A cast iron pipe casting device capable of automatically adjusting casting quantity

Abstract

The utility model relates to cast -iron pipe production equipment technical field provides a cast -iron pipe casting device of automatic regulation pouring quantity, including tipping frame, tipping frame, servo drive motor speed reducer, pinion, big sector gear, connecting rod drive mechanism and molten iron sector package, the upper end rotatable setting turnover shaft of tipping frame, and tipping frame is fixedly installed on the turnover shaft, tipping frame is fixedly installed with molten iron sector package in, the lower end of tipping frame is installed with servo drive motor speed reducer, the both ends of servo drive motor speed reducer are connected with transmission shaft respectively, the end of transmission shaft sets up pinion, and pinion is engaged with big sector gear, big sector gear is hinged with tipping frame, big sector gear is hinged with connecting rod drive mechanism, connecting rod drive mechanism is fixedly connected with turnover shaft, the utility model can make the actual molten iron quantity of molten iron sector package more uniform equality in unit time, improves cast -iron production qualified rate.

Description

Technical Field

[0001] This utility model relates to the technical field of cast iron pipe production equipment, and in particular to a cast iron pipe casting device that can automatically adjust the pouring volume. Background Technology

[0002] Casting and centrifugation are the most crucial steps in the production of cast iron pipes. They are processes that transform molten iron into pipes, and the precision control of these steps directly determines the quality of the pipes (pipe weight, wall thickness, etc.) and the pass rate. By driving a fan-shaped ladle filled with molten iron to rotate at a constant angular velocity, the molten iron flows evenly and in equal amounts along the drop trough and flow channel of the casting machine into a high-speed rotating mold equipped with spray cooling or water immersion cooling. The centrifuge unit containing the mold moves at a constant speed in coordination with the rotation of the fan-shaped ladle, causing the molten iron on the inner wall of the mold to quickly solidify, forming a cast iron pipe with uniform and qualified wall thickness.

[0003] Currently, cast iron pipe casting equipment typically employs a combination of hydraulic cylinders, hydraulic proportional valves, constant velocity plates, and encoders to drive a sector-shaped ladle to rotate at approximately constant angular velocity. The hydraulic proportional valves control the hydraulic cylinders to extend and retract at a uniform speed, while the constant velocity plates convert this uniform extension and retraction into the rotation of the sector-shaped ladle at approximately constant angular velocity. An encoder mounted on the ladle's rotation shaft monitors the position of the rotation. The centrifugal generator moves in coordination with the rotation speed of the sector-shaped ladle, thereby producing qualified pipes.

[0004] Based on feedback from years of actual production, this casting device has several drawbacks: Because the uniform linear motion of the cylinder is converted into constant angular velocity rotation via a constant velocity plate, the trajectory approximated by the constant velocity plate is subject to wear during use. This motion conversion cannot achieve high precision. Furthermore, the hydraulic proportional control valve has low control precision and sensitivity, and is an open-loop control method. Since slag adheres to the sides and nozzle of the ladle after it is filled with molten iron, the actual equal fan-shaped surfaces of the ladle are not equal, resulting in discrepancies that cannot be detected and adjusted in real time. Therefore, in actual production, especially in the production of thin-walled tubes and small-diameter cast iron tubes, the pass rate is not very high due to errors in weight, wall thickness, and wall thickness uniformity. Moreover, the use of a hydraulic drive mechanism requires a hydraulic pump station, valve platform, hydraulic pipelines, etc., resulting in high maintenance and pollution costs. Utility Model Content

[0005] This invention primarily addresses the technical problems of existing cast iron pipe casting devices that use hydraulic cylinders, proportional valves, constant velocity plates, and encoders to drive the sector ladle. These devices experience wear during use, cannot achieve high precision in motion conversion, and lack real-time detection, feedback, and adjustment capabilities. The invention proposes a cast iron pipe casting device that automatically adjusts the pouring volume, ensuring a more uniform and consistent amount of molten iron flowing from the sector ladle per unit time. This avoids unequal amounts of molten iron due to factors such as slag buildup within the sector ladle, thereby improving the yield rate of cast iron production.

[0006] This utility model provides a cast iron pipe casting device with automatic adjustment of pouring volume, including: ladle frame 3, ladle rack 9, servo drive motor reducer 4, pinion 13, large sector gear 12, linkage drive mechanism and molten iron sector ladle 1;

[0007] The upper end of the flipping frame 3 is rotatably provided with a flipping shaft 14, and a flipping frame 9 is fixedly installed on the flipping shaft 14; a molten iron fan-shaped ladle 1 is fixedly installed inside the flipping frame 9.

[0008] The lower end of the bag-flipping frame 3 is equipped with a servo drive motor reducer 4; both ends of the servo drive motor reducer 4 are connected to the transmission shaft 11 respectively, and the end of the transmission shaft 11 is provided with a small gear 13, which meshes with a large sector gear 12.

[0009] The large sector gear 12 is hinged to the flipping frame 3, and the large sector gear 12 is hinged to the connecting rod drive mechanism; the connecting rod drive mechanism is fixedly connected to the flipping shaft 14.

[0010] Multiple weighing sensors 5 are evenly arranged at the bottom of the bag-flipping frame 3.

[0011] Preferably, a bushing is provided at the upper end of the bag-flipping frame 3, through which the flipping shaft 14 can be rotatably mounted.

[0012] Preferably, the large sector gear 12 is hinged to the flip frame 3 via the first hinge shaft 16.

[0013] Preferably, the linkage drive mechanism includes: a linkage 2 and a hinged arm 15;

[0014] The bottom end of the connecting rod 2 is hinged to the large sector gear 12 via the second hinge shaft 17, and the top end of the connecting rod 2 is hinged to one end of the hinge arm 15 via the third hinge shaft 18; the other end of the hinge arm 15 is fixed to the flip shaft 14.

[0015] Preferably, the distance between the centers of the first hinge 16 and the second hinge 17 is equal to the distance between the centers of the third hinge 18 and the flipping shaft 14;

[0016] The distance between the centers of the second hinge 17 and the third hinge 18 is equal to the distance between the centers of the first hinge 16 and the flipping shaft 14.

[0017] Preferably, the bag-flipping frame 3 is positioned above the base 6;

[0018] Multiple weighing sensors 5 are installed between the bottom of the bag-flipping frame 3 and the base 6.

[0019] Preferably, the flip-up frame 3 is located at the rear of the base 6, and the casting trolley track support 7 is installed on the front of the base 6;

[0020] The track of the casting trolley track support 7 is equipped with two casting trolleys 8 that can move left and right.

[0021] Preferably, the front end of the casting trolley 8 is equipped with a flow channel 10, which can penetrate into the tube mold of the centrifuge host 19.

[0022] This invention provides an automatic adjustable casting iron pipe casting device, breaking away from traditional design concepts. It employs a novel servo motor + reducer + linkage drive mechanism to directly drive the ladle-turning frame. A parallelogram structure is formed between the first, second, and third hinge shafts and the flipping shaft, ensuring that the angular velocity of the ladle-turning frame and the molten iron fan-shaped ladle perfectly matches the angular velocity output by the servo drive mechanism. This allows the molten iron fan-shaped ladle to rotate around the fixed flipping axis at a constant angular velocity, resulting in greater accuracy and stability and guaranteeing that the amount of molten iron poured into the pipe mold is uniform and equal per unit time. Furthermore, this invention utilizes multiple weighing sensors installed below the ladle-turning frame to monitor the changes in molten iron in the fan-shaped ladle in real time and feeds the data back to the control system for real-time adjustment of the servo motor's angular velocity. This invention truly achieves fully closed-loop control, making the actual amount of molten iron flowing out of the fan-shaped ladle more uniform and equal per unit time. This avoids unequal amounts of molten iron due to factors such as slag buildup inside the ladle, thus significantly improving the yield rate of cast iron production. Compared to using a hydraulic cylinder + hydraulic proportional valve control + constant velocity plate + encoder drive, this method not only significantly improves the control execution accuracy, thereby increasing the product qualification rate, but also saves energy and reduces consumption, greatly reducing maintenance costs and reducing hydraulic pollution. Attached Figure Description

[0023] Figure 1 This is a front view of the cast iron pipe casting device with automatically adjustable pouring volume provided by this utility model;

[0024] Figure 2 This is a side view of the cast iron pipe casting device with automatically adjustable pouring volume provided by this utility model;

[0025] Figure 3This is a schematic diagram of the linkage drive mechanism provided by this utility model;

[0026] Figure 4 This is a schematic diagram illustrating the application of the cast iron pipe casting device with automatically adjustable pouring volume provided by this utility model.

[0027] Reference numerals in the attached drawings: 1. Molten iron sector ladle; 2. Connecting rod; 3. Ladle-turning frame; 4. Servo drive motor reducer; 5. Weighing sensor; 6. Base; 7. Casting trolley track support; 8. Casting trolley; 9. Ladle-turning frame; 10. Stream; 11. Drive shaft; 12. Large sector gear; 13. Small gear; 14. Tilting shaft; 15. Hinge arm; 16. First hinge shaft; 17. Second hinge shaft; 18. Third hinge shaft; 19. Centrifuge host. Detailed Implementation

[0028] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0029] like Figure 1-2 As shown in the figure, the present invention provides a cast iron pipe casting device with automatic adjustable pouring volume, including: a ladle-turning frame 3, a ladle-turning rack 9, a servo drive motor reducer 4, a pinion 13, a large sector gear 12, a linkage drive mechanism, and a molten iron sector ladle 1.

[0030] The upper end of the ladle-flipping frame 3 is rotatably equipped with a flipping shaft 14, and a ladle-flipping bracket 9 is fixedly installed on the flipping shaft 14; a molten iron fan-shaped ladle 1 is fixedly installed inside the ladle-flipping bracket 9. Specifically, a bushing is provided at the upper end of the ladle-flipping frame 3, through which the flipping shaft 14 is rotatably mounted. When the flipping shaft 14 rotates, the ladle-flipping bracket 9 and the molten iron fan-shaped ladle 1 can rotate around the axis of the flipping shaft 14 under the drive of the flipping shaft 14.

[0031] A servo drive motor reducer 4 is installed at the lower end of the bag-flipping frame 3. Both ends of the servo drive motor reducer 4 are connected to a transmission shaft 11. A pinion 13 is provided at the end of the transmission shaft 11, and the pinion 13 meshes with a large sector gear 12. The pinion 13 and the large sector gear 12 form a transmission mechanism for speed reduction and torque increase. The large sector gear 12 is hinged to the bag-flipping frame 3 via a first hinge shaft 16. The large sector gear 12 is also hinged to a linkage drive mechanism. The linkage drive mechanism is fixedly connected to a flipping shaft 14, and the linkage drive mechanism is fixed to the bag-flipping frame 9 via the flipping shaft 14. This utility model has two sets of pinions 13, large sector gears 12, and linkage drive mechanisms, located on both sides of the bag-flipping frame 3. The flipping shaft 14 can rotate under the action of the servo drive motor reducer 4, the pinion 13, the large sector gear 12 and the linkage drive mechanism. The rotation of the flipping shaft 14 drives the flipping frame 9 and the molten iron sector ladle 1 to rotate around the axis of the flipping shaft 14, which facilitates the pouring of molten iron in the molten iron sector ladle 1.

[0032] Multiple weighing sensors 5 are evenly distributed at the bottom of the bag-flipping frame 3. Specifically, the weighing sensors 5 can be set in four locations, distributed at the four corners of the bottom of the bag-flipping frame 3. The bag-flipping frame 3 is positioned above the base 6; the multiple weighing sensors 5 are located between the bottom of the bag-flipping frame 3 and the base 6.

[0033] like Figure 3 As shown, the linkage drive mechanism includes: a linkage 2 and a hinge arm 15; the bottom end of the linkage 2 is hinged to a large sector gear 12 via a second hinge shaft 17, and the top end of the linkage 2 is hinged to one end of the hinge arm 15 via a third hinge shaft 18; the other end of the hinge arm 15 is fixed to a flip shaft 14.

[0034] The distance between the centers of the first hinge shaft 16 and the second hinge shaft 17 is equal to the distance between the centers of the third hinge shaft 18 and the flipping shaft 14; the distance between the centers of the second hinge shaft 17 and the third hinge shaft 18 is equal to the distance between the centers of the first hinge shaft 16 and the flipping shaft 14. That is, the large sector gear 12, the connecting rod 2, and the hinge arm 15 form a parallelogram, with the centers of the flipping shaft 14, the first hinge shaft 16, the second hinge shaft 17, and the third hinge shaft 18 being the four vertices of the parallelogram. The linkage drive mechanism adopts a parallelogram structure, enabling the angular velocity of the rotation of the flipping frame 9 and the molten iron sector ladle 1 to be completely consistent with the angular velocity output by the servo drive motor reducer 4.

[0035] The flip-up frame 3 is located at the rear of the base 6, and a casting trolley track support 7 is installed on the front of the base 6. Two casting trolleys 8 that can move left and right are mounted on the track of the casting trolley track support 7. A flow channel 10 is installed at the front end of the casting trolley 8, and the flow channel 10 can enter the tube mold of the centrifuge host 19 and perform casting as the centrifuge host 19 moves. The two casting trolleys 8 that move left and right are used alternately.

[0036] In this invention, the servo drive motor 4 and multiple weighing sensors 5 are electrically connected to the control system and are controlled by the control system.

[0037] The working process of a cast iron pipe casting device with automatic adjustable pouring volume provided by this utility model:

[0038] like Figure 4 As shown, when the casting trolley 8 on one side finishes production, it moves to another side to flip the flow channel 10 and pour out the residual iron in the flow channel 10. The casting trolley 8 on the other side moves to the middle of the production position to start casting. During casting, the control system controls the servo drive motor reducer 4 to run at a constant angular velocity. Through the pinion 13, the large sector gear 12, and the connecting rod drive mechanism, the rotating shaft 14 is driven to rotate, which in turn drives the ladle frame 9 and the molten iron sector ladle 1 to rotate around the axis of the rotating shaft 14 at a constant angular velocity. The angular velocity of their rotation is exactly the same as the angular velocity output by the servo drive mechanism 4, so that the molten iron in the molten iron sector ladle 1 flows evenly and equally along the drop trough and flow channel 10 of the casting trolley 8 into the tube mold inside the high-speed rotating centrifugal host 11, which is equipped with spray cooling or water immersion cooling. At the same time, multiple weighing sensors 5 detect the changes in the molten iron in the molten iron sector ladle 1 in real time per unit time and feed them back to the control system. If the difference in the molten iron change exceeds the set range, the control system adjusts the output angular velocity of the servo drive mechanism 4 according to the set parameters to achieve precise adjustment and ensure that the amount of molten iron flowing out per unit time is consistent. This invention truly achieves full closed-loop control, making the actual amount of molten iron flowing out of the molten iron fan-shaped ladle 1 more uniform and equal per unit time. It avoids the situation where the actual amount of molten iron is not equal due to factors such as iron slag hanging in the molten iron fan-shaped ladle 1, thus greatly improving the qualified rate of cast iron production.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cast iron pipe casting device with automatically adjustable pouring volume, characterized in that, include: Flipping frame (3), flipping rack (9), servo drive motor reducer (4), pinion (13), large sector gear (12), linkage drive mechanism and molten iron sector ladle (1); The upper end of the flipping frame (3) is rotatably provided with a flipping shaft (14), and a flipping frame (9) is fixedly installed on the flipping shaft (14); a molten iron fan-shaped ladle (1) is fixedly installed inside the flipping frame (9). The lower end of the flip-bag frame (3) is equipped with a servo drive motor reducer (4); the two ends of the servo drive motor reducer (4) are respectively connected to the transmission shaft (11), and the end of the transmission shaft (11) is provided with a small gear (13), which meshes with a large sector gear (12). The large sector gear (12) is hinged to the flipping frame (3), and the large sector gear (12) is hinged to the linkage drive mechanism; the linkage drive mechanism is fixedly connected to the flipping shaft (14); Multiple weighing sensors (5) are evenly arranged at the bottom of the bag-turning frame (3).

2. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 1, characterized in that, The upper end of the flip frame (3) is provided with a bushing, through which the flip shaft (14) can be rotatably set.

3. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 1, characterized in that, The large sector gear (12) is hinged to the flip frame (3) via the first hinge shaft (16).

4. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 3, characterized in that, The linkage drive mechanism includes: a link (2) and a hinged arm (15). The bottom end of the connecting rod (2) is hinged to the large sector gear (12) through the second hinge shaft (17), and the top end of the connecting rod (2) is hinged to one end of the hinge arm (15) through the third hinge shaft (18); the other end of the hinge arm (15) is fixed to the flip shaft (14).

5. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 4, characterized in that, The distance between the centers of the first hinge (16) and the second hinge (17) is equal to the distance between the centers of the third hinge (18) and the flipping axis (14); The distance between the axes of the second hinge (17) and the third hinge (18) is equal to the distance between the axes of the first hinge (16) and the flip axis (14).

6. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 1, characterized in that, The flip-up frame (3) is positioned above the base (6); Multiple weighing sensors (5) are set between the bottom of the bag-turning frame (3) and the base (6).

7. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 1, characterized in that, The flip-bag frame (3) is located at the rear of the base (6), and the casting trolley track support (7) is installed on the front of the base (6). The track of the casting trolley track support (7) is equipped with two casting trolleys (8) that can move left and right.

8. The cast iron pipe casting device with automatically adjustable pouring volume according to claim 7, characterized in that, The casting trolley (8) has a flow channel (10) installed at the front end of the trough, and the flow channel (10) can penetrate into the tube mold of the centrifuge host (19).

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