JPH0383264U

JPH0383264U -

Info

Publication number: JPH0383264U
Application number: JP14472089U
Authority: JP
Priority date: 1989-12-15
Filing date: 1989-12-15
Publication date: 1991-08-23

Description

[Brief explanation of drawings]

第１図ないし第５図は本考案の第１の実施例を
示し、第１図はバツクホウ式油圧シヨベルの全体
図、第２図は上部旋回体を破断して示す下部走行
体の部分平面図、第３図は第２図中の−矢示
方向断面図、第４図はカウンタウエイトの吊上げ
時にスイツチが開、閉される状態を示す説明図、
第５図は油圧回路図、第６図は第２の実施例を示
すローデイング式油圧シヨベルの全体図、第７図
および第８図は従来技術を示し、第７図は油圧シ
ヨベルの全体図、第８図は油圧回路図である。８，７１……作業装置、９，７２……ブーム、
１０，７３……アーム、１１，７４……バケツト
、１３，７６……アームシリンダ、１８Ａ，１８
Ｂ……主管路、２０……油圧ポンプ、２１……タ
ンク、２２……方向切換弁、２４，５５……減圧
弁型パイロツト弁、２８Ａ，２８Ｂ，５６Ａ，５
６Ｂ……パイロツト管路、４１……下部走行体、
４４……上部旋回体、４５……本体フレーム、４
５Ａ……取付板、５１……索条、５２，５３……
スイツチ、５７……切換弁、５９……電磁弁（絞
り弁）、６１……電磁弁（停止手段）。 Figures 1 to 5 show a first embodiment of the present invention, Figure 1 is an overall view of a backhoe type hydraulic excavator, and Figure 2 is a partial plan view of the lower traveling body with the upper revolving body cut away. , FIG. 3 is a sectional view in the direction of the - arrow in FIG. 2, and FIG. 4 is an explanatory diagram showing the state in which the switch is opened and closed when lifting the counterweight.
FIG. 5 is a hydraulic circuit diagram, FIG. 6 is an overall view of a loading type hydraulic excavator showing a second embodiment, FIGS. 7 and 8 are conventional techniques, and FIG. 7 is an overall view of a hydraulic excavator. FIG. 8 is a hydraulic circuit diagram. 8,71...Working equipment, 9,72...Boom,
10,73...Arm, 11,74...Bucket, 13,76...Arm cylinder, 18A,18
B... Main pipe, 20... Hydraulic pump, 21... Tank, 22... Directional switching valve, 24, 55... Pressure reducing valve type pilot valve, 28A, 28B, 56A, 5
6B... Pilot pipe line, 41... Lower running body,
44... Upper revolving body, 45... Main body frame, 4
5A... Mounting plate, 51... Cable, 52, 53...
switch, 57... switching valve, 59... solenoid valve (throttle valve), 61... solenoid valve (stopping means).

Claims

[Claims for Utility Model Registration] (1) A main body frame of a work machine, a counterweight detachably attached to the rear of the main body frame, and lifting and lowering of the counterweight while hanging from the rear of the main body frame. a pair of main conduits for supplying and discharging hydraulic pressure from a hydraulic source to and from the actuator, and a pair of main conduits provided in the middle of each of the main conduits to direct the actuator in the direction of lifting and suspending the counterweight. A counterweight attaching/detaching device for a work machine comprising a direction switching valve that switches the direction of hydraulic pressure supplied to and discharged from the hydraulic pressure source to and discharged from the actuator for driving,
a throttle located between the actuator and the directional control valve, provided in at least one of the main pipelines, and exerting a throttling effect on the pressure oil flowing in the main pipeline during lifting of the counterweight; A counterweight attaching/detaching device for a working machine, comprising: a valve; and a stopping means for returning the directional switching valve to a neutral position and stopping an actuator when the counterweight is lifted to a predetermined position. (2) The directional switching valve has a hydraulic pilot section, and the hydraulic pilot section is constituted by a hydraulic pilot type directional switching valve connected to a pressure reducing valve type pilot valve via a pilot line, and the stopping means is a counterweight attaching/detaching device for a working machine according to claim (1), which is constituted by a solenoid valve provided in the middle of a pilot conduit. (3) A working device consisting of a boom, an arm, and a bucket is provided in the front part of the main body frame, and the actuator is constituted by an arm cylinder that moves the arm of the working device up and down. Counterweight attachment/detachment device for work equipment as described in paragraph (1) or (2).