QD型通用橋式起重機

QD型通用橋式起重機依據GB/T14405-2011標準所設計、制造；適用于工礦企業(yè)的加工車間、庫房及鐵路、港口碼頭等貨場，在固定跨間物料的裝卸與搬運；但不適用于吊運熔融金屬。

本系列產品起重量般為5t、10t、16/3.2t、20/5t、32/5t、50/1Ot、75/20t、100/20t，跨度為7.5-31.5m，工作級別一般為A3一A6級。

* QD型舊系列通用雙梁橋式起重機的主耍特點：

(1)整機主要由橋架小車、大車運行機構及電控系統(tǒng)所組成。
(2)橋架由兩箱型主、端梁相聯(lián)接與兩走臺所組成。
(3)各傳動機構均采用軟齒面減速器，減速器、電機、制動器各傳動均通過聯(lián)軸器及軸相聯(lián)接。
(4)大車運行采用分別驅動，各減速器、電機、制動器均放置在走臺上。
(5)操縱形式為司機室操縱，可閉式或開式。
(6)本系列產品主要結構型式為我國從五十年代一直采用傳統(tǒng)機型，結構落后，自重、外形尺寸大，噪聲大．為行業(yè)逐步淘汰產品。
* QD型新系列通用雙梁橋式起重機的主要特點：
a)QD型新系列通用雙梁橋式起重機在借鑒國家起重機優(yōu)點的基礎上，根據國內起重機行業(yè)的實際情況和廣大用戶使用要求，吸取了QD型舊系列產品升降機構工作級別高、穩(wěn)定可靠、故障率少等優(yōu)點進行優(yōu)化改進，與QD型舊系列通用橋式起重機相比，具有結構合理、配置高、自重輕，輪壓和外形尺寸小，各機構運行噪音明顯減弱，輕便、靈活、安全可靠等優(yōu)點。
b)本機結構主要由四梁形式的橋架、大車運行機構、小車部分及電器系統(tǒng)所組成。
c)主起升機構，大、小車運行機構均采用硬齒面減速器，硬齒面減速器外形尺寸小，重量輕、強度大。傳動精度及可靠性高。
d)大、小車均采用“三合一”閉式傳動形式，大車運行分別驅動，小車運行為集中或分別驅動，減速器為漸開線花鍵套裝。
e)大、小車運行均采用變頻調速．起升機構可用電阻器調速或變頻調速。
f)操縱形式可操縱室操縱、地面按鈕把操縱或地面遙控操縱三種方式可選用。

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.