Method for arranging jet cleaning nozzles

Abstract

A method for arranging jet cleaning nozzles comprising: arranging multiple rows of nozzles in a parallel and uniform manner along a lengthwise direction of a metal plate strip; arranging the nozzles in each row at an equal interval; arraying adjacent rows of nozzles in a staggered manner along the widthwise direction of the metal plate strip so as to form a nozzle matrix; wherein each nozzle is perpendicular to a moving direction of the metal plate strip, and the perpendicular distance of each nozzle to a surface of the metal plate strip is the same. Through the method for arranging jet cleaning nozzles, nozzles can be flexibly controlled based on the change of the geometric relationship between nozzles, in order to implement efficient and continuous descaling on the surfaces of a metal plate strip with different width specifications and different requirements on the descaling speed. In this way, waste of energy and water resources occurred when changing specifications is avoided, and the phenomenon that upper and lower nozzles spray to each other is also avoided, thereby achieving flexible and efficient control over the arrangement mode of jet cleaning nozzles for descaling.

Claims

1. A method for arranging jet cleaning nozzles comprising: arranging multiple rows of the jet cleaning nozzles in parallel along a lengthwise direction of a metal plate strip; arranging the jet cleaning nozzles in each of the multiple rows of the jet cleaning nozzles at an equal interval; arraying two adjacent rows of the multiple rows of the jet cleaning nozzles in a staggered manner along a widthwise direction of the metal plate strip so as to form a nozzle matrix, wherein each of the jet cleaning nozzles is perpendicular to a moving direction of the metal plate strip, and a perpendicular distance of each jet cleaning nozzle to a surface of the metal plate strip is the same, wherein when a width of the metal plate strip in a production line changes and produces a metal plate strip of a certain target width in a width range of cleaning, in order to assure that all jet cleaning nozzles can conduct efficient descaling to the metal plate strip, the jet cleaning nozzles comprises following adjustment: in a vertical direction of the surface of the metal plate strip, that is namely a Z direction, setting a moving distance as c; setting a direction moving close to the metal plate strip as a negative movement, wherein a value of Ac is a negative value; setting a direction moving away from the surface of the metal plate strip as a positive movement, a value of Ac is a positive value; wherein the following formula is satisfied:
c={[(L.sub.1L.sub.0)ctg]/n}.Math.(1+K) wherein: L.sub.0a basic width value of the metal plate strip, mm, L.sub.1 an adjusting target width value of the metal plate strip, mm, a unilateral divergence angle of jet flow symmetric section of the jet cleaning nozzle, which is determined by a property of the jet cleaning nozzle, degree; nthe number of jet cleaning nozzles of two adjacent rows; Ka compensation coefficient of a jet flow characteristic of the jet cleaning nozzles 0.50; in the widthwise direction of the metal plate strip i.e. an X direction, each row of the jet cleaning nozzles has a central line of the plate width as a symmetry center, and when the jet cleaning nozzles move close to the center line of the plate width, a distance between adjacent two jet cleaning nozzles in each row changes with a variation 2a, which is satisfied by:
a=(L.sub.1L.sub.0)/(n1).

2. The method for arranging jet cleaning nozzles according to claim 1, wherein jet flows of adjacent jet cleaning nozzles in a same row have no mutual interference.

3. The method for arranging jet cleaning nozzles according to claim 1 or 2, wherein in the lengthwise direction of the metal plate strip, jet flows of adjacent rows of jet cleaning nozzles have no mutual interference.

4. The method for arranging jet cleaning nozzles according to claim 1, wherein in the widthwise direction of the metal plate strip, that is the X direction, a separation distance between jet cleaning nozzles in each row is 2a; and a separation distance between nozzles from two adjacent rows of nozzles in the widthwise direction of the metal plate strip is a.

5. The method for arranging jet cleaning nozzles according to claim 1, wherein in the moving direction of the metal plate strip, that is a Y direction, a separation distance between two adjacent rows of jet cleaning nozzles is b, and a value of b satisfies non-mutual interference between jet flows of two adjacent rows of nozzles.

6. The method for arranging jet cleaning nozzles according to claim 1, wherein the jet cleaning nozzles in each row are arranged parallel in more than one or more columns along the lengthwise direction of the metal plate strip, so as to form longitudinal nozzle columns which can he adjusted respectively.

7. The method for arranging jet cleaning nozzles according to ally on of claim 1, wherein a jet flow divergence angle of each jet cleaning nozzle is: 0<<45.

8. The method for arranging jet cleaning nozzles according to claim 1, wherein an axis of the jet cleaning nozzle is in a plane which is parallel to the moving direction of the metal plate strip and vertical to the surface of the metal plate strip; and an angle is between the axis of the jet cleaning nozzle and a vertical line of the metal plate strip, of which the value range is 0<<50.

9. The method for arranging jet cleaning nozzles according to claim 1, wherein two different kinds of mediums pass through the jet cleaning nozzles simultaneously, a first medium is liquid water, and a second medium is hard particles.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a top view illustrating the nozzle arrangement in the embodiment of cleaning metal plate strip of wide specification according to the method of present invention.

(2) FIG. 2 is a side view illustrating the nozzle arrangement in the embodiment of cleaning metal plate strip of wide specification according to the method of present invention.

(3) FIG. 3 is a view illustrating the distribution of the nozzle spray strength in the embodiment of cleaning metal plate strip of wide specification according to the method of present invention.

(4) FIG. 4 is a parameter diagram of the nozzle arrangement when cleaning metal plate strip of narrow specification according to the method of present invention.

(5) FIG. 5 is a parameter diagram of the nozzle arrangement when cleaning metal plate strip of narrow specification according to the method of present invention.

(6) FIG. 6 is a distribution diagram of the nozzle spray strength when cleaning metal plate strip of narrow specification according to the method of present invention.

(7) FIG. 7 is a structure diagram between the nozzle and the metal plate strip according to the method of present invention.

EMBODIMENTS

(8) A method for arranging jet cleaning nozzles according to the present invention, as shown in FIGS. 1-3, multiple rows of nozzles are in a parallel manner and uniformly arranged along the lengthwise direction of a metal plate strip 1. In the present embodiment, each nozzle 21, 22 or 31, 32 in the first row of nozzles 2 and the second row of nozzles 3 are arranged at an equal interval. Two adjacent rows of nozzles are arrayed in a staggered manner along the widthwise direction of the metal plate strip 1 so as to form a nozzle matrix. Each nozzle is perpendicular to a moving direction of the metal plate strip 1. The perpendicular distance of nozzles 21, 22, 31, 32 to the surface of the metal plate strip 1 is same.

(9) Preferably, mutual interference between jet flows of adjacent nozzles 21, 22 or 31, 32 in the same row does not happen; and mutual interference between jet flows of two adjacent rows of nozzles 2, 3 does not happen in a lengthwise direction (Y direction) of the metal plate strip 1, namely that is, between two adjacent nozzles 21, 32.

(10) In the widthwise direction of the metal plate strip 1, that is namely the X direction, a separation distance between nozzles 21, 22 in each row is 2a; the a separation distance of nozzles 21, 32 from two adjacent rows of nozzles 2, 3 is a.

(11) Hereby cite the scale skin removal of the cold state hot-rolled steel sheet surface as an example, of which the embodiments are as follows:

(12) A spray pressure of the nozzle is set at 3080 MPa, and a flow rate of each nozzle is at a level of 10 L/min60 L/min.

(13) Regarding to a cleaning for a strip steel with a width of 1000 mm, the first row of nozzles need to be arranged with 10 nozzles, the second row of nozzles also need to be arranged with 10 nozzles, and a offset distance between two nozzles is 50 mm; a spray distance Z of the nozzle is kept at a level of 120 mm to spray.

(14) A jet flow divergence angle of each nozzle is 30, of which the strength distribution obeys the normal distribution rule, as shown in the FIG. 3. Wherein, S1 is the strength of the first row of nozzles, S2 is the strength of the second row of nozzles, and S0 is a strength distribution after overlapping two rows of nozzles. By such arrangement and adjusting manner of the nozzle matrix, a fast switching to a steel plate of another width can be realized after descaling of a whole surface of the steel plate of one certain width, and the descaling of a whole surface of the steel plate after switching can also be realized, which will greatly enhance the service efficiency of each nozzle and eliminate the waste of useless jet flow spray and other phenomenon.

(15) As shown in FIGS. 4-6, when the width value of the strip steel being in cleaning is switched from original 1000 mm to 500 mm, a variation rules of the a, b, c value of each nozzle are as follows:

(16) $c=\left\{\left[\left(500-1000\right)\mathrm{ctg}15\right]/20\right\}.Math.\left(1+K\right)$$c=-75\mathrm{mm}$

(17) in the formula: Ka jet flow influence coefficient of a nozzle, just take 0.2.

(18) At the moment, a spray target distance of a nozzle of narrow specification is changed into:
c=12075=45 mm

(19) Similarly, it can be calculated that the value of a, b after adjustment is:

(20) $a=\frac{1}{2}.Math.\left[\left(500-1000\right)/\left(10-1\right)\right]=-27.78\mathrm{mm}$$b=0\mathrm{mm}$

(21) In this way, it is realized that the nozzle matrix unit is switched from a cleaning manner of 1000 mm to a cleaning manner of 500 mm During this period, there is no need to conduct any adjustment to the pressurized system, pipeline and so on, which greatly enhances the technical control ability and improves the production efficiency.

(22) As shown in FIG. 1, said nozzles in each row are arranged in a parallel manner in more than one column along the lengthwise direction of the metal plate strip 1 (Y direction), so as to form a longitudinal nozzle unit 4 which can be adjusted individually.

(23) As shown in FIG. 7, a axis of said jet nozzle 21 (citing the jet nozzle 21 as an example, other are the same) is AB line, and a direction of the jet flow is: from A to B; the direction of the jet flow AB within a plane ACEF parallel to a strip moving direction of the strip steel (the metal plate strip 1) and vertical to the surface of the metal plate strip; and there is an included angle between the axis of the nozzle 21 (AB line) and a vertical line AC of the metal plate strip 1, of which the value range is 0<<50.

(24) The present invention fully uses the jet flow characteristic and the strength distribution characteristic of the nozzle, so as to realize a swift adjustment of the nozzle matrix when cleaning the metal strip plate surface. Especially, it can enhance the surface cleaning efficiency of the metal strip plate, decrease unnecessary loss of energy and greatly reduce abnormal damage of partial device. Therefore, the present invention has wide application prospect in the field of surface descaling technology. The present invention is not only adapted to the surface descaling and rust removal of cold state metal strip plate, but also can be applied to technical field of coating, nozzle cooling, spray lubrication, etc.