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10 条记录 (耗时 0.032 秒)

    Control system for a hydraulic press brake
    9.
    发明授权
    Control system for a hydraulic press brake 失效
    液压机制动控制系统

    公开(公告)号：US5644915A

    公开(公告)日：1997-07-08

    申请号：US637447

    申请日：1996-04-25

    申请人： Paul A. Dressing ,  Dean M. Valvano

    发明人： Paul A. Dressing ,  Dean M. Valvano

    IPC分类号： B30B15/16 ,  F15B21/08 ,  F16D31/02 ,  F15B11/00

    CPC分类号： B30B15/24 ,  F15B21/087

    摘要： A control system for controlling the movement of the ram of a press or press brake of the type having one or two main cylinders with pistons operatively attach to the ram. The control system comprises a programmable processor with inputs from a pressure transducer indicating the pressure applied to the one or two pistons and a linear potentiometer for each side of the ram to indicate ram position and levelness. The control system further includes a hydraulic circuit operated by outputs from the processor. The hydraulic circuit comprises a variable volume load sense-controlled pump supplying hydraulic fluid through a speed control assembly to a solenoid-actuated directional valve determining upward and downward movement of the ram. The speed control assembly comprises at least two lines connected to the output line of the pump and to the speed control assembly output line to the directional valve. At least one of the at least two speed control assembly lines is provided with a restricting orifice. At least one of the at least two speed control assembly lines is provided with a normally closed solenoid-actuated valve. All of the solenoid actuated valves of the hydraulic circuit are controlled by outputs from the processor.

    摘要翻译： 一种用于控制具有一个或两个主缸的类型的压力机或压力制动器的压头的运动的控制系统，活塞可操作地附接到冲头。 该控制系统包括可编程处理器，其具有来自压力传感器的输入，其指示施加到一个或两个活塞的压力，以及用于柱塞每侧的线性电位计，以指示压头位置和水平度。 控制系统还包括由处理器的输出操作的液压回路。 该液压回路包括一个可变容积的负载感测控制泵，其通过速度控制组件向液压流体供应电磁致动的换向阀，以确定压头的向上和向下运动。 速度控制组件包括连接到泵的输出管线和连接到方向阀的速度控制组件输出线的至少两条管线。 至少两个速度控制组装线中的至少一个设置有限制孔。 所述至少两个速度控制装配线中的至少一个设置有常闭电磁致动阀。 液压回路的所有电磁致动阀都由处理器的输出控制。

    Counterforce and holding device
    10.
    发明授权
    Counterforce and holding device 失效
    反力装置

    公开(公告)号：US5303549A

    公开(公告)日：1994-04-19

    申请号：US740280

    申请日：1991-08-05

    申请人： Merrill E. Berchtold ,  Dean M. Valvano

    发明人： Merrill E. Berchtold ,  Dean M. Valvano

    IPC分类号： B23Q11/00 ,  E21B19/086 ,  F15B1/02 ,  F15B20/00 ,  F16B31/02

    CPC分类号： F15B20/002 ,  B23Q11/001 ,  E21B19/086 ,  F15B1/02

    摘要： A counterforce cylinder and piston exert an upward force on the vertically movable slide of a machine. The cylinder pressure line handles reverse flows during operations of the slide. A pilot-operated checkvalve (normally closed) is inserted in the cylinder line between a pressure source and the counterforce cylinder, and is held open during usual operation of the machine. An accumulator is branch-connected to the cylinder line, at a point between the checkvalve and counterforce cylinder. During machine operations, the accumulator stores pressurized fluid; at shutdown of power, the fast-acting checkvalve closes and reliably seals the cylinder line while the accumulator provides pressure to maintain the counterforce cylinder and slide in a substantially constant holding position for several days.

    摘要翻译： 反作用气缸和活塞在机器的可垂直移动的滑块上施加向上的力。 气缸压力线在滑块操作期间处理反向流动。 先导操作的止回阀（常闭）插入压力源和反作用气缸之间的气缸管路中，并且在机器的通常操作期间保持打开。 在止回阀和反作用气缸之间的点处，蓄能器分支连接到气缸管线。 在机器操作期间，蓄能器存储加压流体; 在停电时，快速作用的止回阀关闭并可靠地密封气缸管线，同时蓄能器提供压力以保持反作用气缸并且在基本上恒定的保持位置中滑动数天。