CN204873719U - Quick -witted hydraulic control system lifts - Google Patents
Quick -witted hydraulic control system lifts Download PDFInfo
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- CN204873719U CN204873719U CN201520570874.0U CN201520570874U CN204873719U CN 204873719 U CN204873719 U CN 204873719U CN 201520570874 U CN201520570874 U CN 201520570874U CN 204873719 U CN204873719 U CN 204873719U
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Abstract
The utility model discloses a quick -witted hydraulic control system lifts, including oil tank, hydraulic pump, check valve and pneumatic cylinder, the oil pipe that advances of hydraulic pump links to each other with the oil tank, and the play oil pipe of hydraulic pump links to each other with check valve and pilot operated compound relief valve, the check valve links to each other with the P mouth of second switching -over valve, and the A mouth of second switching -over valve is connected with the pole chamber one end that has of pneumatic cylinder through third switching -over valve, and the B mouth of second switching -over valve passes through one -way throttle valve and is connected with the no pole chamber one end of pneumatic cylinder, guide's class control hydraulic fluid port of pilot operated compound relief valve is linked together with the P mouth of first switching -over valve, and the A mouth of first switching -over valve is connected with first overflow valve, and the B mouth of first switching -over valve is connected with the second overflow valve. This novel structural design is reasonable, and easily the manufacturing sets up the differential circuit, and the F. F. The worker that accomplish the machine of lifting easily advance and descend to move, compare and use the variable pump, have saved the cost, and the multistage pressure adjustment of implementation system satisfies different pressure demands, the practicality is strong.
Description
Technical field
The utility model relates to a kind of hydraulic control circuit, specifically a kind of lifting machine hydraulic control 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.Hydraulic actuating cylinder because of need of work usually slow down, or accelerates to advance, and the power hydraulic system of current lifting machine uses controllable capacity pump usually, realizes slowing down or accelerating, but select flow pump significantly to raise the cost by the flow changing Hydraulic Pump; In addition, existing lifting machine pressure can not realize different stage and regulate, and causes its service conditions to be restricted.
Utility model content
The purpose of this utility model is to provide a kind of lifting machine hydraulic control system, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of lifting machine hydraulic control system, comprise fuel tank, Hydraulic Pump, check valve and hydraulic actuating cylinder, the oil inlet of described Hydraulic Pump is connected with fuel tank, and the oil outlet pipe of described Hydraulic Pump is connected with check valve and pilot overflow valve; Described check valve is connected with the P mouth of the second change-over valve, and the A mouth of described second change-over valve is connected with rod chamber one end of hydraulic actuating cylinder by the 3rd change-over valve, and the B mouth of described second change-over valve is connected with rodless cavity one end of hydraulic actuating cylinder by one-way throttle valve; Pipeline between described one-way throttle valve and hydraulic actuating cylinder is also provided with a differential branch road, the described differential branch road other end is connected to the 3rd change-over valve; The control port of the pilot stage of described pilot overflow valve is connected with the P mouth of the first change-over valve, and the A mouth of described first change-over valve is connected with the first by pass valve, and the B mouth of described first change-over valve is connected with the second by pass valve; The T mouth of described first change-over valve and the second change-over valve is connected with fuel tank, and the return opening of described pilot overflow valve, the first by pass valve and the second by pass valve is connected with fuel tank.
As further program of the utility model: described Hydraulic Pump is gear type pump.
As the utility model further scheme: described first by pass valve and the second by pass valve are direct-acting overflow valve, and the setting value of the first by pass valve and the second by pass valve is less than the setting value of pilot overflow valve.
As the utility model further scheme: described first change-over valve and the second change-over valve are three-position four-way electromagnetic directional valve, and Median Function is O shape.
As the utility model further scheme: described 3rd change-over valve is two position three way directional control valve.
Compared with prior art, the beneficial effects of the utility model are: arrange check valve and be used for preventing hydraulic oil refluence impact failure system element; By the use of differential circuit be made up of branch road and the 3rd change-over valve, achieving the F.F. of the hydraulic actuating cylinder when not changing Hydraulic Pump flow, greatly saving work-hours; By arranging the position of travel switch, determine hydraulic actuating cylinder F.F. change a job into particular location, when hydraulic actuating cylinder is to assigned address, travel switch sender also controls the 3rd change-over valve Y5 end dead electricity, thus hydraulic actuating cylinder work is entered, make operation more convenient, and do not need, by using controllable capacity pump, to provide cost savings; The multistage pressure being realized system by the use of pilot overflow valve, the first change-over valve, the first by pass valve and the second by pass valve is regulated, and makes lifting machine can realize regulating according to the needs of different pressures; Mechanism is simple, reasonable in design, is easy to manufacture.
In sum, this new structural design is reasonable, is easy to manufacture, arranges differential circuit, complete the F.F. of lifting machine easily, work enters and down maneuver, compare use controllable capacity pump, provide cost savings; And the multistage pressure realizing system regulates, and meets different pressure demand, practical.
Accompanying drawing explanation
Fig. 1 is the structural representation of lifting machine hydraulic control system.
In figure: 1-fuel tank, 2-Hydraulic Pump, 3-pilot overflow valve, 4-first change-over valve, 5-first by pass valve, 6-second by pass valve, 7-second change-over valve, 8-one-way throttle valve, 9-the 3rd change-over valve, 10-hydraulic actuating cylinder, 11-travel switch, 12-check valve.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of lifting machine hydraulic control system, comprise fuel tank 1, Hydraulic Pump 2, check valve 12 and hydraulic actuating cylinder 10, the oil inlet of described Hydraulic Pump 2 is connected with fuel tank 1, and the oil outlet pipe of described Hydraulic Pump 2 is connected with check valve 12 and pilot overflow valve 3; Described check valve 12 is connected with the P mouth of the second change-over valve 7, the A mouth of described second change-over valve 7 is connected with rod chamber one end of hydraulic actuating cylinder 10 by the 3rd change-over valve 9, and the B mouth of described second change-over valve 7 is connected with rodless cavity one end of hydraulic actuating cylinder 10 by one-way throttle valve 8; Pipeline between described one-way throttle valve 8 and hydraulic actuating cylinder 10 is also provided with a differential branch road, the described differential branch road other end is connected to the 3rd change-over valve 9; The control port of the pilot stage of described pilot overflow valve 3 is connected with the P mouth of the first change-over valve 4, and the A mouth of described first change-over valve 4 is connected with the first by pass valve 5, and the B mouth of described first change-over valve 4 is connected with the second by pass valve 6; The T mouth of described first change-over valve 4 and the second change-over valve 7 is connected with fuel tank, and the return opening of described pilot overflow valve 3, first by pass valve 5 and the second by pass valve 6 is connected with fuel tank.
Principle of work of the present utility model is:
Composition graphs 1, lifting work is entered: hydraulic oil sucks from fuel tank 1 and is pressed in hydraulic efficiency pressure system by Hydraulic Pump 2, P mouth through the second change-over valve 7 enters the second change-over valve 7, hold the electric hydraulic oil that makes is flowed out by the B mouth of the second change-over valve 7 by the Y1 controlling the second change-over valve 7, in the rodless cavity that one-way throttle valve 8 enters hydraulic actuating cylinder 10, thus hydraulic actuating cylinder 10 is stretched out, in hydraulic actuating cylinder 10 rod chamber, hydraulic oil gets back to fuel tank 1 through the 3rd change-over valve 9.
Lifting F.F.: enter with lifting work, difference makes the Y5 of the 3rd change-over valve 9 hold electric, thus make the hydraulic oil of hydraulic actuating cylinder 10 rod chamber add in rodless cavity, forms differential circuit, thus make hydraulic actuating cylinder 10 F.F..
Decline: hydraulic oil sucks from fuel tank 1 and is pressed in hydraulic efficiency pressure system by Hydraulic Pump 2, P mouth through the second change-over valve 7 enters the second change-over valve 7, hold the electric hydraulic oil that makes is flowed out by the A mouth of the second change-over valve 7 by the Y2 controlling the second change-over valve 7, hydraulic actuating cylinder 10 rod chamber is entered through the 3rd change-over valve 9, hydraulic actuating cylinder 10 is retracted, and the hydraulic oil in hydraulic actuating cylinder 10 rodless cavity enters the B mouth of the second change-over valve 7 and then enters fuel tank 1 after one-way throttle valve 8.
Described one-way throttle valve 8 only plays throttling governing effect when lifting machine declines, and is convenient to lifting machine and stablizes descending at slow speed.
When the first change-over valve 4 must not electricity time, system pressure is the setting pressure of pilot overflow valve 3; When the Y3 of the first change-over valve 4 holds electric, system pressure is the setting pressure of the second by pass valve 6; When the Y4 of the first change-over valve 4 holds electric, system pressure is the setting pressure of the first by pass valve 5, and the setting value of above-mentioned first by pass valve 5 and the second by pass valve 6 is all less than the setting value of pilot overflow valve 3.Meet the different pressure demand of lifting machine by the multistage adjustment of system pressure, strengthen practicality.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification sheets is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of specification sheets is only for clarity sake, those skilled in the art should by specification sheets integrally, and the technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
Claims (5)
1. a lifting machine hydraulic control system, comprises fuel tank, Hydraulic Pump, check valve and hydraulic actuating cylinder, it is characterized in that, the oil inlet of described Hydraulic Pump is connected with fuel tank, and the oil outlet pipe of described Hydraulic Pump is connected with check valve and pilot overflow valve; Described check valve is connected with the P mouth of the second change-over valve, and the A mouth of described second change-over valve is connected with rod chamber one end of hydraulic actuating cylinder by the 3rd change-over valve, and the B mouth of described second change-over valve is connected with rodless cavity one end of hydraulic actuating cylinder by one-way throttle valve; Pipeline between described one-way throttle valve and hydraulic actuating cylinder is also provided with a branch road, the described branch road other end is connected to the 3rd change-over valve; The travel path of described hydraulic actuating cylinder is provided with travel switch; The control port of the pilot stage of described pilot overflow valve is connected with the P mouth of the first change-over valve, and the A mouth of described first change-over valve is connected with the first by pass valve, and the B mouth of described first change-over valve is connected with the second by pass valve; The T mouth of described first change-over valve and the second change-over valve is connected with fuel tank, and the return opening of described pilot overflow valve, the first by pass valve and the second by pass valve is connected with fuel tank.
2. lifting machine hydraulic control system according to claim 1, is characterized in that, described Hydraulic Pump is gear type pump.
3. lifting machine hydraulic control system according to claim 1, is characterized in that, described first by pass valve and the second by pass valve are direct-acting overflow valve, and the setting value of the first by pass valve and the second by pass valve is less than the setting value of pilot overflow valve.
4. lifting machine hydraulic control system according to claim 1, is characterized in that, described first change-over valve and the second change-over valve are three-position four-way electromagnetic directional valve, and Median Function is O shape.
5. lifting machine hydraulic control system according to claim 1, is characterized in that, described 3rd change-over valve is two position three way directional control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570874.0U CN204873719U (en) | 2015-07-31 | 2015-07-31 | Quick -witted hydraulic control system lifts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570874.0U CN204873719U (en) | 2015-07-31 | 2015-07-31 | Quick -witted hydraulic control system lifts |
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| Publication Number | Publication Date |
|---|---|
| CN204873719U true CN204873719U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520570874.0U Expired - Fee Related CN204873719U (en) | 2015-07-31 | 2015-07-31 | Quick -witted hydraulic control system lifts |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483871A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Hot press unit of silk winding and strip forming production device |
| CN107620744A (en) * | 2017-09-22 | 2018-01-23 | 凯迈（洛阳）测控有限公司 | Bomb truck lifting mechanism lifting force adaptive control system and control method |
| CN108708889A (en) * | 2018-07-23 | 2018-10-26 | 武汉理工大学 | A kind of energy-saving low fast-response mixing control servo-hydraulic machine hydraulic system that shakes |
-
2015
- 2015-07-31 CN CN201520570874.0U patent/CN204873719U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483871A (en) * | 2016-01-26 | 2016-04-13 | 湖州南浔中兴丝织有限公司 | Hot press unit of silk winding and strip forming production device |
| CN105483871B (en) * | 2016-01-26 | 2017-11-24 | 湖州南浔中兴丝织有限公司 | Silk is around the heat-pressure unit for being rolled into bar process units |
| CN107620744A (en) * | 2017-09-22 | 2018-01-23 | 凯迈（洛阳）测控有限公司 | Bomb truck lifting mechanism lifting force adaptive control system and control method |
| CN108708889A (en) * | 2018-07-23 | 2018-10-26 | 武汉理工大学 | A kind of energy-saving low fast-response mixing control servo-hydraulic machine hydraulic system that shakes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20160731 |