CN111270725A - Device for realizing power switching of hydraulic pump of wheel type excavator - Google Patents
Device for realizing power switching of hydraulic pump of wheel type excavator Download PDFInfo
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- CN111270725A CN111270725A CN202010109214.8A CN202010109214A CN111270725A CN 111270725 A CN111270725 A CN 111270725A CN 202010109214 A CN202010109214 A CN 202010109214A CN 111270725 A CN111270725 A CN 111270725A
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- wheel type
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- 230000001681 protective effect Effects 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
The invention relates to a device for realizing power switching of a hydraulic pump of a wheel type excavator, belonging to the technical field of hydraulic pumps of wheel type hydraulic excavators; the hydraulic pump power switching device comprises a nut, a clamp spring and a mandril; one end of the nut is connected with a valve body of a hydraulic pump control valve, and the other end of the nut is provided with threads connected with an oil guide port of the whole machine; one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a mandril which can move back and forth; a snap spring used for limiting the ejector rod is arranged in the nut. The power switching of the hydraulic pump is realized by the back-and-forth movement of the ejector rod, so that the problem that the constant power design value of the hydraulic plunger pump for the conventional wheel excavator is fixed and single and cannot meet the comprehensive requirements of users on efficiency and energy consumption is solved; the structure of the hydraulic plunger pump control unit is optimized to meet the customized requirements of users, and the provided hydraulic pump can realize two different constant power design values so as to meet the requirements of comprehensive requirements of efficiency and energy consumption provided by the users; the invention has simple structure and convenient use.
Description
Technical Field
The invention relates to a device for realizing power switching of a hydraulic pump of a wheel type excavator, and belongs to the technical field of hydraulic pumps of wheel type hydraulic excavators.
Background
In the technical field of hydraulic plunger pumps related to wheel type hydraulic excavators, at present, the manufacturers of known hydraulic components at home and abroad usually adopt a constant power control mode when providing a swash plate type plunger pump of a hydraulic excavator, the constant power control is to limit the maximum power of a hydraulic pump, when the system pressure is high and the required flow is also large, the output power of the pump can operate according to a total power curve limited by design, the product of the system pressure and the output flow of the plunger pump (the output power of the pump) is ensured to be approximately a constant value, and the function can ensure that the overload phenomenon is avoided when the hydraulic pump works under the super-saturation condition, thereby playing a role in protecting an engine and a whole system. The design value of the constant power of the hydraulic plunger pump is determined by the power value of an engine allocated by a system, but each engine manufacturer has clear and uniform regulations on the limit of the highest power, so that when the requirements of different users and different working conditions on the working efficiency and energy consumption saving of an excavator are met, the requirements of customers on the efficiency and energy consumption cannot be met only by fixing a single constant power design value by a hydraulic pump, for example, a wheel type excavator requires high speed during walking and reduces the auxiliary time of production operation, and when the excavator works, the hydraulic plunger pump needs to walk at low speed to save energy, so that the hydraulic plunger pump is required to work under two different working conditions and needs to be realized by two different power design values, and therefore, an optimized device which is suitable for multiple working conditions and can realize the power switching of the hydraulic pump is urgently developed.
Disclosure of Invention
The invention aims to solve the technical problem that the power of a hydraulic pump of a hydraulic excavator can be switched conveniently.
In order to solve the problems, the technical scheme adopted by the invention is to provide a device for realizing power switching of a hydraulic pump of a wheel type excavator, which comprises a nut, a clamp spring and a mandril; one end of the nut is connected with a valve body of a hydraulic pump control valve, and the other end of the nut is provided with threads connected with an oil guide port of the whole machine; one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a mandril which can move back and forth; and a clamp spring used for limiting the ejector rod is arranged in the nut.
Preferably, one end of the nut, which is connected with the oil guide port of the whole machine, is provided with a protective plug.
Preferably, one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a thread connected with the valve body of the control valve.
Preferably, the ejector rod comprises a rod body and a base; a rod body is arranged on the base; the one end that the hydraulic pump control valve body was connected to the nut is equipped with the restriction the ejector pin base shifts out the nut limit structure of nut, and limit structure is equipped with the through-hole of wearing out the ejector pin body of rod.
Preferably, the nut limiting structure and the nut are integrally formed.
Preferably, a space for the ejector rod base to move back and forth is arranged between the nut limiting structure and the clamp spring.
Preferably, the plane of the clamp spring is perpendicular to the central axis of the ejector rod, and the clamp spring is clamped on the inner wall of the nut.
Compared with the prior art, the invention has the following beneficial effects:
the invention solves the problems that the constant power design value of the hydraulic plunger pump for the conventional wheel excavator is fixed and single and cannot meet the comprehensive requirements of users on efficiency and energy consumption, and the structure of the control unit of the hydraulic plunger pump is optimized, so that the hydraulic pump can be customized according to the requirements of the users, and two different constant power design values are realized for the hydraulic pump, so that the requirements of the comprehensive requirements of the efficiency and the energy consumption provided by various users and working conditions are met; the invention has simple structure and convenient use.
Drawings
FIG. 1 is a schematic diagram of a power control unit for a hydraulic plunger pump;
FIG. 2 is a schematic structural diagram of a control unit with a hydraulic pump power switching device according to the present invention;
FIG. 3 is a schematic sectional view of a power switching device of a hydraulic pump according to the present invention;
reference numerals: 1. the protection plug 2, the nut 3, the clamp spring 4, the ejector rod 5, the power control unit 6, the power switching device D1, the nut ejector rod hole thickness D2. ejector rod base and the nut ejector rod hole distance;
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
as shown in fig. 1-3, the invention provides a device for realizing power switching of a hydraulic pump of a wheel excavator, which comprises a nut 2, a clamp spring 3 and a mandril 4; one end of the nut 2 is connected with a valve body of the hydraulic pump control valve, and the other end of the nut is provided with threads connected with an oil guide port of the whole machine; one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a mandril 4 which can move back and forth; a clamp spring 3 used for limiting the movement of the ejector rod is arranged in the nut 2. One end of the nut 2 connected with the oil guide port of the whole machine is provided with a protective plug 1. One end of the nut 2 connected with the valve body of the hydraulic pump control valve is provided with a thread connected with the valve body of the control valve. The ejector rod 4 comprises a rod body and a base; the base is connected with a rod body; one end of the nut 2 connected with the valve body of the hydraulic pump control valve is provided with a nut limiting structure for limiting the ejector rod base to move out of the nut, and the limiting structure is provided with a through hole penetrating out of the ejector rod body. The nut limiting structure and the nut are integrally formed. A space for the ejector rod base to move back and forth is arranged between the nut limiting structure and the clamp spring 3. The plane of the clamp spring 3 is vertical to the central axis of the ejector rod, and the clamp spring 3 is clamped on the inner wall of the nut.
As shown in fig. 1, in a conventional hydraulic plunger pump power control unit 5, the maximum power of the hydraulic pump power and the power curve characteristic are set by a hydraulic test bench, and once the maximum power and the power curve characteristic are set, the change is only affected by the system hydraulic pressure and the stiffness of a spring.
As shown in fig. 2, in order to provide a schematic structural diagram of a control unit 5 with a hydraulic pump power switching device 6 according to the present invention, a nut 2 may be connected to a control valve body through a thread to fix the entire hydraulic pump power switching device 6, and the other end may be connected through a G1/4 thread, when the plunger pump assembly leaves the factory, a protection plug 1 is added to the end to perform the functions of dust prevention and oil leakage prevention. When the plunger pump is assembled to the wheel type excavator, the protective plug 1 is cancelled, and then the hydraulic pump power switching device 6 is supplied with driving hydraulic oil through the oil guide port of the threaded connection whole machine line at the end. As shown in fig. 3, the inner snap spring 3 is fixed on the nut 2, so that the axial limit of the ejector rod 4 is realized, the axial movement (non-spring side) of the ejector rod 4 in the nut 2 is avoided, and the fluctuation and even failure of the whole structure function are avoided. As shown in fig. 3, the ram 4 is axially guided by a length that is clearance-fitted into the ram hole of the nut 2. The wheel type excavator can realize the shearing control of power only by installing a control switch of a power shearing pilot oil way of a power switching device for supplying the hydraulic pump; when the pilot switch is opened, the wheel type excavator provides pilot oil, the ejector rod 4 moves towards the spring side of the hydraulic pump control valve body until the base of the ejector rod 4 is limited by the plane of the limiting structure of the nut 2, power shearing is realized, and the power of the hydraulic pump is the minimum at the moment; when the pilot switch is closed, pilot oil supply is cancelled, the ejector rod 4 resets under the action of spring force, the constant power value of the hydraulic pump returns to the designed initial set value, the ejector rod 4 returns, and the position is limited through the inner clamp spring 3, so that the stable structure is ensured.
As shown in fig. 3, to achieve the requirement of different variable powers for multiple users, the size of diagram 3 may be: the nut ejector pin hole thickness D1 and the ejector pin base to nut ejector pin hole opening distance D2 are adjusted and designed and manufactured according to customer requirements to meet the customization requirements of users on minimum power and the requirements of multiple users on different variable powers.
According to the invention, whether pilot oil enters a hydraulic pump power switching device 6 is controlled by a pilot switch on the wheel type excavator, when the pilot switch is opened, the pilot oil acts on the ejector rod 4, overcomes the spring force to move upwards, compresses the spring upwards, realizes power shear, and when the ejector rod 4 is limited by a nut 2 limiting structure plane, the constant power set value is minimum at the moment so as to achieve the energy-saving effect in the working process of the wheel type excavator; when the pilot switch is closed, the ejector rod 4 is reset under the action of the spring force, and the inner clamp spring 3 is used for axial limiting, so that the situation that the lead part of the ejector rod 4 falls off the nut 2 to cause functional fluctuation and even failure of the whole power shear structure is avoided. After the ejector rod 4 is reset under the action of spring force, the constant power value of the hydraulic pump is the initial factory set value at the moment, the power is maximum, the excavator can rapidly walk, and the purpose of reducing the auxiliary operation time is achieved.
Through this structure, can satisfy the efficiency that various users, under the multiplex condition put forward and the requirement of energy consumption synthesis, through D1 size in the change nut 2, D2 size in the ejector pin 4, under the effective rigidity of spring, can realize the function that multiple low-power numerical value set for.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a realize wheeled excavator hydraulic pump power switching's device which characterized in that: comprises a nut, a clamp spring and a mandril; one end of the nut is connected with a valve body of a hydraulic pump control valve, and the other end of the nut is provided with threads connected with an oil guide port of the whole machine; one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a mandril which can move back and forth; and a clamp spring used for limiting the ejector rod is arranged in the nut.
2. The device for switching the power of the hydraulic pump of the wheel type excavator according to claim 1, wherein: one end of the nut, which is connected with the oil guide port of the whole machine, is provided with a protective plug.
3. The device for switching the power of the hydraulic pump of the wheel type excavator according to claim 1, wherein: one end of the nut connected with the valve body of the hydraulic pump control valve is provided with a thread connected with the valve body of the control valve.
4. The device for switching the power of the hydraulic pump of the wheel type excavator according to claim 1, wherein: the ejector rod comprises a rod body and a base; a rod body is arranged on the base; the one end that the hydraulic pump control valve body was connected to the nut is equipped with the restriction the ejector pin base shifts out the nut limit structure of nut, and limit structure is equipped with the through-hole of wearing out the ejector pin body of rod.
5. The device for realizing power switching of the hydraulic pump of the wheel type excavator according to claim 4, wherein: the nut limiting structure and the nut are integrally formed.
6. The device for switching power of hydraulic pump of wheel excavator according to claim 5, wherein: and a space for the ejector rod base to move back and forth is arranged between the nut limiting structure and the clamp spring.
7. The device for switching power of hydraulic pump of wheel excavator according to claim 6, wherein: the clamp spring plane is set to be perpendicular to the central axis of the ejector rod, and the clamp spring is clamped on the inner wall of the nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010109214.8A CN111270725A (en) | 2020-02-21 | 2020-02-21 | Device for realizing power switching of hydraulic pump of wheel type excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010109214.8A CN111270725A (en) | 2020-02-21 | 2020-02-21 | Device for realizing power switching of hydraulic pump of wheel type excavator |
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| Publication Number | Publication Date |
|---|---|
| CN111270725A true CN111270725A (en) | 2020-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010109214.8A Pending CN111270725A (en) | 2020-02-21 | 2020-02-21 | Device for realizing power switching of hydraulic pump of wheel type excavator |
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| CN (1) | CN111270725A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639195A (en) * | 1984-01-19 | 1987-01-27 | Linde Aktiengesellschaft | Power control devices for hydrostatic pumps |
| KR100814499B1 (en) * | 2007-04-02 | 2008-03-18 | 주식회사 파카한일유압 | Crawler type excavator trafficability improvement duplex control spool valve |
| CN110219789A (en) * | 2019-05-28 | 2019-09-10 | 龙工（上海）精工液压有限公司 | A kind of hydraulic pump power shear mechanism |
| CN212336145U (en) * | 2020-02-21 | 2021-01-12 | 龙工（上海）精工液压有限公司 | Device for realizing power switching of hydraulic pump of wheel type excavator |
-
2020
- 2020-02-21 CN CN202010109214.8A patent/CN111270725A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639195A (en) * | 1984-01-19 | 1987-01-27 | Linde Aktiengesellschaft | Power control devices for hydrostatic pumps |
| KR100814499B1 (en) * | 2007-04-02 | 2008-03-18 | 주식회사 파카한일유압 | Crawler type excavator trafficability improvement duplex control spool valve |
| CN110219789A (en) * | 2019-05-28 | 2019-09-10 | 龙工（上海）精工液压有限公司 | A kind of hydraulic pump power shear mechanism |
| CN212336145U (en) * | 2020-02-21 | 2021-01-12 | 龙工（上海）精工液压有限公司 | Device for realizing power switching of hydraulic pump of wheel type excavator |
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