CN103506301A - Method for controlling vibrating screen by utilizing hydraulic pressure shock excitation system - Google Patents
Method for controlling vibrating screen by utilizing hydraulic pressure shock excitation system Download PDFInfo
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- CN103506301A CN103506301A CN201210217827.9A CN201210217827A CN103506301A CN 103506301 A CN103506301 A CN 103506301A CN 201210217827 A CN201210217827 A CN 201210217827A CN 103506301 A CN103506301 A CN 103506301A
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Abstract
Provided is a method for controlling a vibrating screen by utilizing a hydraulic pressure shock excitation system. Periodical pressure fluctuation is generated through a hydraulic fluctuation vibration exciter, so that periodical vibration is generated by a hydraulic cylinder piston and a load. A structural member is unnecessary in use, and excitation frequency is adjusted by a frequency converter in a stepless mode. An oil cylinder is fixedly combined with a vibrating screen of a hydraulic fluctuation vibration exciter, the frequency of the vibrating screen of the hydraulic fluctuation vibration exciter can be adjusted and controlled through the frequency converter, and amplitude can be adjusted through an overflow valve. When the amplitude is fixed, the pressure is increased with the increasing of excitation frequency. When the pressure is fixed, the amplitude is decreased with the increasing of the excitation frequency. By means of the method, the vibrating screen can normally work and is long in service life, stepless adjustment under a certain condition is achieved, a vibration working condition is good, and starting and stopping energy consumption is small.
Description
Technical field
The present invention relates to vibratory sieve field, especially a kind of method of utilizing shock wave type high hydraulic shock excitation system to control vibratory sieve.
Background technology
At present, vibration utilizes and extensively to have penetrated into all trades and professions, and classification relates to vibration ore dressing, vibrating transportation, vibrosieve, vibration dehydration, vibration moulding, vibrates, swing crushing, vibrating shakeout, vibration are pressed road, refuse classification, raw material screening etc.; Meanwhile, the use amount of vibratory equipment is also very large.According to on-the-spot service condition, there is following subject matter in the vibratory equipment of inertial excitation: mass of vibration is large, inertial excitation exists rotatablely moving of unbalance dynamic, large especially on the life-span impact of vibrating machine structural member and bearing.Inertial equipment maintenance capacity is large, checks, to change bearing frequent, and vibrational structure part cracking phenomena is serious; Motor band movable eccentric wheel exciting device, its vibration parameters is difficult to be adjusted; Due to the shake change at random of load of ginseng, be difficult to make quality-spring-damping system in more satisfactory vibration operating mode.Development along with large-scale vibrating screen, for proof strength adopts heavy especially structural member, in situation about even having, part deceleration device also participates in vibration, power consumption is large like this, mass of vibration is large, starting and stopping shake difficulty etc. problem further serious, in the whole world, advocate energy-saving and cost-reducing today, seriously hindered the development of Chinese national economy.
Summary of the invention
For solving appeal problem, the technical scheme that the present invention proposes is: utilize hydraulic pressure fluctuation vibration exciter to produce periodic pressure oscillation, thereby make vibration-exciting hydraulic cylinder piston and load produce periodically vibration, and without using structural member, within the specific limits, excited frequency is by frequency converter step-less adjustment; By oil cylinder with utilize hydraulic pressure fluctuation vibration exciter vibratory sieve fixed, by frequency converter, can realize and utilize the adjustable controlled of hydraulic pressure fluctuation vibration exciter vibratory sieve frequency, amplitude can regulate by overflow valve; Regularly, pressure increases with the raising of excited frequency amplitude one; Pressure one regularly, the increase of amplitude excited frequency and reducing.
The invention has the beneficial effects as follows and be: not only vibratory sieve can be worked normally, and the life-span is long, step-less adjustment under certain condition, vibration operating mode is good, and starting and stopping energy consumption is little.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further detailed.
Fig. 1 is hydraulic shock excitation system hydraulic schematic diagram; Fig. 2 is for intending vibratory sieve pilot system hydraulic schematic diagram; The pressure of Tu3Wei Gan chamber connecting line two measuring points is curve map over time; Fig. 4 is the pressure curve map over time of plunger shaft connecting line two measuring points; Fig. 5 is the graph of a relation of the amplitude that utilizes hydraulic pressure fluctuation vibration exciter vibratory sieve, pressure, excited frequency.
Wherein, 1. signal motor; 2. shaft coupling; 3. shock wave device; 4. oil return pipe; 5. oil inlet pipe; 6. accumulator; 7. hydraulic power supply; 8. load; 9. screen box; 10. measuring point 2; 11. measuring points 1; 12. measuring points 3; 13. measuring points 4; 14. vibration-exciting hydraulic cylinders.
The specific embodiment
1. the composition of shock wave type high hydraulic shock excitation system and exciting mechanism.
1.1 shock wave type high hydraulic shock excitation systems mainly by: hydraulic power supply (7), shock wave device (3), vibration-exciting hydraulic cylinder (14), accumulator (6) and connecting line form, as shown in Fig. 1; Shock wave device is designed to rotary, driven, and signal motor (1) is by Frequency Converter Control by signal motor (1); The hydraulic function that shock wave device (3) need complete is position three-way valve function, and guarantees that under open state be duty, and commutating period is much smaller than its working time; Vibration-exciting hydraulic cylinder (14) adopts the double-acting asymmetrical cylinder of single rod; Accumulator (6) adopts the high pressure accumulator of diaphragm type.
1
.2 hydraulic shock excitation systems adopt single rod double acting hydraulic cylinder as exciting output element, high-voltage oil liquid from hydraulic power unit is connected the rod chamber of vibration-exciting hydraulic cylinder all the time by pressure duct, and the plunger shaft of vibration-exciting hydraulic cylinder is distributed by the oil circuit in shock wave device, be equipped with interface with high pressure in-line (5) and return line (4); Shock wave device during work (3) ceaselessly rotates at the driving bottom spool of signal motor (1), along with the rotation of spool, plunger shaft constantly with high pressure oil inlet pipe (5) road interface and oil return pipe (4) road interface alternate conduction.When with the interface conducting of high pressure oil inlet pipe (5) road, high-voltage oil liquid enters plunger shaft, makes vibration-exciting hydraulic cylinder (14) form cylinder with differential effect, and the effect that piston is subject to upper and lower cavity pressure reduction moves upward; And during with the interface conducting of oil return pipe (4) road, the step-down immediately of the liquid of plunger shaft is discharged, now vibration-exciting hydraulic cylinder (14) moves downward under the effect of rod chamber highly pressurised liquid.Like this, under shock wave device (3) rotates continuously, periodically high pressure feed liquor-low pressure discharge opeing in plunger shaft, constantly moves back and forth the piston of vibration-exciting hydraulic cylinder (14) and the dynamic load of piston rod band, i.e. output vibration.
The exciting mechanism of 1.3 hydraulic shock excitation systems: the hydraulic shock excitation system that shock wave device (3) is controlled is the follow-up hydraulic transmission system of an open job, but is different from general follow-up hydraulic transmission system.The course of work of general follow-up hydraulic transmission system is a hydrostatic transmissions process, and shock wave type high hydraulic shock excitation system is the dynamical system of an overall process.The essence of its system exciting still belongs to the research category of present most of hydraulic shock excitation system.Difference is that structure and the work ratio of shock wave device carried out rational design and distribution, can meet the requirement of various vibration operating modes.Due to the special structural design of shock wave device, in the course of the work, on the one hand the mandatory assignment by shock wave device (3) produces periodic flowed fluctuation to system in fluid pressure line, because the fluctuation of flow has produced corresponding pressure oscillation in sap cavity and pipeline; Open and close due to shock wave device valve port in assignment process are all to complete in moment on the other hand, and the moment of valve port switch has produced hydraulic shock ripple in fluid pressure line.These two kinds of pressure waves are reflected in the variation of two sap cavity fluid pressures of hydraulic cylinder after stack, and two sap cavity fluid pressures are applied to vibration-exciting hydraulic cylinder (14) to the coupling power of piston and go up, and piston is moved; Because the mandatory assignment of shock wave device (3) is periodically, thereby the motion of vibration-exciting hydraulic cylinder (14) piston is also periodic reciprocating motion.Because the duty of shock wave device (3) is open state, be different from the general reversal valve by slit flow work, thereby the more general hydraulic system of the efficiency of system is significantly improved.
2. the principle of hydraulic pressure fluctuation vibration exciter vibratory sieve.
Hydraulic pressure utilizes hydraulic pressure fluctuation vibration exciter vibratory sieve to using two vibration-exciting hydraulic cylinders (14) as the vibrator that utilizes hydraulic pressure fluctuation vibration exciter vibratory sieve, piston rod and the screen box of vibration-exciting hydraulic cylinder (14) are rigidly connected, and two vibration-exciting hydraulic cylinders (14) symmetry is arranged on the position of centre of gravity of screen box both sides.The principle of hydraulic pressure fluctuation vibration exciter vibratory sieve is as shown in Fig. 2.
Hydraulic pressure utilizes hydraulic pressure fluctuation vibration exciter shaker systems to control two asymmetrical cylinder by a shock wave device and produces exciting, for utilizing hydraulic pressure fluctuation vibration exciter vibratory sieve to be equivalent to adopt 2 excitings.Therefore require: the through-current capacity of shock wave device will meet the instantaneous delivery requirement of two hydraulic cylinders; For guaranteeing the synchronous of two hydraulic cylinders, require the corresponding connecting line of two hydraulic cylinders consistent.
Excitation system major parameter: 1. vibration-exciting hydraulic cylinder: 80/55 mm.
2. connecting line: the pipeline that test adopts is high pressure rubber hose, wall thickness 5 mm, each pipe interface is all selected snap joint; Plunger shaft connecting line internal diameter 25 mm, long 2 m; Bar chamber connecting line internal diameter is 19 mm, long 2 m; It is the high-pressure rubber pipe of 25 mm that oil-feed main line and return line all adopt internal diameter.
3. shock wave device drive motors: Y90L-6, power 1. 1 kW, rated speed 910 r/min.
4. shock wave device: adopt large flow low frequency shock wave device, valve port (fluid-through port) width b=10 mm, length L=40 mm, spool external diameter r=25 mm.
3. interpretation.
The pressure of 3.1 rod end chamber connecting line two measuring points.Two pressure transmitters are arranged on respectively the connecting line two ends of rod chamber, as shown in Figure 2.Measuring point 2 (10) bar chamber connecting line cylinder ends pressure, measuring point 4 (13) reference test bar chamber connecting line shock wave device (3) end pressures.Object is the pressure loss of measuring stick chamber connecting line and the pressure changing of bar chamber connecting line difference, as shown in Figure 3.
Test condition: frequency converter setpoint frequency is 25 Hz, overflow valve set pressure 2 MPa; The motor speed of surveying is 480 r/min.
The pressure of 3.2 plunger shaft connecting line two measuring points.Two pressure transmitters are arranged on respectively the connecting line two ends of vibration-exciting hydraulic cylinder (14) cavity of resorption (plunger shaft), as shown in Fig. 2.Measuring point 1(11) test cavity of resorption connecting line cylinder ends pressure, measuring point 3 test cavity of resorption connecting line shock wave device outlet pressure.Object is to measure the pressure loss of plunger shaft connecting line and the pressure changing of plunger shaft connecting line difference.Test condition: frequency converter setpoint frequency is 20 Hz, overflow valve set pressure 2 MPa, as shown in Figure 4.
Observe Fig. 3 and Fig. 4 known, the Pressure Variation of same pipeline difference is almost identical, and synchronization force value is almost equal.Show that in shorter fluid pressure line (in experiment, the length of pipeline is 2 m) is due to the transmission speed of pressure wave in fluid pressure line be exceedingly fast (800～1 200m/s), can ignore the phase difference that pipeline difference pressure changes, can think that the Pressure Variation of each point is identical in pipeline, just the friction between hydraulic oil inside and hydraulic oil liquid and pipeline can cause certain pressure loss to make slightly some variations in amplitude, but change not quite, therefore on ignoring the impact of trunking loss in the dynamic analysis of shock wave type high excitation system; From Fig. 4, can observe, synchronization, measuring point 1 (11) is that the pressure amplitude at inlet place, hydraulic cylinder piston chamber is shock wave device liquid outlet place apparently higher than measuring point 3 (12), reflects hydraulic cylinder piston chamber inlet
There is obvious hydraulic shock, illustrate that first exciting is started by hydraulic cylinder entrance, then decay.
The graph of a relation of the amplitude of hydraulic pressure fluctuation vibration exciter vibratory sieve, pressure, excited frequency is known as shown in Figure 5: regularly, excited frequency can be carried out step-less adjustment by frequency converter to pumpage one; Amplitude can regulate by overflow valve; Regularly, pressure increases with the raising of excited frequency amplitude one; Pressure one regularly, the increase of amplitude excited frequency and reducing.This is because the setting pressure of system has limited the energy that system can provide, and has limited the size of load.Load herein refers to the exciting force being determined by mass of vibration, the frequency that shakes, amplitude three elements.Therefore,, in system allowed band, frequency requirement one regularly, wants to improve amplitude, needs the setting pressure of the system that strengthens; Excited frequency 4. 8～15 Hz, have covered intrinsic frequency 5. 17 Hz, do not avoid intrinsic frequency.Reason, by the mandatory assignment to hydraulic pressure fluctuation exciting device-shock wave device, produces high energy pressure wave, utilizes the vibration of pressure wave and makes vibratory sieve work.For ceiling capacity utilize vibration, excited frequency to wish to resonate at system frequency place, can make full use of ceiling capacity like this.
4. conclusion: hydraulic pressure fluctuation vibration exciter vibratory sieve is the follow-up hydraulic system of an open job, its by shock wave device (3) periodically mandatory assignment in fluid pressure line, produce periodic pressure oscillation, thereby make vibration-exciting hydraulic cylinder piston and load produce periodically vibration.In the shock wave type high excitation system course of work, the pressure of plunger shaft is lower than the pressure in bar chamber.It is basically identical that the peak of plunger shaft pressure approximates the minimum in system pressure ，Yu Gan chamber.Within the specific limits, excited frequency is by frequency converter step-less adjustment.By oil cylinder with utilize hydraulic pressure fluctuation vibration exciter vibratory sieve fixed, by frequency converter, can realize and utilize the adjustable controlled of hydraulic pressure fluctuation vibration exciter vibratory sieve frequency, amplitude can regulate by overflow valve; Regularly, pressure increases with the raising of excited frequency amplitude one; Pressure one regularly, the increase of amplitude excited frequency and reducing, starting and stopping energy loss is little.
Claims (3)
1. a method of utilizing shock wave type high hydraulic shock excitation system to control vibratory sieve, it is characterized in that: utilize hydraulic pressure fluctuation vibration exciter to produce periodic pressure oscillation, thereby make vibration-exciting hydraulic cylinder piston and load produce periodically vibration, and without using structural member, within the specific limits, excited frequency is by frequency converter step-less adjustment; By oil cylinder with utilize hydraulic pressure fluctuation vibration exciter vibratory sieve fixed, by frequency converter, can realize and utilize the adjustable controlled of hydraulic pressure fluctuation vibration exciter vibratory sieve frequency, amplitude can regulate by overflow valve; Regularly, pressure increases with the raising of excited frequency amplitude one; Pressure one regularly, the increase of amplitude excited frequency and reducing.
2. a kind of method of utilizing shock wave type high hydraulic shock excitation system to control vibratory sieve according to claim 1, it is characterized in that: hydraulic shock excitation system adopts single rod double acting hydraulic cylinder as exciting output element, high-voltage oil liquid from hydraulic power unit is connected the rod chamber of vibration-exciting hydraulic cylinder all the time by pressure duct, and the plunger shaft of vibration-exciting hydraulic cylinder is distributed by the oil circuit in shock wave device, be equipped with interface with high pressure in-line (5) and return line (4); Shock wave device during work (3) ceaselessly rotates at the driving bottom spool of signal motor (1), along with the rotation of spool, plunger shaft constantly with high pressure oil inlet pipe (5) road interface and oil return pipe (4) road interface alternate conduction; When with the interface conducting of high pressure oil inlet pipe (5) road, high-voltage oil liquid enters plunger shaft, makes vibration-exciting hydraulic cylinder (14) form cylinder with differential effect, and the effect that piston is subject to upper and lower cavity pressure reduction moves upward; And during with the interface conducting of oil return pipe (4) road, the step-down immediately of the liquid of plunger shaft is discharged, now vibration-exciting hydraulic cylinder (14) moves downward under the effect of rod chamber highly pressurised liquid, under shock wave device (3) rotates continuously, periodically high pressure feed liquor-low pressure discharge opeing in plunger shaft, piston and the dynamic load of piston rod band of vibration-exciting hydraulic cylinder (14) are constantly moved back and forth, i.e. output vibration.
3. a kind of method of utilizing shock wave type high hydraulic shock excitation system to control vibratory sieve according to claim 1, it is characterized in that: by shock wave device, control two asymmetrical cylinder and produce exciting, for utilizing hydraulic pressure fluctuation vibration exciter vibratory sieve to be equivalent to adopt 2 excitings, require the through-current capacity of shock wave device will meet the instantaneous delivery requirement of two hydraulic cylinders; For guaranteeing the synchronous of two hydraulic cylinders, require the corresponding connecting line of two hydraulic cylinders consistent.
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| CN201210217827.9A CN103506301A (en) | 2012-06-28 | 2012-06-28 | Method for controlling vibrating screen by utilizing hydraulic pressure shock excitation system |
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| CN201210217827.9A CN103506301A (en) | 2012-06-28 | 2012-06-28 | Method for controlling vibrating screen by utilizing hydraulic pressure shock excitation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107789877A (en) * | 2017-11-28 | 2018-03-13 | 西南石油大学 | A kind of vibratory sieve of eccentric mechanism driving |
| CN110939631A (en) * | 2019-12-26 | 2020-03-31 | 长安大学 | Oil-free hydraulic vibration exciter with adjustable frequency and amplitude and adjusting method thereof |
-
2012
- 2012-06-28 CN CN201210217827.9A patent/CN103506301A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107789877A (en) * | 2017-11-28 | 2018-03-13 | 西南石油大学 | A kind of vibratory sieve of eccentric mechanism driving |
| CN107789877B (en) * | 2017-11-28 | 2023-06-20 | 西南石油大学 | Vibrating screen driven by eccentric wheel mechanism |
| CN110939631A (en) * | 2019-12-26 | 2020-03-31 | 长安大学 | Oil-free hydraulic vibration exciter with adjustable frequency and amplitude and adjusting method thereof |
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Application publication date: 20140115 |