Hydraulic pressure gauge: the "sensing tentacle" of industrial system
In the huge system of modern industry, as the key power transmission and control device, hydraulic system is widely used in many fields, such as machinery manufacturing, metallurgy, construction, aerospace and so on. The hydraulic pressure gauge, as the core monitoring element in the hydraulic system, is like the "sensing tentacle" of the system, which accurately captures and feeds back the pressure information of the hydraulic system, and plays an indispensable role in the stable operation and security of the entire industrial process.
1, Working principle
The working principle of the hydraulic pressure gauge is based on Pascal's law in mechanics. Its interior is mainly composed of elastic elements, transmission mechanism, indicating device and shell. When the pressure of the measured hydraulic system acts on the elastic elements (such as spring tube, diaphragm, etc.), the elastic elements will produce corresponding elastic deformation. This deformation is amplified by the transmission mechanism (such as connecting rod, gear, etc.) and transmitted to the indicating device, so that the pointer indicates the corresponding pressure value on the dial. For example, for a common spring tube pressure gauge, the spring tube will straighten and deform under pressure, and the displacement of its free end will be transmitted by the connecting rod and gear, and finally transformed into the rotation of the pointer, so as to directly display the pressure.
2, Types and characteristics
1. mechanical pointer type hydraulic pressure gauge: the most common type, which displays the pressure value through the rotation of the pointer on the dial. Its advantages are simple structure, affordable, intuitive reading, no additional power support, suitable for a variety of conventional industrial environments. However, the accuracy is relatively limited, generally at about 1.0-2.5 levels, and the response to small pressure changes is not sensitive enough.
3, Application fields
1. mechanical manufacturing: in all kinds of machine tools and equipment, the hydraulic system is used to control the movement of the workbench, the feed of tools and other key actions. The hydraulic pressure gauge monitors the pressure of the system in real time to ensure the stability of the pressure in the processing process and the processing accuracy and surface quality of the parts. For example, in a precision grinder, precise pressure control can make the grinding wheel grind the workpiece evenly and avoid grinding defects.
2. metallurgical industry: in the rolling, forging and other processes of steel production, the hydraulic system provides powerful power for large equipment. The hydraulic pressure gauge helps the operator accurately grasp the pressure state of the hydraulic system to prevent equipment failure caused by too high or too low pressure, affecting production efficiency and product quality. For example, in the rolling mill, the stable pressure ensures the uniform rolling thickness of the steel.
3. Construction Engineering: hydraulic jack, concrete pump and other construction equipment rely on hydraulic system to provide power. The hydraulic pressure gauge can monitor the pressure when the equipment is working to ensure the construction safety and smooth progress of the project. For example, in the construction of high-rise buildings, the concrete pump delivers the concrete to the specified height through the hydraulic system, and the hydraulic pressure gauge ensures the stability of the conveying pressure and prevents accidents such as pipe blockage.
4. Aerospace: the hydraulic system plays a vital role in the key parts of aircraft landing gear retraction, flight control system and propellant delivery of rocket engine. The high-precision hydraulic pressure gauge provides an important guarantee for the safe and reliable operation of aerospace equipment, and ensures the accurate control of system pressure under extreme conditions.
4, Maintenance
1. regular calibration: to ensure the measurement accuracy, the hydraulic pressure gauge needs to be calibrated regularly. The calibration cycle is generally determined according to the frequency of use and working environment, usually half a year to one year. By comparing with the standard pressure source, the error of the pressure gauge is adjusted to ensure the accuracy of its measurement results.
2. overload prevention: during use, the pressure of the hydraulic system should not exceed the range of the pressure gauge, so as to avoid damaging the elastic components, resulting in inaccurate measurement and even scrapping of the pressure gauge. Safety valves and other protective devices can be installed in the system to prevent abnormal pressure rise.
3. cleaning and protection: keep the pressure gauge clean to prevent dust, oil and other impurities from entering the gauge and affecting its normal operation. For pressure gauges used in harsh environments, protective measures should be taken, such as installing protective covers, using waterproof and dust-proof pressure gauges, etc.
4. inspection and maintenance: regularly check whether the pointer of the pressure gauge rotates flexibly, whether the dial is clear, whether the connecting part is loose, etc. If any abnormality is found, it shall be repaired or replaced in time.
As the "eye" of the hydraulic system, the hydraulic pressure gauge, with its accurate pressure monitoring and reliable performance, escorts the efficient and safe operation of modern industry. With the continuous progress of science and technology, the technology of hydraulic pressure gauge is also in continuous innovation and development. In the future, it will play a more important role in more fields and help the industry to a higher level.
Specifications
| PROJECT NO |
Parameter details |
| accuracy class |
Level 1.0, 1.6, 2.5, etc. the smaller the value, the higher the accuracy. For example, level 1.0 means that the maximum allowable error is ± 1.0% of the range. |
| Range |
From small range such as 0-0.1MPa to large range such as 0-100MPa, or even higher. It can meet different pressure measurement requirements, such as 0-1.6Mpa range for low-pressure hydraulic system and 0-60MPa or above range for high-pressure system. |
| Dial diameter |
Common sizes are 60mm, 100mm, etc. It is suitable for places with limited space, and the large dial is convenient for long-distance observation or harsh environment. |
| Measuring medium |
It is suitable for non corrosive or weakly corrosive media such as hydraulic oil, water and air. If measuring highly corrosive medium, pressure gauge of special material shall be selected. |
| Connecting thread |
Standard specifications such as M14 × 1.5 and M20 × 1.5 ensure reliable connection with pipes or equipment. |
| Shell material |
Most of them are carbon steel, stainless steel, etc. Carbon steel has low cost and strong corrosion resistance of stainless steel, which is suitable for different working environments. |
| operation temperature |
'-40 ºC ~70 ºC, beyond which the measurement accuracy and service life may be affected. |
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FAQ
1. question: what should be paid attention to when installing the hydraulic pressure gauge?
Answer: it should be installed vertically in a position convenient for observation, and there should be no strong vibration at the installation place; The connection shall be well sealed to prevent leakage; Avoid installation in high temperature, humidity or corrosive gas environment.
2. problem: what is the possible reason for the inaccurate reading of the hydraulic pressure gauge?
Answer: the elastic element may be damaged due to over range use; Long term use is not calibrated and components are aging; It may also be that the measuring medium has impurities, blocking the internal channel of the pressure gauge.
3. problem: what should I do if I find that the pointer of the hydraulic pressure gauge does not return to zero?
Answer: first check whether the pointer is stuck, and then gently tap the case to see if it can be restored; If not, the elastic element may be deformed or damaged. It is necessary to replace the pressure gauge with a new one.
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