The building intercom system is a device used for high-rise residential buildings, inside and outside apartment buildings, inter-family information transmission, anti-theft door control and alarms for residents to report to the building duty room in an emergency. It is well-received by users with its complete functions, reliable performance, large capacity, beautiful appearance, convenient installation and use, and has been widely used in safe living quarters.
The visitor can conveniently call and talk to the household through the host in front of the downstairs unit. The household is open and closed at the indoor control unit door. The host of the community can receive the resident alarm signal at any time and send it to the duty host to notify the community security personnel. It not only enhances the safety and security of high-rise residential buildings, but also greatly facilitates the residents and reduces the unnecessary troubles of going up and down the building.
Second, the working mode of the video intercom system
The door is always locked, so that non-residents can enter the building without permission. The residents in this building can use the key to enter and exit the building freely. When a guest visits, the guest needs to click on the room number of the interviewing host on the intercom keyboard outside the building to call the intercom extension to visit the resident. The owner of the interviewed household makes a two-way or visual call with the visitor through the intercom equipment, and confirms the identity of the visitor through the voice or image of the visitor. After confirming that the visitor can be allowed to enter, the owner of the household uses the unlock button on the intercom extension to control the electronically controlled door lock on the entrance door of the building to open, so that the visitor can enter the building. After the visitor enters the building, the door is automatically locked.
The security department of the residential property management can monitor the working status of the security intercom system of each residential building in the community through the community security intercom management host. If the entrance door of the residential building is illegally opened, the security intercom host or the line fails, the cell security intercom management host will send out an alarm signal and display the content and location of the alarm. The community property management department and the household or household and household can use the system to talk to each other. For example, the property department informs the tenants to pay various fees, the tenants inform the property management department to repair the residential facilities, and the residents call the community management personnel or the neighborhood for help in an emergency.
Lifting Jack
Jack is one of the most simple lifting equipment with lifting height of less than 1 m, using jacking rigidity as a working device, through the top bracket or hold claw in the schedule at the bottom of the light and small lifting heavy lifting equipment.Divide into two kinds, mechanical and hydraulic jack is mainly used in mines, transportation and other departments as vehicle repair and other lifting, support, etc.The structure light and strong, flexible and reliable, one man can carry and operation.
Jack is divided into mechanical jacks and hydraulic jack, principle is different. In principle, the principle of hydraulic jack is based on PASCAL's principle, namely: the liquid pressure is the same everywhere, so, in a balanced system, the smaller piston top pressure is small, and the big pressure on the piston is bigger, it can keep the liquid stationary. Through liquid, so can be different on the different pressure, so that you can achieve the goal of a transformation.We are common to the hydraulic jack is to use the principle to achieve the force transfer.Mechanical jacks, using mechanical principle, in the past after pull (handle, claw namely rotary driving ratchet clearance, pull small bevel gear drive big bevel gear, make weight lifting screw rotation, so that the lifting socket for lifting or falling, and achieve the function of the lifting force. But not as easy hydraulic jack.
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