Method and device for preventing material layer of sintering machine from being pressed

Abstract

The invention relates to the technical field of sintering equipment, in particular to a method and device for preventing a material layer of a sintering machine from being pressed. According to the invention, through quantitative water adding compensation and dynamic material distribution control, the problem of material layer pressing after trolley replacement is systematically solved; by supplementing water in advance, the fluctuation of the water content of the materials is controlled within + / -0.5% during shutdown, and excessive drying is avoided; after starting, the thickness deviation of a material layer is reduced from + / -30% to + / -10%, and the punching incidence rate is reduced by more than 90%; the ignition qualified rate is increased by 8%, the under-burning rate is reduced by 12%, and the sintered ore yield and the strength index are remarkably improved; the method has the advantages of simplicity and convenience in operation, high adaptability, low cost and the like, and can be widely applied to similar sintering production lines. In addition, a material screening device is installed behind the secondary mixing machine, it is guaranteed that materials entering the belt conveyor are all wet spherical materials meeting the requirements, and therefore the problem that the dry materials rush at the position of a material distribution cylinder is avoided.

Description

Technical Field

[0001] This invention relates to the field of sintering equipment technology, and more specifically, to a method and apparatus for preventing material layer compression in a sintering machine. Background Technology

[0002] In the sintering production process, changing the trolley is a common maintenance downtime operation. Taking the Egang 260㎡ sintering machine as an example, a single trolley change operation usually takes 5 to 7 minutes, during which material needs to be interrupted and the machine stopped. In the existing technology, due to the prolonged residence time of the material in the equipment, excessive evaporation and drying of moisture can occur, leading to the following problems: 1. Material overflow at the feeding cylinder: The increased fluidity of the dried material makes it easy for material to overflow at the feeding cylinder after the machine is started, resulting in uneven material layer thickness (too thick) and abnormal moisture distribution; 2. Sintering abnormalities: An excessively dry or thick material layer can cause poor ignition effect, under-burning, and other problems, seriously affecting the quality and quantity of sintered ore.

[0003] Therefore, existing technologies lack systematic solutions for changes in material moisture content and material distribution control during downtime, resulting in a long adjustment period required to restore normal production after trolley replacement, which severely restricts the stability and efficiency of the sintering process. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing a method to prevent material layer compression in sintering machines. This method systematically solves the problem of material layer compression after changing trolleys through water compensation and dynamic material distribution control. This invention also provides a device to prevent material layer compression in sintering machines by installing a material screening device after the secondary mixer to ensure that the material entering the belt conveyor is a moist spherical material that meets the requirements, thereby avoiding the problem of dry material being pushed up at the material distribution cylinder.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for preventing material stacking in a sintering machine includes the following steps:

[0007] Step 1: Adjust the water supply of the mixer in advance to compensate for the moisture loss during shutdown: Monitor the sintering machine trolley replacement operation, and adjust the normal water supply X t / h to (X+2) t / h according to the sintering machine trolley replacement time, that is, increase the water supply by 2 t / h to ensure the moisture content of the mixture after mixing.

[0008] Step 2, material cut-off control: Calculate the distance to the trolley to be replaced based on the position of the mixing silo and the running position of the trolley to be replaced. When the distance between the trolley to be replaced and the number of trolley intervals at the lifting point reaches the set value, execute the material cut-off operation and stop adding water.

[0009] Step three, cloth control: cloth mode switching, cloth device is switched from automatic to valve position control, real-time monitoring of the running position of the waiting car, when the distance between the waiting car and the lifting point reaches the set value, the cloth cylinder coefficient of the cloth device is lowered;

[0010] Step four, resume production: replace the sintering machine trolley, complete the start-up, increase the cloth cylinder coefficient of the cloth device to the normal production value, switch the cloth mode to automatic cloth, adjust the water addition to X t / h, and restore normal production.

[0011] Further, in step one, the water addition of normal operation is adjusted to X+2 t / h for 15-25 minutes to compensate for the evaporation of material moisture during shutdown.

[0012] Further, in step two, the mixed material bin position is 30-60 t, and the distance between the waiting car and the lifting point is 3-6 blocks.

[0013] Further, in step three, the distance between the waiting car and the lifting point is 1 car, and the cloth cylinder coefficient of the cloth device is lowered to 0.2.

[0014] Further, in step four, after starting, observe for 3-5 minutes to confirm no material, gradually increase the cloth cylinder coefficient to 0.5 at a rate of 0.1 each time, and adjust the water addition to X t / h after 2-3 minutes of increasing the cloth cylinder coefficient to make the material moisture normal.

[0015] Further, from the step two to the step four, the moisture content of the material fluctuates by ±0.5%, and the material passes through the material screening device to make the required wet spherical material enter the belt conveyor; in step four, the deviation of the material layer thickness after starting is ±10%.

[0016] Further, in step three, the cloth cylinder coefficient is lowered to make the material layer thickness under the cylinder 30%-50% of the normal material layer.

[0017] According to a device for preventing sintering machine material layer compression, comprising a primary mixer, a secondary mixer, a material screening device, a belt conveyor and a sintering machine trolley connected in sequence, the sintering machine trolley is provided with a cloth device near one end of the belt conveyor; the material screening device comprises a plurality of independent elastic diaphragms, a stretching member, a bidirectional screw, a gear, a driving wheel and a motor, the elastic diaphragms are divided into several pieces and collectively combined to cover the stretching member, the stretching member is provided with the bidirectional screw on both sides, each bidirectional screw is driven by a different gear, the driving wheel is meshed with two symmetric gears at the same time, and the motor drives the driving wheel to rotate.

[0018] Further, the stretching piece comprises a telescopic rod group, a limiting guide rail and straight rods, the telescopic rod group comprises a plurality of transversely arranged telescopic rods, the telescopic rods are composed of a plurality of rod units connected end to end, adjacent rod units are rotationally connected through riveted joints, the riveted joints in the middle of the telescopic rods are embedded in the sliding grooves of the limiting guide rail, two straight rods are symmetrically installed on the two sides of the telescopic rod group, the middle of the straight rods is rotationally connected with the end of the telescopic rod, and the two ends of the straight rods are respectively connected with the threaded parts of different bidirectional lead screws.

[0019] Further, the elastic diaphragms are wrapped outside the straight rods and the telescopic rod group to form a closed flexible skin, adjacent elastic diaphragms form telescopic material falling openings in the area between adjacent telescopic rods, and the opening degree of the telescopic material falling opening is in a negative correlation with the length of the telescopic rod.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] (1) The present application solves the problem of material layer compaction after replacing the trolley through quantitative water compensation and dynamic material distribution control; the water content of the material is controlled within ±0.5% during shutdown through pre-watering, excessive drying is avoided, the thickness deviation of the material layer is reduced from ±30% to ±10% after starting, the material punching rate is reduced by more than 90%, the ignition qualified rate is increased by 8%, the under-burning rate is reduced by 12%, and the finished sintered ore rate and strength index are significantly improved; the present application has the advantages of simple operation, strong adaptability, low cost and the like, and can be widely applied to similar sintering production lines.

[0022] (2) The present application installs a material screening device after the secondary mixer to ensure that the material entering the belt conveyor is wet spherical material meeting the requirements, thereby avoiding the problem of material punching at the material distribution cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The flowchart for preventing material layer compaction after replacing the trolley in the present application;

[0024] Figure 2 The structural schematic diagram of the sintering machine equipment system of the present application;

[0025] Figure 3 The partial structure perspective view of the material screening device of the present application;

[0026] Figure 4 The partial structure sectional view of the material screening device of the present application;

[0027] Figure 5 The structural schematic diagram of the stretching piece of the material screening device of the present application in compression;

[0028] Figure 6The structure diagram of the stretching member of the material screening device in the lengthening state.

[0029] In the figure: 1, primary mixer; 2, secondary mixer; 3, belt conveyor; 4, distributing device; 5, sintering machine trolley; 6, material screening device; 61, stretching member; 611, telescopic rod; 612, limiting guide rail; 613, straight rod; 62, telescopic material dropping opening; 63, bidirectional screw; 64, gear; 65, driving wheel; 66, motor. DETAILED DESCRIPTION

[0030] In order to more clearly illustrate the present application, the present application will be further described below in conjunction with the preferred embodiments and the accompanying drawings. Those skilled in the art should understand that the specific description below is illustrative rather than limiting, and should not limit the protection scope of the present application.

[0031] Example 1:

[0032] Please refer to Figures 1-6 A method for preventing sintering machine material layering material, the embodiment adopts 260m2 sintering machine of E'gang.

[0033] S1, adjust the water addition of the primary mixer in advance to compensate for the water loss during shutdown: monitor the sintering machine trolley replacement operation, and adjust the water addition X t / h of the normal operation to (X+2) t / h according to the sintering machine trolley replacement time;

[0034] Specifically in this embodiment, the water addition of the primary mixer is 8.8 t / h, and the mixed material moisture is 7%; 20 minutes before the sintering machine trolley replacement operation, the water addition is adjusted to 10.8 t / h, and the mixed material moisture after mixing is ensured to be 7.8±0.2%;

[0035] S2, material cutting control: according to the mixed material bin position and the running position of the trolley to be replaced, the distance of the trolley to be replaced is calculated, when the distance between the trolley to be replaced and the lifting point trolley interval block number reaches the set value, the material cutting operation is executed, and the water addition is stopped;

[0036] Specifically in this embodiment, when the mixed material bin position is in the interval of 30-60 t, the position of the trolley to be replaced at a distance of 3-6 trolleys from the lifting point is selected, the material cutting operation is executed, and the water addition is stopped;

[0037] S3, material distribution control: switch the material distribution mode, switch the distributing device from automatic to valve position control, and monitor the running position of the trolley to be replaced in real time, when the distance between the trolley to be replaced and the lifting point reaches the set value, the material distribution cylinder coefficient of the distributing device is adjusted downward;

[0038] Specifically in the embodiment, the material distribution device is switched to the valve position control mode (manual), when the distance between the waiting trolley and the lifting point is only one interval, the material distribution cylinder coefficient of the material distribution device is lowered from the normal working value 0.5 to 0.2, and the material layer thickness is monitored to be in the range of 250-420mm;

[0039] S4, resuming production: replacing the sintering machine trolley, after completion, starting up, increasing the material distribution cylinder coefficient of the material distribution device to the normal production value, switching the material distribution mode to automatic material distribution, adjusting the water addition amount to X t / h, and resuming normal production.

[0040] Specifically in the embodiment, after the sintering machine trolley is replaced and the equipment is started up, the material distribution cylinder is observed for 3-5 minutes to confirm that there is no material flushing, the material distribution cylinder coefficient is gradually increased to 0.5 at an amplitude of 0.1 each time, the material distribution device returns to the automatic material distribution mode, and after normal feeding for 2 minutes, the water addition amount is adjusted to 8.8 t / h, and the moisture of the mixed material is restored to 7%.

[0041] The water amount of the primary mixer before and after water addition adjustment and during the recovery stage is shown in Table 1 below:

[0042] Table 1: Water amount of the primary mixer before and after water addition adjustment and during the recovery stage

[0043]

[0044] The cylinder coefficient of the material distribution device before and after adjustment and during the recovery stage and the corresponding material layer data are shown in Table 2 below:

[0045] Table 2: Cylinder coefficient and corresponding material layer thickness data before and after adjustment and during the recovery stage

[0046]

[0047] Through the method provided by the present application, the water content of the material during shutdown is controlled within ±0.5%, and excessive drying of the material is avoided; at the same time, after starting up, the material layer thickness deviation is reduced from ±30% to ±10%, the material flushing rate is reduced by more than 90%, the ignition qualified rate of the sintering quality is increased by 8%, the underburning rate is reduced by 12%, and the sintered ore yield and strength index are significantly improved.

[0048] Example 2:

[0049] Please refer to Figures 1-6The utility model provides a kind of prevent sintering machine material layering material's device, including primary mixer 1, secondary mixer 2, belt conveyor 3, distributing device 4, sintering machine trolley 5 and material screening device 6, primary mixer 1 is equipped with inlet one, water inlet one and discharge port one, the discharge port one of primary mixer 1 is connected the inlet two of secondary mixer 2, secondary mixer 2 is also equipped with water inlet two and discharge port two, the discharge port two of secondary mixer 2 is connected material screening device 6, material screening device 6, belt conveyor 3 and sintering machine trolley 5 are sequentially connected, and distributing device 4 is installed near the end of sintering machine trolley 5 to belt conveyor 3.

[0050] In actual production process, material mixes one belt returns ore and adds water, then enters primary mixer 1 and mixes, adds 70-80% of total water amount, reaches basic wetting;Then material is sent into secondary mixer 2, and the remaining 20-30% of water is accurately added, so that the wet material rolls and granulates;Wet small spherical mixture after granulation is screened by material screening device 6, and the mixture meeting size and moisture content is conveyed to the head of sintering machine trolley 5 by belt conveyor 3, and at this time, distributing device 4 evenly lays the mixture on sintering machine trolley 5.

[0051] It should be noted that, in actual production line, belt conveyor 3 has an inclination angle (inclination angle is less than 18°), and the inclination angle of material screening device 6 is ±3% of the inclination angle of belt conveyor 3.

[0052] Example 3:

[0053] Please refer to Figures 1-6 A kind of prevent sintering machine material layering material's device according to example 2, material screening device 6 includes elastic diaphragm, stretching piece 61, bidirectional lead screw 63, gear 64, driving wheel 65 and motor 66;

[0054] Elastic diaphragm is divided into several, collectively combined to cover stretching piece 61, bidirectional lead screw 63 is symmetrically installed on both sides of stretching piece 61, each bidirectional lead screw 63 is driven to rotate by different gear 64, driving wheel 65 is engaged with two symmetric gears 64 simultaneously, and motor 66 drives driving wheel 65 to rotate.

[0055] Stretching piece 61 includes telescopic rod group, limit guide rail 612 and straight rod 613, telescopic rod group includes several transversely arranged telescopic rods 611, telescopic rod 611 is composed of a plurality of rod units connected head to tail, adjacent rod units are relatively rotatably connected by riveting joint, when the axis of each rod unit is aligned, telescopic rod 611 reaches maximum length;When non-zero angle is formed at riveting joint, the axial length of telescopic rod 611 is shortened.

[0056] The center riveting joint of the telescopic rod 611 is a center riveting point, which is embedded in the sliding groove of the limiting guide rail 612 to make the center riveting point slide along the axis direction of the limiting guide rail 612, while limiting the radial displacement of the center riveting point, ensuring that the telescopic rod 611 maintains a predetermined motion trajectory during the telescopic process, and providing an axial displacement compensation margin for the telescopic rod 611 to avoid jamming caused by dimensional tolerance when the telescopic rod 611 is straightened or bent.

[0057] Two straight rods 613 are symmetrically installed on both sides of the telescopic rod group, the middle part of the straight rod 613 is hinged with the end part of the telescopic rod 611, and the two ends of the straight rod 613 are respectively connected with the threaded parts of different bidirectional screws 63; when the bidirectional screw 63 rotates, it drives the two straight rods 613 to produce synchronous and opposite linear motion, thereby driving the telescopic rod group to realize cooperative telescoping.

[0058] A plurality of independent elastic diaphragms are wrapped outside the two straight rods 613 and the telescopic rod 611 to form a closed flexible skin, and the area between adjacent elastic diaphragms in the two telescopic rods 611 forms a telescopic material dropping port 62, the opening and closing state of which is controlled by the length change of the telescopic rod 611; as shown in Figure 5 When the telescopic rod 611 is shortened, the included angle between adjacent rod units increases, the elastic diaphragm relaxes, and the opening size of the telescopic material dropping port 62 increases; as shown in Figure 6 When the telescopic rod 611 is straightened, the axes of the rod units are collinear, the elastic diaphragm is tensioned, and the opening size of the telescopic material dropping port 62 is contracted to a minimum value.

[0059] The edge of the telescopic material dropping port 62 is provided with a wear-resistant insert to prolong the service life.

[0060] By replacing elastic diaphragms with different elastic moduli, various particle material sorting or precise quantitative feeding scenes can be adapted.

[0061] A material collecting box is installed below the telescopic material dropping port 62, so that the material passing through the telescopic material dropping port 62 enters the material collecting box.

[0062] In actual production process, after the material is granulated by the mixing mechanism, the wet small spherical mixed material enters the material screening device 6, by adjusting the opening size of the telescopic material dropping port 62, the wet small spherical mixed material is made to have an outer diameter larger than the opening size of the telescopic material dropping port 62, so that the wet small spherical mixed material enters the belt conveyor 3 along the upper edge of the material screening device 6, the material that is not sufficiently wet in the mixing machine to form a small sphere falls into the material collecting box through the telescopic material dropping port 62, and the material in the material collecting box reenters the mixing machine for granulation.

Claims

1. A method for preventing material layering and pressing in a sintering machine, characterized in that: Includes the following steps: Step 1: Adjust the water supply of the mixer in advance to compensate for the water loss during shutdown: Monitor the sintering machine trolley replacement operation, and adjust the normal operation water supply X t / h to X+2 t / h according to the sintering machine trolley replacement time. Step 2, material cut-off control: Calculate the distance to the trolley to be replaced based on the position of the mixing silo and the running position of the trolley to be replaced. When the distance between the trolley to be replaced and the number of trolley intervals at the lifting point reaches the set value, execute the material cut-off operation and stop adding water. Step 3, Fabric control: Switch the fabric mode, switch the fabric device from automatic to valve position control, monitor the running position of the trolley to be replaced in real time, and when the distance between the trolley to be replaced and the lifting point reaches the set value, reduce the fabric cylinder coefficient of the fabric device. Step 4, Resume Production: Replace the sintering machine trolley, turn on the machine after completion, adjust the material feeding cylinder coefficient of the material feeding device to the normal production value, switch the material feeding mode to automatic material feeding, adjust the water supply to X t / h, and resume normal production.

2. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: In step one, the time to adjust the water addition rate from X t / h during normal operation to X+2 t / h is 15-25 minutes to compensate for the evaporation of material moisture during shutdown.

3. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: In step two, the mixing silo capacity is 30-60t, and the distance between the trolley to be replaced and the lifting point is 3-6 blocks.

4. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: In step three, when the distance between the trolley to be replaced and the lifting point reaches the distance of one trolley, the material cylinder coefficient of the material feeding device is reduced to 0.

2.

5. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: In step four, after starting the machine, observe for 3-5 minutes to confirm that there is no material rushing. Gradually increase the cloth cylinder coefficient to 0.5 in increments of 0.1 each time. After increasing the cloth cylinder coefficient for 2-3 minutes, adjust the water addition to X t / h to ensure that the material moisture content is normal.

6. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: From the material cutting operation in step two to the start-up in step four, the material moisture content fluctuates within ±0.5%. The material passes through a material screening device to ensure that the wet, spherical material that meets the requirements enters the conveyor belt. In step four, the material layer thickness deviation after start-up is ±10%.

7. The method for preventing material layering and pressing in a sintering machine according to claim 1, characterized in that: In step three, the coefficient of the fabric cylinder is lowered so that the thickness of the material layer on the trolley below the cylinder is 30%-50% of the normal material layer.

8. An apparatus for preventing material stacking in a sintering machine according to any one of claims 1-7, characterized in that: The system includes a primary mixer (1), a secondary mixer (2), a material screening device (6), a belt conveyor (3), and a sintering machine trolley (5) connected in sequence. A material feeding device (4) is installed on one end of the sintering machine trolley (5) near the belt conveyor (3). The material screening device (6) includes multiple independent elastic diaphragms, a tension member (61), a bidirectional screw (63), a gear (64), a drive wheel (65), and a motor (66). The elastic diaphragms are divided into several pieces and are combined to cover the tension member (61). The bidirectional screws (63) are installed on both sides of the tension member (61). Each bidirectional screw (63) is driven by a different gear (64). The drive wheel (65) meshes with two symmetrical gears (64) at the same time. The motor (66) drives the drive wheel (65) to rotate.

9. The device for preventing material layering and pressing in a sintering machine according to claim 8, characterized in that: The tensioning member (61) includes a telescopic rod assembly, a limiting guide rail (612), and a straight rod (613). The telescopic rod assembly includes several horizontally arranged telescopic rods (611). Each telescopic rod (611) is composed of multiple rod units connected end to end. Adjacent rod units are rotatably connected by riveting joints. The riveting joint in the middle of the telescopic rod (611) is embedded in the groove of the limiting guide rail (612). Two straight rods (613) are symmetrically installed on both sides of the telescopic rod assembly. The middle part of the straight rod (613) is rotatably connected to the end of the telescopic rod (611). The two ends of the straight rod (613) are respectively connected to the threaded parts of different bidirectional lead screws (63).

10. The device for preventing material layering and pressing in a sintering machine according to claim 9, characterized in that: The elastic diaphragm covers the outside of the straight rod (613) and the telescopic rod assembly to form a closed flexible skin. The adjacent elastic diaphragms form telescopic discharge ports (62) in the area between adjacent telescopic rods (611). The opening of the telescopic discharge ports (62) is negatively correlated with the length of the telescopic rods (611).

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