Excavator hydraulic pump with pressure relief structure

Abstract

The utility model discloses an excavator hydraulic pump with a pressure relief structure, and relates to the technical field of excavator hydraulic pumps, the excavator hydraulic pump with the pressure relief structure comprises a cylinder body mechanism, the main body of the cylinder body mechanism is of a hollow structure, and the right side of the cylinder body mechanism is fixedly connected with the pressure relief mechanism. According to the buffer type pressure relief oil supply device, buffer storage and rapid backflow supplement of pressure relief oil are achieved through cooperation of the buffer storage connecting pipe, the buffer storage mechanism, the guide assembly, the guide rod assembly, the floating ball assembly, the blocking ball assembly, the supply pipe and the supply pump, and when the oil flows into the buffer storage mechanism through pressure relief, the buffer storage mechanism is connected with the cylinder body mechanism, and the pressure relief mechanism is connected with the cylinder body mechanism. The floating ball assembly drives the blocking ball assembly to close the discharging opening along with rising of the liquid level, and oil liquid is prevented from overflowing. When the oil liquid needs to be supplemented, the supply pump sends the cached oil liquid back to the liquid inlet pipe through the supply pipe, and the oil liquid supplementing speed is increased.

Description

Technical Field

[0001] This utility model relates to the field of excavator hydraulic pump technology, specifically an excavator hydraulic pump with a pressure relief structure. Background Technology

[0002] Excavators are commonly used mechanical equipment in engineering construction. As the core component of the excavator's hydraulic system, the stability of the hydraulic pump's performance directly affects the excavator's normal operation. An existing patent, CN201610563U, describes an excavator and its hydraulic pump, which includes a main pump and a pilot pump. The main pump has a power input shaft, and the pilot pump is located radially to the power input shaft and within the axial length of the main pump. This invention reduces the overall axial length of the hydraulic pump, effectively saving space and providing necessary space for the design and layout of medium and large excavators.

[0003] Regarding the aforementioned technologies, the inventors believe that the following defects exist: Existing excavator hydraulic pumps, due to the lack of an effective pressure relief and buffer structure, result in slow replenishment speeds when a large amount of pressure is released during use, which is a limitation. Therefore, we propose an excavator hydraulic pump with a pressure relief structure to solve the above-mentioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an excavator hydraulic pump with a pressure relief structure. This solves the problem that existing excavator hydraulic pumps, due to the lack of an effective pressure relief and buffer structure, have a slow replenishment speed when a large amount of pressure is released and replenishment is needed, thus limiting their operation.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an excavator hydraulic pump with a pressure relief structure, including a cylinder mechanism, the main body of which is a hollow internal structure, and a pressure relief mechanism is fixedly connected to the right side of the cylinder mechanism. The pressure relief mechanism is a pipe structure and communicates with the cylinder mechanism.

[0006] The pressure relief mechanism is fixedly connected to a pressure relief pipe on the side away from the cylinder body mechanism, and an overflow pipe is fixedly connected to the side of the pressure relief pipe away from the pressure relief mechanism. The overflow pipe is inclined, and an overflow flange is fixedly connected to the far end of the overflow pipe.

[0007] Preferably, the cylinder mechanism has an internal cavity, and a piston assembly is slidably connected inside the internal cavity. An output assembly is fixedly connected to the top surface of the piston assembly, and the output assembly is a cylindrical structure.

[0008] Preferably, an inlet pipe is fixedly connected to the left side of the outer peripheral surface of the cylinder mechanism. The inlet pipe communicates with the cylinder mechanism, and an inlet valve is fixedly connected to the outside of the inlet pipe. An inlet flange is fixedly connected to the side of the inlet pipe away from the cylinder mechanism.

[0009] Preferably, a buffer pipe is fixedly connected to the bottom of the outer peripheral surface of the pressure relief pipe, and a buffer mechanism is fixedly connected to the bottom surface of the buffer pipe. The main body of the buffer mechanism is a hollow tank structure, and a guide component is fixedly connected to the inner side of the buffer mechanism.

[0010] Preferably, the guide component is arranged horizontally, and a guide rod component is inserted into the inner side of the guide component, the main body of the guide rod component being a cylindrical structure.

[0011] Preferably, a float assembly is fixedly connected to the bottom end face of the guide rod assembly, the float assembly having an internal hollow structure, and a ball-blocking assembly is also fixedly connected to the top end face of the guide rod assembly.

[0012] Preferably, the ball-blocking assembly is used to seal the feed of the buffer pipe, and a supply pipe is fixedly connected to the rear side of the outer peripheral surface of the buffer mechanism. The supply pipe is connected to the liquid inlet pipe and is used for the return of oil. A supply pump is fixedly connected to the outside of the supply pipe.

[0013] Beneficial effects

[0014] This invention provides an excavator hydraulic pump with a pressure relief structure. Compared with the prior art, it has the following advantages:

[0015] This excavator hydraulic pump with a pressure relief structure, by setting a pressure relief mechanism that is connected to the cylinder mechanism, allows the oil to be quickly discharged through the pressure relief pipe and overflow pipe when the internal pressure of the hydraulic pump is too high, thereby reducing the internal pressure in time and avoiding damage to the hydraulic pump components due to excessive pressure. This solves the problem of the lack of an effective pressure relief structure in the existing technology.

[0016] This excavator hydraulic pump with a pressure relief structure achieves buffering and rapid return replenishment of the depressurized oil through the cooperation of a buffer pipe, buffer mechanism, guide assembly, guide rod assembly, float assembly, ball blocking assembly, supply pipe, and supply pump. When the depressurized oil flows into the buffer mechanism, the float assembly rises with the liquid level, causing the ball blocking assembly to close the discharge port and prevent oil overflow. When oil needs to be replenished, the supply pump sends the buffered oil back to the inlet pipe through the supply pipe, which speeds up the oil replenishment and solves the problem of slow oil replenishment after depressurization in the prior art, thus improving the working efficiency and stability of the hydraulic pump. Attached Figure Description

[0017] Figure 1 This is a cross-sectional front view of the hydraulic pump for excavators according to this utility model.

[0018] Figure 2 This is a schematic diagram of the shaft side view of the hydraulic pump for excavators according to this utility model;

[0019] Figure 3 This is a top view of the hydraulic pump for excavators according to this utility model.

[0020] Figure 4 This is a schematic diagram of the left-side structure of the hydraulic pump for excavators according to this utility model;

[0021] Figure 5 This is a front view schematic diagram of the hydraulic pump for excavators according to this utility model;

[0022] Figure 6 This is a schematic diagram of the buffer mechanism of the hydraulic pump for excavators according to this utility model.

[0023] In the diagram: 1. Cylinder body mechanism; 101. Piston assembly; 1011. Output assembly; 1012. Inlet pipe; 1013. Inlet valve; 1014. Inlet flange; 2. Pressure relief mechanism; 201. Pressure relief valve; 2011. Pressure relief pipe; 2012. Overflow pipe; 2013. Overflow flange; 3. Buffer mechanism; 301. Buffer connection pipe; 3011. Guide assembly; 3012. Guide rod assembly; 3013. Float assembly; 3014. Ball blocking assembly; 3015. Supply pipe; 3016. Supply pump. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-6 This utility model provides a technical solution: an excavator hydraulic pump with a pressure relief structure, including a cylinder body mechanism 1. The main body of the cylinder body mechanism 1 is a hollow internal structure, and a pressure relief mechanism 2 is fixedly connected to the right side of the cylinder body mechanism 1. The pressure relief mechanism 2 is a pipe structure and is in communication with the cylinder body mechanism 1.

[0026] A pressure relief pipe 2011 is fixedly connected to the side of the pressure relief mechanism 2 away from the cylinder mechanism 1. An overflow pipe 2012 is fixedly connected to the side of the pressure relief pipe 2011 away from the pressure relief mechanism 2. The overflow pipe 2012 is inclined and an overflow flange 2013 is fixedly connected to the far end of the overflow pipe 2012.

[0027] Through the through connection between cylinder mechanism 1 and pressure relief mechanism 2, when the internal pressure of the hydraulic pump is too high, the oil can be discharged through pressure relief mechanism 2 to relieve pressure and ensure the safety of the hydraulic pump.

[0028] See Figures 1-3 The cylinder mechanism 1 has an internal cavity, and a piston assembly 101 is slidably connected inside the internal cavity. An output assembly 1011 is fixedly connected to the top surface of the piston assembly 101. The output assembly 1011 has a cylindrical structure.

[0029] The piston assembly 101 inside the cylinder mechanism 1 slides up and down, driving the output assembly 1011 at the top to work, realizing the conversion of hydraulic energy into mechanical energy, and providing power output for the excavator.

[0030] See Figures 2-5 A liquid inlet pipe 1012 is fixedly connected to the left side of the outer peripheral surface of the cylinder body mechanism 1. The liquid inlet pipe 1012 is connected to the cylinder body mechanism 1, and a liquid inlet valve 1013 is fixedly connected to the outside of the liquid inlet pipe 1012. A liquid inlet flange 1014 is fixedly connected to the side of the liquid inlet pipe 1012 away from the cylinder body mechanism 1.

[0031] The hydraulic oil is connected to an external pipeline through the inlet pipe 1012 on the outer circumference of the cylinder mechanism 1 via the inlet flange 1014. The inlet valve 1013 controls the flow of hydraulic oil into the cylinder mechanism 1, ensuring the stability and controllability of the inlet.

[0032] See Figures 1-2 The bottom of the outer periphery of the pressure relief pipe 2011 is fixedly connected to a buffer pipe 301, and a buffer mechanism 3 is fixedly connected to the bottom surface of the buffer pipe 301. The main body of the buffer mechanism 3 is a hollow tank structure, and a guide component 3011 is fixedly connected to the inner side of the buffer mechanism 3.

[0033] The buffering mechanism 3 is connected to the buffer pipe 301 at the bottom of the pressure relief pipe 2011. The buffering mechanism 3 buffers the oil after pressure relief, preparing for subsequent oil replenishment and improving the oil replenishment speed.

[0034] See Figures 3-4 The guide component 3011 is arranged horizontally, and the guide rod component 3012 is inserted into the inner side of the guide component 3011. The main body of the guide rod component 3012 is a cylindrical structure.

[0035] The guide component 3011 inside the buffer mechanism 3 is arranged horizontally, which guides the guide rod assembly 3012 inserted inside it, making the movement of the guide rod assembly 3012 more stable.

[0036] See Figures 5-6A float assembly 3013 is fixedly connected to the bottom end face of the guide rod assembly 3012. The float assembly 3013 has an internal hollow structure, and a ball blocking assembly 3014 is also fixedly connected to the top end face of the guide rod assembly 3012.

[0037] The float assembly 3013 at the bottom of the guide rod assembly 3012 rises and falls with the oil level in the buffer mechanism 3, driving the ball-blocking assembly 3014 at the top to move, thereby achieving the control of the opening or closing of the buffer pipe 301 for material feeding.

[0038] See Figures 1-2 The ball-blocking assembly 3014 is used to seal the feed of the buffer pipe 301, and the feed pipe 3015 is fixedly connected to the rear side of the outer peripheral surface of the buffer mechanism 3. The feed pipe 3015 is connected to the liquid inlet pipe 1012 and is used to return the oil. The feed pump 3016 is fixedly connected to the outside of the feed pipe 3015.

[0039] The supply pipe 3015 on the outer periphery of the buffer mechanism 3 is connected to the inlet pipe 1012. The supply pump 3016 sends the oil in the buffer mechanism 3 back to the inlet pipe 1012 through the supply pipe 3015, realizing oil return and accelerating the replenishment speed.

[0040] During operation, when the excavator's hydraulic pump starts, external hydraulic oil flows into the inlet pipe 1012 through the pipe connected to the inlet flange 1014. The inlet valve 1013 is in the open state, controlling the hydraulic oil to enter the inner cavity of the cylinder mechanism 1 at a stable flow rate. The piston assembly 101 inside the cylinder mechanism 1 moves up and down reciprocally under the action of hydraulic oil pressure. The output assembly 1011 at its top moves synchronously, converting hydraulic energy into mechanical energy, which is transmitted to the excavator's actuators through the output assembly 1011, driving the excavator to complete digging, lifting and other actions.

[0041] When the hydraulic system experiences a sudden increase in internal pressure due to load changes or pipeline blockage, the high-pressure oil pushes the pressure relief valve 201 in the pressure relief mechanism 2 to open, or flows directly through the pipe structure of the pressure relief mechanism 2 and the through channel of the cylinder mechanism 1 to the overflow pipe 2011. Since the overflow pipe 2012 is inclined, the oil is discharged along its inner wall to the overflow flange 2013 at the far end, achieving initial pressure relief and preventing the hydraulic pump from damaging the seals or bursting due to overpressure.

[0042] During the depressurization process, some oil flows into the buffer mechanism 3 from the buffer pipe 301 at the bottom of the depressurization pipe 2011. As the oil continues to flow in, the liquid level in the buffer mechanism 3 gradually rises. Due to buoyancy, the float assembly 3013 drives the guide rod assembly 3012 to slide upward along the transverse guide groove of the guide assembly 3011. The ball-blocking assembly 3014 at the top of the guide rod assembly 3012 moves upward synchronously and gradually fits the discharge port of the buffer pipe 301 until it is completely sealed, preventing the oil from overflowing to the outside of the buffer mechanism 3.

[0043] When the hydraulic system pressure returns to normal and oil needs to be replenished, the supply pump 3016 is energized and starts. The suction force generated by the pump causes the oil in the buffer mechanism 3 to flow into the inlet pipe 1012 through the supply pipe 3015, realizing oil return. As the liquid level in the buffer mechanism 3 drops, the buoyancy of the float assembly 3013 decreases. The guide rod assembly 3012 and the ball-blocking assembly 3014 slide downward along the guide assembly 3011 under their own gravity. The ball-blocking assembly 3014 separates from the discharge port of the buffer pipe 301, reserving a channel for the inflow of oil for the next pressure relief, forming a "pressure relief-buffering-oil replenishment" cycle working mechanism.

[0044] In summary, this device, by incorporating a buffer mechanism 3, can effectively buffer the oil after pressure relief.

[0045] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. An excavator hydraulic pump with a pressure relief structure, comprising a cylinder block mechanism (1), characterized in that: The main body of the cylinder mechanism (1) is a hollow structure, and a pressure relief mechanism (2) is fixedly connected to the right side of the cylinder mechanism (1). The pressure relief mechanism (2) is a tube structure and is connected to the cylinder mechanism (1). The pressure relief mechanism (2) is fixedly connected to a pressure relief pipe (2011) on the side away from the cylinder mechanism (1), and an overflow pipe (2012) is fixedly connected to the side of the pressure relief pipe (2011) away from the pressure relief mechanism (2). The overflow pipe (2012) is inclined, and an overflow flange (2013) is fixedly connected to the far end of the overflow pipe (2012).

2. The excavator hydraulic pump with a pressure relief structure according to claim 1, characterized in that: The cylinder mechanism (1) has an internal cavity, and a piston assembly (101) is slidably connected inside the cavity. An output assembly (1011) is fixedly connected to the top surface of the piston assembly (101), and the output assembly (1011) is a cylindrical structure.

3. The excavator hydraulic pump with a pressure relief structure according to claim 1, characterized in that: A liquid inlet pipe (1012) is fixedly connected to the left side of the outer peripheral surface of the cylinder mechanism (1). The liquid inlet pipe (1012) is connected to the cylinder mechanism (1), and a liquid inlet valve (1013) is fixedly connected to the outside of the liquid inlet pipe (1012). A liquid inlet flange (1014) is fixedly connected to the side of the liquid inlet pipe (1012) away from the cylinder mechanism (1).

4. The excavator hydraulic pump with a pressure relief structure according to claim 1, characterized in that: The pressure relief pipe (2011) is fixedly connected to the bottom of its outer peripheral surface with a buffer pipe (301), and a buffer mechanism (3) is fixedly connected to the bottom surface of the buffer pipe (301). The main body of the buffer mechanism (3) is a hollow tank structure, and a guide component (3011) is fixedly connected to the inner side of the buffer mechanism (3).

5. The excavator hydraulic pump with a pressure relief structure according to claim 4, characterized in that: The guide component (3011) is arranged horizontally, and a guide rod component (3012) is inserted into the inner side of the guide component (3011). The main body of the guide rod component (3012) is a cylindrical structure.

6. The excavator hydraulic pump with a pressure relief structure according to claim 5, characterized in that: A float assembly (3013) is fixedly connected to the bottom end face of the guide rod assembly (3012). The float assembly (3013) has an internal hollow structure, and a ball blocking assembly (3014) is also fixedly connected to the top end face of the guide rod assembly (3012).

7. The excavator hydraulic pump with a pressure relief structure according to claim 6, characterized in that: The ball-blocking assembly (3014) is used to seal the feed of the buffer pipe (301), and a supply pipe (3015) is fixedly connected to the rear side of the outer peripheral surface of the buffer mechanism (3). The supply pipe (3015) is connected to the liquid inlet pipe (1012) and is used to return the oil. A supply pump (3016) is fixedly connected to the outside of the supply pipe (3015).

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