A hydraulic system for a multi-functional implement of a construction machine

Abstract

The application discloses an engineering machine multifunctional implement hydraulic system, which comprises a hydraulic oil tank, a pilot pump, a route selection valve, a multifunctional implement, an accumulator selection valve, a low-pressure accumulator and a high-pressure accumulator. The A port of the multifunctional implement is connected with a first main oil path, the B port of the multifunctional implement is connected with a second main oil path, the Pi port of a reversing valve is connected with the upper oil port of the pilot pump, the lower oil port of the pilot pump is connected with the hydraulic oil tank, the Pa port of the reversing valve is connected with the Pi port of the accumulator selection valve, the T port of a working valve is connected with the hydraulic oil tank, the A port and the P port of the working valve are located on the second main oil path, the D port of the working valve is connected with the hydraulic oil tank, the D port of the accumulator selection valve is connected with the hydraulic oil tank, the B1 port of the accumulator selection valve is connected with the upper oil port of the low-pressure accumulator, the B2 port of the accumulator selection valve is connected with the upper oil port of the high-pressure accumulator, the A1 port of the accumulator selection valve is connected with the second main oil path, and the A2 port of the accumulator selection valve is connected with the first main oil path.

Description

Technical Field

[0001] This invention relates to a hydraulic system for multifunctional engineering machinery, belonging to the technical field of hydraulic systems for engineering machinery. Background Technology

[0002] Multifunctional machinery refers to engineering machinery that, by changing different auxiliary devices or tools, can perform operations such as crushing, drilling, and grabbing, thereby improving the adaptability and efficiency of engineering machinery.

[0003] Traditional hydraulic systems for multi-functional construction machinery, such as Figure 2 As shown, the large chamber of the multi-functional tool is directly connected to the multi-functional tool reversing valve through a ball valve. Under crushing conditions, the breaker hammer performs rapid reciprocating impact motion. The oil circuit pressure of the large chamber of the multi-functional tool fluctuates greatly, which cannot reduce the pressure impact caused by the crushing action, and easily leads to a reduction in the service life of the breaker hammer and hydraulic system. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a multi-functional hydraulic system for engineering machinery, thereby solving the problem of pressure fluctuations in the large-cavity oil circuit causing damage to the hydraulic breaker and hydraulic system under crushing conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic system for a multi-functional engineering machinery tool includes a hydraulic oil tank, a pilot pump, a route selector valve, a multi-functional tool, an accumulator selector valve, a low-pressure accumulator, and a high-pressure accumulator.

[0007] The large-cavity oil port A of the multi-functional machine is connected to the first main oil circuit, and the small-cavity oil port B of the multi-functional machine is connected to the second main oil circuit.

[0008] The selector valve includes a directional valve and a working valve. The pilot port Pi of the directional valve is connected to the outlet of the pilot pump, the inlet of the pilot pump is connected to the hydraulic oil tank, the outlet of the directional valve is connected to the hydraulic oil tank, the directional port Pa of the directional valve is connected to the control port of the working valve and the control port Pi of the accumulator selector valve, the return port T of the working valve is connected to the hydraulic oil tank, the working port A and the main inlet P of the working valve are located on the second main oil line, and the spring chamber port D of the working valve is connected to the hydraulic oil tank.

[0009] The spring chamber port D of the accumulator selector valve is connected to the hydraulic oil tank. The working port B1 of the accumulator selector valve is connected to the upper port of the low-pressure accumulator. The working port B2 of the accumulator selector valve is connected to the upper port of the high-pressure accumulator. The working port A1 of the accumulator selector valve is connected to the second main oil circuit. The working port A2 of the accumulator selector valve is connected to the first main oil circuit.

[0010] When the solenoid of the reversing valve is energized, the pilot port Pi of the reversing valve is connected to the reversing port Pa, and the working port A of the working valve is connected to the return port T. In this state, the accumulator selection valve is in the right position, and the working port A1 of the accumulator selection valve is connected to the working port B1 of the accumulator selection valve, and the working port A2 of the accumulator selection valve is connected to the working port B2 of the accumulator selection valve.

[0011] When the solenoid of the directional valve is de-energized, the working port A of the working valve is connected to the main inlet port P. In this state, the accumulator selector valve is in the left position, and the B1 and B2 ports of the accumulator selector valve are connected to the hydraulic oil tank.

[0012] Furthermore, the aforementioned also includes the main pump and the multi-functional tool reversing valve.

[0013] The T port of the multi-functional tool reversing valve is connected to the hydraulic oil tank, the working oil port A of the multi-functional tool reversing valve is connected to the first main oil circuit, the working oil port B of the multi-functional tool reversing valve is connected to the main oil inlet P of the selector valve, the P port of the multi-functional tool reversing valve is connected to the main pump outlet, and the main pump inlet is connected to the hydraulic oil tank.

[0014] When the left solenoid of the multi-function reversing valve is energized, the working oil ports A and P of the multi-function reversing valve are connected, and the working oil ports B and T of the multi-function reversing valve are connected.

[0015] When the right solenoid of the multi-function reversing valve is energized, the working oil ports A and T of the multi-function reversing valve are connected, and the working oil ports B and P of the multi-function reversing valve are connected.

[0016] Furthermore, the aforementioned also includes a controller, with the left and right electromagnets of the multi-functional machine reversing valve connected to the controller respectively.

[0017] Furthermore, the aforementioned also includes a radiator, the upper oil port of which is connected to the T port of the multi-functional machine reversing valve and the return oil port T of the route selection valve, respectively, and the lower oil port of which is connected to the hydraulic oil tank.

[0018] Furthermore, the aforementioned also includes a first ball valve, the left port of which is connected to the first main oil circuit, and the right port of which is connected to the large cavity port A of the multi-functional machine.

[0019] Furthermore, the aforementioned also includes a second ball valve, the left port of which is connected to the second main oil circuit, and the right port of which is connected to the small cavity port B of the multi-functional machine.

[0020] The beneficial effects achieved by this invention are as follows:

[0021] Adding a high-pressure accumulator to the main hydraulic circuit of the multi-functional implement, and making the connection and disconnection between the main hydraulic circuit and the accumulator controllable, can reduce the pressure shock caused by the crushing action, while adapting to other implement modes and reducing the risk of reduced service life of the breaker and hydraulic system. Attached Figure Description

[0022] Figure 1 This invention relates to a multi-functional hydraulic system for machinery;

[0023] Figure 2 It is the hydraulic system of existing multi-functional excavators.

[0024] The meanings of the labels in the attached diagram are as follows: 1-Hydraulic oil tank; 2-Main pump; 3-Pilot pump; 4-Multi-function tool reversing valve; 5-Controller; 6-Route selector valve; 61-Reversing valve; 62-Working valve; 7-First ball valve; 8-Second ball valve; 9-Multi-function tool; 10-Accumulator selector valve; 11-Low-pressure accumulator; 12-High-pressure accumulator; 13-Radiator; 14-Accumulator. Detailed Implementation

[0025] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0026] This embodiment discloses a hydraulic system for multi-functional engineering machinery tools, such as... Figure 1 As shown, it includes a hydraulic oil tank 1, a main pump 2, a pilot pump 3, a multi-functional tool reversing valve 4, a controller 5, a route selection valve 6, a first ball valve 7, a second ball valve 8, a multi-functional tool 9, an accumulator selection valve 10, a low-pressure accumulator 11, a high-pressure accumulator 12, and a radiator 13.

[0027] The oil outlet of the main pump 2 is connected to the P port of the multi-functional tool reversing valve 4, and the oil inlet of the main pump 2 is connected to the hydraulic oil tank 1.

[0028] The oil outlet of the pilot pump 3 is connected to the pilot oil port Pi of the selector valve 6, and the oil inlet of the pilot pump 3 is connected to the hydraulic oil tank 1.

[0029] The T port of the multi-functional tool reversing valve 4 is connected to the upper oil port of the radiator 13. The working oil port A of the multi-functional tool reversing valve 4 is connected to the left oil port of the first ball valve 7, and also to the working oil port A2 of the accumulator selector valve 10. The working oil port B of the multi-functional tool reversing valve 4 is connected to the main oil inlet P of the selector valve 6. The left and right electromagnets of the multi-functional tool reversing valve 4 are respectively connected to the controller 5. When the controller 5 energizes the left electromagnet of the multi-functional tool reversing valve 4, the multi-functional tool reversing valve 4 operates. In the left position, the working port A of the multi-functional tool reversing valve 4 is connected to the P port of the multi-functional tool reversing valve 4, and the working port B of the multi-functional tool reversing valve 4 is connected to the T port of the multi-functional tool reversing valve 4; when the controller 5 controls the right electromagnet of the multi-functional tool reversing valve 4 to be energized, the multi-functional tool reversing valve 4 operates in the right position, and the working port A of the multi-functional tool reversing valve 4 is connected to the T port of the multi-functional tool reversing valve 4, and the working port B of the multi-functional tool reversing valve 4 is connected to the P port of the multi-functional tool reversing valve 4.

[0030] The pilot port Pi of the directional control valve 61 is connected to the outlet of the pilot pump 3. The outlet of the directional control valve 61 is connected to the hydraulic oil tank. The reversing port Pa of the directional control valve 61 is connected to the control port Pi of the working valve 62 and the control port Pi of the accumulator selector valve 10, respectively. The return port T of the working valve 62 is connected to the upper port of the radiator 13. The working port A of the working valve 62 is connected to the left port of the second ball valve 8 and also to the working port A1 of the accumulator selector valve 10. The spring chamber oil port D is connected to the hydraulic oil tank 1; when the solenoid of the reversing valve 61 is energized, the working valve 62 is in the upper position. At this time, the pilot oil port Pi and the reversing oil port Pa of the reversing valve 61 are connected, and the working oil port A and the return oil port T of the working valve 62 are connected. The pilot oil passes through the pilot oil port Pi of the reversing valve 61, the reversing oil port Pa of the reversing valve 61, and the control port Pi of the accumulator selection valve 10 in sequence, so that the accumulator selection valve 10 is in the right position.

[0031] The right oil port of the first ball valve 7 is connected to the large chamber oil port A of the multi-functional tool 9, and the right oil port of the second ball valve 8 is connected to the small chamber oil port B of the multi-functional tool 9.

[0032] The spring chamber port D of the accumulator selector valve 10 is connected to the hydraulic oil tank 1. The working port B1 of the accumulator selector valve 10 is connected to the upper port of the low-pressure accumulator 11. The working port B2 of the accumulator selector valve 10 is connected to the upper port of the high-pressure accumulator 12. When the accumulator selector valve 10 is in its original position (working in the left position), the low-pressure accumulator 11 and the high-pressure accumulator 12 are connected to the hydraulic oil tank 1. When the accumulator selector valve 10 is switched to the right position, the working port A1 of the accumulator selector valve 10 is connected to the working port B1 of the accumulator selector valve 10, and the working port A2 of the accumulator selector valve 10 is connected to the working port B2 of the accumulator selector valve 10.

[0033] The lower oil port of radiator 13 is connected to hydraulic oil tank 1.

[0034] The working principle of this invention, as configured in this way, is as follows:

[0035] After the excavator starts, if it switches to the crushing mode, the solenoid of the reversing valve 61 is energized and reversed. The pilot pump 3 outputs pressurized oil to switch the working valve 62 to the upper position, and at the same time, it passes through the selector valve 6 to switch the accumulator selector valve 10 to the right position. If the left solenoid of the multi-function implement reversing valve 4 is energized, the hydraulic oil output by the main pump 2 enters the high-pressure accumulator 12 through the multi-function implement reversing valve 4, and then enters the large chamber of the multi-function implement 9 through the first ball valve 7. The hydraulic oil in the small chamber of the multi-function implement 9 enters the low-pressure accumulator 11 through the second ball valve 8 and the accumulator selector valve 10, and then enters the hydraulic oil tank 1 through the selector valve 6 and the radiator 13, realizing the crushing action. The accumulator reduces the pressure impact of the main oil circuit of the multi-function implement.

[0036] If switched to another mode, the selector valve 6 and accumulator selector valve 10 remain in their original positions. If the left solenoid of the multi-function tool reversing valve 4 is energized, the hydraulic oil output from the main pump 2 enters the large chamber of the multi-function tool 9 through the multi-function tool reversing valve 4 and the first ball valve 7. The hydraulic oil in the small chamber of the multi-function tool 9 enters the hydraulic oil tank 1 through the second ball valve 8, the selector valve 6, the multi-function tool reversing valve 4, and the radiator 13, thus achieving the extension action of the cylinder. If the right solenoid of the multi-function tool reversing valve 4 is energized, the hydraulic oil output from the main pump 2 enters the small chamber of the multi-function tool 9 through the multi-function tool reversing valve 4, the selector valve 6, and the second ball valve 8. The hydraulic oil in the large chamber of the multi-function tool 9 enters the hydraulic oil tank 1 through the first ball valve 7, the multi-function tool reversing valve 4, and the radiator 13, thus achieving the retraction action of the cylinder. Under this condition, the low-pressure accumulator 11 and the high-pressure accumulator 12 remain disconnected from the main oil circuit of the multi-function tool.

[0037] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic system for multi-functional engineering machinery, characterized in that, Includes hydraulic oil tank (1), pilot pump (3), route selector valve (6), multi-functional tool (9), accumulator selector valve (10), low-pressure accumulator (11), and high-pressure accumulator (12); The large cavity oil port A of the multi-functional tool (9) is connected to the first main oil circuit, and the small cavity oil port B of the multi-functional tool (9) is connected to the second main oil circuit; The selector valve (6) includes a directional valve (61) and a working valve (62). The pilot port Pi of the directional valve (61) is connected to the outlet of the pilot pump (3). The inlet of the pilot pump (3) is connected to the hydraulic oil tank (1). The outlet of the directional valve (61) is connected to the hydraulic oil tank (1). The directional port Pa of the directional valve (61) is connected to the control port of the working valve (62) and the control port Pi of the accumulator selector valve (10) respectively. The return port T of the working valve (62) is connected to the hydraulic oil tank (1). The working port A and the main inlet P of the working valve (62) are located on the second main oil line. The spring cavity port D of the working valve (62) is connected to the hydraulic oil tank (1). The spring chamber port D of the accumulator selection valve (10) is connected to the hydraulic oil tank (1), the working port B1 of the accumulator selection valve (10) is connected to the upper port of the low-pressure accumulator (11), the working port B2 of the accumulator selection valve (10) is connected to the upper port of the high-pressure accumulator (12), the working port A1 of the accumulator selection valve (10) is connected to the second main oil circuit, and the working port A2 of the accumulator selection valve (10) is connected to the first main oil circuit. When the electromagnet of the reversing valve (61) is energized, the pilot port Pi of the reversing valve (61) is connected to the reversing port Pa, and the working port A of the working valve (62) is connected to the return port T. In this state, the accumulator selection valve (10) is working in the right position, and the working port A1 of the accumulator selection valve (10) is connected to the working port B1 of the accumulator selection valve (10), and the working port A2 of the accumulator selection valve (10) is connected to the working port B2 of the accumulator selection valve (10). When the electromagnet of the reversing valve (61) is de-energized, the working port A of the working valve (62) is connected to the main inlet port P. In this state, the accumulator selection valve (10) is in the left position, and the B1 port and B2 port of the accumulator selection valve (10) are connected to the hydraulic oil tank (1).

2. The hydraulic system for multi-functional engineering machinery and tools according to claim 1, characterized in that, It also includes the main pump (2) and the multi-functional tool reversing valve (4), The T port of the multi-functional tool reversing valve (4) is connected to the hydraulic oil tank (1), the working oil port A of the multi-functional tool reversing valve (4) is connected to the first main oil circuit, the working oil port B of the multi-functional tool reversing valve (4) is connected to the main oil inlet P of the selector valve (6), the P port of the multi-functional tool reversing valve (4) is connected to the oil outlet of the main pump (2), and the oil inlet of the main pump (2) is connected to the hydraulic oil tank (1). When the left electromagnet of the multi-functional tool reversing valve (4) is energized, the working oil ports A and P of the multi-functional tool reversing valve (4) are connected, and the working oil ports B and T of the multi-functional tool reversing valve (4) are connected. When the right electromagnet of the multi-functional tool reversing valve (4) is energized, the working oil ports A and T of the multi-functional tool reversing valve (4) are connected, and the working oil ports B and P of the multi-functional tool reversing valve (4) are connected.

3. The hydraulic system for multi-functional engineering machinery and tools according to claim 2, characterized in that, It also includes a controller (5), and the left and right electromagnets of the multi-functional machine reversing valve (4) are respectively connected to the controller (5).

4. The hydraulic system for multi-functional engineering machinery and tools according to claim 2, characterized in that, It also includes a radiator (13), the upper oil port of which is connected to the T port of the multi-functional machine reversing valve (4) and the return oil port T of the route selection valve (6), and the lower oil port of the radiator (13) is connected to the hydraulic oil tank (1).

5. The hydraulic system for multi-functional engineering machinery and implements according to claim 1, characterized in that, It also includes a first ball valve (7), the left port of the first ball valve (7) is connected to the first main oil circuit, and the right port of the first ball valve (7) is connected to the large cavity port A of the multi-functional tool (9).

6. The hydraulic system for multi-functional engineering machinery and implements according to claim 1, characterized in that, It also includes a second ball valve (8), the left port of the second ball valve (8) is connected to the second main oil circuit, and the right port of the second ball valve (8) is connected to the small cavity port B of the multi-functional tool (9).

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