CN104977954A - Ceramic brick machine speed and position double closed-loop control method - Google Patents
Ceramic brick machine speed and position double closed-loop control method Download PDFInfo
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Abstract
A ceramic brick machine speed and position double closed-loop control method comprises the following steps: establishing a speed control closed loop according to the current speed of a moving beam to control the speed of the moving beam in real time; establishing a position control closed loop according to the current position of the moving beam to realize positioning of the moving beam; and controlling the running speed of the moving beam with the speed closed loop and controlling the moving beam to move to the required position with the position control closed loop. In the moving beam operation process, the speed in the whole course is in closed-loop control, the whole operation process is very smooth, speed switching is more smooth, the problems of segmentation, overshoot, pre-decelerating time lengthening and the like are no longer the case, no abrupt change output occurs and a proportional valve can be protected better. When the moving beam brakes, the position closed loop control is adopted, so that the control precision is improved greatly, and the repetition accuracy is quite good. The whole operating speed of a brick machine is improved, and the whole performance is improved obviously. The ceramic brick machine speed and position double closed-loop control method is simple in structure, high in flexibility and adaptability and convenient and simple to use, and improves the product quality, precision and performance greatly.
Description
Technical field
The present invention relates to and be applied to ceramic brick press, particularly the motion control method of the dynamic beam of ceramic brick press.
Background technology
The ceramic brick press of prior art is by hydraulic-driven, sends the electric signal of certain voltage particular by controller to proportioning valve, the aperture of control ratio valve thus the size of hydraulic control.Please refer to Fig. 1, the primary structure of brick machine is beam 11 and framed 12, moves and is placed with powder to be pressed between beam 11 and framed 12, and dynamic beam 11 upper end is connected with fluid, thus produces hydraulic pressure, runs to drive dynamic beam 11.
Ceramic brick press control system also well known at present generally adopts common PLC to control the action of press, and overall control thinking, as Fig. 2, comprises the steps:
D1: the dynamic beam controlling ceramic brick press runs.
D2: the value reading displacement transducer.
D3: judge the stage residing for dynamic beam according to the value of displacement transducer; If current dynamic beam is in start region of starting to walk, then jump to step D4; If current dynamic beam is in fast moving areas, then jump to step D5; If current dynamic beam is in normal danger region, then jump to step D6.
D4: the starting voltage exporting 0-10V to hydraulic proportion valve.
D5: the quick voltage exporting 0-10V to hydraulic proportion valve.
D6: the brake voltage exporting 0-10V to hydraulic proportion valve.
This control model gathers the real time position that current press moves beam to judge which stage dynamic beam is according to dynamic beam real time position again to PLC, PLC, then carried out the aperture of the dynamic beam proportioning valve exporting setting by analog output module.
This known position control technology to be applied on ceramic brick press for many years, is also very successful.But there is following shortcoming in this technology: 1, these position-detection sensors are all analog quantity forms, in the work on the spot environment of ceramic brick press, analog quantity be disturbed and affect a lot of because have, these position transducers are easy to be interfered and cause the data of input PLC inaccurate; 2, control method is fairly simple, according to different position sections, export different analog quantitys and carry out hydraulic control proportioning valve, this is for the motion of big article, easily cause subsection efect, and be limited by the situation of the air pressure instability of top tank, the repeatability precision that Discrete control exports the dynamic beam motion caused is not high; 3, segmentation exports hydraulic control proportioning valve, and neither one transition between large aperture and small guide vane, easily causes the damage of hydraulic proportion valve working time for a long time.4, segmentation exports and controls to be difficult to grasp the real-time speed (mm/s) that press moves beam, requires higher, easily cause adobe defective to operator and powder.
Generally speaking, used according to position carry out segmentation export analog quantity there is a lot of problems to proportioning valve, be difficult to the repeatable accuracy ensureing that dynamic beam runs, the overall performance of press is not high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, for ceramic brick press provides a new control theory, a kind of ceramic brick press velocity location double-closed-loop control method, thus solve the poor anti jamming capability that existing control system exists, the problem that repeatable accuracy is not high, control accuracy is not high, control performance is poor.
In order to achieve the above object, the present invention is by the following technical solutions: comprise the following steps:
Step one: initial position and the target location of presetting the dynamic beam of ceramic brick press, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1; Preset the acceleration a1 of this dynamic beam, fast travelling speed Vs and retarded velocity a2;
Step 2: the beginning normal danger calculating this dynamic beam, its absolute displacement values L2=L1-Vs
2/ a2;
Step 3: transmit control signal to proportioning valve, control brake beam runs with acceleration a1;
Step 4: measure the present speed of this dynamic beam and compare with described quick travelling speed Vs, judges whether the present speed of this dynamic beam reaches quick travelling speed Vs, if yes, then enters step 5; Otherwise jump to step 3;
Step 5: the present speed measuring this dynamic beam, using quick travelling speed Vs as input, using present speed as feedback, carries out PID(proportion integralderivative, proportion integration differentiation according to the error between input and feedback) computing;
Step 6: to the speed control signal of proportioning valve stable output, by the velocity-stabilization of dynamic beam at Vs;
Step 7: measure the current location of this dynamic beam and compare with described beginning normal danger, judges whether this dynamic beam has arrived beginning normal danger, if yes, then enters step 8, otherwise jumps to step 5;
Step 8: transmit control signal to proportioning valve, control brake beam runs with retarded velocity a2;
Step 9: measure the present speed of this dynamic beam and judge whether the present speed of this dynamic beam reaches zero, if yes, then method ends; Otherwise jump to step 8.
Compared to prior art, a kind of ceramic brick press velocity location double-closed-loop control method creates a speeds control closed loop to control the speed of brake beam in real time according to the present speed of dynamic beam, the location of position-force control realization to dynamic beam is created according to the current location of dynamic beam, move the travelling speed of beam with velocity close-loop control, move beam with position-force control and run the position that will arrive.In dynamic beam operational process, because the atmospheric pressure difference of inertia and top tank causes the instability of speed all can utilize speed closed loop to control, speed closed loop ensure that the operation of dynamic beam stabilized speed, the synchronization action of dynamic beam and liftout attachment can be ensured like this, better can ensure the qualification rate of adobe, avoid dynamic beam speed that the unreasonable situation causing efficiency to reduce is set simultaneously.Omnidistance velocity close-loop control in dynamic beam operational process; the whole service process of dynamic beam is all very steady; and the switching of speed also can be more level and smooth, controls the problem such as segmentation, overshoot, the lengthening of pre-decelerating time embodied before no longer including, export without sudden change and also can better protect proportioning valve.In addition, because what adopt when the brake of dynamic beam is position-force control, control accuracy improves a lot, and repeatable accuracy is also fine.The overall operation speed of press increases, and overall performance has obvious lifting.Structure of the present invention is simple, has stronger dirigibility and adaptability, uses simple and convenient, and large step improves product quality, precision and performance.
Further, in step 4, detected the position of dynamic beam in real time by a displacement transducer, and the present speed that derived function obtains dynamic beam is carried out to the position of dynamic beam; In step 7, directly measured the current location of dynamic beam by institute's displacement sensors; In step 9, detected the position of dynamic beam in real time by institute's displacement sensors, and the present speed that derived function obtains dynamic beam is carried out in the position of dynamic beam.The present invention utilizes same displacement transducer to carry out position-force control, velocity close-loop control, simple in structure, but have basic change on controlling, control to have used 2 kinds of closed loop control methods at the dynamic beam of a ceramic brick press, the action of control brake beam can better be gone, control more stable, accurate.
Further, the displacement transducer in step 4, step 7 and step 9 is SSI(SynchronousSerial Interface, synchronous serial interface) displacement transducer.Have employed SSI displacement transducer to the detection of dynamic beam position, position signalling is all gray code format before being input to PLC, and in transmitting procedure, antijamming capability is strong, decreases in usually using many because disturb the problems caused.
Another object of the present invention is to provide a kind of ceramic brick press velocity location double-closed-loop control device, and it comprises storage element, the first computing unit, accelerates control module, the first judging unit, the second computing unit, speed stabilizing control module, the second judging unit, speed reduction control unit and the 3rd judging unit;
Described storage element stores the initial position of the dynamic beam of the ceramic brick press preset, target location, beginning normal danger, acceleration a1, fast travelling speed Vs, retarded velocity a2, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1;
Described first computing unit is calculated the beginning normal danger of this dynamic beam and is stored by storage element, wherein: the absolute displacement values L2=L1-Vs starting normal danger
2/ a2;
Described acceleration control module receives the work order of described first judging unit and transmits control signal to proportioning valve, and control brake beam is with acceleration a1 Accelerating running;
Described first judging unit judges the present speed of this dynamic beam measured; When the present speed of this measured dynamic beam does not reach quick travelling speed Vs, this first judging unit sends work order to acceleration control module;
Described second computing unit, using quick travelling speed Vs as input, using present speed as feedback, carries out pid calculation according to the error between input and feedback and result is sent to described speed stabilizing control module;
Described speed stabilizing control module receives the work order of described second judging unit with the result of calculation of described second computing unit and transmits control signal to proportioning valve, and the travelling speed controlling brake beam is stabilized in Vs;
Described second judging unit judges present speed and the current location of this measured dynamic beam simultaneously; When the present speed of this measured dynamic beam has reached quick travelling speed Vs and the current location working as this measured dynamic beam does not arrive beginning normal danger, this second judging unit sends work order to this speed stabilizing control module;
Described speed reduction control unit receives the work order of described 3rd judging unit and transmits control signal to proportioning valve, and control brake beam runs slowly with retarded velocity a1;
Described 3rd judging unit judges present speed and the current location of this dynamic beam measured; Start normal danger when the non-vanishing and current location working as this measured dynamic beam of the present speed of this measured dynamic beam has arrived or exceeded this, then send work order to this speed reduction control unit.
Compared to prior art, a kind of ceramic brick press velocity location double-closed-loop control device creates a speeds control closed loop to control the speed of brake beam in real time according to the present speed of dynamic beam, the location of position-force control realization to dynamic beam is created according to the current location of dynamic beam, move the travelling speed of beam with velocity close-loop control, move beam with position-force control and run the position that will arrive.In dynamic beam operational process, because the atmospheric pressure difference of inertia and top tank causes the instability of speed all can utilize speed closed loop to control, speed closed loop ensure that the operation of dynamic beam stabilized speed, the synchronization action of dynamic beam and liftout attachment can be ensured like this, better can ensure the qualification rate of adobe, avoid dynamic beam speed that the unreasonable situation causing efficiency to reduce is set simultaneously.Omnidistance velocity close-loop control in dynamic beam operational process; the whole service process of dynamic beam is all very steady; and the switching of speed also can be more level and smooth, controls the problem such as segmentation, overshoot, the lengthening of pre-decelerating time embodied before no longer including, export without sudden change and also can better protect proportioning valve.In addition, because what adopt when the brake of dynamic beam is position-force control, control accuracy improves a lot, and repeatable accuracy is also fine.The overall operation speed of press increases, and overall performance has obvious lifting.Structure of the present invention is simple, has stronger dirigibility and adaptability, uses simple and convenient, and large step improves product quality, precision and performance.
Accompanying drawing explanation
Fig. 1 is the operating diagram of a kind of ceramic brick press of prior art
Fig. 2 is a kind of method flow diagram controlling ceramic brick press of prior art
Fig. 3 is the process flow diagram of a kind of ceramic brick press velocity location double-closed-loop control method of the present invention
Fig. 4 is travelling speed and the displacement time history plot of dynamic beam in Fig. 3
Fig. 5 is the structured flowchart of a kind of ceramic brick press velocity location double-closed-loop control device of the present invention
Referring to drawings and the specific embodiments, the invention will be further described.
Embodiment
Refer to Fig. 3, it is the process flow diagram of a kind of ceramic brick press velocity location double-closed-loop control method of the present invention, and it comprises the steps:
S1: initial position and the target location of presetting the dynamic beam of ceramic brick press, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1; Preset the acceleration a1 of this dynamic beam, fast travelling speed Vs and retarded velocity a2.
S2: the beginning normal danger calculating this dynamic beam, its absolute displacement values L2=L1-Vs
2/ a2.
S3: transmit control signal to proportioning valve, control brake beam runs with acceleration a1.
S4: measure the present speed of this dynamic beam and compare with described quick travelling speed Vs, judges whether the present speed of this dynamic beam reaches quick travelling speed Vs, if yes, then enters step S5; Otherwise jump to step S3.When dynamic beam setting in motion, be in the starting stage, acceleration according to setting accelerates, real-time judge is moved beam present speed and whether is reached quick travelling speed (mm/s), the handoff procedure of its target velocity is by even acceleration or parabolic curve variation, avoids jumping characteristic to change the infringement of comparative example valve.
S5: the present speed measuring this dynamic beam, using quick travelling speed Vs as input, using present speed as feedback, carries out PID(proportion integralderivative, proportion integration differentiation according to the error between input and feedback) computing.
S6: to the speed control signal of proportioning valve stable output, by the velocity-stabilization of dynamic beam at Vs.Dynamic beam runs subordinate phase, is in the stable quick travelling speed stage, application speed closed-loop control.Real-time judge moves beam present speed (mm/s), when no matter dynamic beam rises top tank air pressure increase and move beam downward time top tank air pressure reduce, and the inertia effect of dynamic beam, all rely on the speed closed loop of foundation, take setting speed as input, speed that position differentiate obtains is read in for feedback with the sensor detected in real time, and with reference to dynamic curve between beam travelling speed and proportioning valve aperture, PID arithmetic is carried out according to the error between input and feedback, the output of control ratio valve, reaches dynamic beam with the object of stabilized speed.
S7: measure the current location of this dynamic beam and compare with described beginning normal danger, judges whether this dynamic beam has arrived beginning normal danger, if yes, then enters step S8, otherwise jumps to step S5.
S8: transmit control signal to proportioning valve, control brake beam runs with retarded velocity a2.
S9: measure the present speed of this dynamic beam and judge whether the present speed of this dynamic beam reaches zero, if yes, then method ends; Otherwise jump to step S8.Dynamic beam runs the phase III, application site closed loop.PLC is according to the retarded velocity of setting, judge the time and the displacement that decelerate to static needs with rapid pace, utilize displacement transducer to detect dynamic beam position, the target location reached according to dynamic Liang Suoyao deducts dynamic beam brake displacement and just can determine that dynamic beam starts the position of brake deceleration.Because dynamic beam quality is large, inertia is very large, but utilizing position closed loop to calculate can allow beam stop fast and not obvious vibration.
As shown in Figure 4, it is travelling speed and the displacement time history plot of dynamic beam in Fig. 3, and wherein V-t curve is the time dependent curve of the travelling speed of beam, and S-t is the time dependent curve of the displacement of beam.
In the present invention, the travelling speed of dynamic beam is linearly corresponding with proportioning valve aperture.In actual applications: are all velocity amplitudes to dynamic beam operational factor, not spend the aperture considering proportioning valve be how many just can reach required speed.Speed closed loop program in control can be write in the process function part of Siemens sports type CPU.In dynamic beam operational process, because the atmospheric pressure difference of inertia and top tank causes the instability of speed all can utilize speed closed loop to control, position closed loop during final location, is used to reach accurate positioning, velocity-stabilization.Shown in the dynamic travelling speed of beam and the following form of actual aperture corresponding relation curve of proportioning valve (threeway):
| Dynamic beam speed (mm/s) | Proportioning valve aperture (%) |
| 400 | 100 |
| 0 | 0 |
| -400 | -100 |
In the present embodiment, in step s 4 which, detected the position of dynamic beam in real time by a displacement transducer, and the present speed that derived function obtains dynamic beam is carried out to the position of dynamic beam; In the step s 7, the current location of dynamic beam is directly measured by institute's displacement sensors; In step s 9, detected the position of dynamic beam in real time by institute's displacement sensors, and the present speed that derived function obtains dynamic beam is carried out in the position of dynamic beam.Institute's displacement sensors is preferably SSI displacement transducer.SSI(Synchronous SerialInterface be have employed to the detection of dynamic beam position, synchronous serial interface) displacement transducer, position signalling is all gray code format before being input to PLC, in transmitting procedure, antijamming capability is strong, decreases in usually using many because disturb the problems caused.
Refer to Fig. 5, it is the structured flowchart of a kind of ceramic brick press velocity location double-closed-loop control device of the present invention, and it comprises storage element 1, first computing unit 2, accelerates control module 3, first judging unit 4, second computing unit 5, speed stabilizing control module 6, second judging unit 7, speed reduction control unit 8 and the 3rd judging unit 9.
Described storage element 1 stores the initial position of the dynamic beam of the ceramic brick press preset, target location, beginning normal danger, acceleration a1, fast travelling speed Vs, retarded velocity a2, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1.
Described first computing unit 2 is calculated the beginning normal danger of this dynamic beam and is stored by storage element 1, wherein: the absolute displacement values L2=L1-Vs starting normal danger
2/ a2.
Described acceleration control module 3 receives the work order of described first judging unit 4 and transmits control signal to proportioning valve, and control brake beam is with acceleration a1 Accelerating running.
Described first judging unit 4 judges the present speed of this dynamic beam measured; When the present speed of this measured dynamic beam does not reach quick travelling speed Vs, this first judging unit 4 sends work order to acceleration control module 3.
Described second computing unit 5, using quick travelling speed Vs as input, using present speed as feedback, carries out pid calculation according to the error between input and feedback and result is sent to described speed stabilizing control module 6.
Described speed stabilizing control module 6 receives the work order of described second judging unit 7 and the result of calculation of described second computing unit 5 and transmits control signal to proportioning valve, and the travelling speed of control brake beam is stabilized in Vs.
Described second judging unit 7 judges present speed and the current location of this dynamic beam measured simultaneously; When the present speed of this measured dynamic beam has reached quick travelling speed Vs and the current location working as this measured dynamic beam does not arrive beginning normal danger, this second judging unit 7 sends work order to this speed stabilizing control module 6.
Described speed reduction control unit 8 receives the work order of described 3rd judging unit 9 and transmits control signal to proportioning valve, and control brake beam runs slowly with retarded velocity a1.
Described 3rd judging unit 9 judges present speed and the current location of this dynamic beam measured; Start normal danger when the non-vanishing and current location working as this measured dynamic beam of the present speed of this measured dynamic beam has arrived or exceeded this, then send work order to this speed reduction control unit 8.
The complete course of work is as follows: when the present speed of dynamic beam does not reach quick travelling speed Vs, and the first judging unit 4 judges that dynamic beam is in the starting stage, accelerates control module 3 and transmits control signal to proportioning valve, and control brake beam runs with described acceleration a1; When the present speed of dynamic beam reach quick travelling speed Vs and the current location of this dynamic beam do not arrive start normal danger time, second judging unit 7 judges that dynamic beam is in the quick operation phase, the result of PID arithmetic is sent to speed stabilizing control module 6 by the second computing unit 5, this speed stabilizing control module 6 sends stable control signal to proportioning valve, and the travelling speed of control brake beam is stabilized in quick travelling speed Vs; When the current location of dynamic beam arrive start normal danger and its present speed do not reach zero time, 3rd judging unit 9 judges that dynamic beam is in the brake stage, speed reduction control unit 8 transmits control signal to proportioning valve, and control brake beam runs with described retarded velocity a2, until the speed of dynamic beam reduces to zero.
Compared to prior art, a kind of ceramic brick press velocity location double-closed-loop control method creates a speeds control closed loop to control the speed of brake beam in real time according to the present speed of dynamic beam, the location of position-force control realization to dynamic beam is created according to the current location of dynamic beam, move the travelling speed of beam with velocity close-loop control, move beam with position-force control and run the position that will arrive.In dynamic beam operational process, because the atmospheric pressure difference of inertia and top tank causes the instability of speed all can utilize speed closed loop to control, speed closed loop ensure that the operation of dynamic beam stabilized speed, the synchronization action of dynamic beam and liftout attachment can be ensured like this, better can ensure the qualification rate of adobe, avoid dynamic beam speed that the unreasonable situation causing efficiency to reduce is set simultaneously.Omnidistance velocity close-loop control in dynamic beam operational process; the whole service process of dynamic beam is all very steady; and the switching of speed also can be more level and smooth, controls the problem such as segmentation, overshoot, the lengthening of pre-decelerating time embodied before no longer including, export without sudden change and also can better protect proportioning valve.In addition, because what adopt when the brake of dynamic beam is position-force control, control accuracy improves a lot, and repeatable accuracy is also fine.The overall operation speed of press increases, and overall performance has obvious lifting.Structure of the present invention is simple, has stronger dirigibility and adaptability, uses simple and convenient, and large step improves product quality, precision and performance.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (4)
1. a ceramic brick press velocity location double-closed-loop control method, is characterized in that comprising the following steps:
Step one: initial position and the target location of presetting the dynamic beam of ceramic brick press, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1; Preset the acceleration a1 of this dynamic beam, fast travelling speed Vs and retarded velocity a2;
Step 2: the beginning normal danger calculating this dynamic beam, its absolute displacement values L2=L1-Vs
2/ a2;
Step 3: transmit control signal to proportioning valve, control brake beam runs with acceleration a1;
Step 4: measure the present speed of this dynamic beam and compare with described quick travelling speed Vs, judges whether the present speed of this dynamic beam reaches quick travelling speed Vs, if yes, then enters step 5; Otherwise jump to step 3;
Step 5: the present speed measuring this dynamic beam, using quick travelling speed Vs as input, using present speed as feedback, carries out pid calculation computing according to the error between input and feedback;
Step 6: to the speed control signal of proportioning valve stable output, by the velocity-stabilization of dynamic beam at Vs;
Step 7: measure the current location of this dynamic beam and compare with described beginning normal danger, judges whether this dynamic beam has arrived beginning normal danger, if yes, then enters step 8, otherwise jumps to step 5;
Step 8: transmit control signal to proportioning valve, control brake beam runs with retarded velocity a2;
Step 9: measure the present speed of this dynamic beam and judge whether the present speed of this dynamic beam reaches zero, if yes, then method ends; Otherwise jump to step 8.
2. a kind of ceramic brick press velocity location double-closed-loop control method according to claim 1, is characterized in that:
In step 4, detected the position of dynamic beam in real time by a displacement transducer, and the present speed that derived function obtains dynamic beam is carried out to the position of dynamic beam;
In step 7, directly measured the current location of dynamic beam by institute's displacement sensors;
In step 9, detected the position of dynamic beam in real time by institute's displacement sensors, and the present speed that derived function obtains dynamic beam is carried out in the position of dynamic beam.
3. a kind of ceramic brick press velocity location double-closed-loop control method according to claim 2, is characterized in that: the displacement transducer in step 4, step 7 and step 9 is SSI displacement transducer.
4. a ceramic brick press velocity location double-closed-loop control device, is characterized in that: comprise storage element, the first computing unit, accelerate control module, the first judging unit, the second computing unit, speed stabilizing control module, the second judging unit, speed reduction control unit and the 3rd judging unit;
Described storage element stores the initial position of the dynamic beam of the ceramic brick press preset, target location, beginning normal danger, acceleration a1, fast travelling speed Vs, retarded velocity a2, wherein the absolute displacement values of initial position is L0, and the absolute displacement values of target location is L1;
Described first computing unit is calculated the beginning normal danger of this dynamic beam and is stored by storage element, wherein: the absolute displacement values L2=L1-Vs starting normal danger
2/ a2;
Described acceleration control module receives the work order of described first judging unit and transmits control signal to proportioning valve, and control brake beam is with acceleration a1 Accelerating running;
Described first judging unit judges the present speed of this dynamic beam measured; When the present speed of this measured dynamic beam does not reach quick travelling speed Vs, this first judging unit sends work order to acceleration control module;
Described second computing unit, using quick travelling speed Vs as input, using present speed as feedback, carries out pid calculation according to the error between input and feedback and result is sent to described speed stabilizing control module;
Described speed stabilizing control module receives the work order of described second judging unit with the result of calculation of described second computing unit and transmits control signal to proportioning valve, and the travelling speed controlling brake beam is stabilized in Vs;
Described second judging unit judges present speed and the current location of this measured dynamic beam simultaneously; When the present speed of this measured dynamic beam has reached quick travelling speed Vs and the current location working as this measured dynamic beam does not arrive beginning normal danger, this second judging unit sends work order to this speed stabilizing control module;
Described speed reduction control unit receives the work order of described 3rd judging unit and transmits control signal to proportioning valve, and control brake beam runs slowly with retarded velocity a1;
Described 3rd judging unit judges present speed and the current location of this dynamic beam measured; Start normal danger when the non-vanishing and current location working as this measured dynamic beam of the present speed of this measured dynamic beam has arrived or exceeded this, then send work order to this speed reduction control unit.
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| CN106272900A (en) * | 2016-08-17 | 2017-01-04 | 佛山市恒力泰机械有限公司 | A kind of intelligent pressure control method of hydraulic press |
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Application publication date: 20151014 Assignee: KEDA CLEAN ENERGY Co.,Ltd. Assignor: FOSHAN HENGLITAI MACHINERY Co.,Ltd. Contract record no.: X2022440000043 Denomination of invention: A double closed loop control method for speed and position of ceramic brick press Granted publication date: 20170728 License type: Common License Record date: 20220630 Application publication date: 20151014 Assignee: FOSHAN DLT TECHNOLOGY CO.,LTD. Assignor: FOSHAN HENGLITAI MACHINERY Co.,Ltd. Contract record no.: X2022440000044 Denomination of invention: A double closed loop control method for speed and position of ceramic brick press Granted publication date: 20170728 License type: Common License Record date: 20220630 |