Thin wall ball bearings are simple in structure and easy to use. Mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of Angular Contact Ball Bearing and can bear combined radial and axial load.
Thin wall ball bearings have a bearing inner diameter and outer diameter ratio less than a specified value. The ratio of bearing outer diameter to bearing inner diameter is 1.25 or less. It is called thin wall ball bearings, which means that the outer diameter-inner diameter value of the bearing is very small and the bearing wall is very thin. Thin Wall Ball Bearing,Thin Section Bearings,Thin Ball Bearing,Thin Wall Bearing Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com
1) Color: The camera has black and white and color. Generally, the horizontal resolution of the black and white camera is higher than that of the color camera, and the black and white camera is more sensitive than the color camera, and is more suitable for places with insufficient light and places with dark night lights. Black and white cameras are cheaper than color. However, the color image is easy to distinguish the color of the clothes and the scene, so that it is timely to obtain and distinguish the real-time information on the scene.
2) Sharpness: There are two kinds of horizontal and vertical definition. The sharpness in the vertical direction is limited by the TV system, and there is a maximum limit. Since the TV signals in China are all PAL, the vertical resolution of the PAL system is 400 lines. Therefore, the clarity of the camera is generally expressed in horizontal resolution. The horizontal definition represents a measure of the human eye's level of detail in the television image, represented by the television line TVL.
At present, the horizontal resolution of black-and-white cameras should generally be greater than 500 lines, and the horizontal resolution of color cameras should generally be greater than 400 lines.
3) Illuminance: The luminous flux received by the unit illuminated area is called illuminance. Lux is the illuminance of a beam of nominal brightness (lumen) that is uniformly incident on the lm2 area. The sensitivity of the camera is expressed by the minimum illumination. This is the camera's specific test card as the pickup target. When the lens aperture is 0.4, the illumination of the light source is adjusted. The amplitude of the video signal at the output of the camera is 10% of the rated value. The measured test card illumination is the minimum illumination of the camera. Therefore, the illuminance of the subject should be about 10 times of the minimum illuminance in order to obtain a clearer image.
At present, the minimum illumination of the black and white camera is generally selected. When the relative aperture is F/1.4, the minimum illumination requirement is less than 0.1 Lux; the minimum illumination of the color camera is selected. When the relative aperture is F/1.4, the minimum illumination requirement is less than 0.2 Lux.
3) Synchronization: The camera is required to have a power synchronization and external synchronization signal interface. For power synchronization, all cameras are powered by the AC phase-in-phase power supply of the monitoring center, so that the phase of the camera airport synchronization signal is locked with the mains to achieve a synchronized phase of the camera synchronization signal.
For external synchronization, it is required to configure a synchronous signal generator to implement forced synchronization, line frequency, field frequency, frame rate signal for television system scanning, and synchronization of the composite blanking signal and the synchronization signal provided by the peripheral signal generator. the way.
Only when the system is in synchronization, the image will not be scrolled when the timing is switched, and the recording and playback quality can be improved.
4) Power supply: The camera power supply generally has AC 220V, AC 24V, DC 12V. The camera power can be selected according to the site conditions, but it is recommended to use safe low voltage. When using 12V DC voltage, it is often impossible to reach the camera.
The requirements for power synchronization must be external synchronization to achieve the purpose of synchronous system switching.
5) Automatic Gain Control (AGC): In the case of low brightness, the automatic gain function can increase the intensity of the image signal to obtain a clear image. The minimum illumination of CCD cameras on the market today is a parameter under these conditions.
6) Auto white balance: When the white balance of the color camera is normal, the color of the subject can be restored. The automatic white balance of the color camera is to achieve its automatic adjustment.
7) Electronic brightness control: Some CCD cameras can adjust the exposure time of the CCD image sensor according to the brightness of the incident light, so that the automatic aperture lens can be eliminated when the light changes greatly. When using electronic brightness control, the depth of field of the subject is smaller than when using an auto iris lens.
8) Backlight compensation: In the case of only backlight installation, when an ordinary camera is used, the image of the subject will be black, and a camera with backlight compensation should be used to obtain a clearer image.
When the speed is high and thrust ball bearings are not suitable, thin wall ball bearings can also be used to bear pure axial loads. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient and a high limit speed. But it is not impact resistant and not suitable for heavy loads.
The precision required by thin wall ball bearings is very high, because the wall is very thin, so the weight it can carry is also very low, and the impact resistance is very poor, so this must be selected according to the use environment!
Characteristics
The specific use of thin wall ball bearings:
Model airplanes, remote control cars, machine tools, motors, water pumps, agricultural machinery, textile machinery, laser printers, instruments, measuring instruments, electronic accessories, motors, motors, etc.
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[ Huaqiang Security Network News ] Some people worry about buying a camera. Today, Xiaobian summed up the eight aspects of selecting a camera to help you choose the right camera for you. The main part of the camera section is a camera whose function is to observe and collect information. The performance of the camera and its installation are important factors in determining the quality of the system. The light pipe camera has been eliminated and replaced by a charge coupled device called a CCD camera. Its main performance and technical parameters are as follows: