Precoated sand pouring device

Abstract

The utility model relates to a precoated sand pouring device which comprises a plurality of air suction assemblies distributed on the top side of a pouring sand box in the circumferential direction, each air suction assembly comprises an exhaust fan and an air suction cover, each air suction cover is in a horn shape, the exhaust end of each exhaust fan is communicated with the small opening end of the corresponding air suction cover through a ventilation pipe, and the large opening end of each air suction cover is provided with a switchable air suction opening structure. The switchable air suction port structure comprises an electric louver installed at the large opening end of the air suction cover, in the first state, all louver blades of the electric louver are opened to form a large-area plane air suction port, and in the second state, part of fan blades of the electric louver are closed to form a round or oval centralized air suction port. According to the utility model, flexible switching between a large-area plane air suction port and a circular or elliptical centralized air suction port can be realized according to the actual distribution condition of hot air. When hot air is dispersed, the large-area plane air suction port can quickly suck a large amount of hot air, and the pertinence and efficiency of air suction are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of coated sand casting technology, and in particular to coated sand casting device. Background Technology

[0002] In the production process of coated sand casting for parts such as automotive engine rocker arms, a large amount of hot air is generated and discharged from the top of the negative pressure casting sand box. Patent CN218283639U discloses a coated sand negative pressure casting device, including a negative pressure casting sand box and stacked box-shaped shells disposed inside the negative pressure casting sand box. Three sets of stacked box-shaped shells are installed inside the negative pressure casting sand box, and multiple evenly distributed air suction hoods are fixedly connected to one side of the upper surface of the negative pressure casting sand box.

[0003] However, the air intake hoods in the aforementioned existing technologies usually have a fixed structure, making it difficult to effectively adjust them according to the actual distribution of hot air. This results in low air intake efficiency, and the temperature in the workshop may still rise due to the accumulation of hot air, affecting the working environment of the staff and production efficiency. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a coated sand casting device, the specific technical solution of which is as follows:

[0005] A coated sand casting device includes multiple air-suction components circumferentially distributed on the top side of the casting sand box. Each air-suction component includes an exhaust fan and an air-suction hood. The air-suction hood is trumpet-shaped. The exhaust end of the exhaust fan is connected to the small end of the air-suction hood through a vent pipe. The large end of the air-suction hood is provided with a switchable air-suction port structure. The switchable air-suction port structure includes an electric louver installed at the large end of the air-suction hood. The electric louver has at least two states. In the first state, all the louvers of the electric louver are opened to form a large-area planar air-suction port. In the second state, some of the louvers of the electric louver are closed to form a circular or elliptical centralized air-suction port.

[0006] Preferably, it also includes an adjustment assembly for driving the suction hood to tilt and rotate up and down. The adjustment assembly includes a base connected to the side of the sand casting box. A hydraulic cylinder and a connecting rod are installed on the top of the base. A base plate is fixedly connected to the bottom of the suction hood. A slide rail is installed on the bottom of the base plate. A slider is slidably connected to the bottom end of the slide rail. The output rod of the hydraulic cylinder is rotatably connected to the slider. The top end of the connecting rod is rotatably connected to the bottom of the base plate.

[0007] Preferably, the exhaust fan is mounted on the base, and the exhaust fan's outlet end is connected to an exhaust hose, which extends into a box filled with water.

[0008] Preferably, it also includes a controller and an airflow velocity sensor installed on the bottom side of the suction hood. The airflow velocity sensor is used to monitor the flow rate of hot air above the negative pressure casting sand box in real time. The airflow velocity sensor, the exhaust fan, the electric louvers and the hydraulic cylinder are all connected to the controller.

[0009] Preferably, the inner wall of the air intake hood body is provided with multiple guide ribs that extend spirally from the large opening end to the small opening end.

[0010] The beneficial effects of this utility model are:

[0011] 1. The motorized louvers at the large opening of the suction hood in this application allow for switching of the suction port structure, enabling flexible switching between a large-area planar suction port and a circular or elliptical concentrated suction port based on the actual distribution of hot air. When the hot air is dispersed, the large-area planar suction port can quickly draw in a large amount of hot air; when the hot air is concentrated, the concentrated suction port can enhance local suction, accurately capture the hot air, and greatly improve the targeting and efficiency of the suction.

[0012] The spiral guide ribs on the inner wall of the main body of the suction hood can guide the hot air to form a spiral airflow, accelerate the flow of hot air towards the small opening, reduce the residence time of hot air in the suction hood, further improve the suction efficiency, and ensure that the hot air can be efficiently extracted by the exhaust fan.

[0013] 2. Through efficient air intake components and a rational structural design, the system can effectively and promptly extract the large amount of hot air generated during the casting of coated sand, significantly reducing the accumulation of hot air in the workshop and thus effectively controlling the rise in workshop temperature. Compared with traditional equipment, it creates a relatively cool and comfortable working environment for staff, improving their work comfort and efficiency.

[0014] 3. The adjustment component can drive the suction hood to tilt and rotate up and down, dynamically adjusting the position and angle of the suction hood according to the rising direction and distribution height of the hot air. Regardless of changes in the generation and distribution of hot air, the device can quickly adapt and always maintain the optimal suction posture, greatly enhancing the device's adaptability to different working conditions and ensuring stable and efficient operation under various production conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the air intake component in this utility model.

[0017] Reference numerals: 1. Sand casting box; 2. Suction assembly; 20. Base; 21. Exhaust fan; 22. Exhaust hose; 23. Vent pipe; 24. Suction hood; 25. Spiral guide; 26. Large opening end; 27. Electric louver; 28. Base plate; 281. Slide rail; 29. ​​Hydraulic cylinder; 291. Slider; 292. Connecting support rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present 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 illustrative of the present utility model and are not intended to limit the present utility model.

[0019] Example

[0020] Please refer to Figures 1-2 The coated sand casting device of this utility model mainly consists of a casting sand box 1 and air suction components 2. The air suction components 2 are circumferentially distributed on the top side of the casting sand box 1, and the number is reasonably determined according to the size of the sand box and actual production needs, typically 3-6. This distribution method can comprehensively cover the area above the sand box, ensuring that heat generated in different directions can be captured in a timely manner. For example, by setting one air suction component 2 at each of the four corners and the midpoint of each of the four sides of a large sand box, efficient collection of heat from above the sand box can be achieved, avoiding dead zones in air suction.

[0021] Specifically, the suction assembly 2 includes a fan 21 and a suction hood 24. The suction hood 24 is trumpet-shaped, and the diameter of its larger opening 26 is typically 2-5 times the diameter of its smaller opening. This design can effectively expand the suction range. For example, when the diameter of the smaller opening is 10 cm, the diameter of the larger opening 26 can be designed to be 30 cm, increasing the heat collection area while ensuring suction power.

[0022] The exhaust end of the exhaust fan 21 is connected to the small opening end of the suction hood 24 through the vent pipe 23. The vent pipe 23 is made of a flexible material that is resistant to high temperature and corrosion, such as silicone tube. Its inner diameter is reasonably selected according to the power of the exhaust fan 21 and the size of the suction hood 24, generally between 8-15 cm, to ensure smooth airflow.

[0023] Specifically, the large opening 26 of the suction hood 24 is equipped with a switchable suction port structure, the core component of which is the motorized louver 27. The motorized louver 27 has at least two states. In the first state, all the slats of the motorized louver 27 are fully opened to form a large-area planar suction port. At this time, the suction port area can reach 80%-100% of the area of ​​the large opening 26, which is suitable for situations where hot air is evenly distributed over a large area above the sand box, and can quickly draw in a large amount of hot air.

[0024] In the second state, which can be achieved using an existing motorized louver structure, a circular or elliptical concentrated air intake is formed by closing part of the blades of the motorized louver 27. The diameter of the circular air intake is generally 40%-60% of the diameter of the larger end 26, while the major axis of the elliptical air intake can be between 50%-70% of the diameter of the larger end 26, and the minor axis can be between 30%-50% of the diameter of the larger end 26. This concentrated air intake can enhance the suction force in a localized area when hot air is concentrated, thereby improving the air intake efficiency.

[0025] Specifically, this device is also equipped with an adjustment assembly for tilting and rotating the suction hood 24 vertically. The base 20 of the adjustment assembly is securely bolted to the side of the sand casting box 1, and is made of high-strength steel, possessing sufficient load-bearing capacity and stability. A hydraulic cylinder 29 and a connecting rod are mounted on the top of the base 20. The cylinder body of the hydraulic cylinder 29 is fixed to the base 20 by welding or bolting, and its stroke is determined according to the required adjustment angle range of the suction hood 24 and the height of the sand casting box, generally between 20-50 cm.

[0026] Specifically, a base plate 28 is fixedly connected to the bottom of the suction hood 24. A slide rail 281 is installed at the bottom of the base plate 28. The slide rail 281 is a high-precision linear guide, and its length is designed according to the adjustment range of the suction hood 24, usually between 30-60 cm. A slider 291 is slidably connected to the bottom end of the slide rail 281. The slider 291 is rotatably connected to the output rod of the hydraulic cylinder 29 through a pin. The top end of the connecting support rod is rotatably connected to the bottom of the base plate 28 through a spherical bearing. When the hydraulic cylinder 29 extends or retracts, it pushes the slider 291 to slide on the slide rail 281. At the same time, under the synergistic action of the connecting support rod, the suction hood 24 tilts and rotates up and down around the connection point between the connecting support rod and the base plate 28. The rotation angle range can reach 0-60 degrees, thereby enabling precise adjustment of the position and angle of the suction hood 24 according to the rising direction and height of the hot air, ensuring the best suction effect.

[0027] Specifically, the exhaust fan 21 is mounted on the base 20 and connected to the base 20 via a shock-absorbing pad to reduce vibration and noise during operation. The exhaust fan 21 has an exhaust hose 22 connected to its outlet end. The exhaust hose 22 is made of fire-resistant, high-temperature resistant plastic or rubber material, and its length is determined according to the workshop layout and the location of the water tank. The exhaust hose extends into the water-filled tank. The volume of the water tank is designed according to the exhaust volume of the exhaust fan 21 and the requirements for heat treatment, generally between 0.5 and 2 cubic meters. The water in the tank can be replaced periodically or circulated for cooling. Through the evaporation and heat transfer of the water, the extracted hot air is cooled and purified, effectively reducing the impact of heat emissions on the workshop environment.

[0028] It also includes a controller and an airflow velocity sensor installed on the bottom side of the suction hood 24. The airflow velocity sensor adopts an existing high-precision thermal anemometer, with a measurement accuracy of ±0.1m / s, which can accurately monitor the flow velocity of the hot air above the negative pressure casting sand box 1 in real time.

[0029] The airflow velocity sensor, exhaust fan 21, electric louver 27, and hydraulic cylinder 29 are all connected to the controller. The controller adopts a programmable logic controller (PLC). Through preset control programs and algorithms, based on the data fed back by the airflow velocity sensor, it controls the speed of the exhaust fan 21 to be dynamically adjusted between 1000-3000 rpm, the opening and closing state of the electric louver 27, and the extension and retraction of the hydraulic cylinder 29, so as to realize the automated and efficient operation of the entire device and improve the device's adaptability to different working conditions and the efficiency of handling hot air.

[0030] The inner wall of the main body of the suction hood 24 is provided with multiple guide ribs extending spirally from the large opening end 26 to the small opening end. The number of ribs is generally 4-8, and the height is between 2-5 cm. The cross-sectional shape can be triangular or semi-circular. The guide ribs can guide the hot air to form a stable spiral airflow inside the suction hood 24, accelerate the flow of hot air towards the small opening end, reduce the residence time of hot air inside the suction hood 24, improve the suction efficiency and extraction effect, and allow the hot air to be extracted more smoothly by the exhaust fan 21.

[0031] In the actual installation process, the base 20 is first accurately installed at the predetermined position on the side of the sand casting box 1 using bolts. Then, the suction hood 24 is welded to the base plate 28 or connected with high-strength bolts to ensure a tight and stable connection. Next, the slide rail 281 and slider 291 are installed, and an appropriate amount of lubricant is applied to the slider 291 to allow it to slide smoothly on the slide rail 281. The output rod of the hydraulic cylinder 29 is connected to the slider 291 via a pin, and the cylinder body of the hydraulic cylinder 29 is fixed to the base 20. The two ends of the connecting rod are rotatably connected to the base 20 and the base plate 28 respectively, completing the installation of the adjustment assembly. Afterwards, the exhaust fan 21 is installed on the base 20 and fixed with shock-absorbing pads and bolts. The vent pipe 23 is connected between the exhaust end of the exhaust fan 21 and the small opening end of the suction hood 24, ensuring a tight and leak-free connection. An electric louver 27 is installed on the large opening end 26 of the suction hood 24 and electrically connected to the controller. Finally, an airflow velocity sensor is installed on the bottom side of the intake hood 24 and connected to the controller to complete the assembly of the entire device.

[0032] Working Principle: After the coating sand pouring operation begins, hot air is rapidly discharged from the upper part of the negative pressure sand casting box 1. At this time, the airflow velocity sensor installed on the bottom side of the suction hood 24 immediately starts working, monitoring the flow rate and direction of the hot air in real time at a frequency of 1-5 times per second, and transmitting this data to the controller. The controller's built-in microprocessor performs rapid data analysis and processing. When it detects that the hot air is distributed over a relatively uniform large area above the sand box, the controller sends a control signal to the electric louvers 27, causing the louvers to open fully, forming a large-area planar air intake. Simultaneously, based on the rising height and velocity information of the hot air, the controller calculates the optimal tilt angle required for the suction hood 24 and sends a corresponding extension and retraction command to the hydraulic cylinder 29. The hydraulic cylinder 29 drives the slider 291 to slide on the slide rail 281 according to the command, driving the connecting support rod to rotate, thereby adjusting the suction hood 24 to a suitable tilt angle. Then, the controller starts the exhaust fan 21, which runs at an appropriate speed to begin extracting the hot air. After entering the suction hood 24, the hot air is guided by the spiral guide ribs to form a spiral airflow, which accelerates towards the small opening. It is then drawn out by the exhaust fan 21 through the vent pipe 23 and finally discharged into a water-filled chamber through the exhaust hose 22. The water inside the chamber partially evaporates under the influence of the hot air, absorbing heat and thus cooling and purifying the hot air. After reducing the temperature and pollutant content of the hot air, it is discharged outside the workshop or subjected to further treatment.

[0033] When the airflow velocity sensor detects that hot air is concentrated in certain localized areas above the sand box, the controller controls the motorized louvers 27 to close some of the fan blades, creating an air intake, and increases the speed of the exhaust fan 21 to enhance the suction of the concentrated hot air. Simultaneously, the angle of the suction hood 24 is quickly adjusted to face the concentrated hot air area, ensuring efficient air intake. Throughout the production process, the controller continuously and dynamically adjusts the operating status of each component based on data from the airflow velocity sensor, maintaining optimal air intake at all times. This effectively reduces the accumulation of hot air and temperature rise in the workshop, creating a good working environment for workers and ensuring production efficiency and product quality.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A film-coated sand casting device, characterized in that, The system includes multiple air-suction components circumferentially distributed on the top side of the casting sand box. Each air-suction component includes an exhaust fan and an air-suction hood. The air-suction hood is trumpet-shaped. The exhaust end of the exhaust fan is connected to the small end of the air-suction hood through a vent pipe. The large end of the air-suction hood is provided with a switchable air-suction port structure. The switchable air-suction port structure includes an electric louver installed at the large end of the air-suction hood. The electric louver has at least two states. In the first state, all the slats of the electric louver are opened to form a large-area planar air-suction port. In the second state, some of the slats of the electric louver are closed to form a centralized air-suction port.

2. The coated sand casting device according to claim 1, characterized in that: It also includes an adjustment assembly for driving the suction hood to tilt and rotate up and down. The adjustment assembly includes a base connected to the side of the sand casting box. A hydraulic cylinder and a connecting rod are installed on the top of the base. A base plate is fixedly connected to the bottom of the suction hood. A slide rail is installed on the bottom of the base plate. A slider is slidably connected to the bottom end of the slide rail. The output rod of the hydraulic cylinder is rotatably connected to the slider. The top end of the connecting rod is rotatably connected to the bottom of the base plate.

3. The coated sand casting device according to claim 2, characterized in that: The exhaust fan is mounted on the base, and the exhaust fan's outlet end is connected to an exhaust hose.

4. The coated sand casting device according to claim 3, characterized in that: It also includes a controller and an airflow velocity sensor installed on the bottom side of the suction hood. The airflow velocity sensor is used to monitor the flow rate of hot air above the negative pressure casting sand box in real time. The airflow velocity sensor, the exhaust fan, the electric louvers and the hydraulic cylinder are all connected to the controller.

5. The coated sand casting device according to claim 4, characterized in that: The inner wall of the air intake hood is provided with multiple guide ribs that extend spirally from the large opening end to the small opening end.

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