Solid material comminution or disintegration – Apparatus – With automatic control
Patent
1997-11-30
2000-09-19
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With automatic control
60452, 91446, 241 36, 24110174, B02C 2500
Patent
active
061199672
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a control circuit of a transportable crusher and more specifically to a control circuit of a transportable crusher which can perform an optimum hydraulic drive.
BACKGROUND ART
Heretofore, as this type of control circuit of transportable crusher, there has been proposed the control circuit of the transportable crusher shown in FIG. 14 (see Japanese Utility Model Laid-open No. 6-81641/1994).
In FIG. 14, a variable displacement left-side traveling hydraulic pump 101, a variable displacement right-side traveling hydraulic pump 102, and a fixed displacement controlling hydraulic pump 103 are driven by an engine (not shown) mounted in the transportable crusher.
A hydraulic fluid discharged from the left-side traveling hydraulic pump 101 flows into a P port of a left-side traveling switching control valve 104 (hereinafter, referred to as left-side control valve 104). This hydraulic fluid is supplied to a hydraulic motor 105 in a hydraulically drivable type forwardly reversely rotatable left-side traveling truck connected to an A port and a B port of the left-side control valve 104.
The hydraulic fluid discharged from the right-side traveling hydraulic pump 102 flows into the P port of a right-side traveling switching control valve 106 (hereinafter, referred to as a right-side control valve 106). This hydraulic fluid is supplied to a hydraulic motor 107 in a hydraulically drivable type forwardly reversely rotatable right-side traveling truck connected to the A port and the B port of the right-side control valve 106.
When the left-side control valve 104 is positioned at its neutral position S, the left-side control valve 104 is "an open-center type six-port and three-position pilot hydraulic control valve" which is communicated with the P port and an N port so as to bypass a flow. The left-side control valve 104 and the right-side control valve 106 have the same structure.
When each of the left-side control valve 104 and the right-side control valve 106 is positioned at its neutral position S, the hydraulic fluid discharged from the left-side traveling hydraulic pump 101 and the hydraulic fluid discharged from the right-side traveling hydraulic pump 102 flow out of the N ports. After that time, the hydraulic fluids are joined to each other and flow into the P port of a hydraulic control valve 108 for the crusher. This hydraulic fluid is supplied to a hydraulic motor 109 for the crusher connected to the A port and the B port of the hydraulic control valve 108 for the crusher. Two relief valves 110, 110 for the crusher are arranged in this control circuit in such a manner that a supplied hydraulic pressure is not a predetermined value or higher during a forward-and-reverse rotation of the hydraulic motor 109 for the crusher.
The hydraulic control valve 108 for the crusher also has the same structure as the left-side control valve 104 and the right-side control valve 106. When the hydraulic control valve 108 for the crusher is positioned at its neutral position S, its P port and its N port are communicated with each other so as to drain the hydraulic fluid into a tank 123.
When the left-side control valve 104 and the right-side control valve 106 are switching-controlled to their first switching position F so that the respective P port is communicated with the respective A port, the left-side hydraulic motor 105 and the right-side hydraulic motor 107 are rotated forwardly. On the other hand, when the left-side control valve 104 and the right-side control valve 106 are switching-controlled to their second switching position R so that the respective P port is communicated with the respective B port, the left-side hydraulic motor 105 and the right-side hydraulic motor 107 are rotated in reverse.
When the left-side hydraulic motor 105 and the right-side hydraulic motor 107 are driven, that is, when the hydraulic pressure from the respective P port is supplied to either the respective A port or the respective B port in the left-side control valve 104 and the right-side co
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Ikegami Katsuhiro
Kitani Toshio
Koyanagi Satoru
Nakayama Toru
Ozawa Yuji
Komatsu Ltd.
Rosenbaum Mark
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