Material belt cooling water spraying system and method

Abstract

This invention relates to the field of belt conveyor water spraying, and more particularly to a material belt cooling water spraying system and method. The main water supply pipe is equipped with a flow regulating solenoid valve; a first spray unit and a second spray unit are sequentially and alternately arranged above the belt conveyor direction; the first spray unit is equipped with a temperature sensing unit; the spray pipe is a perforated pipe with multiple rows of spray holes along the axial direction on the pipe wall. The spray holes are inverted conical holes with a small inner diameter and a large outer diameter. The advantages of this invention are: the structure of directly machining inverted conical spray holes on a straight pipe results in a smooth conical hole that gradually increases in size from the inside out. The spray is directly ejected at high speed from the high-pressure zone inside the pipe, eliminating the formation of eddies and low-speed stagnation within the channel. Impurities have no basis for retention or adhesion, and are less prone to deposition and blockage. A single perforated pipe can replace an entire row of traditional nozzles, solving the clogging problem at its source and reducing procurement and long-term maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of belt spraying water, and more particularly to a material belt cooling water spraying system and method. Background Technology

[0002] In industries such as metallurgy, power generation, and building materials, high-temperature solid materials (such as sintered ore, hot coke, and high-temperature slag) are often transported via belt conveyors. During transport, the surface temperature of these materials often reaches several hundred degrees Celsius. If not cooled promptly, they can easily cause thermal burns and aging to the rubber conveyor belts, significantly shortening their lifespan and increasing equipment maintenance costs. More seriously, the high-temperature materials may ignite the belts or combustible dust generated during transport, posing a significant fire hazard. Furthermore, the entry of overheated materials into subsequent screening, crushing, or storage processes can also affect process stability and equipment safety.

[0003] Currently, the most common belt cooling method used in the industry is to install a spray device above the conveyor to achieve evaporative cooling by spraying water onto the surface of high-temperature materials. A typical existing technical solution involves arranging multiple independent nozzles (spray heads) at intervals along the belt direction. Each nozzle is connected to the main water supply pipe via a branch pipe and equipped with a solenoid valve for on / off control. When the temperature sensing element detects high-temperature materials, the solenoid valve is opened, and water is atomized through the nozzles or sprayed onto the materials in the form of a water curtain.

[0004] However, this type of spray system based on independent nozzles has the following inherent drawbacks: 1. Prone to clogging, poor reliability, and high maintenance requirements: The internal flow channels of nozzles are typically complex and narrow. In harsh industrial environments, dust from materials can easily enter the spray water system with the airflow, or the water itself may contain impurities. These impurities easily accumulate in the narrow nozzle channels, leading to partial or complete clogging. Clogging causes uneven water spraying, discontinuous water curtains, or even complete failure, resulting in a loss of cooling effect. Solving clogging problems requires frequent cleaning and maintenance, increasing workload, affecting production continuity, and reducing system reliability.

[0005] 2. High system cost: To achieve basic coverage along the width and length of the belt, a large number of nozzles are often required. The unit price of each precision nozzle is high, and coupled with a large number of connecting pipes and valves, the initial investment cost of the entire sprinkler system is high.

[0006] 3. Multiple leakage risk points: Each nozzle itself and its connection point with the pipeline are potential leakage points. The arrangement of a large number of nozzles means that the overall leakage risk of the system is significantly increased, which not only wastes water resources, but may also affect on-site equipment and the environment.

[0007] 4. Insufficient freeze protection: In northern regions or areas with cold winters, traditional branched water supply systems have significant drawbacks. When the system is not in operation, stagnant water remains at the ends of branch pipes and in nozzles, making it highly susceptible to freezing. Freeze-thaw forces can cause pipes, valves, or nozzles to crack, damaging the system and preventing it from functioning properly when restarted.

[0008] 5. Cooling Delay and Blind Spot: Existing control methods are typically simple, often involving a single spray zone located after the temperature measuring point. When the measuring point detects a high-temperature material signal, the controller then opens the solenoid valve. Due to the hydraulic delay (i.e., pipeline filling time) between valve opening and the formation of a stable and effective water curtain at the end of the pipeline, the first high-temperature material to arrive passes through the spray zone before receiving sufficient cooling, creating a "cooling blind spot." This uncooled material still poses a threat to the downstream area of ​​the conveyor belt, resulting in incomplete protection. Summary of the Invention

[0009] The purpose of this invention is to provide a material conveyor belt cooling water spray system and method. By replacing traditional nozzles with perforated pipes with inverted conical spray holes, the blockage problem is fundamentally solved structurally. By constructing a ring pipeline connecting the plant's circulating water supply and return water and cooperating with regulating valves, the system can switch between standby antifreeze and high-flow spray, completely eliminating the risk of freezing. By setting up dual spray units spaced along the conveyor belt flow direction and timing control logic, the system ensures that high-temperature materials are covered by a timely and continuous water curtain from head to tail, achieving full-coverage and efficient cooling without delay or blind spots.

[0010] To achieve the above objectives, the present invention provides the following technical solution: A material conveyor belt cooling water spray system includes: a ring-shaped water supply pipeline, a first spray unit, and a second spray unit. The ring-shaped water supply pipeline includes a main water supply pipe (20), one end of which is connected to a circulating water supply network (30); the other end of which is connected to a circulating return water network (40). A flow regulating solenoid valve (50) is provided on the main water supply pipe (20). One end of the flow regulating solenoid valve (50) is connected to the input end of the first spray unit, and the other end of the flow regulating solenoid valve (50) is connected to the input end of the second spray unit. The first spray unit and the second spray unit are arranged sequentially and alternately above the conveying direction of the belt (100); The first spray unit is equipped with a temperature sensing unit (3); The temperature sensing unit (3) and the flow regulating solenoid valve (50) are respectively connected to the control unit; Both the first spray unit and the second spray unit include a spray pipe (10), and the spray pipe (10) is a ring-shaped water supply pipeline; The spray pipe (10) is a perforated pipe with multiple rows of spray holes (11) along the axial direction on the pipe wall. The spray holes (11) are inverted conical holes with small inner diameter and large outer diameter.

[0011] The first spray unit is connected to the main water supply pipe (20) through a branch pipe (21) and is located at the first node at one end of the flow regulating solenoid valve (50); The second spray unit is connected to the main water supply pipe (20) via branch pipe two (22) and is located at the second node on the other end of the flow regulating solenoid valve (50).

[0012] The nozzles (11) are distributed in multiple rows in the lower semicircular area of ​​the spray pipe (10), and the nozzles (11) in adjacent rows are staggered in the axial direction.

[0013] The distance between the first spray unit and the second spray unit along the belt (100) is 8-12 meters.

[0014] The inner wall diameter (d1) of the inverted conical nozzle (11) is 2-4 mm, and the outer wall diameter (d2) is 4-6 mm.

[0015] One end of the flow regulating solenoid valve (50) is also connected to one end of the corresponding spray pipe (10) through a branch pipe (21), and a switch solenoid valve (5) is provided on the branch pipe (21). The other end of the flow regulating solenoid valve (50) is also connected to one end of the corresponding spray pipe (10) through a branch pipe two (22), and a switch solenoid valve two (6) is provided on the branch pipe two (22). Solenoid valve 1 (5) and solenoid valve 2 (6) are respectively connected to the control unit; The control unit is a PLC.

[0016] The material conveyor belt cooling water spray method, based on PLC, includes: S1. Standby antifreeze; The flow regulating solenoid valve (50) is in a small opening, so that the antifreeze circulating water flow from the circulating water supply network (30) and the circulating return water network (40) is maintained in the annular water supply pipeline, and the front end of the switching solenoid valve one (5) and the switching solenoid valve two (6) are kept under pressure. S2, Temperature Monitoring; The temperature of the material on the belt (100) is monitored in real time using the temperature sensing unit (3); S3, Sprayer start; When the temperature sensing unit (3) detects that the material temperature exceeds the high temperature alarm threshold, it simultaneously opens the first switching solenoid valve (5) and the second switching solenoid valve (6), and switches the flow regulating solenoid valve (50) to full opening. S4, Delayed shutdown; The second solenoid valve (6) closes after a preset opening time; S5, continued cooling; The solenoid valve 1 (5) remains open to continuously spray and cool the material. S6. Spraying stops; When the temperature sensing unit (3) detects that the material temperature has dropped below the safety threshold, P closes the solenoid valve 1 (5); the flow regulating solenoid valve (50) is reset to the small opening.

[0017] The preset time is 5-10 seconds.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Existing technologies use independent nozzles with complex structures and narrow flow channels, which are easily clogged by impurities in the water or on-site dust, leading to spray failure. This requires frequent manual cleaning, resulting in a large workload and impacting production. This invention abandons traditional nozzles and adopts a structure where inverted conical spray holes are directly machined on a straight pipe. The flow channel is extremely simple, consisting of a smooth conical hole that gradually increases in size from the inside out. The water flow direction is clear, and the water is sprayed directly at high speed from the high-pressure zone inside the pipe. There is no structure that generates eddies or low-speed stagnation within the channel, so impurities have no basis for staying or adhering. This simple and smooth flow channel, without complex cavities, makes it difficult for impurities to accumulate and get stuck. Even if there is slight scale, it is easily removed by the water flow. A single perforated pipe can replace an entire row of traditional nozzles, which not only solves the clogging problem at the source but also greatly reduces procurement costs (low material costs) and long-term maintenance costs, fundamentally improving the reliability of the system. 2. Traditional branch-type water supply systems create "dead water zones" at the ends of branch pipes when not in operation, which are prone to freezing in cold winters, leading to pipe and valve cracking and system failure. This invention designs the water supply pipeline as a ring structure connecting the plant's circulating supply and return water network, and with the regulating valve on the main water supply pipe, the regulating valve maintains a small opening when in standby mode, allowing water to flow continuously and slowly throughout the ring pipeline, forming a "dynamic anti-freeze circulation." This ensures that there is no stagnant water in any part, fundamentally eliminating the risk of pipe freezing. It is particularly suitable for industrial sites in northern or cold regions, ensuring the system's availability 24 / 7 throughout the year. 3. Traditional single-point spray systems suffer from a hydraulic delay of "detection-response-spraying," causing the first arriving high-temperature material to pass through before forming an effective water curtain, creating a cooling blind zone that still poses a threat to downstream conveyor belts. This invention employs a strategy of "dual spray units at the front and rear + timing control." When high-temperature material is detected, both downstream spray units are activated simultaneously. The second downstream spray unit is activated briefly (e.g., 5-10 seconds) to cover the "time window" and spatial interval where the first upstream spray unit fails to function effectively due to the hydraulic delay. This design ensures continuous and timely water curtain coverage throughout the entire conveying path, from the head to the tail of the high-temperature material, achieving true 100% blind-zone-free cooling and providing more thorough and safer protection for the conveyor belt. 4. Significant water saving: The downstream second spray unit is only turned on for a short time, while the upstream first spray unit is controlled in a closed loop according to the real-time temperature of the material (it stops when the safe temperature is reached); This linkage mode of "main continuous and auxiliary short time" minimizes unnecessary spraying time and water consumption while ensuring the absolute cooling effect, reflecting the design concept of energy saving and environmental protection. 5. Avoid "short-flow" interference to the plant's water pipe network: By precisely controlling the opening of the regulating valve on the main loop pipe through the program, in the standby anti-freeze mode, it is maintained at a small opening (such as 15%-30%) that ensures flow while generating sufficient resistance. This cleverly achieves "micro-circulation anti-freeze". At the same time, due to its high flow resistance, it effectively limits the bypass flow through this system, avoiding significant "short-flow" impact on the hydraulic conditions of the plant's main circulation pipe network. This ensures the normal water pressure and flow of other equipment in the same pipe network, allowing this system to be integrated into the existing plant infrastructure in a friendly and stable manner. 6. Simplified system structure, easy installation and maintenance: Perforated pipes replace a large number of precision nozzles, significantly reducing the material cost and procurement cost of core components; fewer pipe connection points reduce the risk of leakage and the complexity of installation and maintenance; high reliability reduces unplanned downtime and maintenance frequency, reducing the total life cycle operating cost; anti-freeze design avoids equipment damage and repair costs caused by freezing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a material conveyor belt cooling water spray system.

[0020] Figure 2 This is a schematic diagram of a partial cross-sectional structure of the spray pipe.

[0021] Figure 3 yes Figure 2 A sectional view along line AA.

[0022] Figure 4 yes Figure 3 Enlarged view of Part I.

[0023] Figure 5 This is a system diagram of the water supply pipeline.

[0024] Figure 6 This is a flowchart of a material conveyor belt cooling and water spraying method.

[0025] In the diagram: 1. First spray unit; 2. Second spray unit; 3. Temperature sensor; 4. Control unit; 5. Solenoid valve 1; 6. Solenoid valve 2; 10. Spray pipe; 11. Spray hole; 20. Main water supply pipe; 21. Branch pipe 1; 22. Branch pipe 2; 30. Circulating water supply network; 40. Circulating return water network; 50. Flow regulating solenoid valve; 100. Belt. Detailed Implementation

[0026] 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.

[0027] 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. Example 1

[0028] A material conveyor cooling water spray system and method are applied to the hot sinter conveyor belt after the sintering process in a steel plant. (See below) Figure 1-5 .

[0029] I. System Structure and Installation; 1. Belt parameters: The width of the conveyor belt (100) is B=1600mm, the belt speed is v=1.6m / s, the maximum designed conveying capacity is Q=1200t / h, and the discharge temperature of sintered ore is usually 400-600℃.

[0030] 2. Sprayer unit layout: On the belt conveyor frame, the first spray unit (1) and the second spray unit (2) are installed sequentially along the material conveying direction. The centerline distance L1 between the first spray unit (1) and the second spray unit (2) is set to 10 meters to accommodate the belt running speed and the system response time. About 2.5 meters upstream of the first spray unit (1), a non-contact infrared thermometer (3) is installed as a temperature sensing unit, with its monitoring point aligned with the center of the belt bearing surface.

[0031] 3. Spray pipe design: Each spray unit uses two parallel spray pipes (10). The spray pipe (10) is a DN40 (outer diameter approximately 48mm) 304 stainless steel pipe; Each pipe has two rows of spray holes (11) axially arranged in a 120° fan-shaped area at its lower part. The nozzle (11) is machined into an inverted cone shape using a drilling machine. The inner wall diameter d1 is 3mm, the outer wall diameter d2 is 5mm, and the cone angle is approximately 60°. The basic axial spacing P between the two rows of spray holes is 200mm, and the spray holes in adjacent rows are staggered by 100mm along the axial direction to ensure that the water spray coverage is seamless.

[0032] Working principle: Small entrance (d1): Under the action of water pressure inside the pipe, the water flows into the small-diameter end of the nozzle at a high speed; High-speed water flow has a strong self-cleaning flushing effect on the inlet, which can prevent impurities from adhering to the inlet.

[0033] Large exports (d2): The flow channel gradually widens, forming a gradually widening section; According to Bernoulli's principle, when water flows from a narrow point to a wide point, the flow velocity decreases and the dynamic pressure is converted into static pressure. This gradually expanding structure ensures that the water flow is diffused and smooth as it leaves the nozzle, rather than contracting and jetting.

[0034] Preventing air trapping and preventing scale buildup: When using traditional small-hole jetting, local low pressure can easily form at the orifice, which may draw in air or cause microbubbles to be released from the water, accelerating the adhesion of impurities. The gradually expanding structure of the inverted conical orifice helps stabilize pressure and reduce such problems; Even if a small amount of scale begins to form, because it adheres to the gradually expanding cone surface, the direction of the fluid shear force it experiences is to push it outwards, rather than getting stuck in a narrow place, and it is easily washed away by the subsequent water flow.

[0035] 4. Water supply pipeline: The main water supply pipe (20) is made of DN80 seamless steel pipe. One end of it is connected to the clean loop water supply network (30) of the plant area (pressure 0.4MPa), and the other end is connected to the clean loop water return network (40). A DN80 electric regulating valve is installed on the main water supply pipe (20) as a regulating solenoid valve (50).

[0036] 5. Branch connection: Branch pipe 1 (21) and branch pipe 2 (22) are respectively led out from the two nodes of the flow regulating solenoid valve (50) on the main water supply pipe (20) (both use DN50 steel pipes); On each branch pipe, a manual butterfly valve (31 / 34), a Y-type filter (32 / 35, filter screen diameter 2mm), a check valve (33 / 36), and a normally closed solenoid valve (5 / 6, response time <1 second) are installed in sequence along the water flow direction. Finally, they are connected to the inlet end of the spray pipe (10) of the corresponding spray unit through a flange.

[0037] 6. Control system: A Siemens S7-1200 series PLC was used as the control unit (4); The PLC receives the 4-20mA temperature signal from the non-contact infrared thermometer (3) and outputs control signals to the flow regulating solenoid valve (50), the first switching solenoid valve (5), and the second switching solenoid valve (6).

[0038] II. Control parameters and workflow, see Figure 6 : 1. Temperature threshold setting: High temperature alarm threshold T high Set to 350℃; safe temperature threshold T low Set to 90℃.

[0039] 2. Standby anti-freeze mode: When the non-contact infrared thermometer (3) detects a temperature below T for 10 consecutive seconds high At that time, the system determined that there were no high-temperature materials.

[0040] The PLC controls the flow regulating solenoid valve (50) to maintain its opening at 20%; At this time, the clean circulating water flows from the circulating water supply network (30) through the main water supply pipe (20) and the small-opening flow regulating solenoid valve (50) back to the clean circulating water return network (40), forming a micro-circulation; This circulation flow rate is approximately 2-3 m³ / h, which is sufficient to prevent water from freezing at any point in the pipeline, and its impact on the pressure drop of the main pipeline is less than 1%, which can be ignored. Solenoid valve 1 (5) and solenoid valve 2 (6) remain closed, but the pipes upstream of their valves are filled with pressurized circulating water.

[0041] 3. High-temperature spray mode: When the non-contact infrared thermometer (3) detects that the material temperature instantly exceeds 350℃, the PLC immediately (response time <100ms) executes two commands simultaneously: ① Instantly increase the opening command of the flow regulating solenoid valve (50) from 20% to 100% (fully open); ② Simultaneously open solenoid valve one (5) and solenoid valve two (6); At this time, the resistance of the ring pipeline is at its minimum, and the water supply flow rate rapidly increases to about 60 m³ / h. The first spray unit (1) and the second spray unit (2) simultaneously spray out dense and uniform water curtains to cover the entire belt surface.

[0042] 4. Delayed shutdown and continuous cooling: The second solenoid valve (6) is automatically closed by the PLC 8 seconds after it is opened; The second spray unit (2) stops spraying water; The 8-second time covers the hydraulic delay (approximately 1-2 seconds) from the opening of the solenoid valve of the first spray unit (1) to the formation of a stable water curtain, as well as the time required for the head of the high-temperature material to pass through the interval area (10 meters / 1.6 m / s ≈ 6.25 seconds) between the first spray unit (1) and the second spray unit (2), ensuring no cooling blind spots; The first spray unit (1) continues to spray water to continuously cool the material.

[0043] 5. Sprayer Stop and System Reset: The non-contact infrared thermometer (3) continuously monitors the temperature of the material after spraying; When the temperature drops below 90°C and stabilizes for 3 seconds, the PLC closes the solenoid valve 1 (5) and stops the spraying. Subsequently, the PLC restores the opening command of the flow regulating solenoid valve (50) to 20%, and the system re-enters the standby anti-freeze mode, waiting for the next trigger. Example 2

[0044] A material conveyor belt cooling water spray system and method are applied to a simplified system for high-temperature slag conveyor belts in coal-fired power plants, specifically for slag conveyor belts in a power plant in southern China where the operating conditions are relatively mild and there is no extreme cold in winter.

[0045] I. System Structure and Installation (Simplified): 1. Operating parameters: The belt width B = 1000mm, the belt speed v = 1.0m / s, and the slag temperature is usually 200-400℃.

[0046] 2. Sprayer unit layout: Only one spray unit is set up, namely the first spray unit (1), but it is regarded as an integration of the functions of the first and second spray units in Embodiment 1. A non-contact infrared thermometer (3) is installed 3 meters upstream of it.

[0047] 3. Spray pipe design: A single DN32 316L stainless steel pipe is used as the spray pipe (10). A single row of spray holes (11) is machined in the lower 150° fan-shaped area. The holes are straight holes with a diameter of 4 mm and a spacing of 150 mm. This simplified design is suitable for applications where the requirements for cooling uniformity are slightly lower and the slag temperature is relatively low.

[0048] 4. Water supply pipeline: The loop design is still adopted. The main water supply pipe (20) is DN50, and its two ends are connected to the water supply header and return header of the industrial water system in the plant area, respectively. A DN50 two-position (on / off) electric ball valve is installed on the main water supply pipe (20) as a flow regulating solenoid valve (50).

[0049] 5. Branch connection: A DN32 branch pipe (21) is led out from one side node of the flow regulating solenoid valve (50). A manual gate valve, a simple filter, a check valve and a switch solenoid valve (5) are installed on the branch pipe in sequence, and then the spray pipe (10) is connected.

[0050] 6. Control system: A Siemens S7-1200 series PLC was used as the control unit (4).

[0051] II. Control Parameters and Workflow (Simplified Logic): 1. Temperature threshold setting: T high =250℃, T low =70℃.

[0052] 2. Standby anti-freeze mode: When the temperature is below T high At this time, the PLC controls the flow regulating solenoid valve (50) to be completely closed; Since winter temperatures in the south rarely drop below 0°C, and the pipes have insulation layers, the need for freeze protection is not prominent. At this time, the system is in a completely standby state, and the water in branch pipe 1 (21) is static pressure water.

[0053] This embodiment mainly demonstrates the system's advantages in "anti-blocking" and "instant response".

[0054] 3. High-temperature spray mode: When the temperature exceeds 250℃, the PLC immediately opens the flow regulating solenoid valve (50) (from closed to fully open) and the switching solenoid valve (5) simultaneously. As the flow regulating solenoid valve (50) is fully open, the ring pipeline is connected, and the water flow from the circulating water supply network (30) and the circulating return water network (40) can be quickly replenished, and the spray pipe (10) starts spraying water with almost no delay.

[0055] Because the slag temperature is relatively low and the specific heat capacity is small, single-point spraying can meet the cooling requirements.

[0056] 4. Spraying stops: When the thermometer detects that the temperature is below 70℃, the PLC simultaneously closes the flow regulating solenoid valve (50) and the switching solenoid valve (5). The system is reset to standby mode.

[0057] Existing technologies employ complex, narrow-channel independent nozzles, which are easily clogged by impurities in the water or on-site dust, leading to spray failure and requiring frequent manual cleaning, resulting in a large maintenance workload and impacting production. This invention abandons traditional nozzles, employing a structure where inverted conical spray holes are directly machined onto a straight pipe. The flow channel is extremely simple, consisting of a smooth conical hole that gradually increases in size from the inside out. The water flow direction is clear, spraying directly at high speed from the high-pressure zone inside the pipe. There are no eddies or low-speed stagnation structures within the channel, eliminating the basis for impurities to remain or adhere. This simple, smooth flow channel, without complex cavities, prevents impurities from easily accumulating and becoming stuck. Even with slight scale buildup, the water flow... It is also easy to detach under flushing, and a single perforated pipe can replace an entire row of traditional nozzles. This not only solves the clogging problem at its source but also greatly reduces procurement costs (low material costs) and long-term maintenance costs, fundamentally improving the reliability of system operation. In traditional branched water supply systems, "dead water zones" form at the ends of branch pipes when not in operation, which are prone to freezing in cold winters, causing pipes and valves to freeze and crack, preventing the system from starting. This invention designs the water supply pipeline as a ring structure connecting the plant's circulating supply and return water network, and with the regulating valve on the main water supply pipe, the regulating valve maintains a small opening when in standby mode, allowing water to flow continuously and slowly throughout the ring pipeline, forming a "dynamic anti-freeze circulation." The "ring" design ensures that there is no stagnant water in any part of the pipeline, fundamentally eliminating the risk of pipe freezing. It is particularly suitable for industrial sites in northern or cold regions, ensuring the system's availability 24 / 7. Traditional single-point spray systems suffer from hydraulic delays in the "detection-response-spraying" process, causing the first arriving high-temperature materials to pass through before forming an effective water curtain, creating a cooling blind zone that still poses a threat to downstream conveyor belts. This invention employs a strategy of "dual spray units at the front and rear + timing control." When high-temperature materials are detected, the two downstream spray units are activated simultaneously. The second downstream spray unit is activated briefly (e.g., 5-10 seconds) to cover the first upstream spray unit. The design eliminates the "time window" and spatial intervals that are not effectively utilized due to hydraulic delays. This ensures that the high-temperature material is continuously and promptly covered by a water curtain throughout the entire conveying path, from head to tail, achieving true 100% blind-spot-free cooling and providing more thorough and safer protection for the conveyor belt. Significant water savings are achieved: the downstream second spray unit is only activated briefly, while the upstream first spray unit operates in a closed-loop control based on the real-time material temperature (stopping once a safe temperature is reached). This "main continuous, auxiliary short-time" linkage mode minimizes unnecessary spraying time and water consumption while ensuring absolute cooling effect, embodying an energy-saving and environmentally friendly design philosophy.To avoid "short-flow" interference with the plant's water network: The opening of the regulating valve on the main loop pipe is precisely controlled by a program. In standby anti-freeze mode, it is maintained at a small opening (e.g., 15%-30%) that ensures flow while generating sufficient resistance. This cleverly achieves "micro-circulation anti-freeze." Simultaneously, due to its high flow resistance, it effectively limits the bypass flow through the system, avoiding significant "short-flow" impacts on the hydraulic conditions of the plant's main circulation network. This ensures normal water pressure and flow for other equipment within the same network, allowing the system to be seamlessly and stably integrated into the existing plant infrastructure. The system structure is simplified, facilitating installation and maintenance: Perforated pipes replace numerous precision nozzles, significantly reducing material costs and procurement expenses for core components; fewer pipe connection points reduce leakage risk and installation / maintenance complexity; high reliability reduces unplanned downtime and maintenance frequency, lowering overall lifecycle operating costs; and the anti-freeze design prevents equipment damage and repair costs caused by freezing.

Claims

1. A material conveyor belt cooling water spray system, characterized in that, include: The ring water supply pipeline includes a first spray unit and a second spray unit. The ring water supply pipeline includes a main water supply pipe (20), one end of which is connected to the circulating water supply network (30); the other end of which is connected to the circulating return water network (40). A flow regulating solenoid valve (50) is provided on the main water supply pipe (20). One end of the flow regulating solenoid valve (50) is connected to the input end of the first spray unit, and the other end of the flow regulating solenoid valve (50) is connected to the input end of the second spray unit. The first spray unit and the second spray unit are arranged sequentially and alternately above the conveying direction of the belt (100); The first spray unit is equipped with a temperature sensing unit (3); The temperature sensing unit (3) and the flow regulating solenoid valve (50) are respectively connected to the control unit; Both the first spray unit and the second spray unit include a spray pipe (10), and the spray pipe (10) is a ring-shaped water supply pipeline; The spray pipe (10) is a perforated pipe with multiple rows of spray holes (11) along the axial direction on the pipe wall. The spray holes (11) are inverted conical holes with small inner diameter and large outer diameter.

2. The material conveyor cooling water spray system according to claim 1, characterized in that, The first spray unit is connected to the main water supply pipe (20) through a branch pipe (21) and is located at the first node at one end of the flow regulating solenoid valve (50); The second spray unit is connected to the main water supply pipe (20) via branch pipe two (22) and is located at the second node on the other end of the flow regulating solenoid valve (50).

3. The material conveyor cooling water spray system according to claim 1, characterized in that, The spray holes (11) are distributed in multiple rows in the lower semicircular area of ​​the spray pipe (10), and the adjacent rows of spray holes (11) are staggered in the axial direction.

4. The material conveyor cooling water spray system according to claim 1, characterized in that, The first spray unit and the second spray unit are spaced 8-12 meters apart along the belt (100).

5. The material conveyor cooling water spray system according to claim 1, characterized in that, The inner wall diameter (d1) of the inverted conical spray hole (11) is 2-4 mm, and the outer wall diameter (d2) is 4-6 mm.

6. The material conveyor cooling water spray system according to claim 1, characterized in that, One end of the flow regulating solenoid valve (50) is also connected to one end of the corresponding spray pipe (10) through a branch pipe (21), and a switch solenoid valve (5) is provided on the branch pipe (21). The other end of the flow regulating solenoid valve (50) is also connected to one end of the corresponding spray pipe (10) through a branch pipe two (22), and a switch solenoid valve two (6) is provided on the branch pipe two (22). Solenoid valve 1 (5) and solenoid valve 2 (6) are respectively connected to the control unit; The control unit is a PLC.

7. A method for cooling and spraying water on a material conveyor belt using the system described in any one of claims 1-6, implemented using a PLC, characterized in that, include: S1. Standby antifreeze; The flow regulating solenoid valve (50) is in a small opening, so that the antifreeze circulating water flow from the circulating water supply network (30) and the circulating return water network (40) is maintained in the annular water supply pipeline, and the front end of the switching solenoid valve one (5) and the switching solenoid valve two (6) are kept under pressure. S2, Temperature Monitoring; The temperature of the material on the belt (100) is monitored in real time using the temperature sensing unit (3); S3, Sprayer start; When the temperature sensing unit (3) detects that the material temperature exceeds the high temperature alarm threshold, it simultaneously opens the first switching solenoid valve (5) and the second switching solenoid valve (6), and switches the flow regulating solenoid valve (50) to full opening. S4, Delayed shutdown; The second solenoid valve (6) closes after a preset opening time; S5, continued cooling; The solenoid valve 1 (5) remains open to continuously spray and cool the material. S6. Spraying stops; When the temperature sensing unit (3) detects that the material temperature has dropped below the safety threshold, P closes the solenoid valve 1 (5); the flow regulating solenoid valve (50) is reset to the small opening.

8. The material conveyor belt cooling water spraying method according to claim 7, characterized in that, The preset time is 5-10 seconds.

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