CN115815111A - Method for reducing vibration screen resonance and vibration screen - Google Patents
Method for reducing vibration screen resonance and vibration screen Download PDFInfo
- Publication number
- CN115815111A CN115815111A CN202211533469.2A CN202211533469A CN115815111A CN 115815111 A CN115815111 A CN 115815111A CN 202211533469 A CN202211533469 A CN 202211533469A CN 115815111 A CN115815111 A CN 115815111A
- Authority
- CN
- China
- Prior art keywords
- vibrating screen
- band
- vibration exciter
- eccentric block
- type brake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention relates to a method for reducing resonance of a vibrating screen, in particular to a method for measuring the rotating speed of an eccentric block in a vibration exciter in real time by a speed measuring sensor when the vibrating screen is stopped; the rotating speed of the eccentric block is close to the natural frequency of the vibrating screen, and the band-type brake tightly holds the main shaft of the vibration exciter; the rotating speed of the eccentric block is far away from the natural frequency of the vibrating screen, and the band-type brake loosens the main shaft of the vibration exciter. The utility model discloses a vibrating screen specifically is for including vibrating girder, and its both ends are installed on the vibrating screen both sides board, vibrating girder installs vibration exciter, tacho sensor and band-type brake, the vibration exciter passes through the eccentric block rotation of motor drive main shaft both sides, tacho sensor is used for measuring the speed of eccentric block to transmit signal with the band-type brake, band-type brake received signal band-type tightens or loosens the vibration exciter main shaft. The vibrating screen has a simple structure, effectively solves the problem that the vibrating screen has adverse effect on equipment when the vibrating screen is in over-resonance during parking, greatly reduces the load on the foundation, and can reduce the civil engineering cost of the vibrating screen by utilizing the technology.
Description
Technical Field
The invention relates to the field of vibrating screens, in particular to a method for reducing resonance of a vibrating screen and the vibrating screen.
Background
The vibrating screen is widely used for screening, dewatering and medium removing of various minerals and mainly comprises a screen box, a spring and vibration exciters, and the working principle of the vibrating screen is that the vibrating screen vibrates by centrifugal force generated by synchronous rotation of eccentric blocks of the vibration exciters at the left end and the right end of the vibrating screen driven by a motor.
To achieve stable operation conditions, the vibrating screen is typically operated in a region far beyond resonance, i.e. the frequency ratio ω/ω n Is more than 3, so as to obtain stable amplitude, wherein omega is the vibration exciting frequency of the vibrating screen, and omega n Being the natural frequency of the shaker, the amplitude is difficult to control in the resonance region, as shown in figure 1. When the vibrating screen is in operation, the eccentric mass of the vibration exciter rotates at a relatively high operating speed, which is generally far from the speed at which the vibrating screen resonates. When the vibrating screen stops, the eccentric block on the vibration exciter loses the driving force of the motor, the eccentric block passes through the resonance area from the working rotating speed to the static state, the eccentric block slowly reduces the speed, the staying time in the resonance area is long, the amplitude can reach 5~7 times of the working amplitude to the maximum, the rotating speed is further reduced, the eccentric block is separated from the resonance area, the amplitude slowly reduces, and the vibrating screen stops moving along with the static state of the eccentric block. The resonance condition can cause the spring to work in a serious overload mode, the service life is greatly shortened in the past, and even the screen machine is broken down. The resonance phenomenon is not only harmful to the equipment itself, but also extremely unfavorable to the civil engineering. In engineering, in order to enable a plant to bear vibration when the vibration screen over-resonates, the civil engineering beam considers the load of the foundation when the vibration screen over-resonates, and the civil engineering cost is increased.
Disclosure of Invention
Aiming at the defects of the background art, the invention provides a new technical scheme, namely a method for reducing the resonance of a vibrating screen, in particular to a method for measuring the rotating speed of an eccentric block in a vibration exciter in real time by a speed measuring sensor when the vibrating screen is stopped; the rotating speed of the eccentric block is close to the natural frequency of the vibrating screen, and the band-type brake tightly holds the main shaft of the vibration exciter; the rotating speed of the eccentric block is far away from the natural frequency of the vibrating screen, and the band-type brake loosens the main shaft of the vibration exciter.
The invention also provides a vibrating screen which comprises a vibrating girder, wherein two ends of the vibrating girder are arranged on two side plates of the vibrating screen, the vibrating girder is provided with a vibration exciter, a speed sensor and a band-type brake, the vibration exciter drives eccentric blocks on two sides of a main shaft to rotate through a motor, the speed sensor is used for measuring the speed of the eccentric blocks and transmitting signals to the band-type brake, and the band-type brake receives signals to tightly hold or loosen the main shaft of the vibration exciter.
The invention provides a method for reducing over-resonance of a vibrating screen and the vibrating screen. When the rotating speed enters the vicinity of the resonance area, the band-type brake is adopted to brake, the rotating speed is rapidly reduced, the vibrating screen is rapidly separated from the resonance area, the amplitude of the vibrating screen is prevented from increasing in the free state of the resonance area, the over-resonance time is shortened, and the amplitude is reduced. Effectively solves the problem of the damage of the vibrating screen to equipment and foundations caused by over-resonance.
Drawings
FIG. 1 is a schematic view of a vibration screen amplitude-frequency curve;
FIG. 2 is a schematic view of an embodiment of the present invention;
in the figure: 1, exciting a girder; 2, a vibration exciter; 3. an eccentric block; 4, a speed measuring sensor; 5, contracting a brake; and 6, a protective cover 6.
Detailed Description
The technical solution disclosed in the present invention is further explained with reference to the drawings and the embodiments.
As shown in figure 1, the rotation speed of the vibrating screen from 0 to working speed is a continuous process from a static state to a working state, the vibrating screen passes through a resonance area of the vibrating screen, and the vibrating screen generally works at far-super-resonance to obtain a stable working conditionRegional frequency ratio omega/omega n More than 3, omega is the vibration exciting frequency of the vibrating screen, omega n Is the natural frequency of the shaker. When the vehicle is stopped, the vehicle also gradually descends from a high speed and slowly stops after passing through a resonance area. When the vibrating screen is in a free state, the vibrating screen stays in a resonance area for a long time, and the amplitude can reach 5~7 times of the working amplitude.
The invention provides a method for reducing resonance of a vibrating screen, which comprises the following steps:
when the vibrating screen finishes working and is ready to stop, the speed measuring sensor starts to work to measure the rotating speed of the eccentric block in the vibration exciter in real time, and at the moment, the vibration exciter rotates at a high speed in working.
When the vibrating screen is stopped, the eccentric block will gradually decrease from a high speed, and the rotating speed omega of the eccentric block will gradually approach the fixed frequency omega of the resonant area of the vibrating screen n When the speed measuring sensor measures that the rotating speed omega of the eccentric block approaches to the fixed frequency omega n The brake is used for outputting a signal A, after receiving the signal A, the brake starts to act, tightly holds the main shaft of the vibration exciter, tightly holds the brake, quickly reduces the rotating speed of the eccentric block, quickly breaks away from a resonance area, and greatly reduces the amplitude during over-resonance.
Natural frequency omega of vibrating screen n ，ω n = 
Wherein K is the spring stiffness of the vibrating screen; and m is the vibrating mass of the vibrating screen.
The speed of the eccentric block is rapidly reduced, and when the measuring sensor measures that the rotating speed omega of the eccentric block is far away from omega n When the vibration sieve is in a static state, the vibration sieve is separated from a resonance area, and the amplitude is gradually reduced.
Preferably, the rotation speed ω of the eccentric mass is reduced by 1.5 times the fixed frequency ω of the resonance region n Then, the speed measuring sensor outputs a signal A; when the rotating speed omega of the eccentric block is 0.5 times of the fixed frequency omega of the resonance area n And then the speed measuring sensor outputs a signal B. The resonance of the over-resonance region is better reduced.
The invention also provides a vibration screen for reducing resonance, which comprises an excitation girder 1, a vibration exciter 2, an eccentric block 3, a speed measurement sensor 4, a band-type brake 5 and a protective cover 6.
As shown in fig. 2, the vibration excitation girder 1 is mounted on two side plates of the vibrating screen through flanges at two ends to form a main structure of the vibrating screen box.
The vibration excitation girder is of a box-type structure, and the vibration exciter 2, the speed measuring sensor 4 and the mounting hole of the band-type brake 5 are fixed on the vibration excitation girder.
The vibration exciters 2 are arranged on the vibration exciting girder and are composed of 1 or more vibration exciters, and the vibration exciters are connected through shafts and rotate synchronously.
The eccentric mass 3 is a component of the vibration exciter, and the eccentric mass rotating at high speed provides driving force for the vibrating screen.
The vibration exciter 2 drives the eccentric blocks 3 on the two sides to rotate at a high speed through a motor to provide power for the vibrating screen.
The speed measuring sensor 4 is arranged on the excitation girder, is close to and positioned below the eccentric block 3, detects the rotating speed of the eccentric block 3 during working, and when the rotating speed reaches to be close to omega n Output signal A when the rotation speed is far from omega n Then, the signal B is output.
The band-type brake 5 is arranged on the excitation girder and can tightly hold the main shaft of the vibration exciter 2, and when the vehicle is stopped, the rotating speed of the eccentric block 3 is measured by the speed measuring sensor 4, and the rotating speed reaches 1.5 times omega n And receiving the signal A, and quickly reducing the rotating speed of the eccentric block to quickly separate from the resonance area for the holding brake. At a further reduction in velocity to 0.5 times omega n When the eccentric block rotates, the band-type brake receives the signal B, the band-type brake is released, the vibration exciter shaft returns to a free state, and the rotating speed of the eccentric block is 5 times omega n Slowly reducing to a static state, wherein the vibrating screen is separated from the resonance area and the amplitude is gradually reduced.
For safety, the protective cover 6 is arranged on the vibration exciter.
When the vibrating screen is stopped, the vibration exciter rapidly passes through the resonance area by controlling the rotating speed of the vibration exciter, and the amplitude of over-resonance is reduced. The vibrating screen has a simple structure, effectively solves the problem that the vibrating screen has adverse effect on equipment when the vibrating screen is in over-resonance during parking, greatly reduces the load on the foundation, and can reduce the civil engineering cost of the vibrating screen by utilizing the technology.
Claims (5)
1. A method of reducing resonance in a shaker, comprising:
when the vibrating screen is stopped, the speed measuring sensor detects the rotating speed of an eccentric block in the vibration exciter in real time;
the rotating speed of the eccentric block is close to the natural frequency of the vibrating screen, and the band-type brake tightly holds the main shaft of the vibration exciter;
the rotating speed of the eccentric block is far away from the natural frequency of the vibrating screen, and the band-type brake loosens the main shaft of the vibration exciter.
2. The method for reducing the resonance of the vibrating screen according to claim 1, wherein when the rotating speed of the eccentric block is 1.5 times of the natural frequency of the vibrating screen, the band-type brake holds the main shaft of the vibration exciter; when the rotating speed of the eccentric block is 0.5 times of the natural frequency of the vibrating screen, the band-type brake loosens the main shaft of the vibration exciter.
3. The utility model provides a vibrating screen, its characterized in that includes vibrating beam, and its both ends are installed on the vibrating screen both sides board, last fixed mounting of vibrating beam has vibration exciter, tacho sensor and band-type brake, it is rotatory that the vibration exciter passes through the eccentric block of motor drive main shaft both sides, tacho sensor is used for measuring the rotational speed of eccentric block to transmit the signal with the band-type brake, band-type brake acceptance signal band-type is tight or loosen the vibration exciter main shaft.
4. A vibrating screen according to claim 3, wherein the exciter is provided with a shield.
5. The vibrating screen as claimed in claim 3, wherein when the rotating speed of the eccentric block is 1.5 times of the natural frequency of the vibrating screen, the band-type brake holds the main shaft of the exciter; when the rotating speed of the eccentric block is 0.5 times of the natural frequency of the vibrating screen, the band-type brake loosens the main shaft of the vibration exciter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211533469.2A CN115815111A (en) | 2022-12-02 | 2022-12-02 | Method for reducing vibration screen resonance and vibration screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211533469.2A CN115815111A (en) | 2022-12-02 | 2022-12-02 | Method for reducing vibration screen resonance and vibration screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115815111A true CN115815111A (en) | 2023-03-21 |
Family
ID=85543626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211533469.2A Withdrawn CN115815111A (en) | 2022-12-02 | 2022-12-02 | Method for reducing vibration screen resonance and vibration screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115815111A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0634776U (en) * | 1992-02-06 | 1994-05-10 | 川崎重工業株式会社 | Vibration mechanical braking device |
| CN101844132A (en) * | 2010-06-30 | 2010-09-29 | 钟祥市新宇机电制造有限公司 | Novel mining vibrating screen |
| JP2012115791A (en) * | 2010-12-02 | 2012-06-21 | Hitachi Constr Mach Co Ltd | Vibration machine |
| CN205032374U (en) * | 2015-09-17 | 2016-02-17 | 洛阳大华重工科技股份有限公司 | Anti synchronous vibration sieve vibration exciter |
| CN205392975U (en) * | 2016-02-23 | 2016-07-27 | 福建铁拓机械有限公司 | Shale shaker plug braking device |
| CN107899943A (en) * | 2017-12-29 | 2018-04-13 | 新乡市振英机械设备有限公司 | A kind of ultrasonic activation sieve cleaning device |
| CN213727701U (en) * | 2020-10-10 | 2021-07-20 | 唐山森普矿山装备有限公司 | Stable structure of screen box of linear vibrating screen of screen side vibration exciter |
-
2022
- 2022-12-02 CN CN202211533469.2A patent/CN115815111A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0634776U (en) * | 1992-02-06 | 1994-05-10 | 川崎重工業株式会社 | Vibration mechanical braking device |
| CN101844132A (en) * | 2010-06-30 | 2010-09-29 | 钟祥市新宇机电制造有限公司 | Novel mining vibrating screen |
| JP2012115791A (en) * | 2010-12-02 | 2012-06-21 | Hitachi Constr Mach Co Ltd | Vibration machine |
| CN205032374U (en) * | 2015-09-17 | 2016-02-17 | 洛阳大华重工科技股份有限公司 | Anti synchronous vibration sieve vibration exciter |
| CN205392975U (en) * | 2016-02-23 | 2016-07-27 | 福建铁拓机械有限公司 | Shale shaker plug braking device |
| CN107899943A (en) * | 2017-12-29 | 2018-04-13 | 新乡市振英机械设备有限公司 | A kind of ultrasonic activation sieve cleaning device |
| CN213727701U (en) * | 2020-10-10 | 2021-07-20 | 唐山森普矿山装备有限公司 | Stable structure of screen box of linear vibrating screen of screen side vibration exciter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102893024B (en) | For the method operating wind energy plant | |
| CN103028539A (en) | Self-adaption amplitude adjustable inertia vibration device | |
| AU2010362535A1 (en) | Method for determining the stiffness and/or damping of a body | |
| CN112513373B (en) | Method for controlling the operation of a vibratory roller | |
| CN206746988U (en) | A kind of three shaft elliptic vibrative screen separating device | |
| CN115815111A (en) | Method for reducing vibration screen resonance and vibration screen | |
| CN209997930U (en) | gravel and sand sieving mechanism is used in construction concrete processing | |
| US10335800B2 (en) | Method for controlling a mineral material processing plant and a mineral material processing plant | |
| CN202185327U (en) | High-speed impact crushing machine without transmission pairs | |
| CN108867264A (en) | Array tamping equipment | |
| CN201433349Y (en) | Rammer compactor | |
| CN202933862U (en) | Automatic optimizing control device for linear sieve | |
| CN214508039U (en) | Pavement vibration exciter of sugarcane harvester | |
| CN214121404U (en) | Excitation frequency detection device and resonance crusher adopting same | |
| CN214636819U (en) | Crushing and screening device for road and bridge construction | |
| CN211160668U (en) | Triaxial excitation device for vibrating screen | |
| CN207260146U (en) | One kind building piling machine | |
| CN106940573B (en) | A kind of intensive mixer control method, apparatus and system | |
| CN211922225U (en) | Synchronous excitation type vibration milling machine | |
| JP2006207354A (en) | Exciter for pile driver adjustable in vibromotive force | |
| CN215289642U (en) | Crushing device for cement pavement | |
| CN208884319U (en) | Array tamping equipment | |
| CN102852178B (en) | Novel vibrating hammer | |
| CN214718368U (en) | Square vibration exciter for swinging screen | |
| JP2007270474A (en) | Vibration roller and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230321 |