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Diesel Generator Crankshaft Journal Clearance Detection Method

Feb 28, 2024 | Technical Literature | 0 comments

In the maintenance process of diesel generators, the detection of crankshaft journal clearance is one of the very important links. Choosing the appropriate detection method can ensure the normal operation and safe use of diesel generators. This article introduces two commonly used crankshaft journal interexcitation detection methods, the ink test method and the measuring tool measurement method, and makes a comparison and analysis. According to actual needs and specific conditions, choosing an appropriate detection method is very important to ensure the quality and reliability of mechanical manufacturing. It is recommended to combine improvement directions in practical applications to further improve the detection efficiency and accuracy of crankshaft journal clearance.

Crankshaft journal clearance detection method

1.Printing ink test method

The oil seal test method is to detect the crankshaft journal clearance by applying lubricating oil on the crankshaft bearing, then gently inserting the crankshaft journal into the bearing, and then gently lifting the crankshaft upward with your fingers to observe the lubrication status of the bearing. Specific steps are as follows:

(1) Preparation work: Clean the surfaces of the crankshaft journal and crankshaft block, and check whether the surfaces of the crankshaft journal and crankshaft block are smooth.
(2) Apply lubricating oil to your fingers on the crankshaft journal to spread it evenly on the crankshaft journal surface.
(3) Push the crankshaft block into the crankshaft journal to make the gap as uniform as possible, but it should not be too tight.
(4) Use the ink card to slide on the surface of the crankshaft journal at a certain angle so that the oil forms a bright mark on the journal.
(5) Use a stamp film thickness meter to measure the thickness of the imprint and record it.
(6) Repeat the above steps, measure the gap size at three positions on both sides of the bearing, and calculate the average value.

2.Liang County Surveying Method

The crankshaft journal clearance is measured using a special measuring tool. The specific steps are as follows:

(1) Preparation work: Clean the surfaces of the crankshaft journal and crankshaft block, and check whether the surfaces of the crankshaft journal and crankshaft block are smooth.
(2) Push the crankshaft block into the crankshaft journal to make the gap as uniform as possible, but it should not be too tight.
(3) Select the corresponding type of measuring tool and insert it into the two holes on the bearing seat, and insert the fixing pin of the measuring tool.
(4) Rotate the crankshaft to the maximum and minimum clearance positions, and observe whether the indication of the measuring tool is within the appropriate range.
(5) If the measuring tool indication is within the appropriate range, record the reading; if the measuring tool indication is not within the appropriate range, replace the measuring tool with a suitable size for measurement.
(6) Repeat the above steps, measure the size of the gaps at three positions on both sides of the bearing, and calculate the average value. For the ink test method, you need to pay attention to the even coating of the lubricant and the correct use angle of the ink card during operation; For the measuring tool measurement method, it is necessary to select the appropriate measuring tool model during operation and ensure that the measuring tool is inserted and fixed correctly. In addition, for the accuracy of the measurement results, it is necessary to conduct multiple measurements and calculate the average to avoid the influence of individual factors on the results.

Comparison and analysis of detection methods

1. Advantages and Disadvantages
The ink test method and the measuring tool measurement method are both commonly used crankshaft journal clearance detection methods, and they each have their own advantages and disadvantages.
(1) The ink testing method is relatively simple, does not require special measurement tools, and is relatively intuitive to use. However, the judgment of the results mainly relies on the experience of the operator, and there are certain requirements for the selection of lubricating oil.
(2) The measuring tool method requires the use of special measuring tools, which is more accurate. However, it requires more complex operating procedures and relies on the accuracy of the measurement tool.
2. Application scenarios
(1) For some simple crankshaft bearings, or if the results are not very demanding, you can choose the ink test method for testing.
(2) For some precision crankshaft bearings, or where the results are required to be higher, it is recommended to use the measuring tool measurement method for testing.
After comprehensively comparing the two methods, the appropriate detection method can be selected according to the specific situation to ensure the accuracy and reliability of the crankshaft journal.

Precautions for testing

Based on the comparison and analysis of the ink test method and the measuring tool measurement method, some suggestions and improvement directions can be put forward to further improve the efficiency and accuracy of crankshaft journal clearance detection.

(1) When using the ink test method, you can choose lubricating oil with better lubricating properties to improve the reliability of the test results.
(2) Record and analyze the detection results of crankshaft journal clearance, and establish a suitable database for subsequent data analysis and statistics.
(3) For the measuring tool measurement method, you can try to introduce more advanced measurement tools and technologies to improve the precision and accuracy of measurement. According to actual needs and specific conditions, choosing an appropriate crankshaft journal clearance detection method is crucial to ensuring the quality of the mechanical manufacturing process. and reliability are very important. . Through the ink test method and measuring tool measurement method, the crankshaft journal clearance can be effectively detected, and corresponding measures can be taken in a timely manner to ensure the normal operation and safe use of mechanical equipment.

Summary: Use the ink test method and the tool measurement method to measure the crankshaft journal clearance. These two methods have their own advantages and disadvantages. The ink test method is simple and easy, but the results are affected by the operator’s experience, vision, and judgment; measuring tools The measurement method is highly accurate, but it requires special gear, and the use process is relatively complicated. In actual work, it is very important to choose the appropriate measurement method according to the situation. I hope this article will help readers understand the ringing between the journals of Scorpionfish. Detection is helpful, and readers are also encouraged to innovate and improve in practical applications and contribute to the development of the field of machinery manufacturing.

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