CN110686512A - Sintering machine material distribution control system and method - Google Patents
Sintering machine material distribution control system and method Download PDFInfo
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- CN110686512A CN110686512A CN201910964717.0A CN201910964717A CN110686512A CN 110686512 A CN110686512 A CN 110686512A CN 201910964717 A CN201910964717 A CN 201910964717A CN 110686512 A CN110686512 A CN 110686512A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
Abstract
The application discloses control system and method of sintering machine cloth, this control system includes feed bin, main door and main door aperture detection device, wherein: the discharge hole of the storage bin is communicated with the main door; the main door is provided with a bearing, and the main door can rotate around the bearing under the driving of a driving device, so that the opening degree of the main door can be adjusted; the main door opening degree detection device comprises an inclination angle sensor which is horizontally arranged on the side wall of the main door through a fixing component; the tilt sensor is connected to a data processor, and the data processor is used for calculating a main door opening value according to an output signal of the tilt sensor. In the control mode of sintering machine cloth in this application, can be accurate timely acquire the opening value of main door to operating personnel can accurate adjustment main door aperture, and even bed of material thickness is obtained to more accurate control bed of material thickness, improves the sintering deposit quality.
Description
Technical Field
The application relates to the technical field of sintering, in particular to a system and a method for controlling material distribution of a sintering machine.
Background
Sintering refers to a process of converting a powdery material into a compact body, and in a steel production process, iron ore powder, coal powder and lime are uniformly mixed according to a certain proportion, and sintered ore with sufficient strength and granularity is obtained through sintering and is used as a blast furnace ironmaking conveying raw material. Aiming at the material distribution process in the sintering production process flow, if the material layer after material distribution has a flat surface and uniform thickness, the whole air permeability of the material layer can be improved, and the quality of the sintering ore can be improved, so the quality of the sintering ore is directly influenced by the material distribution effect, and the control of the material distribution of the sintering machine becomes a research focus.
Whether the material layer thickness is even is the important factor that the cloth effect is good or bad, and at present, the flow of cloth is adjusted to the aperture size that utilizes the feed inlet on adjusting the cloth groove among the cloth process usually. If the opening of the feeding opening is adjusted to be large, the flow of the material distributing device for distributing the material to the sintering machine trolley is large, the thickness of a corresponding material layer is large, and otherwise, the thickness of the material layer is small. The size of feed inlet is markd by the mechanical scale that sets up on the feed inlet, and the staff confirms the size of feed inlet at that time through the scale data of observing the mechanical scale.
Because the sintering field environment is severe, and dust and vapor are more, make the easy corrosion of mechanical scale, the staff is difficult to accurately observe the scale data of mechanical scale to the size of unable accurate detection cloth in-process feed inlet. If the size of feed inlet can't be confirmed accurately, then the staff can't be the accuse cloth flow, and then can cause the control of cloth process inaccurate, can't obtain the bed of material that has even thickness.
Disclosure of Invention
The application provides a control system and method for sintering machine material distribution, which aim to solve the technical problem that a material layer with uniform thickness cannot be obtained due to the fact that the size of a feeding port cannot be accurately detected in the prior art.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application discloses a control system for distributing materials of a sintering machine, the control system includes a storage bin, a main door and a main door opening degree detection device, wherein:
the discharge hole of the storage bin is communicated with the main door;
the main door is provided with a bearing, and the main door can rotate around the bearing under the driving of a driving device, so that the opening degree of the main door can be adjusted;
the main door opening degree detection device comprises an inclination angle sensor which is horizontally arranged on the side wall of the main door through a fixing component;
the tilt sensor is connected to a data processor, and the data processor is used for calculating a main door opening value according to an output signal of the tilt sensor.
Optionally, in the above control system for distributing materials of a sintering machine, the tilt sensor is disposed on the transverse central axis of the side wall of the main door, and is close to the bearing.
Optionally, in the system for controlling material distribution of a sintering machine, the range of the tilt sensor is 0 to 45 °, and the range corresponding to the output signal is 4 to 20 mA.
Optionally, in the above control system for distributing materials of a sintering machine, the fixing assembly includes a support frame and an adjusting bolt, and the support frame is fixed on the side wall of the main door through the adjusting bolt.
Optionally, in the above control system for distributing the sintering machine, the adjusting bolt is welded to the main door side wall.
In a second aspect, the embodiment of the application discloses a method for controlling material distribution of a sintering machine, which utilizes any one of the above control systems for material distribution of a sintering machine, wherein a plurality of auxiliary doors are arranged on a main door in the control system, the auxiliary doors are correspondingly provided with valve positioners, the valve positioners are connected with a data processor, the data processor is also connected with a layer thickness detection device,
the method comprises the following steps:
setting a given material layer thickness value according to the production requirement of the material layer thickness, and setting the opening degree of a main door according to the given material layer thickness value;
the bin unloads materials according to the opening degree of the main door, and the layer thickness detection device detects the thickness of the material layer to obtain the current actual thickness of the material layer;
and adjusting the corresponding auxiliary opening degree through the valve positioner according to the difference value between the material layer thickness given value and the current actual material layer thickness.
Optionally, in the method for controlling material distribution of a sintering machine, the setting of the opening degree of the main door according to the given value of the thickness of the material layer includes:
setting a preset opening value of the main door according to a given material layer thickness value, and driving the main door to operate by using a driving device;
according to the operation of the main door, the inclination angle sensor outputs a current signal;
calculating the current displacement and the current opening value of the main door according to the current signal;
and if the current opening value is equal to the preset opening value, stopping the driving device.
Optionally, in the method for controlling distribution of a sintering machine, the calculating a current displacement amount and a current opening value of the main door according to the current signal includes:
calculating the rotation angle of the main door according to the current signal;
calculating the current displacement of the main door according to the rotation angle;
and calculating the percentage of the current displacement amount to the maximum displacement amount of the main door to obtain the current opening value, wherein the maximum displacement amount of the main door corresponds to a current signal output by the tilt sensor in a full-scale process.
Optionally, in the method for controlling distribution of a sintering machine, the calculating a current displacement amount of the main door according to the rotation angle includes:
and calculating the current displacement of the main door by using a chord length formula, wherein the central angle is the rotation angle, and the radius is the distance between the bearing and the arc edge of the main door.
Optionally, in the method for controlling material distribution of a sintering machine, the adjusting, by the valve positioner, the corresponding auxiliary opening according to the difference between the given value of the material layer thickness and the current actual material layer thickness includes:
if the difference value between the material layer thickness given value and the current actual material layer thickness is larger than zero, the opening of the auxiliary door is increased;
and if the difference value between the material layer thickness given value and the current actual material layer thickness is smaller than zero, reducing the opening of the auxiliary valve.
Compared with the prior art, the beneficial effect of this application is:
the application provides a control system and a method for distributing sintering machines. In the material distribution process, a material layer thickness given value is set according to the production requirement of the material layer thickness, the opening degree of the main door is set according to the material layer thickness given value, the main door is driven by the driving device to rotate around the bearing, and meanwhile, the inclination angle sensor outputs current signals according to the rotation of the main door, so that the main door outputs different current values at different rotation angles. And the data processor connected with the tilt angle sensor calculates the current opening value of the main door in real time according to the current signal of the data processor, and stops the driving device if the current opening value reaches the opening degree of the main door required by production, and the storage bin unloads according to the set opening degree of the main door. In the control mode of sintering machine cloth in this application, can be accurate timely acquire the opening value of main door to operating personnel can accurate adjustment main door aperture, and even bed of material thickness is obtained to more accurate control bed of material thickness, improves the sintering deposit quality.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without any inventive effort.
Fig. 1 is a schematic diagram of a basic structure of a control system for distributing materials of a sintering machine according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating operation variation of the main door opening according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a positional relationship between a main door and an auxiliary door according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for controlling material distribution of a sintering machine according to an embodiment of the present invention;
description of reference numerals: 1. a storage bin; 2. a main door; 3. a bearing; 4. a drive device; 5. a tilt sensor; 6. a support frame; 7. adjusting the bolt; 8. an auxiliary door; 9. a valve positioner; 10. a sintering pallet; 11. and (4) a round roller.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a basic structural diagram of a control system for distributing materials of a sintering machine according to an embodiment of the present invention is shown. As shown in fig. 1, the control system includes: feed bin 1, main door 2 and main door aperture detection device. The raw materials to be sintered are contained in the storage bin 1, the discharge port of the storage bin 1 is communicated with the main door 2, the discharge port of the main door 2 is matched with the round roller 11, and the round roller 11 can be arranged on the sintering machine trolley 10 in a rolling mode. The bin 1 is unloaded to the sintering machine trolley 10 through the main door 2, and the opening degree of the main door 2 is related to the unloading flow, so that the material layer thickness on the sintering machine trolley 10 is influenced. The opening degree of the main door 2 is detected by a main door opening degree detection device, wherein the relative distance between the main door 2 and the round roller 11 is the main door opening degree.
The tilt sensor in the main door opening degree detecting device is horizontally disposed on the side wall of the main door 2 through a fixing member. The tilt sensor is an element capable of outputting a current value according to a rotation angle, and when the main door is rotated, the tilt sensor can output a corresponding current value. The tilt sensor 5 is connected to a data processor, and the data processor is used for converting the output signal of the tilt sensor 5 into the displacement of the main door 2, and further calculating the opening value of the main door.
The specific material distribution process is as follows: the staff sets for the bed of material thickness given value according to required bed of material thickness in the production demand, sets up corresponding main door aperture according to this bed of material thickness given value again, and drive arrangement 4 drives main door 2 and rotates around bearing 3 this moment, and simultaneously, inclination sensor 5 detects the rotation of main door 2. The tilt sensor 5 is caused to output different current values with different rotational positions of the main door 2. According to the current value output by the tilt sensor 5, the connected data processor correspondingly converts the current value into the displacement of the main door 2, and calculates the current opening value of the main door 2 according to the displacement. And if the current opening value reaches the opening degree of the main door required by production, stopping the driving device 4 and finishing the opening degree setting of the main door 2. And finally, discharging the material by the bin 1 according to the set opening degree of the main door. In the control mode of sintering machine cloth in this application, can be accurate timely acquire the opening value of main door to operating personnel can accurate adjustment main door aperture, and even bed of material thickness is obtained to more accurate control bed of material thickness, improves the sintering deposit quality.
Further, the tilt angle sensor 5 is arranged on the transverse central axis of the side wall of the main door 2 and close to the bearing 3. Because the tilt angle sensor 5 is provided with an external wire, when the tilt angle sensor 5 is arranged at the far end away from the bearing 3, the main door 2 runs, the displacement of the tilt angle sensor 5 is larger, if the external wire is too short, the stress is large, the dragging is serious, and if the external wire is too long, the running of other parts is hindered. When the inclination angle sensor is arranged at a position close to the bearing 3, the displacement of the inclination angle sensor 5 is small, and the influence on an external connecting line is small. In addition, a reinforcing rib plate is arranged in the transverse middle axis of the side wall of the main door 2, and the inclination angle sensor 5 is installed on the reinforcing rib plate through a fixing component and has no influence on the overall structure of the main door 2.
Above-mentioned fixed subassembly includes support frame 6 and adjusting bolt 7, and support frame 6 adjusts through the level bar, ensures that support frame 6 installs on the horizontal direction, and rethread adjusting bolt 7 is fixed in on the deep floor of main door 2 lateral wall, and further through the welding after the fixed, ensures that support frame 6 can not become flexible. After the fixed assembly is installed, the inclination angle sensor 5 is installed on the supporting frame 6, and when the fault is overhauled, only the inclination angle sensor 5 needs to be overhauled or replaced.
In general, when the maximum rotation angle of the main door 2 is 45 °, a general material layer thickness can be satisfied. In the control system for distributing materials of the sintering machine provided by the embodiment of the invention, the rotation angle range of the main door 2 is about 0-45 degrees when the main door operates, so that the measuring range of the inclination angle sensor 5 is 0-45 degrees, and the inclination angle sensor 5 correspondingly outputs a current value of 4-20mA according to the measuring range when rotating. The output current value of the tilt angle sensor 5 is 4mA when the tilt angle sensor is horizontally placed, the output current value is 20mA when the tilt angle sensor rotates to the maximum measuring range along the rotating direction of the main door 2, and the rotating angle and the output current value are in linear proportion relation. That is, the output current value of the tilt sensor 5 is 4mA when the main door opening is 0%, that is, when the tilt sensor is in contact with the round roller 11, and the output current value of the tilt sensor 5 is 20mA when the main door opening is 100%, that is, when the tilt sensor is deviated from the initial position by 45 °, the current value of the tilt sensor 5 at an arbitrary angle in the range can be calculated by the linear ratio, and the current value can be converted into the displacement amount of the main door 2 by the data processor.
Referring to fig. 2, a diagram of operation variation of the main door opening according to an embodiment of the present invention is shown. As shown in fig. 2, when the main door 2 is located at the position with the smallest opening degree, that is, at the position 1, the main door rotation angle is 0, the current value output by the tilt sensor 5 is 4mA, when the main door 2 is located at the position with the largest opening degree, that is, at the position 2, the main door rotation angle Φ is 45 °, and the current value output by the tilt sensor 5 is 20 mA.
Corresponding to the system, the embodiment of the invention also provides a method for controlling the material distribution of the sintering machine, which utilizes the system for controlling the material distribution of the sintering machine, and refers to fig. 3, which is a position relation diagram of the main door and the auxiliary door provided by the embodiment of the invention. Referring to fig. 3, a plurality of auxiliary doors 8 are arranged on the main door 2 in the control system, and the thickness of the material loading layer of the sintering pallet 10 is adjusted and controlled by the cooperation of the main door 2 and the auxiliary doors 8 in the material distribution process. A plurality of door 8 of assisting all correspond and are provided with valve locator 9, and valve locator 9 is through the flexible size of 8 apertures of corresponding supplementary door of control of the flexible of driving actuating cylinder, valve locator 9 all is connected with data processor, data processor still is connected with the bed thickness detection device.
Referring to fig. 4, a schematic flow chart of a method for controlling material distribution of a sintering machine according to an embodiment of the present invention is shown. With reference to fig. 4, the method comprises the following steps:
step S100: setting a given material layer thickness value according to the production requirement of the material layer thickness, and setting the opening degree of a main door according to the given material layer thickness value;
and setting a preset opening value of the main door according to the given value of the thickness of the material layer, and driving the main door to operate by using a driving device. For example, the opening degree of the main door 2 is set to be 50% according to the given value of the material layer thickness, and then the main door 2 is driven to rotate around the bearing 3 by the driving device 4.
The tilt sensor outputs a current signal in response to operation of the main door. In the operation process of the main door 2, the inclination angle sensor 5 detects the rotation angle of the main door in real time, and the rotation angles of the main door 2 are 0-45 degrees and respectively correspond to the current values of 4-20mA output by the inclination angle sensor 5.
And calculating the current displacement and the current opening value of the main door according to the current signal. The data processor converts the current value output by the inclination angle sensor 5 into the rotation angle of the main door 2, and the conversion process is as follows:
in the formula IiThe current value output by the inclination angle sensor at any position is in units of mA and IiThe value range of (1) is 4-20mA, theta is the rotation angle of the main door, and the unit is. Further, the current displacement of the main door is calculated by using a chord length formula, and the calculation formula is as follows:
in the formula, yθThe current displacement of the main door is represented as r, namely the radius, namely the distance between the bearing and the arc edge of the main door, theta is a central angle, namely the rotation angle of the main door, and the value range of theta is 0-phi, namely 0-45 degrees.
And calculating the percentage of the current displacement amount to the maximum displacement amount of the main door to obtain the current opening value, wherein the maximum displacement amount of the main door corresponds to a current signal output by the tilt sensor in a full-scale process. That is, corresponding to the position 2 in fig. 2, when the main door 2 is rotated to 45 °, the displacement amount calculated from the current signal output from the tilt sensor is the maximum displacement amount of the main door. The current opening value is calculated as follows:
in the formula, YθThe opening value when the main door rotation angle is theta, namely the current opening value, and y is the maximum displacement of the main door.
If the current opening value is equal to the preset opening value, stopping the driving device, and if the calculated Y is the same as the preset opening value, stopping the driving deviceθThe previously preset 50% is reached, the driving device 4 is controlled to stop, and the main door 2 stops operating.
Step S200: the stock bin unloads according to the opening degree of the main door, and the layer thickness detection device detects the thickness of the material layer to obtain the current actual thickness of the material layer;
step S300: and adjusting the corresponding auxiliary opening degree through the valve positioner according to the difference value between the material layer thickness given value and the current actual material layer thickness.
If the difference value between the material layer thickness given value and the current actual material layer thickness is larger than zero, the opening of the auxiliary door is increased; and if the difference value between the material layer thickness given value and the current actual material layer thickness is smaller than zero, reducing the opening of the auxiliary valve. Because in the actual production process, drive each cylinder respectively through each valve locator, and then the aperture of every auxiliary door of independent control, the aperture of every auxiliary door is all inequality. Assuming that the 1# auxiliary door, the 2# auxiliary door, …, and the n # auxiliary door are respectively X1, X2, …, Xn, and the main door is Y in fig. 3, the overall opening Z1, Z2, …, Zn at each auxiliary door position are respectively: y + X1, Y + X2, …, Y + Xn. After the main opening degree Y is determined, corresponding adjustment control is carried out by combining the auxiliary door, and the calculation formula of the whole opening degree is as follows:
Zi＝Y+(-1)mXi(i-1, 2, …, n; m-0 or 1)
In the formula: ziTo assist the overall opening of the door i, XiThe auxiliary opening of the auxiliary door i can be obtained through a corresponding valve positioner.
In the above formula, it is assumed that the main door opening Y does not change after coarse adjustment, and Z needs to be adjusted when the material layer thickness needs to be changediThe value is increased or decreased, only the opening X of the auxiliary valve is needed to be adjustediThe required requirements can be met. When m is 1, the given value of the thickness of the material layer is smaller than the current actual thickness of the material layer when the opening degree Y of the main door is unchanged, and only the opening degree X of the auxiliary door needs to be adjustediThe size is reduced; when m is 0, the given value of the thickness of the material layer is larger than the current actual thickness of the material layer when the opening degree Y of the main door is unchanged, and only the opening degree X of the auxiliary door needs to be adjustediBecomes larger.
According to the control method for distributing the sintering machine, the opening degree value of the main door can be accurately and timely obtained, so that an operator can cooperatively adjust the opening degree of the main door and the opening degree of the auxiliary door, the material layer thickness can be more accurately controlled, the uniform material layer thickness can be obtained, and the quality of the sintered ore can be improved.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (10)
1. The utility model provides a control system of sintering machine cloth, its characterized in that, control system includes feed bin (1), main door (2) and main door aperture detection device, wherein:
the discharge hole of the storage bin (1) is communicated with the main door (2);
the main door (2) is provided with a bearing (3), and the main door (2) can rotate around the bearing (3) under the driving of a driving device (4), so that the opening degree of the main door (2) can be adjusted;
the main door opening degree detection device comprises an inclination angle sensor (5), and the inclination angle sensor (5) is horizontally arranged on the side wall of the main door (2) through a fixing component;
the tilt sensor (5) is connected to a data processor for calculating a main door opening value from an output signal of the tilt sensor (5).
2. A control system for distribution of sintering machines according to claim 1, characterized in that the tilt sensor (5) is located on the lateral centre axis of the side wall of the main door (2) and close to the bearing (3).
3. The control system of the sintering machine burden distribution according to claim 1, characterized in that the range of the tilt sensor (5) is 0-45 ° and the range corresponding to the output signal is 4-20 mA.
4. The control system of the sintering machine burden distribution according to claim 1, characterized in that the fixing component comprises a support frame (6) and an adjusting bolt (7), and the support frame (6) is fixed on the side wall of the main door (2) through the adjusting bolt (7).
5. A control system of sintering machine burden distribution according to claim 4, characterized in that the adjusting bolt (7) is welded on the main door (2) side wall.
6. A method for controlling the material distribution of a sintering machine is characterized in that a control system of the material distribution of the sintering machine according to any one of claims 1 to 5 is utilized, a plurality of auxiliary doors are arranged on a main door in the control system, valve positioners are correspondingly arranged on the plurality of auxiliary doors, the valve positioners are connected with a data processor, the data processor is also connected with a layer thickness detection device,
the method comprises the following steps:
setting a given material layer thickness value according to the production requirement of the material layer thickness, and setting the opening degree of a main door according to the given material layer thickness value;
the stock bin unloads according to the opening degree of the main door, and the layer thickness detection device detects the thickness of the material layer to obtain the current actual thickness of the material layer;
and adjusting the corresponding auxiliary opening degree through the valve positioner according to the difference value between the material layer thickness given value and the current actual material layer thickness.
7. The method for controlling distribution of sintering machines according to claim 6, wherein the setting of the opening degree of the main door according to the given value of the thickness of the material layer comprises:
setting a preset opening value of the main door according to a given material layer thickness value, and driving the main door to operate by using a driving device;
according to the operation of the main door, the inclination angle sensor outputs a current signal;
calculating the current displacement and the current opening value of the main door according to the current signal;
and if the current opening value is equal to the preset opening value, stopping the driving device.
8. The method of claim 7, wherein said calculating a current displacement and a current opening value of said main door based on said current signal comprises:
calculating the rotation angle of the main door according to the current signal;
calculating the current displacement of the main door according to the rotation angle;
and calculating the percentage of the current displacement amount to the maximum displacement amount of the main door to obtain the current opening value, wherein the maximum displacement amount of the main door corresponds to a current signal output by the tilt sensor in a full range.
9. The method of controlling sintering machine burden distribution according to claim 8, wherein said calculating a current displacement amount of the main door according to the rotation angle comprises:
and calculating the current displacement of the main door by using a chord length formula, wherein the central angle is the rotation angle, and the radius is the distance between the bearing and the arc edge of the main door.
10. The method for controlling the distribution of the sintering machine according to claim 6, wherein the adjusting of the corresponding auxiliary opening degree by the valve positioner according to the difference value between the given value of the bed thickness and the current actual bed thickness comprises:
if the difference value between the material layer thickness given value and the current actual material layer thickness is larger than zero, the opening of the auxiliary door is increased;
and if the difference value between the material layer thickness given value and the current actual material layer thickness is smaller than zero, reducing the opening of the auxiliary valve.
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| CN106940138A (en) * | 2016-01-04 | 2017-07-11 | 中冶长天国际工程有限责任公司 | A kind of thickness of feed layer detection means and method |
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