CN102966131A - Method for analyzing energy loss of hydraulic system of loader under different work conditions - Google Patents
Method for analyzing energy loss of hydraulic system of loader under different work conditions Download PDFInfo
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- CN102966131A CN102966131A CN2012104630913A CN201210463091A CN102966131A CN 102966131 A CN102966131 A CN 102966131A CN 2012104630913 A CN2012104630913 A CN 2012104630913A CN 201210463091 A CN201210463091 A CN 201210463091A CN 102966131 A CN102966131 A CN 102966131A
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- scraper bowl
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- bucket
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Abstract
The invention discloses a method for analyzing energy loss of a hydraulic system of a loader under different work conditions. The method comprises the following steps of: when a scraper bucket is inserted into a material pile, calculating a counterforce of the material pile to the scraper bucket; when the scraper bucket is inserted into the material pile for a certain depth and a movable arm is elevated, calculating the counterforce of the material pile to the scraper bucket; obtaining a maximum digging resistance by calculating a maximum resistance torque of a rotating bucket when the scraper bucket scrapes; calculating power loss conditions including a discharging work condition, a work condition of retracting the bucket to be horizontal and a movable arm descending work condition; and preventing the overflow by enabling the hydraulic system of the work device to be in a no-load state. The method disclosed by the invention has the benefits beneficial effects that outer loads, such as inserting resistance, digging resistance and material gravity borne by the work device and the gravity influence of the work device of the loader are facilitated to be calculated, the hydraulic system can quickly enter a normal work state; the integral work efficiency of the equipment is increased; and electric energy is saved.
Description
Technical field
The present invention relates to the hydraulic technique field, relate in particular to the Energy Loss Analysis method of a kind of loader hydraulic system under different operating modes.
Background technology
Hydraulic system is ingredient important in the loader, and the upset of the swing arm lifting of loader, scraper bowl and complete machine such as turn to all to need to drive to finish by hydraulic system at the elemental motion.The too high problem of oil temperature often appears in loader in use hydraulic system, show according to factual survey, during loader work oil temperature in hydraulic system higher be one of principal element of affecting hydraulic system and reliability of hydraulic component and complete machine operating efficiency.Therefore, guaranteeing that the thermal equilibrium temperature of loader hydraulic system is in normal condition, is to guarantee the loader reliably working, improves the key of hydraulic system efficient; Cause that the too high factor of oil temperature in hydraulic system mainly contains: the pressure loss of the volumetric loss of hydraulic pump and hydraulic cylinder, valve element and pipeline parts, the mechanical friction loss of each class component etc.These losses finally form power losses and generate heat, the heat that produces is dispersed into the space by radiator and each Hydraulic Elements, pipeline, tank surface except a part, load variations was larger when all the other major parts can cause the work of hydraulic oil temperature rising loader, and machining device hydraulic system is driven by constant displacement pump.Therefore, spill losses, meta off-load loss and the restriction loss of hydraulic system of loading machine working device under different operating modes is the one of the main reasons that causes that oil temperature is too high; For reducing spill losses, meta off-load loss and the restriction loss of hydraulic system of loading machine working device under different operating modes, the utilization rate that improves hydraulic system has great importance.Loader is to use very widely a kind of engineering machinery, its groundwork device is swing arm and scraper bowl, elemental motion comprises: scraper bowl is inserted then reversible bucket of material, improving material is to certain altitude, when keeping load, material transportation is arrived the appointed place, dump, return at last charging place, so cycle operation.But a lot of loaders are in finishing a standard operation cyclic process, the suffered external applied load of its equipment mainly contains the gravity that inserts resistance, turn up resistance, material gravity and working device of loader self can be subjected in various degree impact, and these can cause systematic error.
Summary of the invention
The purpose of this invention is to provide a kind of Energy Loss Analysis method of loader hydraulic system under different operating modes that can guarantee safe execution, saves energy, can reduce equipment cost, to solve many deficiencies of prior art.
Purpose of the present invention is come specific implementation by the following technical programs:
The Energy Loss Analysis method of a kind of loader hydraulic system under different operating modes mainly is comprised of following steps:
⑴ when insert stockpile when scraper bowl, calculate stockpile to the reaction force of scraper bowl, the resistance of cutting edge and both sides headwall cutting edge before main frictional resistance by scraper bowl bottom and side wall inner surfaces and material, the scraper bowl;
⑵ when promoting swing arm, calculate stockpile to the reaction force of scraper bowl after scraper bowl inserts the stockpile certain depth; Frictional resistance and the frictional resistance between material and scraper bowl between kind, density, lumpiness, material and the material of turn up resistance and material are relevant, and the maximum rotating bucket moment of resistance when maximum turn up resistance can be got by the scraper bowl shovel calculates;
⑶ the gravity of material exists when scraper bowl just inserts material, until the gravity vanishing of material during complete unloading, the gravity of material increases along with the increase of scraper bowl insertion depth, and reaches maximum value in the moment that begins to receive bucket;
⑷ rated output damaed cordition comprises the discharging operating mode, receives bucket to horizontal operating mode, decline swing arm operating mode, and machining device hydraulic system is in Light Condition, can not produce overflow;
Insert operating mode: scraper bowl hydraulic cylinder and the locking of swing arm hydraulic cylinder, machining device hydraulic system is in unloading condition;
Receive the bucket operating mode: the scraper bowl hydraulic cylinder stretches out, and the multiple directional control valve of control scraper bowl hydraulic cylinder utilizes Throttle Principle to control the movement velocity of scraper bowl hydraulic cylinder;
Swing arm promotes operating mode: the swing arm hydraulic cylinder piston stretches out, and the multiple directional control valve of control swing arm hydraulic cylinder utilizes Throttle Principle to control the movement velocity of swing arm hydraulic cylinder piston.
The beneficial effect of the Energy Loss Analysis method of loader hydraulic system of the present invention under different operating modes is: be conducive to the suffered external applied load of evaluation work device and mainly contain the gravity effect that inserts resistance, turn up resistance, material gravity and working device of loader self, can enter very soon normal operating conditions, improve the operating efficiency of Whole Equipment, saved electric energy.
The specific embodiment
The Energy Loss Analysis method of the described loader hydraulic system of the embodiment of the invention under different operating modes, its key step comprises:
⑴ when insert stockpile when scraper bowl, calculate stockpile to the reaction force of scraper bowl, the resistance of cutting edge and both sides headwall cutting edge before main frictional resistance by scraper bowl bottom and side wall inner surfaces and material, the scraper bowl;
⑵ when promoting swing arm, calculate stockpile to the reaction force of scraper bowl after scraper bowl inserts the stockpile certain depth; Frictional resistance and the frictional resistance between material and scraper bowl between kind, density, lumpiness, material and the material of turn up resistance and material are relevant, and the maximum rotating bucket moment of resistance when maximum turn up resistance can be got by the scraper bowl shovel calculates;
⑶ the gravity of material exists when scraper bowl just inserts material, until the gravity vanishing of material during complete unloading, the gravity of material increases along with the increase of scraper bowl insertion depth, and reaches maximum value in the moment that begins to receive bucket;
⑷ rated output damaed cordition comprises the discharging operating mode, receives bucket to horizontal operating mode, decline swing arm operating mode, and machining device hydraulic system is in Light Condition, can not produce overflow;
Insert operating mode: scraper bowl hydraulic cylinder and the locking of swing arm hydraulic cylinder, machining device hydraulic system is in unloading condition;
Receive the bucket operating mode: the scraper bowl hydraulic cylinder stretches out, and the multiple directional control valve of control scraper bowl hydraulic cylinder utilizes Throttle Principle to control the movement velocity of scraper bowl hydraulic cylinder;
Swing arm promotes operating mode: the swing arm hydraulic cylinder piston stretches out, and the multiple directional control valve of control swing arm hydraulic cylinder utilizes Throttle Principle to control the movement velocity of swing arm hydraulic cylinder piston.
Claims (1)
1. the Energy Loss Analysis method of a loader hydraulic system under different operating modes is characterized in that, mainly is comprised of following steps:
⑴ when insert stockpile when scraper bowl, calculate stockpile to the reaction force of scraper bowl, the resistance of cutting edge and both sides headwall cutting edge before main frictional resistance by scraper bowl bottom and side wall inner surfaces and material, the scraper bowl;
⑵ when promoting swing arm, calculate stockpile to the reaction force of scraper bowl after scraper bowl inserts the stockpile certain depth; Frictional resistance and the frictional resistance between material and scraper bowl between kind, density, lumpiness, material and the material of turn up resistance and material are relevant, and the maximum rotating bucket moment of resistance when maximum turn up resistance can be got by the scraper bowl shovel calculates;
⑶ the gravity of material exists when scraper bowl just inserts material, until the gravity vanishing of material during complete unloading, the gravity of material increases along with the increase of scraper bowl insertion depth, and reaches maximum value in the moment that begins to receive bucket;
⑷ rated output damaed cordition comprises the discharging operating mode, receives bucket to horizontal operating mode, decline swing arm operating mode, and machining device hydraulic system is in Light Condition, can not produce overflow;
Insert operating mode: scraper bowl hydraulic cylinder and the locking of swing arm hydraulic cylinder, machining device hydraulic system is in unloading condition;
Receive the bucket operating mode: the scraper bowl hydraulic cylinder stretches out, and the multiple directional control valve of control scraper bowl hydraulic cylinder utilizes Throttle Principle to control the movement velocity of scraper bowl hydraulic cylinder;
Swing arm promotes operating mode: the swing arm hydraulic cylinder piston stretches out, and the multiple directional control valve of control swing arm hydraulic cylinder utilizes Throttle Principle to control the movement velocity of swing arm hydraulic cylinder piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104630913A CN102966131A (en) | 2012-11-16 | 2012-11-16 | Method for analyzing energy loss of hydraulic system of loader under different work conditions |
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| CN2012104630913A CN102966131A (en) | 2012-11-16 | 2012-11-16 | Method for analyzing energy loss of hydraulic system of loader under different work conditions |
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| CN102966131A true CN102966131A (en) | 2013-03-13 |
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| CN2012104630913A Pending CN102966131A (en) | 2012-11-16 | 2012-11-16 | Method for analyzing energy loss of hydraulic system of loader under different work conditions |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446980A (en) * | 1994-03-23 | 1995-09-05 | Caterpillar Inc. | Automatic excavation control system and method |
| EP0436740B1 (en) * | 1989-08-02 | 1995-11-02 | Kabushiki Kaisha Komatsu Seisakusho | Linear excavation control apparatus in hydraulic excavator |
| JPH10183670A (en) * | 1996-12-20 | 1998-07-14 | Shin Caterpillar Mitsubishi Ltd | Control device for construction machine |
| CN202023208U (en) * | 2010-10-16 | 2011-11-02 | 福州大学 | Loading machine thermal balancing hydraulic system |
-
2012
- 2012-11-16 CN CN2012104630913A patent/CN102966131A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0436740B1 (en) * | 1989-08-02 | 1995-11-02 | Kabushiki Kaisha Komatsu Seisakusho | Linear excavation control apparatus in hydraulic excavator |
| US5446980A (en) * | 1994-03-23 | 1995-09-05 | Caterpillar Inc. | Automatic excavation control system and method |
| JPH10183670A (en) * | 1996-12-20 | 1998-07-14 | Shin Caterpillar Mitsubishi Ltd | Control device for construction machine |
| CN202023208U (en) * | 2010-10-16 | 2011-11-02 | 福州大学 | Loading machine thermal balancing hydraulic system |
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Effective date of abandoning: 20160323 |
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