CN112324728A - Hydraulic system capable of preventing high temperature - Google Patents
Hydraulic system capable of preventing high temperature Download PDFInfo
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- CN112324728A CN112324728A CN202011076344.2A CN202011076344A CN112324728A CN 112324728 A CN112324728 A CN 112324728A CN 202011076344 A CN202011076344 A CN 202011076344A CN 112324728 A CN112324728 A CN 112324728A
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- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
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- 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
- F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
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- 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
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- 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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
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- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/86—Control during or prevention of abnormal conditions
- F15B2211/863—Control during or prevention of abnormal conditions the abnormal condition being a hydraulic or pneumatic failure
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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/865—Prevention of failures
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a high-temperature-prevention hydraulic system which mainly comprises a first hydraulic pump, a main control loop and an actuating mechanism, wherein the first hydraulic pump is provided with a load-sensitive control system and can provide pressure oil with pressure and flow required by normal operation of the system by matching with the main control loop according to the actual application state of the actuating mechanism and a load, in order to improve the operation stability of the system, a three-way flow valve and a high-pressure overflow loop are also arranged, wherein the set pressure of the control port of the three-way flow valve is smaller than the overflow pressure of the high-pressure overflow valve loop, the three-way flow valve can play a certain energy-saving role by adjusting the flow of the oil path when the actuating mechanism works, meanwhile, when the first hydraulic pump fails and the flow of the pressure oil cannot be regulated, the system can complete low-pressure flow division through the three-way flow valve, and high-pressure relief is finished through the high-pressure overflow loop, so that the whole system is kept in a stable state of low-temperature operation.
Description
Technical Field
The invention relates to a hydraulic system, in particular to a high-temperature-prevention hydraulic system.
Background
In the existing GTBZ series main arm variable amplitude hydraulic system, a load sensitive pump is mainly used for power output regulation, when the load sensitive pump is under the condition of controlling plunger abrasion or under the action of other factors, a variable plunger pump in the load sensitive pump is blocked and cannot return to the minimum displacement, the variable plunger pump continuously outputs at the blocking flow rate, when the blocking flow rate is too high, the pressure of the whole system is increased and is in a working state of high flow and high pressure for a long time, and further the whole hydraulic system is heated seriously and even burns out hydraulic elements, corresponding hydraulic systems and other serious consequences, meanwhile, a corresponding warning structure is lacked in the existing main arm variable amplitude hydraulic system to remind technical personnel to take related measures, and the whole vehicle hydraulic system is further damaged under the condition that emergency measures are not taken.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a high-temperature-prevention hydraulic system which has protection functions of preventing high temperature, alarming and the like.
The hydraulic system for preventing high temperature according to an embodiment of the present invention includes:
a main oil tank;
the first hydraulic pump is connected with the main oil tank and is provided with a load-sensitive control system for providing pressure oil with adjustable pressure and flow;
the main control loop is connected with the main oil tank and the first hydraulic pump and is provided with a high-pressure overflow loop;
the actuating mechanism is arranged on the main control loop;
the three-way flow valve is provided with a first oil port, a second oil port and an external control port, the first oil port is connected with the pump outlet of the first hydraulic pump, the second oil port is connected with the main oil tank, the external control port is connected with the load sensitive control system, the set pressure of the external control port is greater than the control pressure of the load sensitive control system, and the pressure of the external control port is less than the overflow pressure of the high-pressure overflow loop.
According to the hydraulic system for preventing high temperature, the technical effects are as follows:
the high-temperature-preventing hydraulic system mainly comprises a first hydraulic pump, a main control loop and an actuating mechanism, wherein the first hydraulic pump is provided with a load sensitive control system and can provide pressure oil with pressure and flow required by normal operation of the system by matching with the main control loop according to the actual application state of the actuating mechanism and a load, in order to improve the operation stability of the system, a three-way flow valve and a high-pressure overflow loop are also arranged, wherein the set pressure of the control port of the three-way flow valve is smaller than the overflow pressure of the high-pressure overflow valve loop, the three-way flow valve can play a certain energy-saving role by adjusting the flow of the oil path when the actuating mechanism works, meanwhile, when the first hydraulic pump fails and the flow of the pressure oil cannot be regulated, the system can complete low-pressure flow division through the three-way flow valve, and high-pressure relief is finished through the high-pressure overflow loop, so that the whole system is kept in a stable state of low-temperature operation.
According to some embodiments of the invention, the load-sensitive control system is provided with a load-sensitive control valve, a load feedback branch is arranged between one oil inlet of the load-sensitive control valve and the oil inlet end of the actuating mechanism, and the external control port is connected with the load feedback branch, so that the control port of the three-way flow valve can be connected to the load-sensitive control system, the three-way flow valve can obtain the actual operating pressure of the actuating mechanism and the load, and the three-way flow valve is matched with the load-sensitive control system to perform shunt control, so that the whole system can keep a stable state of low-temperature operation.
According to some embodiments of the invention, the load-sensitive control system is provided with a third one-way valve in one-way communication with the load-sensitive control valve on the load feedback branch, so as to improve the stability of the load feedback branch.
According to some embodiments of the present invention, the main control circuit is provided with a main oil inlet path and a main oil return path, a first check valve for connection is disposed between the pump outlet of the first hydraulic pump and the main oil inlet path, the first check valve is unidirectionally communicated along the outlet direction of the pressure oil pump of the first hydraulic pump, and the first oil port is disposed near the oil outlet end of the first check valve, so as to prevent the pressure oil from reversely flowing into the pump outlet of the first hydraulic pump to damage the internal structure of the first hydraulic pump.
According to some embodiments of the invention, the oil outlet end of the first check valve is provided with a monitoring structure for monitoring the pump-out oil pressure of the first hydraulic pump.
According to some embodiments of the invention, the monitoring structure is provided with a pressure control switch for warning a technician to perform a relevant operation when a preset pressure value is reached.
According to some embodiments of the invention, a second hydraulic pump is further provided on the main control circuit in parallel with the first hydraulic pump for emergency oil supply.
According to some embodiments of the invention, the pump outlet of the second hydraulic pump is provided with a second check valve, the second check valve is in one-way conduction along the outlet direction of the pressure oil of the second hydraulic pump, and the first oil port is arranged near the oil outlet end of the second check valve, so as to prevent the pressure oil from reversely flowing into the pump outlet of the second hydraulic pump and damaging the internal structure of the second hydraulic pump.
According to some embodiments of the invention, the actuator is provided with a variable-amplitude executing assembly and a rotary executing assembly in parallel on the main control loop, the variable-amplitude executing assembly is used for variable-amplitude control of the main arm, and the rotary executing assembly is used for rotary control of the main arm.
In some embodiments of the invention, the second hydraulic pump is a conventional fixed displacement pump.
In some embodiments of the invention, the variable-amplitude execution assembly is sequentially provided with a first proportional flow valve, a first reversing valve, a first variable-amplitude balance valve and a variable-amplitude oil cylinder along an oil inlet direction, the first proportional overflow valve is provided with a DT2 electromagnetic control port for control, the first reversing valve is provided with a left DT8a electromagnetic control port and a right DT8b electromagnetic control port for control, and an access point of a load feedback branch is arranged between the first reversing valve and the first proportional overflow valve (which is equal to the position close to the oil inlet end of the variable-amplitude oil cylinder), so that the oil inlet pressure of the variable-amplitude oil cylinder and the oil pressure during load operation can be obtained by using the load feedback branch, and a load sensitive control system can feed back and control the first hydraulic pump in real time to provide pressure and pressure oil with.
In some embodiments of the invention, the rotary actuating assembly is provided with a second proportional flow valve, a second reversing valve, a second variable-amplitude balance valve and a rotary motor in sequence along the oil inlet direction, wherein the second proportional overflow valve is provided with a DT1 electromagnetic control port for control, and the second reversing valve is provided with a left position DT6a electromagnetic control port and a right position DT6b electromagnetic control port for control so as to form a complete main arm rotary control loop.
In some embodiments of the present invention, the first and second reversing valves are each provided as a "Y" type three-position, four-way solenoid operated valve to facilitate solenoid control of the system.
According to some embodiments of the invention, a main relief valve is provided on the high pressure relief circuit for controlling opening and closing of the high pressure relief circuit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an overall structural schematic diagram of a hydraulic system for preventing high temperature according to an embodiment of the present invention;
reference numerals:
the variable-amplitude hydraulic control system comprises a first hydraulic pump 101, a main control loop 102, a first proportional flow valve 103, a first reversing valve 104, a first variable-amplitude balance valve 105, a variable-amplitude oil cylinder 106, a main overflow valve 107, a second one-way valve 108, a three-way flow valve 109, a load sensitive control valve 110, a load sensitive control cylinder 111, a second hydraulic pump 112, a monitoring structure 113 and a third one-way valve 114.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, 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 "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases for the ordinary worker skilled in the art.
Referring to fig. 1, the present invention provides a hydraulic system for preventing high temperature, including:
a main oil tank;
the first hydraulic pump 101 is connected with the main oil tank, and the first hydraulic pump 101 is provided with a load-sensitive control system and used for providing pressure oil with adjustable pressure and flow;
the main control loop 102 is connected with the main oil tank and the first hydraulic pump 101, and a high-pressure overflow loop is arranged on the main control loop 102;
the actuating mechanism is arranged on the main control loop 102;
the three-way flow valve 109 is provided with a first oil port, a second oil port and an external control port, the first oil port is connected with an outlet of the first hydraulic pump 101, the second oil port is connected with the main oil tank, the external control port is connected with the load sensitive control system, the set pressure of the external control port is greater than the control pressure of the load sensitive control system, and the pressure of the external control port is less than the overflow pressure of the high-pressure overflow loop.
According to the above structure, the hydraulic system for preventing high temperature proposed by the present invention mainly comprises a first hydraulic pump 101, a main control loop 102 and an actuator, wherein the first hydraulic pump 101 is provided with a load-sensitive control system, which can cooperate with the main control loop 102 to provide pressure oil with pressure and flow rate required by normal operation of the system according to the actual operation state of the actuator and load, and in order to improve the operation stability of the system, a three-way flow valve 109 and a high-pressure overflow loop are further provided, because the set pressure of the control port of the three-way flow valve 109 is smaller than the overflow pressure of the high-pressure overflow valve loop, and the set pressure of the control port of the three-way flow valve 109 is larger than the control pressure of the load-sensitive control system, so that the three-way flow valve 109 can exert a certain energy saving effect by adjusting the flow rate of the oil path when the actuator works, the system can accomplish the low pressure reposition of redundant personnel through tee bend flow valve 109 (low pressure here indicates the low pressure state of certain degree, can guarantee that the sensitive control system of load adjusts and controls first hydraulic pump 101 and obtain the required normal pressure of system operation and the pressure oil of flow) and accomplish high-pressure release through high-pressure overflow return circuit, and then make whole system keep in the steady state of low temperature operation.
In some embodiments of the present invention, as shown in fig. 1, the load-sensitive control system is provided with a load-sensitive control valve 110, a load feedback branch is provided between an oil inlet of the load-sensitive control valve 110 and an oil inlet of the actuator, and the external control port is connected to the load feedback branch, so that the control port of the three-way flow valve 109 can be connected to the load-sensitive control system, so that the three-way flow valve 109 can obtain actual operating pressure of the actuator and the load, and further perform shunt control by cooperating with the load-sensitive control system, so that the entire system maintains a stable state of low-temperature operation.
In some embodiments of the present invention, as shown in fig. 1, the load-sensitive system is further provided with a load-sensitive control cylinder 111 connected to the load-sensitive control valve 110 for cooperating with the flow and pressure regulation of the pressure oil, and cooperating with the first hydraulic pump 101 to form a load-sensitive variable displacement pump suitable for the operation of the system.
In some embodiments of the present invention, as shown in fig. 1, the load-sensitive control system is provided with a third check valve 114 in one-way communication with the load-sensitive control valve 110 on the load feedback branch, so as to improve the stability of the load feedback branch.
In some embodiments of the present invention, as shown in fig. 1, the main control circuit 102 is provided with a main oil inlet path and a main oil return path, a first check valve for connection is disposed between the pump outlet of the first hydraulic pump 101 and the main oil inlet path, the first check valve is in one-way communication along the pressure oil pumping direction of the first hydraulic pump 101, and the first oil port is disposed near the oil outlet end of the first check valve to prevent the pressure oil from reversely flowing into the pump outlet of the first hydraulic pump 101 to damage the internal structure of the first hydraulic pump 101.
In some embodiments of the present invention, as shown in fig. 1, the oil outlet end of the first check valve is provided with a monitoring structure 113 for monitoring the output oil pressure of the first hydraulic pump 101.
In some embodiments of the present invention, as shown in fig. 1, the monitoring structure 113 is provided with a pressure control switch for warning a technician to perform a relevant operation when a preset pressure value is reached.
In some embodiments of the present invention, as shown in fig. 1, a second hydraulic pump 112 is further provided on the main control circuit 102 in parallel with the first hydraulic pump 101 for oil supply in an emergency state.
In some embodiments of the present invention, as shown in fig. 1, the pump outlet of the second hydraulic pump 112 is provided with a second check valve 108, the second check valve 108 is in one-way communication along the pressure oil pumping direction of the second hydraulic pump 112, and the first oil port is disposed near the oil outlet end of the second check valve 108, so as to prevent the pressure oil from reversely flowing into the pump outlet of the second hydraulic pump 112 and damaging the internal structure of the second hydraulic pump 112.
In some embodiments of the present invention, as shown in FIG. 1, the second hydraulic pump 112 is a conventional fixed displacement pump.
In some embodiments of the present invention, as shown in fig. 1, the actuator is provided with a luffing actuating assembly and a slewing actuating assembly in parallel on the master control loop 102, wherein the luffing actuating assembly is used for luffing control of the master arm, and the slewing actuating assembly is used for slewing control of the master arm.
In some embodiments of the present invention, as shown in fig. 1, the luffing actuating assembly is sequentially provided with a first proportional flow valve 103, a first reversing valve 104, a first luffing balance valve 105 and a luffing cylinder 106 along an oil inlet direction, the first proportional relief valve 103 is provided with a DT2 solenoid control port for control, the first reversing valve 104 is provided with a left DT8a solenoid control port and a right DT8b solenoid control port for control, and an access point of a load feedback branch is arranged between the first reversing valve 104 and the first proportional relief valve 103 (equivalently close to the oil inlet end of the luffing cylinder 106), so that the oil inlet pressure of the luffing cylinder 106 and the oil pressure during load operation can be obtained by using the load feedback branch, so that the load sensitive control system can feed back and control the first hydraulic pump 101 in real time to provide pressure and pressure oil with flow rate required by system operation.
In some embodiments of the present invention, as shown in fig. 1, the rotary actuator assembly is provided with a second proportional flow valve, a second reversing valve, a second variable-amplitude balance valve and a rotary motor in sequence along the oil inlet direction, wherein the second proportional overflow valve is provided with a DT1 electromagnetic control port for control, and the second reversing valve is provided with a left DT6a electromagnetic control port and a right DT6b electromagnetic control port for control, so as to form a complete main arm rotary control loop.
In some embodiments of the present invention, as shown in FIG. 1, the first directional valve 104 and the second directional valve are each configured as a "Y" type three-position, four-way solenoid operated valve to facilitate solenoid control of the system.
In some embodiments of the present invention, as shown in fig. 1, a main relief valve 107 is disposed on the high-pressure relief circuit for controlling the opening and closing of the high-pressure relief circuit.
In summary, the hydraulic system for placing high temperature proposed by the present invention is mainly suitable for hydraulic control of the luffing of the GTBZ series main arm, specifically, as shown in fig. 1, when the main arm is in a normal working state, such as the luffing action of the main arm, the electromagnet DT2 of the first proportional flow valve 103 is energized, and at the same time, the electromagnet DT8a of the first directional valve 104 is energized, and pressure oil of the first hydraulic pump 101 sequentially enters the main control loop 102 through the pump outlet of the first hydraulic pump 101, passes through the first proportional flow valve 103, the left end of the first directional valve 104, and the first luffing balance valve 105, and then enters the rodless cavity of the luffing cylinder 106 of the main arm, so as to drive the piston rod of the luffing cylinder 106 of the main arm to extend to drive the main arm to ascend and amplitude, and when the electromagnet DT8b of the first directional valve 104 is energized, the piston.
When the main arm stops operating, if the first hydraulic pump 101 fails (i.e. the plunger of the load-sensitive pump (the first hydraulic pump 101) is worn or the control plunger inside the load-sensitive pump is stuck at a certain position due to other reasons) to output a fixed flow of pressure oil, when the oil pressure is less than the set pressure value of the spring (namely the set pressure value of the control port) of the three-way flow valve 109, the whole system is in a small flow and low pressure working state, the system can not be damaged by high temperature and high pressure, when the oil pressure is larger than the set pressure value of the spring of the three-way flow valve 109, the three-way flow valve 109 is opened to complete shunting and pressure relief, so that the whole system keeps a stable low-temperature running state, in special cases, pressure relief protection may also be accomplished by the main relief valve 107, which, during the entire process, when the oil pressure reaches the set alarm pressure or alarm state of the pressure switch, the control system can protect the hydraulic system through alarm or other measures.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A hydraulic system for preventing high temperatures, comprising:
a main oil tank;
the first hydraulic pump is connected with the main oil tank and is provided with a load-sensitive control system for providing pressure oil with adjustable pressure and flow;
the main control loop is connected with the main oil tank and the first hydraulic pump and is provided with a high-pressure overflow loop;
the actuating mechanism is arranged on the main control loop;
the three-way flow valve is provided with a first oil port, a second oil port and an external control port, the first oil port is connected with the pump outlet of the first hydraulic pump, the second oil port is connected with the main oil tank, the external control port is connected with the load sensitive control system, the set pressure of the external control port is greater than the control pressure of the load sensitive control system, and the pressure of the external control port is less than the overflow pressure of the high-pressure overflow loop.
2. The high-temperature prevention hydraulic system as claimed in claim 1, wherein the load-sensitive control system is provided with a load-sensitive control valve, a load feedback branch is provided between an oil inlet of the load-sensitive control valve and an oil inlet of the actuator, and the external control port is connected to the load feedback branch.
3. The high temperature prevention hydraulic system of claim 2, wherein the load sensitive control system is provided with a third check valve on the load feedback branch that is in one-way communication with the load sensitive control valve.
4. The hydraulic system for preventing high temperature according to claim 1, wherein the main control circuit is provided with a main oil inlet path and a main oil return path, a first check valve for connection is arranged between the pump outlet of the first hydraulic pump and the main oil inlet path, the first check valve is in one-way conduction along the outlet direction of the pressure oil pump of the first hydraulic pump, and the first oil port is arranged near the oil outlet end of the first check valve.
5. The hydraulic system for preventing high temperature according to claim 4, wherein the oil outlet end of the first check valve is provided with a monitoring structure.
6. The hydraulic system for preventing high temperatures according to claim 5, characterized in that the monitoring structure is provided with a pressure control switch.
7. The high temperature prevention hydraulic system as claimed in claim 1, wherein a second hydraulic pump is further provided in parallel with the first hydraulic pump on the main control circuit for supplying oil in an emergency state.
8. The hydraulic system for preventing high temperature according to claim 7, wherein a second check valve is disposed at the pump outlet of the second hydraulic pump, the second check valve is in one-way communication along the outlet direction of the hydraulic pump of the second hydraulic pump, and the first oil port is disposed near the oil outlet end of the second check valve.
9. The high temperature prevention hydraulic system as recited in claim 1 wherein the actuator is provided with a luffing actuator assembly and a slewing actuator assembly in parallel on the main control circuit.
10. The hydraulic system for preventing high temperature according to claim 1, wherein a main overflow valve is arranged on the high-pressure overflow circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076344.2A CN112324728A (en) | 2020-10-10 | 2020-10-10 | Hydraulic system capable of preventing high temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076344.2A CN112324728A (en) | 2020-10-10 | 2020-10-10 | Hydraulic system capable of preventing high temperature |
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| Publication Number | Publication Date |
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| CN112324728A true CN112324728A (en) | 2021-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011076344.2A Pending CN112324728A (en) | 2020-10-10 | 2020-10-10 | Hydraulic system capable of preventing high temperature |
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| CN (1) | CN112324728A (en) |
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Application publication date: 20210205 |