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High-pressure hoses are used in hydraulic supports in mines, oil field development, construction projects, lifting and transportation operations, metallurgical forging, mining equipment, ships, injection molding machinery, agricultural machinery, various machine tools, as well as in the mechanical and automated hydraulic systems of various industrial sectors. They serve to transport petroleum-based liquids (such as mineral oils, soluble oils, hydraulic fluids, fuels, lubricants) and water-based liquids (such as emulsions, oil-water suspensions, water) that have certain pressures and temperatures, along with other liquids used for hydraulic transmission. Since it is a high-pressure rubber hose, it must withstand certain pressure inside; whether its inner and outer diameters meet the standards is very important for withstanding such pressure. This article mainly focuses on the automatic detection of the outer diameter of high-pressure hoses. A laser single-axis diameter measuring instrument can provide real-time control over the outer diameter of the high-pressure hose being measured. The instrument is equipped with a set of photoelectric sensors that allow it to determine the diameter of the object under inspection. It has functions such as display, calculation, and alarm, as well as audio-visual alarm capabilities that trigger automatically when the measured data exceeds the specified limits. Technical specifications: 1. Display content – real-time measurement values, with a data refresh rate of 1 to 3 times per second. 2. System functions: It is possible to set product specifications, positive and negative tolerances, as well as the activation status of alarms, etc. 3. Alarm function: When the measured data exceeds the specified range, an alarm red light turns on to give a warning. 4. Data output interface: RS422 or RS485 (negotiable between the parties); software can be installed to display measurement data in real time along with graphs of data fluctuations. 5. Control functions: Online control capabilities allow for the control of traction or other functions; the single-channel diameter measuring device can quickly detect the outer diameter of high-pressure hoses. The integration of detection and control functions provides an excellent experience for production processes.