拧扣机根(gen)据(ju)夹紧原理分三(san)种类型；

1.凸(tu)轮(lun)(lun)(lun)行(xing)星齿(chi)轮(lun)(lun)(lun)夹紧(jin)方式：液压马达通过齿(chi)轮(lun)(lun)(lun)减速带(dai)动大齿(chi)轮(lun)(lun)(lun)，大齿(chi)轮(lun)(lun)(lun)内(nei)齿(chi)带(dai)动行(xing)星齿(chi)轮(lun)(lun)(lun)，带(dai)动同(tong)轴行(xing)星爪翻转，从而夹紧(jin)管(guan)(guan)件(jian)。优(you)点：结(jie)构(gou)简单，管(guan)(guan)件(jian)更换规格不需(xu)要(yao)更换工装(zhuang)。缺点：夹紧(jin)力并(bing)非(fei)垂直管(guan)(guan)件(jian)，有一个角度，行(xing)星爪必(bi)须比管(guan)(guan)件(jian)硬度大，咬入管(guan)(guan)件(jian)内(nei)才能夹紧(jin)，与管(guan)(guan)件(jian)是线(xian)性接触，接触点最多3-5个，所以夹痕比较大，扭矩大并(bing)且管(guan)(guan)件(jian)厚(hou)度薄时(shi)容易导致管(guan)(guan)件(jian)变形；适(shi)用范围有限，一般应用在小尺寸7寸以下(xia)；最常用型号YNJX160、YNJX210等。

2.   滚子爬坡(po)(po)夹(jia)(jia)(jia)(jia)(jia)紧(jin)方(fang)式：液压马达通过齿(chi)(chi)轮(lun)(lun)减速带(dai)动大齿(chi)(chi)轮(lun)(lun)，大齿(chi)(chi)轮(lun)(lun)内镶3-4块(kuai)坡(po)(po)板(ban)，有(you)3-4块(kuai)鄂(e)板(ban)安装(zhuang)(zhuang)(zhuang)于颚(e)(e)板(ban)架(jia)(jia)中，3-4块(kuai)鄂(e)板(ban)闭(bi)口(kou)均(jun)布在(zai)坡(po)(po)板(ban)内侧，并由鄂(e)板(ban)架(jia)(jia)固定(ding)(ding)，装(zhuang)(zhuang)(zhuang)于壳体上(shang)(shang)的(de)(de)(de)刹车带(dai)给(ji)颚(e)(e)板(ban)架(jia)(jia)一(yi)(yi)定(ding)(ding)的(de)(de)(de)摩擦阻力(li)，当(dang)(dang)大齿(chi)(chi)轮(lun)(lun)旋转(zhuan)时，颚(e)(e)板(ban)上(shang)(shang)的(de)(de)(de)滚子就(jiu)沿坡(po)(po)板(ban)的(de)(de)(de)曲面(mian)(mian)爬坡(po)(po)，从(cong)而使颚(e)(e)板(ban)沿颚(e)(e)板(ban)架(jia)(jia)上(shang)(shang)的(de)(de)(de)滑道滑动，并抱紧(jin)管(guan)(guan)(guan)(guan)件(jian)(jian)。当(dang)(dang)扭矩大于刹车带(dai)阻力(li)时，颚(e)(e)板(ban)架(jia)(jia)、颚(e)(e)板(ban)、管(guan)(guan)(guan)(guan)件(jian)(jian)就(jiu)随大齿(chi)(chi)轮(lun)(lun)一(yi)(yi)起转(zhuan)动。这就(jiu)实现(xian)了拧(ning)(ning)扣(kou)过程。优点：夹(jia)(jia)(jia)(jia)(jia)紧(jin)力(li)垂直(zhi)管(guan)(guan)(guan)(guan)件(jian)(jian)，接触面(mian)(mian)可(ke)以(yi)做(zuo)到(dao)6-12点；夹(jia)(jia)(jia)(jia)(jia)痕(hen)(hen)比较(jiao)小，缺点：管(guan)(guan)(guan)(guan)件(jian)(jian)更换规(gui)格(ge)需要更换相(xiang)应工装(zhuang)(zhuang)(zhuang)，每种(zhong)规(gui)格(ge)拧(ning)(ning)扣(kou)机夹(jia)(jia)(jia)(jia)(jia)紧(jin)范围有(you)限，不能(neng)做(zuo)到(dao)全尺寸。这种(zhong)结(jie)构(gou)非(fei)常适合套管(guan)(guan)(guan)(guan)生产，唯一(yi)(yi)不足是不能(neng)实现(xian)无夹(jia)(jia)(jia)(jia)(jia)痕(hen)(hen)；当(dang)(dang)他采(cai)用(yong)(yong)弧面(mian)(mian)钳(qian)牙时，由于夹(jia)(jia)(jia)(jia)(jia)紧(jin)力(li)和(he)拧(ning)(ning)紧(jin)扭矩正(zheng)相(xiang)关，扭矩越大夹(jia)(jia)(jia)(jia)(jia)紧(jin)力(li)越大，初始扭矩小，夹(jia)(jia)(jia)(jia)(jia)紧(jin)力(li)也小，采(cai)用(yong)(yong)弧面(mian)(mian)钳(qian)牙摩擦力(li)小，初始夹(jia)(jia)(jia)(jia)(jia)紧(jin)力(li)也小,从(cong)而打滑,市面(mian)(mian)上(shang)(shang)采(cai)用(yong)(yong)这种(zhong)结(jie)构(gou)所谓无夹(jia)(jia)(jia)(jia)(jia)痕(hen)(hen)拧(ning)(ning)扣(kou)机都(dou)不能(neng)做(zuo)到(dao)无夹(jia)(jia)(jia)(jia)(jia)痕(hen)(hen)，只能(neng)在(zai)钳(qian)牙外形上(shang)(shang)做(zuo)文章(zhang)，做(zuo)到(dao)夹(jia)(jia)(jia)(jia)(jia)痕(hen)(hen)比较(jiao)小而已；最常用(yong)(yong)型号YNJG180/20、YNJG230/30、YNJG400/68、YNJG570/68等.

3.   采(cai)用(yong)三-六个(ge)油缸同步夹紧并连续(xu)旋转(zhuan)进行(xing)拧(ning)扣(kou)；每个(ge)油缸驱(qu)动一个(ge)钳(qian)口，三-六个(ge)油缸同步夹持；优(you)点：当采(cai)用(yong)条状钳(qian)牙，可以做到全尺寸夹紧；范围大(da)，不需(xu)要换钳(qian)牙工装，夹紧力可调，适(shi)(shi)应所有(you)管(guan)(guan)(guan)材；夹痕适(shi)(shi)中；当采(cai)用(yong)喷涂技术(shu)无痕钳(qian)牙，可以做到无痕夹紧；对(dui)一些特殊(shu)材质(zhi)管(guan)(guan)(guan)体，如(ru)CRA含珞防腐管(guan)(guan)(guan)、钛(tai)管(guan)(guan)(guan)、不锈钢管(guan)(guan)(guan)等(deng)正(zheng)合适(shi)(shi)。缺(que)点：结构复杂，造价高(gao)。最常用(yong)型(xing)号：YNJQ300、YNJQ400、YNJQ470、YNJQ590等(deng)。

4.     混合型；为了特定需要，主(zhu)(zhu)钳和(he)背钳分(fen)别采(cai)用(yong)(yong)不同原理夹紧(jin)机构(gou)满足特定需要。主(zhu)(zhu)要有主(zhu)(zhu)钳采(cai)用(yong)(yong)行星爪夹紧(jin)，背钳采(cai)用(yong)(yong)油缸夹紧(jin)。型号(hao)(hao)YNJX400/68Q; 主(zhu)(zhu)钳采(cai)用(yong)(yong)滚子爬(pa)坡夹紧(jin)，背钳采(cai)用(yong)(yong)油缸夹紧(jin)。型号(hao)(hao)YNJG400/68Q.