CN105738097A - Combination jib detection bench for automobile crane and detection method thereof - Google Patents
Combination jib detection bench for automobile crane and detection method thereof Download PDFInfo
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- CN105738097A CN105738097A CN201610238988.4A CN201610238988A CN105738097A CN 105738097 A CN105738097 A CN 105738097A CN 201610238988 A CN201610238988 A CN 201610238988A CN 105738097 A CN105738097 A CN 105738097A
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- arm
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- detection
- combination jib
- jib
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a combination jib detection bench for an automobile crane and a detection method thereof. A rear hinge point support is used for fixing a combination jib, and a combination jib luffing dolly is used for supporting the combination jib and luffing adjustment. In order to reduce the resistance during telescoping operation of the combination jib, a supporting dolly is arranged to support the extending part of the combination jib. A length sensor and a laser theodolite are arranged on the combination jib detection bench, acquire extension amount of the combination jib and the flexibility and sidewise bending of the combination jib, and send the extension amount of the combination jib and the flexibility and sidewise bending of the combination jib to a detection controller. The detection controller determines whether the assembling error of the combination jib exceeds the limit according to the flexibility and sidewise bending of the combination jib under different telescoping states. The combination jib detection bench for an automobile crane and a detection method thereof strictly limit the assembling error of a combination jib assembly, improve the combination jib commissioning efficiency, and reduce the early-stage fault feedback rate of a combination jib telescoping system.
Description
Technical field
The present invention relates to a kind of autocrane combination arm monitor station and detection method thereof, belong to technical field of engineering machinery.
Background technology
Along with industrial construction, building industry etc. develop to high efficiency, extensive direction, autocrane loads as material and the important plant equipment of carrying is widely used among the every field of national economy.For the autocrane of telescopic hoist boom, combination arm is the critical component of car load, and the safety of its structure and the accuracy of assembling have a strong impact on the fault rate of machine product and the maintenance cost in later stage.At present, the assembling of domestic crane combination arm substantially still adopts the mode of manual assembly, relies on driving to pull or oil cylinder has advanced the assembling combining arm, be not carried out the automatization of assembling temporarily.
It addition, for the assembling quality of combination arm, current Means of Ensuring mainly has two kinds: a kind of experience being to rely in combination arm assembling process skilled worker.The subjective experience of this kind of method heavy dependence people, artificial intervention is many, control accuracy is poor, inefficiency, and does not combine the link of detection after arm is dressed up；Another kind of method is after car load assemble, carries out complete detection to combining the design of arm, function and assembling in car load is debugged, and the advantage of this kind of method is to can ensure that the verity of debugging enironment, and car load can dispatch from the factory after having debugged sale.But, once find arm fault or assembly problem, it is to avoid to dismantle arm, expend substantial amounts of manpower and materials, extend debugging cycle.Therefore, in order to ensure the production assembling quality of combination arm, avoid the debugging of later stage car load being pinpointed the problems and dismantling arm, improve work efficiency, the labor intensity of minimizing personnel, in the urgent need to researching and developing a kind of crane combination arm detection system meeting product demand and detection method, ensure the quality level after autocrane combination arm assembling.
Summary of the invention
The present invention provides a kind of autocrane combination arm monitor station and detection method thereof, it is possible to carry out functional check and rigging error test analysis to having assembled combination arm parts that are rear and that do not carry out final assembly.
A kind of autocrane combination arm monitor station, including: rear hinge support, combination suspension arm variable-amplitude dolly, amplitude oil cylinder, amplitude variation trolley running motor, linear transducer, laser transit and detection control apparatus；
Rear hinge support is fixed on ground, the size according to combination arm, selects suitable pin-and-hole to carry out clamping combination arm from rear hinge support；
Combination suspension arm variable-amplitude dolly is arranged on ground guide rail, for combining suspension arm support and the realization of luffing action；
Amplitude oil cylinder is arranged in suspension arm variable-amplitude dolly, for driving the luffing operation of combination arm；
Amplitude variation trolley running motor is arranged in suspension arm variable-amplitude dolly, for driving the walking of suspension arm variable-amplitude dolly, and then adjusts the position of suspension arm variable-amplitude dolly, improves the stressing conditions of combination arm；
Detection control apparatus electrically connects with described linear transducer and described laser transit respectively；
Linear transducer is arranged in the middle part of the basic arm of combination arm, gathers the elongation of combination arm and sends to detection control apparatus；
Laser transit is arranged on basic arm by magnetic stand, and the mark of described laser transit is being fixed on by magnetic base outside the arm cylinder of detected part, and sends the combination arm amount of deflection collected and side sway to detection control apparatus；
According to the combination arm amount of deflection when different retracted position and side sway, detection control apparatus judges whether the rigging error of combination arm transfinites.
Supporting trolley is arranged on ground guide rail, for holding up the extension of combination arm, to realize the adjustment of slide block between retraction and arm cylinder smoothly of arm；Support elevating ram and be arranged in supporting trolley, for adjusting the height of supporting trolley upper support seat, to support arm extension；Supporting trolley running motor is arranged in supporting trolley, for driving the walking of supporting trolley, thus adjusting the position of supporting trolley.
The detection method of a kind of autocrane combination arm monitor station, comprises the following steps:
The combination arm assembled is lifted on testboard, put on rear hinge point shaft, connect fluid pressure line and electric wiring, linear transducer is fixed in the installation site set on basic arm, use magnetic stand to be fixed on basic arm by laser transit, use magnetic stand to be fixed on outside the arm cylinder of detected part by the target of laser transit.
First the rigging error detection of arm is often saved.During the test of single-unit arm, except basic arm, successively combination arm is often saved arm from outside to inside and stretch out, linear transducer is used to measure the length that arm stretches out, use laser transit to measure amount of deflection and the side sway of combination arm simultaneously, checking whether its rigging error transfinites, if transfinited, revising accordingly；
Except detecting except single-unit arm, also should be combined arm and entirely stretch out detection.When combination arm stretches out detection entirely, first combination arm is stretched out entirely, laser transit is used to measure unloaded amount of deflection and the side sway of combination arm, it is judged that whether it transfinites, if do not transfinited, then terminate test, Product Assembly error meets the requirements, if amount of deflection or side sway transfinite when entirely stretching out test, then the slide block in reply combination arm and centralising device are adjusted correspondingly, to reduce rigging error, reach production requirement.
After combination arm stretches out detection entirely, in order to reduce combination arm retraction resistance so that it is can bounce back smoothly, be also provided with supporting cart jack, for combining the support of arm extension.
The invention has the beneficial effects as follows: the combination arm monitor station of the present invention, it is possible to carry out functional check and rigging error test analysis to having assembled combination arm parts that are rear and that do not carry out final assembly.The expanding-contracting action function of combination arm parts can be verified on monitor station, introduce linear transducer and laser transit can detect whether the rigging error combining arm parts transfinites, to find the initial failure of combination arm as early as possible, ensure the assembling quality of combination arm, hazard rate after reducing later stage machine debugging and coming into the market, improve work efficiency, reduce labor strength.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the operation principle schematic diagram of the present invention.
Wherein: 1, supporting trolley running motor；2, elevating ram is supported；3, supporting trolley；4, linear transducer；5, suspension arm variable-amplitude dolly；6, amplitude oil cylinder；7, laser transit；8, arm is combined in amplitude variation trolley running motor 9, combination；10, rear hinge support；11, fuel tank；12, overflow valve 1；13, luffing reversal valve；6, amplitude oil cylinder；14, flexible reversal valve；15, telescopic oil cylinder；4, linear transducer；7, laser transit；16, lifting reversal valve is supported；2, elevating ram is supported；1, running motor is supported；17, walking reversal valve is supported；8, luffing running motor；18, luffing walking reversal valve；19, overflow valve 2；20, oil filter；21, duplex pump unit；22, detection control apparatus.
Detailed description of the invention
In conjunction with accompanying drawing, the embodiment of the present invention is described in further detail:
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.Below in conjunction with figure and embodiment, technical scheme is carried out many-sided description.
Hereafter in order to describe conveniently, hereinafter alleged "left", "right", " on ", left and right, the upper and lower of D score and accompanying drawing itself is to consistent.
As it is shown in figure 1, autocrane combination arm monitor station hardware components is mainly made up of parts such as rear hinge support 10, combination suspension arm variable-amplitude dolly 5, supporting trolley 3, amplitude oil cylinder 6, support elevating ram 2, supporting trolley running motor 1, amplitude variation trolley running motor 8, linear transducer 4, laser transit 7 and detection control apparatus 22.
Rear hinge support 10 is for the rear hinge of fixed Combination arm, and it is fixed on ground, and for adapting to various sizes of combination arm, rear hinge support 10 is provided with the pin-and-hole of 5 differing heights and size；It is arranged on the combination suspension arm variable-amplitude dolly 5 on ground guide rail for the support of combination arm to be measured and luffing, in combination suspension arm variable-amplitude dolly 5, is provided with amplitude oil cylinder 6 and amplitude variation trolley running motor 8；Supporting trolley 3 is arranged on ground guide rail, for holding up the extension of combination arm, to realize the adjustment of slide block between retraction and arm cylinder smoothly of arm；Supporting trolley 3 is provided with support elevating ram 2, for adjusting the height of supporting trolley 3 upper support seat；Supporting trolley running motor 1 is similarly disposed in supporting trolley 3, is used for driving supporting trolley 3 along ground track travel, thus adjusting the position of supporting trolley 3；
Test process and the operation principle of autocrane combination arm monitor station are as follows:
The combination arm 9 assembled is lifted near monitor station, first according to the scale of combination arm 9 and size, rear hinge hole support 10 selects suitable pin-and-hole, and adopts bearing pin to connect combination arm 9 and rear hinge support 10；After after combination arm 9, hinge fixes, then it is considered as being stably placed on amplitude variation trolley 5 by combination arm 9, owing to its length of combination arm and the center of gravity of different size are inconsistent, therefore, before combination arm 9 is placed, the position of amplitude variation trolley 5 should be adjusted so that it is be in suitable loaded state.
The position adjustment of amplitude variation trolley 5 is as follows: if amplitude variation trolley 5 is in the right-hand member of monitor station in Fig. 1, when needing to adjust to the left, operation detection control apparatus 22, send instruction, make luffing walking reversal valve 18(see Fig. 2) it is in left end function position, under the effect of duplex pump unit 21, hydraulic oil is through filter 20, the little pump of duplex pump unit 21, luffing walking reversal valve 18, it is flowed into amplitude variation trolley running motor 8 so that it is rotate forward, thus driving amplitude variation trolley 5 to travel to the left along track；Otherwise, amplitude variation trolley 5 is in monitor station left end, when needing to move right, operation detection control apparatus 22 so that luffing walking reversal valve 18 is in right-hand member function position, under the effect of duplex pump unit 21, hydraulic oil is through filter 20, the little pump of duplex pump unit 21, luffing walking reversal valve 18, it is flowed into amplitude variation trolley running motor 8, makes motor reverse, thus driving amplitude variation trolley 5 along track to right travel；After amplitude variation trolley 5 reaches suitable position, make luffing walking reversal valve 18 mediate function position, then terminate the position adjustment of amplitude variation trolley 5.
After amplitude variation trolley 5 position adjustment is suitable, combination arm 9 is slowly fallen, is placed on the supporting seat of amplitude variation trolley 5, now also should adjust the height of the supporting seat of amplitude variation trolley 5, make combination arm 9 be in the state of level.It is as follows that it adjusts process: assumes that combination arm 9 is in left low right high state, now, operation detection control apparatus 22, luffing reversal valve 13 is made to be in left end function position, hydraulic oil in fuel tank 11, under the effect of duplex pump unit 21, through filter 20, the big pump of duplex pump unit 21 and luffing reversal valve 13, flows into the big chamber of amplitude oil cylinder 6, thus driving the supporting seat on amplitude variation trolley 5 to rise so that combination arm 9 tends to level；If combination arm 9 is in the state of right low left high, then should operate detection control 22, luffing reversal valve 13 is made to be in right-hand member function position, hydraulic oil in fuel tank 11 is under the effect of duplex pump unit 21, through filter 20, the big pump of duplex pump unit 21 and luffing reversal valve 13, flow into the loculus of amplitude oil cylinder 6, thus driving the supporting seat on amplitude variation trolley 5 to decline so that combination arm 9 tends to level；When after combination arm 9 adjustment level, operate luffing reversal valve 13 so that it is the function that mediates position, complete the horizontal adjustment of combination arm 9.
After combination arm 9 mounting and adjusting to be measured is good, linear transducer 4 is fixed on basic arm (the combination outermost arm cylinder of arm) in the installation site set；Use magnetic stand to be fixed on basic arm by laser transit 7, and the target magnetic stand of laser transit 7 is fixed on outside the arm cylinder of detected part；Adjust linear transducer 4 and the state of laser transit 7, and they and detection control apparatus 22 are electrically connected, be ready for the rigging error detection of combination arm 9.
First should carrying out the test of each joint arm, the purpose of this test is to check whether amount of deflection when the action of single-unit arm is whether normal and single-unit arm stretches out and error transfinite.For convenience of narration, save arm (adjacent with basic arm) test for one and illustrate.
The target magnetic stand of laser transit 7 is first fixed on outside a joint arm arm head, and is debugged by laser transit 7 before starting by test.Select the operation object of telescopic oil cylinder 15 so that it is act on a joint arm.Dependent instruction is sent by detection control apparatus 22, flexible reversal valve 14 is made to be in left end function position, hydraulic oil in fuel tank 11 is under the effect of duplex pump unit 21, through filter 20, the big pump of duplex pump unit 21 and flexible reversal valve 14, flow into the big chamber of telescopic oil cylinder 15, thus promoting a joint arm of combination arm 9 to stretch out.Treat that a joint arm reaches specific bit and postpones, cancel the dependent instruction of detection control apparatus 22, restore under flexible reversal valve 14 spring effect therein so that it is the function that self mediates position, thus what complete a joint arm stretches out operation.Adopt laser transit 7 to measure amount of deflection when combination arm 9 individually stretches out a joint arm and side sway, and test data are sent to detection control apparatus 22.The elongation of the combination arm 9 that detection control apparatus 22 detects according to linear transducer 4, selects corresponding rigging error threshold value；And the measured value of the amount of deflection collected by laser transit 7 and side sway compares with rigging error threshold value.If the test value that laser transit 7 collects is in allowed band, then it is assumed that the assembling of a joint arm meets production requirement；Otherwise, then it is assumed that the rigging error of a joint arm transfinites, it is necessary to a slide block saving arm and centralising device are adjusted accordingly, and again tests, until the rigging error of a joint arm meets the requirements.After a joint arm test terminates, instruction is sent by detection control apparatus 22, reversing valve operated 14, it is at right-hand member function position, now, hydraulic oil is under the effect of duplex pump unit 21, through filter 20, duplex pump unit 21, flexible reversal valve 14, flow into the loculus of telescopic oil cylinder 15, thus driving a joint arm of combination arm 9 to retract.
For all the other joint arms of combination arm 9, its operation is similar with method of testing.Only before test every time, the target magnetic stand of laser transit 7 is fixed on outside the arm head of joint arm to be measured, and has debugged the test mode of laser transit 7.
Combination arm 9 respectively saves after arm all completes dependence test, also should be combined arm 9 and entirely stretch state-detection.Under this measurement condition, operation detection control apparatus 22, flexible reversal valve 14 is made to be in left end function position, hydraulic oil in fuel tank 11 is under the effect of duplex pump unit 21, through filter 20, the big pump of duplex pump unit 21 and flexible reversal valve 14, flow into the big chamber of telescopic oil cylinder 15, thus promoting combination arm 9 to stretch out.After arm 9 to be combined is fully extended so that flexible reversal valve 14 mediates function position.Now, adopt laser transit 7 to measure amount of deflection and the side sway of combination arm 9, and test data are sent to detection control apparatus 22.The amount of deflection collected and side sway are compared by detection control apparatus 22 with corresponding rigging error threshold value.If amount of deflection when combination arm 9 stretches out entirely and side sway are in allowed limits, then it is assumed that rigging error when tested combination arm 9 stretches out entirely meets the requirements；Otherwise, reply combination arm 9 carries out checking and adjust its internal slide block and centralising device, and again tests, until rigging error when combination arm 9 stretches out entirely is in allowed band.
Combination arm 9 stretches out after test terminates entirely, also should the often joint arm of combination arm 9 retract, to recover to combine the original appearance of arm 9.Now, in order to reduce resistance when combination arm 9 bounces back, should adopt supporting trolley 3 that the extension of combination arm 9 is supported.Before supporting operation, first should adjust the supporting trolley 3 position on ground track, to ensure that combination arm 9 is in suitable stress situation when supporting operation.Assume that supporting trolley 3 need to be moved to the left, then operation detection control apparatus 22, it is made to send instruction, support walking reversal valve 17 is made to be in left end function position, hydraulic oil, under the effect of duplex pump unit 21, through filter 20, the little pump of duplex pump unit 21 and support walking reversal valve 17, flows into supporting trolley running motor 1, driving motor rotates forward, thus promoting supporting trolley 3 to be moved to the left；If supporting trolley 3 need to by moving right, then being sent instruction by detection control apparatus 22 so that support walking reversal valve 17 and be in right-hand member function position, drive supporting trolley running motor 1 to reverse, and then promote supporting trolley 3 to move right.After supporting trolley 3 reaches correct position, also should adjust its height, to reach suitable support effect.Assume the bearing height needing to promote supporting trolley 3, then should operate detection control apparatus 22, instruction is sent to supporting lifting reversal valve 16, make to support lifting reversal valve 16 and be in left end function position, now, hydraulic oil, under the effect of duplex pump unit 21, enters the big chamber supporting elevating ram 2, promotes the supporting seat at supporting trolley 3 top to rise；If needing to reduce the bearing height of supporting trolley 3, then should making to support lifting reversal valve 16 and be in right-hand member function position, now, hydraulic oil, under the effect of duplex pump unit 21, enters the loculus supporting elevating ram 2, promotes supporting trolley 3 to reduce bearing height.
Additionally, system is additionally provided with overflow valve 12 and overflow valve 19, it is respectively used to the big pump hydraulic circuit of duplex pump unit 21 and the safeguard protection of little pump hydraulic circuit.
Claims (3)
1. an autocrane combination arm monitor station, it is characterized in that, including: rear hinge support, combination suspension arm variable-amplitude dolly, amplitude oil cylinder, amplitude variation trolley running motor, linear transducer, laser transit and detection control apparatus, rear hinge support is fixed on ground, selects suitable pin-and-hole to carry out clamping combination arm from rear hinge support；Combination suspension arm variable-amplitude dolly is arranged on ground guide rail；Amplitude oil cylinder and amplitude variation trolley running motor are arranged in suspension arm variable-amplitude dolly；Detection control apparatus electrically connects with linear transducer and laser transit respectively；Linear transducer is arranged in the middle part of the basic arm of combination arm, and linear transducer arranges the elongation gathering combination arm and sends to detection control apparatus；Laser transit is arranged on basic arm by magnetic stand, and the mark of laser transit is being fixed on by magnetic base outside the arm cylinder of detected part, and sends the combination arm amount of deflection collected and side sway to detection control apparatus.
2. a kind of autocrane combination arm monitor station according to claim 1, it is characterised in that also including a supporting trolley, supporting trolley is arranged on ground guide rail, supports elevating ram and supporting trolley running motor is arranged in supporting trolley.
3. the detection method of an autocrane combination arm monitor station, it is characterised in that comprise the following steps:
The combination arm assembled is lifted on testboard, put on rear hinge point shaft, connect fluid pressure line and electric wiring, linear transducer is fixed in the installation site set on basic arm, use magnetic stand to be fixed on basic arm by laser transit, use magnetic stand to be fixed on outside the arm cylinder of detected part by the target of laser transit；
First the rigging error detection of arm is often saved, during the test of single-unit arm, except basic arm, successively combination arm is often saved arm from outside to inside to stretch out, linear transducer is used to measure the length that arm stretches out, use laser transit to measure amount of deflection and the side sway of combination arm simultaneously, checking whether its rigging error transfinites, if transfinited, revising accordingly；
After the detection of single-unit arm, it is combined arm and entirely stretches out detection, when combination arm stretches out detection entirely, first combination arm is stretched out entirely, laser transit is used to measure unloaded amount of deflection and the side sway of combination arm, it is judged that whether it transfinites, if do not transfinited, then terminate test, Product Assembly error meets the requirements, if amount of deflection or side sway transfinite when entirely stretching out test, then the slide block in reply combination arm and centralising device are adjusted correspondingly, to reduce rigging error, reach production requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610238988.4A CN105738097A (en) | 2016-04-18 | 2016-04-18 | Combination jib detection bench for automobile crane and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610238988.4A CN105738097A (en) | 2016-04-18 | 2016-04-18 | Combination jib detection bench for automobile crane and detection method thereof |
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| CN105738097A true CN105738097A (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610238988.4A Pending CN105738097A (en) | 2016-04-18 | 2016-04-18 | Combination jib detection bench for automobile crane and detection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110682090A (en) * | 2019-09-24 | 2020-01-14 | 长沙中联消防机械有限公司 | Telescopic arm assembling system and assembling method |
| CN115420244A (en) * | 2022-08-31 | 2022-12-02 | 南京航空航天大学 | A mark target frock for three-dimensional laser survey of whole oil tank of aircraft |
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| CN203529801U (en) * | 2013-09-27 | 2014-04-09 | 徐州重型机械有限公司 | Device for testing jib of travelling crane |
| CN203908516U (en) * | 2013-08-27 | 2014-10-29 | 徐州重型机械有限公司 | Crane suspension arm linearity automatic detection device |
| CN205719506U (en) * | 2016-04-18 | 2016-11-23 | 江苏师范大学 | A kind of autocrane combination arm monitor station |
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| CN2802493Y (en) * | 2005-05-27 | 2006-08-02 | 徐州重型机械有限公司 | Universal tester for hanging arm of vehicle hoister |
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| CN203908516U (en) * | 2013-08-27 | 2014-10-29 | 徐州重型机械有限公司 | Crane suspension arm linearity automatic detection device |
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| CN205719506U (en) * | 2016-04-18 | 2016-11-23 | 江苏师范大学 | A kind of autocrane combination arm monitor station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110682090A (en) * | 2019-09-24 | 2020-01-14 | 长沙中联消防机械有限公司 | Telescopic arm assembling system and assembling method |
| CN115420244A (en) * | 2022-08-31 | 2022-12-02 | 南京航空航天大学 | A mark target frock for three-dimensional laser survey of whole oil tank of aircraft |
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