QD型通用桥式起重机

QD型通用桥式起重机依据GB/T14405-2011标准所设计、制造；适用于工矿企业的加工车间、库房及铁路、港口码头等货场，在固定跨间物料的装卸与搬运；但不适用于吊运熔融金属。

本系列产品起重量般为5t、10t、16/3.2t、20/5t、32/5t、50/1Ot、75/20t、100/20t，跨度为7.5-31.5m，工作级别一般为A3一A6级。

* QD型旧系列通用双梁桥式起重机的主耍特点：

(1)整机主要由桥架小车、大车运行机构及电控系统所组成。
(2)桥架由两箱型主、端梁相联接与两走台所组成。
(3)各传动机构均采用软齿面减速器，减速器、电机、制动器各传动均通过联轴器及轴相联接。
(4)大车运行采用分别驱动，各减速器、电机、制动器均放置在走台上。
(5)操纵形式为司机室操纵，可闭式或开式。
(6)本系列产品主要结构型式为我国从五十年代一直采用传统机型，结构落后，自重、外形尺寸大，噪声大．为行业逐步淘汰产品。
* QD型新系列通用双梁桥式起重机的主要特点：
a)QD型新系列通用双梁桥式起重机在借鉴国家起重机优点的基础上，根据国内起重机行业的实际情况和广大用户使用要求，吸取了QD型旧系列产品升降机构工作级别高、稳定可靠、故障率少等优点进行优化改进，与QD型旧系列通用桥式起重机相比，具有结构合理、配置高、自重轻，轮压和外形尺寸小，各机构运行噪音明显减弱，轻便、灵活、安全可靠等优点。
b)本机结构主要由四梁形式的桥架、大车运行机构、小车部分及电器系统所组成。
c)主起升机构，大、小车运行机构均采用硬齿面减速器，硬齿面减速器外形尺寸小，重量轻、强度大。传动精度及可靠性高。
d)大、小车均采用“三合一"闭式传动形式，大车运行分别驱动，小车运行为集中或分别驱动，减速器为渐开线花键套装。
e)大、小车运行均采用变频调速．起升机构可用电阻器调速或变频调速。
f)操纵形式可操纵室操纵、地面按钮把操纵或地面遥控操纵三种方式可选用。

QD overhead crane，based on GB/T14405-2011 standard，is almost applicable to all kinds of environments such as processing workshops，mines ,warehouses railway and port.
There is a wide range of span to choose and special span can be designed in accordance with customers’demand.

Performance data
Range of lifting load 5t, 10t, 16/3.2t,20/5t,32/5t,50/10t. 75/20t, 100/20t
Range of span 7.5～31.5m
Allowed crane classification group A3-A6

*** Main features Of old QD overhead crane
(1)The crane is mainly composed of bridge，trolley，travelling mechanism and electronic system.
(2)Its bridge is composed of two main box-girders and two end car riages，which are connected with each other，as well as two platforms along with main girders.
(3)All the transmission adopts middle-hardened reducers,Reducers, motors and brakes are connected with each other by means of couplings.
(4)Travelling mechanism adopts respective drive. Reducers，motors and brakes are mounted on platforms.
(5)There are two kind of manipulation，open or closed cab’s control.
(6)This crane, one of the most traditional cranes，gradually phases out of the scene for its backward structure，heavy weight, large size and loud noise

*** Main features of new QD overhead crane
a)All through old QD crane has many advantages such as high classification group，low rate of failure and high stability and reliability，the above-mentioned drawbacks make it become more and more unfavou rable in modern industry.
Combining its main advantages and advanced technology developed in recent years, new QD overhead crane is designed. Compared with old QD crane，it has compact structure,light weight, low noise ,flexible assembly，reliable control system，etc.
b)The crane is mainly composed of four-beam bridge, travelling mechanism trolley and electrical system.
c)Hardened reducers are widely mounted on Main hoisting mechanism，travelling mechanism and trolley because of their excellent features of small dimension，light weight，high strength, high accuracy and reliability of transmission.
d)Both travelling mechanism and traversing mechanism adopt "three in one" closed drive. The former adopts respective drive and the latter adopts centralized or respective drive.
e)Both travelling mechanism and traversing mechanism adopt variable frequency for speed adjustment. Hoisting mechanism adopts resistors or variable frequency for speed adjustment.
f)There are three kinds of manipulation: cab’s control,ground wired button control and remote control.