A dual-power-source open-close dual-loop rotor drive system and a milling machine

Abstract

The present invention discloses a dual-power-source open-close dual-loop rotor drive system and a milling machine, which includes a closed-loop rotor drive system powered by an engine and an open-loop rotor drive system powered by an electric motor; the engine is connected to a rotor drive pump I, and the rotor drive pump I is respectively connected to a rotor motor through an electromagnetic reversing valve I and an electromagnetic reversing valve II to form the closed-loop rotor drive system; the electric motor is connected to a rotor drive pump II, the rotor drive pump II is connected to the oil inlet of the rotor motor through an electromagnetic reversing valve III, and the oil return port of the rotor motor is connected to a hydraulic oil tank through an electromagnetic reversing valve IV to form the open-loop rotor drive system. The dual-loop rotor drive system of the present invention can meet the construction requirements of different working conditions of the milling machine, and is more convenient and labor-saving for replacing rotor cutter heads, saves energy, and has high safety.

Description

Technical Field

[0001] The present invention relates to a dual-power source open-close dual-loop rotor drive system and a milling machine, belonging to the technical field of electro-hydraulic control of milling machines. Background Art

[0002] The milling rotor is the core component of a milling machine, and an advanced and reliable rotor drive system is the core system affecting the performance of the whole machine. The existing rotor drive systems of milling machines are mainly divided into two types: mechanical drive and hydraulic drive. The hydraulic drive is increasingly widely used because of its advantages such as small installation space, diverse control methods, low use and maintenance costs, etc.

[0003] Most of the existing milling machine rotor hydraulic drive systems on the market are quantitative pump-driven quantitative motors. This drive method has low cost, but it cannot meet the construction requirements of different working conditions. And when replacing the rotor cutter head, only manual rotation of the rotor can be relied on, which is time-consuming and laborious. If the engine is started to rotate the rotor, not only will energy be wasted, but also a lot of noise will be generated, with great potential safety hazards. Summary of the Invention

[0004] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a dual-power source open-close dual-loop rotor drive system and a milling machine.

[0005] In order to achieve the above object, a dual-power source open-close dual-loop rotor drive system adopted by the present invention includes a closed-loop rotor drive system powered by an engine and an open-loop rotor drive system powered by an electric motor;

[0006] The engine is connected to a rotor drive pump I, and the rotor drive pump I is respectively connected to a rotor motor through an electromagnetic directional valve I and an electromagnetic directional valve II to form the closed-loop rotor drive system;

[0007] The electric motor is connected to a rotor drive pump II, the rotor drive pump II is connected to the oil inlet of the rotor motor through an electromagnetic directional valve III, and the oil return port of the rotor motor is connected to a hydraulic oil tank through an electromagnetic directional valve IV to form the open-loop rotor drive system.

[0008] As an improvement, an overflow valve is connected to the oil outlet of the rotor drive pump II.

[0009] As an improvement, an oil suction filter is connected to the oil suction port of the rotor drive pump II.

[0010] As an improvement, it further includes a display and a controller, and the display is connected to the communication port of the controller;

[0011] The output end of the controller is respectively connected to an electromagnetic directional valve I, an electromagnetic directional valve II, an electromagnetic directional valve III, an electromagnetic directional valve IV and a servo control valve.

[0012] As an improvement, the output end of the controller is also connected to a relay.

[0013] As an improvement, a temperature control switch is installed on the motor.

[0014] Finally, the present invention also provides a milling machine, on which the double-power-source open-close double-loop rotor drive system is installed.

[0015] Compared with the prior art, the double-loop rotor drive system of the present invention can meet the requirements for the rotor speed under different working conditions of the milling machine, so that the construction efficiency is always in the optimal state. Moreover, when replacing the rotor cutter head, the prior method of relying on manual rotation of the rotor is abandoned, and the rotor can be rotated with one key without starting the engine, which is safe and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the electro-hydraulic control schematic diagram of the present invention;

[0017] In the figure: 1, engine; 2, rotor drive pump I; 3, electromagnetic directional valve I; 4, electromagnetic directional valve II; 5, electromagnetic directional valve III; 6, rotor motor; 7, electromagnetic directional valve IV; 8, rotor drive pump II; 9, oil suction filter; 10, motor; 11, temperature control switch; 12, relay; 13, relief valve; 14, servo control valve; 15, controller; 16, display; 17, hydraulic oil tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0020] As Figure 1 shown, a double-power-source open-close double-loop rotor drive system includes an engine 1, a rotor drive pump I 2, an electromagnetic directional valve I 3, an electromagnetic directional valve II 4, an electromagnetic directional valve III 5, a rotor motor 6, an electromagnetic directional valve IV 7, a rotor drive pump II 8, a motor 10 and a hydraulic oil tank 17;

[0021] The engine 1 is connected to the rotor drive pump I 2. The rotor drive pump I 2 is respectively connected to the rotor motor 6 through the electromagnetic directional valve I 3 and the electromagnetic directional valve II 4, forming a closed rotor drive system with the engine 1 as the power source;

[0022] The electric motor 10 is connected to the rotor drive pump II 8. The rotor drive pump II 8 is connected to the oil inlet of the rotor motor 6 through the electromagnetic directional valve III 5. The oil return port of the rotor motor 6 is connected to the hydraulic oil tank 17 through the electromagnetic directional valve IV 7, forming an open rotor drive system with the electric motor 10 as the power source.

[0023] As an improvement of the embodiment, an overflow valve 13 is connected to the oil outlet of the rotor drive pump II 8, and the other end of the overflow valve 13 is connected to the hydraulic oil tank 17 to prevent overpressure of the open rotor drive system with the electric motor 10 as the power source through the overflow valve 13; an oil suction filter 9 is connected to the oil suction port of the rotor drive pump II 8, and the other end of the oil suction filter 9 is connected to the hydraulic oil tank 17 to ensure the cleanliness of the entire hydraulic system through the oil suction filter 9.

[0024] As an improvement of the embodiment, it further includes a display 16 and a controller 15. The display 16 is connected to the communication port of the controller 15. The display 16 is used to select a recommended rotor speed value or a custom rotor speed value, and the controller 15 is used to achieve interlock of two working modes through program setting;

[0025] The output end of the controller 15 is respectively connected to the electromagnetic directional valve I 3, the electromagnetic directional valve II 4, the electromagnetic directional valve III 5, the electromagnetic directional valve IV 7, and the servo control valve 14 of the rotor drive pump I to realize the switching of rotor drive modes under different working conditions.

[0026] As an improvement of the embodiment, the output end of the controller 15 is also connected to a relay 12 to protect the electric motor 10 from overheating due to long-term power-on.

[0027] As an improvement of the embodiment, a temperature control switch 11 is installed on the electric motor 10, which automatically disconnects when the temperature reaches the set value and automatically resumes when the temperature drops below the set value, further preventing the electric motor from being burned out due to high temperature.

[0028] Embodiment 1

[0029] In this embodiment, the rotor drive pump I 2 is an electro-hydraulic proportional closed-loop variable piston pump, and the rotor motor 6 is an open / closed-loop fixed-displacement motor.

[0030] When the milling machine is performing milling operations, while ensuring that the engine 1 can always operate efficiently at the rated speed of the maximum output power, and meeting the construction requirements for the rotor speed under different working conditions of the milling machine, the present invention provides the following control methods:

[0031] Select the recommended rotor speed value or the custom rotor speed value on the display 16, start the engine 1, press the rotor start switch, and the display 16 will send the set rotor speed signal to the controller 15. The controller 15 outputs current signals with different current values to the servo control valve 14 of the rotor drive pump I, controlling the rotor drive pump I 2 to output high-pressure oil with different flow rates to the system;

[0032] At the same time, the controller 15 controls the electromagnetic directional valve I 3, the electromagnetic directional valve II 4, the electromagnetic directional valve III 5, the electromagnetic directional valve IV 7, and the motor 10 to be in a non-energized state;

[0033] At this time, the high-pressure oil output by the rotor drive pump I 2 drives the rotor motor 6 to rotate through the electromagnetic directional valve I 3. At the same time, the low-pressure oil discharged by the rotor motor 6 returns to the low-pressure side of the rotor drive pump I 2 through the normally open electromagnetic directional valve II 4, thus forming a closed rotor drive system with the engine 1 as the power source.

[0034] Embodiment 2

[0035] When the milling machine needs to change the tool after the operation is completed, there is no need to start the engine 1. Press the rotor slow rotation switch, the relay 12 is energized, the motor 10 is energized, the rotor drive pump II 8 works, and at the same time the controller 15 outputs a current signal to control the electromagnetic directional valve I3, the electromagnetic directional valve II 4, the electromagnetic directional valve III 5, and the electromagnetic directional valve IV 7 to be energized simultaneously;

[0036] At this time, the oil circuit between the rotor drive pump I 2 and the rotor motor 6 is cut off. The rotor drive pump II 8 sucks oil from the hydraulic oil tank 17 through the oil suction filter 9, and at the same time outputs pressure oil to drive the rotor motor 6 to rotate through the electromagnetic directional valve III 5. The return oil of the rotor motor 6 flows back to the hydraulic oil tank 17 through the electromagnetic directional valve IV 7; during this working process, if the outlet pressure of the rotor drive pump II 8 reaches the set pressure of the relief valve 13, the oil will flow to the hydraulic oil tank 17 through the relief valve 13 to avoid damage to the components in the hydraulic system due to excessive system pressure.

[0037] In addition, if the continuous working time of the motor 10 exceeds the set value, the controller 15 will output a signal to control the relay 12 to close and the motor 10 will stop working. This control method is mainly to prevent the motor 10 from burning out due to overheating caused by too long continuous working time;

[0038] In addition, if the continuous working time of the motor 10 does not exceed the set value, but the motor temperature has reached the set temperature of the temperature control switch 11, the temperature control switch 11 is cut off. When the temperature drops below the set value, the temperature control switch 11 automatically resumes, and at this time the power unit device resumes normal operation.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A milling machine, characterized in that, a double-power-source open-close double-loop rotor drive system is installed on the milling machine, and the double-power-source open-close double-loop rotor drive system includes a closed-loop rotor drive system powered by an engine (1) and an open-loop rotor drive system powered by a motor (10); the engine (1) is connected to a rotor drive pump I (2), and the rotor drive pump I (2) is respectively connected to a rotor motor (6) through an electromagnetic reversing valve I (3) and an electromagnetic reversing valve II (4), forming the closed-loop rotor drive system; the motor (10) is connected to a rotor drive pump II (8), the rotor drive pump II (8) is connected to the oil inlet of the rotor motor (6) through an electromagnetic reversing valve III (5), and the oil return port of the rotor motor (6) is connected to a hydraulic oil tank (17) through an electromagnetic reversing valve IV (7), forming the open-loop rotor drive system; the closed-loop rotor drive system is adopted during the milling operation of the milling machine, and the open-loop rotor drive system is adopted when the milling machine needs to change tools after the operation is completed.

2. The milling machine according to claim 1, characterized in that, an overflow valve (13) is connected to the oil outlet of the rotor drive pump II (8).

3. The milling machine according to claim 2, characterized in that, an oil suction filter (9) is connected to the oil suction port of the rotor drive pump II (8).

4. The milling machine according to claim 1, characterized in that, a temperature control switch (11) is installed on the motor (10).

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