CN107244093B - Electrical control system and method for double-cylinder synchronous pressurization powder forming press - Google Patents
Electrical control system and method for double-cylinder synchronous pressurization powder forming press Download PDFInfo
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- CN107244093B CN107244093B CN201610531005.6A CN201610531005A CN107244093B CN 107244093 B CN107244093 B CN 107244093B CN 201610531005 A CN201610531005 A CN 201610531005A CN 107244093 B CN107244093 B CN 107244093B
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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
- B30B15/26—Programme control arrangements
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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
- B30B15/166—Electrical control arrangements
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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
- B30B15/22—Control arrangements for fluid-driven presses controlling the degree of pressure applied by the ram during the pressing stroke
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Abstract
The embodiment of the invention discloses an electric control system of a double-cylinder synchronous pressurization powder molding press, which comprises a control unit, a sensor unit and an execution valve unit, wherein the control unit is used for sending a control signal to the execution valve unit to control the pressurization of a first main hydraulic cylinder and a second main hydraulic cylinder, the lifting of a movable beam and the positioning of an ejection hydraulic cylinder. The embodiment of the invention also discloses an electrical control method of the double-cylinder synchronous pressurization powder molding press. The invention aims at adopting double oil cylinders to pressurize simultaneously, configuring two pressure sensors and carrying out averaging and filtering operation on the numerical values of the two pressure sensors, and improving the pressure control precision. When the sensor fails, a normal single sensor can be selected as pressure feedback, and the system redundancy is increased. Two cross beam displacement sensors are configured, and the values of the two cross beam displacement sensors are compared in real time, so that the situation that the working surface of the main oil cylinder is inclined but continues to be pressurized is avoided, and the performance of the pressed product is ensured.
Description
Technical Field
The invention relates to an electrical control system and method for a press, in particular to an electrical control system and method for a double-cylinder synchronous pressurizing powder forming press.
Background
The dry pressing powder forming hydraulic machine generally comprises a main body frame, a main oil cylinder, a movable cross beam, an ejection device and a pump station, the weight of the hydraulic machine is at least dozens of tons, individual machine types can reach 3 hundred tons, the hydraulic machine is core equipment in an automatic production line of a factory, the speed of pressing products is required to be high, the pressing is finished for 12 times per minute on average in normal production, the working time is long, the failure rate of equipment is low, the average time of the press needs to be more than 20 hours per day, the precision of product size requirement is high, the error generally does not exceed 0.2mm, the automation and intelligence levels are high, and an operator can start the hydraulic machine only through simple training, so the hydraulic machine has high technical requirements on matched electric control devices. Meanwhile, with the improvement of the recognition level and the adaptation to different requirements of pressed products, a plurality of special machine types are derived from the dry pressing powder forming hydraulic press, different specifications in size are subdivided under the same machine type, and the dry pressing powder forming hydraulic press can be generally divided into single-cylinder pressurization and double-cylinder synchronous pressurization according to the different configuration numbers of the main oil cylinders. Particularly, the core of dry pressing powder molding is the precise control of molding pressure, so that a set of novel adaptive electrical control device is very necessary to be developed for a special structural form of double-cylinder synchronous pressurization.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide an electrical control system of a double-cylinder synchronous pressurization powder molding press, aiming at a special structure adopting double oil cylinders for simultaneous pressurization, 2 pressure sensors are configured on hardware, averaging and filtering operation is performed in control, pressure sampling error is reduced, and pressure control precision is improved. When a sensor fault occurs, a normal single sensor can be selected as pressure feedback instead, and the redundancy of the system is increased. Two beam displacement sensors are configured to perform averaging and filtering operation on pressure acquisition values, so that sampling errors are reduced, and pressure control precision is improved. When a sensor fault occurs, a single sensor can be selected as pressure feedback, and the system redundancy is increased. Two beam displacement sensors are configured, and the values of the two displacement sensors are compared in real time, so that the situation that the working surface of the main oil cylinder is inclined but continues to be pressurized is effectively avoided, the main oil cylinder is protected, and the overall performance of a product is ensured.
In order to solve the above technical problems, an embodiment of the present invention provides an electrical control system for a double-cylinder synchronous pressing powder forming press, comprising a control unit, a sensor unit and an execution valve unit,
the sensor unit comprises a first main cylinder pressure sensor, a second main cylinder pressure sensor, a first cross beam displacement sensor, a second cross beam displacement sensor and an ejection displacement sensor;
the control valve unit comprises a main cylinder pressure proportional valve, a cross beam proportional valve and an ejection servo valve;
the control unit sends control signals to the control valve unit according to input control instructions and feedback signals of the sensor unit, so that accurate pressurization of the first main hydraulic cylinder and the second main hydraulic cylinder, soft lifting of the movable cross beam and accurate positioning of the ejection hydraulic cylinder are achieved.
As an improvement of the above scheme, the electric control system of the double-cylinder synchronous pressurization powder molding press further comprises a storage unit, and the storage unit is used for storing the feedback numerical values of the first main cylinder pressure sensor and the second main cylinder pressure sensor at intervals of preset time.
As a modification of the above, the control unit may determine whether the latest values fed back by the first and second master cylinder pressure sensors are wrong or not, based on the values stored in the storage unit.
As an improvement of the above scheme, the control unit can arithmetically compare feedback values of the first beam displacement sensor and the second beam displacement sensor, so as to judge whether the working surface of the master cylinder inclines or not.
As an improvement of the scheme, the control unit can respectively provide an open-loop control mode and a closed-loop control mode aiming at the movement of the cross beam and the pressurization of the main cylinder, and the requirements of pressing processes of different products are met.
As an improvement of the scheme, a high-precision SSI displacement sensor is used for feedback, a high-performance PLC is used as a control unit, a high-performance servo valve is used as an execution unit, and a special PID algorithm is operated, so that the accuracy of ejection positioning is guaranteed to the greatest extent.
Correspondingly, the embodiment of the invention also provides an electrical control method of the double-cylinder synchronous pressurization powder molding press, the electrical control system of the double-cylinder synchronous pressurization powder molding press controls the press, and the control unit sends control signals to the control valve unit according to input control instructions, a control program input in advance and feedback signals of the sensor unit to control the actions of the first main hydraulic cylinder, the second main hydraulic cylinder, the cross beam and the ejection hydraulic cylinder.
As an improvement of the above, the control unit averages the feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor as a main parameter of the pressing pressure.
As an improvement of the above scheme, the storage unit samples and stores feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor at predetermined time intervals; and comparing the feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor with historical values in the storage unit each time when the feedback values are acquired, and judging that the sensor has a fault and giving an alarm when the difference between the current value and the historical value is greater than a preset value.
As an improvement of the scheme, when the control unit judges that one of the first master cylinder pressure sensor and the second master cylinder pressure sensor has a fault, the fault pressure sensor is automatically shielded, and the normal pressure sensor value is used as a main parameter of the pressing pressure to continue operation.
As a modification of the above-described aspect, when the control unit determines that one of the first and second master cylinder pressure sensors is malfunctioning, the user is allowed to manually designate one of them as a main parameter of the pressing pressure and shield the other sensor.
The embodiment of the invention has the following beneficial effects:
the invention provides an electrical control system of a double-cylinder synchronous pressurization powder molding press, which aims at a special structure that double oil cylinders are adopted for simultaneous pressurization, two pressure sensors are configured on hardware, averaging and filtering operation is carried out in control, pressure sampling errors are reduced, and pressure control precision is improved. When a sensor fault occurs, a normal single sensor can be selected as pressure feedback instead, and the redundancy of the system is increased. The values of the two cross beam displacement sensors are compared, so that the situation that the working surface of the main oil cylinder is inclined but continues to be pressurized is effectively avoided, the main oil cylinder is protected, and the overall performance of a product is ensured.
Drawings
FIG. 1 is an electrical connection diagram of an electrical control system of a double-cylinder synchronous pressing powder forming press;
FIG. 2 is a control schematic diagram of an electrical control system of a double-cylinder synchronous pressing powder molding press;
fig. 3 is a process diagram corresponding to an electrical control system of a double-cylinder synchronous pressing powder forming press.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides an electrical control system for a double-cylinder synchronous pressing powder forming press, which includes a control unit, a sensor unit and a control valve unit.
The sensor unit comprises a first main cylinder pressure sensor (namely a main cylinder pressure sensor 1 in the attached drawing), a second main cylinder pressure sensor (namely a main cylinder pressure sensor 2 in the attached drawing), a first cross beam displacement sensor (namely a cross beam displacement sensor 1 in the attached drawing), a second cross beam displacement sensor (namely a cross beam displacement sensor 2 in the attached drawing) and a push-out displacement sensor (namely a push-out SSI displacement sensor in the attached drawing); they are provided on the corresponding first master cylinder (i.e., the main hydraulic cylinder 1 in the drawing), second master cylinder (i.e., the main hydraulic cylinder 2 in the drawing), cross member, and ejection mechanism. The control unit can adopt CX1010 PLC of Beifu corporation as a control core to control input and output quantity, and the human-computer interface can adopt HaKKo touch screen of Fuji corporation to display and input parameters; the first master cylinder pressure sensor and the second master cylinder pressure sensor can adopt HYDAC digital pressure sensors and are used for detecting master cylinder pressure; the first beam displacement sensor and the second beam displacement sensor can adopt a magnetostrictive non-contact analog quantity displacement sensor of MTS company and are used for detecting the position of the beam in real time; the ejection displacement sensor can adopt a magnetostrictive non-contact SSI displacement sensor manufactured by MTS company and is used for detecting the ejection position in real time.
The control valve unit comprises a main cylinder pressure proportional valve, a cross beam proportional valve and an ejection servo valve; the main cylinder pressure proportional valve and the cross beam proportional valve can adopt ATOS company large-diameter proportional valves and are used for pressurization and pressure relief of the main cylinder and lifting control of the cross beam; the ejection servo valve can adopt a large-drift-diameter servo valve of MOOG company, so that the ejection mechanism can be accurately positioned.
The control unit sends control signals to the control valve unit according to input control instructions and feedback signals of the sensor unit, and controls the actions of the first main hydraulic cylinder, the second main hydraulic cylinder, the beam hydraulic cylinder and the ejection hydraulic cylinder. For example, when a user inputs a control command for the master cylinder pressurization or presses a button for the master cylinder pressurization, the control unit sends a control signal for opening the control valve unit to open the master cylinder pressure proportional valve, the first master cylinder and the second master cylinder start charging pressurization, and when the master cylinder pressure signal fed back by the sensor unit reaches a predetermined value, the control unit sends a control signal for closing the control valve unit to close the master cylinder pressure proportional valve, and the first master cylinder and the second master cylinder stop charging pressurization.
The invention provides an electric control system of a double-cylinder synchronous pressurizing powder molding press, which aims at a special structure that double oil cylinders are adopted for pressurizing simultaneously, two pressure sensors are arranged on hardware, averaging and filtering operation is carried out in control, pressure sampling errors are reduced, and pressure control precision is improved. When a sensor fault occurs, a normal single sensor can be selected as pressure feedback instead, and the redundancy of the system is increased.
Preferably, the electric control system of the double-cylinder synchronous pressurizing powder forming press further comprises a storage unit, and the storage unit is used for storing the feedback values of the first main cylinder pressure sensor and the second main cylinder pressure sensor at intervals of preset time. The control unit can judge whether the latest values fed back by the first master cylinder pressure sensor and the second master cylinder pressure sensor are wrong or not according to the values stored in the storage unit.
Preferably, the electric control system of the double-cylinder synchronous pressurizing powder forming press can respectively provide open-loop and closed-loop control modes for lifting movement of the cross beam and pressurization of the main cylinder so as to meet different process requirements.
Preferably, the electrical control system of the double-cylinder synchronous pressurizing powder molding press adopts a high-precision SSI displacement sensor as feedback, and adopts a PID algorithm to control servo ejection in a closed loop mode.
Correspondingly, the embodiment of the invention also provides an electrical control method of the double-cylinder synchronous pressurizing powder molding press.
The hydraulic press pressing process flow is briefly described, and as shown in fig. 3, the process can be divided into 12 steps in sequence:
(1) descending filler of an ejection mechanism (2) a crossbeam descends- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (3) a main cylinder once low pressure is- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (5) main cylinder 5) secondary air is- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Firstly, an ejection mechanism descends to form a fixed material distribution die cavity, raw materials are put in through the material distribution mechanism, after the material distribution mechanism returns to a safe rear position, a cross beam drives a main cylinder to descend, after the main cylinder reaches the position contacting with the raw materials, the main cylinder starts to firstly add low pressure, the main cylinder releases pressure after the pressure is reached, the main cylinder lifts for a short distance, the cross beam descends after the exhaust is completed, the main cylinder starts to add high pressure for the third time, after the set high pressure is reached, the main cylinder starts to maintain the pressure for a set time and then releases the pressure, when the pressure release time is reached, the cross beam ascends, an ejection device ejects a brick blank, when the cross beam ascends to an automatic high position and completely ejects the brick blank, the brick blank enters a circulation delay to wait, and the next circulation action is prepared.
The key points in the process are the control of the main cylinder displacement and pressure in the main cylinder pressurization process and the accurate movement control of the cross beam and the ejection device. Therefore, the method is mainly used for accurately controlling the pressure of the double master cylinders, and the operation reliability and the redundancy of the system are improved.
The electric control method of the double-cylinder synchronous pressurization powder molding press is characterized in that the electric control system of the double-cylinder synchronous pressurization powder molding press is adopted to control the press, and the control unit sends control signals to the control valve unit according to input control instructions, pre-input control programs and feedback signals of the sensor unit to control the actions of the first main hydraulic cylinder, the second main hydraulic cylinder, the cross beam and the ejection hydraulic cylinder. Under normal working conditions, the control unit takes the average of feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor as a main parameter of the pressing pressure.
Preferably, the storage unit samples and stores feedback values of the first and second master cylinder pressure sensors at predetermined intervals; when feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor are obtained each time, whether the values are in a reasonable range or not is preliminarily judged, then the values are compared with historical values in the storage unit, and when the difference between the existing values and the historical values is larger than a preset value, the sensor is judged to be in fault, and an alarm is given.
According to one embodiment of the present invention, when the control unit determines that one of the first and second master cylinder pressure sensors is malfunctioning, the control unit automatically shields the malfunctioning pressure sensor and continues the operation with the normal pressure sensor value as the main parameter of the pressing pressure.
It should be noted that, this method is used in the situation that the production cannot be stopped immediately due to reasons such as production, and the master cylinder pressure used as a reference is the pressure feedback of one of the two master cylinders, and is only used as an emergency means, when the situation allows, the cause of the fault should be found immediately, and the production is restarted after the fault is removed.
According to another embodiment of the present invention, when the control unit determines that one of the first and second master cylinder pressure sensors is malfunctioning, the user is allowed to manually designate one of them as a main parameter of the pressing pressure and shield the other sensor.
It should be noted that the difference between this embodiment and the first embodiment is that when the sensor fails, the system will automatically stop and send an alarm, and at this time, the user may restart the system after removing the failure, or manually designate the normal pressure sensor as the main parameter of the pressing pressure and continue to operate.
The invention provides an electric control method of a double-cylinder synchronous pressurization powder molding press, which aims at a special structure that double oil cylinders are adopted for pressurization simultaneously, two pressure sensors are arranged on hardware, averaging and filtering operation is carried out in control, pressure sampling errors are reduced, and pressure control precision is improved. When the sensor fails, a normal single sensor can be selected as pressure feedback instead, and the redundancy of the system is increased.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. An electric control system of a double-cylinder synchronous pressurizing powder molding press comprises a control unit, a sensor unit, a storage unit and an execution valve unit, and is characterized in that,
the sensor unit comprises a first main cylinder pressure sensor, a second main cylinder pressure sensor, a first cross beam displacement sensor, a second cross beam displacement sensor and an ejection displacement sensor which are correspondingly arranged on the first main cylinder, the second main cylinder, the cross beam and the ejection mechanism; the first main cylinder pressure sensor is used for detecting the pressure of a first main cylinder, the second main cylinder pressure sensor is used for detecting the pressure of a second main cylinder, the first cross beam displacement sensor and the second cross beam displacement sensor are used for detecting the position of a cross beam in real time, and the ejection displacement sensor is used for detecting the ejection position in real time;
the execution valve unit comprises a main cylinder pressure proportional valve, a cross beam proportional valve and an ejection servo valve, the main cylinder pressure proportional valve is used for pressurizing and releasing the main cylinder, the cross beam proportional valve is used for controlling the lifting of the cross beam, and the ejection servo valve is used for positioning the ejection mechanism;
the control unit comprises a programmable controller PLC and a human-computer interface HMI; the programmable logic controller PLC is used as a control core for controlling input and output quantity, and the human-computer interface HMI is used for displaying and inputting parameters;
the control unit sends control signals to the execution valve unit according to input control instructions and feedback signals of the sensor unit, and controls the first main hydraulic cylinder, the second main hydraulic cylinder to pressurize and move the cross beam and the ejection hydraulic cylinder;
the storage unit is used for storing the feedback numerical values of the first master cylinder pressure sensor and the second master cylinder pressure sensor at intervals of preset time.
2. The electrical control system of the double-cylinder synchronous pressing powder forming press according to claim 1, wherein the control unit is capable of judging whether the latest values fed back by the first and second master cylinder pressure sensors are wrong according to the values stored in the storage unit.
3. The electrical control system of claim 1, wherein the control unit is capable of arithmetically comparing feedback values of the first beam displacement sensor and the second beam displacement sensor to determine whether the working surface of the master cylinder is tilted.
4. The dual cylinder synchronous compression powder forming press electrical control system of claim 1, wherein the beam movement and the master cylinder compression provide open loop and closed loop control modes, respectively.
5. An electrical control method for a double-cylinder synchronous pressing powder molding press, which controls the press through the electrical control system of the double-cylinder synchronous pressing powder molding press as claimed in any one of claims 1 to 4, wherein the control unit sends control signals to the execution valve unit according to the input control command, the control program input in advance and the feedback signals of the sensor unit, and controls the first main hydraulic cylinder, the second main hydraulic cylinder to press, the beam and the ejection hydraulic cylinder to move.
6. The electrical control method of the double-cylinder synchronous pressing powder forming press according to claim 5, wherein the control unit averages the feedback values of the first and second master cylinder pressure sensors as the main parameter of the pressing pressure.
7. The electrical control method of the double-cylinder synchronous pressing powder forming press as claimed in claim 6,
the storage unit samples and stores feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor at intervals of preset time; and comparing the feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor with historical values in the storage unit each time when the feedback values of the first master cylinder pressure sensor and the second master cylinder pressure sensor are obtained, and judging that the master cylinder pressure sensor has a fault when the difference between the current value and the historical value is greater than a preset value, and giving an alarm.
8. The electrical control method of the double-cylinder synchronous pressing powder molding press according to claim 7, wherein when the control unit determines that one of the first and second master cylinder pressure sensors is out of order, the failed master cylinder pressure sensor is automatically shielded, and the normal master cylinder pressure sensor value is used as a main parameter of the pressing pressure to continue the operation.
9. The electrical control method of the double-cylinder synchronous pressing powder molding press according to claim 7, wherein when the control unit determines that one of the first and second master cylinder pressure sensors is malfunctioning, the user is allowed to manually designate one of them as a main parameter of the pressing pressure and shield the other master cylinder pressure sensor.
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| CN109203555B (en) * | 2018-10-25 | 2020-07-03 | 扬力集团股份有限公司 | Double-cylinder hydraulic ejection control system and method thereof |
| CN110126342B (en) * | 2019-05-17 | 2021-06-08 | 天津市天锻压力机有限公司 | Process control system and control method of semi-continuous electrode hydraulic press |
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| BE1018410A3 (en) * | 2008-12-09 | 2010-10-05 | Robosoft Nv | METHOD OF SAFETY AND CONTROL CONTROL OF A HYDRAULIC PRESS, HYDRAULIC PRESS WORKING IN ACCORDANCE WITH THIS METHOD AND USING SOFTWARE AND CARRIER |
| CN102797716B (en) * | 2012-08-29 | 2015-06-24 | 绍兴文理学院 | Hydraulic system of vertical numerical control spinning machine |
| CN105346531B (en) * | 2015-11-04 | 2018-02-13 | 浙江万向精工有限公司 | Collect master cylinder line control brake system in pairs |
| CN206644375U (en) * | 2016-07-07 | 2017-11-17 | 佛山市恒力泰机械有限公司 | A kind of two-tank method pressurized powder moulding press electric control system |
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