CN116475052A - Linear vibration screening device capable of actively adjusting amplitude and method thereof - Google Patents
Linear vibration screening device capable of actively adjusting amplitude and method thereof Download PDFInfo
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- CN116475052A CN116475052A CN202310470203.6A CN202310470203A CN116475052A CN 116475052 A CN116475052 A CN 116475052A CN 202310470203 A CN202310470203 A CN 202310470203A CN 116475052 A CN116475052 A CN 116475052A
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- 238000012216 screening Methods 0.000 title claims abstract description 73
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- 230000033001 locomotion Effects 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000035515 penetration Effects 0.000 claims description 8
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- 230000001360 synchronised effect Effects 0.000 claims description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
- B07B1/286—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens with excentric shafts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention provides a linear vibration screening device and a linear vibration screening method capable of actively adjusting amplitude, wherein the linear vibration screening device comprises a power input module, an amplitude adjusting module, a connecting rod mechanism and a vibrating screen, wherein the power input module drives the vibrating screen to work through the connecting rod mechanism; the power input module comprises an output rotary table and a linear groove, and the amplitude adjusting module comprises an adjusting rotary table and an arc groove; the driving end of the connecting rod mechanism is provided with a connecting shaft, two ends of the connecting shaft are respectively nested in the linear groove and the circular arc groove, and the other end of the connecting rod drives a screen surface component of the vibrating screen; the circular arc groove is designed according to a curve shape with a specific rule relative to the axis of the adjusting turntable, so that the distance between the connecting shaft and the rotation axis and the change of the angle difference between the adjusting turntable and the output turntable can be calculated in a correlated manner, the online accurate amplitude adjustment is possible, the running speed of the vibrating screen is finally ensured to meet the constraint, and the screening efficiency is improved.
Description
Technical Field
The invention relates to the technical field of vibration screening, in particular to a linear vibration screening device capable of actively adjusting amplitude and a method thereof.
Background
The linear vibration screening system is widely applied to the occasion of material screening, and the screening result can be applied to material structure detection and the like. The material screening efficiency is greatly influenced by the amplitude and frequency of the screen movement, and how to improve the screening efficiency is always the focus of researches of students.
The material sieving rate of the sieve mesh is improved, the sieving efficiency is further improved, and the material sieving device is very important to a vibrating sieving device. Part of patents are designed by a vibration screening device with multiple degrees of freedom so as to improve the screening rate and the screening efficiency. Chinese patent 2019102224813 discloses a three-degree-of-freedom series-parallel vibration screening mechanism, a control method and a harvester, which are used for monitoring grain loss rate and distribution state in real time, and adaptively and optimally adjusting horizontal attitude angle, inclination angle and vibration frequency of a screening surface so as to improve screening efficiency of materials under the condition of non-uniform feeding. Chinese patent 201810023726.5 discloses a double-deck multi freedom vibration screening device to through the semi-automatization transportation of material, realize high-efficient screening, greatly improve screening efficiency, reduce operating time, make things convenient for the industrialization mass production.
For a vibratory screening system, the rate of movement of material relative to the screen limits the rate of penetration and screening efficiency, while the amplitude and frequency of vibration of the screen have an effect on the rate of relative movement. The change of the frequency is generally realized by adjusting the movement frequency of a motor, for example, a vibrating screening machine is disclosed in China patent 202110007867.X, and the controller of the invention can control the oscillation frequency of the vibrating screen, so that the screening efficiency and the automation degree of forward conveying of materials are effectively improved. However, changes in the frequency of vibration can have a large impact on the productivity of the screening system.
The amplitude is adjusted by changing the structural parameters or dynamics. Through changing structural parameters, the amplitude of different positions of the screen is adjusted, so that the state of material accumulation at different positions of the screen is improved. For example, the vibration screening device related in Chinese academic paper 'research on variable amplitude anti-blocking screening process under different feeding modes' realizes the change of parameters such as amplitude and the like at different positions of a screening surface by adjusting the parameters of a connecting rod; the variable-amplitude vibration screening device related in the Chinese academic paper, wet coal variable-amplitude equal-thickness elastic deep screening mechanism research, is realized by changing material separation curves of different sectional screening surfaces. However, the above documents are all cases where the structural parameters are fixed and the amplitude parameters are also fixed, and there are few studies on actively adjusting the amplitude in real time. For the method of dynamic characteristic adjustment, for example, a nonlinear vibration relaxation sieve amplitude online stepless adjustment device and a use method of the nonlinear vibration relaxation sieve are disclosed in Chinese patent CN114273219B, a high-frequency sieve capable of automatically adjusting the amplitude and an automatic adjustment method are disclosed in CN105855160B, and the amplitude adjustment is respectively realized by adding a stepless adjustment damper device or adjusting the magnitude of current, but the method depends on a dynamic model, does not have the capability of observing the amplitude in real time, and cannot accurately control the amplitude of a vibration screening system.
For a linear vibration screening system, in order to improve the accuracy of amplitude control, a method for adjusting structural parameters of a vibration system is often adopted to realize the adjustment of the amplitude, and the difficulty in online real-time amplitude adjustment is how to design a structural parameter adjusting mechanism of a vibration mechanism, so that the accurate control of the amplitude is realized. The adjustment of the amplitude usually needs to adjust the effective acting length of the swing arm, and the swing arm moves along with the load at high frequency, if the mechanism for adjusting the amplitude is loaded on the load end, the overload of the load may be caused, and the overall efficiency and stability are affected.
In deeper studies, it is found that the sieving rate of the material in the linear vibrating sieve directly determines the sieving efficiency, and the excessive movement speed of the sieve surface causes the decreasing of the sieving rate, and the too small movement speed, the friction force between the material and the sieve surface hinders the relative movement between the material and the sieve surface. To improve the sieving effect of the material, the movement speed of the sieving surface should be limited in a proper range, and the autonomous adjustment of the amplitude is an effective way to solve the problem.
Therefore, how to realize the real-time control of the vibration amplitude in the vibration screening process, thereby ensuring that the movement speed of the vibration screen is in the constraint range as far as possible, improving the screening rate and the screening efficiency of the material, and not affecting the bearing capacity of the load end is a problem to be solved urgently.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, thereby providing a linear vibration screening device capable of actively adjusting the amplitude and a method thereof, realizing accurate control of the amplitude by respectively driving a load and an adjusting mechanism through double motors, simultaneously ensuring the vibration screening efficiency without influencing the bearing capacity of the load end by the adjusting mechanism.
The basic design concept of the invention is as follows: the screen mesh moving speed of the linear vibration screening device is designed in a linkage manner with the screen mesh amplitude to form an adjusting model, meanwhile, the amplitude of the amplitude adjustment is related to the difference of the moving output angles of the two motors through the rule of designing the amplitude adjustment, finally, the amplitude adjustment is realized through the control of the moving angles of the output ends of the two motors, and further, the screen mesh moving speed is adjusted, so that the screen penetration rate is effectively improved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a linear vibration screening device capable of actively adjusting amplitude is characterized in that: the vibration sieve comprises a power input module, an amplitude adjusting module, a connecting rod mechanism and a vibration sieve, wherein the power input module drives the vibration sieve to work through the connecting rod mechanism;
the power input module comprises an output turntable which actively performs rotary motion and a linear groove arranged on the output turntable, the amplitude adjusting module comprises an adjusting turntable which actively performs rotary motion and an arc groove arranged at the eccentric position of the adjusting turntable, and the rotary shafts of the output turntable and the adjusting turntable are positioned on the same rotary shaft line;
the driving end of the connecting rod mechanism is provided with a connecting shaft, two ends of the connecting shaft are respectively nested in the linear groove and the circular arc groove in a clearance fit manner, and the other end of the connecting rod drives a screen surface component of the vibrating screen;
the circular arc groove is designed according to a curve shape with a specific rule relative to the axis of the adjusting turntable, the linear groove is designed according to a specific direction, the relative rotation of the adjusting turntable and the output turntable is used for adjusting the distance between the connecting shaft and the rotation axis, the synchronous rotation of the adjusting turntable and the output turntable is used for driving the operation of the connecting rod mechanism, and the distance between the connecting shaft and the rotation axis can be calculated in a correlated manner with the change of the angle difference between the adjusting turntable and the output turntable.
The connecting rod mechanism comprises a connecting rod, a bearing, a connecting shaft and a shaft sleeve, wherein the shaft sleeve is a self-lubricating graphite copper sleeve, the driving end of the connecting rod is arranged on the connecting shaft through the bearing, two shaft sleeves are respectively arranged at two ends of the connecting shaft and are respectively nested in a linear groove and an arc groove in a clearance fit manner, and the other end of the connecting rod drives a screen surface component of the vibrating screen through the bearing.
The specific regular curve is a bezier curve or a sine curve or a cosine curve.
Based on the above, the output turntable and the adjusting turntable are driven by two motors respectively, the two motors are installed based on the same platform, and the two motors rotate at the same speed in a normal state and rotate at different speeds in a speed regulation state.
Based on the above, the motor of power input module is fixed in on the platform through first support, output carousel install in on the motor output shaft of power input module, through first cross roller bearing normal running fit between output carousel and the first support, the first inner pressure board of first cross roller bearing is covered in the installation of first support outer end.
Based on the above, the motor of amplitude modulation module is fixed in on the platform through the second support, adjust the carousel install in on the motor output shaft of amplitude modulation module, adjust through second cross roller bearing normal running fit between carousel and the second support, the second inner pressure board of second cross roller bearing is installed to second support outer end.
The vibrating screen is a linear vibrating screen and comprises a screen, a guide rail mechanism and a supporting frame, the screen is driven by a connecting rod to linearly reciprocate along the guide rail mechanism, and the screen and the guide rail mechanism are installed on the platform based on the supporting frame.
Based on the above, the output rotary disk outputs an angle θ 1 The output angle theta of the regulating turntable 2 Determining that the curve of the specific rule is Bezier curve, x r Representing the displacement of the movement of the screen,indicating the movement speed of the screen, h indicating the height between the screen and the rotation center of the power input module, and l being a fixed value 1 Indicating that the distance between the rotation center of the power input module and the connecting shaft of the connecting rod mechanism is adjustable, l 2 The distance between the rotation centers of the two ends of the connecting rod is represented as a fixed value, and the distance l between the rotation center of the power input module and the connecting shaft is represented as 1 The expression is as follows:
l 1 ＝f(θ 2 -θ 1 )
wherein the function f represents the rotation angle difference θ 2 -θ 1 And/l 1 The mapping relation between the two is determined by Bezier curve mathematical expression of the circular arc groove.
The linear vibration screening method with the amplitude being actively adjusted comprises the linear vibration screening device with the amplitude being actively adjusted and an amplitude adjusting controller, wherein the amplitude adjusting controller is used for controlling the working states of a motor of a power input module and a motor of an amplitude adjusting module, and the linear vibration screening method is adjusted by the following steps:
according to vibration sieve parameters, a motion model of a vibration sieve system is established, and the movement of the sieve is determinedDynamic position x r Speed of movementIs a mathematical relationship expression of (a);
according to the parameters of the materials and the screen, a material screen penetration model is established, and the maximum speed of the screen under the condition of material screen penetration is determined
When the speed of the screen movement is within the constrained speed range, i.eWhen the two motors are controlled to synchronously move according to the set rotating speed, the change rate of the distance between the connecting shaft and the rotating center of the power input module is +.>And the output angle theta of the two motors is made 1 And theta 2 The increments remain synchronized, i.e.)>
When the speed of movement of the screen is greater than the maximum speed of constraint, i.eIn this case, the motor of the power input module is controlled to continue at the set rotational speed +.>Motion, the output angle theta of the motor of the amplitude adjusting module is controlled by the amplitude adjusting controller 2 And theta 1 The rotating speed difference is generated between the two rotating speeds, so that the circular arc groove of the adjusting turntable is matched with the linear groove on the output turntable to adjust the radial position of the connecting shaft in real time, namely the distance l between the connecting shaft and the rotating center of the power input module 1 The movement speed of the screen is kept within the constraint speed range by adjusting the amplitude.
As mentioned above, when the speed of movement of the screen is greater than the maximum speed of constraint, i.eWhen the power input module rotates, the distance l between the rotating center of the power input module and the connecting shaft 1 The desired regulation law is expressed as:
wherein t is i+1 ＝t i +Δt, t is time, Δt is the sampling interval.
Based on the above, the motor output angle θ of the amplitude adjusting module 2 The control regulation law is expressed as:
θ 2 ＝f -1 (l 1 )+θ 1
wherein the function f -1 Representation function f (θ 2 -θ 1 ) Is an inverse function of (c).
Based on the above, the control target of the amplitude adjustment controller is designed as follows: the movement speed of the screen is controlled to the maximum limit and is kept within the speed constraint range.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and in particular, the invention has the following advantages:
1. the invention designs a linear vibration screening system based on the association adjustment between the vibration speed and the vibration amplitude of a screen, so as to improve the screen penetration rate, wherein the vibration amplitude is accurately adjusted, the designed adjustment mode comprises two turntables and an adjustment mechanism which is formed by matching an arc groove of a specific curve and a linear groove of a specific direction which are respectively arranged on the turntables, so that the adjustment of the vibration amplitude can be adjusted through the change of the rotation angle of the two turntables, the adjustment process of the vibration amplitude has a formula which can be parameterized, and the adjustment can be actively and online interposed and adjusted only through the rotation speed adjustment of two transmission motors, thereby being efficient and convenient.
2. Because the link mechanisms for determining the amplitude are all positioned at the load end in the high-frequency vibration mode, if the adjusting mechanisms are all arranged at the load end, the load end is excessively heavy, and the vibration is not facilitated; and the power required for changing the amplitude is extremely large, and it is difficult to design the device at the load end. Therefore, the scheme adopts two motors to respectively drive the adjusting turntable and the output turntable, realizes the consistency of output through synchronous rotation of the two motors, and realizes the adjustment of amplitude through differential speed adjustment. This way, on the one hand, high loads can be avoided and, on the other hand, a large intervention of external forces required for the adjustment process can be provided.
Drawings
Fig. 1 is a schematic view of the overall structure of a linear vibration screening device with active amplitude adjustment according to the present invention.
Fig. 2 is a schematic diagram of the explosive structure of the core transmission part of the linear vibration screening device with actively regulated amplitude in the present invention.
Figure 3 is a cross-sectional view of the core drive section of the actively amplitude modulated linear vibratory screening device of the present invention.
Fig. 4 is a schematic diagram of amplitude adjustment in the present invention.
Fig. 5 is a schematic diagram of modeling linear vibratory screening motion in the present invention.
FIG. 6 is a schematic diagram of a linear vibration screening method in accordance with the present invention.
Fig. 7 is a schematic view of a vibratory screening device according to the present invention.
Figure 8 is a simulation of the velocity of the screen movement of the vibratory screening device according to the present invention.
In the figure: 1. a power input module; 2. an amplitude adjustment module; 3. a link mechanism; 4. vibrating and screening; 5. a platform;
11. a first motor; 12. an output turntable; 13. a linear groove; 14. a first bracket; 15. a first crossed roller bearing; 16. a first inner platen;
21. a second motor; 22. adjusting a turntable; 23. an arc groove; 24. a second bracket; 25. a second crossed roller bearing; 26. a second inner platen;
31. a connecting rod; 32. a bearing; 33. a connecting shaft; 34. a shaft sleeve;
41. a screen; 42. a guide rail mechanism; 43. and (5) supporting frames.
Detailed Description
The technical scheme of the invention is further described in detail through the following specific embodiments.
As shown in fig. 1-8, the linear vibration screening device capable of actively adjusting the amplitude comprises a power input module 1, an amplitude adjusting module 2, a connecting rod mechanism 3 and a vibrating screen 4, wherein the power input module 1 drives the vibrating screen 4 to work through the connecting rod mechanism 3.
The power input module 1 includes a first motor 11, an output turntable 12 driven by the first motor 11 to perform a rotary motion, and a linear slot 13 disposed on the output turntable 12, where in this embodiment, the direction of the linear slot 13 passes through the axis of the output turntable 12, and the power input module 1 provides a main output power. Specifically, the first motor 11 is fixed on the platform 5 through a first bracket 14, the output rotary table 12 is mounted on an output shaft of the first motor 11, the output rotary table 12 is in running fit with the first bracket 14 through a first crossed roller bearing 15, and a first inner pressing plate 16 covering the first crossed roller bearing 15 is mounted at the outer end of the first bracket 14.
The amplitude adjusting module 2 includes a second motor 21, an adjusting turntable 22 driven by the second motor 21 to perform a rotary motion, and an arc groove 23 disposed at an eccentric position of the adjusting turntable 22, where in this embodiment, a curve of the arc groove 23 is a bezier curve set based on an axis of the adjusting turntable 22 as a reference. Specifically, the second motor 21 is fixed on the platform 5 through a second bracket 24, the adjusting turntable 22 is mounted on an output shaft of the second motor 21, the adjusting turntable 22 is in running fit with the second bracket 24 through a second crossed roller bearing 25, and a second inner pressing plate 26 covering the second crossed roller bearing 25 is mounted at the outer end of the second bracket 24.
The rotary shafts of the output rotary table 12 and the regulating rotary table 22 are positioned on the same rotary shaft line, the two motors are installed based on the same platform, the two motors rotate at the same speed in a normal state and rotate at different speeds in a speed regulation state, specifically, when the motion angles output by the first motor and the second motor are inconsistent, the circular arc groove 23 in the regulating rotary table 22 drives the connecting shaft 33 to move along the linear groove 13, namely, the distance between the connecting shaft and the rotary shaft line is changed aiming at the rotary shaft line, so that the real-time regulation of the amplitude is realized.
The connecting rod mechanism 3 comprises a connecting rod 31, a bearing 32, a connecting shaft 33 and a shaft sleeve 34, wherein the shaft sleeve 34 is a self-lubricating graphite copper sleeve, the driving end of the connecting rod 31 is arranged on the connecting shaft 33 through the bearing 32, two shaft sleeves 34 are respectively arranged at two ends of the connecting shaft 33, the two shaft sleeves 34 are respectively nested in the linear groove 13 and the circular arc groove 23 in a clearance fit manner, and the other end of the connecting rod 31 drives a screen surface component of the vibrating screen 4 through the bearing 32.
The vibrating screen 4 is a linear vibrating screen and comprises a screen 41, a guide rail mechanism 42 and a supporting frame 43, the screen 41 is driven by the connecting rod 31 to linearly reciprocate along the guide rail mechanism 42, and the screen 41 and the guide rail mechanism 42 are installed on the platform 5 based on the supporting frame 43.
In the actual driving operation, the amplitude of the link mechanism 3 is determined by the adjustment dial 22 and the output dial 12, and therefore, the amplitude is fixed when the rotation speeds of the first motor 21 and the second motor 22 are synchronized. The output power of the load side requires the first motor 21 and the second motor 22 to be output together, but the primary function of the first motor 21 is power output and the primary function of the second motor 22 is for regulation.
The basic principle of regulation is: the circular arc groove 23 is designed according to a Bezier curve shape relative to the axis of the adjusting turntable 22, so that the distance between the driving end of the connecting rod mechanism 3 and the axis of the adjusting turntable or the output turntable can be calculated in a correlation manner with the change between the rotation angles of the adjusting turntable.
Specifically, a linear vibration screening method capable of actively adjusting amplitude is designed, the linear vibration screening device capable of actively adjusting amplitude and an amplitude adjusting controller are included, and the amplitude adjusting controller is used for controlling the working states of a motor of a power input module and a motor of an amplitude adjusting module, and is adjusted by the following method:
s1, according to the vibration screening structural parameters, a motion model of a vibration screening system is established, and the motion position and the motion speed of a screen surface of the vibration screening system can be expressed as follows:
wherein the output rotary table outputs an angle theta 1 The output angle theta of the regulating turntable 2 ，x r Representing the displacement of the movement of the screen,the movement speed of the screen is represented, h represents the height between the screen and the rotation center (axis of the output turntable) of the power input module, and is a fixed value, l 1 The distance between the rotation center of the power input module (the axis of the output turntable) and the connecting shaft of the connecting rod mechanism is represented as an adjustable quantity, l 2 The distance between the centers of rotation at the two ends of the connecting rod is shown as a fixed value.
S2: according to the parameters of the materials and the screen, a material screen penetration model is established, and the maximum speed of the screen under the condition of material screen penetration is determined
The relative speed between the material and the screen when critical through the screen is taken as the maximum speed of the screen under constraintTaking ellipsoidal material particles as an example, a critical motion equation of the ellipsoidal material particles relative to downward oblique throwing motion is as follows:
wherein DeltaX, deltaY are horizontal and vertical components in the process of obliquely throwing and sieving particles, D is equivalent sieve pore diameter, and a and D are short diameter and long diameter of ellipsoidal material particles;
calculating critical speedThe method comprises the following steps:
s3: when the speed of movement of the screen is within the constrained speed range, i.eWhen the motor is in operation, the first motor and the second motor are controlled to move according to the set rotating speed, and (2)>And to make the output angle theta 1 And theta 2 Increment keeps synchronous ++>
S4: when the screen movement speed is greater than the maximum speed of the constraint, i.eControlling the first motor to continue according to the set rotating speed +.>Motion, designing amplitude regulation controller, controlling second motor to make output angle theta 2 And theta 1 The rotating speed difference is generated between the two rotating speeds, so that the radial position of a connecting shaft in the connecting rod mechanism is adjusted in real time through adjusting an arc groove in the turntable, the position of the connecting shaft in a linear groove in the power driving disk is further adjusted, and the movement speed of the screen is kept within a constraint speed range through adjusting the amplitude.
The method comprises the following steps:
center of rotation (rotation axis)Distance to connecting shaft l 1 The expression is as follows:
wherein t is i+1 ＝t i +Δt, t is time, Δt is the sampling interval.
It should be noted that, the movement speed of the screen may be monitored by a conventional sensor, and the monitoring data is shared with the amplitude adjustment controller in real time.
The motor output angle theta of the amplitude adjusting module 2 The control regulation law is expressed as:
θ 2 ＝f -1 (l 1 )+θ 1
wherein the function f -1 Representation function f (θ 2 -θ 1 ) Is an inverse function of (c).
Distance l between rotation center of power input module and connecting shaft 1 The expression is as follows:
l 1 ＝f(θ 2 -θ 1 )
wherein the function f represents the rotation angle difference θ 2 -θ 1 And/l 1 The mapping relation between the two is determined by Bezier curve mathematical expression of the circular arc groove.
In other embodiments, the curved design of the circular arc groove may be other types of curves, such as sine or cosine curves, etc., and curves quantized by calculation may be used.
The control target design of the amplitude adjustment controller is as follows: the movement speed of the screen is controlled to the maximum limit and is kept within the speed constraint range, so that the sieving rate and sieving efficiency of materials are improved, the problem that the vibration frequency of the screen is influenced by frequent acceleration and deceleration of a traditional single motor for improving the sieving rate is avoided, and the productivity of a sieving system is further influenced.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (12)
1. A linear vibration screening device capable of actively adjusting amplitude is characterized in that: the vibration sieve comprises a power input module, an amplitude adjusting module, a connecting rod mechanism and a vibration sieve, wherein the power input module drives the vibration sieve to work through the connecting rod mechanism;
the power input module comprises an output turntable which actively performs rotary motion and a linear groove arranged on the output turntable, the amplitude adjusting module comprises an adjusting turntable which actively performs rotary motion and an arc groove arranged at the eccentric position of the adjusting turntable, and the rotary shafts of the output turntable and the adjusting turntable are positioned on the same rotary shaft line;
the driving end of the connecting rod mechanism is provided with a connecting shaft, two ends of the connecting shaft are respectively nested in the linear groove and the circular arc groove in a clearance fit manner, and the other end of the connecting rod drives a screen surface component of the vibrating screen;
the circular arc groove is designed according to a curve shape with a specific rule relative to the axis of the adjusting turntable, the linear groove is designed according to a specific direction, the relative rotation of the adjusting turntable and the output turntable is used for adjusting the distance between the connecting shaft and the rotation axis, the synchronous rotation of the adjusting turntable and the output turntable is used for driving the operation of the connecting rod mechanism, and the distance between the connecting shaft and the rotation axis can be calculated in a correlated manner with the change of the angle difference between the adjusting turntable and the output turntable.
2. The actively amplitude modulated linear vibratory screening device of claim 1, wherein: the connecting rod mechanism comprises a connecting rod, a bearing, a connecting shaft and a shaft sleeve, wherein the shaft sleeve is a self-lubricating graphite copper sleeve, the driving end of the connecting rod is arranged on the connecting shaft through the bearing, two shaft sleeves are respectively arranged at two ends of the connecting shaft and are respectively nested in a linear groove and an arc groove in a clearance fit manner, and the other end of the connecting rod drives a screen surface component of the vibrating screen through the bearing.
3. The actively amplitude modulated linear vibratory screening device of claim 1 or 2, wherein: the specific regular curve is Bezier curve or sine curve or cosine curve.
4. A linear vibratory screening device for actively regulating amplitude according to claim 3, wherein: the output turntable and the regulating turntable are driven by two motors respectively, the two motors are installed based on the same platform, and the two motors rotate at the same speed in a normal state and rotate at different speeds in a speed regulation state.
5. The actively amplitude modulated linear vibratory screening device of claim 4, wherein: the motor of the power input module is fixed on the platform through a first support, the output turntable is mounted on a motor output shaft of the power input module, the output turntable is in running fit with the first support through a first crossed roller bearing, and a first inner pressing plate covering the first crossed roller bearing is mounted at the outer end of the first support.
6. The actively amplitude modulated linear vibratory screening device of claim 4, wherein: the motor of the amplitude adjusting module is fixed on the platform through a second support, the adjusting turntable is mounted on a motor output shaft of the amplitude adjusting module, the adjusting turntable is in running fit with the second support through a second crossed roller bearing, and a second inner pressing plate covering the second crossed roller bearing is mounted at the outer end of the second support.
7. A linear vibration screening device for actively regulating amplitude according to claim 1 or 2 or 4 or 5 or 6, characterized in that: the vibrating screen is a linear vibrating screen and comprises a screen, a guide rail mechanism and a supporting frame, wherein the screen is driven by a connecting rod to linearly reciprocate along the guide rail mechanism, and the screen and the guide rail mechanism are installed on the platform based on the supporting frame.
8. The actively amplitude modulated linear vibratory screening device of claim 7, wherein: the output rotary disk outputs an angle theta 1 The output angle theta of the regulating turntable 2 Determining that the curve of the specific rule is Bezier curve, x r Representing the displacement of the movement of the screen,indicating the movement speed of the screen, h indicating the height between the screen and the rotation center of the power input module, and l being a fixed value 1 Indicating that the distance between the rotation center of the power input module and the connecting shaft of the connecting rod mechanism is adjustable, l 2 The distance between the rotation centers of the two ends of the connecting rod is represented as a fixed value, and the distance l between the rotation center of the power input module and the connecting shaft is represented as 1 The expression is as follows:
l 1 ＝f(θ 2 -θ 1 )
wherein the function f represents the rotation angle difference θ 2 -θ 1 And/l 1 The mapping relation between the two is determined by Bezier curve mathematical expression of the circular arc groove.
9. A linear vibration screening method capable of actively adjusting amplitude is characterized by comprising the following steps of: a linear vibration screening device comprising an actively regulated amplitude according to any one of claims 1-8 and an amplitude regulation controller for controlling the operation states of the motor of the power input module and the motor of the amplitude regulation module, by:
according to vibration sieve parameters, a motion model of a vibration sieve system is established, and the motion position x of the sieve is determined r Speed of movementIs a mathematical relationship expression of (a);
according to the parameters of the materials and the screen mesh, a material sieve penetration model is establishedDetermining the maximum speed of the screen under the condition of material passing through the screen
When the speed of the screen movement is within the constrained speed range, i.eWhen the two motors are controlled to synchronously move according to the set rotating speed, the change rate of the distance between the connecting shaft and the rotating center of the power input module is +.>And the output angle theta of the two motors is made 1 And theta 2 The increments remain synchronized, i.e.)>
When the speed of movement of the screen is greater than the maximum speed of constraint, i.eIn this case, the motor of the power input module is controlled to continue at the set rotational speed +.>Motion, the output angle theta of the motor of the amplitude adjusting module is controlled by the amplitude adjusting controller 2 And theta 1 The rotating speed difference is generated between the two rotating speeds, so that the circular arc groove of the adjusting turntable is matched with the linear groove on the output turntable to adjust the radial position of the connecting shaft in real time, namely the distance l between the connecting shaft and the rotating center of the power input module 1 The movement speed of the screen is kept within the constraint speed range by adjusting the amplitude.
10. The method of actively tuned amplitude linear vibratory screening of claim 9, wherein: when the speed of movement of the screen is greater than the maximum speed of constraint, i.eWhen the power input module rotates, the distance l between the rotating center of the power input module and the connecting shaft 1 The desired regulation law is expressed as:
wherein t is i+1 ＝t i +Δt, t is time, Δt is the sampling interval.
11. The method of actively tuned amplitude linear vibratory screening of claim 9, wherein: the motor output angle theta of the amplitude adjusting module 2 The control regulation law is expressed as:
θ 2 ＝f -1 (l 1 )+θ 1
wherein the function f -1 Representation function f (θ 2 -θ 1 ) Is an inverse function of (c).
12. The method of actively tuned amplitude linear vibratory screening of claim 9, wherein: the control target design of the amplitude adjustment controller is as follows: the movement speed of the screen is controlled to the maximum limit and is kept within the speed constraint range.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420802A (en) * | 2023-10-19 | 2024-01-19 | 安徽华星选矿科技有限公司 | Centralized control intelligent system of raw coal impurity removal screening machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420802A (en) * | 2023-10-19 | 2024-01-19 | 安徽华星选矿科技有限公司 | Centralized control intelligent system of raw coal impurity removal screening machine |
| CN117420802B (en) * | 2023-10-19 | 2024-04-30 | 安徽华星选矿科技有限公司 | Centralized control intelligent system of raw coal impurity removal screening machine |
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