How to solve common faults of tunnel boring machine hydraulic system?

Various faults often occur in the hydraulic system of tunnel boring machines during work, affecting construction progress and safety. In order to help solve this problem, PHP editor Xinyi brings you solutions to common faults in the hydraulic system of tunnel boring machines. The following content will introduce in detail the specific manifestations, cause analysis and solutions of several common faults to help everyone effectively troubleshoot and ensure the normal operation of the tunnel boring machine hydraulic system.

1. How to solve common faults of tunnel boring machine hydraulic system?

Common faults in the hydraulic system of tunnel boring machines mainly include insufficient system flow or pressure, high oil temperature, insufficient oil level, oil contamination, etc. The specific fault causes are analyzed as follows:

1) Insufficient system flow and pressure Cause of the fault: Internal oil pump Parts are severely worn, the efficiency of the oil pump is reduced or internally damaged; the relief valve is not working properly; the oil level is too low, the oil temperature is too high; the oil suction filter or oil pipe is clogged; the oil pipe is broken or the joint is leaking.

Solution: Check the performance of the pump, replace damaged parts, adjust the relief valve; refill the fuel tank; check the cause of excessive oil temperature; replace the filter; clean the fuel tank; check the oil pipes and joints.

Impact: The speed of the actuator of the hydraulic system is too low, the output force or torque is too small, the system heats up seriously, the noise increases, and in serious cases, the oil pump is damaged.

Current status of diagnostic methods: The main monitoring parameters for this fault are the flow and pressure of each loop of the system. At present, manual inspection is mainly used. When the equipment fails, workers check the pressure and flow of each circuit of the hydraulic system one by one. The pressure is observed through the pressure gauge that comes with the tunnel boring machine. The flow rate cannot be detected. One method is to use a portable flow meter to measure. This method is more accurate, but the cost of purchasing explosion-proof measuring equipment for coal mines is high. Another method commonly used at present is to indirectly judge through the movement speed of the actuator. The accuracy is Bad, takes a long time.

2) Reasons for system temperature rise too high: insufficient cooling water supply; insufficient oil in the tank; serious oil contamination; lax relief valve closure; contamination of the oil return filter; oil pump failure.

Solution: Check the cooler, refill the fuel tank or change the oil; clean the relevant relief valve and filter; check the inside of the oil pump and replace the relevant parts.

Impact: Cause damage to the seals of the hydraulic system, increase leakage, and in severe cases, damage to components such as oil pumps, valves, motors, and cylinders.

Current status of diagnostic methods: The main monitoring parameter for this fault is the oil temperature at the oil return position of the hydraulic system oil tank. At present, manual regular observation is mainly carried out through the liquid temperature gauge on the oil tank. When a fault occurs, workers must investigate and deal with the possible causes of high temperature in the hydraulic system one by one. Automatic alarm and diagnosis cannot be carried out.

3) Insufficient oil level in the fuel tank Cause of failure: Insufficient fuel in the fuel tank; leakage in the hydraulic system.

Solution: Replenish the fuel tank in time; find the leak point and deal with it in time.

Impact: The hydraulic pump will not absorb enough oil and the system will become seriously heated, thereby damaging the hydraulic components.

Current status of diagnostic methods: The main monitoring parameter for this fault is the oil level of the hydraulic system tank. At present, manual regular observation is mainly carried out through the liquid level gauge on the fuel tank. After a fault occurs, workers investigate and deal with the possible reasons for the low oil level one by one. Currently, there is no automatic alarm or diagnosis.

4) Causes of oil pollution failure: oil pollution caused by replenishing oil in the fuel tank; oil pollution caused by system pipeline maintenance and repair; there are many impurities in the fuel tank; the pollution degree of the filter element exceeds the standard.

Solution: Replace the hydraulic oil; clean the fuel tank; replace the filter element

Impact: causing oil pumps, valves, motors and cylinders to become jammed, causing damage to hydraulic components.

Current status of diagnostic methods: The main monitoring parameter for this fault is the contamination degree of the hydraulic oil. At present, it is mainly based on empirical judgment, and then sampling the oil in the tank and going to the well to find a testing agency for testing, which is time-consuming and expensive.

Based on the above analysis, it can be seen that the current detection of common faults in the hydraulic system of tunnel boring machines is relatively passive. Most of them are manually checked based on experience after the fault occurs, which takes a long time, poor accuracy, high cost, and cannot be detected before the fault occurs. It is impossible to provide early warning in advance, and it is impossible to accurately determine the fault point when a fault occurs.

2. How to solve common faults of microcomputer time control switch?

　Microcomputer time control switch common troubleshooting 1. The power indicator light does not light up and the switch does not move. Remove the time control switch from the mains and check whether there is a resistance of about 2.4k at the mains input terminal. This is the primary winding of the 12V transformer. The resistance value varies greatly depending on the wire diameter and number of turns used in the transformer. If the input terminal is open circuit, check whether the 0.5A fuse is blown out. If the transformer is damaged, replace it with a 12V transformer of similar size. The actual measured rectified output voltage of the transformer is about 15V when the relay is released, and drops to about 12V after the relay is closed. 2. After being used or left for a long time, the characters displayed on the LCD screen are dim or not displayed when the mains power is not connected. This is caused by insufficient power or failure of the included battery. Two AA high-performance batteries need to be replaced. Be careful not to replace it with a rechargeable battery because the voltage of the rechargeable battery is too low. 3. When the set time is reached, the time control switch does not turn on automatically. If the set time and status are confirmed to meet the requirements, the setting sequence when setting the automatic status is incorrect. The conversion sequence of the KG316T computer time control switch when pressing the automatic/manual key to set open, automatic, and off is a reciprocating conversion method, not a cyclic method. When setting to automatic mode, you should first switch the triangular arrow indicating the state from the position corresponding to the current state to the automatic position. 4. The time control switch keeps turning on and off. This fault is mostly caused by short circuit damage to Q1 and Q2. After detection, it can be replaced with a common 2s8050 transistor. Q1 can also be replaced with an ordinary low-power NPN transistor such as 9013. When replacing a damaged relay, the load size should be considered, and it is best to replace it with the same model.

3. Common computer faults and solutions

Classification of computer faults

With the widespread use of computers in our lives and work, encountering computer faults has become the norm. Computer failures can be divided into two types: hardware failures and software failures.

Hardware failure

Black screen: nothing is displayed on the screen after the computer starts.

Check if the power connection is loose. Try unplugging and reinserting the graphics card. Check whether the memory is plugged in tightly.

Blue screen: The computer displays a blue screen prompt and automatically restarts.

Check whether the memory is damaged and try to replace the memory module. Check the hard drive for errors and run a disk detection tool to fix them. Check to see if new hardware or software has been installed recently, and if so, try uninstalling or disabling them.

Software Failure

System Crash: The computer operating system cannot run properly.

Try to start the computer in safe mode and perform system repairs. Reinstall the operating system. Make sure your computer has the latest system updates installed.

Slowdown: The computer's running speed drops significantly.

Clean unnecessary files and programs from your computer. Run anti-virus software to check the system. Add memory modules to improve computer performance.

Summary

Computer faults are common problems we encounter when using computers, but with some simple methods we can solve most common faults by ourselves. I hope that the methods I provide can help readers solve computer problems and improve work and life efficiency.

Thank you for reading this article. I believe that the methods provided in this article can help you better deal with computer failure problems.

4. Lenovo computer repair: How to quickly solve common Lenovo computer faults

Lenovo computer repair: How to quickly solve common Lenovo computer faults

As a well-known computer brand, Lenovo computers are highly consumed for their stability and performance. favored by those. However, during use, Lenovo computers will also encounter various malfunctions. This article will introduce you to some common Lenovo computer failures and provide corresponding repair solutions to help you quickly solve the problem and restore normal use.

FAQ 1: Lenovo computer has a black screen when it starts up

When you try to start up your Lenovo computer, you find that the screen is black. This may be caused by a problem with the monitor connection or a system failure. First, you can try reconnecting the monitor's data cable to make sure the connection is secure. If the problem persists, you can try to enter safe mode to repair the system. If safe mode cannot solve the problem, you may need to consider system reinstallation.

FAQ 2: Lenovo computer suddenly crashes

During use, Lenovo computer suddenly crashes is a relatively common problem. This could be due to a hardware protection mechanism being triggered due to overheating, or it could be a software conflict causing the system to crash. For this problem, you can try cleaning the radiator, replacing thermal grease, and optimizing system startup items to solve the overheating problem. You can also solve the software conflict problem by uninstalling conflicting software and updating drivers.

FAQ 3: Lenovo computer blue screen or system crash

Blue screen or system crash is one of the problems that users often encounter when using Lenovo computers. This may be due to hardware failure, driver issues, or corrupted system files. To deal with this problem, you can try to solve it by checking the hardware connection, updating or rolling back the driver, repairing the system file, etc. If the problem persists, you may want to consider contacting professional maintenance personnel or official Lenovo customer service for help.

Summary

When using Lenovo computers, the faults described above are only some of the problems that may be encountered, and the solutions are only a common way. If you encounter a problem that cannot be solved, it is recommended that you contact Lenovo customer service or seek professional repair services in time to avoid more serious damage caused by improper personal repairs. I hope this article can help you better understand Lenovo computer repair related knowledge and ensure that your Lenovo computer can run efficiently and stably.

Thank you for reading this article. I hope this article can provide you with some help when solving Lenovo computer problems.

5. Common computer failures and solutions in Internet cafes?

The OC mechanism of the USB port is triggered. It is most likely that your USB device is short-circuited or the USB port part is faulty. Unplug all USB keyboards, USB mice and USB hubs, and then turn on the computer. 1. If it can be turned on normally, it means There is a problem with one of the USB devices you unplugged. Connect them one by one to see which device is the problem. Just replace it. 2. If it still cannot boot normally, it means that the USB port is short-circuited. Check each USB port one by one. Is there any foreign object inside or a short circuit inside? 3. If the problem is still not found in step 2, disassemble the case and unplug the front USB. If it can boot normally, there is something wrong with the front panel. Just replace the front panel. 4. If step 3 still cannot solve the problem, it means that there is a short circuit somewhere inside the board near the USB. It is most likely that the first possibility is to find a professional to repair it!

6. Tablet PC Repair Guide: Easily Solve Common Faults

In this digital age, tablet computers have become an indispensable electronic device in our daily lives. Whether it is browsing the Internet, watching videos or studying in the office, tablet computers have brought us great convenience. However, just like any other electronic product, tablets are bound to have various glitches and problems. When your tablet breaks down, don't worry, this article will provide you with some useful repair tips to help you easily solve common tablet failures.

1. Battery failure

Battery failure is one of the most common problems with tablets. If you find that the tablet battery cannot be charged normally or the power is consumed too quickly, you can try the following methods:

Check whether the charging cable and adapter are working properly, and replace with new charging equipment if necessary. Close unnecessary applications and background processes to reduce battery consumption. Adjust screen brightness and other settings to save battery power. If the problem persists, the battery may need to be replaced with a new one.

2. Screen failure

Screen failure is also one of the common problems of tablet computers. If you find that the screen has scratches, dead pixels, or cannot display properly, you can try the following methods:

Use a professional screen protector or case to prevent the screen from being scratched or bumped. Adjust the screen brightness and contrast settings to see if that improves the display. If the problem persists, you may need to replace the screen with a new one.

3. System failure

System failure is also one of the common problems of tablet computers. If you find that your tablet is running slowly, apps often crash, or cannot start properly, you can try the following methods:

Restart your tablet to see if that solves the problem. Clean up system junk and cache files to free up more memory space. Uninstall unnecessary applications to reduce system load. If the problem persists, you may need to restore factory settings or update the system.

Overall, tablet repair is not as difficult as it seems. As long as you master some basic maintenance skills, most common faults can be easily solved. If you encounter a problem that you cannot solve yourself, you can also seek help from professional maintenance personnel. I hope this article is helpful to you, and I wish you a happy use of your tablet!

7. How to solve common gateway failures?

First of all, if conditions permit, you can use another PC to connect and try. If the connection is stable, it is basically a computer problem. You can update the driver, replace the network card or reinstall it; if the same situation occurs on another computer, it should be the network cable. , Gateway failure can be solved by replacing the network cable, redoing the crystal head, replacing the gateway interface, replacing the gateway and other measures

8. Common faults and solutions in computer switching power supply maintenance?

Common faults and solutions for computer switch power supply maintenance

1, fuse blown

Generally, a blown fuse indicates there is a problem with the internal wiring of the power supply. Since the power supply operates at high voltage and high current, fluctuations and surges in the grid voltage will cause the current in the power supply to increase instantaneously and cause the fuse to blow. The focus should be to check the rectifier diodes, high-voltage filter electrolytic capacitors, inverter power switch tubes, etc. at the power input end to check whether these components have breakdown, open circuit, damage, etc. If the fuse is indeed blown, you should first check the various components on the circuit board to see if the appearance of these components is burnt and whether the electrolyte has overflowed. If the above conditions are not found, use a multimeter to measure whether the switch tube has a breakdown or short circuit. . Special attention should be paid to: When a component is found to be damaged, you must not turn it on directly after replacing it. This is very likely to damage the replaced component because other high-voltage components are still faulty. Be sure to conduct a comprehensive inspection of all high-voltage components in the above circuit. Only after checking and measuring can the fault of the blown fuse be completely eliminated. ,

2, No DC voltage output or unstable voltage output

If the fuse is intact, there will be no DC voltage output at all levels under load. This situation is mainly caused by the following reasons: open circuit or short circuit in the power supply, failure of the overvoltage and overcurrent protection circuit, auxiliary power supply failure, oscillation circuit not working, overload of the power supply, rectifier diode in the high-frequency rectifier filter circuit Breakdown, filter capacitor leakage, etc. After measuring the secondary components with a multimeter and ruling out the breakdown of the high-frequency rectifier diode and the load short circuit, if the output is zero at this time, it is certain that the control circuit of the power supply is faulty. If there is some voltage output, it means that the front-end circuit is working normally, and the fault lies in the high-frequency rectifier and filter circuit. The high-frequency filter circuit mainly consists of a rectifier diode and a low-voltage filter capacitor to form a DC voltage output. The breakdown of the rectifier diode will cause the circuit to have no voltage output, and the leakage of the filter capacitor will cause unstable output voltage and other faults. Damaged components can be detected by statically measuring the corresponding components with a multimeter.

3. Poor power supply load capacity

Poor power supply load capacity is a common fault. It usually occurs in old-fashioned or long-working power supplies. The main reason is that the components are aging and the switching tube is unstable. There is no Dissipate heat in time, etc. You should focus on checking whether the Zener diode is hot and leaking, the rectifier diode is damaged, the high-voltage filter capacitor is damaged, etc.

9. The computer cannot be turned on? Quickly diagnose and solve common faults

The computer cannot be turned on is a very common problem, which may be caused by hardware failure, software problems or other reasons. As a professional website editor, I will introduce you in detail to the common reasons why the computer cannot be turned on and the corresponding solutions to help you restore normal use of the computer as soon as possible.

Common reasons why the computer cannot be turned on

1. Power supply failure The power supply is the most basic hardware component of the computer. If there is a problem with the power supply, the computer will naturally not be able to start normally. Common power failures include damaged power cords, failed power adapters, damaged power supply units themselves, etc.

2. Motherboard failure The motherboard is the "brain" of the computer and is responsible for coordinating the work of various hardware components. If there is a problem with the motherboard, the computer will not be able to boot. Motherboard failure may be caused by aging, static damage, or other reasons.

3. Memory failure Memory is a necessary condition for the computer to run programs. If the memory fails, the computer will not start normally. Memory failure may be caused by a problem with the memory module itself or a memory slot failure.

4. Hard drive failure The hard drive is the main storage device of the computer. If there is a problem with the hard drive, the computer will not be able to boot. Hard drive failure may be caused by mechanical failure, file system corruption, or other reasons.

5. Software problems Sometimes the computer cannot be turned on, which may also be caused by software problems, such as system file corruption, virus infection, or incorrect system settings.

How to diagnose and solve the problem that the computer cannot be turned on

Faced with the problem that the computer cannot be turned on, we can diagnose and solve the problem by following the following steps:

Check the power supply First check whether the power cord is firmly connected and whether the power adapter is working properly. If there is a problem with the power supply, just replace the power cord or adapter. Check the motherboard. If there is no problem with the power supply, you can try to check whether the motherboard is faulty. You can observe the indicator light on the motherboard. If the indicator light on the motherboard does not light up, there may be a problem with the motherboard. Check the memory. If there is no problem with the motherboard, you can check whether the memory is installed correctly, or try to replace the memory module. Check the hard disk. If there are no problems with the above steps, you can check whether the hard disk is faulty. You can try to replace the hard drive with another computer, or use a hard drive detection tool to check the status of the hard drive. Check for software problems. If there are no problems with the hardware, you can consider whether there are software problems. You can try to use system repair tools to repair system files, or enter safe mode to troubleshoot the problem.

Through the diagnosis and troubleshooting of the above steps, I believe you will be able to find the root cause of the computer being unable to boot and take appropriate measures to repair it. If the problem still cannot be solved, it is recommended that you seek help from professional maintenance personnel.

Thank you for reading this article. I hope that through this content, you can quickly diagnose and solve the problem of the computer not being able to turn on, and restore the normal use of the computer. If you have any other questions during use, please feel free to contact me at any time, and I will do my best to provide you with professional help and advice.

10. Common faults and solutions of computer water cooling systems

For players who love e-sports and pursue excellent performance, water cooling systems are undoubtedly the best choice. Compared with traditional air-cooling systems, water-cooling systems can more effectively reduce the temperature of the CPU and graphics card, thereby achieving more stable operation. However, there are also some common faults in the water cooling system, such as water cooling air leakage, leakage, pipeline blockage and other problems. If not found and solved in time, it is likely to cause serious hardware damage. Therefore, it is very important to understand the common faults of water cooling systems and their solutions.

Causes and solutions to water cooling draft leakage

Water cooling draft leakage refers to problems with the water circulation in the water cooling system, resulting in a decrease in heat dissipation effect. Common causes of this problem include:

Water pump failure: The water pump is the heart of the water cooling system. If there is a problem with the water pump, it will lead to poor water circulation, resulting in draft. The solution is to replace the water pump. Pipeline blockage: The pipelines of the water cooling system may accumulate dirt and impurities due to long-term use, causing pipeline blockage and affecting water circulation. The solution is to clean the lines. Clogging of the radiator: The heat dissipation effect may be reduced due to long-term accumulation of dust inside the radiator. The solution is to clean the radiator. Liquid leakage: If there is a liquid leakage in the water cooling system, it will not only cause the water circulation to be blocked, but also cause damage to the computer hardware. The solution is to repair leaks promptly.

Daily maintenance of the water cooling system

In order to avoid failure of the water cooling system, we need to perform regular maintenance on it, which mainly includes the following aspects:

Check the pipelines: Regularly check the pipelines of the water cooling system to see if there is any damage or damage. Where leaks occur, repair them promptly. Clean the radiator: every 3-6 months, use a soft brush or vacuum cleaner to clean the dust on the surface of the radiator to maintain good heat dissipation. Replace the coolant: Depending on usage, replace the coolant every 6-12 months to ensure the cleanliness and thermal conductivity of the liquid. Check the water pump: Check the operation of the water pump regularly. If any abnormality is found, replace the water pump in time.

Preventive measures for water cooling system failure

In addition to regular maintenance, we also need to take some preventive measures to reduce the risk of water cooling system failure:

Choose high-quality water cooling accessories: Choose well-known brand water cooling accessories, such as water pumps and radiators etc., which can effectively reduce the probability of failure. Reasonable wiring: Reasonably arrange the water-cooling pipelines to avoid being too narrow or too bent, so as not to affect the water circulation. Keep the environment clean: Keep the inside of the computer case clean and remove dust regularly to avoid clogging of the radiator. Add water appropriately: If you find that the water level of the water cooling system has dropped, add pure water in time to ensure the normal operation of the system.

In short, mastering the common failures of water cooling systems and their solutions, and taking appropriate preventive measures, can effectively avoid water cooling system failures, protect computer hardware, and bring players a smoother gaming experience. Hope this article is helpful to you.

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