Confluence oil source valve of external control pilot pump of excavator

Abstract

The invention discloses an excavator external control pilot pump confluence oil source valve. At present, an excavator pilot control system with a pilot pump in the market has the problem that the energy utilization rate of the pilot pump is low, and urgently needs to be solved. The purposes of improving the utilization rate of the pilot pump, improving the working efficiency and saving energy are achieved through the pressure reducing valve, the overflow valve and the flow collecting valve.

Description

Technical Field

[0001] The invention relates to a pilot control hydraulic system for an excavator, in particular to a confluence oil source valve for an externally controlled pilot pump of an excavator. Background Art

[0002] At present, the pilot control system of excavators with pilot pumps on the market has the problem of low energy utilization of the pilot pumps, which needs to be solved urgently. The purpose of the present invention is to improve the utilization of the pilot pump, improve work efficiency and save energy through a pressure reducing valve, a relief valve and a converging valve. Summary of the invention

[0003] The purpose of the present invention is to improve the utilization rate of the pilot pump, improve the working efficiency and save energy through a pressure reducing valve, a relief valve and a converging valve.

[0004] 1. The excavator external control pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, a converging valve pilot pump inlet oil passage 13, and a converging valve spring 14.

[0005] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the combining valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected to the upper end of the combining valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and is connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the combining valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the combining valve 12, the combining valve pilot pump oil channel 13 is connected with the right side of the combining valve 12, and the combining valve spring 14 is arranged at the upper end of the combining valve 12 and the pressure reducing valve outlet The oil channel 4 together determines the opening pressure of the merging valve 12. In the standby state, the hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8 to ensure that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to rise. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the pressure of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the sum of the pressure of the pressure reducing valve outlet oil channel 4 and the force of the merging valve spring 14, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0006] 2. The excavator external control pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, a converging valve pilot pump inlet oil passage 13, and a converging valve spring 14.

[0007] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the converging valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the converging valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the converging valve 12, the converging valve pilot pump oil channel 13 is connected with the right side of the converging valve 12, and the converging valve spring 14 is arranged at At the upper end of the merging valve 12, in the standby state, the hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8, ensuring that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to increase. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the pressure of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the force of the merging valve spring 14, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0008] 3. The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, and a converging valve pilot pump inlet oil passage 13.

[0009] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the combining valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and acts on the upper end of the combining valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the combining valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the combining valve 12, the combining valve pilot pump oil channel 13 is connected with the right side of the combining valve 12, and in the standby state, the The hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8. The pressure of the pressure reducing valve outlet oil channel 4 determines the opening pressure of the merging valve 12, ensuring that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to increase. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the sum of the pressures of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the pressure of the pressure reducing valve outlet oil channel 4, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0010] 4. The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, and a converging valve pilot pump inlet oil passage 13.

[0011] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the converging valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6 and the upper end of the converging valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side of the overflow valve 8 and its upper end, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the converging valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the converging valve 12, the converging valve pilot pump oil channel 13 is connected with the right side of the converging valve 12, and in the standby state, the oil from the pilot pump channel The hydraulic oil of 1 overflows through the relief valve 8 through the pressure reducing valve 3, the pressure reducing valve outlet oil passage 4 and the pilot oil overflow oil passage 6. At the same time, the hydraulic oil output from the pressure reducing valve outlet oil passage 4 acts on the upper end of the merging valve 12 to ensure that the merging valve pilot pump inlet oil passage 13 is not connected with the main pump oil passage 10. When the external pilot control system is working, the pressure of the main pump oil passage 10 begins to increase. When the sum of the pressure of the external control oil passage 11 and the force of the overflow valve spring 9 is higher than the pressure of the pilot oil overflow oil passage 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil passage 11 is greater than the pressure of the pressure reducing valve outlet oil passage 4, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil passage 10 with the merging valve pilot pump inlet oil passage 13, thereby realizing the merging of the pilot pump and the main pump.

[0012] 5. The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0013] Among them, the converging valve 11 has two functions of overflow and converging, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the converging valve pilot pump oil channel 12, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6 and the upper end of the converging valve 11, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the overflow oil channel on the right side of the converging valve 11, the overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the converging valve 11 and is connected to the low-pressure oil circuit, the overflow spring 10 is arranged at the lower end of the converging valve 11 to limit the overflow pressure, the main pump oil channel 8 is connected with the converging oil channel on the left side of the converging valve 11, the external control oil channel 9 is connected with the lower end of the converging valve 11, and the converging valve pilot pump oil channel 1 2 is connected to the right side confluence oil passage of the confluence valve 11. In the standby state, the hydraulic oil from the pilot pump inlet oil passage 1 overflows through the pressure reducing valve 3 and the pressure reducing valve outlet oil passage 4 through the pilot oil overflow oil passage 6 and the confluence valve 11 and acts on the upper end of the confluence valve 11, ensuring that the confluence valve pilot pump inlet oil passage 12 is not connected with the main pump oil passage 8. When the external pilot control system is working, the pressure of the main pump oil passage 8 increases. When the sum of the pressure of the external control oil passage 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the confluence valve 11, the valve core of the confluence valve 11 is pushed upward to gradually close the pilot oil overflow oil passage 6 and the overflow outlet oil passage 7 to prevent overflow, and at the same time, the main pump oil passage 8 and the confluence valve pilot pump inlet oil passage 12 are gradually connected to realize the confluence of the pilot pump and the main pump.

[0014] 6. The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0015] Among them, the combining valve 11 has two functions of overflow and combining. The pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the combining valve pilot pump oil channel 12. The pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4. The pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system. The pressure reducing valve return oil channel 5 is connected to the return oil. The pilot oil overflow oil channel 6 is connected with the overflow oil channel on the right side of the combining valve 11 and the pilot pump oil channel 1 and acts on the upper end of the combining valve 11. The overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the combining valve 11 and is connected to the low-pressure oil circuit. The overflow spring 10 is arranged at the lower end of the combining valve 11 to limit the overflow pressure. The main pump oil channel 8 is connected with the combining oil channel on the left side of the combining valve 11. The external control oil channel 9 is connected with the lower end of the combining valve 11. The combining valve pilot pump oil channel 12 is connected to the right side of the combining valve 11. The side merging oil channels are connected. In the standby state, the hydraulic oil from the pilot pump oil channel 1 provides an oil source for the external pilot control system through the pressure reducing valve 3 and the pressure reducing valve oil outlet channel 4, overflows through the pilot oil overflow oil channel 6 and the merging valve 11 and acts on the upper end of the merging valve 11, ensuring that the merging valve pilot pump oil channel 12 is not connected with the main pump oil channel 8. When the external pilot control system is working, the pressure in the main pump oil channel 8 increases. When the sum of the pressure of the external control oil channel 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the merging valve 11, the merging valve 11 begins to push the valve core upward to gradually close the pilot oil overflow oil channel 6 and the overflow outlet oil channel 7 to prevent overflow, and at the same time, the main pump oil channel 8 and the merging valve pilot pump oil channel 12 are gradually connected to achieve the merging of the pilot pump and the main pump.

[0016] 7. The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0017] Among them, the combining valve 11 has two functions of overflow and combining. The pilot pump oil channel 1 is respectively connected with the right side overflow oil channel of the combining valve 11, the pressure reducing valve oil inlet channel 2 and the combining valve pilot pump oil channel 12. The pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4. The pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6. The pressure reducing valve return oil channel 5 is connected to the return oil. The pilot oil overflow oil channel 6 acts on the upper end of the combining valve 11. The overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the combining valve 11 and is connected to the low-pressure oil circuit. The overflow spring 10 is arranged at the lower end of the combining valve 11 to limit the overflow pressure. The main pump oil channel 8 is connected with the combining oil channel on the left side of the combining valve 11. The external control oil channel 9 is connected with the lower end of the combining valve 11. The combining valve pilot pump oil channel 12 is connected to the right of the combining valve 11. The side merging oil channels are connected. In the standby state, the hydraulic oil from the pilot pump oil channel 1 provides an oil source for the external pilot control system through the pressure reducing valve 3 and the pressure reducing valve oil outlet channel 4 and acts on the upper end of the merging valve 11 through the pilot oil overflow oil channel 6, so that the oil in the pilot pump oil channel 1 overflows through the merging valve 11, ensuring that the merging valve pilot pump oil channel 12 is not connected to the main pump oil channel 8. When the external pilot control system is working, the pressure in the main pump oil channel 8 increases. When the sum of the pressure of the external control oil channel 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the merging valve 11, the spool of the merging valve 11 begins to move upward to gradually close the overflow channel of the merging valve 11 to prevent overflow. At the same time, the main pump oil channel 8 and the merging valve pilot pump oil channel 12 are gradually connected to achieve the merging of the pilot pump and the main pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0019] Figure 2 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0020] Figure 3 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0021] Figure 4 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0022] Figure 5 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0023] Figure 6 The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator.

[0024] Figure 7The present invention is a schematic diagram of the principle structure of an externally controlled pilot pump confluence oil source valve for an excavator. DETAILED DESCRIPTION

[0025] Embodiment 1 Figure 1 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, a converging valve pilot pump inlet oil passage 13, and a converging valve spring 14.

[0026] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the combining valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected to the upper end of the combining valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and is connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the combining valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the combining valve 12, the combining valve pilot pump oil channel 13 is connected with the right side of the combining valve 12, and the combining valve spring 14 is arranged at the upper end of the combining valve 12 and the pressure reducing valve outlet The oil channel 4 together determines the opening pressure of the merging valve 12. In the standby state, the hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8 to ensure that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to rise. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the pressure of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the sum of the pressure of the pressure reducing valve outlet oil channel 4 and the force of the merging valve spring 14, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0027] Embodiment 2 Figure 2 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, a converging valve pilot pump inlet oil passage 13, and a converging valve spring 14.

[0028] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the converging valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the converging valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the converging valve 12, the converging valve pilot pump oil channel 13 is connected with the right side of the converging valve 12, and the converging valve spring 14 is arranged at At the upper end of the merging valve 12, in the standby state, the hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8, ensuring that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to increase. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the pressure of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the force of the merging valve spring 14, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0029] Embodiment 3 Figure 3 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, and a converging valve pilot pump inlet oil passage 13.

[0030] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2, the pilot oil overflow oil channel 6 and the combining valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and acts on the upper end of the combining valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side and the upper end of the overflow valve 8, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the combining valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the combining valve 12, the combining valve pilot pump oil channel 13 is connected with the right side of the combining valve 12, and in the standby state, the The hydraulic oil from the pilot pump oil channel 1 overflows through the pilot oil overflow oil channel 6 and the overflow valve 8. The pressure of the pressure reducing valve outlet oil channel 4 determines the opening pressure of the merging valve 12, ensuring that the merging valve pilot pump oil channel 13 is not connected to the main pump oil channel 10. When the external pilot control system is working, the pressure of the main pump oil channel 10 begins to increase. When the sum of the pressure of the external control oil channel 11 and the force of the overflow valve spring 9 is greater than the sum of the pressures of the pilot oil overflow oil channel 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil channel 11 is greater than the pressure of the pressure reducing valve outlet oil channel 4, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil channel 10 and the merging valve pilot pump oil channel 13, thereby realizing the merging of the pilot pump and the main pump.

[0031] Embodiment 4 Figure 4 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, an overflow valve 8, an overflow valve spring 9, a main pump oil passage 10, an external control oil passage 11, a converging valve 12, and a converging valve pilot pump inlet oil passage 13.

[0032] Among them, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the converging valve pilot pump oil channel 13, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6 and the upper end of the converging valve 12, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the right side of the overflow valve 8 and its upper end, the overflow valve oil outlet channel 7 is connected with the left side of the overflow valve 8 and connected to the low-pressure oil circuit, the overflow valve spring 9 is arranged at the lower end of the overflow valve 8 to limit the overflow pressure, the main pump oil channel 10 is connected with the left side of the converging valve 12, the external control oil channel 11 is respectively connected with the lower ends of the overflow valve 8 and the converging valve 12, the converging valve pilot pump oil channel 13 is connected with the right side of the converging valve 12, and in the standby state, the oil from the pilot pump channel The hydraulic oil of 1 overflows through the relief valve 8 through the pressure reducing valve 3, the pressure reducing valve outlet oil passage 4 and the pilot oil overflow oil passage 6. At the same time, the hydraulic oil output from the pressure reducing valve outlet oil passage 4 acts on the upper end of the merging valve 12 to ensure that the merging valve pilot pump inlet oil passage 13 is not connected with the main pump oil passage 10. When the external pilot control system is working, the pressure of the main pump oil passage 10 begins to increase. When the sum of the pressure of the external control oil passage 11 and the force of the overflow valve spring 9 is higher than the pressure of the pilot oil overflow oil passage 6, the valve core of the overflow valve 8 begins to move upward and gradually closes the overflow of the overflow valve 8. When the pressure of the external control oil passage 11 is greater than the pressure of the pressure reducing valve outlet oil passage 4, the valve core of the merging valve 12 begins to move upward and gradually connects the main pump oil passage 10 with the merging valve pilot pump inlet oil passage 13, thereby realizing the merging of the pilot pump and the main pump.

[0033] Embodiment 5 Figure 5 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0034] Among them, the converging valve 11 has two functions of overflow and converging, the pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the converging valve pilot pump oil channel 12, the pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4, the pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6 and the upper end of the converging valve 11, the pressure reducing valve return oil channel 5 is connected to the return oil, the pilot oil overflow oil channel 6 is connected with the overflow oil channel on the right side of the converging valve 11, the overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the converging valve 11 and is connected to the low-pressure oil circuit, the overflow spring 10 is arranged at the lower end of the converging valve 11 to limit the overflow pressure, the main pump oil channel 8 is connected with the converging oil channel on the left side of the converging valve 11, the external control oil channel 9 is connected with the lower end of the converging valve 11, and the converging valve pilot pump oil channel 1 2 is connected to the right side confluence oil passage of the confluence valve 11. In the standby state, the hydraulic oil from the pilot pump inlet oil passage 1 overflows through the pressure reducing valve 3 and the pressure reducing valve outlet oil passage 4 through the pilot oil overflow oil passage 6 and the confluence valve 11 and acts on the upper end of the confluence valve 11, ensuring that the confluence valve pilot pump inlet oil passage 12 is not connected with the main pump oil passage 8. When the external pilot control system is working, the pressure of the main pump oil passage 8 increases. When the sum of the pressure of the external control oil passage 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the confluence valve 11, the valve core of the confluence valve 11 is pushed upward to gradually close the pilot oil overflow oil passage 6 and the overflow outlet oil passage 7 to prevent overflow, and at the same time, the main pump oil passage 8 and the confluence valve pilot pump inlet oil passage 12 are gradually connected to realize the confluence of the pilot pump and the main pump. Embodiment 6 Figure 6 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0035] Among them, the combining valve 11 has two functions of overflow and combining. The pilot pump oil channel 1 is connected with the pressure reducing valve oil inlet channel 2 and the combining valve pilot pump oil channel 12. The pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4. The pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system. The pressure reducing valve return oil channel 5 is connected to the return oil. The pilot oil overflow oil channel 6 is connected with the overflow oil channel on the right side of the combining valve 11 and the pilot pump oil channel 1 and acts on the upper end of the combining valve 11. The overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the combining valve 11 and is connected to the low-pressure oil circuit. The overflow spring 10 is arranged at the lower end of the combining valve 11 to limit the overflow pressure. The main pump oil channel 8 is connected with the combining oil channel on the left side of the combining valve 11. The external control oil channel 9 is connected with the lower end of the combining valve 11. The combining valve pilot pump oil channel 12 is connected to the right side of the combining valve 11. The side merging oil channels are connected. In the standby state, the hydraulic oil from the pilot pump oil channel 1 provides an oil source for the external pilot control system through the pressure reducing valve 3 and the pressure reducing valve oil outlet channel 4, overflows through the pilot oil overflow oil channel 6 and the merging valve 11 and acts on the upper end of the merging valve 11, ensuring that the merging valve pilot pump oil channel 12 is not connected with the main pump oil channel 8. When the external pilot control system is working, the pressure in the main pump oil channel 8 increases. When the sum of the pressure of the external control oil channel 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the merging valve 11, the merging valve 11 begins to push the valve core upward to gradually close the pilot oil overflow oil channel 6 and the overflow outlet oil channel 7 to prevent overflow, and at the same time, the main pump oil channel 8 and the merging valve pilot pump oil channel 12 are gradually connected to achieve the merging of the pilot pump and the main pump.

[0036] Embodiment 7 Figure 7 The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage 1, a pressure reducing valve oil inlet passage 2, a pressure reducing valve 3, a pressure reducing valve outlet oil passage 4, a pressure reducing valve return oil passage 5, a pilot oil overflow oil passage 6, an overflow valve outlet oil passage 7, a main pump oil passage 8, an external control oil passage 9, an overflow spring 10, a converging valve 11, and a converging valve pilot pump inlet oil passage 12.

[0037] Among them, the combining valve 11 has two functions of overflow and combining. The pilot pump oil channel 1 is respectively connected with the right side overflow oil channel of the combining valve 11, the pressure reducing valve oil inlet channel 2 and the combining valve pilot pump oil channel 12. The pressure reducing valve 3 supplies oil to the pressure reducing valve oil outlet channel 4. The pressure reducing valve oil outlet channel 4 provides an oil source for the external pilot control system and is connected with the pilot oil overflow oil channel 6. The pressure reducing valve return oil channel 5 is connected to the return oil. The pilot oil overflow oil channel 6 acts on the upper end of the combining valve 11. The overflow outlet oil channel 7 is connected with the overflow oil channel on the left side of the combining valve 11 and is connected to the low-pressure oil circuit. The overflow spring 10 is arranged at the lower end of the combining valve 11 to limit the overflow pressure. The main pump oil channel 8 is connected with the combining oil channel on the left side of the combining valve 11. The external control oil channel 9 is connected with the lower end of the combining valve 11. The combining valve pilot pump oil channel 12 is connected to the right of the combining valve 11. The side merging oil channels are connected. In the standby state, the hydraulic oil from the pilot pump oil channel 1 provides an oil source for the external pilot control system through the pressure reducing valve 3 and the pressure reducing valve oil outlet channel 4 and acts on the upper end of the merging valve 11 through the pilot oil overflow oil channel 6, so that the oil in the pilot pump oil channel 1 overflows through the merging valve 11, ensuring that the merging valve pilot pump oil channel 12 is not connected to the main pump oil channel 8. When the external pilot control system is working, the pressure in the main pump oil channel 8 increases. When the sum of the pressure of the external control oil channel 9 and the force of the overflow spring 10 is higher than the pressure at the upper end of the merging valve 11, the spool of the merging valve 11 begins to move upward to gradually close the overflow channel of the merging valve 11 to prevent overflow. At the same time, the main pump oil channel 8 and the merging valve pilot pump oil channel 12 are gradually connected to achieve the merging of the pilot pump and the main pump.

Claims

1. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), an overflow valve (8), an overflow valve spring (9), a main pump oil passage (10), an external control oil passage (11), a converging valve (12), a converging valve pilot pump inlet oil passage (13), a converging valve spring (14), a pilot pump inlet oil passage (1) and a pressure reducing valve inlet oil passage (2), a pilot oil overflow oil passage (6) and The pilot pump oil passage (13) of the converging valve is connected. The pressure reducing valve (3) supplies oil to the pressure reducing valve oil passage (4). The pressure reducing valve oil passage (4) provides an oil source for the external pilot control system and is connected to the upper end of the converging valve (12). The pressure reducing valve return oil passage (5) is connected to the return oil. The pilot oil overflow oil passage (6) is connected to the right side of the overflow valve (8) and its upper end. The overflow valve oil passage (7) is connected to the left side of the overflow valve (8) and is connected to the low-pressure oil circuit. The overflow valve spring (9) is arranged at the lower end of the overflow valve (8) to limit the overflow pressure. The main pump oil passage (10) is connected to the left side of the converging valve (12). The control oil passage (11) is communicated with the lower ends of the relief valve (8) and the merging valve (12), respectively. The merging valve pilot pump inlet oil passage (13) is communicated with the right side of the merging valve (12). The merging valve spring (14) is arranged at the upper end of the merging valve (12) and together with the pressure reducing valve outlet oil passage (4) determines the opening pressure of the merging valve (12). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the pilot oil relief oil passage (6) and the relief valve (8), ensuring that the merging valve pilot pump inlet oil passage (13) is not communicated with the main pump oil passage (10). When the external pilot control system is working, When the pressure of the external control oil passage (11) is greater than the sum of the pressure of the relief valve spring (9), the valve core of the relief valve (8) starts to move upward and gradually closes the relief valve (8) to overflow. When the pressure of the external control oil passage (11) is greater than the sum of the pressure of the pressure reducing valve outlet passage (4) and the force of the confluence valve spring (14), the valve core of the confluence valve (12) starts to move upward and gradually connects the main pump oil passage (10) and the confluence valve pilot pump oil passage (13), thereby achieving confluence of the pilot pump and the main pump.

2. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), an overflow valve (8), an overflow valve spring (9), a main pump oil passage (10), an external control oil passage (11), a converging valve (12), a converging valve pilot pump inlet oil passage (13), a converging valve spring (14), a pilot pump inlet oil passage (1) and a pressure reducing valve inlet oil passage ( 2) The pilot oil overflow passage (6) is connected to the pilot pump oil passage (13) of the converging valve. The pressure reducing valve (3) supplies oil to the pressure reducing valve outlet passage (4). The pressure reducing valve outlet passage (4) provides oil source for the external pilot control system. The pressure reducing valve return passage (5) is connected to the return oil. The pilot oil overflow passage (6) is connected to the right side of the relief valve (8) and its upper end. The relief valve outlet passage (7) is connected to the left side of the relief valve (8) and is connected to the low-pressure oil circuit. The relief valve spring (9) is arranged at the lower end of the relief valve (8) to limit the overflow pressure. The main pump oil passage (10) is connected to the converging valve. The left side of the flow control valve (12) is connected, the external control oil passage (11) is connected to the overflow valve (8) and the lower end of the merging valve (12), the merging valve pilot pump inlet oil passage (13) is connected to the right side of the merging valve (12), and the merging valve spring (14) is arranged at the upper end of the merging valve (12). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the pilot oil overflow oil passage (6) and the overflow valve (8), ensuring that the merging valve pilot pump inlet oil passage (13) is not connected to the main pump oil passage (10). When the external pilot control system is working, When the pressure of the external control oil passage (11) is greater than the force of the overflow valve spring (9), the pressure of the main pump oil passage (10) begins to increase. When the sum of the pressure of the external control oil passage (11) and the force of the overflow valve spring (9) is greater than the pressure of the pilot oil overflow oil passage (6), the valve core of the overflow valve (8) begins to move upward and gradually closes the overflow valve (8). When the pressure of the external control oil passage (11) is greater than the force of the confluence valve spring (14), the valve core of the confluence valve (12) begins to move upward and gradually connects the main pump oil passage (10) and the confluence valve pilot pump oil passage (13), thereby achieving confluence of the pilot pump and the main pump.

3. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), a relief valve (8), an overflow valve spring (9), a main pump oil passage (10), an external control oil passage (11), a converging valve (12), a converging valve pilot pump inlet oil passage (13), a pilot pump inlet oil passage (1) and a pressure reducing valve inlet oil passage (2) and a pilot oil overflow oil passage (6) The pressure reducing valve (3) supplies oil to the pressure reducing valve outlet passage (4), which provides an oil source for the external pilot control system and acts on the upper end of the combining valve (12). The pressure reducing valve return passage (5) is connected to the return oil. The pilot oil overflow passage (6) is connected to the right side of the overflow valve (8) and its upper end. The overflow valve outlet passage (7) is connected to the left side of the overflow valve (8) and is connected to the low-pressure oil circuit. The overflow valve spring (9) is arranged at the lower end of the overflow valve (8) to limit the overflow pressure. The main pump oil passage (10) is connected to the combining valve (12). The left side of the valve (12) is connected, the external control oil passage (11) is connected to the lower end of the relief valve (8) and the converging valve (12), respectively, and the converging valve pilot pump inlet oil passage (13) is connected to the right side of the converging valve (12). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the pilot oil overflow oil passage (6) and the relief valve (8), and the pressure of the pressure reducing valve outlet oil passage (4) determines the opening pressure of the converging valve (12), ensuring that the converging valve pilot pump inlet oil passage (13) and the main pump oil passage (10) are not connected. When the external pilot control system is working, When the pressure in the external control oil passage (11) is in operation, the pressure in the main pump oil passage (10) begins to increase. When the sum of the pressure in the external control oil passage (11) and the force of the overflow valve spring (9) is greater than the pressure in the pilot oil overflow oil passage (6), the valve core of the overflow valve (8) begins to move upward and gradually closes the overflow valve (8). When the pressure in the external control oil passage (11) is greater than the pressure in the pressure reducing valve outlet passage (4), the valve core of the merging valve (12) begins to move upward and gradually connects the main pump oil passage (10) and the merging valve pilot pump oil passage (13), thereby achieving the merging of the pilot pump and the main pump.

4. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve oil inlet passage (2), a pressure reducing valve (3), a pressure reducing valve oil outlet passage (4), a pressure reducing valve oil return passage (5), a pilot oil overflow passage (6), an overflow valve oil outlet passage (7), an overflow valve (8), an overflow valve spring (9), a main pump oil passage (10), an external control oil passage (11), a converging valve (12), and a converging valve pilot pump inlet oil passage (13). The pilot pump inlet oil passage (1) is connected to the pressure reducing valve oil inlet passage (2) and the converging valve pilot pump inlet oil passage (13). The pressure reducing valve (3) supplies oil to the pressure reducing valve outlet passage (4), the pressure reducing valve outlet passage (4) provides an oil source for the external pilot control system and communicates with the pilot oil overflow passage (6) and the upper end of the merging valve (12), the pressure reducing valve return passage (5) is connected to the return oil, the pilot oil overflow passage (6) communicates with the right side of the relief valve (8) and its upper end, the relief valve outlet passage (7) communicates with the left side of the relief valve (8) and is connected to the low-pressure oil circuit, the relief valve spring (9) is arranged at the lower end of the relief valve (8) to limit the relief pressure, the main pump oil passage (10) communicates with the left side of the merging valve (12), The external control oil passage (11) is communicated with the lower ends of the relief valve (8) and the converging valve (12), respectively. The converging valve pilot pump inlet oil passage (13) is communicated with the right side of the converging valve (12). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the relief valve (8) via the pressure reducing valve (3), the pressure reducing valve outlet oil passage (4) and the pilot oil relief oil passage (6). At the same time, the hydraulic oil output from the pressure reducing valve outlet oil passage (4) acts on the upper end of the converging valve (12), ensuring that the converging valve pilot pump inlet oil passage (13) is not communicated with the main pump oil passage (10). When the external pilot pump is in the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the relief valve (8). When the pilot control system is working, the pressure of the main pump oil passage (10) begins to increase. When the sum of the pressure of the external control oil passage (11) and the force of the overflow valve spring (9) is higher than the pressure of the pilot oil overflow passage (6), the valve core of the overflow valve (8) begins to move upward and gradually closes the overflow valve (8). When the pressure of the external control oil passage (11) is higher than the pressure of the pressure reducing valve outlet passage (4), the valve core of the merging valve (12) begins to move upward and gradually connects the main pump oil passage (10) and the merging valve pilot pump oil passage (13), thereby achieving the merging of the pilot pump and the main pump.

5. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump merging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), a main pump oil passage (8), an external control oil passage (9), an overflow spring (10), a merging valve (11), and a merging valve pilot pump inlet oil passage (12). The merging valve (11) has two functions, namely, overflow and merging. The pilot pump inlet oil passage (1) and the pressure reducing valve inlet oil passage are connected to each other. (2) is connected to the oil channel (12) of the pilot pump of the merging valve, the pressure reducing valve (3) supplies oil to the pressure reducing valve outlet channel (4), the pressure reducing valve outlet channel (4) provides oil source for the external pilot control system and is connected to the pilot oil overflow channel (6) and the upper end of the merging valve (11), the pressure reducing valve return channel (5) is connected to the return oil, the pilot oil overflow channel (6) is connected to the overflow channel on the right side of the merging valve (11), the overflow outlet channel (7) is connected to the overflow channel on the left side of the merging valve (11) and is connected to the low-pressure oil circuit, and the overflow spring (10) is arranged on the merging valve ( The lower end of the main pump oil passage (8) is connected to the left side of the merging valve (11), the external control oil passage (9) is connected to the lower end of the merging valve (11), and the merging valve pilot pump inlet oil passage (12) is connected to the right side of the merging valve (11). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) overflows through the pressure reducing valve (3) and the pressure reducing valve outlet passage (4) through the pilot oil overflow passage (6) and the merging valve (11) and acts on the upper end of the merging valve (11), ensuring that the pilot oil of the merging valve is The pump inlet oil passage (12) is not connected to the main pump oil passage (8). When the external pilot control system is working, the pressure of the main pump oil passage (8) increases. When the sum of the pressure of the external control oil passage (9) and the force of the overflow spring (10) is higher than the pressure at the upper end of the merging valve (11), the valve core of the merging valve (11) is pushed upward to gradually close the pilot oil overflow oil passage (6) and the overflow outlet oil passage (7) to prevent overflow. At the same time, the main pump oil passage (8) and the merging valve pilot pump inlet oil passage (12) are gradually connected to achieve merging of the pilot pump and the main pump.

6. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump merging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), a main pump oil passage (8), an external control oil passage (9), an overflow spring (10), a merging valve (11), and a merging valve pilot pump inlet oil passage (12). The merging valve (11) has two functions, namely, overflow and merging. The pilot pump inlet oil passage (1) is connected to the pressure reducing valve inlet oil passage (2) and The pilot pump inlet oil passage (12) of the merging valve is communicated with the pilot pump inlet oil passage (12), the pressure reducing valve (3) supplies oil to the pressure reducing valve outlet oil passage (4), the pressure reducing valve outlet oil passage (4) provides an oil source for the external pilot control system, the pressure reducing valve return oil passage (5) is connected to the return oil, the pilot oil overflow oil passage (6) is communicated with the overflow oil passage on the right side of the merging valve (11) and the pilot pump inlet oil passage (1) and acts on the upper end of the merging valve (11), the overflow outlet oil passage (7) is communicated with the overflow oil passage on the left side of the merging valve (11) and is connected to the low-pressure oil circuit, and the overflow spring (10) is arranged at the lower end of the merging valve (11) to limit the overflow. The main pump oil passage (8) is connected to the left side of the merging valve (11), the external control oil passage (9) is connected to the lower end of the merging valve (11), and the merging valve pilot pump inlet oil passage (12) is connected to the right side of the merging valve (11). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) provides an oil source for the external pilot control system through the pressure reducing valve (3) and the pressure reducing valve outlet oil passage (4), overflows through the pilot oil overflow passage (6) and the merging valve (11) and acts on the upper end of the merging valve (11), ensuring that the merging valve The pilot pump inlet oil passage (12) is not connected to the main pump oil passage (8). When the external pilot control system is working, the pressure of the main pump oil passage (8) increases. When the sum of the pressure of the external control oil passage (9) and the force of the overflow spring (10) is higher than the pressure at the upper end of the merging valve (11), the spool of the merging valve (11) begins to move upward, gradually closing the pilot oil overflow passage (6) and the overflow outlet passage (7) to prevent overflow. At the same time, the main pump oil passage (8) and the merging valve pilot pump inlet oil passage (12) are gradually connected, thereby achieving merging of the pilot pump and the main pump.

7. An excavator external control pilot pump confluence oil source valve, Features: The excavator externally controlled pilot pump converging oil source valve comprises a pilot pump inlet oil passage (1), a pressure reducing valve inlet oil passage (2), a pressure reducing valve (3), a pressure reducing valve outlet oil passage (4), a pressure reducing valve return oil passage (5), a pilot oil overflow oil passage (6), an overflow valve outlet oil passage (7), a main pump oil passage (8), an external control oil passage (9), an overflow spring (10), a converging valve (11), and a converging valve pilot pump inlet oil passage (12). The converging valve (11) has two functions, namely, overflow and converging. The pilot pump inlet oil passage (1) is connected to the right and left ends of the converging valve (11). The side overflow oil passage pressure reducing valve oil inlet passage (2) is connected to the converging valve pilot pump oil passage (12), the pressure reducing valve (3) supplies oil to the pressure reducing valve oil outlet passage (4), the pressure reducing valve oil outlet passage (4) provides oil source for the external pilot control system and is connected to the pilot oil overflow oil passage (6), the pressure reducing valve return oil passage (5) is connected to the return oil, the pilot oil overflow oil passage (6) acts on the upper end of the converging valve (11), the overflow oil outlet passage (7) is connected to the overflow oil passage on the left side of the converging valve (11) and is connected to the low-pressure oil circuit, and the overflow spring (10) is arranged at the lower end of the converging valve (11) to limit the overflow. The main pump oil passage (8) is connected to the left side of the merging valve (11), the external control oil passage (9) is connected to the lower end of the merging valve (11), and the merging valve pilot pump inlet oil passage (12) is connected to the right side of the merging valve (11). In the standby state, the hydraulic oil from the pilot pump inlet oil passage (1) provides an oil source for the external pilot control system through the pressure reducing valve (3) and the pressure reducing valve outlet oil passage (4) and acts on the upper end of the merging valve (11) through the pilot oil overflow oil passage (6), so that the oil from the pilot pump inlet oil passage (1) passes through the merging valve. (11) overflows to ensure that the pilot pump oil passage (12) of the merging valve is not connected to the main pump oil passage (8). When the external pilot control system is working, the pressure of the main pump oil passage (8) increases. When the sum of the pressure of the external control oil passage (9) and the force of the overflow spring (10) is higher than the pressure at the upper end of the merging valve (11), the spool of the merging valve (11) begins to move upward to gradually close the overflow passage of the merging valve (11) to prevent overflow. At the same time, the main pump oil passage (8) and the pilot pump oil passage (12) of the merging valve are gradually connected to achieve merging of the pilot pump and the main pump.

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