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走进矿山机械的世界，把握前沿动态资讯
成都大宏立机器股份有限公司致力于智能,高效,节能,环保的颚式,圆锥,锤式各型破碎机,制砂机,砂石破碎成套设备,砂石,制砂生产线等的研发,设计,制造和销售业务,欢迎联系! 颚式|圆锥|锤式破碎机_砂石|制砂生产线_制砂机「大宏成都大宏立机器股份有限公司致力于智能,高效,节能,环保的颚式,圆锥,锤式各型破碎机,制砂机,砂石破碎成套设备,砂石,制砂生产线等的研发,设计,制造和销售业务,欢迎联系!
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SJ圆锥式制砂机. 【应用领域】： 主要适用于矿山石料生产线的各种人工制砂、各类冶金矿山生产线的冶金粉末提取。. 【适用物料】： 岩石、矿石、矿渣、铁矿石、鹅卵石、石灰石 高效细碎机制砂机/鹅卵石制砂机设备推荐型号SJ圆锥SJ圆锥式制砂机. 【应用领域】： 主要适用于矿山石料生产线的各种人工制砂、各类冶金矿山生产线的冶金粉末提取。. 【适用物料】： 岩石、矿石、矿渣、铁矿石、鹅卵石、石灰石
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圆锥破和制沙机是砂石生产线中的主机破碎设备，常用于二、三段破碎环节，承担中细碎破碎功能。 圆锥破碎机有单缸液压圆锥破、多缸液压圆锥破、弹簧圆锥破 沙厂用的制沙机和圆锥破有什么作用？ 圆锥破和制沙机是砂石生产线中的主机破碎设备，常用于二、三段破碎环节，承担中细碎破碎功能。 圆锥破碎机有单缸液压圆锥破、多缸液压圆锥破、弹簧圆锥破
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阿里巴巴1688为您优选514条圆锥破制砂机热销货源，包括圆锥破制砂机厂家，品牌，高清大图，论坛热帖。找，逛，买，挑圆锥破制砂机，品质爆款货源批发价，上1688圆锥破制 圆锥破制砂机-圆锥破制砂机厂家、品牌、图片、热帖阿里巴巴1688为您优选514条圆锥破制砂机热销货源，包括圆锥破制砂机厂家，品牌，高清大图，论坛热帖。找，逛，买，挑圆锥破制砂机，品质爆款货源批发价，上1688圆锥破制
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优点：. 说的应该是圆锥破碎机吧，该设备破碎比大、效率高、能耗低，产品粒度均匀，适合中碎和细碎各种矿石，岩石。. 1、 破碎比大、生产效率高. ——将更高的转速与冲程结 圆锥式制砂机的优缺点 百度知道优点：. 说的应该是圆锥破碎机吧，该设备破碎比大、效率高、能耗低，产品粒度均匀，适合中碎和细碎各种矿石，岩石。. 1、 破碎比大、生产效率高. ——将更高的转速与冲程结
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制砂机也称 制沙机 ，它是引进美国巴马克公司著名的“石打石”破碎原理及技术，再结合国内制砂生产方面的实际情况，研制开发的具有国内、国际、领先水平的高效碎石设备。 本 制砂设备_百度百科制砂机也称 制沙机 ，它是引进美国巴马克公司著名的“石打石”破碎原理及技术，再结合国内制砂生产方面的实际情况，研制开发的具有国内、国际、领先水平的高效碎石设备。 本
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第六代制砂机 先进特点：. 第六代制砂机. ⑴在 第三代制砂机 的基础上增加了配重轮，这样节约了电能，增加了动能.生产效率得到了很大的提高.增加了反击板调节装置，使调节出料 制砂机_百度百科第六代制砂机 先进特点：. 第六代制砂机. ⑴在 第三代制砂机 的基础上增加了配重轮，这样节约了电能，增加了动能.生产效率得到了很大的提高.增加了反击板调节装置，使调节出料
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CN110064267A CN201811063998.4A CN201811063998A CN110064267A CN 110064267 A CN110064267 A CN 110064267A CN 201811063998 A CN201811063998 A CN 201811063998A CN 110064267 A CN110064267 A CN 110064267A Authority CN China Prior art keywords air dust flow underground water Prior art date Legal status CN110064267A 使气流快速流动实现消除粉尘的装置CN110064267A CN201811063998.4A CN201811063998A CN110064267A CN 110064267 A CN110064267 A CN 110064267A CN 201811063998 A CN201811063998 A CN 201811063998A CN 110064267 A CN110064267 A CN 110064267A Authority CN China Prior art keywords air dust flow underground water Prior art date Legal status
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CN204544282U CN201420699783.2U CN201420699783U CN204544282U CN 204544282 U CN204544282 U CN 204544282U CN 201420699783 U CN201420699783 U CN 201420699783U CN 204544282 U CN204544282 U CN 204544282U Authority CN China Prior art keywords sand dust screening device screen modular Prior art date CN204544282U 干法制砂生产线 Google PatentsCN204544282U CN201420699783.2U CN201420699783U CN204544282U CN 204544282 U CN204544282 U CN 204544282U CN 201420699783 U CN201420699783 U CN 201420699783U CN 204544282 U CN204544282 U CN 204544282U Authority CN China Prior art keywords sand dust screening device screen modular Prior art date
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CN201552021U CN2009202014840U CN200920201484U CN201552021U CN 201552021 U CN201552021 U CN 201552021U CN 2009202014840 U CN2009202014840 U CN 2009202014840U CN 200920201484 U CN200920201484 U CN 200920201484U CN 201552021 U CN201552021 U CN 201552021U Authority CN China Prior art keywords CN201552021U 圆锥式制砂机 Google PatentsCN201552021U CN2009202014840U CN200920201484U CN201552021U CN 201552021 U CN201552021 U CN 201552021U CN 2009202014840 U CN2009202014840 U CN 2009202014840U CN 200920201484 U CN200920201484 U CN 200920201484U CN 201552021 U CN201552021 U CN 201552021U Authority CN China Prior art keywords
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CN109157938A CN201811226183.3A CN201811226183A CN109157938A CN 109157938 A CN109157938 A CN 109157938A CN 201811226183 A CN201811226183 A CN 201811226183A CN 109157938 A CN109157938 A CN 109157938A Authority CN China Prior art keywords air dust underground air duct exhaust pipe Prior art date CN109157938A Google PatentsCN109157938A CN201811226183.3A CN201811226183A CN109157938A CN 109157938 A CN109157938 A CN 109157938A CN 201811226183 A CN201811226183 A CN 201811226183A CN 109157938 A CN109157938 A CN 109157938A Authority CN China Prior art keywords air dust underground air duct exhaust pipe Prior art date
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Группа изобретений относится к узлу нижнего корпуса дробилки и дробилке с таким узлом, который может быть использован в гирационных конусных дробилках. Узел нижнего корпуса содержит наружную стенку, внутреннюю RU2653551C2 Узел нижнего корпуса Google PatentsГруппа изобретений относится к узлу нижнего корпуса дробилки и дробилке с таким узлом, который может быть использован в гирационных конусных дробилках. Узел нижнего корпуса содержит наружную стенку, внутреннюю
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CN110090509A CN201910518790.5A CN201910518790A CN110090509A CN 110090509 A CN110090509 A CN 110090509A CN 201910518790 A CN201910518790 A CN 201910518790A CN 110090509 A CN110090509 A CN 110090509A Authority CN China Prior art keywords dust suction water underground air duct air Prior art date CN110090509A 利用压强差进行吸尘的装置 Google PatentsCN110090509A CN201910518790.5A CN201910518790A CN110090509A CN 110090509 A CN110090509 A CN 110090509A CN 201910518790 A CN201910518790 A CN 201910518790A CN 110090509 A CN110090509 A CN 110090509A Authority CN China Prior art keywords dust suction water underground air duct air Prior art date
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CN109939521A CN201910210189.XA CN201910210189A CN109939521A CN 109939521 A CN109939521 A CN 109939521A CN 201910210189 A CN201910210189 A CN 201910210189A CN 109939521 A CN109939521 A CN 109939521A Authority CN China Prior art keywords dust water underground air duct extraction unit Prior art date 2018-08 CN109939521A Google PatentsCN109939521A CN201910210189.XA CN201910210189A CN109939521A CN 109939521 A CN109939521 A CN 109939521A CN 201910210189 A CN201910210189 A CN 201910210189A CN 109939521 A CN109939521 A CN 109939521A Authority CN China Prior art keywords dust water underground air duct extraction unit Prior art date 2018-08
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CN104550000B CN201410666808.3A CN201410666808A CN104550000B CN 104550000 B CN104550000 B CN 104550000B CN 201410666808 A CN201410666808 A CN 201410666808A CN 104550000 B CN104550000 B CN 104550000B Authority CN China Prior art keywords vibrating screen sand linear vibrating screening device screen Prior CN104550000B Google PatentsCN104550000B CN201410666808.3A CN201410666808A CN104550000B CN 104550000 B CN104550000 B CN 104550000B CN 201410666808 A CN201410666808 A CN 201410666808A CN 104550000 B CN104550000 B CN 104550000B Authority CN China Prior art keywords vibrating screen sand linear vibrating screening device screen Prior
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CN102069066B CN 201010563676 CN201010563676A CN102069066B CN 102069066 B CN102069066 B CN 102069066B CN 201010563676 CN201010563676 CN 201010563676 CN 201010563676 A CN201010563676 A CN 201010563676A CN 102069066 B CN102069066 B CN 102069066B Authority CN China Prior art keywords sand screen CN102069066B Google PatentsCN102069066B CN 201010563676 CN201010563676A CN102069066B CN 102069066 B CN102069066 B CN 102069066B CN 201010563676 CN201010563676 CN 201010563676 CN 201010563676 A CN201010563676 A CN 201010563676A CN 102069066 B CN102069066 B CN 102069066B Authority CN China Prior art keywords sand screen
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EP2859949B1 EP13188207.8A EP13188207A EP2859949B1 EP 2859949 B1 EP2859949 B1 EP 2859949B1 EP 13188207 A EP13188207 A EP 13188207A EP 2859949 B1 EP2859949 B1 EP 2859949B1 Authority EP European Patent Office Prior art keywords hub wall arm facing surface seat Prior art date Legal status (The legal status is EP2859949B1 Gyratory crusher bottom shell assembly and arm EP2859949B1 EP13188207.8A EP13188207A EP2859949B1 EP 2859949 B1 EP2859949 B1 EP 2859949B1 EP 13188207 A EP13188207 A EP 13188207A EP 2859949 B1 EP2859949 B1 EP 2859949B1 Authority EP European Patent Office Prior art keywords hub wall arm facing surface seat Prior art date Legal status (The legal status is
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CN205572715U CN201620391159.5U CN201620391159U CN205572715U CN 205572715 U CN205572715 U CN 205572715U CN 201620391159 U CN201620391159 U CN 201620391159U CN 205572715 U CN205572715 U CN 205572715U Authority CN China Prior art keywords stirring shaft gear stirring roller shaft Prior art date Legal CN205572715U 一种隧道施工用五轴搅拌装置 Google PatentsCN205572715U CN201620391159.5U CN201620391159U CN205572715U CN 205572715 U CN205572715 U CN 205572715U CN 201620391159 U CN201620391159 U CN 201620391159U CN 205572715 U CN205572715 U CN 205572715U Authority CN China Prior art keywords stirring shaft gear stirring roller shaft Prior art date Legal
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CN102091692B CN 201010563675 CN201010563675A CN102091692B CN 102091692 B CN102091692 B CN 102091692B CN 201010563675 CN201010563675 CN 201010563675 CN 201010563675 A CN201010563675 A CN 201010563675A CN 102091692 B CN102091692 B CN 102091692B Authority CN China Prior art keywords sand screen CN102091692B Google PatentsCN102091692B CN 201010563675 CN201010563675A CN102091692B CN 102091692 B CN102091692 B CN 102091692B CN 201010563675 CN201010563675 CN 201010563675 CN 201010563675 A CN201010563675 A CN 201010563675A CN 102091692 B CN102091692 B CN 102091692B Authority CN China Prior art keywords sand screen
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CN102069066A CN 201010563676 CN201010563676A CN102069066A CN 102069066 A CN102069066 A CN 102069066A CN 201010563676 CN201010563676 CN 201010563676 CN 201010563676 A CN201010563676 A CN 201010563676A CN 102069066 A CN102069066 A CN 102069066A Authority CN China Prior art keywords sand screen CN102069066A Google PatentsCN102069066A CN 201010563676 CN201010563676A CN102069066A CN 102069066 A CN102069066 A CN 102069066A CN 201010563676 CN201010563676 CN 201010563676 CN 201010563676 A CN201010563676 A CN 201010563676A CN 102069066 A CN102069066 A CN 102069066A Authority CN China Prior art keywords sand screen
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CN109351455A CN201810994845.5A CN201810994845A CN109351455A CN 109351455 A CN109351455 A CN 109351455A CN 201810994845 A CN201810994845 A CN 201810994845A CN 109351455 A CN109351455 A CN 109351455A Authority CN China Prior art keywords grate lifting strip end cap material side edge Prior art date CN109351455A 一种用于大型矿用磨机的格子板 Google PatentsCN109351455A CN201810994845.5A CN201810994845A CN109351455A CN 109351455 A CN109351455 A CN 109351455A CN 201810994845 A CN201810994845 A CN 201810994845A CN 109351455 A CN109351455 A CN 109351455A Authority CN China Prior art keywords grate lifting strip end cap material side edge Prior art date
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CN113020013A CN202110267075.6A CN202110267075A CN113020013A CN 113020013 A CN113020013 A CN 113020013A CN 202110267075 A CN202110267075 A CN 202110267075A CN 113020013 A CN113020013 A CN 113020013A Authority CN China Prior art keywords cylinder body cavity pressure inner cylinder outer cylinder Prior art CN113020013A 一种盾构机刀盘泥饼激振清理装置 GoogleCN113020013A CN202110267075.6A CN202110267075A CN113020013A CN 113020013 A CN113020013 A CN 113020013A CN 202110267075 A CN202110267075 A CN 202110267075A CN 113020013 A CN113020013 A CN 113020013A Authority CN China Prior art keywords cylinder body cavity pressure inner cylinder outer cylinder Prior art
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CN206543612U CN201720056711.XU CN201720056711U CN206543612U CN 206543612 U CN206543612 U CN 206543612U CN 201720056711 U CN201720056711 U CN 201720056711U CN 206543612 U CN206543612 U CN 206543612U Authority CN China Prior art keywords roller fixedly connected crushing roller live hammer mill Prior art date CN206543612U Google PatentsCN206543612U CN201720056711.XU CN201720056711U CN206543612U CN 206543612 U CN206543612 U CN 206543612U CN 201720056711 U CN201720056711 U CN 201720056711U CN 206543612 U CN206543612 U CN 206543612U Authority CN China Prior art keywords roller fixedly connected crushing roller live hammer mill Prior art date
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CA2925024A1 CA2925024A CA2925024A CA2925024A1 CA 2925024 A1 CA2925024 A1 CA 2925024A1 CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A1 CA2925024 A1 CA 2925024A1 Authority CA Canada Prior art keywords hub arm seat wall liner Prior art date Legal status (The legal CA2925024A1 Gyratory crusher bottom shell assembly and arm CA2925024A1 CA2925024A CA2925024A CA2925024A1 CA 2925024 A1 CA2925024 A1 CA 2925024A1 CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A1 CA2925024 A1 CA 2925024A1 Authority CA Canada Prior art keywords hub arm seat wall liner Prior art date Legal status (The legal
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L'invention concerne une machine de fabrication de sable conique résistant aux intempéries. Lorsqu'un manchon fileté de réglage (2) et un logement supérieur (1) sont vissés en sens horaire, un arbre principal (3) dans la machine de fabrication de sable conique tourne dans une direction antihoraire; inversement, lorsque le manchon fileté de réglage et le WO2015027579A1 Machine de fabrication de sable Google L'invention concerne une machine de fabrication de sable conique résistant aux intempéries. Lorsqu'un manchon fileté de réglage (2) et un logement supérieur (1) sont vissés en sens horaire, un arbre principal (3) dans la machine de fabrication de sable conique tourne dans une direction antihoraire; inversement, lorsque le manchon fileté de réglage et le
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CN104549618A CN201410535043.XA CN201410535043A CN104549618A CN 104549618 A CN104549618 A CN 104549618A CN 201410535043 A CN201410535043 A CN 201410535043A CN 104549618 A CN104549618 A CN 104549618A Authority CN China Prior art keywords arm hub face liner wall Prior art date Legal status (The CN104549618A 回转破碎机底壳臂和臂衬垫 Google PatentsCN104549618A CN201410535043.XA CN201410535043A CN104549618A CN 104549618 A CN104549618 A CN 104549618A CN 201410535043 A CN201410535043 A CN 201410535043A CN 104549618 A CN104549618 A CN 104549618A Authority CN China Prior art keywords arm hub face liner wall Prior art date Legal status (The
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CN106732967A CN201710034503.4A CN201710034503A CN106732967A CN 106732967 A CN106732967 A CN 106732967A CN 201710034503 A CN201710034503 A CN 201710034503A CN 106732967 A CN106732967 A CN 106732967A Authority CN China Prior art keywords roller fixedly connected crushing roller live hammer mill Prior art date CN106732967A Google PatentsCN106732967A CN201710034503.4A CN201710034503A CN106732967A CN 106732967 A CN106732967 A CN 106732967A CN 201710034503 A CN201710034503 A CN 201710034503A CN 106732967 A CN106732967 A CN 106732967A Authority CN China Prior art keywords roller fixedly connected crushing roller live hammer mill Prior art date
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CN113578440A CN202110702476.XA CN202110702476A CN113578440A CN 113578440 A CN113578440 A CN 113578440A CN 202110702476 A CN202110702476 A CN 202110702476A CN 113578440 A CN113578440 A CN 113578440A Authority CN China Prior art keywords raw material glass production material crushing movable roller rod CN113578440A 一种应用于玻璃生产的原料破碎装置CN113578440A CN202110702476.XA CN202110702476A CN113578440A CN 113578440 A CN113578440 A CN 113578440A CN 202110702476 A CN202110702476 A CN 202110702476A CN 113578440 A CN113578440 A CN 113578440A Authority CN China Prior art keywords raw material glass production material crushing movable roller rod
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L'invention concerne une coque inférieure et un ensemble coque inférieure de concasseur giratoire dans lesquels des revêtements de protection sont montés sur et autour de bras de support (106) respectifs qui s'étendent radialement entre la paroi de coque inférieure et un moyeu central (107). Les bras de support (106) comprennent une région de siège ou de CA2925024A1 Ensemble coque inferieure de concasseur L'invention concerne une coque inférieure et un ensemble coque inférieure de concasseur giratoire dans lesquels des revêtements de protection sont montés sur et autour de bras de support (106) respectifs qui s'étendent radialement entre la paroi de coque inférieure et un moyeu central (107). Les bras de support (106) comprennent une région de siège ou de
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WO2015051989A1 PCT/EP2014/070109 EP2014070109W WO2015051989A1 WO 2015051989 A1 WO2015051989 A1 WO 2015051989A1 EP 2014070109 W EP2014070109 W EP 2014070109W WO 2015051989 A1 WO2015051989 A1 WO 2015051989A1 Authority WO WIPO (PCT) Prior art keywords hub arm seat wall liner Prior art date WO2015051989A1 Gyratory crusher bottom shell assembly and WO2015051989A1 PCT/EP2014/070109 EP2014070109W WO2015051989A1 WO 2015051989 A1 WO2015051989 A1 WO 2015051989A1 EP 2014070109 W EP2014070109 W EP 2014070109W WO 2015051989 A1 WO2015051989 A1 WO 2015051989A1 Authority WO WIPO (PCT) Prior art keywords hub arm seat wall liner Prior art date
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CA2925024A1 CA2925024A CA2925024A CA2925024A1 CA 2925024 A1 CA2925024 A1 CA 2925024A1 CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A1 CA2925024 A1 CA 2925024A1 Authority CA Canada Prior art keywords hub arm seat wall liner Prior art date Legal status (The legal CA2925024A1 Gyratory crusher bottom shell assembly and arm CA2925024A1 CA2925024A CA2925024A CA2925024A1 CA 2925024 A1 CA2925024 A1 CA 2925024A1 CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A CA2925024 A CA 2925024A CA 2925024 A1 CA2925024 A1 CA 2925024A1 Authority CA Canada Prior art keywords hub arm seat wall liner Prior art date Legal status (The legal
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EP2859949A1 EP20130188207 EP13188207A EP2859949A1 EP 2859949 A1 EP2859949 A1 EP 2859949A1 EP 20130188207 EP20130188207 EP 20130188207 EP 13188207 A EP13188207 A EP 13188207A EP 2859949 A1 EP2859949 A1 EP 2859949A1 Authority EP European Patent Office Prior art keywords hub arm seat wall liner Prior art date 2013-10 EP2859949A1 Coque inférieure de concasseur giratoire et EP2859949A1 EP20130188207 EP13188207A EP2859949A1 EP 2859949 A1 EP2859949 A1 EP 2859949A1 EP 20130188207 EP20130188207 EP 20130188207 EP 13188207 A EP13188207 A EP 13188207A EP 2859949 A1 EP2859949 A1 EP 2859949A1 Authority EP European Patent Office Prior art keywords hub arm seat wall liner Prior art date 2013-10
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RU2653551C2 RU2016117996A RU2016117996A RU2653551C2 RU 2653551 C2 RU2653551 C2 RU 2653551C2 RU 2016117996 A RU2016117996 A RU 2016117996A RU 2016117996 A RU2016117996 A RU 2016117996A RU 2653551 C2 RU2653551 C2 RU 2653551C2 Authority RU Russia Prior art keywords hub wall radially socket lining Prior RU2653551C2 Узел нижнего корпуса Google PatentsRU2653551C2 RU2016117996A RU2016117996A RU2653551C2 RU 2653551 C2 RU2653551 C2 RU 2653551C2 RU 2016117996 A RU2016117996 A RU 2016117996A RU 2016117996 A RU2016117996 A RU 2016117996A RU 2653551 C2 RU2653551 C2 RU 2653551C2 Authority RU Russia Prior art keywords hub wall radially socket lining Prior
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RU2653551C2 RU2016117996A RU2016117996A RU2653551C2 RU 2653551 C2 RU2653551 C2 RU 2653551C2 RU 2016117996 A RU2016117996 A RU 2016117996A RU 2016117996 A RU2016117996 A RU 2016117996A RU 2653551 C2 RU2653551 C2 RU 2653551C2 Authority RU Russia Prior art keywords hub wall radially socket lining Prior RU2653551C2 Узел нижнего корпуса Google PatentsRU2653551C2 RU2016117996A RU2016117996A RU2653551C2 RU 2653551 C2 RU2653551 C2 RU 2653551C2 RU 2016117996 A RU2016117996 A RU 2016117996A RU 2016117996 A RU2016117996 A RU 2016117996A RU 2653551 C2 RU2653551 C2 RU 2653551C2 Authority RU Russia Prior art keywords hub wall radially socket lining Prior
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B — PERFORMING OPERATIONS; TRANSPORTING; B02 — CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING; B02C — CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN; B02C2/00 — Crushing or disintegrating by gyratory or cone crushers; CL2016000814A1 Montaje de carcasa inferior de trituradora B — PERFORMING OPERATIONS; TRANSPORTING; B02 — CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING; B02C — CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN; B02C2/00 — Crushing or disintegrating by gyratory or cone crushers;
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US20160236198A1 US15/028,126 US201415028126A US2016236198A1 US 20160236198 A1 US20160236198 A1 US 20160236198A1 US 201415028126 A US201415028126 A US 201415028126A US 2016236198 A1 US2016236198 A1 US 2016236198A1 Authority US United States Prior art keywords hub arm seat wall liner Prior art date Legal US20160236198A1 Gyratory crusher bottom shell assembly and US20160236198A1 US15/028,126 US201415028126A US2016236198A1 US 20160236198 A1 US20160236198 A1 US 20160236198A1 US 201415028126 A US201415028126 A US 201415028126A US 2016236198 A1 US2016236198 A1 US 2016236198A1 Authority US United States Prior art keywords hub arm seat wall liner Prior art date Legal
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