CN113236272A - Hydraulic control system for foam system, foam system and shield tunneling machine - Google Patents
Hydraulic control system for foam system, foam system and shield tunneling machineDownload PDFInfo
- Publication number
- CN113236272A CN113236272ACN202110603347.5ACN202110603347ACN113236272ACN 113236272 ACN113236272 ACN 113236272ACN 202110603347 ACN202110603347 ACN 202110603347ACN 113236272 ACN113236272 ACN 113236272A
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- valve
- oil
- control
- foam
- reversing
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- 239000006260foamSubstances0.000titleclaimsabstractdescription48
- 230000005641tunnelingEffects0.000titleclaimsdescription5
- 238000006073displacement reactionMethods0.000claimsdescription7
- 239000000203mixtureSubstances0.000claims2
- 239000007788liquidSubstances0.000abstractdescription10
- 238000000034methodMethods0.000abstractdescription5
- 238000010276constructionMethods0.000description3
- 238000013016dampingMethods0.000description3
- 238000012423maintenanceMethods0.000description3
- 230000000694effectsEffects0.000description2
- 238000012986modificationMethods0.000description2
- 230000004048modificationEffects0.000description2
- 230000000630rising effectEffects0.000description2
- 230000003321amplificationEffects0.000description1
- 230000009286beneficial effectEffects0.000description1
- 238000010586diagramMethods0.000description1
- 239000012535impuritySubstances0.000description1
- 238000003199nucleic acid amplification methodMethods0.000description1
- 238000013024troubleshootingMethods0.000description1
Images
Classifications
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0426—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling the number of pumps or parallel valves switched on
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Technical Field
The invention belongs to the technical field of control of a foam system of a shield machine, and particularly relates to a hydraulic control system for the foam system, the foam system and the shield machine.
Background
At present, a single-screw pump or a black cat pump and a frequency converter are adopted to control a foam system of the existing shield machine, the screw pump is expensive, a stator and a rotor are easy to wear in the construction process, the flow output of the pump is influenced, the field maintenance is difficult, the construction progress is influenced, when more foam impurities exist, the rotor can be blocked, the motor is overloaded and generates heat, the service life of the motor is shortened, and meanwhile, the fault of a circuit breaker can be caused. The cylinder stopper easily takes place wearing and tearing in the use of black cat pump, reduces the siphon effect of pump, and pressure fluctuation is great in the operation process, reaches the required flow of normal work, and the replacement cost is higher, has very big difference simultaneously on control mode, and traditional foam mixed liquid pump adopts the converter control, and the maintenance cost is higher, and it is harsh to service environment requirement, and proportional control changes the maintenance, and the use scene is more extensive.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a hydraulic control system, foam system and shield constructs machine for foam system, can make the output flow of foam mixing liquid pump improve and reliable and stable, the control unit is not fragile, life is longer.
The invention is realized by the following steps: a hydraulic control system for a foam system comprises a variable pump, a first reversing valve, a power valve, a reset oil cylinder, a ball valve, a control oil cylinder, a pressure cut-off valve, a flow control valve, a second reversing valve and a hydraulic motor;
the variable pump is connected with a main oil way, one path of control oil way led out from the main oil way is connected with a rodless cavity of the control oil cylinder through a flow control valve or a pressure cut-off valve, and the other path of control oil way is led out and connected with a rodless cavity of the reset oil cylinder; the leakage oil of the variable pump shell is connected with an oil tank; the second reversing valves and the hydraulic motors are arranged in plurality and are connected into the main oil way in parallel, the ball valves are connected into the main oil way, and the second reversing valves are connected with the hydraulic motors in a one-to-one correspondence manner;
the flow control valve and the pressure cut-off valve are connected into the control oil way in parallel, an oil port on one side of the first reversing valve is connected with the power valve, the other oil port of the power valve is connected with a shell leakage oil port of the variable pump, and an oil port on the other side of the first reversing valve is connected with the shell leakage oil port of the variable pump and an oil tank; the control oil cylinder and the reset oil cylinder are both connected with a swash plate of the variable pump, and the control oil cylinder controls the working pressure of the power valve.
The main oil way is led out to be connected with the first overflow valve, and the other oil port of the first overflow valve is connected with an oil tank.
Further, under the condition that the ball valve is closed and the first reversing valve is in a non-working position, the pressure oil output by the variable pump returns to the oil tank through the first reversing valve;
when the ball valve is closed and the first reversing valve is in a working position, pressure oil output by the variable pump enters a rodless cavity of the reset oil cylinder;
and under the condition that the ball valve is opened and the first reversing valve is in a working position, the pressure oil output by the variable pump enters the hydraulic motor through the ball valve and the second reversing valve.
Furthermore, the second reversing valve is provided with a first working position, a second working position and a non-working position, when the second reversing valve is positioned at the first working position, the forward oil path of the hydraulic motor is in a conducting state, when the second reversing valve is positioned at the second working position, the reverse oil path of the hydraulic motor is in a conducting state, and when the second reversing valve is positioned at the non-working position, the forward oil path and the reverse oil path of the hydraulic motor are both in a closing state.
Furthermore, the first reversing valve is an electromagnetic reversing valve, and the second reversing valve is a proportional reversing valve.
Furthermore, a control oil port of the variable pump is connected with the first reversing valve through a first damper, and an oil outlet of the pressure cut-off valve is connected with a pump leakage port through a second damper and a third damper.
The invention also provides a foam system which comprises the foam mixed liquid pump and a control system, wherein the control system is the hydraulic control system for the foam system, and the hydraulic motor is connected with a valve core of the foam mixed liquid pump through a crankshaft connecting rod mechanism.
The invention also provides a shield tunneling machine which comprises a foam system, wherein the foam system is the foam system.
The invention has the following beneficial effects: the control system can improve the output flow of the foam mixed liquid pump, the working process is stable and reliable, the control part is not easy to damage in the construction process, the troubleshooting is simple, the replacement cost of accessories is lower, the control mode is simple, the whole occupied space of the system is small, and the service life is longer.
Drawings
FIG. 1 is a schematic diagram of a hydraulic control system according to the present invention;
fig. 2 is a partially enlarged view of the hydraulic control system shown in fig. 1.
Reference numerals:
1 a variable displacement pump; 2 a first direction valve; 3 a first overflow valve; 4, a ball valve; 5 a second reversing valve; 6 a hydraulic motor; 7 flow control valves; 8, a pressure cut-off valve; 9 controlling the oil cylinder; 10 resetting the oil cylinder; 11 power valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 2, a hydraulic control system for a foam system comprises avariable displacement pump 1, a first reversing valve 2, apower valve 11, areset cylinder 10, a ball valve 4, acontrol cylinder 9, a quantity control valve 7, a pressure cut-off valve 8, a second reversing valve 5 and a hydraulic motor 6.
Thevariable pump 1 is driven by a motor, an oil port of the variable pump is connected with a main oil way, one path of control oil way led out from the main oil way is connected with a rodless cavity of acontrol oil cylinder 9 through a flow control valve 7 or a pressure cut-off valve 8, and the other path of control oil way is led out and connected with a rodless cavity of areset oil cylinder 10; the shell of thevariable displacement pump 1 is connected with an oil tank by leaked oil. Six second reversing valves 5 and six hydraulic motors 6 are arranged and are connected into the main oil way in parallel, and the parallel arrangement enables a user to independently control each second reversing valve 5, so that the hydraulic motors 6 are controlled to rotate forwards and backwards. The ball valves 4 are connected in the main oil way, and the second reversing valves 5 are correspondingly connected with the hydraulic motors 6 one by one.
The flow control valve 7 and the pressure cut-off valve 8 are connected in parallel to each other to a control oil circuit, an oil port on one side of the first reversing valve 2 is connected with thepower valve 11, the other oil port of thepower valve 11 is connected with a leakage oil port of thevariable pump 1, and an oil port on the other side of the first reversing valve 2 is connected with the leakage oil port of thevariable pump 1 and an oil tank; thecontrol oil cylinder 9 and thereset oil cylinder 10 are both connected with a swash plate of thevariable pump 1, and thecontrol oil cylinder 9 controls the working pressure of thepower valve 11.
In an optional embodiment, the system further comprises afirst overflow valve 3, one path of the main oil path is connected with thefirst overflow valve 3, and the other oil port of thefirst overflow valve 3 is connected with an oil tank.
In an alternative embodiment, in a state that the ball valve 4 is closed and the first reversing valve 2 is in a non-working position, the pressure oil output by thevariable displacement pump 1 returns to the oil tank through the first reversing valve 2;
when the ball valve 4 is closed and the first reversing valve 2 is in a working position, pressure oil output by thevariable pump 1 passes through a rodless cavity of thereset oil cylinder 10 to push a swash plate of thevariable pump 1 to gradually increase, the flow of thevariable pump 1 increases accordingly, when the flow of thevariable pump 1 exceeds the flow required by a load, redundant flow enables system pressure to start rising, when the pressure exceeds the preset pressure of a spring of the flow control valve 7, the valve core is pushed to move to the right, control oil pumped out enters a rodless cavity of thecontrol oil cylinder 9 through the flow control valve 7, and the action area of the rodless cavity of thecontrol oil cylinder 9 is larger than that of the rodless cavity of thereset oil cylinder 10, so that the swing angle of the swash plate pushing thevariable pump 1 is gradually reduced, the output flow of thevariable pump 1 is reduced, and the variable is stopped until the output of the control oil is matched with the flow required by the load.
In a state that the ball valve 4 is opened and the first direction changing valve 2 is in the working position, the pressure oil output by thevariable displacement pump 1 enters the hydraulic motor 6 through the ball valve 4 and the second direction changing valve 5.
In an alternative embodiment, the second direction valve 5 has a first working position, a second working position, and a non-working position, and when the second direction valve is in the first working position, the forward oil path of the hydraulic motor 6 is in a conducting state, and when the second direction valve is in the second working position, the reverse oil path of the hydraulic motor 6 is in a conducting state, and when the second direction valve is in the non-working position, both the forward oil path and the reverse oil path of the hydraulic motor 6 are in a closed state.
In an alternative embodiment, the first direction valve 2 is an electromagnetic direction valve and the second direction valve 5 is a proportional direction valve.
In an alternative embodiment, a control oil port of thepump 1 is connected with the first reversing valve 2 through a first damping, and an oil outlet of the pressure cut-off valve 8 is connected with a pump leakage port through a second damping and a third damping.
Based on the same inventive concept, the invention also provides a foam system, which comprises a foam mixed liquid pump and a control system, wherein the control system is the hydraulic control system for the foam system, and the hydraulic motor 6 is connected with a valve core of the foam mixed liquid pump through a crankshaft connecting rod mechanism.
Based on the same inventive concept, the invention also provides a shield tunneling machine which comprises a foam system, wherein the foam system is the foam system.
After the system is started, the motor drives thevariable pump 1 to operate, when the first reversing valve 2 is not electrified, the first reversing valve is in a non-working position, pumped oil flows back to an oil tank through the first reversing valve 2, and at the moment, thevariable pump 1 is in an idle state. When the first reversing valve 2 is electrified, pressure oil output by thevariable pump 1 enters a rodless cavity of thereset oil cylinder 10 to push a swash plate of the variable pump to slowly increase, the flow of the variable pump increases along with the increase of the flow, when the flow of the variable pump exceeds the flow required by a load, redundant flow enables system pressure to start rising, when the pressure exceeds the preset pressure of a spring of the flow control valve 7, a valve core is pushed to move right, control oil output by the variable pump enters a rodless cavity of thecontrol oil cylinder 9 through the flow control valve 7, the action area of the rodless cavity of thecontrol oil cylinder 9 is larger than that of the rodless cavity of the reset oil cylinder, the swing angle of the swash plate of thevariable pump 1 is pushed to slowly decrease, the output flow of the pump is reduced, the variable is stopped until the flow is matched with the required flow of the load, thevariable pump 1 starts to load pressure, the oil control in thevariable pump 1 acts on the left end of the valve core of the pressure stop valve 8 and moves left and right of the valve core of the control pressure stop valve 8 with the preset pressure balance of the spring of the pressure stop valve 8, guarantee that the output pressure ofvariable pump 1 is invariable, reach rated operating pressure,first overflow valve 3 plays the safety protection effect to whole system, prevents that pressure is too big, harmvariable pump 1, influences life. After the pressure of the system is stable, the ball valve 4 is opened, the pressure oil enters the second reversing valve 5, the second reversing valve 5 has a manual or electric control operation mode, and the hydraulic motor 6 is driven to work through proportional control under a normal working condition. The current value of the proportional amplification card is changed, the valve core position of the second reversing valve 5 is adjusted, so that the valve outlet flow is changed, the rotating speed of the hydraulic motor 6 is changed, the output shaft of the hydraulic motor 6 is connected with the crankshaft, the crankshaft is provided with the connecting rod, the connecting rod drives the piston of the foam mixed liquid pump, through the mechanism, the rotary motion of the hydraulic motor 6 can be converted into the reciprocating linear motion of the piston, the rotating speed of the hydraulic motor 6 is changed, and the flow size of the outlet of the foam mixed liquid pump can be changed.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, "a plurality" means two or more unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A hydraulic control system for a foam system is characterized by comprising a variable pump (1), a first reversing valve (2), a power valve (11), a reset oil cylinder (10), a ball valve (4), a control oil cylinder (9), a flow control valve (7), a pressure cut-off valve (8), a second reversing valve (5) and a hydraulic motor (6);
the variable pump (1) is connected with a main oil path, one path of control oil path led out from the main oil path is connected with a rodless cavity of a control oil cylinder (9) through a flow control valve (7) or a pressure cut-off valve (8), and the other path of control oil path is led out and connected with a rodless cavity of a reset oil cylinder (10); the shell of the variable pump (1) is connected with an oil tank through leakage oil; the second reversing valves (5) and the hydraulic motors (6) are arranged in a plurality and are connected into the main oil way in parallel, the ball valves (4) are connected into the main oil way, and the second reversing valves (5) are correspondingly connected with the hydraulic motors (6) one by one;
the flow control valve (7) and the pressure cut-off valve (8) are connected into the control oil way in parallel, an oil port on one side of the first reversing valve (2) is connected with the power valve (11), the other oil port of the power valve (11) is connected with a shell leakage oil port of the variable pump (1), and an oil port on the other side of the first reversing valve (2) is connected with the shell leakage oil port of the variable pump (1) and an oil tank; the control oil cylinder (9) and the reset oil cylinder (10) are both connected with a swash plate of the variable pump (1), and the control oil cylinder (9) controls the working pressure of the power valve (11).
2. The hydraulic control system for the foam system according to claim 1, further comprising a first overflow valve (3), wherein one way of the main oil path is connected with the first overflow valve (3), and another oil port of the first overflow valve (3) is connected with an oil tank.
3. A hydraulic control system for a foam system according to claim 1, wherein in a state where the ball valve (4) is closed and the first direction valve (2) is in a non-operating position, the pressure oil output by the variable displacement pump (1) is returned to the tank through the first direction valve (2);
when the ball valve (4) is closed and the first reversing valve (2) is in a working position, pressure oil output by the variable pump (1) enters a rodless cavity of the reset oil cylinder (10);
and under the condition that the ball valve (4) is opened and the first reversing valve (2) is in a working position, the pressure oil output by the variable pump (1) enters the hydraulic motor (6) through the ball valve (4) and the second reversing valve (5).
4. A hydraulic control system for a foam system according to claim 1, wherein the second directional control valve (5) has a first operating position in which the forward oil circuit of the hydraulic motor (6) is in a conducting state, a second operating position in which the reverse oil circuit of the hydraulic motor (6) is in a conducting state, and a non-operating position in which the forward and reverse oil circuits of the hydraulic motor (6) are in a closed state.
5. A hydraulic control system for a foam system according to claim 4, characterized in that the first directional valve (2) is a solenoid directional valve and the second directional valve (5) is a proportional directional valve.
6. The hydraulic control system for the foam system as claimed in claim 1, wherein a control oil port from the variable displacement pump (1) is connected with a first reversing valve (2) through a first damper, and an oil outlet of the pressure cut-off valve (8) is connected with a pump leakage port through a second damper and a third damper.
7. A foam system comprising a foam mixture pump and a control system, characterized in that the control system is a hydraulic control system for a foam system according to claim 1, and the hydraulic motor (6) is connected to a spool of the foam mixture pump by a crankshaft linkage.
8. A shield tunneling machine comprising a foam system, wherein the foam system is a foam system according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110603347.5ACN113236272A (en) | 2021-05-31 | 2021-05-31 | Hydraulic control system for foam system, foam system and shield tunneling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110603347.5ACN113236272A (en) | 2021-05-31 | 2021-05-31 | Hydraulic control system for foam system, foam system and shield tunneling machine |
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| Publication Number | Publication Date |
|---|---|
| CN113236272Atrue CN113236272A (en) | 2021-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110603347.5APendingCN113236272A (en) | 2021-05-31 | 2021-05-31 | Hydraulic control system for foam system, foam system and shield tunneling machine |
Country Status (1)
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|---|---|
| CN (1) | CN113236272A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6454540B1 (en)* | 2000-03-31 | 2002-09-24 | Kovatch Mobile Equipment Corp. | Modular balanced foam flow system |
| CN105351271A (en)* | 2015-12-04 | 2016-02-24 | 中联重科股份有限公司 | Proportional hydraulic control system |
| CN108397447A (en)* | 2017-12-27 | 2018-08-14 | 中国矿业大学 | A kind of valve-pump joint multi-mode hydraulic control system and its control method |
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| CN210118127U (en)* | 2019-03-07 | 2020-02-28 | 江苏重亚重工有限公司 | Shield constructs quick-witted foaming system |
| CN215256202U (en)* | 2021-05-31 | 2021-12-21 | 徐工集团凯宫重工南京股份有限公司 | Hydraulic control system for foam system, foam system and shield tunneling machine |
- 2021
- 2021-05-31CNCN202110603347.5Apatent/CN113236272A/enactivePending
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|---|---|---|---|---|
| US6454540B1 (en)* | 2000-03-31 | 2002-09-24 | Kovatch Mobile Equipment Corp. | Modular balanced foam flow system |
| CN105351271A (en)* | 2015-12-04 | 2016-02-24 | 中联重科股份有限公司 | Proportional hydraulic control system |
| CN108397447A (en)* | 2017-12-27 | 2018-08-14 | 中国矿业大学 | A kind of valve-pump joint multi-mode hydraulic control system and its control method |
| CN209294154U (en)* | 2018-12-10 | 2019-08-23 | 扬州盛达特种车有限公司 | A kind of stepless speed regulation hydraulic system of pavement cleaning vehicle |
| CN210118127U (en)* | 2019-03-07 | 2020-02-28 | 江苏重亚重工有限公司 | Shield constructs quick-witted foaming system |
| CN215256202U (en)* | 2021-05-31 | 2021-12-21 | 徐工集团凯宫重工南京股份有限公司 | Hydraulic control system for foam system, foam system and shield tunneling machine |
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| Title |
|---|
| 机械工程学会流体传动与控制分会: "《液压变量泵（马达）变量调节原理与应用 第2版》", 30 June 2018, 机械工业出版社, pages: 92 - 94* |
| 陈辉: "《液压与气动技术》", 31 December 2019, 中国铁道出版社有限公司, pages: 91 - 94* |
| 黄凡: "盾构机推进系统协调控制策略研究与实现", 中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑, no. 2, 15 February 2018 (2018-02-15), pages 034 - 699* |
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