With the rapid developments in tunnel traffic infrastructure construction, engineers need a portable and real-time system to obtain the tunnel deformation during construction. An automatic and wireless real-time tunnel deformation monitoring system, which is based on laser and machine vision and can give early warnings for tunnel collapse accidents, is proposed. The proposed system uses a fixed laser beam as a monitoring reference. The image acquisition modules mounted on the measured points receive the laser spots and measure the tunnel accumulative deformation and instantaneous deformation velocity. Compensation methods are proposed to reduce measurement errors caused by laser beam feasibility, temperature, air refraction index, and wireless antenna attitude. The feasibility of the system is verified through tunnel tests. Tunneling Face Monitoring System Mining Monitoring System,Tunneling Face System,Tunneling Face Monitoring,Tunneling Face Monitoring System Jinzhou Jinshi Mining Equipment Technology Co., Ltd. , https://www.jsminingeqpt.com
The miniature vacuum pump for object adsorption, in fact, the suction pump suction cup sucked objects, therefore, must choose the true sense of the miniature vacuum pump, such as VAA, PK, PC, VCA, VCH, PH and other products See:
How to calculate the suction force of the miniature vacuum pump and its calculation formula can be found in:
1. In addition to considering the degree of vacuum, but also consider the pump connected to the suction cup area, because the pump end of the gas pipe is easy to leak, so the general object to be sucked suction cup to keep the vacuum.
2. To see what kind of object adsorption (1) vertical adsorption If the pump is in the upper adsorption of objects, this is the easiest way.
It is mainly the pumping force provided by the pump to counter the gravity of the object, it is necessary to know the weight of your object and the area of ​​the suction cup to be used (referring to the effective contact area of ​​the object to be sucked)
Suction = suction pressure * Contact area is obtained
(Unit: kilogram force, and the suction pressure is 0.01 * (100 - vacuum degree of vacuum pump (absolute pressure)), in kilograms force / square centimeter, contact area unit: square centimeter)
Selection principle:
In this case, the same area of ​​the suction cup,
â‘ fruit adsorption object lighter, you can use PK5008 (): F = 0.01 * (100-50) * 1 = 0.5Kgf / cm2 that can lift 0.5 kg per square centimeter;
â‘¡ if it is medium weight, optional PH2506B, PC3025N ():
F1 = 0.01 * (100-25) * 1 = 0.75 Kgf / cm2 (0.75 kg per square centimeter respectively)
F2 = 0.01 * (100-30) * 1 = 0.70 Kgf / cm2 (0.7 kg per square centimeter)
â‘¢ If heavier, you can choose VCH1028 ():
F = 0.01 * (100-10) * 1 = 0.9Kgf / cm2 that can lift 0.9 kg per square centimeter;
Of course, the same pump can also be used to increase the number of suction cups to increase the overall suction force, but the corresponding time to reach the desired suction force has also increased (due to the increase in the number of suction cups, the volume to be pumped also increases ).
(2) other ways (such as adsorption fixed at the bottom of the object, side plane adsorption, etc.)
The situation is more complicated, because the pump provides a suction force against a variety of forces, such as friction (with the plane of the friction coefficient) and so on, you need to pump into the system, combined with the specific circumstances of the test. Of course, the selection of the pump can still refer to the above principle: only the margin left, need more.
Micro-vacuum pump for the adsorption of objects should pay attention to the type of problem
Micro-air pump is often used in industries such as scientific research, medical treatment, laboratory, instrumentation and so on to adsorb objects. However, miniature air pumps have many forms, such as miniature vacuum pump, gas sampling pump, micro gas circulation pump and mini suction pump. How to choose it?