CN203558731U - Crane jib stress relieving system - Google Patents
Crane jib stress relieving system Download PDFInfo
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- CN203558731U CN203558731U CN201320775025.XU CN201320775025U CN203558731U CN 203558731 U CN203558731 U CN 203558731U CN 201320775025 U CN201320775025 U CN 201320775025U CN 203558731 U CN203558731 U CN 203558731U
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- arm
- stress
- vibration
- crane jib
- crane
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- 230000001133 acceleration Effects 0.000 claims abstract description 12
- 230000035882 stress Effects 0.000 claims description 58
- 230000010355 oscillation Effects 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 abstract 4
- 230000008030 elimination Effects 0.000 description 6
- 238000003379 elimination reaction Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 206010042209 Stress Diseases 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Abstract
A crane jib stress relieving system comprises two supports, a vibration exciter, a vibration tester and a crane jib. The crane jib is transversely placed and supported on the two supports which are arranged at an interval, and the vibration exciter and the vibration tester are both mounted on the crane jib. An exciting frequency and vibration acceleration characteristic curve of the crane jib is tested by the vibration tester when the vibration exciter is started, and the vibration exciter vibrates for a certain time under a vibration stress relief frequency obtained according to the characteristic curve to eliminate machining stress of the crane jib. The machining stress of the crane jib is eliminated by means of vibration, time and labor are saved as compared with a knocking method, machining residual stress of the crane jib can be eliminated rapidly and effectively without loud noise, noise pollution is avoided, standardization production of the crane jib is benefited, influences of crane jib machining residual stress on shape and size deviation of the crane jib can be reduced, cracking of weld joints is avoided, and quality of the crane jib is improved.
Description
Technical field
The utility model relates to technical field of engineering machinery, particularly about a kind of crane arm stress, eliminates system.
Background technology
Load bearing component when crane arm is crane job is the core of hoisting crane.Structure, arm is generally U-shaped, ellipse, the prismatic straight-tube shape of polygon, by welding after sheet material bending and molding, is surrounded, and after arm moulding and welding, internal stress is very large, need to eliminate its internal stress.
Fig. 1 is a kind of schematic cross-section of existing crane arm, please refer to the drawing 1, arm by the first half 21 and the latter half 22 by being welded at A place, on, lower two parts are respectively bent and moulding by sheet material naturally, bent into shape amount is large, and weld is many, weld size is long, moulding and welding after arm accumulated inside a large amount of internal stresss, under internal stress effect, arm can produce bending, depression, wooden dipper song waits distortion, even can make weld weld seam produce the defects such as cracking, therefore need compacting, arm after welding carries out the elimination of stress before assembling, it in prior art, is the internal stress of eliminating arm, the mode of hammering is taked at scene, in position of weld and die mould position with "painted-face" character in opera, knock.
The mode that available technology adopting is knocked discharges the stress of the rear arm of processing, and because arm size is large, the process of knocking wastes time and energy; The process of knocking produces great sound, and noise emission is large, has a strong impact on operator's the sense of hearing, and occupational hazards is large; Due to production-scale expansion, the mode of existing traditional elimination arm cylinder stress is difficult to accomplish the stress of all jibs to eliminate, cause a large amount of arm cylinders not enter overstress and eliminate just directly assembling of stage, the stress eradicating efficacy of jib is difficult to guarantee, easily cause the rear stress relief of assembling, cause jib to produce defect, the safety misadventure such as serious also can cause hoisting crane folding arm, tumble.
Utility model content
In view of this, embodiment of the present utility model provides a kind of crane arm stress to eliminate system, and it no longer adopts the mode of manually knocking to eliminate the stress after arm processing, more efficient and contribute to promote the quality of arm.
Embodiment of the present utility model provides a kind of crane arm stress to eliminate system, comprises two bracing frames, vibration excitor, oscillation pickup and arms; Described two bracing frame spaces arrange, and described arm is laterally placed and is supported on described two bracing frames; Described vibration excitor and oscillation pickup are installed on described arm; Described oscillation pickup is measured exciting frequency-vibration acceleration characteristic curve of described arm when described vibration excitor starts, and described vibration excitor vibrates certain hour to eliminate the stress after described arm processing under the oscillating aging frequency drawing according to this characteristic curve.
Further, described two bracing frames are supported on respectively the two ends of described arm.
Further, each bracing frame has the arc bearing surface towards described arm, and described arm is placed on the arc bearing surface of described two bracing frames.
Further, the arc bearing surface of each bracing frame is provided with supporting pad, and described suspension arm support is on described supporting pad.
Further, described supporting pad is two cushion blocks that are embedded on arc bearing surface, described two cushion blocks are arranged on symmetrically with respect to the vertical central axis of support frame as described above on the arc bearing surface of support frame as described above, and described two cushion blocks directly contact and support described arm with the outside face of described arm.
Further, described crane arm stress is eliminated system and is also comprised anchor fitting, and described vibration excitor is arranged on described arm by this anchor fitting.
Further, described anchor fitting comprises fixture, described fixture is inverted U-shaped and is stuck on described arm, described fixture comprises two side plates that transverse slat and the two ends from described transverse slat extend to form respectively downwards, the upper plane contact of described transverse slat and described arm, described two side plates are fixed on described arm by fastener.
Further, described anchor fitting also comprises permanent seat, and described vibration excitor is fixed on the transverse slat of described fixture by described permanent seat.
Further, the installation site of described oscillation pickup on described arm is positioned at the farthest from described vibration excitor.
Further, described vibration excitor is arranged on the middle part of described arm, and described oscillation pickup is arranged on one end of described arm.
The beneficial effect that the technical scheme that embodiment of the present utility model provides is brought is: the crane arm stress that above-described embodiment provides is eliminated system and eliminated arm fabrication stress by the mode of vibration, the mode of knocking with respect to employing discharges fabrication stress, time saving and energy saving, can eliminate the unrelieved stress after arm processing effective and rapidly; Owing to not needing to knock arm cylindrical shell, can not produce great sound, avoided noise emission to the infringement in operative employee's person reason; Mode of vibration is for manually knocking, and the stress that can complete efficiently an arm is eliminated, and the standardization that is conducive to arm is produced; The effect of mode of vibration elimination arm stress will be significantly better than manually knocking, and can reduce the impact of arm forming residual stress on arm shape, dimensional discrepancy, improves the precision of arm, avoids the cracking of weld seam, thereby promote the quality of arm.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in embodiment of the present utility model, below the accompanying drawing of required use during embodiment is described is briefly described.
Fig. 1 is a kind of schematic cross-section of existing crane arm.
Fig. 2 is the perspective view that the crane arm stress of embodiment proposition of the present utility model is eliminated system.
Fig. 3 is the main TV structure schematic diagram that the crane arm stress of Fig. 2 is eliminated system.
Fig. 4 is the side-looking structural representation that the crane arm stress of Fig. 2 is eliminated system.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model embodiment is further described.
Fig. 2 is the perspective view that the crane arm stress of embodiment proposition of the present utility model is eliminated system, Fig. 3 is the main TV structure schematic diagram that the crane arm stress of Fig. 2 is eliminated system, Fig. 4 is the side-looking structural representation that the crane arm stress of Fig. 2 is eliminated system, incorporated by reference to Fig. 2 to Fig. 4, this crane arm stress elimination system, for eliminating the stress after arm processing, comprises two bracing frames 11, vibration excitor 14, oscillation pickup 17 and arm 18.Before and after two bracing frames 11 are, space arranges, and arm 18 is laterally placed and is supported on two bracing frames 11; Vibration excitor 14 and oscillation pickup 17 are installed on arm 18; Oscillation pickup 17 is measured exciting frequency-vibration acceleration characteristic curve of arm 18 when vibration excitor 14 starts, and vibration excitor 14 vibrates certain hour to eliminate the stress after arm 18 processing under the oscillating aging frequency drawing according to this characteristic curve.
Further, two bracing frames 11 are supported on respectively the two ends of arm 18.In the present embodiment, bracing frame 11 roughly takes the shape of the letter U, and each one of left and right is respectively used to support the two ends of arm 18.
Further, each bracing frame 11 has the arc bearing surface towards arm 18, and arm 18 is placed on the arc bearing surface of two bracing frames 11.
Further, the arc bearing surface of each bracing frame 11 is provided with supporting pad 12, and arm 18 is supported on supporting pad 12.Supporting pad 12 can be laid on whole arc bearing surface, also can only be arranged on the local location of arc bearing surface.Preferably, supporting pad 12 is made arc shape by elastomeric material, is convenient to arm 18 to support.
Further, in the present embodiment, supporting pad 12 is for being embedded two cushion blocks on arc bearing surface, and two cushion blocks are arranged on symmetrically with respect to the vertical central axis of bracing frame 11 on the arc bearing surface of bracing frame 11, and two cushion blocks directly contact and support arm 18 with the outside face of arm 18.In the present embodiment, four cushion blocks on two bracing frames 11 support 4 of arm 18 two ends.
Further, above-mentioned crane arm stress is eliminated system and is also comprised anchor fitting, and vibration excitor 14 is arranged on arm 18 by this anchor fitting.
Further, this anchor fitting comprises fixture 13, and fixture 13 is inverted U-shaped and is stuck on arm 18, and fixture 13 comprises two side plates that transverse slat and the two ends from transverse slat extend to form respectively downwards, the upper plane contact of transverse slat and arm 18, two side plates are fixed on arm 18 by fastener 16.Wherein, on two side plates, can be provided with mounting hole, fastener 16 can be bolt, and bolt is fixed on arm 18 through after mounting hole.
Further, this anchor fitting also comprises permanent seat 15, and vibration excitor 14 is fixed on the transverse slat of fixture 13 by permanent seat 15.Understandably, in other embodiments, on vibration excitor 14, can be wholely set the fixed sturctures such as otic placode, vibration excitor 14 can be directly installed on arm 18 by fixed sturctures such as otic placodes, thereby economizes de-chucking 13 and permanent seat 15.
Further, the installation site of oscillation pickup 17 on arm 18 is positioned at from the farthest of vibration excitor 14.
Further, in the present embodiment, vibration excitor 14 is arranged on the middle part of arm 18, and oscillation pickup 17 is arranged on one end of arm 18.That is to say, preferably oscillation pickup 17 is arranged on to the amplitude maximum of arm 18, be arranged on one end of arm 18.Oscillation pickup 17 can be made by magnetic material, thereby is pasted and fixed on arm 18 by magnetic attraction.
Narration below utilizes above-mentioned crane arm stress to eliminate principle and control step that system is carried out stress elimination to the arm after overvoltage and welding:
The first step, is lifted into arm 18 on two bracing frames 11, makes arm 18 laterally place and be supported on two bracing frames 11, and two bracing frames 11 are supported on respectively the two ends of arm 18, preferably, guarantees that the middle part of arm 18 equates with the distance of two bracing frames 11.
Second step, is arranged on vibration excitor 14 middle part of arm 18 by anchor fitting, oscillation pickup 17 is arranged on to one end of arm 18.
The 3rd step, start vibration excitor 14, by oscillation pickup 17, measured exciting frequency-vibration acceleration characteristic curve of arm 18, find out the low-frequency resonance peak of vibration acceleration, wherein low-frequency resonance peak refers in exciting frequency curve corresponding to vibration acceleration, in multiple vibration acceleration crests that exciting frequency occurs from low to high, in that acceleration/accel crest of fundamental frequency.Then, using the corresponding acceleration value in low-frequency resonance peak 2/3 as oscillating aging acceleration value, find out in the corresponding frequency of oscillating aging acceleration value that frequency lower than low-frequency resonance peak frequency as oscillating aging frequency;
The 4th step, adjusts vibration excitor 14 and vibrate certain hour under above-mentioned oscillating aging frequency, completes the elimination to arm 18 internal stresss.Wherein, be directed to middle-size and small-size jib, time of vibration can be 3 minutes to 5 minutes; Be directed to relatively large jib, time of vibration can be 5 minutes to 10 minutes.
The crane arm stress that embodiment of the present utility model proposes is eliminated system, has following beneficial effect:
1. because arm size is large, by the mode of vibration, eliminate arm fabrication stress, the mode of knocking with respect to available technology adopting discharges fabrication stress, time saving and energy saving, can eliminate the unrelieved stress after arm processing effective and rapidly;
2. the arm stress relating in the utility model is eliminated, and does not need to knock arm cylindrical shell, can not produce great sound, has avoided noise emission to the infringement in operative employee's person reason;
3. the scheme in the utility model is for manually knocking, and the stress that can complete efficiently an arm is eliminated, and the standardization that is conducive to arm is produced;
4. the scheme in the utility model, the effect that arm stress is eliminated will be significantly better than original technology, can reduce the impact of arm forming residual stress on arm shape, dimensional discrepancy, improves the precision of arm, avoids the cracking of weld seam, thereby promotes the quality of arm.
Understandably, to the change in the component shape relating in the utility model, be replacement scheme of the present utility model.For example, for the bracing frame 11 in above-described embodiment, supporting pad 12, fixture 13 and permanent seat 15, those skilled in the art can be under the prerequisite of function that meets these parts, and shape and configuration to these parts change.
In this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, except comprising those listed key elements, but also can comprise other key elements of clearly not listing.
In the situation that not conflicting, the feature in above-described embodiment and embodiment can mutually combine herein.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. crane arm stress is eliminated a system, it is characterized in that: comprise two bracing frames (11), vibration excitor (14), oscillation pickup (17) and arm (18); Described two bracing frames (11) space arranges, and described arm (18) is laterally placed and is supported on described two bracing frames (11); Described vibration excitor (14) and oscillation pickup (17) are installed on described arm (18); Described oscillation pickup (17) is measured exciting frequency-vibration acceleration characteristic curve of described arm (18) when described vibration excitor (14) starts, and described vibration excitor (14) vibrates certain hour to eliminate the stress after described arm (18) processing under the oscillating aging frequency drawing according to this characteristic curve.
2. crane arm stress as claimed in claim 1 is eliminated system, it is characterized in that: described two bracing frames (11) are supported on respectively the two ends of described arm (18).
3. crane arm stress as claimed in claim 2 is eliminated system, it is characterized in that: each bracing frame (11) has the arc bearing surface towards described arm (18), described arm (18) is placed on the arc bearing surface of described two bracing frames (11).
4. crane arm stress as claimed in claim 3 is eliminated system, it is characterized in that: the arc bearing surface of each bracing frame (11) is provided with supporting pad (12), and described arm (18) is supported on described supporting pad (12).
5. crane arm stress as claimed in claim 4 is eliminated system, it is characterized in that: described supporting pad (12) is for being embedded two cushion blocks on arc bearing surface, described two cushion blocks are arranged on symmetrically with respect to the vertical central axis of support frame as described above (11) on the arc bearing surface of support frame as described above (11), and described two cushion blocks directly contact and support described arm (18) with the outside face of described arm (18).
6. the crane arm stress as described in claim 1 to 5 any one is eliminated system, it is characterized in that: described crane arm stress is eliminated system and also comprised anchor fitting, and described vibration excitor (14) is arranged on described arm (18) by this anchor fitting.
7. crane arm stress as claimed in claim 6 is eliminated system, it is characterized in that: described anchor fitting comprises fixture (13), described fixture (13) is inverted U-shaped and is stuck on described arm (18), described fixture (13) comprises two side plates that transverse slat and the two ends from described transverse slat extend to form respectively downwards, the upper plane contact of described transverse slat and described arm (18), described two side plates are fixed on described arm (18) by fastener (16).
8. crane arm stress as claimed in claim 7 is eliminated system, it is characterized in that: described anchor fitting also comprises permanent seat (15), and described vibration excitor (14) is fixed on the transverse slat of described fixture (13) by described permanent seat (15).
9. the crane arm stress as described in claim 1 to 5 any one is eliminated system, it is characterized in that: the installation site of described oscillation pickup (17) on described arm (18) is positioned at from the farthest of described vibration excitor (14).
10. the crane arm stress as described in claim 1 to 5 any one is eliminated system, it is characterized in that: described vibration excitor (14) is arranged on the middle part of described arm (18), and described oscillation pickup (17) is arranged on one end of described arm (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775025.XU CN203558731U (en) | 2013-11-28 | 2013-11-28 | Crane jib stress relieving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775025.XU CN203558731U (en) | 2013-11-28 | 2013-11-28 | Crane jib stress relieving system |
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| Publication Number | Publication Date |
|---|---|
| CN203558731U true CN203558731U (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320775025.XU Expired - Lifetime CN203558731U (en) | 2013-11-28 | 2013-11-28 | Crane jib stress relieving system |
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| Country | Link |
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| CN (1) | CN203558731U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079661A (en) * | 2019-05-24 | 2019-08-02 | 中冶辽宁德龙钢管有限公司 | Oscillation time-effect method and timeliness movable stand in a kind of straight seam welded pipe production process |
-
2013
- 2013-11-28 CN CN201320775025.XU patent/CN203558731U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079661A (en) * | 2019-05-24 | 2019-08-02 | 中冶辽宁德龙钢管有限公司 | Oscillation time-effect method and timeliness movable stand in a kind of straight seam welded pipe production process |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140423 |
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| CX01 | Expiry of patent term |