CN2037390U - Electric hammer with frequency following damping system - Google Patents
Electric hammer with frequency following damping system Download PDFInfo
- Publication number
- CN2037390U CN2037390U CN 88220051 CN88220051U CN2037390U CN 2037390 U CN2037390 U CN 2037390U CN 88220051 CN88220051 CN 88220051 CN 88220051 U CN88220051 U CN 88220051U CN 2037390 U CN2037390 U CN 2037390U
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- China
- Prior art keywords
- electric hammer
- stator
- frequency
- mover
- dashpot
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- 238000013016 damping Methods 0.000 title abstract description 3
- 230000003313 weakening effect Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005284 excitation Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000386 athletic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002964 excitative effect Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The utility model relates to an electric hammer with a frequency following system. The utility model can be widely used for electrically drilling holes in the building engineering of houses, bridges, culverts, mines, etc. A common electric hammer is additionally provided with a frequency following damping system so that the natural frequency of a damper automatically regulates along with working objects and different sizes of load application. The utility model can effectively eliminate the vibration of the machine body of the electric hammer, improves workers' labor condition, and improves the service life of the electric hammer.
Description
The utility model is the electric hammer of a band frequency-tracking weakening system, belongs to the electric hammer field.
Electric hammer is to be widely used in house, bridge, culvert, mine etc. to build in the engineering, so that punch on, the fragile material hard at brick wall, rock, concrete etc.Its work characteristics is that drill bit moves with strong axial impact in rotation, is beneficial to creeping into of drill bit.This axial impact athletic meeting of drill bit causes the high vibration of electric hammer fuselage, and this not only makes working environment deteriorate significantly, and impairs operator's health, also can reduce the application life of electric hammer greatly.The Soviet Union adopts the way that adds vibration isolator between fuselage and handgrip to come vibration isolation, in the hope of alleviating the vibration on the handgrip, improves workman's condition of labor.Facts have proved that though this way can make the vibration on the handgrip alleviate to some extent, effect is unsatisfactory, the especially at all vibration that can not alleviate fuselage, inoperative to the working life that improves electric hammer.
The purpose of this utility model is frequency can be followed the tracks of power weakening system be used for electric hammer, so that reduce the vibration of electric hammer fuselage significantly, thereby not only can improve workman's condition of labor greatly, also can increase substantially the application life of electric hammer.
Particular content of the present utility model is: variable ratio frequency changer dynamic damper of suit on common electric hammer.Because the operating mode of electric hammer is often to change, its vibration frequency has bigger variation with target and the different of load size, so the intrinsic frequency of dashpot also must automatically be regulated (promptly should have the frequency-tracking function) thereupon.For this reason, variable ratio frequency changer dashpot and vibration-measuring sensor, (being the vibration measuring coil), signal amplifier, frequency---electric pressure converter and power amplifier component frequency are together followed the tracks of the weakening system, see Fig. 2.
Description of drawings:
Fig. 1: common electric hammer profile
Fig. 2: the electric hammer of band frequency-tracking weakening system
Fig. 3: the electricity of belt variable weakening frequently system is beaten profile
Fig. 4: one of variable ratio frequency changer dashpot schematic diagram scheme
Fig. 5: two of variable ratio frequency changer dashpot schematic diagram scheme
Fig. 6: elastomeric bearing sheet
Introduce summary of the invention in detail below in conjunction with accompanying drawing.Electric hammer is made up of drill bit 1 and hammer body 2.Variable ratio frequency changer dashpot of suit on hammer body 2.In the electric hammer course of work, fuselage shaking signal by 5 outputs of vibration measuring coil, after amplifying, signal amplifier 6 isolates component with drill bit impact motion same frequency by frequency discriminator 7, again through frequency--and electric pressure converter 8 becomes the voltage signal that adapts with the fuselage shaking fundamental frequency.Magnet exciting coil 4 excitations via being defeated by variable ratio frequency changer dashpot 3 after power amplifier 9 amplifications so that change the intrinsic frequency of dashpot, make it to equate with fundamental vibration frequency.So just can eliminate the vibration (can make in theory fuselage depressed fully) of electric hammer fuselage effectively.Because the vibration of fuselage is monitored at any time by sensor, so when causing that when the change of electric hammer operating mode frequency of impact changes, dashpot also has good frequency-tracking performance, also can obtain weakening effect preferably when variant-frequency vibration.
Load onto variable ratio frequency changer dashpot (see figure 3) in common electric hammer fuselage outer cover.The structure and parameter of the internal mechanical part of electric hammer is not done any change.In order to adapt to suit variable ratio frequency changer dashpot (3), the outer shape and the size of electric hammer neck shell need be made corresponding modification.The principle of variable ratio frequency changer dashpot is seen (Fig. 4).Stator 10 is affixed with electric hammer neck shell 16.Mover 11 forms movable the connection by means of bearing 12 and spring 13 with stator.The magnetic circuit of stator and mover is partly made with good permeability magnetic material.Between the working surface of the two, leave a small air gap.After carrying out excitation for magnet exciting coil 4 energisings, magnetic flux constitutes loop via two air gaps.Owing on the working surface of stator and mover, cut the tooth and the groove (rectangular teeth of many annulars vertically.Calmly, the facewidth, tooth pitch and the number of teeth on the mover all equates), under excited state, depart from (not exclusively alignment) if tooth fixed, mover has each other, the magnetic line of force can be forming asymmetric distribution near the air gap produces axial tension (title magnetic pull) between moving, stator.Bias size and offset direction between the tooth of the size and Orientation of magnetic pull and fixed, mover are relevant.When the two tooth fully on time, magnetic pull is zero, this position is stable equilibrium position.In ± 1/4 tooth pitch scope, magnetic pull increases with the increase of bias, and its direction then is to try hard to eliminate bias fixed, the mover tooth, makes it to be returned to stable equilibrium position.The characteristic of this and mechanical spring is similar, and the magnetic pull here is equivalent to the elastic restoring force of mechanical spring, so claim electromagnetic spring.The rigidity of electromagnetic spring can change by regulating exciting current.
The effect of bearing 12 is that to guarantee that mover remains in vibration processes with stator coaxial, and it is constant to keep size of gaps.And can reduce frictional force between fixed, the mover, improve the weakening effect.
The effect of spring 13 has two:
1. when the magnet exciting coil no power, mover is on the position of aiming at fully with the tooth of stator.
2. in parallel with electromagnetic spring, constitute total spring of dashpot together, to reduce the adjusting range of electromagnetic spring.The effect of stop pin 14 is to prevent that mover from rotating with respect to stator, thereby avoids pulling apart the lead-in wire of magnet exciting coil.
The effect of vibration measuring coil 5 is vibration frequencies of monitoring electric hammer fuselage.Under the situation of magnet exciting coil 4 energisings, mover is during with respect to stator vibration, magnetic flux by coil 5 can change, thereby can produce the induced potential of alternation in coil 5, and the frequency of this induced potential is the vibration frequency of fuselage.
The mover quality of variable ratio frequency changer dashpot, the number of teeth, tooth pitch are to determine as calculated according to peak swing and maximum frequency of oscillation that the electric hammer fuselage is surveyed under different operating modes.
The quantity of spring and total mechanical spring rigidity thereof are to determine according to the minimum frequency of impact of electric hammer.
The maximum excitation amperage of magnet exciting coil is to determine according to the HI high impact frequency of electric hammer.
The variable ratio frequency changer dashpot also can adopt the structure shown in (Fig. 5).Adopt two disc elastomeric bearing sheets 17 to replace bearing, spring and stop pin among Fig. 4 here.This elastomeric bearing sheet has higher radially and circumferentially rigidity, then should have elasticity preferably at axis direction.It can integrate the function of bearing, mechanical spring and stop pin, thereby has simplified the structure of dashpot.
Embodiment of the present utility model:
Electric hammer dashpot parameter: 1. design considerations:
Applicable object: homemade time Z1C-26 type electric hammer
Be suitable for drill bit Φ 12～Φ 26
6.5 kilograms of complete machine deadweights
Measure the test of frequency of impact excursion:
Used drill bit: Φ 12,26 two kinds of Φ
Drilling object: brick, concrete
Actual measurement frequency of impact excursion: 47.5～66HZ
The used parameter of fuselage peak swing: 3.2mm 2. dashpots:
Stator outer diameter (being the working surface diameter at air gap place) Φ 122mm
Mover external diameter Φ 180mm
Mover length 122mm
18 of the numbers of teeth
Tooth pitch 5.4mm
Air gap 0.1mm
Maximum excitatory number of ampere turns 367.5 ampere-turns
Maximum magnetic flux pulling force 1420 newton
12 of helix tube type mechanical springs,
Dashpot intrinsic frequency adjusting range 44～70HZ
Can cover the excursion (47.5～66HZ) of electric hammer frequency of impact
Claims (3)
1. electric hammer of forming by drill bit, fuselage, handgrip, it is characterized in that on electric hammer increasing a cover frequency-tracking weakening system, said weakening system is by variable ratio frequency changer dashpot, signal amplifier, frequency--and electric pressure converter and power amplifier are formed.
2. electric hammer as claimed in claim 1, it is characterized in that the dashpot in the wherein said weakening system, form by stator, mover, spring, stop pin, magnet exciting coil and vibration measuring coil, stator and electric hammer shell are fixedly connected, mover forms movable the connection by means of bearing and spring with stator, and stop pin prevents that mover from rotating with respect to stator.
One kind such as claim 1 the electric hammer of art, it is characterized in that the dashpot in the wherein said weakening system, form by stator, mover, spring-loaded sheet, magnet exciting coil and measurement coil, stator and electric hammer shell are fixedly connected, and mover movably connects with the stator formation by means of the spring-loaded sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88220051 CN2037390U (en) | 1988-11-24 | 1988-11-24 | Electric hammer with frequency following damping system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88220051 CN2037390U (en) | 1988-11-24 | 1988-11-24 | Electric hammer with frequency following damping system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2037390U true CN2037390U (en) | 1989-05-10 |
Family
ID=4852346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88220051 Withdrawn CN2037390U (en) | 1988-11-24 | 1988-11-24 | Electric hammer with frequency following damping system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2037390U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943243A (en) * | 2010-06-25 | 2011-01-12 | 哈尔滨工程大学 | Electromagnetic type two-degree-of-freedom semi-active vibration absorber |
-
1988
- 1988-11-24 CN CN 88220051 patent/CN2037390U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101943243A (en) * | 2010-06-25 | 2011-01-12 | 哈尔滨工程大学 | Electromagnetic type two-degree-of-freedom semi-active vibration absorber |
| CN101943243B (en) * | 2010-06-25 | 2012-02-01 | 哈尔滨工程大学 | Electromagnetic type two freedom degree semi-active vibration absorber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |