Hydraulic valve body casting of large loader

Abstract

The utility model discloses a large-scale loader hydraulic valve body casting which comprises a large-scale loader hydraulic valve body casting body, a liquid inlet is formed in one side of the large-scale loader hydraulic valve body casting body, a main oil way is formed in the large-scale loader hydraulic valve body casting body, the liquid inlet is communicated with the main oil way, and the liquid inlet is communicated with the main oil way. A liquid outlet is formed in the other side of the large-scale loader hydraulic valve body casting body, the main oil way is communicated with the liquid outlet, a plurality of annular cavities are formed in the large-scale loader hydraulic valve body casting body, the annular cavities are all communicated with the main oil way, and a plurality of branch oil ways are formed in the large-scale loader hydraulic valve body casting body. High-pressure hydraulic oil in the valve body can be shared by the liquid outlet, the branch oil ways and the mounting groove, so that the service life of the valve body is prolonged; and by arranging the reinforcing layer, the buffering layer and the buffering layer can be made of different materials, fatigue cracking of the oil way structure is avoided, and practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of valve body casting technology, and in particular to a hydraulic valve body casting for a large loader. Background Technology

[0002] Currently, large excavators with a capacity of 20 tons or more have higher requirements for the structure and precision of their hydraulic valves, especially valves with multiple oil circuits.

[0003] Traditional hydraulic valve bodies generally adopt a single main oil passage and a straight branch oil passage design, which can lead to local high pressure areas due to unreasonable hydraulic oil distribution. Long-term use can easily cause stress concentration inside the valve body, and some hydraulic valve bodies may experience fatigue cracking of the oil passage structure. Existing technologies use a uniform coating (such as nitriding) for different functional areas such as the main oil passage and the buffer chamber, without considering differentiated needs, resulting in a narrow range of applications. To solve the above problems, this application proposes a casting for a large loader hydraulic valve body. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and propose a large loader hydraulic valve body casting. By setting an outlet, multiple branch oil passages and mounting grooves, the high-pressure hydraulic oil inside the valve body can be distributed, thus extending the service life of the valve body. By setting a reinforcing layer, a buffer layer and a buffer layer and using different materials, fatigue cracking of the oil passage structure can be avoided, making it highly practical.

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

[0006] A hydraulic valve body casting for a large loader includes a main body, an inlet on one side of the main body, a main oil passage connected to the inlet, an outlet on the other side connected to the main oil passage, multiple annular cavities connected to the main oil passage, multiple branch oil passages, multiple mounting slots on the top of the main body, each branch oil passage connected to its corresponding mounting slot, two connecting slots connected to their respective annular cavities, and a sealing ring fixedly connected to the inner wall of each inlet.

[0007] Preferably, the inner walls of both the inlet and outlet are provided with a first external thread, and the main body of the large loader hydraulic valve casting has two grooves, and the two sealing rings are respectively installed in the corresponding grooves and fixedly connected to them.

[0008] Preferably, the plurality of annular cavities are distributed at equal intervals, the rear branch oil passages are connected to the middle annular cavity, the two middle branch oil passages are respectively connected to the middle annular cavity, and the front branch oil passages are respectively connected to their corresponding connecting grooves.

[0009] Preferably, the branch oil passage is arranged in a frustum shape, and the inner wall of the mounting groove is provided with a second external thread.

[0010] Preferably, the inner wall of the main oil passage is provided with a reinforcing layer, the reinforcing layer being a tungsten carbide coating; the inner wall of the annular cavity is provided with a buffer layer, the buffer layer being a titanium alloy coating; and the inner wall of the branch oil passage is provided with a protective layer, the protective layer being a graphene-modified ductile iron coating.

[0011] Preferably, the top and bottom of the large loader hydraulic valve body casting are provided with four threaded mounting holes, and the four threaded mounting holes are arranged in a rectangular pattern.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] 1. By setting up an outlet, multiple branch oil circuits and mounting grooves, the high-pressure hydraulic oil inside the valve body can be distributed, thus extending the service life of the valve body.

[0014] 2. By setting up reinforcement layers, buffer layers, and buffer layers, different materials can be used to avoid fatigue cracking of the oil circuit structure, making it highly practical.

[0015] In summary, by setting up an outlet, multiple branch oil circuits, and mounting grooves, the high-pressure hydraulic oil inside the valve body can be distributed, extending the service life of the valve body; by setting up reinforcing layers, buffer layers, and buffer layers, different materials can be used to avoid fatigue cracking of the oil circuit structure, making it highly practical. Attached Figure Description

[0016] Figure 1 This is a first structural schematic diagram of a large loader hydraulic valve body casting proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the second structure of a large loader hydraulic valve body casting proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the first cross-sectional structure of a large loader hydraulic valve body casting proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of the second cross-section of a hydraulic valve body casting for a large loader proposed in this utility model.

[0020] In the diagram: 1. Large loader hydraulic valve body casting, 2. Inlet, 3. Main oil circuit, 4. Outlet, 5. Annular cavity, 6. Branch oil circuit, 7. Mounting groove, 8. Connecting groove, 9. Sealing ring, 10. Threaded mounting hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-4 A large loader hydraulic valve body casting includes a large loader hydraulic valve body casting body 1. The casting material of the large loader hydraulic valve body casting body 1 is QT500-7, which is isothermally quenched and has a hardness of HBW280-320. A liquid inlet 2 is opened on one side of the large loader hydraulic valve body casting body 1, which is threadedly connected to an external oil inlet pipe. A main oil passage 3 is opened inside the large loader hydraulic valve body casting body 1, and the liquid inlet 2 is connected to the main oil passage 3. A liquid outlet 4 is opened on the other side of the large loader hydraulic valve body casting body 1, which is threadedly connected to an external oil outlet pipe. The main oil passage 3 is connected to the liquid outlet 4. The inner walls of the liquid inlet 2 and the liquid outlet 4 are both provided with a first external thread. Two grooves are opened on the large loader hydraulic valve body casting body 1, and two sealing rings 9 are respectively installed in the corresponding grooves and fixedly connected to them, which can ensure the sealing between the large loader hydraulic valve body casting body 1 and the external pipe.

[0023] The hydraulic valve body casting 1 of the large loader has multiple annular cavities 5 inside, all of which are connected to the main oil passage 3. The hydraulic valve body casting 1 also has multiple branch oil passages 6 inside. The annular cavities 5 are evenly spaced. The rear branch oil passage 6 is connected to the middle annular cavity 5, allowing some hydraulic oil to be discharged. The two middle branch oil passages 6 are connected to the middle annular cavity 5, allowing some hydraulic oil to be discharged again. The front branch oil passages 6 are connected to their corresponding connecting grooves 8, allowing some hydraulic oil to be discharged again. The top of the hydraulic valve body casting 1 has multiple mounting grooves 7, with each branch oil passage 6 connected to its corresponding mounting groove 7. The branch oil passage 6 is frustum-shaped and has a tapering structure from the outside to the inside to reduce fluid resistance. The inner wall of the mounting groove 7 has a second external thread, allowing for sealing between the mounting groove 7 and the external branch pipeline.

[0024] The hydraulic valve body casting 1 of the large loader has two connecting grooves 8 inside, and the two connecting grooves 8 are respectively connected to their corresponding annular cavities 5. Each inlet 2 has a sealing ring 9 fixedly connected to its inner wall to ensure the sealing of the connection.

[0025] The inner wall of the main oil passage 3 is provided with a reinforcing layer made of tungsten carbide coating, which can ensure the strength of the main oil passage 3. The inner wall of the annular cavity 5 is provided with a buffer layer made of titanium alloy coating, which can withstand hydraulic impact stress. The inner wall of the branch oil passage 6 is provided with a protective layer made of graphene modified ductile iron coating, which can enhance the tensile strength of the branch oil passage 6. The top and bottom of the large loader hydraulic valve body casting body 1 are provided with four threaded mounting holes 10, which are arranged in a rectangular shape. The large loader hydraulic valve body casting body 1 can be installed and fixed by bolts and threaded mounting holes 10.

[0026] In this utility model, external hydraulic oil is drawn from the oil tank and injected into the hydraulic valve body casting 1 of the large loader through the inlet 2. A portion of the hydraulic oil is discharged from the outlet 4, and the remaining portion is discharged from multiple branch oil passages 6 and mounting grooves 7 to the branch pipelines. The hydraulic oil can be distributed into multiple branch lines for flow discharge. The branch oil passages 6 adopt a tapered structure in conjunction with the annular cavity 5 to form a Venturi effect, reducing the overall flow resistance.

Claims

1. A large loader hydraulic valve body casting comprising a large loader hydraulic valve body casting body (1), characterized in that, The large loader hydraulic valve body casting body (1) is provided with a liquid inlet (2) on one side, a main oil way (3) is arranged in the large loader hydraulic valve body casting body (1), the liquid inlet (2) is in communication with the main oil way (3), a liquid outlet (4) is arranged on the other side of the large loader hydraulic valve body casting body (1), the main oil way (3) is in communication with the liquid outlet (4), a plurality of ring cavities (5) are arranged in the large loader hydraulic valve body casting body (1), the plurality of ring cavities (5) are in communication with the main oil way (3), a plurality of branch oil ways (6) are arranged in the large loader hydraulic valve body casting body (1), a plurality of mounting grooves (7) are arranged on the top of the large loader hydraulic valve body casting body (1), each branch oil way (6) is in communication with the corresponding mounting groove (7), two communication grooves (8) are arranged in the large loader hydraulic valve body casting body (1), the two communication grooves (8) are in communication with the corresponding ring cavities (5), and the inner wall of each liquid inlet (2) is fixedly connected with a sealing ring (9).

2. A large loader hydraulic valve body casting as defined in Claim 1 wherein, The inner walls of the liquid inlet (2) and the liquid outlet (4) are provided with first external threads, two grooves are arranged on the large loader hydraulic valve body casting body (1), and the two sealing rings (9) are arranged in the corresponding grooves and fixedly connected therewith.

3. A large loader hydraulic valve body casting as defined in Claim 1 wherein, The plurality of ring cavities (5) are distributed at equal intervals, the rear branch oil way (6) is in communication with the middle ring cavity (5), the two middle branch oil ways (6) are in communication with the middle ring cavity (5), and the front branch oil way (6) is in communication with the corresponding communication groove (8).

4. A large loader hydraulic valve body casting as defined in Claim 1 wherein, The branch oil way (6) is in the shape of a circular truncated cone, and the inner wall of the mounting groove (7) is provided with second external threads.

5. A large loader hydraulic valve body casting as defined in Claim 1 wherein, The inner wall of the main oil way (3) is provided with a reinforcing layer, the reinforcing layer is made of a tungsten carbide coating layer, the inner wall of the ring cavity (5) is provided with a buffer layer, the buffer layer is made of a titanium alloy coating layer, the inner wall of the branch oil way (6) is provided with a protective layer, and the protective layer is made of a graphene modified nodular graphite coating layer.

6. A large loader hydraulic valve body casting as defined in Claim 1 wherein, The top and the bottom of the large loader hydraulic valve body casting body (1) are provided with four threaded mounting holes (10), and the four threaded mounting holes (10) are arranged in a rectangular distribution.

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