CN102183426A - 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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- CN102183426A CN102183426A CN 201110068640 CN201110068640A CN102183426A CN 102183426 A CN102183426 A CN 102183426A CN 201110068640 CN201110068640 CN 201110068640 CN 201110068640 A CN201110068640 A CN 201110068640A CN 102183426 A CN102183426 A CN 102183426A
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- tensioning device
- track takeup
- oil cylinder
- hydraulic excavator
- track
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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 a significant impact 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 is subjected to external force or tractive force to make time spent pretension tension force can realize balance adjustment, make when advancing not because of being subjected to external force lax slightly, and make when falling back and to produce enough tractive force, thereby keep track pin and drive the normal engaged of 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 be subjected to changing the influence of complicated loading in the excavator walking process, thereby causing oil cylinder inside constantly to bear 20～40MPa(is example with 20 tons of excavators) pressure, 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 every 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 by 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 at 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 by hydraulic power unit, reach the purpose of test tensioning system permanance, also can reflect piston and the oil cylinder endurance quality when relative motion simultaneously.
The objective of the invention is to be achieved through the following technical solutions:
A kind of novel hydraulic excavator track takeup durability test method wherein, comprising:
Maximum working pressure (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, described track takeup is connected with the described hydraulic power unit that has control system by oil supply line as hydraulic power unit;
(2) remove the inner butter of described track takeup oil cylinder, utilize the periodic compression of the periodicity to-and-fro movement realization of described track takeup self piston and oil cylinder tensioning spring;
(3) the length of spring compressed number of times before the described track takeup of record lost efficacy is weighed the endurance quality of described track takeup with this;
(4) detect and analyze failure mode, provide the foundation of recommendation on improvement as the endurance quality of giving described track takeup with this.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the output pressure 70MPa of described hydraulic power unit.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the tonnage of described hydraulic excavator is 5.5 tons-70 tons.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, described hydraulic power unit is exported maximum working pressure (MWP) in one-period time is 2.3s-25s.
Above-mentioned novel hydraulic excavator track takeup durability test method, wherein, the described one-period time is 8s-45s.
Compared with the prior art, 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, security protection rank height;
(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 the testing equipment connection diagram of novel hydraulic excavator track takeup durability test method of the present invention;
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
The invention will be further described below in conjunction with schematic diagram and concrete operations embodiment.
The present invention is a kind of novel hydraulic excavator track takeup durability test method, Fig. 1 is a testing equipment connection diagram of the present invention, in the present embodiment, subjects is 5.5 tons of-70 tons of hydraulic excavator tensioning system being produced by the design of 31 Juki Corporation, 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 that participates 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 by oil supply line 3.The outlet line of tested track takeup 1 can tolerate above-mentioned pressure and have the general-purpose interface of being tested part match 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, maximum working pressure (MWP) in the time of specifically can be based on the maximum load of the track tensioning device of hydraulic excavator 1 that is used to test and oil cylinder work that cylinder diameter calculates is determined, 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 butter of track takeup 1 oil cylinder inside, 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 maximum working pressure (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, provide the foundation of recommendation on improvement as the endurance quality of giving track takeup 1 with this with this.
During operation, concrete steps are as follows: power light is bright simultaneously for a, toggle switch energized; B, rotate counterclockwise pressure and adjust 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; Limit switch is adjusted in d, installation; 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 and will correctly install and adjust position (will guarantee that oil cylinder can touch limit switch when extreme position); H, on screen, set maximum working pressure (MWP) and safe pressure; I, the dwell time when on screen, being set in maximum working pressure (MWP); J, the dead time after setting the oil cylinder off-load on the screen; K, open moving oil pump and observe pressure indication on the tensimeter by oil pump; L, toggle switch to stress state show the pressure on the oil-filled while view screen of oil cylinder; M, adjust pressure clockwise and adjust handle and oil cylinder is pressurizeed (whether the installment state of noting observing test specimen in this process is normal until reaching maximum working pressure (MWP), oil pipe connects whether normally have or not oil leakage phenomenon, whether install correct) if observing limit switch, as step below every normal continuation, if any carrying out the operation of q item unusually; O, toggle switch are to halted state; P, start normal test routine by screen operator and test; Q, when unusual and off-test appear in m item operation, carry out following 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, security protection rank height.
More than specific embodiments of the invention are described in detail, but novel hydraulic excavator track takeup durability test method of the present invention is not restricted to specific embodiment described above, 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 novel hydraulic excavator track takeup durability test method is characterized in that, comprising:
Maximum working pressure (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, described track takeup is connected with the described hydraulic power unit that has control system by oil supply line as hydraulic power unit;
(2) remove the inner butter of described track takeup oil cylinder, utilize the periodic compression of the periodicity to-and-fro movement realization of described track takeup self piston and oil cylinder tensioning spring;
(3) the length of spring compressed number of times before the described track takeup of record lost efficacy is weighed the endurance quality of described track takeup with this;
(4) detect and analyze failure mode, provide the foundation of recommendation on improvement as the endurance quality of giving described track takeup with this.
2. novel hydraulic excavator track takeup durability test method according to claim 1 is characterized in that the output pressure 70MPa of described hydraulic power unit.
3. novel hydraulic excavator track takeup durability test method according to claim 1 is characterized in that, the tonnage of described hydraulic excavator is 5.5 tons-70 tons.
4. novel hydraulic excavator track takeup durability test method according to claim 1 is characterized in that described hydraulic power unit is exported maximum working pressure (MWP) in one-period time is 2.3s-25s.
5. novel hydraulic excavator track takeup durability test method according to claim 4 is characterized in that the described one-period time is 8s-45s.
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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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| 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 true CN102183426A (en) | 2011-09-14 |
| CN102183426B CN102183426B (en) | 2012-11-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109000907A (en) * | 2018-06-08 | 2018-12-14 | 江苏长龄液压股份有限公司 | The fatigue test method of guide wheel strainer |
| 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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2011
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109000907A (en) * | 2018-06-08 | 2018-12-14 | 江苏长龄液压股份有限公司 | The fatigue test method 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 |
| CN108444692B (en) * | 2018-06-08 | 2024-05-24 | 江苏长龄液压股份有限公司 | Fatigue test device of 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 |
| CN110131241B (en) * | 2019-06-11 | 2024-05-31 | 兖矿能源集团股份有限公司 | Full-stroke pressurization test device and method for track tensioning plunger cylinder of heading machine |
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| CN102183426B (en) | 2012-11-07 |
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