A large center valve casting for a construction machine

Abstract

This utility model relates to a large-scale engineering machinery central valve body casting. During the production process, the central valve body casting incorporates large sand cores for the first, second, third, and fourth vertical flow channels, as well as smaller sand cores for the remaining vertical, horizontal, and arc-shaped flow channels, designed and manufactured according to the product's flow channel structure. The advantages are: ingenious design, reasonable and compact structure; the vertical, horizontal, and arc-shaped flow channel designs ensure easy machining and casting; maximizing the machining of the entire valve body flow channel in one operation; reducing subsequent drilling operations; reducing processes; and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of valve body casting production, specifically to a large-scale engineering machinery center valve body casting. Background Technology

[0002] The XIV32.01-1C center valve body is a large-scale engineering machinery main valve body jointly developed at the request of XCMG Research Institute and in response to market demand. The project product conforms to the support content in the "National Key Supported High-tech Fields" and the "Guidelines for Key Areas of Current Priority Development of High-tech Industrialization". Since its trial production, the project product has undergone two years of development and has now passed customer inspection, trial use, and product quality inspection. The trial production summary is as follows.

[0003] Because the valve body is a large casting with a small main hole, it is difficult to ensure straightness. In addition, the internal flow channels of the casting are complex and there are many hot spots, making it prone to local breakage and shrinkage. The main research content of this project is to solve the problem of straightness of the main hole of the large, complex flow channel multi-way valve and the shrinkage phenomenon of the casting, which is difficult to process. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model proposes a large-scale engineering machinery central valve body casting, which is ingeniously designed and has a reasonable and compact structure. The vertical flow channel, horizontal flow channel and arc-shaped flow channel design ensure that the product is easy to process and cast.

[0005] The technical solution of this utility model: A large engineering machinery center valve body casting includes a main body, a first vertical flow channel, a second vertical flow channel, a third vertical flow channel, a fourth vertical flow channel, a fifth vertical flow channel, a sixth vertical flow channel, a first block-shaped flow channel, and a second block-shaped flow channel. The main body is in the shape of a rectangular body. The main body has four flow channels at the front: the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel. The main body has three flow channels at the rear: the first rear flow channel, the second rear flow channel, and the third rear flow channel. The main body is designed with 9 flow channels, namely the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, the sixth flow channel, the seventh flow channel, the eighth flow channel, and the ninth flow channel. The main body is designed with 6 flow channels below, namely the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, and the sixth flow channel; The main body has five flow channels on the left side: left first flow channel, left second flow channel, left third flow channel, left fourth flow channel, and left fifth flow channel. The main body has seven flow channels on the right side: right flow channel one, right flow channel two, right flow channel three, right flow channel four, right flow channel five, right flow channel six, and right flow channel seven. The first, second, third, fourth, fifth, and sixth vertical flow channels within the main body are divided into two rows. The upper ends of the first, second, third, fourth, fifth, and sixth vertical flow channels are connected and pass through the first block-shaped flow channel, respectively connecting to the upper flow channel opening, upper second flow channel opening, upper third flow channel opening, upper fourth flow channel opening, upper fifth flow channel opening, and upper sixth flow channel opening at the upper end of the main body. The lower ends of the first, second, third, fourth, fifth, and sixth vertical flow channels are connected and pass through the second block-shaped flow channel, respectively connecting to the lower flow channel opening, lower second flow channel opening, lower third flow channel opening, lower fourth flow channel opening, lower fifth flow channel opening, and lower sixth flow channel opening at the lower end of the main body. The front right sides of the first block-shaped flow channel and the second block-shaped flow channel are connected by the first arc-shaped flow channel; the front left side of the first block-shaped flow channel is connected to the previous flow channel opening by a transverse flow channel; the front left side of the first block-shaped flow channel is connected to the first vertical small flow channel by a transverse flow channel, and the upper end of the first vertical small flow channel is connected to the upper seven flow channel openings; the front left side of the second block-shaped flow channel is connected to the first four flow channel openings by a transverse flow channel. The first vertical flow channel is provided with a first annular groove, a second annular groove, and a third annular groove from top to bottom. The first annular groove is connected to the openings of the first two flow channels through a transverse flow channel. The front ends of the first annular groove and the third annular groove are connected through a second arc-shaped flow channel. The middle of the second arc-shaped flow channel is connected to the openings of the first two flow channels through a transverse flow channel. The lower left side of the second arc-shaped flow channel is connected to the opening of the left flow channel through a transverse flow channel. The second vertical flow channel is provided with a fourth annular groove and a fifth annular groove from top to bottom; The third vertical flow channel is provided with the sixth, seventh, and eighth annular grooves in sequence from top to bottom; the front end of the fifth annular groove is connected to the front end of the seventh annular groove through the third arc-shaped flow channel, the lower right side of the second arc-shaped flow channel is connected to the left side of the third arc-shaped flow channel, and the right side of the third arc-shaped flow channel is connected to the right first flow channel opening through a transverse flow channel; the sixth annular groove is connected to the right second flow channel opening through a transverse flow channel, and the eighth annular groove is connected to the right third flow channel opening through a transverse flow channel; The fourth vertical flow channel is provided with the ninth annular groove, the tenth annular groove, the eleventh annular groove, the twelfth annular groove, and the thirteenth annular groove from top to bottom; The fifth vertical flow channel is provided with the fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth annular grooves in sequence from top to bottom; The fourth vertical flow channel is provided with the nineteenth annular groove, the twentieth annular groove, the twenty-first annular groove, the twenty-second annular groove, and the twenty-third annular groove from top to bottom; The rear end of the second annular groove is connected to the front end of the eleventh annular groove through a transverse flow channel; the rear end of the fourth annular groove is connected to the front end of the fifteenth annular groove through a flow channel; the rear end of the fifth annular groove is connected to the front end of the seventeenth annular groove through a fourth arc-shaped flow channel; the left side of the fourth arc-shaped flow channel, near the middle position, is connected to the lower end of the second vertical small flow channel through a transverse flow channel; the left side of the lower end of the second vertical small flow channel is connected to the left second flow channel opening through a transverse flow channel. The middle right side of the first block-shaped flow channel and the middle right side of the second block-shaped flow channel are connected by a vertical rectangular flow channel, and the middle rear side of the vertical rectangular flow channel is connected to the twenty-first annular groove by a horizontal flow channel. The left side of the tenth annular groove is connected to the left side of the twelfth annular groove through the fifth arc-shaped flow channel; the middle of the left side of the fifth arc-shaped flow channel is connected to the left third flow channel opening through a transverse flow channel, and the upper end of the transverse flow channel is connected to the lower end of the third vertical small flow channel, the upper end of the third vertical small flow channel is connected to the upper ninth flow channel opening; the middle of the third vertical small flow channel, the middle of the second vertical small flow channel, and the lower end of the first vertical small flow channel are connected through a transverse flow channel. The right end of the fourteenth annular groove is connected to the left end of the nineteenth annular groove through a transverse flow channel. The right end of the eighteenth annular groove is connected to the left end of the twenty-third annular groove through a transverse flow channel. The right end of the twentieth annular groove is connected to the right fourth flow channel opening through a transverse flow channel. The right end of the twenty-second annular groove is connected to the right fifth flow channel opening through a transverse flow channel. The left rear end of the first block-shaped flow channel is connected to the outlet of the next flow channel via a flow channel, and the left rear end of the first block-shaped flow channel is connected to the outlet of the left fifth flow channel via a flow channel. The rear end of the ninth annular groove is connected to the right sixth flow channel opening through the sixth arc-shaped flow channel; the rear end of the eleventh annular groove is connected to the rear second flow channel opening through a transverse flow channel; the rear end of the sixteenth annular groove is connected to the left fourth flow channel opening through the seventh arc-shaped flow channel, and the seventh arc-shaped flow channel is also connected to the lower end of the transverse flow channel at the rear end of the eleventh annular groove; the rear end of the thirteenth annular groove is connected to the right seventh flow channel opening through the eighth arc-shaped flow channel. The rear end of the second block-shaped flow channel is connected to the three flow channel openings via a flow channel on the left side; the rear end of the nineteenth annular groove is connected to the rear end of the twenty-third annular groove via a ninth arc-shaped flow channel.

[0006] The main body has a rectangular boss at both the front and rear ends of its top and bottom surfaces. Each of the four rectangular bosses has an L-shaped stepped groove in the middle of its inner side. The left side of each of the four rectangular bosses is flush with the left end face of the main body, and a gap is formed between the right side of each of the four rectangular bosses and the main body. A double-layered stepped groove is located in the middle of the rear side of the main body's right end face. This double-layered stepped groove includes a first-layered groove and a second-layered groove. The rear end of the first-layered groove connects to the rear end face of the main body, and a second-layered stepped groove is located in the middle of the rear end of the first-layered groove. The rear end of the second-layered groove connects to the right end face of the main body. An L-shaped stepped groove is located in the middle of the left side of the main body's upper end face, with the upper eighth and ninth flow channels located at the bottom of this L-shaped stepped groove near the front and rear sides.

[0007] Both the first and second block-shaped flow channels are designed with support columns in the middle.

[0008] The central valve body casting has an outline dimension of 430*330*320mm and a weight of 200 kg.

[0009] The advantages of this utility model are: ingenious design, reasonable and compact structure, vertical flow channel, horizontal flow channel and arc flow channel design ensure that the product is easy to process and cast, can maximize the processing of the whole valve body flow channel in one go, reduce subsequent drilling and other operations, reduce processes and improve production efficiency. Attached Figure Description

[0010] Figure 1-2 This is a front and rear perspective view of this utility model.

[0011] Figure 3-7 This is a front-view vertical sectional view (internal flow channel display diagram) of this utility model from front to back.

[0012] Figure 8 This is a rear-view vertical sectional view (internal flow channel display diagram) of this utility model.

[0013] Figure 9 This is a longitudinal sectional view (internal flow channel display diagram) of the present invention from the side view near the right end.

[0014] Figure 10 This is a longitudinal sectional view of the present invention from the left side (showing the internal flow channel). Detailed Implementation

[0015] See attached document Figure 1-10 A large-scale engineering machinery center valve body casting is produced by creating a cavity in a sand box according to the product's shape during the manufacturing process. Then, based on the product's flow channel structure, large sand cores are designed and manufactured for the first vertical flow channel 1, second vertical flow channel 2, third vertical flow channel 3, fourth vertical flow channel 4, fifth vertical flow channel 5, sixth vertical flow channel 6, first block-shaped flow channel 7, and second block-shaped flow channel 8, along with small sand cores for the corresponding vertical, horizontal, and arc-shaped flow channels and other flow channels. The large sand cores for the main flow channels and the small sand cores for the other flow channels are then placed in the cavity of the sand box. The sand box is closed, and molten iron is poured in through the pre-reserved riser and gating system. After cooling, the sand box is opened, the valve body casting is removed, and the internal sand cores are cleaned and extracted, completing the machining process. Before placing the large sand core of the main channel and the small sand cores of the other channels into the sand box, a layer of water-based coating is applied to their surfaces. The large sand core of the main channel is placed horizontally in the sand box, with a layer of asbestos cloth placed at one end of the large sand core. A 120mm diameter high-heat riser is reserved in the middle of the top of the sand box, and a chill is placed at the bottom of the sand box. The casting process is carried out using a side thin gate casting process. After casting, the molten iron in the high-heat riser is stirred with water using a metal stirring rod. After stirring for 1-2 minutes, a layer of heat-insulating agent is sprinkled on top of the high-heat riser. The large and small sand cores are made of high-strength HAGHD290 sand core sand. A φ10mm diameter hollow core skeleton is set in the middle of the large sand core of the main channel. This invention utilizes a 120mm diameter high-heat riser with a dedicated chill placed on the bottom. Simultaneous pouring from both sides via a thin side gating system not only directly prevents overheating at the riser but also significantly reduces molten iron erosion of the mold and core, shortening pouring time and effectively dispersing heat. After pouring, mechanical stirring continuously agitates the riser to prevent the formation of unfillable small molten pools. Finally, a layer of insulating material is sprinkled over the riser, effectively ensuring its filling function. The casting was then cross-sectioned and subjected to dye penetrant testing, revealing no shrinkage cavities or porosity defects. Other requirements also meet the QT600-3 standard, and the casting's appearance is impeccable.

[0016] The central valve body casting includes a main body 10, a first vertical flow channel 1, a second vertical flow channel 2, a third vertical flow channel 3, a fourth vertical flow channel 4, a fifth vertical flow channel 5, a sixth vertical flow channel 6, a first block-shaped flow channel 7, and a second block-shaped flow channel 8. The main body 10 is in the shape of a rectangular body. The main body 10 has four flow channels at the front, namely the first flow channel 11, the second flow channel 12, the third flow channel 13, and the fourth flow channel 14. The main body 10 has three flow channels at the rear, namely the first rear flow channel 21, the second rear flow channel 22, and the third rear flow channel 23. The main body 10 is designed with 9 flow channels, namely the first flow channel 31, the second flow channel 32, the third flow channel 33, the fourth flow channel 34, the fifth flow channel 35, the sixth flow channel 36, the seventh flow channel 37, the eighth flow channel 38, and the ninth flow channel 39. The main body 10 has 6 flow channels below it, namely the first flow channel 41, the second flow channel 42, the third flow channel 43, the fourth flow channel 44, the fifth flow channel 45, and the sixth flow channel 46. The main body 10 has five flow channels on its left side: left flow channel 51, left flow channel 52, left flow channel 53, left flow channel 54, and left flow channel 55. The main body 10 has 7 flow channels on the right side, namely the first right flow channel 61, the second right flow channel 62, the third right flow channel 63, the fourth right flow channel 64, the fifth right flow channel 65, the sixth right flow channel 66, and the seventh right flow channel 67. The first vertical flow channel 1, the second vertical flow channel 2, the third vertical flow channel 3, the fourth vertical flow channel 4, the fifth vertical flow channel 5, and the sixth vertical flow channel 6 within the main body 10 are divided into two rows, front and back. The upper ends of the first vertical flow channel 1, the second vertical flow channel 2, the third vertical flow channel 3, the fourth vertical flow channel 4, the fifth vertical flow channel 5, and the sixth vertical flow channel 6 are connected and pass through the first square flow channel 7, and then respectively connect to the upper flow channel opening 31, the upper second flow channel opening 32, and the upper third flow channel opening 33 at the upper end of the main body 10. The lower ends of the flow channel 33, the upper fourth flow channel 34, the upper fifth flow channel 35, the upper sixth flow channel 36, the first vertical flow channel 1, the second vertical flow channel 2, the third vertical flow channel 3, the fourth vertical flow channel 4, the fifth vertical flow channel 5, and the sixth vertical flow channel 6 are connected and pass through the second block-shaped flow channel 8, and then respectively connect to the lower end of the main body 10 to the next flow channel 41, the lower second flow channel 42, the lower third flow channel 43, the lower fourth flow channel 44, the lower fifth flow channel 45, and the lower sixth flow channel 46; The front right sides of the first block-shaped flow channel 7 and the second block-shaped flow channel 8 are connected by the first arc-shaped flow channel 20; the front left side of the first block-shaped flow channel 7 is connected to the previous flow channel opening 11 through a transverse flow channel; the front left side of the first block-shaped flow channel 7 is connected to the first vertical small flow channel 81 through a transverse flow channel, and the upper end of the first vertical small flow channel 81 is connected to the upper seven flow channel opening 37; the front left side of the second block-shaped flow channel 8 is connected to the front four flow channel opening 14 through a transverse flow channel. The first vertical flow channel 1 is provided with a first annular groove 71, a second annular groove 72, and a third annular groove 73 from top to bottom. The first annular groove 71 is connected to the first two flow channel openings 12 through a transverse flow channel. The front ends of the first annular groove 71 and the third annular groove 73 are connected through a second arc-shaped flow channel. The middle of the second arc-shaped flow channel is connected to the first two flow channel openings 12 through a transverse flow channel. The lower left side of the second arc-shaped flow channel is connected to the left first flow channel opening 51 through a transverse flow channel. The second vertical flow channel 2 is provided with a fourth annular groove 74 and a fifth annular groove 75 from top to bottom; The third vertical flow channel 3 is provided with a sixth annular groove 76, a seventh annular groove 77, and an eighth annular groove 78 from top to bottom; the front end of the fifth annular groove 75 is connected to the front end of the seventh annular groove 77 through the third arc-shaped flow channel, the lower right end of the second arc-shaped flow channel is connected to the left side of the third arc-shaped flow channel, and the right side of the third arc-shaped flow channel is connected to the right first flow channel opening 61 through a transverse flow channel; the sixth annular groove 76 is connected to the right second flow channel opening 62 through a transverse flow channel, and the eighth annular groove 78 is connected to the right third flow channel opening 63 through a transverse flow channel; The fourth vertical flow channel 4 is provided with the ninth annular groove 79, the tenth annular groove 710, the eleventh annular groove 711, the twelfth annular groove 712, and the thirteenth annular groove 713 from top to bottom; The fifth vertical flow channel 5 is provided with the fourteenth annular groove 714, the fifteenth annular groove 715, the sixteenth annular groove 716, the seventeenth annular groove 717, and the eighteenth annular groove 718 from top to bottom; The fourth vertical flow channel 4 is provided with the nineteenth annular groove 719, the twentieth annular groove 720, the twenty-first annular groove 721, the twenty-second annular groove 723, and the twenty-third annular groove 724 from top to bottom; The rear end of the second annular groove 72 is connected to the front end of the eleventh annular groove 711 through a transverse flow channel; the rear end of the fourth annular groove 74 is connected to the front end of the fifteenth annular groove 715 through a flow channel; the rear end of the fifth annular groove 75 is connected to the front end of the seventeenth annular groove 717 through a fourth arc-shaped flow channel; the left side of the fourth arc-shaped flow channel, near the middle position, is connected to the lower end of the second vertical small flow channel 82 through a transverse flow channel; the left side of the lower end of the second vertical small flow channel 82 is connected to the left second flow channel opening 52 through a transverse flow channel. The middle right side of the first block-shaped flow channel 7 and the middle right side of the second block-shaped flow channel 8 are connected by a vertical rectangular flow channel 30, and the middle rear side of the vertical rectangular flow channel is connected to the twenty-first annular groove 721 by a transverse flow channel. The left side of the tenth annular groove 710 and the left side of the twelfth annular groove 712 are connected by the fifth arc-shaped flow channel; the middle of the left side of the fifth arc-shaped flow channel is connected to the left third flow channel opening 53 by a transverse flow channel, and the upper end of the transverse flow channel is connected to the lower end of the third vertical small flow channel 83, and the upper end of the third vertical small flow channel 83 is connected to the upper ninth flow channel opening 39; the middle of the third vertical small flow channel 83, the middle of the second vertical small flow channel 82, and the lower end of the first vertical small flow channel 81 are connected by a transverse flow channel; The right end of the fourteenth annular groove 714 is connected to the left end of the nineteenth annular groove 719 through a transverse flow channel; the right end of the eighteenth annular groove 718 is connected to the left end of the twenty-third annular groove 724 through a transverse flow channel; the right end of the twentieth annular groove 720 is connected to the right fourth flow channel opening 64 through a transverse flow channel; and the right end of the twenty-second annular groove 723 is connected to the right fifth flow channel opening 65 through a transverse flow channel. The left rear end of the first block-shaped flow channel 7 is connected to the first flow channel opening 21 through a flow channel, and the left rear end of the first block-shaped flow channel 7 is connected to the left fifth flow channel opening 55 through a flow channel. The rear end of the ninth annular groove 79 is connected to the right sixth flow channel opening 66 through the sixth arc-shaped flow channel; the rear end of the eleventh annular groove 711 is connected to the rear second flow channel opening 22 through a transverse flow channel; the rear end of the sixteenth annular groove 716 is connected to the left fourth flow channel opening 54 through the seventh arc-shaped flow channel, and the seventh arc-shaped flow channel is also connected to the lower end of the transverse flow channel at the rear end of the eleventh annular groove 711; the rear end of the thirteenth annular groove 713 is connected to the right seventh flow channel opening 67 through the eighth arc-shaped flow channel. The rear left side of the second block-shaped flow channel 8 is connected to the third flow channel opening 23 through a flow channel; the rear end of the nineteenth annular groove 719 and the rear end of the twenty-third annular groove 724 are connected through the ninth arc-shaped flow channel.

[0017] The main body 10 has a rectangular protrusion 9 at its top and bottom front and rear ends, and an L-shaped step 91 is provided in the middle of the inner side of each of the four rectangular protrusions 9. The left side of each of the four rectangular protrusions 9 is flush with the left end face of the main body 10, and a gap is formed between the right side of the four rectangular protrusions 9 and the main body 10. A double-layer stepped groove 101 is provided in the middle of the rear side of the side end face of the main body 10. The double-layer stepped groove 101 includes a first-layer stepped groove and a second-layer stepped groove. The rear end of the first-layer stepped groove is connected to the rear end face of the main body 10, and a second-layer stepped groove is designed in the middle of the rear end of the first-layer stepped groove. The rear end of the second-layer stepped groove is connected to the right end face of the main body 10. An L-shaped stepped groove is provided in the middle of the left side of the upper end face of the main body, and the upper eighth flow channel and the upper ninth flow channel are located at the bottom of the L-shaped stepped groove near the front and rear sides.

[0018] The first block-shaped flow channel 7 and the second block-shaped flow channel 8 are both designed with support columns in the middle.

[0019] The water-based coating is HA377 water-based coating with a certain amount of graphite powder added as a coating material. The Baumé degree of the coating material is adjusted to 35°Bé-42°Bé. For this design, due to the dense and complex flow channels of the casting, the concentrated heat during pouring makes it easy to mold and sinter, resulting in defects. Therefore, the requirements for the coating of the sand core are also crucial. This utility model uses HA377 water-based coating with a certain amount of graphite powder added as a coating material, and the Baumé degree of the coating material is adjusted to 35°Bé-42°Bé. If the Baumé degree is too high, it is easy for the coating material to accumulate. If the Baumé degree is too low, it will not play a coating role. Therefore, the Baumé degree of the coating material in this utility model is set at 35°Bé-42°Bé, which is the most reasonable and can effectively prevent sintering and ensure the surface quality of the flow channels.

[0020] The asbestos cloth is 1.5mm thick. Due to the large expansion force of the casting, its tendency to expand, and the inability to place core supports, the main hole is prone to bending. To ensure the straightness of the casting is less than 1.0mm, the core reinforcement was enlarged to control the bending. Core supports were placed at all possible locations, but the results were not ideal. Although the bending was reduced, the problem of bending in the main hole was not completely solved. Therefore, this invention uses asbestos cloth with a 1.5mm gap at all the core ends of the main hole. When the casting expands, there is a 1.5mm gap to accommodate it, thus preventing the main hole from bending. Combined with timely cooling by the chills on the bottom surface, the straightness of the main hole is ensured to be within 1.0mm.

[0021] The central valve body casting has an outline dimension of 430*330*320mm and a weight of 200 kg.

[0022] Determination of key parameters for valve body: 1) Material: QT600-3; 2) Body tensile strength: ≥550 MPa; 3) Yield strength: ≥340 MPa; 3) HB hardness: 190-270; 4) Spheroidization level: 1-3; 5) The metallographic structure should conform to the evaluation criteria of GB / T 9441-2009; 6) Graphite size grades: 6-8; 7) Free from casting defects such as inclusions, porosity, shrinkage cavities, and shrinkage porosity; 8) Valve body weight: 200KG.

Claims

1. A large construction machine center valve block casting, characterized by, The central valve body casting includes a main body, a first vertical flow channel, a second vertical flow channel, a third vertical flow channel, a fourth vertical flow channel, a fifth vertical flow channel, a sixth vertical flow channel, a first block-shaped flow channel, and a second block-shaped flow channel. The main body is in the shape of a rectangular body. The main body has four flow channels at the front: the first flow channel, the second flow channel, the third flow channel, and the fourth flow channel. The main body has three flow channels at the rear: the first rear flow channel, the second rear flow channel, and the third rear flow channel. The main body is designed with 9 flow channels, namely the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, the sixth flow channel, the seventh flow channel, the eighth flow channel, and the ninth flow channel. The main body is designed with 6 flow channels below, namely the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, and the sixth flow channel; The main body has five flow channels on the left side: left first flow channel, left second flow channel, left third flow channel, left fourth flow channel, and left fifth flow channel. The main body has seven flow channels on the right side: right flow channel one, right flow channel two, right flow channel three, right flow channel four, right flow channel five, right flow channel six, and right flow channel seven. The first, second, third, fourth, fifth, and sixth vertical flow channels within the main body are divided into two rows. The upper ends of the first, second, third, fourth, fifth, and sixth vertical flow channels are connected and pass through the first block-shaped flow channel, respectively connecting to the upper flow channel opening, upper second flow channel opening, upper third flow channel opening, upper fourth flow channel opening, upper fifth flow channel opening, and upper sixth flow channel opening at the upper end of the main body. The lower ends of the first, second, third, fourth, fifth, and sixth vertical flow channels are connected and pass through the second block-shaped flow channel, respectively connecting to the lower flow channel opening, lower second flow channel opening, lower third flow channel opening, lower fourth flow channel opening, lower fifth flow channel opening, and lower sixth flow channel opening at the lower end of the main body. The front right sides of the first block-shaped flow channel and the second block-shaped flow channel are connected by the first arc-shaped flow channel; the front left side of the first block-shaped flow channel is connected to the previous flow channel opening by a transverse flow channel; the front left side of the first block-shaped flow channel is connected to the first vertical small flow channel by a transverse flow channel, and the upper end of the first vertical small flow channel is connected to the upper seven flow channel openings; the front left side of the second block-shaped flow channel is connected to the first four flow channel openings by a transverse flow channel. The first vertical flow channel is provided with a first annular groove, a second annular groove, and a third annular groove from top to bottom. The first annular groove is connected to the openings of the first two flow channels through a transverse flow channel. The front ends of the first annular groove and the third annular groove are connected through a second arc-shaped flow channel. The middle of the second arc-shaped flow channel is connected to the openings of the first two flow channels through a transverse flow channel. The lower left side of the second arc-shaped flow channel is connected to the opening of the left flow channel through a transverse flow channel. The second vertical flow channel is provided with a fourth annular groove and a fifth annular groove from top to bottom; The third vertical flow channel is provided with the sixth, seventh, and eighth annular grooves in sequence from top to bottom; the front end of the fifth annular groove is connected to the front end of the seventh annular groove through the third arc-shaped flow channel, the lower right side of the second arc-shaped flow channel is connected to the left side of the third arc-shaped flow channel, and the right side of the third arc-shaped flow channel is connected to the right first flow channel opening through a transverse flow channel; the sixth annular groove is connected to the right second flow channel opening through a transverse flow channel, and the eighth annular groove is connected to the right third flow channel opening through a transverse flow channel; The fourth vertical flow channel is provided with the ninth annular groove, the tenth annular groove, the eleventh annular groove, the twelfth annular groove, and the thirteenth annular groove from top to bottom; The fifth vertical flow channel is provided with the fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth annular grooves in sequence from top to bottom; The fourth vertical flow channel is provided with the nineteenth annular groove, the twentieth annular groove, the twenty-first annular groove, the twenty-second annular groove, and the twenty-third annular groove from top to bottom; The rear end of the second annular groove is connected to the front end of the eleventh annular groove through a transverse flow channel; the rear end of the fourth annular groove is connected to the front end of the fifteenth annular groove through a flow channel; the rear end of the fifth annular groove is connected to the front end of the seventeenth annular groove through a fourth arc-shaped flow channel; the left side of the fourth arc-shaped flow channel, near the middle position, is connected to the lower end of the second vertical small flow channel through a transverse flow channel; the left side of the lower end of the second vertical small flow channel is connected to the left second flow channel opening through a transverse flow channel. The middle right side of the first block-shaped flow channel and the middle right side of the second block-shaped flow channel are connected by a vertical rectangular flow channel, and the middle rear side of the vertical rectangular flow channel is connected to the twenty-first annular groove by a horizontal flow channel. The left side of the tenth annular groove is connected to the left side of the twelfth annular groove through the fifth arc-shaped flow channel; the middle of the left side of the fifth arc-shaped flow channel is connected to the left third flow channel opening through a transverse flow channel, and the upper end of the transverse flow channel is connected to the lower end of the third vertical small flow channel, the upper end of the third vertical small flow channel is connected to the upper ninth flow channel opening; the middle of the third vertical small flow channel, the middle of the second vertical small flow channel, and the lower end of the first vertical small flow channel are connected through a transverse flow channel. The right end of the fourteenth annular groove is connected to the left end of the nineteenth annular groove through a transverse flow channel. The right end of the eighteenth annular groove is connected to the left end of the twenty-third annular groove through a transverse flow channel. The right end of the twentieth annular groove is connected to the right fourth flow channel opening through a transverse flow channel. The right end of the twenty-second annular groove is connected to the right fifth flow channel opening through a transverse flow channel. The left rear end of the first block-shaped flow channel is connected to the outlet of the next flow channel via a flow channel, and the left rear end of the first block-shaped flow channel is connected to the outlet of the left fifth flow channel via a flow channel. The rear end of the ninth annular groove is connected to the right sixth flow channel opening through the sixth arc-shaped flow channel; the rear end of the eleventh annular groove is connected to the rear second flow channel opening through a transverse flow channel; the rear end of the sixteenth annular groove is connected to the left fourth flow channel opening through the seventh arc-shaped flow channel, and the seventh arc-shaped flow channel is also connected to the lower end of the transverse flow channel at the rear end of the eleventh annular groove; the rear end of the thirteenth annular groove is connected to the right seventh flow channel opening through the eighth arc-shaped flow channel. The rear end of the second block-shaped flow channel is connected to the three flow channel openings via a flow channel on the left side; the rear end of the nineteenth annular groove is connected to the rear end of the twenty-third annular groove via a ninth arc-shaped flow channel.

2. A large construction machine center valve casting according to claim 1, characterized in that, The main body has a rectangular boss at both the front and rear ends of its top and bottom surfaces. Each of the four rectangular bosses has an L-shaped stepped groove in the middle of its inner side. The left side of each of the four rectangular bosses is flush with the left end face of the main body, and a gap is formed between the right side of each of the four rectangular bosses and the main body. A double-layered stepped groove is located in the middle of the rear side of the main body's right end face. This double-layered stepped groove includes a first-layered groove and a second-layered groove. The rear end of the first-layered groove connects to the rear end face of the main body, and a second-layered stepped groove is located in the middle of the rear end of the first-layered groove. The rear end of the second-layered groove connects to the right end face of the main body. An L-shaped stepped groove is located in the middle of the left side of the main body's upper end face, with the upper eighth and ninth flow channels located at the bottom of this L-shaped stepped groove near the front and rear sides.

3. The large-scale engineering machinery center valve body casting according to claim 1, characterized in that, Both the first and second block-shaped flow channels are designed with support columns in the middle.

4. A large-scale engineering machinery center valve body casting according to claim 1, characterized in that, The central valve body casting has an outline dimension of 430*330*320mm and a weight of 200 kg.

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