CN209781353U - Hydraulic system with pressure reducing valve failure protection function and agricultural machine - Google Patents
Hydraulic system with pressure reducing valve failure protection function and agricultural machine Download PDFInfo
- Publication number
- CN209781353U CN209781353U CN201920675342.1U CN201920675342U CN209781353U CN 209781353 U CN209781353 U CN 209781353U CN 201920675342 U CN201920675342 U CN 201920675342U CN 209781353 U CN209781353 U CN 209781353U
- Authority
- CN
- China
- Prior art keywords
- valve
- pressure
- rod
- outlet
- failure protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Fluid-Pressure Circuits (AREA)
Abstract
The utility model relates to a hydraulic system and agricultural machine with relief pressure valve failure protection, include: the failure protection valve is arranged between the pressure reducing valve and the actuating element; the pressure switch is arranged on an outlet pipeline of the pressure reducing valve and is electrically connected with the failure protection valve to enable the failure protection valve to be switched between a first working state and a second working state; when the failure protection valve is in a first working state, an outlet of the pressure reducing valve is communicated with an inlet of the actuating element; when the failure protection valve is in second operating condition, the export of relief pressure valve and the oil return opening of oil tank intercommunication, the utility model discloses a set up pressure switch and failure protection valve and can protect relief pressure valve low reaches execute component, avoid damage spare part after low reaches pressure risees, and then avoid causing personnel's injury.
Description
Technical Field
The utility model relates to a hydraulic pressure field especially relates to a hydraulic system and agricultural machine with relief pressure valve failure protection.
Background
The pressure reducing valve is a valve device which enables outlet pressure to be lower than inlet pressure and enables outlet pressure to be basically constant, the pressure reducing valve is widely applied to the field of fluid and is suitable for various types of air pressure and hydraulic equipment, the inlet pressure of the currently used pressure reducing valve is generally directly connected to a high-pressure system, the pressure is generally higher, the currently used system with the pressure reducing valve only considers whether the pressure after the pressure reducing valve is reduced is stable and optimized in the aspect of structure, once the pressure reducing valve fails, only a warning prompt is given, no good coping scheme is provided for protecting downstream parts, the inlet and the outlet of the pressure reducing valve are directly communicated, the downstream pressure is increased, the downstream parts are directly damaged, personnel injury can be seriously caused, the number of application occasions of the pressure reducing valve is large, and no good solution is provided for the problem caused.
the prior art has the following disadvantages:
1) The pressure before the pressure reduction of the pressure reducing valve is larger than the pressure after the pressure reduction, the pressure before the pressure reduction is generally higher, and if the pressure reducing valve fails, the downstream pressure is increased, and the downstream parts are directly damaged.
2) after the pressure reducing valve fails, only an alarm can be prompted, and downstream components cannot be effectively protected.
2) After the pressure reducing valve fails, if the pressure resistance of a downstream part is low, parts are directly damaged, and personnel are seriously injured.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to prior art not enough, provide a hydraulic system and agricultural machinery with relief pressure valve fail safe to solve at least one of above-mentioned technical problem.
On the one hand, the utility model provides a technical scheme as follows of above-mentioned technical problem: a hydraulic system having pressure relief valve failure protection, comprising:
The inlet of the pressure reducing valve is communicated with high-pressure oil, and the outlet of the pressure reducing valve is connected with an executing element through a pipeline;
The failure protection valve is arranged between the pressure reducing valve and the actuator;
The pressure switch is arranged on an outlet pipeline of the pressure reducing valve and is electrically connected with the failure protection valve to enable the failure protection valve to be switched between a first working state and a second working state;
When the failure protection valve is in a first working state, an outlet of the pressure reducing valve is communicated with an inlet of the actuating element; when the failure protection valve is in the second working state, the outlet of the pressure reducing valve is communicated with the oil return port of the oil tank.
The utility model has the advantages that: the high-pressure at the inlet of the reducing valve is reduced into low-pressure at the outlet of the reducing valve through the reducing valve, and the low-pressure is supplied to a downstream actuating element to realize the normal work of the actuating element; the failure protection valve is arranged between the pressure reducing valve and the actuating element, when the pressure reducing valve works normally, the failure protection valve is in a first working state, an outlet of the pressure reducing valve is communicated with an inlet of the actuating element, when the pressure reducing valve fails and cannot play a role of reducing pressure, the outlet of the pressure reducing valve is directly communicated with the inlet of the pressure reducing valve, the pressure on the downstream of the outlet of the pressure reducing valve rises, at the moment, the failure protection valve is started and switched to a second working state, pressure oil on the downstream of the pressure reducing valve directly returns to the oil tank, and the downstream actuating element is protected; detecting the pressure at the downstream of the outlet of the pressure reducing valve through a pressure switch, alarming when the pressure exceeds a set value, and starting the failure protection valve to switch the failure protection valve from a first working state to a second working state; the utility model discloses a set up pressure switch and failure protection valve and can protect relief pressure valve low reaches executive component, avoid the low reaches pressure to damage spare part after rising, and then avoid causing personnel's injury.
on the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the failure protection valve is a normally closed two-position three-way electromagnetic valve and comprises a first inlet, a first outlet and a second outlet, the first inlet is communicated with an outlet of the pressure reducing valve, the first outlet is communicated with the executing element, and the second outlet is communicated with an oil return port of the oil tank.
The beneficial effect of adopting the further scheme is that: under the condition of power failure, the first inlet is communicated with the first outlet, which is a first working state of the two-position three-way electromagnetic valve, and in the first working state, the outlet of the pressure reducing valve is communicated with the execution element through the failure protection valve to realize oil supply and pressure supply, and the failure protection valve serves as a pipeline passage at the moment; under the circumstances of circular telegram, first import switches on with the second export, and this is two-position three way solenoid valve's second operating condition, when second operating condition, is truncated by the failure protection valve between the export of relief pressure valve and the executive component, and the export of relief pressure valve switches on through failure protection valve and oil tank, and the pressure oil in relief pressure valve low reaches directly returns the oil tank, and protection low reaches executive component does not receive the damage, the utility model discloses direct two-position three way solenoid valve of installing on original pipeline can realize the route of relief pressure valve normal during operation and the protection when the relief pressure valve became invalid, easy operation, the realization of being convenient for.
Furthermore, the actuating element is a single-rod double-acting piston cylinder, a rod cavity of the single-rod double-acting piston cylinder is communicated with the first outlet, and a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return opening of the oil tank or a rod cavity of the single-rod double-acting piston cylinder.
The beneficial effect of adopting the further scheme is that: when the rod-containing cavity of the single-rod double-acting piston cylinder is communicated with the rod-containing cavity of the single-rod double-acting piston cylinder, differential connection is realized, and the piston realizes rapid movement; when a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return port of an oil tank, the pressure of a rod cavity always exists, and the quick reset of the oil cylinder is realized.
Furthermore, the number of the actuating elements is two, the actuating elements are arranged in parallel and are respectively a single-rod double-acting piston cylinder and a single-rod single-acting piston cylinder, and the first outlet is respectively connected with a rod cavity of the single-rod double-acting piston cylinder and a working cavity of the single-rod single-acting piston cylinder through a pipeline; and a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return port of an oil tank or a rod cavity of the single-rod double-acting piston cylinder.
the beneficial effect of adopting the further scheme is that: when the rod-containing cavity of the single-rod double-acting piston cylinder is communicated with the rod-containing cavity of the single-rod double-acting piston cylinder, differential connection is realized, and the piston realizes rapid movement; when a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return port of an oil tank, the pressure of a rod cavity always exists, and the quick reset of the oil cylinder is realized; the single-rod single-action piston cylinder is driven by hydraulic pressure in one direction.
The single-rod double-acting piston cylinder is characterized by further comprising a switch valve, and when the switch valve is closed, a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return port of the oil tank; when the switch valve is opened, the rodless cavity of the single-rod double-acting piston cylinder is communicated with the rod cavity of the single-rod double-acting piston cylinder.
The beneficial effect of adopting the further scheme is that: the action and the reset of the single-rod double-acting piston cylinder are realized through the switch valve, when the switch valve is opened, a rodless cavity of the single-rod double-acting piston cylinder is communicated with a rod cavity of the single-rod double-acting piston cylinder, the differential connection is realized, and the piston realizes the rapid movement; when the switch valve is closed, the rodless cavity is connected with the oil tank, and the pressure of the rod cavity exists all the time, so that the quick reset of the oil cylinder is realized.
Further, the switch valve is a normally open two-position three-way electromagnetic valve, the switch valve comprises a second inlet, a third outlet and a fourth outlet, the second inlet is communicated with a rodless cavity of the single-rod double-acting piston cylinder, the third outlet is communicated with an oil return opening of the oil tank, and the fourth outlet is communicated with a rod cavity of the single-rod double-acting piston cylinder.
The beneficial effect of adopting the further scheme is that: when the power is off, the second inlet is communicated with the third outlet, the rod cavity is filled with oil, the rodless cavity is communicated with the oil tank, and the rod cavity is small in effective acting area, small in thrust and high in speed when filled with oil; when the piston is electrified, the second inlet is communicated with the fourth outlet, the rod cavity and the rodless cavity are simultaneously communicated with pressure oil, the thrust acting on the two end faces of the piston is unequal to generate a thrust difference, the piston moves under the action of the thrust difference, and at the moment, the oil discharged from the rod cavity also enters the rodless cavity to enable the piston to rapidly move and realize differential connection.
Further, the actuator is a single-rod single-acting piston cylinder, and a working cavity of the single-rod single-acting piston cylinder is communicated with the first outlet.
The beneficial effect of adopting the further scheme is that: the single-rod single-action piston cylinder is driven by hydraulic pressure in one direction.
Further, the executive component is a plurality of and is arranged in parallel.
The beneficial effect of adopting the further scheme is that: a plurality of actuating elements can be connected in parallel at the downstream of the pressure reducing valve, a failure protection valve is arranged on a parallel bus, when the pressure reducing valve fails, the plurality of actuating elements at the downstream can be protected through one failure protection valve, the actuating elements are connected in parallel, and the actuating elements are not influenced by each other during working.
Further, pressure switch includes pressure sensor, alarm and control switch, and pressure sensor sets up the outlet pipeline of relief pressure valve, and alarm and control switch are connected with pressure sensor respectively, and control switch is connected with the fail-safe valve electricity.
The beneficial effect of adopting the further scheme is that: the alarm is connected with the pressure sensor, and starts alarming and prompts when the pressure sensor detects that the pressure of the outlet of the pressure reducing valve exceeds a preset value; the control switch is connected with the pressure sensor, when the pressure sensor detects that the pressure of the outlet of the pressure reducing valve exceeds a preset value, the control switch controls the failure protection valve to be opened, the first working state is switched to the second working state, a passage between the pressure reducing valve and the actuating element is cut off, and the downstream actuating element is protected.
on the other hand, the utility model also provides an agricultural machine, including the above-mentioned hydraulic system who has relief pressure valve failure protection.
The beneficial effect who adopts above-mentioned scheme is: the scheme has all the beneficial effects of the hydraulic system with the pressure reducing valve failure protection function, and is not repeated herein.
drawings
Fig. 1 is the schematic diagram of the hydraulic system of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a single-rod double-acting piston cylinder, 2 single-rod single-acting piston cylinders, 3 pressure switches, 4 pressure reducing valves, 5 failure protection valves, 6 switch valves.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, a hydraulic system with a pressure reducing valve 4 failure protection comprises:
the inlet of the pressure reducing valve 4 is communicated with high-pressure oil, and the outlet of the pressure reducing valve 4 is connected with an actuating element through a pipeline;
A fail-safe valve 5, the fail-safe valve 5 being disposed between the pressure reducing valve 4 and the actuator;
The pressure switch 3 is arranged on an outlet pipeline of the pressure reducing valve 4 and is electrically connected with the failure protection valve 5, so that the failure protection valve 5 is switched between a first working state and a second working state;
When the failure protection valve 5 is in a first working state, the outlet of the pressure reducing valve 4 is communicated with the inlet of the actuator; when the failure protection valve 5 is in the second working state, the outlet of the pressure reducing valve 4 is communicated with the oil return port of the oil tank.
The beneficial effect of this embodiment is: the high-pressure at the inlet of the pressure reducing valve 4 is reduced into the low-pressure at the outlet of the pressure reducing valve 4 by the pressure reducing valve 4, and the low-pressure is supplied to a downstream actuator so as to realize the normal work of the actuator; the failure protection valve 5 is arranged between the pressure reducing valve 4 and the actuating element, when the pressure reducing valve 4 works normally, the failure protection valve 5 is in a first working state, an outlet of the pressure reducing valve 4 is communicated with an inlet of the actuating element, when the pressure reducing valve 4 fails and cannot perform pressure reducing function, the outlet of the pressure reducing valve 4 is directly communicated with the inlet of the pressure reducing valve 4, the pressure of the downstream of the outlet of the pressure reducing valve 4 rises, at the moment, the failure protection valve 5 is started and switched to a second working state, pressure oil on the downstream of the pressure reducing valve 4 directly returns to the oil tank, and the downstream actuating element is protected from being damaged; the pressure at the downstream of the outlet of the pressure reducing valve 4 is detected through the pressure switch 3, when the pressure exceeds a set value, an alarm prompt is given, and meanwhile, the failure protection valve 5 is started, so that the failure protection valve 5 is switched from a first working state to a second working state; the utility model discloses a set up pressure switch 3 and failure protection valve 5 and can protect 4 low reaches executive component of relief pressure valve, avoid damage spare part after low reaches pressure risees, and then avoid causing personnel's injury.
Example 2
As shown in fig. 1, a hydraulic system with a pressure reducing valve 4 failure protection comprises:
The inlet of the pressure reducing valve 4 is communicated with high-pressure oil, and the outlet of the pressure reducing valve 4 is connected with an actuating element through a pipeline;
A fail-safe valve 5, the fail-safe valve 5 being disposed between the pressure reducing valve 4 and the actuator;
The pressure switch 3 is arranged on an outlet pipeline of the pressure reducing valve 4 and is electrically connected with the failure protection valve 5, so that the failure protection valve 5 is switched between a first working state and a second working state;
When the failure protection valve 5 is in a first working state, the outlet of the pressure reducing valve 4 is communicated with the inlet of the actuator; when the failure protection valve 5 is in the second working state, the outlet of the pressure reducing valve 4 is communicated with the oil return port of the oil tank.
The high-pressure at the inlet of the pressure reducing valve 4 is reduced into the low-pressure at the outlet of the pressure reducing valve 4 by the pressure reducing valve 4, and the low-pressure is supplied to a downstream actuator so as to realize the normal work of the actuator; the failure protection valve 5 is arranged between the pressure reducing valve 4 and the actuating element, when the pressure reducing valve 4 works normally, the failure protection valve 5 is in a first working state, an outlet of the pressure reducing valve 4 is communicated with an inlet of the actuating element, when the pressure reducing valve 4 fails and cannot perform pressure reducing function, the outlet of the pressure reducing valve 4 is directly communicated with the inlet of the pressure reducing valve 4, the pressure of the downstream of the outlet of the pressure reducing valve 4 rises, at the moment, the failure protection valve 5 is started and switched to a second working state, pressure oil on the downstream of the pressure reducing valve 4 directly returns to the oil tank, and the downstream actuating element is protected from being damaged; the pressure at the downstream of the outlet of the pressure reducing valve 4 is detected through the pressure switch 3, when the pressure exceeds a set value, an alarm prompt is given, and meanwhile, the failure protection valve 5 is started, so that the failure protection valve 5 is switched from a first working state to a second working state; the utility model discloses a set up pressure switch 3 and failure protection valve 5 and can protect 4 low reaches executive component of relief pressure valve, avoid damage spare part after low reaches pressure risees, and then avoid causing personnel's injury.
Preferably, the failure protection valve 5 is a normally closed two-position three-way electromagnetic valve, and includes a first inlet, a first outlet and a second outlet, the first inlet is communicated with the outlet of the pressure reducing valve 4, the first outlet is communicated with the actuator, and the second outlet is communicated with the oil return port of the oil tank.
Under the condition of power failure, the first inlet is communicated with the first outlet, which is a first working state of the two-position three-way electromagnetic valve, and in the first working state, the outlet of the pressure reducing valve 4 is communicated with the execution element through the failure protection valve 5 to realize oil supply and pressure supply, and at the moment, the failure protection valve 5 serves as a pipeline passage; under the circumstances of circular telegram, first import switches on with the second export, this second operating condition for two-position three way solenoid valve, when second operating condition, is truncated by failure protection valve 5 between the export of relief pressure valve 4 and the executive component, and the export of relief pressure valve 4 switches on through failure protection valve 5 and oil tank, and the pressure oil in relief pressure valve 4 low reaches directly returns the oil tank, protects low reaches executive component not damaged, the utility model discloses direct two-position three way solenoid valve is installed on original pipeline and the protection when can realize the route of relief pressure valve 4 normal during operation and relief pressure valve 4 inefficacy, easy operation, the realization of being convenient for.
In some embodiments, the actuator is a single-rod double-acting piston cylinder 1, the rod cavity of the single-rod double-acting piston cylinder 1 is communicated with the first outlet, and the rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with the oil return opening of the oil tank or the rod cavity of the single-rod double-acting piston cylinder 1.
when the rod cavity of the single-rod double-acting piston cylinder 1 is communicated with the first outlet all the time, the differential connection is realized and the piston moves quickly when the rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with the rod cavity of the single-rod double-acting piston cylinder 1; when a rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with an oil return port of an oil tank, the pressure of a rod cavity exists all the time, and the quick resetting of the oil cylinder is realized, so that the single-rod double-acting piston cylinder 1 is quickly reset, and the single-rod double-acting piston cylinder 1 is quickly reset.
In the present embodiment, as shown in fig. 1, the number of the actuators is two and the actuators are arranged in parallel, and are respectively a single-rod double-acting piston cylinder 1 and a single-rod single-acting piston cylinder 2, and the first outlets are respectively connected with the rod cavity of the single-rod double-acting piston cylinder 1 and the working cavity of the single-rod single-acting piston cylinder 2 through pipelines; and a rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with an oil return port of an oil tank or a rod cavity of the single-rod double-acting piston cylinder 1.
When the rod cavity of the single-rod double-acting piston cylinder 1 is communicated with the first outlet all the time, the differential connection is realized and the piston moves quickly when the rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with the rod cavity of the single-rod double-acting piston cylinder 1; when a rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with an oil return port of an oil tank, rod cavity pressure always exists, and the quick resetting of the oil cylinder is realized, so that the single-rod double-acting piston cylinder 1 is quickly reset, and the single-rod double-acting piston cylinder 1 is quickly reset; the single-rod single-action piston cylinder 2 is driven by hydraulic pressure in one direction.
preferably, the device also comprises a switch valve 6, and when the switch valve 6 is closed, a rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with an oil return port of the oil tank; when the switch valve 6 is opened, the rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with the rod cavity of the single-rod double-acting piston cylinder 1.
The action and the reset of the single-rod double-acting piston cylinder 1 are realized through the switch valve 6, when the switch valve 6 is opened, a rodless cavity of the single-rod double-acting piston cylinder 1 is communicated with a rod cavity of the single-rod double-acting piston cylinder 1, the differential connection is realized, and the piston realizes the rapid movement; when the switch valve 6 is closed, the rodless cavity is connected with the oil tank, and the pressure of the rod cavity exists all the time, so that the quick reset of the oil cylinder is realized.
Specifically, the switch valve 6 is a normally open two-position three-way electromagnetic valve, the switch valve 6 comprises a second inlet, a third outlet and a fourth outlet, the second inlet is communicated with a rodless cavity of the single-rod double-acting piston cylinder 1, the third outlet is communicated with an oil return port of the oil tank, and the fourth outlet is communicated with a rod cavity of the single-rod double-acting piston cylinder 1.
when the power is off, the second inlet is communicated with the third outlet, the rod cavity is filled with oil, the rodless cavity is communicated with the oil tank, and the rod cavity is small in effective acting area, small in thrust and high in speed when filled with oil; when the piston is electrified, the second inlet is communicated with the fourth outlet, the rod cavity and the rodless cavity are simultaneously communicated with pressure oil, the thrust acting on the two end faces of the piston is unequal to generate a thrust difference, the piston moves under the action of the thrust difference, and at the moment, the oil discharged from the rod cavity also enters the rodless cavity to enable the piston to rapidly move and realize differential connection.
it should be noted that when the on-off valve 6 is opened, the oil enters from the fourth outlet and then flows out from the second inlet; when the on-off valve 6 is closed, oil flows in from the second inlet and flows out from the third outlet.
In other embodiments, the actuator is a single-rod, single-acting piston cylinder 2, and the working chamber of the single-rod, single-acting piston cylinder 2 communicates with the first outlet.
the single-rod single-action piston cylinder 2 is driven by hydraulic pressure in one direction.
In some embodiments, the actuator is a plurality of actuators arranged in parallel.
A plurality of actuating elements can be connected in parallel at the downstream of the pressure reducing valve 4, the failure protection valve 5 is arranged on a parallel bus, when the pressure reducing valve 4 fails, the downstream actuating elements can be protected through one failure protection valve 5, the actuating elements are connected in parallel, and the actuating elements do not influence each other during working. It should be noted that the actuator is not limited to the single-rod double-acting piston cylinder 1 and the single-rod single-acting piston cylinder 2 specifically disclosed in the present embodiment.
The pressure switch 3 comprises a pressure sensor, an alarm and a control switch, the pressure sensor is provided with an outlet pipeline of the pressure reducing valve 4, the alarm and the control switch are respectively connected with the pressure sensor, and the control switch is electrically connected with the failure protection valve 5.
specifically, in the embodiment, the pressure switch 3 is connected in parallel with the actuator and arranged in a downstream pipeline of the first outlet of the fail-safe valve 5, the alarm is connected with the pressure sensor, and when the pressure sensor detects that the pressure at the outlet of the pressure reducing valve 4 exceeds a preset value, the alarm starts to give an alarm for prompting; the control switch is connected with the pressure sensor, when the pressure sensor detects that the pressure of the outlet of the pressure reducing valve 4 exceeds a preset value, the control switch controls the failure protection valve 5 to be opened, the first working state is switched to the second working state, a passage between the pressure reducing valve 4 and the actuating element is cut off, and the downstream actuating element is protected.
Specifically, the pressure switch 3 adopts a high-precision and high-stability pressure sensor and a transmitting circuit, and then realizes detection, display, alarm and control signal output of medium pressure signals through a special CPU modular signal processing technology. The pressure switch 3 can be widely used for measuring and controlling the gauge pressure and absolute pressure of various gases and liquids in the fields of petroleum, chemical industry, metallurgy, electric power, water supply and the like, and is an ideal intelligent measuring and controlling instrument for industrial fields. The pressure switch 3 is widely used in the aerospace and military fields, such as M1A1 tank, Apollo airship, Boeing 747, airbus A320, F22, F117 and other products.
In this embodiment, the pressure switch 3 is the pressure switch 3 of the MHR01500BBPNMABA in the existing model.
As shown in fig. 1, the present embodiment includes a single-rod double-acting piston cylinder 1, a single-rod single-acting piston cylinder 2, a pressure switch 3, a pressure reducing valve 4, and a fail-safe valve 5. Firstly, high-pressure oil enters from a port P, is decompressed by a decompression valve 4, is constant at a set pressure value of the decompression valve 4, and is transmitted to a rod cavity of a single-rod double-acting piston cylinder 1, the single-rod single-acting piston cylinder 2, a pressure switch 3, the single-rod double-acting piston cylinder 1 and the single-rod single-acting piston cylinder 2 through a failure protection valve 5 to realize normal operation.
The failure protection valve 5 does not need to act under the condition that the pressure in the system is normal, in order to ensure that the failure protection valve 5 can act normally after the pressure reducing valve 4 fails, the failure protection valve 5 is electrified after the machine is started to ensure that the failure protection valve can work normally, and the power is cut off after 3S, the middle position is recovered, and the normal use of downstream parts is ensured.
when the failure protection valve 5 fails, if the downstream pressure is rapidly increased, the pressure switch 3 detects that the system pressure exceeds a set value, an alarm prompt is sent out, meanwhile, the failure protection valve 5 is electrified, the downstream pressure is rapidly cut off, and downstream parts are effectively protected from being damaged.
The beneficial effect of this embodiment is: this embodiment has all the advantageous effects of embodiment 1.
Example 3
An agricultural machine comprising a hydraulic system as described above with a pressure relief valve 4 fail safe.
The beneficial effect of this embodiment is: the scheme has all the beneficial effects of the hydraulic system with the pressure reducing valve 4 failure protection function, and the detailed description is omitted.
In the description herein, reference to the terms "embodiment one," "embodiment two," "example," "specific example," or "some examples," etc., means that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. a hydraulic system having pressure relief valve failure protection, comprising:
The inlet of the pressure reducing valve is communicated with high-pressure oil, and the outlet of the pressure reducing valve is connected with an executing element through a pipeline;
A fail-safe valve disposed between the pressure relief valve and the actuator;
The pressure switch is arranged on an outlet pipeline of the pressure reducing valve and is electrically connected with the failure protection valve to enable the failure protection valve to be switched between a first working state and a second working state;
When the failure protection valve is in a first working state, an outlet of the pressure reducing valve is communicated with an inlet of the actuating element; and when the failure protection valve is in a second working state, the outlet of the pressure reducing valve is communicated with the oil return port of the oil tank.
2. The hydraulic system with pressure reducing valve failure protection as recited in claim 1, wherein the failure protection valve is a normally closed two-position three-way solenoid valve including a first inlet, a first outlet and a second outlet, the first inlet is in communication with the outlet of the pressure reducing valve, the first outlet is in communication with the actuator, and the second outlet is in communication with the oil return port of the oil tank.
3. The hydraulic system of claim 2, wherein the actuator is a single-rod, double-acting piston cylinder, a rod cavity of the single-rod, double-acting piston cylinder being in communication with the first outlet, and a rodless cavity of the single-rod, double-acting piston cylinder being in communication with an oil return port of the oil tank or a rod cavity of the single-rod, double-acting piston cylinder.
4. the hydraulic system with pressure reducing valve failure protection as recited in claim 2, wherein the number of the actuators is two and arranged in parallel, being a single-rod double-acting piston cylinder and a single-rod single-acting piston cylinder, respectively, and the first outlet is connected to the rod chamber of the single-rod double-acting piston cylinder and the working chamber of the single-rod single-acting piston cylinder, respectively, through a pipe; and a rodless cavity of the single-rod double-acting piston cylinder is communicated with an oil return port of the oil tank or a rod cavity of the single-rod double-acting piston cylinder.
5. The hydraulic system with pressure reducing valve failure protection as claimed in claim 3 or 4, further comprising an on-off valve, wherein when the on-off valve is closed, the rodless cavity of the single-rod double-acting piston cylinder is communicated with the oil return port of the oil tank; when the switch valve is opened, the rodless cavity of the single-rod double-acting piston cylinder is communicated with the rod cavity of the single-rod double-acting piston cylinder.
6. The hydraulic system with pressure reducing valve failure protection as recited in claim 5, wherein the switch valve is a normally open two-position three-way solenoid valve, the switch valve including a second inlet, a third outlet, and a fourth outlet, the second inlet communicating with the rodless chamber of the single-rod, double-acting piston cylinder, the third outlet communicating with the oil return port of the oil tank, and the fourth outlet communicating with the rod chamber of the single-rod, double-acting piston cylinder.
7. The hydraulic system as recited in claim 2 wherein the actuator is a single-rod, single-acting piston cylinder, the working chamber of which communicates with the first outlet.
8. the hydraulic system with pressure relief valve failure protection as recited in claim 1 wherein the actuator is plural and arranged in parallel.
9. The hydraulic system with pressure reducing valve failure protection as claimed in claim 1, wherein the pressure switch comprises a pressure sensor, an alarm and a control switch, the pressure sensor is provided with an outlet pipeline of the pressure reducing valve, the alarm and the control switch are respectively connected with the pressure sensor, and the control switch is electrically connected with the failure protection valve.
10. An agricultural machine comprising a hydraulic system with pressure relief valve failure protection as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920675342.1U CN209781353U (en) | 2019-05-13 | 2019-05-13 | Hydraulic system with pressure reducing valve failure protection function and agricultural machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920675342.1U CN209781353U (en) | 2019-05-13 | 2019-05-13 | Hydraulic system with pressure reducing valve failure protection function and agricultural machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209781353U true CN209781353U (en) | 2019-12-13 |
Family
ID=68805133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920675342.1U Active CN209781353U (en) | 2019-05-13 | 2019-05-13 | Hydraulic system with pressure reducing valve failure protection function and agricultural machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209781353U (en) |
-
2019
- 2019-05-13 CN CN201920675342.1U patent/CN209781353U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202267609U (en) | Aircraft landing gear loading system | |
| US7322270B2 (en) | Safety circuit for media-operated consumers and process for its operation | |
| US7198065B2 (en) | Valve arrangement | |
| CN101482190B (en) | Controlled security pressure relieving apparatus with pneumatic assisting apparatus | |
| CN109268347B (en) | Generator set and steam turbine interruption early warning system thereof | |
| CN105134684B (en) | Logic oil duct control system with electromagnetic switch valves and failure autodiagnosis method | |
| CN103398862A (en) | Testing method of linear valve pneumatic actuator | |
| CN103362492A (en) | Method and system for controlling seating of rotary drilling rig mast | |
| CN103629421A (en) | Valve control system | |
| CN209781353U (en) | Hydraulic system with pressure reducing valve failure protection function and agricultural machine | |
| CN103994111B (en) | A kind of hydraulic bolt lift platform hydraulic control system | |
| CN201496345U (en) | Pipeline bursting online security continuous work system of hydraulic equipment | |
| CN201106594Y (en) | Electrohydraulic reversing valve containing unit for detecting valve core position | |
| CN102493916A (en) | Off-course hydraulic braking device of wind generating set | |
| CN203548161U (en) | Device for keeping control position of scoop tube of feed pump | |
| CN205877369U (en) | A controlling means for air piston formula actuating mechanism | |
| CN207676230U (en) | Fail-safe system for control valve | |
| CN205678247U (en) | Integrated flow sensors and the electromagnetic valve controlling system of pressure transducer | |
| CN202441539U (en) | Yaw hydraulic braking device of wind generating set | |
| CN104454787A (en) | Steering engine hydraulic state monitoring system and monitoring method | |
| CN109611396B (en) | Automatic oil supply switching hydraulic system and method for large-ladle sliding gate hydraulic cylinder | |
| CN106051281A (en) | Control device for pneumatic piston type executing mechanism | |
| CN101658926B (en) | Hydraulic control system of tundish water gap of continuous casting machine | |
| KR101085997B1 (en) | Safety Valve Bypass Element Guard | |
| CN211059452U (en) | Butterfly valve actuating mechanism safety interruption device and butterfly valve actuating mechanism thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee after: Weichai leiwo Heavy Industry Co.,Ltd. Address before: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee before: LOVOL HEAVY INDUSTRY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee after: Weichai Lovol Intelligent Agricultural Technology Co.,Ltd. Address before: 261206 No. 192 South Beihai Road, Fangzi District, Shandong, Weifang Patentee before: Weichai leiwo Heavy Industry Co.,Ltd. |