CN105114379B - Lifting platform and hydraulic system thereof - Google Patents
Lifting platform and hydraulic system thereof Download PDFInfo
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- CN105114379B CN105114379B CN201510639062.1A CN201510639062A CN105114379B CN 105114379 B CN105114379 B CN 105114379B CN 201510639062 A CN201510639062 A CN 201510639062A CN 105114379 B CN105114379 B CN 105114379B
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- valve
- elevating ram
- check valve
- rodless cavity
- hoistable platform
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- 239000010720 hydraulic oil Substances 0.000 claims abstract description 29
- 230000003028 elevating effect Effects 0.000 claims description 112
- 239000002828 fuel tank Substances 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 33
- 238000012360 testing method Methods 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- MFOUDYKPLGXPGO-UHFFFAOYSA-N propachlor Chemical compound ClCC(=O)N(C(C)C)C1=CC=CC=C1 MFOUDYKPLGXPGO-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention discloses a hydraulic system of a lifting platform. The system comprises a hydraulic pump, an oil tank, a lower lifting oil cylinder, an upper lifting oil cylinder and an overflow valve, wherein a rodless cavity of the lower lifting oil cylinder is communicated with the oil tank through a first two-position two-way electromagnetic valve capable of being opened manually, a rodless cavity of the upper lifting oil cylinder is communicated with the hydraulic pump through a first one-way valve, and the first one-way valve allows hydraulic oil to flow to the rodless cavity of the upper lifting oil cylinder through the hydraulic pump; the overflow valve is connected with the first one-way valve in parallel, and both an inlet of the first one-way valve and an oil drainage port of the overflow valve are communicated with an inlet of the first two-position two-way electromagnetic valve. Due to the fact that the oil drainage port of the overflow valve is connected to an oil inlet circuit of the upper lifting oil cylinder and communicated with an oil outlet circuit of the rodless cavity of the lower lifting oil cylinder, rising and falling of the platform can be achieved as long as the opening pressure of the overflow valve is smaller than the minimum pressure in the upper lifting oil cylinder at the initial position of the platform, and repeated testing for determination is not needed. The invention further discloses a lifting platform comprising the hydraulic system.
Description
Technical field
The present invention relates to hydraulic lifting field, more particularly to a kind of hydraulic system of hoistable platform.Additionally, the present invention is also
It is related to a kind of hoistable platform.
Background technology
Hoistable platform is broad-spectrum work high above the ground special equipment, and it is to promote the flexible of bracing frame by hydraulic jack
The lifting of workbench is realized, so as to reach the purpose of work high above the ground.Particularly scissor-type lifting platform, its scissor machinery knot
Structure, makes hoistable platform raising have higher stability, and roomy job platform and higher bearing capacity makes work high above the ground scope
It is bigger, and it is adapted to many people operation simultaneously, make work high above the ground in hgher efficiency, safety is more ensured, therefore application is more extensive.
To prevent system burst failure or power breakdown from causing workbench to decline in operation process, so as to
Jeopardize human life's safety, so general aerial work platform is all configured with emergent descending system.When system malfunctions,
The staff on ground is only needed to exert oneself the emergent handle of a drawing, bracing frame will automatically shrink decline so as to realize workbench
Decline.
Fig. 1 is refer to, Fig. 1 is a kind of schematic diagram of scissor-type lifting platform hydraulic system of the prior art.It includes
First check valve 101, the second check valve 104, first throttle valve 102, second throttle 106, can manually boot first liang
Two three-way electromagnetic valves 103 of position, the second 2/2-way magnetic valve 107, overflow valve 105, lower elevating ram 108, the and of upper elevating ram 109
Fuel tank 110, overflow valve 105 is in parallel with the second 2/2-way magnetic valve 107, second throttle 106, and the draining of overflow valve 105
Mouth is connected on the going out on oil return line of the rodless cavity of elevating ram 109.When system malfunctions can not be opened, ground staff pulls the
The valve element of one or two two three-way electromagnetic valve 103, all of pressure in the lower inside of elevating ram 108 of release, by the weight of whole workbench
Amount is all carried on overflow valve 105, the spilling so that hydraulic oil in the rodless cavity of upper elevating ram 109 builds the pressure.But this hydraulic pressure
The Opening pressure value of the overflow valve 105 in system needs to debug repeatedly and just can determine that, because if design of pressure is too small, then without
Method forms sufficiently large pressure to realize the lifting of workbench；If design of pressure is excessive, the first 2/2-way is pulled
After magnetic valve 103, building the pressure for being formed in the rodless cavity of upper elevating ram 109 cannot make the overflow of overflow valve 105.And platform is under emergent
The pressure of whole upper elevating ram is into U-shaped curve during drop, therefore the Opening pressure of overflow valve 105 have to be lower than U-shaped song
The minimum of a value of line is also needed more than the maximum during platform raising simultaneously.Lift on when workbench drops to certain altitude
When oil pressure in the rodless cavity of oil cylinder 109 is less than or equal to the Opening pressure of overflow valve 105, overflow valve 105 will be closed, and cause work
Platform can not be brought down completely to position.
Therefore how making the Opening pressure value of overflow valve, not need repetition test be that those skilled in the art are current to determine
The technical issues that need to address.
The content of the invention
It is an object of the invention to provide a kind of hydraulic system of hoistable platform, makes the Opening pressure value of overflow valve easily true
It is fixed.It is a further object of the present invention to provide a kind of hoistable platform, the Opening pressure value for making overflow valve easily determines.
To achieve these goals, the present invention provides a kind of hydraulic system of hoistable platform, including hydraulic pump, fuel tank, under
The rod chamber of elevating ram, upper elevating ram and overflow valve, the rod chamber of the lower elevating ram and the upper elevating ram is equal
Connect with the fuel tank, the rodless cavity of the lower elevating ram connects the hydraulic pump, and the rodless cavity of the lower elevating ram leads to
Cross can be manually opened the first 2/2-way magnetic valve connect with the fuel tank, the rodless cavity of the upper elevating ram is by the
Two 2/2-way magnetic valves connect the fuel tank, and the rodless cavity of the upper elevating ram connects the hydraulic pressure by the first check valve
Pump, first check valve allows hydraulic oil that the rodless cavity of the upper elevating ram is flowed to by the hydraulic pump, also includes and institute
State the first check valve overflow valve in parallel, and the drain tap of the entrance of first check valve, the overflow valve is with described the
The entrance connection of one or two two three-way electromagnetic valve.
Preferably, the rodless cavity of the lower elevating ram is connected by the second check valve with the hydraulic pump, and described second
Check valve allows hydraulic oil that the rodless cavity of the lower elevating ram is flowed into by the hydraulic pump.
Preferably, the rodless cavity of the lower elevating ram is connected by the 3rd check valve with the first 2/2-way magnetic valve
Logical, the 3rd check valve allows hydraulic oil to flow to the first 2/2-way electromagnetism by the rodless cavity of the lower elevating ram
Valve.
Preferably, the hydraulic system also includes the 4th check valve and the 5th check valve, the entrance of the 4th check valve
Connect with the hydraulic pump, the outlet and first 2/2-way of the outlet of the 5th check valve with the 3rd check valve
The entrance connection of magnetic valve, the outlet of the 4th check valve and the entrance of the 5th check valve, first check valve
The drain tap connection of entrance and the overflow valve.
Preferably, the entrance of second check valve is connected with the entrance of the 4th check valve, the lower elevating ram
Rod chamber, the outlet of the first 2/2-way magnetic valve and the outlet of the second 2/2-way magnetic valve with it is described on
The rod chamber connection of elevating ram.
Preferably, the hydraulic system also includes first throttle valve and second throttle, one end of the first throttle valve
With the outlet of the first 2/2-way magnetic valve, the other end of the first throttle valve connects with the fuel tank；It is described
The outlet of one end of second throttle and the second 2/2-way magnetic valve, the other end of the second throttle and institute
State fuel tank connection.
Preferably, second check valve, the 3rd check valve, the 4th check valve, the 5th check valve, institute
First throttle valve and the first 2/2-way magnetic valve integrated installation are stated in the first valve block, it is first check valve, described
Second throttle, the second 2/2-way magnetic valve and the overflow valve integrated installation are in the second valve block.
Preferably, the first valve block is provided with the first oil-in and first interface, and the second valve block is provided with second
Oil-in, the hydraulic pump accesses the first valve block by first oil-in, and the second valve block passes through described first
First valve block described in pipeline communication between interface and second oil-in.
The present invention also provides a kind of hoistable platform, including underframe, bracing frame, workbench, hydraulic system and Electronic control
Mechanism, the hydraulic system is specially the hydraulic system described in above-mentioned any one.
Preferably, the hoistable platform is specially scissor-type lifting platform.
The hydraulic system of the hoistable platform that the present invention is provided, when there is emergency condition, ground handling operator pulls first
The valve element of 2/2-way magnetic valve, lower elevating ram circuit communication is same because weight due to elevating ram retraction under Action of Gravity Field
Masterpiece is increased with pressure in elevating ram, and the hydraulic oil in upper elevating ram rodless cavity builds the pressure spilling, upper elevating ram and under
Elevating ram is retracted simultaneously, and aerial work platform declines.Enter oil return line due to what the drain tap of overflow valve was connected on upper elevating ram
On, and the fuel-displaced circuit communication of the drain tap of overflow valve and lower elevating ram rodless cavity, even if therefore overflow valve Opening pressure
Less than the oil pressure of lifting, overflow valve off-load when being also not result in lifting causes elevating ram to be lifted not, so overflow valve
Opening pressure simply need to be less than minimum pressure during platform original position in upper elevating ram, it is possible to realize the lifting of platform, no
Need repetition test to determine.
The hoistable platform that the present invention is provided includes above-mentioned hydraulic system, because there is above-mentioned hydraulic system above-mentioned technology to imitate
Really, above-mentioned hoistable platform should also have same technique effect, and here is no longer discussed in detail.
Description of the drawings
Fig. 1 is a kind of hydraulic system connection diagram of hoistable platform of the prior art；
Fig. 2 is a kind of hydraulic schematic diagram of specific embodiment of hoistable platform hydraulic system provided by the present invention.
Specific embodiment
The core of the present invention is to provide a kind of hydraulic system of hoistable platform, and the Opening pressure value for making overflow valve is not needed instead
Retrial tests to determine.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 2 is refer to, Fig. 2 is a kind of hydraulic pressure of specific embodiment of hoistable platform hydraulic system provided by the present invention
Schematic diagram.
The hydraulic system of the hoistable platform that the specific embodiment of the invention is provided, including hydraulic pump, fuel tank 209, lower lifting
Oil cylinder 210, upper elevating ram 211 and overflow valve 207, the rod chamber of lower elevating ram 210 and the rod chamber of upper elevating ram 211
Connect with fuel tank 209, the rodless cavity of lower elevating ram 210 is connected with hydraulic pump, the rodless cavity of lower elevating ram 210 passes through energy
The the first 2/2-way magnetic valve 204 for enough manually booting is connected with fuel tank 209, and the rodless cavity of upper elevating ram 211 passes through second
2/2-way magnetic valve 208 connects fuel tank 209, and the rodless cavity of upper elevating ram 211 is connected by the first check valve 206 and hydraulic pump
Logical, the first check valve 206 allows hydraulic oil that the rodless cavity of upper elevating ram 211 is flowed to by hydraulic pump, and overflow valve 207 and first is single
It is in parallel to valve 206, and the drain tap of the entrance of the first check valve 206, overflow valve 207 with the first 2/2-way magnetic valve 204
Entrance connection.
The rodless cavity of upper elevating ram 211 is connected by the first check valve 206 with hydraulic pump, and the first check valve 206 is allowed
Hydraulic oil by the upper elevating ram 211 of hydraulic pump flow direction rodless cavity, i.e. the entrance connection hydraulic pump of the first check valve 206, first
The rodless cavity of the upper elevating ram 211 of outlet connection of check valve 206；Overflow valve 207 is in parallel with the first check valve 206, and first
The entrance of check valve 206, the drain tap of overflow valve 207 are connected with the entrance of the first 2/2-way magnetic valve 204, i.e. overflow valve
207 are connected in parallel on the entering on oil return line of elevating ram, the first check valve 206 to the pipeline between hydraulic pump and lower elevating ram
210 rodless cavities are to the pipeline connection between the first 2/2-way magnetic valve 204 so that the liquid in the upper rodless cavity of elevating ram 211
Force feed can be flowed out by overflow valve 207, the first 2/2-way magnetic valve 204, and ensure that will not be because of overflow valve during lifting
207 off-loads cause elevating ram 211 can not lifted.
When system malfunctions or electricity exhaust hoistable platform can not normally be declined, ground handling operator pulls first
The valve element of 2/2-way magnetic valve 204, the lower circuit communication of elevating ram 210 discharges all of pressure in the inside of lower elevating ram 210
Power, because elevating ram 210 bounces back under Action of Gravity Field, the rod chamber oil suction of lower elevating ram 210, rodless cavity fluid passes through first
2/2-way magnetic valve 204 flows out；Now the weight of whole platform upper point is all carried on elevating ram 211, upper act
Pressure increase in the rodless cavity of oil-lifting jar 211, because the second two 2/2-way magnetic valves 208 are not opened, forms normally closed, upper act
Hydraulic oil in the rodless cavity of oil-lifting jar 211 builds the pressure, and forces the valve port of overflow valve 207 to be opened, and hydraulic oil passes through overflow valve the 207, the 5th
Check valve 205 flows out eventually through the first 2/2-way magnetic valve 204, and upper elevating ram 211 and lower elevating ram 210 contract simultaneously
Return, so as to aerial work platform decline.Because the drain tap of overflow valve 207 is connected on the entering on oil return line of upper elevating ram 211, and
The fuel-displaced circuit communication of the drain tap of overflow valve 207 and the lower rodless cavity of elevating ram 210, even if therefore overflow valve 207 unlatching
Less than the oil pressure of lifting, the off-load of overflow valve 207 when being also not result in lifting causes elevating ram 211 can not lifted to pressure, institute
Be not required to repetition test to determine with the Opening pressure value of overflow valve 207, when simply need to be less than job platform original position on lifting oil
Minimum pressure values in cylinder 211.
In the hydraulic system of the hoistable platform that the specific embodiment of the invention is provided, the rodless cavity of lower elevating ram 210
Can be connected with hydraulic pump by the second check valve 201, the second check valve 201 allows hydraulic oil to flow into lower lifting oil by hydraulic pump
The rodless cavity of cylinder 210, the i.e. entrance of the second check valve 201 is connected with hydraulic pump, and the outlet of the second check valve 201 and lower lifting are oily
The rodless cavity of cylinder 210 is connected；The rodless cavity of lower elevating ram 210 can be by the 3rd check valve 202 and the first 2/2-way electricity
Magnet valve 204 is connected, and the 3rd check valve 202 allows hydraulic oil to flow to the first 2/2-way electricity by the rodless cavity of lower elevating ram 210
Magnet valve 204.
The hydraulic system of the hoistable platform that the specific embodiment of the invention is provided can also include the 4th check valve 203 and the
Five check valves 205, the entrance of the 4th check valve 203 is connected with hydraulic pump, outlet and the 3rd check valve of the 5th check valve 205
The entrance connection of 202 outlet and the first 2/2-way magnetic valve 204, outlet and the 5th check valve 205 of the 4th check valve 203
Entrance, the entrance of the first check valve 206, overflow valve 207 drain tap connection.
So when hoistable platform rises, by hydraulic pump power is provided, the second check valve 201 make hydraulic oil can only unidirectionally by
The rodless cavity of the lower elevating ram 210 of hydraulic pump flow direction, the 4th check valve 203 makes hydraulic oil unidirectionally can only flow to act by hydraulic pump
The rodless cavity of oil-lifting jar 211, the second check valve 201 and the 4th check valve 203 can prevent hydraulic oil to be back to hydraulic pump, prevent
Because the unexpected rising of system pressure damages hydraulic pump；When hoistable platform declines, lower elevating ram 210 and upper elevating ram 211
Retraction, hydraulic oil in the lower rodless cavity of elevating ram 210 and the rodless cavity of upper elevating ram 211 flows out, the second check valve 201 and the
Four check valves 203 prevent hydraulic oil to be back to hydraulic pump, and the 5th check valve 205 ensures the liquid in the lower rodless cavity of elevating ram 210
Force feed can only flow into fuel tank 209 by the 3rd check valve 202, the first 2/2-way magnetic valve 204；In the emergent decline of hoistable platform
When, the second 2/2-way magnetic valve 208 is closed, the first check valve 206, the 3rd check valve 202, the 4th check valve 203 and the 5th
Check valve 205 ensures that the hydraulic oil in the upper rodless cavity of elevating ram 211 can only pass sequentially through overflow valve 207, the 5th check valve 205
Fuel tank 209 is flowed into eventually through the first 2/2-way magnetic valve 204.
In the hydraulic system of the hoistable platform that the specific embodiment of the invention is provided, can be by the second check valve 201
Entrance is connected with the entrance of the 4th check valve 203, is formed a pipeline and is accessed hydraulic pump again；Can also be by lower elevating ram 210
Rod chamber, the outlet of the first 2/2-way magnetic valve 204, the outlet of the second 2/2-way magnetic valve 208 and upper elevating ram
211 rod chamber connection, forms a pipeline and accesses fuel tank again.So whole hydraulic system only needs a hydraulic pump and an oil
Case, can also effectively shorten pipeline, cost-effective.
On the basis of above-mentioned each specific embodiment, the hydraulic pressure system of the hoistable platform that the specific embodiment of the invention is provided
System can also include first throttle valve 213 and second throttle 214, one end of first throttle valve 213 and the first 2/2-way electricity
The outlet of magnet valve 204, the other end of first throttle valve 213 is connected with fuel tank 209；One end of second throttle 214 and the
The outlet of two 2/2-way magnetic valves 208, the other end of second throttle 214 is connected with fuel tank 209.I.e. in lower lifting oil
Go out on oil return line to connect respectively first throttle valve 213 and the second throttle 214 of cylinder 210 and upper elevating ram 211, choke valve can
To control the flow of hydraulic oil, by adjusting choke valve decline process can be made more steady when hoistable platform declines.
In the hydraulic system of the hoistable platform that the specific embodiment of the invention is provided, fluid pressure line is more, in order that liquid
The overall structure of pressure pipe road connection is simply compact, reduces manufacturing cost, improves precision and reliability, facilitates I＆M, can
With the second check valve 201, the 3rd check valve 202, the 4th check valve 203, the 5th check valve 205, first throttle valve 213 and
One or two two three-way electromagnetic valve 204 is integrated in the first valve block 21, the first check valve 206, second throttle 214, the second two
Two three-way electromagnetic valves 208 and overflow valve 207 are integrated in the second valve block 22.First valve block 21 descends lifting valve block, the second valve block 22
Go up lifting valve block.
On the basis of above-mentioned specific embodiment, pipeline or each parts between each valve block in hydraulic system for convenience
Connection, simplifies the design of hydraulic system and installs, as shown in Fig. 2 can be arranging the on the correct position of the first valve block 21
One oil-in E1 and first interface D1, arranges the second oil-in E2 on the correct position of the second valve block 22, and hydraulic pump is by the
One oil-in E1 accesses the first valve block 21, and the second valve block 22 is by the pipeline communication between first interface D1 and the second oil-in E2
First valve block 21.
It can in addition contain arrange second interface A1, the 3rd interface B1 and the 4th interface on the correct position of the first valve block 21
C1, arranges the 5th interface A2, the 6th interface B2 and the 7th interface C2 on the correct position of the second valve block 22.Lower elevating ram
210 rodless cavity accesses the first valve block 21 by second interface A1, and the rod chamber of lower elevating ram 210 is connect by the 3rd interface B1
Enter the first valve block 21, fuel tank 209 accesses the first valve block 21 by the 4th interface C1；The rodless cavity of upper elevating ram 211 is by the
Five interface A2 access the second valve block 22, and the rod chamber of upper elevating ram 211 accesses the second valve block 22, fuel tank by the 6th interface B2
209 access the second valve block 22 by the 7th interface C2.
In order to be better understood from the hydraulic pressure with the hoistable platform and hoistable platform for implementing specific embodiment of the invention offer
System, with reference to Fig. 2, the work of hoistable platform and its hydraulic system that the concrete general introduction specific embodiment of the invention is provided
Flow process：
Wherein hoistable platform is typically made up of underframe, bracing frame, workbench, hydraulic system and electric control mechanism, is led to
The flexible lifting for realizing workbench that hydraulic jack promotes bracing frame is crossed, so as to reach the purpose of work high above the ground.
When hoistable platform rises, hydraulic pump, the first 2/2-way magnetic valve 204 and the second 2/2-way magnetic valve are opened
208 valve ports are kept closed, and hydraulic oil is entered in the first valve block 21 by E1 oil-ins of the hydraulic pump from the first valve block 21,
Two-way is then divided into, the second check valve 201 is led up to and is flowed out from A1 mouths, then flow into the rodless cavity of lower elevating ram 210；Separately
Lead up to D1 mouth of the check valve 203 from the first valve block 21 to flow out, subsequently into the E2 mouths on the second valve block 22, then by the
One check valve 206 exits into the rodless cavity of upper elevating ram 211 from A2 mouths.Lower elevating ram 210 and upper elevating ram 211 are same
When stretch out promotion bracing frame open, so as to realize the rising of workbench.
When hoistable platform normally declines, the first 2/2-way magnetic valve 204 and the second 2/2-way magnetic valve 208 are obtained simultaneously
Electricity, valve element is opened, and elevating ram 211 and lower elevating ram 210 bounce back on the gravity compressed of workbench and scissor yoke, cause
The rodless cavity oil extraction of oil cylinder, rod chamber oil suction.Hydraulic oil enters the first valve block 21 from fuel tank 209 by C1 mouths, then by B1 mouths
Exit into the rod chamber of lower elevating ram 210；Equally, hydraulic oil enters the second valve block 22 from fuel tank 209 by C2 mouths, then leads to
Cross the rod chamber that B2 mouths exit into elevating ram 211.Hydraulic oil in the lower rodless cavity of elevating ram 210 is entered by A1 mouths
First valve block 21, then the 3rd check valve 202, the first 2/2-way magnetic valve 204 and first throttle valve 213 are passed sequentially through from C1 mouths
Flow out, flow into fuel tank 209；Equally, the hydraulic oil in the rodless cavity of upper elevating ram 211 enters the second valve block 22 by A2 mouths, then
Pass sequentially through the second 2/2-way magnetic valve 208 and second throttle 214 to flow out from C2 mouths, flow into fuel tank 209, lower elevating ram
210 and upper elevating ram 211 retract simultaneously, bracing frame closure is promoted, so as to realize the decline of workbench.
When hoistable platform break down or have a power failure cause hoistable platform to decline when, operating personnel pull manually first liang
The valve element of two three-way electromagnetic valves 204 of position, the lower circuit communication of elevating ram 210 discharges all of pressure in the inside of lower elevating ram 210
Power, because elevating ram 210 bounces back under Action of Gravity Field, the rod chamber oil suction of lower elevating ram 210, the nothing of lower elevating ram 210
Hydraulic oil passes sequentially through the 3rd check valve 202, the first 2/2-way magnetic valve 204 and first throttle valve 213 and flows out in rod cavity, stream
Enter fuel tank 209；Now the weight of whole platform upper point is all carried on elevating ram 211, the nothing of upper elevating ram 211
Bar cavity pressure increases, because the second two 2/2-way magnetic valves 208 are not opened, the liquid in the rodless cavity of upper elevating ram 211
Force feed builds the pressure, and forces the valve port of overflow valve 207 to be opened, and hydraulic oil flows out the second valve block 22, Ran Houcong by overflow valve 207 from E2 mouths
D1 mouths enter the first valve block 21, then pass sequentially through the 5th check valve 205, the first 2/2-way magnetic valve 204 and first throttle valve
213 flow out from C1 mouths, flow into fuel tank 209, and upper elevating ram 211 and lower elevating ram 210 are retracted simultaneously, so as to work high above the ground is flat
Platform declines.
Except the hydraulic system of above-mentioned hoistable platform, the specific embodiment of the present invention also provides a kind of including above-mentioned hydraulic pressure
The hoistable platform of system, structure such as underframe, bracing frame, workbench, the electric control system of the hoistable platform other each several parts
Etc. refer to prior art, repeat no more herein.
Specifically, above-mentioned hoistable platform can be scissor-type lifting platform.
Hoistable platform provided by the present invention and its hydraulic system are described in detail above.Tool used herein
Body example is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help and understands this
Bright method and its core concept.It should be pointed out that for those skilled in the art, without departing from the present invention
On the premise of principle, some improvement and modification can also be carried out to the present invention, these are improved and modification also falls into right of the present invention
In the protection domain of requirement.
Claims (10)
1. a kind of hydraulic system of hoistable platform, including hydraulic pump, fuel tank (209), lower elevating ram (210), upper elevating ram
(211) and overflow valve (207), the rod chamber of the lower elevating ram (210) and the rod chamber of the upper elevating ram (211) are equal
Connect with the fuel tank (209), the rodless cavity of the lower elevating ram (210) connects the hydraulic pump, the lower elevating ram
(210) rodless cavity is connected by the first 2/2-way magnetic valve (204) that can be manually opened with the fuel tank (209), institute
The rodless cavity for stating elevating ram (211) connects the fuel tank (209), its feature by the second 2/2-way magnetic valve (208)
It is that the rodless cavity of the upper elevating ram (211) connects the hydraulic pump by the first check valve (206), and described first is single
Allow hydraulic oil that the rodless cavity of the upper elevating ram (211) is flowed to by the hydraulic pump to valve (206), also include and described the
One check valve (206) overflow valve (207) in parallel, and the entrance of first check valve (206), the overflow valve (207)
Drain tap is connected with the entrance of the first 2/2-way magnetic valve (204).
2. the hydraulic system of hoistable platform according to claim 1, it is characterised in that the lower elevating ram (210)
Rodless cavity is connected by the second check valve (201) with the hydraulic pump, and second check valve (201) allows hydraulic oil by described
Hydraulic pump flows into the rodless cavity of the lower elevating ram (210).
3. the hydraulic system of hoistable platform according to claim 2, the rodless cavity of the lower elevating ram (210) is by the
Three check valves (202) are connected with the first 2/2-way magnetic valve (204), and the 3rd check valve (202) allows hydraulic oil
The first 2/2-way magnetic valve (204) is flowed to by the rodless cavity of the lower elevating ram (210).
4. the hydraulic system of hoistable platform according to claim 3, it is characterised in that the hydraulic system also includes the 4th
Check valve (203) and the 5th check valve (205), the entrance of the 4th check valve (203) is connected with the hydraulic pump, and described
The outlet of the outlet of five check valves (205) and the 3rd check valve (202) and the first 2/2-way magnetic valve (204)
Entrance is connected, entrance, first check valve of the outlet of the 4th check valve (203) with the 5th check valve (205)
(206) the drain tap connection of entrance and the overflow valve (207).
5. the hydraulic system of hoistable platform according to claim 4, it is characterised in that second check valve (201)
Entrance is connected with the entrance of the 4th check valve (203), the rod chamber of the lower elevating ram (210), described the first two
The outlet of two three-way electromagnetic valves (204) and the outlet of the second 2/2-way magnetic valve (208) with the upper elevating ram
(211) rod chamber connection.
6. the hydraulic system of hoistable platform according to claim 5, it is characterised in that the hydraulic system also includes first
Choke valve (213) and second throttle (214), one end and the first 2/2-way electromagnetism of the first throttle valve (213)
The outlet of valve (204), the other end of the first throttle valve (213) is connected with the fuel tank (209)；Second throttling
The outlet of one end of valve (214) and the second 2/2-way magnetic valve (208), the second throttle (214) it is another
One end connects with the fuel tank (209).
7. the hydraulic system of hoistable platform according to claim 6, it is characterised in that second check valve (201), institute
State the 3rd check valve (202), the 4th check valve (203), the 5th check valve (205), the first throttle valve (213)
With the first 2/2-way magnetic valve (204) integrated installation in the first valve block (21), first check valve (206), institute
Second throttle (214), the second 2/2-way magnetic valve (208) and the overflow valve (207) integrated installation are stated in second
In valve block (22).
8. the hydraulic system of hoistable platform according to claim 7, it is characterised in that the first valve block (21) is provided with
First oil-in (E1) and first interface (D1), the second valve block (22) is provided with the second oil-in (E2), the hydraulic pump
The first valve block (21) is accessed by first oil-in (E1), the second valve block (22) is by the first interface
(E1) with the first valve block (21) described in the pipeline communication between second oil-in (E2).
9. a kind of hoistable platform, including underframe, bracing frame, workbench, hydraulic system and electric control mechanism, its feature exists
In the hydraulic system is the hoistable platform hydraulic system described in claim 1 to 8 any one.
10. hoistable platform according to claim 9, it is characterised in that the hoistable platform is specially scissors type elevating and puts down
Platform.
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| CN201510639062.1A CN105114379B (en) | 2015-09-30 | 2015-09-30 | Lifting platform and hydraulic system thereof |
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| CN112357850B (en) * | 2020-09-01 | 2022-08-23 | 山东华龙农业装备股份有限公司 | Lifting mechanism of electric scissor maintenance operation device |
| CN113417904B (en) * | 2021-07-15 | 2024-02-27 | 福建庄金科技有限公司 | Multi-diagonal bracing hydraulic balance control method for pile machine |
| CN114352590A (en) * | 2022-01-13 | 2022-04-15 | 四川鼎鸿智电装备科技有限公司 | Double-cylinder hydraulic mechanism and pressure equipment |
| CN114483718B (en) * | 2022-04-15 | 2022-07-12 | 临工集团济南重机有限公司 | Load weighing method for aerial work platform and aerial work platform |
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| CN203474395U (en) * | 2013-08-06 | 2014-03-12 | 湖南星邦重工有限公司 | Scissor-type high-altitude working vehicle walking hydraulic system |
| CN103693592B (en) * | 2013-08-06 | 2015-09-30 | 湖南星邦重工有限公司 | A kind of scissor-type aerial platform vibration hydraulic system |
| CN203476862U (en) * | 2013-08-06 | 2014-03-12 | 湖南星邦重工有限公司 | Scissor-type high-altitude working vehicle platform rising and falling movement hydraulic system |
| CN103438037B (en) * | 2013-08-06 | 2016-03-23 | 湖南星邦重工有限公司 | A kind of scissors type altitude job platform lifting and down maneuver hydraulic system |
| CN203946859U (en) * | 2014-05-28 | 2014-11-19 | 湖南星邦重工有限公司 | A kind of lifting of scissor-type altitude job platform and down maneuver hydraulic efficiency pressure system |
| CN104098055B (en) * | 2014-05-28 | 2016-04-20 | 湖南星邦重工有限公司 | A kind of lifting of scissor-type altitude job platform and down maneuver hydraulic efficiency pressure system |
| CN205047554U (en) * | 2015-09-30 | 2016-02-24 | 湖南星邦重工有限公司 | Lift platform and hydraulic system thereof |
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