| 摘要 |
A shovel including a dipper for gathering material from a bank. The shovel further includes a hoist motor operating control for operating a hoist motor, a speed sensor for monitoring the hoist motor speed, a torque sensor for monitoring the hoist motor torque, and a mechanism communicating with a crowd motor control, the torque sensor and the speed sensor for moving a dipper handle toward a boom when the hoist motor speed is below a low-speed value while under high torque, and for permitting movement of the dipper away from the boom when the hoist motor speed is above the low-speed value or not under high torque. More particularly, the dipper handle moving mechanism further includes a mechanism for varying the selected speed of movement of the dipper toward the boom, and the shovel further includes a mechanism for determining the amount of time the hoist motor speed is below a predetermined low-speed value while under high torque, and a mechanism for adjusting the selected speed of movement of the dipper toward the boom upward if the time the hoist motor speed is below a predetermined low-speed value while under high torque is too large, and for adjusting the selected speed of movement of the dipper toward the boom downward if the time the hoist motor speed is below a predetermined low-speed value while under high torque is too small.
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