CN114508514A - Land leveler multi-rotary-motor control hydraulic system and control method thereof - Google Patents

Abstract

The invention discloses a hydraulic system for controlling multiple rotary motors of a grader and a control method thereof, belonging to the field of electro-hydraulic control of construction machinery. The system includes a hydraulic oil tank, a reversing valve, a diverter valve, a plurality of turbine boxes, a plurality of rotary motors, a plurality of two-way overload valves, a plunger pump, an oil suction filter, etc. A swing motor control loop. The invention can realize the movement of multiple rotary motors at the same rotational speed and the same pressure, thereby ensuring that the multiple turbine boxes move at the same rotational speed, with uniform force and smooth movement.

Description

A hydraulic system for controlling multiple slewing motors of a motor grader and its control method

technical field

The invention relates to a hydraulic system for controlling multiple rotary motors of a motor grader and a control method thereof, belonging to the field of electro-hydraulic control of construction machinery.

Background technique

With the rapid development of my country's economic construction, the demand for energy, electricity and non-ferrous metals is increasing, which directly leads to the prosperity of coal, iron and non-ferrous metal mining industries. Open pit mines account for a considerable proportion. High horsepower and convenient transportation have attracted attention from all parties. In open-pit mining, the convenience of transportation requires high-horsepower graders to clean and level the road surface. In this case, high-horsepower graders appear as important auxiliary equipment for mining.

High-horsepower motor graders, especially motor graders above 500 horsepower, have wide and long blades and strong load capacity. The diameter of the matching rotary gear ring is usually about 2.5m. If there is only one turbine box + rotary motor to drive the rotary gear Not only the force of the rotary ring gear is uneven and easy to shake, but also the turbine box and the rotary motor are large in size, difficult to arrange, and the failure rate is extremely high, which affects the construction efficiency and construction accuracy.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a hydraulic system for controlling multiple slewing motors of a motor grader. It moves at the same speed and pressure, so as to ensure that multiple turbine boxes move at the same speed, with uniform force and smooth movement.

To achieve the above object, the present invention adopts the following technical solutions:

A hydraulic system for controlling multiple swing motors of a motor grader, comprising a hydraulic oil tank, a reversing valve, a diverter valve, a plunger pump, an oil suction filter, multiple turbine boxes, multiple swing motors and multiple two-way overload valves;

The hydraulic oil tank is respectively connected with the reversing valve and the oil suction filter, the oil suction filter is connected with the oil suction port of the plunger pump, the oil outlet of the plunger pump is connected with the reversing valve, and the reversing valve is connected with the oil inlet of the diverter valve The oil outlet of the diverter valve is connected to a plurality of two-way overload valves respectively, and the plurality of two-way overload valves are confluent and connected to the reversing valve, each two-way overload valve is connected to a rotary motor, and each rotary motor is engaged with a turbine box. .

further,

The reversing valve is a three-position four-way valve, the oil inlet of the three-position four-way valve is connected with the oil outlet of the plunger pump, and the oil return port of the three-position four-way valve is connected with the hydraulic oil tank. , One working oil port of the three-position four-way valve is connected with the oil inlet of the diverter valve, and the other working oil port is connected with the oil circuit after the confluence of the multiple two-way overload valves.

further,

The diverter valve is provided with a plurality of outflow ports, and each outflow port is correspondingly connected to a two-way overload valve.

further,

The number of the turbine box, the rotary motor and the two-way overload valve is two, including the turbine box I, the turbine box II, the rotary motor I, the rotary motor II, the two-way overload valve I and the two-way overload valve II. There are two oil outlets, one oil outlet is connected to the oil inlet of the two-way overload valve I, the other oil outlet is connected to the oil inlet of the two-way overload valve II, and the oil outlet of the two-way overload valve I is connected to the rotary motor. I. The oil outlet of the two-way overload valve II is connected to the rotary motor II, and the oil circuit after the confluence of the two-way overload valve I and the two-way overload valve II is connected to the working oil port of the reversing valve.

Correspondingly, a control method for controlling a hydraulic system of a plurality of slewing motors of a motor grader,

The method includes:

Control the plunger pump to pump the hydraulic oil in the hydraulic oil tank, convert the hydraulic oil into high-pressure oil, and then pump it to the reversing valve;

controlling the reversing valve to be energized to pump high pressure oil to the diverter valve;

Use the diverter valve to divert the flow of oil through the two-way overload valve to the same oil flow and oil pressure, so that the oil flow and differential pressure of each rotary motor are consistent, and the torque output by each turbine box is consistent;

The oil after the control work is returned to the hydraulic oil tank through the oil circuit and the reversing valve after the confluence of multiple two-way overload valves.

Correspondingly, a control method for controlling a hydraulic system of a plurality of slewing motors of a motor grader,

Control the plunger pump to pump the hydraulic oil in the hydraulic oil tank, convert the hydraulic oil into high-pressure oil, and then pump it to the reversing valve;

The reversing valve is controlled to be energized, so as to pump the high-pressure oil to the oil circuit where the plurality of bidirectional overload valves are confluent.

Correspondingly, a control method for controlling a hydraulic system of a plurality of slewing motors of a motor grader,

The diverter valve is used to divert the flow of oil through the two-way overload valves to the same oil flow and oil pressure, so that the oil flow and differential pressure of each rotary motor are consistent, and the torque output by each turbine box is consistent.

Correspondingly, a control method for controlling a hydraulic system of a plurality of slewing motors of a motor grader,

The oil after control work is returned to the hydraulic oil tank through the diverter valve and the reversing valve.

Correspondingly, a control method for controlling a hydraulic system of a plurality of slewing motors of a motor grader,

When the turbine box is overloaded and slipped, the reversing valve is controlled not to be energized, so that the hydraulic oil only flows between the two-way overload valve and the swing motor.

Beneficial effects, a hydraulic system for controlling multiple rotary motors of a motor grader and a control method thereof of the present invention, the flow and pressure input by each motor are the same, and the torque output by each turbine box connected with it is consistent, when they jointly drive the rotary gears. When turning, the force points of the rotating ring gear are uniform, the rotation is smooth, and there are no failures such as jamming and jittering, which improves the operation efficiency and operation accuracy of the grader.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. For the convenience of understanding, the accompanying drawings and specific embodiments take two rotary motors as examples:

Fig. 1 is the hydraulic principle diagram of the present invention;

In the figure: 1. Hydraulic oil tank, 2. Reversing valve, 3. Diverter valve, 4-I, turbine box I, 4-II, turbine box II, 5-I, rotary motor I, 5-II, rotary motor II , 6-I, two-way overload valve I, 6-II, two-way overload valve II, 7, plunger pump, 8, suction filter.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figure 1, a hydraulic system for controlling multiple rotary motors of a motor grader includes a hydraulic oil tank 1, a reversing valve 2, a diverter valve 3, a plunger pump 7, an oil suction filter 8, a plurality of turbine boxes 4, a plurality of A rotary motor 5 and a plurality of two-way overload valves 6; the hydraulic oil tank 1 is respectively connected to the reversing valve 2 and the oil suction filter 8, the oil suction filter 8 is connected to the oil suction port of the plunger pump 7, and the oil outlet of the plunger pump 7 The port is connected to the reversing valve 2, the reversing valve 2 is connected to the oil inlet of the diverter valve 3, the oil outlet of the diverter valve 3 is respectively connected to a plurality of two-way overload valves 6, and the plurality of two-way overload valves 6 merge with the diverter valve. To the valve 2, each two-way overload valve 6 is connected to a swing motor 5, and each swing motor 5 is connected to a turbine box 4 by spline engagement. The reversing valve 2 is provided with No. 1 port, No. 2 port, No. 3 port and No. 4 port, wherein, No. 1 port is the oil inlet port, No. 2 port and No. 3 port are working oil ports, and No. 4 port is the oil inlet port. For the oil return port, the No. 4 port of the reversing valve 2 is connected to the hydraulic oil tank 1 , and the No. 1 port of the reversing valve 2 is connected to the oil outlet of the plunger pump 7 . The diverter valve 3 is provided with a No. 1 port, a No. 2 port and a No. 3 port, wherein the No. 1 port is the oil inlet, the No. 2 port and the No. 3 port are the oil outlet ports, and the No. 1 port of the diverter valve 3 is connected. Port 2 of the reversing valve 2. The number of the turbine box 4, the rotary motor 5 and the two-way overload valve 6 is two, including the turbine box I4-I, the turbine box II4-II, the rotary motor I5-I, the rotary motor II5-II, and the two-way overload valve I6 -I and two-way overload valve II6-II, two-way overload valve I6-I and two-way overload valve II6-II have ports 1, 2, 3 and 4 respectively, of which port 1 is the oil inlet , No. 2 and No. 3 ports are the oil outlet, No. 4 port is the oil return port, the No. 2 port of the diverter valve 3 is connected to the No. 1 port of the two-way overload valve I6-I, and the No. 3 port of the diverter valve 3 The port is connected to the No. 1 port of the two-way overload valve II6-II, and the No. 2 and No. 3 ports of the two-way overload valve I6-I are connected to the rotary motor I5-I, and the rotary motor I5-I is connected to the turbine box through spline engagement. I4-I, the No. 2 and No. 3 ports of the two-way overload valve II6-II are connected to the rotary motor II5-II, and the rotary motor II5-II is connected to the turbine box II4-II through spline engagement, and the two-way overload valve I6- Port I and port 4 of the two-way overload valve II6-II are combined and connected to port 3 of the reversing valve 2. The reversing valve 2 is also provided with a Y1 electromagnet and a Y2 electromagnet.

The concrete working process of the present invention is:

The rotation of the rotary ring gear of the motor grader is realized by the rotation of the two turbine boxes I and II which are meshed and connected with the gears. When the Y1 electromagnet of the reversing valve 2 is energized, the high-pressure oil output from the plunger pump 7 enters the port 1 of the diverter valve 3 through the No. 1 port and the No. 2 port of the reversing valve 2. Since the diverter valve 3 has equal The high-pressure oil flowing through the diverter valve 3 is evenly divided into two parts, and is output from the 2nd and 3rd ports of the diverter valve 3, and the pressure is the same. The 2nd port of the diverter valve 3 The oil enters the rotary motor I5-I through the ports 1 and 2 of the two-way overload valve I6-I, and the oil from the port 3 of the diverter valve 3 enters through the ports 1 and 2 of the two-way overload valve II6-II. The rotary motor II5-II, the rotary motor I5-I and the rotary motor II5-II are all connected with the turbine box I4-I and the turbine box II4-II through spline engagement, so that the turbine box I4-I and the turbine box II4-II The output torque is the same, driving the rotary ring gear together, and finally the oil returns to the hydraulic oil tank 1 through the reversing valve 2;

When the Y2 electromagnet of the reversing valve 2 is energized, the high-pressure oil output by the plunger pump 7 passes through the ports 1 and 3 of the reversing valve 2, and the ports 4 and 3 of the two-way overload valve I6-I in turn. port, port 4 and port 3 of the two-way overload valve II6-II, enter the swing motor I5-I and swing motor II5-II, and the low-pressure oil flowing out of the swing motor I5-I and swing motor II5-II passes through the two-way overload. Ports 2 and 1 of valve I6-I, and ports 2 and 1 of two-way overload valve II6-II enter the diverter valve 3. Since the diverter valve 3 has the dual functions of equal distribution and current collection, it flows through the diverter valve. The two low-pressure oils of 3 are evenly distributed and the pressure is the same, so as to ensure that the flow and differential pressure of the rotary motor I5-I and the rotary motor II5-II are consistent. Both the rotary motor I5-I and the rotary motor II5-II pass the spline The meshing is connected with the turbine box I4-I and the turbine box II4-II, so that the output torque of the turbine box I4-I and the turbine box II4-II are the same, and jointly drive the rotary ring gear, and finally the oil returns through the reversing valve 2. Hydraulic tank 1.

During the operation, the electromagnets Y1 and Y2 of the reversing valve 2 are not energized. In this case, the turbine box I4-I and the turbine box II4-II are overloaded and slipped, and the swing motor I5-I and the swing motor II5-II will also rotate. The oil flows between the two oil ports of the swing motor I5-I and between the two oil ports of the swing motor II5-II through the two-way overload valve I6-I and the two-way overload valve II6-II connected to it to avoid the swing Motor I5-I and rotary motor II5-II are damaged by dry grinding.

The above is only the preferred embodiment of the present invention, it should be pointed out: for those skilled in the art, under the premise of not departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (9)

1. A hydraulic system for controlling multiple rotary motors of a motor grader, characterized in that it comprises a hydraulic oil tank (1), a reversing valve (2), a diverter valve (3), a plunger pump (7), an oil suction filter (8) ), multiple turbine boxes (4), multiple rotary motors (5) and multiple two-way overload valves (6); The hydraulic oil tank (1) is respectively connected to the reversing valve (2) and the oil suction filter (8), the oil suction filter (8) is connected to the oil suction port of the plunger pump (7), and the outlet of the plunger pump (7) The oil port is connected to the reversing valve (2), the reversing valve (2) is connected to the oil inlet of the diverter valve (3), and the oil outlet of the diverter valve (3) is respectively connected to a plurality of two-way overload valves (6), and many The two-way overload valves (6) are connected to the reversing valve (2) after confluence, each two-way overload valve (6) is connected to a rotary motor (5), and each rotary motor (5) is engaged with a turbine box (4). ). 2. The multiple slewing motor control hydraulic system of a motor grader according to claim 1, wherein, The reversing valve (2) is selected as a three-position four-way valve, the oil inlet of the three-position four-way valve is connected with the oil outlet of the plunger pump (7), and the oil return port of the three-position four-way valve is connected with the oil outlet of the plunger pump (7). Connected to the hydraulic oil tank (1), one working oil port of the three-position four-way valve is connected to the oil inlet of the shunt valve (3), and the other working oil port is confluent with multiple two-way overload valves (6). oil connection. 3 . The hydraulic system for controlling multiple rotary motors of a motor grader according to claim 2 , wherein the diverter valve ( 3 ) is provided with a plurality of outflow ports, and each outflow port is correspondingly connected to a bidirectional Overload valve (6). 4. The hydraulic system for controlling multiple rotary motors of a motor grader according to claim 3, wherein the number of the turbine box (4), the rotary motor (5) and the two-way overload valve (6) is two , including turbine box I (4-I), turbine box II (4-II), swing motor I (5-I), swing motor II (5-II), two-way overload valve I (6-I) and two-way overload valve I (6-I) Overload valve II (6-II), the diverter valve (3) is provided with two oil outlets, one oil outlet is connected to the oil inlet of the two-way overload valve I (6-I), and the other oil outlet is connected The oil inlet of the two-way overload valve II (6-II), the oil outlet of the two-way overload valve I (6-I) is connected to the rotary motor I (5-I), the two-way overload valve II (6-II) The oil outlet is connected to the rotary motor II (5-II), and the oil circuit after the confluence of the two-way overload valve I (6-I) and the two-way overload valve II (6-II) is connected to the working oil port of the reversing valve (2). . 5. The control method for controlling a hydraulic system of a plurality of rotary motors of a motor grader according to claim 1, wherein, The method includes: Control the plunger pump to pump the hydraulic oil in the hydraulic oil tank, convert the hydraulic oil into high-pressure oil, and then pump it to the reversing valve; controlling the reversing valve to be energized to pump high pressure oil to the diverter valve; Use the diverter valve to divert the flow of oil through the two-way overload valve to the same oil flow and oil pressure, so that the oil flow and differential pressure of each rotary motor are consistent, and the torque output by each turbine box is consistent; The oil after the control work is returned to the hydraulic oil tank through the oil circuit and the reversing valve after the confluence of multiple two-way overload valves. 6. The control method for controlling a hydraulic system of a plurality of rotary motors of a motor grader according to claim 2, wherein, Control the plunger pump to pump the hydraulic oil in the hydraulic oil tank, convert the hydraulic oil into high-pressure oil, and then pump it to the reversing valve; The reversing valve is controlled to be energized, so as to pump the high-pressure oil to the oil circuit where the plurality of bidirectional overload valves are confluent. 7. The control method of a plurality of rotary motors of a motor grader according to claim 3 to control the hydraulic system, The diverter valve is used to divert the flow of oil through the two-way overload valves to the same oil flow and oil pressure, so that the oil flow and differential pressure of each rotary motor are consistent, and the torque output by each turbine box is consistent. 8. The control method for controlling the hydraulic system of a plurality of rotary motors of a motor grader according to claim 4, wherein, The oil after control work is returned to the hydraulic oil tank through the diverter valve and the reversing valve. 9. The control method for controlling a hydraulic system of a plurality of rotary motors of a motor grader according to claim 4, wherein, When the turbine box is overloaded and slipped, the reversing valve is controlled not to be energized, so that the hydraulic oil only flows between the two-way overload valve and the swing motor.

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