Casting structure of rocker arm shell of double-motor barrel coal mining machine

Abstract

The invention provides a casting structure of a rocker arm shell of a double-motor-barrel coal mining machine, the rocker arm shell comprises a planet head, a water channel, a first motor barrel and a second motor barrel which are isolated from each other, a first connecting lug arranged close to the second motor barrel and a second connecting lug connected to the other end of the first connecting lug, the casting structure comprises a sand core body, the casting mold is used for casting to form a rocker shell; and the riser unit consists of a plurality of risers, and is at least arranged on the upper surface of the sand core body and corresponds to the rocker arm planet head, the separation position of the first motor cylinder and the second motor cylinder, the second connecting lug and the positions of the side edges of the second motor cylinder and the first connecting lug. Therefore, in the molten steel pouring process, shrinkage of molten metal in the casting process is compensated through the risers, the casting defects of looseness, shrinkage cavities, air holes and the like generated in a steel casting of the rocker arm shell of the large-scale double-motor-barrel coal mining machine, especially at a motor barrel separation structure, are overcome, the material density of the rocker arm shell is guaranteed, and the casting quality of the rocker arm shell is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal shearers, and in particular relates to a casting structure of a rocker arm housing of a dual-motor drum coal shearer. Background Art

[0002] Casting is the process of pouring molten metal into a mold and then cooling and solidifying it to obtain a part with the desired shape and performance. For the rocker arm housing of a dual-motor drum coal mining machine, the structure is large in size, and the largest hot spots in the rocker arm are concentrated at the roots of the two connecting ears and the two motor drum separation structures. Other hot spots are unevenly distributed in the rocker arm structure, and the difference in the hot spot modulus is relatively small. However, in existing casting structures or processes, casting defects such as porosity, shrinkage or cracks often occur in the hot spot area. These defects have a significant impact on casting quality, casting accuracy, casting cost and casting automation, and seriously affect the service life of the transition frame. Summary of the Invention

[0003] The purpose of the present invention is to address the shortcomings of the existing technology and provide a casting structure for the rocker arm housing of a dual-motor-drum coal mining machine, which solves the main casting defect problems such as looseness, shrinkage holes and cracks inside the cast steel parts of the complex structure of the rocker arm housing of the dual-motor-drum coal mining machine, especially in the motor barrel separation structure, and improves the casting quality of the rocker arm housing.

[0004] The present invention provides a casting structure of a rocker arm housing of a dual-motor barrel coal mining machine, wherein the rocker arm housing includes a planetary head, a water channel, a first motor barrel and a second motor barrel arranged in sequence and isolated from each other along the extension direction of the water channel, a first connecting ear arranged close to the second motor barrel, and a second connecting ear connected to the first connecting ear at the other end away from the second motor barrel. The casting structure includes: a sand core body for casting to form the rocker arm housing; a riser unit composed of a plurality of risers, which is arranged at least on the upper surface of the sand core body and corresponds to the rocker arm planetary head, the separation structure of the first motor barrel and the second motor barrel, the second connecting ear, and the side positions of the second motor barrel and the first connecting ear.

[0005] Preferably, the riser unit includes three first top risers and two second top risers arranged at the position of the upper surface of the sand core body corresponding to the planetary head, and are arranged at intervals on the corresponding areas of the upper surface of the sand core body. The cross-section of the first top riser is circular, with a diameter of 190-210mm and a height of 215-235mm; the cross-section of the second top riser is circular, with a diameter of 170-190mm and a height of 190-210mm.

[0006] Preferably, the riser unit further comprises a third top riser provided on the upper surface of the sand core body corresponding to the side area of ​​the second connecting ear; the cross section of the third top riser is circular, with a diameter of 340-360 mm and a height of 490-510 mm.

[0007] Preferably, the riser unit also includes a fourth top riser and a fifth top riser arranged on the upper surface of the sand core body and corresponding to the separation position of the first motor barrel and the second motor barrel, and are arranged at intervals along the depth direction of the separation; the cross-section of the fourth top riser is circular, with a diameter of 270-290mm and a height of 390-410mm; the cross-section of the fifth top riser is circular, with a diameter of 315-335mm and a height of 440-460mm.

[0008] Preferably, the third top riser is positioned by a riser seat; and / or, a motor barrel subsidy is further provided below the fourth top riser and the fifth top riser.

[0009] Preferably, the riser also includes two sixth top risers arranged on the upper surface of the sand core body and corresponding to the sides of the first connecting ear and the second motor barrel; the cross-section of the sixth top riser is circular, with a diameter of 215-235 mm and a height of 290-310 mm.

[0010] Preferably, the riser unit also includes three seventh top risers and one side riser arranged on the upper surface of the sand core body corresponding to the area where the water channel is located, and the side riser is arranged on the outer position close to one end of the planetary head; the seventh top riser is arranged on the inner and outer positions of both ends along the extension direction of the water channel; the cross-section of the seventh top riser is circular, with a diameter of 190-210mm and a height of 340-360mm; the cross-section of the side riser is elliptical, with dimensions of Y180x270x310mm.

[0011] Preferably, the casting structure further comprises: a plurality of chillers provided on the bottom and sides of the sand core body.

[0012] Preferably, the casting structure further comprises a pouring system,

[0013] The pouring system includes an inner gate arranged at the bottom of the planetary head section and the side positions of the first motor barrel and the second motor barrel to avoid any sand core structure of the sand core body.

[0014] Preferably, the pouring system includes an ingrown runner, a horizontal runner and a vertical runner, wherein the ingrown runner and the horizontal runner are perpendicular to each other, one end of the ingrown runner is connected to the horizontal runner or the vertical runner, and the other end is connected to the riser; the ingrown runner adopts four and / or, the ratio of the cross-sectional areas of the sprue, the runner and the ingrain is 1:1.2:1.5.

[0015] On the basis of conforming to the common sense in this field, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0016] The positive progress effect of the present invention is:

[0017] According to the casting structure of the rocker arm housing of the dual-motor barrel coal mining machine involved in the present invention, risers are respectively arranged on the upper surface of the sand core body corresponding to the rocker arm planetary head, the separation position of the first motor barrel and the second motor barrel, the second connecting ear, and the side positions of the second motor barrel and the first connecting ear. Therefore, during the molten steel pouring process, the risers can compensate for the shrinkage of the molten metal during the casting process, solve the casting defects such as looseness, shrinkage holes and air holes inside the cast steel parts of the rocker arm housing of the large dual-motor barrel coal mining machine, especially at the motor barrel separation structure, ensure the material density of the rocker arm housing, and improve the casting quality of the rocker arm housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the rocker arm housing of a dual-motor drum coal mining machine in an embodiment of the present invention.

[0019] Figure 2 It is a structural schematic diagram of one direction of the casting structure of the rocker arm housing of the dual-motor drum coal mining machine in an embodiment of the present invention after the casting is completed.

[0020] Figure 3 It is a structural schematic diagram of another direction of the casting structure of the rocker arm housing of the dual-motor drum coal mining machine in an embodiment of the present invention after the casting is completed.

[0021] Figure 4 It is a schematic diagram of the simulation state of the casting process of the casting structure of the rocker arm housing of the dual-motor drum coal mining machine in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0023] <Example>

[0024] like Figure 1 、 Figure 2 、 Figure 3 As shown, this embodiment discloses a casting structure of a rocker arm housing of a dual motor drum coal mining machine, which is used to cast the rocker arm housing 100 of the dual motor drum coal mining machine shown in the figure. Figure 1As shown, the rocker arm housing 100 includes a planetary head 101, a water channel 102, a first motor barrel 103 and a second motor barrel 104 arranged in sequence and isolated from each other along the extension direction of the water channel 102, a first connecting ear 105 disposed near the second motor barrel 104, and a second connecting ear 106 connected to the other end of the first connecting ear 105 away from the second motor barrel 104. Based on the structure of the rocker arm housing 100, the corresponding casting structure includes: a sand core body and a riser unit 20.

[0025] like Figure 2 and Figure 3 As shown, the sand core body matches the structure of the rocker arm housing 100 and is used to form the rocker arm housing 100 by pouring molten steel. Here, it should be noted that in order to better illustrate the optimization scheme of the casting structure corresponding to the molten steel pouring process of this embodiment, the structural design of the riser unit 20 is highlighted. Figure 2 and Figure 3 What is shown is a schematic diagram of the structure after the molten steel pouring is completed. The structure of the sand core is not shown in the figure, which does not affect the description of the casting structure scheme of this embodiment.

[0026] Analysis of the rocker arm housing's 100 structural features revealed that its largest thermal nodes are concentrated at the base of the first connecting lug 105, the base of the second connecting lug 106, and the separation structure between the first motor barrel 103 and the second motor barrel 104. Other thermal nodes are unevenly distributed throughout the rocker arm structure, and the moduli of these nodes vary relatively little. Based on this, the risers provided in the riser unit 20 are specifically designed as follows:

[0027] First, the riser unit 20 is composed of a plurality of risers, all of which are arranged on the upper surface of the sand core body 10 and correspond to at least the rocker arm planetary head 101, the partition structure 107 of the first motor barrel 103 and the second motor barrel 104, the second connecting ear 106, and the side of the second motor barrel 104 and the first connecting ear 105. In this way, during the molten steel pouring process, the riser unit 20 can compensate for the shrinkage of the molten metal during the casting process, and solve the casting defects such as looseness, shrinkage and air holes generated inside the large steel casting (i.e., the rocker arm housing 100). Specifically, as Figure 4 As shown, by setting the riser unit 20 to compensate for shrinkage, porosity (the structure of the area marked 210 in the figure), shrinkage holes (the structure of the area marked 220 in the figure) or air holes are concentrated at each riser of the riser unit 20, avoiding these casting defects in the casting content and ensuring the material density of the rocker arm housing.

[0028] Specifically, if Figure 2As shown, the riser unit 20 includes three first top risers 21 and two second top risers 22, located on the upper surface of the sand core at positions corresponding to the planetary head 101. These risers are spaced apart and arranged in corresponding areas on the upper surface of the sand core. In one embodiment, the first top risers 21 have a circular cross-section, a diameter of 190-210 mm, and a height of 215-235 mm; the second top risers 22 have a circular cross-section, a diameter of 170-190 mm, and a height of 190-210 mm. A preferred embodiment is one in which the first top risers 21 have a diameter of 200 mm and a height of 225 mm, while the second top risers 22 have a diameter of 180 mm and a height of 200 mm.

[0029] Next, the riser unit 20 also includes a third top riser 23 disposed on the upper surface of the sand core body, corresponding to the side area of ​​the second connecting ear 106. In one embodiment, the third top riser 23 has a circular cross-section, a diameter of 340-360 mm, and a height of 490-510 mm. A diameter of 350 mm and a height of 500 mm are preferred.

[0030] Next, the riser unit 20 also includes a fourth top riser 24 and a fifth top riser 25, which are disposed on the upper surface of the sand core body and correspond to the partition structure 107 between the first motor cylinder 103 and the second motor cylinder 104. The fourth top riser 24 and the fifth top riser 25 are spaced apart along the depth direction of the partition. In one embodiment, the fourth top riser 24 has a circular cross-section, a diameter of 270-290 mm, and a height of 390-410 mm; the fifth top riser 25 has a circular cross-section, a diameter of 315-335 mm, and a height of 440-460 mm. A preferred embodiment is one in which the fourth top riser 24 has a diameter of 280 mm and a height of 400 mm, while the fifth top riser 25 has a diameter of 325 mm and a height of 450 mm.

[0031] In addition, the riser unit 20 also includes two sixth top risers 26 disposed on the upper surface of the sand core body, corresponding to the sides of the first connecting ear 105 and the second motor cylinder 104. In one embodiment, the sixth top risers 26 have a circular cross-section, a diameter of 215-235 mm, and a height of 290-310 mm. A diameter of 225 mm and a height of 300 mm are preferred.

[0032] In another embodiment, the riser unit 20 further includes three seventh top risers 27 and one side riser 28 disposed on the upper surface of the sand core body corresponding to the area where the water channel 102 is located. The side riser 28 is disposed on the outer side of one end near the planetary head 101; the third top riser 27 is disposed on the inner and outer sides of both ends along the extension direction of the water channel 102. Specifically, the seventh top riser 27 has a circular cross-section with a diameter of 190-210 mm and a height of 340-360 mm; the side riser 28 has an elliptical cross-section with dimensions of Y180 mm x 270 mm and a height of 300-320 mm. A preferred embodiment is one in which the seventh top riser 27 has a diameter of 200 mm and a height of 350 mm, and the side riser 28 has dimensions of Y180 x 270 x 310 mm.

[0033] The above-mentioned arrangement of the first top riser 21, the second top riser 22, the third top riser 23, the fourth top riser 24, the fifth top riser 25, the sixth top riser 26, the seventh top riser 27 and the side riser 28 can, on the one hand, increase the static pressure head, which is beneficial to liquid shrinkage feeding of the casting; on the other hand, it can achieve overflow of the top molten steel, collect some of the early cold and dirty molten steel, and ensure the material density inside the casting.

[0034] In another embodiment, Figure 3 As shown, the third top riser 23 is positioned by the riser seat 231, so that the third top riser 23 can be accurately set to improve the effectiveness of the metal liquid shrinkage. Figure 2 As shown, a motor barrel subsidy 29 is provided below the fourth top riser 24 and the fifth top riser 25 to ensure effective shrinkage compensation of the lower portion of the partition structure 107 of the first motor barrel 103 and the second motor barrel 104, thereby ensuring material density and avoiding the occurrence of casting cracks.

[0035] In another embodiment, Figure 3 As shown, the casting structure of this embodiment also includes: multiple chills 30 provided on the bottom and sides of the sand core body, thereby improving the material density of the lower structure of the rocker arm housing 100 and improving the material utilization rate. Preferably, according to the structural characteristics of the dual-motor drum rocker arm, the chill process is adopted at key positions and dispersed hot nodes such as the bottom water channel position, the position of the rocker arm housing corresponding to the lower part of the coal wall side, and the two connecting ear roots. This not only accelerates the cooling of the casting in the area near the chill and improves the matrix structure, but also continuously reduces the temperature of the molten steel in direct contact with the chill during mold filling, allowing part of the molten steel to solidify and shrink in advance, thereby obtaining timely shrinkage compensation for the subsequent filling molten steel, reducing the shrinkage of the casting after solidification in the pouring system, and improving the quality of the casting.

[0036] In another embodiment, the casting structure further includes a gating system 40, which utilizes an open gating system design and a bottom pouring method. Specifically, the gating system 40 includes an ingate 41 located at the bottom of the planetary head section and on the sides of the first and second motor barrels. This allows the molten steel to enter the mold cavity through the ingate without contacting any sand mold structure. This minimizes the impact of the molten steel on the mold cavity and reduces defects such as sand inclusion and sticking caused by the impact of the molten steel.

[0037] Specifically, the gating system 40 includes an ingrown runner, a runner 42, and a sprue 43. The ingrown runner and the runner are perpendicular to each other. One end of the ingrown runner is connected to the runner or the sprue, and the other end is connected to the riser. In a preferred embodiment, based on the structure of the rocker arm housing 100, the pouring weight (GC) is about 7200 kg. Therefore, the ingrown runner can be made of four runners. The final cross-sectional ratio of the gating system components was 1:1.2:1.5 for the sprue, runner, and ingates, ensuring a high flow rate of molten steel and smooth mold filling. A gate boss at the root of the ingates can mitigate the pressure and speed of molten steel filling, reducing slag.

[0038] The casting structure of this embodiment rationally designs the risers, chills and pouring system, and optimizes and verifies the process through computer simulation technology. The above-mentioned various risers, chills and motor barrel subsidies are rationally and efficiently utilized during the casting process, successfully solving the major casting defects such as looseness, shrinkage holes and cracks inside the complex structure of the dual-motor barrel coal mining machine rocker arm housing cast steel parts, especially in the motor barrel separation structure, ensuring the material density of the casting and improving the quality of the casting.

[0039] The scope of protection of the present invention is not limited to the above-described embodiments. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the scope and spirit of the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A casting structure of a rocker arm housing of a dual-motor-barrel coal mining machine, the rocker arm housing comprising a planetary head, a water channel, a first motor barrel and a second motor barrel sequentially arranged and isolated from each other along the extension direction of the water channel, a first connecting ear arranged near the second motor barrel, and a second connecting ear connected to the other end of the first connecting ear away from the second motor barrel, characterized in that: The casting structure comprises: A sand core body, used for casting to form the rocker arm housing; A riser unit composed of multiple risers is at least arranged on the upper surface of the sand core body and corresponds to the rocker arm planetary head, the separation structure of the first motor barrel and the second motor barrel, the second connecting ear and the side positions of the second motor barrel and the first connecting ear.

2. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 1 is characterized in that: The riser unit includes three first top risers and two second top risers provided at positions on the upper surface of the sand core corresponding to the positions of the planetary heads, and are spaced apart and provided on corresponding areas on the upper surface of the sand core. The cross section of the first top riser is circular, with a diameter of 190-210 mm and a height of 215-235 mm; The cross section of the second top riser is circular, with a diameter of 170-190 mm and a height of 190-210 mm.

3. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 2 is characterized in that: The riser unit further includes a third top riser provided on the upper surface of the sand core body corresponding to the side area of ​​the second connecting ear; The cross section of the third top riser is circular, with a diameter of 340-360 mm and a height of 490-510 mm.

4. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 3 is characterized in that: The riser unit further includes a fourth top riser and a fifth top riser provided on the upper surface of the sand core body and corresponding to the separation position of the first motor cylinder and the second motor cylinder, and spaced apart along the depth direction of the separation; The fourth top riser has a circular cross-section, a diameter of 270-290 mm, and a height of 390-410 mm; The cross section of the fifth top riser is circular, with a diameter of 315-335 mm and a height of 440-460 mm.

5. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 4 is characterized in that: The third top riser is positioned by a riser seat; and / or, A motor barrel subsidy is further provided below the fourth top riser and the fifth top riser.

6. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 4 is characterized in that: The riser unit further includes two sixth top risers provided on the upper surface of the sand core body and corresponding to the sides of the first connecting ear and the second motor cylinder; The sixth top riser has a circular cross-section, a diameter of 215-235 mm, and a height of 290-310 mm.

7. The casting structure of the rocker arm housing of a dual-motor drum coal mining machine according to any one of claims 1 to 6, characterized in that: The risers further include three seventh top risers and one side riser provided on the upper surface of the sand core body corresponding to the area where the water channel is located; The side riser is arranged on the outer side of one end close to the planetary head, and the seventh top riser is arranged on the inner side and the outer side of both ends along the extension direction of the water channel; The seventh top riser has a circular cross-section, a diameter of 190-210 mm, and a height of 340-360 mm; The cross section of the edge riser is elliptical, with dimensions of Y180x270x310mm.

8. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 1 is characterized in that: The casting structure further comprises: a plurality of chillers arranged on the bottom and side surfaces of the sand core body.

9. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 1 is characterized in that: The casting structure also includes a gating system, The pouring system includes an inner gate arranged at the bottom of the planetary head section and the side positions of the first motor barrel and the second motor barrel to avoid any sand core structure of the sand core body.

10. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 9, characterized in that: The pouring system includes an ingrown runner, a runner and a sprue, wherein the ingrown runner and the runner are perpendicular to each other, one end of the ingrown runner is connected to the runner or the sprue, and the other end is connected to the riser; The inner runner adopts four and / or, the ratio of the cross-sectional areas of the sprue, the runner and the ingrain is 1:1.2:1.5.

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