CN105091773B - Detection means for forklift door frame deflection metrology - Google Patents

Detection means for forklift door frame deflection metrology Download PDF

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Publication number
CN105091773B
CN105091773B CN201510287598.1A CN201510287598A CN105091773B CN 105091773 B CN105091773 B CN 105091773B CN 201510287598 A CN201510287598 A CN 201510287598A CN 105091773 B CN105091773 B CN 105091773B
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laser pen
laser
door frame
pole
fixed
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CN105091773A (en
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李佳伟
韩志刚
王军
程鹏
孙良山
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Anhui Heli Co Ltd
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Anhui Heli Co Ltd
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  • Length Measuring Devices By Optical Means (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The present invention relates to the detection means for forklift door frame deflection metrology.Including laser pen, bindiny mechanism, cantilever-shaped pole and auxiliary ropes;The laser pen is suspended in the side of pole by bindiny mechanism, and laser pen is oblique with vertical direction, and Laser emission mouth is downward;One end of auxiliary ropes is fixed on deep bead, and the other end naturally droops;The upper end of deep bead is connected to pole, and positioned at the rear of laser pen, and auxiliary ropes are correspondingly located at the dead astern of laser pen.During for detecting, the opposite side of pole is fixed on gear shelf, and in horizontal shaft-like;For the Laser emission mouth of laser pen against ground in front of forklift door frame, the other end of auxiliary ropes, which naturally droops, is dragged to ground.Apparatus of the present invention are used to detect not to be limited by indoor and outdoor, can also be measured in the condition that there is wind outdoor, be greatly reduced influence of the environment to measurement amount of deflection.

Description

Detection means for forklift door frame deflection metrology
Technical field
The invention belongs to fork truck technical field, and in particular to the measurement of forklift door frame amount of deflection.
Background technology
Due to reasons such as machining accuracy, roller gap and stress deformations, pallet fork is caused to produce displacement forward together with gear shelf, The displacement is door frame amount of deflection described in industry.At present, the method for forklift door frame deflection metrology is vertical method, and this method is main Carry out indoors, vertical is fixed on gear shelf line home position mark of going forward side by side, shelf is then kept off and rises to door frame top;This When, vertical is together moved forward with gear shelf and is marked again, then the distance of vertical mark position is exactly that door frame is scratched twice Angle value.
The problem of vertical method measurement forklift door frame amount of deflection is present:Definitely it can only carry out indoors under calm environment, still More than 12.5 meters of high door frame can not then be measured indoors due to chamber height limitation.Even if experiment shows outdoor wind very It is small, but because door frame is high and plumb line is very long, the wind of very little can also have a huge impact to measurement result.Gu vertical Method is infeasible in the high door frame amount of deflection of outdoor measurement.In addition, high door frame plumb line is long, then vertical balance is more difficult, I.e. using Hand supplementary its balance be also required to longer time can be only achieved stabilization, if one disturbance balance i.e. be broken.
The content of the invention
In order to solve problem present in forklift door frame deflection metrology, the present invention provides a kind of forklift door frame amount of deflection that is used for and surveyed The detection means of amount.
Detection means for forklift door frame deflection metrology includes laser pen hitch and laser range finder;The laser Hitch includes laser pen 8, bindiny mechanism, cantilever-shaped pole 1 and auxiliary ropes 10;The laser pen 8 passes through connection Mechanism is suspended in the side of pole 1, and laser pen 8 and vertical direction are oblique, and Laser emission mouth is downward;The auxiliary ropes 10 one end is fixed on deep bead 9, and the other end of auxiliary ropes 10 naturally droops;The upper end of the deep bead 9 is connected to Pole 1, and positioned at the rear of laser pen 8, and auxiliary ropes 10 are corresponding positioned at the dead astern of laser pen 8;
During for detecting, the opposite side of the pole 1 of the laser pen hitch is fixed on the gear goods of tested forklift door frame On frame, pole 1 is shaft-like in level, and parallel to gear shelf front end face;The Laser emission mouth of laser pen 8 is against in front of forklift door frame Ground;The laser range finder is correspondingly placed at the underface of the pallet fork of laser pen hitch side.
The bindiny mechanism includes U-clamp block 7, connecting plate 6, mounting blocks 5, fixed block 4 and cotton thread 2;The connecting plate 6 is in Vertical, U-clamp block 7 are fixed on the bottom of connecting plate 6, and laser pen 8 is installed on U-clamp block 7;Mounting blocks 5 are fixed on U-clamp On the connecting plate 6 of the top of block 7;The top of the mounting blocks 5, which coordinates, is fixed with fixed block 4, and the cotton thread 2 is fixed on fixed block On 4, the both ends of cotton thread 2 respectively connected pole 1, and it is in hanging like to make bindiny mechanism.
The deep bead 9 is in horizontal U-board shape, and bindiny mechanism is located at the middle part of deep bead 9, and the outgoing of laser pen 8 Light end correspond to the opening of deep bead 9.
The auxiliary ropes 10 are 0.1~0.2cm of diameter flexible rope.
Fixing point of the one end of auxiliary ropes 10 on deep bead 9 is higher than the top surface of the fixed block 4 in bindiny mechanism, height Difference is more than 10mm.
The cotton thread 2 is 0.1~0.2cm of diameter cotton thread.
The advantageous effects of the present invention embody in the following areas:
Do not limited by indoor and outdoor 1. apparatus of the present invention are used to detect, can also be measured in the condition that there is wind outdoor, Greatly reduce influence of the environment to measurement amount of deflection.
2. the laser pen of the present apparatus is arranged to angled with ground(Any angle between 0 ° to 90 ° in theory, without 0 °), Requirement laser pen need not be tried can just obtain deflection value perpendicular to ground.This make it that measurement process is very simple.For measuring Facilitate and consider measurement error, it is 26.5 °~30 ° to recommend laser pen and vertical direction angle here.
3. experiment proves, the auxiliary cotton thread of the present apparatus can make laser pen hitch reach stable state or make small rapidly Simple harmonic motion, this small simple harmonic motion can be easily found equilbrium position point with let us, and allow in measurement error In the range of.
4. when OA uncertainty is ± 1 millimeter, OB uncertainty is ± 4 millimeters, and OC uncertainty is ± 1 milli Rice, when h2-h1 uncertainty is ± 2.5 millimeters, the error of door frame deflection metrology result is ± 14.9 millimeters.Experiment proves Measurement accuracy requirement can be met., as a result will be more accurate if each measurement accuracy further improves.
5. the present apparatus is hung using two cotton threads(Because we are only concerned the amount of deflection of door frame in the longitudinal direction, institute Limited with the rotary freedom to laser pen apparatus horizontal direction), can effectively prevent laser pen from doing unnecessary rotation fortune It is dynamic.Improve testing efficiency and accuracy.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention;
Fig. 2 is detailed structure schematic diagram of the present invention;
Fig. 3 is the original state figure for detection;
Detection means is raised to the state diagram at the top of door frame when Fig. 4 is for detecting;
Fig. 5 is measuring principle figure.
Sequence number in upper figure:Pole 1, cotton thread 2, briquetting 3, fixed block 4, mounting blocks 5, connecting plate 6, U-clamp block 7, laser pen 8th, deep bead 9, auxiliary ropes 10, door frame 11, gear shelf 12, pallet fork 13, laser range finder 14.
Embodiment
The theoretical formula of institute's foundation of the present invention is derived and is described as follows:
As seen from Figure 5, when measurement apparatus is in M1During position, C points are the Laser emission mouth of laser pen 8, and O points are C points Vertical point, A points are the point that now laser is got on ground.When gear shelf and pallet fork 13 are from M1Position rises to extreme higher position M2When, Due to door frame deformation and rigging error etc., shelf and pallet fork are kept off by M2It is displaced to M3Position, laser pen hitch is therewith to reach Dynamic, now D points are Laser emission mouth, and F points are the vertical point of D points, and B points are the point that laser is got on ground.Because fixed laser The device of pen 8 is sling with cotton thread, as long as the center of gravity of the hitch of installation laser pen 8 is constant, the tiltangleθ of laser pen 8 It is constant.So horizontal range CE is door frame deflection value.
Make straight line CH parallel to OB, hand over DF in E points, cross E and be EG parallel to DB, then have as previously described DF ∥ OC, ∠ OCA= ∠ FDB, CE=AG knowable to geometrical relationship, and AG=OB-OA-GB, and because GB=EH=DE tan θ, and tan θ=OA/OC.
So deflection value:(1)
Wherein,
So(2)
Formula(2)In CE be high door frame deflection value.
Below in conjunction with the accompanying drawings, the present invention is further described by embodiment.
Embodiment
Referring to Fig. 1 and Fig. 5, the detection means for forklift door frame deflection metrology includes laser pen hitch and Laser Measuring Distance meter 14.Laser range finder 14 is hand-held laser rangefinder.Laser pen hitch includes laser pen 8, bindiny mechanism, cantilever The pole 1 of shape and auxiliary ropes 10.Laser pen 8 is suspended in the side of pole 1, laser pen 8 and vertical direction by bindiny mechanism Obliquely, and Laser emission mouth is downward.
Bindiny mechanism includes U-clamp block 7, connecting plate 6, mounting blocks 5, fixed block 4 and cotton thread 2.Connecting plate 6 is in vertical, U Clevis block 7 is fixed on the bottom of connecting plate 6, and laser pen 8 is installed on U-clamp block 7, sees Fig. 2;Mounting blocks 5 are fixed on U-clamp block On the connecting plate 6 of 7 tops;The top of mounting blocks 5, which coordinates, is installed with fixed block 4, and cotton thread 2 is fixed on fixed block 4, cotton thread 2 both ends respectively connected pole 1, and it is in hanging like to make bindiny mechanism.Cotton thread 2 is diameter 0.2cm cotton thread.
Deep bead 9 is in horizontal U-board shape, and bindiny mechanism is located at the middle part of deep bead 9, and the Laser emission of laser pen 8 Mouth correspond to the opening of deep bead 9.The upper end of deep bead 9 is connected to pole 1, and positioned at the rear of laser pen 8.
Auxiliary ropes 10 are diameter 0.2cm flexible rope, and one end is fixedly installed on deep bead 9, and fixing point is higher than company The top surface of fixed block 4 on connection mechanism, difference in height 10mm.The other end naturally droops;Auxiliary ropes 10 are corresponding to be located at laser pen 8 Dead astern.
The present invention is as follows for the measurement operation of 12.5 meters high of three-level door frame amount of deflection:
It is fully loaded with 1. vehicle to be measured is travelled to physical features esplanade, vehicle, and ensures that fork truck has been fully loaded with when rising to top still Keep stable, adjust outer portal frame of forklift by inclinometer so that door frame is in plumbness.
2. referring to Fig. 3, measurement apparatus is arranged on gear shelf 12, the Laser emission mouth of laser pen 8 is away from the bottom of pallet fork 13 About 300 millimeters of height.It is 28 ° to adjust laser pen 8 and the angle of vertical direction, and the raising of shelf 12 will be kept off after installing To 1.7 meters away from ground or so height of pallet fork, measurement original state is referring to Fig. 3.With the hand steered laser pen hitch surely rocked, use Vertical finds Laser emission mouth C points, sees Fig. 5, to the vertical point O points on ground, the O points in Fig. 5, and be marked with marking pen.
3. referring to Fig. 5, OC height is measured with meter ruler, survey is averaged three times, OC=1992 millimeter.
4. referring to Fig. 5, laser pen 8 can incident point A, A points be on the ground now the round spots that a radius is 3 millimeters, Measure the laser spots A center of circle to average three times to the distance OA of O points, survey, OA=1194 millimeter.
5. referring to Fig. 5, laser range finder 14 is placed on immediately below pallet fork 13, to measure pallet fork away from ground level h1. Recommend to be disposed close to immediately below the pallet fork of laser pen hitch side.And by laser range finder set-point and laser ranging Instrument does zone marker in pallet fork institute dotted areas(In order to which result is accurate, measure as far as possible close to height of the pallet fork root position away from ground Degree), when the purpose of mark is that door frame rises to top, laser range finder ranging is also used in this position, reduces error, h1=1696 Millimeter.
6. referring to Fig. 4, door frame is risen into extreme higher position M2, now because door frame deforms and manufactures the reasons such as rigging error, Shelf 12 and pallet fork 13 are kept off by M2Position is displaced to M3Position, laser pen hitch moves, and acutely swings.Pull auxiliary Rope 10 is helped, when initial, because auxiliary ropes 10 are fixed on deep bead 9, is not contacted with laser pen hitch, auxiliary ropes 10 Fixing point be higher than laser pen hitch.So auxiliary ropes 10 are stretched about fixing point towards laser pen hitch It is close, laser pen hitch is gradually touched, until laser pen hitch stops swinging, illustrates laser pen hitch auxiliary Help in the presence of rope 10 and deviate from equilbrium position, now, keep auxiliary ropes 10 to stretch and slow counter motion, until auxiliary Rope 10 leaves laser pen hitch, appoints laser hitch to hang naturally vertical.Repeating above-mentioned action can make acutely to shake several times Laser pen hitch fast and stable in dynamic makees small simple harmonic motion, between measuring now laser spots B to point O with meter ruler Distance OB.If laser spots B does small simple harmonic motion, its equilbrium position point is estimated(Toward the midpoint of complex amplitude)As B points, survey Amount is averaged three times, OB=7640 millimeter.
7. referring to Fig. 5, laser range finder is placed on the position that the 5th step marked gets ranging ready to pallet fork marked region and obtain To distance h2, h2=12263 millimeter.
Above measurement data is brought into formula(2)In calculated, l is high door frame deflection value.
l=(7640-1194)-(12263-1696)× 1194/1992=112.16 millimeters
So the deflection value of this 12.5 meters high three-level door frames is 112.16 millimeters.
Error analysis:When OA uncertainty is ± 1 millimeter, OB uncertainty is ± 4 millimeters, and OC uncertainty is ± 1 millimeter, when h2-h1 uncertainty is ± 2.5 millimeters, the error of door frame deflection metrology result is ± 14.9 millimeters.The mistake Difference is in allowed band.
Explanation:The measuring method of secondary gantry is same as above.For reach truck, because its gantry angle can not be adjusted, so Zero load is surveyed once, is fully loaded with and is surveyed once, will measurement result does subtraction twice is door frame amount of deflection, measuring method is also same as above.

Claims (4)

1. the detection means for forklift door frame deflection metrology, it is characterised in that:Including laser pen hitch and laser ranging Instrument;The laser pen hitch includes laser pen(8), bindiny mechanism, cantilever-shaped pole(1)And auxiliary ropes(10);Institute State laser pen(8)Pole is suspended in by bindiny mechanism(1)Side, laser pen(8)It is oblique with vertical direction, and laser Emission port is downward;The auxiliary ropes(10)One end be fixed at deep bead(9)On, auxiliary ropes(10)The other end it is natural It is sagging;The deep bead(9)Upper end be connected to pole(1), and it is located at laser pen(8)Rear, and auxiliary ropes(10)It is right Laser pen should be located at(8)Dead astern;
The bindiny mechanism includes U-clamp block(7), connecting plate(6), mounting blocks(5), fixed block(4)And cotton thread(2);The company Fishplate bar(6)In vertical, U-clamp block(7)It is fixed on connecting plate(6)Bottom, laser pen(8)It is installed in U-clamp block(7)On; Mounting blocks(5)It is fixed on U-clamp block(7)The connecting plate of top(6)On;The mounting blocks(5)Top coordinate be fixed with Determine block(4), the cotton thread(2)It is fixed on fixed block(4)On, cotton thread(2)Both ends respectively connected pole(1), make connection machine Structure is in hanging like;
The deep bead(9)In horizontal U-board shape, bindiny mechanism is located at deep bead(9)Middle part, and laser pen(8)Go out Penetrate light end and correspond to deep bead(9)Opening;
During for detecting, the pole of the laser pen hitch(1)Opposite side be fixed on the gear shelf of tested forklift door frame On, pole(1)It is shaft-like in level, and parallel to gear shelf front end face;Laser pen(8)Laser emission mouth against before forklift door frame The ground of side;The laser range finder is correspondingly placed at the underface of the pallet fork of laser pen hitch side.
2. the detection means according to claim 1 for forklift door frame deflection metrology, it is characterised in that:The auxiliary rope Rope(10)For 0.1~0.2cm of diameter flexible rope.
3. the detection means according to claim 1 for forklift door frame deflection metrology, it is characterised in that:Auxiliary ropes (10)One end in deep bead(9)On fixing point higher than the fixed block in bindiny mechanism(4)Top surface, difference in height be 10mm with On.
4. the detection means according to claim 1 for forklift door frame deflection metrology, it is characterised in that:The cotton thread (2)For 0.1~0.2cm of diameter cotton thread.
CN201510287598.1A 2015-05-29 2015-05-29 Detection means for forklift door frame deflection metrology Active CN105091773B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105783718B (en) * 2016-03-31 2018-08-31 浙江工业大学 A kind of device carrying out guard frame rail length detection automatically using industrial camera
CN107290116A (en) * 2017-07-31 2017-10-24 安徽合力股份有限公司 A kind of detection means of forklift door frame deflection metrology
CN115327560B (en) * 2022-08-11 2024-05-07 天津市特种设备监督检验技术研究院(天津市特种设备事故应急调查处理中心) Device and method for detecting natural slipping quantity of forklift fork based on laser reflection

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS5965205A (en) * 1982-10-05 1984-04-13 Kawasaki Steel Corp Optical displacement measuring device
JPS6416906A (en) * 1987-07-10 1989-01-20 Iwatsu Electric Co Ltd Displacement gage utilizing laser light
CN1651855A (en) * 2005-02-06 2005-08-10 重庆大学 2-D, large range laser deflection / displacement measuring method and apparatus
CN204165541U (en) * 2014-11-12 2015-02-18 金陵科技学院 A kind of angle measurement unit
CN205037874U (en) * 2015-05-29 2016-02-17 安徽合力股份有限公司 Detection apparatus for be used for fork truck portal amount of deflection to measure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5965205A (en) * 1982-10-05 1984-04-13 Kawasaki Steel Corp Optical displacement measuring device
JPS6416906A (en) * 1987-07-10 1989-01-20 Iwatsu Electric Co Ltd Displacement gage utilizing laser light
CN1651855A (en) * 2005-02-06 2005-08-10 重庆大学 2-D, large range laser deflection / displacement measuring method and apparatus
CN204165541U (en) * 2014-11-12 2015-02-18 金陵科技学院 A kind of angle measurement unit
CN205037874U (en) * 2015-05-29 2016-02-17 安徽合力股份有限公司 Detection apparatus for be used for fork truck portal amount of deflection to measure

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