Coal mill safety detection method based on temperature and air pressure

Abstract

The invention discloses a coal mill safety detection method based on temperature and air pressure. The problem that in the prior art, the internal condition of the coal mill is detected mainly through a temperature detector and an air pressure detector, and numerical value detection is inaccurate after long-time use is solved. The method comprises the following steps that when temperature detection equipment and air pressure detection equipment give an alarm or a coal mill main body works for a long time, a motor stops working, so that the coal mill main body 1 stops working, then an operator unscrews a locking bolt, a fixing plate is pulled out along a sliding rod, and the coal mill main body 1 stops working; the fixed plate drives the temperature detection equipment and the air pressure detection equipment to move out of the coal mill main body; and then, an operator takes down the fixing bolts on the fixing plate, replaces the temperature detection equipment and the air pressure detection equipment with new one and installs the temperature detection equipment and the air pressure detection equipment on the fixing plate in the above manner. The device and the method are used for detonation prevention detection of the coal mill.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mill deflagration detection, and more specifically, it relates to a coal mill safety detection method based on temperature and air pressure. Background Technology

[0002] The coal mill is a key piece of equipment in a pulverized coal preparation system. Its function is to grind coal lumps into pulverized coal with a certain particle size and fineness to meet combustion requirements. The operating efficiency of the coal mill and the quality of the pulverized coal directly affect the boiler's combustion efficiency, thermal efficiency, and the overall economic efficiency and reliability of the unit. In modern industrial production, a high-efficiency and stable coal mill is of great significance for ensuring energy supply, improving production efficiency, reducing energy consumption, and minimizing environmental pollution. When grinding coal lumps, the internal conditions of the coal mill must be constantly monitored to prevent internal deflagration during operation.

[0003] Existing coal mills mainly rely on temperature and pressure detectors to monitor the internal conditions. However, these detectors operate in the enclosed environment of the mill for extended periods, leading to inaccurate readings over time. This prevents external operators from knowing the true internal conditions of the mill during operation, causing the detectors to fail to alarm properly when problems occur. Consequently, this increases the risk of deflagration detection devices. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a safety detection method for coal mills based on temperature and air pressure.

[0005] The above objectives are achieved through the following technical solutions: A safety detection method for coal mills based on temperature and air pressure, comprising the following steps: (1) When the temperature detection device and the air pressure detection device alarm or the main body of the coal mill has been working for a long time, the motor stops working, thereby stopping the main body of the coal mill 1. Then the operator unscrews the locking bolts and pulls the fixing plate out along the slide rod. The fixing plate drives the temperature detection device and the air pressure detection device to move out of the main body of the coal mill. Afterwards, the operator removed the fixing bolts on the fixing plate, replaced the temperature detection equipment and air pressure detection equipment with new ones and installed them on the fixing plate in the above manner. Then the operator pushed the fixing plate back to the side of the coal mill body to ensure that there was no gap between the coal mill body and the fixing plate. (3) The operator tightens the locking bolts on the main body of the coal mill to fix the position of the fixing plate and prevent the fixing plate from moving when the main body of the coal mill is working; (4) When there is too much coal powder and dust on the surface of the anti-clogging probe installed on the pressure tapping port, the pressure tapping port on the surface of the air pressure detection equipment is moved out of the main body of the coal mill by the above method. Then the operator rotates the anti-clogging probe so that the anti-clogging probe drives the locking block to rotate out of the locking slot of the pressure tapping port. Then the anti-clogging probe is pulled out. (5) After cleaning, reinstall the anti-clogging probe on the pressure tap in the above manner to avoid the pressure tap being blocked, which would cause the measurement results of the air pressure detection equipment to be distorted, thereby improving the working effect of the anti-deflagration detection device.

[0006] The aforementioned safety detection method for a coal mill based on temperature and air pressure involves the following: the outer wall of the main body of the coal mill is fixedly connected to four sliding rods; the outer walls of the four sliding rods are slidably connected to a fixed plate through through holes; the surface of the fixed plate is fixedly connected to a temperature detection device and an air pressure detection device through fixing bolts; the outer wall of the fixed plate is fixedly connected to a protrusion; the surface of the fixed plate has a wire insertion port; the protrusion is movably connected to a locking bolt through a through hole; and the locking bolt is connected to a circular groove thread on the surface of the main body of the coal mill.

[0007] The aforementioned safety testing method for a coal mill based on temperature and air pressure describes a method where one end of the main body of the coal mill is fixedly connected to a motor via a bracket, the other end of the main body of the coal mill is fixedly connected to a connecting pipe, and a discharge port is provided at the lower end of the main body of the coal mill.

[0008] The aforementioned safety detection method for a coal mill based on temperature and air pressure involves four sliding rods whose ends are threadedly connected to corresponding limiting blocks, wherein the diameter of the limiting blocks is larger than the diameter of the sliding rods.

[0009] The aforementioned safety detection method for a coal mill based on temperature and air pressure includes an air pressure detection device with a pressure tap on its outer wall, the end of which is fitted with an anti-clogging probe.

[0010] The aforementioned safety detection method for a coal mill based on temperature and air pressure includes an anti-clogging probe whose outer wall is fixedly connected to two locking blocks, which are inserted into slots on the surface of the pressure tapping port.

[0011] The aforementioned method for safety testing of a coal mill based on temperature and air pressure involves a connecting pipe whose upper end is fixedly connected to a storage tank, and the storage tank has a feed inlet machined on its side wall. Beneficial effects

[0012] 1. This invention relates to a coal mill body, a slide bar, a fixing plate, a temperature detection device, a pressure detection device, a protrusion, and locking bolts. After the temperature and pressure detection devices inside the coal mill have been working for a long time, the operator can loosen the locking bolts, pull the fixing plate outward along the slide bar, and then unscrew the fixing bolts of the temperature and pressure detection devices. The temperature and pressure detection devices can then be removed for maintenance. To reduce the downtime of the coal mill, new temperature and pressure detection devices can be installed on the fixing plate, and the wires can be connected to the outside of the fixing plate through the plug-in port. This method can avoid inaccurate readings from the temperature and pressure detectors after long-term operation, thereby reducing the danger of placing deflagration detection devices.

[0013] 2. This invention, through an anti-clogging probe, pressure tap, and locking block, prevents the pressure tap from being distorted due to excessive coal dust accumulation. The probe is then removed from the main body of the coal mill. The operator rotates the anti-clogging probe to pull the locking block out of the pressure tap. After cleaning, the anti-clogging probe is reinstalled on the pressure tap. This avoids the situation where coal dust clogs the pressure tap, leading to distorted measurement results and improves the effectiveness of the anti-deflagration detection device. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A left-view diagram; Figure 3 for Figure 1 A diagram showing the view from the right. Figure 4 for Figure 3 A three-dimensional schematic diagram of the anti-blockage probe, pressure tap, and locking block; In the diagram: 1. Main body of the coal mill; 2. Motor; 3. Connecting pipe; 4. Storage tank; 5. Feed inlet; 6. Slide rod; 7. Limiting block; 8. Fixing plate; 9. Socket; 10. Protrusion; 11. Locking bolt; 12. Temperature detection equipment; 13. Air pressure detection equipment; 14. Discharge port; 15. Anti-clogging probe; 16. Pressure tap; 17. Clamping block. Detailed Implementation

[0015] This invention provides a technical solution: a safety detection method for coal mills based on temperature and air pressure. The method includes the following steps: (1) When the temperature detection device and the air pressure detection device alarm or the main body of the coal mill has been working for a long time, the motor stops working, thereby stopping the main body of the coal mill 1. Then the operator unscrews the locking bolts and pulls the fixing plate out along the slide rod. The fixing plate drives the temperature detection device and the air pressure detection device to move out of the main body of the coal mill. (2) Afterwards, the operator removes the fixing bolts on the fixing plate, replaces the temperature detection device and the air pressure detection device with new ones and installs them on the fixing plate in the above manner. Then the operator pushes the fixing plate back to the side of the coal mill body so that there is no gap between the coal mill body and the fixing plate. (3) The operator tightens the locking bolts on the main body of the coal mill to fix the position of the fixing plate and prevent the fixing plate from moving when the main body of the coal mill is working; (4) When there is too much coal powder and dust on the surface of the anti-clogging probe installed on the pressure tap, the pressure tap on the surface of the air pressure detection equipment is moved out of the main body of the coal mill by the above method. Then the operator rotates the anti-clogging probe to make the anti-clogging probe drive the locking block to rotate out of the locking groove of the pressure tap, and then pulls off the anti-clogging probe. (5) After cleaning, reinstall the anti-clogging probe on the pressure tap in the above manner to avoid the pressure tap being blocked, which would cause the measurement results of the air pressure detection equipment to be distorted, thereby improving the working effect of the anti-deflagration detection device.

[0016] A safety detection method for a coal mill based on temperature and air pressure includes a coal mill body 1. The outer wall of the coal mill body 1 is fixedly connected to four sliding rods 6, fixing the position of the four sliding rods 6 and preventing the fixed plate 8 from being unable to move due to different angles of the four sliding rods 6. The outer walls of the four sliding rods 6 are slidably connected to the fixed plate 8 through through holes. The fixed plate 8 slides on the four sliding rods 6, making it easier to remove the fixed plate 8 from the coal mill body 1. The surface of the fixed plate 8 is fixedly connected to a temperature detection device 12 and an air pressure detection device 13 by fixing bolts. The models of the temperature detection device 12 and the air pressure detection device 13 are selected according to actual needs, and only those that meet the working requirements are selected. The fixed plate 8 drives the temperature detection device 12 and the air pressure detection device 13 to move. The temperature detection device 12 is based on the characteristic that the resistance value of a metal conductor or semiconductor changes with temperature. Resistance temperature detectors (RTDs) typically use materials such as platinum and copper, like the PT100 platinum RTD. Their resistance changes precisely with temperature variations, and the temperature is calculated by measuring this change in resistance. Similarly, the pressure detection device 13 utilizes the piezoresistive effect to convert pressure signals into electrical signals. When pressure acts on the sensor's sensitive element, the element's resistance changes, causing an imbalance in the bridge circuit and generating an electrical signal proportional to the pressure. The outer wall of the fixing plate 8 is fixedly connected to the protrusion 10. The fixing plate 8 drives the protrusion 10 to move. The surface of the fixing plate 8 has a wiring port 9, which allows the wires of the temperature detection device 12 and the air pressure detection device 13 to run to the outside of the fixing plate 8. The protrusion 10 passes through a through hole and is movably connected to the locking bolt 11. The locking bolt 11 passes through the protrusion 10 and is connected to the circular groove thread on the surface of the coal mill body 1. The locking bolt 11 fixes the position of the protrusion 10, thereby fixing the position of the fixing plate 8. Since the surface of the fixing plate 8 is provided with a sealing component, the fixing plate 8 can fit tightly against the surface of the coal mill body 1 without gaps. When the coal mill body 1... After the internal temperature detection device 12 and air pressure detection device 13 have been working for a long time, the operator can loosen the locking bolt 11, then pull the fixing plate 8 outward along the slide rod 6 to remove the temperature detection device 12 and air pressure detection device 13 for maintenance. After that, a new temperature detection device 12 and air pressure detection device 13 can be installed on the fixing plate 8, and the wires required for the temperature detection device 12 and air pressure detection device 13 can be connected to the outside of the fixing plate 8 through the plug-in port 9. In this way, the inaccurate value detection of the temperature detection device 12 and air pressure detection device 13 after long-term operation can be avoided, thereby reducing the danger of placing the deflagration detection device.

[0017] One end of the coal mill body 1 is fixedly connected to the motor 2 via a bracket. The model of the motor 2 is selected according to actual needs, and only needs to meet the working requirements. The motor 2 can drive the coal mill body 1 to work. The other end of the coal mill body 1 is fixedly connected to the connecting pipe 3. The connecting pipe 3 allows the coal blocks in the storage tank 4 to enter the coal mill body 1. The lower end of the coal mill body 1 is provided with a discharge port 14, so that the coal powder in the coal mill body 1 can be discharged from the coal mill body 1.

[0018] The ends of the four sliding rods 6 are threadedly connected to the corresponding limiting blocks 7. The limiting blocks 7 are tightened on the sliding rods 6 so that the limiting blocks 7 can be removed, thereby removing the fixing plate 8 from the sliding rods 6. The diameter of the limiting blocks 7 is larger than the diameter of the sliding rods 6.

[0019] The outer wall of the air pressure detection device 13 is provided with a pressure tap 16. The pressure tap 16 can sample the air pressure inside the coal mill body 1 and measure the air pressure inside the coal mill body 1 through the air pressure detection device 13. The end of the pressure tap 16 is in contact with the anti-clogging probe 15. The anti-clogging probe 15 can prevent coal dust from blocking the pressure tap 16.

[0020] The outer wall of the anti-clogging probe 15 is fixedly connected to two locking blocks 17. The two locking blocks 17 are inserted into the slots on the surface of the pressure tapping port 16. The locking blocks 17 can keep the anti-clogging probe 15 fixed outside the pressure tapping port 16 and prevent it from falling off.

[0021] The upper end of the connecting pipe 3 is fixedly connected to the storage tank 4, and the side wall of the storage tank 4 is machined with a feed inlet 5.

[0022] The specific usage and function of this embodiment are as follows: In use, coal blocks are first placed in the storage tank 4 through the feed inlet 5 and then enter the coal mill body 1 through the connecting pipe 3. The external power supply to the motor 2 is then connected, and the motor 2 is started. The motor 2 causes the coal mill body 1 to begin working, grinding the coal blocks into coal powder, which is then discharged from the discharge outlet 14. The operator collects the discharged coal powder. When the temperature detection device 12 and the air pressure detection device 13 trigger an alarm, or when the coal mill body 1 has been operating for an extended period, the motor 2 stops working, thus stopping the coal mill body 1. The operator then loosens the locking bolts 11 and pulls the fixing plate 8 outward along the slide rod 6. The fixing plate 8 removes the temperature detection device 12 and the air pressure detection device 13 from the coal mill body 1. The operator then removes the fixing bolts on the fixing plate 8, replaces the temperature detection device 12 and the air pressure detection device 13 with new ones, and installs them on the fixing plate 8 in the same manner as described above. Afterwards, the operator pushes the fixing plate 8 back to the side of the coal mill body 1, ensuring there is no gap between the coal mill body 1 and the fixing plate 8. The operator then tightens the locking bolt 11 onto the coal mill body 1 to fix the position of the fixing plate 8, preventing it from moving during operation. When there is excessive coal powder and dust on the surface of the anti-clogging probe 15 installed on the pressure tap 16, the operator moves the pressure tap 16 on the surface of the air pressure detection device 13 out of the coal mill body 1 using the above method. Then, the operator rotates the anti-clogging probe 15, causing the anti-clogging probe 15 to drive the locking block 17 out of the slot of the pressure tap 16. Afterwards, the operator removes the anti-clogging probe 15, cleans it, and then reinstalls the anti-clogging probe 15 on the pressure tap 16 using the above method. This prevents the pressure tap 16 from being blocked, which would cause the measurement results of the air pressure detection device 13 to be distorted, thereby improving the working effect of the anti-deflagration detection device.

Claims

1. A safety detection method for coal mills based on temperature and air pressure, characterized in that: The method includes the following steps: (1) When the temperature detection device and the air pressure detection device alarm or the main body of the coal mill has been working for a long time, the motor stops working, thereby stopping the main body of the coal mill 1. Then the operator unscrews the locking bolts and pulls the fixing plate out along the slide rod. The fixing plate drives the temperature detection device and the air pressure detection device to move out of the main body of the coal mill. (2) Afterwards, the operator removes the fixing bolts on the fixing plate, replaces the temperature detection device and the air pressure detection device with new ones and installs them on the fixing plate in the above manner. Then the operator pushes the fixing plate back to the side of the coal mill body so that there is no gap between the coal mill body and the fixing plate. (3) The operator tightens the locking bolts on the main body of the coal mill to fix the position of the fixing plate and prevent the fixing plate from moving when the main body of the coal mill is working; (4) When there is too much coal powder and dust on the surface of the anti-clogging probe installed on the pressure tapping port, the pressure tapping port on the surface of the air pressure detection equipment is moved out of the main body of the coal mill by the above method. Then the operator rotates the anti-clogging probe so that the anti-clogging probe drives the locking block to rotate out of the locking slot of the pressure tapping port. Then the anti-clogging probe is pulled out. (5) After cleaning, reinstall the anti-clogging probe on the pressure tap in the above manner to avoid the pressure tap being blocked, which would cause the measurement results of the air pressure detection equipment to be distorted, thereby improving the working effect of the anti-deflagration detection device.

2. The method for safety detection of a coal mill based on temperature and air pressure according to claim 1, characterized in that: The outer wall of the main body of the coal mill is fixedly connected to four sliding rods. The outer walls of the four sliding rods are slidably connected to a fixed plate through through holes. The surface of the fixed plate is fixedly connected to a temperature detection device and a pressure detection device through fixing bolts. The outer wall of the fixed plate is fixedly connected to a protrusion. A wire insertion port is provided on the surface of the fixed plate. The protrusion is movably connected to a locking bolt through a through hole. The locking bolt is connected to a circular groove thread on the surface of the main body of the coal mill.

3. The method for safety detection of a coal mill based on temperature and air pressure according to claim 2, characterized in that: One end of the main body of the coal mill is fixedly connected to the motor via a bracket, and the other end of the main body of the coal mill is fixedly connected to a connecting pipe. A discharge port is provided at the lower end of the main body of the coal mill.

4. The method for safety detection of a coal mill based on temperature and air pressure according to claim 3, characterized in that: The ends of the four slide rods are threadedly connected to corresponding limiting blocks, and the diameter of the limiting blocks is larger than the diameter of the slide rods.

5. The method for safety detection of a coal mill based on temperature and air pressure according to claim 4, characterized in that: The outer wall of the air pressure detection device is provided with a pressure tap, and the end of the pressure tap is attached to the anti-clogging probe.

6. The method for safety detection of a coal mill based on temperature and air pressure according to claim 5, characterized in that: The outer wall of the anti-clogging probe is fixedly connected to two locking blocks, which are inserted into the slots on the surface of the pressure tapping port.

7. The method for safety detection of a coal mill based on temperature and air pressure according to claim 6, characterized in that: The upper end of the connecting pipe is fixedly connected to the storage tank, and the side wall of the storage tank is machined with a feed inlet.

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