CN103787199A - Hydraulic system of automobile crane hoisting mechanism - Google Patents
Hydraulic system of automobile crane hoisting mechanism Download PDFInfo
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- CN103787199A CN103787199A CN201210435131.3A CN201210435131A CN103787199A CN 103787199 A CN103787199 A CN 103787199A CN 201210435131 A CN201210435131 A CN 201210435131A CN 103787199 A CN103787199 A CN 103787199A
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Abstract
The invention discloses a hydraulic system of an automobile crane hoisting mechanism. The hydraulic system of the automobile crane hoisting mechanism comprises a hydraulic pump and a lifting motor, wherein an oil outlet of the hydraulic pump is communicated with a T opening of a first reversing valve; an R opening of the first reversing valve is communicated with an A opening of the lifting motor; a B opening of the lifting motor is communicated with an S opening of the first reversing valve; a P opening of the first reversing valve is communicated with an oil storage tank; a shuttle valve and a balance valve are connected between the R opening of the first reversing valve and the S opening of the first reversing valve in parallel; an outlet of the shuttle valve is communicated with an N opening of a second reversing valve; a Q opening of the second reversing valve is communicated with the oil storage tank; an M opening of the second reversing valve is communicated with a rodless cavity of a braking hydraulic cylinder; a rod cavity of the braking hydraulic cylinder is communicated with the oil storage tank; and the braking hydraulic cylinder is connected with the lifting motor through a control oil path. The hydraulic system of the automobile crane hoisting mechanism has the advantages of being stable in loading operating speed, reasonable in design, simple in structure, stable in operation, long in service life, obvious in cost advantage, and convenient to popularize and use.
Description
Technical field
The invention belongs to elevator machinery technical field, relate to a kind of hydraulic efficiency pressure system, be specifically related to a kind of Hydraulic system with hoisting Mechanism in Truck Cranes.
Background technology
At present, domestic 8 tons and following little tonnage car hosit because its cost is low, volume is little, lightweight, require the factor such as low to play an increasingly important role in the capital construction of town and country to road environment, the market demand significantly improves year by year.The hydraulic efficiency pressure system of external lifting mechanism adopts enclosed variable system more, in enclosed variable system, the obstructed fuel tank of the oil return of lifting motor directly flows to the oil inlet port of Hydraulic Pump, within the scope that simultaneity factor can regulate at volume adjustable hydraulic pump, give full play to the horsepower output of driving engine, reduce the unnecessary power dissipation of driving engine, but adopt enclosed variable system comparatively complicated in the time of design, manufacture process requirement and the cost of volume adjustable hydraulic pump are all higher simultaneously.The job requirement of the hydraulic efficiency pressure system of little tonnage car hosit is not high, does not need so complicated design.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art, a kind of Hydraulic system with hoisting Mechanism in Truck Cranes is provided, its load running velocity-stabilization, reasonable in design, simple in structure, stable, long service life, cost advantage is obvious, is convenient to promote the use of.
For achieving the above object, the technical solution used in the present invention is: a kind of Hydraulic system with hoisting Mechanism in Truck Cranes, comprise Hydraulic Pump and lifting motor, it is characterized in that: described Hydraulic Pump oil outlet is communicated with change-over valve one T mouth, described change-over valve one R mouth is communicated with lifting motor A mouth, described lifting motor B mouth is communicated with change-over valve one S mouth, described change-over valve one P mouth is communicated with petrol storage tank, between described change-over valve one R mouth and S mouth, be parallel with shuttle valve and balance cock, described shuttle valve outlet is communicated with change-over valve two N mouths, described change-over valve two Q mouths are communicated with petrol storage tank, described change-over valve two M mouths are communicated with braking liquid cylinder pressure rodless cavity, described braking liquid cylinder pressure rod chamber is communicated with petrol storage tank, described braking liquid cylinder pressure is connected by oil circuit control with lifting motor.
Above-mentioned Hydraulic system with hoisting Mechanism in Truck Cranes, is characterized in that: between described change-over valve two M mouths and braking liquid cylinder pressure rodless cavity, be provided with one-way damper valve.
Above-mentioned Hydraulic system with hoisting Mechanism in Truck Cranes, is characterized in that: described change-over valve one is three position four-way directional control valve, and described change-over valve two is two-bit triplet change-over valve.
Above-mentioned Hydraulic system with hoisting Mechanism in Truck Cranes, is characterized in that: described Hydraulic Pump oil outlet place is provided with by pass valve.
Above-mentioned Hydraulic system with hoisting Mechanism in Truck Cranes, is characterized in that: between described change-over valve one P mouth and petrol storage tank, be provided with check valve.
The present invention compared with prior art has the following advantages:
(1) this Hydraulic system with hoisting Mechanism in Truck Cranes adopts open type quantitative system, and quantitative hydraulic POF is constant, thereby load running velocity-stabilization.
(2) this Hydraulic system with hoisting Mechanism in Truck Cranes is reasonable in design, and structure is very simple.
(3) this Hydraulic system with hoisting Mechanism in Truck Cranes is stable, long service life.
(4) this Hydraulic system with hoisting Mechanism in Truck Cranes adopts open type quantitative system, thereby it is simple in structure, has obvious cost advantage, thereby be convenient to promote the use of compared with enclosed variable system.
Below by drawings and Examples, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is hydraulic control principle schematic of the present invention.
Description of reference numerals:
1-Hydraulic Pump; 2-change-over valve one; 3-by pass valve;
4-shuttle valve; 5-balance cock; 6-lifting motor;
7-braking liquid cylinder pressure; 8-one-way damper valve; 9-change-over valve two;
10-; 11-petrol storage tank.
The specific embodiment
A kind of Hydraulic system with hoisting Mechanism in Truck Cranes as shown in Figure 1, comprise Hydraulic Pump 1 and lifting motor 6, described Hydraulic Pump 1 oil outlet is communicated with the T mouth of change-over valve 1, the R mouth of described change-over valve 1 is communicated with the A mouth of lifting motor 6, the B mouth of described lifting motor 6 is communicated with the S mouth of change-over valve 1, the P mouth of described change-over valve 1 is communicated with petrol storage tank 11, between the R mouth of described change-over valve 1 and S mouth, be parallel with shuttle valve 4 and balance cock 5, described shuttle valve 4 outlets are communicated with the N mouth of change-over valve 29, the Q mouth of described change-over valve 29 is communicated with petrol storage tank 11, the M mouth of described change-over valve 29 is communicated with braking liquid cylinder pressure 7 rodless cavities, described braking liquid cylinder pressure 7 rod chambers are communicated with petrol storage tank 11, described braking liquid cylinder pressure 7 is connected by oil circuit control with lifting motor 6.
As shown in Figure 1, between the M mouth of described change-over valve 29 and braking liquid cylinder pressure 7 rodless cavities, be provided with one-way damper valve 8.
As shown in Figure 1, described change-over valve 1 is three position four-way directional control valve, and described change-over valve 29 is two-bit triplet change-over valve.
As shown in Figure 1, described Hydraulic Pump 1 oil outlet place is provided with by pass valve 3.
As shown in Figure 1, between the P mouth of described change-over valve 1 and petrol storage tank 11, be provided with check valve 10.
The working process of Hydraulic system with hoisting Mechanism in Truck Cranes of the present invention is: in the time that change-over valve 1 is placed in left position, a Hydraulic Pump 1 hydraulic oil part out enters into braking liquid cylinder pressure 7 through shuttle valve 4, change-over valve 29 and one-way damper valve 8, and drg is unlocked.Another part enters the A mouth of lifting motor 6 after the check valve through in balance cock 5, and device to be braked is back to petrol storage tank 11 by change-over valve 1 after opening again, and load weight is hoisted.In the time that change-over valve 1 is placed in right position, hydraulic oil is opened drg on the one hand, enter on the other hand the right side hydraulic fluid port of lifting motor 6, device to be braked is back to petrol storage tank 11 by throttle chink and the change-over valve 1 of balance cock 5 after opening again, and load weight speed limit under the effect of balance cock 5 declines.
When change-over valve 29 is placed in when the next, the spring of braking liquid cylinder pressure 7 resets under the effect of predetermincd tension, the state of drg in brake sticking brake.The individual event dash pot valve 8 being connected with braking liquid cylinder pressure 7 plays a part to delay drg and opens, when the operating mode that prevents from hoisting is also not enough to reach the required force value of load because of system pressure, drg has been opened and has been caused the load weight segment distance that first glides to hoist again, i.e. double slide phenomenon.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification, change and equivalent structure transformation of above embodiment being done according to the technology of the present invention essence, all still belongs in the protection domain of technical solution of the present invention.
Claims (5)
1. a Hydraulic system with hoisting Mechanism in Truck Cranes, comprise Hydraulic Pump (1) and lifting motor (6), it is characterized in that: described Hydraulic Pump (1) oil outlet is communicated with change-over valve one (2) T mouth, described change-over valve one (2) R mouth is communicated with lifting motor (6) A mouth, described lifting motor (6) B mouth is communicated with change-over valve one (2) S mouth, described change-over valve one (2) P mouth is communicated with petrol storage tank (11), between described change-over valve one (2) R mouth and S mouth, be parallel with shuttle valve (4) and balance cock (5), described shuttle valve (4) outlet is communicated with change-over valve two (9) N mouths, described change-over valve two (9) Q mouths are communicated with petrol storage tank (11), described change-over valve two (9) M mouths are communicated with braking liquid cylinder pressure (7) rodless cavity, described braking liquid cylinder pressure (7) rod chamber is communicated with petrol storage tank (11), described braking liquid cylinder pressure (7) is connected by oil circuit control with lifting motor (6).
2. according to Hydraulic system with hoisting Mechanism in Truck Cranes claimed in claim 1, it is characterized in that: between described change-over valve two (9) M mouths and braking liquid cylinder pressure (7) rodless cavity, be provided with one-way damper valve (8).
3. according to Hydraulic system with hoisting Mechanism in Truck Cranes claimed in claim 1, it is characterized in that: described change-over valve one (2) is three position four-way directional control valve, and described change-over valve two (9) is two-bit triplet change-over valve.
4. according to Hydraulic system with hoisting Mechanism in Truck Cranes claimed in claim 1, it is characterized in that: described Hydraulic Pump (1) oil outlet place is provided with by pass valve (3).
5. according to Hydraulic system with hoisting Mechanism in Truck Cranes claimed in claim 1, it is characterized in that: between described change-over valve one (2) P mouth and petrol storage tank (11), be provided with check valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210435131.3A CN103787199A (en) | 2012-11-04 | 2012-11-04 | Hydraulic system of automobile crane hoisting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210435131.3A CN103787199A (en) | 2012-11-04 | 2012-11-04 | Hydraulic system of automobile crane hoisting mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103787199A true CN103787199A (en) | 2014-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210435131.3A Pending CN103787199A (en) | 2012-11-04 | 2012-11-04 | Hydraulic system of automobile crane hoisting mechanism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104044998A (en) * | 2014-06-06 | 2014-09-17 | 淮南联合大学 | Monorail crane travelling mechanism hydraulic system for double-braking mine |
| CN105398977A (en) * | 2015-12-09 | 2016-03-16 | 贵州枫阳液压有限责任公司 | Tower crane brake unit |
-
2012
- 2012-11-04 CN CN201210435131.3A patent/CN103787199A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104044998A (en) * | 2014-06-06 | 2014-09-17 | 淮南联合大学 | Monorail crane travelling mechanism hydraulic system for double-braking mine |
| CN105398977A (en) * | 2015-12-09 | 2016-03-16 | 贵州枫阳液压有限责任公司 | Tower crane brake unit |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140514 |