WO2010072160A1

WO2010072160A1 - Hydraulic protection pressure detecting system and method for protecting fine tuning mechanism of press

Info

Publication number: WO2010072160A1
Application number: PCT/CN2009/075972
Authority: WO
Inventors: 陈荣; 段毅
Original assignee: 奇瑞汽车股份有限公司
Priority date: 2008-12-25
Filing date: 2009-12-24
Publication date: 2010-07-01
Also published as: CN101602264A

Abstract

A hydraulic protection pressure detecting system for protecting the fine tuning mechanism of a press comprises a pressure transducer (2) for dynamically measuring the hydraulic protection pressure and transmitting the measured data to an analog-digital (AD) module (5) of a PLC. The AD module (5) processes the measured data. The system further comprises a relay (4) for performing the press-driven enabling of the press when the pressure processed by the AD module (5) is normal, system pressure error verification means (7) for determining if said pressure is too high and interrupting the press-driven enabling of the fine tuning mechanism if said pressure is too high, and a human-machine interface (HMI) for displaying the pressure data of the AD module (5) and the alarming of ERROR as well as the condition of the press-driven enabling. A hydraulic protection pressure detecting method for protecting a fine tuning mechanism of a press is also disclosed. The system and the method can ensure the normal operation of the fine tuning mechanism of a press and reduce cost.

Description

Hydraulic protection pressure detecting system and method for protecting press fine adjustment mechanism

Technical field

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

Usually, 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. Currently, 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.

At present, the most common failure of the press fine-tuning system used in the industry is the fine-tuning of the coupling due to the above-mentioned causes of cracking, damage to the worm and the like. Summary of the invention

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 use of the transformer on the structure of the press equipment.

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 ΗΜΙ, hereinafter referred to as ΗΜΙ) ), 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.

Preferably, the system further comprises: a communication connection module, which uses an RS485 cable for communication between the system and the PLC.

Preferably, 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.

Preferably, 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.

The hydraulic protection pressure detecting method for protecting the fine adjustment mechanism is characterized in that it has the following steps:

(1) 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;

(2) Judging the interruption step to judge whether the pressure is normal or too large, and performing fine adjustment when the pressure is normal and fine adjustment when the pressure is too large;

(3) The value shows the alarm step, and the read value is displayed on ' ΉΜΓ and the ERROR signal is displayed.

Preferably, 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.

Compared with the prior art, 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. Technical Solution of the Invention 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.

Other objects and effects of the present invention will be fully described in the following detailed description and the accompanying drawings. DRAWINGS

Figure 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;

Figure 5 is a flow chart of the PLC system operation processing;

Figure 6 shows the interlock interrupt flow chart. detailed description

In view of the above design structure principle and concept, 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.

Due to the analog processing of the pressure transmitter, the detection accuracy is greatly improved, and 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.

The present system for applying a pressure transmitter protection fine adjustment mechanism, and the measurement and use method of the system will be further described in detail below with reference to the accompanying drawings to assist those skilled in the art in the concept of the present invention. The technical solution has a more complete and accurate understanding.

Figure 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. "115" is the word address of the OMRON analog quantity, and the BCD(24) instruction of Figure 1 is used. Convert the binary number into a BCD code that can be easily read by the operation, and store the number in the data access area DM2806; according to the analog-to-digital conversion principle formula y=kx (x is the pressure sent on the hydraulic protection piston system of the press The analog current type input value detected by the transformer, k is the slope, and y is the conversion value. The slope is calculated by solving the one-dimensional equation and the slope is k=#0150 ("#" is the numerical expression in OMRON PLC). 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. Through the CMP (20) command in Figure 3, compare the pressure value obtained by DIV (33) operation with the normal preload value of the press hydraulic pressure protection 10MPA, "P-GT""P-EQ" Invoking the OMRON PLC instruction for 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. In the figure, 5 is the "hydraulic protection pressure normal" indicator on the control panel of the press equipment, and 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.

When the value detected by "115" in the segment 1 is greater than or equal to 13MPA by the above operation, 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.

Figure 2 is a structural diagram of the detection system of the present invention:

When the hydraulic protection pressure transmitter is turned on, 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. After the BCD number is obtained, 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.

Figure 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:

(1) Initialization step, ie 1 step.

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.

(2) Determine the interruption step, that is, 2, 3, 4, 5, 6, and 7 steps.

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.

(3) The numerical display alarm step, step 7-1 "HMI Digital Display Alarm", displays the read value on the HMI and displays the ERROR signal.

As shown in Figure 4, to initialize the program flow chart:

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.

Figure 5 shows the flow chart for the PLC system operation processing:

Step 19 is to start the operation. In step 20, 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. At this time, in step 22, 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:

Through the series operation calculation, the pressure value of the hydraulic protection system is obtained. In 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. If it is normal, that is, the determination is yes, then the process proceeds to step 30 to determine 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. In 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. 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:

One is its detection mechanism, that is, the pressure transmitter. By the way, 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:

1. 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.

2. Compare the real-time hydraulic protection pressure with the normal pre-pressure value of 10MPA that can be withstood by the fine-tuning system to determine whether the pressure is too large. Send the comparison result to the PLC, interrupt the fine-tuning drive interlock, and display it on the HMI. It not only makes the structure more stable and firm, but also reduces maintenance costs while greatly reducing the failure rate. At the same time, it is convenient for the process management personnel to find out the influence of the stamping load pressure on the stamping effect of the mold and improve the process level.

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.

It is to be understood that the present invention may be embodied in other forms without departing from the spirit and essential characteristics of the invention. Therefore, the above embodiments will be considered as illustrative of this technical solution, and are not defined by the dependent claims, but are defined by the foregoing description, and any changes made within the meaning and scope of the claims of the present invention should be included. In the present invention.

Claims

Claim

1. The hydraulic protection pressure detecting system for protecting the fine adjustment mechanism of the press, characterized in that:

The pressure transmitter is configured to dynamically collect and measure the hydraulic protection pressure, and transmit the measurement data to the AD module; the AD module is configured to perform data processing operations on the collected signal;

The system pressure normal output relay is used to perform the press stroke drive enable of the normal pressure of the AD module operation processing;

The system pressure ERROR check device exchanges the set check value with the hydraulic protection pressure value calculated by the AD module in the PLC to obtain the verification result. If the hydraulic protection pressure is too large, the fine adjustment drive is enabled;

Man-machine interface, 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.

2. The hydraulic protection pressure detecting system for protecting a press fine adjustment mechanism according to claim 1, wherein the system further comprises:

Communication connection module, using RS485 cable, used to communicate with PLC.

3. The hydraulic protection pressure detecting system of the protective press fine adjustment mechanism according to claim 1, wherein the hydraulic protection pressure detecting system of the protection fine adjustment mechanism, the interlocking of the pressure detecting device by the pressure transmitter comprises: Normal pressure fine-tuning execution, excessive pressure fine-tuning interruption.

A hydraulic protection pressure detecting system for protecting a press fine adjustment mechanism according to claim 1, wherein said system first converts the input analog quantity and pressure variable into a binary number, and then performs conversion into a BCD code.

5. The hydraulic protection pressure detecting method for protecting a fine adjustment mechanism of a press according to claim 1, comprising the steps of:

(2) judging the interruption step for judging whether the pressure collected by the pressure transmitter is normal or too large, and performing fine adjustment when the pressure is normal and fine adjustment when the pressure is too large;

(3) The value shows the alarm step, and the read value is displayed on the HMI and the ERROR signal is displayed.