CN211638222U

CN211638222U - Tectorial membrane molding sand regeneration system

Info

Publication number: CN211638222U
Application number: CN201921977092.3U
Authority: CN
Inventors: 赵伟石; 吴学庆; 陈国兴
Original assignee: Guizhou Metallurgy Science Research Department; Guiyang Baiyun Alloy Casting Plant
Current assignee: Guizhou Metallurgy Science Research Department; Guiyang Baiyun Alloy Casting Plant
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-10-09
Anticipated expiration: 2029-11-15

Abstract

The utility model discloses a tectorial membrane molding sand regeneration system, including lifting machine, feed bin, classifying screen I, magnet separator, the vibration promotion that connects gradually burning furnace and cooler, the feed bin is sent into through the lifting machine to the waste sand after the breakage, after classifying screen screening and magnet separator magnetic separation deironing again, gets into the vibration promotion with the sand grain and forges burning furnace and carry out heat treatment, and the sand grain that obtains after the processing is sent into the cooler and is cooled off, the utility model discloses an equipment drops into fewly, and occupation of land is little, and the waste gas volume is few, and is friendly to the environment, can realize the recovery of miniaturized tectorial membrane sand, is particularly suitable for middle-size and small.

Description

Tectorial membrane molding sand regeneration system

Technical Field

The utility model relates to a belong to the iron and steel casting field, in particular to tectorial membrane molding sand regeneration system.

Background

The reclaimed sand is silica sand, precious pearl sand, ceramic sand and the like which are used in the casting industry and processed to have service performance and value again, and can be recycled as the base material of coated molding sand or other sand products. China is a world-wide casting country, and the resource consumption and the environmental pollution caused by direct waste of waste molding sand are extremely remarkable. Therefore, the regeneration of the waste molding sand is a main way for solving the problem, and has great practical significance for realizing green sustainable development of the casting industry in China.

The regeneration of used sand starts in 1912, and has been already over 90 years of history so far, and dry regeneration, wet regeneration and thermal regeneration processes are developed successively.

(1) Dry regeneration

Dry regeneration is further classified into centrifugal, air-flow, vibration, rubbing, and the like. Centrifugal and airflow type regeneration is to accelerate used sand grains to a certain speed by using mechanical centrifugal force and high-pressure air flow, and to regenerate the used sand by means of the friction between sand grains and metal components or between sand grains. The vibration type regeneration is that under the action of vibration force, the machine body filled with the old sand blocks continuously vibrates, so that impact and friction among the sand blocks and impact and friction between the sand blocks and the inner wall of the vibrating body are caused, the sand blocks are broken, and the old sand grains are regenerated. The rubbing regeneration is to regenerate used sand by strong friction between sand grains and members.

The main advantages of dry regeneration are: the device has simple structure, less investment, quick effect, easy realization and no secondary pollution. Its main disadvantages are: the residual binder film on the old sand particles can not be completely removed, the quality of the regenerated sand is not too high, the equipment components are worn, the sand particles are broken, and the like. And the higher the stripping rate of used sand grains (i.e. the better the quality of reclaimed sand), the greater the impact force and friction required, the more severe the grinding of equipment components and the crushing of sand grains.

(2) Wet regeneration

The wet regeneration is to utilize the dissolving and scrubbing action of water and the mechanical stirring action, and is to crack, dissolve, fall off or remove the residual binder film in the used sand.

The main advantages of wet regeneration are: the sand has good regeneration effect on the used sand of some water-soluble binders, the quality of the regenerated sand is good, the sand can be used as facing sand, and the regeneration efficiency of the used sand is high. Its main disadvantages are: the energy consumption is great, and area is great, and has sewage treatment scheduling problem. The combination of wet regeneration and wet cleaning has good comprehensive effect, and the latest research shows that the ester hardened sodium silicate old sand is very suitable for wet regeneration, while the resin sand has poor effect.

(3) Thermal regeneration

The thermal regeneration is a regeneration method which takes natural gas, coal gas, diesel oil, coal oil and the like as fuels and heats old sand to the temperature of 650-900 ℃ through a roasting furnace so as to remove combustible resin residues on the old sand. The thermal regeneration method has the advantages of good regeneration effect on the organic binder sand, cleaner removal of residual binder, good thermal stability of the regenerated sand, restoration of original particle size distribution, high equipment investment, high cost and high energy consumption. At present, a boiling combustion method and a rotary kiln method are mainly used.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a tectorial membrane molding sand regeneration system, it drops into greatly to solve current recovery plant, and fuel consumption is high, and the waste gas volume is big, and equipment drops into with high costsly, the big problem of area.

The utility model aims at realizing through the following technical scheme:

the utility model discloses a tectorial membrane molding sand regeneration system, including lifting machine, feed bin, classifying screen I, magnet separator, the vibration promotion that connects gradually burning furnace and cooler, the feed bin is sent into through the lifting machine to the waste sand after the breakage, after classifying screen I screening and magnet separator magnetic separation deironing again, gets into the vibration promotion with the sand grain and forges burning furnace and carry out heat treatment, and the sand grain that obtains after the processing is sent into the cooler and is cooled off.

Particularly, the system further comprises a grading sieve II, a lifting machine I, a lifting machine II, a high-position coarse sand bin and a high-position fine sand bin, the cooled regenerated sand is graded by the grading sieve II to obtain coarse sand and fine sand, and the coarse sand and the fine sand are respectively conveyed to the high-position coarse sand bin and the high-position fine sand bin to be stored through the lifting machine I and the lifting machine II.

Particularly, the vibration lifting calcining furnace comprises a frame, wherein a base is arranged on the frame, a spring is arranged between the frame and the base, and a vibration motor is arranged on the base; the machine base is provided with a spiral track along the vertical direction and used for guiding materials to jump and rise along the spiral track, and the middle part of the track is provided with a tubular calcining furnace.

Particularly, the calcining furnace is sequentially provided with an outer shell layer, a heat insulation layer and an electric heating layer from outside to inside, the lower part of the vibration lifting calcining furnace is provided with a sand inlet, and the upper part of the vibration lifting calcining furnace is provided with a sand outlet.

Particularly, a distance of 10-15 mm is kept between the innermost side of the tubular calcining furnace and the spiral track.

The utility model has the advantages that: the boiling method, the gyration method need use fuel burning to produce heat radiation and gas as heat transfer medium in the past, simultaneously, in order to guarantee that the burning of residual resin is complete, need to blow into excessive air, the waste gas production is huge, so need heat recovery system to utilize, therefore the equipment is huge, the heat utilization rate is limited, and the utility model solves the problems, the tectorial membrane sand is under the vibration of the vibration lifting machine, the spiral rising of tectorial membrane sand, and enter into the tubular calcining furnace to heat up gradually, oxidize the resin under 700 ℃ -800 ℃ high temperature, the sand beating strengthens the contact with air under the vibration, is favorable for the oxidation of the resin layer, simultaneously, the friction between the sand grains, between the sand grains and the equipment, also is favorable for the peeling and burning of the resin layer, the utility model discloses an equipment input is few, takes up a small area of land, the waste gas volume is few, friendly to the environment, can realize the, is particularly suitable for small and medium-sized casting enterprises.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of the system connection of the present invention;

fig. 2 is a schematic diagram of the structure of the vibration lifting calcining furnace of the utility model.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.

As shown in fig. 1, the utility model discloses a tectorial membrane molding sand regeneration system, including lifting machine 1, feed bin 2, classifying screen I3, magnet separator 4, the vibration promotion that connect gradually calcine stove 5 and cooler 6, the waste sand after the breakage sends into feed bin 2 through lifting machine 1, after classifying screen I3 sieves and the 4 magnetic separation deironing of magnet separator again, gets into the vibration promotion with the sand grain and forges burning furnace 5 and carry out heat treatment, and the sand grain that obtains after the processing sends into cooler 6 and cools off.

As a further improvement, the system also comprises a grading sieve II 7, a hoisting machine I8, a hoisting machine II 10, an elevated coarse sand bin 9 and an elevated fine sand bin 11, the cooled reclaimed sand is graded by the grading sieve II to obtain coarse sand and fine sand, and the coarse sand and the fine sand are respectively conveyed to the elevated coarse sand bin and the elevated fine sand bin for storage by the hoisting machine I and the hoisting machine II.

As shown in fig. 2, the utility model discloses a forge burning furnace with vibration lifting, including frame 12, be provided with frame 15 in the frame, be provided with spring 14 between frame and the frame, be provided with vibrating motor on the frame, vibrating motor and spring combined action drive frame and upper portion connecting device, realize the vibration lifting function of law, are provided with the spiral track along vertical direction on the frame for the guide material is beated along the spiral track and is risen, and the vibration lifting function utilizes vibrating motor's asymmetric principle: when the two motors run reversely at the same time, a vibration couple is generated, and the materials are lifted to a certain height from the horizontal direction through the vibration of the damping spring. The vibration screw conveyor conveys materials upwards in an inclined conveying groove in a micro-throwing moving mode, compared with linear vibration conveying, the conveying path of the screw conveyor is not straight, but is spiral, and corresponding torsional vibration is generated around the central shaft of the spiral tower under a set gradient; thereby causing the load to move up the spiral.

The middle part of the track is provided with a tubular calcining furnace, the calcining furnace is sequentially provided with an outer shell layer 18, a heat insulation layer 19 and an electric heating layer 20 from outside to inside, the lower part of the vibration lifting calcining furnace is provided with a sand inlet 16, and the upper part of the vibration lifting calcining furnace is provided with a sand outlet 21.

The distance between the innermost side of the tubular calcining furnace and the spiral track 17 is kept between 10 mm to 15mm, so that the vibration of the elevator and the collision of the tubular calcining furnace are prevented, and the safety of the elevator is improved. The utility model discloses the working procedure as follows:

step S1: crushing the coated molding sand to be regenerated;

step S2: screening the crushed coated molding sand;

step S3: performing electromagnetic iron removal on the screened coated molding sand;

step S4: feeding the coated molding sand subjected to electromagnetic iron removal into a vibration elevator;

step S5: arranging a tubular calcining furnace at the lifting section, raising the temperature to 700-800 ℃, improving the contact between sand grains and air by using the vibration rise of the sand grains, and oxidizing or rubbing off a resin layer on the surfaces of the sand grains by using the mutual friction of the sand grains;

step S6: and cooling the sand grains to obtain reclaimed sand.

Step S7: and (4) feeding the reclaimed sand into a sieving machine, grading to obtain coarse sand and fine sand, and respectively feeding the coarse sand and the fine sand into different bins for storage.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a tectorial membrane molding sand regeneration system which characterized in that: the system comprises a lifting machine (1), a storage bin (2), a classifying screen I (3), a magnetic separator (4), a vibration lifting calcining furnace (5) and a cooler (6) which are connected in sequence, broken waste sand is sent into the storage bin (2) through the lifting machine (1), then is screened by the classifying screen I (3) and magnetically separated by the magnetic separator (4) for deironing, sand grains enter the vibration lifting calcining furnace (5) for heating treatment, and the sand grains obtained after treatment are sent into the cooler (6) for cooling.

2. The coated molding sand reclamation system as recited in claim 1, wherein: the system further comprises a classifying screen II (7), a hoisting machine I (8), a hoisting machine II (10), a high-position coarse sand bin (9) and a high-position fine sand bin (11), the cooled regenerated sand is classified by the classifying screen II to obtain coarse sand and fine sand, and the coarse sand and the fine sand are respectively sent into the high-position coarse sand bin and the high-position fine sand bin to be stored through the hoisting machine I and the hoisting machine II.

3. The coated molding sand reclamation system as recited in claim 1, wherein: the vibration lifting calcining furnace comprises a frame (12), a base (15) is arranged on the frame, a spring (14) is arranged between the frame and the base, and a vibration motor is arranged on the base to enable materials to jump upwards; the machine base is provided with a spiral track along the vertical direction and used for guiding materials to jump and rise along the spiral track, and the middle part of the track is provided with a tubular calcining furnace.

4. The coated molding sand reclamation system as recited in claim 3, wherein: the calcining furnace is sequentially provided with an outer shell layer (18), a heat insulation layer (19) and an electric heating layer (20) from outside to inside, the lower part of the vibration lifting calcining furnace is provided with a sand inlet (16), and the upper part of the vibration lifting calcining furnace is provided with a sand outlet (21).