Sand mixer sand mixing device

Abstract

This utility model provides a sand mixing device for a sand mixer, including a cylinder, a mixing shaft, and mixing blades. The mixing shaft is located inside the cylinder and rotatably connected to it. Multiple mixing blades are evenly arranged along the outer circumference of the mixing shaft. The inner ends of the mixing blades are detachably connected to the mixing shaft and mounted on it. The outer ends of the mixing blades are equipped with scrapers, which are inclined and fit against the inner wall and bottom surface of the cylinder. The mixing blades of this utility model have a split, detachable structure, facilitating later maintenance and reducing manufacturing costs. Furthermore, the multiple mixing blades working in conjunction with the scrapers improve sand mixing, resulting in more efficient sand turbulence, uniform mixing, good mixing effect, and stable and reliable quality of the mixed molding sand.

Description

Technical Field

[0001] This utility model relates to the field of sand core manufacturing mixing machine technology, and in particular to a sand mixing device for a sand mixing machine. Background Technology

[0002] In the foundry industry, core preparation is a crucial component of the casting process. The core preparation involves uniformly mixing raw sand, binder, and molding aids to create molding sand (or core sand). Currently, a sand mixer is typically used to perform this mixing step.

[0003] The quality of sand mixing in a sand mixer largely depends on its mixing device. Existing mixing devices are complex in structure, such as integrated spiral blades, which are difficult to manufacture, have high production costs, and are not conducive to mass production. Furthermore, integrated spiral blades are generally welded to the mixing shaft; if damaged, the entire mixing shaft must be replaced, resulting in high maintenance costs. In addition, some mixing devices have simple structures, but their sand mixing uniformity is poor, leading to abnormal sand quality and a low rate of qualified sand cores, resulting in waste of materials and manpower. Utility Model Content

[0004] The present invention aims to provide a sand mixing device for a sand mixer to overcome the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a sand mixing device for a sand mixer, comprising a cylinder, a sand mixing shaft, and sand mixing blades. The sand mixing shaft is disposed inside the cylinder and is rotatably connected to the cylinder. Multiple sand mixing blades are provided and are evenly arranged along the outer circumference of the sand mixing shaft. The inner end of the sand mixing blade is mounted on the sand mixing shaft and is detachably connected to the sand mixing shaft. The outer end of the sand mixing blade is provided with a scraper. The scraper is inclined and fits against the inner wall and bottom surface of the cylinder.

[0006] Furthermore, in the aforementioned sand mixing device, the sand mixing blades are semi-circular arc-shaped structures composed of multiple arc segments.

[0007] Furthermore, in the aforementioned sand mixing device, the height of the sand mixing blades gradually decreases along the direction from the inside to the outside of the cylinder.

[0008] Furthermore, in the aforementioned sand mixing device, the outer periphery of the sand mixing shaft is provided with mounting grooves corresponding to the sand mixing blades. The inner ends of the sand mixing blades are embedded in the mounting grooves and connected to the mounting holes located at the bottom of the mounting grooves by fasteners.

[0009] Furthermore, in the aforementioned sand mixing device, the scraper is detachably connected to the mixing blade via a connecting assembly. The connecting assembly includes a fixed clamping block, a movable clamping block, and a clamping rod. The fixed clamping block is fixed on the side of the mixing blade end that is close to the inner wall of the cylinder. The movable clamping block is arranged opposite to the fixed clamping block and is fixedly connected to the fixed clamping block by fasteners. A clamping groove is provided on the side of the movable clamping block that is opposite to the fixed clamping block. The upper end of the clamping rod is connected to the scraper, and the lower end is inserted into the clamping groove.

[0010] Furthermore, in the aforementioned sand mixing device, the scraper is made of stainless steel or tungsten steel.

[0011] Furthermore, in the aforementioned sand mixing device, the mixing blades are made of stainless steel or manganese steel.

[0012] Furthermore, in the aforementioned sand mixing device, the inner arm and bottom surface of the cylinder are provided with wear-resistant liners, preferably made of ultra-high molecular weight polyethylene.

[0013] Furthermore, in the aforementioned sand mixing device, the sand mixing shaft is rotatably connected to the cylinder via a drive assembly. The drive assembly includes a geared motor, a drive shaft, a bearing seat, and a connecting rod. The geared motor is fixed to the bottom of the cylinder via a mounting base. The bearing seat is fixed at the bottom center of the cylinder and is sleeved on the outside of the drive shaft and rotatably connected to it. The lower end of the drive shaft is connected to the geared motor, and the upper end of the drive shaft is a prismatic prism inserted into the sand mixing shaft and connected to it via a connecting rod.

[0014] Furthermore, the aforementioned sand mixing device also includes an end plate. The bottom of the sand mixing shaft is suspended from the bottom surface of the cylinder, and the bottom of the sand mixing shaft is provided with an annular groove. The end plate is located at the middle of the bottom of the cylinder, covering the bearing seat, and the top of the end plate is provided with an annular boss protruding from the bottom surface of the cylinder. The annular boss is inserted into the annular groove and has a clearance fit with the annular groove. Preferably, a sealing ring is provided below the end plate and embedded in the bearing seat.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the sand mixing blade of this utility model is a split and detachable structure, which facilitates later maintenance and reduces manufacturing costs. Moreover, the multiple sand mixing blades work together with the scraper to mix sand, which makes the sand tumbling more favorable during the mixing process, resulting in uniform sand mixing, good sand mixing effect, and stable and reliable quality of the mixed molding sand. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the sand mixing device of the sand mixer of this utility model;

[0018] Figure 2 This is a top view of the sand mixing device of the sand mixer of this utility model;

[0019] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure at section A;

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the B-section structure;

[0021] Figure 5 This is a partial structural schematic diagram of the sand mixing device of the sand mixer of this utility model;

[0022] In the diagram: 1. Cylinder; 2. Sand mixing shaft; 21. Mounting groove; 22. Annular groove; 3. Sand mixing blade; 4. Scraper; 41. Fixed clamping block; 42. Movable clamping block; 43. Clamping rod;

[0023] 5. Drive assembly; 51. Gear motor; 52. Drive shaft; 53. Bearing housing; 54. Connecting rod; 6. End plate; 61. Annular boss; 7. Sealing ring. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] like Figure 1-5As shown, a sand mixing device for a sand mixer includes a cylinder 1, a mixing shaft 2, and mixing blades 3. The mixing shaft 2 is located inside the cylinder 1 and is rotatably connected to the cylinder 1. The upper end of the mixing shaft is conical. Multiple mixing blades 3 are evenly arranged along the outer circumference of the mixing shaft 2. In this embodiment, three mixing blades 3 are provided. The inner end of each mixing blade 3 is mounted on the mixing shaft 2 and detachably connected to it. A scraper 4 is provided at the outer end of each mixing blade 3. The scraper 4 is inclined and fits against the inner wall and bottom surface of the cylinder 1. The surface where the scraper 4 fits against the inner wall of the cylinder 1 is arc-shaped, resulting in good scraping effect and preventing the mixture from sticking to the cylinder 1. The mixing blades 3 of this invention have a split, detachable structure, facilitating later maintenance and reducing manufacturing costs. Furthermore, the multiple mixing blades and scraper work together to achieve more uniform sand mixing, resulting in a better mixing effect and stable and reliable quality of the mixed molding sand.

[0027] like Figure 1 , 2 As shown, the sand mixing blade 3 is a semi-circular arc structure composed of multiple arc segments. In this embodiment, the sand mixing blade 3 includes arcs at both ends, which is relatively simple to manufacture. Furthermore, the height of the sand mixing blade 3 gradually decreases along the direction from the inside to the outside of the cylinder 1, thereby achieving a better sand mixing effect.

[0028] like Figure 4 , 5 As shown, the outer periphery of the sand mixing shaft 2 is provided with mounting grooves 21 corresponding to the sand mixing blades 3. The inner end of the sand mixing blade 3 is embedded in the mounting groove 21 and connected to the mounting hole located at the bottom of the mounting groove 21 by fasteners. This facilitates installation and ensures accurate installation position.

[0029] like Figure 5 As shown, the scraper 4 is detachably connected to the sand mixing blade 3 via a connecting assembly. The connecting assembly includes a fixed clamping block 41, a movable clamping block 42, and a clamping rod 43. The fixed clamping block 41 is fixed on the side of the end of the sand mixing blade 3 that is close to the inner wall of the cylinder 1. The movable clamping block 42 is arranged opposite to the fixed clamping block 41 and is fixedly connected to the fixed clamping block 41 by fasteners. The side of the movable clamping block 42 that is opposite to the fixed clamping block 41 is provided with a clamping groove. The upper end of the clamping rod 43 is connected to the scraper 4, and the lower end is inserted into the clamping groove. The structure is simple and easy to assemble and disassemble.

[0030] The scraper 4 is made of stainless steel or tungsten steel, and the sand mixing blade 3 is made of stainless steel or manganese steel. The sand mixing blade 3 and the scraper 4 have a long service life, reducing the replacement frequency.

[0031] In addition, the inner arm and bottom surface of the cylinder 1 are provided with wear-resistant liners, which can be made of ultra-high molecular weight polyethylene.

[0032] Among them, such as Figure 3 ,4 As shown, the sand mixing shaft 2 is rotatably connected to the cylinder 1 via a drive assembly 5. The drive assembly 5 includes a reduction motor 51, a drive shaft 52, a bearing seat 53, and a connecting rod 54. The reduction motor 51 is fixed to the bottom of the cylinder 1 via a mounting base. The bearing seat 53 is fixed at the bottom center of the cylinder 1 and is sleeved on the outside of the drive shaft 52 and rotatably connected to the drive shaft 52. The lower end of the drive shaft 52 is connected to the reduction motor 51, and the upper end of the drive shaft 52 is a prismatic prism inserted into the sand mixing shaft 2. The prismatic prism can be a triangular prismatic prism, a square body, a polygonal body, etc. The drive shaft 52 is connected to the sand mixing shaft 2 via the connecting rod 54. Specifically, the connecting rod 54 is inserted into the sand mixing shaft 2, with its lower end threadedly connected to the drive shaft 52 and its upper end extending out of the top of the sand mixing shaft 2 and fixedly connected to the sand mixing shaft 2 via a cap nut, thus sealing the top of the sand mixing shaft 2. This facilitates installation and prevents the mixture from entering the interior of the sand mixing shaft.

[0033] The aforementioned sand mixing device also includes an end plate 6. The bottom of the sand mixing shaft 2 is suspended from the bottom surface of the cylinder 1 to avoid friction between the bottom of the sand mixing shaft 2 and the cylinder 1, thereby extending the service life of the sand mixing shaft 2 and improving the sand mixing stability. The bottom of the sand mixing shaft 2 is provided with an annular groove 22. The end plate 6 is located in the middle of the bottom of the cylinder 1, covering the bearing seat 53. The top of the end plate 6 is provided with an annular boss 61 protruding from the bottom surface of the cylinder 1. The annular boss 61 is inserted into the annular groove 22 and has a clearance fit with the annular groove 22. This can prevent material from leaking from the middle of the cylinder 1 and improve the sealing performance. Furthermore, a sealing ring 7 is provided below the end plate 6 and embedded in the bearing seat 53 to further improve the sealing performance and ensure the working stability of the drive component.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sand mixing device for a sand mixer, characterized in that: The device includes a cylinder, a sand mixing shaft, and sand mixing blades. The sand mixing shaft is located inside the cylinder and is rotatably connected to the cylinder. Multiple sand mixing blades are provided and are evenly arranged along the outer circumference of the sand mixing shaft. The inner end of each sand mixing blade is mounted on the sand mixing shaft and is detachably connected to the sand mixing shaft. The outer end of each sand mixing blade is provided with a scraper. The scraper is inclined and fits against the inner wall and bottom surface of the cylinder.

2. The sand mixing device of the sand mixer according to claim 1, characterized in that: The sand-mixed blade is a semi-circular arc structure composed of multiple arc segments.

3. The sand mixing device of the sand mixer according to claim 1 or 2, characterized in that: The height of the sand-mixing blades gradually decreases along the direction from the inside to the outside of the cylinder.

4. The sand mixing device of the sand mixer according to claim 1, characterized in that: The outer periphery of the sand mixing shaft is provided with mounting grooves that correspond one-to-one with the sand mixing blades. The inner end of the sand mixing blade is embedded in the mounting groove and connected to the mounting hole located at the bottom of the mounting groove by fasteners.

5. The sand mixing device of the sand mixer according to claim 1, characterized in that: The scraper is detachably connected to the sand-mixing blade via a connecting assembly. The connecting assembly includes a fixed clamping block, a movable clamping block, and a clamping rod. The fixed clamping block is fixed on the side of the sand-mixing blade that is close to the inner wall of the cylinder. The movable clamping block is arranged opposite to the fixed clamping block and is fixedly connected to the fixed clamping block by fasteners. The side of the movable clamping block that is opposite to the fixed clamping block is provided with a clamping groove. The upper end of the clamping rod is connected to the scraper, and the lower end is inserted into the clamping groove.

6. The sand mixing device of the sand mixer according to claim 1, characterized in that: The scraper is made of stainless steel or tungsten steel.

7. The sand mixing device of the sand mixer according to claim 1, characterized in that: The sand-mixing blades are made of stainless steel or manganese steel.

8. The sand mixing device of the sand mixer according to claim 1, characterized in that: The inner side arm and bottom surface of the cylinder are provided with wear-resistant lining plates.

9. The sand mixing device of the sand mixer according to claim 1, characterized in that: The sand mixing shaft is rotatably connected to the cylinder via a drive assembly. The drive assembly includes a geared motor, a drive shaft, a bearing housing, and a connecting rod. The geared motor is fixed to the bottom of the cylinder via a mounting base. The bearing housing is fixed at the bottom center of the cylinder and is sleeved on the outside of the drive shaft and rotatably connected to it. The lower end of the drive shaft is connected to the geared motor, and the upper end of the drive shaft is a prismatic prism inserted into the sand mixing shaft and connected to it via a connecting rod.

10. The sand mixing device of the sand mixer according to claim 9, characterized in that: It also includes an end plate. The bottom of the sand mixing shaft is suspended and connected to the bottom surface of the cylinder. The bottom of the sand mixing shaft is provided with an annular groove. The end plate is located at the middle of the bottom of the cylinder, covering the bearing seat. The top of the end plate is provided with an annular boss protruding from the bottom surface of the cylinder. The annular boss is inserted into the annular groove and is in clearance fit with the annular groove.

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