylinder 9 with a spring mechanism 8 installed in the center thereof is formed, and the water supply pipe portion 12 is placed above the cylinder 9.
The cylinder 9 has a distribution port 13 connected in communication with the inflow port 1 of the cylinder 9, and has branch holes 14 connected to the distribution ports 13, respectively, around the cylinder 9. A first body part 15 forming the rear half of the pressure chamber 10; it is slidably fitted into the cylinder 9, and the front end of the spring mechanism 8 is installed in the rear concave part 16, so that the stepped surface 17 is filled with the first body part 15; Pressure chamber 10
A piston valve 5 having a piston 4 exposed to
and; a guide forming a front half of the pressure chamber 10 communicating and connected to the rear half of the pressure chamber 10 of the first body 15, and slidingly guiding the back and forth movement of the poppet portion 3 of the piston valve 5 at the center. This guide hole 18 has a hole 18.
It has a plurality of flow dividing holes 19 that are connected to the pressure chamber 10 along the periphery of the pressure chamber 10, and the flow dividing hole 19 is located in the center of the front part.
A second body portion 21 having a fluid collection portion 20 that is communicatively connected to each of the poppet portions 3 and facing the tip portion 3a of the poppet portion 3;
The upper part of the flange part 25 provided on the outer periphery is fitted into the front part of the second body part 21, and has a fluid jet port 2 in the center part which is connected to the fluid collection part 20, and the fluid jet port 2 The poppet portion 3 is located around the rear end (inlet) of the
a fluid ejecting tip 24 having a seat portion 22 for abutting the tip end 3a of the fluid ejecting tip 24 and having an ejecting port ring 23 at the front end (outlet) of the fluid ejecting port 2; It has a flange part 26 on the lower part that locks the lower end surface of the flange part 25 of the fluid ejection tip 24, and the upper end surface of the flange part 25 is connected to the lower end surface of the second body part 21 via a seal packing 27. It consists of a cap nut 28 that is press-fitted and fixed.

29 in FIG.
A welded joint portion with the body portion 15 is shown, and 31 represents a welded joint portion between the first body portion 15 and the second body portion 21. or,
Reference numeral 6 denotes a non-injected fluid inlet/outlet passage that extends through the cylinder side wall surface between the upward sliding movement limit position of the piston portion 4 in the cylinder 9 and the upper end wall surface of the cylinder 9 and the outer surface of the first body portion 15 and opens to the atmosphere. , for exhausting and inflowing air (non-injected fluid) within the cylinder 9 when the piston portion 4 slides within the cylinder 9.

The spring mechanism 8 is installed between the upper end surface of the cylinder 9 and the recessed part 16 of the piston part 4 in a compressed state, and the piston part 4 is moved toward the jet port 2 side at a low pressure just close to the required jetting pressure of the jetting fluid. The tip 3a of the poppet portion 3 is brought into pressure contact with the seat ring 22, thereby closing the inlet of the spout 2. In this state, if the injection fluid at the required injection pressure is supplied to the fluid inlet 1, the injection fluid will flow through the distribution port 13,
The piston part 4 stepped surface 17 which enters the charging chamber 10 through the flow dividing hole 14 and enters the gathering part 20 from the charging chamber 10 through the dividing hole 19 and is exposed to the charging chamber 10.
and the front end 3a surface of the poppet portion 3 exposed in the gathering portion 20 are pressurized toward the fluid outlet 1 side to overcome the pressing force of the piston portion 4 of the spring mechanism 8 and move the entire piston valve 5 toward the fluid inlet 1. The poppet portion 3 is moved to the side, the distal end surface of the poppet portion 3 is separated from the seat ring 22, the inlet of the fluid jet port 2 is opened, and the fluid is jetted from the jet port 2 onto the object to be jetted. Then, when the injection fluid is stopped being supplied or the injection fluid is supplied with a pressure lower than the required injection pressure, the piston valve 5
moves toward the fluid spout 2 side by the pressing force of the spring mechanism 8, presses the tip 3a of the poppet portion 3 against the seat ring 22, closes the inlet of the fluid spout 2, and stops jetting the jetting fluid. It is something to do.

The fluid injection nozzle B shown in FIG. 3 is shown in FIG.
Non-jet fluid output from fluid jet nozzle A shown in b and c.
A fluid supply pipe 12a of a fluid supply device (not shown) that can change the supply pressure and/or switch between supply and stop is connected to the inlet passage 6 via a connecting fitting 32. Supplying fluid at a pressure that prevents the piston portion 4 from moving backward even if the injection fluid at the required injection pressure is supplied into the pressure chamber 10 and the collecting portion 20 from the supply pipe 12a into the cylinder 9, This function has the added function of preventing the piston valve 5 from opening the fluid jet port 2, and also stopping the fluid supply into the cylinder 9 to release the flow. The other parts other than the supply pipe 12a are the same as the fluid injection nozzle A shown in FIGS. 2A, 2B, and 2C, and the explanation thereof will be omitted.

The fluid injection nozzle C shown in FIG. 4 is shown in FIG.
It has the structure and function of the fluid injection nozzle A shown in B and C and the fluid injection nozzle B shown in FIG. In order to be able to adjust the pressing force to allow the piston part 4 to move (opening operation of the piston valve 5) in response to changes in the required injection pressure of the fluid, a pressing force of the spring mechanism 8 is provided at the rear end of the spring mechanism 8 in the cylinder 9. The pressure adjustment piston 11 is installed and slidably fitted into the rear part of the cylinder 9, and the cylinder side wall surface and the third position between the retraction limit position of the piston portion 4 and the forward movement limit position of the adjustment piston 11 are fitted. 1. A non-injected fluid outlet/inlet passage 6a that penetrates the outer surface of the body part 15 and opens to the atmosphere, and a cylinder side wall surface and a fourth fluid outlet located between the retraction limit position of the outer adjustment piston 11 and the rear end wall surface of the cylinder. 1 body 1
5. A non-jetting fluid outlet penetrating through the outer surface and connected to a fluid supply pipe 12b of a fluid supply device (not shown) capable of changing fluid supply pressure and/or switching between fluid supply and stop. An entrance path 6b is provided.

The other parts are substantially the same as the fluid injection nozzle A shown in FIGS. 2A, 2B, and 3 and the fluid injection nozzle B shown in FIG. , B. The same or similar parts as in FIG. 2 A, B, C and FIG.

Note that the fluid ejection nozzle C in the example of FIG.
1 is located in the first body part 15 and is screwed together with the second body part 21, and is fitted and joined with the first body part 15, and the part at this fitted position forms the front part of the cylinder 9. In the intermediate portion following this, a flow dividing hole 19 with respect to the central portion of the pressurized chamber 10 and a guide hole 18 are formed as shown in the figure.

In FIG. 1, 70 is a descaling device for the heating slab S for hot rolling, which includes a main supply pipe 41 for supplying high-pressure water (150 Kg/cm ² ) for injection, an on-off valve 42 interposed in the main supply pipe 41, and a supply Branch pipes 43 and 44 branched from the main pipe 41; an upper header 45 connected to the branch pipe 43 and disposed along the upper width direction of the slab S transport path; A lower header 46 disposed along the fluid injection nozzle C, and a fluid supply main pipe having a predetermined pressure exceeding a predetermined pressure for cooling the injection of external injection fluid and communicating with each non-injection fluid outlet/inlet passage 6 of each fluid injection nozzle C. 57, and opening pipes 58 branched from each fluid supply pipe 12a, and each of the upper and lower headers 45, 46 has a descaling target slab S having the minimum width. Fluid injection nozzles A, B, and C in Figure 2 are arranged in the minimum high-pressure water jet width area for descaling (SW _nio ), and on both sides of this minimum area, the maximum high-pressure water jet width for descaling is applied to the maximum width slab. In addition to the nozzle A, the fluid injection nozzle C shown in FIG. 4 is arranged as a selected nozzle in addition to the nozzle A according to the change in the width of the target slab within the area (SW _nax ).

In this example, the fluid injection nozzles C are grouped into three selected groups C ₁ , C ₂ , C ₃ , and each group is connected to branch pipes 71 and 7 from the main supply pipe 57 .
2, 73, and each of the branch pipes 71, 72, 73 is connected to the opening pipe 74,
75, 76 are provided, and these branch pipes 71, 72, 73
For each pair of opening pipes 74, 75, and 76, the piston valve 5 is opened by simultaneously opening the branch pipe, closing the opening pipe, and supplying fluid into the cylinder 9 of the nozzle group of the group. To lock the operation and simultaneously close the branch pipe, open the open pipe to stop the fluid supply into the cylinder of the nozzle group of the group, and switch between locking and releasing the opening operation of the piston valve 5. On-off valves 77, 78, 79
(Fluid supply switching mechanism) is provided, and these are selected by the controller 80.

That is, when the controller 80 inputs the slap width value W to be descaled, the controller 80 selects a group according to the width.
C ₁ , C ₂ , C ₃ , the opening/closing operation lock for each nozzle group C, and the selection command for releasing this lock, the opening/closing valve 7
7, 78, and 79. For example, in the case of a minimum width slab, by selecting all of the on-off valves 77, 78, and 79 as targets for locking the nozzle opening/closing operation and outputting the lock command signal, high-pressure water from the upper and lower headers 45 and 46 can be Inject only from the injection nozzle group A to the minimum width slab, and in the case of the maximum width slab, select all of the on-off valves 77, 78, 79 as targets for releasing the nozzle opening/closing operation lock and output the release command signal. According to the above
High-pressure water from the lower headers 45 and 46 is injected from the fluid injection nozzle group A and all fluid injection nozzle C groups of groups C ₁ , C ₂ , and C ₃ onto the maximum width slab, and further onto the slab with the maximum width exceeding the minimum width and less than the maximum width. In this case, select the target for locking the nozzle opening/closing operation of the on-off valves 77, 78, and 79 and the target for releasing the lock so that high-pressure water is injected over at least the entire width according to the width of the slab. A command signal is output and high pressure water from the upper and lower headers 45 and 46 is added to the fluid injection nozzle A to group C ₁ or C ₁ and C ₂ or C ₁ and C ₂ and C _3.
The fluid jet nozzle group injects the fluid onto the slab of the corresponding width, thereby minimizing unnecessary jetting of high-pressure water.

Although this embodiment has been described as an example applied to a descaling device, the present invention is not limited to this, and may be applied to a roll cooling injection device. Moreover, the injection nozzle B may be used instead of the injection nozzle C of this example.

[Effects of the Invention] As is clear from the above description, according to the fluid ejecting device of the present invention, the fluid ejecting object is ejected from the nozzle group arranged corresponding to the largest width among the ejecting objects to which fluid is ejected. Depending on the change in the width of the target object, the nozzle group for the necessary opening/closing operation is arbitrarily selected, and only the entire injection range of the object to be injected is used only from the time when the required injection fluid injection starts to the time when it stops. The injection fluid can be reliably injected from the selected nozzle group, and the amount of injection fluid used and the power consumption of the supply pump can be reduced to the necessary minimum, etc., and a great industrial effect can be obtained. It is.

[Brief explanation of the drawing]

Fig. 1 is a front explanatory view showing an example in which fluid injection nozzle A shown in Fig. 2 A, B, and C is combined with fluid injection nozzle C shown in Fig. 4 and applied to a descaling device. Embodiment 1 of the fluid injection nozzle used in the invention is shown in which A is a longitudinal cross-sectional view, B is a cross-sectional view taken from the direction of the arrow A, C is a cross-sectional view taken from the direction of the arrow A, and the third The figure is a longitudinal sectional view showing a second embodiment of the fluid injection nozzle used in the present invention, and FIG. 4 is a longitudinal sectional view showing a third embodiment of the fluid injection nozzle used in the invention. FIG. 5 is an explanatory front view showing an example of a conventional fluid ejecting device. In the figure, 1: fluid inlet, 2: fluid ejection port, 5: piston valve, 6, 6a, 6b: non-jet fluid outlet/inlet, 8: spring mechanism, 9: cylinder, 10: charging chamber.

Claims (1)

[Scope of Claims] 1. A piston valve consisting of a poppet portion and a piston, in which a tip for opening and closing the jet port is provided between a fluid inlet and a fluid jet port, and an inlet/outlet passage for non-jet fluid for the piston valve. a spring mechanism provided in the piston valve to press the tip of the poppet portion against the spout; a gathering portion that communicates with the fluid inlet and the spout and covers at least the poppet portion; and the piston. A plurality of fluid injection nozzles each having a pressure chamber that covers a stepped surface of the fluid injection nozzle, and a fluid inlet of each of the fluid injection nozzles are connected to each other at a predetermined interval, and are arranged along the object to be ejected. A non-jet body entrance/exit passage of a fluid jet nozzle located in a minimum width area of fluid jet to the object to be jetted is opened to the outside air, and a header is provided on both sides of the minimum width area of fluid jet to the object to be jetted. A fluid ejecting device characterized in that a fluid supply pipe having a fluid supply switching mechanism interposed therein is connected to a non-ejected fluid inlet/output path of a fluid ejecting nozzle. 2. The fluid injection device for descaling a steel plate according to claim 1, wherein the object to be injected is a steel plate, and a header is provided in the width direction of the steel plate. 3. The fluid injection device for cooling a rolling roll according to claim 1, wherein the object to be sprayed is a rolling roll, and a header is provided in the axial direction of the rolling roll.