JPS5628302A - Speed control circuit of crane or the like - Google Patents
Speed control circuit of crane or the likeInfo
- Publication number
- JPS5628302A JPS5628302A JP10402779A JP10402779A JPS5628302A JP S5628302 A JPS5628302 A JP S5628302A JP 10402779 A JP10402779 A JP 10402779A JP 10402779 A JP10402779 A JP 10402779A JP S5628302 A JPS5628302 A JP S5628302A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- valve
- piping
- speed control
- control
- 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
Links
Landscapes
- Control And Safety Of Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
PURPOSE: To make a stationary extremely low speed control possible, by arranging a change-over valve in a piping for leading a secondary pressure of a pilot valve, which is switched and controls the discharge of oil of a hydraulic pump for operating a crane, into a control part of a variable volume type hydraulic pump.
CONSTITUTION: When an operating lever 10a of a pilot valve 10 is moved in a direction shown by the arrow, an oil pressure is developed in a secondary side piping 11 according to its degree of operation, and the oil pressure is conducted through a shuttle valve 13 into a control part 1a of a variable volume type hydraulic pump 1 to control the discharge flow amount of the pump 1. Also the pressure oil developed in the piping 11 is conducted to a pressure receiving part 2a to switch a direction cheange-over valve 2 to rotate a hydraulic motor 4 in a direction shown by the arrow. In this speed control circuit, a change-over valve 15 is provided in an intermediate of a piping 14 that leads the secondary pressure of the pilot valve 10 into the control part 1a. When the change-over valve 15 is switched to an interception side, a secondary side piping 17 of a pressure control valve 16 is communicated with the control part 1a, so that the extremely low speed control becomes possible.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10402779A JPS595163B2 (en) | 1979-08-17 | 1979-08-17 | Speed control circuit for cranes, etc. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10402779A JPS595163B2 (en) | 1979-08-17 | 1979-08-17 | Speed control circuit for cranes, etc. |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5628302A true JPS5628302A (en) | 1981-03-19 |
JPS595163B2 JPS595163B2 (en) | 1984-02-03 |
Family
ID=14369759
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10402779A Expired JPS595163B2 (en) | 1979-08-17 | 1979-08-17 | Speed control circuit for cranes, etc. |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS595163B2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5886902U (en) * | 1981-12-07 | 1983-06-13 | 株式会社クボタ | Drive device for fluid pressure cylinder |
JPS6120901U (en) * | 1984-07-12 | 1986-02-06 | 住友重機械工業株式会社 | Pump control circuit for cranes, etc. |
JPS6120902U (en) * | 1984-07-12 | 1986-02-06 | 住友重機械工業株式会社 | Pump control circuit for cranes, etc. |
JPH06129405A (en) * | 1993-02-18 | 1994-05-10 | Yutani Heavy Ind Ltd | Variable method for actuator relative speed |
CN102192204A (en) * | 2011-03-29 | 2011-09-21 | 宋建安 | Hydraulic speed control system |
CN102674157A (en) * | 2012-05-22 | 2012-09-19 | 徐州重型机械有限公司 | Low-speed rotary control method and system for cranes |
CN104071709A (en) * | 2014-07-18 | 2014-10-01 | 徐州重型机械有限公司 | Fixed fly jib stepless amplitude-variation control system for crane and crane |
-
1979
- 1979-08-17 JP JP10402779A patent/JPS595163B2/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5886902U (en) * | 1981-12-07 | 1983-06-13 | 株式会社クボタ | Drive device for fluid pressure cylinder |
JPH0131762Y2 (en) * | 1981-12-07 | 1989-09-29 | ||
JPS6120901U (en) * | 1984-07-12 | 1986-02-06 | 住友重機械工業株式会社 | Pump control circuit for cranes, etc. |
JPS6120902U (en) * | 1984-07-12 | 1986-02-06 | 住友重機械工業株式会社 | Pump control circuit for cranes, etc. |
JPH06129405A (en) * | 1993-02-18 | 1994-05-10 | Yutani Heavy Ind Ltd | Variable method for actuator relative speed |
CN102192204A (en) * | 2011-03-29 | 2011-09-21 | 宋建安 | Hydraulic speed control system |
CN102674157A (en) * | 2012-05-22 | 2012-09-19 | 徐州重型机械有限公司 | Low-speed rotary control method and system for cranes |
CN104071709A (en) * | 2014-07-18 | 2014-10-01 | 徐州重型机械有限公司 | Fixed fly jib stepless amplitude-variation control system for crane and crane |
Also Published As
Publication number | Publication date |
---|---|
JPS595163B2 (en) | 1984-02-03 |
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