Multifunctional sand temperature regulator suitable for casting sand

Abstract

The invention discloses a multifunctional sand temperature regulator suitable for casting sand. Comprising an air bellow, an air distribution chamber, a plurality of cooling boxes and a draught hood which are sequentially arranged and communicate with one another. An air inlet is formed in one side of the air bellow, a fan is arranged in the air bellow, an inlet of the fan is formed in the air inlet, an outlet of the fan is communicated with the air distribution chamber, a dust opening is formed in the draught hood, a sand inlet pipe is arranged on one side of the air distribution chamber, and a sand outlet pipe is arranged on the cooling box. The air cap is arranged in the air distribution chamber, hot sand is fluidized, in the fluidization process, impurities with large density are deposited in the air distribution chamber and can be cleaned regularly, sand grains move upwards in the fluidization state, and the content of the impurities in the sand is reduced; in the fluidization rising process of hot sand, fine dust is brought into the dust remover in the draught hood by airflow to be discharged out of equipment, so that the content of the dust in the sand is reduced, the follow-up casting process is facilitated, and the working environment is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of used sand regeneration, and particularly relates to a multifunctional sand temperature regulator applicable to foundry sand. Background Art

[0002] China's casting output has ranked first in the world for many consecutive years. With the increasingly fierce competition in the international and domestic markets, foundry enterprises adopt new technologies and new equipment to improve product quality and reduce production costs. The proportion of castings produced by V-method casting, lost foam casting, and resin sand casting is increasing; with the increasing environmental protection requirements and the reduction of foundry sand resources, used sand regeneration is becoming more and more popular. The multifunctional sand temperature regulator invented by us can meet the needs of these several productions;

[0003] In the field of hot sand cooling and treatment, there are many drawbacks in existing equipment, which are difficult to meet the production requirements of high efficiency and precision. On the one hand, existing equipment mostly adopts complex structures, with cumbersome assembly and numerous moving parts, resulting in a huge amount of daily maintenance work, frequent failures, and seriously affecting production efficiency. For example, in some vibrating screen type equipment, many components such as springs and eccentric wheels are not only easily worn, but also need to be lubricated and replaced regularly. Slight negligence will cause shutdown failures and increase maintenance costs. On the other hand, the separation effect of impurities in sand by traditional equipment is poor, and heavy impurities with a density greater than that of sand are often mixed in, affecting the purity and performance of sand. In foundry sand, the mixing of heavy impurities will cause defects such as sand inclusion and porosity in castings, reducing the quality of castings. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a multifunctional sand temperature regulator applicable to foundry sand to solve this problem.

[0005] To achieve the above object, the present application provides the following technical solutions:

[0006] A multifunctional sand temperature regulator applicable to foundry sand includes an air box, a air distribution chamber, a plurality of cooling boxes, and an exhaust hood that are arranged in sequence and communicate with each other; an air inlet is provided on one side of the air box, a fan is arranged in the air box, the fan inlet is arranged at the air inlet, the fan outlet is communicated with the air distribution chamber, a dust port is provided on the exhaust hood, a sand inlet pipe is arranged on one side of the air distribution chamber, and a sand outlet pipe is arranged on the cooling box.

[0007] It is further set that: a plurality of evenly arranged air caps are arranged in the air distribution chamber.

[0008] It is further set that: a cooling pipe group is arranged in each cooling box, and a connecting pipe is arranged between each group of the cooling pipe groups.

[0009] It is further set that: the connecting pipe is set as a U shape, and a plurality of the connecting pipes are arranged in a left-right staggered manner.

[0010] Further set as: The cooling pipe group includes a plurality of water pipes crossing the cooling box, and the plurality of water pipes are arranged in a rectangular uniform array.

[0011] Further set as: One side of the cooling pipe group at the bottommost part is provided with a water outlet, and one side of the cooling pipe group at the topmost part is provided with a water inlet; the sand discharge pipe is arranged in the cooling box at the uppermost side.

[0012] Further set as: The sand inlet pipe includes an upper long pipe and an inclined pipe communicated therewith, and the inclined pipe inclines downward along the direction from outside to inside.

[0013] Further set as: The air extraction hood is set as an inverted funnel shape.

[0014] Further set as: A movable side plate is installed on the side surface of the air distribution chamber through bolts.

[0015] Further set as: It further includes a frequency converter for controlling the fan.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0017] 1. The present invention sets air caps in the air distribution chamber to fluidize the hot sand. During the fluidization process, impurities with a larger density are deposited in the air distribution chamber and can be cleaned regularly, while the sand grains move upward in the fluidized state, reducing the impurity content in the sand; during the upward movement of the fluidized hot sand, fine dust is carried into the dust collector in the air extraction hood by the air flow 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 in the cooling pipe group, fully contacts with the hot sand, and can effectively take away the heat of the hot sand to achieve efficient cooling of the hot sand; the heat exchange area between the cooling water and the hot sand is accurately calculated. By calculating parameters such as the required heat exchange amount 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 the cooling efficiency. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For Figure 1Cross-sectional view along line A-A in the middle;

[0022] Figure 3 It is a structural diagram of a wind cap.

[0023] 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 group; 11, connecting pipe; 12, water outlet; 13, water inlet; 14, water pipe; 15, dust exhaust port; 16, wind cap. Specific implementation manners

[0024] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Embodiment

[0028] Refer to Figures 1-3, a multifunctional sand temperature regulator applicable to foundry sand disclosed by the present invention, comprising an air box 1, an air distribution chamber 2, a plurality of cooling boxes 3, and an air extraction hood 4 which are arranged in sequence and communicate with each other. Among them, a sand inlet pipe 5 is arranged 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 communicated therewith. The inclined pipe 7 inclines downward along the direction from outside to inside. An outlet pipe 8 is provided on the uppermost cooling box 3, and the outlet pipe 8 is located below the air extraction hood 4 and inclines downward along the direction from inside to outside;

[0029] An air inlet 9 is provided on one side of the air box 1. A fan is arranged in the air box 1. The fan inlet is arranged at the air inlet 9, and the fan outlet is communicated with the air distribution chamber 2. The fan is used to form a negative pressure in the air box 1 so that the hot sand is introduced into the overall equipment under the action of the external air flow. When the fan operates, the low-pressure environment at its inlet prompts the hot sand to enter the air box 1 from the air inlet 9. Subsequently, the hot sand is driven by the air flow generated by the fan and sequentially flows through components such as the air distribution chamber 2 and the cooling boxes 3, enters the equipment for subsequent processing procedures, thereby realizing the circulation and cooling of the hot sand in the equipment.

[0030] A plurality of evenly arranged air caps 16 are arranged in the air distribution chamber 2. The air caps 16 are arranged 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 bed layer of the hot sand in the sand temperature regulator depends on the wind pressure and air volume generated by the fan. The height and horizontal cross-sectional area of the sand temperature adjustment can be determined according to the sand volume of the hot sand, the hot sand temperature, and the outlet sand temperature required by the process;

[0032] A cooling pipe group 10 is arranged in each cooling box 3. A connecting pipe 11 is arranged between each group of cooling pipe groups 10. In this embodiment, the connecting pipe 11 is arranged in a U shape, and a plurality of connecting pipes 11 are arranged in a left-right staggered manner. An outlet 12 is provided on one side of the lowermost cooling pipe group 10, and an inlet 13 is provided on one side of the uppermost cooling pipe group 10;

[0033] In this embodiment, the cooling pipe group 10 includes a plurality of water pipes 14 passing through the cooling box 3, and the plurality of water pipes 14 are arranged in a rectangular uniform array; the cooling water enters the cooling pipe group 10 from the upper inlet 13 and flows in an S-shaped curve from top to bottom, fully contacting the hot sand and taking away the heat of the hot sand to reduce the temperature of the hot sand;

[0034] In this embodiment, the air extraction hood 4 is arranged in an inverted funnel shape, and a dust discharge port 15 is provided above it, and a dust collector (not shown in the figure) is connected at the dust discharge port 15;

[0035] The cooling water enters the inside of the regulator from the water inlet 13 on the upper side and flows downward along the multiple water pipes 14 in the cooling tank 3 in an S-shaped curve. At the same time, the hot sand enters the air distribution chamber 2 through the sand inlet pipe 5, and the air caps 16 installed in the air distribution chamber 2 fluidize the hot sand flowing into the chamber;

[0036] In this embodiment, the cooling water flows from top to bottom, and the hot sand fluidized layer flows from bottom to top, resulting in better cooling effect; the dust in the sand in the sand temperature regulator is carried away by the air flow during the upward flow of the sand layer fluidization and finally discharged from the equipment through the dust outlet 15, which plays a role in reducing the dust content in the sand. During the process of fluidizing the hot sand in the air distribution chamber 2, substances with a larger density are deposited in the air distribution chamber 2, and the sand grains move upward in the fluidized state, thus reducing the impurity content in the sand and improving the sand quality. The side of the air distribution chamber 2 is installed with a movable side plate through bolts for regularly opening to clean the deposited impurities;

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

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

[0039] S100, calculate the heat exchange area F between the hot sand and the cooling water through the following steps:

[0040] S101, calculate the required heat exchange amount Q of the hot sand through the following formula:

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

[0042] S102, calculate the logarithmic mean temperature ΔT ln :

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

[0044] S103, calculate the heat exchange area F between the hot sand and the cooling water through 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] S200, the three parameters of the number n, diameter d, and length l of the water pipe need to satisfy the following relationship: F = ndl;

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

[0048] L = αSV; where α is an empirical constant with a value range of 1.0 - 1.3. Specifically, when the sand layer is static and its thickness is less than 300 mm, when its thickness is between 300 mm and 500 mm, the value of α is taken as 1.1 or 1.2, and when the thickness exceeds 500 mm, the value of α is taken as 1.3. S is the horizontal 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 value of the required wind pressure P is obtained by the following formula:

[0050] P = H / 67 + p; where H is the thickness of the sand layer 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 taken as 1.5, and when the thickness of the sand layer is greater than 350 mm, the value of p is taken as 2.5;

[0051] The working principle of the present invention is as follows:

[0052] The air inlet 9 of the air box 1 is connected to the fan. The hot sand entering the air distribution chamber 2 from the sand inlet pipe 5 becomes fluidized under the action of the air flow generated by the fan. As the hot sand is continuously added, the thickness of the fluidized layer continuously increases until it can be discharged from the sand outlet pipe 8 of the top cooling box 3. During the process of flowing upward from bottom to top, the fluidized layer contacts the water pipe 14 in the cooling box 3, and the heat of the hot sand is taken away by the water, thus achieving the effect of cooling;

[0053] During the upward movement of the fluidized sand layer, fine dust is carried away by the air flow and enters the dust collector connected to the top of the air extraction hood 4, which plays a role in reducing the dust content in the sand. During the process of fluidization of the hot sand in the air distribution chamber 2, substances with a larger density are deposited in the air distribution chamber 2, and the sand grains move upward in the fluidized state, thus reducing the impurity content in the sand and improving the quality of the sand.

[0054] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multifunctional sand temperature regulator applicable to foundry sand, characterized in that, It includes a bellows (1), an air distribution chamber (2), a plurality of cooling boxes (3), and an air extraction hood (4) which are arranged in sequence and communicate with each other; 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), and the fan outlet is communicated with the air distribution chamber (2). A dust port is provided on the air extraction 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, characterized in that 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, wherein Each cooling box (3) is provided with a cooling pipe group (10), and a connecting pipe (11) is arranged between each group of the cooling pipe groups (10).

4. The 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 a plurality of the connecting pipes (11) are arranged in a left-right staggered manner.

5. The multifunctional sand temperature regulator for foundry sand according to claim 4, characterized in that The cooling pipe group (10) includes a plurality of water pipes (14) passing through the cooling box (3) horizontally, and a plurality of the 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 pipe group (10) at the bottommost part, and an inlet (13) is provided on one side of the cooling pipe 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 foundry sand according to claim 1, characterized in that, The sand inlet pipe (5) includes an upper long pipe (6) and an inclined pipe (7) communicated with it, and the inclined pipe (7) inclines downward along the direction from outside to inside.

8. A multi-functional sand temperature regulator applicable to foundry sand according to claim 1, characterized in that, The air extraction hood (4) is arranged in an inverted funnel shape.

9. The multi-functional sand temperature regulator applicable to foundry sand according to claim 1, characterized in that, A movable side plate is installed on the side of the air distribution chamber (2) by bolts.

10. A multifunctional sand temperature regulator applicable to foundry sand according to claim 1, characterized in that, It also includes a frequency converter for controlling the fan.

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