CN104895127A - A method for determining a filling position of filler in a big arm of an excavator and a big arm structure - Google Patents
A method for determining a filling position of filler in a big arm of an excavator and a big arm structure Download PDFInfo
- Publication number
- CN104895127A CN104895127A CN201510116118.5A CN201510116118A CN104895127A CN 104895127 A CN104895127 A CN 104895127A CN 201510116118 A CN201510116118 A CN 201510116118A CN 104895127 A CN104895127 A CN 104895127A
- Authority
- CN
- China
- Prior art keywords
- large arm
- big arm
- digger
- excavator
- aluminium alloy
- 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.)
- Granted
Links
Landscapes
- Earth Drilling (AREA)
Abstract
The invention provides a method for determining a filling position of filler in a big arm of an excavator and a big arm structure. The method comprises the steps of selecting excavating working conditions of an excavator; filling different positions of the big arm structure of the excavator with filler; pasting strain foils to the corresponding positions of the excavator and making the excavator work; detecting the strain of the big arm structure on the condition of different filling schemes, the big arm structure with smaller strain having greater strength; on the basis of the same working conditions, using a vibration test system and an analyzing system to measure the inherent frequency of the big arm structure on the condition of the different filling schemes, the big arm structure with higher inherent frequency having less vibration; on the basis of the same working condition, using an acceleration sensor to measure the vibration amplitude of the big arm structure on the condition of the different filling schemes, the big arm structure with less vibration amplitude having better vibration reduction performance; determining the filling position of the filler in the big arm of the excavator according to the test results. Through the method, the specific filling position of aluminum alloy foam in the big arm can be determined.
Description
Technical field
The present invention relates to the big arm of digger structure that a kind of foam aluminium alloy is filled and the method determining filler filling position in big arm of digger, belong to engineering machinery field.
Background technology
Excavator, as the important member of engineering machinery, plays a significant role, for major contribution is made in socio-economic development in places such as building construction, road construction, municipal gardens, oilfield exploitation, disaster fields.The working portion of excavator, mainly comprises large arm, forearm and scraper bowl.Wherein, large arm, also known as swing arm, is the important process position of excavator, and the performance of the intensity of this structure, rigidity and vibration aspect directly has influence on the service behaviour of excavator.
In actual applications, excavator will bear complicated shock loading, and by the large arm configuration of conventional design method design, inside is hollow, does not have filler, there will be the situation of strength deficiency, distortion etc., affect work safety under some construction operating mode.And when the engine operating frequencies of excavator is close with its large arm intrinsic frequency, large arm configuration can produce resonance, not only produces noise, and affects operating efficiency and operating accuracy, time serious, cause security incident.Patent CN 103669452A discloses a kind of big arm of digger and forearm structure, adds filler, but result in the increase of large arm and forearm weight in large arm and forearm inside, the stressing conditions of entirety when changing excavator initial design.
Given this, need to design a kind of big arm of digger structure, do not change its original size, when keeping its weight change less, improve its intrinsic frequency, make its intrinsic frequency away from engine operating frequencies, strengthen its shock resistance and vibration absorption ability, reduce distortion during its operation.
Summary of the invention
Technical problem to be solved by this invention is, do not changing its original size, when keeping its weight change less, a kind of big arm of digger structure is provided, compared with common large arm configuration, improve its intrinsic frequency, impact resistance and vibration absorption ability, reduce its vibration when operation, reduce distortion during its operation.
A kind of big arm of digger structure designed by the present invention, its shape is identical with ordinary excavator, under the prerequisite improving large arm structural performance, selects the inner specific position of large arm, carries out the filling of foam aluminium alloy.And tested by comparison of design, determine the filling position of foam aluminium alloy, concrete scheme is as follows:
Determine a method for foam aluminium alloy filling position in big arm of digger, as follows:
Step 1 chooses the digging working condition of excavator;
Step 2 is at the diverse location filled and process aluminium alloys of big arm of digger structure;
Step 3, under the operating mode of step 1, make excavator work; According to the position of setting, foil gauge is attached to the relevant position of excavator, detects the large arm structural strain under different padding scheme, strain less large arm configuration, its intensity is better;
Step 4, under identical working condition, use vibration test system and analytical system to measure the intrinsic frequency of the lower large arm configuration of above-mentioned different padding scheme, the large arm configuration that intrinsic frequency is higher, vibrates less;
Step 5, under identical working condition, measured the large arm structural vibration amplitude under above-mentioned different padding scheme by acceleration transducer; The large arm configuration that Oscillation Amplitude is less, its damping property is higher;
Step 6, according to above-mentioned result of the test, select that strain is minimum, intrinsic frequency is maximum, amplitude is minimum scheme, determine foam aluminium alloy filling position in big arm of digger.
Operating mode described in step 1 comprises three kinds:
1), excavator is in maximum digging radius at floor level place, and scraper bowl excavates, and scraper bowl excavates in performance maximum digging force position;
2), excavator be in deep-cut most pick position, scraper bowl excavate, scraper bowl performance maximum digging force position excavate;
3), large arm, dipper be in maximum weighted position, and scraper bowl excavates in performance maximum digging force position.
The method detecting intrinsic frequency in step 4 is as follows:
Utilizing hammer to hit at random at the diverse location of large arm makes large arm produce vibration, changes acceleration transducer position, carries out several test; By in measurement result accurately three groups of data carry out Fast Fourier Transform (FFT), produce obvious crest at some frequency values place, this frequency values is exactly the intrinsic frequency value of big arm of digger structure.
Acceleration transducer described in step 4 is arranged on large arm surface.
In step 3, the large arm configuration in each padding scheme is measured the ess-strain situation of eight points, eight strain gauge adhesion points enclose around large arm one.
In step 6 in large arm inner filled and process aluminium alloys method be:
1 according to above-mentioned result of the test, determines foam aluminium alloy filling position in big arm of digger;
2, according to the size of large arm, determine the filling size of foam aluminium alloy, and go out foam aluminium alloy according to dimensioned;
3 in big arm of digger plate welding process, foam aluminium alloy is filled in large arm inside, and adopts cementing agent large arm and foam aluminium alloy to be bondd.
A big arm of digger for filled and process aluminium alloys, is filled with foam aluminium alloy at the filling position of the determined big arm of digger of said method.
The large arm configuration of described ordinary excavator, excavator rated power is 110KW, and large arm lengths is 5650mm, and each sheet material of large arm is welded by the 16Mn steel of different-thickness.
The Al alloy powder of oxidation mixes with separating substance in heating and gasifying process and obtains by described foamed Al-allov mutually.It has the following advantages: density is little, and specific stiffness is high, and its bending resistance specific stiffness is 1.5 times of steel, and damping characteristics is high, and impact energy absorb rate is high.In addition, it has the good characteristics of being convenient to process, and can saw, can cut, can dig, millable etc., is easily processed into sheet material, web, bar and various profiled piece.
Foam aluminium alloy density of the present invention is 0.6g/cm
3, density is less, and after being filled into large arm inside, the weight that large arm increases can be ignored, and therefore the filling of foam aluminium alloy can not produce larger impact to overall stressed grade of excavator.In addition, its compressive strength 12MPa, flexural strength is 10MPa, and tensile strength is 6MP, and shock-absorbing capacity is high, and energy absorption is received can reach 25J/cm
3, damping capacity is high, and the foamed aluminium in-fighting factor reaches 6 × 10
-3 .
Beneficial effect of the present invention:
The filling position of foam aluminium alloy specifically in large arm can be determined by method of the present invention, and reduce the distortion of large arm when excavator operation by filled and process aluminium alloys in large arm, measure through test, at the same conditions, large arm of the present invention more common large arm strain reduction about 10%; Improve intrinsic frequency and the resistance to shock of big arm of digger, reduce the vibration of excavator when operation, measure through test, intrinsic frequency improves about 8%, and Mean Oscillation amplitude reduces about 15%.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 (a)-Fig. 1 (e) is the padding scheme schematic diagram of foam aluminium alloy;
Fig. 2 is the large arm schematic diagram that foam aluminium alloy is filled;
Fig. 3 is strain gauge adhesion position view;
Fig. 4 is ess-strain detection system schematic diagram;
Fig. 5 is vibrational system instrumentation plan;
In figure, 1: large arm sheet material, 2: cementing agent, 3: foam aluminium alloy.
Detailed description of the invention
In order to above-mentioned feature and advantage of the present invention can be expressly understood, by embodiment below, large for the present invention arm configuration and common large arm configuration are contrasted.
Selected ordinary excavator large arm structural reference model excavator, excavator rated power is 110KW, and large arm lengths is 5650mm, and each sheet material of large arm is welded by the 16Mn steel of different-thickness.
Design 5 kinds of padding schemes, as shown in Fig. 1 (a)-Fig. 1 (e), wherein
Fig. 1 (a) is scheme 1: for all not filling;
Fig. 1 (e) is scheme 5: be whole filling;
Fig. 1 (b)-Fig. 1 (d) is scheme 2,3,4: be selective filling.
As shown in Figure 2, large arm shape is identical with common large arm, inner filled and process aluminium alloys, and as shown in Figure 2, foam aluminium alloy 3 is bonded in large arm sheet material by cementing agent 2 in its cross section for the large arm structural representation that foam aluminium alloy is filled.
Carry out contrast test, test apparatus is made up of existing dynamic strain measuring system and vibration test system, the ess-strain of dynamic strain measuring systematic survey big arm of digger, and Vibration Testing System gathers the vibration signal of large arm.
Concrete test procedure is as follows:
1) the work operating mode of digging machine is determined:
The first operating mode: excavator is in maximum digging radius at floor level place, scraper bowl excavates, and scraper bowl excavates in performance maximum digging force position;
The second operating mode: excavator is in and deep-cuts pick position most, and scraper bowl excavates, and scraper bowl excavates in performance maximum digging force position;
The third operating mode: large arm, dipper are in maximum weighted position, scraper bowl excavates in performance maximum digging force position.
2) padding scheme in 5 is designed, if Fig. 1 (a) is scheme 1: for all not filling; If Fig. 1 (e) is scheme 5: be whole filling; If Fig. 1 (b)-Fig. 1 (d) is scheme 2,3,4: be selective filling.
3) according to the loading characteristic of large arm, the large arm configuration in each padding scheme is measured the ess-strain situation of eight points, the position of strain gauge adhesion point as shown in Figure 3.For detecting the vibration of large arm when operation, degree of will speed up sensor is arranged on large arm surface.
4), operation excavator works under above-mentioned three kinds of selected operating modes, and detect in real time the strain of 5 kinds of scheme large arm survey marks, as shown in Figure 4, meanwhile acceleration transducer gathers the vibration signal of large arm to detection system schematic diagram;
5), by the strain of 5 kinds of schemes contrast, as calculated, discovery scheme 3 and scheme 5 strain less, and more common large arm structural strain reduces about 10%.By the vibration signal contrast collected in 5, find that scheme 3 reduces about 15% with the more common large arm configuration of Mean Oscillation amplitude of scheme 5.
6) method, measuring intrinsic frequency utilizes hammer to hit at random at the diverse location of large arm and make large arm produce vibration, changes acceleration transducer position, carry out several test.Good for measurement result three groups of data are carried out Fast Fourier Transform (FFT), and can see that some frequency values place produces obvious crest, this frequency values is just likely the intrinsic frequency value of big arm of digger structure.Large arm vibration test system schematic diagram as shown in Figure 4.
7), measure the intrinsic frequency of 5 kinds of large arm configurations respectively by method in 4, find through contrast, the more common large arm of scheme 3 large arm structural natural frequencies improves about 8%, and the more common large arm of scheme 5 large arm structural natural frequencies improves about 8.5%.
To sum up result, and consider the problem such as foam aluminium alloy cost and construction store doses, preferred foam aluminium alloy padding scheme is scheme 3.
Large arm inner filled and process aluminium alloys method is:
1 according to above-mentioned result of the test, determines foam aluminium alloy filling position in big arm of digger;
2, according to the size of large arm, determine the filling size of foam aluminium alloy, and go out foam aluminium alloy according to dimensioned;
3 in big arm of digger plate welding process, foam aluminium alloy is filled in large arm inside, and adopts cementing agent large arm and foam aluminium alloy to be bondd.
According to above-mentioned test structure, obtain a kind of big arm of digger of filled and process aluminium alloys, be characterized in, be filled with foam aluminium alloy at the filling position of the determined big arm of digger of said method.
The Al alloy powder of oxidation mixes with separating substance in heating and gasifying process and obtains by foamed Al-allov mutually, is a kind of current material; It has the following advantages: density is little, and specific stiffness is high, and its bending resistance specific stiffness is 1.5 times of steel, and damping characteristics is high, and impact energy absorb rate is high.In addition, it has the good characteristics of being convenient to process, and can saw, can cut, can dig, millable etc., is easily processed into sheet material, web, bar and various profiled piece.
Foam aluminium alloy density of the present invention is 0.6g/cm
3, density is less, and after being filled into large arm inside, the weight that large arm increases can be ignored, and therefore the filling of foam aluminium alloy can not produce larger impact to overall stressed grade of excavator.In addition, its about compressive strength 12MPa, flexural strength is about 10MPa, and tensile strength is about 6MP, and shock-absorbing capacity is high, and energy absorption is received can reach 25J/cm
3left and right, damping capacity is high, and the foamed aluminium in-fighting factor reaches 6 × 10
-3 .
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. determine a method for filler filling position in big arm of digger, it is characterized in that, as follows:
Step 1 chooses the digging working condition of excavator;
Step 2 fills filler at the diverse location of big arm of digger structure;
Step 3, according to setting position, foil gauge is attached to the relevant position of excavator, under the operating mode of step 1, makes excavator work; Detect the large arm structural strain under different padding scheme, strain less large arm configuration, its intensity is better;
Step 4, under identical working condition, use vibration test system and analytical system to measure the intrinsic frequency of the lower large arm configuration of above-mentioned different padding scheme, the large arm configuration that intrinsic frequency is higher, vibrates less;
Step 5, under identical working condition, measured the large arm structural vibration amplitude under above-mentioned different padding scheme by acceleration transducer; The large arm configuration that Oscillation Amplitude is less, its damping property is higher;
Step 6, according to above-mentioned result of the test, select that strain is minimum, intrinsic frequency is maximum, amplitude is minimum scheme, determine filler filling position in big arm of digger.
2. determine the method for filler filling position in big arm of digger as claimed in claim 1, it is characterized in that: the operating mode described in step 1 comprises three kinds of operating modes:
1), excavator is in maximum digging radius at floor level place, and scraper bowl excavates, and scraper bowl excavates in performance maximum digging force position;
2), excavator be in deep-cut most pick position, scraper bowl excavate, scraper bowl performance maximum digging force position excavate;
3), large arm, dipper be in maximum weighted position, and scraper bowl excavates in performance maximum digging force position.
3. determine the method for filler filling position in big arm of digger as claimed in claim 1, it is characterized in that: the method detecting intrinsic frequency in step 4 is as follows:
Utilizing hammer to hit at random at the diverse location of large arm makes large arm produce vibration, changes acceleration transducer position, carries out several test; By in measurement result accurately three groups of data carry out Fast Fourier Transform (FFT), produce obvious crest at some frequency values places, this frequency values is exactly the intrinsic frequency value of big arm of digger structure.
4. determine the method for filler filling position in big arm of digger as claimed in claim 3, it is characterized in that: the acceleration transducer described in step 4 is arranged on large arm surface.
5. determine the method for filler filling position in big arm of digger as claimed in claim 1, it is characterized in that: the ess-strain situation large arm configuration in each padding scheme being measured eight points, eight strain gauge adhesion points enclose around large arm one.
6. determine the method for filler filling position in big arm of digger as claimed in claim 1, it is characterized in that: the filler in step 6 is foam aluminium alloy, in large arm inner filled and process aluminium alloys method be:
6-1, according to above-mentioned result of the test, determines foam aluminium alloy filling position in big arm of digger;
6-2, according to the size of large arm, determines the filling size of foam aluminium alloy, and goes out foam aluminium alloy according to dimensioned;
Foam aluminium alloy, in big arm of digger plate welding process, is filled in large arm inside by 6-3, and adopts cementing agent large arm and foam aluminium alloy to be bondd.
7. a large arm configuration, is characterized in that, is filled with foam aluminium alloy at the filling position of the determined big arm of digger of claim 1.
8. large arm configuration as claimed in claim 7, it is characterized in that, described foam aluminium alloy density is 0.6g/cm
3.
9. large arm configuration as claimed in claim 7, it is characterized in that, the compressive strength of described foam aluminium alloy is 12MPa, and flexural strength is 10MPa, and tensile strength is 6MPa, and energy absorption is received as 25J/cm
3, the foamed aluminium in-fighting factor reaches 6 × 10
-3.
10. large arm configuration as claimed in claim 7, it is characterized in that, described foam aluminium alloy is bonded in the inside of big arm of digger by cementing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510116118.5A CN104895127B (en) | 2015-03-17 | 2015-03-17 | Determine the implant method of filling position and big arm configuration in big arm of digger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510116118.5A CN104895127B (en) | 2015-03-17 | 2015-03-17 | Determine the implant method of filling position and big arm configuration in big arm of digger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104895127A true CN104895127A (en) | 2015-09-09 |
| CN104895127B CN104895127B (en) | 2017-03-01 |
Family
ID=54028056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510116118.5A Expired - Fee Related CN104895127B (en) | 2015-03-17 | 2015-03-17 | Determine the implant method of filling position and big arm configuration in big arm of digger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104895127B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914508A (en) * | 2019-03-29 | 2019-06-21 | 三一重机有限公司 | A kind of excavator boom and excavator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003082705A (en) * | 2001-09-10 | 2003-03-19 | Hitachi Constr Mach Co Ltd | Turning frame of construction machine and its of manufacturing method |
| JP2014074339A (en) * | 2012-10-02 | 2014-04-24 | Komatsu Ltd | Engine unit |
| CN203716198U (en) * | 2013-12-26 | 2014-07-16 | 山河智能装备股份有限公司 | Detection device for strength of movable arm of excavator |
| CN203834532U (en) * | 2014-04-24 | 2014-09-17 | 东莞市海德机械有限公司 | Rock drilling arm and strong rock drilling arm excavator |
-
2015
- 2015-03-17 CN CN201510116118.5A patent/CN104895127B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003082705A (en) * | 2001-09-10 | 2003-03-19 | Hitachi Constr Mach Co Ltd | Turning frame of construction machine and its of manufacturing method |
| JP2014074339A (en) * | 2012-10-02 | 2014-04-24 | Komatsu Ltd | Engine unit |
| CN203716198U (en) * | 2013-12-26 | 2014-07-16 | 山河智能装备股份有限公司 | Detection device for strength of movable arm of excavator |
| CN203834532U (en) * | 2014-04-24 | 2014-09-17 | 东莞市海德机械有限公司 | Rock drilling arm and strong rock drilling arm excavator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914508A (en) * | 2019-03-29 | 2019-06-21 | 三一重机有限公司 | A kind of excavator boom and excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104895127B (en) | 2017-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Mooney et al. | Vibratory roller integrated measurement of earthwork compaction: An overview | |
| JP5867957B2 (en) | Method and system for predicting rock strength | |
| CN102175771B (en) | Method for detecting steel tube void of concrete filled steel tube (CFST) arch bridge by utilizing transient impact method | |
| CN107192624A (en) | A kind of concrete strength detecting method based on impact elasticity ripple | |
| CN103335747B (en) | Prestress wire stretching force intelligent detecting method | |
| CN107288162B (en) | Device and method for detecting pile bottom sediment thickness of bored concrete pile | |
| CN204401664U (en) | A kind of castinplace pile pile bottom sediment and pile end groundwork checkout gear | |
| CN104931363A (en) | Jointed rock deformation modulus testing method | |
| CN106066289A (en) | A kind of shear wave velocity dynamic penetration test device | |
| Biswas et al. | Experimental and theoretical studies on the nonlinear characteristics of soil-pile systems under coupled vibrations | |
| CN110220978A (en) | A kind of longitudinal wave guide monitoring method for tailings warehouse dam body dam break early warning | |
| KR101756755B1 (en) | System for evaluating impact safety of leveling tool for offshore wind turbine, and method for the same | |
| Finno et al. | Non-destructive evaluation of a deep foundation test section at the Northwestern University national geotechnical experimentation site | |
| CN104018506A (en) | Pile-forming process dynamic testing device for underwater sand compaction pile | |
| CN104895127A (en) | A method for determining a filling position of filler in a big arm of an excavator and a big arm structure | |
| CN108919340A (en) | A kind of single-hole method wave velocity testing method, apparatus and terminal device | |
| Svinkin | Prediction and calculation of construction vibrations | |
| CN112130196A (en) | Pendulum impact testing device and method for tunnel wall surrounding rock stress wave attenuation measurement | |
| Altun et al. | Liquefaction resistance of sand reinforced with geosynthetics | |
| CN106894762A (en) | A kind of control method of bored concrete pile impact holing | |
| CN110528601B (en) | High-strain-based single-pile bearing capacity detection device and method for PHC-steel pipe combined pile | |
| Shaban et al. | Comparative analyses of granular pavement moduli measured from lightweight deflectometer and miniaturized pressuremeter tests | |
| JP3732719B2 (en) | Method and apparatus for measuring ground subsidence | |
| Holmsgaard et al. | Interpretation of seismic cone penetration testing in silty soil | |
| CN110306606B (en) | Pile foundation quality monitoring method and device for construction process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170301 Termination date: 20200317 |