Sand mixing device for precoated sand production

Abstract

The utility model is applicable to the technical field of precoated sand processing, and provides a sand mixing device for precoated sand production, which comprises a sand mixing box, a stirring transmission component is mounted at the central position in the sand mixing box, a cleaning stirring component is connected onto the stirring transmission component, and the cleaning stirring component is arranged in the sand mixing box; the stirring motor controls the stirring rod to drive the spiral blade to rotate, sand grains and resin at the center in the sand mixing box are stirred and mixed, and meanwhile the sand grains and the resin at the upper portion are driven to be conveyed downwards, so that the sand grains at the upper layer can penetrate through the viscous resin at the upper layer to be stirred and mixed with the resin at the lower layer under the assistance of the spiral blade; the stirring effect and the stirring efficiency are improved; and in the rotary stirring process of the stirring rod, the connecting plate drives the fixing plate and the scraping plate to rotate, the inner wall of the sand mixing box is cleaned, and part of sand grains are prevented from adhering to the inner wall of the sand mixing box under the action of gum.

Description

Technical Field

[0001] The utility model belongs to the technical field of coated sand processing, in particular to a sand mixing device for producing coated sand. Background Art

[0002] Coated sand is a type of molding sand or core sand that is covered with a layer of solid resin film on the surface of the sand before molding. There are two coating processes: cold method and hot method. In the cold method, the resin is dissolved in ethanol, and hexamethylenetetramine is added during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol evaporates to obtain coated sand; in the hot method, the sand is preheated to a certain temperature, the resin is added to melt it, and the resin is stirred to coat the surface of the sand, and an aqueous solution of hexamethylenetetramine and a lubricant are added. The coated sand is cooled, crushed, and sieved to obtain coated sand, which is used for steel castings and iron castings.

[0003] The Chinese utility model patent with publication number CN216263325U discloses an efficient and stable coated sand mixing device, including a mixing box, a support frame is fixedly installed on the circumferential side wall of the mixing box, and a driving motor is fixedly installed at the bottom of the mixing box, the driving motor passes through the mixing box and is fixedly connected to a stirring mechanism, and a cover plate is installed at the top of the mixing box, two symmetrically distributed material boxes are fixedly installed on the top of the cover plate, and a connecting pipe is fixedly installed at the bottom of the material box. The utility model preheats the gravel before mixing, and can prevent the gravel from sticking to the side wall of the mixing box during mixing.

[0004] However, the above utility model still has some shortcomings:

[0005] During the use of the above-mentioned utility model, sand particles enter the sand mixing box from the material box, and the sand particles and the resin are mixed through the rotation of the transmission rod and the stirring blades. When the sand particles enter the sand mixing box from the material box, they will fall on the resin. Due to the viscosity of the resin, it is difficult for the sand particles on the upper side to pass through the resin in the middle and mix with the resin at the bottom, and the stirring effect is not ideal. In addition, the stirring blades mostly stir the resin and sand particles on the same layer, which makes it difficult to help the sand particles pass through the relatively viscous resin for mixing. Continuous and repeated stirring is required to achieve sufficient mixing between the sand particles and the resin, and the stirring efficiency is low. Utility Model Content

[0006] The utility model provides a sand mixing device for producing coated sand, aiming to solve the problems mentioned in the above background technology.

[0007] The utility model is implemented as follows: a sand mixing device for producing coated sand comprises a sand mixing box, a stirring transmission component is installed at the central position of the sand mixing box, a cleaning stirring component is connected to the stirring transmission component, and the cleaning stirring component is arranged in the sand mixing box. The stirring transmission component stirs the sand particles in the sand mixing box and helps the sand particles move downward to be mixed inside the resin.

[0008] Preferably, the stirring transmission assembly includes a stirring motor, which is installed on the top of the sand mixing box. The output shaft end of the stirring motor is connected to a stirring rod, the bottom end of the stirring rod passes through the top of the sand mixing box and is rotatably connected to the inner bottom of the sand mixing box, and the side wall of the stirring rod is connected to a spiral blade; in this solution, the spiral blade can assist in transporting the sand particles downward and stirring and mixing the resin in the lower layer.

[0009] Preferably, the cleaning and stirring assembly includes a fixed plate, the upper and lower ends of the inner wall of the fixed plate are connected to the side wall of the stirring rod through a connecting plate, and a scraper is fixedly connected to the outer wall of the fixed plate, and the scraper is tightly attached to the inner wall of the sand mixing box; in this scheme, the inner wall of the sand mixing box can be cleaned by the rotating scraper.

[0010] Preferably, a plurality of stirring blades are fixed on the inner wall of the fixed plate, the stirring blades are arranged between the two opposite connecting plates, and each of the stirring blades is provided with a plurality of stirring holes; in this scheme, the resin and sand particles at the inner edge of the mixing box can be stirred and mixed by the rotating stirring blades.

[0011] Preferably, a baffle is provided on the side wall of the stirring rod, and the baffle is fixedly connected to the inner top of the sand mixing box, and the stirring blades are inclined toward the rotation direction of the stirring rod; in this scheme, the inclined stirring blades can further assist the sand particles to be stirred and mixed downward with the resin.

[0012] Preferably, a first feed port is provided on the top of the sand mixing box, a second feed port is provided on the outer side wall of the sand mixing box, and a discharge port is provided on the bottom of the sand mixing box.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The stirring motor controls the stirring rod to drive the spiral blade to rotate, stirring and mixing the sand and resin in the center of the sand mixing box while driving the sand and resin above to be transported downward, so that the sand on the upper layer can pass through the upper viscous resin and the resin below with the help of the spiral blade to be stirred and mixed, thereby improving the stirring efficiency;

[0015] 2. During the stirring rod rotating and stirring, the connecting plate drives the fixed plate and the scraper to rotate, and the inner wall of the sand mixing box is cleaned to prevent some sand particles from sticking to the inner wall of the sand mixing box under the action of the gum;

[0016] 3. During the rotation of the fixed plate, the inclined stirring blades are simultaneously driven to stir and mix the sand and rubber at the edge of the sand mixing box, and at the same time, the sand is rotated downward for stirring and mixing, thereby further improving the stirring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of the utility model;

[0020] In the figure:

[0021] 1. Sand mixing box; 2. Baffle; 3. Feed inlet 1; 4. Feed inlet 2; 5. Support frame; 6. Discharge port; 7. Observation window;

[0022] 8. stirring transmission assembly; 81. stirring motor; 82. stirring rod; 83. spiral blade;

[0023] 9. Clean the stirring assembly; 91. Fixed plate; 92. Connecting plate; 93. Scraper; 94. Stirring blades; 95. Stirring hole. DETAILED DESCRIPTION

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0026] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See also Figure 1-3 The utility model provides a technical solution: a sand mixing device for coated sand production, including a sand mixing box 1, a stirring and transmission component 8 is installed at the central position of the sand mixing box 1, and a cleaning and stirring component 9 is connected to the stirring and transmission component 8. The cleaning and stirring component 9 is arranged in the sand mixing box 1. The stirring and transmission component 8 stirs the sand particles in the sand mixing box 1 and helps the sand particles move downward to mix inside the resin.

[0030] Specifically, the stirring and transporting assembly 8 stirs and mixes the sand and resin at the central position in the sand mixing box 1, and transports the sand that falls on the resin to the lower layer of the resin, and assists the sand to move through the upper layer of viscous resin to the lower layer for mixing;

[0031] The cleaning and stirring assembly 9 stirs and mixes the sand and resin at the inner edge of the sand mixing box 1 , and cleans the sand stuck on the inner wall of the sand mixing box 1 .

[0032] Furthermore, the stirring transmission assembly 8 includes a stirring motor 81, which is installed on the top of the sand mixing box 1. The output shaft end of the stirring motor 81 is connected to a stirring rod 82. The bottom end of the stirring rod 82 passes through the top of the sand mixing box 1 and is rotatably connected to the inner bottom of the sand mixing box 1, and a spiral blade 83 is connected to the side wall of the stirring rod 82.

[0033] Specifically, the stirring motor 81 controls the stirring rod 82 to drive the spiral blade 83 to rotate, stirring the sand and resin in the center of the sand mixing box 1 while driving the upper sand and resin downward, so that the upper sand can be more easily stirred through the viscous resin with the assistance of the spiral blade 83, thereby improving the stirring efficiency.

[0034] Furthermore, the cleaning and stirring assembly 9 includes a fixed plate 91, the upper and lower ends of the inner wall of the fixed plate 91 are connected to the side wall of the stirring rod 82 through a connecting plate 92, and a scraper 93 is fixedly connected to the outer wall of the fixed plate 91, and the scraper 93 is tightly attached to the inner wall of the sand mixing box 1.

[0035] Specifically, the left and right ends of the connecting plate 92 are respectively fixedly connected to the inner wall of the fixed plate 91 and the side wall of the stirring rod 82 (the side close to the axis of the stirring rod 82 is the inner side, and the side away from the axis of the stirring rod 82 is the outer side); when the stirring rod 82 drives the spiral blade 83 to rotate, it can simultaneously drive the fixed plate 91 and the scraper 93 to rotate through the connecting plate 92 to clean the inner wall of the sand mixing box 1 to prevent some sand particles from sticking to the inner wall of the sand mixing box 1 under the action of gum.

[0036] Furthermore, a plurality of stirring blades 94 are fixed on the inner side wall of the fixing plate 91 . The stirring blades 94 are arranged between two opposite connecting plates 92 , and each stirring blade 94 is provided with a plurality of stirring holes 95 .

[0037] Specifically, when the fixing plate 91 rotates under the action of the stirring rod 82, the stirring blades 94 are synchronously driven to stir and mix the sand and the rubber at the inner edge of the sand mixing box 1, thereby further improving the stirring efficiency.

[0038] Furthermore, a baffle plate 2 is disposed on the side wall of the stirring rod 82 , and the baffle plate 2 is fixedly connected to the inner top of the sand mixing box 1 . The stirring blades 94 are tilted toward the rotation direction of the stirring rod 82 .

[0039] Specifically, the baffle 2 is funnel-shaped and covers the spiral blade 83 below to protect the spiral blade 83, so as to prevent the sand particles from falling on the spiral blade 83 and damaging the spiral blade 83 when entering the sand mixing box 1 from the feed inlet;

[0040] like Figure 3 As shown, the stirring blades 94 are fixedly connected to the inner wall of the fixed plate 91 at an angle, and the inclination direction is set according to the rotation direction of the spiral blades 83, that is, to ensure that in the process of transmitting the sand particles above downward through the spiral blades 83, the inclined stirring blades 94 can also rotate and stir the sand particles downward, thereby further improving the stirring efficiency.

[0041] Furthermore, a feed port 1 3 is provided on the top of the sand mixing box 1 , a feed port 2 4 is provided on the outer side wall of the sand mixing box 1 , and a discharge port 6 is provided on the bottom of the sand mixing box 1 .

[0042] Specifically, the feed port 1 3 and the feed port 2 4 are respectively used to add resin and sand into the sand mixing box 1; the discharge port 6 is used to discharge the mixed sand; in addition, an observation window 7 is provided on the outer wall of the sand mixing box 1 to facilitate observation of the stirring and mixing conditions inside the sand mixing box 1; a support frame 5 is installed at the bottom of the sand mixing box 1.

[0043] Working principle and use process of the utility model: After the utility model is installed, the resin and sand grains enter the sand mixing box 1 through the feed port 1 3 and the feed port 2 4 respectively, and the stirring motor 81 controls the stirring rod 82 to drive the spiral blade 83 to rotate, stirring and mixing the sand grains and resin in the center of the sand mixing box 1 while driving the sand grains and resin above to be transported downward, so that the sand grains on the upper layer can pass through the viscous resin and the resin below with the assistance of the spiral blade 83 to be stirred and mixed;

[0044] During the rotation and stirring of the stirring rod 82, the connecting plate 92 drives the fixed plate 91 and the scraper 93 to rotate, so as to clean the inner wall of the mixing box 1, and prevent some sand grains from sticking to the inner wall of the mixing box 1 under the action of the gum; in addition, the fixed plate 91 synchronously drives the inclined stirring blades 94 to stir and mix the sand grains and the gum at the inner edge of the mixing box 1, and at the same time rotates and stirs the sand grains downward.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sand mixing device for producing coated sand, comprising a sand mixing box (1), characterized in that: A stirring transmission component (8) is installed at a central position in the sand mixing box (1), and a cleaning stirring component (9) is connected to the stirring transmission component (8). The cleaning stirring component (9) is arranged in the sand mixing box (1). The stirring transmission component (8) stirs the sand particles in the sand mixing box (1) and helps the sand particles to move downward to mix inside the resin.

2. A sand mixing device for producing coated sand according to claim 1, characterized in that: The stirring transmission assembly (8) comprises a stirring motor (81), the stirring motor (81) is installed on the top of the sand mixing box (1), the output shaft end of the stirring motor (81) is connected to a stirring rod (82), the bottom end of the stirring rod (82) passes through the top of the sand mixing box (1) and is rotatably connected to the inner bottom of the sand mixing box (1), and the side wall of the stirring rod (82) is connected to a spiral blade (83).

3. A sand mixing device for producing coated sand according to claim 2, characterized in that: The cleaning and stirring assembly (9) comprises a fixed plate (91), the upper and lower ends of the inner side wall of the fixed plate (91) are connected to the side wall of the stirring rod (82) through a connecting plate (92), and a scraper (93) is fixedly connected to the outer side wall of the fixed plate (91), and the scraper (93) is in close contact with the inner wall of the sand mixing box (1).

4. A sand mixing device for producing coated sand according to claim 3, characterized in that: A plurality of stirring blades (94) are fixed on the inner side wall of the fixing plate (91), the stirring blades (94) are arranged between two opposite connecting plates (92), and each stirring blade (94) is provided with a plurality of stirring holes (95).

5. A sand mixing device for producing coated sand according to claim 4, characterized in that: The side wall of the stirring rod (82) is covered with a baffle (2), and the baffle (2) is fixedly connected to the inner top of the sand mixing box (1). The stirring blades (94) are inclined toward the rotation direction of the stirring rod (82).

6. A sand mixing device for producing coated sand according to claim 1, characterized in that: The top of the sand mixing box (1) is provided with a first feed port (3), the outer side wall of the sand mixing box (1) is provided with a second feed port (4), and the bottom of the sand mixing box (1) is provided with a discharge port (6).

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