High-precision anti-deformation main valve body casting for excavator

Abstract

The utility model relates to a high-precision anti-deformation main valve body casting for an excavator, which comprises a rectangular main body, a large sand core for manufacturing a first longitudinal flow channel, a second longitudinal flow channel, a third longitudinal flow channel and a fourth longitudinal flow channel, and a small sand core for manufacturing a vertical flow channel, a transverse flow channel, an arc-shaped flow channel and other flow channels which are matched with each other. The utility model has the advantages that the ceramic core bar is arranged in the large sand core of the main runner, and the high-strength sand core is adopted, so that the bending strength of the main hole is improved and the straightness is ensured through combination of the ceramic core bar and the high-strength sand core; the inner runner is free of sand core cracking and fin; the core support is added, so that the runner is not deformed after dissecting; the surface of the sand core is coated with the coating, sintering is prevented, and the surface quality of the runner is guaranteed; a high exothermic riser is used at the top and two auxiliary risers are added to effectively exhaust air, so that the casting is smooth in surface and free of slag inclusion; the special chilling block is placed on the bottom surface, so that the overheating phenomenon at the riser is avoided, the shell mold and the sand core are prevented from being scoured by molten iron, the pouring time is shortened, heat is well dispersed, and shrinkage cavity and shrinkage porosity are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the valve body casting production field, concretely relates to a high-precision anti-deformation main valve body casting for excavator. BACKGROUND

[0002] ZYJFKZ-14-B-1MP valve body is the integral main valve body jointly developed with Zoomlion, mainly used for excavator control system, and has large market demand.The internal structure of the valve body casting is complex, casting production is difficult, and it is very critical to determine which process to produce, and through research and analysis, it is determined to adopt the coated sand shell mold resin sand molding process.The valve body has complex internal structure, is composed of multiple sand cores, has complex internal structure, large sand core gas emission, poor exhaust, and is easy to form defects such as air hole;And a small amount of slag defects exist in the outer shape;The sand core hole is small, is easy to deform in a high-temperature state, internal dimensions are difficult to control, and high dimensional accuracy is required. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the above technical problems, the utility model provides a high-precision anti-deformation main valve body casting for excavator, which is ingenious in design, reasonable and compact in structure, and longitudinal flow channel, transverse flow channel and arc-shaped flow channel design ensure that the product is easy to process and cast.

[0004] The technical scheme of the utility model comprises the following:

[0005] The high-precision anti-deformation main valve body casting for excavator,

[0006] The main valve body casting for excavator comprises a main body, a first longitudinal flow channel, a second longitudinal flow channel, a third longitudinal flow channel and a fourth longitudinal flow channel, and the main body is in the shape of a rectangular body,

[0007] Four flow channel openings are designed on the front face of the main body, which are a first flow channel opening, a second flow channel opening, a third flow channel opening and a fourth flow channel opening;

[0008] Four flow channel openings are designed on the rear face of the main body, which are a first flow channel opening, a second flow channel opening, a third flow channel opening and a fourth flow channel opening;

[0009] Seven flow channel openings are designed on the upper face of the main body, which are a first flow channel opening, a second flow channel opening, a third flow channel opening, a fourth flow channel opening, a fifth flow channel opening, a sixth flow channel opening and a seventh flow channel opening;

[0010] One flow channel opening is designed on the left face of the main body, which is a first flow channel opening;

[0011] Four longitudinal flow channels are designed on the front and rear of the main body, which are a first longitudinal flow channel, a second longitudinal flow channel, a third longitudinal flow channel and a fourth longitudinal flow channel from left to right;

[0012] The first longitudinal flow channel is designed with five annular grooves from front to back, which are first annular groove, second annular groove, third annular groove, fourth annular groove and fifth annular groove; the front end of the first longitudinal flow channel is communicated with the front flow channel port, and the rear end of the first longitudinal flow channel is communicated with the rear flow channel port; a first arc-shaped flow channel is designed above the first longitudinal flow channel, the front and rear ends of the first arc-shaped flow channel are communicated with the upper ends of the first annular groove and the fifth annular groove respectively, and the front and rear ends of the first arc-shaped flow channel are also communicated with the positions close to the port of the front and rear ends of the first longitudinal flow channel through an auxiliary arc-shaped flow channel respectively; a rectangular groove is further designed on the left side of the fifth annular groove, and a rectangular groove is also designed on the right side of the first annular groove and the fourth annular groove respectively; a first vertical flow channel is arranged on the left side of the first annular groove and the second annular groove of the first longitudinal flow channel, the rear end of the first vertical flow channel is communicated with the position close to the middle of the third annular groove through a second arc-shaped flow channel, the upper end of the first vertical flow channel is communicated with the previous flow channel port, and the lower end of the first vertical flow channel is communicated with the left flow channel port through a horizontal flow channel;

[0013] The second longitudinal flow channel is designed with three annular grooves from front to back, which are sixth annular groove, seventh annular groove and eighth annular groove; the front end of the second longitudinal flow channel is communicated with the front second flow channel port, and the rear end of the second longitudinal flow channel is communicated with the rear second flow channel port; a third arc-shaped flow channel is designed below the second longitudinal flow channel, the front end of the third arc-shaped flow channel is communicated with the lower end of the seventh annular groove, and the rear end of the third arc-shaped flow channel is communicated with the position below the rear end of the second longitudinal flow channel close to the port; a second vertical flow channel is arranged above the sixth annular groove of the second longitudinal flow channel, the lower end of the second vertical flow channel is communicated with the upper end of the sixth annular groove through an L-shaped flow channel, and the upper end of the second vertical flow channel is communicated with the upper second flow channel port;

[0014] The left side of the seventh annular groove is communicated with the right side of the second annular groove through a horizontal flow channel;

[0015] The third longitudinal flow channel is designed with five annular grooves from front to back, which are ninth annular groove, tenth annular groove, eleventh annular groove, twelfth annular groove and thirteenth annular groove; the front end of the third longitudinal flow channel is communicated with the front third flow channel port, and the rear end of the third longitudinal flow channel is communicated with the rear third flow channel port; a fourth arc-shaped flow channel is designed on the right side of the third longitudinal flow channel, the front end of the fourth arc-shaped flow channel is communicated with the right side of the ninth annular groove, and the rear end of the fourth arc-shaped flow channel is communicated with the right side of the thirteenth annular groove;

[0016] The left side of the eleventh annular groove is communicated with the right side of the eighth annular groove through a horizontal flow channel;

[0017] The fourth longitudinal flow channel is sequentially designed with five annular grooves from front to back, which are the fourteenth annular groove, the fifteenth annular groove, the sixteenth annular groove, the seventeenth annular groove and the eighteenth annular groove; the front end of the fourth longitudinal flow channel is communicated with the front four flow channel port, and the rear end of the fourth longitudinal flow channel is communicated with the rear four flow channel port; the lower portion of the fourth longitudinal flow channel is designed with a fifth arc-shaped flow channel, the front end of the fifth arc-shaped flow channel is communicated with the lower end of the fourteenth annular groove, the rear end of the fifth arc-shaped flow channel is communicated with the lower end of the eighteenth annular groove, and the front and rear ends of the fifth arc-shaped flow channel are further communicated with the front and rear ends of the fourth longitudinal flow channel through an auxiliary arc-shaped flow channel, respectively, at the lower end position close to the port portion.

[0018] The left side of the front end of the fourth longitudinal flow channel close to the port portion is communicated with the right side position of the front end of the third longitudinal flow channel close to the port portion through a transverse flow channel.

[0019] The upper portion of the fourteenth annular groove of the fourth longitudinal flow channel is provided with a third vertical flow channel, the upper end of the third vertical flow channel is communicated with the upper six flow channel port, and the lower end of the third vertical flow channel is communicated with the upper end of the fifteenth annular groove through an L-shaped flow channel.

[0020] The left side of the upper portion of the eighteenth annular groove of the fourth longitudinal flow channel is provided with a fourth vertical flow channel, the upper end of the fourth vertical flow channel is communicated with the upper five flow channel port, and the upper end of the sixteenth annular groove is communicated with the position close to the lower end of the fourth vertical flow channel through a sixth arc-shaped flow channel; the lower end of the fourth vertical flow channel is communicated with the lower end of the second vertical flow channel through a large L-shaped flow channel; the corner position of the large L-shaped flow channel is designed with a fifth vertical flow channel, the upper end of the fifth vertical flow channel is communicated with the upper three flow channel port, and the lower end of the fifth vertical flow channel is communicated with the corner position of the upper end of the large L-shaped flow channel; the middle upper end of the fourth arc-shaped flow channel is designed with a sixth vertical flow channel, the lower end of the sixth vertical flow channel penetrates and communicates with the middle upper end of the fourth arc-shaped flow channel communicated with the large L-shaped flow channel, and the upper end of the sixth vertical flow channel is communicated with the upper four flow channel port.

[0021] The upper end of the seventh vertical flow channel designed on the right upper portion of the rear end of the fourth longitudinal flow channel is communicated with the upper seven flow channel port, and the lower end of the seventh vertical flow channel is communicated with the right side of the seventeenth annular groove through an L-shaped flow channel.

[0022] The excavator main valve body casting has a profile size of 76*96*190mm and a weight of 13kg.

[0023] The inner sides of the two ends of the four longitudinal flow channels are designed into thickened annular grooves, and the outer sides of the port portions of the four longitudinal flow channels are respectively provided with an annular step.

[0024] The port portions of the seven vertical flow channels are designed into horn-shaped ports.

[0025] The port portion of the first transverse flow channel is designed into a horn-shaped port.

[0026] The utility model discloses a vertical flow channel, horizontal flow channel and arc flow channel design ensure that the product is easy to process and cast, can process the whole valve body flow channel once, reduce subsequent drilling operation, reduce the process, improve production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figures 1-2 It is the front, rear three-dimensional schematic diagram of the utility model.

[0028] Figure 3 It is the horizontal section planar schematic diagram of the vertical flow channel of the utility model.

[0029] Figure 4 It is the vertical section lateral schematic diagram of the first vertical flow channel of the utility model.

[0030] Figure 5 It is the vertical section lateral schematic diagram of the first vertical flow channel of the utility model.

[0031] Figure 6 It is the vertical section lateral schematic diagram of the second vertical flow channel of the utility model.

[0032] Figure 7 It is the vertical section lateral schematic diagram of the third vertical flow channel of the utility model.

[0033] Figure 8 It is the vertical section lateral schematic diagram of the fifth, sixth vertical flow channel of the utility model.

[0034] Figure 9 It is the vertical section lateral schematic diagram of the fourth vertical flow channel of the utility model.

[0035] Figure 10 It is the vertical section lateral schematic diagram of the fourth vertical flow channel of the utility model.

[0036] Figure 11 It is the vertical section lateral schematic diagram of the seventh vertical flow channel of the utility model.

[0037] Figure 12 It is the horizontal section planar schematic diagram of the big L type flow channel of the utility model.

[0038] Figures 13-14 It is the front, rear three-dimensional schematic diagram of the whole sand core of the utility model. DETAILED DESCRIPTION

[0039] Referring to the drawings Figures 1-14 High-precision deformation-preventing main valve body casting for excavator,

[0040] The excavator main valve body casting includes a main body 1, a first longitudinal flow channel 11, a second longitudinal flow channel 12, a third longitudinal flow channel 13, and a fourth longitudinal flow channel 14, wherein the main body 1 is a rectangular body,

[0041] The main body 1 is designed with four flow channel openings in the front, namely a first flow channel opening 21, a second flow channel opening 22, a third flow channel opening 23, and a fourth flow channel opening 24;

[0042] The main body 1 is designed with four flow channel openings in the back, namely a first flow channel opening 31, a second flow channel opening 32, a third flow channel opening 33, and a fourth flow channel opening 34;

[0043] The main body 1 is designed with seven flow channel openings on the top, namely a first flow channel opening 41, a second flow channel opening 42, a third flow channel opening 43, a fourth flow channel opening 44, a fifth flow channel opening 45, a sixth flow channel opening 46, and a seventh flow channel opening 47;

[0044] The main body 1 is designed with one flow channel opening on the left, namely a first flow channel opening 51;

[0045] The main body 1 is designed with four longitudinal flow channels from front to back, namely a first longitudinal flow channel 11, a second longitudinal flow channel 12, a third longitudinal flow channel 13, and a fourth longitudinal flow channel 14;

[0046] The first longitudinal flow channel 11 is designed with five ring grooves from front to back, namely a first ring groove 101, a second ring groove 102, a third ring groove 103, a fourth ring groove 104, and a fifth ring groove 105; the front end of the first longitudinal flow channel 11 is connected to the first flow channel opening 21, and the rear end of the first longitudinal flow channel 11 is connected to the first flow channel opening 31; the first longitudinal flow channel 11 is designed with a first arc-shaped flow channel 61 above, the front and rear ends of which are connected to the upper ends of the first ring groove 101 and the fifth ring groove 105, respectively, and the front and rear ends of the first arc-shaped flow channel 61 are also connected to the positions close to the port of the front and rear ends of the first longitudinal flow channel 11 through an auxiliary arc-shaped flow channel; a rectangular groove is also designed on the left side of the fifth ring groove 105, and a rectangular groove is also designed on the right side of the first ring groove 101 and the fourth ring groove, respectively; a first vertical flow channel 71 is arranged on the left side of the first ring groove 101 and the second ring groove 102 of the first longitudinal flow channel 11, the rear end of the third ring groove 103 is connected to the position close to the middle of the first vertical flow channel 71 through a second arc-shaped flow channel 62, the upper end of the first vertical flow channel 71 is connected to the first flow channel opening 41, and the lower end of the first vertical flow channel 71 is connected to the first flow channel opening 51 through a horizontal flow channel on the left side;

[0047] The second longitudinal flow channel 12 is designed with three annular grooves from front to back, namely the sixth annular groove 106, the seventh annular groove 107 and the eighth annular groove 108; the front end of the second longitudinal flow channel 12 is communicated with the front second flow channel port 22, and the rear end of the second longitudinal flow channel 12 is communicated with the rear second flow channel port 32; the third arc-shaped flow channel 63 is designed below the second longitudinal flow channel 12, the front end of the third arc-shaped flow channel 63 is communicated with the lower end of the seventh annular groove 107, and the rear end of the third arc-shaped flow channel 63 is communicated with the lower end of the rear end of the second longitudinal flow channel 12 close to the port position; the second vertical flow channel 72 is arranged above the sixth annular groove 106 of the second longitudinal flow channel 12, the lower end of the second vertical flow channel 72 is communicated with the upper end of the sixth annular groove 106 through an L-shaped flow channel, and the upper end of the second vertical flow channel 72 is communicated with the upper second flow channel port 42;

[0048] The left side of the seventh annular groove 107 is communicated with the right side of the second annular groove 102 through a horizontal flow channel;

[0049] The third longitudinal flow channel 13 is designed with five annular grooves from front to back, namely the ninth annular groove 109, the tenth annular groove 110, the eleventh annular groove 111, the twelfth annular groove 112 and the thirteenth annular groove 113; the front end of the third longitudinal flow channel 13 is communicated with the front third flow channel port 23, and the rear end of the third longitudinal flow channel 13 is communicated with the rear third flow channel port 33; the fourth arc-shaped flow channel 64 is designed on the right side of the third longitudinal flow channel 13, the front end of the fourth arc-shaped flow channel 64 is communicated with the right side of the ninth annular groove 109, and the rear end of the fourth arc-shaped flow channel 64 is communicated with the right side of the thirteenth annular groove 113;

[0050] The left side of the eleventh annular groove 111 is communicated with the right side of the eighth annular groove 108 through a horizontal flow channel;

[0051] The fourth longitudinal flow channel 14 is designed with five annular grooves from front to back, namely the fourteenth annular groove 114, the fifteenth annular groove 115, the sixteenth annular groove 116, the seventeenth annular groove 117 and the eighteenth annular groove 118; the front end of the fourth longitudinal flow channel 14 is communicated with the front fourth flow channel port 24, and the rear end of the fourth longitudinal flow channel 14 is communicated with the rear fourth flow channel port 34; the fifth arc-shaped flow channel 65 is designed below the fourth longitudinal flow channel 14, the front end of the fifth arc-shaped flow channel 65 is communicated with the lower end of the fourteenth annular groove 114, the rear end of the fifth arc-shaped flow channel 65 is communicated with the lower end of the eighteenth annular groove 118, and the front and rear ends of the fifth arc-shaped flow channel 65 are also communicated with the lower end positions of the front and rear ends of the fourth longitudinal flow channel 14 close to the port through auxiliary arc-shaped flow channels respectively;

[0052] The left side of the front end of the fourth longitudinal flow channel 14 close to the port is communicated with the right side of the front end of the third longitudinal flow channel 13 close to the port through a horizontal flow channel;

[0053] The upper side of the fourteenth annular groove 114 of the fourth longitudinal flow channel 14 is provided with a third vertical flow channel 73, the upper end of the third vertical flow channel 73 is communicated with the upper six flow channel port 46, and the lower end of the third vertical flow channel 73 is communicated with the upper end of the fifteenth annular groove 115 through an L-shaped flow channel;

[0054] The left side of the upper side of the eighteenth annular groove 118 of the fourth longitudinal flow channel 14 is provided with a fourth vertical flow channel 74, the upper end of the fourth vertical flow channel 74 is communicated with the upper five flow channel port 45, and the upper end of the sixteenth annular groove 116 is communicated with the position close to the lower end of the fourth vertical flow channel 74 through the sixth arc-shaped flow channel 66; the lower end of the fourth vertical flow channel 74 is communicated with the lower end of the second vertical flow channel 72 through a large L-shaped flow channel 81; the corner position of the large L-shaped flow channel 81 is designed with a fifth vertical flow channel 75, the upper end of the fifth vertical flow channel 75 is communicated with the upper three flow channel port 43, and the lower end of the fifth vertical flow channel 75 is communicated with the corner position of the upper end of the large L-shaped flow channel 81; the middle upper end of the fourth arc-shaped flow channel 64 is designed with a sixth vertical flow channel 76, the lower end of the sixth vertical flow channel 76 penetrates and communicates with the middle upper end of the large L-shaped flow channel 81, and the upper end of the sixth vertical flow channel 76 is communicated with the upper four flow channel port 44;

[0055] The upper right side of the rear end of the fourth longitudinal flow channel 14 is designed with a seventh vertical flow channel 77, the upper end of the seventh vertical flow channel 77 is communicated with the upper seven flow channel port 47, and the lower end of the seventh vertical flow channel 77 is communicated with the right side of the seventeenth annular groove 117 through an L-shaped flow channel.

[0056] The inner sides of the two ends of the four longitudinal flow channels are designed into thickened annular grooves, and the outer sides of the ports of the four longitudinal flow channels are respectively provided with an annular step. The ports of the seven vertical flow channels are designed into horn-shaped ports. The port of the first transverse flow channel is designed into a horn-shaped port.

[0057] In the production process of the excavator main valve body casting, the type cavity in the sand box is made according to the product shape, and then the first longitudinal flow channel, the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel, the large sand core of the main flow channel and the small sand core of the rest flow channel are designed and manufactured according to the flow channel structure of the product, and then the main flow channel large sand core and the rest flow channel small sand core are placed in the sand box type cavity, the sand box is closed, the molten iron is poured from the reserved pouring hole, and after cooling, the sand box is opened, the valve body casting is taken out, and the internal sand core is cleaned out, and the processing is completed.

[0058] The large sand core of the main flow channel and the small sand core of the rest flow channel are coated with a layer of water-based paint before being put into the sand box; a high-heat riser is reserved in the middle of the sand box and two auxiliary risers are added, and cold iron is placed at the bottom of the sand box; a side thin gate pouring process is adopted for pouring, the large sand core and the small sand core are made of high-strength sand core sand, and a ceramic core bone with a diameter of Φ3*115mm is arranged in the middle of the large sand core of the main flow channel.

[0059] In order to prevent the sand core from bending, the ceramic core bone with a diameter of 3*115 mm is adopted, due to the large volume of the valve body, the top hot riser is adopted, and the molten iron is fed in the middle, the valve body casting is dissected, it is found that the inner cavity basically meets the requirements, but there is a small amount of slag on the outer shape, by increasing two auxiliary exhaust risers, the defect disappears; the sand core production adopts the HA high-strength GHD170 sand core, the main sand core is assembled together by multiple sand cores, the assembly interface is required to have no gap, after the sand core is assembled, it must be repaired and checked to ensure that there is no defect, and then the paint is applied and the core is baked, otherwise the casting will be scrapped due to the flash. After the sand core is baked, the shell is matched, the inner flow passage of the valve body is complex, the main hole is small, during pouring, the flow passage is bent and deformed at high temperature, the cold iron is placed at the bottom of the sand box to ensure that the straightness of the sand core is within the required range. After the shell matching is completed, considering that the size of the flow passage of the valve body is required to be high, the size must be controlled within the range of ±0.3 mm, the resin sand embedded shell process is adopted, the resin sand has high strength and the size is easy to control, the valve body is large in volume, the cold iron is added at the bottom surface to increase the chilling of the casting. After the special high-strength binder is adopted, there is no sand core cracking and flash in the inner flow passage. Due to the deformation of the sand core, the core support is increased, and there is no deformation in the flow passage after dissection, the casting is smooth in appearance and has no defects such as slag inclusion, and after the process improvement, the percentage of the qualified products reaches more than 95%.

[0060] The water-based paint is HA377 water-based paint, and a certain amount of graphite powder is added as the paint, and the Baume degree of the paint is adjusted to 35°Bé-42°Bé. For this design, due to the dense and complex flow passage of the casting, heat is dense during pouring, and molding and sintering defects are easy to occur, so the paint requirement for the sand core is also crucial, the utility model adopts HA377 water-based paint, and a certain amount of graphite powder is added as the paint, and the Baume degree of the paint is adjusted to 35°Bé-42°Bé, if the Baume degree is too high, the paint is easy to accumulate, if the Baume degree is too low, the paint cannot play a role, therefore, the Baume degree of the paint of the utility model is set to 35°Bé-42°Bé, which is the most reasonable, and can effectively prevent sintering, and can ensure the surface quality of the flow passage.

[0061] The main flow passage large sand core and the rest flow passage small sand core are produced by using high-strength GHD170 sand core.

[0062] The excavator main valve body casting has a profile size of 76*96*190 mm, and a weight of 13 kg.

[0063] The rectangular frame core 2 and the four door frame cores are connected to the middle inner side of the rectangular frame core at the front and back ends of the large core of the four longitudinal flow channels, and the four door frame cores are respectively supported and connected to the upper ends of the two sides of the rectangular frame core. From left to right, they are the first door frame core 3, the second door frame core 4, the third door frame core 5 and the fourth door frame core 6. The inner side of the first door frame core 3 on the left side is connected to the upper end of the small core of the first vertical flow channel, the inner side of the second door frame core 4 is connected to the upper end of the small core of the second vertical flow channel, the inner side of the third door frame core 5 is connected to the upper end of the small core of the fifth and sixth vertical flow channels, and the inner side of the fourth door frame core 6 is connected to the upper end of the small core of the seventh vertical flow channel. The upper ends of the third door frame core 5 and the fourth door frame core 6 are connected by a horizontal core 9, and the lower end of the horizontal core 9 is connected to the upper end of the small core of the fourth vertical flow channel. The lower ends of the two sides of the rectangular frame core 2 are respectively designed with vertical plate-shaped cores 7, and the left end of the small core of the first horizontal flow channel is connected to the inner side of the vertical plate-shaped core 7 on the left side. A core support 8 is placed above the small core of the sixth arc-shaped flow channel, and the upper end of the core support 8 is supported on the top inner side of the sand box. The inner side of the sand box is designed with grooves matched with the rectangular frame core, the door frame core and the vertical plate-shaped core. A groove is opened at the bottom of the sand box for placing cold iron. The sand box is designed as two upper and lower boxes, and the upper and lower boxes are buckled outside the whole core. After using special high-strength adhesive, the inner flow channel has no core cracking and other defects, and through the cooperation of the rectangular frame core 2 and the four door frame cores, the whole core is stable, the large core increases the ceramic core bone, and the core support is combined to increase the core support, and the dissection of the flow channel has no deformation.

[0064] Main technical parameters

[0065] Material: HT300, tensile strength ≥ 300 MPa, hardness 190-230 HB, dimensional tolerance control within ± 0.3, no shrinkage, shrinkage hole in the casting, smooth flow channel.

Claims

1. A high-precision deformation-resistant excavator main valve body casting, characterized in that, The excavator main valve body casting comprises a main body, a first longitudinal flow channel, a second longitudinal flow channel, a third longitudinal flow channel, and a fourth longitudinal flow channel, wherein the main body is a rectangular body, The front face of the main body is designed with four flow channel openings, namely a first flow channel opening, a second flow channel opening, a third flow channel opening, and a fourth flow channel opening; The rear face of the main body is designed with four flow channel openings, namely a first flow channel opening, a second flow channel opening, a third flow channel opening, and a fourth flow channel opening; The upper face of the main body is designed with seven flow channel openings, namely a first flow channel opening, a second flow channel opening, a third flow channel opening, a fourth flow channel opening, a fifth flow channel opening, a sixth flow channel opening, and a seventh flow channel opening; The left face of the main body is designed with one flow channel opening, namely a first flow channel opening; The front and rear of the main body are designed with four longitudinal flow channels, from left to right, namely a first longitudinal flow channel, a second longitudinal flow channel, a third longitudinal flow channel, and a fourth longitudinal flow channel; The first longitudinal flow channel is designed with five annular grooves from front to back, namely a first annular groove, a second annular groove, a third annular groove, a fourth annular groove, and a fifth annular groove; the front end of the first longitudinal flow channel is connected to the first flow channel opening, and the rear end of the first longitudinal flow channel is connected to the second flow channel opening; the first longitudinal flow channel is designed with a first arc-shaped flow channel above; the front and rear ends of the first arc-shaped flow channel are connected to the upper ends of the first annular groove and the fifth annular groove, respectively; the front and rear ends of the first arc-shaped flow channel are also connected to the positions close to the port of the front and rear ends of the first longitudinal flow channel through an auxiliary arc-shaped flow channel, respectively; the left side of the fifth annular groove is designed with a rectangular groove, and the right sides of the first annular groove and the fourth annular groove are also designed with a rectangular groove, respectively; the left side of the first annular groove and the second annular groove of the first longitudinal flow channel is provided with a first vertical flow channel; the left side of the third annular groove is connected to the rear end of the first vertical flow channel close to the middle position through a second arc-shaped flow channel; the upper end of the first vertical flow channel is connected to the first flow channel opening, and the lower end of the first vertical flow channel is connected to the first flow channel opening through a horizontal flow channel on the left side; The second longitudinal flow channel is designed with three annular grooves from front to back, namely a sixth annular groove, a seventh annular groove, and an eighth annular groove; the front end of the second longitudinal flow channel is connected to the second flow channel opening, and the rear end of the second longitudinal flow channel is connected to the third flow channel opening; the third longitudinal flow channel is designed with a third arc-shaped flow channel below; the front end of the third arc-shaped flow channel is connected to the lower end of the seventh annular groove, and the rear end of the third arc-shaped flow channel is connected to the lower end of the rear end of the second longitudinal flow channel close to the port; the second longitudinal flow channel is designed with a second vertical flow channel above the sixth annular groove; the lower end of the second vertical flow channel is connected to the upper end of the sixth annular groove through an L-shaped flow channel, and the upper end of the second vertical flow channel is connected to the second flow channel opening; The left side of the seventh annular groove is connected to the right side of the second annular groove through a horizontal flow channel; The third longitudinal flow channel is designed with five annular grooves from front to back, namely a ninth annular groove, a tenth annular groove, an eleventh annular groove, a twelfth annular groove, and a thirteenth annular groove; the front end of the third longitudinal flow channel is connected to the third flow channel opening, and the rear end of the third longitudinal flow channel is connected to the fourth flow channel opening; the right side of the third longitudinal flow channel is designed with a fourth arc-shaped flow channel; the front end of the fourth arc-shaped flow channel is connected to the right side of the ninth annular groove, and the rear end of the fourth arc-shaped flow channel is connected to the right side of the thirteenth annular groove; The left side of the eleventh annular groove is connected to the right side of the eighth annular groove through a horizontal flow channel. The fourth longitudinal flow channel is sequentially designed with five annular grooves from front to back, which are the fourteenth annular groove, the fifteenth annular groove, the sixteenth annular groove, the seventeenth annular groove and the eighteenth annular groove; the front end of the fourth longitudinal flow channel is communicated with the front four flow channel port, and the rear end of the fourth longitudinal flow channel is communicated with the rear four flow channel port; the lower portion of the fourth longitudinal flow channel is designed with a fifth arc-shaped flow channel, the front end of the fifth arc-shaped flow channel is communicated with the lower end of the fourteenth annular groove, the rear end of the fifth arc-shaped flow channel is communicated with the lower end of the eighteenth annular groove, and the front and rear ends of the fifth arc-shaped flow channel are further communicated with the front and rear ends of the fourth longitudinal flow channel through an auxiliary arc-shaped flow channel respectively. The left side of the front end of the fourth longitudinal flow channel close to the port is communicated with the right side of the front end of the third longitudinal flow channel close to the port through a transverse flow channel. The upper portion of the fourteenth annular groove of the fourth longitudinal flow channel is provided with a third vertical flow channel, the upper end of the third vertical flow channel is communicated with the upper six flow channel port, and the lower end of the third vertical flow channel is communicated with the upper end of the fifteenth annular groove through an L-shaped flow channel. The upper left portion of the eighteenth annular groove of the fourth longitudinal flow channel is provided with a fourth vertical flow channel, the upper end of the fourth vertical flow channel is communicated with the upper five flow channel port, the upper end of the sixteenth annular groove is communicated with the lower end of the fourth vertical flow channel through a sixth arc-shaped flow channel, and the lower end of the fourth vertical flow channel is communicated with the lower end of the second vertical flow channel through a large L-shaped flow channel; the corner position of the large L-shaped flow channel is designed with a fifth vertical flow channel, the upper end of the fifth vertical flow channel is communicated with the upper three flow channel port, and the lower end of the fifth vertical flow channel is communicated with the corner position of the large L-shaped flow channel; the middle upper end of the fourth arc-shaped flow channel is designed with a sixth vertical flow channel, the lower end of the sixth vertical flow channel penetrates and communicates with the middle upper end of the fourth arc-shaped flow channel, and the upper end of the sixth vertical flow channel is communicated with the upper four flow channel port. The upper right portion of the rear end of the fourth longitudinal flow channel is designed with a seventh vertical flow channel, the upper end of the seventh vertical flow channel is communicated with the upper seven flow channel port, and the lower end of the seventh vertical flow channel is communicated with the right side of the seventeenth annular groove through an L-shaped flow channel.

2. The high-precision anti-deformation excavator main valve body casting of claim 1, wherein the excavator main valve body casting has an outline size of 76*96*190mm and a weight of 13kg.

3. The high-precision anti-deformation excavator main valve body casting of claim 1, wherein the inner sides of the two ends of the four longitudinal flow channels are designed as thickened annular grooves, and the outer sides of the port portions of the four longitudinal flow channels are respectively provided with an annular step.

4. The high-precision anti-deformation excavator main valve body casting of claim 1, wherein the port portions of the seven vertical flow channels are designed as horn-shaped ports. The port portion of the first transverse flow channel is designed as a horn-shaped port. ​ ​ 5. The high-precision deformation-resistant excavator main valve body casting of claim 1, wherein, ​

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