Dynamic monitoring method for abrasion of exhaust valve of marine low-speed machine

Abstract

The invention relates to the technical field of marine low-speed machine exhaust valves, and discloses a marine low-speed machine exhaust valve abrasion dynamic monitoring method which comprises the following steps that 1, a sensor is arranged on one side of the tail end of an exhaust valve rod; 2, the CCU controls the sensor to collect a position signal when the exhaust valve is closed, the position signal serves as a calibration value A, and the calibration value A is transmitted to the MCU; 3, the sensor collects a position signal B when the exhaust valve is closed every time and transmits data to the MCU, and the MCU analyzes and calculates the abrasion loss and transmits the abrasion loss to the MCP control display unit; 4, the MCU transmits the abrasion loss generated when the exhaust valve is closed every time to the MCP control display unit, and the MCP control display unit records and displays abrasion loss data in real time and gives an alarm when the abrasion loss data exceed a certain abrasion threshold value. Abrasion of the exhaust valve is detected in real time, data are accurate and reliable, the valve can be conveniently and regularly replaced at the proper time, and therefore the adverse effect on ship operation is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of exhaust valves for marine low-speed engines, and in particular to a method for dynamically monitoring wear of exhaust valves for marine low-speed engines. Background Art

[0002] The low-speed engine exhaust valve is a high-temperature and high-pressure valve for exhausting high-temperature gases. During use, the sealing surface will be worn, corroded and eroded due to the erosion of impurities contained in the high-temperature gas and flue gas. When the degree of wear, corrosion and erosion reaches a certain value, the sealing effect becomes worse, and the valve cannot cut off the medium after closing.

[0003] During the valve closing process, high pressure and inertia impact the valve face, and the sealing surface will be worn. These problems that occur during the online use of the valve cannot be discovered by observing the appearance of the valve. Generally, the problem can only be determined after the operator discovers serious loss of the medium. The accuracy of the judgment result is not high, and the problem cannot be discovered in time. Moreover, the valve sealing surface cannot be used after excessive wear and tear, and the valve needs to be replaced and repaired. The process of replacing and inspecting the valve takes a long time, which affects the ship's operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the exhaust valve of a low-speed engine is prone to wear under high temperature and high pressure, and the wear cannot be detected by observing the appearance of the valve, thereby affecting normal operation.

[0005] In order to solve the above technical problems, the technical solution of the present invention is to provide a method for dynamic monitoring of exhaust valve wear of a marine low-speed engine, including a sensor, a CCU control unit, an MCU control unit and an MCP control display unit, including the following steps:

[0006] Step 1: Set up a sensor on one side of the exhaust valve stem end, and connect the sensor to the CCU control unit, and connect the CCU control unit, MCU control unit and MCP control display unit accordingly;

[0007] Step 2: The CCU control unit controls the sensor to collect the position signal when the exhaust valve is closed as the calibration value A, and transmits it to the MCU control unit;

[0008] Step 3: The exhaust valve is opened and closed normally. The sensor collects the position signal B of the exhaust valve each time it is closed, and transmits the data to the MCU control unit. The MCU control unit analyzes and calculates the wear amount based on the calibration value A and the actual position signal B, and transmits it to the MCP control display unit;

[0009] Step 4: The MCU control unit transmits the wear amount each time the exhaust valve is closed to the MCP control and display unit. The MCP control and display unit records and displays the wear amount data in real time, and issues an alarm when a certain wear threshold is exceeded.

[0010] Optionally, the CCU control unit is connected to the MCU control unit via CAN communication, and the MCU control unit is connected to the MCP control and display unit via MODBUS / TCP protocol.

[0011] Optionally, the sensor is a remote high frequency induction sensor.

[0012] In summary, the present invention designs a method for dynamically monitoring the wear of exhaust valves of marine low-speed engines, which can detect the wear of exhaust valves in real time. The data is accurate and reliable, which facilitates the planned replacement of valves at the appropriate time, thereby reducing the adverse effects on ship operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the principle of the sensor measuring position information of the present invention. DETAILED DESCRIPTION

[0014] The following combination Figure 1 The present invention is described in further detail.

[0015] Generally, the position of the valve is measured by an inductive pick-up sensor located within the valve housing assembly. However, the extended valve shaft has a rigid tapered structure. As the valve stroke increases, the distance from the fixed sensor also changes. The actual position of the valve is not easy to determine in advance. In addition, aging / wear or machining during overhaul will change the vertical position of the cone, thereby moving the measurement range, resulting in lower measurement accuracy.

[0016] Therefore, refer to Figure 1 , the present invention discloses a method for dynamic monitoring of exhaust valve wear of a marine low-speed engine, so that each complete stroke of the valve is recorded and processed to record the extreme value of the sensor output, thereby ensuring the measurement accuracy, so that the exact threshold value (in [uA]) of the valve changing state (open / closed) can be determined, so as to quickly evaluate the valve state in the next measurement;

[0017] Specifically, the present invention includes modules such as a sensor, a CCU control unit, an MCU control unit, and an MCP control display unit, and includes the following steps:

[0018] Step 1: Set up a sensor at one end of the exhaust valve stem, and connect the sensor to the CCU control unit, and then connect the MCU control unit and the MCP control display unit accordingly;

[0019] Step 2: The CCU control unit controls the sensor to collect the position signal when the exhaust valve is closed as the calibration value A, and transmits it to the MCU control unit through CAN communication;

[0020] Step 3: The exhaust valve is opened and closed normally. The valve surface is worn after long-term use. When the valve is closed, the changed position will be inconsistent with the basic position. The sensor collects the position signal B of the exhaust valve each time it is closed. The CCU control unit records 10,000 cycle signal values ​​and takes the real effective value and writes it to the MCU control unit through CAN communication transmission. The MCU control unit analyzes and calculates the wear amount based on the calibration value A and the actual position signal B, and transmits it to the MCP control display unit through the MODBUS / TCP protocol;

[0021] Step 4: The MCU control unit transmits the amount of wear each time the exhaust valve is closed to the MCP control and display unit. The MCP control and display unit records and displays the wear data in real time, and issues an alarm when a certain wear threshold is exceeded. At the same time, engineers can also make an exhaust valve life assessment by comparing the relative time signal value B.

[0022] Specifically, the sensor is a remote high-frequency induction sensor, which uses an inductive measurement method to measure the distance through the current signal. Because the exhaust valve operates at high temperature, high pressure and high frequency, the sensor collects data through remote indirect induction and high frequency, processes and compares the calibration data, and the system feeds back the data and prompts an excessive wear alarm. The data is accurate and reliable.

[0023] The present invention collects data through remote indirect induction high frequency of the sensor, processes and compares the calibration data, and the system feeds back the data and prompts an excessive wear alarm, thereby solving the problem that the wear of the engine exhaust valve cannot be monitored. Compared with the current exhaust valve that needs to be disassembled for inspection, this method can extend the disassembly and inspection cycle, and can quantify the wear condition with data, and the data is accurate and reliable.

[0024] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for dynamically monitoring the wear of a marine low-speed engine exhaust valve, comprising a sensor, a CCU control unit, an MCU control unit and an MCP control display unit, characterized in that: The following steps are involved: Step 1: Set up a sensor on one side of the exhaust valve stem end, and connect the sensor to the CCU control unit, and connect the CCU control unit, MCU control unit and MCP control display unit accordingly; Step 2: The CCU control unit controls the sensor to collect the position signal when the exhaust valve is closed as the calibration value A, and transmits it to the MCU control unit; Step 3: The exhaust valve is opened and closed normally. The sensor collects the position signal B of the exhaust valve each time it is closed, and transmits the data to the MCU control unit. The MCU control unit analyzes and calculates the wear amount based on the calibration value A and the actual position signal B, and transmits it to the MCP control display unit; Step 4: The MCU control unit transmits the wear amount each time the exhaust valve is closed to the MCP control and display unit. The MCP control and display unit records and displays the wear amount data in real time, and issues an alarm when a certain wear threshold is exceeded.

2. The method for dynamic monitoring of exhaust valve wear of a marine low-speed engine according to claim 1, characterized in that: The CCU control unit is connected to the MCU control unit via CAN communication, and the MCU control unit is connected to the MCP control and display unit via MODBUS / TCP protocol.

3. The method for dynamic monitoring of exhaust valve wear of a marine low-speed engine according to claim 1, characterized in that: The sensor is a remote high frequency inductive sensor.

Images