Device and method for continuously measuring flow rate near liquid steel surface

Patent metadata

Field	Value
Publication number	US-9630242-B2
Application number	US-201314646040-A
Country	US
Kind code	B2
Filing date	Mar 20, 2013
Priority date	Nov 26, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

A device for continuously measuring the flow rate of steel melt near surface thereof, comprising a flow rate detecting rod ( 18 ) and a deflection means (B) for the flow rate detecting rod, wherein the flow rate detecting rod ( 18 ) comprises a refractory material tube at one end and a stainless steel rod at the other end, and the stainless steel rod is fittedly connected with the refractory material tube. Also provided is a method for continuously measuring the flow rate of steel melt near surface thereof.

First claim

What is claimed is:

1. A device for continuously measuring the flow rate of steel melt near the surface thereof, the device comprising:
a flow rate detecting rod comprising a refractory material tube at one end and a stainless steel rod at an opposing end, wherein the stainless steel rod is fittedly connected with the refractory material tube;
wherein the flow rate detecting rod comprises a refractory material of a single compound selected from the group consisting of Al 2 O 3 , MgO, SiO 2 , CaO, ZrO 2 , SiC or of a composite of two or more of a compound selected from the group consisting of Al 2 O 3 , MgO, SiO 2 , CaO, ZrO 2 , SiC;
wherein the flow rate detecting rod has a length of 10-100 cm and a diameter of 5-50 mm; and
a deflection device for the flow rate detecting rod, comprising a fastening screw for the flow rate detecting rod, wherein the flow rate detecting rod is fixed to the deflection device by the fastening screw for the flow rate detecting rod;
the deflection device comprising a flow rate detecting rod counterweight, a deflection bearing sleeve, a deflection bearing, a deflection angle indicating board, a deflection angle pointer and the fastening screw for the flow rate detecting rod;
wherein both the deflection bearing sleeve and the deflection bearing are circular, and the deflection bearing is slidably set against an inner wall of the deflection bearing sleeve;
wherein the outer surface of the deflection bearing sleeve comprises a counterweight rod extending outward, wherein the counterweight rod and the fastening screw for the flow rate detecting rod are fixed to the outer surface of the deflection bearing sleeve respectively and spaced by 180 degrees, and the flow rate detecting rod counterweight is fixed to the counterweight rod;
the deflection angle indicating board has a shape of sector, wherein the vertex of the sector is fixed to an end face of the deflection bearing, and the surface of the arc of the sector comprises scales;
the deflection angle pointer is fixed to the vertex of the sector at one end, and the other end points to the scales on the arc of the sector, wherein the deflection angle pointer is parallel to the flow rate detecting rod, and rotates as the flow rate detecting rod rotates; and
the flow rate detecting rod is fixed to the outer surface of the deflection bearing sleeve using the fastening screw for the flow rate detecting rod.

2. The device of claim 1 , wherein the flow rate detecting rod counterweight comprises an upper fastening screw, a balancing disc and a lower fastening screw; and the balancing disc is a circular counterweight disc set around the counterweight rod, wherein the upper and lower fastening screws are fixed to the counterweight rod from the upper and lower sides respectively, limiting the position of the balancing disc.

3. The device of claim 1 , further comprising supports of the flow rate measuring device, a support base and leveling screws, wherein four supports of the flow rate measuring device are fixed vertically to the upper surface of the support base, and four underlying feet extend from the lower surface of the support base in four directions respectively, wherein a leveling screw is arranged vertically on each underlying foot, and the leveling screw is adjustable in the vertical direction.

4. The device of claim 3 , further comprising an up-down movement element for the flow rate detecting rod, wherein the up-down movement element comprises a moving rail, moving pulleys, a moving support plate, fastening screws for the moving support plate, a position fixing element and a connecting rod for fixing position;
wherein the moving rail is arranged on the support of the flow rate measuring device; four moving pulleys are arranged on the moving support plate, and fixed to the lower surface of the support plate using the fastening screws for the moving support plate which penetrate through the upper and lower surfaces of the support plate; and the moving pulleys are inset in the moving rail; and
wherein the position fixing element is set on the support of the flow rate measuring device, and the moving support plate and the position fixing element are connected by the connecting rod for fixing position.

5. The device of claim 4 , further comprising
a horizontal support rod and a support rod fastening screw,
wherein the horizontal support rod is arranged horizontally, one end of which is connected to the up-down movement element for the flow rate detecting rod, and the other end of which is inserted into the circular ring of the deflection bearing, wherein the support rod fastening screw is arranged at the top of the horizontal support rod, tightly close to an end face of the deflection bearing.

6. A method for continuously measuring the flow rate of steel melt near the surface thereof by using the device of claim 1 , the method comprising the following steps:
a) determining a barycenter of the flow rate detecting rod, a rotational pivot of the flow rate detecting rod and an acting point of an impact force on the flow rate detecting rod;
b) calculating the distance between the rotational pivot and the barycenter, and the distance between the rotational pivot and the acting point of the impact force;
c) measuring gravity value of the flow rate detecting rod;
d) baking the flow rate detecting rod at a high temperature in the range of 1000-1500° C. for about 10 min;
e) inserting the baked flow rate detecting rod into the steel melt to obtain a rotational angle and an insertion depth;
f) collecting continuous and average values of the rotational angle in a period of time;
g) calculating the impact force of the steel melt;
h) measuring continuous and average values of the projection area of the flow rate detecting rod in a direction perpendicular to the flowing direction of the steel melt, density of the steel melt and drag force coefficient;
i) calculating the peak value, the average value and the continuous values of the flow rate of the steel melt based on the continuous and average values of the rotational angle, the projection area, the density of the steel melt and the drag force coefficient; and
j) estimating the flow rate of the steel melt based on the peak value, the average value and the continuous values of the flow rate of the steel melt.

7. The method of claim 6 , wherein the flow rate detecting rod is inserted into the flowing steel melt and is subjected to the action of gravity and the impact force of the flowing steel melt; when the flow rate detecting rod deflects to a certain angle and reaches a balance state, the moment generated by the gravity and the moment generated by the impact force of the flowing steel melt arrives at equilibrium.

8. The method of claim 6 , wherein step a) further comprises setting a flow rate detecting rod counterweight to adjust the barycenter of the flow rate detecting rod to a position close to the rotational pivot of the flow rate detecting rod, such that the flow rate detecting rod and the counterweight are substantially in a state of gravity balance.

Assignees

• Baoshan Iron & Steel

Inventors

• Yang Jian
• Zhi Jianjun
• Zhu Kai
• Zhu Jianhua
• Fan Zhengjie
• Wang Ruizhi

Classifications

• G01F1/28

  by drag-force, e.g. vane type or impact flowmeter · CPC title

• G01P5/06

  using rotation of vanes (measuring speed of rotating shafts G01P3/00) · CPC title

• B22D11/16

  Controlling or regulating processes or operations · CPC title

• B22D2/00 Primary

  Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass · CPC title

• G01P5/04

  using deflection of baffle-plates · CPC title