JPH0221303U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の油圧回路図。第２図はバルブ
ケース平面図一部断面図。第３図は同じく側面図
一部断面図。第４図は第２図におけるＸ―Ｘ矢視
断面図。第５図は上昇時の電磁バルブのタイミン
グチヤート。第６図は同じく下降時のタイミング
チヤートである。 １…アクチユエーター、３…油圧ポンプ、６…
チエツクバルブ、９…上昇用主弁、２０…下降用
主弁、９ａ，２０ａ…背室、１１，２２…パイロ
ツト油路、１３，１４，２４，２５…電磁弁、１
５，２６…絞り。 Figure 1 is a hydraulic circuit diagram of the present invention. Figure 2 is a plan view of the valve case, partially in section. FIG. 3 is also a side view and partially sectional view. FIG. 4 is a sectional view taken along the line X--X in FIG. 2. Figure 5 is a timing chart of the solenoid valve when ascending. FIG. 6 is also a timing chart during descent. 1...actuator, 3...hydraulic pump, 6...
Check valve, 9... Main valve for ascending, 20... Main valve for descending, 9a, 20a... Back chamber, 11, 22... Pilot oil passage, 13, 14, 24, 25... Solenoid valve, 1
5, 26...Aperture.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 油圧ポンプ３とチエツクバルブ６との間に上昇
用主弁９を配し、該チエツクバルブ６とアクチユ
エーター１との間に下降用主弁２０を配し、該上
昇用主弁９・下降用主弁２０からそれぞれパイロ
ツト油路１１，２２を分岐して設けて上昇用主弁
９、下降用主弁２０の背室９ａ，２０ａと連通す
ると共に、該パイロツト油路１１，２２をタンク
側へ連通・遮断するオープン位置、クローズ位置
の２位置切換形の上昇用電磁弁及び下降用の電磁
弁を配したものにおいて、該上昇用電磁弁１３，
１４存び下降用電磁弁２４，２５を、その一方は
オープン側に絞り１５，２６を有した電磁弁１３
，２４と、他方はオープン側に絞りを持たない電
磁弁１４，２５の２個を並列に接続して構成する
と共に、一方の上昇用及び下降用電磁弁１３，１
４がオープン位置とクローズ位置との間でパルス
駆動する際には他方の上昇用及び下降用電磁弁１
４，２５をクローズ位置に保持させたことを特徴
とする油圧制御装置。 A main valve 9 for ascending is disposed between the hydraulic pump 3 and the check valve 6, a main valve 20 for descending is disposed between the check valve 6 and the actuator 1, and a main valve 9 for descending is disposed between the check valve 6 and the actuator 1. Pilot oil passages 11 and 22 are branched from the main valve 20 to communicate with the back chambers 9a and 20a of the main valve 9 for ascending and the main valve for descending 20, and the pilot oil passages 11 and 22 are connected to the tank side. In a device equipped with a two-position switching type ascending solenoid valve of an open position and a closed position that communicates with and shuts off communication with and a descending solenoid valve, the ascending solenoid valve 13,
14 and a lowering solenoid valve 24, 25, one of which has a throttle 15, 26 on the open side.
, 24 and the other is a solenoid valve 14, 25 which does not have a throttle on the open side.
4 is pulse-driven between the open position and the closed position, the other rising and falling solenoid valve 1
A hydraulic control device characterized in that 4 and 25 are held in a closed position.