Cooling device for lost foam casting

Abstract

The utility model discloses a cooling device for lost foam casting, including sand box, the rear of sand box is provided with helical flow guide type cooling mechanism, and the below of sand box is provided with level material mechanism, the inside of material conveying pipeline is equipped with material conveying helical blade, and the middle part of material conveying helical blade is installed with helical axle, and the helical axle of material conveying helical blade middle part is connected with motor drive, and the hopper is fixed in sand box bottom end and is communicated to material conveying pipeline bottom end through recovery pipeline, and the electric control valve is fixedly installed in recovery pipeline, and the heat dissipation aluminum sheet penetrates sand box inner and outer wall, and the level material mechanism includes first vibrating motor, second vibrating motor, spring body and support seat, and first vibrating motor and second vibrating motor are symmetrically installed in sand box bottom and are connected with support seat through spring body, and the cooling device for lost foam casting is through the synergic effect of mechanical circulation and vibration dispersion, and the two big technical problems of casting stress deformation and sand layer bonding caused by sandstone uneven cooling are solved simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting, specifically a cooling device for lost foam casting. Background Technology

[0002] Lost foam casting (also known as solid casting) is a new type of casting process in which a model made of foam plastic is made that is completely identical to the casting. After being coated with refractory paint and dried, the model is embedded in dry quartz sand and vibrated to shape it. Molten metal is then poured in under negative pressure, causing the model to vaporize and disappear and be replaced by the molten metal, ultimately forming the casting.

[0003] Patent application CN202421792455.7 discloses a cooling device for lost foam casting, which "includes a box body, a storage cavity inside the box body, a first cavity inside the box body, two sets of second cavities symmetrically opened inside the box body, and several sets of third cavities symmetrically arranged inside the box body. The two sets of second cavities are symmetrically arranged with the top central axis of the storage cavity as the center. Several sets of servo motors are equally spaced at the top edge of the box body. The output ends of the several sets of servo motors all pass through the box body and are connected to connecting rods. Each set of connecting rods is located in one of the second cavities. A set of fan blades is installed at the end of each set of connecting rods away from the servo motors. Each set of fan blades is positioned..." Within one of the third cavities. This embodiment improves cooling efficiency and reduces the cooling time of the casting. Based on the search of the aforementioned patents and combined with the existing lost foam casting process, it was found that the bottom sand stone has a lower cooling efficiency than the top sand stone because it continuously absorbs heat from the casting and lacks an active heat dissipation path. This uneven heating and cooling phenomenon causes two problems: the solidification rate of the bottom of the casting is significantly slower than that of the top and the bottom sand stone is overheated and sticking together. The difference in metal shrinkage in the casting generates internal stress, leading to warping or dimensional deviations in the casting; the overheated sticking of the bottom sand stone hinders uniform shrinkage of the casting, further aggravating the risk of deformation, and ultimately causing a significant increase in the scrap rate. Based on this, this utility model designs a cooling device for lost foam casting to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a cooling device for lost foam casting to solve the problems mentioned in the background art.

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

[0006] A cooling device for lost foam casting includes a sand box, a spiral flow cooling mechanism at the rear of the sand box, and a leveling mechanism at the bottom of the sand box. The spiral flow cooling mechanism includes a conveying pipe, conveying spiral blades, a motor, a discharge pipe, a hopper, a recovery pipe, an electrically controlled valve, a machine support, and heat dissipation aluminum fins. The conveying pipe has conveying spiral blades inside, and a spiral shaft is installed in the middle of the conveying spiral blades. The spiral shaft in the middle of the conveying spiral blades is connected to the motor for transmission. The hopper is fixed to the bottom of the sand box and connected to the bottom of the conveying pipe through the recovery pipe. The electrically controlled valve is fixedly installed in the recovery pipe. The heat dissipation aluminum fins penetrate the inner and outer walls of the sand box. The leveling mechanism includes a first vibration motor, a second vibration motor, a spring body, and a support base. The first and second vibration motors are symmetrically installed at the bottom of the sand box and connected to the support base through the spring body.

[0007] Optionally, the conveying spiral blades are driven by an electric motor to form a bottom-up circulation path for the sand body.

[0008] Optionally, multiple sets of heat dissipation aluminum fins are evenly distributed on the sand box, with the embedded portions of the heat dissipation aluminum fins distributed on the inner wall of the sand box and the exposed portions of the heat dissipation aluminum fins distributed on the outer wall of the sand box.

[0009] Optionally, the vibration frequency of the first and second vibration motors of the flat material mechanism is adjustable in the range of 50-100Hz, and the elastic coefficient of the spring body is 5-8N / mm.

[0010] Optionally, the electrically controlled valve is a pneumatic butterfly valve, and the discharge pipe is fixedly connected to the upper end of the conveying pipe and aligned with the sand box.

[0011] Optionally, the machine body support is fixed to the rear end of the material conveying pipe.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, a spiral flow cooling mechanism is provided, which forcibly establishes a vertical circulation path for the sand body through the conveying spiral blades. Combined with the bidirectional heat conduction of the heat dissipation aluminum fins, it completely breaks the static heat dissipation mode of the traditional sand box, so that the overheated sand body at the bottom obtains an active heat dissipation channel, and the overall cooling uniformity of the casting is greatly improved.

[0014] 2. In this utility model, a material leveling mechanism is provided, and a composite vibration system consisting of a dual vibration motor and a spring body is provided. This can not only eliminate the porosity of the sand layer, but also avoid the decrease in air permeability caused by excessive compaction of sand particles, thus effectively improving the casting success rate. Attached Figure Description

[0015] Figure 1 This is a three-dimensional front view structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model from a frontal view.

[0017] Figure 3 This is a three-dimensional, bottom-view structural diagram of the present invention;

[0018] Figure 4 This is a schematic diagram of the three-dimensional rear view structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of this utility model from a left-side plan view;

[0020] Figure 6 This is a three-dimensional sectional view of the structure of this utility model. Figure 1 ;

[0021] Figure 7 This is a three-dimensional sectional view of the structure of this utility model. Figure 2 ;

[0022] Figure 8 This is a three-dimensional sectional view of the structure of this utility model. Figure 3 .

[0023] In the diagram: 1. Sand box; 2. Spiral guide cooling mechanism; 201. Material conveying pipe; 202. Material conveying spiral blades; 203. Electric motor; 204. Discharge pipe; 205. Feed hopper; 206. Recycling pipe; 207. Electrically controlled valve; 208. Machine body support; 209. Heat dissipation aluminum fins; 3. Leveling mechanism; 301. First vibration motor; 302. Second vibration motor; 303. Spring body; 304. Support base. Detailed Implementation

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] 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 based on the specific circumstances.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-8 In this embodiment of the present invention, a cooling device for lost foam casting includes a sand box 1, a spiral guide cooling mechanism 2 is provided behind the sand box 1, and a leveling mechanism 3 is provided below the sand box 1; the spiral guide cooling mechanism 2 includes a conveying pipe 201, a conveying spiral blade 202, a motor 203, a discharge pipe 204, a discharge hopper 205, a recovery pipe 206, an electric control valve 207, a machine body support 208, and heat dissipation aluminum fins 209. The conveying pipe 201 is provided with a conveying spiral blade 202 inside, and a spiral shaft is installed in the middle of the conveying spiral blade 202. The shaft is connected to the motor 203 for transmission. The discharge pipe 204 is fixedly connected to the upper end of the conveying pipe 201 and aligned with the sand box 1. The hopper 205 is fixed to the bottom end of the sand box 1 and is connected to the bottom end of the conveying pipe 201 through the recycling pipe 206. The electric control valve 207 is fixedly installed on the recycling pipe 206. The heat dissipation aluminum fin 209 penetrates the inner and outer walls of the sand box 1. The leveling mechanism 3 includes a first vibration motor 301, a second vibration motor 302, a spring body 303 and a support base 304. The first vibration motor 301 and the second vibration motor 302 are symmetrically installed at the bottom of the sand box 1 and connected to the support base 304 through the spring body 303.

[0028] Sand circulation path: The motor 203 drives the conveying screw blades 202 to rotate, drawing the hot sand collected at the bottom of the sand box 1 through the discharge hopper 205 into the conveying pipe 201 through the recovery pipe 206. The electric control valve 207 controls the amount of sand returning. After the hot sand is lifted to the top along the conveying screw blades 202, it is sprayed onto the upper layer of the sand box 1 through the discharge pipe 204, forming a closed-loop cooling cycle.

[0029] Enhanced heat dissipation: Multiple sets of heat dissipation aluminum fins 209 are evenly embedded in the inner wall of the sand box 1. The embedded part directly contacts the sand body to conduct heat, while the exposed part dissipates heat through air convection.

[0030] Vibration parameters of the leveling mechanism 3: The first vibration motor 301 and the second vibration motor 302 are symmetrically installed on both sides of the bottom of the sand box 1. The frequency is adjusted to 50-100Hz by the frequency converter, and the amplitude is 0.5-2mm. The spring body 303 (elastic coefficient 5-8N / mm) and the support base 304 constitute a vibration damping system, so that the sand box 1 generates three-dimensional micro-amplitude vibration.

[0031] Sand layer treatment: The porosity of the sand body is greatly reduced under vibration, and at the same time, the hot sand at the bottom flows to the recovery pipe 206 to avoid local overheating.

[0032] The working principle of this utility model is as follows: The cooling device for lost foam casting achieves dynamic circulation cooling of the sand body through the synergistic action of the spiral flow cooling mechanism 2 and the leveling mechanism 3. During operation, the motor 203 drives the conveying spiral blades 202 to rotate, continuously conveying the hot sand sucked in from the bottom of the sand box 1 through the hopper 205 and the recovery pipe 206 to the top of the conveying pipe 201, and then evenly spraying it onto the upper layer of the sand box 1 through the discharge pipe 204; at the same time, the heat dissipation aluminum fins 209 conduct heat from the inner wall of the sand box 1 to the outer wall for dissipation. The first vibration motor 301 and the second vibration motor 302 of the leveling mechanism 3 drive the sand box 1 at a frequency of 50-100Hz, causing the spring body 303 to vibrate elastically, which promotes the dense filling of the sand body and assists the hot sand to flow back through the recovery pipe 206 controlled by the electronically controlled valve 207.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for lost foam casting, comprising a sand box (1), characterized in that: A spiral flow cooling mechanism (2) is provided behind the sand box (1), and a leveling mechanism (3) is provided below the sand box (1). The spiral flow cooling mechanism (2) includes a conveying pipe (201), a conveying spiral blade (202), a motor (203), a discharge pipe (204), a hopper (205), a recovery pipe (206), an electric control valve (207), a machine body support (208), and heat dissipation aluminum fins (209). The conveying pipe (201) is provided with a conveying spiral blade (202), and a spiral shaft is installed in the middle of the conveying spiral blade (202). The feeding hopper (205) is fixed to the bottom of the sand box (1) and connected to the bottom of the conveying pipe (201) through the recycling pipe (206). The electric control valve (207) is fixedly installed on the recycling pipe (206). The heat dissipation aluminum fin (209) penetrates the inner and outer walls of the sand box (1). The leveling mechanism (3) includes a first vibration motor (301), a second vibration motor (302), a spring body (303), and a support base (304). The first vibration motor (301) and the second vibration motor (302) are symmetrically installed at the bottom of the sand box (1) and connected to the support base (304) through the spring body (303).

2. The cooling device for lost foam casting according to claim 1, characterized in that: The conveying spiral blades (202) are driven by an electric motor (203) to form a bottom-up circulation path for the sand body.

3. A cooling device for lost foam casting according to claim 1, characterized in that: Multiple sets of heat dissipation aluminum fins (209) are evenly distributed on the sand box (1). The embedded part of the heat dissipation aluminum fins (209) is distributed on the inner wall of the sand box (1), and the exposed part of the heat dissipation aluminum fins (209) is distributed on the outer wall of the sand box (1).

4. A cooling device for lost foam casting according to claim 1, characterized in that: The vibration frequency of the first vibration motor (301) and the second vibration motor (302) of the flat material mechanism (3) is adjustable in the range of 50-100Hz, and the elastic coefficient of the spring body (303) is 5-8N / mm.

5. A cooling device for lost foam casting according to claim 1, characterized in that: The electrically controlled valve (207) is a pneumatic butterfly valve, and the discharge pipe (204) is fixedly connected to the upper end of the conveying pipe (201) and aligned with the sand box (1).

6. A cooling device for lost foam casting according to claim 1, characterized in that: The machine body support (208) is fixed to the rear end of the material conveying pipe (201).

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