CN102183426B - Novel method for testing durability of track tensioning device of hydraulic excavator - Google Patents
Novel method for testing durability of track tensioning device of hydraulic excavator Download PDFInfo
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- CN102183426B CN102183426B CN2011100686402A CN201110068640A CN102183426B CN 102183426 B CN102183426 B CN 102183426B CN 2011100686402 A CN2011100686402 A CN 2011100686402A CN 201110068640 A CN201110068640 A CN 201110068640A CN 102183426 B CN102183426 B CN 102183426B
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- track tensioning
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Abstract
The invention discloses a novel method for testing the durability of a track tensioning device of a hydraulic excavator. The method comprises the following steps of: calculating a maximum working pressure of an oil cylinder during working according to a maximum load of the track tensioning device of the hydraulic excavator and the diameter of the oil cylinder, taking the maximum working pressure as a maximum hydraulic value provided by a hydraulic pump unit, and connecting the track tensioning device and the hydraulic pump unit with an operating system through an oil supply pipeline; removing grease inside the oil cylinder of the track tensioning device, and realizing periodic compression of a tensioning spring by using periodic reciprocating motions of a piston and the oil cylinder of the track tensioning device; recording a spring compressed frequency before the track tensioning device fails so as to determine the durability of the track tensioning device; and detecting and analyzing a failure mode so as to provide basis for improvement on the durability of the track tensioning device. By using the oil cylinder of the track tensioning device, the reciprocating motion of the tensioning spring is realized, and an auxiliary hydraulic cylinder is avoided; therefore, the whole test equipment is simplified, and the safety protection level is high.
Description
Technical field
The present invention relates to a kind of method of testing of track takeup, relate in particular to a kind of novel hydraulic excavator track takeup durability test method.
Background technology
As a rule; In hydraulic excavator wearing and tearing owing to rail chain pin sleeve after use a period of time; Can cause pitch to increase, be easy to cause the crawler belt derailing and the friction track frame, thereby influence the walking performance of excavator; Therefore must in crawler unit, install tensioning system, make crawler belt keep certain rate of tension.Track takeup is an important component part of crawler type walking mechanism, and its performance quality has very big influence to the rideability of track vehicle.Crawler hypraulic excavator is through the abominable sitework of the environmental baseline of being everlasting; Therefore require track takeup to have following performance: crawler belt receives external force or tractive force to make time spent pretension tension force can realize balance adjustment; Make when advancing not because of receiving external force lax slightly; And make when falling back and to produce enough tractive force, thereby keep track pin and the normal engaged that drives the gear teeth.
At present; Mostly widely used track takeup is to have the spring tensioning system of auxiliary hydraulic cylinder in hydraulic excavator; This tensioning system utilizes spring that track tensioning force is provided; Play the effect of buffering in the process of walking, utilize piston-oil cylinder filling butter to adapt to the length of crawler belt variation and guarantee that spring provides suitable tensile force simultaneously.Track takeup can receive the influence that changes complicated loading in the excavator walking process; Thereby cause oil cylinder inside constantly to bear the pressure of 20～40MPa (is example with 20 tons of excavators); Therefore; Need be to carrying out durability test in the tensioning system some cycles in process of production that newly manufactures and designs, with checking tensioning spring and the fatigue durability of other parts and each item indexs such as permanent sealing property of seal.The endurancing of finding excavator tensioning system all is to utilize hydraulic power unit the tensioning system spring to be applied the load of an alternation through an external hydraulic jack cycle at present; Promptly periodically compress tensioning spring so that it is carried out the test of permanance; This endurancing comes down to test to the fatigue resistence of spring and in the permanance that piston and oil cylinder are under the constant voltage, can't reflect piston and the oil cylinder endurance quality when relative motion.
Summary of the invention
Problem to above-mentioned existence; The purpose of this invention is to provide a kind of novel hydraulic excavator track takeup durability test method; On the basis of removing the inner butter of tensioning system oil cylinder; Utilize tensioning system self oil cylinder and periodically charge and discharge oil and realize oil cylinder to-and-fro movement and compression spring, reach the purpose of test tensioning system permanance, also can reflect piston and the oil cylinder endurance quality when relative motion simultaneously through hydraulic power unit.
The objective of the invention is to realize through following technical proposals:
A kind of novel hydraulic excavator track takeup durability test method wherein, comprising:
MWP when (1) calculating oil cylinder work based on the maximum load of the track tensioning device of hydraulic excavator that is used to test and cylinder diameter; With this maximum hydraulic pressure value that can provide, said track takeup is connected with the said hydraulic power unit that has control system through oil supply line as hydraulic power unit;
(2) remove the inner butter of said track takeup oil cylinder, utilize the periodicity to-and-fro movement of said track takeup self piston and oil cylinder to realize periodic compression tensioning spring;
(3) the length of spring compressed number of times before the said track takeup of record lost efficacy is weighed the endurance quality of said track takeup with this;
(4) detect and analyze failure mode, the foundation of recommendation on improvement is provided as the endurance quality of giving said track takeup with this.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the output pressure 70MPa of said hydraulic power unit.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the tonnage of said hydraulic excavator is 5.5 tons-70 tons.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, said hydraulic power unit is exported MWP in one-period time is 2.3s-25s.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the said one-period time is 8s-45s.
Compared with present technology, beneficial effect of the present invention is:
(1) utilizes track takeup self oil cylinder to realize the to-and-fro movement of tensioning spring, saved auxiliary hydraulic cylinder, simplified a whole set of testing equipment;
The protection of automatic deloading level when (2) possessing above predetermined pressure and travel limits, and unexpected inefficacy, pressure limit, stroke transfinites and the sound and light alarm during other operation troubless, the security protection rank is high;
(3) can not only realize test, also can realize the test of wearing quality between unit under test piston and oil cylinder simultaneously the track takeup permanance, and the durability test of the seal under cyclical movement state between unit under test piston and oil cylinder.
Description of drawings
Fig. 1 is that the testing equipment of novel hydraulic excavator track takeup durability test method of the present invention connects synoptic diagram;
Fig. 2 is the force value variation diagram in the hydraulic power unit course of work used of novel hydraulic excavator track takeup durability test method of the present invention.
Embodiment
Below in conjunction with schematic diagram and concrete operations embodiment the present invention is described further.
The present invention is a kind of novel hydraulic excavator track takeup durability test method; Fig. 1 is that testing equipment of the present invention connects synoptic diagram; In the present embodiment; Subjects is to use tensioning system by 5.5 tons of-70 tons of hydraulic excavators that the design of 31 Juki Corporation is produced, and testing program and equipment should be able to cover this interval interior all over products.With reference to shown in Figure 1; The track takeup 1 of participating in test is placed on the test rack 2; Test rack 2 can be suitable with the tested track tensioning device of hydraulic excavator 1 of above-mentioned various models, and tested track takeup 1 is connected with the hydraulic power unit 5 that has operation and control system 4 through oil supply line 3.The outlet line of tested track takeup 1 can tolerate above-mentioned pressure and have the general-purpose interface that is mated by tested parts with various models.Hydraulic power unit 5 must provide has the required hydraulic power of tensioning spring maximum compression that can satisfy tested tensioning system 1; MWP when the oil cylinder that specifically can calculate based on the maximum load and the cylinder diameter of the track tensioning device of hydraulic excavator that is used to test 1 is worked is confirmed; With this maximum hydraulic pressure value that can provide as hydraulic power unit 5; Further, the output pressure of hydraulic power unit 5 can be 70MPa.Remove the inner butter of track takeup 1 oil cylinder; Utilize the periodicity to-and-fro movement of track takeup 1 self piston and oil cylinder to realize periodic compression to tensioning spring; Force value in hydraulic power unit 5 courses of work changes referring to shown in Figure 2 during this time; Hydraulic power unit 5 is exported MWP in one-period time is 2.3s-25s, and the one-period time T is 8s-45s.Note the length of spring compressed number of times before track takeup 1 lost efficacy, weigh the endurance quality of track takeup 1, detect and analyze failure mode at last, the foundation of recommendation on improvement is provided as the endurance quality of giving track takeup 1 with this with this.
During operation, concrete steps are following: power light is bright simultaneously for a, toggle switch energized; B, rotate counterclockwise pressure adjustment handle to the limit (purpose: make the pressure of surplus valve setting minimum, oil pump is under low pressure started); C, test specimen is installed on main frame; D, installation adjustment limit switch; E, connection oil pipe are communicated with pumping plant and test specimen oil circuit; F, definite test specimen correctly install be connected with oil pipe correct after; G, pay special attention to limit switch to correctly install the adjustment position (will guarantee that oil cylinder can touch limit switch when extreme position); H, on screen, set MWP and safe pressure; I, the dwell time when on screen, being set in MWP; J, the dead time after setting the oil cylinder off-load on the screen; K, open moving oil pump and observe the pressure indication on the tensimeter by oil pump; L, toggle switch to stress state make the pressure display on the oil-filled while view screen of oil cylinder; M, adjust pressure adjustment handle clockwise and oil cylinder is pressurizeed (whether the installment state of in this process, noting observing test specimen is normal until reaching MWP; Oil pipe connects whether normally have or not oil leakage phenomenon; Whether install correct) if observing limit switch; Like the following step of the normal continuation of each item, if any carrying out the operation of q item unusually; O, toggle switch are to halted state; P, start normal test routine through screen operator and make an experiment; Q,, unusual and off-test carry out following operation when appearring in m item operation: close by oil pump and make that oil pump stops, toggle switch to unloaded state, be rotated counterclockwise pressure regulating handle and make power supply stop to cut off the electricity supply, when emergency occurs, cutting off the electricity supply by scram button to the limit, toggle switch.The protection of automatic deloading level when correlation test equipment of the present invention possesses above predetermined pressure and travel limits, and unexpected inefficacy, pressure limit, stroke transfinites and the sound and light of alarm during other operation troubless.In addition, in the test that realizes the track takeup permanance, also can realize the test of wearing quality between unit under test piston and oil cylinder, and the durability test of the seal under cyclical movement state between unit under test piston and oil cylinder.
In sum, novel hydraulic excavator track takeup durability test method of the present invention utilizes track takeup self oil cylinder to realize the to-and-fro movement of tensioning spring, has saved auxiliary hydraulic cylinder, has simplified a whole set of testing equipment, and the security protection rank is high.
More than specific embodiment of the present invention is described in detail, but novel hydraulic excavator track takeup durability test method of the present invention is not restricted to the specific embodiment of above description, it is just as example.To those skilled in the art, any to this equivalent modifications of carrying out and alternative also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of having done under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (5)
1. a track tensioning device of hydraulic excavator durability test method is characterized in that, comprising:
MWP when (1) calculating oil cylinder work based on the maximum load of the track tensioning device of hydraulic excavator that is used to test and cylinder diameter; With this maximum hydraulic pressure value that can provide, said track takeup is connected with the said hydraulic power unit that has control system through oil supply line as hydraulic power unit;
(2) remove the inner butter of said track takeup oil cylinder, utilize the periodicity to-and-fro movement of said track takeup self piston and oil cylinder to realize periodic compression tensioning spring;
(3) the length of spring compressed number of times before the said track takeup of record lost efficacy is weighed the endurance quality of said track takeup with this;
(4) detect and analyze failure mode, the foundation of recommendation on improvement is provided as the endurance quality of giving said track takeup with this.
2. track tensioning device of hydraulic excavator durability test method according to claim 1 is characterized in that, the output pressure 70MPa of said hydraulic power unit.
3. track tensioning device of hydraulic excavator durability test method according to claim 1 is characterized in that, the tonnage of said hydraulic excavator is 5.5 tons-70 tons.
4. track tensioning device of hydraulic excavator durability test method according to claim 1 is characterized in that, said hydraulic power unit is exported MWP in one-period time is 2.3s-25s.
5. track tensioning device of hydraulic excavator durability test method according to claim 4 is characterized in that, the said one-period time is 8s-45s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100686402A CN102183426B (en) | 2011-03-22 | 2011-03-22 | Novel method for testing durability of track tensioning device of hydraulic excavator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100686402A CN102183426B (en) | 2011-03-22 | 2011-03-22 | Novel method for testing durability of track tensioning device of hydraulic excavator |
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| CN102183426A CN102183426A (en) | 2011-09-14 |
| CN102183426B true CN102183426B (en) | 2012-11-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108444692A (en) * | 2018-06-08 | 2018-08-24 | 江阴市长龄机械制造有限公司 | The fatigue experimental device of guide wheel strainer |
| CN109000907B (en) * | 2018-06-08 | 2020-03-20 | 江苏长龄液压股份有限公司 | Fatigue test method for guide wheel tensioning mechanism |
| CN110131241A (en) * | 2019-06-11 | 2019-08-16 | 兖州煤业股份有限公司 | Development machine crawler tensioning plunger cylinder total travel pressure test device and its method |
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| CN201472505U (en) * | 2009-08-03 | 2010-05-19 | 江阴市长龄液压机具厂 | Crawler tension device |
| CN101767612A (en) * | 2010-01-29 | 2010-07-07 | 太原重工股份有限公司 | Large mineral track tensioning device of hydraulic excavator |
| CN101806076A (en) * | 2010-04-09 | 2010-08-18 | 太原重工股份有限公司 | Crawler tensioning hydraulic control system of hydraulic excavator |
| CN201703449U (en) * | 2010-05-17 | 2011-01-12 | 江阴市长龄机械制造有限公司 | Track tensioning device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4121105B2 (en) * | 1999-09-27 | 2008-07-23 | 株式会社小松製作所 | Mount structure of idler wheel device for crawler type work vehicle |
| US7229140B2 (en) * | 2004-04-01 | 2007-06-12 | Clark Equipment Company | Pre-tensioned spring track tensioning system |
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Patent Citations (4)
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|---|---|---|---|---|
| CN201472505U (en) * | 2009-08-03 | 2010-05-19 | 江阴市长龄液压机具厂 | Crawler tension device |
| CN101767612A (en) * | 2010-01-29 | 2010-07-07 | 太原重工股份有限公司 | Large mineral track tensioning device of hydraulic excavator |
| CN101806076A (en) * | 2010-04-09 | 2010-08-18 | 太原重工股份有限公司 | Crawler tensioning hydraulic control system of hydraulic excavator |
| CN201703449U (en) * | 2010-05-17 | 2011-01-12 | 江阴市长龄机械制造有限公司 | Track tensioning device |
Non-Patent Citations (2)
| Title |
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| JP特开2001-88754A 2001.04.03 |
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