CN210033988U

CN210033988U - Fuel oil over-consumption prevention system for bulldozer

Info

Publication number: CN210033988U
Application number: CN201920893941.0U
Authority: CN
Inventors: 张乃健; 姜友山
Original assignee: Shantui Chutian Construction Machinery Co Ltd
Current assignee: Shantui Chutian Construction Machinery Co Ltd
Priority date: 2019-06-13
Filing date: 2019-06-13
Publication date: 2020-02-07
Anticipated expiration: 2029-06-13

Abstract

An oil outlet of the fuel tank is respectively connected to oil inlets of the scraper knife lifting reversing valve and the scraper knife tilting reversing valve through a working pump, and oil outlets of the scraper knife lifting reversing valve and the scraper knife tilting reversing valve are respectively connected with a scraper knife lifting oil cylinder and a scraper knife tilting oil cylinder; an outlet of the fuel tank is connected to an oil inlet of the scraper knife pilot valve through a fan pump, an oil outlet of the scraper knife pilot valve is respectively connected to a control end of the scraper knife lifting reversing valve and a control end of the scraper knife inclination reversing valve, and a safety valve is arranged between the scraper knife lifting reversing valve and the scraper knife pilot valve; the safety valve is connected with the liquid level sensor through a controller. The controller collects signals of the liquid level sensor, and the safety valve is controlled to cut off a pilot oil way at the descending position control end of the scraper knife lifting reversing valve, so that the scraper knife cannot descend, fuel oil is effectively prevented from being burnt, and the system is simple and reasonable in structure.

Description

Fuel oil over-consumption prevention system for bulldozer

Technical Field

The utility model belongs to the technical field of the bull-dozer safety, specifically speaking is a bull-dozer is with preventing fuel oil over-consumption system.

Background

The bulldozer is an earthwork engineering machine capable of excavating, transporting and discarding rock soil, and has wide application in open mines, the general bulldozer has severe operation condition and higher requirement on operation safety, a user often puts main energy on the engineering itself during operation and sometimes drives the engineering progress, and fuel amount prompt on an instrument panel of the bulldozer is less and often focuses on, so that fuel of a fuel tank is often burnt out, the fuel tank cannot normally return to an oil station for refueling, even parts of a power system can be damaged due to fuel burning out, economic loss is caused, and operation process and efficiency are greatly influenced.

SUMMERY OF THE UTILITY MODEL

When using the bull-dozer operation today, often can cause the fuel of fuel tank to be burnt dry, can't normally get back to the oil station and refuel, cause economic loss because the fuel burns dry can damage driving system spare part even to influence the problem of operation process and efficiency greatly, the utility model provides a bull-dozer is with preventing that the fuel is too worn the system.

The utility model discloses a realize through following technical scheme.

An oil outlet of the fuel tank is respectively connected to oil inlets of the scraper knife lifting reversing valve and the scraper knife inclination reversing valve through working pumps, and oil outlets of the scraper knife lifting reversing valve and the scraper knife inclination reversing valve are respectively connected with a scraper knife lifting oil cylinder and a scraper knife inclination oil cylinder; an outlet of the fuel tank is connected to an oil inlet of the scraper knife pilot valve through a fan pump, an oil outlet of the scraper knife pilot valve is respectively connected to a control end of the scraper knife lifting reversing valve and a control end of the scraper knife inclination reversing valve, and a safety valve is arranged between the scraper knife lifting reversing valve and the scraper knife pilot valve; the safety valve is connected with the liquid level sensor through the controller, and the controller collects liquid level signals of the liquid level sensor and controls the safety valve to act. The controller collects a liquid level signal of the liquid level sensor to judge whether enough oil exists in the fuel tank, when the fuel tank is less, the controller controls the safety valve to act to cut off a pilot oil way at a descending position control end of the scraper knife lifting reversing valve, so that the scraper knife cannot descend, but can rise, so as to remind the scraper knife to supplement fuel oil and prevent the fuel oil from being burnt.

The utility model discloses a further improvement still, foretell spiller pilot valve oil inlet has the agitator pilot valve in parallel, and the work pump oil-out is connected with agitator switching-over valve, and agitator switching-over valve oil-out is connected to the agitator hydro-cylinder, and agitator pilot valve oil-out is connected to agitator switching-over valve control end. Realize the function of loosening the soil of agitator.

The utility model discloses a further improvement still, foretell fan pump export has connected gradually relief pressure valve and fan motor, and the relief pressure valve oil-out is parallelly connected to have check valve II, and II exports of check valve are connected to spiller pilot valve and agitator pilot valve oil inlet respectively through the stop valve. The heat dissipation function of the hydraulic system of the bulldozer is realized through the fan motor, and the stable operation of the hydraulic system is ensured.

The utility model discloses a further improvement still, install the energy storage ware between foretell check valve II and stop valve. The pressure stability of the hydraulic system is ensured.

The utility model discloses a further improvement still, foretell spiller lift switching-over valve, spiller slope switching-over valve and agitator switching-over valve oil return opening all are connected to the fuel tank through the oil filter.

The utility model discloses a further improvement still, foretell relief pressure valve oil return opening, spiller pilot valve oil return opening and agitator pilot valve oil return opening all are connected with the oil return piece, and the fan motor oil return opening is connected to the oil return piece through parallelly connected check valve I and oil cooler. And the oil in the oil return pipeline returns to the fuel tank through the oil return block, so that the complete circulation of the oil circuit is realized.

The utility model discloses a further improvement still, install the valve that falls soon between foretell spiller lift switching-over valve and spiller lift cylinder.

The utility model has the advantages that: 1. the system is simple and reasonable, the manufacturing cost is low, the oil level is automatically detected, and manual observation is not needed; 2. the controller collects a liquid level signal of the liquid level sensor to judge whether enough oil exists in the fuel tank, when the fuel oil is lower than a certain liquid level, the controller controls the action of the safety valve to cut off a pilot oil way at a descending position control end of the lifting reversing valve of the scraper knife, so that the scraper knife cannot descend, but can ascend, remind to supplement the fuel oil, and effectively prevent the fuel oil from being burnt; 3. the normal operation of the power system parts is ensured, the production efficiency is improved, and the loss caused by the over consumption of fuel oil is avoided.

Drawings

Fig. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of a fuel tank according to an embodiment of the present invention.

In the drawings: 1. the hydraulic shovel comprises a working pump, 2, a shovel blade lifting reversing valve, 3, a shovel blade pilot valve, 4, a scarifier pilot valve, 5, a scarifier oil cylinder, 6, a shovel blade lifting oil cylinder, 7, a scarifier reversing valve, 8, a shovel blade tilting oil cylinder, 9, an oil filter, 10, a fuel tank, 11, a one-way valve I, 12, an energy accumulator, 13, a pressure reducing valve, 14, an oil cooler, 15, an oil return block, 16, a stop valve, 17, a fan pump, 18, a one-way valve II, 19, a fan motor, 20, a quick-lowering valve, 21, a safety valve, 22, a liquid level sensor, 23 and a shovel blade tilting reversing valve.

Detailed Description

The following describes the embodiments of the present invention with reference to the accompanying drawings.

As shown in the attached drawings, the fuel over-consumption prevention system for the bulldozer comprises a scraper knife lifting reversing valve 2, a scraper knife inclination reversing valve 23, a scarifier reversing valve 7, a scraper knife pilot valve 3, a scarifier pilot valve 4 and a fuel tank 10 internally provided with a liquid level sensor 22, wherein the fuel outlet of the fuel tank 10 is respectively connected to the oil inlets of the scraper knife lifting reversing valve 2, the scraper knife inclination reversing valve 23 and the scarifier reversing valve 7 through a working pump 1, and the oil outlets of the scraper knife lifting reversing valve 2, the scraper knife inclination reversing valve 23 and the scarifier reversing valve 7 are respectively connected with a scraper knife lifting oil cylinder 6, a scraper knife inclination oil cylinder 8 and a scarifier oil cylinder 5; an outlet of the fuel tank 10 is sequentially connected with a pressure reducing valve 13 and a fan motor 19 through a fan pump 17, an oil outlet of the pressure reducing valve 13 is connected with a one-way valve II 18 in parallel, an outlet of the one-way valve II 18 is connected to oil inlets of a shovel blade pilot valve 3 and a scarifier pilot valve 4 through a stop valve 16 respectively, the shovel blade pilot valve 3 comprises two electromagnetic valves (an electromagnetic valve I and an electromagnetic valve II), two oil outlets (K1 and K3) of the electromagnetic valve I are connected to a control end (K1 and K3) of a shovel blade inclined reversing valve 23 respectively, two oil outlets (K2 and K4) of the electromagnetic valve II are connected to a control end (K2 and K4) of a shovel blade lifting reversing valve 2 respectively, and two oil outlets (K5 and K6) of the scarifier pilot valve 4 are connected to a control end; a safety valve 21 is arranged between the K4 control end (scraper knife descending control) of the scraper knife lifting reversing valve 2 and the scraper knife pilot valve 3; the safety valve 21 is connected with the liquid level sensor 22 through a controller, and the controller collects liquid level signals of the liquid level sensor 22 and controls the safety valve 21 to act. An energy accumulator 12 is installed between the one-way valve II 18 and the stop valve 16, the scraper knife lifting reversing valve 2, the scraper knife inclination reversing valve 23 and the oil return opening of the scarifier reversing valve 7 are connected to a fuel tank 10 through an oil filter 9, the oil return opening of the pressure reducing valve 13, the oil return opening of the scraper knife pilot valve 3 and the oil return opening of the scarifier pilot valve 4 are connected with an oil return block 15, the oil return opening of the fan motor 19 is connected to the oil return block 15 through the one-way valve I11 and the oil cooler 14 which are connected in parallel, and a quick-dropping valve 20 is installed between the scraper knife lifting reversing valve 2 and the scraper.

According to the fuel over-consumption prevention system for the bulldozer, the safety valve 21 does not act when the bulldozer normally works, and the bulldozer can realize all actions of lifting of the scraper knife, inclining of the scraper knife and working of the scarifier. When the liquid level sensor 22 detects that the liquid level of the fuel in the fuel tank 10 is lower than a certain specific value set by the controller, the controller controls the safety valve 21 to be electrified, the oil circuit at the safety valve 21 is cut off, if a driver controls the operating handle to lift the scraper knife, namely K2 is switched on, pilot oil sequentially passes through the fan pump 17, the pressure reducing valve 13, the one-way valve II 18, the stop valve 16, the K2 outlet of the scraper knife pilot valve 3 and the K2 control end of the scraper knife lifting reversing valve 2, the valve core of the scraper knife lifting reversing valve 2 moves to the right, the oil circuit communicated with the rod cavity of the scraper knife lifting oil cylinder 6 is conducted, and the scraper knife can realize lifting operation; if the driver controls the operating handle to enable the scraper knife to descend, pilot oil sequentially passes through the fan pump 17, the pressure reducing valve 13, the one-way valve II 18, the stop valve 16, a K4 outlet of the scraper knife pilot valve 3 and the safety valve 21, an oil path is cut off at the safety valve 21, namely, no pilot oil pressure exists at a K4 control end of the scraper knife lifting reversing valve 2, so that a valve core of the scraper knife lifting reversing valve 2 is located at a middle position, an oil path leading to a rodless cavity of the scraper knife lifting oil cylinder 6 is blocked, the scraper knife cannot descend, workers are forcibly prompted, fuel oil is insufficient, and fuel oil is effectively prevented from being burnt. When the fuel level reaches a value lower than the allowable value, the engine can still work although the blade cannot work downwards, and the bulldozer can be driven to a fuel station for refueling.

In the same principle, a safety valve can be additionally arranged in front of the descending control end K6 of the ripper reversing valve 7, and the control is carried out through a controller, so that the descending action of the ripper is limited when fuel is low, and the purpose of preventing the fuel from being burnt dry is achieved.

The fuel over-consumption prevention system for the bulldozer is simple and reasonable, low in manufacturing cost, capable of automatically detecting the fuel level without manual observation, capable of effectively preventing the fuel from being burnt dry, capable of ensuring normal operation of power system parts, capable of improving production efficiency and capable of avoiding loss of part damage caused by fuel over-consumption.

Claims

1. A fuel oil over-consumption prevention system for a bulldozer is characterized by comprising a scraper knife lifting reversing valve (2), a scraper knife inclination reversing valve (23), a scraper knife pilot valve (3) and a fuel tank (10) internally provided with a liquid level sensor (22), wherein the fuel outlet of the fuel tank (10) is respectively connected to the oil inlets of the scraper knife lifting reversing valve (2) and the scraper knife inclination reversing valve (23) through a working pump (1), and the oil outlets of the scraper knife lifting reversing valve (2) and the scraper knife inclination reversing valve (23) are respectively connected with a scraper knife lifting oil cylinder (6) and a scraper knife inclination oil cylinder (8); an outlet of the fuel tank (10) is connected to an oil inlet of the scraper knife pilot valve (3) through a fan pump (17), an oil outlet of the scraper knife pilot valve (3) is respectively connected to control ends of the scraper knife lifting reversing valve (2) and the scraper knife inclination reversing valve (23), and a safety valve (21) is arranged between the scraper knife lifting reversing valve (2) and the scraper knife pilot valve (3); the safety valve (21) is connected with the liquid level sensor (22) through a controller, and the controller collects liquid level signals of the liquid level sensor (22) and controls the safety valve (21) to act.

2. The fuel oil over-consumption prevention system for the bulldozer according to claim 1, characterized in that a ripper pilot valve (4) is connected in parallel to an oil inlet of the shovel blade pilot valve (3), an oil outlet of the working pump (1) is connected with a ripper reversing valve (7), an oil outlet of the ripper reversing valve (7) is connected to a ripper oil cylinder (5), and an oil outlet of the ripper pilot valve (4) is connected to a control end of the ripper reversing valve (7).

3. The fuel-oil-over-consumption prevention system for the bulldozer as claimed in claim 2, wherein an outlet of the fan pump (17) is sequentially connected with a pressure reducing valve (13) and a fan motor (19), an oil outlet of the pressure reducing valve (13) is connected in parallel with a check valve II (18), and an outlet of the check valve II (18) is respectively connected to oil inlets of the shovel blade pilot valve (3) and the ripper pilot valve (4) through a stop valve (16).

4. The fuel over-consumption prevention system for the bulldozer according to claim 3, characterised in that an accumulator (12) is arranged between said check valve II (18) and said shut-off valve (16).

5. The fuel over-consumption prevention system for the bulldozer according to claim 2, characterized in that the return ports of the blade lifting reversing valve (2), the blade tilting reversing valve (23) and the ripper reversing valve (7) are connected to the fuel tank (10) through a fuel filter (9).

6. The fuel over-consumption prevention system for the bulldozer according to claim 3, wherein the return port of the pressure reducing valve (13), the return port of the scraper pilot valve (3) and the return port of the ripper pilot valve (4) are connected with a return block (15), and the return port of the fan motor (19) is connected to the return block (15) through a check valve I (11) and an oil cooler (14) which are connected in parallel.

7. The fuel over-consumption prevention system for the bulldozer according to claim 1, wherein a quick-drop valve (20) is mounted between the blade lift reversing valve (2) and the blade lift cylinder (6).