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什么時候選拉(la)桿(gan)液壓(ya)缸，什么時候選焊接(jie)液壓缸？兩者的區別是什么？

我們先(xian)來看一個液壓(ya)油缸分類表：

                    

■ 拉桿(gan)液壓缸 Tie rod cylinder 

拉桿(gan)(gan)(gan)液壓缸(gang)(gang)靠螺(luo)絲桿(gan)(gan)(gan)連接前后缸(gang)(gang)蓋，小(xiao)缸(gang)(gang)徑(jing)時為(wei)四根(gen)螺(luo)絲桿(gan)(gan)(gan)，大缸(gang)(gang)徑(jing)會加(jia)多(duo)螺(luo)絲桿(gan)(gan)(gan)的(de)數量(liang)來保(bao)證(zheng)油缸(gang)(gang)的(de)耐壓性，比(bi)如6根(gen)、16根(gen)，甚至20根(gen)。

不同的使用壓力，螺絲桿的材質不同，可能為A3、45號、合金鋼。

Tie rod style hydraulic cylinders use high strength threaded steel rods to hold the two end caps to the cylinder barrel. This method of construction is most often seen in industrial factory applications. Small bore cylinders usually have 4 tie rods, while large borecylinders may require as many as 16 or 20 tie rods in order to retain the endcaps under the tremendous forces produced.

拉桿液壓缸優勢 Advantages：

1）易(yi)于(yu)拆裝(zhuang)、維修；

2）多為標準系列，半成品(pin)或成品(pin)有(you)庫存，交(jiao)期較短。

Tie rod style cylinders can be completely disassembled for service and repair, and they are not always customizable.

■ 焊接液壓缸 Welded cylinder

焊接(jie)液(ye)壓缸的(de)后(hou)蓋焊接(jie)在缸筒(tong)上(shang)，油口焊接(jie)在缸筒(tong)上(shang)，前(qian)蓋與缸筒(tong)通常(chang)使用螺(luo)紋(wen)或螺(luo)栓固(gu)定。

Welded body cylinders have no tie rods. The barrel is welded directly to the end caps. The ports are welded to the barrel. The front rod gland is usually threaded into or bolted to the cylinder barrel. This allows the piston rod assembly and the rod seals to be removed for service.

焊接液壓缸的優勢 Advantages：

1）整體的安(an)裝尺寸(cun)小于拉桿油缸；

2）比拉桿(gan)油缸能夠(gou)承受更大的壓(ya)力(li)；

3）更容易定制，比如(ru)特殊油口、特殊安裝方式、加裝鎖(suo)緊(jin)閥等

Welded cylinders have a narrower body and often a shorter overall length enabling them to fit better into the tight confines of machinery. Welded cylinders do not suffer from failure due to tie rod stretch at high pressures and long strokes. The welded design also lends itself to customization. Special features are easily added to the cylinder body, including special ports, custom mounts, valve manifolds, and so on.

總結：

1）安裝空(kong)間夠，壓(ya)力小，行程短，選(xuan)拉桿液壓(ya)缸；

2）安(an)裝空間有限制，壓力大，選焊接(jie)液壓缸(gang)；

3）使用(yong)壓(ya)力大，工況比較(jiao)惡劣，可能需要(yao)定期更(geng)換(huan)密封件，選拉桿(gan)液(ye)壓(ya)缸(gang)；

4）油(you)口位(wei)置有特殊要求，或需(xu)加裝液壓(ya)鎖或平衡(heng)閥等(deng)，選焊接油(you)缸。