WO2020082691A1 - 一种双缸液压顶出控制系统及其方法 - Google Patents

一种双缸液压顶出控制系统及其方法 Download PDF

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Publication number
WO2020082691A1
WO2020082691A1 PCT/CN2019/080731 CN2019080731W WO2020082691A1 WO 2020082691 A1 WO2020082691 A1 WO 2020082691A1 CN 2019080731 W CN2019080731 W CN 2019080731W WO 2020082691 A1 WO2020082691 A1 WO 2020082691A1
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cylinder
motor
control unit
control
solenoid valve
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PCT/CN2019/080731
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English (en)
French (fr)
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徐丽
周锋
陈晖�
董晓鹏
夏璐
丁义
霍孟友
张小俊
孙凌宇
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扬力集团股份有限公司
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Publication of WO2020082691A1 publication Critical patent/WO2020082691A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/16—Control arrangements for fluid-driven presses
    • B30B15/166—Electrical control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/26—Programme control arrangements

Definitions

  • the invention relates to a press, in particular to a double-cylinder press.
  • the double-cylinder press manually controls the start and stop of the motor, and manually controls the connection and disconnection of the solenoid valve. This operation is easy to confuse the working state with the maintenance state, resulting in abnormal oil circuit work, inconvenient maintenance, and no oil circuit alarm detection.
  • the double-cylinder press includes an upper cylinder and a lower cylinder. The upper and lower cylinders are filled with oil into the two fuel tanks through the upper-cylinder motor and the lower-cylinder motor, respectively, and the upper and lower cylinders are controlled to eject to adapt to the processing of different workpieces.
  • the purpose of the present invention is to provide a dual-cylinder hydraulic ejection control system and method, which can not only satisfy the full-time real-time control and pre-control function of the hydraulic circuit, but also communicate with the press in real time to realize intelligent industrial production;
  • the workpiece is formed at one time, no subsequent process is required, and the utilization rate of workshop equipment is improved.
  • a double-cylinder hydraulic ejection control method including the following steps:
  • Upstroke adjustment when the detection unit detects the upstroke of the press slider, it is sent to the control unit, and the control unit outputs a control signal to adjust the oil pressure in the oil pressure in the upper and lower cylinder tanks through the action unit , The rough rate determines the ejection position of the upper and lower cylinders;
  • a pressure adjustment step is further included between step 1) and step 2), a signal is input to the control unit, and the hydraulic pressure difference of the upper cylinder oil tank and the lower cylinder oil tank is adjusted by the action unit respectively.
  • it can adapt to the processing of workpieces of different specifications.
  • step 1) to step 5 when the hydraulic pressure ejects the upper cylinder and the lower cylinder and fails, input a signal to the control unit, and perform unloading processing on the upper cylinder oil tank and the lower cylinder oil tank through the action unit . In order to make maintenance more convenient.
  • control unit is selected from PLC;
  • detection unit includes an angle detection sensor connected to the rotating shaft of the press and a trigger switch matched therewith, and the trigger switch is connected to the PLC;
  • action unit includes AC contact
  • the solenoid valve, the AC contactor are used to control the upper cylinder motor and the lower cylinder motor, and the solenoid valve is used to control the oil pressure in the upper cylinder oil tank and the lower cylinder oil tank;
  • the PLC is also connected with a touch screen for inputting signals.
  • step 3 during the downstroke holding pressure, the trigger position near the bottom dead center is 80% -90% of the total downward stroke.
  • a dual-cylinder hydraulic ejection control system includes a main circuit unit and a main control unit.
  • the main circuit unit includes an upper-cylinder motor and a lower-cylinder motor connected to a power source via an AC contactor contact.
  • the main control unit includes :
  • Control unit to control the working process of the press
  • the detection unit is used to detect the stroke state of the press slider and send it to the control unit;
  • the action unit is used to receive the control signal from the control unit, control the work of the upper cylinder motor and the lower cylinder motor through the AC contactor, and control the oil pressure in the upper cylinder oil tank and the lower cylinder oil tank through the solenoid valve.
  • the detection unit includes an angle detection sensor connected to the rotating shaft of the press and a trigger switch matched therewith, and the trigger switch is connected to the input end of the control unit.
  • the action unit includes an AC contactor coil and a working solenoid valve;
  • the AC contactor coil includes an upper cylinder contactor coil KM1 that controls the operation of the upper cylinder motor and a lower cylinder contact that controls the operation of the lower cylinder motor Coil KM2
  • the working solenoid valve includes an upper cylinder working solenoid valve YV1 that controls the oil pressure in the upper cylinder and a lower cylinder working solenoid valve YV2 that controls the oil pressure in the lower cylinder.
  • the main circuit unit further includes a differential pressure motor and a cooling motor, the differential pressure motor and the cooling motor are connected to the power source through an AC contactor contact, and the action unit further includes a solenoid valve cooperating with the differential pressure motor And the AC contactor coil matched with the cooling motor.
  • a thermal relay is provided between the AC contactor contacts and the upper cylinder motor, lower cylinder motor, differential pressure motor, and cooling motor.
  • the invention can adapt to the forming of various specifications of workpieces, and set the precise adjustment of the oil pressure of the upper and lower cylinders according to the material thickness of the stamped workpiece;
  • the present invention has the functions of fine adjustment and coarse adjustment, greatly improves the processing rate of the workpiece, and ensures the forming effect of the stamping workpiece;
  • the hydraulic ejection control system has functions such as differential pressure adjustment and electric unloading, which is convenient for maintenance and reduces the difficulty of later maintenance.
  • FIG. 1 is a block diagram of the control principle of the present invention.
  • Fig. 2 is the principle wiring diagram of the system of the present invention.
  • a dual-cylinder hydraulic ejection control system as shown in Figure 1-2 includes:
  • Main circuit unit Three-phase 380V, 50Hz power supply is protected by air switch QF, and connected to the upper ends of four AC contactor contacts KM1-1, KM2-1, KM3-1, KM4-1, and AC contactor KM1-1 , KM2-1, KM3-1, KM4-1 are connected to the thermal relays FR1, FR2, FR3, FR4, through thermal relays FR1, FR2, FR3, FR4 overcurrent protection, and then connected to four motors, respectively Cylinder motor M1, upper cylinder motor M2, differential pressure motor M3, cooling motor M4;
  • Control circuit three-phase 380V, 50Hz power supply takes two-phase access to transformer TC, outputs AC220V AC control power, connects to PLC power terminal, presser angle, liquid level detection, loop blockage input signal leads to programmable controller input ;
  • the output end of the programmable controller passes through the AC contactor KM1-4 to the motor, the output end of the programmable controller to the solenoid valves YV1-YV6, and the RS485 communication module of the programmable controller to the connection interface.
  • a double-cylinder hydraulic ejection control method includes the following steps:
  • the press start signal SQ7 After the press start signal SQ7 is turned on, it is programmed by the programmable controller program, and the AC contactor KM1, AC contactor KM2 and AC contactor KM4 are connected; after KM1 is turned on, the lower cylinder motor M1 runs and the lower cylinder fuel tank There is pressure inside; after KM2 is turned on, the upper cylinder motor M2 runs and there is pressure in the upper cylinder oil tank; after KM4 is turned on, the cooling motor M4 runs and the grease cooling cycle starts.
  • the lower cylinder working solenoid valve YV1 and the upper cylinder working solenoid valve YV2 are energized to work; due to the operation of the lower cylinder motor M1 and the upper cylinder motor M2, there is oil pressure in the box, so the lower cylinder working solenoid valve YV1 and the upper cylinder working solenoid valve YV2 are connected After that, the lower cylinder and the upper cylinder are ejected by hydraulic pressure, and fine adjustment is performed again, and the cycle is repeated.
  • the control method of the present invention also has a pressure regulation mode, including lower and upper cylinder oil pressure settings and lower and upper oil pressure unloading; respectively:
  • Lower and upper cylinder oil pressure setting hydraulic ejection has two cylinders, which are divided into upper cylinder and lower cylinder. According to the needs of customers to process workpieces, it is necessary to adjust the hydraulic pressure of upper cylinder and lower cylinder separately;
  • the AC contactor KM3 is turned on; after KM3 is turned on, the pressure difference motor M3 runs, the oil pressure
  • the pressure in the adjustment circuit is adjusted through the manual valve and the pressure gauge respectively for the upper and lower cylinders.
  • Lower and upper oil pressure unloading When the hydraulic cylinder ejects the upper cylinder and the lower cylinder and fails, it is necessary to unload the hydraulic pressure of the upper cylinder and the lower cylinder to ensure that there is no pressure in the oil cylinder and the oil circuit during maintenance. First click on the "Manual Unload” button on the touch screen, and through the programmable controller program programming, the lower cylinder adjustment solenoid valve YV5 and the upper cylinder adjustment solenoid valve YV6 are connected, and the oil pressure in the oil cylinder and the oil circuit is discharged into the oil tank. Ensure that the maintenance work is carried out normally to avoid leakage of grease and protect the safety of the operator. When the maintenance is over, press the "Manual Unload” button in the touch screen, the lower cylinder adjustment solenoid valve YV5 and the upper cylinder adjustment solenoid valve YV6 are automatically disconnected.
  • Blockage of oil pressure circuit (SQ3, SQ4), there is a blockage alarm device in the circuit from the tank to the cylinder of the hydraulic station.
  • the blockage alarm device detection switch is turned on, and the collected signal is directed to the programmable controller input
  • the programmable controller program is programmed to maintain the signal without stopping all the motors of the hydraulic station. Only the alarm is displayed on the touch screen to prompt the operator to clean up, and then click the "Reset" button in the touch screen to remove the fault.
  • RS485 communication interface is reserved, and the press and the hydraulic station exchange data through the RS485 communication protocol.
  • the hydraulic station detects high liquid level, low liquid level, motor stop and other signals, it is transmitted to the press control programmable controller , To control the shutdown of the press, to avoid the work being scrapped due to the hydraulic station not working and the press pressing separately, which will increase the cost.

Abstract

一种双缸液压顶出控制系统，包括主电路单元和主控单元，所述主电路单元包括经交流接触器触头连接在电源上的上缸电机(M2)和下缸电机(M1)，所述主控单元包括：控制单元，用以控制压力机的工作过程；检测单元，用以检测压力机滑块行程状态，并将其发送给控制单元；动作单元，用以接收来自控制单元的控制信号，通过交流接触器控制上缸电机、下缸电机工作，通过电磁阀控制上缸油箱、下缸油箱内的油压。以及一种双缸液压顶出控制方法。上述控制系统能适应多种规格的工件成形，根据冲压工件的材料厚度，设置上、下缸油压的精准调节，可用于双缸压力机控制中。

Description

一种双缸液压顶出控制系统及其方法 技术领域
本发明涉及一种压力机，特别涉及一种双缸压力机。
背景技术
现有技术中双缸压力机手动控制电机启动与停止，手动控制电磁阀的接通与断开。此操作易将工作状态与检修状态混淆，导致油路工作不正常，检修不方便，无油路报警检测等。双缸压力机包括上缸与下缸，上缸和下缸分别通过上缸电机和下缸电机往两油箱内注油，控制上缸与下缸顶出，以适应不同工件的加工。
发明内容
本发明的目的是提供一种双缸液压顶出控制系统及其方法，既能够满足对于液压回路的全面实时掌控，提前预控功能，又能与压力机实时通讯，实现智能化工业生产；让工件一次成形，无需后续工序，提高车间设备的利用率。
本发明的目的是这样实现的：一种双缸液压顶出控制方法，包括以下步骤：
1)启动电机；当检测单元检测到启动信号，将其发送给控制单元，控制单元通过动作单元控制上缸电机、下缸电机工作，使得上缸油箱和下缸油箱内产生油压，顶出上缸与下缸；
2)下行程调节；当检测单元检测到压力机滑块下行程时，将其发送给控制单元，控制单元输出控制信号，通过动作单元调节上缸油箱和下缸油箱内油压内的油压，精确确定上缸与下缸顶出的位置；
3)下行程保压；当检测到压力机滑块接近下死点时，将其发送给控制单元，控制单元输出控制信号，通过动作单元控制上缸油箱和下缸油箱内油压内的处于保压状态；
4)上行程调节；当检测单元检测到压力机滑块上行程时，将其发送给控制单元，控制单元输出控制信号，通过动作单元调节上缸油箱和下缸油箱内油压内的油压，粗率确定上缸与下缸顶出的位置；
5)循环步骤2-4。
作为本发明的进一步限定，步骤1)与步骤2)之间还包括压力调整步骤，输入信号给控制单元，通过动作单元对上缸油箱与下缸油箱分别进行油压压差调整。为了增大本发明的适应范围，可适应不同规格的工件加工。
作为本发明的进一步限定，步骤1)到步骤5)过程，当油压顶出上缸和下缸发生故障，输入信号给控制单元，通过动作单元对上缸油箱和下缸油箱进行卸荷处理。为了使得维 修更加方便。
作为本发明的进一步限定，所述控制单元选用PLC；所述检测单元包括连接在压力机转轴上的角度检测传感器以及与其配合的触发开关，触发开关连接在PLC上；所述动作单元包括交流接触器和电磁阀，交流接触器用以控制上缸电机、下缸电机，电磁阀用以控制上缸油箱与下缸油箱内的油压；所述PLC上还连接有触摸屏，用以输入信号。
作为本发明的进一步限定，步骤3)下行程保压时，接近下死点的触发位置为下行总行程的80％-90％。
一种双缸液压顶出控制系统，包括主电路单元和主控单元，所述主电路单元包括经交流接触器触头连接在电源上的上缸电机和下缸电机，所述主控单元包括：
控制单元，用以控制压力机的工作过程；
检测单元，用以检测压力机滑块行程状态，并将其发送给控制单元；
动作单元，用以接收来自控制单元的控制信号，通过交流接触器控制上缸电机、下缸电机工作，通过电磁阀控制上缸油箱、下缸油箱内的油压。
作为本发明的进一步限定，所述检测单元包括连接在压力机转轴上的角度检测传感器以及与其配合的触发开关，触发开关连接在控制单元输入端。
作为本发明的进一步限定，所述动作单元包括交流接触器线圈和工作电磁阀；所述交流接触器线圈包括控制上缸电机工作的上缸接触器线圈KM1和控制下缸电机工作的下缸接触器线圈KM2，所述工作电磁阀包括控制上缸内油压的上缸工作电磁阀YV1和控制下缸内油压的下缸工作电磁阀YV2。
作为本发明的进一步限定，所述主电路单元还包括压差电机和冷却电机，压差电机和冷却电机通过交流接触器触头连接在电源上，动作单元还包括与压差电机配合的电磁阀以及与冷却电机配合的交流接触器线圈。
作为本发明的进一步限定，所述交流接触器触点与上缸电机、下缸电机、压差电机、冷却电机之间设置有热继电器。
与现有技术相比，本发明的有益效果在于：
(1)本发明能适应多种规格的工件成形，根据冲压工件的材料厚度，设置上、下缸油压的精准调节；
(2)本发明具有精调、粗调功能，较大的提升工件加工速率，且保证了冲压工件成形效果；
(3)该液压顶出控制系统具有压差调整、电动卸荷等功能，方便保养并降低后期维修难度。
附图说明
图1为本发明控制原理框图。
图2为本发明系统原理接线图。
其中，各类元件名称与代号对应表1：
表1
Figure PCTCN2019080731-appb-000001
PLC输入、输出定义如表2
表2
输入 功能 输出 功能
X0 液位高检测信号 Y0 下缸电机交流控制
X1 液位低检测信号 Y1 上缸电机交流控制
X2 下缸油压回路堵塞 Y2 压差电机交流控制
X3 上缸油压回路堵塞 Y3 冷却电机交流控制
X4 压力机下行程角度信号 Y4 下缸工作电磁阀YV1
X5 压力机上行程角度信号 Y5 上缸工作电磁阀YV2
X6 压力机启动信号 Y6 下缸工作电磁阀YV3
X7 下缸电机过电流保护 Y7 上缸工作电磁阀YV4
X10 上缸电机过电流保护 Y10 下缸调整电磁阀
X11 压差电机过电流保护 Y11 上缸调整电磁阀
X12 冷却电机过电流保护    
       
。
具体实施方式
下面结合具体实施例对本发明做进一步说明。
如图1-2所示的一种双缸液压顶出控制系统，包括：
主电路单元：三相380V、50Hz动力电源经空气开关QF保护，分别接至四只交流接触器触点KM1-1、KM2-1、KM3-1、KM4-1上端，交流接触器KM1-1、KM2-1、KM3-1、KM4-1下端与热继电器FR1、FR2、FR3、FR4相连，经热继电器FR1、FR2、FR3、FR4过电流保护，再分别接至四台电机，分别为下缸电机M1、上缸电机M2、压差电机M3、冷却电机M4；
控制回路：三相380V、50Hz动力电源取二相接入变压器TC，输出AC220V交流控制电源，接至PLC电源端子，压力机角度、液位检测、回路堵塞输入信号引至可编程控制器输入端；可编程控制器输出端经交流接触器KM1-4至电机，可编程控制器输出端至电磁阀YV1-YV6，可编程控制器RS485通讯模块至连线接口。
一种双缸液压顶出控制方法，包括以下步骤：
1)压力机启动信号SQ7接通后，经可编程控制器程序编程，交流接触器KM1、交流接触器KM2与交流接触器KM4接通；KM1接通后，下缸电机M1运转，下缸油箱内有压力；KM2接通后，上缸电机M2运转，上缸油箱内有压力；KM4接通后，冷却电机M4运转，油脂冷却循环开始。
2)下行程一次调节；压力机下行程角度信号SQ5接通后，经可编程控制器程序编程，下缸工作电磁阀YV1与上缸工作电磁阀YV2通电工作；因下缸电机M1与上缸电机M2运转，箱内有油压，所以下缸工作电磁阀YV1与上缸工作电磁阀YV2接通后，通过油压让下缸体、与上缸体顶出，进行精调节；
3)下行程保压；当压力机下行程角度信号SQ5断开后，角度断开信号可转化成下行程位置信号，对应的断开触发位置为下行总行程的80％-90％，经可编程控制器程序编程，下缸工作电磁阀YV1与上缸工作电磁阀YV2断电停止工作(压力机下行程角度信号SQ5接通与断开也可通过手动调整，确保在上、下模具闭合前完成顶出行程)，通过压力机的下死点位置的闭合冲压，下、上缸配合模具对工件进行保压加工；
4)上行程调节；因压力机的闭合冲压，会导致下、上缸的退回，在经过下死点位置闭合冲压后，压力机上行程角度信号SQ6接通，经可编程控制器程序编程，下缸工作电磁阀YV3与上缸工作电磁阀YV4通电再次工作，下缸体、与上缸体顶出，进行粗调节；
5)下行程二次调节；压力机上行完成后，下行程角度信号SQ5再次接通后，经可编程控制器程序编程，下缸工作电磁阀YV3与上缸工作电磁阀YV4断电停止工作，下缸工作电磁阀YV1与上缸工作电磁阀YV2通电工作；因下缸电机M1与上缸电机M2运转，箱内有油压，所以下缸工作电磁阀YV1与上缸工作电磁阀YV2接通后，通过油压让下缸体、与上缸体顶出，再次进行精调节，如此循环。
本发明控制方法还具有调压模式，包括下、上缸油压设定和下、上油压卸荷；分别为：
下、上缸油压设定：液压顶出有两只缸，分为上缸与下缸，根据客户加工工件的需求，需要对上缸与下缸分别进行油压压力的调整；当需要设定上、下缸油压时，先在触摸屏中进行“压差调整”按钮点击，经可编程控制器程序编程，交流接触器KM3接通；KM3接通后，压差电机M3运转，油压调整回路有压力，再通过手动阀，结合压力表分别进行上、下缸油压调整。调整结束后，将触摸屏中“压差调整”按钮再次点击，断开交流接触器KM3，压差电机M3停止运转。
下、上油压卸荷：当液压顶出上缸与下缸发生故障，此时需要将上缸与下缸油压进行卸荷操作，以保证检修时油缸与油路内无压力。先在触摸屏中进行“手动卸荷”按钮点击，经可编程控制器程序编程，下缸调整电磁阀YV5与上缸调整电磁阀YV6接通，将油缸与油路内油压卸到油箱内，确保检修工作正常开展，避免油脂外泄，保护操作者安全。当检修结束后，再按下触摸屏中“手动卸荷”按钮，下缸调整电磁阀YV5与上缸调整电磁阀YV6自动断开。
本发明具备以下优点：
(1)调试时下、上缸油压设定，点击触摸屏中“压差调整”按钮，压差电机M3工作，此时会停止下缸电机M1与上缸电机M2工作或不能启动工作，确保手动精准调整下、上缸油路压力，避免下缸电机M1与上缸电机M2电机运转产生的油压，具有互锁操作。
(2)调试时下、上油压卸荷操作，点击触摸屏中“手动卸荷”按钮，此时会先停止下缸电机M1与上缸电机M2工作或不能启动工作，再停止下缸工作电磁阀YV1与上缸工作电磁阀YV2，然后再接通下缸调整电磁阀YV5与上缸调整电磁阀YV6，避免一边卸荷一边补充油压；
(3)液位高、低限位检测(SQ1、SQ2)，当油箱内油脂低于低限位或高于高限位，经过检测开关接通，将采集信号引至可编程控制器输入端，经可编程控制器程序编程，将信号保持，停止液压站所有电机工作，并在触摸屏中显示报警，提示操作者进行检修，然后点击触摸屏中“复位”按钮操作，解除故障。
(4)油压回路堵塞(SQ3、SQ4)，液压站油箱至油缸回路中具有堵塞报警装置，当油脂内杂质过多，堵塞报警装置检测开关接通，将采集信号引至可编程控制器输入端，经可编程控制器程序编程，将信号保持，不停止液压站所有电机工作，只在触摸屏中显示报警，提示操作者进行清理，然后点击触摸屏中“复位”按钮操作，解除故障。
(5)下缸电机M1与上缸电机M2启动时，如直接让下缸工作电磁阀YV1与上缸工作电磁阀YV2通电工作，带载启动，导致电机电流过大，引起热继电器跳电保护。对此进行了延时启动电磁阀的控制，在下缸电机M1与上缸电机M2启动10秒后，再让下缸工作电磁阀YV1与上缸工作电磁阀YV2通电工作，实现平稳工作，避免刚启动时频率跳电保护。
(6)预留有RS485通讯接口，压力机与液压站通过RS485通讯协议进行数据交换，当液压站检测到液位高、液位低、电机停止等信号，传递给压力机控制可编程控制器，控制压力机停机操作，避免因液压站不工作，压力机单独冲压时，导致工作报废，增加成本。
本发明并不局限于上述实施例，在本发明公开的技术方案的基础上，本领域的技术人员根据所公开的技术内容，不需要创造性的劳动就可以对其中的一些技术特征作出一些替换和变形，这些替换和变形均在本发明的保护范围内。

Claims (10)

  1. 一种双缸液压顶出控制方法，其特征在于，包括以下步骤：
    1)启动电机；当检测单元检测到启动信号，将其发送给控制单元，控制单元通过动作单元控制上缸电机、下缸电机工作，使得上缸油箱和下缸油箱内产生油压，顶出上缸与下缸；
    2)下行程调节；当检测单元检测到压力机滑块下行程时，将其发送给控制单元，控制单元输出控制信号，通过动作单元调节上缸油箱和下缸油箱内油压内的油压，精确确定上缸与下缸顶出的位置；
    3)下行程保压；当检测到压力机滑块接近下死点时，将其发送给控制单元，控制单元输出控制信号，通过动作单元控制上缸油箱和下缸油箱内油压内的处于保压状态；
    4)上行程调节；当检测单元检测到压力机滑块上行程时，将其发送给控制单元，控制单元输出控制信号，通过动作单元调节上缸油箱和下缸油箱内油压内的油压，粗率确定上缸与下缸顶出的位置；
    5)循环步骤2-4。
  2. 根据权利要求1所述的一种双缸液压顶出控制方法，其特征在于，步骤1)与步骤2)之间还包括压力调整步骤，输入信号给控制单元，通过动作单元对上缸油箱与下缸油箱分别进行油压压差调整。
  3. 根据权利要求1所述的一种双缸液压顶出控制方法，其特征在于，步骤1)到步骤5)过程，当油压顶出上缸和下缸发生故障，输入信号给控制单元，通过动作单元对上缸油箱和下缸油箱进行卸荷处理。
  4. 根据权利要求2或3所述的一种双缸液压顶出控制方法，其特征在于，所述控制单元选用PLC；所述检测单元包括连接在压力机转轴上的角度检测传感器以及与其配合的触发开关，触发开关连接在PLC上；所述动作单元包括交流接触器和电磁阀，交流接触器用以控制上缸电机、下缸电机，电磁阀用以控制上缸油箱与下缸油箱内的油压；所述PLC上还连接有触摸屏，用以输入信号。
  5. 根据权利要求4所述的一种双缸液压顶出控制方法，其特征在于，步骤3)下行程保压时，接近下死点的触发位置为下行总行程的80％-90％。
  6. 一种双缸液压顶出控制系统，其特征在于，包括主电路单元和主控单元，所述主电路单元包括经交流接触器触头连接在电源上的上缸电机和下缸电机，所述主控单元包括：
    控制单元，用以控制压力机的工作过程；
    检测单元，用以检测压力机滑块行程状态，并将其发送给控制单元；
    动作单元，用以接收来自控制单元的控制信号，通过交流接触器控制上缸电机、下缸电机工 作，通过电磁阀控制上缸油箱、下缸油箱内的油压。
  7. 根据权利要求5述的一种双缸液压顶出控制系统，其特征在于，所述检测单元包括连接在压力机转轴上的角度检测传感器以及与其配合的触发开关，触发开关连接在控制单元输入端。
  8. 根据权利要求6所述的一种双缸液压顶出控制系统，其特征在于，所述动作单元包括交流接触器线圈和工作电磁阀；所述交流接触器线圈包括控制上缸电机工作的上缸接触器线圈KM1和控制下缸电机工作的下缸接触器线圈KM2，所述工作电磁阀包括控制上缸内油压的上缸工作电磁阀YV1和控制下缸内油压的下缸工作电磁阀YV2。
  9. 根据权利要求8所述的一种双缸液压顶出控制系统，其特征在于，所述主电路单元还包括压差电机和冷却电机，压差电机和冷却电机通过交流接触器触头连接在电源上，动作单元还包括与压差电机配合的电磁阀以及与冷却电机配合的交流接触器线圈。
  10. 根据权利要求9所述的一种双缸液压顶出控制系统，其特征在于，所述交流接触器触点与上缸电机、下缸电机、压差电机、冷却电机之间设置有热继电器。
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