Highway brake is composed of reducer, motor or hydraulic transmission mechanism, balancing device, chassis, brake lever bracket, brake lever and other parts.
Gate is a control facility used to close and open drainage channels. As an important part of hydraulic structures, it can be used to intercept water flow, control water level, regulate flow and discharge sediment and floating objects. Gate is generally composed of movable parts (also called door leaves), embedded parts and hoist mechanism. Door leaf includes: load-bearing structure, walking support, arm, hinge, water stop device, lifting lug, etc. Embedded parts include: track, hinge seat, water stop seat, corner protector, etc. Commonly used lifting machinery are: winch, hydraulic, screw and mobile machinery. There are many classification methods of gates, including: according to the working nature of gates, they can be divided into working gates, maintenance gates and emergency gates. The working gate, also known as the main gate, can be opened and closed in running water. The service door is arranged in front of the service door. It is used for short-term water retaining during the maintenance of buildings or working gates, and is generally opened and closed in still water. Emergency gates are mostly set in front of deep-hole working gates. When buildings or equipment have accidents, they can be closed in running water and opened in still water. When it is also used as a maintenance gate, it is also called an accident maintenance gate; Emergency gates that need to be closed within a limited time are called quick gates. According to the relative position between the gate top and the water surface when the gate is closed, it can be divided into open gate and submerged gate. According to the appearance and shape of the door leaf, it can be divided into plane gate, arc gate, herringbone gate, arch gate, spherical gate and cylindrical gate. According to the data of manufacturing door leaves, they are divided into steel doors, copper cast iron doors, wooden doors, reinforced concrete doors and composite doors. In addition, some gates, such as flap gates, can be automatically opened and closed by hydraulic power, which is called hydraulic automatic doors. The selection of gate form needs to consider its position, size, design head, operating conditions, manufacturing capacity and installation technology level in hydraulic structures, and requires good water flow conditions, tight water seal, small opening and closing force, simple and flexible operation and convenient maintenance. Plane gate and arc gate are the most commonly used gate types. Among the working gates, large open-top gates and high-head down-the-hole gates are mostly arc gates, while miter gates and transverse pull gates are mostly used for ship locks, and plane gates are generally used for maintenance gates and emergency gates. The materials used to manufacture door leaves in modern times are mostly steel, and reinforced concrete is mostly used as a blocking gate that needs to close the bottom hole of construction diversion by its own weight. In addition, the control facilities used in pressure pipeline, which integrate door leaf, shell and hoist mechanism, are commonly called valves.
The gate is installed on the air interface of overflow dam, shore spillway, spillway, hydraulic tunnel, sluice and other buildings, and is used for regulating flow, controlling upstream and downstream water levels, discharging flood, removing sediment or floating objects, etc. , is an important part of hydraulic structures. In sluice engineering, sluice is the main part, which often accounts for most of the water retaining area. Gates are divided into flat gates and arc gates.