JPH0218485U - - Google Patents

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Publication number
JPH0218485U
JPH0218485U JP9578388U JP9578388U JPH0218485U JP H0218485 U JPH0218485 U JP H0218485U JP 9578388 U JP9578388 U JP 9578388U JP 9578388 U JP9578388 U JP 9578388U JP H0218485 U JPH0218485 U JP H0218485U
Authority
JP
Japan
Prior art keywords
pressure
valve
swing
control valve
oil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9578388U
Other languages
Japanese (ja)
Other versions
JPH0632938Y2 (en
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP9578388U priority Critical patent/JPH0632938Y2/en
Publication of JPH0218485U publication Critical patent/JPH0218485U/ja
Application granted granted Critical
Publication of JPH0632938Y2 publication Critical patent/JPH0632938Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

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

第１図および第２図は本考案の実施例を示す油
圧回路図であり、第１図は中立ブレーキモードで
使用している状態、第２図は中立フリーモードで
使用している状態をそれぞれ示している。第３図
は電磁比例圧力制御弁の制御特性図、第４図は電
磁比例圧力制御弁の別の実施例を示す要部油圧回
路図である。 １…油圧ポンプ、２…選択弁、３…方向切換弁
、５…電磁比例圧力制御弁、６…旋回モータ、７
…タンク、８…コントローラ（制御手段）、１０
…主回路、１７…メインリリーフ弁、１８…電磁
切換弁（切換手段）、４１，４２…モータ側通路
、５１，５２…チエツク弁、５３，５４…親弁、
５７…子弁（電磁比例リリーフ弁）、７２…背圧
弁、５３ａ，５４ａ…ポペツト、５７ａ…電磁比
例減圧弁。 Figures 1 and 2 are hydraulic circuit diagrams showing an embodiment of the present invention. Figure 1 shows the state in which it is used in the neutral brake mode, and Figure 2 shows the state in which it is used in the neutral free mode. It shows. FIG. 3 is a control characteristic diagram of the electromagnetic proportional pressure control valve, and FIG. 4 is a main hydraulic circuit diagram showing another embodiment of the electromagnetic proportional pressure control valve. DESCRIPTION OF SYMBOLS 1... Hydraulic pump, 2... Selection valve, 3... Directional switching valve, 5... Electromagnetic proportional pressure control valve, 6... Swivel motor, 7
...Tank, 8...Controller (control means), 10
... Main circuit, 17... Main relief valve, 18... Solenoid switching valve (switching means), 41, 42... Motor side passage, 51, 52... Check valve, 53, 54... Main valve,
57... Child valve (proportional electromagnetic relief valve), 72... Back pressure valve, 53a, 54a... Poppet, 57a... Proportional electromagnetic pressure reducing valve.

Claims (1)

【実用新案登録請求の範囲】 １ ポンプ吐出油を方向切換弁を介して旋回モー
タに供給して旋回モータの回転方向を制御するク
レーンの旋回制御装置において、ポンプと方向切
換弁との間の主回路に主回路の圧油をタンクにア
ンロードする状態と、オンロードする状態とに切
換自在の切換手段を設け、方向切換弁と旋回モー
タの両側のポートとの間に、それぞれ旋回モータ
への吸込み方向の流れを許容するチエツク弁と、
旋回モータから方向切換弁側への排出油の圧力を
制御する電磁比例圧力制御弁とをパラレルに配置
させ、旋回の要停止時に上記切換手段に主回路の
圧油をアンロードさせる切換信号を出力するとと
もに、旋回モータの排出側の電磁比例圧力制御弁
に圧力制御信号を出力してモータ排出側の圧力を
制御する制御手段を設けていることを特徴とする
クレーンの旋回制御装置。 ２ 方向切換弁からタンクへの戻り油回路に背圧
弁を設け、この背圧弁のクラツキング圧力を電磁
比例圧力制御弁の最低設定圧よりも高くしたこと
を特徴とする請求項１記載のクレーンの旋回制御
装置。[Claims for Utility Model Registration] 1. In a swing control device for a crane that controls the rotational direction of the swing motor by supplying pump discharge oil to the swing motor via the directional control valve, The circuit is provided with a switching means that can freely switch between unloading and on-loading the main circuit pressure oil to the tank, and between the directional control valve and the ports on both sides of the swing motor, a check valve that allows flow in the suction direction;
An electromagnetic proportional pressure control valve that controls the pressure of oil discharged from the swing motor to the directional switching valve side is arranged in parallel, and a switching signal is output to the switching means to unload the pressure oil in the main circuit when the swing needs to be stopped. A swing control device for a crane, further comprising a control means for controlling the pressure on the discharge side of the motor by outputting a pressure control signal to an electromagnetic proportional pressure control valve on the discharge side of the swing motor. 2. The crane swing according to claim 1, wherein a back pressure valve is provided in the return oil circuit from the directional control valve to the tank, and the cracking pressure of the back pressure valve is set higher than the minimum setting pressure of the electromagnetic proportional pressure control valve. Control device.
JP9578388U 1988-07-20 1988-07-20 Crane turning control device Expired - Lifetime JPH0632938Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9578388U JPH0632938Y2 (en) 1988-07-20 1988-07-20 Crane turning control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9578388U JPH0632938Y2 (en) 1988-07-20 1988-07-20 Crane turning control device

Publications (2)

Publication Number Publication Date
JPH0218485U true JPH0218485U (en) 1990-02-07
JPH0632938Y2 JPH0632938Y2 (en) 1994-08-31

Family

ID=31320498

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9578388U Expired - Lifetime JPH0632938Y2 (en) 1988-07-20 1988-07-20 Crane turning control device

Country Status (1)

Country Link
JP (1) JPH0632938Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454923A1 (en) * 1990-04-25 1991-11-06 Kabushiki Kaisha Kobe Seiko Sho Slewing control device for crane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454923A1 (en) * 1990-04-25 1991-11-06 Kabushiki Kaisha Kobe Seiko Sho Slewing control device for crane
JPH047295A (en) * 1990-04-25 1992-01-10 Kobe Steel Ltd Crane revolution control unit

Also Published As

Publication number Publication date
JPH0632938Y2 (en) 1994-08-31

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