A multi-functional sand temperature regulator suitable for foundry sand

Abstract

This utility model discloses a multifunctional sand temperature regulator suitable for foundry sand; it includes a wind box, an air distribution chamber, multiple cooling boxes, and an exhaust hood arranged sequentially and interconnected; the wind box has an air inlet on one side, a fan is installed inside the wind box with its inlet located at the air inlet, and its outlet connected to the air distribution chamber; the exhaust hood has a dust outlet, a sand inlet pipe is installed on one side of the air distribution chamber, and a sand outlet pipe is installed on the cooling boxes; this utility model installs an air cap in the air distribution chamber to fluidize the hot sand. During the fluidization process, denser impurities are deposited in the air distribution chamber and can be cleaned periodically, while sand particles move upward in the fluidized state, reducing the impurity content in the sand; during the upward fluidization process of the hot sand, fine dust is carried by the airflow into the dust collector in the exhaust hood and discharged, thereby reducing the dust content in the sand, which is beneficial to the subsequent casting process and also improves the working environment.

Description

Technical Field

[0001] This utility model relates to the field of recycled sand technology, and in particular to a multifunctional sand temperature regulator suitable for foundry sand. Background Technology

[0002] For many consecutive years, my country has ranked first in the world in casting output. With increasingly fierce competition in both international and domestic markets, casting enterprises are adopting new technologies and equipment to improve product quality and reduce production costs. The proportion of castings produced by V-process casting, lost foam casting, and resin sand casting is increasing. With environmental protection requirements and the depletion of foundry sand resources, the recycling of used sand is becoming more widespread. Our invented multi-functional sand temperature regulator can be used to meet the needs of these production methods.

[0003] In the field of hot sand cooling and processing, existing equipment has many drawbacks, making it difficult to meet the demands of efficient and precise production. On the one hand, existing equipment often employs complex structures, with cumbersome assembly and numerous moving parts, resulting in a huge workload for daily maintenance, frequent malfunctions, and a serious impact on production efficiency. For example, in some vibrating screen equipment, numerous springs, eccentric wheels, and other components are not only prone to wear but also require regular lubrication and replacement. Even slight negligence can lead to downtime and increased maintenance costs. On the other hand, traditional equipment has poor separation effects on impurities in sand, with heavier impurities than sand often mixed in, affecting the purity and performance of the sand. In foundry sand, for instance, the presence of heavy impurities can cause defects such as sand inclusions and porosity in castings, reducing casting quality. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a multifunctional sand temperature regulator suitable for foundry sand.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A multifunctional sand temperature regulator suitable for foundry sand includes a wind box, an air distribution chamber, multiple cooling boxes, and an exhaust hood arranged sequentially and interconnected. The wind box has an air inlet on one side, a fan is installed inside the wind box, the fan inlet is located at the air inlet, and the fan outlet is connected to the air distribution chamber. The exhaust hood has a dust outlet, a sand inlet pipe is installed on one side of the air distribution chamber, and a sand outlet pipe is installed on the cooling boxes.

[0007] The further configuration is as follows: the air distribution chamber is provided with multiple evenly arranged air caps.

[0008] The configuration is further defined as follows: each cooling box is equipped with a cooling pipe assembly, and each cooling pipe assembly is connected to the other two cooling pipe assemblies.

[0009] The connecting pipe is further configured as follows: the connecting pipe is U-shaped, and multiple connecting pipes are arranged alternately on the left and right.

[0010] Further configuration: The cooling pipe assembly includes multiple water pipes that traverse the cooling tank, and the multiple water pipes are arranged in a rectangular uniform array.

[0011] Further configuration: an outlet is provided on one side of the bottommost cooling pipe assembly, and an inlet is provided on one side of the topmost cooling pipe assembly; a sand outlet pipe is located in the topmost cooling box.

[0012] The sand inlet pipe is further configured such that: the upper part of the long pipe includes an inclined pipe connected thereto, and the inclined pipe is inclined downward in a direction from the outside to the inside.

[0013] A further setting is made: the exhaust hood is configured as an inverted funnel shape.

[0014] A further feature is provided: a movable side plate is bolted to the side of the air distribution chamber.

[0015] Further configuration includes: a frequency converter for controlling the fan.

[0016] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0017] 1. This utility model sets up an air cap in the air distribution chamber to fluidize the hot sand. During the fluidization process, the denser impurities are deposited in the air distribution chamber and can be cleaned periodically, while the sand particles move upward in the fluidized state, reducing the impurity content in the sand. During the fluidization and ascent of the hot sand, fine dust is carried by the airflow into the dust collector in the exhaust hood and discharged from the equipment, thereby reducing the dust content in the sand, which is beneficial to the subsequent casting process and also improves the working environment.

[0018] 2. The cooling water flows in an S-shaped curve within the cooling pipe assembly, making full contact with the hot sand and effectively removing the heat from the hot sand, thus achieving efficient cooling of the hot sand. The heat exchange area between the cooling water and the hot sand is precisely calculated. By calculating parameters such as the required heat exchange capacity of the hot sand, the logarithmic mean temperature, and the heat transfer coefficient of the cooling bed, it is ensured that the heat exchange area meets the cooling requirements, thereby improving cooling efficiency. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 For along Figure 1 Sectional view of line AA in the middle;

[0022] Figure 3 This is a structural diagram of the windproof cap.

[0023] Attached reference numerals: 1. Air box; 2. Air distribution chamber; 3. Cooling box; 4. Exhaust hood; 5. Sand inlet pipe; 6. Long pipe; 7. Inclined pipe; 8. Sand outlet pipe; 9. Air inlet; 10. Cooling pipe assembly; 11. Connecting pipe; 12. Water outlet; 13. Water inlet; 14. Water pipe; 15. Dust outlet; 16. Air cap. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Example

[0028] Reference Figures 1-3This utility model discloses a multi-functional sand temperature regulator suitable for foundry sand, which includes a wind box 1, an air distribution chamber 2, multiple cooling boxes 3, and an exhaust hood 4 arranged in sequence and connected to each other. A sand inlet pipe 5 is provided on one side of the air distribution chamber 2, and the sand inlet pipe 5 includes an upper long pipe 6 and an inclined pipe 7 connected to it. The inclined pipe 7 is inclined downward in a direction from the outside to the inside. A sand outlet pipe 8 is provided at the uppermost cooling box 3, and the sand outlet pipe 8 is located below the exhaust hood 4 and is inclined downward in a direction from the inside to the outside.

[0029] An air inlet 9 is provided on one side of the air box 1. A fan is installed inside the air box 1, with its inlet located at the air inlet 9 and its outlet connected to the air distribution chamber 2. The fan is used to create negative pressure inside the air box 1, causing hot sand to be introduced into the overall equipment under the action of external airflow. When the fan is running, the low-pressure environment at its inlet forces the hot sand to enter the air box 1 from the air inlet 9. Subsequently, driven by the airflow generated by the fan, the hot sand flows sequentially through the air distribution chamber 2, the cooling box 3, and other components before entering the equipment for subsequent processing, thereby realizing the circulation and cooling of the hot sand within the equipment.

[0030] Multiple uniformly arranged air caps 16 are provided in the air distribution chamber 2. The air caps 16 are used to fluidize the hot sand entering the air chamber.

[0031] In this embodiment, the fan is controlled by a frequency converter. The height of the fluidized layer of hot sand in the sand temperature regulator depends on the air pressure and air volume generated by the fan. The height and horizontal cross-sectional area of ​​the sand temperature regulator can be determined according to the amount of hot sand, the temperature of hot sand, and the required sand outlet temperature.

[0032] Each cooling box 3 is equipped with a cooling pipe group 10, and a connecting pipe 11 is provided between each cooling pipe group 10. In this embodiment, the connecting pipe 11 is U-shaped, and multiple connecting pipes 11 are arranged alternately from left to right. The cooling pipe group 10 at the bottom is provided with an outlet 12 on one side, and the cooling pipe group 10 at the top is provided with an inlet 13 on one side.

[0033] In this embodiment, the cooling pipe assembly 10 includes multiple water pipes 14 that cross the cooling box 3, and the multiple water pipes 14 are arranged in a rectangular uniform array; the cooling water enters the cooling pipe assembly 10 from the upper water inlet 13, flows in an S-shaped curve from top to bottom, and fully contacts the hot sand, carrying away the heat of the hot sand and reducing the temperature of the hot sand.

[0034] In this embodiment, the exhaust hood 4 is configured as an inverted funnel shape, with a dust discharge port 15 at its top, and a dust collector (not shown in the figure) is connected to the dust discharge port 15.

[0035] Cooling water enters the regulator from the upper inlet 13 and flows down in an S-shaped curve along multiple water pipes 14 in the cooling box 3. At the same time, hot sand enters the air distribution chamber 2 through the sand inlet pipe 5. The air cap 16 installed in the air distribution chamber 2 fluidizes the hot sand entering the air chamber.

[0036] In this embodiment, the cooling water flows from top to bottom, while the hot sand fluidized layer flows from bottom to top, resulting in better cooling. Dust in the sand within the sand temperature regulator is carried away by the airflow during the fluidization and ascent of the sand layer, and is ultimately discharged from the equipment through the dust outlet 15, thus reducing the dust content in the sand. During the fluidization process of the hot sand in the air distribution chamber 2, denser substances are deposited in the air distribution chamber 2, and the sand particles move upwards in the fluidized state, thereby reducing the impurity content in the sand and improving its quality. Movable side plates are bolted to the side of the air distribution chamber 2 for periodically opening and cleaning the deposited impurities.

[0037] In this embodiment, the selected sand grain parameters are as follows: particle size range 70-120 mesh, sand grain surface shape factor of 0.9, average sand grain diameter of 0.15 mm, and sand grain bulk density of 1400 kg / m³. 3 The density of the sand particles is 2330 kg / m³. 3 .

[0038] In this embodiment, the selection steps for water pipe 14 are as follows:

[0039] S100, the heat exchange area F between the hot sand and the cooling water is calculated using the following steps:

[0040] S101, the required heat exchange Q of the hot sand is calculated using the following formula:

[0041] Q = C 砂 GΔT1; where C 砂 ΔT1 is the specific heat of sand, taken as 0.71 J / (kg·℃), G is the amount of hot sand to be cooled per unit time (kg / s), and ΔT1 is the temperature difference of sand (℃).

[0042] S102, the logarithmic mean temperature ΔT is calculated using the following formula. ln :

[0043] Where ΔT2 is the temperature difference of the cooling water (°C);

[0044] S103, the heat exchange area F between the hot sand and the cooling water is calculated using the following formula:

[0045] F=Q(K / ΔT ln Where K is the heat transfer coefficient of the cooling bed, with a value of 191.67;

[0046] For S200, the three parameters—the number of water pipes n, the diameter d, and the length l—must satisfy the following relationship: F ​​= ndl;

[0047] In this embodiment, the formula for calculating the air volume L of the fan is as follows:

[0048] L = αSV; where α is an empirical constant, ranging from 1.0 to 1.3. Specifically, when the sand layer is stationary, its thickness is less than 300 mm, and when its thickness is between 300 mm and 500 mm, the value of α is 1.1 or 1.2. When the thickness exceeds 500 mm, the value of α is 1.3. S is the horizontal surface area of ​​the sand layer, and V is the wind speed that can pass through the fluidized bed sand layer, with a value of 0.12.

[0049] In this embodiment, the required wind pressure P is calculated using the following formula:

[0050] P = H / 67 + p; where H is the thickness of the sand layer when it is at rest, and p is an additional value. Specifically, when the thickness of the sand layer is less than 350 mm, the value of p is 1.5, and when the thickness of the sand layer is greater than 350 mm, the value of p is 2.5.

[0051] The working principle of this utility model is as follows:

[0052] The air inlet 9 of the air box 1 is connected to the fan. The hot sand enters the air distribution chamber 2 from the sand inlet pipe 5 and becomes fluidized under the action of the airflow generated by the fan. As hot sand is continuously added, the thickness of the fluidized layer increases until it can be discharged from the sand outlet pipe 8 of the top cooling box 3. The fluidized layer comes into contact with the water pipe 14 in the cooling box 3 during the upward flow. The heat of the hot sand is carried away by the water, thereby achieving the cooling effect.

[0053] During the ascent of the fluidized sand layer, fine dust particles are carried away by the airflow and enter the dust collector connected to the top of the exhaust hood 4, thus reducing the dust content in the sand. As the hot sand fluidizes within the air distribution chamber 2, denser substances deposit in the chamber, and the sand particles move upwards in a fluidized state, thereby reducing the impurity content and improving the sand's quality.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions 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 multifunctional sand temperature regulator applicable to foundry sand, characterized in that, It includes a bellows (1), an air distribution chamber (2), multiple cooling boxes (3), and an exhaust hood (4) that are sequentially arranged and interconnected; an air inlet (9) is provided on one side of the bellows (1), a fan is arranged in the bellows (1), the fan inlet is arranged at the air inlet (9), the fan outlet is connected to the air distribution chamber (2), a dust port is provided on the exhaust hood (4), a sand inlet pipe (5) is arranged on one side of the air distribution chamber (2), and a sand outlet pipe (8) is arranged on the cooling box (3).

2. The multifunctional sand temperature regulator applicable to foundry sand according to claim 1, wherein A plurality of uniformly arranged air caps (16) are arranged in the air distribution chamber (2).

3. The multifunctional sand temperature regulator applicable to foundry sand according to claim 1, characterized in that, Each cooling box (3) is provided with a cooling tube group (10), and a connecting pipe (11) is arranged between each group of the cooling tube groups (10).

4. A multifunctional sand temperature regulator applicable to foundry sand according to claim 3, characterized in that, The connecting pipe (11) is arranged in a U shape, and the multiple connecting pipes (11) are arranged in a left-right staggered manner.

5. The multifunctional sand temperature regulator applicable to foundry sand according to claim 4, characterized in that, The cooling tube group (10) includes multiple water pipes (14) that cross the cooling box (3), and the multiple water pipes (14) are arranged in a rectangular uniform array.

6. The multifunctional sand temperature regulator applicable to foundry sand according to claim 5, characterized in that, An outlet (12) is provided on one side of the cooling tube group (10) at the bottommost part, and an inlet (13) is provided on one side of the cooling tube group (10) at the topmost part; the sand outlet pipe (8) is arranged on the uppermost cooling box (3).

7. The multifunctional sand temperature regulator applicable to molding sand according to claim 1, wherein The sand inlet pipe (5) includes an upper long pipe (6) and an inclined pipe (7) connected thereto, and the inclined pipe (7) slopes downward along the direction from outside to inside.

8. A multifunctional sand temperature regulator applicable to foundry sand according to claim 1, characterized in that, The exhaust hood (4) is arranged in an inverted funnel shape.

9. The multifunctional sand temperature regulator applicable to foundry sand according to claim 1, wherein The side surface of the air distribution chamber (2) is installed with a movable side plate by bolts.

10. The multifunctional sand temperature regulator applicable to foundry sand according to claim 1, wherein It further includes a frequency converter for controlling the fan.

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