WO2010072160A1 - 保护压力机微调机构的液压保护压力检测***及方法 - Google Patents

保护压力机微调机构的液压保护压力检测***及方法 Download PDF

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Publication number
WO2010072160A1
WO2010072160A1 PCT/CN2009/075972 CN2009075972W WO2010072160A1 WO 2010072160 A1 WO2010072160 A1 WO 2010072160A1 CN 2009075972 W CN2009075972 W CN 2009075972W WO 2010072160 A1 WO2010072160 A1 WO 2010072160A1
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Prior art keywords
pressure
press
hydraulic protection
module
fine adjustment
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PCT/CN2009/075972
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English (en)
French (fr)
Inventor
陈荣
段毅
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奇瑞汽车股份有限公司
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Application filed by 奇瑞汽车股份有限公司 filed Critical 奇瑞汽车股份有限公司
Publication of WO2010072160A1 publication Critical patent/WO2010072160A1/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
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof
    • B30B15/281—Arrangements for preventing distortion of, or damage to, presses or parts thereof overload limiting devices

Definitions

  • the invention belongs to the technical field of automobile production equipment, in particular to a press equipment for automobile stamping production, and is a hydraulic protection pressure detecting system and method for protecting a mechanical closed four-point press fine adjustment mechanism. Background technique
  • stamping is the leading process in automobile production.
  • Press equipment is the main heart of stamping production and transportation.
  • the fine-tuning system is an indispensable part of the large-tonnage press equipment.
  • presses above 6300KN tonnage are usually equipped.
  • There is a micro-speed adjustment mechanism system (hereinafter referred to as "fine-tuning system"), which is driven by the motor and its coupling when the "fine-tuning system” starting condition is satisfied, because the worm of the fine-tuning system is embedded on the high-speed shaft based on the brake. Therefore, the brake shock load of the press brake, the mold height of the mold are not finely adjusted, and the fine adjustment is used as the press power press, which causes the wear of the motor, the coupling, the worm and the like of the fine adjustment system.
  • the purpose of the invention is to solve the technical problem, overcome the disadvantages of the existing fine tuning system in the actual production application due to the imperfect protection, and ensure that the equipment can operate in a normal operation while saving a large amount of cost, thereby applying a pressure transmission.
  • the idea of the invention is to design and develop an application control program of the pressure transmitter on the structure of the press device, so that the pressure transmitter can dynamically detect the load pressure of the hydraulic pad of the press slider and display it on the human-machine interface. It avoids the operator's misoperation and saves maintenance costs, thus ensuring the continuity of production and reducing the loss caused by equipment damage.
  • the hydraulic protection pressure detecting system of the fine adjustment mechanism of the present invention is characterized by comprising: a pressure transmitter for dynamically collecting and measuring the hydraulic protection pressure, and transmitting the measurement data to the analog module (the Analog Module is reduced to AD, The following is abbreviated as AD module), AD module, used for data processing operation on the set signal; system pressure normal output relay, used for the normal pressure of the AD module to calculate the operation of the press stroke drive enable; system pressure ERROR Inspection device, and programmable logic controller (Programmable logic The Controller is abbreviated as PLC, hereinafter referred to as PLC).
  • the AD module exchanges pressure to determine whether the hydraulic protection pressure is too large. If it is too large, the interrupt fine-tuning drive is enabled.
  • the human machine interface (Human Machine Interface is abbreviated as ⁇ , hereinafter referred to as ⁇ ) ), used to display the operational metering data of the AD module and the pressure ERROR alarm detected by the system and the enabling condition of the execution loop.
  • the system further comprises: a communication connection module, which uses an RS485 cable for communication between the system and the PLC.
  • a communication connection module which uses an RS485 cable for communication between the system and the PLC.
  • the hydraulic protection pressure detecting system of the protection fine adjustment mechanism detects the interlocking process of the processing by the pressure transmitter, and includes: a normal pressure fine adjustment execution, and an excessive pressure fine adjustment interruption.
  • the system converts the analog quantity and pressure variable (unit "MPA", English full name Master of Public Administration) collected by the pressure transmitter into a binary number, and then converts the operation into a BCD code.
  • MPA analog quantity and pressure variable
  • Initialization step that is, the definition of the input type of the AD module after the power-on, the definition of the input channel, the definition of the data area assignment, the definition of the closed-loop feedback interrupt, and the initialization of the communication parameters;
  • the system will judge the overload protection of the press (the industry terminology is “hydraulic protection”, hereinafter referred to as “hydraulic protection”). Is the pressure normal, whether the hydraulic protection and the stroke of the press are normal, and whether the hydraulic protection pressure is normal? Excessively large, and whether the "fine adjustment mechanism" is used for stamping operations, and the fine adjustment mechanism is enabled to interrupt the operation.
  • the technical solution provided by the invention can not only ensure the continuity of production smoothly, but also ensure the mass production, and also has the low failure rate, the low investment, the low operation and maintenance cost, and the quick and convenient replacement. Conducive to saving production costs.
  • the PLC program is implemented based on the functions of the OMRON C200HG series PLC, and is also applicable to any brand of PLC with analog/digital functions.
  • FIG. 1 is a PLC program diagram of the present invention
  • Figure 2 is a structural view of the detection system of the present invention.
  • Figure 3 is a flow chart of the main routine of the present invention.
  • Figure 4 is a flow chart of the initialization procedure
  • FIG. 5 is a flow chart of the PLC system operation processing
  • Figure 6 shows the interlock interrupt flow chart.
  • the system effectively combines the initialization device, the definition of the AD module, the reading operation of the power data, the external output relay, the HMI, etc., thereby collecting the data from the signal of the pressure transmitter.
  • the processing and processing until the protection press "fine tuning system” is implemented, the system and method are formed.
  • the analog detection program developed and developed facilitates the realization of the protection interlocking program, simplifies the mechanical design structure, and improves the reliability of the product. Sex.
  • FIG 1 shows the ladder diagram of the PLC program of the present invention
  • the segment 1 program is used for hydraulic protection pressure detection, which is the detection link of the present invention.
  • the pressure value detected by the pressure transmitter mounted on the press hydraulic protection piston system is fed back to the PLC in binary format.
  • P-on is the normal-command instruction in the OMRON PLC instruction set in the invention, which is the initial condition for triggering the execution of the BCD(24) instruction.
  • the division operation is performed by the DIV (33) instruction of Fig. 2, and the result of the operation is the pressure value detected by the pressure sensor in the solution of the present invention.
  • the concentration is greater than or equal to the flag command, and the comparison is greater than or equal to the result. 4 in the figure indicates "hydraulic protection pressure is normal".
  • the design of the section 2 program replaces the normality of the hydraulic protection and its overload and re-adjustment conditions.
  • 5 is the "hydraulic protection pressure normal” indicator on the control panel of the press equipment
  • the figure 6 is “hydraulic protection re-adjustment” .
  • the segment 3 program uses the 7 CMP (20) command in the figure to define the "hydraulic protection pressure is too large” in the figure 8 when the hydraulic protection pressure is greater than or equal to 13MPA, and interlocks with the fine adjustment system to enable the drive of the fine adjustment system. Perform "fine tuning forward” in Figure 9 and “fine tuning inversion” in Figure 10.
  • the electrical enable signal of the "fine tuning system” is interrupted, thereby preventing the "fine tuning mechanism” from performing the punching operation. Designed to protect the fine-tuning system from damage caused by large hydraulic pressure loads.
  • FIG. 2 is a structural diagram of the detection system of the present invention:
  • the pressure transmitter installed on the hydraulic protection piston system of the press uses the RS485 communication connection cable to start the closed-loop analog signal collector to collect from the hydraulic protection piston system.
  • the pressure is transmitted to the AD003 processing module of the programmable controller for arithmetic processing.
  • the hydraulic protection pressure is activated.
  • the external external output relay enables the pressure mechanism to drive, and the ERROR calibration device detects the hydraulic protection pressure.
  • the process is verified and displayed on the HMI, specifically: The set check value of the ERROR check device is exchanged with the hydraulic protection pressure value calculated by the AD module in the PLC to obtain the check result, if the hydraulic protection pressure If it is too large, the interrupt fine-tuning drive is enabled.
  • FIG. 3 is a flow chart of the main program of the present invention:
  • the specific application method of the hydraulic protection pressure detecting system and method for the protection fine adjustment mechanism has the following steps:
  • step 1 After the power is turned on in step 1, the definition of the input type of the AD module, the definition of the input channel, the definition of the data area assignment, the definition of the closed-loop feedback interrupt, and the initialization of the communication parameters are performed.
  • step 3 After the hydraulic protection pressure compensation in step 2 is completed, the pressure transmitter of step 3 starts to detect the pressure of the hydraulic protection, and it is determined by step 4 whether there is a change data value (hereinafter referred to as "variable value"), if there is no variable value, Then proceed to step 5 to perform "hydraulic protection reset” and return to step 2 to execute cyclically; if there is a variable value, proceed to step 6 "read pressure transmitter value", and obtain the hydraulic pressure through the "logic operation” of step 7.
  • Protect the system pressure value determine whether the hydraulic protection pressure is normal in the "pressure is normal” in step 8, if yes, perform the "pressure” in step 9. Force drive enable", if otherwise enter the "system interrupt” of step 10, and return to step 1 to re-execute each step.
  • step 7-1 HMI Digital Display Alarm
  • Step 11 is to start the action, in step 12, the definition of the input type of the AD module is performed, and in step 13, the definition of the input channel of the AD module is performed, after which the assignment definition of the data area is initialized in step 14, respectively, and then in step 15
  • the closed loop feedback interrupt initialization is performed, so that the reading of the pressure transmitter detection value is completed in step 16, and after the interruption is completed in step 17, the main program flow is executed in step 18.
  • FIG. 5 shows the flow chart for the PLC system operation processing
  • Step 19 is to start the operation.
  • the detected value is input to the verification AD module, and then the verification value sequence conversion is performed in step 21 to perform data logic processing.
  • the pressure transmitter real time value is read, the value conversion is performed in step 23, and the value is displayed in step 24.
  • Figure 6 shows the interrupt flow chart for interlocking
  • step 26 the pressure value of the hydraulic protection system obtained through the series operation processing is compared with the normal definition value of the hydraulic protection pressure, and it is judged whether the hydraulic protection pressure is normal or not. If the judgment is yes, that is, the hydraulic protection pressure is normal, the hydraulic protection and the stroke interlocking condition of step 28 are entered; if the determination is no or the judgment interruption step is performed, the routine proceeds to step 27, the hydraulic protection pressure compensation is executed, and the pressure is re-executed. This step until the normal hydraulic protection pressure is obtained. In step 28, it is judged whether the hydraulic protection and the stroke interlocking condition are normal.
  • step 30 determines whether the hydraulic protection pressure is excessively large; if not, or after the judgment interruption step is performed, the operation proceeds to the step 29 Perform hydraulic protection and stroke interruption and re-execute this step.
  • step 30 it is judged whether the hydraulic protection pressure is too large. If the hydraulic protection pressure is not too large, that is, if the determination is not, then proceed to step 32 to confirm whether the trimming is performed, and if it is judged to be or is judged to be interrupted. In the step, the process proceeds to step 31, the press stroke is interrupted, and the step is re-executed.
  • step 32 When step 32 is entered to confirm whether to trim the press, if it is judged as not, then enter 34 "return 25" to re-execute the interlock interrupt process of the system. If yes or execute the judgment interrupt step, proceed to step 33 to perform fine adjustment.
  • the driver enables the interrupt and re-executes this step.
  • the invention changes the structure of the hydraulic pressure protection digital detection of the press in the past. In the past, as long as the predetermined value is reached, the normal signal is given, and the interlocking other parts such as the fine adjustment system cannot be protected, due to the technical list of the mechanism. As a result, the press fine-tunes the system coupling and the destruction of the worm and worm, resulting in a lot of cost waste.
  • the invention is divided into two parts:
  • the pressure transmitter is a pressure transmission component that has been introduced to the market for many years. It has the characteristics of low cost, high detection accuracy, and the like. Used in hydraulic presses and other hydraulic equipment.
  • the invention utilizes mature products to provide powerful external force support for the invention of the device, and combines the overall structural features of the current device, does not affect the use of the overall device, and greatly improves the performance of the overall device, is more reliable, more robust, specific It has the following advantages:
  • the original hydraulic protection switch quantity relay is changed to analog-to-digital conversion sensor, which is beneficial to dynamically detect the real-time load pressure of the hydraulic pad system. This can not only detect the normal pressure during production, but also detect the error. Load force during operation or illegal operation.
  • the other one is the PLC program independently developed in the present invention, and the analog signal detected by the pressure sensor can complete a relatively complicated analog-to-digital conversion process by the less OMRON PLC instruction cited in the present invention, so the invention is the largest.
  • the characteristic is innovation and uniqueness, which is consistent with the concept of establishing a resource-saving enterprise advocated by our country.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Measuring Fluid Pressure (AREA)

Description

保护压力机微调机构的液压保护压力检测***及方法
技术领域
本发明属于汽车生产设备的技术领域， 具体地说， 涉及一种汽车冲压生产的压力 机设备， 是一种保护机械闭式四点压力机微调机构的液压保护压力检测***和方法。 背景技术
通常， 冲压作为汽车生产的龙头工艺， 压力机设备是冲压生产输送的主心骨， 而 微调***则是大吨位压力机设备中的不可或缺的主体部分， 目前在 6300KN吨位以上 的压力机通常均配有微速调整机构*** （以下简为 "微调*** "）， 在 "微调***" 开 动条件满足时由电机及其联轴节带动涡轮蜗杆传动， 由于微调***的涡轮蜗杆是基于 制动器嵌于高速轴上， 因此在受压力机制动器的制动冲击载荷、 模具装模高度没有精 调整、 用微调作为冲压动力压件均会导致微调***的电机、 联轴节、 涡轮蜗杆等磨损 损坏。
目前， 本行业内使用的压力机微调***出现最多的故障为微调联轴节受上述原因 导致的开裂、 涡轮蜗杆的损伤等。 发明内容
本发明的的目的是为了解决技术问题， 克服现有微调***由于保护不完善在实际 生产应用当中的诸多弊端， 保证设备在正常运行的同时， 还能节约大量的成本，从而应 用一种压力送变器在压力机设备结构上的使用。
本发明的构思是， 设计开发压力送变器在压力机设备结构上的应用控制程序， 使 得压力送变器能够动态的检测到压力机滑块液压垫的载荷压力， 并且显示到人机界面 上， 避免操作者的误操作， 节约维修费用， 从而保证生产的连续性， 减少因设备损坏 停线造成的损失。
本发明的微调机构的液压保护压力检测***， 其特征在于包括： 压力送变器， 用 于对液压保护压力进行动态釆集测量， 并将计量数据传送给模拟量模块 (Analog Module缩为 AD， 以下简称为 AD模块)， AD模块， 用于对釆集信号进行数据处理运 算； ***压力正常输出继电器， 用于对 AD模块运算处理的正常压力的执行压机行程 驱动使能； ***压力 ERROR校验装置， 用于和可编程序控制器 （Programmable logic Controller缩写为 PLC, 以下简称为 PLC) 的 AD模块交换压力， 判断液压保护压力是 否过大， 是否过大， 则中断微调驱动使能； 人机界面 （Human Machine Interface 缩写 为 ΗΜΙ, 以下简称为 ΗΜΙ)， 用于显示 AD模块的运算计量数据和***检测到的压力 ERROR报警及执行环的使能条件。
优选地， 所述***还包括： 通讯连接模块， 采用 RS485电缆， 用于本***与 PLC 通讯。
优选地， 所述保护微调机构的液压保护压力检测***通过压力送变器检测处理的 联锁过程， 包括： 压力正常的微调执行、 压力过大的微调中断。
优选地， 所述***将压力送变器所采集到的的模拟量和压力变量 （单位 "MPA"， 英文全称为 Master of Public Administration) 首先转换成二进制数， 然后运算转换成 BCD码。
保护微调机构的液压保护压力检测方法， 其特征在于， 具有如下步骤：
( 1 )初始化步骤， 即上电后 AD模块输入类型的定义、 输入通道的定义、 数据区 赋值的定义、 闭环反馈中断定义及对通讯参数等进行初始化；
( 2 ) 判断中断歩骤， 用以判断压力是否正常或者过大， 并且执行压力正常时的 微调和压力过大时的微调；
( 3 ) 数值显示报警步骤， 将读出的数值在' ΉΜΓ上显示出来并对 ERROR信号进 行显示。
优选地， 所述***将判断压力机的过载保护 （行业内惯用名词为 "液压保护"， 以下简称 "液压保护"） 压力是否正常、 液压保护与压力机行程联锁是否正常、 液压保 护压力是否过大、 以及是否用 "微调机构" 进行冲压作业， 并做出微调机构使能中断 操作。
与现有技术相比，本发明所提供的技术方案，不仅能够平稳的确保生产的连续性， 保证大批量的生产， 而且还具有故障率低、 投资少、 运行维护费用低、 更换快捷方便 以及有利于节约生产费用。本发明的技术方案 PLC程序是基于 OMRON公司 C200HG 系列 PLC的相关功能而实施的，同时也适用于任何品牌带有模拟量 /数字量功能的 PLC 的应用。
以下的详细介绍及附图将充分说明本发明的其他目的和效果。 附图说明
图 1为本发明的 PLC程序图；
图 2为本发明的检测***的结构图；
图 3为本发明的主程序的流程图；
图 4为初始化程序的流程图；
图 5为 PLC***运算处理流程图；
图 6为联锁中断流程图。 具体实施方式
鉴于上述的设计结构原理与构思， 本***将初始化设备、 AD 模块的定义、 电量 数据的读取运算、 外部输出继电器、 HMI等有效地结合为一体， 从而由压力送变器的 信号采集到数据运算处理直至实现保护压力机 "微调***"， 形成本***及方法。
由于采用了压力送变器的模拟量处理， 使得检测精度得到很大的提高， 而开发使 用的模拟量检测程序， 方便了保护联锁程序的实现， 简化了机械设计结构， 提高了产 品的可靠性。
下面对照附图，通过对实施例的描述，对应用压力送变器保护微调机构的本***， 以及本***的测量及使用方法作进一步详细的说明， 以帮助本领域的技术人员对本发 明的构思、 技术方案有更完整、 准确的理解。
图 1所示， 为本发明的 PLC程序梯形图：
段 1程序用于液压保护压力检测， 亦即本发明的检测环节。 安装在压力机液压保 护活塞***上的压力送变器检测到的压力值，它是以二进制数的格式反馈到 PLC上的。
"P— on"为本发明调用 OMRON PLC指令集中的常通指令，以为触发执行 BCD(24) 指令初始条件， " 115 " 为 OMRON模拟量的字地址， 通过图中①的 BCD(24)指令将二 进制数转换成能便于运算读取的 BCD码， 将该数存到数据存取区 DM2806 中； 根据 模数转换原理公式 y=kx(x 为安装在压力机液压保护活塞***上的压力送变器检测到 的模拟量电流型输入值、 k为斜率、 y为转换值)， 通过求解一元一次方程的方法调试 得出斜率 k=#0150( "#"为 OMRON PLC中数字表达式）。 通过图中②的 DIV(33)指令 执行除法运算， 其运算的结果是得出本发明方案中压力传感器检测到的压力值。 通过 图中③的 CMP(20)指令， 比较由 DIV(33)运算后得出的压力值与通常情况下的压力机 液压保护正常预压值 10MPA, "P— GT" " P— EQ"分别为本发明调用 OMRON PLC指令 集中的大于、 等于标志指令， 比较的大于等于结果通过图中④表示 "液压保护压力正 常"。
段 2程序中设计替换的是液压保护正常与否及其过载重调条件， 图中⑤是 "液压 保护压力正常" 压力机设备控制面板上的指示灯， 图中⑥是 "液压保护重调"。
段 3程序通过图中⑦ CMP(20)指令，定义液压保护压力在大于等于 13MPA时为图 中⑧的 "液压保护压力过大"， 并与微调***进行联锁， 对微调***的驱动使能分别执 行图中⑨的 "微调正转" 和图中⑩的 "微调反转"。
当段 1中的" 115"检测到的值通过上述运算大于等于 13MPA时， "微调***"开动 的电气使能信号将被中断操作， 从而避免 "微调机构"进行冲压作业。 旨在与保护微 调***不被液压保护较大的载荷压力损坏。
图 2所示， 为本发明的检测***的结构图：
当釆集液压保护压力送变器电源接通后， 安装在压力机液压保护活塞***上的压 力送变器通过 RS485通讯连接电缆使闭环模拟信号釆集器开始釆集到来自液压保护活 塞***的压力，并传送给可编程序控制器的 AD003处理模块进行运算处理，得出 BCD 数后，在激活液压保护压力正常外部输出继电器使能压力机构驱动的同时， ERROR校 验装置对液压保护压力检测过程进行校验并在 HMI上进行显示， 具体为： ERROR校 验装置的设定校验值与 PLC中的 AD模块计算处理的液压保护压力值进行交换， 得出 校验结果， 如果液压保护压力过大， 则中断微调驱动使能。
图 3所示， 为本发明的主程序流程图：
所述保护微调机构的液压保护压力检测***和方法的具体应用方法， 具有如下步 骤：
( 1 ) 初始化步骤， 即 1步骤。
在步骤 1上电后 AD模块输入类型的定义、输入通道的定义、数据区赋值的定义、 闭环反馈中断定义及对通讯参数等进行初始化。
( 2) 判断中断歩骤， 即 2、 3、 4、 5、 6、 7歩骤。
在步骤 2的液压保护压力补偿完毕后， 步骤 3的压力送变器开始检测液压保护的 压力， 由歩骤 4判断是否有变化的数据值 （以下简称 "变值 ")， 如果无变值， 则进入 步骤 5执行"液压保护复位"并返回到步骤 2循环执行；如果有变值，则进入步骤 6 "读 取压力送变器值"， 通过步骤 7的 "逻辑运算"处理后得出液压保护***压力值， 在步 骤 8的 "压力是否正常" 中判断液压保护压力是否正常， 如果是则执行步骤 9的 "压 力机驱动使能"， 若为否则进入步骤 10的 "***中断"， 并返回到歩骤 1重新执行各歩 骤。
( 3 ) 数值显示报警步骤， 即步骤 7-1 " HMI数显报警"， 将读出的数值在 HMI上 显示出来并对 ERROR信号进行显示。
图 4所示， 为初始化程序流程图：
步骤 11为开始动作， 在步骤 12中进行 AD模块的输入类型的定义、步骤 13中进 行 AD模块的输入通道的定义， 在此之后在步骤 14中分别对数据区初始化赋值定义， 然后在步骤 15中进行闭环反馈中断初始化， 从而在步骤 16中完成压力送变器检测值 的读取， 在步骤 17中完成中断后， 在步骤 18执行主程序流程。
图 5所示， 为 PLC***运算处理流程图：
歩骤 19为开始动作， 在歩骤 20将检测值输入到校验 AD模块， 随即， 在歩骤 21 执行校验值数列转换， 进行数据逻辑处理。 此时在步骤 22， 读压力送变器实时值， 在 步骤 23中进行数值换算， 在步骤 24中数值显示。
图 6所示， 为联锁中断流程图：
通过系列运算处理后得出的液压保护***压力值， 在歩骤 26， 将通过系列运算处 理后得出的液压保护***压力值与液压保护压力正常定义值比较， 判断液压保护压力 正常是否正常， 如果判断为是， 即液压保护压力正常， 则进入步骤 28的液压保护与行 程联锁条件； 若为判断为否或执行完判断中断步骤， 则进入步骤 27， 执行液压保护压 力补偿， 并重新执行本步骤， 直到得到正常的液压保护压力。 在步骤 28 , 判断液压保 护与行程联锁条件是否正常， 如果正常， 即判断为是， 则进入步骤 30执行液压保护压 力是否过大的判断； 若为否或执行完判断中断步骤， 则进入步骤 29执行液压保护与行 程中断， 并重新执行本步骤。 在步骤 30， 进行液压保护压力是否过大判断， 如果液压 保护压力不过大， 即判断为不是， 则进入在步骤 32， 进行是否为微调压件的确认， 若 判断为是或执行完判断中断步骤， 则进入在步骤 31 , 执行压力机行程中断， 并重新执 行本歩骤。 当进入歩骤 32来确认是否微调压件， 如果判断为不是， 则进入 34 "返回 25 "重新执行该***的连锁中断流程， 若为是或执行完判断中断步骤， 则进入步骤 33 执行微调驱动使能中断， 并重新执行本歩骤。 本发明改变了以往压力机液压保护压力数字量检测结构， 以往只要达到预定值便 给出正常信号， 不能保护联锁诸如微调***等压力机其他部位， 由于该机构的技术单 一导致压力机微调***联轴节、 涡轮蜗杆的破坏， 造成大量的成本浪费。 本发明分为 两部分：
一者是它的的检测机构， 即压力送变器， 顺便提到的是， 压力送变器是推出市场 多年的一种压力变送元件， 它具有成本低、 检测精度高等特点， 被广泛的应用于油压 机及其他液压设备上。 本发明借用成熟的产品为装置的发明提供有力的外力支持， 同 时结合了当前设备整体的结构特点， 不影响整体设备的使用， 而且还大大提高了整体 设备的性能， 更牢靠、 更坚固， 具体来说具备如下优点：
1、 将原先的液压保护开关量的继电器改为模数转换的传感器， 有利于动态的检 测到液压垫***的实时载荷压力， 这样不仅能够检测到生产时的正常压力， 还能检测 到由于误操作或者违章操作时的载荷力。
2、 将实时的液压保护压力与微调***可承受的液压保护正常预压值 10MPA作比 较从而确定压力是否过大， 将比较的结果送到 PLC中， 中断微调传动联锁， 并显示在 HMI上， 不仅让结构更平稳、 更牢固， 降低维修成本的同时， 大大减低了故障率。 同 时还方便了工艺管理人员对于查找由于冲压负荷压力对于模具冲压效果的影响， 提高 工艺水平。
另外一者就是本发明中自主开发的这套 PLC程序，压力传感器检测到的模拟信号 通过本发明中引用的较少的 OMRON PLC指令即可完成较为繁杂的模数转换过程， 因 此本发明最大的特点就是创新独特， 这与我们国家倡导的建立资源节约型企业的理念 是相一致的。
根据上述发明的在奇瑞公司的最佳实施案例介绍了本发明之后， 当然也可以理解 成在不偏离本发明的核心实质和基本特性的前提下， 本发明也可以以其他的形式予以 实施。 因此， 上述实施案例， 将被认为是这一技术方案的例证说明， 不由从属要求所 定义， 而由前述说明书而定义， 此外在于本发明权利要求相当的含义和范围内所作的 任何改变都应包含在本发明中。

Claims

权利要求书
1、 保护压力机微调机构的液压保护压力检测***， 其特征在于包括：
压力送变器， 用于对液压保护压力进行动态采集测量， 并将计量数据传送给 AD模块； AD模块， 用于对采集信号进行数据处理运算；
***压力正常输出继电器，用于对 AD模块运算处理的正常压力的执行压机行程驱动使 能；
***压力 ERROR校验装置， 其设定校验值与 PLC中的 AD模块计算处理的液压保护压 力值进行交换， 得出校验结果， 如果液压保护压力过大， 则中断微调驱动使能；
人机界面， 用于显示 AD模块的运算计量数据和***检测到的压力 ERROR报警及执行 环的使能条件。
2、 如权利要求 1所述的保护压力机微调机构的液压保护压力检测***， 其特征在于， 所 述***还包括：
通讯连接模块， 采用 RS485电缆， 用于与 PLC通讯。
3、 如权利要求 1所述的保护压力机微调机构的液压保护压力检测***， 其特征在于， 所 述保护微调机构的液压保护压力检测***， 其通过压力送变器检测处理的联锁包括： 压力 正常的微调执行、 压力过大微调的中断。
4、 如权利要求 1所述的保护压力机微调机构的液压保护压力检测***， 其特征在于， 所 述***将输入的模拟量和压力变量首先转换成二进制数， 然后运算转换成 BCD码。
5、 如权利要求 1所述保护压力机微调机构的液压保护压力检测方法， 其特征在于， 具有 如下步骤：
( 1 ) 初始化步骤， 即上电后 AD模块输入类型的定义、 输入通道的定义、 数据区赋值 的定义、 闭环反馈中断定义及对通讯参数等进行初始化；
( 2 )判断中断步骤， 用以判断压力送变器釆集到的压力是否正常或者过大， 并且执行 压力正常时的微调和压力过大时的微调；
( 3 ) 数值显示报警步骤， 将读出的数值在 HMI上显示出来并对 ERROR信号进行显示。
PCT/CN2009/075972 2008-12-25 2009-12-24 保护压力机微调机构的液压保护压力检测***及方法 WO2010072160A1 (zh)

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