A cast steel forming auxiliary mold device for a mine dump truck

Abstract

The application relates to an auxiliary casting mold device for cast steel forming of a mine dump truck, which comprises a ventilation device composed of a ventilation pipe, a pressure regulating box and an air inlet box, and a fixed mold frame for cast steel forming; the upper port of the pressure regulating box is communicated with the lower port of the air inlet box; the ventilation pipe is provided with a ventilation triggering device at the end; an adjusting pipe is slidably connected in the air inlet box; the adjusting pipe is a pipe structure with a contraction in the middle and expansion at both ends; the application utilizes the pressure change caused by the contraction and expansion positions of the adjusting pipe by the cooling airflow to adjust the pressure in the pressure regulating cavity, and further adjusts the suction process of the ventilation pipe to the gas in the fixed mold frame; on one hand, the gas in the fixed mold frame is timely sucked into the pressure regulating cavity to avoid the residual gas in the fixed mold frame; on the other hand, after pouring is completed, the liquid cast steel material in the ventilation pipe is re-pressed into the fixed mold frame to reduce the loss of the cast steel material.

Description

Technical Field

[0001] This invention belongs to the field of mold equipment technology, specifically relating to an auxiliary casting mold device for forming cast steel for mining dump trucks. Background Technology

[0002] The research and application of high-strength cast steel composite materials for mining dump trucks is closely integrated with major engineering projects and equipment, mainly in the following aspects: The demands of major engineering projects drive the development of mining dump trucks, which, as key transportation equipment in mining, bear the heavy responsibility of transporting ore from underground to the surface. Major mining projects place extremely high demands on the load-bearing capacity, safety, and reliability of dump trucks. The research on high-strength cast steel composite materials aims to meet these high performance requirements of dump trucks in major projects, thereby improving project efficiency, reducing operating costs, and ensuring project safety. The successful development of high-strength cast steel composite materials provides technical support for the upgrading and replacement of mining dump trucks, as well as for the upgrading and replacement of major equipment. This material possesses high strength, wear resistance, and lightweight properties. The advantages of high-strength cast steel composite materials for mining dump trucks can significantly improve their service life and operational efficiency. Combined with the research and development of major equipment, such as large-scale mining equipment and automated loading equipment, it can make the entire mining transportation system more efficient and intelligent. The project's research results can be applied not only to mining dump trucks but also to other engineering machinery and transportation fields, such as heavy trucks, engineering excavators, and port machinery. Through integration with major projects or equipment, the industrial chain is extended, and related industries such as casting, material processing, and transportation services will also be upgraded. The research and application of high-strength cast steel composite materials for mining dump trucks is closely integrated with major projects or equipment, providing strong support for the development of related industries in my country.

[0003] The development of high-strength cast steel composite materials relies not only on the precise design of material formulations, but also on the improvement of their production processes. During the casting process, molten cast steel material needs to be poured into a fixed mold frame, which is then used to process the cast steel material into specific components. After cooling and fixing, if the gas in the fixed mold frame cannot be discharged in time during the casting process, it will form pores in the cast steel component, affecting its quality.

[0004] Chinese Patent Application No. 202011540999.0 discloses an exhaust system component for die casting molds. By setting an extraction pipe on the exhaust block body, the gas in the die casting mold cavity is extracted, thereby improving the performance of die casting products and greatly reducing the defect rate of die casting products. However, during the extraction process, molten cast steel material cannot be avoided from entering the extraction pipe, which can easily lead to waste of cast steel material. In addition, the exhaust system can also promote gas flow and accelerate the cooling rate of cast steel parts.

[0005] To address the aforementioned technical shortcomings, an auxiliary casting mold device is provided for the casting of cast steel for mining dump trucks. This device is used to extract air from the fixed mold frame and reduce waste of cast steel materials. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an auxiliary casting mold device for forming cast steel for mining dump trucks to solve the above problems.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an auxiliary casting mold device for forming cast steel for mining dump trucks, comprising a ventilation device consisting of a ventilation pipe, a pressure regulating box, and an air inlet box, and a fixed mold frame for forming the cast steel. The fixed mold frame is provided with an exhaust port, and one end of the ventilation pipe is connected to the exhaust port on the fixed mold frame. The pressure regulating box is provided with upper and lower ports, and the air inlet box is provided with upper, lower, and side ports. The upper port of the pressure regulating box is connected to the lower port of the air inlet box. A ventilation triggering device is provided at the other end of the ventilation pipe. An adjusting pipe is slidably connected inside the air inlet box. The adjusting pipe has a pipe structure that contracts in the middle and expands at both ends, and the adjusting pipe is close to the narrow throat where the contraction occurs. Two rows of side through holes are provided on the part and the side near the lower port. The distance between the two rows of side through holes on the regulating pipe is greater than the width of the regulating cavity to prevent the two rows of side through holes from communicating with the pressure regulating cavity at the same time during the sliding of the regulating pipe. The middle part of the pressure regulating box protrudes outward and forms an annular pressure regulating cavity with the side wall of the regulating pipe. The side of the pressure regulating cavity is connected to the upper part of the air exchange pipe near the trigger device through an L-tube. A U-shaped bracket is provided in the upper port of the regulating pipe. A push-pull rod is fixed on the U-shaped bracket. The push-pull rod is inserted into the air intake box. The upper port of the air intake box is covered with a first end cover. A telescopic rod is provided in the air intake box. The bottom end of the telescopic rod is fixedly connected to the first end cover. The telescopic end of the telescopic rod is fixedly connected to the upper end of the push-pull rod.

[0008] The ventilation triggering device includes a positioning plate, a second end cap distributed on the left and right sides of the positioning plate, and a limiting plate. The positioning plate is clamped in the annular groove of the ventilation pipe port, and the second end cap covers the ventilation pipe port to clamp and fix the positioning plate. A sliding rod is fixed in the middle of the back side of the limiting plate. The sliding rod passes through the positioning plate, and multiple spring pieces are distributed around the sliding rod between the positioning plate and the limiting plate. The middle of the spring pieces protrudes towards the side wall near the ventilation pipe. One end of the spring piece is fixedly connected to the positioning plate, and the other end of the spring piece is fixedly connected to the limiting plate. A pressure sensor is fixed inside the second end cap. Each pressure sensor is provided with a corresponding pressure plate. The pressure plate is fixedly connected to the sliding rod. The pressure sensor is connected through a signal line telescopic rod.

[0009] Preferably, the end of the ventilation pipe of the ventilation device away from the fixed mold frame is inclined upward to ensure that the liquid cast steel material entering the ventilation pipe under positive pressure is re-pressed into the fixed mold.

[0010] The beneficial effects of this invention are as follows: This invention involves two processes: alternately pouring liquid cast steel material into two fixed mold frames and cooling and shaping the liquid cast steel material. When cooling the liquid cast steel material in one of the fixed mold frames, the cooling airflow flows through the regulating pipe in the pressure regulating box. The side through-hole of the contraction part of the regulating pipe is connected to the pressure regulating chamber, forming a negative pressure in the pressure regulating chamber. Under the action of the pressure difference, the gas inside the fixed mold frame is drawn into the pressure regulating chamber, avoiding residual gas in the fixed mold frame. After pouring is completed, the liquid cast steel material flows into the ventilation pipe and comes into contact with the spring sheet. Utilizing the thermal expansion and contraction characteristics of the spring sheet, the spring sheet expands and deforms due to heat, pushing the slide rod to slide. The pressure signal acting on the pressure sensor by the adjustment plate controls the extension and retraction of the telescopic rod, so that the side through-hole of the expansion part of the regulating pipe is connected to the pressure regulating chamber. The cooling airflow enters the regulating chamber from the regulating pipe, forming a positive pressure, which re-presses the liquid cast steel material that has entered the ventilation pipe back into the fixed mold frame, reducing the loss of cast steel material. Attached Figure Description

[0011] Figure 1 A structural diagram of the auxiliary casting device is shown in the front view.

[0012] Figure 2 Side view of the auxiliary casting mold device;

[0013] Figure 3 This is a structural diagram of the ventilation pipe;

[0014] Figure 4 This is a structural diagram of the ventilation device;

[0015] The following are the labels in the diagram: 1. Ventilation pipe; 2. Pressure regulating box; 201. Pressure regulating chamber; 3. Air inlet box; 4. Fixed mold frame; 401. Exhaust port; 5. Ventilation trigger device; 6. Adjusting pipe; 601. Meter-shaped bracket; 7. L-pipe; 8. Push-pull rod; 9. First end cover; 10. Telescopic rod; 11. Positioning plate; 12. Second end cover; 13. Limiting plate; 14. Slide rod; 15. Spring piece; 16. Pressure plate; 17. Pressure sensor. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1-4As shown, an auxiliary casting mold device for forming cast steel for mining dump trucks includes a ventilation device consisting of a ventilation pipe 1, a pressure regulating box 2, and an air inlet box 3, as well as a fixed mold frame 4 for forming the cast steel. The fixed mold frame 4 is provided with an exhaust port 401. The end of the ventilation pipe 1 away from the fixed mold frame 4 is inclined upwards to ensure that the liquid cast steel material entering the ventilation pipe 1 under positive pressure is re-pressed into the fixed mold 4. One end of the ventilation pipe 1 is connected to the exhaust port 401 on the fixed mold frame 4. The pressure regulating box 2 is provided with upper and lower ports, and the air inlet box 3 is provided with upper, lower, and side ports. The upper port of the pressure regulating box 2 is connected to the lower port of the air inlet box 3. The other end of the ventilation pipe 1 is provided with a ventilation triggering device 5. An adjusting pipe 6 is slidably connected inside the air inlet box 3. The adjusting pipe 6 has a pipe structure that contracts in the middle and expands at both ends. Two rows of side through holes are provided on the side of the regulating pipe 6 near the narrow throat of the contraction and near the lower port. The distance between the two rows of side through holes on the regulating pipe 6 is greater than the width of the regulating cavity 201 to prevent the two rows of side through holes from communicating with the pressure regulating cavity 201 at the same time during the sliding of the regulating pipe 6. The middle part of the pressure regulating box 2 protrudes outward and forms an annular pressure regulating cavity 201 with the side wall of the regulating pipe 6. The side of the pressure regulating cavity 201 is connected to the upper part of the air exchange pipe 1 near the trigger device 5 through an L-tube. A U-shaped bracket 601 is provided in the upper port of the regulating pipe 6. A push-pull rod 8 is fixed on the U-shaped bracket 601. The push-pull rod 8 is inserted into the air intake box 3. The upper port of the air intake box 3 is covered with a first end cover 9. A telescopic rod 10 is provided in the air intake box 3. The bottom end of the telescopic rod 10 is fixedly connected to the first end cover 9. The telescopic end of the telescopic rod 10 is fixedly connected to the upper end of the push-pull rod 8.

[0018] In this embodiment, the ventilation triggering device 5 includes a positioning plate 11, a second end cap 12 distributed on the left and right sides of the positioning plate 11, and a limiting plate 13. The positioning plate 11 is clamped in the annular groove at the port of the ventilation pipe 1, and the second end cap 12 covers the port of the ventilation pipe 1 to clamp and fix the positioning plate 11. A sliding rod 14 is fixed in the middle of the back side of the limiting plate 13. The sliding rod 14 passes through the positioning plate 11, and multiple spring pieces 15 are distributed around the sliding rod 14 between the positioning plate 11 and the limiting plate 13. The middle of the spring piece 15 protrudes towards the side wall near the ventilation pipe 1. One end of the spring piece 15 is fixedly connected to the positioning plate 11, and the other end of the spring piece 15 is fixedly connected to the limiting plate 13. A pressure sensor 17 is fixed inside the second end cap 12. Each pressure sensor 17 is provided with a corresponding pressure plate 16. The pressure plate 16 is fixedly connected to the sliding rod 14. The pressure sensor 17 is connected through a signal line telescopic rod 10.

[0019] In this embodiment, when the auxiliary casting device is working, the side port of the air inlet box 3 is connected to the cooling pipe for the fixed mold frame 4, and the air exchange pipe 1 is connected to the exhaust port 401 of the fixed mold frame 4. This alternately pours liquid cast steel material into the two fixed mold frames 4 and cools and shapes the liquid cast steel material. During the cooling and shaping process of the liquid cast steel material poured into the fixed mold frame 4, the cooling airflow generated passes through the cooling pipe, air inlet box 3, and pressure regulating box 2 before being discharged. As the cooling airflow flows through the regulating pipe 6 in the pressure regulating box 2, a negative pressure is generated at the contraction part of the regulating pipe 6, and a positive pressure is generated at the expansion part. The side through-hole at the contraction part of the regulating pipe 6 is connected to the pressure regulating chamber 201, creating a negative pressure within the pressure regulating chamber 201. During the pouring of liquid cast steel material into the fixed mold frame 4, due to the negative pressure within the pressure regulating chamber 201, the liquid cast steel material fills the internal cavity of the fixed mold frame 4. Simultaneously, the gas inside the fixed mold frame 4 is affected by the pressure difference. The liquid cast steel material is drawn into the pressure regulating chamber 201. After casting is completed, the liquid cast steel material flows into the ventilation pipe 1 and comes into contact with the spring plate 15. The spring plate 15 absorbs the heat of the liquid cast steel material, expands due to heat, and deforms, pushing the slide rod 14 to slide. The pressure signal of the pressure plate 16 acting on the pressure sensor 17 is adjusted. The telescopic rod 10 contracts according to the pressure signal, causing the regulating pipe 6 to slide upward, so that the side through hole of the expansion part of the regulating pipe 6 is connected to the pressure regulating chamber 201. The cooling airflow enters the regulating chamber 201 from the regulating pipe 6 to form a positive pressure, which re-presses the liquid cast steel material that has entered the ventilation pipe 1 into the fixed mold frame 4. That is, the cooling airflow generated during the cooling and shaping process of the cast steel material is used to adjust the air pressure in the ventilation pipe 1 through the pressure regulating box 2. The negative pressure is used to draw out the gas in the fixed mold frame 4, and the positive pressure is used to re-press a small amount of liquid cast steel material that has entered the ventilation pipe 1 into the fixed mold frame 4, reducing the loss of cast steel material.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary casting mold device for forming cast steel for mining dump trucks, comprising a ventilation device consisting of a ventilation pipe, a pressure regulating box, and an air inlet box, and a fixed mold frame for forming the cast steel, wherein the fixed mold frame is provided with an exhaust port, and one end of the ventilation pipe is connected to the exhaust port on the fixed mold frame; the pressure regulating box is provided with upper and lower ports, and the air inlet box is provided with upper, lower, and side ports; the upper port of the pressure regulating box is connected to the lower port of the air inlet box; the other end of the ventilation pipe is provided with a ventilation triggering device; an adjusting pipe is slidably connected inside the air inlet box; the adjusting pipe has a pipe structure that contracts in the middle and expands at both ends; the adjusting pipe is located near the narrow throat of the contraction and near the lower port. Two rows of side through holes are provided on the side, and the distance between the two rows of side through holes on the regulating pipe is greater than the width of the regulating cavity, so as to prevent the two rows of side through holes from communicating with the pressure regulating cavity at the same time during the sliding of the regulating pipe. The middle part of the pressure regulating box protrudes outward and forms an annular pressure regulating cavity with the side wall of the regulating pipe. The side of the pressure regulating cavity is connected to the upper part of the air exchange pipe near the trigger device through an L-tube. A U-shaped bracket is provided in the upper port of the regulating pipe, and a push-pull rod is fixed on the U-shaped bracket. The push-pull rod is inserted into the air intake box. The upper port of the air intake box is covered with a first end cover. A telescopic rod is provided in the air intake box. The bottom end of the telescopic rod is fixedly connected to the first end cover, and the telescopic end of the telescopic rod is fixedly connected to the upper end of the push-pull rod.

2. The auxiliary casting mold device for forming cast steel for mining dump trucks according to claim 1, characterized in that, The ventilation triggering device includes a positioning plate, a second end cap distributed on the left and right sides of the positioning plate, and a limiting plate. The positioning plate is clamped in the annular groove of the ventilation pipe port, and the second end cap covers the ventilation pipe port to clamp and fix the positioning plate. A sliding rod is fixed in the middle of the back side of the limiting plate. The sliding rod passes through the positioning plate, and multiple spring pieces are distributed around the sliding rod between the positioning plate and the limiting plate. The middle of the spring pieces protrudes towards the side wall near the ventilation pipe. One end of the spring piece is fixedly connected to the positioning plate, and the other end of the spring piece is fixedly connected to the limiting plate. A pressure sensor is fixed inside the second end cap. Each pressure sensor is provided with a corresponding pressure plate. The pressure plate is fixedly connected to the sliding rod. The pressure sensor is connected through a signal line telescopic rod.

3. An auxiliary casting mold device for forming cast steel for mining dump trucks according to claim 1 or 2, characterized in that, The ventilation pipe of the ventilation device is inclined upward at the end away from the fixed mold frame, ensuring that the liquid cast steel material entering the ventilation pipe under positive pressure is re-pressed into the fixed mold.

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