CN116517897A - Hydraulic system applied to tower crane and control method thereof - Google Patents
Hydraulic system applied to tower crane and control method thereof Download PDFInfo
- Publication number
- CN116517897A CN116517897A CN202310631431.7A CN202310631431A CN116517897A CN 116517897 A CN116517897 A CN 116517897A CN 202310631431 A CN202310631431 A CN 202310631431A CN 116517897 A CN116517897 A CN 116517897A
- Authority
- CN
- China
- Prior art keywords
- pressure
- valve
- hydraulic
- oil
- hydraulic system
- 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
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000003921 oil Substances 0.000 claims abstract description 36
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 claims description 2
- 230000008602 contraction Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/20—Control systems or devices for non-electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/26—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail
- B66C23/28—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes for use on building sites; constructed, e.g. with separable parts, to facilitate rapid assembly or dismantling, for operation at successively higher levels, for transport by road or rail constructed to operate at successively higher levels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
本发明公开了一种应用于塔机的液压系统，包括液压泵；所述液压泵的出口连通用于调节液压油压力的比例溢流阀，比例溢流阀的输出端连通先导减压阀，先导减压阀连接主控阀为其传递信号，主控阀的输出端通过液压软管与顶升油缸连通构成活塞杆伸出以及收缩的油路。本发明还公开了上述应用于塔机的液压系统的控制方法，通过控制模块调控先导减压阀，实现主阀的调控。本发明在现有液压系统的基础上增加比例溢流阀，就可实现系统的无极调压功能，操作简单方便；增加先导减压阀，实现液压系统的保压功能；同时，将比例溢流阀与先导减压阀联合控制调压保压回路，使系统电控对应电流范围大，电控系统压力调节方便。
The invention discloses a hydraulic system applied to tower cranes, which includes a hydraulic pump; the outlet of the hydraulic pump is connected to a proportional overflow valve for adjusting hydraulic oil pressure, and the output end of the proportional overflow valve is connected to a pilot pressure reducing valve. The pilot pressure reducing valve is connected to the main control valve to transmit signals to it, and the output end of the main control valve is connected with the jacking cylinder through a hydraulic hose to form an oil circuit for the extension and contraction of the piston rod. The invention also discloses the above-mentioned control method applied to the hydraulic system of the tower crane, which realizes the control of the main valve by regulating the pilot pressure reducing valve through the control module. The invention adds a proportional overflow valve on the basis of the existing hydraulic system to realize the stepless pressure regulation function of the system, which is simple and convenient to operate; adds a pilot pressure reducing valve to realize the pressure maintaining function of the hydraulic system; at the same time, the proportional overflow The valve and the pilot pressure reducing valve jointly control the pressure regulating and maintaining circuit, so that the electric control of the system corresponds to a large current range, and the pressure adjustment of the electric control system is convenient.
Description
技术领域technical field
本发明属于液压系统技术领域，尤其是涉及一种应用于塔机的液压系统及其控制方法。The invention belongs to the technical field of hydraulic systems, and in particular relates to a hydraulic system applied to tower cranes and a control method thereof.
背景技术Background technique
塔机液压系统通常在起升机构与变幅机构的液压夹钳、顶升机构以及调平机构中。起升机构与变幅机构中的液压夹钳为塔机吊载与小车作业幅度提供夹紧阻尼力。顶升机构与调平机构的液压系统为塔机自升标准节和底架调平提供顶升支承力。但塔机安装作业过程中存在着上部重量变动的工况，不同的液压系统压力使油缸提供不同的顶升支承力。The tower crane hydraulic system is usually in the hydraulic clamps of the hoisting mechanism and the luffing mechanism, the jacking mechanism and the leveling mechanism. The hydraulic clamps in the hoisting mechanism and the luffing mechanism provide clamping and damping force for the hoisting of the tower crane and the operating range of the trolley. The hydraulic system of the jacking mechanism and leveling mechanism provides jacking support for the self-elevating standard section of the tower crane and the leveling of the underframe. However, during the tower crane installation process, there are working conditions in which the weight of the upper part changes, and different hydraulic system pressures make the oil cylinders provide different jacking support forces.
现有技术中的塔机顶升机构与调平机构往往采用液压系统及油缸的机构形式，如图1所示，当塔机起重臂、配重等结构未全部安装完毕时，及上部重量未达到预先设定的重量时，此时顶升机构提供的压力会导致油缸提供过多的顶升支撑力。同理塔机各标准节与上部重量未全部安装完毕时，及塔机整机重量未达到预先设定重量时，此时调平机构为调平油缸提供的顶升支持力将远大于塔机所需要的顶升力；在这种情况下，塔机依靠销轴强行支承起油缸多余顶升支承力的负载，液压系统也受到油缸系统压力与油标提供压力不符的影响，此时油缸会出现抖动的现象；销轴承受多余的负载，同时影响顶升调平与底架调平的油缸定位工作精度，增加顶升与调平工作中的危险；其次现有液压系统的调压和保压回路比较复杂，元件数量多，操作复杂。The jacking mechanism and leveling mechanism of the tower crane in the prior art often adopt the mechanism form of the hydraulic system and the oil cylinder, as shown in Fig. When the preset weight is not reached, the pressure provided by the jacking mechanism will cause the oil cylinder to provide too much jacking support force. Similarly, when all the standard sections and upper parts of the tower crane are not fully installed, and the weight of the whole tower crane does not reach the preset weight, the jacking support force provided by the leveling mechanism for the leveling cylinder will be much greater than that of the tower crane. The required jacking force; in this case, the tower crane relies on the pin shaft to forcibly support the load of the excess jacking support force of the oil cylinder, and the hydraulic system is also affected by the discrepancy between the pressure of the oil cylinder system and the pressure provided by the oil standard. At this time, the oil cylinder will appear The phenomenon of shaking; the pin bearing is subject to excess load, which affects the positioning accuracy of the oil cylinder for jacking and leveling and underframe leveling, and increases the danger in jacking and leveling work; secondly, the pressure regulation and pressure maintenance of the existing hydraulic system The circuit is relatively complicated, the number of components is large, and the operation is complicated.
发明内容Contents of the invention
发明目的：本发明目的旨在提供一种操控简单、控制精准的应用于塔机的液压系统；本发明另一目的旨在提供上述应用于塔机的液压系统的控制方法。Object of the invention: The object of the present invention is to provide a hydraulic system applied to a tower crane with simple operation and precise control; another object of the present invention is to provide the above-mentioned control method for a hydraulic system applied to a tower crane.
技术方案：本发明所述的应用于塔机的液压系统，包括液压泵；所述液压泵的出口连通用于调节液压油压力的比例溢流阀，比例溢流阀的输出端连通先导减压阀，先导减压阀连接主控阀为其传递信号，主控阀的输出端通过液压软管与顶升油缸连通构成活塞杆伸出以及收缩的油路。Technical solution: The hydraulic system applied to tower cranes according to the present invention includes a hydraulic pump; the outlet of the hydraulic pump is connected to a proportional overflow valve for adjusting the hydraulic oil pressure, and the output end of the proportional overflow valve is connected to a pilot decompression The pilot pressure reducing valve is connected to the main control valve to transmit signals for it, and the output end of the main control valve is connected with the jacking cylinder through a hydraulic hose to form an oil circuit for the extension and contraction of the piston rod.
其中，还包括电控模块，顶升油缸内设有压力传感器，电控模块与压力传感器连接，并将通过与先导减压阀连接为之传递信号。Among them, it also includes an electric control module, a pressure sensor is arranged in the jacking oil cylinder, the electric control module is connected with the pressure sensor, and will transmit signals to it by connecting with the pilot pressure reducing valve.
其中，所述活塞杆伸出的油路包括：液压泵工作将液压油经比例溢流阀的压力调节后，先后经过先导减压阀和主控阀左位、到顶升油缸的大腔，回油路径为顶升油缸的小腔经主控阀左位到回油箱。Wherein, the oil circuit through which the piston rod protrudes includes: the hydraulic pump works to adjust the pressure of the hydraulic oil through the proportional overflow valve, then passes through the pilot pressure reducing valve and the left position of the main control valve, to the large cavity of the jacking cylinder, and returns to The oil path is from the small cavity of the jacking oil cylinder to the oil return tank through the left position of the main control valve.
其中，所述活塞杆缩回的油路包括：液压泵工作将液压油经先导减压阀的右位、主控阀右位、液压软管左位到顶升油缸的小腔。Wherein, the oil circuit for the retraction of the piston rod includes: the hydraulic pump works to transfer the hydraulic oil through the right position of the pilot pressure reducing valve, the right position of the main control valve, and the left position of the hydraulic hose to the small chamber of the jacking cylinder.
其中，还包括设置于油箱上的空气滤清器和同液位液温计。Among them, it also includes an air filter and a liquid temperature gauge arranged on the fuel tank.
其中，所述先导减压阀的工作电流为380mA。Wherein, the operating current of the pilot pressure reducing valve is 380mA.
其中，所述比例溢流阀输出油口压力与负载压力之间的关系为：Pa＝Pls+A，其中Pa为比例溢流阀输出油口压力，Pls为负载压力，A为做工压力，A取值为0.8～1MPa。Wherein, the relationship between the pressure at the output port of the proportional relief valve and the load pressure is: Pa=Pls+A, where Pa is the pressure at the output port of the proportional relief valve, Pls is the load pressure, A is the working pressure, and A The value is 0.8~1MPa.
上述应用于塔机的液压系统的控制方法，包括以下步骤：The above-mentioned control method applied to the hydraulic system of the tower crane includes the following steps:
步骤1、当塔机需要进行工作时，液压系统开始工作，通过比例溢流阀进行液压油油压的调节，保证顶升油缸的活塞杆运动到指定位置：Step 1. When the tower crane needs to work, the hydraulic system starts to work, and the hydraulic oil pressure is adjusted through the proportional relief valve to ensure that the piston rod of the jacking cylinder moves to the designated position:
步骤2、通过压力传感器检测顶升油缸内的压力值是否到达负载的压力值范围，若到达该范围则顶升油缸保持压力，若未到达则顶升油缸补油增压继续工作；Step 2. Use the pressure sensor to detect whether the pressure value in the jacking cylinder has reached the pressure value range of the load. If it reaches the range, the jacking cylinder will maintain the pressure. If it does not reach the pressure, the jacking cylinder will continue to work;
步骤3、步骤2中，若压力传感器检测的压力值到达负载的压力值范围，则控制模块向先导减压阀输出0mA的电流，此时主控阀回到中位；若压力传感器检测的压力值未到达负载的压力值范围，则则控制模块向先导减压阀输出380mA的电流，此时主控阀向中顶升油缸进行补油，直到达到到达负载的压力值范围，然后回到中位。In step 3 and step 2, if the pressure value detected by the pressure sensor reaches the pressure value range of the load, the control module outputs a current of 0 mA to the pilot pressure reducing valve, and the main control valve returns to the neutral position at this time; if the pressure detected by the pressure sensor If the value does not reach the pressure value range of the load, the control module outputs 380mA current to the pilot pressure reducing valve. At this time, the main control valve supplies oil to the middle jacking cylinder until it reaches the pressure value range of the load, and then returns to the middle. bit.
有益效果：与现有技术相比，本发明具有以下显著的进步：Beneficial effect: compared with the prior art, the present invention has the following remarkable progress:
(1)本发明在现有液压系统的基础上设置比例溢流阀和先导减压阀，通过比例溢流阀控制调压后的活塞杆伸出和回缩到指定位置时，主控阀回到中位，从而实现整个系统的无极调压，减少调压在操作上的复杂程度；通过控制先导比例阀的输出电流，使得主控阀进入自动保压工况，在此工况中液压泵只提供补充系统内泄漏的流量，保证主阀回到中位，同时不会给销轴施加过大的负载，当负载变大时通过控制比例阀的输出电流启动主控阀，实现补油保压；(1) The present invention sets a proportional overflow valve and a pilot pressure reducing valve on the basis of the existing hydraulic system. When the piston rod after pressure regulation is controlled by the proportional overflow valve to stretch out and retract to the specified position, the main control valve returns to the specified position. To the middle position, so as to realize the stepless pressure regulation of the whole system and reduce the complexity of the operation of pressure regulation; by controlling the output current of the pilot proportional valve, the main control valve enters the automatic pressure maintaining condition. In this condition, the hydraulic pump Only provide the leakage flow in the supplementary system to ensure that the main valve returns to the neutral position without imposing excessive load on the pin shaft. When the load becomes large, the main control valve is activated by controlling the output current of the proportional valve to realize oil replenishment protection. pressure;
(2)本发明针对顶升与调平工作过程中负载变化的问题，通过设置压力传感器检测油缸在工作过程中的压力值是否到达设置范围，对其进行保压或补油的操作，在保证正常顶升或调平工作的前提下，减小过大的液压对销轴的损耗，同时整个控制过程简单易操作，提高了顶升或调平的精度。(2) The present invention aims at the problem of load change in the process of jacking up and leveling, by setting a pressure sensor to detect whether the pressure value of the oil cylinder reaches the setting range during the working process, and performing pressure maintaining or oil replenishing operations on it to ensure Under the premise of normal jacking or leveling work, the loss of excessive hydraulic pressure to the pin shaft is reduced, and the entire control process is simple and easy to operate, which improves the precision of jacking or leveling.
附图说明Description of drawings
图1为现有技术中的液压系统的原理图；Fig. 1 is the schematic diagram of the hydraulic system in the prior art;
图2为本发明的液压系统原理图；Fig. 2 is a schematic diagram of the hydraulic system of the present invention;
图3为本发明的控制的流程图。Fig. 3 is a flowchart of the control of the present invention.
具体实施方式Detailed ways
实施例1Example 1
如图1～2所示，本发明应用于塔机的液压系统，包括液压泵2；液压泵2的出口连通用于调节液压油压力的比例溢流阀10，比例溢流阀10的输出端连通先导减压阀5，先导减压阀5连接主控阀8为其传递信号，主控阀8的输出端通过液压软管7与顶升油缸9连通构成活塞杆伸出以及收缩的油路。液压系统还包括电控模块，顶升油缸9内设有压力传感器，电控模块与压力传感器连接，并将通过与先导减压阀5连接为之传递信号。As shown in Figures 1 to 2, the present invention is applied to the hydraulic system of tower cranes, including a hydraulic pump 2; the outlet of the hydraulic pump 2 is connected to a proportional overflow valve 10 for adjusting hydraulic oil pressure, and the output end of the proportional overflow valve 10 Connected to the pilot pressure reducing valve 5, the pilot pressure reducing valve 5 is connected to the main control valve 8 to transmit signals for it, and the output end of the main control valve 8 communicates with the jacking cylinder 9 through the hydraulic hose 7 to form the oil circuit for the extension and contraction of the piston rod . The hydraulic system also includes an electronic control module. A pressure sensor is provided in the jacking cylinder 9 . The electronic control module is connected to the pressure sensor and will transmit signals to it by connecting with the pilot pressure reducing valve 5 .
其中用于活塞杆伸出的油路包括：液压泵2工作将液压油经比例溢流阀10的压力调节后，先后经过先导减压阀5和主控阀8左位到达顶升油缸9的大腔，回油路径为顶升油缸9的小腔经主控阀8左位到回油箱。The oil circuit for piston rod extension includes: the hydraulic pump 2 works to adjust the pressure of the hydraulic oil through the proportional relief valve 10, and then passes through the pilot pressure reducing valve 5 and the left position of the main control valve 8 to reach the jacking cylinder 9. Large chamber, the oil return path is the small chamber of the jacking cylinder 9 to the oil return tank through the left position of the main control valve 8.
用于活塞杆缩回的油路包括：液压泵2工作将液压油经先导减压阀5的右位、主控阀8右位、液压软管7左位到达顶升油缸9的小腔。The oil circuit for the retraction of the piston rod includes: the hydraulic pump 2 works to transfer the hydraulic oil to the small cavity of the jacking cylinder 9 through the right position of the pilot pressure reducing valve 5, the right position of the main control valve 8, and the left position of the hydraulic hose 7.
液压系统还包括设置于油箱上的空气滤清器1和同液位液温计4。先导减压阀5的工作电流为380mA。在本实施例中，比例溢流阀10输出油口压力与负载压力之间的关系为：Pa＝Pls+A，其中Pa为比例溢流阀10输出油口压力，Pls为负载压力，A为做工压力，A取值为0.8～1MPa。The hydraulic system also includes an air filter 1 and a liquid temperature gauge 4 arranged on the oil tank. The operating current of the pilot pressure reducing valve 5 is 380mA. In this embodiment, the relationship between the pressure at the output port of the proportional relief valve 10 and the load pressure is: Pa=Pls+A, where Pa is the pressure at the output port of the proportional relief valve 10, Pls is the load pressure, and A is Working pressure, the value of A is 0.8~1MPa.
实施例2Example 2
为解决当活塞杆到达指定位置后的保压问题，本实施例对两个工况分开说明；包括工况1：塔机开始进行顶升或调平工况时，液压系统启动，依据上部重量调节比例溢流阀10对系统压力进行标定，使系统压力提供的油缸顶升支承力满足当前上部重量需求。当塔机顶升的顶升油缸或者调平油缸运行到在指定位置时，主控阀8回到中位；顶升油缸9腔内内压力传感器检测系统压力，当检测到油缸压力低于设定值时，通过控制模块提醒驾驶员油缸位置。通过控制模块采集上述信号并进行逻辑判断，如果上述情况反馈数据低于设定值，控制模块发出信号，向先导比例减压阀5输出380mA电流，主控阀8进入自动保压工况，并只提供补充系统内泄漏的流量。In order to solve the problem of maintaining pressure when the piston rod reaches the designated position, this embodiment describes the two working conditions separately; including working condition 1: when the tower crane starts to lift or level the working condition, the hydraulic system starts, and the weight of the upper part Adjust the proportional relief valve 10 to calibrate the system pressure, so that the cylinder jacking support force provided by the system pressure meets the current upper weight requirement. When the jacking cylinder or leveling cylinder of the tower crane moves to the specified position, the main control valve 8 returns to the neutral position; the pressure sensor in the cavity of the jacking cylinder 9 detects the system pressure, and when it detects that the cylinder pressure is lower than the set When the value is set, the driver is reminded of the oil cylinder position through the control module. The above signal is collected by the control module and logically judged. If the feedback data of the above situation is lower than the set value, the control module sends a signal to output 380mA current to the pilot proportional pressure reducing valve 5, and the main control valve 8 enters the automatic pressure maintaining condition, and Only provide flow to make up for leaks in the system.
工况2：当塔机顶升的顶升油缸或者调平油缸运行到在指定位置时，主控阀回到中位8；顶升油缸9腔内内压力传感器检测系统压力，当检测到油缸压力满足设定值时，控制模块控制先导比例减压阀5的输入电流为，此时主阀回中位，系统待命；当顶升油缸9腔内压力小于指定值时，控制模块控制主控阀8重新启动，自动进行补油保压；达到指定值后，主泵主控阀8回中再次进入自动保压工况，并只提供补充系统内泄漏的流量。Working condition 2: When the jacking cylinder or leveling cylinder of the tower crane is running to the specified position, the main control valve returns to the neutral position 8; the pressure sensor in the 9 cavity of the jacking cylinder detects the system pressure. When the pressure meets the set value, the control module controls the input current of the pilot proportional pressure reducing valve 5. At this time, the main valve returns to the neutral position and the system is on standby; when the pressure in the jacking cylinder 9 cavity is lower than the specified value, the control module controls the main Valve 8 restarts to automatically replenish oil and maintain pressure; after reaching the specified value, the main control valve 8 of the main pump enters the automatic pressure maintaining condition again, and only provides the flow that supplements the leakage in the system.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631431.7A CN116517897A (en) | 2023-05-31 | 2023-05-31 | Hydraulic system applied to tower crane and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310631431.7A CN116517897A (en) | 2023-05-31 | 2023-05-31 | Hydraulic system applied to tower crane and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116517897A true CN116517897A (en) | 2023-08-01 |
Family
ID=87408365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310631431.7A Pending CN116517897A (en) | 2023-05-31 | 2023-05-31 | Hydraulic system applied to tower crane and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116517897A (en) |
-
2023
- 2023-05-31 CN CN202310631431.7A patent/CN116517897A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206845568U (en) | One kind control two-tank method action hydraulic system | |
| RU2423313C1 (en) | Device and method for compensation of hydraulic system working fluid thermal compression | |
| CN103591075B (en) | Hydraulic control system synchronous with crane and balancing weight hydraulic cylinder | |
| CN103569882A (en) | Hydraulic jacking system of attached tower crane | |
| KR20120098788A (en) | Out-of-range sensor recalibration | |
| CN110217737B (en) | Aerial work platform control valve working condition-division follow-up system and control method | |
| CN104879335A (en) | Synchronous control system and control method for multiple hydraulic cylinders | |
| CN108757593A (en) | A kind of torsion shaft tooth root finish rolling hardening lathe hydraulic oil supply system | |
| CN103057160A (en) | Riveting equipment control system | |
| CN107725510B (en) | Leveling control oil circuit for synchronously driving small crane supporting legs | |
| CN108194457B (en) | Hydraulic jacking system and tower crane | |
| CN210889519U (en) | Tower crane lifting hydraulic system | |
| CN104100590A (en) | Jacking hydraulic system and jacking and back-jacking methods thereof | |
| CN116517897A (en) | Hydraulic system applied to tower crane and control method thereof | |
| CN103603841A (en) | Leveling oil cylinder hydraulic control system and fire engine | |
| CN102953550B (en) | Manual-automatic integrated tensioning system | |
| CN115231485A (en) | Leveling hydraulic control system and aerial work platform | |
| CN202718397U (en) | Prestress automatic tensioning system | |
| CN113757200B (en) | Hydraulic system, engineering machinery and control method of hydraulic system | |
| CN210946937U (en) | Energy-saving control system of excavator | |
| KR101316885B1 (en) | Basket leveling apparatus for maintaining precise horizontality | |
| CN204436958U (en) | A kind of three-dimensional loads hydraulic pressure installation | |
| US20240043250A1 (en) | Lifting gear, and method for adjusting the boom of such a lifting gear | |
| CN218560933U (en) | A hydraulic jacking system for a tower crane | |
| RU2840994C2 (en) | Lowering hydraulic control method, lowering hydraulic control system and engineering equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |