摘要：【中文】本发明公开了一种二甲双胍缓释tHA/PCL引导组织再生膜及其制备方法，二甲双胍缓释tHA/PCL引导组织再生膜包括tHA/PCL复合纳米纤维膜和含有二甲双胍的CMC/PLL涂层，其制备方法：1)制备tHA；2)通过静电纺丝技术制备出tHA/PCL复合纳米纤维膜；3)利用静电吸附层层自组装技术，在tHA/PCL复合纳米纤维膜的表面制备含有二甲双胍的CMC/PLL涂层；4)采用生物交联剂京尼平对CMC/PLL涂层进行化学交联。本发明利用二甲双胍对纳米颗粒tHA的细胞毒性作用的调控作用，改善了tHA/PCL复合纤维材料的生物相容性和成骨活性，能促进牙周组织的修复再生。 【EN】The invention discloses a metformin sustained-release tHA/PCL guided tissue regeneration film and a preparation method thereof, wherein the metformin sustained-release tHA/PCL guided tissue regeneration film comprises a tHA/PCL composite nanofiber film and a CMC/PLL coating containing metformin, and the preparation method comprises the following steps: 1) preparation tHA; 2) preparing an tHA/PCL composite nanofiber membrane by an electrostatic spinning technology; 3) preparing a CMC/PLL coating containing metformin on the surface of the tHA/PCL composite nanofiber membrane by utilizing a static adsorption layer-by-layer self-assembly technology; 4) and chemically crosslinking the CMC/PLL coating by using a biological crosslinking agent genipin. The invention utilizes the regulation and control effect of metformin on the cytotoxicity of the nano-particles tHA, improves the biocompatibility and osteogenesis activity of the tHA/PCL composite fiber material, and can promote the repair and regeneration of periodontal tissues.

摘要：【中文】一种可更换钻头的台钻，包括台钻本体、齿条套筒、主轴和钻头更换机构，所述台钻本体包括底座、立柱和台钻头部，台钻基座安装于立柱上，台钻头部上安装有主轴，主轴与驱动电机连接且垂直于台钻基座；所述齿条套筒套装在主轴外并且固定安装在台钻头部上，同时主轴下端伸出齿条套筒，齿条套筒外壁上设有竖向布置的齿条结构；所述齿轮与齿条套筒上的齿条结构啮合；需要更换钻头时，摇动摇杆，使整个钻头更换机构下降，转动转盘，选用合适的钻头后，通过反向摇动摇杆，使整个钻头更换机构上升复位。本发明提供了一种稳定高效可更换钻头的台钻。 【EN】A bench drill with a replaceable drill bit comprises a bench drill body, a rack sleeve, a main shaft and a drill bit replacing mechanism, wherein the bench drill body comprises a base, an upright post and a bench drill head, the bench drill base is installed on the upright post, the main shaft is installed on the bench drill head, and the main shaft is connected with a driving motor and is perpendicular to the bench drill base; the rack sleeve is sleeved outside the main shaft and is fixedly arranged on the head part of the bench drill, meanwhile, the lower end of the main shaft extends out of the rack sleeve, and a vertically arranged rack structure is arranged on the outer wall of the rack sleeve; the gear is meshed with the rack structure on the rack sleeve; when the drill bit needs to be replaced, the rocker is rocked to enable the whole drill bit replacing mechanism to descend, the rotary table is rotated, and after a suitable drill bit is selected, the rocker is rocked reversely to enable the whole drill bit replacing mechanism to ascend and reset. The invention provides a stable and efficient bench drill with a replaceable drill bit.

摘要：【中文】本发明涉及一种免绑扎式绳索扣，包括绳扣本体，绳扣本体一端开设有绳索导槽，绳索导槽两端穿设绳扣本体，另一端开设有连接孔，所述绳索导槽输入端安装有对伸缩进行锁固的锁止机构，所述锁止机构包括开设在绳索导槽输入端一侧的安装槽，安装槽内安装有偏心齿轮，偏心齿轮下端设置有拨杆，偏心齿轮通过销轴与绳扣本体铰接，偏心齿轮伸入绳索导槽内，销轴上套装有扭簧，扭簧一端与绳扣本体连接固定，另一端与偏心齿轮连接固定，本实绳索扣，结构简单，设计合理，拆固绳索快捷方便，能对绳索进行快速锁止。 【EN】The invention relates to a binding-free rope buckle, which comprises a rope buckle body, wherein one end of the rope buckle body is provided with a rope guide groove, two ends of the rope guide groove are penetrated through the rope buckle body, the other end of the rope guide groove is provided with a connecting hole, the input end of the rope guide groove is provided with a locking mechanism for locking the extension, the locking mechanism comprises a mounting groove arranged on one side of the input end of the rope guide groove, an eccentric gear is arranged in the mounting groove, the lower end of the eccentric gear is provided with a shifting rod, the eccentric gear is hinged with the rope buckle body through a pin shaft, the eccentric gear extends into the rope guide groove, the pin shaft is sleeved with a torsional spring, one end of the torsional spring is fixedly connected with the rope buckle body, and the other end of the torsional spring is fixedly connected with the eccentric gear.

摘要：【中文】本发明提供了一种低净空套管旋挖系统以及方法，低净空套管旋挖系统包括转动连接的塔架和底盘、绳索绕组以及旋挖装置。旋挖装置包括动力头、同步卷扬机、套管、旋挖钻头机构以及钻杆。动力头通过绳索绕组与塔架连接，塔架上设置有与塔架平行的导轨，动力头与导轨滑动连接。套管和钻杆均与动力头可拆卸连接，套管套设于旋挖钻头机构外，旋挖钻头机构套设于钻杆上。同步卷扬机设置于动力头上且同步卷扬机能够带动旋挖钻头机构沿钻杆的轴向滑动。套管和钻杆的上端均与动力头的下端可拆卸连接，便于在旋挖作业过程中加装更多的套管和钻杆，从而能够根据不同的施工净空高度来选择不同的钻杆和套管，降低了低净空套管旋挖系统对施工场地的要求。 【EN】The invention provides a low-clearance sleeve rotary excavating system and a method. The rotary drilling device comprises a power head, a synchronous winch, a sleeve, a rotary drilling bit mechanism and a drill rod. The power head is connected with the tower frame through the rope winding, a guide rail parallel to the tower frame is arranged on the tower frame, and the power head is connected with the guide rail in a sliding mode. The sleeve and the drill rod are detachably connected with the power head, the sleeve is sleeved outside the rotary drilling bit mechanism, and the rotary drilling bit mechanism is sleeved on the drill rod. The synchronous winch is arranged on the power head and can drive the rotary drilling bit mechanism to slide along the axial direction of the drill rod. The upper ends of the sleeve and the drill rod are detachably connected with the lower end of the power head, so that more sleeves and drill rods can be conveniently installed in the rotary excavating operation process, different drill rods and sleeves can be selected according to different construction clearance heights, and the requirement of a low-clearance sleeve rotary excavating system on a construction site is lowered.