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What are the types of closed machines?

Edit:Xinertai Hydraulic MachineryUpDate:2019-06-14

  Screw hoist

Can be divided into: dual-purpose screw hoist with flashlight, hand-push screw hoist, side rocking hoist, manual screw hoist, etc. The threaded rod is directly or through the guide slider, connecting rod and gate The door leaves are connected and the screw moves up and down to open and close the gate. The screw rod is supported in the load-bearing nut, and the nut and transmission organization (bevel gear drive or worm gear drive) are fixed on the support frame. Turn on the power supply or use a human hand crank to drag the transmission organization, drive the load-bearing nut to rotate, and make the screw lift to open and close the gate. The screw is a compression rod, and the stability of the compression rod should be calculated when the downforce is required to force the gate to drop. The screw hoist has a simple structure, strong and durable, low cost, suitable for small flat gates and arc gates, and its opening and closing force is generally below 200kN. Large-capacity screw hoists of 500kN and 750kN have also been produced for the operation of flat gates and arc gates of diving holes.

Fixed hoist

Regarding the construction engineers of water conservancy projects, they will be exposed to the construction of sluices. However, how to install the hoist during the construction of sluices? What are the requirements for fixed hoist devices?

Regarding the fixed hoist, the device is mainly based on the lifting center of the gate, the longitudinal and lateral error interval should not be less than 3 mm, the horizontal error should be less than 0.5 thousandths, and the elevation error can reach 5 mm. In the process of connecting the screw and gate of the screw hoist, the straightness error treatment will not exceed 0.5 per thousand; we also need to conduct a comprehensive inspection and inspection work when the hoist is installed. The open gear and the bushing should be fully rotated, and the oil and iron filings should be cleaned in the rotating place. The first is to remove the dust, add new oil, and follow the instructions of the gearbox. The device must be refueled and the regular oil level handled in accordance with the product manual. When we are positioning the hoist, the foot bolts at the bottom of the frame must be treated with concrete irrigation, and the base and concrete must be filled with cement mortar. During the installation process of our door machine, a comprehensive inventory and investigation are carried out, and the components of the machine must be installed. During the installation process, the error must conform to the relevant rules of the drawing. If there is no accurate rule, you can refer to it. Corresponding requirements shall be implemented; regarding the trajectory device of the door machine, if there is an error in the assembly of the door, the installation should be carried out according to the rules in the drawing and the manufacturer's manual.

Hoisting hoist

A machine that uses a steel cable or a steel cable pulley group as a sling to connect with the gate, and through a gear transmission system to make the hoisting drum wind and put the steel cable to drive the lifting machine (Figure 2), also called the fixed steel wire rope hoist. It has a relatively simple structure, easy to manufacture, convenient maintenance and repair, and is widely used for opening and closing various types of gates. The hoist hoist is divided into single lifting point and double lifting point. Double lifting point hoisting hoist is to connect two single lifting point hoist together through a connecting shaft for synchronous operation, which can be made into one-side drive or two-side drive. The hoisting hoist is usually a gate with a hoist, installed on the gate pier above the top of the gate slot. The capacity of the hoist hoist that has been produced and put into operation in my country has reached: opening force of 6000kN, opening and closing stroke of 30m, opening force of 4000kN, and opening and closing stroke of 120m.

Hydraulic hoist

The gate hoist is used to connect the piston rod to the gate and push the piston to raise and lower the gate by hydraulic pressure. The liquid generally uses mineral oil, so it is often called hydraulic hoist. The high-pressure oil is delivered by the oil pump through the pipeline. The hydraulic hoist has a simple body structure, small footprint, stable transmission, convenient operation, and high manufacturing precision. It is widely used for opening and closing various types of gates. The main components of hydraulic hoist include: piston rod, hydraulic cylinder, oil supply and discharge pipeline system and oil pump motor unit (Figure 3). According to the force of the piston rod, it is divided into one-way effect hydraulic hoist and two-way effect hydraulic hoist. The gate can be closed by its own weight, and a one-way hydraulic hoist can be selected; when the gate cannot be lowered smoothly by its own weight, the upper part of the door needs to be pressured to be closed, and a two-way hydraulic hoist is used. The force conditions and hydraulic operating system of the two-way hydraulic hoist are messy, but the arrangement is compact, and the additional components (such as weight blocks) required for gate drop can be omitted, and it is mostly used for the operation of down-the-hole high-pressure gates. The gate of double lifting point can be operated synchronously with two hydraulic hoist of the same type. The opening force of the hydraulic hoist produced in my country has reached 6000kN. The hydraulic hoist used by the Soviet Union in the power station has an opening force of 9000kN and a lowering force of 11100kN.

Mobile hoist

A mechanical device that moves along a specially laid track and can successively lift several gates arranged in rows or columns. The types of mobile hoist are complicated, mainly including:

①According to the moving direction of the spreader, it is divided into one-way mobile hoist and two-way mobile hoist. The former spreader only moves left and right along the dam surface line; the latter not only moves left and right along the dam axis, but can also move up and down.

②According to the mobile frame, it is divided into trolley mobile hoist and portal mobile hoist (also known as portal hoist, portal crane).


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