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    • 9. 发明公开
    • Hydraulic cylinder for example for use in a hydraulic tool
    • Hydraulischer Zylinder zum BeispielfürhydraulischesArbeitsgerät
    • EP2813309A1
    • 2014-12-17
    • EP14171734.8
    • 2014-06-10
    • Demolition and Recycling Equipment B.V.
    • De Gier, Gertrudis Maria Gerardus
    • B23D17/00E02F3/96F15B20/00F15B11/024
    • F15B15/149E02F3/965E02F9/2267E02F9/2271F15B11/022F15B11/024F15B13/0401F15B20/007F15B2011/0243F15B2211/30505F15B2211/3058F15B2211/329F15B2211/355F15B2211/50518F15B2211/5153F15B2211/55F15B2211/775F15B2211/8636F15B2211/8752
    • The invention relates to a hydraulic cylinder 20, for example for use in a hydraulic tool, comprising at least one piston/cylinder combination composed of a cylinder body and a piston 14a accommodated in said cylinder body and provided with a piston rod 14 that projects from said cylinder body, wherein the cylinder body and the piston body define a first cylinder chamber 21a while the cylinder body, the piston body and the piston rod define a second cylinder chamber 21b, and wherein during operation the piston performs alternating forward and return operational cycles under the influence of a fluidum under pressure that is conducted to the first and the second cylinder chamber through a first and a second line, respectively, and a control valve 24 which regulates the supply of a fluid under pressure through the first or the second line to the piston/cylinder combination.
      The invention has for its object to provide an improved actuating cylinder as described above which immediately acts on the hydraulic system in the event of the emergency situations sketched above and which prevents permanent damage to the various components. According to the invention, the hydraulic cylinder is for this purpose characterised in that it comprises a safety valve 40 which is passive in a first position and which in a second position, if the pressure in the second cylinder chamber is higher than a preset load pressure, connects the second cylinder chamber to the first cylinder chamber via a differential valve 30 .
    • 本发明涉及一种液压缸20,例如用于液压工具中的液压缸20,该液压缸20包括至少一个活塞/缸组合,其由缸体和容纳在所述缸体中的活塞14a组成,并设置有活塞杆14,活塞杆14从 所述缸体,其中所述缸体和所述活塞主体限定第一缸室21a,同时所述缸体,所述活塞主体和所述活塞杆限定第二缸室21b,并且其中在运行期间所述活塞执行交替的前进和返回操作循环 在受压下的液体的影响分别通过第一和第二管线传导到第一和第二气缸室;以及控制阀24,其调节通过第一或第二管线的压力下的流体供应 到活塞/气缸组合。 本发明的目的是提供一种如上所述的改进的致动缸,其在上面描绘的紧急情况下立即作用在液压系统上,并且防止对各种部件的永久性损坏。 根据本发明,液压缸为此目的的特征在于其包括安全阀40,其在第一位置是被动的,并且在第二位置,如果第二气缸室中的压力高于预设的负载压力 通过差速阀30将第二汽缸室与第一汽缸室连接。