CN112247067A

CN112247067A - Sand mixing mechanism and 3D printer

Info

Publication number: CN112247067A
Application number: CN202011027791.9A
Authority: CN
Inventors: 马玺; 何捷军; 麦恒嘉; 闫涛
Original assignee: Kocel Intelligent Foundry Industry Innovation Center Co Ltd
Current assignee: Kocel Intelligent Foundry Industry Innovation Center Co Ltd
Priority date: 2020-09-26
Filing date: 2020-09-26
Publication date: 2021-01-22

Abstract

The invention relates to a sand mulling device and a 3D printer. The 3D printer includes the mulling device. The sand mulling device comprises: the sand mixing tank is provided with a sand inlet and a sand outlet; the sand mulling mechanism comprises a rotating shaft, blades and a rotary driving piece, the rotating shaft is installed at the bottom of an inner cavity of the sand mulling tank, the blades are installed on the rotating shaft, and the rotary driving piece is installed on the sand mulling tank and is in rotary connection with the rotating shaft; scraper mechanism, scraper mechanism includes scraper blade and the scraper blade driving piece that the drive is connected, the scraper blade is close to mix the inner wall setting of sand jar for scrape go mix the adnexed sand material of sand jar inner wall, the scraper blade driving piece set up in mix the lateral wall of sand jar. The sand mulling device and the 3D printer can realize timely sand cleaning and can realize an even sand mulling effect.

Description

Sand mixing mechanism and 3D printer

Technical Field

The invention relates to the technical field of 3D printing, in particular to a sand mulling mechanism and a 3D printer.

Background

The printing principle of the conventional sand mold 3D printing equipment is that a sand paver lays sand mixed with a curing agent on a bottom plate of a working box, a printing head sprays resin on a sand surface according to a certain requirement, and then the curing agent in the sand and the resin perform a chemical reaction to mold the sand and realize the rapid manufacturing of a sand core. The setting speed of the sand core and the strength of the sand core during 3D printing are closely related to the content and uniformity of the curing agent contained in the sand. When the content of the local curing agent in the sand is high, the local hardening of the sand core is fast, the service life is shortened, but the sand falling of a sand spreader is not smooth, so that the printing quality of the sand core is influenced; when the sand has a low content of the local curing agent, the sand core is slowly hardened, the reaction of the curing agent and the resin is insufficient, and the strength of the sand core is low. Therefore, the sand mixing uniformity of the sand mixing device has great influence on the printing process and the quality of the sand core.

Disclosure of Invention

Based on this, it is necessary to provide a sand mulling device and a 3D printer that can realize timely sand cleaning and can realize even sand mulling effect to the relatively poor problem of sand mulling device among the prior art.

A sand mulling apparatus, said mulling apparatus comprising: the sand mixing tank is provided with a sand inlet and a sand outlet; the sand mulling mechanism comprises a rotating shaft, blades and a rotary driving piece, the rotating shaft is installed at the bottom of an inner cavity of the sand mulling tank, the blades are installed on the rotating shaft, and the rotary driving piece is installed on the sand mulling tank and is in rotary connection with the rotating shaft; scraper mechanism, scraper mechanism includes scraper blade and the scraper blade driving piece that the drive is connected, the scraper blade is close to mix the inner wall setting of sand jar for scrape go mix the adnexed sand material of sand jar inner wall, the scraper blade driving piece set up in mix the lateral wall of sand jar.

In one embodiment, the scraper is arranged at the top of the sand mixing tank and is spaced from the blades.

In one embodiment, the scrapers are arranged on the inner cavity wall of the sand mixing tank at intervals of 90 degrees with the blades.

In one embodiment, the blade and the blade are driven in the same direction of rotation.

In one embodiment, the blade includes a connecting portion and swinging blades protruding from two ends of the connecting portion, and the connecting portion is rotatably disposed on the rotating shaft.

In one embodiment, the opposite surfaces of the two oscillating blades are inclined surfaces.

In one embodiment, a surface of the connecting portion facing the oscillating blade also has an inclined surface.

In one embodiment, the blade is of a turbine-type construction.

In one embodiment, the sand mulling device further comprises a swing mechanism, the swing mechanism comprises a support, a swing driving piece and a bearing, the support bears the sand mulling tank, the swing driving piece is rotatably connected with a rotating shaft of the sand mulling tank, and the bearing is arranged between the support and the rotating shaft of the sand mulling tank.

In one embodiment, the number of the brackets is two, and the sand mixing tank is rotatably arranged between the two brackets.

In one embodiment, an angle sensor is arranged on a rotating shaft of the sand mixing tank.

A3D printer comprises a sand mulling device.

Above-mentioned mulling device and 3D printer, the sand material gets into through the sand inlet of mulling jar, through the rotating shaft installation blade in the mulling jar, and adopt rotary driving piece drive blade to be rotary motion in the mulling jar, thereby realize evenly, the sand material in the high-efficient mulling jar, further inner wall through at the mulling jar sets up the scraper blade, thereby can realize in time scraping the adnexed sand material of mulling jar inner wall, thereby be favorable to the homogeneity that the sand material mixes more, be favorable to promoting the mulling effect, finally discharge through the sand material that goes out the sand mouth and will mix.

Drawings

Fig. 1 is a schematic structural view of a sand mulling apparatus according to an embodiment.

Fig. 2 is a schematic structural view of a sand mulling apparatus of another embodiment.

Fig. 3 is a schematic structural view of the blade and the scraper disposed in the sand mulling tank according to an embodiment.

Fig. 4 is a schematic structural view of a sand mulling apparatus according to yet another embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In one embodiment, the sand mixing device comprises a sand mixing tank, wherein the sand mixing tank is provided with a sand inlet and a sand outlet; the sand mulling mechanism comprises a rotating shaft, blades and a rotary driving piece, the rotating shaft is installed at the bottom of an inner cavity of the sand mulling tank, the blades are installed on the rotating shaft, and the rotary driving piece is installed on the sand mulling tank and is in rotary connection with the rotating shaft; scraper mechanism, scraper mechanism includes scraper blade and the scraper blade driving piece that the drive is connected, the scraper blade is close to mix the inner wall setting of sand jar for scrape go mix the adnexed sand material of sand jar inner wall, the scraper blade driving piece set up in mix the lateral wall of sand jar.

In one embodiment, the 3D printer comprises the sand mixing device, the sand mixing device comprises a sand mixing tank, and the sand mixing tank is provided with a sand inlet and a sand outlet; the sand mulling mechanism comprises a rotating shaft, blades and a rotary driving piece, the rotating shaft is installed at the bottom of an inner cavity of the sand mulling tank, the blades are installed on the rotating shaft, and the rotary driving piece is installed on the sand mulling tank and is in rotary connection with the rotating shaft; scraper mechanism, scraper mechanism includes scraper blade and the scraper blade driving piece that the drive is connected, the scraper blade is close to mix the inner wall setting of sand jar for scrape go mix the adnexed sand material of sand jar inner wall, the scraper blade driving piece set up in mix the lateral wall of sand jar.

The sand mixing device is described below with reference to specific embodiments to further understand the inventive concept of the sand mixing device. Referring to fig. 1, a sand mixing device 10, the sand mixing device 10 includes a sand mixing tank 100, a sand mixing mechanism 200, and a scraper mechanism 300. Specifically, the sand mixing tank is provided with a sand inlet 110 and a sand outlet 120, wherein the sand inlet 110 is arranged at the top of the sand mixing tank, and the sand outlet 120 is arranged near the bottom of the sand mixing tank. Optionally, the sand inlet 110 and the sand outlet 120 are respectively provided with a sand baffle. Wherein, the sand baffle can be a solenoid valve or a pneumatic valve. When the sand adding or shakeout is needed, the corresponding sand adding or shakeout operation can be correspondingly executed by controlling the sand baffle. Specifically, the sand mulling mechanism 200 includes a rotating shaft 210, blades 220 and a rotary driving member 230, wherein the rotating shaft 210 is installed at the bottom of the inner cavity of the sand mulling tank 100, the blades 220 are installed on the rotating shaft 210, and the rotary driving member 230 is installed on the sand mulling tank 100 and is rotatably connected to the rotating shaft 210. Alternatively, the rotary driving member 230 is a motor or a cylinder, which is installed outside the bottom of the mulling tank, the rotary shaft 210 is a rotary shaft of the motor or the cylinder, which is installed in an inner cavity at the bottom of the mulling tank, and the blades can stir and mix the sand in the mulling tank by being installed on the rotary shaft 210. Specifically, the scraper mechanism 300 includes a scraper 310 and a scraper driving member 320 which are in driving connection, the scraper 310 is close to the inner wall of the sand mixing tank 100 and is used for scraping off the sand attached to the inner wall of the sand mixing tank, and the scraper driving member 320 is arranged on the side wall of the sand mixing tank. That is, the sand mixing tanks of the scrapers 310 are disposed at a small distance apart or in contact, thereby facilitating scraping off the sand on the sand mixing tanks. Alternatively, the blade drive 320 is a motor (gear motor) or a cylinder, which is mounted to the outside wall of the top of the fracturing blender jar. Optionally, the scraper 310 is disposed on the top of the sand mixing tank 100 and spaced apart from the blades 220. That is, the scraping plate 310 is accommodated at the top of the inner cavity of the sand mixing tank 100 and has a certain distance from the blade 220, so that the two will not affect each other when rotating, and scraping can be performed during the sand mixing process.

Referring to fig. 2, in one embodiment, the scraper 310 includes a beam 311 and scrapers 312 disposed at two ends of the beam, wherein the beam 311 is drivingly connected to a scraper driving member 320. Specifically, two wipers 312 are disposed near the side wall of the sand mixing tank, with a clearance therebetween. Thus, when there is adhered sand on the sidewall of the sand mixing tank, the scraper blade 312 will press and rub the sand on the sidewall of the sand mixing tank under the action of the driving force during the movement, thereby achieving the effect of scraping the sand.

Referring also to fig. 3, in one embodiment, the scrapers 310 are disposed on the inner cavity wall of the sand mixing tank at 90 degrees intervals with the blades 220. Specifically, the scraping plates 310 are provided in plurality with the blades 220, and two adjacent scraping plates 310 form an included angle of 90 degrees with the blades 220. After the two are rotated and started, the scraper can effectively remove sand materials on the sand mixing tank in the sand mixing process. Alternatively, the blade 310 and the blade 220 are driven in rotation in the same direction. Namely, the two rotate in the same direction, thus being beneficial to reducing the abrasion to the sand material in different directions in the sand mixing process and ensuring the quality of the sand material.

Referring to fig. 4, in one embodiment, the vane 220 includes a connecting portion 221 and a swinging vane 222 protruding from two ends of the connecting portion, and the connecting portion 221 is rotatably disposed on the rotating shaft 210. That is, the connecting portion 221 is configured to mount the rotary shaft 210, and the swing blade 222 is mainly used to mix the sand. Specifically, the surfaces of the two oscillating blades 221 facing each other are inclined surfaces. Thus, the sand material can fall through the inclined plane in time in the stirring process when being mixed with sand, and the sand material is reduced to be attached to the side wall of the sand mixing tank. Further, the connecting portion 221 has an inclined surface on a surface facing the oscillating blade 222. Like this, connecting portion 221 and swing leaf 222 all form the structure of hopper-shaped bearing sand material through setting up the inclined plane for the blade is at the rotation in-process, and the sand material can realize the stirring in this hopper-shaped structure, further reduces the probability that the sand material is attached to sand mixing tank inner wall. It should be noted that the blade structure of this example is formed by bending integrally. In an alternative embodiment, the blades 220 are of a turbine-type construction. It should be noted that the turbine blade of this structure needs to be welded. Through setting up turbine formula structure blade also help reducing the probability that sand material is attached to muddy sand jar inner wall. The vanes of the two structures force the sand to diffuse outwards in the rotating process, and then the sand moves axially and circumferentially under the action of an inclined surface of each vane, so that the sand is mixed.

In one embodiment, the sand mulling device further includes a swing mechanism 400, the swing mechanism includes a bracket 410, a swing driving member 420, and a bearing 430, the bracket 410 carries the sand mulling tank 100, the swing driving member 420 is rotatably connected to a rotating shaft of the sand mulling tank 100, and the bearing 430 is disposed between the bracket 140 and the rotating shaft of the sand mulling tank 100. Optionally, there are two brackets 410, and the sand mixing tank 100 is rotatably disposed between the two brackets 410. Specifically, the rotation through-hole has been seted up on the upper portion of support 410, is provided with bearing 430 in this through-hole, and this through-hole is worn to locate by the axis of rotation that sets up on the sand mixing tank 100, and swing driving piece 420 is connected with this axis of rotation drive for the axis of rotation rotates in bearing 430 under the effect of swing driving piece 420, thereby drives sand mixing tank 100 horizontal hunting, thereby realizes carrying out the sand material in it and mixes from top to bottom, improves the mixed condition of grit and curing agent, improves the sand mixing homogeneity. Further, the sand mulling mechanism and the swing mechanism 400 may be simultaneously started, so that the sand mulling efficiency may be improved and the sand mulling time may be shortened by the combined rotation of the swing sand mulling tank 100 and the blades 220. After the sand mixing is finished, the blade 220 stops rotating, the sand mixing tank body 100 stops swinging, the baffle at the sand outlet of the sand mixing tank is opened, and the mixed sand is discharged out of the sand mixing tank.

In one embodiment, an angle sensor 440 is disposed on the rotating shaft of the sand mixing tank 100. Thus, the sand mixing tank 100 can meet the requirements of each sand mixing stage through the control of the swing driving piece 420 and the angle sensor 440 in the swing process, and can realize swing with variable frequency and variable angle, thereby being beneficial to improving the uniformity of sand mixing.

In one embodiment, a 3D printer includes the sand mulling device of any of the above embodiments.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A sand mulling apparatus, said sand mulling apparatus comprising:

the sand mixing tank is provided with a sand inlet and a sand outlet;

the sand mulling mechanism comprises a rotating shaft, blades and a rotary driving piece, the rotating shaft is installed at the bottom of an inner cavity of the sand mulling tank, the blades are installed on the rotating shaft, and the rotary driving piece is installed on the sand mulling tank and is in rotary connection with the rotating shaft;

scraper mechanism, scraper mechanism includes scraper blade and the scraper blade driving piece that the drive is connected, the scraper blade is close to mix the inner wall setting of sand jar for scrape go mix the adnexed sand material of sand jar inner wall, the scraper blade driving piece set up in mix the lateral wall of sand jar.

2. The sand mulling apparatus of claim 1, wherein the scraper is disposed at a top of the mulling tank and spaced from the blade.

3. The sand mixing device according to claim 2, wherein the scraper is arranged on the inner cavity wall of the sand mixing tank at a 90-degree interval from the blade.

4. A sand mixing device according to claim 1, characterised in that the scraper and the blades are driven in rotation in the same direction.

5. The sand mulling device according to claim 1, wherein the blade comprises a connecting part and swinging blades convexly arranged at two ends of the connecting part, and the connecting part is rotatably arranged on the rotating shaft.

6. A sand mixing device according to claim 5, wherein the opposite surfaces of the two oscillating blades are inclined surfaces.

7. A sand mixing device according to claim 6, wherein a surface of the connecting portion facing the oscillating blade also has an inclined surface.

8. A sand mixing device according to claim 1, characterised in that the blades are of a turbine-type construction.

9. The sand mulling device according to claim 1, further comprising a swing mechanism, wherein the swing mechanism comprises a bracket, a swing driving member and a bearing, the bracket carries the sand mulling tank, the swing driving member is rotatably connected with a rotating shaft of the sand mulling tank, and the bearing is arranged between the bracket and the rotating shaft of the sand mulling tank.

10. A sand mixing device according to claim 9, characterised in that the number of the brackets is two, and that the sand mixing tank is rotatably arranged between the two brackets.

11. A sand mixing device according to claim 9, characterised in that an angle sensor is arranged on the rotating shaft of the sand mixing tank.

12. 3D printer characterized in that it comprises a sand mixing device according to any one of claims 1 to 11.