Sand mixing equipment for hardware casting machining
By introducing a combination of fixed and rotary mixing mechanisms into the sand mixing equipment, along with scraper and spiral discharge mechanisms, the problem of uneven mixing in traditional equipment is solved, achieving efficient mixing and rapid discharge, thus improving casting quality and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DAFENG WANCHENG MASCH CO LTD
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional sand mixing equipment has a limited mixing trajectory during the mixing process, resulting in uneven mixing of sand materials, which affects the performance of molding sand and the quality of castings. In addition, the mixing time is long and the energy consumption is high.
It adopts a combination of fixed and rotary mixing mechanisms, and achieves revolution and rotation through a single drive source to form a composite mixing flow field. Combined with the design of scraper and fixed paddle, it eliminates mixing dead corners and is equipped with a spiral discharge mechanism to achieve rapid discharge.
It achieves efficient and uniform mixing of sand, eliminates dead zones in the mixing process, improves production efficiency and equipment stability, ensures casting quality, and enables rapid and thorough discharge of mixed sand.
Smart Images
Figure CN122007333A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of casting equipment technology, specifically to a sand mixing device for casting and processing hardware parts. Background Technology
[0002] In the hardware casting production process, the mixing quality of molding sand directly affects the dimensional accuracy, surface quality, and yield of the castings. The sand mixing process aims to fully and uniformly mix sand materials of different particle sizes, binders, and other additives to form molding sand with good formability and strength.
[0003] However, traditional sand mixing equipment has inherent flaws in its mixing mechanism. Most equipment uses a single agitator or shaft for rotary mixing, with the mixing trajectory limited to a single circular motion or simple reciprocating motion centered on the shaft. This single mixing mode limits the flow path of the sand within the mixing tank, easily leading to eddies or dead zones at the tank's edges, bottom, or mixing blind areas. This results in uneven mixing of the sand, stratification of different components, or uneven distribution of the binder. This not only prolongs the necessary mixing time, reduces production efficiency, and increases energy consumption, but more seriously, insufficient local mixing can lead to unstable molding sand properties, causing casting defects such as sand holes, porosity, and sand inclusions in the castings, thus affecting product quality.
[0004] Therefore, a sand mixing device for hardware casting is proposed. Summary of the Invention
[0005] The purpose of this invention is to provide a sand mixing device for metal casting to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: A sand mixing device for metal casting includes a sand mixing tank. A fixed stirring mechanism is rotatably installed at the bottom of the sand mixing tank, and a limit mechanism is provided at the top of the fixed stirring mechanism to limit its rotation. A rotary stirring mechanism is provided inside the fixed stirring mechanism. A driving mechanism is provided at the bottom surface of the sand mixing tank, the ends of the fixed stirring mechanism and the rotary stirring mechanism to drive the fixed stirring mechanism and the rotary stirring mechanism to rotate.
[0007] Furthermore, the bottom surface of the sand mixing tank is provided with a discharge port, and the bottom end of the discharge port and inside the discharge port is provided with a spiral discharge mechanism for discharging sand.
[0008] Furthermore, the fixed stirring mechanism includes a sleeve rod that is rotatably inserted into the bottom of the sand mixing tank. A connecting ring is fixedly sleeved on the surface of the sleeve rod, and a scraper is welded to the surface of the connecting ring. A cross frame is fixedly sleeved on the top of the sleeve rod, and a fixed paddle is fixedly installed on the bottom surface of the cross frame.
[0009] Furthermore, the limiting mechanism includes a rod fixedly installed at the top of the crossbeam and located at both ends thereon, a stepped wheel rotatably sleeved on the surface of the rod, and a snap ring engaging the surface of the rod.
[0010] Furthermore, the rotary stirring mechanism includes a second rotating shaft rotatably inserted into the sleeve and a third rotating shaft rotatably inserted into the crossbeam. The top ends of the second and third rotating shafts are fixedly fitted with synchronous pulleys, and synchronous belts are fitted on the two sets of synchronous pulleys. A cross is fixedly installed at the bottom end of the third rotating shaft, and a stirring paddle is fixedly installed on the bottom surface of the cross.
[0011] Furthermore, the drive mechanism includes a side plate fixedly installed on the bottom surface of the sand mixing tank. A second motor is fixedly installed on one side wall of the side plate. The bottom end of the sleeve rod and the second rotating shaft, as well as the output end of the second motor, are all fixedly connected to bevel gears, which are meshed together.
[0012] Furthermore, the discharge port includes a discharge trough located at the bottom of the sand mixing tank, a discharge pipe is provided on the bottom surface of the discharge trough, and a discharge nozzle is provided on the surface of the discharge pipe for discharging sand.
[0013] Furthermore, the spiral discharge mechanism includes a lower sealing plate that is bolted to the bottom of the discharge trough. A first motor is fixedly installed on the bottom surface of the lower sealing plate. A first rotating shaft is fixedly connected to the output end of the first motor. A spiral auger is fixedly sleeved on the surface of the first rotating shaft. The spiral auger is located inside the discharge trough and fits against the inner wall of the discharge trough.
[0014] Furthermore, the top edge of the sand mixing tank has an L-shaped structure, and the stepped wheel rolls in close contact with the top edge of the sand mixing tank.
[0015] Furthermore, the top surface of the cross frame is fixedly covered with a protective cover, and the timing pulley and timing belt are both located inside the protective cover.
[0016] The beneficial effects of this invention are as follows: A single drive source enables the fixed mixing mechanism to revolve and the rotary mixing mechanism to rotate, forming a highly efficient composite mixing flow field that completely eliminates dead zones and achieves high mixing uniformity. The combined design of scrapers and fixed paddles effectively prevents sand from sticking to the tank wall while achieving mixing, ensuring effective mixing volume. The limiting mechanism ensures the smooth operation of the revolving crossbeam, improving the overall stability and reliability of the equipment. The screw discharge mechanism enables rapid, thorough, and controllable discharge of the mixed sand, improving the continuity of operation. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a first partial schematic diagram of the present invention; Figure 5 This is a second partial schematic diagram of the present invention; Figure 6 This is a schematic diagram of the fixed stirring mechanism of the present invention; Figure 7 This is a schematic diagram of the cross-shaped structure and the stirring paddle of the present invention; Reference numerals: 1. Sand mixing tank; 2. Discharge port; 201. Discharge trough; 202. Discharge pipe; 203. Discharge nozzle; 3. Spiral discharge mechanism; 301. Lower sealing plate; 302. First motor; 303. First rotating shaft; 304. Spiral auger; 4. Fixed stirring mechanism; 401. Sleeve rod; 402. Connecting ring; 403. Scraper; 404. Cross frame; 405. Fixed paddle; 5. Limiting mechanism; 501. Rod body; 502. Stepped wheel; 503. Snap ring; 6. Rotary stirring mechanism; 601. Second rotating shaft; 602. Third rotating shaft; 603. Synchronous pulley; 604. Synchronous belt; 605. Cross; 606. Stirring paddle; 7. Drive mechanism; 701. Side plate; 702. Second motor; 703. Bevel gear; 8. Protective cover. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0019] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.
[0020] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0021] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention 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. Therefore, they should not be construed as limitations on the present invention.
[0022] like Figures 1 to 7 As shown, a sand mixing device for hardware casting includes a sand mixing tank 1, a fixed stirring mechanism 4 is rotatably installed at the bottom of the sand mixing tank 1, and a limit mechanism 5 is provided at the top of the fixed stirring mechanism 4 to limit the rotation of the fixed stirring mechanism 4. Specifically, the fixed stirring mechanism 4 includes a sleeve rod 401 rotatably inserted into the bottom of the sand mixing tank 1. A connecting ring 402 is fixedly sleeved on the surface of the sleeve rod 401, and a scraper 403 is welded to the surface of the connecting ring 402. A cross frame 404 is fixedly sleeved at the top of the sleeve rod 401, and a fixed paddle 405 is fixedly installed on the bottom surface of the cross frame 404. The limiting mechanism 5 includes a rod body 501 fixedly installed at the top of the cross frame 404 and located at both ends. A stepped wheel 502 is rotatably sleeved on the surface of the rod body 501, and a retaining spring 503 is snapped onto the surface of the rod body 501. The top edge of the sand mixing tank 1 has an L-shaped structure, and the stepped wheel 502 rolls in close contact with the top edge of the sand mixing tank 1.
[0023] More specifically, the sleeve rod 401 serves as the main drive shaft, driving the entire fixed mixing mechanism 4 to revolve around the central axis of the sand mixing tank 1. The fixed paddle 405 agitates the sand in the middle of the tank over a wide range, while the scraper 403 rotates close to the inner wall of the tank, continuously scraping away any sand that may adhere to it. At the same time, the stepped wheel 502 provides stable radial constraint and axial positioning for the high-speed rotating crossbeam 404 through its rolling support on the L-shaped edge of the sand mixing tank 1.
[0024] A rotary stirring mechanism 6 is installed inside the fixed stirring mechanism 4; Specifically, the rotary stirring mechanism 6 includes a second rotating shaft 601 rotatably inserted into the sleeve 401 and a third rotating shaft 602 rotatably inserted into the cross frame 404. The top ends of the second rotating shaft 601 and the third rotating shaft 602 are fixedly fitted with synchronous pulleys 603, and synchronous belts 604 are fitted on the two sets of synchronous pulleys 603. A cross 605 is fixedly installed at the bottom end of the third rotating shaft 602, and a stirring paddle 606 is fixedly installed on the bottom surface of the cross 605. A protective cover 8 is fixedly covered on the top surface of the cross frame 404, and the synchronous pulleys 603 and the synchronous belts 604 are both located inside the protective cover 8.
[0025] More specifically, the rotation of the second shaft 601 is precisely transmitted to the third shaft 602 via the synchronous pulley 603 and synchronous belt 604, driving the agitator 606 to rotate at high speed. Simultaneously, since the third shaft 602 is mounted on the revolving crossbeam 404, the agitator 606 rotates on its own axis while also revolving with the crossbeam 404, forming a complex planetary mixing trajectory. The centrifugal force generated by the revolution causes the sand to move outwards, while the shear force generated by the rotation causes the sand to tumble and diffuse inwards. These two movements are intensely coupled, creating a strong convection, shearing, and diffusion mixing flow field within the mixing tank 1. At the same time, the protective cover 8 seals and protects the synchronous transmission components, which are susceptible to sand contamination, ensuring the long-term reliable operation of the transmission system under harsh conditions. Combined with the actions of the single scraper 403 and fixed paddle 405, a synergistic effect is achieved, resulting in rapid mixing of the sand on a macroscopic scale and intense shearing and homogenization on a microscopic scale, realizing efficient mixing from the tank wall to the center and from the top to the bottom, without any dead angles.
[0026] A drive mechanism 7 is provided on the bottom surface of the sand mixing tank 1, the end of the fixed stirring mechanism 4 and the rotary stirring mechanism 6, for driving the fixed stirring mechanism 4 and the rotary stirring mechanism 6 to rotate. Specifically, the drive mechanism 7 includes a side plate 701 fixedly installed on the bottom surface of the sand mixing tank 1. A second motor 702 is fixedly installed on one side wall of the side plate 701. The bottom end of the sleeve rod 401 and the second rotating shaft 601, as well as the output end of the second motor 702, are all fixedly connected to bevel gears 703, which are meshed.
[0027] More specifically, a single second electric motor 702 and a set of meshing bevel gears 703 can simultaneously drive the sleeve rod 401 (which drives the fixed stirring mechanism 4 to revolve) and the second rotating shaft 601 (which drives the rotary stirring mechanism 6 to rotate).
[0028] In practical applications, the bottom surface of the sand mixing tank 1 is provided with a discharge port 2, and the bottom end of the discharge port 2 and inside the discharge port 2 are provided with a spiral discharge mechanism 3 for discharging sand; the discharge port 2 includes a discharge trough 201 provided at the bottom of the sand mixing tank 1, the bottom surface of the discharge trough 201 is provided with a discharge pipe 202, and the surface of the discharge pipe 202 is provided with a discharge nozzle 203 for discharging sand; the spiral discharge mechanism 3 includes a lower sealing plate 301 fixedly connected to the bottom end of the discharge trough 201 by bolts, the bottom surface of the lower sealing plate 301 is fixedly installed with a first motor 302, the output end of the first motor 302 is fixedly connected with a first rotating shaft 303, and the surface of the first rotating shaft 303 is fixedly sleeved with a spiral auger 304, the spiral auger 304 is located inside the discharge trough 201 and fits against the inner wall of the discharge trough 201.
[0029] More specifically, the mixed sand material is collected in the conical discharge trough 201 under the action of gravity. The first motor 302 drives the spiral auger 304 to rotate, generating an upward conveying force to force and continuously push the sand material out from the discharge nozzle 203. At the same time, the tight fit between the spiral auger 304 and the inner wall of the discharge trough 201 achieves sealing and forced discharge, effectively preventing sand material from remaining at the bottom and clogging the discharge port 2, ensuring the thoroughness and controllability of discharge, and providing a guarantee for continuous production.
[0030] A method for using a sand mixing device for metal casting includes the following steps: S1. Put the foundry sand to be mixed into the sand mixing tank 1; S2. Start the second motor 702 of the drive mechanism 7, which simultaneously drives the sleeve rod 401 and the second rotating shaft 601 to rotate at a set speed through the meshing bevel gears 703. S3, the rotating sleeve 401 drives the connecting ring 402, scraper 403, cross frame 404 and fixed paddle 405 of the fixed mixing mechanism 4 to revolve around the center of the sand mixing tank 1, macroscopically agitating the sand and scraping off the sand adhering to the tank wall; S4. The rotation of the second rotating shaft 601 drives the third rotating shaft 602 to rotate through the top synchronous wheel 603 and synchronous belt 604, thereby driving the cross 605 and the stirring paddle 606 on it to rotate at high speed while revolving with the cross frame 404, forming a planetary compound stirring. S5. After the mixing meets the process requirements, stop the second motor 702 and start the first motor 302 of the screw discharge mechanism 3 to drive the screw auger 304 to rotate, so that the uniformly mixed sand is continuously and controllably discharged from the discharge port 2.
[0031] In summary: During operation, the second motor 702 simultaneously drives the sleeve rod 401 and the second rotating shaft 601 to rotate via the bevel gear set 703. The sleeve rod 401 drives the entire fixed mixing mechanism 4 (including the scraper 403 and the fixed paddle 405) to revolve around the center of the sand mixing tank 1, performing macroscopic agitation and wall scraping. The rotation of the second rotating shaft 601 is transmitted through the upper synchronous belt 604, driving the third rotating shaft 602 and the mixing paddle 606 mounted on the cross frame 404 to rotate at high speed. Every point on the orbital path of the mixing paddle 606 rotates rapidly, forming a strong planetary mixing motion. Combined with the agitation of the fixed paddle 405 and the scraping of the scraper 403, this produces a complex and efficient convection, shearing, and diffusion mixing effect within the tank. After mixing is completed, the screw discharge mechanism 3 is activated to completely discharge the sand.
[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.
Claims
1. A sand mixing device for casting and processing hardware parts, characterized in that, The system includes a sand mixing tank (1), a fixed stirring mechanism (4) is rotatably installed at the bottom of the sand mixing tank (1), and a limit mechanism (5) is provided at the top of the fixed stirring mechanism (4) to limit the rotation of the fixed stirring mechanism (4). A rotary stirring mechanism (6) is provided inside the fixed stirring mechanism (4). A driving mechanism (7) is provided at the bottom surface of the sand mixing tank (1), the ends of the fixed stirring mechanism (4) and the rotary stirring mechanism (6) to drive the fixed stirring mechanism (4) and the rotary stirring mechanism (6) to rotate.
2. The sand mixing equipment for hardware casting and processing according to claim 1, characterized in that, The bottom surface of the sand mixing tank (1) is provided with a discharge port (2), and the bottom end of the discharge port (2) and inside the discharge port (2) is provided with a spiral discharge mechanism (3) for discharging sand.
3. The sand mixing equipment for hardware casting and processing according to claim 1, characterized in that, The fixed stirring mechanism (4) includes a sleeve (401) that is rotatably inserted into the bottom of the sand mixing tank (1). A connecting ring (402) is fixedly sleeved on the surface of the sleeve (401), and a scraper (403) is welded to the surface of the connecting ring (402). A cross frame (404) is fixedly sleeved on the top of the sleeve (401), and a fixed paddle (405) is fixedly installed on the bottom surface of the cross frame (404).
4. The sand mixing equipment for hardware casting and processing according to claim 3, characterized in that, The limiting mechanism (5) includes a rod (501) fixedly installed at the top of the crossbar (404) and located at both ends thereon. The surface of the rod (501) is rotatably fitted with a stepped wheel (502), and the surface of the rod (501) is snapped with a snap ring (503).
5. A sand mixing device for hardware casting and processing according to claim 3, characterized in that, The rotary stirring mechanism (6) includes a second rotating shaft (601) rotatably inserted into the sleeve (401) and a third rotating shaft (602) rotatably inserted into the cross frame (404). The top ends of the second rotating shaft (601) and the third rotating shaft (602) are fixedly fitted with synchronous pulleys (603), and synchronous belts (604) are fitted on the two sets of synchronous pulleys (603). The bottom end of the third rotating shaft (602) is fixedly installed with a cross (605), and the bottom surface of the cross (605) is fixedly installed with a stirring paddle (606).
6. The sand mixing equipment for hardware casting and processing according to claim 5, characterized in that, The drive mechanism (7) includes a side plate (701) fixedly installed on the bottom surface of the sand mixing tank (1). A second motor (702) is fixedly installed on one side wall of the side plate (701). The bottom end of the sleeve rod (401) and the second rotating shaft (601) and the output end of the second motor (702) are all fixedly connected to bevel gears (703), which are meshed.
7. A sand mixing device for hardware casting and processing according to claim 2, characterized in that, The discharge port (2) includes a discharge trough (201) at the bottom of the sand mixing tank (1). The bottom surface of the discharge trough (201) is provided with a discharge pipe (202), and the surface of the discharge pipe (202) is provided with a discharge nozzle (203) for discharging sand.
8. A sand mixing device for hardware casting and processing according to claim 7, characterized in that, The spiral discharge mechanism (3) includes a lower sealing plate (301) fixedly connected to the bottom of the discharge trough (201) by bolts. A first motor (302) is fixedly installed on the bottom surface of the lower sealing plate (301). A first rotating shaft (303) is fixedly connected to the output end of the first motor (302). A spiral auger (304) is fixedly sleeved on the surface of the first rotating shaft (303). The spiral auger (304) is located inside the discharge trough (201) and fits against the inner wall of the discharge trough (201).
9. A sand mixing device for hardware casting and processing according to claim 4, characterized in that, The top edge of the sand mixing tank (1) has an L-shaped structure, and the stepped wheel (502) rolls in close contact with the top edge of the sand mixing tank (1).
10. A sand mixing device for hardware casting and processing according to claim 5, characterized in that, The top surface of the cross frame (404) is fixedly covered with a protective cover (8), and the synchronous pulley (603) and synchronous belt (604) are both located inside the protective cover (8).