CN104386618A - Pressure compensating unloading loop of shearing type lifting machine - Google Patents
Pressure compensating unloading loop of shearing type lifting machine Download PDFInfo
- Publication number
- CN104386618A CN104386618A CN201410475733.0A CN201410475733A CN104386618A CN 104386618 A CN104386618 A CN 104386618A CN 201410475733 A CN201410475733 A CN 201410475733A CN 104386618 A CN104386618 A CN 104386618A
- Authority
- CN
- China
- Prior art keywords
- change
- valve
- over valve
- shearing type
- lifting machine
- 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.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/065—Scissor linkages, i.e. X-configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
Abstract
The invention discloses a pressure compensating unloading loop of a shearing type lifting machine, and belongs to the field of hydraulic transmission. The loop comprises an oil tank, a variable pump, an overflow valve, a reversing valve and a hydraulic cylinder; an inlet oil pipe of the variable pump is connected with the oil tank; an outlet oil pipe is connected with the overflow valve and the reversing valve; the overflow valve and an oil returning pipe of the reversing valve are connected with the oil tank; the hydraulic cylinder is connected to the reversing valve. The loop solves the problem that when an executing element of an existing shearing type lifting machine stops from working in a short time, because of working needs, a hydraulic system with the large hydraulic flow changes is adopted, and consequently unloading is not easy and has the advantages of being simple in structure, reasonable in design and easy to manufacture.
Description
Technical field
The invention belongs to hydrostatic drive field, more particularly, relate to a kind of relief circuit of lifting machine hydraulic efficiency pressure system.
Background technology
Along with the development of automobile industry, vehicle maintenance and repair becomes an emerging industry gradually with maintenance.Wherein lifting machine is as the important tool in vehicle maintenance and repair and servicing operations, have also been obtained and develops faster.Automobile is mainly brought up to another safe altitude from a safe altitude by lifting machine, so that manual operation and maintenance.Current lifting machine has a lot of type, can be divided into mechanical drive and hydrostatic drive according to type of drive.Mechanical transmission structure is simple, low price, but lifting weight is restricted, and leading screw or work nut slide fastener easily occur, and there is larger potential safety hazard.And hydrostatic drive lifting machine safety performance good, operate steadily, easy to maintenance and work efficiency is high, be current lifting machine transmission use mainstream type.For the hydraulic efficiency pressure system of shearing type lifter, when its power element short time quits work, do not need input hydraulic pressure oil, if now take the method for stop solution press pump to carry out the input of stop solution force feed, the life-span of Hydraulic Pump and electrical motor can be affected because of start and stop frequently.For this reason, adopt relief circuit allow Hydraulic Pump off-load, make it with the running of very little horsepower output, thus avoid start and stop frequently.And operationally, adopt the hydraulic efficiency pressure system that hydraulic flow changes greatly because of need of work, the off-load caused problem not easily.
Summary of the invention
For existing shearing type lifter power element when the short time quits work, the hydraulic efficiency pressure system that hydraulic flow changes greatly is adopted because of need of work, cause off-load problem not easily, the invention provides the relief circuit of a kind of shearing type lifter pressure compensation, utilize pressure compensation controllable capacity pump to realize off-load, realize low pressure and mass flow and high-pressure low-flow confession oil performance.
For solving the problem, the present invention adopts following technical scheme.
The relief circuit of a kind of shearing type lifter pressure compensation, comprise fuel tank, controllable capacity pump, by pass valve, change-over valve, hydraulic actuating cylinder, the import oil pipe of described controllable capacity pump is connected with fuel tank, outlet oil pipe is connected with by pass valve, change-over valve respectively, described by pass valve is connected fuel tank with the oil return pipe of change-over valve, and described hydraulic actuating cylinder is connected on change-over valve.
Described change-over valve is 3-position 4-way hand change over valve, and its Median Function is O type, and described controllable capacity pump is pressure compensation controllable capacity pump.
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention utilizes pressure compensation controllable capacity pump to realize off-load, when the pressure of Hydraulic Pump raises the pressure reached needed for compensating device action, the flow of Hydraulic Pump just reduces to the flow only needing to leak in top-up system, consumption of power greatly reduces, complete the off-load of Hydraulic Pump, realize low pressure and mass flow and high-pressure low-flow confession oil performance.
(2) structure of the present invention is simple, reasonable in design, is easy to manufacture.
Accompanying drawing explanation
Fig. 1 is hydraulic scheme of the present invention.
In figure: 1-fuel tank, 2-controllable capacity pump, 3-by pass valve, 4-change-over valve, 5-hydraulic actuating cylinder.
Detailed description of the invention
Describe the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the relief circuit of shearing type lifter pressure compensation comprises fuel tank 1, controllable capacity pump 2, by pass valve 3, change-over valve 4, hydraulic actuating cylinder 5, the import oil pipe of described controllable capacity pump 2 is connected with fuel tank 1, outlet oil pipe is connected with by pass valve 3, change-over valve 4 respectively, described by pass valve 3 is connected fuel tank 1 with the oil return pipe of change-over valve 4, and described hydraulic actuating cylinder 5 is connected on change-over valve 4.
Described change-over valve 4 is 3-position 4-way hand change over valve, and its Median Function is O type, and described controllable capacity pump 2 is pressure compensation controllable capacity pump.
embodiment 1
As shown in Figure 1, the relief circuit of shearing type lifter pressure compensation comprises fuel tank 1, controllable capacity pump 2, by pass valve 3, change-over valve 4, hydraulic actuating cylinder 5, the import oil pipe of described controllable capacity pump 2 is connected with fuel tank 1, outlet oil pipe is connected with by pass valve 3, change-over valve 4 respectively, described by pass valve 3 is connected fuel tank 1 with the oil return pipe of change-over valve 4, and described hydraulic actuating cylinder 5 is connected on change-over valve 4.
Described change-over valve 4 is 3-position 4-way hand change over valve, and its Median Function is O type, and described controllable capacity pump 2 is pressure compensation controllable capacity pump, and described by pass valve 3 is direct-acting overflow valve.
Claims (3)
1. shearing type lifter pressure compensation relief circuit, comprise fuel tank (1), controllable capacity pump (2), by pass valve (3), change-over valve (4), hydraulic actuating cylinder (5), it is characterized in that, the import oil pipe of described controllable capacity pump (2) is connected with fuel tank (1), outlet oil pipe is connected with by pass valve (3), change-over valve (4) respectively, described by pass valve (3) is connected fuel tank (1) with the oil return pipe of change-over valve (4), and described hydraulic actuating cylinder (5) is connected on change-over valve (4).
2. shearing type lifter pressure compensation according to claim 1 relief circuit, is characterized in that, described change-over valve (4) is 3-position 4-way hand change over valve, and its Median Function is O type.
3. shearing type lifter pressure compensation according to claim 1 relief circuit, is characterized in that, described controllable capacity pump (2) is pressure compensation controllable capacity pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475733.0A CN104386618A (en) | 2014-09-18 | 2014-09-18 | Pressure compensating unloading loop of shearing type lifting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475733.0A CN104386618A (en) | 2014-09-18 | 2014-09-18 | Pressure compensating unloading loop of shearing type lifting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104386618A true CN104386618A (en) | 2015-03-04 |
Family
ID=52604602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410475733.0A Pending CN104386618A (en) | 2014-09-18 | 2014-09-18 | Pressure compensating unloading loop of shearing type lifting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104386618A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109094008A (en) * | 2018-08-31 | 2018-12-28 | 中山职业技术学院 | A kind of 3D printing equipment using hydraulic transmission technology |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201357181Y (en) * | 2008-12-31 | 2009-12-09 | 山西大同齿轮集团有限责任公司 | Hydraulic system of straightening machine for straightening shaft components |
| CN203214469U (en) * | 2013-04-28 | 2013-09-25 | 贵州大学 | Single-power hydraulic source constant flow pump pressure compensating device |
| CN203272291U (en) * | 2013-05-10 | 2013-11-06 | 浙江工商职业技术学院 | Workpiece feeding rapid unloading loop |
| CN203272289U (en) * | 2013-05-09 | 2013-11-06 | 浙江工商职业技术学院 | Electromagnetic unloading loop device |
-
2014
- 2014-09-18 CN CN201410475733.0A patent/CN104386618A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201357181Y (en) * | 2008-12-31 | 2009-12-09 | 山西大同齿轮集团有限责任公司 | Hydraulic system of straightening machine for straightening shaft components |
| CN203214469U (en) * | 2013-04-28 | 2013-09-25 | 贵州大学 | Single-power hydraulic source constant flow pump pressure compensating device |
| CN203272289U (en) * | 2013-05-09 | 2013-11-06 | 浙江工商职业技术学院 | Electromagnetic unloading loop device |
| CN203272291U (en) * | 2013-05-10 | 2013-11-06 | 浙江工商职业技术学院 | Workpiece feeding rapid unloading loop |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109094008A (en) * | 2018-08-31 | 2018-12-28 | 中山职业技术学院 | A kind of 3D printing equipment using hydraulic transmission technology |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150304 |