CN208885660U - Hydraulic control circuit for milling machine tail-gate - Google Patents
Hydraulic control circuit for milling machine tail-gate Download PDFInfo
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- CN208885660U CN208885660U CN201821689884.6U CN201821689884U CN208885660U CN 208885660 U CN208885660 U CN 208885660U CN 201821689884 U CN201821689884 U CN 201821689884U CN 208885660 U CN208885660 U CN 208885660U
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Abstract
The utility model proposes a kind of hydraulic control circuits for milling machine tail-gate, comprising: constant pressure oil source, pressure-control valve are connected on the main oil inlet passage of constant pressure oil source；Main reversing valve is located on main oil inlet passage, is connected to after pressure-control valve；Tail-gate oil cylinder connects milling machine tail-gate, passes through floating up and down for the extension and contraction control tail-gate of tail-gate oil cylinder；First control channel and the second control channel, connect with main reversing valve；When main reversing valve is in the first operating position, the oil liquid of the rod chamber and rodless cavity that enter tail-gate oil cylinder by the control of the first control channel realizes the control that floats up and down of tail-gate；When main reversing valve is in the second operating position, the oil liquid of the rod chamber and rodless cavity that enter tail-gate oil cylinder by the control of the second control channel realizes the control that floats up and down of tail-gate.The circuit is able to achieve tail-gate and rises and tail-gate decline function, reduction running resistance, raising working efficiency.
Description
Technical field
The utility model belongs to pavement maintenance machinery and its applied technical field, more particularly to a kind of for milling machine tail-gate
Hydraulic control circuit.
Background technique
In order to adapt to flourishing for road maintenance cause, also variation with rapid changepl. never-ending changes and improvements is occurring for Maintenance Machinery.Milling
Key equipment of the machine as road maintenance machinery industry, its state of development are directly related to the construction quality and effect of road maintenance
Rate.
For milling machine in construction, milling and planing drum high speed rotation cuts road surface, and milling material is most of to transport milling by conveying system
Room, the remaining lesser milling material of particle remain in milling room.Milling and planing drum tail-gate is acted on milling by the downward power of tail-gate oil cylinder
On road surface afterwards, as equipment is advanced, the scraper of tail-gate lower end setting can take away the lesser milling material of remainder particulate.Market at present
The milling machine of upper various brands all uses this technology, which also brings other problems while solving the problems, such as material leakage,
Such as tail-gate scraper at work can destroy the road surface decorative pattern after milling, reduce it is subsequent pave pitch when adhesion strength, separately
Outer tail-gate scraper will increase the running resistance of milling machine equipment when working, substantially reduce equipment work efficiency.
Utility model content
For some or all of of the above-mentioned technical problem in the presence of the prior art, the utility model proposes one kind
For the hydraulic control circuit of milling machine tail-gate, which is able to achieve tail-gate rising and tail-gate decline function, can be according to difference
Operating condition adjustment tail-gate quick condition reduce running resistance to mitigate or eliminate destruction to milling decorative pattern, improve work effect
Rate.
In order to realize the above goal of the invention, on the one hand, the utility model proposes a kind of for the hydraulic of milling machine tail-gate
Control loop, comprising:
Constant pressure oil source,
Pressure-control valve is connected on the main oil inlet passage of constant pressure oil source；
Main reversing valve is located on main oil inlet passage, is connected to after pressure-control valve；
Tail-gate oil cylinder connects milling machine tail-gate, passes through floating up and down for the extension and contraction control tail-gate of tail-gate oil cylinder；
First control channel and the second control channel, connect with main reversing valve, and the first control channel and the second control
Channel is configured to:
When main reversing valve is in the first operating position, the rod chamber of tail-gate oil cylinder is entered by the control of the first control channel
With the control that floats up and down of the oil liquid and then realization tail-gate of rodless cavity；
When main reversing valve is in the second operating position, the rod chamber of tail-gate oil cylinder is entered by the control of the second control channel
With the control that floats up and down of the oil liquid and then realization tail-gate of rodless cavity.
In the present invention, the first control channel and the second control channel are cooperated by the operating position of main reversing valve,
Tail-gate rising can be achieved and tail-gate declines function, and can be according to different Operating condition adjustment tail-gate quick conditions.And in some operating conditions
Under, it can reduce or eliminate the destruction to milling decorative pattern on tail-gate under quick condition.In motion simultaneously, since scraper floats
Afterwards, it will not be inserted directly into milling decorative pattern while taking away milling material, reduce running resistance, improved whole work efficiency, subtract
Lack the loss that tail-gate fluid cylinder overcomes resistance, it is also more energy saving.
In one embodiment, first control channel is equipped with Y type control valve, when Y type control valve is in Y type machine
At energy position, the hydraulic fluid port A and hydraulic fluid port B of Y type control valve are connected to the hydraulic fluid port T of Y type control valve respectively, and it is logical that hydraulic fluid port T is connected to main oil inlet
The hydraulic fluid port A in road, Y type control valve is connect with the rodless cavity of tail-gate oil cylinder, the hydraulic fluid port B of Y type control valve and the rod chamber of tail-gate oil cylinder
Connection, the hydraulic fluid port P of Y type control valve connect with constant pressure oil source and are in off state.
In one embodiment, it is set on the pipeline between the hydraulic fluid port B of the Y type control valve and the rod chamber of tail-gate oil cylinder
There are pressure maintaining lock-up valve and overflow valve, when tail-gate floats, overflow valve control enters the input pressure of the rod chamber of tail-gate oil cylinder；?
When tail-gate is floated downward, pressure maintaining lock-up valve plays pressure maintaining locking effect to the pressure of tail-gate oil cylinder.
In one embodiment, the Y type control valve uses Median Function for the three-position four-way electromagnetic directional valve of Y type；
It is in the first operating position in the main reversing valve, and when Y type control valve is in middle position, tail-gate, which is in, slowly floats downward state；?
The main reversing valve is in the first operating position, and when Y type control valve is in first position, tail-gate is in fast servo state；
It is in the first operating position in the main reversing valve, and when Y type control valve is in the second position, tail-gate, which is in, quickly floats downward shape
State.
In one embodiment, the pressure maintaining lock-up valve uses two-bit triplet Solenoid ball valve.
In one embodiment, second control channel is equipped with commutation stop valve, when main reversing valve is located at second
When operating position, the rod chamber that the oil inlet passage of main reversing valve enters tail-gate oil cylinder through commutation stop valve realizes the floating of tail-gate
It is dynamic.
In one embodiment, when main reversing valve is located at the first operating position, tail-gate oil cylinder is truncated in commutation stop valve
The oil liquid of rod chamber flow directly into the channel of fuel tank.
In one embodiment, first control channel and the second control channel are located on an integrated valve block.It is logical
Crossing integrated valve block reduces the quantity and interface of disengaging oil pipe, so that overall structure is more succinct, reliable.
On the other hand, the invention also discloses a kind of hydraulic control circuits for milling machine tail-gate, comprising:
Constant pressure oil source,
Pressure-control valve is located on the main oil inlet passage of constant pressure oil source；
Main reversing valve is located on main oil inlet passage, is connected to after pressure-control valve；
At least two tail-gate oil cylinders connect milling machine tail-gate, by floating downward on the extension and contraction control tail-gate of tail-gate oil cylinder
It is dynamic；
First control channel and the second control channel, connect, and be arranged with main reversing valve are as follows: pass through main reversing valve,
One control channel and the second control channel come control into tail-gate oil cylinder rod chamber and rodless cavity oil liquid so that realize tail-gate
The control that floats up and down.
In one embodiment, first control channel and the second control channel are located on an integrated valve block, institute
The first control channel is stated equipped with 3-position 4-way Y type control valve, and in the rod chamber of the hydraulic fluid port B of Y type control valve and tail-gate oil cylinder
Between pipeline be equipped with pressure maintaining lock-up valve and overflow valve；Second control channel be equipped with commutation stop valve, described first
Control channel realizes the control that floats up and down to tail-gate oil cylinder when main reversing valve is located at the first operating position；Second control
The upper floating control to tail-gate oil cylinder is realized when main reversing valve is located at the second operating position in channel processed.
Compared with the prior art, the advantages of the utility model are:
The utility model realizes the floating control of tail-gate and floats downward control by two control channels of setting.Especially by
It is controlled in the floating for realizing tail-gate, the position where scraper can be promoted, to mitigate or eliminate scraper in the same of work
When destruction to the road surface decorative pattern after milling.In addition, can realize the switching that tail-gate floats up and down by main control valve, pass through Y type
Control valve can realize the switching of tail-gate oil-tank floating state, can realize the locking to tail-gate oil cylinder by pressure maintaining lock-up valve, thus
Meet the needs of different operating conditions and realizes that tail-gate floats to the locking of some position.In addition, the utility model is by cleverly
Hydraulic circuit setting, not only reduces the usage quantity of valve, components and pipeline, and tail-gate overall work more may be used
It leans on, is more flexible.
Detailed description of the invention
The preferred embodiment of the utility model is described in detail below in conjunction with attached drawing, in figure:
Fig. 1 show the work of one of embodiment of the hydraulic control circuit for milling machine tail-gate of the utility model
Make schematic diagram.
In attached drawing, identical component uses identical appended drawing reference.The attached drawing is not drawn according to the actual ratio.
Specific embodiment
In order to which the technical solution of the utility model and advantage is more clearly understood, below in conjunction with attached drawing to the utility model
Exemplary embodiment be described in more detail.Obviously, described embodiment is only a part of the utility model
Embodiment, rather than the exhaustion of all embodiments.And in the absence of conflict, the embodiments of the present invention and implementation
Feature in example can be combined with each other.
Inventor is during invention it is noted that after milling and planing drum tail-gate is acted on milling by the downward power of tail-gate oil cylinder
On road surface and when advancing with milling machine, the scraper of tail-gate lower end takes away the lesser milling material of remainder particulate, but tail-gate is scraped simultaneously
Knife work when the road surface decorative pattern after milling can be destroyed, reduce it is subsequent pave pitch when adhesion strength.In addition tail-gate scraper work
As when will increase the running resistance of milling machine equipment, reduce equipment work efficiency.
Against the above deficiency, the embodiments of the present invention propose a kind of hydraulic control for milling machine tail-gate time
Road is specifically described below.
It as figure 1 shows one of embodiment of the hydraulic control circuit for milling machine tail-gate of the utility model
Hydraulic principle schematic diagram.In this embodiment, the hydraulic control circuit for milling machine tail-gate of the utility model specifically includes that
Constant pressure oil source 5, pressure-control valve 11, main reversing valve 7, the first tail-gate oil cylinder 18, the first control channel and the second control channel.Its
In, pressure-control valve 11, main reversing valve 7 are both connected on the main oil inlet passage 4 of constant pressure oil source 5, and main reversing valve 7 is located at pressure control
After valve 11 processed, and it is connect by the first pipeline 9 with pressure-control valve 11.First control channel is controlled by the second pipeline 2, second
Channel processed is connected to after main reversing valve 7 by third pipeline 6.And first control channel and the second control channel be configured to: when
When main reversing valve 7 is in the first operating position (being right side in Fig. 1, the hydraulic fluid port P of main reversing valve 7 is connected to hydraulic fluid port A), pass through the first control
Channel control processed enters the rod chamber of the first tail-gate oil cylinder 18 and the oil liquid of rodless cavity and then the control that floats up and down for realizing tail-gate.
When main reversing valve 7 is in the second operating position (being left side in Fig. 1, the hydraulic fluid port P of main reversing valve 7 is connected to hydraulic fluid port B), pass through second
Control channel control enters the rod chamber of the first tail-gate oil cylinder 18 and the oil liquid of rodless cavity and then the control that floats up and down for realizing tail-gate
System.
In one embodiment, the first control channel is equipped with Y type control valve 12.And the Y type control valve 12 is configured to: when
When Y type control valve 12 is in y-function position, hydraulic fluid port T of the hydraulic fluid port A and hydraulic fluid port B of Y type control valve 12 with Y type control valve 12
Connection.At this point, hydraulic fluid port T is connected to main oil inlet passage 4, the hydraulic fluid port A of Y type control valve 12 and the first tail-gate oil cylinder by the second pipeline 2
18 rodless cavity connection, the hydraulic fluid port B of Y type control valve 12 are connected to the rod chamber of the first tail-gate oil cylinder 18, the oil of Y type control valve 12
Mouth P is connect by the 4th pipeline 3 with constant pressure oil source 5 and in off state.When main reversing valve 7 is located at the first operating position
The oil liquid of (right positions i.e. shown in FIG. 1, the hydraulic fluid port P of main reversing valve 7 is connected to hydraulic fluid port A at this time), constant pressure oil source 5 is logical through main oil inlet
Road 4, pressure-control valve 11, the first pipeline 9, main reversing valve 7, the second pipeline 2, Y type control valve 12 hydraulic fluid port T after, respectively through Y type
The hydraulic fluid port A of control valve 12, the 5th pipeline 13 enter the rodless cavity of the first tail-gate oil cylinder 18 and hydraulic fluid port B through Y type control valve 12,
6th pipeline 14 enters the rod chamber of the first tail-gate oil cylinder 18.Since the active area ratio of the rodless cavity of the first tail-gate oil cylinder 18 has
The active area of rod cavity is big, and the first tail-gate oil cylinder 18 is pushed to move down under oil liquid differential pressure action, under acting on tail-gate and being
Quick condition.And since the rod chamber of the first tail-gate oil cylinder 18 also has oil inlet, thus the speed that the first tail-gate oil cylinder 18 moves down
It spends relatively gentle.
In a preferred embodiment, it is connected with pressure gauge 8 on the first pipeline 9, which mainly detects warp
After pressure-control valve 11 depressurizes, into the oil liquid pressure of the hydraulic fluid port P of main reversing valve 7.In addition, the oil return opening of pressure-control valve 11 is logical
Piping connection is crossed to fuel tank 10.
In one embodiment, as shown in Figure 1, the hydraulic fluid port B and the first tail-gate oil cylinder 18 of connection Y type control valve 12 have bar
Pressure maintaining lock-up valve 15 and overflow valve 16 are successively arranged on 6th pipeline 14 of chamber.The pressure maintaining lock-up valve 15 is located at a left side shown in FIG. 1
When position, oil liquid is allowed to flow to the forward flow of the rod chamber of the first tail-gate oil cylinder 18, reverse flow cut-off, to rise through hydraulic fluid port B
To pressure maintaining effect.When tail-gate floats, overflow valve 16 can play the oil inlet pressure that control enters the rod chamber of the first tail-gate oil cylinder 18
Power, when pressure is more than the setting pressure of overflow valve 16, overflow valve 16 opens overflow.When tail-gate is floated downward, pressure maintaining lock-up valve 15
Pressure maintaining locking effect is played, guarantees that tail-gate is unlikely to hurtle down so as to cause damage.
In a preferred embodiment, as shown in Figure 1, Y type control valve 12 preferentially uses Median Function for three of Y type
Four-way electromagnetic reversing valve.The first operating position (right positions i.e. shown in FIG. 1, at this time main reversing valve 7 are in main reversing valve 7
Hydraulic fluid port P be connected to hydraulic fluid port A), and when Y type control valve 12 is in middle position, at this point, due to the rod chamber and nothing of the first tail-gate oil cylinder 18
Rod cavity oil inlet simultaneously, rodless cavity active area is big, and tail-gate, which is in, slowly floats downward state.First position, Y are in main reversing valve 7
When type control valve 12 is in first position (being the next in Fig. 1), the hydraulic fluid port P of Y type control valve 12 and constant pressure oil source 5 and Y type control
The hydraulic fluid port B of valve 12 processed is connected to, since tail-gate is in floating upward quickly state.First position, Y type control valve are in main reversing valve 7
12 when being in the second position (being upper in Fig. 1), and tail-gate, which is in, quickly floats downward state, and overflow valve 16 opens overflow.Y type control valve
12 upper and the next is in special circumstances, the first tail-gate oil cylinder 18 to be needed to apply added force or in special circumstances
(such as break down and need quick pressure releasing etc.) just will use.Under normal circumstances, Y type control valve 12 is in middle position.
In a preferred embodiment, as shown in Figure 1, pressure maintaining lock-up valve 15 preferentially selects two-bit triplet Solenoid ball valve.
In one embodiment, as shown in Figure 1, the second control channel is equipped with commutation stop valve 17.When main reversing valve 7 obtains
When electric (main reversing valve 7 is located at left side, and the second operating position, hydraulic fluid port P is connected to hydraulic fluid port B at this time), main reversing valve 7 passes through third pipe
The rod chamber that road 6 enters the first tail-gate oil cylinder 18 through commutation stop valve 17 realizes the upper floating of tail-gate.At this point, the first tail-gate oil cylinder
Hydraulic fluid port A and oil of the oil liquid of 18 rodless cavity after the hydraulic fluid port A of Y type control valve 12, hydraulic fluid port T through the second pipeline 2, main reversing valve 7
Mouth T flows back to fuel tank 10.
In a preferred embodiment, the oil inlet of commutation stop valve 17 connects main reversing valve 7 by third pipeline 6,
The oil outlet of commutation stop valve 17 is connected to the pipeline between the oil inlet of overflow valve 16 and the rod chamber of the first tail-gate oil cylinder 18
On.In other words, on the 6th pipeline 14 since close to one end of Y type control valve 12, by being closely connected with pressure maintaining lock in turn to remote
Determine valve 15, overflow valve 16 and commutation stop valve 17.The oil outlet of commutation stop valve 17 is more oily closer to the first tail-gate than overflow valve 16
The rod chamber of cylinder 18.
In one embodiment, it is located at the first operating position (i.e. right positions, hydraulic fluid port P and hydraulic fluid port A company in main reversing valve 7
It is logical) when, the rod chamber of the first tail-gate oil cylinder 18 and the channel of oil return box 10 is truncated in commutation stop valve 17.At this point, the first tail-gate is oily
When the rod chamber pressure of cylinder 18 reaches the cracking pressure of overflow valve 16, overflow valve 16 opens aerial drainage.
In a preferred embodiment, it is located at Y type control valve 12 in the first control channel, pressure maintaining lock-up valve 15, overflows
Stream valve 16 and the commutation stop valve 17 being located in the second control channel are located on an integrated valve block by way of integrated.It should
Integrated valve block is equipped with the hydraulic fluid port A of the rodless cavity of connection tail-gate oil cylinder, the hydraulic fluid port B for the rod chamber for connecting tail-gate oil cylinder, connection the
The hydraulic fluid port T of two pipelines 2, the hydraulic fluid port P for connecting the 4th pipeline 3 and the hydraulic fluid port A3 for connecting third pipeline 6.
In one embodiment, as shown in Figure 1, the hydraulic control circuit for milling machine tail-gate of the utility model is main
It include: constant pressure oil source 5, pressure-control valve 11, main reversing valve 7, at least two tail-gate oil cylinders, the first control channel and the second control
Channel.The present embodiment and setting one tail-gate oil cylinder the difference is that, pass through the first control channel and the second control channel
The disengaging oil of multiple tail-gate oil cylinders is controlled simultaneously.Multiple tail-gate oil cylinder can be acted on simultaneously on a tail-gate, can also be divided
It does not act on and realizes that synchronizing for multiple tail-gates is floated up and down on different tail-gates.With it is shown in FIG. 1 set there are two tail-gate oil cylinder (i.e.
Equipped with the first tail-gate oil cylinder 18 and the second tail-gate oil cylinder 1) for, the rodless cavity of the second tail-gate oil cylinder 1 passes through the 7th pipeline 19
It is connect with the 5th pipeline 13, the rod chamber of the second tail-gate oil cylinder 1 is connect by the 8th pipeline 20 with the 6th pipeline 14, to realize
First tail-gate oil cylinder 18 and the second tail-gate oil cylinder 1 move synchronously.
In a preferred embodiment, the first control channel and the second control channel are located on an integrated valve block, the
One control channel is equipped with the Y type control valve 12 of 3-position 4-way, and in the hydraulic fluid port B of Y type control valve 12 and the first tail-gate oil cylinder 18
And second tail-gate oil cylinder 1 rod chamber between pipeline be equipped with pressure maintaining lock-up valve 15 and overflow valve 16.Second control channel
It is equipped with commutation stop valve 17.First control channel is realized when main reversing valve 7 is located at the first operating position to two tail-gate oil
The control that floats up and down of cylinder 1 and 18.Second control channel is realized when main reversing valve 7 is located at the second operating position to tail-gate oil
The upper floating control of cylinder 1 and 18.
Illustrate, other than the difference emphasized, implementation, the pipeline being arranged in the embodiment of multiple tail-gate oil cylinders connect
Connecing modular construction of mode and use etc. can be identical as the setting embodiment of one tail-gate oil cylinder, so be not repeated herein
It illustrates.
Although the preferred embodiment of the utility model has been described, once a person skilled in the art knows basic
Creative concept, then additional changes and modifications may be made to these embodiments.Therefore, the following claims are intended to be interpreted as wraps
It includes preferred embodiment and falls into having altered and/or modifying, embodiment according to the present utility model for the scope of the utility model
The change and/or modification made should be covered within the scope of the utility model.
Claims (10)
1. a kind of hydraulic control circuit for milling machine tail-gate characterized by comprising
Constant pressure oil source,
Pressure-control valve is connected on the main oil inlet passage of constant pressure oil source；
Main reversing valve is located on main oil inlet passage, is connected to after pressure-control valve；
Tail-gate oil cylinder connects milling machine tail-gate, passes through floating up and down for the extension and contraction control tail-gate of tail-gate oil cylinder；
First control channel and the second control channel, connect with main reversing valve, and the first control channel and the second control channel
It is configured to:
When main reversing valve is in the first operating position, the rod chamber and nothing of tail-gate oil cylinder are entered by the control of the first control channel
The oil liquid of rod cavity and then the control that floats up and down for realizing tail-gate；
When main reversing valve is in the second operating position, the rod chamber and nothing of tail-gate oil cylinder are entered by the control of the second control channel
The oil liquid of rod cavity and then the control that floats up and down for realizing tail-gate.
2. circuit according to claim 1, which is characterized in that first control channel is equipped with Y type control valve, works as Y
Type control valve is at y-function position, and the hydraulic fluid port A and hydraulic fluid port B of Y type control valve are connected to the hydraulic fluid port T of Y type control valve respectively,
Hydraulic fluid port T is connected to main oil inlet passage, and the hydraulic fluid port A of Y type control valve is connect with the rodless cavity of tail-gate oil cylinder, the hydraulic fluid port B of Y type control valve and
The rod chamber of tail-gate oil cylinder connects, and the hydraulic fluid port P of Y type control valve connect with constant pressure oil source and is in off state.
3. circuit according to claim 2, which is characterized in that the hydraulic fluid port B of the Y type control valve has bar with tail-gate oil cylinder
Pipeline between chamber is equipped with pressure maintaining lock-up valve and overflow valve, and when tail-gate floats, overflow valve control enters having for tail-gate oil cylinder
The input pressure of rod cavity；When tail-gate is floated downward, pressure maintaining lock-up valve plays pressure maintaining locking effect to the pressure of tail-gate oil cylinder.
4. circuit according to claim 3, which is characterized in that the Y type control valve uses Median Function for three of Y type
Four-way electromagnetic reversing valve；It is in the first operating position in the main reversing valve, and when Y type control valve is in middle position, tail-gate is in
Slowly float downward state；It is in the first operating position in the main reversing valve, and when Y type control valve is in first position, at tail-gate
In fast servo state；It is in the first operating position in the main reversing valve, and when Y type control valve is in the second position, tail-gate
State is floated downward in quick.
5. circuit according to claim 4, which is characterized in that the pressure maintaining lock-up valve uses two-bit triplet Solenoid ball valve.
6. circuit according to any one of claim 1 to 5, which is characterized in that second control channel is equipped with and changes
To shut-off valve, when main reversing valve is located at the second operating position, the oil inlet passage of main reversing valve enters tail-gate through commutation stop valve
The rod chamber of oil cylinder realizes the upper floating of tail-gate.
7. circuit according to claim 6, which is characterized in that when main reversing valve is located at the first operating position, commutation is cut
Only the oil liquid of the rod chamber of valve truncation tail-gate oil cylinder flows directly into the channel of fuel tank.
8. circuit according to claim 7, which is characterized in that first control channel and the second control channel are located at one
On a integrated valve block.
9. a kind of hydraulic control circuit for milling machine tail-gate characterized by comprising
Constant pressure oil source,
Pressure-control valve is located on the main oil inlet passage of constant pressure oil source；
Main reversing valve is located on main oil inlet passage, is connected to after pressure-control valve；
At least two tail-gate oil cylinders connect milling machine tail-gate, pass through floating up and down for the extension and contraction control tail-gate of tail-gate oil cylinder；
First control channel and the second control channel, connect, and be arranged with main reversing valve are as follows: pass through main reversing valve, the first control
Channel processed and the second control channel come control into tail-gate oil cylinder rod chamber and rodless cavity oil liquid so that realize the upper of tail-gate
Lower floating control.
10. circuit according to claim 9, which is characterized in that first control channel and the second control channel are located at
On one integrated valve block, first control channel be equipped with 3-position 4-way Y type control valve, and the hydraulic fluid port B of Y type control valve with
Pipeline between the rod chamber of tail-gate oil cylinder is equipped with pressure maintaining lock-up valve and overflow valve；Second control channel is equipped with commutation
Shut-off valve, for first control channel when main reversing valve is located at the first operating position, realization floats up and down to tail-gate oil cylinder
Control；Second control channel realizes the upper floating control to tail-gate oil cylinder when main reversing valve is located at the second operating position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821689884.6U CN208885660U (en) | 2018-10-17 | 2018-10-17 | Hydraulic control circuit for milling machine tail-gate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821689884.6U CN208885660U (en) | 2018-10-17 | 2018-10-17 | Hydraulic control circuit for milling machine tail-gate |
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| CN208885660U true CN208885660U (en) | 2019-05-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083877A (en) * | 2018-10-17 | 2018-12-25 | 北京天顺长城液压科技有限公司 | Hydraulic control circuit for milling machine tail-gate |
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2018
- 2018-10-17 CN CN201821689884.6U patent/CN208885660U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083877A (en) * | 2018-10-17 | 2018-12-25 | 北京天顺长城液压科技有限公司 | Hydraulic control circuit for milling machine tail-gate |
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