Sand mixing device for green sand preparation

Abstract

The utility model discloses a sand mixing device for preparing green sand. The sand mixing device comprises a sand mixing tank, a blanking device, a first mixing device and a second mixing device, raw materials thrown out of the discharging port collide with the collision rod, and part of the raw materials fall onto the baffle with the holes and enter the sand mixing tank from the baffle with the holes in cooperation with rotation of the stirring blades, so that the dispersion degree of the raw materials is increased, the materials are prevented from being stacked at the same position in the sand mixing tank, dense filling is avoided, and the pressure during feeding is relieved. The stirring shaft is matched with the mixing blades to stir the interior of the sand mixing tank, and the stirring direction is opposite to that of the scraping plates, so that the moving direction of the raw materials is variable, and the raw material mixing efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sand mixing, and in particular relates to a sand mixing device for preparing green sand. Background Art

[0002] Sand mixing devices are used to mix green sand raw materials. Green sand is a molding material widely used in the casting process. It is made by mixing raw sand, clay, additives, and water in a certain proportion. However, existing devices have certain drawbacks when used. For example, a sand mixing device described in publication number CN209348497U integrates a proportional material batching bin with a mixing box. The materials are directly batched in the proportional material batching bin and then directly fed into the mixing box. The agitator with three stirring groups can mix the molding sand raw materials in different ways to improve mixing uniformity.

[0003] The stirring direction of the above device is consistent during stirring, resulting in a slow mixing speed; and when adding materials, the raw materials accumulate below the feed port, and there is a situation of intensive filling, which leads to local material accumulation, increases the burden of raw material mixing, and causes low mixing efficiency. Utility Model Content

[0004] In response to the problems and shortcomings of the above-mentioned prior art, the present invention provides a sand mixing device for preparing green sand. The raw materials ejected from the discharge port collide with the impact rod, and some of the raw materials fall onto the perforated baffle. The rotating stirring blades allow the raw materials to enter the sand mixing tank from the perforated baffle, thereby increasing the dispersion of the raw materials, preventing the materials from accumulating in the same location inside the sand mixing tank, avoiding the occurrence of intensive filling, and reducing the pressure during feeding. Furthermore, the stirring shaft cooperates with the mixing blades to stir the interior of the sand mixing tank. The stirring direction is opposite to that of the scraper plate, making the raw materials move in a variable direction, thereby improving the efficiency of raw material mixing.

[0005] The utility model is realized through the following technical solutions:

[0006] A sand mixing device for preparing wet sand, comprising a sand mixing tank, a feeding device, a first mixing device and a second mixing device. A top cover is installed on the top of the sand mixing tank, a feeding channel is provided on the top cover, and a ring gear is provided on the outside of the feeding channel. The feeding device comprises a feeding tank installed on top of the top cover, a rotating shaft passing through the feeding channel, a feeding pipe rotatably connected to the bottom of the feeding channel and a feeding motor, and a spiral blade is fixedly provided on the outside of the rotating shaft to facilitate the flow of materials into the sand mixing tank. The rotating shaft is connected to the ring gear in a transmission manner to provide power to the ring gear. A discharge port is provided on one side of the feeding pipe, and the feeding pipe is fixedly connected to the rotating shaft so that the rotating shaft drives the feeding pipe to rotate. The first mixing device comprises a stirring shaft and a servo motor fixed to the top cover. The stirring shaft passes through the top cover to the sand mixing tank to achieve stirring of the material. The second mixing device includes a gear ring and a scraper plate fixed to the bottom of the gear ring. The gear ring is embedded in the top cover and meshes with the ring gear. The scraper plate abuts against the inner wall of the sand mixing tank. The rotation direction of the gear ring is opposite to that of the stirring shaft, thereby improving the mixing uniformity of the materials.

[0007] Furthermore, the top cover includes a first cover body and a second cover body positioned above the first cover body. The separate first and second cover bodies facilitate installation of the gear ring within the top cover body. The first cover body is annular, and the second cover body is pancake-shaped. Annular protrusions are provided above the first cover body and below the second cover body. The inner diameter of the annular protrusions is larger than that of the first cover body. Steel balls that mate with the gear ring are embedded in the annular protrusions. A partition plate is fixed at the center of the lower portion of the second cover body. The gear ring is sleeved onto the outer side of the partition plate to limit the position of the gear ring.

[0008] Furthermore, the second mixing device also includes a perforated baffle located below the discharge pipe, which is fixed to the partition plate through an impact rod. There are multiple impact rods and they are evenly distributed along the circumferential direction of the perforated baffle to increase the dispersion of the raw materials, avoid the accumulation of materials in the same position inside the sand mixing tank, avoid the generation of intensive filling, and reduce the pressure during feeding.

[0009] Furthermore, a stirring blade is fixedly connected to the rotating shaft near the perforated baffle to improve the dispersion of the added raw materials.

[0010] Furthermore, the sand mixing device also includes a controller, which is fixed to the outside of the sand mixing tank. The feeding motor and the servo motor are both data-connected to the controller to realize control of the feeding motor and the servo motor.

[0011] Furthermore, a humidity sensor is installed in the sand mixing tank, and the humidity sensor is data-connected to the controller to detect the humidity in the sand mixing tank.

[0012] Furthermore, a discharge door is installed below the sand mixing tank, and a handle is installed on the discharge door.

[0013] Furthermore, a support leg is installed at the bottom of the sand mixing tank to support and fix the sand mixing tank. A plurality of mixing blades are fixed on the stirring shaft to stir the materials.

[0014] Furthermore, a reduction gearbox is installed between the servo motor and the stirring shaft.

[0015] Furthermore, a discharge motor is installed on the discharge tank, the discharge motor is connected to the rotating shaft, and a feed port is provided on the top of the discharge tank.

[0016] Beneficial effects of the utility model:

[0017] 1. The steel balls reduce the friction force on the gear ring during rotation. The rotating shaft drives the ring gear to rotate, and the gear drives the gear ring to rotate, so that the scraper plate scrapes the inner wall of the sand mixing tank. The scraping drives the raw materials to rotate, thus preventing the raw materials from adhering to the inner wall of the sand mixing tank during the subsequent unloading.

[0018] 2. The raw materials thrown out from the discharge port collide with the impact rod, and part of the raw materials fall onto the perforated baffle. With the rotation of the stirring blades, the raw materials enter the sand mixing tank from the perforated baffle, which increases the dispersion of the raw materials, avoids the accumulation of materials in the same position inside the sand mixing tank, avoids the generation of intensive filling, and reduces the pressure during feeding. The stirring shaft cooperates with the mixing blades to stir the inside of the sand mixing tank. The stirring direction is opposite to that of the scraper plate, making the raw material movement direction changeable, thereby improving the efficiency of raw material mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram for illustrating an exemplary embodiment of a sand mixing device for preparing green sand in the present invention;

[0020] Figure 2 A schematic structural diagram for illustrating a cross-section of a sand mixing device for preparing green sand according to the present invention;

[0021] Figure 3 A schematic structural diagram for illustrating an exemplary embodiment of the top cover and the second mixing device in the present invention;

[0022] Figure 4 A cross-sectional view illustrating a schematic embodiment of the top cover and its connection structure in the present invention;

[0023] Figure 5 To illustrate Figure 4 A partial enlarged schematic diagram of point A in the middle.

[0024] List of parts and reference numerals:

[0025] 1. Sand mixing tank; 11. Discharge door; 111. Handle; 12. Support leg; 2. Top cover; 21. Discharge channel; 22. Ring gear; 23. First cover; 24. Second cover; 25. Annular protrusion; 26. Steel ball; 27. Partition plate; 3. Discharge device; 31. Discharge tank; 32. Rotating shaft; 33. Discharge pipe; 331. Discharge port; 34. Discharge motor; 35. Spiral blade; 4. First mixing device; 41. Stirring shaft; 42. Servo motor; 43. Mixing blade; 44. Reducer; 5. Second mixing device; 51. Ring gear; 52. Scraper plate; 53. Baffle with holes; 54. Impact rod; 55. Stirring blade; 6. Controller; 7. Humidity sensor. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that the directional terms such as left, right, up, down, front and back in the embodiments of the present invention are merely relative concepts or are based on the normal use state of the product, that is, the direction of movement of the product, and should not be considered as limiting.

[0028] In addition, it should be noted that the dynamic terms such as "relative motion" mentioned in the embodiments of the present invention not only refer to changes in position, but also include movements such as rotation and rolling in which there is no relative change in position but the state is changed.

[0029] Finally, it should be noted that when a component is referred to as being "located on" or "disposed on" another component, it can be on the other component or there may be an intervening component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0030] like Figures 1 to 5A sand mixing device for preparing green sand is shown, comprising a sand mixing tank 1, a feeding device 3, a first mixing device 4, and a second mixing device 5. A top cover 2 is mounted on the top of the sand mixing tank 1, which is provided with a feeding channel 21. A ring gear 22 is disposed on the outer side of the feeding channel 21. The feeding device 3 comprises a feeding tank 31 mounted above the top cover 2, a rotating shaft 32 extending through the feeding channel 21, a feeding pipe 33 rotatably connected to the bottom of the feeding channel 21, and a feeding motor 34. A spiral blade 35 is fixedly mounted on the outer side of the rotating shaft 32 to facilitate the flow of material into the sand mixing tank 1. The rotating shaft 32 is in transmission connection with the ring gear 22, providing power to the ring gear 22. A discharge port 331 is disposed on one side of the feeding pipe 33, which is fixedly connected to the rotating shaft 32 so that the rotating shaft 32 drives the feeding pipe 33 to rotate. The first mixing device 4 includes a stirring shaft 41 and a servo motor 42 fixed to the top cover 2. The stirring shaft 41 passes through the top cover 2 and reaches the sand mixing tank 1 to achieve material mixing. The second mixing device 5 includes a ring gear 51 and a scraper plate 52 fixed below the ring gear 51. The ring gear 51 is embedded in the top cover 2 and meshes with the ring gear 22. The scraper plate 52 abuts the inner wall of the sand mixing tank 1. The direction of rotation of the ring gear 51 is opposite to that of the stirring shaft 41, which improves the uniformity of material mixing.

[0031] In one embodiment, when in use, the configured molding sand raw materials are put into the discharge tank 31, and the discharge motor 34 is started. The discharge motor 34 drives the rotating shaft 32 to rotate to discharge the raw materials inside the discharge tank 31. While discharging, it drives the scraper plate 52 on the ring gear 51 to rotate, scraping the inner wall of the sand mixing tank 1 to prevent the raw materials from adhering to the inner wall of the sand mixing tank 1, and at the same time assisting in mixing the raw materials inside the sand mixing tank 1. The reduction box 44 cooperates with the servo motor 42 to drive the stirring shaft 41 to rotate, and the inside of the sand mixing tank 1 is stirred by the stirring shaft 41. In addition, the rotation direction of the discharge motor 34 is opposite to that of the servo motor 42, so that the stirring shaft 41 cooperates with the scraper plate 52 to fully stir the raw materials, so that the raw materials are mixed more evenly.

[0032] In one embodiment, if Figure 1-2As shown, a discharge door 11 is hingedly connected to the outer surface of the mixing tank 1 near the lower surface. A handle 111 is fixedly connected to the front surface of the discharge door 11. A humidity sensor 7 is embedded and connected to the interior of the mixing tank 1. Support legs 12 are fixedly connected to the lower surface of the mixing tank 1. A feed hole is defined on the upper surface of the discharge tank 31. A spiral blade 35 is fixedly connected to the outer surface of the rotating shaft 32. A discharge pipe 33 is embedded and rotatably connected to the lower end of the discharge tank 31. The outer surface of the discharge pipe 33 has a discharge port 331. In this embodiment, the controller 6 is electrically connected to the humidity sensor 7. The humidity sensor 7 is specifically an EE160 series temperature and humidity sensor 7, which can sense the temperature and humidity in the mixing tank 1. The rotating shaft 32 drives the spiral blade 35 to rotate, causing the material to enter the discharge pipe 33 in a spiral direction. The material in the discharge pipe 33 is ejected under the action of centrifugal force.

[0033] Preferably, the top cover 2 includes a first cover body 23 and a second cover body 24 located above the first cover body 23. The first cover body 23 and the second cover body 24 are separately arranged to facilitate the installation of the ring gear 51 into the top cover 2. The first cover body 23 is annular, and the second cover body 24 is pancake-shaped. An annular protrusion 25 is provided above the first cover body 23 and below the second cover body 24. The inner diameter of the annular protrusion 25 is larger than the inner diameter of the first cover body 23. The annular protrusion 25 is embedded with a steel ball 26 that cooperates with the ring gear 51. A partition plate 27 is fixed at the center position below the second cover body 24. The ring gear 51 is sleeved onto the outer side of the partition plate 27 to limit the position of the ring gear 51.

[0034] In one embodiment, the steel balls 26 reduce the friction force on the ring gear 51 during rotation. The rotating shaft 32 drives the ring gear 22 to rotate, and the ring gear 22 drives the ring gear 51 to rotate, so that the scraping plate 52 scrapes the inner wall of the sand mixing tank 1. The scraping drives the raw materials to rotate, thereby preventing the raw materials from adhering to the inner wall of the sand mixing tank 1 during subsequent unloading.

[0035] Preferably, the second mixing device 5 also includes a perforated baffle 53 located below the discharge pipe 33. The perforated baffle 53 is fixed to the partition plate 27 through an impact rod 54. There are multiple impact rods 54 and they are evenly distributed along the circumferential direction of the perforated baffle 53 to increase the dispersion of the raw materials, avoid the accumulation of materials at the same position inside the sand mixing tank 1, avoid the generation of intensive filling, and reduce the pressure during feeding.

[0036] Preferably, a stirring blade 55 is fixedly connected to the rotating shaft 32 near the perforated baffle 53 to improve the dispersion of the added raw materials.

[0037] In one embodiment, when the raw materials are driven to rotate, the raw materials thrown out from the discharge port 331 collide with the impact rod 54, and part of the raw materials fall onto the perforated baffle 53. Cooperating with the rotation of the stirring blade 55, the raw materials enter the interior of the sand mixing tank 1 from the perforated baffle 53, thereby increasing the dispersion of the raw materials, avoiding the accumulation of materials at the same position inside the sand mixing tank 1, avoiding the generation of intensive filling, and reducing the pressure during feeding. The stirring shaft 41 cooperates with the mixing blade 43 to stir the interior of the sand mixing tank 1, and the stirring direction is opposite to the stirring direction of the scraper 52, so that the moving direction of the raw materials is changeable, thereby improving the efficiency of raw material mixing.

[0038] Preferably, the sand mixing device further comprises a controller 6 , which is fixed to the outside of the sand mixing tank 1 , and the feed motor 34 and the servo motor 42 are both data-connected to the controller 6 to control the feed motor 34 and the servo motor 42 .

[0039] Preferably, a humidity sensor 7 is further installed in the sand mixing tank 1 , and the humidity sensor 7 is data-connected to the controller 6 to detect the humidity in the sand mixing tank 1 .

[0040] Preferably, a discharge door 11 is further installed below the sand mixing tank 1 , and a handle 111 is installed on the discharge door 11 .

[0041] Preferably, a support leg 12 is installed at the bottom of the sand mixing tank 1 to support and fix the sand mixing tank 1. A plurality of mixing blades 43 are fixed on the stirring shaft 41 for stirring the material.

[0042] Preferably, a reduction gearbox 44 is installed between the servo motor 42 and the stirring shaft 41 .

[0043] Preferably, the discharge motor 34 is installed to the discharge tank 31 , the discharge motor 34 is in transmission connection with the rotating shaft 32 , and a feed port is provided at the top of the discharge tank 31 .

[0044] When using the aforementioned green sand mixing device, raw materials ejected from the discharge port 331 collide with the impact rod 54, causing some of the raw materials to fall onto the perforated baffle 53. The rotating stirring blades 55 then allow the raw materials to enter the mixing tank 1 from the perforated baffle 53, thereby increasing the dispersion of the raw materials and preventing them from accumulating in the same location within the mixing tank 1. This prevents intensive filling and reduces pressure during feeding. Furthermore, the stirring shaft 41, in conjunction with the mixing blades 43, stirs the interior of the mixing tank 1 in a direction opposite to that of the scraper 52, allowing the raw materials to move in a variety of directions, thereby improving the efficiency of raw material mixing.

[0045] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A sand mixing device for preparing green sand, characterized in that: include: A sand mixing tank, wherein a top cover is installed on the top of the sand mixing tank, a material discharge channel is opened on the top cover, and a ring gear is provided on the outside of the material discharge channel; A discharge device, comprising a discharge tank mounted above the top cover, a rotating shaft passing through the discharge channel, a discharge pipe rotatably connected to the bottom of the discharge channel, and a discharge motor, wherein a spiral blade is fixedly provided on the outer side of the rotating shaft, the rotating shaft is transmission-connected to the ring gear, a discharge port is opened on one side of the discharge pipe, and the discharge pipe is fixedly connected to the rotating shaft; a first mixing device, comprising a stirring shaft and a servo motor fixed to the top cover, wherein the stirring shaft passes through the top cover to the sand mixing tank; The second mixing device includes a ring gear and a scraper plate fixed to the bottom of the ring gear, the ring gear is embedded in the top cover and meshes with the ring gear, the scraper plate abuts against the inner wall of the sand mixing tank, and the rotation direction of the ring gear is opposite to the rotation direction of the stirring shaft.

2. A sand mixing device for preparing green sand according to claim 1, characterized in that: The top cover includes a first cover body and a second cover body located above the first cover body, the first cover body is ring-shaped, and the second cover body is pancake-shaped. An annular protrusion is provided above the first cover body and below the second cover body. The inner diameter of the annular protrusion is larger than the inner diameter of the first cover body. The annular protrusion is embedded with a steel ball that cooperates with the gear ring. A partition plate is fixed at the center position below the second cover body, and the gear ring is sleeved to the outer side of the partition plate.

3. A sand mixing device for preparing green sand according to claim 2, characterized in that: The second mixing device further comprises a perforated baffle located below the feed pipe, wherein the perforated baffle is fixed to the partition plate via impact rods, and a plurality of impact rods are provided and are evenly distributed along the circumferential direction of the perforated baffle.

4. A sand mixing device for preparing green sand according to claim 3, characterized in that: A stirring blade is fixedly connected to the rotating shaft near the baffle with holes.

5. A sand mixing device for preparing green sand according to claim 1, characterized in that: The device further comprises a controller, which is fixed to the outside of the sand mixing tank. The feeding motor and the servo motor are both data-connected to the controller.

6. A sand mixing device for preparing green sand according to claim 5, characterized in that: A humidity sensor is also installed in the sand mixing tank, and the humidity sensor is data-connected to the controller.

7. A sand mixing device for preparing green sand according to claim 1, characterized in that: A discharge door is also installed below the sand mixing tank, and a handle is installed on the discharge door.

8. A sand mixing device for preparing green sand according to claim 1, characterized in that: The bottom of the sand mixing tank is equipped with supporting legs, and a plurality of mixing blades are fixed on the stirring shaft.

9. A sand mixing device for preparing green sand according to claim 1, characterized in that: A reduction gearbox is installed between the servo motor and the stirring shaft.

10. A sand mixing device for preparing green sand according to claim 1, characterized in that: The discharge motor is installed on the discharge tank, the discharge motor is in transmission connection with the rotating shaft, and a feed port is provided on the top of the discharge tank.

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