Casting machinery sand mixing device for electric furnace manufacturing

Abstract

The invention discloses a casting machinery sand mixing device for electric furnace manufacturing, which comprises a hopper type conveyor, a pre-mixing machine and a sand mixing machine which are progressively arranged along a molding sand treatment procedure, the hopper type conveyor is used for directionally conveying molding sand and comprises a rack, a conveying belt arranged on the inner side of the rack and a plurality of feeding hoppers arranged on the upper side of the rack, and the pre-mixing machine and the sand mixing machine are arranged on the rack. The discharging directions of the multiple feeding hoppers are distributed in a staggered mode. The premixing machine comprises an outer rack, a premixing conveying module and a spraying module, the outer rack is connected with a rack of the hopper type conveyor, and the premixing conveying module and the spraying module are arranged on the upper side and in the middle of the outer rack respectively; and the sand mixer comprises a sand mixer barrel, a lifting barrel, a receiving hopper, a gas ejector and a third driving device. Through the synergistic effect of the hopper type conveyor, the premixing machine and the sand mixing machine, the efficient and uniform sand mixing process is achieved, the problems of water-containing molding sand agglomeration, uneven sand mixing and the like are avoided, and the casting quality and the production efficiency are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric furnace casting processing, in particular to a casting mechanical sand mixing device for electric furnace manufacturing. BACKGROUND

[0002] In the field of casting process of electric furnace manufacturing, the sand mixing device is a key equipment to ensure the quality of the sand and then the quality of the castings. As the core material used to make the mold in the casting process, the performance of the sand directly determines the key indicators such as the dimensional accuracy, surface quality and internal structure of the castings. The sand mixing process is an important link to uniformly mix the sand, binder and other additives to give the sand good forming performance and specific physical and chemical properties.

[0003] For sand mixing devices such as the automatic sand mixing device for hardware casting disclosed in publication No. CN120133446A and the mold for resin sand casting disclosed in publication No. CN119566217A. These devices realize the basic function of sand mixing to some extent, but there are still obvious deficiencies when dealing with materials under special conditions. For example, in the casting production, due to factors such as environmental humidity, the materials absorb moisture. When dealing with such moisture-filled materials, the above-mentioned casting mechanical sand mixing device lacks effective dispersion and stirring mechanism, and the moisture in the materials will cause strong bonding force between the particles, causing some materials to easily form sand balls. For example, when the sand is mixed with the binder containing moisture, under the simple stirring action in the sand mixing device, it is difficult to uniformly disperse the moisture to the surface of each sand particle, but some sand particles will be gathered together to form lumps. These lumps are difficult to be fully dispersed and mixed uniformly in the subsequent sand mixing process, which seriously affects the uniformity of sand mixing. Uneven sand mixing will cause a series of serious quality problems. On the one hand, uneven sand mixing will cause inconsistent distribution of each component in the sand, and the performance of the sand in different areas will be different during the casting process. For example, the binder content is too high in some areas, while it is too low in other areas. This will cause uneven shrinkage of the castings during solidification, thereby increasing the probability of defects such as pores, sand holes, etc. in the castings. The existence of pores and sand holes will destroy the compactness of the castings, reduce the overall quality and strength of the castings, and seriously affect the performance and service life of the castings. On the other hand, uneven sand mixing will also cause the surface quality of the castings to decline. Uneven sand cannot form a smooth and flat surface during the molding process, resulting in rough, uneven and pitted surface of the castings. This not only affects the appearance quality of the castings, but also increases the workload and cost of subsequent processing, and reduces the production efficiency.

[0004] In order to solve this problem, the patent number CN118893174B discloses a casting mechanical sand mixing device for electric furnace manufacturing. In this patent application, a sand mixing barrel is provided with a cover plate at the top end, and a plurality of support columns are evenly welded on the upper surface of the cover plate near the center. The top ends of the support columns are fixed with the same supporting plate through bolts, and the top end of the supporting plate is fixed with a driving source near the center. The output shaft of the driving source penetrates through the supporting plate, and the output shaft of the driving source is connected with a rotating shaft through a shaft coupling. The present application sets a sand filter net to force the agglomerated sand mixing material to pass through the sand filter net, which helps to improve the efficiency of sand mixing, ensures uniform sand mixing, effectively reduces the defects such as air holes and sand holes in the casting, and high-efficiency and uniform sand mixing can help the casting surface to be smoother, thereby reducing the need for subsequent processing.

[0005] Although CN118893174B solves the problem of material agglomeration affecting uniformity in the sand mixing process to some extent, it mainly focuses on separating the sand particles according to their size, and lacks effective measures to deal with the internal reason for the adhesion and agglomeration of sand due to moisture. That is, the screened sand will still have the problem of agglomeration in subsequent use due to its own characteristics, which will cause air holes, porosity and other defects in the internal casting, reduce the strength and density of the casting, and seriously affect the quality and performance of the electric furnace. SUMMARY

[0006] The purpose of the present application is to provide a casting mechanical sand mixing device for electric furnace manufacturing, which realizes high-efficiency and uniform sand mixing process through the synergistic effect of the hopper conveyor, the premixer and the sand mixer, avoids the problems of water-containing sand agglomeration and uneven sand mixing, and significantly improves the casting quality and production efficiency.

[0007] To achieve the above purpose, the present application provides the following technical scheme: a casting mechanical sand mixing device for electric furnace manufacturing, comprising a hopper conveyor, a premixer and a sand mixer arranged in sequence along the sand treatment process, wherein: the hopper conveyor is used for directional conveying of sand, and comprises a rack, a conveying belt mounted on the inner side of the rack, and a plurality of feeding hoppers mounted on the upper side of the rack, the discharge directions of the plurality of feeding hoppers being distributed in a staggered manner; the premixer comprises an outer frame, a premixing conveying module and a spraying module, the outer frame is connected with the rack of the hopper conveyor, and the upper side and the middle of the outer frame are respectively provided with the premixing conveying module and the spraying module; the sand mixer comprises a sand mixer barrel, a lifting barrel, a receiving hopper, a gas injector and a third driving device, the lifting barrel is vertically arranged and provided with the receiving hopper at the bottom side, the receiving hopper is connected with the output side of the premixing conveying module, the lifting barrel is provided with an auger, the upper side of the lifting barrel is provided with the third driving device connected with the shaft end of the auger and driving the auger to operate, the outer wall of the lifting barrel is provided with an impact wall, and the upper side of the lifting barrel is provided with a discharge port.

[0008] Preferably, the premixing conveying module is connected to the output side of the conveying belt, and the premixing conveying module comprises a driving sprocket, a driven sprocket, a chain belt, a connecting piece and a premixing tray.

[0009] Preferably, the connecting piece is arranged on the outer side of the chain belt along the running direction of the chain belt, and the connecting piece is connected to the premixing tray.

[0010] Preferably, the spraying module comprises a liquid tank, a frame, a second driving device and a spraying frame, wherein the liquid tank and the frame are respectively fixed to the upper side and the lower side of the outer frame, the liquid tank stores the anti-sticking agent, the two spraying frames are hingedly connected to the two sides of the frame, the spraying frame is communicated with the liquid tank through a hose, and the two spraying frames are in a closing or expanding state under the action of the second driving device, and the anti-sticking agent is uniformly sprayed into the sand in the premixing tray to improve the cohesiveness of the sand.

[0011] Preferably, the second driving device comprises a motor, a rotating disc, a rotating rod, a first swing rod, a V-shaped rod and a second swing rod, the motor is fixed to the frame, the motor shaft is connected to the rotating disc, and the eccentric side of the end surface of the rotating disc is hingedly connected to the rotating rod.

[0012] Preferably, the first swing rod and the V-shaped rod are coaxially hingedly connected to the free end of the rotating rod, the middle part of the V-shaped rod is movably connected to the middle of the opening of the frame, the upper end of the V-shaped rod is hingedly connected to the second swing rod, and the ends of the first swing rod and the second swing rod are respectively hingedly connected to the two spraying frames on the two sides of the frame.

[0013] Preferably, the sand mixer cylinder cover is arranged outside the lifting cylinder, the sand mixer cylinder is integrally connected by a cylindrical cylinder and a conical cylinder, the top side of the cylindrical cylinder is provided with an access hole, and the cylindrical cylinder and the conical cylinder are communicated and the joint part is provided with a mesh frame.

[0014] Preferably, the inner side wall of the cylindrical cylinder is provided with a gas injector, and the lower side of the conical cylinder is provided with a discharging channel.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] The present application realizes high-efficiency and uniform sand mixing process through the cooperation of each part, avoids the problems such as water-containing sand agglomeration and uneven sand mixing, and significantly improves the casting quality and production efficiency. The specific technical effects include the following:

[0017] 1. The hopper-type conveyor realizes directional conveying of the sand through the rack, the conveying belt and the plurality of feed hoppers which are staggered in the discharge direction. The staggered design of the feed hoppers can uniformly distribute the sand on the conveying belt, avoid the accumulation and blockage of the material during conveying, and ensure that the sand can be stably and continuously conveyed to the subsequent processing link.

[0018] 2. The premixing tray in the premixer is a rectangular tray with an open top and a micro-vibrator at the bottom, which moves circularly with the chain drive and receives and vibrates the sand output by the conveying belt. During the vibration process, the relative movement between the sand particles can preliminarily break the small agglomerates that may be formed due to moisture or their own characteristics, making the sand more loose and laying a foundation for subsequent uniform mixing. At the same time, the vibration premixing can also make the sand more uniformly distributed in the premixing tray.

[0019] 3. The spray module controls the spray frame to be in a close-together or expanded state through the second driving device, which can uniformly spray the anti-sticking agent to the sand in the premixing tray. The anti-sticking agent can effectively reduce the bonding force between the sand particles and improve the cohesiveness of the sand, preventing the sand from agglomerating during the sand mixing process.

[0020] 4. The lifting cylinder in the sand mixer is provided with an auger, which can vertically lift the premixed sand. The gas injector is arranged to inject high-speed airflow into the cylinder, and the airflow collides and rubs with the sand particles to form a complex airflow field, which can make the sand roll strongly in the cylinder. During the sand falling process after being lifted, the sand will also collide with the impact wall of the outer wall of the lifting cylinder due to the influence of the airflow. This collision can further break up the small agglomerates that may exist, making the sand particles smaller and more uniform.

[0021] 5. The cylindrical cylinder and the conical cylinder are connected and the connection part is provided with a mesh frame. During the sand mixing process, the mesh frame can screen the sand and intercept the particles that are too large or not fully mixed, ensuring that the output sand fully meets the requirements of the casting process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present application;

[0023] Figure 2 is a schematic diagram of the structure of the hopper-type conveyor in the embodiment of the present application;

[0024] Figure 3 Figure 1 is a structural schematic diagram of a premixing machine in an embodiment of the present application;

[0025] Figure 4 Figure 2 is a structural schematic diagram of a premixing conveying module in an embodiment of the present application;

[0026] Figure 5 Figure 3 is a structural schematic diagram of a spraying module in an embodiment of the present application;

[0027] Figure 6 Figure 4 is a structural schematic diagram of a sand mixer in an embodiment of the present application;

[0028] Figure 7 Figure 5 is an internal structural schematic diagram of the sand mixer in an embodiment of the present application.

[0029] In the drawings:

[0030] 1, hopper conveyor; 101, rack; 102, conveying belt; 103, feeding hopper;

[0031] 2, premixing machine; 201, outer rack; 202, driving sprocket; 203, driven sprocket; 204, chain belt; 205, premixing tray; 206, liquid tank; 207, frame; 208, spraying frame; 209, motor; 210, rotating disc; 211, rotating rod; 212, first swing rod; 213, V-shaped rod; 214, second swing rod;

[0032] 3, sand mixer; 301, sand mixer cylinder; 302, lifting cylinder; 303, receiving hopper; 304, third driving device; 305, mesh frame; 306, discharging passage; 307, auger. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “vertical”, “upper”, “lower”, “horizontal” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Please refer to Figure 1 The present application provides a technical solution: a casting mechanical sand mixing device for electric furnace manufacturing, comprising a hopper conveyor 1, a premixer 2 and a sand mixer 3 arranged in sequence along the sand treatment process.

[0037] Please refer to Figure 2 In this embodiment, the hopper conveyor 1 is used for directional conveying of sand, and the hopper conveyor 1 comprises a rack 101, a conveying belt 102 mounted on the inner side of the rack 101, and a plurality of feeding hoppers 103 mounted on the upper side of the rack 101, the discharge directions of the plurality of feeding hoppers 103 being distributed in staggered positions.

[0038] Please refer to Figures 3-5In the embodiment, the premixing machine 2 comprises an outer frame 201, a premixing conveying module and a spraying module. The outer frame 201 is connected with the rack 101 of the hopper conveyor 1. The upper side and the middle of the outer frame 201 are respectively provided with the premixing conveying module and the spraying module. The premixing conveying module is connected with the output side of the conveying belt 102. The premixing conveying module comprises a driving sprocket 202, a driven sprocket 203, a chain belt 204, a connecting piece and a premixing tray 205. The driving sprocket 202 is connected with a first driving device at the shaft end. The driving sprocket 202 and the driven sprocket 203 are connected through the chain belt 204. The connecting piece is arranged at the outer side of the chain belt 204 along the running direction of the chain belt 204. The connecting piece is connected with the premixing tray 205. The premixing tray 205 is a rectangular tray with an open top and a micro vibrator arranged at the bottom. The premixing tray 205 is driven to move circularly by the chain belt 204 and receives and vibrates the sand output by the conveying belt 102. The spraying module comprises a liquid tank 206, a frame 207, a second driving device and a spraying frame 208. The liquid tank 206 and the frame 207 are respectively fixed to the upper side and the lower side of the outer frame 201. The liquid tank 206 stores the anti-sticking agent. The spraying frames 208 are hingedly connected to the two sides of the frame 207. The spraying frames 208 are communicated with the liquid tank 206 through a hose. The two spraying frames 208 are in a close or spread state by the second driving device and uniformly spray the anti-sticking agent to the sand in the premixing tray 205 to improve the cohesiveness of the sand. The second driving device comprises a motor 209, a rotating disc 210, a rotating rod 211, a first swing rod 212, a V-shaped rod 213 and a second swing rod 214. The motor 209 is fixed to the frame 207. The motor 209 is connected with the rotating disc 210 at the shaft end. The eccentric side of the end surface of the rotating disc 210 is hingedly connected with the rotating rod 211. The first swing rod 212 and the V-shaped rod 213 are coaxially hingedly connected with the free end of the rotating rod 211. The middle part of the V-shaped rod 213 is movably connected with the middle of the opening of the frame 207. The upper end of the V-shaped rod 213 is hingedly connected with the second swing rod 214. The ends of the first swing rod 212 and the second swing rod 214 are respectively hingedly connected with the two spraying frames 208 on the two sides of the frame 207.

[0039] Please refer to Figures 6-7In the embodiment, the sand mixer 3 comprises a sand mixer barrel 301, a lifting barrel 302, a receiving hopper 303, a gas injector and a third driving device 304. The lifting barrel 302 is vertically arranged and is provided with the receiving hopper 303 at the bottom side thereof, which is connected to the output side of the premixing conveying module. The lifting barrel 302 is provided with an auger 307, and the upper side of the lifting barrel 302 is provided with the third driving device 304, which is connected to the shaft end of the auger 307 and drives the auger 307 to rotate. The outer wall of the lifting barrel 302 is provided with an impact wall, and the upper side of the lifting barrel 302 is provided with a discharge port. The sand mixer barrel 301 is arranged outside the lifting barrel 302 and is integrally connected by a cylindrical barrel and a conical barrel. The top side of the cylindrical barrel is provided with an inspection port, and the cylindrical barrel and the conical barrel are connected and are provided with a screen frame 305 at the joint. The inner side wall of the cylindrical barrel is provided with a gas injector, and the lower side of the conical barrel is provided with a discharge channel 306.

[0040] The sand mixing device for foundry machinery manufacturing provided by the above embodiment realizes efficient and uniform mixing of the molding sand through the cooperation of the hopper conveyor 1, the premixer 2 and the sand mixer 3. The following is the operation principle of the sand mixing device:

[0041] 1) Start the hopper conveyor 1: turn on the driving device of the hopper conveyor 1 to start the operation of the conveying belt 102. Pour the molding sand into the plurality of feeding hoppers 103, respectively. Since the discharge directions of the plurality of feeding hoppers 103 are distributed in a staggered manner, the molding sand will be uniformly dropped on the conveying belt 102. With the movement of the conveying belt 102, the molding sand is directionally conveyed to the premixing conveying module of the premixer 2.

[0042] 2) Premixing conveying: the driving sprocket 202 of the premixing conveying module starts to rotate under the drive of the first driving device, and the driven sprocket 203 is driven to rotate through the chain belt 204. At the same time, the connecting piece outside the chain belt 204 drives the premixing tray 205 to move in a cycle. When the premixing tray 205 moves to the position connected to the output side of the conveying belt 102, the molding sand on the conveying belt 102 falls into the premixing tray 205.

[0043] 3) Vibration premixing: the micro vibrator at the bottom of the premixing tray 205 starts to work to generate vibration. Under the action of the vibration, the relative movement occurs between the molding sand particles in the premixing tray 205, which preliminarily breaks the small bonding groups possibly formed due to moisture or self characteristics, so that the molding sand is more loose and uniformly distributed.

[0044] 4) Spray anti-sticking agent: while the pre-mixed sand is being vibrated in the pre-mixing tray 205, the second driving device of the spray module starts to work. The motor 209 drives the rotation of the rotating disc 210, and the eccentric side of the rotating disc 210 end face is hinged to the rotating rod 211, which swings. The first swing rod 212 and the V-shaped rod are coaxially hinged to the free end of the rotating rod 211, the middle part of the V-shaped rod is movably connected to the opening of the frame 207, the upper end of the V-shaped connecting rod is hinged to the second swing rod 214, and the ends of the first swing rod 212 and the second swing rod 214 are hinged to the two spray racks 208 on both sides of the frame 207. Under the swinging action of the rotating rod 211, the first swing rod 212, the V-shaped rod and the second swing rod 214 move cooperatively to drive the two spray racks 208 to be close or spread. The anti-sticking agent in the liquid tank 206 is delivered to the spray rack 208 through the hose and uniformly sprayed onto the sand in the pre-mixing tray 205 to improve the cohesiveness of the sand and prevent the sand from clumping in the subsequent sand mixing process.

[0045] 5) Sand lifting: the pre-mixed sand falls into the receiving hopper 303 of the sand mixer 3 from the output side of the pre-mixing conveying module, and then enters the lifting cylinder 302. The auger 307 in the lifting cylinder 302 starts to rotate under the drive of the third driving device 304 to vertically lift the sand upward.

[0046] 6) Gas injection mixing: when the sand is lifted to the discharge port on the upper side of the lifting cylinder 302, it enters the sand mixer cylinder 301. The sand mixer cylinder 301 is covered outside the lifting cylinder 302 and is integrally connected by a cylindrical cylinder and a conical cylinder. The gas injector on the inner side wall of the cylindrical cylinder starts to work to inject high-speed airflow into the cylinder. The airflow collides and rubs with the sand particles, forming a complex airflow field, which causes the sand to produce strong tumbling and turbulent motion in the cylinder, enhancing the mixing effect between the sand.

[0047] 7) Impact dispersion: after the sand is output from the discharge port on the upper side of the lifting cylinder 302, the sand collides with the impact wall provided on the outer wall of the lifting cylinder 302 due to the influence of the airflow. This collision can further break up the possible small clumps, making the sand particles smaller and more uniform. At the same time, the rotation of the auger 307 can also produce a certain stirring effect in the lifting cylinder 302, promoting the preliminary mixing of the sand.

[0048] 8) Screening and output: during the sand mixing process, the sand is screened by the screen frame 305, and the uniformly mixed sand after screening is output from the discharge passage 306 on the lower side of the conical cylinder to enter the next casting process.

[0049] It is worth noting that the entire device is controlled by a total control system. Since the control system matches common devices, which belong to existing mature technology, the electrical connection relationship and specific circuit structure are not described here.

[0050] The embodiments of the present application are given for illustration and description only, although embodiments of the present application have been shown and described herein, it should be understood by the person skilled in the art that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application, and any changes, modifications, replacements and variations of the above-mentioned embodiments within the scope of the present application should be included in the protection scope of the present application.

Claims

1. A casting mechanical sand mixing device for electric furnace manufacturing, comprising a hopper conveyor (1), a pre-mixer (2), and a sand mixer (3) arranged progressively along the molding sand processing process, characterized in that: The hopper conveyor (1) is used for directional conveying of molding sand. The hopper conveyor (1) comprises a platform (101), a conveyor belt (102) installed inside the platform (101), and a plurality of feed hoppers (103) installed on the upper side of the platform (101). The discharge directions of the plurality of feed hoppers (103) are staggered. The premixer (2) includes an outer frame (201), a premixing conveying module and a spraying module. The outer frame (201) is connected to the stand (101) of the hopper conveyor (1). The premixing conveying module and the spraying module are respectively arranged on the upper side and the middle of the outer frame (201). The sand mixer (3) comprises a sand mixer barrel (301), a lifting barrel (302), a material receiving hopper (303), a gas injector and a third driving device (304). The lifting barrel (302) is vertically arranged and has a material receiving hopper (303) on its bottom side for receiving the output side of the premixing conveying module. An auger (307) is arranged in the lifting barrel (302). The third driving device (304) connected to the shaft end of the auger (307) and driving the auger (307) to operate is arranged on the upper side of the lifting barrel (302). An impact wall is arranged on the outer wall of the lifting barrel (302), and a material discharge port is arranged on the upper side of the lifting barrel (302).

2. A casting mechanical sand mixing device for electric furnace manufacturing according to claim 1, characterized in that: The premix conveying module is connected to the output side of the conveyor belt (102), and comprises a driving sprocket (202), a driven sprocket (203), a chain belt (204), a connecting piece and a premix tray (205). The shaft end of the driving sprocket (202) is connected to the first driving device, and the driving sprocket (202) and the driven sprocket (203) are linked by the chain belt (204).

3. A casting mechanical sand mixing device for electric furnace manufacturing according to claim 2, characterized in that: The chain belt (204) is provided with a connecting piece on the outer side along its running direction, and the connecting piece is connected to the premixing tray (205). The premixing tray (205) is a rectangular tray with an open top and a micro vibrator at the bottom. The premixing tray (205) moves cyclically with the chain belt (204) and receives and vibrates the molding sand output by the conveyor belt (102) to premix.

4. The sand mixing device for a casting machine used in electric furnace manufacturing according to claim 1, characterized in that: The spray module comprises a liquid tank (206), a frame (207), a second drive device and a spray rack (208), wherein the liquid tank (206) and the frame (207) are fixedly mounted on the upper and lower sides of the outer frame (201), respectively; the liquid tank (206) stores anti-sticking agent; both sides of the frame (207) are hingedly connected to the spray rack (208); the spray rack (208) is connected to the liquid tank (206) through a hose; the two spray racks (208) are brought into a close or extended state as the second drive device moves, and the anti-sticking agent is evenly sprayed onto the molding sand in the premix tray (205) to improve its adhesion.

5. A casting mechanical sand mixing device for electric furnace manufacturing according to claim 4, characterized in that: The second driving device comprises a motor (209), a rotating disk (210), a rotating rod (211), a first rocking rod (212), a V-shaped rod (213) and a second rocking rod (214); the motor (209) is fixed on the frame (207); the shaft end of the motor (209) is connected to the rotating disk (210); and the eccentric side of the end surface of the rotating disk (210) is hinged to the rotating rod (211).

6. A casting mechanical sand mixing device for electric furnace manufacturing according to claim 5, characterized in that: The first swing arm (212) and the V-shaped arm (213) are coaxially hinged to the free end of the rotating rod (211); the middle part of the V-shaped arm (213) is movably connected to the middle of the opening of the frame (207); the upper end of the V-shaped arm (213) is hinged to the second swing arm (214); and the ends of the first swing arm (212) and the second swing arm (214) are respectively hinged to the two spray racks (208) on both sides of the frame (207).

7. The sand mixing device for a casting machine used in electric furnace manufacturing according to claim 1, characterized in that: The sand mixing barrel (301) is covered outside the lifting barrel (302). The sand mixing barrel (301) is formed by integrally connecting a cylindrical barrel and a conical barrel at the upper and lower parts. An inspection port is provided on the top side of the cylindrical barrel. The cylindrical barrel and the conical barrel are connected and a leakage grid (305) is provided at the connection point.

8. A casting mechanical sand mixing device for electric furnace manufacturing according to claim 7, characterized in that: A gas injector is provided on the inner side wall of the cylindrical barrel, and a discharge channel (306) is provided on the lower side of the conical barrel.

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