CN104234118A - Pump for compact excavator - Google Patents
Pump for compact excavator Download PDFInfo
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- CN104234118A CN104234118A CN201310687259.3A CN201310687259A CN104234118A CN 104234118 A CN104234118 A CN 104234118A CN 201310687259 A CN201310687259 A CN 201310687259A CN 104234118 A CN104234118 A CN 104234118A
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Abstract
The invention relates to a pump for a compact excavator. The pump comprises a main pump body and a rotary pump body as well as a power control valve, a load sensitive valve and a pressure cut-off valve which are connected with the main pump body; the power control valve is provided with a rotary valve spool, a valve bush, a power lever, a power valve spool and a spring preload mechanism; the power lever is L-shaped with one side contacting with the right end of the rotary valve spool while the other side contacting with the left end of the power valve spool; the right end of the power valve spool is in contact with the spring preload mechanism; an oil port of the load sensitive valve is communicated with an oil port of each of the pressure cut-off and the power valve; a servo piston contacts with the bottom of the power lever through a push rod, hydraulic oil acts on the push rod through a small hole of the servo piston and then acts on the power lever, and an oil outlet of the rotary pump body leads pressure oil to act on the rotary valve spool to enable total power to be constant; the rotary pump body is in series connection with the main pump body, and an oil inlet of the rotary pump body is connected with an oil tank while the oil outlet of the same is connected with a rotary bulldozing loop. The pump is low in manufacturing cost, high in stability and good in reliability.
Description
Technical field
The present invention relates to machinery manufacturing technology field, particularly a kind of mini-excavator pump.
Background technology
Mini-excavator common is in the market driven by a hydraulic planger pump, and its control mode is load-sensitive, power control etc., and the feature of this kind of plunger displacement pump is: by the peak power of its power valve setting host work; Load-sensitive valve in pump is by comparing pump discharge pressure and the pressure coming from system, and the output flow of control pump.The excavator of this kind of system is when real work, there will be a kind of situation, such as, when swing arm lifting, revolution etc. work simultaneously, because system requirements flow increases suddenly, and POF is inadequate, i.e. undersaturated condition, now in system, load-sensitive valve, recuperation valve work, proportional allocations POF is to the action of each road, therefore some actions will be made slow especially, as turning course, cause the whole work period to lengthen.
Summary of the invention
The object of the invention is the defect overcoming prior art existence, there is provided that a kind of structure is simple, low cost of manufacture, stability are high, good reliability, be convenient to integratedly with other control modes to use as standard module, turn round and the mini-excavator pump of the independently power limitation control mode of bulldozing.
The technical scheme realizing the object of the invention is: a kind of mini-excavator pump, comprises servo piston, revolution and main pump, and exports the power control valve, load-sensitive valve and the pressure shut-off valve that are connected with main pump; Described power control valve comprises valve body, rotary valve key, power lever, screw plug, power spool, valve pocket and springs preload mechanism; Described rotary valve key is arranged in valve pocket; Described valve pocket is arranged in valve body; Described power lever is L-shaped, and the vertical side left end of power lever contacts with the right-hand member of rotary valve key, and right-hand member contacts with the left end of power spool; The right-hand member of described power spool contacts with springs preload mechanism; Described screw plug is connected with valve body by screw thread, and screw plug right side and valve pocket left side offset; The oil-in of described load-sensitive valve is connected with the oil-out of pressure shut-off valve, and the oil-out of load-sensitive valve is connected with the oil-in of power control valve; The oil-in of described pressure shut-off valve leads to the large chamber of servo piston; Described servo piston is touched by the bottom connection of the transverse sides of push rod and power lever, and pump discharge pressure oil is acted on push rod by the hole of servo piston, and push rod, to leverage, makes general power W=PQ keep constant; Described drum pump is serially connected on main pump by connecting shaft cover, and the oil-in of drum pump connects fuel tank, and oil-out connects revolution soil-shifting loop.
The cross section of rotary valve key described in technique scheme is two stage steps shape, and has groove between one-level step and two stage steps; Described valve pocket has groove, between valve pocket and rotary valve key, forms cavity volume A; Described cavity volume A is communicated with drum pump by hydraulic fluid port P1.
Springs preload mechanism described in technique scheme comprises spring, swivel nut and two, left and right spring base; Described swivel nut has groove, and swivel nut is screwed into valve body; Two, described left and right spring base is oppositely arranged in groove, is provided with spring between the spring base of two, left and right.
Described in technique scheme, the bending place of power lever is hinged on the pump housing.
After adopting technique scheme, the present invention has following positive effect:
(1) the present invention increases drum pump, and drum pump only need be serially connected on main pump by connecting shaft cover.Then the oil-in of drum pump is connected fuel tank, oil-out connects revolution, soil-shifting loop, so just can realize drum pump for revolution, soil-shifting loop independent oil supply, and draw a pressure oil act on rotary valve key from drum pump outlet, so just can realize total power output constant.When not needing drum pump pressure oil, itself and main pump collaborate, and also can realize power limitation control, would not affect the function of whole system like this.
(2) the present invention is when independent drum pump work, and excavator by the independent fuel feeding of independent drum pump when turning round, therefore, also can lift swing arm etc. rapidly when turning round, can greatly raise the efficiency.
(3) the present invention's revolution realizes independent oil supply, and the operating characteristics of whole system improves greatly, and antijamming capability is strong, good stability, and safety is high.
(4) the present invention can control with common power, Ioad-sensing control is integrated uses as standard module, and therefore, its versatility is higher, good reliability, so just can reduce costs.
(5) cross section on rotary valve key of the present invention is two stage steps shape, and has groove between one-level step and two stage steps; Described valve pocket has groove, between valve pocket and rotary valve key, forms cavity volume A; Described cavity volume A is communicated with drum pump by hydraulic fluid port P1; When solving revolution and soil-shifting work, lift the shortcomings such as arm is slow, substantially increase operability and the operating efficiency of system.
Accompanying drawing explanation
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the structural representation of power valve of the present invention;
Fig. 3 is part-structure enlarged diagram of the present invention;
Attached number in the figure is: servo piston 1, drum pump 2, main pump 3, power control valve 4, valve body 41, rotary valve key 42, one-level step 421, groove 422, two stage steps 423, power lever 43, screw plug 44, power spool 45, valve pocket 46, groove 461, springs preload mechanism 47, spring 472, swivel nut 474, left and right spring base 471,473, adjustment screw 475, load-sensitive valve 5, pressure shut-off valve 6, push rod 7.
Detailed description of the invention
(embodiment 1)
See Fig. 1 to Fig. 3, a kind of mini-excavator pump, comprise servo piston 1, drum pump 2 and main pump 3, and export the power control valve 4, load-sensitive valve 5, pressure shut-off valve 6 and the push rod 7 that are connected with main pump 3; Power control valve 4 comprises valve body 41, rotary valve key 42, power lever 43, screw plug 44, power spool 45, valve pocket 46 and springs preload mechanism 47; Rotary valve key 42 is arranged in valve pocket 46; Valve pocket 46 is arranged in valve body 41; Power lever 43 is L-shaped, and the bending place of power lever 43 is hinged on the pump housing, and the vertical side left end of power lever 43 contacts with the right-hand member of left spool 42, and right-hand member contacts with the left end of power spool 45; The right-hand member of power spool 45 contacts with springs preload mechanism 47; Screw plug 44 is screwed into valve body 41, and screw plug 44 right side and valve pocket 46 left side offset; Springs preload mechanism comprises spring 472, swivel nut 474 and two, left and right spring base 471,473; Swivel nut 474 has groove, and swivel nut 48 is screwed into valve body 41, and is fixed on the right-hand member of valve body 41 by nut; Two spring bases 49 in left and right are oppositely arranged in groove, are provided with spring between the spring base 49 of two, left and right.
Cross section on rotary valve key 42 is two stage steps shape, and has groove 422 between one-level step 421 and two stage steps 423, valve pocket 46 has groove 461, forms cavity volume A between valve pocket 46 and rotary valve key 42; Cavity volume A is communicated with drum pump by hydraulic fluid port P1.
Drum pump 2 is arranged on the side of main pump 3, is connected with main pump by connecting shaft cover, and the oil-in of drum pump 2 connects fuel tank, and oil-out connects revolution soil-shifting loop; The oil-in of load-sensitive valve 5 is connected with the oil-out of pressure shut-off valve 6, and the oil-out of load-sensitive valve 5 is connected with the oil-in of power control valve 4; The oil-in of pressure shut-off valve 6 leads to the large chamber of servo piston 1; Servo piston 1 is touched by the bottom connection of push rod 7 with the transverse sides of power lever 43.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a mini-excavator pump, comprises servo piston (1), main pump (3), and the power control valve (4), load-sensitive valve (5), pressure shut-off valve (6) and the push rod (7) that are connected with main pump (3); It also has slewing equipment, and described slewing equipment comprises drum pump (2) and rotary valve key (42); Described drum pump is connected with main pump (3) by connecting shaft cover, it is characterized in that: the oil-in of drum pump (2) connects fuel tank, and oil-out connects revolution soil-shifting loop.Described power control valve (4) comprises valve body (41), rotary valve key (42), power lever (43), screw plug (44), power spool (45), valve pocket (46), springs preload mechanism (47); Described rotary valve key (42) is arranged in valve pocket (46); Described valve pocket (46) is arranged in valve body (41); Described power lever (43) is L-shaped, and the vertical side left end of power lever (43) contacts with the right-hand member of rotary valve key (42), and right-hand member contacts with the left end of power spool (45); The right-hand member of described power spool (45) contacts with springs preload mechanism (47); Described screw plug (44) is connected with valve body (41) by screw thread, and screw plug (44) right side and valve pocket (46) left side offset; The oil-in of described load-sensitive valve (5) is connected with the oil-out of pressure shut-off valve (6), and the oil-out of load-sensitive valve (5) is connected with the oil-in of power control valve (4); The oil-in of described pressure shut-off valve (6) leads to the large chamber of servo piston (1); Described servo piston (1) is touched by the bottom connection of push rod (7) with power lever (43).
2. mini-excavator pump according to claim 1, is characterized in that: the cross section in described power valve (4) on rotary valve key (42) is two stage steps shape, and has groove (423) between one-level step (421) and two stage steps (422); Described valve pocket (46) has groove (461), between valve pocket (46) and rotary valve key (42), form cavity volume A; Described cavity volume A is communicated with drum pump (2) by hydraulic fluid port P1.
3. mini-excavator pump according to claim 1, it is characterized in that: drum pump is arranged on main pump side, be connected with main pump by connecting shaft cover, when drum pump works, draw a road pressure oil signal function in rotary valve key from revolution delivery side of pump, make general power W=PQ keep constant.
4. mini-excavator pump according to claim 2, is characterized in that: described springs preload mechanism comprises spring (472), swivel nut (474) and two, left and right spring base (471), (473); (474) have groove to described swivel nut, and swivel nut (474) is screwed into valve body (41); Two, described left and right spring base (471), (473) are oppositely arranged in groove, are provided with spring between two, left and right spring base (471), (473).Spring base (473) contacts with adjustment screw (475), by the preload force of adjustment screw (475) setting spring.Described adjustment screw, by being threaded in swivel nut (474), is fixed on swivel nut (474) by nut.
5. mini-excavator pump according to claim 3, is characterized in that: the bending place of described power lever (43) is hinged on the pump housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310687259.3A CN104234118B (en) | 2013-12-13 | 2013-12-13 | Mini-excavator pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310687259.3A CN104234118B (en) | 2013-12-13 | 2013-12-13 | Mini-excavator pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104234118A true CN104234118A (en) | 2014-12-24 |
| CN104234118B CN104234118B (en) | 2017-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310687259.3A Active CN104234118B (en) | 2013-12-13 | 2013-12-13 | Mini-excavator pump |
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| Country | Link |
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| CN (1) | CN104234118B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63272974A (en) * | 1987-05-01 | 1988-11-10 | Kayaba Ind Co Ltd | Power controller for piston pump |
| JPH08189473A (en) * | 1994-12-28 | 1996-07-23 | Kayaba Ind Co Ltd | Variable pump controller |
| US5554011A (en) * | 1994-10-27 | 1996-09-10 | Symbiosis Corporation | Medical fluid pump powered by a constant source of vacuum |
| CN101550921A (en) * | 2009-05-05 | 2009-10-07 | 上海电气液压气动有限公司 | Variable control system of plunger variable pump |
| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
| CN102865207A (en) * | 2012-08-01 | 2013-01-09 | 安徽博一流体传动股份有限公司 | Axial swash plate type hydraulic plunger pump |
| CN203782783U (en) * | 2013-12-13 | 2014-08-20 | 江苏恒立液压有限公司 | Pump for mini-excavator |
-
2013
- 2013-12-13 CN CN201310687259.3A patent/CN104234118B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63272974A (en) * | 1987-05-01 | 1988-11-10 | Kayaba Ind Co Ltd | Power controller for piston pump |
| US5554011A (en) * | 1994-10-27 | 1996-09-10 | Symbiosis Corporation | Medical fluid pump powered by a constant source of vacuum |
| JPH08189473A (en) * | 1994-12-28 | 1996-07-23 | Kayaba Ind Co Ltd | Variable pump controller |
| CN101550921A (en) * | 2009-05-05 | 2009-10-07 | 上海电气液压气动有限公司 | Variable control system of plunger variable pump |
| CN201461362U (en) * | 2009-05-05 | 2010-05-12 | 上海电气液压气动有限公司 | Variable control mechanism of plunger piston variable pump |
| CN102865207A (en) * | 2012-08-01 | 2013-01-09 | 安徽博一流体传动股份有限公司 | Axial swash plate type hydraulic plunger pump |
| CN203782783U (en) * | 2013-12-13 | 2014-08-20 | 江苏恒立液压有限公司 | Pump for mini-excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104234118B (en) | 2017-01-04 |
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Address after: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant before: JIANGSU HENGLI HYDRAULIC CO., LTD. |
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