Intermittent operation control method and system for sintering bed material system

Abstract

The present application relates to sintering system technical field, especially to a kind of intermittent operation control method and system of sintering bedding material system, and the process of upper bedding material is laid: bedding material is made to fall into the bottom of the laying-1 belt chute and is transported to the laying-1 belt conveyor with parabolic trajectory during the operation of laying-1 belt conveyor by preferential flow channel;Stop the process of upper bedding material laying: after laying-1 belt conveyor stops running, bedding material is temporarily accumulated in the bottom of laying-1 belt chute, and flows into the finished product belt chute under the action of gravity.The advantages of the present application are: preferential flow channel and parabolic trajectory material design, ensure that bedding material accurately falls into the designated chute during operation, prevent material from flowing, blocking or spilling;When stopping, bedding material can be temporarily accumulated and naturally flow into the finished product belt chute, avoid material retention or waste;Through parabolic trajectory and projectile condition control, avoid material impact equipment, reduce wear and mechanical stress, prolong equipment life.

Description

Technical Field

[0001] This invention relates to the field of sintering system technology, and in particular to an intermittent operation control method and system for a sintering base material system. Background Technology

[0002] The sintering bottom-laying system is a key process in modern sintering production. Its core function is to pre-lay a layer of sintered ore or fuel-free coarse particles of a certain size and thickness on the sintering machine trolley. This bottom-laying layer effectively protects the trolley grate bars, preventing them from being burned by direct contact with the high-temperature sintered ore, thus significantly extending the trolley's service life. Simultaneously, the bottom-laying layer optimizes the overall permeability of the sintering material layer, laying the foundation for uniform airflow distribution and improved sintering efficiency. Furthermore, the improved permeability creates favorable conditions for implementing low-consumption and high-efficiency processes such as hot-air sintering, ultimately achieving the goal of reducing the return ore rate and improving the quality of the finished sintered ore.

[0003] Currently, the commonly used traditional sintering bottom material feeding system operates continuously for 24 hours. Control of the feeding rate relies on regular inspections and manual adjustment of the material gate opening by personnel. This traditional manual control continuous operation mode has several major drawbacks:

[0004] 1. Serious energy waste:

[0005] To prevent the base material from clogging or overflowing at the transfer chute, the system usually operates at a low load rate, and the conveyor belt is in a non-full load state for a long time. This results in a lot of no-load loss of the drive motor, causing unnecessary waste of electrical energy.

[0006] 2. Increased equipment wear and tear, leading to high maintenance costs:

[0007] Mechanical components such as belts, idlers, and speed reducers experience a significant increase in wear rate during continuous operation. This not only shortens the replacement and maintenance cycle of key equipment components and increases spare parts consumption, but also raises the overall maintenance cost of the equipment.

[0008] 3. Low level of automation, high dependence on personnel, and potential safety risks:

[0009] The entire feeding process is highly dependent on manual intervention. Personnel need to conduct inspections and manual adjustments every 1 to 2 hours (the daily operation frequency is as high as more than 12 times), which is labor-intensive. In addition, manual adjustment has an inherent lag, making it difficult to accurately match the actual needs of the hopper in real time, which can easily lead to fluctuations in material level. Frequent on-site operations also increase the risk of personnel coming into contact with mobile equipment, bringing potential safety hazards. Summary of the Invention

[0010] The purpose of this invention is to provide an intermittent operation control method and system for a sintering base material system. By optimizing control and improving equipment structure, the intermittent operation of the sintering base material system can be achieved, significantly reducing energy consumption and equipment wear, and minimizing manual intervention.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A method for intermittent operation control of a sintering substrate system, comprising:

[0013] The process of laying the base material:

[0014] The base material is guided through the priority flow channel, so that the base material falls into the bottom of the base-1 belt chute in a parabolic trajectory during the operation of the base-1 belt conveyor and is conveyed to the base-1 belt conveyor. Then it is conveyed to the base material hopper by the downstream belt conveyor and the feed hopper belt conveyor.

[0015] Stop laying the base material process:

[0016] A hopper scale is installed at the bottom of the hopper for real-time material weight detection;

[0017] When the hopper scale detects that the material weight has reached or exceeded the set threshold, it sends a stop command to the control system after a preset delay.

[0018] The control system stops the paving-1 belt conveyor, the downstream belt conveyor, and the feed hopper belt conveyor in sequence according to the preset multi-level shutdown sequence.

[0019] After the Pavement-1 belt conveyor stops running, the base material temporarily accumulates at the bottom of the Pavement-1 belt chute and flows into the finished product belt chute under the action of gravity.

[0020] The priority flow channel consists of an upper slide plate set above the outlet of the bottom material conveyor belt chute leading to the finished product and the side wall of the bottom-1 conveyor belt chute.

[0021] The base material falls into the bottom of the Pavement-1 belt chute in a parabolic trajectory during the operation of the Pavement-1 belt conveyor, including:

[0022] S1. Establish the throwing distance for laying the base material;

[0023] S11, the final velocity of the base material when it leaves the upper chute, is calculated using the following formula:

[0024] ①;

[0025] In formula ①, This represents the final velocity of the paving material as it leaves the upper slide, ranging from 2.597 m / s to 3.278 m / s. The final velocity of the paving material is determined by the initial velocity of the paving material, the angle of the upper slide, and the length of the upper slide. The recommended values ​​are: [upper slide angle value would be inserted here]. 35 Calculate the length of the upper slide c = 0.6m; The initial velocity of the bottom material is represented by the value of 1 m / s to 2 m / s, based on the typical process layout of the sintering plant. The range of the initial velocity of the bottom material is determined by the difference in gravitational acceleration from the bottom material screening equipment outlet to the top of the upper chute and the angle of the bottom material conveyor chute. Represents gravitational acceleration. ; This indicates the installation angle of the upper chute along the material flow direction, with a value range of [value missing]. ; This indicates the length of the upper slide, in meters (m).

[0026] S12. The horizontal throwing distance for laying the base material is calculated using the following formula:

[0027] ②;

[0028] In formula ②, This indicates the horizontal throwing distance of the base material, in meters.

[0029] S13, Conditions for base material paving and shot blasting: ③;

[0030] in, This indicates the width of the chute leading from the base material to the finished product conveyor belt, with a value ranging from 0.6m to 1m.

[0031] S2. Establish conditions to ensure the circulation of base materials, as follows:

[0032] ④;

[0033] ⑤;

[0034] in, This indicates the horizontal projected length of the upper slide, in meters.

[0035] Horizontal projection length of the upper slide The width of the chute leading from the base material to the finished product conveyor belt should not exceed 80%.

[0036] The multi-stage shutdown sequence is as follows: first, stop the Pa-1 belt conveyor; after the first delay, stop the downstream belt conveyor; and after the second delay, stop the feed hopper belt conveyor.

[0037] The settings for the first and second delays are based on the length and speed of the corresponding belt, ensuring that any residual material on the corresponding belt is completely removed before the belt stops.

[0038] The temperature of the residual material should not exceed 120℃.

[0039] An intermittent operation control system for a sintering base material system includes a base material-1 belt chute, a base material-to-finished product belt chute, and the outlet of the base material-to-finished product belt chute is connected to the base material-1 belt chute. The outlet of the base material-to-finished product belt chute is provided with an upper slide plate, and the upper slide plate forms an installation angle along the material flow direction.

[0040] It also includes a paving-1 belt conveyor, a downstream belt conveyor, a feed hopper belt conveyor, a hopper scale, a bottom hopper, and a control system. The hopper scale is located at the bottom of the bottom hopper. The conveying system is composed of the paving-1 belt conveyor, the downstream belt conveyor, and the feed hopper belt conveyor. The conveying system is controlled by the control system.

[0041] The control system is a PLC.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] 1. Through intermittent operation control, the system only starts feeding when the weight of the material in the bottom hopper is lower than the set threshold, avoiding long-term idling of the equipment and significantly reducing energy consumption; multi-level delayed shutdown control ensures that there is no residual material on the belt, reducing energy loss caused by repeated start and stop.

[0044] 2. The design incorporates a priority flow channel and a parabolic trajectory for material drop, ensuring that the base material falls accurately into the designated chute during operation, preventing material deviation, blockage, or spillage. When the machine is stopped, the base material can be temporarily piled up and naturally flow into the finished product conveyor chute, avoiding material retention or waste and improving material utilization. By controlling the parabolic trajectory and projection conditions, material impact on the equipment is avoided, reducing wear and mechanical stress and extending equipment life.

[0045] 3. The hopper weighing detection is adopted and combined with the PLC control system to realize automatic start and stop, replacing the traditional manual inspection and manual adjustment of the material gate operation mode. The staff does not need to make frequent and high-intensity manual adjustments. The daily operation frequency is reduced from ≥12 times to 0 times, reducing labor intensity and realizing the automation of the bottom material feeding process, laying the foundation for the overall "less manned" or even "unmanned" operation of the sintering workshop.

[0046] 4. By eliminating manual on-site operation, the safety risks caused by personnel contact with mobile equipment are fundamentally reduced, and the fluctuations in working conditions caused by excessively high or low material levels due to the lag in manual adjustment are completely avoided, thereby improving the stability of the base material supply and the smooth operation of the sintering process.

[0047] 5. The chute reconfiguration module design (such as the upper chute) is adopted. Utilizing a simple physical structure and the principle of gravity, it realizes "priority flow guidance" during operation and "automatic steering" when the machine stops. This structure does not require an additional power drive device. That is, while ensuring the smooth flow of normal feeding, it perfectly solves the problem of the bottom material blocking the bottom material to the finished product belt chute when the machine stops. The structure is simple, the operation is reliable, and the failure rate is low.

[0048] 6. The multi-level delayed shutdown sequence and hot material protection mechanism ensure that the high-temperature sinter on the conveyor belt is removed before the system stops during shutdown. This design effectively prevents the risk of belt burns, aging, or even fire caused by high-temperature sinter (≥120℃) remaining on the stationary belt for a long time when the production status is abnormal, and provides additional safety protection for the equipment.

[0049] 7. By automatically triggering based on material weight, the base material laying system is transformed from the traditional 24-hour continuous operation mode to an intermittent operation mode based on actual needs. After the transformation, the total daily operating time of the system is shortened, reducing electricity costs. Attached Figure Description

[0050] Figure 1 This is a simplified diagram of the initial paving of the base material before the renovation.

[0051] Figure 2 This is a simplified diagram showing the paving of the base material before the renovation was stopped.

[0052] Figure 3 This is a simplified diagram of the starting process for laying the base material in this invention.

[0053] Figure 4 This is a simplified diagram of the invention for stopping the top layer of material.

[0054] Figure 5 This is a diagram of the intermittent operation of the sintering substrate laying system of the present invention.

[0055] Figure 6 This is a schematic diagram of the base material projection of the present invention.

[0056] In the diagram: 1. Laying-1 belt chute; 2. Laying bottom material leading to finished product belt chute; 3. Laying-1 belt conveyor; 4. Manual insert plate; 5. Side wall of the Laying-1 belt chute; 6. Upper chute plate; 7. Bottom of the Laying-1 belt chute; 8. Downstream belt conveyor; 9. Feed hopper belt conveyor; 10. Laying bottom hopper; 11. Hopper scale. Detailed Implementation

[0057] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0058] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0059] Example 1:

[0060] I. Intermittent operation control system for the sintering base material system, with equipment structural improvements:

[0061] 1. Chute Reconstruction Module:

[0062] See Figure 1 , Figure 2 The traditional manual insert plate 4 structure is eliminated. An upper sluice plate is added above the outlet of the bottom material leading to the finished product conveyor belt chute 2. The upper sluice plate is installed at an angle of 35° along the material flow direction. The length of the upper sluice plate is 0.6m. The upper sluice plate 6 is fixedly connected to the bottom material leading to the finished product conveyor belt chute 2.

[0063] (1) The design scheme is as follows:

[0064] System working principle:

[0065] This design targets the bottom material distribution system of a sintering machine, primarily addressing the following two operating conditions:

[0066] Normal bottom material laying situation: The bottom material is thrown out from the upper chute 6 in a parabolic shape and falls accurately into the bottom 7 of the chute of the -1 belt conveyor.

[0067] When the bottom material is stopped: After the bottom material of the bottom material 3 stops, it naturally accumulates at the bottom of the bottom material chute 7 to form a temporary material pile; the material pile changes its flow direction under the action of gravity, automatically turns and flows into the bottom material leading to the finished product belt chute 2.

[0068] Design constraints:

[0069] Width of the base material leading to the finished product conveyor belt chute 2: ;

[0070] Initial speed of laying base material: ;

[0071] Gravitational acceleration: ;

[0072] Launch distance: ;

[0073] The horizontal projection length b ≤ 0.64m;

[0074] Installation angle of the upper chute 6 along the material flow direction The value range is 30°~40°;

[0075] (2) Design principles and key parameters:

[0076] 1) Projectile performance design principle;

[0077] Objective: To ensure that the horizontal throwing distance of the base material after it is thrown from the upper chute 6 is [specified]. ≥2 width of the base material leading to the finished product conveyor belt chute ;

[0078] The physical process is as follows:

[0079] Initial speed of laying base material Enter the top of the upper slide 6;

[0080] The speed is v when it is accelerated by gravity on the upper slide 6 and reaches the end of the upper slide 6.

[0081] Lay the base material at an angle It undergoes projectile motion with velocity v.

[0082] 2) Shutdown circulation design principle;

[0083] Objective: To ensure that when the paving-1 belt conveyor 3 stops, the paving material can flow from the bottom 7 of the paving-1 belt chute to the paving material leading to the finished product belt chute 2;

[0084] Key constraint: Horizontal projected length of the upper slide 6 It should not be too large to avoid blocking or affecting the flow channel of the base material to the finished product conveyor belt chute 2.

[0085] 3.) Detailed calculation steps;

[0086] Step 1: Establish the formula for calculating the projectile distance;

[0087] The final velocity of the base material 6 minutes after leaving the upper chute: ;

[0088] Substitute the known values: ;

[0089] Horizontal launch distance: ;

[0090] The expression to be substituted into v: ;

[0091] Projectile conditions: ; ;

[0092] Step Two: Establish conditions for ensuring circulation;

[0093] Calculation of horizontal projection length: ;

[0094] Distribution guarantee conditions:

[0095] To ensure that the paving material can flow from the bottom 7 of the paving-1 belt conveyor 3 to the paving material leading to the finished product belt conveyor 2 when the paving-1 belt conveyor 3 stops, the horizontal projection length b of the upper chute 6 should not exceed 80% of the width h of the paving material leading to the finished product belt conveyor 2;

[0096] ,Right now: ;

[0097] Step 3: Determine the angle range;

[0098] Based on engineering practice, the installation angle of the upper chute 6 along the material flow direction is: ;

[0099] Factors to consider when choosing an angle:

[0100] Installation angle of the upper chute 6 along the material flow direction Too small (<30°): The base material slides down too quickly, resulting in a large impact and making it difficult to control the projectile. Due to length limitations, the base material may not form a parabola and will fall directly into the base material leading to the finished product conveyor chute 2, failing to reach the bottom 7 of the -1 conveyor chute, thus affecting the upper base material.

[0101] Installation angle of the upper chute 6 along the material flow direction Excessive (>40°): The bottom material will not slide smoothly and will easily accumulate on the upper chute 6. Due to the length limitation, the speed of the bottom material after passing the upper chute 6 may decrease, the landing point of the material flow parabola will shift forward, and the bottom material will directly enter the bottom material conveyor belt chute 2, affecting the upper bottom material.

[0102] Recommended angle: 35° (to balance various factors).

[0103] 4) Parameter solution and design range determination;

[0104] Solving for projectile conditions:

[0105] The solution for c is obtained from the projectile condition formula: ;

[0106] Solution to circulation conditions:

[0107] The solution for c is obtained from the formula for circulation conditions: ;

[0108] Overall design scope:

[0109] Design range of the upper slide length c: ;

[0110] Design scope: ;

[0111] 5) Detailed design calculations;

[0112] Design range calculations at different angles:

[0113] Parameter calculation at an angle of 30°:

[0114] ;

[0115] hour,

[0116] ;

[0117] ;

[0118] Horizontal projection: ;

[0119] Circulation conditions: Not satisfied.

[0120] Projectile performance verification:

[0121] Final velocity ;

[0122] Projectile distance ;

[0123] That just meets the requirements.

[0124] hour,

[0125] ;

[0126] ;

[0127] Feasible scope: ;

[0128] Horizontal projection ;

[0129] Circulation conditions: ,satisfy;

[0130] Circulation Balance: ;

[0131] Final velocity ;

[0132] Projectile distance ;

[0133] That just meets the requirements.

[0134] hour,

[0135] ;

[0136] ;

[0137] Feasible scope: ;

[0138] Horizontal projection ;

[0139] Circulation conditions: ,satisfy;

[0140] Circulation Balance: ;

[0141] Final velocity ;

[0142] Projectile distance ;

[0143] That just meets the requirements.

[0144] Parameter calculation at an angle of 35°:

[0145]

[0146] hour,

[0147] ;

[0148] ;

[0149] Feasible scope: ;

[0150] Horizontal projection ;

[0151] Circulation conditions: ,satisfy;

[0152] Circulation Balance: ;

[0153] Final velocity ;

[0154] Projectile distance ;

[0155] That just meets the requirements.

[0156] hour,

[0157] ;

[0158] ;

[0159] Feasible scope: ;

[0160] Horizontal projection ;

[0161] Circulation conditions: ,satisfy;

[0162] Circulation Balance: ;

[0163] Final velocity ;

[0164] Projectile distance ;

[0165] That just meets the requirements.

[0166] hour,

[0167] ;

[0168] ;

[0169] Feasible scope: ;

[0170] Horizontal projection ;

[0171] Circulation conditions: ,satisfy;

[0172] Circulation Balance: ;

[0173] Final velocity ;

[0174] Projectile distance ;

[0175] That just meets the requirements.

[0176] Parameter calculation at an angle of 40°:

[0177] ;

[0178] hour,

[0179] ;

[0180] ;

[0181] Feasible scope: ;

[0182] Horizontal projection: ;

[0183] Circulation conditions: ,satisfy.

[0184] Circulation Balance: ;

[0185] Projectile performance verification:

[0186] Final velocity ;

[0187] Projectile distance ;

[0188] That just meets the requirements.

[0189] hour,

[0190] ;

[0191] ;

[0192] Feasible scope: ;

[0193] Horizontal projection: ;

[0194] Circulation conditions: ,satisfy.

[0195] Circulation Balance: ;

[0196] Projectile performance verification:

[0197] Final velocity ;

[0198] Projectile distance ;

[0199] That just meets the requirements.

[0200] hour,

[0201] ;

[0202] ;

[0203] Feasible scope: ;

[0204] Horizontal projection: ;

[0205] Circulation conditions: .

[0206] Circulation Balance: ;

[0207] Projectile performance verification:

[0208] Final velocity ;

[0209] Projectile distance ;

[0210] That just meets the requirements.

[0211] The calculation results are summarized in Table 1.

[0212] Table 1 is a summary table of the calculation results.

[0213]

[0214] Summary of parameter ranges:

[0215] Based on calculation and analysis, the feasible parameter combinations within the initial velocity range of 1-2 m / s are:

[0216] Angle range: ;

[0217] Length range:

[0218] When θ = 30°: (Applicable to) );

[0219] When θ = 35°: ;

[0220] When θ = 40°: .

[0221] 6) Recommended design scheme:

[0222] Select parameters:

[0223] Upper slide angle: ;

[0224] Upper slide length: ;

[0225] Applicable initial velocity: ;

[0226] Projectile performance verification ( ):

[0227] Launch distance:

[0228] ;

[0229] Circulation performance verification:

[0230] Horizontal projection: ;

[0231] Maximum allowed The requirements are met.

[0232] Remaining space for circulation: ,adequate.

[0233] (3) Key technical points;

[0234] Core technical features:

[0235] The upper slide 6 design meets the following requirements:

[0236] ;

[0237] Technical advantages description:

[0238] Through precise mechanical calculations and parameter optimization, the scientific design of the upper chute 6 of the base material distribution system is achieved. Under normal operating conditions, it ensures that the base material falls accurately into the bottom 7 of the base-1 belt conveyor chute in a parabolic manner; under shutdown conditions, it reserves sufficient space for the natural flow of the base material, effectively solving the contradiction between projection performance and flow space in traditional designs.

[0239] Design safety margin analysis:

[0240] Projectile safety margin: times(enough);

[0241] Safety margin for circulation: 23% space allowance (sufficient);

[0242] Process adaptability: The design takes into account speed fluctuations in actual production;

[0243] Implementation Recommendations:

[0244] Manufacturing precision: Upper slide angle control error ±1°, length control error ±10 mm;

[0245] Installation requirements: Ensure a smooth transition between the upper slide plate 6 and the belt chute 1 of the -1 belt conveyor;

[0246] Operational monitoring: During the initial operation, observe the landing point of the base material and make minor adjustments to the angle if necessary;

[0247] Maintenance: Regularly check the wear of the upper slide plate 6 to ensure the surface is smooth.

[0248] 2. Traffic diversion mechanism:

[0249] The newly added upper chute 6 and the side wall 5 of the trough of the 1-1 belt chute 1 form a priority flow channel, so that the bottom material reaches the bottom 7 of the 1-1 belt chute in a parabolic trajectory and enters the 1-1 belt conveyor 3 during the operation of the 1-1 belt conveyor 3.

[0250] 3. Self-balancing structure during shutdown:

[0251] When the paving-1 belt conveyor 3 stops, the paving material forms a temporary accumulation at the bottom 7 of the paving-1 belt chute, and is redirected by gravity to flow into the paving material leading to the finished product belt chute 2.

[0252] Example 2:

[0253] In this embodiment, the intermittent operation control method and system of the sintering base material system are the same as those in Embodiment 1, with the addition of control optimization of the sintering base material system.

[0254] 1. Material weight trigger:

[0255] Install a hopper scale 11 at the bottom of the bottom hopper 10. When the detected material weight is ≥110 tons, delay for 60 seconds (the 60-second delay is to avoid instantaneous changes in material level detection affecting the actual weighing and to ensure accurate material feeding), and send a stop command to the PLC. See [link to PLC documentation]. Figure 3 , Figure 5 ;

[0256] 2. Multi-level shutdown sequence:

[0257] Automatic shutdown sequence: Belt conveyor 3 (120±10 seconds delay) → Downstream belt conveyor 8 → (120±10 seconds delay) → Feed hopper belt conveyor 9, see Figure 4 , Figure 5 .

[0258] 3. Thermal protection mechanism:

[0259] The downtime interval is set to 120 seconds (the interval is determined by the company based on actual conditions such as belt length and speed, and is not fixed) to ensure that residual hot material on the conveyor belt (≥120℃ high-temperature sintered ore generated when the production status is abnormal) is completely removed before the conveyor belt stops.

[0260] 4. Startup method:

[0261] Material weight low threshold trigger (automatic start):

[0262] When the weight of the material in the bottom hopper 10 drops to the set low weight threshold (e.g., 70 tons), the PLC automatically issues a start command and starts each belt in reverse shutdown sequence.

[0263] Flexible manual startup:

[0264] According to the actual production requirements for the bottom material weight (such as 90 tons or 30 tons, and in special circumstances, the bottom material can be laid earlier or later), the bottom material laying system is manually started on the sintering main control system (the PLC issues a start command, and each belt is started in reverse shutdown order).

[0265] (a) Chute reconfiguration module;

[0266] Structural modification:

[0267] The traditional insert-plate structure is replaced with an upper chute 6 above the outlet of the finished product conveyor belt chute 2, instead of the original one. See [link / reference needed]. Figure 6 The installation angle of the upper chute 6 along the material flow direction is preferably 30°, and its length is 0.5m. Under normal operating conditions, it ensures that the bottom material falls into the bottom chute 7 of the chute in a parabolic manner; under shutdown conditions, it reserves sufficient space for the natural flow of the bottom material; effectively solving the contradiction between projectile performance and flow space in traditional designs.

[0268] Traffic diversion mechanism:

[0269] The upper slide 6 and the side wall 5 of the trough of the paving-1 belt chute 1 together form a priority guiding channel; when the paving material passes through this channel, it can cross the drop with an ideal parabolic trajectory, accurately reach the bottom 7 of the paving-1 belt chute and fall into the paving-1 belt conveyor 3, thus achieving efficient conveying.

[0270] Self-balancing structure during shutdown:

[0271] When the paving-1 belt conveyor 3 stops running, the paving material naturally accumulates at the bottom 7 of the paving-1 belt chute to form a temporary material pile. Under the action of gravity, the material pile changes its flow direction, automatically turns and flows into the paving material leading to the finished product belt chute 2, thereby realizing the path switching of the paving material and effectively preventing the upstream material from blocking the reconstructed chute when the system stops.

[0272] (ii) Program control optimization;

[0273] Material weight trigger:

[0274] A hopper scale 11 is installed at the bottom of the bottom hopper 10 for real-time weighing. When the detected material weight reaches or exceeds a set threshold (e.g., 110 tons), the control system automatically delays for a preset time (e.g., 60 seconds) before sending a stop command to the PLC controller. The delay is intended to filter out instantaneous fluctuations in material level detection, ensuring the accuracy of the feeding quantity and the stability of the command. See [link to relevant documentation]. Figure 6 .

[0275] Multi-level shutdown sequence:

[0276] The control system executes a preset automatic shutdown sequence, typically as follows: first, the laying-1 belt conveyor 3 is stopped; after a first delay (e.g., 120±10 seconds), the downstream belt conveyor 8 is stopped; and after a second delay (e.g., 120±10 seconds), the feed hopper belt conveyor 9 is stopped. This sequence ensures that the base material is emptied step by step.

[0277] Thermal protection mechanism:

[0278] The downtime interval (e.g., 120 seconds) can be adjusted and set according to the actual length, belt speed and other parameters of each belt conveyor. Its core purpose is to ensure that all residual hot material (≥120℃ high-temperature sintered ore generated when the production status is abnormal) on the conveyor belt surface can be completely transported before the belt stops completely, thereby avoiding the accumulation of high-temperature sintered ore that could burn or damage the belt and eliminate potential fire hazards.

[0279] Startup methods: The system can be started in the following two ways:

[0280] Material weight low threshold trigger (automatic start):

[0281] When the weight of the material in the bottom hopper 10 drops to the set low weight threshold (e.g., 70 tons), the PLC automatically issues a start command and starts each belt in reverse shutdown sequence.

[0282] Flexible manual startup:

[0283] According to the actual production requirements for the bottom material weight (such as 90 tons or 30 tons, and in special circumstances, the bottom material can be laid earlier or later), the bottom material laying system is manually started on the sintering main control system (the PLC issues a start command, and each belt is started in reverse shutdown order).

[0284] Example 3:

[0285] In this embodiment, the intermittent operation control method and system of the sintering base material system are the same as those in Embodiment 1, with the addition of a working process.

[0286] S1, the process of laying the base material;

[0287] The system starts automatically through one of the above-mentioned low material level threshold triggering or centralized linkage triggering methods;

[0288] After startup, the base material enters the base material 3 via the priority guide channel of the chute reconstruction module in a parabolic trajectory during the operation of the base-1 belt conveyor 3, and is then transported to the base material hopper 10 via the downstream belt conveyor 8 and the feed hopper belt conveyor 9.

[0289] S2, Stop laying the base material:

[0290] When the weight of material in the bottom hopper is ≥110 tons, the PLC issues a stop command.

[0291] The control system executes a multi-level shutdown sequence and ensures hot material protection at set intervals;

[0292] During this process, when the first belt conveyor 3 stops, the self-balancing structure immediately comes into play, and the paving material automatically turns and flows into the paving material chute 2 leading to the finished product belt, completing the entire intermittent operation cycle.

[0293] This invention employs intermittent operation control, where the system only initiates feeding when the weight of the base material in the hopper falls below a set threshold, preventing prolonged idling and significantly reducing energy consumption. Multi-level delayed shutdown control ensures no residual material on the conveyor belt, minimizing energy loss from repeated start-stop cycles. A priority guide channel and parabolic trajectory material drop design ensure the base material accurately falls into the designated chute during operation, preventing material deviation, blockage, or spillage. During shutdown, the base material can temporarily accumulate and naturally flow into the finished product conveyor chute, avoiding material retention or waste and improving material utilization. The parabolic trajectory and projectile strips further enhance the system's effectiveness. Component control prevents material impact on equipment, reduces wear and mechanical stress, and extends equipment life. The use of hopper weighing detection, combined with a PLC control system, enables automatic start-up and shutdown, replacing traditional manual inspection and manual adjustment of the material gate. This eliminates the need for frequent and intensive manual adjustments by personnel, reducing the daily operation frequency from ≥12 times to 0 times, thus reducing labor intensity and automating the bottom material feeding process. This lays the foundation for "less manned" or even "unmanned" operation of the sintering workshop as a whole. By eliminating manual on-site operation, the risks associated with personnel contact with mobile equipment are fundamentally reduced. Safety risks are eliminated, completely avoiding fluctuations in operating conditions caused by excessively high or low material levels due to manual adjustment delays, thus improving the stability of the bottom material supply and the smooth operation of the sintering process. A chute reconfiguration module design (such as an upper chute) is adopted, utilizing a simple physical structure and gravity principle to achieve "priority flow guidance" during operation and "automatic steering" during shutdown. This structure requires no additional power drive device, thus perfectly solving the problem of bottom material clogging the bottom material to the finished product conveyor chute during shutdown while ensuring smooth normal feeding. It features a simple structure, reliable operation, and low failure rate. Multi-stage... The delayed shutdown sequence and hot material protection mechanism ensure that the high-temperature sintered ore on the conveyor belt is removed before the system stops. This design effectively prevents the risk of belt burns, aging, or even fire caused by high-temperature sintered ore (≥120℃) remaining on the stationary belt for a long time during abnormal production conditions, providing additional safety protection for the equipment. By automatically triggering based on material weight, the bottom material laying system is transformed from the traditional 24-hour continuous operation mode to an intermittent operation mode based on actual needs. After the transformation, the total daily operating time of the system is shortened, reducing electricity costs.

Claims

1. A method for intermittent operation control of a sintering substrate laying system, characterized in that, include: The process of laying the base material: The base material is guided through the priority flow channel, so that the base material falls into the bottom of the base-1 belt chute in a parabolic trajectory during the operation of the base-1 belt conveyor and is conveyed to the base-1 belt conveyor. Then it is conveyed to the base material hopper by the downstream belt conveyor and the feed hopper belt conveyor. Stop laying the base material process: A hopper scale is installed at the bottom of the hopper for real-time material weight detection; When the hopper scale detects that the material weight has reached or exceeded the set threshold, it sends a stop command to the control system after a preset delay. The control system stops the paving-1 belt conveyor, the downstream belt conveyor, and the feed hopper belt conveyor in sequence according to the preset multi-level shutdown sequence. After the Pavement-1 belt conveyor stops running, the base material temporarily accumulates at the bottom of the Pavement-1 belt chute and flows into the finished product belt chute under the action of gravity.

2. The intermittent operation control method for a sintering substrate laying system according to claim 1, characterized in that, The priority flow channel is composed of an upper slide plate set above the outlet of the bottom material conveyor belt chute leading to the finished product and the side wall of the bottom material conveyor belt chute.

3. The intermittent operation control method for a sintering substrate laying system according to claim 1, characterized in that, The base material falls into the bottom of the paving-1 belt chute in a parabolic trajectory during the operation of the paving-1 belt conveyor, including: S1. Establish the throwing distance for laying the base material; S11, the final velocity of the base material when it leaves the upper chute, is calculated using the following formula: ①； In formula ①, This represents the final velocity of the paving material as it leaves the upper chute, with a value ranging from 2.597 m / s to 3.278 m / s. This represents the initial velocity of the base material, with a value ranging from 1 m / s to 2 m / s; Represents gravitational acceleration. ; This indicates the installation angle of the upper chute along the material flow direction, with a value range of [value missing]. ; This indicates the length of the upper slide, in meters (m). S12. The horizontal throwing distance for laying the base material is calculated using the following formula: ②； In formula ②, This indicates the horizontal throwing distance of the base material, in meters. S13, Conditions for paving the base material and shooting: ③; in, This indicates the width of the chute leading from the base material to the finished product conveyor belt, with a value ranging from 0.6m to 1m. S2. Establish conditions to ensure the circulation of base materials, as follows: ④； ⑤； in, This indicates the horizontal projected length of the upper slide, in meters. Horizontal projection length of the upper slide The width of the chute leading from the base material to the finished product conveyor belt should not exceed 80%.

4. The intermittent operation control method for a sintering substrate laying system according to claim 1, characterized in that, The multi-stage shutdown sequence is as follows: first, stop the Pa-1 belt conveyor; after the first delay, stop the downstream belt conveyor; and after the second delay, stop the feed hopper belt conveyor.

5. The intermittent operation control method for a sintering substrate laying system according to claim 4, characterized in that, The setting of the first delay and the setting of the second delay are based on the length and speed of the corresponding belt, so that the residual material on the corresponding belt is completely removed before the belt stops.

6. The intermittent operation control method for a sintering substrate laying system according to claim 5, characterized in that, The temperature of the residual material is normally no higher than 120°C.

7. An intermittent operation control system for a sintering substrate laying system that implements the method of any one of claims 1-6, characterized in that, It includes a chute for laying-1 belt, a bottom material conveyor leading to a finished product belt chute, and the outlet of the bottom material conveyor leading to the finished product belt chute is connected to the chute for laying-1 belt. The outlet of the bottom material conveyor leading to the finished product belt chute is equipped with an upper slide plate, and the upper slide plate forms an installation angle along the material flow direction.

8. The intermittent operation control method for a sintering substrate laying system according to claim 7, characterized in that, It also includes a paving-1 belt conveyor, a downstream belt conveyor, a feed hopper belt conveyor, a hopper scale, a bottom hopper, and a control system. The hopper scale is located at the bottom of the bottom hopper. The conveying system is composed of the paving-1 belt conveyor, the downstream belt conveyor, and the feed hopper belt conveyor. The conveying system is controlled by the control system.

9. The intermittent operation control method for a sintering substrate laying system according to claim 8, characterized in that, The control system is a PLC.

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