Anti-blocking control method of full-automatic coal flow sampling and sample preparation transportation system

Abstract

The invention relates to an anti-blocking control method of a full-automatic coal flow sampling and sample preparation transportation system, and belongs to the technical field of sampling of flowing or falling materials. The method comprises the following steps: firstly, recording the weight of a two-way weighing belt conveyor during no-load, starting the two-way weighing belt conveyor to run forwards when detecting that a main belt has material flow, and then calculating the forward running speed of the two-way weighing belt conveyor and the running speed of a division belt conveyor according to actual sampling working parameters; recording the weight of all the coal samples again when the coal samples fall to the two-way weighing belt conveyor, obtaining the time for continuous forward operation according to the weight at the moment, and after the time is up, comparing the weight of the two-way weighing belt conveyor with the weight of the two-way weighing belt conveyor during no load to judge whether the two-way weighing belt conveyor needs to operate reversely for material cleaning or not; and the reverse running time is controlled according to the length of the bidirectional weighing belt conveyor. According to the method, forward transportation and reverse automatic cleaning of the bidirectional weighing belt conveyor are combined, and accurate speed and time control is carried out, so that blockage accumulation in coal flow sampling transportation is effectively prevented.

Description

Technical Field

[0001] This invention relates to an anti-blocking control method for a fully automated coal flow sampling and transportation system, belonging to the technical field of sampling of flowing or falling materials (G01N1 / 00). Background Technology

[0002] Coal is one of the main raw materials for industries such as metallurgy, power generation, and coal chemicals. Upon arrival at the plant, coal must be sampled and tested to determine if it meets contractual requirements. Currently, mobile coal flow sampling (belt conveyor) is the most common and simplest sampling method.

[0003] Coal prices are influenced not only by market factors but also by their composition and particle size. To reduce costs, companies often focus solely on composition during coal procurement, neglecting particle size to obtain more economical prices. However, large coal lumps entering fully automated coal sampling and transportation systems can easily cause blockages, requiring manual intervention. This can disrupt sampling of the current batch and subsequent batches of coal entering the plant, potentially leading to sample mixing and even serious quality incidents.

[0004] Therefore, there is an urgent need for a blockage control method for a fully automated coal flow sampling and transportation system to solve the blockage problem, thereby eliminating blockage failures, saving manual processing time, and ensuring the representativeness of the samples. Summary of the Invention

[0005] The technical problem this invention aims to solve is: how to resolve material blockage during fully automated coal flow sampling and transportation.

[0006] The technical solution proposed by this invention to solve the above-mentioned technical problems is: a method for preventing blockage in a fully automated coal flow sampling and transportation system, comprising the following steps: Step 1: Record the displayed weight M1 of the bidirectional weighing belt conveyor when unloaded; Step 2: When material flow is detected on the main belt, start the splitting belt conveyor, splitter, crusher, bidirectional weighing belt conveyor in forward operation, and material conveyor in sequence; Step 2.1: Control the bidirectional weighing belt conveyor to operate at the forward running speed V1 calculated according to formula (1). V1=(Q×90%) / (S×ρ) (1); In equation (1), Q is the maximum amount of coal that the crusher can process per unit time; S is the known cross-sectional area of ​​the coal sample after it has been shaped by the flow restrictor; and ρ is the natural bulk density of the sampled coal. Step 2.2: Control the speed V2 of the splitting belt conveyor as calculated by formula (2) to run. V2: V1=1: (1.5~2.0) (2); Step 3: Pour the coal sample collected for the first time into the unloading hopper. The coal sample falls from the unloading hopper to the conveyor belt, and then is conveyed by the conveyor belt to the bidirectional weighing belt. Step 3.1: After all coal samples have fallen onto the bidirectional weighing conveyor belt, the bidirectional weighing conveyor belt stops, and the displayed weight M2 of the bidirectional weighing conveyor belt is recorded at this time; Step 4: Restart the bidirectional weighing conveyor belt and continue running in the forward direction. When the bidirectional weighing conveyor belt continues to run in the forward direction until time T1, stop. Time T1 is calculated according to formula (3). T1= (M2-M1) / (V1×S×ρ)+ L1 / V1+ (10~15) (3); In equation (3), L1 is the known distance from the material drop point of the bidirectional weighing belt conveyor to the feed inlet of the crusher; Step 4.1: Record the displayed weight M3 when the bidirectional weighing belt conveyor continues to run in the forward direction until it stops at T1; Step 4.2: If M3-M1 > 1.5kg, the bidirectional weighing belt conveyor starts to run in reverse, and the reverse running speed V3 of the bidirectional weighing belt conveyor is controlled according to the following formula (4). V3: V1=(1.2~1.5) (4); After the bidirectional weighing conveyor belt reverses for time T2, all equipment stops and waits for the next coal sample to be collected; time T2 is calculated according to formula (5). T2 = L2 / 2V3 + 10; (5) In equation (5), L2 is the length of the bidirectional weighing belt conveyor; Step 4.3: If M3-M1≤1.5kg, all equipment shall be shut down and the coal sample shall be collected next. Step 5: Repeat steps 1-4 until all coal samples have been collected and transported. Step 6: When transporting the coal sample for the last time, the bidirectional weighing belt conveyor continues to run forward until T1, then is forced to run in reverse. After running in reverse until T2, all equipment stops.

[0007] Furthermore, when the bidirectional weighing conveyor belt is running in the forward direction, the coal sample is conveyed by the bidirectional weighing conveyor belt at a speed of V1, and after being shaped by the flow restrictor, it falls to the crusher, and after being crushed by the crusher, it falls to the reducing conveyor belt, and then is conveyed by the reducing conveyor belt at a speed of V2 to be reduced by the reducing device; the reduced coal sample falls to the sample collector; the unreduced coal sample is conveyed by the reducing conveyor belt at a speed of V2 to the secondary main conveyor belt.

[0008] Furthermore, when the bidirectional weighing belt conveyor is running in reverse, the coal sample is conveyed in reverse at a speed of V3 to the reducing belt conveyor, and then conveyed at a speed of V2 to the secondary main conveying belt conveyor.

[0009] The beneficial effects of this invention are as follows: By comprehensively considering the maximum processing capacity of the crusher per unit time, the cross-sectional area of ​​the coal sample after being shaped by the flow restrictor, and the natural bulk density of the sampled coal, the forward running speed of the bidirectional weighing conveyor is precisely controlled, thereby significantly reducing material blockage during the automatic coal flow sampling and transportation process. This ensures that the particle size and representativeness of the sample meet the testing requirements and also guarantees the high efficiency of the sampling process. Furthermore, by using the weight change on the bidirectional weighing conveyor as the basis for determining the automatic clearing of blockages during reverse operation, coupled with a relatively precise speed ratio, the reverse clearing effect of the bidirectional weighing conveyor is improved, effectively avoiding coal residue during the clearing process, ensuring the representativeness and reliability of the coal flow sampling, and also reducing equipment failures and the time required for manual troubleshooting. In summary, by combining forward transportation and automatic reverse clearing of the bidirectional weighing conveyor, and with precise speed and time control, material blockage and accumulation during coal flow sampling and transportation are effectively prevented. Detailed Implementation Example

[0010] This embodiment of a fully automated coal flow sampling and transportation system includes the following steps: Step 1: Record the displayed weight of the bidirectional weighing belt conveyor when unloaded, M1 = 253.36 kg.

[0011] Step 2: When material flow is detected on the main belt, start the splitting belt conveyor, splitter, crusher, bidirectional weighing belt conveyor in forward operation, and material conveyor in sequence; Step 2.1: Control the bidirectional weighing belt conveyor to operate at the forward running speed V1 calculated according to formula (1). V1=(Q×90%) / (S×ρ) (1); In equation (1), the maximum amount of coal that the crusher can process per unit time is Q = 2000 g / s; the known cross-sectional area of ​​the coal sample after being shaped by the flow restrictor is S = 130 cm². 2 The natural bulk density of the sampled coal is ρ = 1.6 g / cm³. 3 ; In this embodiment, V1 = 8.65 cm / s is calculated according to formula (1); Step 2.2: Control the speed V2 of the split conveyor belt as calculated by formula (2) to run. V2: V1=1: (1.5~2.0) (2); In this embodiment, V2:V1=1.6, and V2=13.85 cm / s is calculated.

[0012] Step 3: Pour the coal sample collected for the first time into the unloading hopper. The coal sample falls from the unloading hopper to the conveyor belt, and then is conveyed by the conveyor belt to the bidirectional weighing belt. Step 3.1: After all the coal samples have fallen onto the bidirectional weighing conveyor belt, the bidirectional weighing conveyor belt stops and the displayed weight M2 = 288.76 kg is recorded.

[0013] Step 4: Restart the bidirectional weighing conveyor belt and continue running in the forward direction. When the bidirectional weighing conveyor belt continues to run in the forward direction until time T1, stop. Time T1 is calculated according to formula (3). T1=(M2-M1) / (V1×S×ρ)+ L1 / V1+(10~15) (3); In equation (3), the known distance L1 from the material drop point of the bidirectional weighing belt conveyor to the feed inlet of the crusher is 1.5m; In this embodiment, T1 = 193s is calculated according to formula (3); Coal samples are conveyed forward at speed V1 by a bidirectional weighing belt conveyor, shaped by a flow restrictor, and then fall to the crusher. After being crushed by the crusher, the samples fall to the reducing belt conveyor and are then conveyed at speed V2 through the reducing device for further reduction. The reduced coal samples fall to the sample collector. The unreduced coal samples are conveyed at speed V2 by the reducing belt conveyor to the secondary main conveyor belt conveyor. Step 4.1: Record the displayed weight M3 = 263.48 kg when the bidirectional weighing belt conveyor continues to run in the forward direction until it stops at T1; In this embodiment, M3-M1=10.12kg>1.5kg; Step 4.2: If M3-M1 > 1.5kg, the bidirectional weighing belt conveyor starts to run in reverse, and the reverse running speed V3 of the bidirectional weighing belt conveyor is controlled according to the following formula (4). V3: V1=(1.2~1.5) (4); In this embodiment, V3:V1=1.4, and V3=12.12cm / s is calculated according to formula (4); The coal sample is conveyed in reverse at a speed of V3 by a bidirectional weighing belt conveyor to a reducing belt conveyor, and then conveyed at a speed of V2 by the reducing belt conveyor to the secondary main conveyor belt conveyor. After the bidirectional weighing conveyor belt reverses for time T2, all equipment stops and waits for the next coal sample to be collected; time T2 is calculated according to formula (5): T2 = L2 / 2V3 + 10; (5); In equation (5), the length of the bidirectional weighing belt conveyor is L2 = 2.2m; In this embodiment, L2 = 101s is calculated according to formula (5); Step 4.3: If M3-M1≤1.5kg, all equipment shall be shut down and the coal sample shall be collected for the next sampling.

[0014] Step 5: Repeat steps 1-4 until all coal samples have been collected and transported.

[0015] Step 6: When transporting the coal sample for the last time, the bidirectional weighing conveyor belt continues to run forward until T1, then is forced to run in reverse. After running in reverse until T2, all equipment stops.

[0016] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for preventing blockage in a fully automated coal flow sampling and transportation system, characterized in that... Includes the following steps: Step 1: Record the displayed weight M1 of the bidirectional weighing belt conveyor when unloaded; Step 2: When material flow is detected on the main belt, start the splitting belt conveyor, splitter, crusher, bidirectional weighing belt conveyor in forward operation, and material conveyor in sequence; Step 2.1: Control the bidirectional weighing belt conveyor to operate at the forward running speed V1 calculated according to formula (1). V1=(Q×90%) / (S×ρ) (1); In equation (1), Q is the maximum amount of coal that the crusher can process per unit time; S is the known cross-sectional area of ​​the coal sample after it has been shaped by the flow restrictor; and ρ is the natural bulk density of the sampled coal. Step 2.2: Control the speed V2 of the split conveyor belt as calculated by formula (2) to run. V2: V1=1: (1.5~2.0) (2); Step 3: Pour the coal sample collected for the first time into the unloading hopper. The coal sample falls from the unloading hopper to the conveyor belt, and then is conveyed by the conveyor belt to the bidirectional weighing belt. Step 3.1: After all coal samples have fallen onto the bidirectional weighing conveyor belt, the bidirectional weighing conveyor belt stops, and the displayed weight M2 of the bidirectional weighing conveyor belt is recorded at this time; Step 4: Restart the bidirectional weighing conveyor belt and continue running in the forward direction. When the bidirectional weighing conveyor belt continues to run in the forward direction until time T1, stop. Time T1 is calculated according to formula (3). T1= (M2-M1) / (V1×S×ρ)+ L1 / V1+ (10~15) (3); In equation (3), L1 is the known distance from the material drop point of the bidirectional weighing belt conveyor to the feed inlet of the crusher; Step 4.1: Record the displayed weight M3 when the bidirectional weighing belt conveyor continues to run in the forward direction until it stops at T1; Step 4.2: If M3-M1 > 1.5kg, the bidirectional weighing belt conveyor starts to run in reverse, and the reverse running speed V3 of the bidirectional weighing belt conveyor is controlled according to the following formula (4). V3: V1 = (1.2~1.5) (4); After the bidirectional weighing conveyor belt reverses for time T2, all equipment stops and waits for the next coal sample to be collected; time T2 is calculated according to formula (5): T2 = L2 / 2V3 + 10; (5); In equation (5), L2 is the length of the bidirectional weighing belt conveyor; Step 4.3: If M3-M1≤1.5kg, all equipment shall be shut down and the coal sample shall be collected next. Step 5: Repeat steps 1-4 until all coal samples have been collected and transported. Step 6: When transporting the coal sample for the last time, the bidirectional weighing belt conveyor continues to run forward until T1, then is forced to run in reverse. After running in reverse until T2, all equipment stops.

2. The anti-blocking control method for the fully automated coal flow sampling and transportation system according to claim 1, characterized in that: When the bidirectional weighing conveyor belt is running in the forward direction, the coal sample is conveyed by the bidirectional weighing conveyor belt at a speed of V1, and after being shaped by the flow restrictor, it falls to the crusher. After being crushed by the crusher, it falls to the reducing conveyor belt, and then is conveyed by the reducing conveyor belt at a speed of V2 and reduced by the reducing device. The reduced coal sample falls to the sample collector. The unreduced coal sample is conveyed by the reducing conveyor belt at a speed of V2 to the secondary main conveyor belt.

3. The anti-blocking control method for the fully automated coal flow sampling and transportation system according to claim 1, characterized in that: When the bidirectional weighing belt conveyor is running in reverse, the coal sample is conveyed in reverse at a speed of V3 to the reducing belt conveyor, and then conveyed at a speed of V2 to the secondary main conveying belt conveyor.