A method for detecting swing angle of swing chute

Abstract

The application discloses a detection method for swing chute swing angle, comprising the following steps: a crankshaft rotates around point A, a swing chute is hinged to point B, and both the points A and B are fixed points; in an initial state, an end of the crankshaft and an upper end of a connecting rod are hinged to point D, a lower end of the connecting rod and the swing chute are hinged to point C, and the four hinged points form a quadrilateral ABCD; after the swing chute moves, the crankshaft and the upper end of the connecting rod are hinged to point E, the lower end of the connecting rod and the swing chute are hinged to point F; the angle value of the crankshaft rotation angle ∠DAE is obtained through an angle detection device; the length of the line segment AF is calculated according to the cosine theorem; the angle value of the angle ∠ABF is calculated according to the cosine theorem in combination with the length of the line segment AF; and the swing angle ∠CBF of the swing chute is calculated, wherein ∠CBF = ∠ABF - ∠ABC. The application solves the problems of low detection precision and time-consuming and laborious detection process in the detection method for the swing chute swing angle in the prior art.

Description

Technical Field

[0001] This application belongs to the field of blast furnace equipment technology, specifically relating to a method for detecting the swing angle of a swing chute. Background Technology

[0002] With advancements in ironmaking technology, blast furnaces are becoming increasingly larger, and the oscillating chute is a crucial component of the tapping channel in medium and large blast furnaces. Due to the increased single-tapping capacity and high molten iron flow velocity, oscillating chutes are used to switch the molten iron between two ladles. After the oscillating chute moves, its oscillation angle data is manually read and recorded using an angle indicator. Mechanical angle indicators are insufficient to meet the demands of automation, digitization, and intelligent development in blast furnace tapping equipment. When manufacturing angle indicator plates for each specification of oscillating chute, the oscillating chute must be assembled, then driven to oscillate in both directions, jogging at 0.5° intervals. These actual oscillation angles are then mapped and recorded onto the angle indicator plate. Therefore, this angle recording method is primitive, and the manufacturing process is time-consuming and labor-intensive. The angle indicator plate is like... Figure 4 As shown. At the same time, this angle recording method has low measurement accuracy, and the detection basis is to measure the actual value at 0.5° intervals, which cannot accurately measure the real-time continuous swing angle value of the swing groove. Summary of the Invention

[0003] This application provides a method for detecting the swing angle of a swing chute, which solves the problems of low detection accuracy and time-consuming and labor-intensive detection processes in existing methods for detecting the swing angle of a swing chute.

[0004] To achieve the above objectives, embodiments of the present invention provide a method for detecting the swing angle of a swing chute, comprising the following steps:

[0005] The output shaft of the geared motor is connected to the crankshaft shaft, the crankshaft rotates around point A, and the swing chute is hinged to point B. Both points A and B are fixed points. An angle detection device is installed on the output shaft of the geared motor.

[0006] In the initial state, the end of the crankshaft and the upper end of the connecting rod are hinged at point D, and the lower end of the connecting rod and the swing chute are hinged at point C. The four hinge points form a quadrilateral ABCD.

[0007] After the oscillating chute moves, the upper end of the crankshaft and connecting rod is hinged at point E, and the lower end of the connecting rod and the oscillating chute is hinged at point F. The four hinge points form a quadrilateral ABFE.

[0008] The value of crankshaft rotation angle ∠DAE is obtained through an angle detection device;

[0009] Divide quadrilateral ABFE into triangle EAF and triangle FAB, and calculate the length of line segment AF using the law of cosines;

[0010] Calculate the value of angle ∠ABF using the law of cosines and the length of line segment AF;

[0011] Calculate the swing angle ∠CBF of the oscillating chute, where ∠CBF = ∠ABF - ∠ABC, and the angle ∠ABC is a constant.

[0012] When the swing angle ∠CBF is positive, the connecting rod moves upward and point B of the swing chute swings upward;

[0013] When the swing angle ∠CBF is negative, the connecting rod moves downward and point B of the swing chute swings downward.

[0014] In one possible implementation, calculating the length of line segment AF according to the law of cosines includes the following steps:

[0015] In triangle EAF, cos∠EAF = (AE) 2 +AF 2 -EF 2 )÷(2*AE*AF)=(L1 2 +X 2 -L4 2 )÷(2*L1*X);

[0016] In triangle FAB, cos∠FAB=(AF 2 +AB 2 -BF 2 )÷(2*AF*AB)=(L2 2 +X 2 -L3 2 )÷(2*L2*X);

[0017] Since ∠DAE=∠EAF-∠DAF=∠EAF-(∠DAC+∠CAF)=∠EAF-(∠DAC+∠CAB-∠FAB)=∠EAF+∠FAB-∠DAC-∠CAB;

[0018] Therefore, ∠DAE=arccos((L1) 2 +X 2 -L4 2 )÷(2*L1*X))+arccos((L2 2 +X 2 -L3 2 )÷(2*L2*X))-∠DAC-∠CAB;

[0019] Wherein, line segment AF = X, line segment AE = constant L1, line segment AB = constant L2, line segment BF = constant L3, line segment EF = constant L4, and angles ∠DAC and ∠CAB are constants.

[0020] In one possible implementation, calculating the angle ∠ABF based on the law of cosines and the length of line segment AF includes the following steps:

[0021] In triangle ABF, cos∠ABF=(AB 2 +BF 2 -AF 2 )÷(2*AB*BF)=(L2 2 +L3 2 -X 2 )÷(2*L2*L3);

[0022] That is, ∠ABF=arccos((L2) 2 +L3 2 -X 2 )÷(2*L2*L3)).

[0023] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0024] This invention provides a method for detecting the swing angle of a swing chute. This invention enables automatic electronic detection of the swing angle of the swing chute, thereby promoting the automation, digitalization, and intelligentization of the swing chute and blast furnace tapping equipment. It also reduces the labor intensity of furnace operators. The angle detection device uses a rotary encoder, which can accurately measure the rotation angle of the crankshaft with an accuracy higher than one ten-thousandth. This invention utilizes the trigonometric function relationship of the triangle formed by the hinge point and the fixed point to measure the angle of the swing chute. The measurement accuracy is very high, as the angle of the swing chute is calculated using trigonometric functions; therefore, the accuracy of the swing chute angle is equivalent to the accuracy of the crankshaft rotation angle. The measurement results are displayed on a display device. The sign of the swing angle can also determine the swing direction of the swing chute. Therefore, the method of this invention is highly reliable, practical, and easy to promote and use. This invention's method enables automatic and continuous detection of the swing angle. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart of a method for detecting the swing angle of a swing chute, provided in an embodiment of the present invention.

[0027] Figure 2This is a schematic diagram of the upward motion of the connecting rod provided in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the link moving downwards, provided in an embodiment of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of an angle indicator dial in the prior art.

[0030] Reference numerals: 1-connecting rod; 2-crankshaft; 3-oscillating chute. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0033] like Figures 1 to 3 As shown, the method for detecting the swing angle of a swing chute provided in this embodiment of the invention includes the following steps:

[0034] The output shaft of the geared motor is connected to the rotating shaft of crankshaft 2, which rotates around point A. The swing chute 3 is hinged to point B, and both points A and B are fixed points. An angle detection device is installed on the output shaft of the geared motor.

[0035] In the initial state, the end of crankshaft 2 and the upper end of connecting rod 1 are hinged at point D, and the lower end of connecting rod 1 and the swing chute 3 are hinged at point C. The four hinge points form a quadrilateral ABCD.

[0036] The geared motor is started, and it drives the connecting rod 1 through the crankshaft 2. After the connecting rod 1 drives the swing chute 3, the upper ends of the crankshaft 2 and the connecting rod 1 are hinged at point E, and the lower end of the connecting rod 1 and the swing chute 3 are hinged at point F. The four hinge points form quadrilateral ABFE. Quadrilateral ABFE and quadrilateral ABCD are located in the same plane, and this plane is perpendicular to the axis of rotation of the crankshaft 2, thus ensuring the accuracy of the calculated angles.

[0037] The two ends of the connecting rod 1 are hinged to the crankshaft 2 and the swing chute 3 respectively. The hinge points at both ends of the connecting rod 1 are movable points. After the connecting rod 1 moves, the hinge points at both ends of the connecting rod 1 change in spatial position. The upper hinge point of the connecting rod 1 moves from point D to point E, and the lower hinge point of the connecting rod 1 moves from point C to point F.

[0038] The value of the crankshaft 2 rotation angle ∠DAE is obtained by an angle detection device.

[0039] Divide quadrilateral ABFE into triangles EAF and FAB, and calculate the length of line segment AF using the law of cosines.

[0040] The value of angle ∠ABF can be calculated using the law of cosines and the length of line segment AF.

[0041] Calculate the swing angle ∠CBF of the swing chute 3, where ∠CBF = ∠ABF - ∠ABC, and the angle ∠ABC is a constant.

[0042] When the swing angle ∠CBF is positive, connecting rod 1 moves upward, and point B of the swing chute 3 swings upward. The swing chute 3 tilts to the right.

[0043] When the swing angle ∠CBF is negative, the connecting rod 1 moves downward, point B of the swing chute 3 swings downward, and the swing chute 3 tilts to the left.

[0044] In this embodiment, calculating the length of line segment AF according to the law of cosines includes the following steps:

[0045] In triangle EAF, cos∠EAF = (AE) 2 +AF 2 -EF 2 )÷(2*AE*AF)=(L1 2 +X 2 -L4 2 )÷(2*L1*X).

[0046] In triangle FAB, cos∠FAB=(AF 2 +AB 2 -BF 2 )÷(2*AF*AB)=(L2 2 +X 2 -L32 )÷(2*L2*X).

[0047] Since ∠DAE=∠EAF-∠DAF=∠EAF-(∠DAC+∠CAF)=∠EAF-(∠DAC+∠CAB-∠FAB)=∠EAF+∠FAB-∠DAC-∠CAB.

[0048] Therefore, ∠DAE=arccos((L1) 2 +X 2 -L4 2 )÷(2*L1*X))+arccos((L2 2 +X 2 -L3 2 )÷(2*L2*X))-∠DAC-∠CAB. This formula has only one unknown, therefore the size of line segment AF can be directly obtained through calculation.

[0049] Wherein, line segment AF = X, line segment AE = constant L1, line segment AB = constant L2, line segment BF = constant L3, line segment EF = constant L4, and angles ∠DAC and ∠CAB are constants.

[0050] In this embodiment, calculating the angle ∠ABF based on the law of cosines and the length of line segment AF includes the following steps:

[0051] In triangle ABF, cos∠ABF=(AB 2 +BF 2 -AF 2 )÷(2*AB*BF)=(L2 2 +L3 2 -X 2 )÷(2*L2*L3).

[0052] That is, ∠ABF=arccos((L2) 2 +L3 2 -X 2 )÷(2*L2*L3)).

[0053] In this embodiment, L1 = 380mm, L2 = 5567.82mm, L3 = 1000mm, L4 = 5348mm, ∠DAC = 77.63 degrees, ∠CAB = 10.33 degrees, and ∠CBA = 76.16 degrees.

[0054] This invention enables automatic electronic detection of the swing angle of the swing chute 3, thereby improving the automation, digitalization, and intelligence of the swing chute 3 and the blast furnace tapping area equipment. It also reduces the workload of furnace operators.

[0055] This invention utilizes the trigonometric relationships of the triangle formed by the hinge point and the fixed point to measure the angle of the swing chute 3. The measurement accuracy is very high, as the angle of the swing chute 3 is calculated using trigonometric functions. Therefore, the accuracy of the angle of the swing chute 3 is equivalent to the accuracy of the rotation angle of the crankshaft 2. The measurement results are displayed on a display device. The sign of the swing angle can also determine the swing direction of the swing chute 3. Therefore, the method of this invention is highly reliable, practical, and easy to promote and use. This invention's method can achieve automatic and continuous detection of the swing angle. The calculation process of this invention is simple, so a small central processing unit is sufficient to meet the usage requirements. Therefore, the processing system involved in this invention has the characteristics of small size, low cost, and strong adaptability. The angle detection device uses a rotary encoder, which can accurately measure the rotation angle of the crankshaft 2 with an accuracy higher than one ten-thousandth.

[0056] In this embodiment, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the present invention.

Claims

1. A method for detecting a swing angle of a swing chute, characterized by, The method comprises the following steps: The output shaft of the speed reducer motor is connected to the rotating shaft of the crankshaft (2), the crankshaft (2) rotates around point A, the swing chute (3) is hinged to point B, and points A and B are both fixed points, and point A is located obliquely above point B; an angle detection device is arranged on the output shaft of the speed reducer motor; In the initial state, the end of the crankshaft (2) and the upper end of the connecting rod (1) are hinged to point D, the lower end of the connecting rod (1) and the swing chute (3) are hinged to point C, the four hinge points form a quadrilateral ABCD, the hinge points at the two ends of the connecting rod (1) are movable points, and the connecting rod (1) is located on the side away from the center of the swing chute (3) of points A and B; The speed reducer motor is controlled to start, the speed reducer motor drives the connecting rod (1) to move through the crankshaft (2), after the connecting rod (1) drives the swing chute (3) to move, the crankshaft (2) and the upper end of the connecting rod (1) are hinged to point E, the lower end of the connecting rod (1) and the swing chute (3) are hinged to point F, and the four hinge points form a quadrilateral ABFE; the quadrilateral ABFE and the quadrilateral ABCD are located in the same plane, and the plane is perpendicular to the rotating shaft of the crankshaft (2); The numerical value of the rotation angle ∠DAE of the crankshaft (2) is obtained through the angle detection device; The quadrilateral ABFE is divided into a triangle EAF and a triangle FAB, and the length of the line segment AF is calculated according to the cosine theorem; The numerical value of the angle ∠ABF is calculated according to the cosine theorem combined with the length of the line segment AF; The swing angle ∠CBF of the swing chute (3) is calculated, and ∠CBF = ∠ABF - ∠ABC, wherein the angle ∠ABC is a constant; When the swing angle ∠CBF is positive, the connecting rod (1) moves upward, and the B point of the swing chute (3) swings upward; When the swing angle ∠CBF is negative, the connecting rod (1) moves downward, and the B point of the swing chute (3) swings downward.

2. The method for detecting a swing angle of a swing chute according to claim 1, wherein The length of the line segment AF is calculated according to the cosine theorem, which comprises the following steps: In triangle EAF, COS ∠EAF = (AE 2 + AF 2 - EF 2 ) ÷ (2*AE*AF) = (L1 2 + X 2 - L4 2 ) ÷ (2*L1*X); In triangle FAB, COS ∠FAB = (AF 2 + AB 2 - BF 2 ) ÷ (2*AF*AB) = (L2 2 + X 2 - L3 2 ) ÷ (2*L2*X); Since ∠DAE = ∠EAF - ∠DAF = ∠EAF - (∠DAC + ∠CAF) = ∠EAF + ∠FAB - ∠DAC - ∠CAB; Thus, ∠DAE = arccos ((L1 2 + X 2 - L4 2 ) ÷ (2*L1*X)) + arccos ((L2 2 + X 2 - L3 2 ) ÷ (2*L2*X)) - ∠DAC - ∠CAB; Wherein, the line segment AF = X, the line segment AE = a constant L1, the line segment AB = a constant L2, the line segment BF = a constant L3, the line segment EF = a constant L4, and the angles ∠DAC and ∠CAB are both constants.

3. The method for detecting a swing angle of a swing chute according to claim 2, wherein The angle ∠ABF is calculated according to the cosine theorem combined with the length of the line segment AF, which comprises the following steps: In triangle ABF, COS ∠ABF = (AB 2 +BF 2 -AF 2 ) ÷ (2*AB*BF) = (L2 2 +L3 2 -X 2 ) ÷ (2*L2*L3); That is, ∠ABF = arccos((L2 2 +L3 2 -X 2 ) ÷ (2*L2*L3)).

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