CN104405706A - Double-pump relief circuit of scissor lift - Google Patents
Double-pump relief circuit of scissor lift Download PDFInfo
- Publication number
- CN104405706A CN104405706A CN201410475792.8A CN201410475792A CN104405706A CN 104405706 A CN104405706 A CN 104405706A CN 201410475792 A CN201410475792 A CN 201410475792A CN 104405706 A CN104405706 A CN 104405706A
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- Prior art keywords
- valve
- hydraulic pump
- pump
- oil hydraulic
- oil
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a double-pump relief circuit of a scissor lift, and belongs to the field of hydraulic transmission. The double-pump relief circuit comprises an oil tank, a hydraulic pump A, an overflow valve, a reversing valve, a hydraulic cylinder, a hydraulic pump B, a one-way valve and an unloading valve. An inlet oil pipe of the hydraulic pump A is connected with the oil tank, the overflow valve, the reversing valve and the one-way valve are connected with an outlet oil pipe of the hydraulic pump A, an inlet oil pipe of the hydraulic pump B is connected with the oil tank, the one-way valve and the unloading valve are connected with an outlet oil pipe of the hydraulic pump B, and a control oil circuit of the unloading valve is connected to an outlet oil circuit of the hydraulic pump A. The double-pump relief circuit of the scissor lift solves the problem that unloading is difficult due to the fact that a hydraulic system with large hydraulic flow changes is adopted according to the operational need in the working process of an conventional scissor lift, and has the advantages of being simple in structure, reasonable in design and easy to manufacture.
Description
Technical field
The invention belongs to hydraulic transmission field, more particularly, relate to a kind of relief circuit of lifting machine hydraulic system.
Background technique
Along with the development of automobile industry, auto repair becomes an emerging industry gradually with maintenance.Wherein lifting machine is as the important tool in auto 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 transmission and hydraulic transmission according to the kind 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 hydraulic transmission lifting machine Safety performance good, operate steadily, easy to maintenance and working efficiency is high, be current lifting machine transmission use mainstream type.For the hydraulic system of shearing type lifter, when its executive component 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 oil hydraulic pump and motor can be affected because of start and stop frequently.For this reason, adopt relief circuit allow oil hydraulic pump off-load, make it with the running of very little output power, thus avoid start and stop frequently.And operationally, adopt the hydraulic system that hydraulic flow changes greatly because of need of work, the off-load caused problem not easily.
Summary of the invention
For in existing shearing type lifter working procedure, the hydraulic 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 duplex pump, fuel feeding is carried out by two the oil hydraulic pump composition duplex pump systems adopting flow different with pressure, according to system pressure flow automatic regulation, thus can solve because changes in flow rate causes greatly off-load problem not easily.
For solving the problem, the present invention adopts following technological scheme.
The relief circuit of a kind of shearing type lifter duplex pump, comprise fuel tank, oil hydraulic pump A, relief valve, selector valve, oil hydraulic cylinder, oil hydraulic pump B, one-way valve, unloading valve, the import oil pipe of described oil hydraulic pump A is connected with fuel tank, outlet oil pipe respectively with relief valve, selector valve, one-way valve is connected, described relief valve, selector valve, the return tube of unloading valve connects fuel tank, described oil hydraulic cylinder is connected on selector valve, the import oil pipe of described oil hydraulic pump B is connected with fuel tank, outlet oil pipe respectively with one-way valve, unloading valve is connected, the oil circuit control of described unloading valve is connected on the outlet oil circuit of oil hydraulic pump A.
Described selector valve is three-position four-way electromagnetic directional valve, and its Median Function is O type, and described oil hydraulic pump A is small flow high pressure pump, and described oil hydraulic pump B is large discharge low pressure pump.
Compared to prior art, beneficial effect of the present invention is:
(1) the present invention carrys out fuel feeding by two the oil hydraulic pump composition duplex pump systems adopting flow different with pressure, according to system pressure flow automatic regulation, thus can solve because changes in flow rate causes greatly off-load problem not easily.
(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-oil hydraulic pump A, 3-relief valve, 4-selector valve, 5-oil hydraulic cylinder, 6-oil hydraulic pump B, 7-one-way valve, 8-unloading valve.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the relief circuit of shearing type lifter duplex pump comprises fuel tank 1, oil hydraulic pump A2, relief valve 3, selector valve 4, oil hydraulic cylinder 5, oil hydraulic pump B6, one-way valve 7, unloading valve 8, the import oil pipe of described oil hydraulic pump A2 is connected with fuel tank 1, outlet oil pipe respectively with relief valve 3, selector valve 4, one-way valve 7 is connected, described relief valve 3, selector valve 4, the return tube of unloading valve 8 connects fuel tank 1, described oil hydraulic cylinder 5 is connected on selector valve 4, the import oil pipe of described oil hydraulic pump B6 is connected with fuel tank 1, outlet oil pipe respectively with one-way valve 7, unloading valve 8 is connected, the oil circuit control of described unloading valve 8 is connected on the outlet oil circuit of oil hydraulic pump A2.
Described selector valve 4 is three-position four-way electromagnetic directional valve, and its Median Function is O type, and described oil hydraulic pump A2 is small flow high pressure pump, and described oil hydraulic pump B6 is large discharge low pressure pump.
embodiment 1
As shown in Figure 1, the relief circuit of shearing type lifter duplex pump comprises fuel tank 1, oil hydraulic pump A2, relief valve 3, selector valve 4, oil hydraulic cylinder 5, oil hydraulic pump B6, one-way valve 7, unloading valve 8, the import oil pipe of described oil hydraulic pump A2 is connected with fuel tank 1, outlet oil pipe respectively with relief valve 3, selector valve 4, one-way valve 7 is connected, described relief valve 3, selector valve 4, the return tube of unloading valve 8 connects fuel tank 1, described oil hydraulic cylinder 5 is connected on selector valve 4, the import oil pipe of described oil hydraulic pump B6 is connected with fuel tank 1, outlet oil pipe respectively with one-way valve 7, unloading valve 8 is connected, the oil circuit control of described unloading valve 8 is connected on the outlet oil circuit of oil hydraulic pump A2.
Described selector valve 4 is three-position four-way electromagnetic directional valve, and its Median Function is O type, and described oil hydraulic pump A2 is small flow high pressure pump, and described oil hydraulic pump B6 is large discharge low pressure pump, and described relief valve 3 is direct-acting overflow valve.
Claims (4)
1. shearing type lifter duplex pump relief circuit, comprise fuel tank (1), oil hydraulic pump A(2), relief valve (3), selector valve (4), oil hydraulic cylinder (5), oil hydraulic pump B(6), one-way valve (7), unloading valve (8), it is characterized in that, described oil hydraulic pump A(2) import oil pipe be connected with fuel tank (1), outlet oil pipe respectively with relief valve (3), selector valve (4), one-way valve (7) is connected, described relief valve (3), selector valve (4), the return tube of unloading valve (8) connects fuel tank (1), described oil hydraulic cylinder (5) is connected on selector valve (4), described oil hydraulic pump B(6) import oil pipe be connected with fuel tank (1), outlet oil pipe respectively with one-way valve (7), unloading valve (8) is connected, the oil circuit control of described unloading valve (8) is connected to oil hydraulic pump A(2) outlet oil circuit on.
2. shearing type lifter duplex pump according to claim 1 relief circuit, is characterized in that, described selector valve (4) is three-position four-way electromagnetic directional valve, and its Median Function is O type.
3. shearing type lifter duplex pump according to claim 1 relief circuit, is characterized in that, described oil hydraulic pump A(2) be small flow high pressure pump.
4. shearing type lifter duplex pump according to claim 1 relief circuit, is characterized in that, described oil hydraulic pump B(6) be large discharge low pressure pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475792.8A CN104405706A (en) | 2014-09-18 | 2014-09-18 | Double-pump relief circuit of scissor lift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475792.8A CN104405706A (en) | 2014-09-18 | 2014-09-18 | Double-pump relief circuit of scissor lift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104405706A true CN104405706A (en) | 2015-03-11 |
Family
ID=52643359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410475792.8A Pending CN104405706A (en) | 2014-09-18 | 2014-09-18 | Double-pump relief circuit of scissor lift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405706A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105570208A (en) * | 2015-12-19 | 2016-05-11 | 嘉善海力达工具有限公司 | Noise-reducing dual-circuit oil pump |
| CN109854558A (en) * | 2019-03-29 | 2019-06-07 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering truck |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295250A (en) * | 2011-08-30 | 2011-12-28 | 陈海波 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
| CN203144016U (en) * | 2013-04-15 | 2013-08-21 | 宁波赛维思机械有限公司 | Ultrahigh voltage electric hydraulic pump station |
-
2014
- 2014-09-18 CN CN201410475792.8A patent/CN104405706A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295250A (en) * | 2011-08-30 | 2011-12-28 | 陈海波 | Dual pump converging energy-saving control system for hydraulic system of forklift truck |
| CN203144016U (en) * | 2013-04-15 | 2013-08-21 | 宁波赛维思机械有限公司 | Ultrahigh voltage electric hydraulic pump station |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105570208A (en) * | 2015-12-19 | 2016-05-11 | 嘉善海力达工具有限公司 | Noise-reducing dual-circuit oil pump |
| CN109854558A (en) * | 2019-03-29 | 2019-06-07 | 徐工集团工程机械股份有限公司科技分公司 | Hydraulic system and engineering truck |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150311 |