CN-121974265-A - Multi-point hydraulic synchronous jacking system

CN121974265ACN 121974265 ACN121974265 ACN 121974265ACN-121974265-A

Abstract

The embodiment of the application provides a multi-point hydraulic synchronous jacking system. The multi-point hydraulic synchronous lifting system comprises a plurality of hydraulic jacks, servo oil pumps respectively connected with the hydraulic jacks and a PLC controller, wherein each hydraulic jack is respectively provided with a displacement sensor for monitoring the actual lifting displacement of the corresponding hydraulic jack in real time, the PLC controller is in communication connection with each displacement sensor and each servo oil pump and is used for controlling the output flow of the corresponding servo oil pump according to the obtained actual lifting displacement of the hydraulic jack monitored by each displacement sensor in real time, so that the lifting rate of the hydraulic jack is accurately controlled, the lifting rate of each jack is accurately controlled in a mode, the synchronous error among the lifting rates of the hydraulic jacks is reduced, and the synchronous precision demanding scene in the scenes such as overhaul of the top cover of a hydropower station unit is met.

Inventors

QIN YAN
HU QINBO
XIE FEI
LI QUAN
WANG XIN
WANG ZHIJUN
WANG JIAJIA
YANG LI

Assignees

湖北清江水电开发有限责任公司

Dates

Publication Date: 20260505
Application Date: 20260325

Claims (9)

1. The utility model provides a synchronous jacking system of multiple spot position hydraulic pressure, its characterized in that includes a plurality of hydraulic jack, connects each hydraulic jack's servo oil pump and PLC controller respectively, wherein: each hydraulic jack is respectively provided with a displacement sensor for monitoring the actual lifting displacement of the corresponding hydraulic jack in real time; the PLC is in communication connection with each displacement sensor and each servo oil pump, and is used for controlling the output flow of the corresponding servo oil pump according to the actual lifting displacement of the hydraulic jack obtained by real-time monitoring of each displacement sensor.
2. The multi-point hydraulic synchronous jacking system according to claim 1, wherein the PLC controller determines the output flow rate of each servo oil pump according to the following manner, respectively: acquiring actual lifting displacement and preset target displacement of a hydraulic jack corresponding to the servo oil pump; calculating a displacement error according to the actual jacking displacement and the preset target displacement; And determining the output flow of the servo oil pump through an adaptive PID algorithm based on the displacement error.
3. The multi-point hydraulic synchronous jacking system of claim 2, wherein determining the output flow of the servo oil pump by an adaptive PID algorithm based on the displacement error, specifically comprises calculating the output flow of the servo oil pump by the following formula: ; Wherein, the Calculating the output flow of the servo oil pump; T is a time variable in the self-adaptive PID algorithm; Integrating variables in the adaptive PID algorithm; A scaling factor in the adaptive PID algorithm; Integrating coefficients in the adaptive PID algorithm; Differential coefficients in the adaptive PID algorithm; is the historical sum of errors over time t; is the instantaneous rate of change of the error.
4. The multi-point hydraulic synchronization jacking system of claim 3 wherein said PLC controller is further configured to optimize said scaling factor on-line based on historical operating data The integral coefficient And the differential coefficient To adapt to different jacking phases and loading conditions.
5. The multi-point hydraulic synchronous jacking system of claim 1, further comprising a pressure sensor for monitoring in real time the actual load pressure of each hydraulic jack and an inclinometer for monitoring in real time the overall actual inclination of the object being jacked, and The PLC is also in communication connection with the pressure sensor and the inclinometer, and is used for correspondingly controlling the output flow of each servo oil pump through a compound control algorithm based on the actual jacking displacement and the actual load pressure of each hydraulic jack and the overall actual inclination angle of the jacked object.
6. The multi-point hydraulic synchronous jacking system according to claim 5, wherein the PLC controller correspondingly controls the output flow rate of each servo oil pump by the following composite control algorithm: calculating displacement errors, pressure errors and inclination errors according to the actual jacking displacement, the actual load pressure and the overall actual inclination angle; the displacement error is used as a control main variable, and the basic output flow of the servo oil pump is determined through a self-adaptive PID algorithm; dynamically correcting the basic instruction by taking the pressure error and the inclination angle error as compensation variables, wherein when the pressure error exceeds a pressure error setting range, pressure equalization control is started to generate a first compensation flow to compensate the basic output flow; and when the inclination angle error exceeds the inclination angle error setting range, starting proportional slope adjustment control to generate a second compensation flow to compensate the basic output flow.
7. The multi-point hydraulic synchronous jacking system according to claim 1, wherein each hydraulic jack is provided with a corresponding mechanical self-locking device, and the mechanical self-locking device comprises a follow-up supporting mechanism driven by an air motor and is used for triggering mechanical locking when detecting that the sliding speed of a piston rod of the corresponding hydraulic jack exceeds a preset speed.
8. The multi-point hydraulic synchronous jacking system according to claim 1, further comprising a wireless communication module and a cloud platform, wherein the PLC is further used for transmitting the actual jacking displacement of each hydraulic jack and the output flow of each servo oil pump to the cloud platform through the wireless communication module.
9. The multi-point hydraulic synchronization jacking system of claim 1, further comprising a human-machine interaction system comprising: The portable control box is provided with a touch display screen and control buttons; the wireless remote controller is in wireless connection with the portable control box; The PLC is in communication connection with the portable control box and the wireless remote controller and is used for receiving the operation instruction and displaying the running state of the system.

Description

Multi-point hydraulic synchronous jacking system Technical Field The application relates to the technical field of hydraulic jacks, in particular to a multi-point hydraulic synchronous jacking system. Background The multi-point hydraulic synchronous jacking technology is a key technology in the field of modern engineering, is widely applied to the scenes such as bridge construction, building structure displacement, hydropower station unit maintenance and the like, and is especially indispensable in hydropower station unit top cover maintenance operation, wherein the top cover is used as a core overcurrent component of a hydroelectric generating set and bears huge water pressure and mechanical vibration, the top cover needs to be safely and stably jacked up during maintenance, and the hydropower station unit has small installation space, large top cover jacking force requirement and long stroke, and extremely high requirements are put forward on the precision and stability of the synchronous jacking technology. At present, a flow control type synchronous jacking technology based on a distribution valve is generally adopted in the industry, and the realization mode is that hydraulic oil output by a hydraulic pump is distributed to all jacking jacks according to a preset proportion through the hydraulic distribution valve, so that the synchronization of multipoint jacking actions is indirectly realized by means of the consistency of flow distribution. However, the prior art has the core technical problems that the synchronous is controlled indirectly only through flow distribution, the influence of actual working condition factors such as load fluctuation, pipeline resistance difference, equipment abrasion and the like in the jacking process on the flow distribution precision is not considered, so that the synchronous error of the jacking speed of each jack is larger, and the severe requirement on the synchronous precision in the scenes such as overhaul of the top cover of a hydropower station unit cannot be met. Disclosure of Invention The embodiment of the application aims to provide a multi-point hydraulic synchronous lifting system, which aims to solve the problem of large lifting speed synchronization error of each jack in the multi-point hydraulic synchronous lifting technology in the prior art. In order to solve the technical problems, the embodiment of the application provides a multi-point hydraulic synchronous jacking system, which comprises a plurality of hydraulic jacks, a servo oil pump and a PLC (programmable logic controller) controller, wherein the servo oil pump is respectively connected with each hydraulic jack, and the PLC controller comprises: each hydraulic jack is respectively provided with a displacement sensor for monitoring the actual lifting displacement of the corresponding hydraulic jack in real time; the PLC is in communication connection with each displacement sensor and each servo oil pump, and is used for controlling the output flow of the corresponding servo oil pump according to the actual lifting displacement of the hydraulic jack obtained by real-time monitoring of each displacement sensor. Preferably, the PLC controller determines the output flow rate of each of the servo oil pumps according to the following manner: acquiring actual lifting displacement and preset target displacement of a hydraulic jack corresponding to the servo oil pump; calculating a displacement error according to the actual jacking displacement and the preset target displacement; And determining the output flow of the servo oil pump through an adaptive PID algorithm based on the displacement error. Preferably, the output flow rate of the servo oil pump is determined by an adaptive PID algorithm based on the displacement error, specifically including calculating the output flow rate of the servo oil pump by the following formula: ; Wherein, the Calculating the output flow of the servo oil pump; T is a time variable in the self-adaptive PID algorithm; Integrating variables in the adaptive PID algorithm; A scaling factor in the adaptive PID algorithm; Integrating coefficients in the adaptive PID algorithm; Differential coefficients in the adaptive PID algorithm; is the historical sum of errors over time t; is the instantaneous rate of change of the error. Preferably, the PLC is further configured to optimize the scaling factor on-line based on historical operating dataThe integral coefficientAnd the differential coefficientTo adapt to different jacking phases and loading conditions. Preferably, the system further comprises a pressure sensor and an inclinometer, wherein the pressure sensor is used for monitoring the actual load pressure of each hydraulic jack in real time, the inclinometer is used for monitoring the overall actual inclination angle of the lifted object in real time, and the inclinometer is used for monitoring the overall actual inclination angle of the lifted object in real time The