CN203782783U - Pump for mini-excavator - Google Patents
Pump for mini-excavator Download PDFInfo
- Publication number
- CN203782783U CN203782783U CN201320828613.5U CN201320828613U CN203782783U CN 203782783 U CN203782783 U CN 203782783U CN 201320828613 U CN201320828613 U CN 201320828613U CN 203782783 U CN203782783 U CN 203782783U
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- CN
- China
- Prior art keywords
- valve
- pump
- power
- oil
- rotary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000036316 preload Effects 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 5
- 239000002828 fuel tank Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 230000009131 signaling function Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Abstract
The utility model relates to a pump for a mini-excavator. The pump for the mini-excavator comprises a main pump, a rotary pump, a power control valve, a load-sensitive valve and a pressure stop valve, wherein the power control valve, the load-sensitive valve and the pressure stop valve are connected with the main pump. The power control valve is provided with a rotary valve element, a valve bush, a power lever, a power valve element and a spring preloading mechanism. The power lever is shaped like L, one side of the power lever makes contact with the right end of the rotary valve element, and the other side of the power lever makes contact with the left end of the power valve element. The right end of the power valve element makes contact with the spring preloading mechanism. An oil port of the load-sensitive valve is communicated with an oil port of the pressure stop valve and an oil port of the power valve. A servo piston makes contact with the bottom of the power lever through an ejector rod, hydraulic oil acts on the ejector rod through a small hole of the servo piston and then acts on the power lever, and meanwhile a path of pressure oil is guided by an oil outlet of the rotary pump to act on the rotary valve element, so that the total power is constant. The rotary pump is connected with the main pump in series, wherein an oil inlet of the rotary pump is connected with an oil tank, and the oil outlet of the rotary pump is connected with a rotary bulldozing loop. The pump for the mini-excavator is low in manufacturing cost, high in stability and good in reliability.
Description
Technical field
The utility model relates to machinery manufacturing technology field, particularly a kind of mini-excavator pump.
Background technology
Common mini-excavator is driven by a hydraulic planger pump in the market, and its control mode is load-sensitive, power control etc., and the feature of this kind of plunger displacement pump is: the peak power of setting host work by its power valve; Load-sensitive valve in pump is by pump discharge pressure and the pressure that comes from system are compared, and the output flow of control pump.The excavator of this kind of system is in the time of real work, there will be a kind of situation, for example, in the time that swing arm lifting, revolution etc. are worked simultaneously, because system requirements flow increases suddenly, and POF is inadequate, i.e. undersaturated condition, now in system, load-sensitive valve, recuperation valve work, the action of equal proportion dispensing pump output flow Dao Ge road, therefore will make some actions slow especially, as turning course, cause the whole work period to lengthen.
Utility model content
The purpose of this utility model is to overcome the defect that prior art exists, provide that a kind of simple in structure, low cost of manufacture, stability are high, good reliability, be convenient to use as standard module with other control modes are integrated revolution and the independently mini-excavator pump of permanent power control mode of bulldozing.
The technical scheme that realizes the utility model object is: a kind of mini-excavator pump, comprise servo piston, main pump, and the power control valve, load-sensitive valve, pressure shut-off valve and the push rod that are connected with main pump; It also has slewing equipment, and described slewing equipment comprises drum pump and rotary valve key; Described drum pump is overlapped with main pump and is connected by connecting shaft, it is characterized in that: the oil-in of drum pump connects fuel tank, oil-out connects revolution soil-shifting loop, and described power control valve comprises valve body, rotary valve key, power lever, screw plug, power spool, valve pocket, 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 touches by the bottom connection of push rod and power lever.
Cross section in described power valve on rotary valve key is two stage steps shape, and has groove between one-level step and two stage steps; On described valve pocket, have groove, between valve pocket and rotary valve key, form cavity volume A; Described cavity volume A is communicated with drum pump by hydraulic fluid port P1.
Drum pump is arranged on main pump one side, in the time that drum pump works, from revolution delivery side of pump Yin Yi road pressure oil signal function in rotary valve key, makes general power W=PQ keep constant.
Described springs preload mechanism comprises spring, swivel nut, left spring seat and right spring base; On described swivel nut, have groove, swivel nut is screwed into valve body; Described left spring seat and right spring base are oppositely arranged in groove, between left spring seat and right spring base, be provided with spring, right spring base contacts with adjustment screw, by the preload force of adjustment screw setting spring, described adjustment screw is screwed in swivel nut by screw thread, is fixed on swivel nut by nut.
The bending place of described power lever is hinged on the pump housing.
A kind of mini-excavator pump, comprises servo piston, revolution and main pump, and the outlet power control valve, load-sensitive valve and the pressure shut-off valve that are connected with main pump; It also has slewing equipment, and described slewing equipment comprises drum pump and rotary valve key, and 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 touches by the bottom connection of the transverse sides of push rod and power lever, the hole of pump discharge pressure oil by servo piston is to push rod effect, push rod is to leverage, in the time that drum pump works, from revolution delivery side of pump Yin Yi road pressure oil signal function in rotary valve key, make 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.
Described in technique scheme, the cross section of rotary valve key is two stage steps shape, and has groove between one-level step and two stage steps; On described valve pocket, have groove, between valve pocket and rotary valve key, form cavity volume A; Described cavity volume A is communicated with drum pump by hydraulic fluid port P1.
Described in technique scheme, springs preload mechanism comprises spring, swivel nut and two of left and right spring base; On described swivel nut, have groove, swivel nut is screwed into valve body; Two of described left and right spring base is oppositely arranged in groove, between two spring bases in left and right, be provided with spring, right spring base contacts with adjustment screw, by the preload force of adjustment screw setting spring, described adjustment screw is screwed in swivel nut by screw thread, is fixed on swivel nut by nut.
Described in technique scheme, the bending place of power lever is hinged on the pump housing.
Adopt after technique scheme, the utlity model has following positive effect:
(1) the utility model 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 to fuel tank, oil-out connects revolution, soil-shifting loop, so just can realize drum pump for revolution, soil-shifting loop independent oil supply, act on rotary valve key and draw a pressure oil from drum pump outlet, so just can realize total power output constant.In the time not needing drum pump pressure oil, itself and main pump collaborate, and also can realize permanent power control, so just can not affect the function of whole system.
(2) the utility model is in the time of independent drum pump work, and excavator by the independent fuel feeding of independent drum pump, therefore, also can lift rapidly swing arm etc. in the time of revolution in the time of revolution, can greatly raise the efficiency.
(3) the utility model revolution realizes independent oil supply, and the operating characteristics of whole system improves greatly, and antijamming capability is strong, good stability, safe.
(4) the utility model can use as standard module with common power control, load-sensitive control integration, and therefore, its versatility is higher, and good reliability so just can reduce costs.
(5) cross section on the utility model rotary valve key is two stage steps shape, and has groove between one-level step and two stage steps; On described valve pocket, have groove, between valve pocket and rotary valve key, form cavity volume A; Described cavity volume A is communicated with drum pump by hydraulic fluid port P1; While having solved revolution and soil-shifting work, lift the shortcomings such as arm is slow, greatly improved operability and the operating efficiency of system.
Brief description of the drawings
For content of the present utility model is more easily expressly understood, according to specific embodiment also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is the structural representation of the utility model power valve;
Fig. 3 is the utility model part-structure enlarged diagram;
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 spring seat 471, right spring base 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, comprises servo piston 1, drum pump 2 and main pump 3, and the outlet 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 sides and valve pocket 46 left sides offset; Springs preload mechanism comprises spring 472, swivel nut 474, left spring seat 471 and right spring base 473; On swivel nut 474, have groove 461, swivel nut 48 is screwed into valve body 41, and is fixed on the right-hand member of valve body 41 by nut; Left spring seat 471 and right spring base 473 are oppositely arranged in groove 461, between left spring seat 471 and right spring base 473, are provided with spring 472.
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, has groove 461 on valve pocket 46, between valve pocket 46 and rotary valve key 42, forms cavity volume A; Cavity volume A is communicated with drum pump by hydraulic fluid port P1.
Drum pump 2 is arranged on a side of main pump 3, is connected with main pump 3 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 touches by push rod 7 and the bottom connection of the transverse sides of power lever 43.
Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. a mini-excavator pump, comprise 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 (2) is overlapped with main pump (3) and is connected by connecting shaft, it is characterized in that: the oil-in of drum pump (2) connects fuel tank, oil-out connects revolution soil-shifting loop, and 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) touches by push rod (7) and the bottom connection of power lever (43).
2. mini-excavator pump according to claim 1, it 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); On described valve pocket (46), have 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, is characterized in that: drum pump is arranged on main pump one side, in the time that drum pump works, from revolution delivery side of pump Yin Yi road pressure oil signal function in rotary valve key, makes 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), left spring seat (471) and right spring base (473); On described swivel nut (474), have groove (461), swivel nut (474) is screwed into valve body (41); Described left spring seat (471) and right spring base (473) are oppositely arranged in groove, between left spring seat (471) and right spring base (473), be provided with spring (472), right spring base (473) contacts with adjustment screw (475), by the preload force of adjustment screw (475) setting spring, described adjustment screw (475) is screwed in swivel nut (474) by screw thread, 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 |
|---|---|---|---|
| CN201320828613.5U CN203782783U (en) | 2013-12-13 | 2013-12-13 | Pump for mini-excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320828613.5U CN203782783U (en) | 2013-12-13 | 2013-12-13 | Pump for mini-excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203782783U true CN203782783U (en) | 2014-08-20 |
Family
ID=51318985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320828613.5U Expired - Lifetime CN203782783U (en) | 2013-12-13 | 2013-12-13 | Pump for mini-excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203782783U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234118A (en) * | 2013-12-13 | 2014-12-24 | 江苏恒立液压有限公司 | Pump for compact excavator |
| CN109854471A (en) * | 2019-02-01 | 2019-06-07 | 中航力源液压股份有限公司 | The hydraulic planger pump of two grades of power control devices |
-
2013
- 2013-12-13 CN CN201320828613.5U patent/CN203782783U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234118A (en) * | 2013-12-13 | 2014-12-24 | 江苏恒立液压有限公司 | Pump for compact excavator |
| CN104234118B (en) * | 2013-12-13 | 2017-01-04 | 江苏恒立液压科技有限公司 | Mini-excavator pump |
| CN109854471A (en) * | 2019-02-01 | 2019-06-07 | 中航力源液压股份有限公司 | The hydraulic planger pump of two grades of power control devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Patentee after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213167, No. 99, long hidden Road, Wujin hi tech Industrial Development Zone, Changzhou, Jiangsu, Changzhou Patentee before: JIANGSU HENGLI HYDRAULIC CO., LTD. |
|
| CP03 | Change of name, title or address |