1. The excavator control valve body casting is characterized by comprising a main body, a main runner, a first runner, a second runner, a third runner, a fourth runner, a fifth runner, a sixth runner, a seventh runner, an eighth runner and a ninth runner, wherein the main body is an integrally cast iron block, the main body is internally provided with the main runner, the main runner is communicated with the front end face and the rear end face of the main body in a front-rear mode, the main body is internally provided with the three runners which are positioned on the right side of the main runner, the three runners are respectively the first runner, the second runner and the third runner, the three runners are designed in parallel and perpendicular to the main runner, the openings of the three runners are communicated with the right end face of the main body, and the end part of the inner side of the second runner is communicated with the end part of the inner side of the third runner through a first auxiliary runner; a fourth flow channel is vertically designed on the upper side of the main flow channel, the end part of the inner side of the fourth flow channel is communicated with the main flow channel, and the opening of the fourth flow channel is communicated with the upper side end face of the main body; a fifth flow channel is further designed above the main flow channel, the fourth flow channel is parallel to the fifth flow channel, and the end part of the inner side of the fifth flow channel is communicated with the middle position of the second flow channel through a second auxiliary flow channel; a sixth flow channel is vertically designed below the first flow channel, and the end part of the inner side of the sixth flow channel is communicated with the middle position of the first flow channel; a seventh flow channel is vertically designed below the third flow channel, and the inner end part of the seventh flow channel is communicated with the inner end part of the third flow channel; an eighth flow channel and a ninth flow channel are vertically designed below the main flow channel and close to the two ends of the main flow channel respectively, and the inner side ends of the eighth flow channel and the ninth flow channel are communicated with the main flow channel; the mouths of the sixth flow passage, the seventh flow passage, the eighth flow passage and the ninth flow passage are communicated with the lower side end surface of the main body.

2. The excavator control valve body casting of claim 1 wherein the front and rear of the main flow passage are respectively communicated with the front and rear end faces through a circular passage.

3. The excavator control valve body casting of claim 1 wherein the first flow passage, the second flow passage, the third flow passage, the fourth flow passage, the fifth flow passage, the sixth flow passage and the seventh flow passage are all circular passages.

4. The excavator control valve body casting of claim 1 wherein the eighth flow passage and the ninth flow passage are rectangular passages or oval passages.

5. The excavator control valve body casting of claim 1 wherein the first flow passage is provided with an annular groove at a middle position, and the first flow passage is communicated with the sixth flow passage through the annular groove; an annular groove is formed in the end portion of the inner side of the third flow channel, and the third flow channel is communicated with the seventh flow channel through the annular groove; annular grooves are respectively designed at the middle position and the inner side end of the second flow channel, annular grooves are respectively designed at the inner side end of the third flow channel and the inner side end of the fifth flow channel, one end of the first auxiliary flow channel is connected with the annular groove at the inner side end of the second flow channel, the other end of the first auxiliary flow channel is connected with the annular groove at the inner side end of the third flow channel, one end of the second auxiliary flow channel is connected with the annular groove at the middle position of the second flow channel, and the other end of the second auxiliary flow channel is connected with the annular groove at the inner side end of the fifth flow channel.

6. The excavator control valve body casting of claim 1 wherein the main flow passage is a rectangular body, the upper side of the main flow passage near the rear end position is designed with a first rectangular-shaped groove, the right side of the main flow passage near the rear end position and the right side of the middle and rear positions of the first rectangular-shaped groove are designed with a second rectangular-shaped groove, and the left side of the main flow passage near the rear end position and the left side of the middle and rear positions of the first rectangular-shaped groove are designed with a third rectangular-shaped groove; the right side of the main runner close to the front end is provided with two layers of stepped grooves, and the right side of the two layers of stepped grooves is also provided with a triangular groove; the left side of the main runner, which is close to the middle position, is designed with an arc-shaped bulge.

7. The excavator control valve body casting of claim 5 wherein the first auxiliary flow passage is connected to the annular recess at the inboard end of the second flow passage by a further slot projecting rearwardly therefrom.

8. The valve body casting of the excavator control valve according to any one of claims 1 to 7, wherein in the production process of the valve body casting of the excavator control valve, a cavity in a sand box is manufactured according to the appearance of a product, a main runner large sand core and other runner small sand cores are designed according to the runner structure of the product, then the main runner large sand core and the other runner small sand cores are appointed to be placed in the cavity of the sand box, the sand box is closed, molten iron is poured into the sand box from a reserved casting head, after cooling, the sand box is opened, the valve body casting is taken out, the inner sand cores are cleaned and led out, and processing is finished;

the small sand core adopts a 4mm core rod to be placed in a sand core hole with the diameter of 9.5mm so as to enhance the strength of the sand core, and a core support is added above the small sand core to support the small sand core, so that the core rod and the core support jointly act on the small sand core to reduce the deformation;

the large sand core of the main runner exhausts in a multi-position drilling mode, so that gas in the sand core is exhausted in the drilled hole, and the defect of air holes of a casting is avoided; drilling holes in the axis direction of circular channels at the front end and the rear end of the main runner large core, wherein the drilling depth is one third of the length of the main runner large core; and drilling holes in the axis directions of the small cores of the fourth flow passage, the eighth flow passage and the ninth flow passage, wherein the depth of the drilled holes is less than the maximum thickness of the main flow passage at the position of the large core of the main flow passage in the axial vertical direction.

Background

The excavator control valve body casting is a hydraulic valve body casting which is autonomously developed according to the requirements and market requirements of the carter mechanical parts limited company and is applied to the excavator control valve. At present, the manufacturing industry of domestic engineering machinery is large and weak, the capacity of middle and low-grade products is excessive, high-grade hydraulic elements almost depend on import, the development of the hydraulic industry is seriously lagged behind the development of the main machine industry, and the hydraulic element becomes a main bottleneck restricting the development of the equipment manufacturing industry. At present, the overall manufacturing technical level of the hydraulic part industry still has a large gap compared with the international advanced countries. In order to change the situation that domestic similar castings are poor in precision and low in technical content, the excavator control valve body casting product is used as a key part in a hydraulic system, and how to produce, cast and process the excavator control valve body casting which is high in integration level, strong in reliability and long in service life and meets the requirements of domestic high-end hydraulic valve users is a great problem at present.

Disclosure of Invention

In order to solve the technical problems, the invention provides a control valve body casting of an excavator, which is reasonable in design, compact in structure, high in integration level, strong in reliability and long in service life.

The technical scheme of the invention is as follows:

the main body is an integrally cast iron block, the main body is internally provided with the main channel, the main channel is communicated with the front end face and the rear end face of the main body, three channels are further designed in the main body and positioned on the right side of the main channel, the three channels are respectively a first channel, a second channel and a third channel, the three channels are designed in parallel and perpendicular to the main channel, the openings of the three channels are communicated with the end face of the right side of the main body, and the end part of the inner side of the second channel is communicated with the end part of the inner side of the third channel through a first auxiliary channel; a fourth flow channel is vertically designed on the upper side of the main flow channel, the end part of the inner side of the fourth flow channel is communicated with the main flow channel, and the opening of the fourth flow channel is communicated with the upper side end face of the main body; a fifth flow channel is further designed above the main flow channel, the fourth flow channel is parallel to the fifth flow channel, and the end part of the inner side of the fifth flow channel is communicated with the middle position of the second flow channel through a second auxiliary flow channel; a sixth flow channel is vertically designed below the first flow channel, and the end part of the inner side of the sixth flow channel is communicated with the middle position of the first flow channel; a seventh flow channel is vertically designed below the third flow channel, and the inner end part of the seventh flow channel is communicated with the inner end part of the third flow channel; an eighth flow channel and a ninth flow channel are vertically designed below the main flow channel and close to the two ends of the main flow channel respectively, and the inner side ends of the eighth flow channel and the ninth flow channel are communicated with the main flow channel; the mouths of the sixth flow passage, the seventh flow passage, the eighth flow passage and the ninth flow passage are communicated with the lower side end surface of the main body.

The front and the back of the main flow channel are respectively communicated with the front and the back end surfaces through a circular channel.

The first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the fifth flow channel, the sixth flow channel and the seventh flow channel are all circular channels.

The eighth flow channel and the ninth flow channel are rectangular channels or oval channels.

An annular groove is formed in the middle of the first flow channel, and the first flow channel is communicated with the sixth flow channel through the annular groove; an annular groove is formed in the end portion of the inner side of the third flow channel, and the third flow channel is communicated with the seventh flow channel through the annular groove; annular grooves are respectively designed at the middle position and the inner side end of the second flow channel, annular grooves are respectively designed at the inner side end of the third flow channel and the inner side end of the fifth flow channel, one end of the first auxiliary flow channel is connected with the annular groove at the inner side end of the second flow channel, the other end of the first auxiliary flow channel is connected with the annular groove at the inner side end of the third flow channel, one end of the second auxiliary flow channel is connected with the annular groove at the middle position of the second flow channel, and the other end of the second auxiliary flow channel is connected with the annular groove at the inner side end of the fifth flow channel.

The main runner is a rectangular body, a first rectangular groove is designed on the upper side of the main runner close to the rear end position, a second rectangular groove is designed on the right side of the main runner close to the rear end position and the right side of the middle and rear positions of the first rectangular groove, and a third rectangular groove is designed on the left side of the main runner close to the rear end position and the left side of the middle and rear positions of the first rectangular groove; the right side of the main runner close to the front end is provided with two layers of stepped grooves, and the right side of the two layers of stepped grooves is also provided with a triangular groove; the left side of the main runner, which is close to the middle position, is designed with an arc-shaped bulge.

The first auxiliary flow passage is connected with the annular groove at the end part of the inner side of the second flow passage, and a section of groove protruding towards the rear end is further arranged.

The invention has the advantages of reasonable design, compact structure, high integration level, strong reliability and long service life, can replace an inlet and can also be used for an outlet.

Drawings

Fig. 1 is a first perspective view of the present invention.

Fig. 2 is a perspective view two of the present invention.

Fig. 3 is a perspective view three of the present invention.

Fig. 4 is a perspective view four of the present invention.

FIG. 5 is a top cross-sectional view of the first, second, and third flow channel locations of FIG. 1.

Fig. 6 is a side sectional view at the primary flow passage in fig. 5.

Fig. 7 is a side sectional view of the sixth flow passage and the seventh flow passage in fig. 5.

Fig. 8 is a front sectional view at the first flow passage in fig. 5.

Fig. 9 is a front sectional view at the second flow passage in fig. 5.

Fig. 10 is a front sectional view at the third flow channel of fig. 5.

Fig. 11 is a front sectional view at an eighth flow passage of fig. 5.

Fig. 12 is a first schematic view of a loaf core of the present invention.

Fig. 13 is a second schematic view of a loaf core of the invention.

Fig. 14 is a third schematic view of a loaf core of the present invention.

Fig. 15 is a fourth schematic view of a loaf core of the present invention.

Detailed Description

Referring to fig. 1-11, the valve body casting of the control valve of the excavator comprises a main body 1, a main flow passage 2, a first flow passage 3, a second flow passage 4, a third flow passage 5 and a fourth flow passage 6, the main body 1 is an integrally cast iron block, a main runner 2 is designed inside the main body 1, the main runner 2 is communicated with the front end face and the rear end face of the main body 1 in a front-rear mode, three runners are further designed in the main body 1 and located on the right side of the main runner 2, the three runners are respectively a first runner 3, a second runner 4 and a third runner 5, the three runners are designed in parallel and perpendicular to the main runner 2, the openings of the three runners are communicated with the right end face of the main body 1, and the end portion of the inner side of the second runner 4 is communicated with the end portion of the inner side of the third runner 5 through a first auxiliary runner 12; a fourth flow channel 6 is vertically arranged on the upper side of the main flow channel 2, the end part of the inner side of the fourth flow channel 6 is communicated with the main flow channel 2, and the opening part of the fourth flow channel 6 is communicated with the end surface of the upper side of the main body 1; a fifth flow channel 7 is further designed above the main flow channel 2, the fourth flow channel 6 is parallel to the fifth flow channel 7, and the end part of the inner side of the fifth flow channel 7 is communicated with the middle position of the second flow channel 4 through a second auxiliary flow channel 13; a sixth flow passage 8 is vertically arranged below the first flow passage 3, and the end part of the inner side of the sixth flow passage 8 is communicated with the middle position of the first flow passage 3; a seventh flow channel 9 is vertically arranged below the third flow channel 5, and the inner end part of the seventh flow channel 9 is communicated with the inner end part of the third flow channel 5; an eighth flow channel 10 and a ninth flow channel 11 are vertically arranged below the main flow channel 2 and close to the two ends of the main flow channel, and the inner side ends of the eighth flow channel 10 and the ninth flow channel 11 are communicated with the main flow channel 2; the mouths of the sixth flow passage 8, the seventh flow passage 9, the eighth flow passage 10 and the ninth flow passage 11 are communicated with the lower end surface of the main body 1.

The front and the back of the main flow channel 2 are respectively communicated with the front and the back end surfaces through circular channels.

The first flow passage 3, the second flow passage 4, the third flow passage 5, the fourth flow passage 6, the fifth flow passage 7, the sixth flow passage 8 and the seventh flow passage 9 are all circular passages.

The eighth flow passage 10 and the ninth flow passage 11 are rectangular passages or oval passages.

An annular groove 14 is formed in the middle of the first flow passage 3, and the first flow passage 3 is communicated with the sixth flow passage 8 through the annular groove 14; an annular groove 14 is designed at the end part of the inner side of the third flow passage 5, and the third flow passage 5 is communicated with the seventh flow passage 9 through the annular groove 14; annular grooves 14 are respectively designed at the middle position and the inner side end of the second flow passage 4, annular grooves 14 are respectively designed at the inner side end of the third flow passage 5 and the inner side end of the fifth flow passage 7, one end of the first auxiliary flow passage 12 is connected with the annular groove 14 at the inner side end of the second flow passage 4, the other end of the first auxiliary flow passage 12 is connected with the annular groove 14 at the inner side end of the third flow passage 5, one end of the second auxiliary flow passage 13 is connected with the annular groove 14 at the middle position of the second flow passage 4, and the other end of the second auxiliary flow passage 13 is connected with the annular groove 14 at the inner side end of the fifth flow passage 7.

The main runner 2 is a rectangular body, a first rectangular groove 16 is designed on the upper side of the main runner 2 close to the rear end position, a second rectangular groove 17 is designed on the right side of the main runner 2 close to the rear end position and on the right side of the middle and rear positions of the first rectangular groove 16, and a third rectangular groove 18 is designed on the left side of the main runner 2 close to the rear end position and on the left side of the middle and rear positions of the first rectangular groove 16; a two-layer stepped groove 19 is designed on the right side of the main runner 2 close to the front end, and a triangular groove 20 is also designed on the right side of the two-layer stepped groove 19; the left side of the main channel 2 near the middle position is designed with an arc-shaped protrusion 15.

The first auxiliary flow passage 12 is connected to the annular groove 14 at the inner end of the second flow passage 4, and has a groove protruding toward the rear end.

In the production process of the product, the thick loam core of the main runner 2 is large, the small loam cores of the rest runners are small and insufficient in support, the loam core is easy to bend and deform after pouring, and the thick loam core is easy to generate gas in the pouring process to cause air holes on the upper surface.

Referring to the attached drawings 12-15, in the production process of the valve body casting, a cavity in a sand box is manufactured according to the appearance of a product, a main runner large sand core 21 and other runner small sand cores 22 are designed according to the runner structure of the product, then the main runner large sand core 21 and other runner small sand cores 22 are appointed to be placed in the cavity of the sand box, the sand box is closed, molten iron is poured in from a reserved casting head, after cooling, the sand box is opened, the valve body casting is taken out, the inner sand cores are cleaned and led out, and processing is finished. Wherein the oil duct is deformed: the small sand core 22 of the invention adopts a 4mm core rod to be placed in a sand core hole with the diameter of 9.5mm so as to enhance the strength of the sand core, and a core support is added above the small sand core to support the small sand core, so that the core rod and the core support jointly act on the small sand core to reduce the deformation. For air hole defects: the main runner large core sand 21 is exhausted in a multi-position drilling mode, so that gas in the core sand can be exhausted in drilled holes, and the defect of air holes of castings is avoided. Drilling 23 in the axis direction of circular channels at the front end and the rear end of the main runner large core 21, wherein the drilling depth is one third of the length of the main runner large core; and drilling holes 23 in the axial direction of the small cores of the fourth flow passage, the eighth flow passage and the ninth flow passage, wherein the depth of the drilled holes is less than the maximum thickness of the main flow passage at the position of the large core of the main flow passage in the axial vertical direction.

The main technical parameters of the valve body casting are as follows:

1) and material quality: QT 550.

2) Tensile strength (single cast test bar): more than or equal to 550 MPa.

3) And Brinell hardness: 187 and 255 HBW.

4) And spheroidization grade: grade 3 or more.

5) The metallographic structure of the alloy material meets the evaluation of GB/T9441-2009.

6) And the casting defects of slag inclusion, pores, shrinkage cavity, shrinkage porosity and the like are avoided.

7) And the weight of the valve body: 15.5 kg.