| 摘要 |
PURPOSE:To reduce a start shock so as to shorten a time for starting an elevator, when it is lifted, by detecting a pressure before and after a check valve, at the time of lift-starting the hydraulic elevator, and increasing an amount of oil to an upward flow regulating valve when a differential pressure is larger than a fixed value. CONSTITUTION:In a differential pressure detecting means 26, a differential pressure P2-P1 is obtained and output to a start flow amount pattern generating means 27 based on the primary side pressure P1 detected by the first oil pressure detecting means 15 and a secondary side pressure P2 detected by the second oil pressure detecting means 16. Next, in the case of the differential pressure P2-P1 in a positive value, a delivery pressure of an oil hydraulic pump 2 is placed in a condition of pressure rising section where the delivery pressure reaches not a pressure possible to support weight of an elevator riding cage 7. Here for shortening the pressure rising interval, a start flow amount is generated and output in the start flow amount pattern generating means 27. A car start time can be shortened by thus setting the start flow amount to a large value, and further a start shock can be low held similarly to that in the past. |
