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在大批大量生產中，為提高生產率、降低工人勞動強度，大多數沙子烘干機夾具都采用機動夾緊裝置。驅動方式有氣動、液動、氣液聯合驅動，電(磁)驅動，真空吸附等多種形式。
1.氣動夾緊裝置
氣動吏緊裝置以壓縮空氣作為動力源推動夾緊機構夾緊工件。進入氣缸的壓縮空氣的壓力為0.4—0,6MPa。常用的氣缸結構有活塞式和薄膜式兩種。

話(hua)塞(sai)(sai)(sai)式(shi)(shi)(shi)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)按照氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)裝夾(jia)(jia)(jia)方(fang)式(shi)(shi)(shi)分(fen)類有固(gu)(gu)定(ding)式(shi)(shi)(shi)、擺(bai)動(dong)式(shi)(shi)(shi)和(he)回轉式(shi)(shi)(shi)三種(zhong)，按工作方(fang)式(shi)(shi)(shi)分(fen)受百單向作用(yong)(yong)(yong)(yong)(yong)和(he)雙向作用(yong)(yong)(yong)(yong)(yong)兩(liang)種(zhong)，沙子烘干機中應用(yong)(yong)(yong)(yong)(yong)最廣泛的(de)(de)(de)是(shi)雙作用(yong)(yong)(yong)(yong)(yong)固(gu)(gu)定(ding)式(shi)(shi)(shi)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)。中氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)的(de)(de)(de)前蓋1和(he)后(hou)蓋6用(yong)(yong)(yong)(yong)(yong)螺釘與(yu)(yu)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)體(ti)2相(xiang)聯，活(huo)(huo)塞(sai)(sai)(sai)4在(zai)壓縮空氣(qi)(qi)(qi)(qi)(qi)推動(dong)下作往(wang)復運動(dong)，活(huo)(huo)塞(sai)(sai)(sai)桿3與(yu)(yu)中間傳力裝置相(xiang)聯或(huo)直接與(yu)(yu)夾(jia)(jia)(jia)緊(jin)元件相(xiang)聯，為防止沙子烘干機氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)漏(lou)氣(qi)(qi)(qi)(qi)(qi)在(zai)活(huo)(huo)塞(sai)(sai)(sai)與(yu)(yu)缸(gang)(gang)壁間設有密封圈5。在(zai)雙作用(yong)(yong)(yong)(yong)(yong)擺(bai)動(dong)式(shi)(shi)(shi)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)的(de)(de)(de)應用(yong)(yong)(yong)(yong)(yong)實例。是(shi)車(che)床(chuang)上(shang)(shang)使用(yong)(yong)(yong)(yong)(yong)的(de)(de)(de)回轉式(shi)(shi)(shi)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)實例，夾(jia)(jia)(jia)具體(ti)8通過(guo)過(guo)渡(du)(du)盤(pan)(pan)7裝夾(jia)(jia)(jia)在(zai)車(che)床(chuang)主(zhu)軸6的(de)(de)(de)前端(duan)，氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)3通過(guo)過(guo)渡(du)(du)盤(pan)(pan)4固(gu)(gu)定(ding)在(zai)車(che)床(chuang)主(zhu)軸的(de)(de)(de)術端(duan);活(huo)(huo)塞(sai)(sai)(sai)2拽拉(la)桿5推動(dong)夾(jia)(jia)(jia)緊(jin)裝置將下件夾(jia)(jia)(jia)緊(jin);氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)3連同(tong)活(huo)(huo)塞(sai)(sai)(sai)2、活(huo)(huo)塞(sai)(sai)(sai)桿5與(yu)(yu)夾(jia)(jia)(jia)具體(ti)8將一同(tong)隨(sui)車(che)床(chuang)主(zhu)軸回轉，而導氣(qi)(qi)(qi)(qi)(qi)接頭1則是(shi)固(gu)(gu)定(ding)不動(dong)的(de)(de)(de)。是(shi)導氣(qi)(qi)(qi)(qi)(qi)接頭的(de)(de)(de)結構圖，配(pei)氣(qi)(qi)(qi)(qi)(qi)軸用(yong)(yong)(yong)(yong)(yong)螺母緊(jin)固(gu)(gu)在(zai)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)的(de)(de)(de)后(hou)蓋上(shang)(shang)并與(yu)(yu)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)一同(tong)隨(sui)車(che)床(chuang)主(zhu)軸回轉閥體(ti)固(gu)(gu)定(ding)不動(dong)，接頭3、4分(fen)別(bie)與(yu)(yu)氣(qi)(qi)(qi)(qi)(qi)缸(gang)(gang)左右兩(liang)腔相(xiang)連。

為單向作用的薄膜式氣缸結構，薄膜2代替活塞將氣室分為左右兩部分。當壓縮空氣由導氣接頭l輸入左腔后，沙子烘干機推動薄膜2和推桿5右移夾緊工件。當左腔由導氣接頭經分配閥放氣時，彈簧6使推桿左移復位，松開工件。與活塞式氣缸相比，薄膜式氣缸具有密封性好、結構簡單、壽命較長的優點;缺點是工作行程較短，夾緊力隨行程變化而變化。
2.液壓夾緊裝置
液壓夾緊裝置的結構和工作原理基本與氣動夾緊裝置相同，所不同的是它所用的工作介質是壓力油，工作壓力可達5~ 6.5MPa。與氣壓夾緊裝置相比，液壓沙子烘干機夾緊具有以下優點：①傳動力大，夾具結構相對比較小;②油液不可壓縮，夾緊可靠，工作平穩;③噪聲小。它的不足之處是須設置專門的液壓系統，應用范廚受限制。
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