CN210978670U - Main control valve body used for engineering machinery and sand burying molding die thereof - Google Patents

Abstract

The utility model relates to a main control valve body used by engineering machinery and a sand burying molding die thereof, wherein the sand burying molding die comprises a sand box and a sand core, the sand core is arranged in the sand box, a cavity is formed between the sand core and the sand box, and two risers and a pouring gate are arranged on the sand box; the sand box is characterized in that the sand box is formed by compacting iron ore sand mixed with resin sand; the riser is a phi 120 x 150 high-heating necking riser, and the diameter of the riser neck is 60 mm; the mud core is made of Jinying B570US magnetite sand, the mud core is formed by assembling a plurality of core bars, the assembling clearance of the mud core reaches 0.1mm, one core bar is a main core bar forming a main hole of the valve body, the main core bar is a phi 18 hollow tube, and the side surface of the mud core is perforated; the gate is a side gate. The casting defects of casting shrinkage cavity, shrinkage porosity, internal pores and the like, particularly the defect of micro pores in the casting are overcome, and the compactness of the internal structure is improved, so that no leakage exists under the high-pressure working state with the rated pressure of more than or equal to 35 Mpa.

Description

Main control valve body used for engineering machinery and sand burying molding die thereof

Technical Field

The utility model relates to a casting technical field, concretely relates to main control valve body that engineering machine used and bury sand molding die thereof.

Background

Although China is a large country for manufacturing engineering machinery at present, the production industry is large and not strong, the capacity of middle and low-grade products is excessive, high-grade hydraulic elements almost all depend on import, the development of the hydraulic industry is seriously lagged behind the development of the main machine industry, and the hydraulic industry becomes a main bottleneck for restricting the development of the equipment manufacturing industry. At present, the integral manufacturing technical level of the hydraulic part industry in China has a large gap compared with the international advanced country. The technical level of the valve body designed by Jiangyin Yibei hydraulic pressure Limited company is comparable with that of similar products in foreign advanced countries. The project product shows higher casting level and good development trend.

The large hydraulic main control valve body casting is a multilayer runner, the weight of the casting reaches 87.7KG, the casting belongs to a thick and large complex hydraulic part, the requirement on the appearance surface of the casting is very high, the runner of the casting is complex and very large, the surface of the casting is irregular, a chill cannot be placed, the riser of the casting is difficult to place, and the phenomenon of the shrinkage cavity level of the casting is very easy to cause.

Disclosure of Invention

The utility model provides a main control valve body that engineering machine tool used and bury sand molding die thereof.

The technical scheme of the utility model:

a main control valve body used for engineering machinery comprises a valve body, wherein the valve body is designed into a square block shape, two convex blocks are transversely arranged on the valve body, six channel openings are respectively arranged on the two convex blocks, two channel openings are respectively arranged in front of the two convex blocks, and a channel opening is arranged behind the right convex block; thirteen runner ports are arranged in front of the valve body; the back of the valve body is provided with ten runner ports.

Two longitudinal runners are arranged on the left side lug, namely an upper longitudinal runner and an upper two longitudinal runners respectively, three longitudinal runners are arranged on the right side lug, namely an upper three longitudinal runners, an upper four longitudinal runner and an upper five longitudinal runner respectively, and the upper four longitudinal runners and the upper five longitudinal runners are arranged in front of each other; the front ends of the upper three longitudinal flow channels and the upper two longitudinal flow channels are communicated with the two flow channel openings in front of the right bump correspondingly, and the rear ends of the upper five longitudinal flow channels are corresponding to one flow channel opening in back of the right bump.

Sixteen longitudinal flow passages are arranged in the valve body; the six longitudinal flow channels are positioned at the upper part of the valve body and are horizontally arranged, the front ends of the first longitudinal flow channel, the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel, the fifth longitudinal flow channel and the sixth longitudinal flow channel are sequentially arranged from left to right, the front ends of the first longitudinal flow channel, the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel, the fifth longitudinal flow channel and the sixth longitudinal flow channel are respectively communicated with six flow channel openings in the front of the valve body in a one-to-one correspondence manner, the rear ends of the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel and the fifth longitudinal flow channel are respectively communicated with four flow channel openings in the rear of the valve body, the eight longitudinal flow channels are positioned in the middle of the valve body and are a seventh longitudinal flow channel, an eighth longitudinal flow channel, a ninth longitudinal flow channel, a tenth longitudinal flow channel, an eleventh longitudinal flow channel, a twelfth longitudinal flow channel, a thirteenth longitudinal, the front end of the seventh longitudinal flow passage is communicated with a flow passage opening in the front of the valve body, the rear end of the seventh longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the eighth longitudinal flow passage is positioned below the second longitudinal flow passage, the rear end of the eighth longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the ninth longitudinal flow passage and the tenth longitudinal flow passage are positioned below the third longitudinal flow passage, the front end of the ninth longitudinal flow passage is communicated with a flow passage opening in the front of the valve body after one in front of the first longitudinal flow passage, the rear end of the tenth longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the eleventh longitudinal flow passage and the twelfth longitudinal flow passage are positioned below the fourth longitudinal flow passage, the front end of the eleventh longitudinal flow passage is communicated with a flow passage opening in the front of the valve body after one in front of the first longitudinal flow passage, the rear end of the twelfth longitudinal flow passage is communicated with a flow passage, the rear end of the thirteenth longitudinal flow passage is communicated with a flow passage opening at the back of the valve body, the fourteenth longitudinal flow passage is positioned below the sixth longitudinal flow passage, the front end of the fourteenth longitudinal flow passage is communicated with a flow passage opening at the front of the valve body, and the rear end of the fourteenth longitudinal flow passage is communicated with a flow passage opening at the back of the valve body; the two longitudinal runners are positioned at the lower part of the valve body and are a fifteenth longitudinal runner and a sixteenth longitudinal runner, the fifteenth longitudinal runner is positioned between the third longitudinal runner and the fourth longitudinal runner, the front end of the fifteenth longitudinal runner is communicated with a runner port in front of the valve body, the fifteenth longitudinal runner is positioned between the fourth longitudinal runner and the fifth longitudinal runner, and the front end of the sixteenth longitudinal runner is communicated with a runner port in front of the valve body.

Twelve vertical flow passages are arranged in the valve body and divided into a front row and a rear row, the upper ends of the left six vertical flow passages extend into the left convex block and are communicated with the six flow passage openings on the left convex block in a one-to-one correspondence manner, and the upper ends of the right six vertical flow passages extend into the right convex block and are communicated with the six flow passage openings on the right convex block in a one-to-one correspondence manner.

The vertical flow channel and the longitudinal flow channel are connected with the auxiliary flow channel through the annular groove in a matched mode.

Further, the technical parameters of the valve body are as follows: QT 500-7; the tensile strength of the body is as follows: not less than 500 MPa; yield strength: not less than 320 MPa; HB hardness: 180-230; spheroidization grade: 1-3 grade; the metallographic structure should meet the evaluation of GB/T9441-2009; graphite size grade: 6-8 grades; no slag inclusion, pores, shrinkage cavities and shrinkage porosity; the weight of the valve body is as follows: 87.7 KG.

A sand burying molding die of a main control valve body used by the engineering machinery comprises a sand box and a sand core, wherein the sand core is arranged in the sand box, a cavity is formed between the sand core and the sand box, and two risers and a pouring gate are arranged on the sand box; the sand box is characterized in that the sand box is formed by compacting iron ore sand mixed with resin sand; the riser is a phi 120 x 150 high-heating necking riser, and the diameter of the riser neck is 60 mm; the mud core is made of Jinying B570US magnetite sand, the mud core is formed by assembling a plurality of core bars, the assembling clearance of the mud core reaches 0.1mm, one core bar is a main core bar forming a main hole of the valve body, the main core bar is a phi 18 hollow tube, and the side surface of the mud core is perforated; the gate is a side gate; the mixed resin sand of the iron ore sand comprises: mixing 50KG iron ore sand with 150G furan resin for 5 minutes, then mixing the 50KG iron ore sand with 88G curing agent for 5 minutes, and then mixing and stirring the two to form the mixture; two phi 120 x 150 high-heating risers with riser neck diameter of 60mm are adopted; the influence of reverse feeding caused by the fact that the positions of the two risers are too close is greatly reduced, the preferred wall thickness part also adopts iron ore sand, the wall thickness part is preferentially solidified, the appearance is more perfect compared with that made by cold iron, and the riser can greatly improve the molten iron feeding capacity and efficiency. Meanwhile, the phenomenon of overheating at a riser is directly avoided by adopting the thin gates on the two side surfaces for water inflow, after pouring is finished, the casting is subjected to anatomical detection again, the defects of shrinkage cavities, shrinkage porosity and the like are not found, other requirements can also meet the standard of QT500-7, and the appearance of the casting is very perfect; analysis shows that the inoculant adopted by people has great influence on the defects, so that the silicon-strontium inoculant is adopted for inoculation, the phenomenon of coarse structure can be well solved, in addition, in order to find the defects after processing, the leakage phenomenon does not occur after pressure test of customers, and the compactness of the casting is improved. Because the casting has large expansion force and is easy to expand, the main hole is easy to bend due to the fact that the core support cannot be released, the machining allowance of the main valve core hole is strictly controlled by a customer, and if the straightness of the main hole is larger than 1mm, the casting cannot be machined directly! Therefore, in order to ensure that the straightness of the casting is less than or equal to 1.0mm, the problem that the main hole of the casting is bent cannot be solved by increasing the sand core bone, adding the weight and the like through multiple tests. Later, after a plurality of tests, drilling holes on the side surfaces of a phi 18 hollow pipe, preferentially cooling a main hole by using cooling of bottom magnetite sand, and changing a cylindrical riser into a necking riser to prevent a casting from expanding, so that the straightness of the main hole is ensured to be less than 1.0 mm; because the casting belongs to the main control hydraulic valve casting of large-scale complex class, for keeping the position degree of case hole, we assemble the loam core just according to the equipment mode of normal loam core earlier stage in the experiment, and after the appearance, the customer finds through processing that the position degree deviation of loam core case hole is very big, and foundry goods gear slot goes wrong. Around the problem, the sand core assembly is modified and tested for many times, and finally, the assembly gap of the sand core is controlled to be 0.1mm, and the sand core bonding tool is added to control the deviation of the sand core assembly. The problem of the castings not being machinable due to the assembly of the cores is improved over multiple assembly trials and re-samples to customer machining confirmation (as shown).

The utility model has the advantages that,

(1) the casting defects of casting shrinkage cavity, shrinkage porosity, internal pores and the like, particularly the defect of micro pores in the casting are overcome, and the compactness of the internal structure is improved, so that no leakage exists under the high-pressure working state with the rated pressure of more than or equal to 35 Mpa.

(2) And controlling the straightness of the cast blank of the main valve hole to be less than or equal to 1.0 millimeter.

(3) The clearance of the core assembly results in the control of dimensional deviations of the casting.

Drawings

Fig. 1 is a front view of a main control valve body used in a construction machine.

Fig. 2 is a rear view of a main control valve body used in a construction machine.

Fig. 3 is a left side view of a main control valve body used in a construction machine.

Fig. 4 is a right side view of a main control valve body used in the construction machine.

Fig. 5 is a plan view of a main control valve body used in the construction machine.

Fig. 6 is a bottom view of a main control valve body used in a construction machine.

FIG. 7 is a schematic sectional view taken along the line A-A in FIG. 1.

Fig. 8 is a partially enlarged schematic view of fig. 7.

Fig. 9 is a schematic sectional view taken along the direction of fig. 1B-B.

Fig. 10 is a partially enlarged schematic view (1) of fig. 9.

Fig. 11 is a partially enlarged view of fig. 9 (2).

Fig. 12 is a partially enlarged schematic view (3) of fig. 9.

Fig. 13 is a partially enlarged schematic view (4) of fig. 9.

Fig. 14 is a schematic cross-sectional view taken along the direction of fig. 1C-C.

Fig. 15 is a schematic cross-sectional view taken along the direction of D-D in fig. 1.

Fig. 16 is a schematic sectional view taken along the direction of fig. 1E-E.

Fig. 17 is a schematic sectional view in the direction of fig. 1F-F.

Fig. 18 is a schematic sectional view in the direction of fig. 1G-G.

Fig. 19 is a schematic sectional view taken along the direction H-H in fig. 1.

Fig. 20 is a schematic sectional view taken along the direction of J-J in fig. 4.

Fig. 21 is a schematic view in section taken along the direction of fig. 24L-L.

Fig. 22 is a schematic sectional view taken along the direction of fig. 4K-K.

Fig. 23 is a schematic sectional view in the direction of M-M in fig. 4.

Fig. 24 is a schematic cross-sectional view taken along the direction N-N of fig. 4.

Fig. 25 is a schematic cross-sectional view taken along the direction P-P in fig. 4.

Fig. 26 is a schematic sectional view taken along the direction of Q-Q in fig. 4.

Fig. 27 is a schematic cross-sectional view taken along the direction of R-R in fig. 2.

Fig. 28 is a schematic cross-sectional view taken along the line S-S of fig. 1.

Fig. 29 is a schematic sectional view taken along the direction T-T of fig. 2.

Fig. 30 is a perspective view of a main control valve body used in a construction machine.

In the figure, a left lug 1-1 of a valve body 1 and a right lug 1-2 of the valve body 1 are provided with a first longitudinal flow passage 5, a second longitudinal flow passage 6, a third longitudinal flow passage 7, a fourth longitudinal flow passage 8, a fifth longitudinal flow passage 10, a sixth longitudinal flow passage 11, a seventh longitudinal flow passage 12, an eighth longitudinal flow passage 13, a ninth longitudinal flow passage 14, an eleventh longitudinal flow passage 16, a thirteenth longitudinal flow passage 17, a fourteenth longitudinal flow passage 18, a fourteenth longitudinal flow passage 19, a fifteenth longitudinal flow passage 20 and a sixteenth longitudinal flow passage 21.

Detailed Description

As shown in fig. 1-30, a main control valve body for an engineering machine comprises a valve body 1, wherein the valve body 1 is designed into a square block shape, a left-side bump 1-1 and a right-side bump 1-2 are transversely arranged on the valve body 1, six runner ports are respectively arranged on the left-side bump 1-1 and the right-side bump 1-2, two runner ports are respectively arranged in front of the left-side bump 1-1 and the right-side bump 1-2, and one runner port is arranged behind the right-side bump 1-2; thirteen runner ports are arranged in front of the valve body 1; ten runner ports are arranged at the back of the valve body 1; two longitudinal runners are arranged on the left side bump 1-1, namely an upper longitudinal runner 2 and an upper two longitudinal runners 3 respectively, three longitudinal runners are arranged on the right side bump 1-2, namely an upper three longitudinal runners 4, an upper four longitudinal runner 5 and an upper five longitudinal runner 22 respectively, and the upper four longitudinal runners 5 and the upper five longitudinal runners 22 are arranged in front of and behind each other; the upper longitudinal flow passage 2 and the upper two longitudinal flow passages 3 are respectively communicated with two flow passage ports in front of the left bump 1-1 in a one-to-one correspondence manner, the front ends of the upper three longitudinal flow passages 4 and the upper two four longitudinal flow passages 5 are communicated with two flow passage ports in front of the right bump 1-2 in a corresponding manner, and the rear ends of the upper five longitudinal flow passages 22 are corresponding to one flow passage port behind the right bump 1-2; sixteen longitudinal flow passages are arranged in the valve body 1; the six longitudinal flow channels are positioned at the upper part of the valve body and are horizontally arranged, from left to right, a first longitudinal flow channel 6, a second longitudinal flow channel 7, a third longitudinal flow channel 8, a fourth longitudinal flow channel 9, a fifth longitudinal flow channel 10 and a sixth longitudinal flow channel 11 are sequentially arranged, the front ends of the first longitudinal flow channel 6, the second longitudinal flow channel 7, the third longitudinal flow channel 8, the fourth longitudinal flow channel 9, the fifth longitudinal flow channel 10 and the sixth longitudinal flow channel 11 are respectively communicated with six flow channel openings in front of the valve body 1 in a one-to-one correspondence manner, the rear ends of the second longitudinal flow channel 7, the third longitudinal flow channel 8, the fourth longitudinal flow channel 9 and the fifth longitudinal flow channel 10 are respectively communicated with four flow channel openings in back of the valve body 1, the eight longitudinal flow channels are positioned at the middle part of the valve body and are a seventh longitudinal flow channel 12, an eighth longitudinal flow channel 13, a ninth longitudinal flow channel 14, a tenth longitudinal flow channel 15, A thirteenth longitudinal flow passage 18 and a fourteenth longitudinal flow passage 19, the seventh longitudinal flow passage 12 is located below the first longitudinal flow passage 7, the front end of the seventh longitudinal flow passage 12 is communicated with a flow passage opening in front of the valve body 1, the rear end of the seventh longitudinal flow passage 12 is communicated with a flow passage opening in back of the valve body 1, the eighth longitudinal flow passage 13 is located below the second longitudinal flow passage 8, the rear end of the eighth longitudinal flow passage 13 is communicated with a flow passage opening in back of the valve body 1, the ninth longitudinal flow passage 14 and the tenth longitudinal flow passage 15 are located below the third longitudinal flow passage 9, the front end of the ninth longitudinal flow passage 14 is communicated with a flow passage opening in front of the valve body 1, the rear end of the tenth longitudinal flow passage 15 is communicated with a flow passage opening in back of the valve body 1, the eleventh longitudinal flow passage 16 and the twelfth longitudinal flow passage 17 are located below the fourth longitudinal flow passage 10, the front end and back, the front end of the eleventh longitudinal flow passage 16 is communicated with a flow passage opening in front of, the rear end of the twelfth longitudinal flow passage 17 is communicated with a flow passage opening at the rear of the valve body 1, the thirteenth longitudinal flow passage 18 is positioned below the fifth longitudinal flow passage 11, the front end of the thirteenth longitudinal flow passage 18 is communicated with a flow passage opening at the front of the valve body 1, the rear end of the thirteenth longitudinal flow passage 18 is communicated with a flow passage opening at the rear of the valve body 1, the fourteenth longitudinal flow passage 19 is positioned below the sixth longitudinal flow passage 12, the front end of the fourteenth longitudinal flow passage 19 is communicated with a flow passage opening at the front of the valve body, and the rear end of the fourteenth longitudinal flow passage 19 is communicated with a flow passage opening at the rear of the valve body; the two longitudinal flow passages are positioned at the lower part of the valve body and are a fifteenth longitudinal flow passage 20 and a sixteenth longitudinal flow passage 21, the fifteenth longitudinal flow passage 20 is positioned between the third longitudinal flow passage 8 and the fourth longitudinal flow passage 9, the front end of the fifteenth longitudinal flow passage 20 is communicated with a flow passage opening in front of the valve body 1, the fifteenth longitudinal flow passage 20 is positioned between the fourth longitudinal flow passage 9 and the fifth longitudinal flow passage 10, and the front end of the sixteenth longitudinal flow passage 21 is communicated with a flow passage opening in front of the valve body 1; twelve vertical flow channels are arranged in the valve body and divided into a front row and a rear row, the upper ends of the left six vertical flow channels extend into the left convex block and are communicated with the six flow channel openings on the left convex block in a one-to-one correspondence manner, and the upper ends of the right six vertical flow channels extend into the right convex block and are communicated with the six flow channel openings on the right convex block in a one-to-one correspondence manner; the vertical flow channel and the longitudinal flow channel are connected with the auxiliary flow channel through the annular groove in a matched mode.

The sand burying molding die of the main control valve body used by the engineering machinery comprises a sand box and a sand core, wherein the sand core is arranged in the sand box, a cavity is formed between the sand core and the sand box, and two risers and a pouring gate are arranged on the sand box; the sand box is characterized in that the sand box is formed by compacting iron ore sand mixed with resin sand; the riser is a phi 120 x 150 high-heating necking riser, and the diameter of the riser neck is 60 mm; the mud core is made of Jinying B570US magnetite sand, the mud core is formed by assembling a plurality of core bars, the assembling clearance of the mud core reaches 0.1mm, one core bar is a main core bar forming a main hole of the valve body, the main core bar is a phi 18 hollow tube, and the side surface of the mud core is perforated; the gate is a side gate.

Because of the limited character expression, there exist practically unlimited specific structures, and it will be apparent to those skilled in the art that a number of improvements, decorations, or changes may be made without departing from the principles of the present invention, or the above technical features may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.

Claims (3)

1. The utility model provides a main control valve body that engineering machine tool used which characterized in that: the valve comprises a valve body, wherein the valve body is designed into a square block shape, two convex blocks are transversely arranged on the valve body, six channel openings are respectively arranged on the two convex blocks, two channel openings are respectively arranged in front of the two convex blocks, and a channel opening is arranged behind the right convex block; thirteen runner ports are arranged in front of the valve body; ten runner ports are arranged at the back of the valve body;

two longitudinal runners are arranged on the left side lug, namely an upper longitudinal runner and an upper two longitudinal runners respectively, three longitudinal runners are arranged on the right side lug, namely an upper three longitudinal runners, an upper four longitudinal runner and an upper five longitudinal runner respectively, and the upper four longitudinal runners and the upper five longitudinal runners are arranged in front of each other; the front ends of the upper three longitudinal flow channels and the upper four longitudinal flow channels are communicated with the two flow channel openings in front of the right bump correspondingly, and the rear ends of the upper five longitudinal flow channels are corresponding to one flow channel opening in back of the right bump;

sixteen longitudinal flow passages are arranged in the valve body; the six longitudinal flow channels are positioned at the upper part of the valve body and are horizontally arranged, the front ends of the first longitudinal flow channel, the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel, the fifth longitudinal flow channel and the sixth longitudinal flow channel are sequentially arranged from left to right, the front ends of the first longitudinal flow channel, the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel, the fifth longitudinal flow channel and the sixth longitudinal flow channel are respectively communicated with six flow channel openings in the front of the valve body in a one-to-one correspondence manner, the rear ends of the second longitudinal flow channel, the third longitudinal flow channel, the fourth longitudinal flow channel and the fifth longitudinal flow channel are respectively communicated with four flow channel openings in the rear of the valve body, the eight longitudinal flow channels are positioned in the middle of the valve body and are a seventh longitudinal flow channel, an eighth longitudinal flow channel, a ninth longitudinal flow channel, a tenth longitudinal flow channel, an eleventh longitudinal flow channel, a twelfth longitudinal flow channel, a thirteenth longitudinal, the front end of the seventh longitudinal flow passage is communicated with a flow passage opening in the front of the valve body, the rear end of the seventh longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the eighth longitudinal flow passage is positioned below the second longitudinal flow passage, the rear end of the eighth longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the ninth longitudinal flow passage and the tenth longitudinal flow passage are positioned below the third longitudinal flow passage, the front end of the ninth longitudinal flow passage is communicated with a flow passage opening in the front of the valve body after one in front of the first longitudinal flow passage, the rear end of the tenth longitudinal flow passage is communicated with a flow passage opening in the rear of the valve body, the eleventh longitudinal flow passage and the twelfth longitudinal flow passage are positioned below the fourth longitudinal flow passage, the front end of the eleventh longitudinal flow passage is communicated with a flow passage opening in the front of the valve body after one in front of the first longitudinal flow passage, the rear end of the twelfth longitudinal flow passage is communicated with a flow passage, the rear end of the thirteenth longitudinal flow passage is communicated with a flow passage opening at the back of the valve body, the fourteenth longitudinal flow passage is positioned below the sixth longitudinal flow passage, the front end of the fourteenth longitudinal flow passage is communicated with a flow passage opening at the front of the valve body, and the rear end of the fourteenth longitudinal flow passage is communicated with a flow passage opening at the back of the valve body; the two longitudinal flow channels are positioned at the lower part of the valve body and are a fifteenth longitudinal flow channel and a sixteenth longitudinal flow channel, the fifteenth longitudinal flow channel is positioned between the third longitudinal flow channel and the fourth longitudinal flow channel, the front end of the fifteenth longitudinal flow channel is communicated with a flow channel opening in front of the valve body, the fifteenth longitudinal flow channel is positioned between the fourth longitudinal flow channel and the fifth longitudinal flow channel, and the front end of the sixteenth longitudinal flow channel is communicated with a flow channel opening in front of the valve body;

twelve vertical flow channels are arranged in the valve body and divided into a front row and a rear row, the upper ends of the left six vertical flow channels extend into the left convex block and are communicated with the six flow channel openings on the left convex block in a one-to-one correspondence manner, and the upper ends of the right six vertical flow channels extend into the right convex block and are communicated with the six flow channel openings on the right convex block in a one-to-one correspondence manner;

the vertical flow channel and the longitudinal flow channel are connected with the auxiliary flow channel through the annular groove in a matched mode.

2. The main control valve body for the construction machine according to claim 1, wherein the valve body has the following technical parameters: QT 500-7; the tensile strength of the body is as follows: not less than 500 MPa; yield strength: not less than 320 MPa; HB hardness: 180-230; spheroidization grade: 1-3 grade; the metallographic structure should meet the evaluation of GB/T9441-2009; graphite size grade: 6-8 grades; no slag inclusion, pores, shrinkage cavities and shrinkage porosity; the weight of the valve body is as follows: 87.7 KG.

3. A sand burying molding die for casting a main control valve body used in the engineering machinery as claimed in claim 2, comprising a sand box and a sand core, wherein the sand core is arranged in the sand box, a cavity is formed between the sand core and the sand box, and two risers and gates are arranged on the sand box; the sand box is characterized in that the sand box is formed by compacting iron ore sand mixed with resin sand; the riser is a phi 120 x 150 high-heating necking riser, and the diameter of the riser neck is 60 mm; the mud core is made of Jinying B570US magnetite sand, the mud core is formed by assembling a plurality of core bars, the assembling clearance of the mud core reaches 0.1mm, one core bar is a main core bar forming a main hole of the valve body, the main core bar is a phi 18 hollow tube, and the side surface of the mud core is perforated; the gate is a side gate.

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