CN211248233U

CN211248233U - Sand box for thick-section wind power main shaft casting

Info

Publication number: CN211248233U
Application number: CN201922105845.8U
Authority: CN
Inventors: 武耐寒; 韦旭; 王强; 王卫国; 季虎; 占进
Original assignee: Jiangsu Jixin Wind Energy Technology Co Ltd
Current assignee: Jiangsu Jixin Wind Energy Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-08-14
Anticipated expiration: 2029-11-29

Abstract

The utility model relates to a thick section wind-powered electricity generation main shaft foundry goods sand box belongs to sand box technical field. The main shaft casting copying cavity is formed by an inner cavity formed by the involutory cover box and the involutory bottom box; the structure of the bottom box is the same as that of the cover box, a plurality of bolt holes are respectively formed in the edges of the bottom box and the cover box at equal intervals, and bolts are respectively penetrated in the bolt holes; the bottom box and the cover box are respectively provided with a reinforcing rib component, and the two reinforcing rib components are fixedly connected; the bottom box and the cover box respectively comprise a first box body and a second box body, and the first box body and the second box body are fixedly connected through a transition box body. The method and the device not only reduce the risk of box leakage, reduce economic loss and reduce the safety of operating personnel; but also enhances the integral rigidity to resist the expansion force caused by graphitized expansion in the solidification process of the casting, reduces the usage amount of sand mud and reduces the production cost.

Description

Sand box for thick-section wind power main shaft casting

Technical Field

The utility model relates to a thick section wind-powered electricity generation main shaft foundry goods sand box belongs to sand box technical field.

Background

Wind power generation has developed rapidly in recent years, and the corresponding size of the fan assembly has also increased with the substantial increase in fan power. The main shaft is used as an important transmission part in the fan assembly, and is manufactured by forging in the traditional way because of bearing dynamic load all the year round, but the forging method is low in yield and long in processing period, and the price of the main shaft of the forging piece is high for a long time due to the fact that the material per se is high in unit price. Under the coming large background of 'wind and fire equivalent', in order to reduce the cost of the fan, a plurality of host manufacturers begin to choose a casting mode to manufacture the main shaft.

The 4MW series fan main shaft casting (as shown in figure 1) of our department is a large-tonnage and large-size casting main shaft, the contour dimension of the casting is about 2200 x 4080mm, the wall thickness of a finished product is 175-335 mm, the weight is about 19T, the box expansion force generated by graphitization expansion of a large section casting in the solidification process on a sand box is difficult to bear by the conventional sand box, and the conventional sand box has a large risk of box leakage due to more layers, so that economic loss is caused and the production safety risk of a pouring operator is increased. Meanwhile, due to the fact that the difference between the upper diameter and the lower diameter of the main shaft flange and the shaft body is large, the sizes of the inner frames of the upper box and the lower box in the traditional sand box design are generally the same, most of sand mud, resin and curing agents above the main shaft flange are wasted, and production cost is increased.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a sand box for a wind power main shaft casting with a thick section aiming at the prior art, which not only has the following design, saves the sand dosage, reduces the production cost, but also increases the rigidity to resist the expansion force of the casting caused by graphitization expansion in the solidification process; the leakproofness of the joint surface is enhanced, the risk of leaking boxes is reduced, the economic loss is reduced, and the safety of operating personnel is reduced.

The utility model provides a technical scheme that above-mentioned problem adopted does: a wind power main shaft casting sand box with a thick section comprises a bottom box and a cover box, wherein the cover box and the bottom box are arranged in a matched mode, and an inner cavity formed by the matched cover box and the bottom box forms a main shaft casting profiling cavity; the structure of the bottom box is the same as that of the cover box, a plurality of bolt holes are respectively formed in the edges of the bottom box and the cover box at uniform intervals, and bolts are respectively penetrated in the bolt holes to realize the fixed connection of the cover box and the bottom box; the bottom box and the cover box are respectively provided with a crossed reinforcing rib component, and the two reinforcing rib components are fixedly connected to strengthen the connection strength of the bottom box and the cover box; the bottom box and the cover box respectively comprise a first box body and a second box body, the height of the first box body is higher than that of the second box body, and the first box body and the second box body are fixedly connected through a transition box body.

The second box body is provided with a vertical plate, so that the second box body and the first box body are kept in a horizontal state.

The bottom box and the cover box are respectively provided with a box blocking unit, so that the rigidity of the bottom box and the cover box is enhanced, and the use amount of sand mud is reduced.

The box keeps off the unit and keeps off including first case fender and second case, first case keeps off and is fixed in the first box, the second case keeps off and locates in the second box, the internal oblique case that is equipped with of transition box keeps off, and first case fender and second case fender are connected respectively to oblique case fender both ends.

The inclined box baffles are arranged in the transition box body in parallel.

The inclined angle of the inclined box baffle is 35-45 degrees.

And the outside flanges of the bottom box and the cover box are inwards inclined and tightened.

The distance between the top surface of the first box stop and the outer diameter of the main shaft flange casting is 180-210 mm.

Compared with the prior art, the utility model has the advantages of: the utility model provides a thick section wind-powered electricity generation main shaft foundry goods sand box, is through bolted connection through the bottom box and the lid case of the looks isostructure to the combination for bottom box and lid case fixed connection have reduced the hourglass case risk, reduce economic loss and reduce operation personnel's security. Through setting up case fender unit and slope turn-ups, reinforcing bulk rigidity is in order to resist the bulging case power that the foundry goods arouses because of the graphitization inflation in the solidification process, has reduced sand mud use amount, reduction in production cost.

Drawings

Fig. 1 is a schematic view of a sand box for a thick-section wind power main shaft casting according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a bottom box in a thick-section wind power main shaft casting sand box according to an embodiment of the present invention;

fig. 3 is a sectional view of a sand box for a thick-section wind power main shaft casting according to an embodiment of the present invention;

in the figure, 1 a bottom box, 2 a cover box, 3 reinforcing rib members, 4 small inclined ribs, 5 bolt holes, 6 vertical plates, 7 large inclined ribs, 8 first box baffles, 9 inclined box baffles, 10 second box baffles, 11 spindle flanges and 12 spindle bodies.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 and 2, the sand box for the wind power main shaft casting with the thick section in the embodiment includes a bottom box 1 and a cover box 2, the cover box 2 is arranged in a matching manner with the bottom box 1, and an inner cavity formed by matching the cover box 2 and the bottom box 1 forms a main shaft casting profiling cavity. The structure of under casing 1 is the same with lid case 2, and a plurality of bolt holes 5 that even interval set up are equallyd divide respectively to the border of under casing 1 and lid case 2, wear to establish the bolt respectively in the bolt hole 5 of under casing 1 and lid case 2 longitudinal symmetry, realize lid case 2 and under casing 1 fixed connection. Equally divide the strengthening rib component 3 that do not set up the span on under casing 1 and

lid case

2, 3 both ends of strengthening rib component surpass under casing 1 and lid case 2 and surpass length and be 200mm, bolt hole 5 is seted up respectively at the both ends of strengthening rib component 3, wear to establish the bolt in the bolt hole 5 that two strengthening rib components 3 correspond and set up, set up little tilted reinforcement 4 in 3 sides of strengthening rib component, realize 3 fixed connection of two strengthening rib components, further strengthen under casing 1 and lid case 2's joint strength, reduce the box leakage risk, prevent that the molten iron from spilling from the sand box, economic loss and the security that has reduced the operation personnel.

As shown in fig. 3, because the difference between the upper and lower diameters of the main shaft flange 11 and the shaft body 12 is large, the bottom case 1 and the cover case 2 respectively comprise a first case body and a second case body, the height of the first case body is higher than that of the second case body, and the first case body and the second case body are fixedly connected through a transition case body. The use of sand mud, resin and curing agent is reduced, and the production cost is reduced.

Because the bottoms of the first box body and the second box body are not positioned on the same straight line, the phenomenon of toppling can occur when the box bodies are horizontally placed. Therefore, the vertical plate 6 is fixed on the second box body, so that the second box body and the first box body are kept in a horizontal state, and the pouring basin is convenient to support after turning over and erect before pouring. Big inclined ribs 7 are arranged on the vertical plate 6 and the second box body, so that the rigidity of the joint of the second box body and the vertical plate 6 is enhanced.

As shown in fig. 3, a bottom case 1 and a cover case 2 are respectively provided therein with a case stop unit. The box keeps off the unit and keeps off 10 including first box fender 8 and second box, and first box fender 8 is fixed in the first box, and second box fender 10 is located in the second box, and the interior parallel of transition box is equipped with the oblique box fender 9 that inclination is 40, and first box fender 8 and second box fender 10 are connected respectively to the box fender 9 both ends that just inclines for the top that the box kept off is 200mm with the interval of foundry goods external diameter. The flanging at the two outer sides of the bottom box 1 and the cover box 2 are inwards inclined and tightened, so that the inclination angle of the flanging is 70 degrees, the use amount of sand mud is reduced, and the production cost of castings is reduced.

This application is to combining through bolt-up connection through the under casing 1 and the lid case 2 of the looks isostructure for under casing 1 and lid case 2 fixed connection have reduced the leakage case risk, reduce economic loss and reduce operating personnel's security. Through setting up case fender unit and slope turn-ups, reinforcing bulk rigidity is in order to resist the bulging case power that the foundry goods arouses because of the graphitization inflation in the solidification process, has reduced sand mud use amount, reduction in production cost.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A wind power main shaft casting sand box with a thick section comprises a bottom box and a cover box, wherein the cover box and the bottom box are arranged in a matched mode, and an inner cavity formed by the matched cover box and the bottom box forms a main shaft casting profiling cavity; the method is characterized in that: the structure of the bottom box is the same as that of the cover box, a plurality of bolt holes are respectively formed in the edges of the bottom box and the cover box at uniform intervals, and bolts are respectively penetrated in the bolt holes to realize the fixed connection of the cover box and the bottom box; the bottom box and the cover box are respectively provided with a crossed reinforcing rib component, and the two reinforcing rib components are fixedly connected to strengthen the connection strength of the bottom box and the cover box; the bottom box and the cover box respectively comprise a first box body and a second box body, the height of the first box body is higher than that of the second box body, and the first box body and the second box body are fixedly connected through a transition box body.

2. The sand box for the thick-section wind power main shaft casting according to claim 1, wherein: the second box body is provided with a vertical plate, so that the second box body and the first box body are kept in a horizontal state.

3. The sand box for the thick-section wind power main shaft casting according to claim 1, wherein: and box baffle units are respectively arranged in the bottom box and the cover box, so that the rigidity of the bottom box and the rigidity of the cover box are enhanced.

4. The sand box for the thick-section wind power main shaft casting according to claim 3, wherein: the box keeps off the unit and keeps off including first case fender and second case, first case keeps off and is fixed in the first box, the second case keeps off and locates in the second box, the internal oblique case that is equipped with of transition box keeps off, and first case fender and second case fender are connected respectively to oblique case fender both ends.

5. The sand box for the thick-section wind power main shaft casting according to claim 4, wherein: the inclined box baffles are arranged in the transition box body in parallel.

6. The sand box for the thick-section wind power main shaft casting according to claim 5, wherein: the inclined angle of the inclined box baffle is 35-45 degrees.

7. The sand box for the thick-section wind power main shaft casting according to claim 1, wherein: and the outside flanges of the bottom box and the cover box are inwards inclined and tightened.

8. The sand box for the thick-section wind power main shaft casting according to claim 4, wherein: the distance between the top surface of the first box stop and the outer diameter of the main shaft flange casting is 180-210 mm.