Tonnage measuring system of composite drive press machine

Abstract

The utility model discloses a tonnage measuring system for a compound drive press, which belongs to the technical field of compound drive presses and comprises a programmable controller for controlling the working state of the compound drive press. The M load sensors are used for acquiring stress parameters of the composite drive press; the tonnage module is used for receiving an output signal of the load sensor; the distributed I / O slave station is used for executing data switching; the load sensor is connected with the tonnage module through a cable, and the tonnage module is connected with the programmable controller through the distributed I / O slave station. And the programmable controller is connected with a man-machine interaction module. According to the utility model, the load sensor is used for collecting stress parameters of the composite drive press in real time, then the man-machine interaction module is used for displaying the pressurization tonnage of the composite drive press, the tonnage module is used for analyzing and judging the parameters, and when abnormity occurs, the man-machine interaction module is used for displaying alarm information in time so as to prevent abnormal damage; the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of compound drive presses, and in particular relates to a tonnage measurement system for compound drive presses. Background Art

[0002] As we all know, compound drive presses are mainly used for blanking, punching, drawing, trimming, bending, shaping and other pressing and forming processes of automotive parts. They have high position and pressure control accuracy and can develop a variety of motion modes that meet the needs of complex forming processes. Its excellent functional characteristics are widely used in the stamping and forming of various automotive cover plates. The driving mechanism of the press is driven by a high-precision, low-damping composite oil cylinder to drive the small slide to drive the symmetrical connecting rod booster mechanism. It has the characteristics of compact structure and high efficiency. The symmetrical connecting rod booster mechanism driven by the composite oil cylinder can realize the rapid descent of the slider, slow pressurization, pressure holding, and rapid return. The symmetrical connecting rod booster mechanism has a 6-8 times force increase coefficient when it is close to the bottom dead center position. Compared with the traditional hydraulic press of the same tonnage and speed, it can reduce the output of the main cylinder and reduce the installed capacity.

[0003] When the compound drive press is pressurized, the symmetrical force-increasing mechanism needs to perform complex calculations according to the stroke output curve to obtain the accurate press tonnage, which is not user-friendly. Therefore, it is particularly important to design and develop a measurement system that directly reflects the tonnage of the press when it is pressurized. Summary of the invention

[0004] In view of the problems existing in the prior art, the utility model provides a compound drive press tonnage measurement system, which uses a load sensor to collect the force parameters of the compound drive press in real time, and then displays the pressurized tonnage of the compound drive press through a human-computer interaction module.

[0005] The technical solution adopted by the utility model is:

[0006] A compound drive press tonnage measurement system, comprising:

[0007] A programmable controller for controlling the working state of the compound drive press;

[0008] M load sensors for obtaining force parameters of the compound drive press; M is a natural number greater than 0;

[0009] A tonnage module for receiving an output signal of a load sensor;

[0010] And distributed I / O slaves that perform data transfer; among them:

[0011] The load sensor is connected to the tonnage module via a cable, and the tonnage module is connected to the programmable controller via a distributed I / O slave station; the programmable controller is connected to the human-machine interaction module

[0012] In a feasible technical solution, the load sensor includes four strain gauge pressure sensors.

[0013] In a feasible technical solution, the strain gauge pressure sensor is arranged on the force-bearing surface of a column of the compound drive press.

[0014] In a feasible technical solution, the tonnage module is installed in a slave station box of the equipment.

[0015] In a feasible technical solution, the distributed I / O slave station is connected to the programmable controller via a PROFINET bus.

[0016] In a feasible technical solution, the human-computer interaction module is a touch screen.

[0017] In an achievable technical solution, the model of the programmable controller is SIMATIC S7-1500; the model of the distributed I / O slave station is SIMATIC ET200SP, and the distributed I / O slave station includes a 2-channel 2 / 4-wire analog module; the model of the load sensor is HELM HT400; and the model of the tonnage module is HELM PTM-1.

[0018] Compared with the prior art, the advantages and positive effects of this application are:

[0019] The utility model utilizes a load sensor to collect the force parameters of the compound drive press in real time, and then displays the pressurized tonnage of the compound drive press through a human-computer interaction module. At the same time, the tonnage module is used to analyze and judge the parameters. When an abnormality occurs, the human-computer interaction module is used to display an alarm message in time to prevent abnormal damage and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 The circuit diagram of the preferred embodiment of the utility model is as follows;

[0022] Figure 2 This is a schematic diagram of a tonnage module in a preferred embodiment of the utility model;

[0023] Figure 3 1 is a circuit diagram of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0025] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0026] See also Figures 1 to 3 , a compound drive press tonnage measurement system, comprising:

[0027] Programmable controller, used to control the working state of compound drive press;

[0028] A plurality of load sensors 300 are installed at key stress points of the compound drive press to obtain stress parameters of the compound drive press;

[0029] Tonnage module 200, for receiving output signals of load sensors;

[0030] and a distributed I / O slave station 100 for performing data transfer; wherein:

[0031] The load sensor is connected to the tonnage module via a cable, and the tonnage module is connected to the programmable controller via a distributed I / O slave station; the programmable controller is connected to the human-machine interaction module.

[0032] In this embodiment, the human-computer interaction module can select a touch screen with relatively mature technology;

[0033] The load sensor is a strain gauge pressure sensor, and the number can be four or other numbers.

[0034] The strain type pressure sensor is arranged on the force bearing surface of the column of the compound drive press.

[0035] The tonnage module is installed in the equipment slave station box.

[0036] The distributed I / O slave stations are connected to the programmable controller via the PROFINET bus.

[0037] The human-computer interaction module is a touch screen.

[0038] The model of the programmable controller is SIMATIC S7-1500; the model of the distributed I / O slave station is SIMATIC ET200SP, and the distributed I / O slave station includes a 2-channel 2 / 4-wire analog module; the analog module is a SIMATIC 6ES7134-6HB00-0CA1 analog input module.

[0039] Before stamping, the load sensor can be installed in the key stress area of ​​the compound drive press; during the stamping process, the sliding block squeezes the column and the fuselage to cause changes in their characteristics. The data output by the load sensor is processed by the tonnage module, and the real-time stamping tonnage can be directly displayed on the human-computer interaction module. When the tonnage is abnormal, the corresponding alarm can be output.

[0040] The model of the load sensor is HELM HT400;

[0041] The input signals of the load sensor are DC 24V power supply and external sampling signal.

[0042] The load sensor output signals include: DC 0-10V trace and peak voltage signal output.

[0043] The model of the tonnage module is HELM PTM-1;

[0044] The internal circuitry of the tonnage module includes signal filtering, amplification, calibration, auto zero and peak hold functions.

[0045] The programmable controller, distributed I / O slave station and human-machine interaction module are connected via PROFINET bus, and the distributed I / O slave station includes an analog input module.

[0046] Install the load sensor in the key stress-bearing area of ​​the press, such as the stress-bearing surface of the press column.

[0047] The utility model can directly display the real-time stamping tonnage on the human-machine interaction module, and can output corresponding overpressure and eccentric load alarms when the tonnage is abnormal. Specific embodiment:

[0049] This embodiment uses HELM HT400 load sensor and HELM PTM-1 tonnage module. The load sensor is installed in the key stress area of ​​the press column. The tonnage module is installed in the equipment slave box. The tonnage module is connected to the strain sensor through a matching cable, and then connected to the analog input module of the slave through a shielded cable. The slave is connected to the programmable controller and the human-computer interaction module through the PROFINET bus. During stamping, the load sensor produces mechanical deformation, resulting in a change in resistance. The tonnage module converts it into a voltage value corresponding to the tonnage, gives it to the analog input module channel, and outputs the corresponding tonnage and abnormal alarm through the human-computer interaction module.

[0050] 1. Hardware Configuration

[0051] After adding the Siemens distributed I / O station, add the analog input module and set the input measurement parameters for the analog channel. Select the measurement type "voltage" mode; select the measurement range "0-10V", and leave other parameters as default. Check the module's I / O address allocation information. The input address can be modified according to actual conditions. After the parameter settings are completed, the hardware configuration is completed.

[0052] It mainly processes the analog quantity output by the tonnage module and performs some alarm protection, etc., converts it into a readable tonnage value, and adds the sensor compensation factor that needs to be set when calibrating the tonnage. Set the tonnage compensation parameters and set the human-computer interaction module to facilitate the later tonnage calibration debugging and information display.

[0053] 2. Sensor and module installation and wiring

[0054] 1. Load sensor installation

[0055] The load sensor needs to be installed in the key stress area of ​​the machine tool to form a sensor monitoring system to detect the pressure output signal generated by the frame deformation. The following are the installation steps:

[0056] First, install a positioning block on the welding block and fix the welding block. After tightening the positioning block and welding block with screws, weld them to the machine column. Note that all four sides must be fully welded. The installation position is on the inside of the column, basically in the area between the upper die and the lower die. Each column is installed with a sensor. Then remove the positioning block, install the load sensor on the column, and tighten the mounting screws. And install the sensor cover to protect the sensor.

[0057] The wiring should be passed through a metal hose, and both ends of the metal hose should be equipped with pipe connectors to ensure that the hose is effectively grounded; when routing, avoid cables and wires with high current to prevent the sensor from being interfered by the high current; avoid routing in oily areas to avoid corrosion of wires and cables.

[0058] 2. Tonnage module installation

[0059] Install the tonnage module securely and safely on the rail in the slave control cabinet and keep it away from AC power, contactors, or motors to prevent these devices from interfering with the module.

[0060] Combination Figure 2 , Figure 3 As shown, connect the DC 24V power pins 2UV0 and 2M0 of the PLC analog input module to the +24V and 0V power terminals at the bottom of the tonnage module respectively to make the module work normally; connect the load sensor to the terminal in the middle of the tonnage module, which can be unplugged from the module. The sensor signals are +Gage and -Gage, +Signal and -Signal, and Shield respectively; connect the enable signal of tonnage measurement to the terminal +Cam at the bottom of the module as an external sampling signal. The output signal uses the two terminals Peak and Acom on the upper wiring terminal of the tonnage module, and connects the output DC 0-10V peak voltage signal to the U0+ and U0- pins of the PLC module input channel. The peak signal outputs the maximum value of the sensor sampling signal in each cycle, which is maintained until the end of this cycle and reset to zero when the sampling position starts in the next cycle.

[0061] 3. Tonnage calibration and debugging

[0062] 1. Initial Setup

[0063] Combination Figure 2 As shown in the figure, after the circuit is correctly connected, in order to obtain a more accurate signal output, the tonnage module needs to be initially set. When setting the parameters, the sensor needs to be kept without load and the external sampling input signal should be kept closed.

[0064] ⑴Zero point adjustment:

[0065] Step 1. Turn the gear switch to OFF;

[0066] Step 2. Use a multimeter to measure the zero\gain test points Track and Acom;

[0067] Step 3. Set the multimeter to the DC 20V position;

[0068] Step 4. Use a screwdriver to adjust the screw Balance under the gear switch until the multimeter reading reaches 0.00V;

[0069] Step 5. After adjustment, turn the gear switch to AZ position and monitor normally.

[0070] ⑵Gain adjustment:

[0071] Step 1. Turn the gear switch to CAL;

[0072] Step 2. Use a multimeter to measure the zero\gain test points Track and Acom;

[0073] Step 3. Set the multimeter to the DC 20V position;

[0074] Step 4. Use a screwdriver to adjust the Gain screw on the gear switch until the multimeter reading reaches 2.66V;

[0075] Step 5. After adjustment, turn the gear switch to AZ position and monitor normally;

[0076] 2. Preparation

[0077] Step 1. Fasten the sensors: the first channel (CH1) corresponds to the left front, the second channel (CH2) corresponds to the left rear, the third channel (CH3) corresponds to the right front, and the fourth channel (CH4) corresponds to the right rear.

[0078] Step 2. Check the clamping height of the press and prepare equal height pads.

[0079] Step 3. Prepare thin shims: During calibration, if the height is slightly inconsistent, you can use thin shims (the materials can be newspapers, cardboard, thin steel plates, etc.) to balance the four corners.

[0080] Step 4. Tonnage meter system wiring: Connect the system power line, alarm signal line, cam signal line, and sensor line to the tonnage meter.

[0081] 3. Calibration and debugging

[0082] After the zero point gain adjustment and preparation work of the tonnage module are completed, tonnage calibration and debugging are carried out.

[0083] Step 1. Place the height pad on the press workbench as required;

[0084] Step 2. Place the load cell on the height pad and confirm that the load cell is well connected to the calibration system;

[0085] Step 3. Adjust the mold closing height and move the inching slider downward so that the slider can contact the load cell at the bottom dead center;

[0086] Step 4. Adjust the slider and move it downward to increase the pressure. Check the stress of the load unit at each point to make the pressure deviation of the four corners within 10T. If the tonnage deviation is large, thin shims need to be used on the load unit for leveling correction.

[0087] Step 5. Change the proportional valve opening to make the press tonnage about 50% of the full load, record the sensor channel value and the tonnage meter display value at this time, and calculate the sensor factor as the reference value. Then continue to change the proportional valve opening value, and by setting the compensation number of the sensor at different stages, make the tonnage display value of the human-machine interface consistent with the actual value of the tonnage meter, and calibrate all other tonnages;

[0088] This completes the calibration.

[0089] After debugging, the tonnage is re-checked and the calibration value is consistent with the theoretical design value. The measurement system can effectively detect the stamping tonnage of the compound drive press and provide overload protection and unbalanced load protection for the press and mold to prevent abnormal damage and extend the service life.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A compound drive press tonnage measurement system, comprising a programmable controller for controlling the working state of the compound drive press; It is characterized in that Also includes: M load sensors (300) for obtaining force parameters of a compound drive press; M is a natural number greater than 0; A tonnage module (200) for receiving an output signal of a load sensor; and a distributed I / O slave station (100) for performing data transfer; wherein: The load sensor is connected to the tonnage module via a cable, and the tonnage module is connected to the programmable controller via a distributed I / O slave station; the programmable controller is connected to the human-machine interaction module.

2. The compound drive press tonnage measurement system according to claim 1, It is characterized in that The load sensor includes four strain gauge pressure sensors.

3. The compound drive press tonnage measurement system according to claim 2, It is characterized in that The strain type pressure sensor is arranged on the force bearing surface of the column of the compound drive press.

4. The compound drive press tonnage measurement system according to claim 1, It is characterized in that The tonnage module is installed in the equipment slave station box.

5. The compound drive press tonnage measurement system according to claim 1, It is characterized in that The distributed I / O slave stations are connected to the programmable controller via the PROFINET bus.

6. The compound drive press tonnage measurement system according to claim 1, It is characterized in that The human-computer interaction module is a touch screen.

7. The compound drive press tonnage measurement system according to claim 1, It is characterized in that The model of the programmable controller is SIMATIC S7-1500; the model of the distributed I / O slave station is SIMATIC ET200SP, which includes a 2-channel 2 / 4-wire analog module; the model of the load sensor is HELM HT400; and the model of the tonnage module is HELM PTM-1.

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