CN210614256U - Electromagnetic vibration exciter easy to tune - Google Patents
Electromagnetic vibration exciter easy to tune Download PDFInfo
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- CN210614256U CN210614256U CN201921190395.0U CN201921190395U CN210614256U CN 210614256 U CN210614256 U CN 210614256U CN 201921190395 U CN201921190395 U CN 201921190395U CN 210614256 U CN210614256 U CN 210614256U
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Abstract
The utility model discloses an easily harmonious electromagnetic vibration exciter, electromagnetic vibration exciter's spring is coil spring, the counterweight plate passes through the stand and links to each other with the vibration board, and the stand top sets up the external screw thread and the cover is equipped with can dismantle the nut. The utility model can calculate the weight of the balance weight plate needed by theory and assemble the balance weight plate according to the theoretical calculation value when the equipment is tuned by increasing or decreasing the balance weight plate; after assembly, the low-critical near-resonance condition can be achieved only by fine adjustment according to the actual tuning condition, the tuning workload is greatly reduced, and the time is shortened.
Description
Technical Field
The utility model relates to an electromagnetism excitation field, concretely relates to easily harmonious electromagnetism vibration exciter.
Background
The electromagnetic vibration exciter (electromagnetic vibrator) is designed by utilizing electromagnetic force driving and mechanical principle. Compared with a mechanical vibrator, the electromagnetic vibration exciter has the advantages of simple structure, no easily-worn rotating piece, long service life and the like. And only the directional vibration vertical to the bin wall is generated, so the stress condition of the bin wall is better.
The electromagnetic vibration exciter uses the thyristor electronic technology, so it has the following characteristics:
1. no rotating parts, no bearing, no speed reducing mechanism, no need of lubricating and oil adding.
2. Simple structure, small external dimension, light weight and convenient maintenance and repair.
3. The required driving power is small and the power consumption is very low.
4. Because the vibrator does not have large starting current when starting, the voltage drop of a power grid is hardly caused when starting, and thus a plurality of exciters can be started simultaneously.
5. After the vibrator is started, the amplitude can reach a working stable value instantly; also, its amplitude may momentarily disappear at the time of parking. Thus, the accuracy of automatic control can be greatly improved.
6. After the related technical measures are added to the feeder, the material can be conveyed, and the technical processes of screening, dewatering, heating, drying, cooling, mixing and the like can be carried out.
At present, an electromagnetic vibration exciter becomes more economical and reasonable process equipment in a mechanical and automatic process. Can be widely applied to the technical processes of fertilizer plants, cement plants, glass plants, casting plants, plastic plants, chemical plants, grain processing plants and the like.
The existing electromagnetic vibration exciter mainly comprises a hammer type, a spring type and a resonance type electromagnetic vibration exciter; the resonance type electromagnetic vibrator consists of a vibrating body, a resonance spring, an electromagnet, an armature, a base and the like. The electromagnet and the armature are respectively fixed on the vibrating body and the base. The mass m1 of the vibrating body and the electromagnet and the mass m2 of the hopper, the material, the base and the armature form an elastic system through elastic elements.
However, the material forming the mass m2 should often change as the operating conditions change, so that the excitation frequency ω or the natural frequency ω o of the entire electromagnetic exciter changes. Resonance type electromagnetic vibrators utilize the principle of resonance, and the vibration system must be made to operate in a low critical resonance state or a resonance state during use. It must be tuned when the operating conditions change. However, the conventional resonant electromagnetic vibrator is generally incapable of adjusting the natural frequency ω o of the vibration system or has a very limited adjustment range, and the natural frequency adjustment involves many variables, so that a user needs to repeatedly adjust the vibration system to obtain a suitable frequency by crosslinking a plurality of variables, which is very tedious and time-consuming. Manufacturers often classify and release electromagnetic vibration exciters of different models according to applied working conditions, and provide electrical parameters of resonance type electromagnetic vibration exciters to help users select proper products, but the requirements of the users for publicly adjusting the frequency according to specific motions cannot be met.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an easy harmonious electromagnetic vibration exciter.
The technical scheme of the utility model as follows:
an electromagnetic vibration exciter easy to tune comprises a base, a spring, a vibrating plate, a housing, a pressure plate, a counterweight plate, an armature, an adjusting screw sleeve, an iron core, a coil and a rod; four rods are vertically fixed on the base in a square form; each rod is sleeved with a spring; a pressure plate is arranged at the top of the spring; the middle part of the upper surface of the base is connected with and provided with an armature through an adjusting threaded sleeve; a vibrating plate is arranged right above the armature iron; the vibrating plate is connected with four groups of springs; the lower surface of the vibrating plate is fixedly connected with a plurality of iron cores, and coils are wound on the iron cores; the housing and the base are connected to form a housing of the electromagnetic vibration exciter, and the tops of the four rods are fixed with the top of the housing;
the spring is a spiral spring, and the rigidity of the spiral spring is fixed and can not be adjusted; the bottom of the iron core, the lower surface of the vibrating plate and the upper surface of the armature are parallel to each other; the upper surface of vibration board is provided with a plurality of stands, the weight plate on be equipped with the unanimous mounting hole of stand quantity and position, the weight plate passes through the stand and links to each other with the vibration board, the stand top sets up the external screw thread and the cover is equipped with can dismantle the nut, can dismantle the nut and be used for locking the weight plate.
As the utility model discloses a preferred, adjust the swivel nut and have four, four adjust swivel nut tops and link to each other in four angles of armature respectively.
Preferably, the armature and the lower surface of the iron core maintain an air gap.
As the utility model discloses a preferred, the pressure disk top be provided with spring washer and adjusting nut for the position of the dead pressure disk of fixed lock.
From the functional curves of the powertrain and the tuning values, for undamped forced vibration, the maximum amplitude occurs at ω/ω o 1; in actual operation, however, the vibration system is always damped to some extent. In this case, the resonant frequency of the vibration system should be
The maximum amplitude point shifts to the left as the damping coefficient n increases, i.e., the maximum amplitude does not occur at ω/ω o equal to 1, but at a position where ω/ω o is slightly smaller than 1. Although the tuning value Z of the vibration system is closer to 1 and the smaller the required excitation force, the more sensitive the change in damping has to the amplitude and the worse the stability of the system. Therefore, in the electric vibration feeder, the natural frequency ω o is generally slightly larger than the vibration frequency ω, and ω/ω o is set to be slightly larger than the vibration frequency ω<1, namely, the working is carried out in a low critical near resonance state.
Under the condition of low critical near resonance, the increase of the damping is usually caused by the increase of the pressure of the materials in the tank body and the bin, meanwhile, the natural frequency of the vibration system is reduced, the tuning value omega/omega o is closer to 1, the amplitude tends to increase, and the amplitude and the tuning value omega/omega o are mutually compensated, so that the feeder can work stably. This compensating relationship is maintained as the damping becomes smaller.
Conversely, if the vibration system is operating in a supercritical near resonance condition, the variation in the damping value causes the maximum amplitude to vary in the same direction as seen by the power system and the tuning value function curve. Thus, the amplitude of the system varies greatly, and the operation is unstable.
Therefore, the vibration system is designed to operate in a low critical near resonance state. According to the recommendation of related data, the selection range of the tuning value is 0.80-0.95, if the tuning is not good, the power consumption is increased when the tuning is lower than 0.80; above 0.95, the material transport is not stable and therefore the tuning must be repeated.
Since the excitation frequency ω is generally invariableTherefore, to change the tuning value Z, only the natural frequency ω o can be changed. According to the introduction of the relevant information, the formula
It is known that the natural frequency ω o is determined by the stiffness k of the elastic system, and the reduced mass m. Wherein the converted mass
The utility model discloses the main spring comprises coil spring, and coil spring's rigidity is fixed unadjustable. Therefore, the method of changing the reduced mass m is adopted for tuning. The vibrating plate of the vibration exciter is provided with a weight plate, the mass m2 is changed by increasing or decreasing the number of the weight plate, and the formula is
It can be seen that the reduced mass m changes accordingly, so as to achieve the purpose of changing the natural frequency ω o.
Because in actual operation, the mass of m1 can be calculated, and the mass of m2 can also be calculated by increasing or decreasing the weight plate; therefore, when the device of the utility model is used for tuning, the weight of the counterweight plate required by theory can be calculated firstly, and then the counterweight plate is assembled according to the theoretical calculation value; after assembly, the low-critical near-resonance condition can be achieved only by fine adjustment according to the actual tuning condition, the tuning workload is greatly reduced, and the time is shortened.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings attached to the specification.
As shown in fig. 1, in one embodiment of the present invention,
an electromagnetic vibration exciter easy to tune comprises a base 1, a spring 2, a vibrating plate 3, a housing 4, a pressure plate 5, a counterweight plate 6, an armature 7, an adjusting screw sleeve 8, an iron core 10, a coil 11 and a rod 12; four rods 12 are vertically fixed on the base 1 in a square form; each rod is sleeved with a spring 2; a pressure plate 5 is arranged at the top of the spring 2; the middle part of the upper surface of the base 1 is connected with and provided with an armature 7 through an adjusting threaded sleeve 8; a vibrating plate 3 is arranged right above the armature 7; the vibrating plate 3 is connected with four groups of springs 2; the lower surface of the vibrating plate 3 is fixedly connected with a plurality of iron cores 10, and coils 11 are wound on the iron cores 10; the housing 4 and the base are connected to form a shell of the electromagnetic vibration exciter, and the tops of the four rods 12 are fixed with the top of the housing 4;
the spring 2 is a spiral spring, and the rigidity of the spiral spring is fixed and can not be adjusted; the bottom of the iron core 10, the lower surface of the vibrating plate 3 and the upper surface of the armature 7 are parallel to each other; the upper surface of the vibrating plate 3 is provided with a plurality of stand columns, the counterweight plate 6 is provided with mounting holes with the number and the positions consistent with those of the stand columns, the counterweight plate 6 is connected with the vibrating plate 3 through the stand columns, the tops of the stand columns are provided with external threads and sleeved with detachable nuts, and the detachable nuts are used for locking the counterweight plate 6;
the number of the adjusting screw sleeves 8 is four, and the tops of the four adjusting screw sleeves 8 are connected with four corners of the armature 7 respectively; an air gap is kept between the armature 7 and the lower surface of the iron core 10; if the air gap between the iron core and the armature of the utility model is 2.8 +/-0.3 mm according to the design requirement, the iron core and the armature cannot collide with each other and need to be parallel to each other. The top of the pressure plate 5 is provided with a spring washer and an adjusting nut which are used for fixing the position of the locking pressure plate 5.
In a preferred embodiment of the present invention, the coil is a 1.16 mm enameled wire, and each coil is wound with 320 turns. In another embodiment of the present invention, the coils are made of phi 1.81 mm enameled wires, and each coil is wound with 130 turns. The terminal block 9 may be provided on the base 1.
The vibration exciter of the utility model can be used as a complete machine to be arranged on the affiliated working position; four machine legs of the base are required to be arranged on a working position in a close and parallel mode, and a spring washer is required to be added to prevent loosening when screws are required to be screwed down. And a thrust plate which is matched with the machine leg is required to have certain flatness. Otherwise the legs are easily broken.
The air gap between the core and the armature must in any case be kept parallel and clean to ensure stable operation. For the occasions with more dust or the conveying of ferromagnetic materials, the sealing cover of the vibration exciter needs to be tightly covered. When the magnetic iron core runs, whether impact sound exists between the iron core and the armature or not is noticed, if impact sound exists, the magnetic iron core is immediately stopped for inspection, and the air gap is adjusted again.
Therefore, when the device of the utility model is used for tuning, the weight of the counterweight plate required by theory can be calculated firstly, and then the counterweight plate is assembled according to the theoretical calculation value; after assembly, the low-critical near-resonance condition can be achieved only by fine adjustment according to the actual tuning condition, the tuning workload is greatly reduced, and the time is shortened.
Claims (4)
1. An electromagnetic vibration exciter easy to tune is characterized by comprising a base (1), a spring (2), a vibrating plate (3), a housing (4), a pressure plate (5), a counterweight plate (6), an armature (7), an adjusting screw sleeve (8), an iron core (10), a coil (11) and a rod (12); four rods (12) are vertically fixed on the base (1) in a square form; each rod is sleeved with a spring (2); a pressure plate (5) is arranged at the top of the spring (2); the middle part of the upper surface of the base (1) is connected with and provided with an armature iron (7) through an adjusting threaded sleeve (8); a vibrating plate (3) is arranged right above the armature iron (7); the vibrating plate (3) is connected with four groups of springs (2); the lower surface of the vibrating plate (3) is fixedly connected with a plurality of iron cores (10), and coils (11) are wound on the iron cores (10); the housing (4) and the base are connected to form a shell of the electromagnetic vibration exciter, and the tops of the four rods (12) are fixed with the top of the housing (4);
the spring (2) is a spiral spring, and the rigidity of the spiral spring is fixed and can not be adjusted; the bottom of the iron core (10), the lower surface of the vibrating plate (3) and the upper surface of the armature iron (7) are parallel to each other; the upper surface of vibration board (3) is provided with a plurality of stands, counterweight plate (6) on be equipped with the unanimous mounting hole of stand quantity and position, counterweight plate (6) link to each other with vibration board (3) through the stand, the stand top sets up the external screw thread and overlaps and be equipped with and to dismantle the nut, can dismantle the nut and be used for locking counterweight plate (6).
2. Electromagnetic vibration exciter easy to tune according to claim 1, characterized in that the number of adjusting screw sleeves (8) is four, and the tops of the four adjusting screw sleeves (8) are respectively connected with the four corners of the armature (7).
3. Electromagnetic exciter for easy tuning according to claim 1, characterised in that an air gap is maintained between the armature (7) and the lower surface of the core (10).
4. Electromagnetic exciter easy to tune according to claim 1, characterized in that the top of the pressure plate (5) is provided with a spring washer and an adjusting nut for fixing the position of the locking pressure plate (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921190395.0U CN210614256U (en) | 2019-07-26 | 2019-07-26 | Electromagnetic vibration exciter easy to tune |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921190395.0U CN210614256U (en) | 2019-07-26 | 2019-07-26 | Electromagnetic vibration exciter easy to tune |
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| CN210614256U true CN210614256U (en) | 2020-05-26 |
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| CN201921190395.0U Active CN210614256U (en) | 2019-07-26 | 2019-07-26 | Electromagnetic vibration exciter easy to tune |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941591A (en) * | 2020-08-17 | 2020-11-17 | 太原理工大学 | Electromagnetic vibration excitation forming device for ballastless track plate |
| RU207359U1 (en) * | 2021-07-07 | 2021-10-25 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» | ELECTROMAGNETIC VIBRATION EXCITER |
| RU2779850C1 (en) * | 2021-10-12 | 2022-09-14 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» | Electromagnetic vibrator |
-
2019
- 2019-07-26 CN CN201921190395.0U patent/CN210614256U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111941591A (en) * | 2020-08-17 | 2020-11-17 | 太原理工大学 | Electromagnetic vibration excitation forming device for ballastless track plate |
| RU207359U1 (en) * | 2021-07-07 | 2021-10-25 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» | ELECTROMAGNETIC VIBRATION EXCITER |
| RU2779850C1 (en) * | 2021-10-12 | 2022-09-14 | Федеральное Государственное Бюджетное Образовательное Учреждение Высшего Образования «Новосибирский Государственный Технический Университет» | Electromagnetic vibrator |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang Jiahuan Engineering Technology Co.,Ltd. Assignor: ZHEJIANG JIAHUAN ELECTRONIC Co.,Ltd. Contract record no.: X2021330000249 Denomination of utility model: An easily tuned electromagnetic exciter Granted publication date: 20200526 License type: Common License Record date: 20210904 |
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| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Zhejiang Qihuan Engineering Technology Co.,Ltd. Assignor: ZHEJIANG JIAHUAN ELECTRONIC CO.,LTD. Contract record no.: X2023980037908 Denomination of utility model: An Easy to Tune Electromagnetic Exciter Granted publication date: 20200526 License type: Common License Record date: 20230712 |