Is Huijin a digital currency

1.

The main concept stocks of digital currency include Hailian Jinhui, Julong, Huijin, radio and television express, digital certification, Kunlun wanwei, gaoweida, Huali chuangtong and high beam software

from the perspective of financial institutions' layout of digital currency concept stocks, according to the No.1 Institute of finance, among the relevant stocks that have disclosed the annual report of 2019, as of the end of the fourth quarter of last year, five stocks were heavily held by institutions such as insurance capital, securities companies and funds, with a total market value of 24.3 billion yuan

in terms of research on financial institutions, No.1 Institute of Finance found that six digital currency concept stocks, namely, radio and television express, digital certification, Kunlun wanwei, gaoweida, Huali chuangtong and Gaoguang software, have been intensively researched by institutions this year, with a total of 163 times of research

an equity investor of an insurance company told the No.1 Institute of finance that at present, the insurance capital still pays attention to the large cap stocks with "low wave dividend" (stocks with high dividend and low performance fluctuation), and still holds a wait-and-see attitude towards popular concept stocks such as digital currency, but does not rule out the subsequent purchase

extended data

digital currency can be considered as a virtual currency based on node network and digital encryption algorithm. The core characteristics of digital currency are mainly reflected in three aspects: because it comes from some open algorithms, digital currency has no issuing subject, so no one or institution can control its issuing

because the number of algorithm solutions is determined, the total amount of digital currency is fixed, which fundamentally eliminates the possibility of inflation caused by excessive virtual currency; Because the transaction process needs the approval of each node in the network, the transaction process of digital currency is safe enough

The emergence of bitcoin poses a great challenge to the existing monetary system. Although it belongs to the generalized virtual currency, it is essentially different from the virtual currency issued by network enterprises, so it is called digital currency

this paper compares digital currency with electronic currency and virtual currency from the aspects of issuing subject, scope of application, issuing quantity, storage form, circulation mode, credit guarantee, transaction cost and transaction security

2. Introction: Wanxiang blockchain is a blockchain related company invested by Wanxiang blockchain
legal representative: Jiang Jiaqian
time of establishment: February 16, 2017
registered capital: RMB 1.1 million
Instrial and commercial registration number: 310114003240381
enterprise type: limited liability company (invested or controlled by natural person)
address: room j1142, building 7, No. 328, jiajiangong Road, Jiading District, Shanghai

3. Before investing, you must know more about the market trend and price fluctuation. The app of fire coin has a good evaluation in the instry and a good reputation. I was also introced by my colleagues. It's mainly known by people in the circle that the trade of fire coin here is relatively large. You can download the software first and use it for a period of time.

4. If you do Android automated testing, you mainly study java. If you just do automated testing, you learn python, because Python can do more than Java in automation

5.

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on Feizhu, you can also see more about the introction and play methods of the three rooms of Hongbo Convention and Exhibition Center longta Yellow River Park, as well as the surrounding scenic spots

7. The graation project of the special machine tool for roller processing

foreword
college life is coming to an end, and we are about to go to the society and our own jobs to meet the rich and colorful society full of competition
in the past three years, we have learned dozens of professional courses and basic courses, which enable us to understand some basic knowledge and principles of the mechanical major, and provide reference for further consolidation and innovation We should expand and deepen our basic theories, integrate the knowledge we have learned in the past three years, and improve our ability to comprehensively adapt to knowledge. Test our learning outcomes. We finished the graation project under the guidance of our tutor
the design topic of our group is "special machine tool for idler processing", which is a special machine tool for idler proction. My task is the design of machine bed, guide rail and clamping system, as well as the design of hydraulic transmission principle. Xiao Dechun and Wu Yongtao and I worked together on this topic. In order to ensure the quality of design, we have made in-depth and detailed investigation and research in the crane machinery factory, roller conveying and processing factory and other manufacturers for many times. We are familiar with the proction process and equipment conditions, visited some workers and technicians, and asked them about some problems existing in the proction process and the solutions, so as to obtain first-hand information, For us to successfully complete the graation project has laid a good foundation. However, e to my limited knowledge and ability, I still encountered some problems in the design. Therefore, we consulted a large number of technical materials and reference books. After repeated demonstration and comparison, we finally determined the design scheme. After roughly allocating the time, we started our respective work
the special processing machine designed in this paper is based on the traditional processing machine and hydraulic control system, which has transformed the tightening system and redesigned the radial tool passing system. The purpose of this transformation is to make it more accurate and fast in the processing process. In the design process, I also realized that our country's technology is relatively backward, Many advanced technologies and materials can not be applied in our country. As a college student who is about to graate, I feel that there is a long way to go
this design has further improved my theoretical level, enhanced my ability of practical work, and deepened my understanding of what I have learned. It is undoubtedly of great help to my future work. Although the design has consulted a lot of information, there must be some mistakes in the design. We have to ask teachers and students to help us correct them, so as to improve and improve in the future<

1 overall design scheme of machine tool
in the current instrial and agricultural proction process, belt conveyor is widely used, and its idler is a multi-purpose part and vulnerable part of belt transportation. As a large belt conveyor needs at least thousands of idlers, it is said that it is multi-purpose parts. As for the vulnerable parts, because of the poor working environment, they are severely damaged by external factors, and their own vibration and wear are more serious when working. Therefore, the idlers need to be proced in large quantities to meet the needs of factories and mining enterprises
1.1 analysis of processing technology
it can be seen from the part drawing of idler that the surface roughness of bearing hole 102 at both ends of roller is ra = 6.3nm, with lower grade, while the requirements for cylindricity and coaxiality are higher. In addition, the wall thickness is 5mm, which belongs to thin-walled parts. Therefore, the following problems must be solved in the design of the machine tool:
1. The position of the hole must be correct. Avoid too large deviation between the empty axis line and the axis line of the pipe body. 2. Ensure the cylindricity of the hole. If the cylindricity out of tolerance is too large, the bearing assembly is more difficult
3. Ensure the coaxiality of the holes at both ends. If the coaxiality is out of tolerance, the idler can not rotate evenly after assembly, so that the service life of the bearing, belt and drum will be reced
4. The surface roughness must be guaranteed, otherwise the matching with the bearing bush will be affected. When the cylinder wall works, the force is uneven, which will accelerate the damage of the cylinder
5. When machining, the clamping force should be suitable, the action point of the direction should be appropriate, and the action should be uniform. Otherwise, it is easy to cause workpiece deformation, so the scrap rate of processing is bound to rise, resulting in higher cost and poor economy
through the above analysis, we need to design the machine tool and fixture to meet the above requirements as far as possible< 1.2 determination of processing scheme
there are many kinds of processing methods on the machine tool. According to the characteristics and processing requirements of the idler, it is obvious that only turning or boring methods can be used. The specific scheme is determined as follows:
the first scheme: single head turning (as shown in Fig. 1-1)
working process: the workpiece rotates, the cutter feeds in a straight line, The advantage of this scheme is simple, compact and easy to manufacture. The disadvantage is that it needs to be clamped twice in the process of processing, and the outer circle is an unprocessed surface. After turning around, the workpiece may rotate around two rotary axes, which can not guarantee the coaxiality of the inner and outer circles, increase the clamping time and rece the proction efficiency

Fig.1-1 single head car
1, bed 2, headstock 3, three jaw chuck 4, workpiece
5, tool 6, arbor 7, slide box 8, guide rail
Fig.1-1 single truck
1, lathe bed 2, spin box 3, scroll chuck 4, workpiece
5, tool 6, arbor 7, slip box 8 Guide

the second scheme: two end car (as shown in Fig. 1-2)
when using this scheme, the workpiece is required to be stationary, the cutter rotates and feeds at the same time, and the two ends are processed at the same time. The advantages of this scheme are that the workpiece is installed at one time, the two ends are processed at the same time, the process is concentrated, the proction efficiency is high, and the coaxiality of the outer circle of the workpiece can be ensured. The disadvantage is: because both ends are processed at the same time, a large clamping force must be required. If the fixture is used to locate the cylindrical surface, it will cause the cylindrical surface deformation, destroy the cylindrical straightness, and bring errors to the processing<

Fig. 1-2 two end car
1, bed 2, box 3, tool 4, workpiece 5, fixture 6, guide rail
Fig. 1-2 two lathe
1, lathe bed 2, cabinet 3, tool 4, workpiece 5, fixture 6, guide
the third scheme: two end boring (as shown in Fig. 1-3)
this scheme combines the advantages of the above two schemes. First of all, one-time clamping and inner hole processing at both ends can ensure the coaxiality requirements of the inner and outer circles of the workpiece, and the process is centralized with high proction efficiency; Secondly, the workpiece is positioned and clamped by both ends and chamfering. Because the workpiece is a thin-walled cylinder, it will not damage the straightness of the outer circle, so it is easy to ensure the processing requirements. Moreover, the hydraulic rotation eccentric tool can prevent the tool tip from scratching the machined surface when withdrawing the tool. The axial feed of the tool is controlled by stepless speed regulation and contactless switch, and the tool stroke is adjusted by the scale at the end of the tool bar, Clamping also uses hydraulic transmission and non-contact switch limit, so that through the control of hydraulic components and electrical components, it is easy to realize automation and automatic circulation, which can greatly improve labor proctivity and rece labor intensity

Fig. 1-3 two end boring
1, feed cylinder 2, arbor 3, tool 4, main oil tank
5, workpiece 6, fixture 7, bed 8, guide rail
Fig. 1-3 two boring machine
1, feed cylinder 2, arbor 3, tool 4, main oil tank
5, workpiece 6, fixture 7, lathebed 8 Guide

through the analysis and comparison of the above three schemes, this design decided to adopt the third scheme<

2 bed design
2.1 requirements for bed design
bed is the foundation of special machine tool, and is also one of the key parts of special machine tool manufacturing. Many parts and components on the machine tool are loaded on the bed, and some are still moving on the bed guide rail, so the relative position and relative motion accuracy between the relevant parts are guaranteed by the bed, In order to ensure the accuracy of the machine tool and keep the original accuracy of the machine tool for a long time under the influence of various factors, the machine tool is required to have enough rigidity, seismic resistance and wear resistance. Most of these aspects are related to the structure design and processing accuracy of the machine bed. In the process of machine bed processing, the accuracy of the machine bed and the guide rail has the greatest impact on the processing accuracy of the workpiece, Therefore, when designing the machine tool bed, we should not only choose a reasonable structure, but also pay more attention to the selection of the guide rail form and the strict technical requirements necessary for the guide rail
in order to ensure that the relative position and relative position movement of parts have enough accuracy, and the whole machine tool does not vibrate when working, the following requirements are put forward for the design of the bed:
1. Good processability, easy manufacturing and assembly
2. With sufficient finish steel and high stiffness weight ratio, the deformation shall not exceed a certain value under the specified maximum load (rated load), so as to ensure that the weight of tool and workpiece accounts for about 80 ~ 85% of the total weight of the machine tool in the process of machining. Therefore, on the premise of full stiffness, the weight of support should be reced as much as possible
3. Good dynamic characteristics
it is required that when working under the specified cutting conditions, the forced vibration amplitude shall not exceed the allowable value, and the self-excited vibration shall not be generated, so as to ensure the stability of cutting
4. Small thermal deformation and internal stress require reasonable temperature distribution, and the thermal deformation of working face has little effect on machining accuracy
5. The force on the guide surface is reasonable and the wear resistance is good< The structure design is reasonable and the wear resistance is good
7. Easy chip removal. The channel of coolant and lubricating oil is smooth, and the installation position of electrical hydraulic components is reasonable
8. Easy to transport and lift
2.2 selection of materials
the bed materials mainly include cast iron and steel. Generally, the supporting parts are made of gray cast iron. Here we also design the bed material as cast iron, and the material is HT20 ~ 40, sand mold casting
the advantages of gray cast iron are: good cast iron properties, excellent wear resistance and vibration elimination, good self lubrication and oil storage structure
based on the above advantages, the bed material is HT20 ~ 40
in order to ensure the accuracy of the machine tool and stabilize the bed size, the internal stress caused by casting cooling shrinkage should be eliminated, so manual treatment should be carried out, and the surface of the guide rail should also be quenched to improve its wear resistance, small deformation and best mechanical performance, so high frequency quenching should be selected, Its hardness is hrc48 ~ 55
2.3 stress analysis
2.3.1 basic types of bed stress are as follows: (1) cutting force refers to the cutting force in X, y and Z directions. They are FX, FY and FZ
FX -- feed resistance (axial)
FY -- cutting depth (depth)
FZ -- main cutting force
(2), gravity: refers to the weight of workpiece and machine tool parts
(3) friction: the friction between the guide surfaces when the finger parts and the fixed parts move relative to each other
(4) clamping force: refers to the connecting force between connecting parts and moving parts
(5) inertia force
(6), impact and vibration
(7), thermal stress< (2) (4) (7) of the above forces belong to static force (6) belongs to dynamic force
2.3.2 basic types of bed deformation
under the action of static force and moment, the following types of bed deformation will occur:
(1) bed deformation (2) fracture