Device for drilling in the railway sleepers, the screw holes or pulls - back, and to tighten or loosen the screws or pulls - bottom or their nuts

• 1. 具有锥形螺钉头的螺钉、螺钉的应用、和螺钉钻入埋头孔的方法 [P] . 中国专利： CN111316005B . 2021.10.26
• 2. 具有锥形螺钉头的螺钉、螺钉的应用、和螺钉钻入埋头孔的方法 [P] . 中国专利： CN111316005A . 2020-06-19
• 3. Ratchet spanner for tightening and loosening different screws and screwing nuts, has pin guided through hole of coupling element, and spring pulled on pin of retaining piece and provided between retaining piece and coupling element [P] . 德国专利： DE102012008221A1 . 2013-10-31

  机译： 棘轮扳手，用于拧紧和松开不同的螺钉和螺母，其销钉穿过连接件的孔，弹簧拉到固定件的销钉上，并设置在固定件和连接件之间

• 4. Apparatus combined to tighten and loosen the pulls - bottoms of boring or drilling the holes in the materials [P] . 法国专利： FR560362A . 1923-10-03

  机译： 结合使用的设备可以拉紧和松开拉杆-在材料的钻孔或钻孔底部

• 5. Apparatus for the screwing of the pulled - bottoms in railway sleepers [P] . 法国专利： FR423690A . 1911-04-24

  机译： 铁路轨枕拉底装置的拧紧装置

• 1. Limit analysis of vertical anti-pulling screw pile group under inclined loading on 3D elastic-plastic finite element strength reduction method [J] . DONG Tian-wen, ZHENG Ying-ren 中南大学学报（英文版） . 2014,第003期
• 2. Positioning of Screw Holes Group Based on Digital Camera and Digital Control Drilling [J] . FENG Wenhao, LI Jiansong, YAN Li, 地球空间信息科学学报（英文版） . 2004,第004期
• 3. Pull-Out Strength of Screws in Screw Chases: Part 1 [C] . James C. LaBelle, J. Randolph Kissell, Tanya A. Dolby International Aluminium Conference . 2016
• 4. A Comparison of Porcelain Fracture Resistance for Cement Retained and Screw-Cement Retained Implant Supported Milled Posterior Crowns with Screw Access Hole Preparations at Pre and Post Firing Stages [D] . Cabrera, Jesus Enrique. 2017
• 5. Dual Motor Drill Continuously Measures Drilling Energy to Calculate Bone Density and Screw Pull-out Force in Real Time [O] . Brian B. Gilmer, Sarah D. Lang 2018
• 6. Dual Motor Drill Continuously Measures Drilling Energy to Calculate Bone Density and Screw Pull-out Force in Real Time [O] . Brian B. Gilmer, Sarah D. Lang 2018

• 1. Limit analysis of vertical anti-pulling screw pile group under inclined loading on 3D elastic-plastic finite element strength reduction method [J] . 董天文 ,郑颖人 . 中南大学学报 . 2014,第003期
• 2. Potential contribution of pedicle screw design to loosening rate in patients with degenerative diseases of the lumbar spine:An observational study [J] . Andrey Bokov ,Svetlana Pavlova ,Anatoliy Bulkin . 世界骨科杂志：英文版 . 2021,第5期
• 3. An Analysis on the Transmission Shaft Fracture of Screw Drill [J] . Bin LUO ,Gaofei LIU ,Jian DU . International Journal of Technology Management . 2015,第010期