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Type and internal structure of lifting surveillance cloud platform

Time:2021-02-01 View:

The PTZ is an installation platform consisting of two AC motor, which can move horizontally and vertically. However, attention should be paid to the difference from the pan-tilt concept in photographic equipment. Generally speaking, the tripod head of photographic equipment is just a tripod, which can only be adjusted by hand. However, the monitoring system says that the tripod head can remotely control the direction of rotation and movement through the control system. PTZ rotational velocity an important indicator to measure the level of PTZ. The horizontal and vertical directions of the pan-tilt are driven by two different motors, so the rotational velocity of the pan-tilt is also divided into horizontal rotation speed and vertical rotation speed. Due to the load, the torque of the vertical motor during start-up and running maintenance is greater than that in the horizontal direction, and the requirement for horizontal rotation speed during actual monitoring is higher than that of the vertical rotation speed, therefore, generally speaking, the vertical rotation speed of the pan-tilt is lower than the horizontal rotation speed.

According to the use environment, it can be divided into indoor type and outdoor type. The main difference is that outdoor type has good sealing performance, waterproof, dustproof and large load.
According to the installation method, it is divided into side installation and hoisting, that is, whether the PTZ is installed on the ceiling or on the wall.
According to the appearance, it is divided into common type and spherical type. Ball type cradle head is to place the PTZ in a hemispherical and spherical protective cover. In addition to preventing dust from interfering with the image, it is also hidden, beautiful and fast.
According to the movement function, it can be divided into horizontal head and all-round (omnidirectional) head.
According to the working voltage, it is divided into AC fixed speed pan-tilt and DC high speed pan-tilt.
According to the carrying weight, it can be divided into light-load PTZ, medium-load PTZ, and heavy-load PTZ.
According to the load installation method, it is divided into top Mount head and side mount head.
According to the usage environment, it can be divided into general type and special type. General-purpose type refers to the use of non-combustible, non-corrosive gas or dust in the atmospheric environment, and can be divided into use type and room appearance type. The most typical special application is explosion-proof head.

Internal structure
There are two motors inside the omni-directional pan-tilt, which are responsible for the up-down and left-right rotation of the pan-tilt respectively. The difference of its working voltage also determines the overall working voltage of the PTZ, generally including 24V AC, 220V AC and 24V DC. When the up and down action voltage is received, the vertical motor rotates, and the vertical drive is driven by reduction gearbox; When the left and right action voltage is received, the horizontal motor rotates and drives the horizontal tooth reduction gearbox at the bottom of the pan head to rotate through the roulette wheel. It should be noted that the PTZ has horizontal and vertical limit bolts, and the PTZ has two micro switches to realize the limit function respectively. When the rotation angle reaches the preset limit Bolt, the micro switch operates to cut off the power supply and the pan-tilt stops rotating. The limiting device can be located outside the pan-tilt, and the adjustment process is simple. It can also be located inside the pan-tilt, and the adjustment process is relatively complicated through the adjustment mechanism of peripheral devices. However, the sealing performance of the external limiting device is not as good as that of the built-in limiting device.
Outdoor pan-and-tilt is generally the same as the indoor PTZ, but because the weight of outdoor protective cover is relatively large, the load capacity of the PTZ must plus-sized. At the same time, the cold and hot changes of the outdoor environment are large, and they are easily eroded by rain or humidity. Therefore, outdoor pan-and-tilt is generally designed to be sealed and rainproof. In addition, outdoor pan-and-tilt also has high torque and choke protection circuit to prevent the motor from being burned when the pan head is frozen. Under the harsh conditions of low temperature, a temperature-controlled heater can also be installed inside the PTZ.