Blast furnace integrated stock rod device and control method

Abstract

The invention discloses a blast furnace integrated stock rod device and a control method. Comprising a reversible motor, a control device and a frequency converter, the control device controls rotation of the reversible motor through the frequency converter, and a material surface roller and a counterweight roller are arranged on an output shaft of the reversible motor and are coaxially arranged; a charge level heavy hammer rope is arranged on the charge level roller and bypasses a plurality of fixed pulleys, and a charge level heavy hammer is arranged at the tail end of the charge level heavy hammer rope; a weighing sensor is arranged below the fixed pulley closest to the charge level heavy hammer, and the weighing sensor is connected with the input end of the control device; and a counterweight hammer rope is arranged on the counterweight roller, and a counterweight hammer matched with the charge level counterweight hammer is arranged at the tail end of the counterweight hammer rope. According to the invention, the charge level roller and the counterweight roller which are coaxial are utilized and matched with the frequency converter, so that the charge level can be accurately monitored.

Description

TECHNICAL FIELD

[0001] The present application relates to a blast furnace integrated probe device, in particular to a blast furnace and bin real-time material level detection device and control method with high temperature and large dust. BACKGROUND

[0002] The blast furnace probe mainly detects the change of the blast furnace material surface in the blast furnace production, and when the material surface is lower than the set material line, the raw material is added to the blast furnace in time to maintain the continuous production of the blast furnace and prevent accidents. The blast furnace probe now mostly uses a frequency converter (DC device) with torque control to cooperate with PLC to realize it, and the difficulty is that when the weight reaches the material surface, the frequency converter (DC device) needs to have sensitive torque detection and control ability to ensure that the probe can follow the change of the material surface. In the actual use process, due to the poor lifting torque control of the frequency converter (DC device), the blast furnace material level detection often appears stepped change or cannot be detected in real time.

[0003] The traditional probe device has high system control difficulty on the one hand, and high control function requirements for the frequency converter (DC device) on the other hand, and the procurement cost is also increased. In the actual use process, stability problems often occur, which causes the production efficiency of the blast furnace to decrease. SUMMARY

[0004] In order to overcome the above defects, the purpose of the present application is to provide a blast furnace integrated probe device and control method.

[0005] In order to achieve the above purpose, the blast furnace integrated probe device of the present application comprises a reversible motor, a control device and a frequency converter, wherein the control device controls the rotation of the reversible motor through the frequency converter, a material surface roller and a counterweight roller are arranged on the output shaft of the reversible motor, and the material surface roller and the counterweight roller are coaxially arranged.

[0006] A material surface weight rope is arranged on the material surface roller, the material surface weight rope passes through a plurality of fixed pulleys and is provided with a material surface weight at the end thereof;

[0007] A weighing sensor is arranged below the fixed pulley closest to the material surface weight, and the weighing sensor is connected with the input end of the control device;

[0008] A counterweight rope is arranged on the counterweight roller, and the counterweight rope is provided with a counterweight matched with the material surface weight at the end thereof.

[0009] Further, the mass of the counterweight is 80%-95% of the mass of the material surface weight.

[0010] Further, a controlled brake is arranged corresponding to the output shaft of the reversible motor, and the control device controls the controlled brake to work in the brake release or controlled brake state.

[0011] Further, the torque generated by the material surface weight on the coaxial roller through the material surface weight rope and the torque generated by the counterweight on the coaxial roller through the counterweight rope are opposite.

[0012] Further, an encoder is arranged on the shaft of the reversible motor, and the encoder is connected with the input end of the control device.

[0013] Further, a reduction gearbox is arranged on the shaft of the reversible motor, and an encoder is arranged on the output shaft of the reduction gearbox, and the encoder is connected with the input end of the control device.

[0014] To achieve the above object, the blast furnace integrated probe control method of the present application is realized based on the blast furnace integrated probe device, and the method comprises the following steps:

[0015] The control device sends the instruction of loosening the probe, simultaneously loosens the controlled brake, and the frequency converter controls the movement of the material surface weight and the counterweight, and the torques generated by the material surface weight and the counterweight on the material surface roller and the counterweight roller are opposite in direction.

[0016] The control device monitors the load cell in real time, and when the material surface weight reaches the material level, the pressure on the load cell is reduced; the control device sends the signal of "material surface reached" to stop the probe; at this time, the frequency converter is always in the state of loosening the brake, and keeps zero torque, and the whole device is in the state of "floating probe" measurement with the downward micro torque; meanwhile, the material surface weight rope is always in the state of tension under the action of the mechanical torque, and the material surface weight is also kept in the vertical state under the action of the mechanical torque.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1. The present application realizes real-time and accurate measurement of the material level. In the integrated device, the load cell is arranged below the fixed pulley, and the fixed pulley is pressed on the load cell, so that when the weight reaches the material surface, the pressure on the fixed pulley is reduced, and the pressure on the load cell is also reduced, and the load cell transmits the signal change to the computer through the load cell transmitter, and the computer sends back the material level value at this time. The user can easily know that the weight has reached the material surface.

[0019] After receiving the "material surface reached" signal, the system controls the frequency converter to remove the torque of the frequency converter, but the frequency converter always keeps the working state of opening the controlled brake during the whole running process, the counterweight (11) generates the lifting torque on the coaxial roller through the steel wire counterweight rope (13), keeps the material surface weight (7) in the vertical state, and keeps the steel wire material surface weight rope (5) in the tight state, and the resultant torque at the material surface weight (7) is the downward micro torque, and can always follow the continuous change of the blast furnace material level downward in real time.

[0020] 2、The patent of the application adopts mechanical torque mode, the whole device operation is directly reliable, the "to material surface" signal is obtained by direct detection, so that the function requirement of the frequency converter is not high, the normal domestic frequency converter equipment can meet the corresponding technical requirements, greatly reducing the difficulty of frequency converter and PLC software development and communication development, basically achieving on-site debugging-free. The replacement technology of the later equipment is low in technical content and good in universality.

[0021] 3、The application has low cost and high precision. Compared with the existing frequency converter (direct current device) measuring device, the integrated probe ruler device greatly reduces the performance requirement and price of the frequency converter, and domestic equipment can completely replace the current foreign high-end frequency converter (direct current device), so that the cost of the whole measuring device is significantly reduced. At the same time, the material surface signal is directly detected by the weighing sensor, and is directly controlled by the external mechanical torque, so that the continuous detection of the material line can be ensured after the device sends the "after material surface" signal, so the reliability of the material level detection is greatly improved, which is beneficial to improve the fine production of the blast furnace.

[0022] 4、The whole device principle is simple, control is simple, and operation is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of the integrated probe ruler device of the blast furnace.

[0024] FIG. No. Explanation:

[0025] Reversible motor (1); encoder (2); control device (computer or PLC) (3); material surface roller (4); material surface weight rope (5); fixed pulley (6); material surface weight (7); weighing sensor (weighing pressure head) (8); weighing transmitter (9); reduction box 10; counterweight (11); counterweight roller (12); counterweight rope (13); frequency converter (14). DETAILED DESCRIPTION

[0026] The embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0027] In the description of the application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation to the application.

[0028] The terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0029] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Figure 1 The blast furnace integrated probe device of an embodiment of the present application is shown, which comprises a reversible motor (1), an encoder (2), a control device (3), a frequency converter (14), wherein the control device (3) controls the rotation of the reversible motor (1) through the frequency converter (14), a material surface roller (4) and a counterweight roller (12) are arranged on the output shaft of the reversible motor (1), a material surface weight rope (5) is arranged on the material surface roller (4), the material surface weight rope (5) passes through a plurality of fixed pulleys (6) and is provided with a material surface weight (7) at the end thereof, a weighing sensor (8) is arranged below one of the fixed pulleys (6), the weighing sensor (8) is connected with a weighing transmitter (9), the weighing transmitter (9) is connected with the control device, and the weighing sensor (8) is arranged below the fixed pulley closest to the material surface weight (7). A counterweight rope (13) is arranged on the counterweight roller (12), and the counterweight rope (13) is provided with a counterweight (11) at the end thereof. The torque generated by the material surface weight (7) through the material surface weight rope (5) and the counterweight (11) through the steel wire counterweight rope (13) on the coaxial roller must be opposite.

[0031] In the embodiment, a reduction box 10 is connected to one end of the input shaft of the reversible motor 1, the reduction box 10 is connected with the encoder 2, and a master switch is arranged on the input shaft of the reduction box 10 to ensure that only one determination signal is sent in each operation cycle.

[0032] The working principle of the integrated probe device is as follows: in the form of mechanical torque, the weight of the material surface weight (7) is greater than the weight of the counterweight (11), so that the integrated probe material surface weight (7) always maintains a downward micro-torque, so that the probe weight always follows the change of the material level and directly measures the blast furnace material level, and the measurement process is not affected by the working environment of the blast furnace. Considering the use environment and the friction between the material surface weight rope and the fixed pulley, the mass of the counterweight can generally be 80%-95% of the mass of the material surface weight.

[0033] In the integrated probe device, the reversible motor (1) is controlled by the frequency converter to control the lifting of the material surface weight (7). When the material surface weight (7) reaches the material level, the pressure on the weight sensor will certainly decrease, so that the device can accurately send the signal of "to the material surface". At this time, the integrated probe device is converted into the "floating probe" state, and the material surface weight (7) of the probe always follows the real-time descent of the blast furnace material surface, just like floating on the material surface. The function of the "floating probe" is to rely on the mechanical reverse torque, that is, the counterweight (11) generates a torque on the material surface weight (7) of the probe through the steel wire counterweight rope (13) on the coaxial roller. In this way, a small downward combined force moment is formed on the material surface weight (7) of the probe, which ensures that the integrated probe device can follow the real-time descent of the blast furnace material surface and measure the material surface data. The height of the material surface is read out through the encoder (2), and the encoded signal is converted into a 4-20mA signal and sent to the control system or directly sent to the material level data through communication, so as to facilitate the observation of the material level of the blast furnace and other containers in the control room.

[0034] The working process of the integrated probe device is as follows: when working normally, after the "work" command is sent to the integrated device from the outside, the control device of the device sends the command to loosen the probe and simultaneously loosens the controlled actuator. The frequency converter controls the material surface weight (7) and the counterweight (11) to move, and the movement of the material surface weight (7) and the counterweight (11) generates torque in opposite directions on the material surface roller (4) and the counterweight roller (12). Start at the standby position, the device releases the probe into the blast furnace at high speed, and after reaching the speed changing point, it will run downward at low speed until the material surface. At this time, the device will stop releasing the probe, the frequency converter is always in the loose brake state, maintaining zero torque, and the whole device is in the "floating probe" measurement state with a small downward combined force moment. At the same time, the material surface weight rope (5) is always in tension under the action of the mechanical torque, and the material surface weight (7) is also kept in the vertical state under the action of the mechanical torque. In this way, the accurate real-time material level signal is detected and sent out. After reaching the set material line of the blast furnace, the external "work" command is cancelled, and the invention will automatically lift the material surface weight (7) and the counterweight (11) to the standby position. The lifting process is also divided into high and low speed, which shortens the running time of the device and improves the operation rate of the blast furnace. When the device is in the standby position, the controlled actuator is closed, and the measurement of this time is ended, waiting for the next work command of the main system.

[0035] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A blast furnace integrated sounding rod device, comprising a reversible motor, a control device and a frequency converter, wherein the control device controls the rotation of the reversible motor through the frequency converter, characterized in that: The material surface roller and the counterweight roller are coaxially arranged on the output shaft of the reversible motor. The material surface weight rope is arranged on the material surface roller, and the material surface weight rope passes through a plurality of fixed pulleys and is provided with a material surface weight at the end thereof. The weighing sensor is arranged below the fixed pulley closest to the material surface weight, and the weighing sensor is connected with the input end of the control device. The counterweight rope is arranged on the counterweight roller, and the counterweight rope is provided with a counterweight matched with the material surface weight at the end thereof.

2. The integrated fettling device for a blast furnace according to claim 1, characterized in that: The mass of the counterweight is 80%-95% of the mass of the material surface weight.

3. The integrated fettling device for a blast furnace according to claim 1, characterized in that: The controlled brake is arranged corresponding to the output shaft of the reversible motor, and the control device controls the controlled brake to work in the brake releasing state or the controlled brake state.

4. The integrated fonn of a fonn and a sight gauge for a blast furnace as recited in claim 1 wherein: The moment generated by the material surface weight through the material surface weight rope and the moment generated by the counterweight through the counterweight rope on the coaxial roller are opposite.

5. The integrated sight gauge for a blast furnace as claimed in claim 1, wherein: The encoder is arranged on the shaft of the reversible motor, and the encoder is connected with the input end of the control device.

6. The integrated fonn of sight device for a blast furnace as set forth in claim 1, wherein: The reduction box is arranged on the shaft of the reversible motor, and the encoder is arranged on the output shaft of the reduction box, and the encoder is connected with the input end of the control device.

7. A method for controlling the integrated measuring rod of a blast furnace, which is implemented based on the integrated measuring rod device of claim 1, characterized in that: The method comprises the following steps: The control device sends the instruction of releasing the material surface, and simultaneously releases the controlled brake, and the frequency converter controls the movement of the material surface weight and the counterweight, and the movement of the material surface weight and the counterweight generates the moments in the opposite directions on the material surface roller and the counterweight roller. The control device monitors the weighing sensor in real time, and when the material surface weight reaches the material level, the pressure of the weighing sensor is reduced, and the control device sends the signal of "to the material surface" to stop releasing the material surface; at this time, the frequency converter is always in the brake releasing state, the zero moment is maintained, and the whole device is in the "floating material surface" measurement state with the micro moment downward; meanwhile, the material surface weight rope is always in the tension state under the action of the mechanical moment, and the material surface weight is also maintained in the vertical state under the action of the mechanical moment.

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