CN115874667A - Bulldozer blade resistance reduction control system and bulldozer - Google Patents
Bulldozer blade resistance reduction control system and bulldozer Download PDFInfo
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Abstract
The invention discloses a drag reduction control system of a bulldozer blade, which comprises a main oil supply unit, a working hydraulic switching unit, a pilot oil supply unit, a pilot hydraulic unit, a drag reduction hydraulic unit, an electric control unit and a hydraulic execution unit, wherein the main oil supply unit is connected with a hydraulic execution unit through a working hydraulic switching unit, the pilot hydraulic unit comprises a pilot valve group, the pilot oil supply unit is connected with the pilot valve group, a first port of the pilot valve group is connected with the working hydraulic switching unit, the drag reduction hydraulic unit comprises an electric control on-off valve connected with the pilot valve group in parallel, a second port of the pilot valve group and an outlet of the electric control on-off valve are connected with the working hydraulic switching unit through a shuttle valve, and the electric control unit comprises a control module electrically connected with the electric control on-off valve and a sensing element electrically connected with the control module. The invention also discloses a bulldozer. The drag reduction control system for the bulldozer blade can lift the blade, adjust the resistance of the blade during downward cutting and reduce the operation strength.
Description
Technical Field
The invention relates to a hydraulic control system, in particular to a drag reduction control system for a bulldozer blade. In addition, still relate to a bull-dozer.
Background
A bulldozer is one of the main types of earthmoving machines that can excavate, transport, and discard rock and soil, and has wide applications. For example, a bulldozer is generally used for various operations such as pushing, earth accumulation, ditching, earth filling, soil loosening, cleaning, earth breaking, traction, roadbed construction, material accumulation, surface stripping, leveling and compacting, snow clearing and deicing, garbage cleaning and the like, can meet the requirements of different operation conditions, is not only suitable for auxiliary work in engineering construction, but also suitable for various industries such as mining, water conservancy and hydropower industry, building or transportation industry, oil field port construction, agriculture and forestry, national defense, building materials, coal, metallurgy, environmental sanitation and the like.
The bulldozing device is the main equipment of bull-dozer, and it is direct and operating mode medium contact, and in the course of the work, the driver operates the promotion and the undercut of spiller through controlling the spiller handle to carry out operations such as levelling ground, transportation cubic metre of earth and stone.
However, when the bulldozer pushes the earth, the cutting depth of the blade is too large, and the resistance is too high, so that the crawler slips, the oil consumption is increased and the like. In the prior art, the spiller generally adopts hydraulic system to control, specifically, the driver controls the pilot valve through operating the pilot handle, and then controls the multiple unit valve, thereby the flexible of control cylinder, with this mesh that can reach promotion spiller, the bulldozer driver need control the pilot handle in succession in order to overcome the problem that the spiller skidded, constantly promote or cut the spiller down, carry out reasonable soil cutting through adjusting the spiller, this kind of mode is high to driver's working strength, and this kind of mode is higher to driver's technical merit's requirement.
In view of the above, there is a need to provide a blade drag reduction control system to solve or overcome the above technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a bulldozer blade resistance reduction control system, which can lift a blade, adjust the resistance of the blade during downward cutting and reduce the operation strength.
In order to solve the technical problems, the invention provides a blade drag reduction control system of a bulldozer, which comprises a main oil supply unit, a working hydraulic switching unit, a pilot oil supply unit, a pilot hydraulic unit, a drag reduction hydraulic unit, an electric control unit and a hydraulic execution unit, wherein the main oil supply unit is connected with a hydraulic execution unit through the working hydraulic switching unit and is used for driving the hydraulic execution unit, the pilot hydraulic unit comprises a pilot valve group, the pilot oil supply unit is connected with the pilot valve group through an oil duct, a first port of the pilot valve group is connected with a hydraulic control cavity on one side of the working hydraulic switching unit through a hydraulic control oil duct, the drag reduction hydraulic unit comprises an electric control on-off valve connected with the pilot valve group in parallel, a second port of the pilot valve group and an outlet of the electric control on-off valve are connected with a hydraulic control cavity on the other side of the working hydraulic switching unit through a shuttle valve so as to control the reversing of the working hydraulic switching unit, the electric control unit comprises a control module electrically connected with the electric control on-off valve and a sensing element used for collecting the power value of the bulldozer, and is controlled based on the on-off information collected by the sensing element.
Preferably, the electrically controlled on-off valve is a two-position three-way valve.
Preferably, the sensing element is a rotational speed sensor.
Preferably, the pilot oil supply unit includes a pilot pump fluidly connected to the oil tank.
Preferably, the main oil supply unit includes a working pump fluidly connected to the oil tank.
Furthermore, the working hydraulic switching unit comprises a hydraulic control reversing valve, the hydraulic execution unit is a hydraulic cylinder, a first oil port of the hydraulic control reversing valve is connected with the working pump through a first one-way valve, a second oil port of the hydraulic control reversing valve is connected with an oil tank, a third oil port of the hydraulic control reversing valve is connected with a rod cavity of the hydraulic cylinder, and a fourth oil port of the hydraulic control reversing valve is connected with a rodless cavity of the hydraulic cylinder.
Preferably, the first oil port of the hydraulic control reversing valve is also connected with an overflow safety valve.
Further, the rodless chamber of the hydraulic cylinder is connected with the oil tank via a second check valve to enable oil replenishment during operation.
Optionally, a pilot overflow valve group is further disposed on the pilot oil supply path between the pilot oil supply unit and the pilot hydraulic unit.
Another aspect of the present invention provides a bulldozer, comprising a drag reduction control system for a bulldozer blade described in any one of the above aspects.
Compared with the prior art, the invention has at least the following beneficial effects:
in a preferred embodiment of the present invention, the drag reduction control system for a bulldozer blade comprises an oil supply unit, a working hydraulic switching unit, a pilot oil supply unit, a pilot hydraulic unit, a drag reduction hydraulic unit, an electronic control unit and a hydraulic execution unit, wherein a main oil supply unit is connected with a hydraulic circuit of the hydraulic execution unit through the working hydraulic switching unit, the pilot hydraulic unit comprises a pilot valve group, the pilot oil supply unit is connected with the pilot valve group, a first port of the pilot valve group is connected with the working hydraulic switching unit, the drag reduction hydraulic unit comprises a pilot-controlled on-off valve connected in parallel with the pilot valve group, a second port of the pilot valve group and an outlet of the electronic-controlled on-off valve are connected with the working hydraulic switching unit through a shuttle valve, the electronic control unit comprises a control module electrically connected with the electronic-controlled on-off valve and a sensing element electrically connected with the control module, so that the sensing element can transmit a collected signal to the control module, the control module compares the received signal with a preset value to judge whether the blade is stalled, thereby controlling the stall of the on-off valve, when the electronic-controlled on valve is electrically connected with the control module, the control element can transmit a collected signal to the hydraulic switching to the hydraulic switching unit, thereby reducing the hydraulic pressure of the hydraulic switching unit, and increasing the hydraulic switching of the hydraulic switching unit.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a hydraulic schematic of a prior art dozer blade lift control system;
FIG. 2 is a hydraulic schematic of one embodiment of the dozer blade drag reduction control system of the present invention;
FIG. 3 is a block diagram of the workflow of one embodiment of the dozer blade drag reduction control system of the present invention.
Description of the reference numerals
1 main oil supply unit 2 working hydraulic switching unit
201 pilot operated directional control valve 202 first check valve
203 overflow relief valve 204 second one-way valve
3 pilot oil supply unit 4 pilot hydraulic unit
401 pilot valve group 5 drag reduction hydraulic unit
501 electric control on-off valve 502 shuttle valve
6 electric control unit 601 control module
602 sensing element 7 hydraulic actuating unit
8 guide overflow valve group
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined as "first", "second", "third", "fourth" may explicitly or implicitly include one or more of the features described.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
First, it should be noted that, after knowing the technical idea of the hydraulic connection relationship of the present invention, it is also possible for those skilled in the art to simply replace the oil passage or the valve, etc. to achieve the function of the drag reduction control system of the bulldozer blade of the present invention, and this also falls within the protection scope of the present invention. The associated hydraulic components, such as directional valves, hydraulic cylinders, hydraulic pumps, etc., are well known to those skilled in the art and are common components in existing hydraulic systems, and therefore, these hydraulic components will be described only briefly hereinafter, with the description focusing on the inventive hydraulic connections of the present dozer blade drag reduction control system.
Referring to fig. 2, the invention provides a blade drag reduction control system for a bulldozer, which comprises a main oil supply unit 1, a working hydraulic switching unit 2, a pilot oil supply unit 3, a pilot hydraulic unit 4, a drag reduction hydraulic unit 5, an electronic control unit 6 and a hydraulic execution unit 7, wherein the main oil supply unit 1 is connected with a hydraulic execution unit 7 through a working hydraulic switching unit 2 in a hydraulic way so as to be capable of driving the hydraulic execution unit 7, the pilot hydraulic unit 4 comprises a pilot valve group 401, the pilot oil supply unit 3 is connected with the pilot valve group 401 through an oil duct, a first port of the pilot valve group 401 is connected with a hydraulic control cavity on one side of the working hydraulic switching unit 2 through a hydraulic control oil duct, the drag reduction hydraulic unit 5 comprises an electronic control on-off valve 501 connected with the pilot valve group 401 in parallel, a second port of the pilot valve group 401 and an outlet of the electronic control on-off valve 501 are connected with a hydraulic control cavity on the other side of the working hydraulic switching unit 2 through a shuttle valve 502 so as to be capable of controlling the reversing of the working hydraulic switching unit 2, the electronic control unit 6 comprises a control module 601 electrically connected with the on-off valve 601 and an on-off sensing element 602 electrically connected with the control module 601 for collecting power value of the bulldozer, and the electronic control on-off valve 602 based on the electronic control information.
The basic embodiment of the invention solves the problem that the bulldozer stalls and slips due to overhigh resistance caused by overlarge undercut depth of the scraper knife in the soil pushing process, and avoids the problems of caterpillar band slippage, oil consumption increase and the like. When the bulldozer stalls and slips, the drag reduction control system for the bulldozer blade can lift the blade and continuously adjust the resistance of the blade during undercutting, so that the normal operation of the bulldozer is ensured.
In the lifting control system of the bulldozer blade in the prior art, referring to a hydraulic schematic diagram of the lifting control system of the bulldozer blade in the prior art in fig. 1, the bulldozer blade can only be adjusted by a driver in a manual operation mode, the driver needs to continuously control a handle and continuously adjust the lifting or undercutting of the blade, so that the blade is controlled to reasonably cut soil, and higher requirements are provided for the operation technical level of the driver. In fig. 1, it can be clearly seen that the lifting or downward cutting of the blade is directly driven by the hydraulic cylinder, when the piston rod of the hydraulic cylinder is pushed up, the blade is lifted therewith, conversely, when the piston rod of the hydraulic cylinder is lowered, the blade is pushed down therewith, the pushing up and the lowering of the hydraulic cylinder are controlled by the reversing valve connected to the hydraulic cylinder and the pilot valve group 401 connected to the reversing valve, it should be noted that the pilot valve group 401 includes two manual pilot valves, which are connected to the reversing valve through a control oil path, the pilot valve group 401 can be operated by a handle, the hydraulic oil pumped by the oil pump can be sent to the reversing valve through the control oil path by operating the handle, so as to control the reversing valve to reverse, and the hydraulic oil is reversed by the reversing valve to control the extension and retraction of the blade cylinder, so that the blade can be adjusted.
According to the basic embodiment of the invention, the drag reduction control system of the bulldozer blade mainly comprises a main oil supply unit 1, a working hydraulic switching unit 2, a pilot oil supply unit 3, a pilot hydraulic unit 4, a drag reduction hydraulic unit 5, an electric control unit 6 and a hydraulic execution unit 7, and the biggest difference between the drag reduction control system and the bulldozer blade is that the electric control unit 6 and the drag reduction hydraulic unit 5 are added on the basis of the prior art, and the drag reduction function can be automatically started when the bulldozer operates and stalls and slips by combining the electric control unit 6 and the drag reduction hydraulic unit 5. It should be noted that the above-mentioned resistance reduction function refers to a function of lifting the blade of the bulldozer, so as to adjust the blade to cut soil reasonably and further reduce the resistance of the blade. The drag reduction hydraulic unit 5 comprises an electric control on-off valve 501 and a shuttle valve 502, the electric control unit 6 comprises a control module 601 electrically connected with the electric control on-off valve 501 and a sensing element 602 electrically connected with the control module 601, the sensing element 602 can collect a horsepower value of the bulldozer, the sensing element 602 can transmit the collected data to the control module 601, the control module 601 can preset a parameter threshold value, and the parameter threshold value is used for being compared with the collected data value, so that whether the bulldozer slips, stalls and other abnormal conditions occur or not can be judged. If the control module 601 judges that the bulldozer stalls, the control module can output voltage to the electronic control on-off valve 501, the electronic control on-off valve 501 is switched from off to on, hydraulic oil can generate pilot pressure to a hydraulic control cavity on one side of the working hydraulic pressure switching unit 2 through the electronic control on-off valve 501 and the shuttle valve 502 in sequence, so that the reversing of the working hydraulic pressure switching unit 2 is controlled, the working hydraulic pressure switching unit 2 is in hydraulic connection with the hydraulic execution unit 7, and the bulldozer scraper can be driven through controlling the hydraulic execution unit 7.
It should be noted that, in the basic embodiment of the present invention, the oil supply unit connected to the oil tank mainly includes the main oil supply unit 1 and the pilot oil supply unit 3, the main oil supply unit 1 and the pilot oil supply unit 3 have different functions, the hydraulic oil supplied from the main oil supply unit 1 flows into the hydraulic execution unit 7 through the working hydraulic switching unit 2 to drive the hydraulic execution unit 7, and the hydraulic oil supplied from the pilot oil supply unit 3 can flow into the hydraulic control cavity of the working hydraulic switching unit 2 through the hydraulic control oil passage to generate the pilot pressure for the working hydraulic switching unit 2, and the pilot pressure drives the valve core inside the valve body of the working hydraulic unit to change direction, so as to realize the switching of the oil passages.
As is apparent from the above description, the working hydraulic pressure switching unit 2 is used to drive the hydraulic actuator unit 7, which is the main control hydraulic unit of the drag reduction control system for a bulldozer blade of the present invention, and the pilot pressure is the key for controlling this working hydraulic pressure switching unit 2. The invention not only comprises a pilot hydraulic unit 4 which can generate pilot force to the working hydraulic switching unit 2, but also skillfully adds a drag reduction hydraulic unit 5, the pilot hydraulic unit 4 comprises a pilot valve group 401, a first port of the pilot valve group 401 is connected with a hydraulic control cavity at one side of the working hydraulic switching unit 2 through a hydraulic control oil passage, the downward cutting of a scraper knife is controlled through a hydraulic execution unit 7, and the electrically controlled on-off valve 501 of the drag reduction hydraulic unit 5 and the second port including the pilot valve group 401 are both connected to the hydraulic control chamber on the other side of the working hydraulic switching unit 2 through the pilot oil passage via the shuttle valve 502, the elevation of the blade is controlled by the hydraulic actuator unit 7, it being noted that, for the shuttle valve 502, the first oil inlet and the second oil inlet are respectively connected with an electric control on-off valve 501 and a pilot valve group 401, when the electrically controlled on-off valve 501 is on, it can compare the pressure of the hydraulic oil flowing in via the electrically controlled on-off valve 501 with the pressure of the hydraulic oil flowing in via the pilot valve group 401, and the hydraulic oil path on the side with higher pressure is connected, so that the hydraulic oil on the side with higher pressure flows into the hydraulic control chamber on the other side of the working hydraulic pressure switching unit 2 through the oil outlet of the hydraulic oil, and pilot pressure is generated to control the working hydraulic pressure switching unit 2 to switch the oil path, in the basic technical solution of the present invention, when the electrically controlled on-off valve 501 is on, the pressure of the hydraulic oil on the side where the shuttle valve 502 is connected to the electrically controlled on-off valve 501 is higher than the pressure on the side where the shuttle valve 502 is connected to the pilot valve group 401, and therefore, when the oil path on the high-pressure side is connected, the hydraulic oil generates pilot pressure to the hydraulic control chamber on the other side of the working hydraulic switching unit 2 through the shuttle valve 502, and controls the working hydraulic switching unit 2 to switch the oil path, so that the shovel blade is lifted through the hydraulic execution unit 7.
As a preferred embodiment of the present invention, the electrically controlled on-off valve 501 may be a two-position three-way solenoid valve. When the electromagnet of the electrically controlled on-off valve 501 is energized, the electrically controlled on-off valve 501 is in an on state, and since the electrically controlled on-off valve 501 is connected in parallel with the pilot valve group 401 of the pilot hydraulic unit 4, the hydraulic oil supplied from the pilot oil supply unit 3 flows out through the electrically controlled on-off valve 501 and enters the shuttle valve 502. Other suitable types of solenoid valves may be used for the electrically controlled on-off valve 501, and it is common in the art to use such solenoid valves with on-off function, and there are various choices of such valves on the market, which are not illustrated herein, however, the function of the solenoid valve selected herein is not limited thereto, and it also falls within the protection scope of the present invention as long as other types of solenoid valves are used for on-off purpose.
As another preferred embodiment of the invention, when the bulldozer stalls and skids, the rotating speed of the turbine of the torque converter or the rotating speed of the engine of the bulldozer changes, the invention can adopt a rotating speed sensor to acquire the rotating speed of the turbine of the torque converter or the rotating speed parameters of the engine in real time, or the invention can also combine the rotating speed sensor with an elevation sensor, when the rotating speed sensor acquires the rotating speed of the turbine of the torque converter or the rotating speed parameters of the engine, the parameter information is transmitted to the control module 601, the control module 601 compares the acquired parameter information with a preset parameter threshold value, thereby judging whether the bulldozer is in a stalled state, reading the elevation information of the blade of the bulldozer through the elevation sensor, when the bulldozer stalls, the control module 601 outputs voltage to the electric control on-off valve 501 such as a two-position three-way electromagnetic valve, and controls the blade to be lifted by a section of height. It should be noted that, when the bulldozer stalls, the control module 601 sends a stall command to the electrically controlled on-off valve 501 all the time, that is, the electrically controlled on-off valve 501 is always in the on state, the blade is lifted by a certain height until the electrically controlled on-off valve 501 stops receiving the stall command from the control module 601, and the blade finishes the lifting process. It should be noted that if the bulldozer is stalled and skidded after the blade is lifted for a certain height, the electronically controlled on-off valve 501 in the present invention may be opened repeatedly, and if the bulldozer can travel normally, the operation continues normally, and the control module 601 controls the electronically controlled on-off valve 501 to close.
Preferably, the pilot oil supply unit 3 comprises a pilot pump, which is connected to the oil tank and is able to deliver hydraulic oil to the pilot hydraulic unit 4, conceivably a hydraulic pump.
Preferably, the main oil supply unit 1 includes a working pump, the working pump is connected to an oil tank and is used for conveying hydraulic oil to the working hydraulic pressure switching unit 2, and the working pump is a hydraulic pump.
Further, the working hydraulic switching unit 2 includes a hydraulic control directional control valve 201, the hydraulic control directional control valve 201 is a main control valve of the working hydraulic switching unit 2, and can realize switching of a hydraulic oil path, the working hydraulic switching unit 2 is connected with the hydraulic execution unit 7, and the hydraulic execution unit 7 can be a hydraulic cylinder. As can be seen from fig. 2, two hydraulic cylinders are combined together to lift the blade, when the piston rod moves upwards, the blade is correspondingly lifted, and when the piston rod moves downwards, the blade is correspondingly cut downwards, although the number and the connection mode of the hydraulic cylinders are not limited thereto, and 1 or more hydraulic cylinders may be adopted, all of which fall within the protection scope of the present invention.
The hydraulic control reversing valve 201 of the invention has the following specific connection mode: a first oil port is connected with the working pump through a first check valve 202, a second oil port is connected with the oil tank, a third oil port is connected with a rod cavity of the hydraulic cylinder, and a fourth oil port is connected with a rodless cavity of the hydraulic cylinder. Because the first port of the pilot valve group 401 is connected with the hydraulic control cavity on one side of the working hydraulic switching unit 2 through the hydraulic control oil passage, the second port of the pilot valve group 401 and the outlet of the electric control on-off valve 501 are connected with the hydraulic control cavity on the other side of the working hydraulic switching unit 2 through the shuttle valve 502, when the pilot valve handle to which the first port of the pilot valve group 401 belongs is driven, the hydraulic control cavity connected with the first port of the pilot valve group 401 can be connected, the hydraulic control reversing valve 201 drives the piston rod of the hydraulic cylinder to descend, so that the scraper is manually driven to descend, when the pilot valve handle to which the second port belongs on the pilot valve group 401 is driven, the hydraulic control cavity connected with the second port of the pilot valve group 401 can be connected, the hydraulic control reversing valve 201 drives the piston rod of the hydraulic cylinder to ascend, so that the scraper is manually driven to ascend, and if the electric control on-off valve 501 is connected, the hydraulic control reversing valve 201 drives the piston rod of the hydraulic cylinder to ascend, and the scraper is automatically lifted for a certain distance.
Preferably, the first port of the pilot-controlled directional control valve 201 is further connected with an overflow relief valve 203 for balancing the pressure of the hydraulic oil path of the working hydraulic pressure switching unit 2.
Further, the rodless chamber of pneumatic cylinder is connected with the oil tank via second check valve 204, sets up second check valve 204 and can mend oil in the course of the work, specifically, when the piston rod of pneumatic cylinder descends because of the action of gravity fast and produces the vacuum in the pneumatic cylinder intracavity, thereby can follow the effect of inhaling the oil and playing the oil of mending fast in the oil tank.
Optionally, a pilot overflow valve group 8 is further disposed on the pilot oil supply path between the pilot oil supply unit 3 and the pilot hydraulic unit 4, for balancing pressure on the hydraulic oil path of the pilot hydraulic unit 4.
In addition, the invention also provides a bulldozer, which comprises the blade drag reduction control system of the bulldozer in any technical scheme. In the case where the present invention is applied to any one of the basic embodiments or the preferred embodiments described above, the bulldozer also has the advantages described above.
Referring to fig. 3, a flow chart of a work flow in an embodiment of the bulldozer blade drag reduction control system of the present invention will be described to facilitate understanding of the technical aspects of the present invention.
Firstly, a sensing element 602 acquires the rotating speed of a torque converter or an engine of a bulldozer;
secondly, the control module 601 receives data collected by the sensing element 602;
then, the control module 601 compares the acquired data with a preset value to judge whether the torque converter or the engine is abnormal;
finally, if the control module 601 finds that the bulldozer stalls, voltage is output to the electronic control on-off valve 501, so that the electronic control on-off valve 501 is switched on to lift the shovel blade; if the bulldozer is working normally, the electronically controlled on-off valve 501 is not turned on.
In summary, as a preferred embodiment of the present invention, the drag reduction control system for bulldozer blade of the present invention comprises a main oil supply unit 1, a working hydraulic pressure switching unit 2, a pilot oil supply unit 3, a pilot hydraulic pressure unit 4, a drag reduction hydraulic pressure unit 5, an electric control unit 6 and a hydraulic execution unit 7, wherein the main oil supply unit 1 comprises a working pump with a liquid path connected to an oil tank, the pilot oil supply unit 3 comprises a pilot pump with a liquid path connected to the oil tank, the working hydraulic pressure switching unit 2 comprises a hydraulic control directional control valve 201, the hydraulic execution unit 7 is a hydraulic cylinder, the pilot hydraulic pressure unit 4 comprises a pilot valve group 401, the drag reduction hydraulic unit 5 comprises an electric control on-off valve 501 connected in parallel with the pilot valve group 401, the electric control unit 6 comprises a control module 601 electrically connected to the electric control on-off valve 501 and a sensing element 602 electrically connected to the control module 601 and used for collecting power value of bulldozer, the working pump is connected with the hydraulic cylinder through the hydraulic control reversing valve 201, specifically, a first oil port of the hydraulic control reversing valve 201 is connected with the working pump through the first check valve 202, a second oil port of the hydraulic control reversing valve 201 is connected with an oil tank, a third oil port of the hydraulic control reversing valve 201 is connected with a rod cavity of the hydraulic cylinder, a fourth oil port of the hydraulic control reversing valve 201 is connected with a rodless cavity of the hydraulic cylinder, the pilot pump is connected with the pilot valve group 401 through an oil duct, a first port of the pilot valve group 401 is connected with a hydraulic control cavity on one side of the hydraulic control reversing valve 201 through a hydraulic control oil duct, and a second port of the pilot valve group 401 and an outlet of the electric control on-off valve 501 are connected with a hydraulic control cavity on the other side of the hydraulic control reversing valve 201 through the shuttle valve 502. According to the invention, the control module 601 is electrically connected with the electric control on-off valve 501, and the sensing element 602 is electrically connected with the control module 601, so that the sensing element 602 can transmit the acquired signal to the control module 601, the control module 601 compares the received signal with a preset value to judge whether the scraper blade stalls, thereby controlling the on-off of the electric control on-off valve 501, when the electric control on-off valve 501 is switched on, hydraulic oil can be conveyed to a hydraulic control cavity of the hydraulic control reversing valve 201 through a hydraulic control oil duct, so that a hydraulic cylinder is driven by switching the oil duct to lift the scraper blade, thereby adjusting the resistance when the scraper blade is switched off, and reducing the operation intensity of a driver.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. The drag reduction control system for the bulldozer blade is characterized by comprising a main oil supply unit (1), a working hydraulic switching unit (2), a pilot oil supply unit (3), a pilot hydraulic unit (4), a drag reduction hydraulic unit (5), an electric control unit (6) and a hydraulic execution unit (7), wherein the main oil supply unit (1) is connected with the hydraulic execution unit (7) through a working hydraulic switching unit (2) in a liquid path manner so as to drive the hydraulic execution unit (7), the pilot hydraulic unit (4) comprises a pilot valve group (401), the pilot oil supply unit (3) is connected with the pilot valve group (401) through an oil duct, a first port of the pilot valve group (401) is connected with a liquid control cavity on one side of the working hydraulic switching unit (2) through a hydraulic control oil duct, the drag reduction hydraulic unit (5) comprises an electric control on-off valve (501) connected with the pilot valve group (401) in parallel, a second port of the pilot valve group (401) and an outlet of the electric control on-off valve (501) are electrically connected with the working hydraulic switching unit (2) through a shuttle valve (502), and the electric control acquisition module (601) is electrically connected with the electric control switching unit (601) and the electric control module (601) and the electric control unit (6) is used for acquiring power value acquisition and the electric control module (601) of the electric control module (601) ) The on-off of the electric control on-off valve (501) can be controlled based on the collected information of the sensing element (602).
2. The bulldozer blade drag reduction control system of claim 1, wherein said electronically controlled on-off valve (501) is a two-position, three-way valve.
3. The dozer blade drag reduction control system of claim 1, wherein said sensing element (602) is a rotational speed sensor.
4. The bulldozer blade drag reduction control system according to claim 1, characterised in that the pilot oil supply unit (3) comprises a pilot pump which is hydraulically connected to an oil tank.
5. The bulldozer blade drag reduction control system according to claim 1, characterised in that the main oil supply unit (1) comprises a working pump hydraulically connected to an oil tank.
6. The bulldozer blade drag reduction control system according to claim 5, wherein the working hydraulic pressure switching unit (2) comprises a hydraulic control directional control valve (201), the hydraulic execution unit (7) is a hydraulic cylinder, a first oil port of the hydraulic control directional control valve (201) is connected with the working pump via a first check valve (202), a second oil port of the hydraulic control directional control valve (201) is connected with an oil tank, a third oil port of the hydraulic control directional control valve (201) is connected with a rod cavity of the hydraulic cylinder, and a fourth oil port of the hydraulic control directional control valve (201) is connected with a rodless cavity of the hydraulic cylinder.
7. The bulldozer blade drag reduction control system of claim 6, wherein an overflow relief valve (203) is also connected to the first port of the pilot operated directional control valve (201).
8. The dozer blade drag reduction control system as claimed in claim 7 wherein the rodless chamber of the hydraulic cylinder is connected to a tank via a second check valve (204) to enable oil replenishment during operation.
9. The resistance-reducing control system for a bulldozer blade according to claim 1, characterized in that a pilot spill valve block (8) is further provided on the pilot oil supply circuit between the pilot oil supply unit and the pilot hydraulic unit (4).
10. A bulldozer, comprising a bulldozer blade drag reduction control system defined in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211643566.7A CN115874667A (en) | 2022-12-20 | 2022-12-20 | Bulldozer blade resistance reduction control system and bulldozer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211643566.7A CN115874667A (en) | 2022-12-20 | 2022-12-20 | Bulldozer blade resistance reduction control system and bulldozer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115874667A true CN115874667A (en) | 2023-03-31 |
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ID=85754096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211643566.7A Pending CN115874667A (en) | 2022-12-20 | 2022-12-20 | Bulldozer blade resistance reduction control system and bulldozer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115874667A (en) |
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2022
- 2022-12-20 CN CN202211643566.7A patent/CN115874667A/en active Pending
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