An oil return valve body for an excavator hydraulic metering pump

Abstract

The present invention relates to the field of engineering machinery technology, specifically to an excavator hydraulic metering pump return oil valve body, comprising an oil return valve body, a first mounting flange being provided at the top of the oil return valve body, a second mounting flange being provided at the top of the first mounting flange, a valve cover being provided at the top of the second mounting flange, a right connecting plate being provided on the right side surface of the oil return valve body, and a left connecting plate being provided on the left side surface of the oil return valve body. The telescopic cylinder of the present invention drives the stabilizing ring and the stabilizing plate to rise, and the telescopic rod pushes the sealing plate to the surface of the mounting ring, thereby sealing the oil inlet, and also sealing the oil inlet hole to a certain extent, thereby sealing the oil inlet, and the remaining oil inside the oil return valve body will directly flow to the inside of the oil tank through the circuit port, thereby reducing the pressure inside the oil return valve body, thereby enabling rapid pressure relief, solving the problem of slow pressure relief speed in the past.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to an oil return valve body of a hydraulic metering pump of an excavator. Background Art

[0002] The hydraulic system of an excavator is a combination of various hydraulic components organically connected by pipelines in accordance with the transmission requirements of the excavator's working device and various mechanisms.

[0003] In this regard, Chinese patent application number CN202011122320.6 discloses a method for measuring oil return valve flow rate, comprising the following steps: Step S1: Compressed gas is introduced into the inlet port of a rotameter, and the gas storage port of the rotameter is connected to the inlet port of the oil return valve, thereby establishing a flow path; Step S2: Controlling the oil return valve to switch from an open state to a closed state. If the float in the rotameter does not reach the bottom, this indicates a poor valve seal; Step S3: Eliminate any inherent valve seal problems, adjust the system to a sealed state, and control the oil return valve to switch from a closed state to an open state. Oil return valves tested using this measurement system effectively meet the engine's fuel control requirements. This system offers high measurement accuracy, a clean operating environment, low noise, and easy operation. The size of the oil return hole determines the flow rate of the flow-through meter, which in turn determines the aperture size. This facilitates control of the machining aperture and also ensures control of the valve's sealing properties.

[0004] During use, the rotor flowmeter can measure the amount of return oil to a certain extent, and the measurement accuracy is high. However, in actual use, after the oil pressure increases, the spring pushes upward, so that the diesel engine oil will flow back to the fuel tank from the return oil outlet. However, the reflux efficiency is not high during the reflux process. The spring will only drop when the oil pressure in the pipeline decreases, so that the valve is closed. The waiting time is long, and the diesel engine oil has certain blockage and efficiency problems in long-term use. Therefore, it is urgent to improve and perfect the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an oil return valve body for a hydraulic metering pump of an excavator, so as to solve the problem raised in the above-mentioned background technology that during actual use, after the oil pressure increases, the spring pushes upward, so that the diesel engine oil will flow back to the oil tank from the oil return outlet, but the reflux efficiency is not high during the reflux process. The spring will only drop when the oil pressure in the pipeline decreases, so that the valve is closed, the waiting time is long, and the diesel engine oil will have certain blockage and efficiency problems in long-term use.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an oil return valve body of a hydraulic metering pump for an excavator, comprising an oil return valve body, a first mounting flange being provided at the top of the oil return valve body, a second mounting flange being provided at the top of the first mounting flange, a valve cover being provided at the top of the second mounting flange, a right connecting disc being provided on the right side surface of the oil return valve body, a left connecting disc being provided on the left side surface of the oil return valve body, an oil return pipe being provided inside the left connecting disc, a connecting piece being provided on the bottom end surface of the second mounting flange, an adjusting screw being provided inside the valve cover, a valve body being provided at the bottom end of the adjusting screw, a spring net being provided on the surface of the valve body, a gasket being provided at the bottom end of the valve body, and a rotor flowmeter body being provided at the bottom end of the valve body;

[0007] Groove, a groove is provided inside the return oil valve body, and the groove and the valve body are adapted to each other, an oil inlet is provided inside the right connecting disk, an oil inlet cylinder is provided inside the oil inlet, and a return port is provided inside the left connecting disk, and the bottom end of the valve body is fixedly connected with a telescopic cylinder, a telescopic spring is provided inside the telescopic cylinder, and the telescopic cylinder moves with the movement of the valve body, a stabilizing ring is provided on the surface of the telescopic cylinder, a stabilizing plate is fixedly connected to the right surface of the stabilizing ring, and the bottom end of the stabilizing plate is fixedly connected to the first rack plate.

[0008] Preferably, the surface of the first rack plate is meshedly connected with a first gear, movable shafts are provided on both sides of the surface of the first gear, and a stabilizing shell is provided on the surface of the movable shaft.

[0009] Preferably, a connecting plate is fixedly connected to the back of the stabilizing shell, and the connecting plate is installed on the inner wall of the return oil valve body. The bottom end surface of the first gear is meshed and connected with the second rack plate. A sliding groove is provided on one side of the surface of the first gear, and the sliding groove and the second rack plate are adapted to each other.

[0010] Preferably, the right side surface of the second rack plate is fixedly connected to a telescopic rod, the bottom end surface of the second rack plate is provided with a bottom plate, the bottom end of the bottom plate is fixedly connected to a third rack plate, and the end of the telescopic rod away from the second rack plate is fixedly connected to a sealing plate.

[0011] Preferably, a mounting ring is fixedly connected to the inner side wall of the oil inlet, and the mounting ring and the sealing plate are adapted to each other.

[0012] Preferably, an oil inlet hole is formed on the inner bottom wall of the oil inlet cylinder, a first through-tube is provided inside the oil inlet hole, and the first through-tube and the oil inlet hole are adapted to each other.

[0013] Preferably, a second through pipe and a third through pipe are sequentially provided on the left side surface of the first through pipe from top to bottom, and a delivery pipe is installed between the second through pipe and the third through pipe.

[0014] Preferably, a turbine blade is provided inside the first through tube, a rotating shaft is provided on the right side surface of the turbine blade, a rotating column is provided on the right side of the rotating shaft, the rotating column is installed on the inner wall of the first through tube, the left side surface of the turbine blade is fixedly connected to the first movable column, the first movable column is installed by inserting the inner wall of the first through tube, the end of the first movable column away from the turbine blade is fixedly connected to the first bevel gear, the surface of the first bevel gear is meshed with the second bevel gear, the surface of the second bevel gear is fixedly connected to the second movable column, and the top of the second movable column is provided with a second gear.

[0015] Preferably, the second gear and the third rack plate are adapted to each other, and the third rack plate and the second gear are meshed and connected to each other.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The excavator hydraulic metering pump oil return valve body, through the set oil inlet cylinder), oil inlet cylinder, telescopic cylinder, circuit port, oil inlet, stabilizing ring, stabilizing plate, first rack plate, first gear, stabilizing shell, connecting plate, second rack plate, bottom plate, telescopic rod and rotor flowmeter body. When in use, the return oil amount inside the return valve body is first measured by the rotor flowmeter body, and accurate data is obtained after the measurement. Then the oil enters the inside of the return valve body from the inside of the oil inlet cylinder. When the oil pressure inside the return valve body increases, the valve body is lifted up, and then the circuit port is opened, so that the oil flows back to the oil tank from the inside of the circuit port. Before flowing back to the oil tank, when the valve body rises, the telescopic cylinder is driven to rise through the valve body, so that the telescopic cylinder will drive the stabilizing ring and the stabilizing plate to rise, which can bring The first rack plate is driven to rotate on the surface of the first gear, thereby driving the first gear to rotate, and the first gear drives the second rack plate to move forward, so that the second rack plate drives the telescopic rod to move forward, and the telescopic rod pushes the sealing plate to the surface of the mounting ring, thereby sealing the oil inlet and the oil inlet hole to a certain extent, so that the oil inlet is sealed, and the remaining oil in the oil return valve body will directly flow to the inside of the oil tank through the return port, so that the pressure inside the oil return valve body is reduced, so that the pressure can be quickly relieved, which solves the problem of slow pressure relief speed in the past, and after the pressure is relieved, the sealing plate returns to its original position, and oil can be quickly supplied through the oil inlet cylinder and the oil inlet hole to ensure the oil supply effect of the device, and then oil is supplied through the first through pipe, the second through pipe and the third through pipe at the same time, which reflects the functionality of the design.

[0018] 2. The oil return valve body of the hydraulic metering pump of the excavator is provided with a bottom plate, a third rack plate, a first through pipe, a second through pipe, a third through pipe, a turbine blade, a rotating shaft, a rotating column, a first movable column, a first bevel gear, a second bevel gear, a second movable column and a second gear. When in use, when the second rack plate starts to move to the right, the second rack plate can drive the bottom plate and the third rack plate to move to the right as a whole, and then after the sealing plate is pressed against the inside of the mounting ring, the second rack plate stops moving, and then when the second rack plate moves to the left, the third rack plate will also move at the same time, so that when the first rack plate starts to move to the right, the second rack plate can be driven to move to the right as a whole. After the three-rack plate contacts the surface of the second gear, the second gear starts to rotate, so that the second gear drives the second movable column to rotate, and the second movable column and the second bevel gear drive the first bevel gear to rotate, so that the first bevel gear can drive the first movable column to rotate. When the first movable column rotates, oil starts to flow into the inside of the first through-tube at the same time. Before the oil flows in, the turbine blades rotate inside the first through-tube, so that the turbine blades rotate faster under the gravity of the oil, so that the oil can be transported quickly, and the inside of the first through-tube can be prevented from being blocked, solving the problem of slow efficiency during transportation during blocking in the past. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of the structure of the present invention;

[0021] Figure 3 It is a three-dimensional schematic diagram of the oil inlet cylinder and the first through-tube structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the disassembly of the telescopic cylinder and the sealing plate structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the disassembly of the first through-tube and turbine blade structure of the present invention;

[0024] Figure 6 For the present invention Figure 1 Schematic diagram of the structure's disassembly;

[0025] Figure 7 For the present invention Figure 2 A magnified schematic diagram of the structure at center A.

[0026] Figure: 1, oil return valve body; 2, first mounting flange; 3, second mounting flange; 4, valve cover; 5, right connecting plate; 6, left connecting plate; 7, connecting piece; 8, adjusting screw; 9, spring net; 10, valve body; 11, gasket; 12, rotor flowmeter body; 13, groove; 15, oil inlet cylinder; 16, telescopic cylinder; 17, return port; 18, oil inlet; 19, stabilizing ring; 20, stabilizing plate; 21, first rack plate; 22, first gear; 23, Stabilizing shell; 24. Connecting plate; 25. Second rack plate; 26. Bottom plate; 27. Telescopic rod; 28. Sealing plate; 29. ​​Mounting ring; 30. Third rack plate; 31. First through-tube; 32. Second through-tube; 33. Third through-tube; 34. Turbine blade; 35. Rotating shaft; 36. Rotating column; 37. First movable column; 38. First bevel gear; 39. Second bevel gear; 40. Second movable column; 41. Second gear; 42. Oil inlet hole; 43. Oil return pipe. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-7 , an embodiment provided by the present invention:

[0029] A return oil valve body for a hydraulic metering pump of an excavator. The return oil valve body 1, rotor flowmeter body 12, telescopic cylinder 16 and telescopic rod 27 used in this application are all products that can be directly purchased on the market. Their principles and connection methods are all existing technologies well known to those skilled in the art, so they will not be described in detail here. It includes an oil return valve body 1, a first mounting flange 2 is provided at the top of the return oil valve body 1, a second mounting flange 3 is provided at the top of the first mounting flange 2, a valve cover 4 is provided at the top of the second mounting flange 3, a right connecting plate 5 is provided on the right side surface of the return oil valve body 1, a left connecting plate 6 is provided on the left side surface of the return oil valve body 1, an oil return pipe 43 is provided inside the left connecting plate 6, a connecting piece 7 is provided on the bottom end surface of the second mounting flange 3, an adjusting screw 8 is provided inside the valve cover 4, a valve body 10 is provided at the bottom end of the adjusting screw 8, a spring net 9 is provided on the surface of the valve body 10, a gasket 11 is provided at the bottom end of the valve body 10, and a rotor flowmeter body 12 is provided at the bottom end of the valve body 10;

[0030] Groove 13, the interior of the oil return valve body 1 is provided with a groove 13, the groove 13 and the valve body 10 are adapted to each other, the interior of the right connecting plate 5 is provided with an oil inlet 18, the inner side wall of the oil inlet 18 is fixedly connected with a mounting ring 29, the mounting ring 29 and the sealing plate 28 are adapted to each other, the interior of the oil inlet 18 is provided with an oil inlet cylinder 15, the inner bottom wall of the oil inlet cylinder 15 is provided with an oil inlet hole 42, the interior of the oil inlet hole 42 is provided with a first through-tube 31, the interior of the first through-tube 31 is provided with a turbine blade 34, the right side surface of the turbine blade 34 is provided with a rotating shaft 35, the right side of the rotating shaft 35 is provided with a rotating column 36, the rotating column 36 is installed on the inner wall of the first through-tube 31, and the left side surface of the turbine blade 34 is fixedly connected with a first movable column 37. The first movable column 37 is installed by inserting the inner wall of the first through-tube 31, and the end of the first movable column 37 away from the turbine blade 34 is fixedly connected to the first bevel gear 38, and the surface of the first bevel gear 38 is meshedly connected to the second bevel gear 39, and the surface of the second bevel gear 39 is fixedly connected to the second movable column 40. The top of the second movable column 40 is provided with a second gear 41, and the second gear 41 and the third rack plate 30 are adapted to each other. The third rack plate 30 and the second gear 41 are meshed with each other. The left surface of the first through-tube 31 is sequentially provided with a second through-tube 32 and a third through-tube 33 from top to bottom, and a delivery pipe is installed between the second through-tube 32 and the third through-tube 33. The first through-tube 31 and the oil inlet hole 42 are adapted to each other, and the inner opening of the left connecting disk 6 A circuit port 17 is provided. A telescopic cylinder 16 is fixedly connected to the bottom end of the valve body 10. A telescopic spring is provided inside the telescopic cylinder 16. The telescopic cylinder 16 moves along with the movement of the valve body 10. A stabilizing ring 19 is provided on the surface of the telescopic cylinder 16. A stabilizing plate 20 is fixedly connected to the right surface of the stabilizing ring 19. The bottom end of the stabilizing plate 20 is fixedly connected to a first rack plate 21. The surface of the first rack plate 21 is meshed with a first gear 22. A movable shaft is provided on both sides of the surface of the first gear 22. A stabilizing shell 23 is provided on the surface of the movable shaft. A connecting plate 24 is fixedly connected to the back of the stabilizing shell 23. The connecting plate 24 is mounted on the inner wall of the return oil valve body 1. The bottom end surface of the first gear 22 is meshed with a second rack plate 25. The surface of the first gear 22 A slide groove is provided on one side of the surface, and the slide groove and the second rack plate 25 are adapted to each other: a telescopic rod 27 is fixedly connected to the right surface of the second rack plate 25, and a bottom plate 26 is provided on the bottom surface of the second rack plate 25. The bottom end of the bottom plate 26 is fixedly connected to the third rack plate 30, and the end of the telescopic rod 27 away from the second rack plate 25 is fixedly connected to the sealing plate 28. The return oil amount inside the return oil valve body 1 is measured by the rotor flowmeter body 12, and accurate data is obtained after the measurement. Then, the oil enters the interior of the return oil valve body 1 from the interior of the oil inlet cylinder 15. When the oil pressure inside the return oil valve body 1 increases, it is lifted up through the valve body 10, and then the return port 17 is opened, so that the oil flows back to the oil tank from the interior of the return port 17. Before flowing back to the oil tank,When the valve body 10 rises, the telescopic cylinder 16 is driven to rise by the valve body 10, so that the telescopic cylinder 16 drives the stabilizing ring 19 and the stabilizing plate 20 to rise, thereby driving the first rack plate 21 to rotate on the surface of the first gear 22, thereby driving the first gear 22 to rotate, and the first gear 22 drives the second rack plate 25 to move forward, so that the second rack plate 25 drives the telescopic rod 27 to move forward, and the telescopic rod 27 pushes the sealing plate 28 to the surface of the mounting ring 29, thereby sealing the oil inlet 18, and also being able to The oil inlet hole 42 is sealed to a certain extent, thereby sealing the oil inlet port 18, and the remaining oil in the oil return valve body 1 will directly flow into the interior of the oil tank through the return port 17, thereby reducing the pressure inside the oil return valve body 1, thereby being able to quickly release the pressure, solving the problem of slow pressure relief speed in the past, and after the pressure relief, the sealing plate 28 returns to its original position, and oil can still be quickly introduced through the oil inlet cylinder 15 and the oil inlet hole 42, ensuring the oil supply effect of the device, and then oil is supplied simultaneously through the first through pipe 31, the second through pipe 32 and the third through pipe 33. When the second rack plate 25 starts to move to the right, the second rack plate 25 can drive the bottom plate 26 and the third rack plate 30 to move to the right as a whole. Then, after the sealing plate 28 is abutted against the inside of the mounting ring 29, the second rack plate 25 stops moving. Then, when the second rack plate 25 moves to the left, the third rack plate 30 also moves at the same time. When the third rack plate 30 abuts against the surface of the second gear 41, the second gear 41 starts to rotate, thereby the second gear 41 drives the second movable column 40 to rotate. The second movable column 40 and the second bevel gear 39 drive the first bevel gear 38 to rotate, thereby driving the first movable column 37 to rotate. When the first movable column 37 rotates, oil begins to flow into the first passage 31. Before the oil flows in, the turbine blades 34 rotate inside the first passage 31. As a result, the turbine blades 34 rotate faster under the weight of the oil, thereby quickly transporting the oil. This also prevents blockage inside the first passage 31, solving the problem of slow oil transportation efficiency caused by blockage in the past.

[0031] Working principle: When the staff uses this device, first connect the device to an external power supply to provide power support for the device. When in use, first measure the return oil volume inside the return valve body 1 through the rotor flowmeter body 12, and obtain accurate data after the measurement. Then the oil enters the inside of the return valve body 1 from the inside of the oil inlet cylinder 15. When the oil pressure inside the return valve body 1 increases, the valve body 10 is lifted up, and then the return port 17 is opened, so that the oil flows back to the oil tank from the inside of the return port 17. Before flowing back to the oil tank, when the valve body 10 rises, the telescopic cylinder 16 is driven to rise through the valve body 10, so that the telescopic cylinder 16 will drive the stabilizing ring 19 and the stabilizing plate 20 rise, thereby driving the first rack plate 21 to rotate on the surface of the first gear 22, thereby driving the first gear 22 to rotate, the first gear 22 drives the second rack plate 25 to move forward, thereby the second rack plate 25 drives the telescopic rod 27 to move forward, the telescopic rod 27 pushes the sealing plate 28 to the surface of the mounting ring 29, thereby sealing the oil inlet 18, and can also seal the oil inlet hole 42 to a certain extent, thereby sealing the oil inlet 18, and the remaining oil in the return valve body 1 will directly flow into the interior of the oil tank through the return port 17, thereby reducing the pressure inside the return valve body 1, thereby enabling rapid pressure relief, solving the previous pressure relief problem. The problem of slow speed is solved, and after the pressure is released, the sealing plate 28 returns to its original position, and oil can be quickly fed in through the oil inlet cylinder 15 and the oil inlet hole 42 to ensure the oil supply effect of the device, and then oil is supplied simultaneously through the first through-pipe 31, the second through-pipe 32 and the third through-pipe 33. When the second rack plate 25 starts to move to the right, the second rack plate 25 can drive the bottom plate 26 and the third rack plate 30 to move to the right as a whole, and then after the sealing plate 28 is pressed against the inside of the mounting ring 29, the second rack plate 25 stops moving, and then when the second rack plate 25 moves to the left, the third rack plate 30 also moves at the same time, so that when the third rack plate 30 presses against After touching the surface of the second gear 41, the second gear 41 starts to rotate, so that the second gear 41 drives the second movable column 40 to rotate, and the second movable column 40 and the second bevel gear 39 drive the first bevel gear 38 to rotate, so that the first bevel gear 38 can drive the first movable column 37 to rotate. When the first movable column 37 rotates, oil starts to flow into the inside of the first through-tube 31 at the same time. Before the oil flows, the turbine blades 34 rotate inside the first through-tube 31, so that the turbine blades 34 rotate faster under the gravity of the oil, so that the oil can be transported quickly, and the inside of the first through-tube 31 can be prevented from being blocked. The above is all the working principles of the present invention.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A hydraulic metering pump return oil valve body for an excavator, comprising a return oil valve body (1), a first mounting flange (2) being provided at the top end of the return oil valve body (1), a second mounting flange (3) being provided at the top end of the first mounting flange (2), a valve cover (4) being provided at the top end of the second mounting flange (3), a right connecting plate (5) being provided at the right side surface of the return oil valve body (1), a left connecting plate (6) being provided at the left side surface of the return oil valve body (1), an oil return pipe (43) being provided inside the left connecting plate (6), and characterized in that: The bottom surface of the second mounting flange (3) is provided with a connecting piece (7), the interior of the valve cover (4) is provided with an adjusting screw (8), the bottom end of the adjusting screw (8) is provided with a valve body (10), the surface of the valve body (10) is provided with a spring net (9), the bottom end of the valve body (10) is provided with a gasket (11), and the bottom end of the valve body (10) is provided with a rotor flowmeter body (12); A groove (13) is provided inside the oil return valve body (1), and the groove (13) and the valve body (10) are adapted to each other. An oil inlet (18) is provided inside the right connecting plate (5), and an oil inlet cylinder (15) is provided inside the oil inlet (18). A return port (17) is provided inside the left connecting plate (6). The bottom end of the valve body (10) is fixedly connected to a telescopic cylinder (16), and a telescopic spring is provided inside the telescopic cylinder (16). The telescopic cylinder (16) moves along with the movement of the valve body (10). A stabilizing ring (19) is provided on the surface of the telescopic cylinder (16), and a stabilizing plate (20) is fixedly connected to the right surface of the stabilizing ring (19). The bottom end of the stabilizing plate (20) is fixedly connected to a first rack plate (21), and the surface of the first rack plate (21) is meshedly connected. A first gear (22) is provided, movable shafts are provided on both sides of the surface of the first gear (22), a stabilizing shell (23) is provided on the surface of the movable shaft, a connecting plate (24) is fixedly connected to the back of the stabilizing shell (23), and the connecting plate (24) is installed on the inner wall of the return oil valve body (1), the bottom end surface of the first gear (22) is meshedly connected to the second rack plate (25), a sliding groove is provided on one side of the surface of the first gear (22), and the sliding groove and the second rack plate (25) are adapted to each other, a telescopic rod (27) is fixedly connected to the right surface of the second rack plate (25), a bottom plate (26) is provided on the bottom end surface of the second rack plate (25), and the bottom end of the bottom plate (26) is fixedly connected to the third rack plate (30), and the end of the telescopic rod (27) away from the second rack plate (25) is fixedly connected to the sealing plate (28).

2. The oil return valve body of the hydraulic metering pump for an excavator according to claim 1, characterized in that: A mounting ring (29) is fixedly connected to the inner side wall of the oil inlet (18), and the mounting ring (29) and the sealing plate (28) are adapted to each other.

3. The oil return valve body of the hydraulic metering pump for an excavator according to claim 1, characterized in that: An oil inlet hole (42) is provided on the inner bottom wall of the oil inlet cylinder (15), a first through tube (31) is provided inside the oil inlet hole (42), and the first through tube (31) and the oil inlet hole (42) are adapted to each other.

4. The oil return valve body of the hydraulic metering pump for an excavator according to claim 3, characterized in that: A second through-tube (32) and a third through-tube (33) are sequentially arranged on the left side surface of the first through-tube (31) from top to bottom, and a delivery pipe is installed between the second through-tube (32) and the third through-tube (33).

5. The oil return valve body of the hydraulic metering pump for an excavator according to claim 3, characterized in that: A turbine blade (34) is provided inside the first through tube (31), a rotating shaft (35) is provided on the right side surface of the turbine blade (34), a rotating column (36) is provided on the right side of the rotating shaft (35), and the rotating column (36) is installed on the inner wall of the first through tube (31). A first movable column (37) is fixedly connected to the left side surface of the turbine blade (34), and the first movable column (37) is inserted into the inner wall of the first through tube (31) for installation. An end of the first movable column (37) away from the turbine blade (34) is fixedly connected to a first bevel gear (38), a surface of the first bevel gear (38) is meshedly connected to a second bevel gear (39), a surface of the second bevel gear (39) is fixedly connected to a second movable column (40), and a top end of the second movable column (40) is provided with a second gear (41).

6. The oil return valve body of the hydraulic metering pump for an excavator according to claim 5, characterized in that: The second gear (41) and the third rack plate (30) are adapted to each other, and the third rack plate (30) and the second gear (41) are meshed and connected to each other.

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