With the continuous development of society, a high-rise building stands on the periphery of my life. However, it is also common for construction sites to cause dangerous events every year in the construction industry. In order to ensure the safety of personnel, construction materials, and construction details at the construction site, a video surveillance system is used to supervise and guarantee construction safety in real time. Due to the inconvenience of pulling on the site at the construction site, the back and forth of the vehicle and the excavator, and the difficulty in breaking the cable, the continuous rise of the tower crane also leads to the difficulty of wiring, so the wireless high-definition video transmission system will be adopted, and the wireless video transmission will be convenient and quick. Effective management work.
17 wireless monitoring stations need to be installed at the construction site. 8 and 9 network HD cameras are installed on the left and right sides of the construction site. The central engine room is located at the center and is separated from the monitoring points on both sides by 1 km. The video is unobstructed, and the outgoing call adopts the nearest outgoing call. The left 8 sets of cameras are integrated by the switch every 4 sets. The 5.8G digital wireless transmission device WS-5M12 is used for transmission. After the 8 cameras are integrated, there are a total of two WS-5M12s. Launched to the center room. Each of the nine right cameras is integrated through switches. A total of three digital wireless video transmission devices, the WS-5M12, are launched into the center room.
Two digital wireless video transmission WS-5M12s are installed in the center room location, and each side performs point-to-multipoint reception on both the left and right sides, and then enters switches and NVR storage videos in the central computer room.
Customer's specific requirements for wireless video surveillance transmission equipment
In order to strengthen the scientific construction of safe construction, improve the efficiency of project management, and prevent the occurrence of safety accidents and property losses, an advanced video surveillance safety management system needs to be established on site. Due to the restrictions of the construction site environment, it is inconvenient to slot and route, which is not suitable for traditional cable monitoring methods. However, video surveillance systems must be installed on site. And the equipment can work stably for a long time, dustproof and waterproof, and achieve a complete set of perfect wireless transmission HD systems and real-time monitoring.
Wireless video surveillance project design ideas:
According to the needs of customers, our company has designed a set of advanced digital wireless video surveillance systems. The entire system uses our company's 5.8G band (WS-5M12 built-in 12DB dual-polarization directional antenna) industrial-grade digital wireless video transmission equipment.
In the front-end bridge construction site, 17 high-definition cameras and 5 WS-5M12 digital wireless transmission equipments are respectively transmitted and transmitted to the back-end monitoring room board room for reception. The receiving station uses 2 WS-5M12 units to make one pair of 3, 1 pairs. 2 reception. At the receiving end, we will collect the received video signals through a Gigabit switch. Finally, we will enter the NVR on the first floor of the surveillance room through a network cable for storage, video recording, and video scheduling. In this way, the entire installation is very simple, time-saving, and labor-saving. It is convenient to manage and at the same time, it can easily control the control of each image in the monitoring room.
WS- 5W12 installation notes:
1. Before installing the transmitter, we need to determine the location of the monitoring center (ie, the receiver). Since the transmitter we use WS-5890 built-in dual-polarized flat antenna, in order to ensure that the receiver can better receive the front-end transmitter Video signals, so the device's antenna angle should be aligned, and try to keep the transmitter and receiver unobstructed.
2. Connect the bridge and camera. When connecting the device, it is necessary to pay attention to POE's POWER&DATA OUT is to power the bridge, and DATA IN is to connect the device (this interface can connect all RJ45-based network devices, including PC, router, switch, NVR, etc.). CAT 5e or CAT 6 unshielded twisted pair cables are commonly used for connecting equipment cables. According to the site environment, the length of the network cable must also be controlled within the valid range. The cable between the connection device and the POE must be controlled within 70m. .
3. The production of network cables requires the use of a large number of network cables during the physical connection between devices. The production standards of network cables are crucial. Therefore, we use the T568B standard cable production standards: white orange, orange, white-green, blue, white-blue, green, white-brown, and brown; at the same time, straight-through lines (that is, the two ends of the cable are in the same order) are generally used after the cable is finished. Go to the line meter to measure the continuity of the network cable to ensure that each cable meets the standard.
4 network address planning, the device will configure the ip address, MAC address, frequency and other parameters in the factory. Our bridge needs to configure a valid IP address when accessing the user's LAN. Under normal circumstances, the transmission system composed of bridges is a simple local area network. For the later management and maintenance, we can set the front-end IPC, the intermediate bridge, and the back-end NVR in the same subnet.
5. The device is connected to the switch and router. After all the devices are connected and debugged, if the device is to be connected to another LAN for remote access, just connect the receiver's POE DATA IN network cable to the router's LAN port. can.
V. Engineering Wireless Topology:
Welded Heat Exchanger
Welded heat exchanger has a compact structure design, efficient heat transfer performance and convenient and flexible use, which determines that it is born to replace the superior performance of traditional shell and tube heat exchangers.
The all-welded plate heat exchanger has a compact structure design, efficient heat transfer performance and convenient and flexible use, which determines that it has the superior performance of replacing the traditional tube and shell heat exchanger.
All welded plate heat exchanger structure and welding:
1. Appearance and form
The four ports of the all-welded plate heat exchanger are the upper and lower and left and right positions on the side, because the welding process is used, so the frame itself can not be opened.
2. Internal components
The sealing gasket is omitted inside the all-welded heat exchanger, all of which are welded by stainless steel sheets, usually used for high temperature and high pressure conditions, so the thickness of the sheets is 1mm.
