CN111267808A - Parking liquid filling system and method for loader - Google Patents
Parking liquid filling system and method for loader Download PDFInfo
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- CN111267808A CN111267808A CN202010124263.9A CN202010124263A CN111267808A CN 111267808 A CN111267808 A CN 111267808A CN 202010124263 A CN202010124263 A CN 202010124263A CN 111267808 A CN111267808 A CN 111267808A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
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Abstract
The invention relates to the technical field of engineering equipment, in particular to a parking liquid filling system and a parking liquid filling method for a loader.
Description
Technical Field
The invention relates to the technical field of engineering equipment, in particular to a parking liquid filling system and a parking liquid filling method for a loader.
Background
The loader requires a separate parking charging system to provide a source of pressure for the parking brake de-braking condition. In the parking liquid filling device in the prior art, hydraulic oil of a service braking system is used as a pressure oil source, a signal is sent to a three-way valve, the pressure oil source is pumped into an energy accumulator through a hydraulic pump, and then the high-pressure oil source in the energy accumulator enters a parking oil cylinder through the opening of a parking electromagnetic valve, so that a parking state is relieved.
The parking liquid charging system is only used for a short time when the parking state is released, the liquid charging valve group is integrated with the service brake liquid charging system, the hydraulic pump is always in a standby state, the power generated by an engine is wasted, and the hydraulic pump is easy to break down due to the fact that an extra power take-off port is required to be provided.
Disclosure of Invention
Aiming at the problems, the invention provides a parking liquid filling system and a parking liquid filling method for a loader, which can be used for canceling a hydraulic pump which is always in a standby state on the basis of not providing an additional power take-off port of the hydraulic pump, integrating a pressure oil source with a liquid filling function into a hydraulic system of a working device and realizing the separation of vehicle braking and parking braking.
One or more embodiments provide the following technical solutions:
a parking liquid filling system of a loader is characterized by comprising a liquid filling electromagnetic valve, a first pressure switch, a second pressure switch, an energy accumulator, a parking oil cylinder, a parking electromagnetic valve, a one-way valve, a throttle valve and a hydraulic control valve of a working device;
the outlet of the liquid filling electromagnetic valve is connected with an energy accumulator, a first pressure switch is connected with the energy accumulator, the energy accumulator is connected with a parking oil cylinder through a parking electromagnetic valve, a second pressure switch is connected with the parking oil cylinder, the inlet of the liquid filling electromagnetic valve is connected with a throttle valve, and the outlet of a hydraulic control valve of a working device is connected with the inlet of the liquid filling electromagnetic valve through a one-way valve;
the controller is connected with the first pressure switch and the second pressure switch, receives pressure signals fed back by the first pressure switch and the second pressure switch, is connected with the liquid filling electromagnetic valve and the parking electromagnetic valve at the same time, and sends opening and closing instructions to the liquid filling electromagnetic valve and the parking electromagnetic valve; the controller is also connected with a hydraulic pump of the working device and controls the hydraulic pump of the service braking system to switch the working state after receiving a signal fed back by the pressure switch.
The hydraulic control valve of the working device is also connected with a hydraulic pump of the working device, and the pressure oil source is provided by the hydraulic pump of the working device.
The pressure reducing valve is arranged on a pipeline between the outlet of the liquid filling solenoid valve and the accumulator.
The pressure settings of the first pressure switch and the second pressure switch differ by no more than 5%.
The method for realizing parking liquid filling of the system is characterized in that the engine is started, the first pressure switch detects that the pressure of the energy accumulator is insufficient, the controller controls the liquid filling electromagnetic valve to be opened, the hydraulic pump of the working device is changed from low pressure to high pressure, the high-pressure oil source is pumped into the energy accumulator through the one-way valve and the liquid filling electromagnetic valve, and when the set value of the first pressure switch is reached, the controller controls the liquid filling electromagnetic valve to be turned off after delaying for several seconds, and liquid filling is finished.
When the controller controls the parking electromagnetic valve to be opened, pressure oil in the energy accumulator enters the parking oil cylinder, and the parking state is released.
When the controller controls the parking electromagnetic valve to be closed, hydraulic oil of the parking oil cylinder returns oil and enters a parking state.
When the hydraulic oil is in a parking release state, if one of the first pressure switch and the second pressure switch detects that the parking pressure is lower than a set value, the hydraulic valve is controlled to be opened, the hydraulic pump of the working device is switched to a high-pressure standby state, and the pressure oil enters the energy accumulator through the pressure reducing valve to be charged.
When the pressure reaches the set value of the first pressure switch or the set value of the second pressure switch, the controller controls the liquid filling electromagnetic valve to be closed after delaying for several seconds, and liquid filling is finished.
When the pressure of the hydraulic system of the working device is greater than the set pressure values of the first pressure switch and the second pressure switch, the pressure reducing valve enables the pressure oil passing through the liquid filling solenoid valve to flow back to the oil tank, and active liquid filling is not triggered.
After the liquid filling is finished, the liquid filling electromagnetic valve is closed, and the throttle valve is opened to release the residual stress in the pipeline.
The one-way valve enables pressure oil to flow to the hydraulic filling electromagnetic valve only through the hydraulic control valve of the working device but not to flow reversely, and therefore the situation that the load sensitive valve of the hydraulic pump of the working device is short-circuited to trigger protection due to reverse connection of the high-pressure oil in the liquid filling process of the energy accumulator is avoided.
The above one or more technical solutions have the following beneficial effects:
1. the pressure oil source for parking liquid filling is provided by a service braking system and is changed into that provided by a working device, so that service braking and parking braking are separated, and the safety is improved on the basis of reducing energy consumption.
2. The parking liquid filling system is integrated into a working hydraulic system, the pressure of hydraulic oil fluctuates during normal operation of a working device, and active liquid filling cannot be triggered by a pressure reducing valve and a pressure switch.
3. A one-way valve is introduced behind a hydraulic control valve of the working device, so that the situation that a sensitive valve of a hydraulic pump load of the working device is short-circuited to trigger protection locking due to reverse connection of high-pressure oil in the liquid charging process is prevented.
4. A throttle valve is introduced at the tail end of an inlet pipeline of the liquid filling electromagnetic valve, so that the residual stress of the pipeline between the hydraulic valve of the working device and the liquid filling electromagnetic valve can be eliminated after liquid filling is finished, and the original hydraulic system of the working device is not influenced.
5. And an additional power take-off port is not required to be provided by a service brake hydraulic pump, so that the complexity of the system is reduced, and the failure rate is further reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic diagram of a system according to one or more embodiments of the invention.
In the figure: 1-a working device hydraulic pump, 2-a liquid filling electromagnetic valve, 3-a pressure reducing valve, 4-an energy accumulator, 5-a parking electromagnetic valve, 6-a first pressure switch, 7-a second pressure switch, 8-a parking oil cylinder, 9-a throttle valve and 10-a one-way valve.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The parking liquid charging system is used for releasing the parking state of the loader, the loader only needs to be operated for releasing the parking state before being started every time, the corresponding liquid charging system only acts in a short time, the standby state is realized in most of time, and in the prior art, as the brake systems (service brake and parking brake) share one set of hydraulic pump, and the pressure of hydraulic oil required for releasing the parking state is far greater than that of the hydraulic oil in the service brake operation, the shared hydraulic pump is always in the standby state for meeting the conditions required for parking liquid charging, the engine power is greatly wasted, and in addition, the hydraulic pump is required to provide an additional power taking port, so that the complexity of the system is increased.
The invention provides a parking liquid filling system of a loader as shown in figure 1, which is characterized by comprising a liquid filling electromagnetic valve 2, a first pressure switch 6, a second pressure switch 7, an energy accumulator 4, a parking oil cylinder 8, a parking electromagnetic valve 5, a one-way valve 10, a throttle valve 9 and a hydraulic control valve of a working device;
the outlet of the liquid filling electromagnetic valve 2 is connected with an energy accumulator 4, a first pressure switch 6 is connected with the energy accumulator 4, the energy accumulator 4 is connected with a parking oil cylinder 8 through a parking electromagnetic valve 5, a second pressure switch 7 is connected with the parking oil cylinder 8, the inlet of the liquid filling electromagnetic valve 2 is connected with a throttle valve 9, and the outlet of the hydraulic control valve of the working device is connected with the inlet of the liquid filling electromagnetic valve 2 through a one-way valve 10;
the controller is connected with the first pressure switch and the second pressure switch, receives pressure signals fed back by the first pressure switch and the second pressure switch, is connected with the liquid filling electromagnetic valve and the parking electromagnetic valve at the same time, and sends opening and closing instructions to the liquid filling electromagnetic valve and the parking electromagnetic valve; the controller is also connected with a hydraulic pump of the working device and controls the hydraulic pump of the service braking system to convert the working state after receiving a signal fed back by the pressure switch; the pressure settings of the first pressure switch 6 and the second pressure switch 7 are set to differ by no more than 5%.
The hydraulic control valve of the working device is also connected with a hydraulic pump of the working device, and the pressure oil source is provided by the hydraulic pump of the working device.
The working device is a device consisting of an excavator bucket, a mechanical arm and a hydraulic oil cylinder which are used when the loader carries out loading operation, the device is provided with hydraulic oil by an independent hydraulic pump, and the hydraulic oil is distributed to a plurality of oil cylinders at different positions through the hydraulic control valve of the working device so that the excavator bucket of the loader generates different actions to realize the operations of loading, digging, stacking and the like; the hydraulic pump can provide an extremely high pressure oil source during the operation process of the loader, the corresponding operation process of the loader is complicated, and the pressure of the pressure oil source generated by the hydraulic pump has a large fluctuation range.
The pressure oil source of the parking liquid charging system is provided by the working device, so that the parking liquid charging system is completely separated from the original service brake, the safety and the energy consumption are improved, and the pressure reducing valve arranged on the pipeline between the outlet of the liquid charging solenoid valve and the energy accumulator is introduced to deal with the pressure fluctuation condition of the hydraulic pump of the working device.
The control method based on the system comprises the following steps:
when the engine is started, when the first pressure switch 6 detects that the pressure of the energy accumulator 4 is insufficient, the controller controls the liquid filling electromagnetic valve 2 to be opened, the hydraulic pump of the working device is switched from low-pressure standby to high-pressure standby, a high-pressure oil source is pumped into the energy accumulator 4 through the one-way valve 10 and the liquid filling electromagnetic valve 2, and when the set value of the first pressure switch 6 is reached, the controller controls the liquid filling electromagnetic valve 2 to be turned off after delaying for several seconds, and liquid filling is completed.
When the controller controls the parking electromagnetic valve 5 to be opened, pressure oil in the energy accumulator 4 enters the parking oil cylinder 8, and the parking state is released.
When the controller controls the parking electromagnetic valve 5 to be closed, hydraulic oil of the parking oil cylinder 8 returns to the oil tank and enters a parking state.
When the hydraulic oil is in the parking release state, if one of the first pressure switch 6 and the second pressure switch 7 detects that the parking pressure is lower than a set value, the liquid filling electromagnetic valve 2 is opened, the hydraulic pump of the working device is switched to a high-pressure standby state, and the pressure oil enters the accumulator 4 through the pressure reducing valve 3 to be filled.
When the pressure reaches the set value of the first pressure switch 6 or the set value of the second pressure switch 7, the controller controls the liquid filling electromagnetic valve to close after delaying for several seconds, and liquid filling is finished.
When the pressure of the hydraulic system of the working device is higher than the set pressure of the first pressure switch 6 and the second pressure switch 7 due to fluctuation, the pressure reducing valve 3 enables the pressure oil passing through the liquid filling electromagnetic valve 2 to return to the oil tank, and active liquid filling is not triggered.
After the liquid filling is finished, the liquid filling electromagnetic valve 2 is closed, and the throttle valve 9 is opened to release the residual stress in the pipeline.
The one-way valve 10 enables pressure oil to flow to the liquid filling electromagnetic valve 2 only through the hydraulic control valve of the working device and not to flow reversely, and therefore the load sensitive valve of the hydraulic pump of the working device is prevented from being short-circuited to trigger protection when parking and liquid filling are carried out.
According to the invention, the pressure oil source for parking liquid filling is provided by the service braking system instead of the working device, so that the service braking and the parking braking are separated, and the safety is improved on the basis of reducing the energy consumption.
The parking liquid filling system is integrated into a working hydraulic system, the pressure of hydraulic oil fluctuates during normal operation of a working device, and active liquid filling cannot be triggered by introducing a pressure reducing valve.
A one-way valve is introduced behind a hydraulic control valve of the working device, so that the situation that a sensitive valve of a hydraulic pump load of the working device is short-circuited to trigger protection locking due to reverse connection of high-pressure oil in the liquid charging process is prevented.
A throttle valve is introduced at the tail end of an inlet pipeline of the liquid filling electromagnetic valve, so that the residual stress of the pipeline between the hydraulic valve of the working device and the liquid filling electromagnetic valve can be eliminated after liquid filling is finished, and the original hydraulic system of the working device is not influenced.
The service brake hydraulic pump is not required to provide an additional power take-off port, so that the complexity of the system is reduced, and the failure rate is further reduced; meanwhile, the hydraulic pump of the working device does not need an additional power take-off port, and only the additional power take-off port is arranged on the hydraulic control valve of the working device, so that the mode of arranging the additional power take-off port on the control valve is relatively easy to realize.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides a loader parking filling liquid system which characterized in that: the hydraulic control system comprises a liquid filling electromagnetic valve, a first pressure switch, a second pressure switch, an energy accumulator, a parking oil cylinder, a parking electromagnetic valve, a one-way valve, a throttle valve and a hydraulic control valve of a working device;
the outlet of the liquid filling electromagnetic valve is connected with an energy accumulator, a first pressure switch is connected with the energy accumulator, the energy accumulator is connected with a parking oil cylinder through a parking electromagnetic valve, a second pressure switch is connected with the parking oil cylinder, the inlet of the liquid filling electromagnetic valve is connected with a throttle valve, and the outlet of a hydraulic control valve of a working device is connected with the inlet of the liquid filling electromagnetic valve through a one-way valve;
the controller is connected with the first pressure switch and the second pressure switch, receives pressure signals fed back by the first pressure switch and the second pressure switch, is connected with the liquid filling electromagnetic valve and the parking electromagnetic valve at the same time, and sends opening and closing instructions; the controller is also connected with a hydraulic pump of the working device and controls the hydraulic pump of the service braking system to switch the working state after receiving a signal fed back by the pressure switch.
2. A loader parking charging system as defined in claim 1, wherein: the hydraulic control valve of the working device is also connected with a hydraulic pump of the working device, and the pressure oil source is provided by the hydraulic pump of the working device.
3. A loader parking charging system as defined in claim 1, wherein: the pressure reducing valve is arranged on a pipeline between the outlet of the liquid filling solenoid valve and the accumulator.
4. The parking liquid filling system and method for the loader as claimed in claim 1, wherein: the pressure settings of the first pressure switch and the second pressure switch differ by no more than 5%.
5. A working method of a parking liquid filling system of a loader according to any one of claims 1 to 4, characterized by comprising the following steps:
when the first pressure switch detects that the pressure of the energy accumulator is insufficient, the controller controls the liquid filling electromagnetic valve to be opened, the hydraulic pump of the working device is changed from low pressure to high pressure, the high-pressure oil source is pumped into the energy accumulator through the one-way valve and the liquid filling electromagnetic valve, and when the set value of the first pressure switch is reached, the controller controls the liquid filling electromagnetic valve to be turned off after delaying for several seconds, and liquid filling is completed.
6. The working method of the parking liquid filling system of the loader as claimed in claim 5, wherein: when the controller controls the parking electromagnetic valve to be opened, pressure oil in the energy accumulator enters the parking oil cylinder, and the parking state is released.
7. The working method of the parking liquid filling system of the loader as claimed in claim 5, wherein: when the parking electromagnetic valve is closed, hydraulic oil of the parking oil cylinder returns to the oil tank and enters a parking state.
8. The working method of the parking liquid filling system of the loader as claimed in claim 5, wherein:
when the hydraulic oil is in a parking release state, if one of the first pressure switch and the second pressure switch detects that the parking pressure is lower than a set value, the hydraulic valve is controlled to be opened, the hydraulic pump of the working device is switched to a high-pressure standby state, and the pressure oil enters the energy accumulator through the pressure reducing valve to be charged;
when the pressure reaches the set value of the first pressure switch or the set value of the second pressure switch, the controller controls the liquid filling electromagnetic valve to be closed after delaying for several seconds, and liquid filling is finished.
9. The working method of the parking liquid filling system of the loader as claimed in claim 5, wherein: when the pressure of the hydraulic system of the working device is greater than the set pressure values of the first pressure switch and the second pressure switch, the pressure reducing valve enables the pressure oil passing through the liquid filling solenoid valve to flow back to the oil tank, and active liquid filling is not triggered.
10. The working method of the parking liquid filling system of the loader as claimed in claim 5, wherein: after the liquid filling is finished, the liquid filling electromagnetic valve is closed, and the throttle valve is opened to release the residual stress in the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124263.9A CN111267808A (en) | 2020-02-27 | 2020-02-27 | Parking liquid filling system and method for loader |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124263.9A CN111267808A (en) | 2020-02-27 | 2020-02-27 | Parking liquid filling system and method for loader |
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| CN111267808A true CN111267808A (en) | 2020-06-12 |
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| CN202010124263.9A Pending CN111267808A (en) | 2020-02-27 | 2020-02-27 | Parking liquid filling system and method for loader |
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Cited By (3)
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| CN112963524A (en) * | 2021-02-06 | 2021-06-15 | 哈尔滨东安汽车发动机制造有限公司 | Electronic gear shifting hydraulic control oil circuit of automatic transmission of automobile |
| CN114906111A (en) * | 2022-06-09 | 2022-08-16 | 广西柳工机械股份有限公司 | Parking brake control system, control method thereof and loader |
| CN117246293A (en) * | 2023-11-16 | 2023-12-19 | 杭叉集团股份有限公司 | Brake control system and hydraulic control system of electric forklift |
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Application publication date: 20200612 |