Casting structure of double-motor drum shearer rocker housing
By setting riser units at key locations on the rocker arm housing of the dual-motor-drum coal mining machine and optimizing the gating system, casting defects were solved, and the quality and lifespan of the castings were improved.
Patent Information
- Application Number
- CN202521474401.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-07-15
AI Technical Summary
In existing casting structures, the rocker arm housing of a dual-motor drum coal mining machine is prone to casting defects such as porosity, shrinkage cavities, or cracks at the hot spot, affecting casting quality, precision, and service life.
Multiple riser units are set in the casting structure, especially in key parts of the rocker arm housing such as the planetary head, motor barrel partition structure and connecting lugs. The risers compensate for the shrinkage of the molten metal, and together with chills and an optimized gating system, the material density is ensured.
It effectively solved casting defects, improved the casting quality and service life of the rocker arm housing, ensured material density, and reduced the occurrence of casting defects.
Smart Images
Figure CN224673744U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of coal mining machine technology, specifically relating to a casting structure for the rocker arm housing of a dual-motor barrel coal mining machine. Background Technology
[0002] Casting is the process of pouring molten metal into a mold, allowing it to cool and solidify to obtain parts with the desired shape and properties. For the rocker arm housing of a dual-motor drum coal mining machine, the structure is large, with the largest hot spots concentrated at the roots of the two connecting lugs and the location of the separation structure between the two motor drums. Other hot spots are unevenly distributed throughout the rocker arm structure, with relatively small differences in the modulus of these hot spots. However, existing casting structures or processes often result in casting defects such as porosity, shrinkage cavities, or cracks at these hot spots. These defects significantly impact casting quality, casting precision, casting cost, and casting automation, severely affecting the service life of the transition frame. Utility Model Content
[0003] The purpose of this utility model is to address the shortcomings of the existing technology by providing a casting structure for the rocker arm housing of a dual-motor barrel coal mining machine. This solves the main casting defects such as porosity, shrinkage cavities, and cracks that occur inside the cast steel parts of the rocker arm housing of a complex dual-motor barrel coal mining machine, especially at the motor barrel partition structure, thereby improving the casting quality of the rocker arm housing.
[0004] This utility model provides a casting structure for the rocker arm housing of a dual-motor-drum coal mining machine. The rocker arm housing includes a planetary head, a water channel, a first motor cylinder and a second motor cylinder arranged sequentially and isolated from each other along the extension direction of the water channel, a first connecting lug disposed near the second motor cylinder, and a second connecting lug connected to the other end of the first connecting lug away from the second motor cylinder. The casting structure includes: a sand core body for casting to form the rocker arm housing; and a riser unit composed of multiple risers, at least disposed on the upper surface of the sand core body and corresponding to the rocker arm planetary head, the separation structure of the first motor cylinder and the second motor cylinder, the second connecting lug, and the side of the second motor cylinder and the first connecting lug.
[0005] Preferably, the riser unit includes three first top risers and two second top risers disposed on the upper surface of the sand core corresponding to the position of the planetary head, spaced apart on the corresponding area of the upper surface of the sand core. The first top risers have a circular cross-section with a diameter of 190-210 mm and a height of 215-235 mm; the second top risers have a circular cross-section with a diameter of 170-190 mm and a height of 190-210 mm.
[0006] Preferably, the riser unit further includes a third top riser disposed on the upper surface of the sand core body corresponding to the side region of the second connecting lug; the cross-section of the third top riser is circular, with a diameter of 340-360mm and a height of 490-510mm.
[0007] Preferably, the riser unit further includes a fourth top riser and a fifth top riser disposed on the upper surface of the sand core body and corresponding to the separation positions 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 with a diameter of 270-290mm and a height of 390-410mm; the fifth top riser has a circular cross-section 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 cylinder is provided below the fourth and fifth top risers.
[0009] Preferably, the riser further includes two sixth top risers disposed on the upper surface of the sand core and corresponding to the sides of the first connecting lug and the second motor cylinder; the cross-section of the sixth top riser is circular, with a diameter of 215-235mm and a height of 290-310mm.
[0010] Preferably, the riser unit further includes three seventh top risers and one side riser disposed on the upper surface of the sand core corresponding to the area where the waterway is located. The side riser is disposed on the outer side of one end near the planetary head. The seventh top risers are disposed on the inner and outer sides of both ends along the extension direction of the waterway. The cross-section of the seventh top riser is circular with a diameter of 190-210 mm and a height of 340-360 mm. The cross-section of the side riser is elliptical with dimensions of Y180x270x310 mm.
[0011] Preferably, the casting structure further includes multiple chills located on the underside and sides of the sand core.
[0012] Preferably, the casting structure also includes a gating system.
[0013] The gating system includes an inner gate located at the bottom of the planetary head cross-section and on the sides of the first motor barrel and the second motor barrel, to avoid any sand core structure of the sand core body.
[0014] Preferably, the gating system includes an ingate, a runner, and a sprue, the ingate and the runner being perpendicular to each other, one end of the ingate connecting to the runner or the sprue, and the other end connecting to the riser; the ingate employs four runners. The ceramic ingate; and / or the ratio of the cross-sectional areas of the sprue, the runner and the ingate is 1:1.2:1.5.
[0015] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.
[0016] The positive and progressive effects of this utility model are as follows:
[0017] According to the casting structure of the rocker arm housing of the dual-motor-drum coal mining machine involved in this utility model, risers are respectively set on the upper surface of the sand core body at the positions corresponding to the rocker arm planetary head, the separation position of the first motor cylinder and the second motor cylinder, the second connecting ear, and the side position of the second motor cylinder and the first connecting ear. In this way, during the steel pouring process, the risers can compensate for the shrinkage of the molten metal during the casting process, solve the casting defects such as porosity, shrinkage cavities and gas pores generated inside the cast steel parts of the rocker arm housing of the large dual-motor-drum coal mining machine, especially at the motor cylinder separation structure, ensure the material density of the rocker arm housing, and improve the casting quality of the rocker arm housing. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the rocker arm housing of the dual-motor barrel coal mining machine in an embodiment of this utility model.
[0019] Figure 2 This is a schematic diagram of the casting structure of the rocker arm housing of the dual-motor barrel coal mining machine in one direction after casting is completed, according to an embodiment of this utility model.
[0020] Figure 3 This is a schematic diagram of the casting structure of the rocker arm housing of the dual-motor barrel coal mining machine in another direction after casting is completed, according to an embodiment of this utility model.
[0021] Figure 4 This is a simulation diagram of the casting process of the rocker arm housing of the dual-motor-drum coal mining machine in an embodiment of this utility model. Detailed Implementation
[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 for the rocker arm housing of a dual-motor drum coal mining machine, used for casting 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 cylinder 103 and a second motor cylinder 104 arranged sequentially and isolated from each other along the extension direction of the water channel 102, a first connecting lug 105 disposed near the second motor cylinder 104, and a second connecting lug 106 connected to the other end of the first connecting lug 105 away from the second motor cylinder 104. Based on the structure of the rocker arm housing 100, the corresponding casting structure includes a sand core 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. It should be noted that, to better illustrate the optimized casting structure of this embodiment corresponding to the molten steel pouring process, and to highlight the structural design of the riser unit 20, Figure 2 and Figure 3 The diagram shows the structure after the molten steel has been poured. The structure of the sand core is not shown in the diagram, but this does not affect the description of the casting structure in this embodiment.
[0026] Analysis of the structural features of the rocker arm housing 100 reveals that its largest hot spots 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 cylinder 103 and the second motor cylinder 104. Other hot spots are unevenly distributed throughout the rocker arm structure, with relatively small differences in their modulus. Based on this, the riser unit 20 is configured with the following risers:
[0027] First, the riser unit 20 consists of multiple risers, all of which are located on the upper surface of the sand core body 10, and at least correspond to the positions of the separation structure 107 between the rocker arm planetary head 101, the first motor cylinder 103 and the second motor cylinder 104, the second connecting lug 106, and the sides of the second motor cylinder 104 and the first connecting lug 105. Thus, during the steel pouring process, the riser unit 20 can compensate for the shrinkage of the molten metal during casting, solving casting defects such as porosity, shrinkage cavities, and gas porosity inside the large cast steel part (i.e., the rocker arm housing 100). Specifically, as shown... Figure 4 As shown, by setting riser units 20 for feeding, the porosity (structure of the area marked 210 in the figure), shrinkage cavities (structure of the area marked 220 in the figure), or air holes are concentrated at each riser of riser unit 20, avoiding these casting defects in the casting and ensuring the material density of the rocker arm shell.
[0028] Specifically, such as 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 corresponding to the planetary head 101, spaced apart on the corresponding area of the upper surface of the sand core. In one specific embodiment, the first top riser 21 has a circular cross-section with a diameter of 190-210 mm and a height of 215-235 mm; the second top riser 22 has a circular cross-section with a diameter of 170-190 mm and a height of 190-210 mm. The preferred embodiment is where the first top riser 21 has a diameter of 200 mm and a height of 225 mm, and the second top riser 22 has a diameter of 180 mm and a height of 200 mm.
[0029] Secondly, 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 region of the second connecting lug 106. In one specific embodiment, the cross-section of the third top riser 23 is circular, with a diameter of 340-360 mm and a height of 490-510 mm. Among them, a diameter of 350 mm and a height of 500 mm for the third top riser 23 is the preferred embodiment.
[0030] Furthermore, the riser unit 20 also includes a fourth top riser 24 and a fifth top riser 25 disposed on the upper surface of the sand core and corresponding to the partition structure 107 of 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 specific embodiment, the cross-section of the fourth top riser 24 is circular, with a diameter of 270-290 mm and a height of 390-410 mm; the cross-section of the fifth top riser 25 is circular, with a diameter of 315-335 mm and a height of 440-460 mm. The preferred embodiment is that the fourth top riser 24 has a diameter of 280 mm and a height of 400 mm, and 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 and corresponding to the sides of the first connecting lug 105 and the second motor cylinder 104. In one specific embodiment, the cross-section of the sixth top riser 26 is circular, with a diameter of 215-235 mm and a height of 290-310 mm. Among them, a diameter of 225 mm and a height of 300 mm for the sixth top riser 26 is the preferred embodiment.
[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 corresponding to the area where the waterway 102 is located. The side riser 28 is disposed on the outer side of one end near the planetary head 101; the third top risers 27 are disposed on the inner and outer sides of both ends along the extension direction of the waterway 102. Specifically, the cross-section of the seventh top riser 27 is circular, with a diameter of 190-210 mm and a height of 340-360 mm; the cross-section of the side riser 28 is elliptical, with dimensions of Y180 mm x 270 mm and a height of 300-320 mm. Among these, the preferred embodiment is that 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 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 increases the static pressure head, which is beneficial for liquid feeding of the casting. On the other hand, it can realize the overflow of molten steel at the top, collect some of the cold and dirty molten steel in the early stage, and ensure the material density inside the casting.
[0034] In another embodiment, such as Figure 3 As shown, the third top riser 23 is positioned and set by the riser seat 231, thereby accurately setting the third top riser 23 and improving the effectiveness of molten metal feeding. Additionally, as... Figure 2 As shown, a motor cylinder supplement 29 is provided below the fourth top riser 24 and the fifth top riser 25 to ensure effective feeding of the lower part of the separation structure 107 between the first motor cylinder 103 and the second motor cylinder 104, ensure material density, and avoid the occurrence of casting cracks.
[0035] In another embodiment, such as Figure 3 As shown, the casting structure of this embodiment also includes multiple chills 30 located below and on the sides of the sand core, thereby increasing the material density of the lower structure of the rocker arm housing 100 and improving material utilization. Preferably, based on the structural characteristics of the dual-motor barrel rocker arm, chills are used at key locations such as the bottom water channel, the lower part of the rocker arm housing corresponding to the coal wall side, and the two connecting lug roots, as well as at dispersed hot spots. This not only accelerates the cooling of the casting near the chills and improves the matrix structure, but also continuously reduces the temperature of the molten steel in direct contact with the chills during filling, allowing some of the molten steel to solidify and shrink prematurely, thus ensuring timely replenishment of the subsequent filling molten steel. This reduces the shrinkage of the casting after solidification in the gating system and improves the quality of the casting.
[0036] In another embodiment, the casting structure also includes a gating system 40, which adopts an open gating system design principle and a bottom-pouring design. That is, the gating system 40 includes an ingate 41 located at the bottom of the planetary head cross-section and on the sides of the first and second motor cylinders, to avoid any sand core structure of the sand core body. This ensures that the molten steel does not come into contact with any sand mold after entering the cavity through the ingate, minimizing the impact force of the molten steel on the cavity and reducing defects such as sand inclusions and sand adhesion caused by the impact of molten steel.
[0037] Specifically, the gating system 40 includes an ingate, a runner 42, and a sprue 43. The ingate and runner are perpendicular to each other. One end of the ingate connects to either the runner or the sprue, and the other end connects to a riser. In a preferred embodiment, based on the structure of the rocker arm housing 100, the gating weight (GC) is approximately 7200 kg. Therefore, four ingates can be used. The system utilizes a ceramic ingate. Furthermore, the final selected gating system has a cross-sectional ratio of approximately 1:1.2:1.5 for the sprue, runner, and ingate, ensuring a large flow rate and stable filling of the molten steel. A gating boss is installed at the root of the ingate to reduce the pressure and speed of the molten steel filling, thus reducing oxide slag to some extent.
[0038] The casting structure of this embodiment rationally designs risers, chills, and gating systems, and optimizes and verifies the process through computer simulation technology. During the casting process, the various risers, chills, and motor barrel supplements mentioned above are rationally and efficiently utilized, successfully solving the main casting defects such as porosity, shrinkage cavities, and cracks that occur inside the cast steel parts of the rocker arm shell of the complex double-motor barrel coal mining machine, especially at the motor barrel partition structure, ensuring the material density of the casting and improving the quality of the casting.
[0039] The scope of protection of this utility model is not limited to the above-described embodiments. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its scope and spirit. If these modifications and variations fall within the scope of the claims of this utility model and their equivalents, then the intent of this utility model also includes these modifications and variations.
Claims
1. A casting structure of a double motor drum shearer rocker housing, the rocker housing comprising a planetary head, a water channel, a first motor drum and a second motor drum arranged in sequence and isolated from each other along the extension direction of the water channel, a first connecting lug arranged close to the second motor drum, and a second connecting lug connected to the other end of the first connecting lug away from the second motor drum, characterized in that, The casting structure includes: Sand core, used for casting to form the rocker arm housing; A riser unit consisting of multiple risers is provided at least on the upper surface of the sand core and at a position corresponding to the rocker arm planetary head, the separation structure of the first motor cylinder and the second motor cylinder, the second connecting lug, and the side of the second motor cylinder and the first connecting lug.
2. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 1, characterized in that, The riser unit includes three first top risers and two second top risers located on the upper surface of the sand core at positions corresponding to the planetary head, spaced apart on the corresponding areas of the upper surface of the sand core. The first top riser has a circular cross-section with a diameter of 190-210mm and a height of 215-235mm; The second top riser has a circular cross-section with a diameter of 170-190mm and a height of 190-210mm.
3. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 2, characterized in that, The riser unit further includes a third top riser disposed on the upper surface of the sand core body corresponding to the side region of the second connecting lug; The cross-section of the third top riser is circular, with a diameter of 340-360mm and a height of 490-510mm.
4. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 3, characterized in that, The riser unit further includes a fourth top riser and a fifth top riser disposed on the upper surface of the sand core and corresponding to the separation position of the first motor cylinder and the second motor cylinder, and are spaced apart 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 fifth top riser has a circular cross-section with a diameter of 315-335mm and a height of 440-460mm.
5. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 4, characterized in that, The third top riser is positioned by a riser seat; and / or, Below the fourth and fifth risers, there is also a motor cylinder supplement.
6. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to claim 4, characterized in that, The riser unit further includes two sixth top risers disposed on the upper surface of the sand core and corresponding to the sides of the first connecting lug and the second motor cylinder; The sixth top riser has a circular cross-section with a diameter of 215-235mm and a height of 290-310mm.
7. The casting structure of the rocker arm housing of the dual-motor drum coal mining machine according to any one of claims 1 to 6, characterized in that, The riser also includes three seventh top risers and one side riser disposed on the upper surface of the sand core corresponding to the area where the waterway is located; The side riser is located on the outer side of one end near the planetary head, and the seventh top riser is located on the inner and outer sides of both ends along the extension direction of the waterway. The cross-section of the seventh riser is circular, with a diameter of 190-210mm and a height of 340-360mm; The side riser has an elliptical cross-section with dimensions of Y180x270x310mm.
8. The cast construction of a dual motor canister shearer rocker housing of claim 1 wherein, The casting structure also includes multiple chills located on the underside and sides of the sand core.
9. The cast construction of a dual motor canister shearer rocker housing of claim 1 wherein, The casting structure also includes a gating system. The gating system includes an inner gate located at the bottom of the planetary head cross-section and on the sides 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 gating system includes an ingate, a runner, and a sprue. The ingate and the runner are perpendicular to each other. One end of the ingate is connected to the runner or the sprue, and the other end is connected to the riser. The inner gate adopts four ceramic inner gates; and / or, the ratio of the cross-sectional area of the straight gate, the cross gate and the inner gate is 1:1.2:1.5.