Device and method for measuring resistance of spherical furnace burden

Abstract

The invention relates to a device and method for measuring the resistance of a spherical furnace burden, and belongs to the technical field of metallurgical production. The device comprises an insulating shell and a furnace charge placing cavity arranged in the shell and used for accommodating a furnace charge to be detected. An opening is formed in the top side of the furnace charge containing cavity and is closed through an adjusting plate in sliding fit with the insulating shell, and a first contact pin and a second contact pin are installed on the adjusting plate. Four upright posts are arranged at the bottom of the placing cavity, two upright posts are insulators, and the other two upright posts are a third contact pin and a fourth contact pin which are made of conductors. The first contact pin and the third contact pin are connected with a voltmeter through wires to form a voltage loop. The second contact pin and the fourth contact pin are connected with the ammeter through wires to form a current loop. The method comprises the following steps: placing a spherical furnace charge in an insulating shell, adjusting the contact position of a contact pin and the furnace charge, supplying power by using a constant-current power supply, recording voltage and current values, and calculating the contact resistance according to R = U / I. The device effectively reduces the influence of wire resistance and contact resistance on a measurement result, improves the accuracy of low-resistance measurement, and is suitable for spherical furnace charges with different particle sizes and components, including waste steel, direct reduction iron and the like. The sliding design of the adjusting plate simplifies the operation process and improves the test efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical production, and relates to a device and a method for measuring the resistance of spherical furnace charge. Background Art

[0002] Electric furnace smelting is a method of smelting by heating the charge using the thermal effect of an electric arc. Alternating current is input into the furnace through graphite electrodes, generating an arc between the lower end of the electrode and the metal material. The high temperature of the arc is used to directly heat the charge, allowing the smelting process to proceed. The raw materials for electric furnace smelting mainly include scrap steel and direct reduced iron, of which scrap steel usually accounts for more than 50%, while the proportion of direct reduced iron is generally 30-50%. Resistance is a physical quantity that measures the electrical conductivity of a material. For electric furnace smelting, if there is a large difference in the resistance value of the charge, it will not only affect the uniformity of the temperature in the furnace, but also lead to reduced product quality and production efficiency. In addition to the resistance of the charge itself, the change in resistance value caused by contact between the charges will also directly affect the efficiency of converting electrical energy into thermal energy, which is crucial for electric furnace smelting.

[0003] Take direct reduced iron as an example. The Fe content in direct reduced iron is high and the resistance value is low. In order to reduce the error caused by the wire resistance during the measurement process, it is suitable to use the four-wire method (four-terminal method) to measure its resistance. The four-wire method is mainly used to accurately measure low-value resistance. Its principle is that the constant current power supply supplies current to the low-value resistance to be measured, and the voltage is measured through two voltage leads. The potential difference formed by the current supplied by the constant current power supply on the low-value resistance to be measured, and the resistance value is obtained by the ratio of voltage and current.

[0004] The existing four-wire method test device usually uses a fixture to fix the sample. It is difficult to directly measure the resistance of spherical furnace materials such as reduced iron when they are in contact with each other using the existing four-wire method test device, and a test device needs to be designed. Summary of the invention

[0005] In view of this, the purpose of the present invention is to solve the problem of measuring the contact resistance of spherical charge materials, and to provide a device and method for measuring the resistance of spherical charge materials.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A device for measuring the resistance of a spherical charge, comprising an insulating shell, wherein a charge placement cavity is provided in the insulating shell for placing the charge of the resistance to be measured; an opening is provided on the top side of the charge placement cavity, an adjustment plate is provided on the opening, and the adjustment plate is slidably matched with the insulating shell; a first contact pin and a second contact pin are provided on the adjustment plate;

[0008] Four columns are fixedly provided at the bottom of the charge placement chamber, two of which are insulators, and the other two are third and fourth contact pins made of conductors;

[0009] The first contact pin and the third contact pin are respectively connected to a voltmeter through wires to form a voltage loop; the second contact pin and the fourth contact pin are respectively connected to an ammeter through wires to form a current reflux; the charge is placed on the top of the four columns, and the first contact pin, the second contact pin, the third contact pin, and the fourth contact pin are simultaneously in contact with the surface of the charge by moving the adjustment plate, thereby forming a four-wire method for measuring the contact resistance of the charge.

[0010] Furthermore, the insulating shell and the adjusting plate are both insulators.

[0011] Furthermore, the four columns are arranged in a square shape, the first contact pin is directly opposite to the third contact pin, and the second contact pin is directly opposite to the fourth contact pin. Furthermore, the insulating shell is cylindrical, and the adjustment plate is disc-shaped.

[0012] A method for measuring the resistance of a spherical furnace charge, using the device for measuring the resistance of a spherical furnace charge as described above to measure the resistance of the spherical furnace charge, comprises the following steps:

[0013] (1) placing the spherical charge in the insulating shell and on the top of the four pillars, and making the spherical charge contact the third contact pin and the fourth contact pin;

[0014] (2) placing an adjustment plate above the spherical charge and adjusting the position of the adjustment plate so that the first contact pin and the second contact pin are in contact with the charge;

[0015] (3) The first contact pin and the third contact pin are connected to a voltmeter through wires, and the second contact pin and the fourth contact pin are connected to an ammeter through wires. After a constant current power supply supplies current to the device, the values ​​of the ammeter and the voltmeter are recorded and recorded as I and U, respectively.

[0016] (4) The resistance of the spherical charge is obtained according to the formula R=U / I.

[0017] Furthermore, the method is used to measure the electrical resistance of spherical furnace charges of different particle sizes when in contact.

[0018] Furthermore, the method is used to measure the electrical resistance of spherical furnace materials with the same particle size and different compositions when they are in contact.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention adopts the "four-wire method (four-terminal method)" to measure resistance, effectively eliminating the influence of wire resistance and contact resistance on the measurement results, and improving the accuracy of low resistance measurement. By arranging four contact pins, the voltmeter and the ammeter are independently connected, ensuring the separation of constant current input and voltage measurement, avoiding the error superposition problem of the traditional two-wire measurement method.

[0021] 2. This device is suitable for measuring the contact resistance between spherical furnace materials of different particle sizes or different compositions, covering various metallurgical raw materials, such as scrap steel, direct reduced iron, etc., to meet the needs of different production scenarios. For furnace materials with low resistance values ​​such as direct reduced iron, the four-wire method is used for accurate measurement, overcoming the defect of insufficient test accuracy of traditional devices in low resistance environments.

[0022] 3. The adjustment plate in the present invention can be slidably adjusted along the insulating shell, which is convenient for finding the two ends of the diameter of the contacting spherical charge, and can reduce errors when repeating the test; by adjusting the position of the adjustment plate, the contact pin can quickly contact the surface of the spherical charge, which simplifies the complex test preparation process and improves operating efficiency.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 It is an overall schematic diagram of the device for measuring the resistance of spherical furnace charge in the present invention.

[0026] Figure 2 It is a schematic diagram of the insulating shell in the present invention.

[0027] Figure 3 It is a schematic diagram of the adjustment plate in the present invention.

[0028] Figure numerals: 1-conductor wire; 2-conductor wire; 3-conductor wire; 4-conductor wire; 5-insulating shell; 6-adjusting plate; 7-fourth contact pin; 8-third contact pin; 9-column; 10-column. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] See also Figures 1 to 3 , is a device for measuring the resistance of a spherical charge, comprising an insulating shell 5, wherein a charge placement cavity is provided in the insulating shell 5 for placing the charge of the resistance to be measured; an opening is provided on the top side of the charge placement cavity, an adjustment plate 6 is provided on the opening, and the adjustment plate 6 is slidably matched with the insulating shell 5; a first contact pin and a second contact pin are provided on the adjustment plate 6;

[0033] Four columns are fixedly arranged at the bottom of the charge placement chamber, of which columns 9 and 10 are insulators, and the other two columns are the third contact pin 8 and the fourth contact pin 7 made of conductors;

[0034] The first contact pin is connected to the voltmeter through the wire 4, and the third contact pin 8 is connected to the voltmeter through the wire 3 to form a voltage loop; the second contact pin is connected to the ammeter through the wire 1, and the fourth contact pin is connected to the ammeter through the wire 2 to form a current reflux; the charge is placed on the top of the four columns, and the first contact pin, the second contact pin, the third contact pin, and the fourth contact pin are made to contact with the surface of the charge at the same time by moving the adjustment plate, thereby forming a four-wire method for measuring the contact resistance of the charge.

[0035] The insulating shell and the adjusting plate are both insulators. The four uprights are arranged in a square shape, the first contact pin is directly opposite to the third contact pin, the second contact pin is directly opposite to the fourth contact pin, the insulating shell is cylindrical, and the adjusting plate is in a circular plate shape.

[0036] This device can be used to test the resistance of spherical furnace charges with different particle sizes when in contact. It can also be used to test the resistance of spherical furnace charges with the same particle size but different components when in contact.

[0037] A method for measuring the resistance of a spherical furnace charge, using the device for measuring the resistance of a spherical furnace charge in this embodiment to perform the measurement, comprises the following steps:

[0038] (1) placing the spherical charge in the insulating shell 5 and on top of the third contact pin 8, the fourth contact pin 7, the column 9 and the column 10, so that the spherical charge is in contact with the third contact pin 8, the fourth contact pin 7, the column 9 and the column 10;

[0039] (2) placing the adjusting plate 6 above the charge and adjusting the position of the adjusting plate 6 so that the first contact pin and the second contact pin are in contact with the charge;

[0040] (3) Wires 1 and 2 are connected to an ammeter, and wires 3 and 4 are connected to a voltmeter. After a constant current power supply supplies current to the device, the values ​​of the ammeter and voltmeter are recorded and recorded as I and U, respectively.

[0041] (4) The resistance of the spherical charge is obtained according to the formula R=U / I.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A device for measuring the resistance of spherical charge, characterized in that: It comprises an insulating shell, wherein a charge placement cavity is provided in the insulating shell for placing charge of the resistor to be measured; an opening is provided on the top side of the charge placement cavity, an adjustment plate is provided on the opening, and the adjustment plate is slidably matched with the insulating shell; and a first contact pin and a second contact pin are provided on the adjustment plate; Four columns are fixedly provided at the bottom of the charge placement chamber, two of which are insulators, and the other two are third and fourth contact pins made of conductors; The first contact pin and the third contact pin are connected to a voltmeter through wires to form a voltage loop; the second contact pin and the fourth contact pin are connected to an ammeter through wires to form a current return; The charge is placed on the top of four columns, and the first, second, third and fourth contact pins are brought into contact with the charge surface at the same time by moving the adjustment plate, thereby forming a four-wire method for measuring the charge contact resistance.

2. The device for measuring the resistance of spherical charge according to claim 1, characterized in that: The insulating shell and the adjusting plate are both insulators.

3. The device for measuring the resistance of spherical charge according to claim 1, characterized in that: The four uprights are arranged in a square shape, the first contact pin is directly opposite to the third contact pin, and the second contact pin is directly opposite to the fourth contact pin.

4. The device for measuring the resistance of spherical charge according to claim 1, characterized in that: The insulating shell is cylindrical, and the adjusting plate is disc-shaped.

5. A method for measuring the resistance of a spherical charge, characterized in that: The device for measuring the resistance of spherical furnace charge according to any one of claims 1 to 4 is used to measure the resistance of the spherical furnace charge, comprising the following steps: (1) placing the spherical charge in the insulating shell and on the top of the four pillars, and making the spherical charge contact the third contact pin and the fourth contact pin; (2) placing an adjustment plate above the spherical charge and adjusting the position of the adjustment plate so that the first contact pin and the second contact pin are in contact with the charge; (3) The first contact pin and the third contact pin are connected to a voltmeter through wires, and the second contact pin and the fourth contact pin are connected to an ammeter through wires. After the constant current power supply supplies current to the device, the values ​​of the ammeter and the voltmeter are recorded and recorded as I and U respectively; (4) The resistance of the spherical charge is obtained according to the formula R=U / I.

6. The method for measuring the resistance of spherical charge according to claim 5, characterized in that: Used to measure the electrical resistance of spherical charges of different particle sizes when in contact.

7. The method for measuring the resistance of spherical charge according to claim 5, characterized in that: Used to measure the resistance of spherical charges of the same particle size and different composition when they are in contact.

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