掘进质量验收工安全技术规范？

22mm=0022m 横截面积为31400110011

锚杆横截面积就是 000037994平方米

50KN=50000N

力值除以横截面积 相除结果=131599726=1315MPA

看的明白吧 济南华衡试验设备 生产拉力试验机 望采纳

数码显示抢答器设计论文编号:JD996 论文字数:11744,页数:27 有开题告和任务书摘要

二十一世纪已经进入了信息社会的崭新时代，信息社会的基础是电子技术，它是一门实践性很强的技术学科。随着电子技术的发展它已深入到生活的各个领域，抢答器也不例外。

抢答器已经被普遍使用，而且各个方面的技术已经很成熟。随着数码管的问世，科技的迅猛发展，将数码显示应用到抢答器已经是发展的必然，也是对抢答器功能的一种完善和补充。此次设计以智力和知识竞赛为背景，设计一个有能够优先显示抢答者组号并发出响声提醒，同时封锁其他组的抢答功能的抢答器。此次设计我们通过调查研究可以通过单片机或利用数模电知识的电子技术来完成。单片机虽然具有智能化、可编程等优点但又考虑到单片机造价高，编程难等问题，我们决定用分立元器件来完成。我们利用分块完成，综合连接的方法分别对抢答部分，控制部分，音响部分，直流稳压电源部分进行设计。通过调试，每块功能都没问题后，最后连接组装，综合调试，最终整个设计可以实现主持人复位清零，第一抢答信号的鉴别和锁存，显示抢答者组号，发出蜂鸣声等功能，满足设计要求。

关键字：抢答器 数码显示 抢答电路 定时电路

Abstract

The twenty-first century has already entered brand-new information society times，The information society is based on electronic technology，It is very strong one practicality technology subjectsIt already goes deep into each fields arriving at life with the development of electron technology , rush to reply an implement neither exception

Rush to reply an implement the technology by be put into use commonly, and each aspect is already already very matureWith the fact that the numerical code coming out , science and technology swiftness and violence develop,one kind applying digital display to the necessity rushing to reply the implement already is to develop , being also to rushing to reply the implement is functional improves and perfects and supplements Background designing that the contest is with intelligence and knowledge this time, the preferential display designing that one has being able to rushes to reply the person group number and effluence noise warn of , blockade at the same time rushing forming other to reply functional rushing replies an implement Come to be completed the technology this time, designing that we can pass the monolithic machine by investigation and study or making use of digital-analog electricity knowledge electron The monolithic machine thinks that cost of construction is high to monolithic machine although having merit such as intellectualized , weave Cheng , the programming is difficult to wait for problem , our to decide to be completed with standing separately coming the component We make use of partiitoning to be completed , connected synthetical method designs that respectively to rushing to reply the part , control section , audio part , direct-current stabilivolt power source part are in progress By testing , linking finally after every piece function has no problem, assembling , synthetical debugging,entire ultimate design can realize anchorperson replacement zero clearing , the first grab the be distinguished and lock exist replying a signal , display is grabbed replying the person group number , issue the buzz sound waiting for a function , satisfy design demand

Keywords： rushes to reply implement digital display rushes to reply

the circuit timing circuit

目录

第1章 绪论 1

第2章 方案选择 1

21 两种方案简介 2

22 方案选择 2

第3章 设计思路框图 3

第4章 设计过程 4

41 抢答部分 4

411 抢答按钮及编码部分 4

4111 按钮输入电路设计 4

4112 编码部分设计 4

412 锁存与译码显示部分 7

4121 译码器设计 7

4122 LED数码管简介 10

4123 74LS279触发器简介 11

42 控制部分 14

43 音响电路 15

431 555定时器简介 16

432 电路图及工作原理 17

44 稳压电源部分 17

441 三端集成稳压器简介 17

442 桥式整流，电容滤波电路 18

443 直流稳压电源 19

第5章 工作原理说明及焊接调试 20

51 工作原理说明 20

52 元器件的焊接 20

53 电路的调试 22

第6章 元器件清单 23

第7章 总结 24

参考文献 25

致谢 26

附录A电路全图 28以上回答来自: http://wwwlwtxwcom/html/42-6/6474htm