JPS58170381U - Speed control circuit for cranes, etc. - Google Patents
Speed control circuit for cranes, etc.Info
- Publication number
- JPS58170381U JPS58170381U JP6548482U JP6548482U JPS58170381U JP S58170381 U JPS58170381 U JP S58170381U JP 6548482 U JP6548482 U JP 6548482U JP 6548482 U JP6548482 U JP 6548482U JP S58170381 U JPS58170381 U JP S58170381U
- Authority
- JP
- Japan
- Prior art keywords
- speed control
- valve
- hydraulic pump
- pilot valve
- control circuit
- 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.)
- Pending
Links
Landscapes
- Control And Safety Of Cranes (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の速度制御回路図、第２図及び第３図は本
考案に係る流量制御線図、第４図は本考案の一実施例を
示す速度制御回路図である。
１・・・可変容量形油圧ポンプ、１ａ・・・制御部、２
・・・方向切換弁、９・・・操作用油圧ポンプ、１０・
・・パイロット弁、１１． １２． １４．２１．２２
゜２３・・・管路、１３・・・シャトル弁、２４．２５
゜２６・・・減圧弁、２７，２８．２９・・・切換弁。FIG. 1 is a conventional speed control circuit diagram, FIGS. 2 and 3 are flow rate control diagrams according to the present invention, and FIG. 4 is a speed control circuit diagram showing an embodiment of the present invention. 1... Variable displacement hydraulic pump, 1a... Control unit, 2
... Directional switching valve, 9... Hydraulic pump for operation, 10.
...Pilot valve, 11. 12. 14.21.22
゜23...Pipeline, 13...Shuttle valve, 24.25
゜26...Pressure reducing valve, 27,28.29...Switching valve.
Claims (1)
を有し、そのパイロット弁の２次圧力によって可変容量
形油圧ポンプの吐出油を制御すると共に、その吐出油を
切換制御する方向切換弁を前記パイロット弁の操作に応
して作動させるように構成したクレーン等の速度制御回
路において、パイロット弁の２次圧力を可変容量形油圧
ポンプの制御部へ導く管路の途中に複数のバイパス管路
を設け、それぞれのバイパス管路に設定圧を順次具なら
せた減圧弁とその管路番連通または遮断する切換弁とを
直列に設け、任意の切換弁を連通側へ切換えることによ
り、パイロット弁の操作量に関係なく選定された減圧弁
の２次圧力によって可変容量形油圧ポンプが制御されて
複数段の安定した微低速制御を行うことができるように
構成したことを特徴とする速度制御回路。It has a pilot valve that switches and controls the discharge oil of the operating hydraulic pump, and controls the discharge oil of the variable displacement hydraulic pump by the secondary pressure of the pilot valve, and also includes a directional switching valve that switches and controls the discharge oil. In a speed control circuit for a crane, etc. configured to operate in response to the operation of a pilot valve, multiple bypass pipes are installed in the middle of the pipe that leads the secondary pressure of the pilot valve to the control section of the variable displacement hydraulic pump. A pressure reducing valve that sequentially applies a set pressure to each bypass pipe and a switching valve that connects or shuts off the pipe number are installed in series, and by switching any switching valve to the communication side, the pilot valve can be controlled. A speed control circuit characterized in that a variable displacement hydraulic pump is controlled by the secondary pressure of a selected pressure reducing valve regardless of the amount of operation, and is configured to perform stable micro-low speed control in multiple stages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6548482U JPS58170381U (en) | 1982-05-07 | 1982-05-07 | Speed control circuit for cranes, etc. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6548482U JPS58170381U (en) | 1982-05-07 | 1982-05-07 | Speed control circuit for cranes, etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58170381U true JPS58170381U (en) | 1983-11-14 |
Family
ID=30075436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6548482U Pending JPS58170381U (en) | 1982-05-07 | 1982-05-07 | Speed control circuit for cranes, etc. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58170381U (en) |
-
1982
- 1982-05-07 JP JP6548482U patent/JPS58170381U/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS58170381U (en) | Speed control circuit for cranes, etc. | |
| JPS58170379U (en) | Speed control circuit for cranes, etc. | |
| JPS58170380U (en) | Speed control circuit for cranes, etc. | |
| JPS592771U (en) | Speed control circuit for cranes, etc. | |
| JPS59163207U (en) | Variable pressure reducing valve operating device | |
| JPS61105388U (en) | ||
| JPS6012703U (en) | Control circuit for hydraulic motor for travel | |
| JPS58104405U (en) | Hydraulic motor drive circuit | |
| JPS5967602U (en) | hydraulic circuit | |
| JPS6120901U (en) | Pump control circuit for cranes, etc. | |
| JPS59102649U (en) | Hydraulic drive control device | |
| JPS60191704U (en) | hydraulic system | |
| JPS5925701U (en) | Hydraulic pump discharge amount control circuit | |
| JPS58186202U (en) | Hydraulic servo device | |
| JPS5892501U (en) | hydraulic circuit | |
| JPH0175604U (en) | ||
| JPS6110366U (en) | Front loader hydraulic circuit | |
| JPS58137007U (en) | Mobile agricultural machinery hydraulic system | |
| JPS641878U (en) | ||
| JPS59177808U (en) | hydraulic circuit | |
| JPS591903U (en) | Hydraulic pressure circuit switching speed control device | |
| JPS6028284U (en) | Hydraulic pump control device | |
| JPS62147703U (en) | ||
| JPS58152578U (en) | Pump flow control device | |
| JPS59185454U (en) | Neutral position control circuit for hydraulic equipment |