HS code correlation with duty rates

List of the contents of this article:

• 1,HS code correlation with duty rates Seeking Siemens PLC Elevator System Design
• 2 、 What are the design schemes for villa elevators? Introduction to the villa elevator schemes?
• 5, How to design an elevator system for a 300-story skyscraper?

Seek Siemens PLC elevator system design

The elevator control system is mainly composed of speed control part and logical control part. The performance of the speed control part plays an important role in the comfort of passengers during elevator operation. At present, most of them use high-performance frequency converters to measure the speed of the induction motor using rotary encoders to form a closed-loop vector control system.

The hardware structure diagram of the hardware structure system is shown in Figure 1. PLC is Siemens' S7-200 series CPU221. PLC receives the summoning signal from the control plate and each layer of the elevator box, the functional signal of the car and door system, and the status signal of the shaft and frequency converter, and realizes the selective control of the elevator through program judgment and calculation.

Software: step7 Hardware: Siemens 300, 400 series Components: self-reset button start, stop switch, corresponding to I0.0, I0.1 respectively; motor start output Q0.0; use S_ODTS timer, start delay 5S, stop delay 10S.

PLC is Siemens S7-200 series CPU221, PLC accepts from the control disc andThe summoning signal of each floor of the elevator box, the functional signal of the carriage and door system, and the status signal of the well channel and frequency converter are realized through program judgment and calculation to realize the selection control of the elevator.

Hardware design of elevator 1 Hardware configuration of elevator control system This system is an AC variable frequency conversion speed control system mainly composed of PLC, frequency converter, control box, display and drag motor (Variable Voltage Variable Frequenc Y, abbreviated as VVVF).

After saying that, except that it can't carry people, the control is the same as the actual elevator, and the actual test is completely passed. However, I haven't had the opportunity to develop into a single film since graduation, and I have almost forgotten this. It is even more necessary to use PLC. The comparison between PLC and assembly is really stupid.

PLC-based elevator control system design

1. PLC first receives the escalator signal and flat signal from the elevator, and then according to the state of these input signals, through a series of complex controls within its The program processes the logical relationship of various signals in an orderly manner, and finally sends switching volume control signals to DC gate motors, frequency converters and various displays in a timely manner to control the elevator.

2. This design takes into account the actual operation function of the passenger elevator, and also takes into account the recursive function in the elevator control. The designed control system is aimed at the four-story elevator.

3. PLC control replaces traditional relay control. PLC is a new automatic control device integrating computer control, automatic control technology and communication technology.

4. Combined with the control of the five-story elevator, select FX2N-64MRPLC as the controller, and select the dual-phase dual-count input high-speed counter C254 as the positioning counter of the car. The A-phase pulse input terminal is X000, the B-phase pulse input terminal is X0001, the reset terminal is X0002, and the external start-up terminal is X0006.

5. On the basis of introducing the basic structure of the elevator, the working principle of the elevator is deeply analyzed, the advantages and characteristics of PLC are explained, the hardware design and software design of the elevator are analyzed, and the implementation plan based on the PLC elevator control system design is studied and put forward. Finally, the research of this paper The content of the investigation is summarized and forecasted.

6. The technical indicators you mentioned are the current elevator system compliance.What are the main indicators of the country, or your research method is actually to use PLC control to realize the only control of the elevator! You need to search for other specific content on the Internet. There should be a lot of this.

Eight elevator systems

1. General elevators are mainly composed of the following eight systems: power dragging system power The function of the drag system is to provide power and implement elevator speed control.The electric drag system is composed of a traction motor, a power supply system, a speed feedback device, a motor speed regulation device, etc.

2. Traction system: The main function of the traction system is to output and transmit power to make the elevator run. Guidance system: The main function of the guidance system is to limit the freedom of movement of the carriage and the weight, so that the carriage and the weight can only move up and down along the guide rail. The guide system is mainly composed of guide rail, guide boot and guide rail frame.

3. The elevator shaft wall is equipped with a guide rail, which and the guide boots on the sedan compartment limit the movement of the carriage. The elevator system includes eight systems, namely traction system, guidance system, car, door system, weight balance system, drag system, control system and safety protection system.

4. Eight major elevator systems: traction system The function of the elevator traction system is to output power and transmit power to drive the elevator to run.It is mainly composed of towing machine, towing steel wire rope, guide wheel and reverse rope wheel. The drag machine provides power for the operation of the elevator and is composed of an electric motor, a pull wheel, a coupling, a reducer, and an electromagnetic brake.

What are the design schemes for villa elevators? Introduction to the villa elevator schemes?

1. Villa elevator design - hidden design This is a villa elevator design with high practicality. The elegant and simple tone and simple lines make it feel simple at first glance, but it also has a warm and soft texture when you look closely. In particular, the elevator door, which is made into an ordinary indoor door style, has achieved the effect of hiding the elevator entrance.

2. Xunda home villa elevator adopts precise quietSound control system, 32-bit CPU hybrid chip main control system, building an intelligent basic platform for elevators, stable safety performance, higher reliability and comfort.

3. The closed well passage is equipped with a closed carriage, and the sightseeing well path is equipped with a sightseeing carriage. You can go sightseeing on three sides or partial sightseeing. It is recommended to install glass windows on the door. The car has a variety of shapes. Rectangular, round and combined types are all available. It is recommended to use automatic folding doors with transparent materials.

How to design an elevator system for a 300-story skyscraper?

One way to solve this problem is to make the building flat.

The ideal solution is that two shuttle service elevators go directly from the underground to the lobby, and the other four service elevators run from the air lobby to the roof of the guest room.The service floor of the podium elevator is small, and the flow can be diverted by setting up a sufficient number of escalators (the escalator carrying capacity can reach 9,000 people/hour) without too much discussion.

Principles of elevator configuration: estimate the number of users of the building, determine the 5-minute carrying capacity requirements, and determine the escalator waiting time requirements.

The first thing that needs to be considered is the determination of the distribution and transformation system and the emergency power supply system and the access of the self-provided power supply system, including the establishment of the power supply voltage level, the establishment of the normal power supply system, the selection of self-provided emergency power supply system equipment, and the reasonable and effective access of the self-provided emergency power supply system to the main system, etc. All questions need to be paid attention to.

Evelator is the core class of the whole elevator system, which mainly has the following attributes and methods: attributes: squareMethod: First of all, we assume that we press the 6th layer first, and then press the 2nd layer after reaching the 3rd floor. If you put 2 in a queue, you can't take the largest or the smallest.

The floor that restricts the elevator to reach: please ask the elevator maintenance company to set it in the system. Install electronic clock control on the call button signal inside and outside the elevator.