345D, 349D and 349D2 Excavators Hydraulic System Caterpillar


Counterweight (Removal and Installation Hydraulic System)

Usage:

345D L BYC



图 1g01520499

切换开关、操纵杆和球阀的位置

(4) 控制阀

(5) 杆

(6) 球阀(OPEN [打开] 位置)

(9) 滑阀

(10) 管路

(11) 电磁阀

(16) 管路

(17) 先导排油管路

(23) 切换开关




图 2g01520517

局部液压系统示意图

(1) 主控制阀

(2) 斗杆 I 控制阀

(3) 斗杆 II 控制阀

(4) 控制阀

(5) 杆

(6) 球阀

(7) 配重提升油缸

(8) 单向阀

(9) 滑阀

(10) 管路

(11) 电磁阀

(12) 反向流量控制装置比例电磁阀

(13) 引导轮泵

(14) 驱动泵

(15) 先导泵

(16) 管路

(17) 先导排油管路

(18) 先导歧管

(19) 液压锁定电磁阀

(20) 液压油箱

(21) 通向液压油箱的排油管路

(22) 安全阀

启用配重的拆卸设备。

液压启动操纵杆必须处于 LOCKED(锁定)位置,以启动配重拆除回路。 球阀 (6) 必须处于 OPEN(打开)位置。 通过切换开关 (23) 启用配重拆除回路。 切换开关 (23) 使电磁阀 (11) 通电。 电磁阀 (11) 向下移动,先导油经过电磁阀 (11) 到达管路 (10) 。 管路 (10) 中的先导油使阀 (9) 移动。 泵油从管路 (16) 经过滑阀 (9) 流向控制阀 (4) 。

先导油还通过管路 (10) 流向斗杆 II 控制阀 (3) 和 NFC 管路中的梭阀流向驱动泵调节器。 来自电磁阀 (11) 和 NFC 信号的先导油压力输送至梭阀。 向泵调节器输送最高压力,以减少泵的行程。 这确保流向配重油缸的泵流为最低流量。

配重下降操作。

当操纵杆 (5) 下拉,控制阀 (4) 向下移动。 泵油流过控制阀 (4) 进入提升油缸 (7) 的连杆端。 机油从提升油缸的缸盖端排出,经过安全阀 (22) 、球阀 (6) 和控制阀 (4) 。 机油流过控制阀 (4) 和管路 (21) 进入液压油箱。 配重下降。 请参阅插图 2。

配重上升操作




图 3g01521479

当操纵杆 (5) 上拉,控制阀 (4) 向上移动。 泵油流过球阀 (6) 和安全阀 (22) 。 泵油流过单向阀 (8) 进入提升油缸 (7) 的缸盖端。 机油从提升油缸 (7) 的连杆端流出,流入控制阀 (4) 。 机油流过控制阀 (4) 和管路 (21) 进入液压油箱。 配重上升。 当操纵杆 (5) 位于 NEUTRAL(空档) 位置时,单向阀 (8) 阻止提升油缸 (7) 缸盖端的机油流出提升油缸。 请参阅插图 3。

油缸缸盖端的卸压操作

当配重提升油缸 (7) 由外力向下推时,提升油缸缸盖端的机油压力上升。 安全阀 (22) 处可以感应到油压。 当安全阀打开,机油流回液压油箱。

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