CN111531124B

CN111531124B - Automatic control system and control method for sand mold three-dimensional printer

Info

Publication number: CN111531124B
Application number: CN202010557492.XA
Authority: CN
Inventors: 黄荣华; 林风; 祁伟; 王君衡; 周荣光
Original assignee: Guangdong Fenghua Zhuoli Technology Co ltd
Current assignee: Guangdong Fenghua Zhuoli Technology Co ltd
Priority date: 2020-06-18
Filing date: 2020-06-18
Publication date: 2021-06-29
Anticipated expiration: 2040-06-18
Also published as: CN111531124A

Abstract

The invention relates to an automatic control system of a sand mold three-dimensional printer and a control method thereof.A system automatically calculates the amount of required additives and curing agents by setting an intelligent feeding system and inputting the proportion of new sand and old sand, and controls each vacuum tank to respectively feed materials to a stirring pool according to the proportion, thereby realizing automatic and high-precision proportional batching and solving the problem that the quantitative batching of the new sand and the old sand can not be realized by the feeding system in the continuous production process of the sand mold three-dimensional printer; meanwhile, the intelligent feeding system is used for replacing manual feeding, so that labor force is liberated, labor cost is reduced, and proportioning precision and sand mould quality are improved; through setting up online clout recovery system, carry the clout to connect the hopper in through sending the sand pipe to for three-dimensional printing equipment recycles, realized the clout is automatic to be retrieved, solved because of the unable clout low in utilization ratio problem that causes of retrieving the clout.

Description

Automatic control system and control method for sand mold three-dimensional printer

Technical Field

The invention relates to the field of three-dimensional printing, in particular to an automatic control system and a control method for a sand mold three-dimensional printer.

Background

The existing sand mold three-dimensional printer has the advantages that the feeding system cannot realize automatic batching of new sand and old sand, batching can be performed only through manual work, and after the materials are sieved by manual work, the materials are uniformly mixed according to process requirements, so that the labor amount is large, the efficiency is low, and the continuity and the stability of batching quality are difficult to guarantee. In addition, the used sand and the residual sand generated during processing cannot be better recovered and supplied to the three-dimensional printing equipment for recycling, so that the waste of the residual sand is caused, and the utilization rate of the residual sand is reduced.

Disclosure of Invention

The invention aims to provide an automatic control system and a control method of a sand mold three-dimensional printer, which solve the problem that the sand mold three-dimensional printer cannot realize the proportioning of new sand and old sand by a feeding system in the continuous automatic production process by arranging an intelligent feeding system; through setting up online clout recovery system, solve the clout low-usage problem that the clout utilization ratio that produces and cause when unable cyclic utilization prints.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides an automatic control system of a sand mold three-dimensional printer, which comprises an intelligent feeding system, an online excess material recovery system, a three-dimensional printing system and an upper computer;

the intelligent feeding system, the three-dimensional printing system and the online excess material recovery system are communicated in pairs, and the intelligent feeding system is used for preparing sand materials according to the proportion of new sand and old sand and providing the sand materials for the three-dimensional printing system to be used for printing; the online excess material recovery system is used for recovering excess materials printed by the three-dimensional printing system and conveying the excess materials to the intelligent feeding system for recycling;

the upper computer is connected with the intelligent feeding system, the online excess material recovery system and the three-dimensional printing system respectively, and is used for issuing control instructions to the intelligent feeding system, the online excess material recovery system and the three-dimensional printing system to control the normal operation of each system.

The intelligent feeding system comprises a new sand vacuum tank, a used sand vacuum tank, an additive vacuum tank, a curing agent barrel, a stirring pool and a receiving hopper;

the feeding port of the new sand vacuum tank is communicated with the feeding air vent of the new sand warehouse, and the feeding port of the old sand vacuum tank is communicated with the feeding air vent of the old sand warehouse; a feeding port of the additive vacuum tank is communicated with an additive storage; the feeding ports of the new sand vacuum tank, the old sand vacuum tank, the additive vacuum tank and the curing agent barrel are connected with the stirring pool, the lower sand port of the stirring pool is connected with the receiving hopper, and a stirring pool feeding valve is arranged on a sand conveying pipeline between the lower sand port of the stirring pool and the receiving hopper;

a new sand material level detection switch for detecting whether new sand exists is arranged in the new sand warehouse; a used sand material level detection switch for detecting the presence or absence of used sand is installed in the used sand warehouse, and an additive material level detection switch for detecting the presence or absence of an additive is installed in the additive warehouse; a curing agent level detection switch for detecting whether a curing agent exists is arranged in the curing agent barrel;

the new sand vacuum tank is provided with a new sand weighing device, the used sand vacuum tank is provided with a used sand weighing device, and the additive vacuum tank is provided with an additive weighing device;

a new sand blanking valve is arranged on a sand conveying pipeline between a blanking port of the new sand vacuum tank and the stirring pool, a used sand blanking valve is arranged on a sand conveying pipeline between a blanking port of the used sand vacuum tank and the stirring pool, and an additive blanking valve is arranged on a pipeline between a blanking port of the additive vacuum tank and the stirring pool; a quantitative pump is arranged on a pipeline between the feed opening of the curing agent barrel and the stirring pool;

connect the hopper to be used for temporarily receiving the sand material of misce bene and the surplus sand of retrieving, connect the hopper to install and be used for detecting the hopper material level detection switch that connects that has or not sand material, connect the material loading blow vent of hopper through send sand pipeline with three-dimensional printing system's host computer jar intercommunication.

The online excess material recovery system comprises an excess sand vacuum tank, an excess sand hopper, a sand guide hopper, a driving wheel, a driven wheel, a belt supporting wheel, a sand conveying belt and a driving motor;

a feeding port of the residual sand vacuum tank is communicated with the residual sand hopper through a sand conveying pipeline, and a discharging port of the residual sand vacuum tank is communicated with a receiving hopper of the intelligent feeding system through a sand conveying pipeline; a residual sand discharging valve is arranged on a sand conveying pipeline between a discharging port of the residual sand vacuum tank and the receiving hopper;

the sand conveying belt is arranged between the driving wheel and the driven wheel, a plurality of belt supporting wheels are arranged in the sand conveying belt at intervals, and the belt supporting wheels, the driving wheel and the driven wheel are positioned on the same horizontal plane;

the tail end of the advancing direction of the sand conveying belt is connected with the sand guide hopper, the residual sand hopper is arranged right below the sand guide hopper, and the sand guide hopper is used for guiding residual sand on the sand conveying belt into the residual sand hopper; and a residual sand material level detection switch for detecting whether residual sand exists is arranged in the residual sand hopper.

The three-dimensional printing system comprises three-dimensional printing equipment, a host tank, a sand storage hopper, a sand cleaning vacuum tank and a sand box;

a feeding port of the host tank is communicated with a receiving hopper of the intelligent feeding system, a feed opening of the host tank is communicated with a sand storage hopper of the three-dimensional printing equipment, a sand conveying pipeline between the feed opening of the host tank and the sand storage hopper is provided with a host tank feeding valve, and the host tank is used for receiving sand materials which are uniformly mixed in the receiving hopper;

a sand storage material level detection switch for detecting whether a sand storage material exists or not is arranged in the sand storage hopper;

the sand box is arranged right below the sand storage hopper and used for bonding and storing sand molds when the three-dimensional printing equipment prints the sand molds;

the sand box is communicated with a feeding port of the sand cleaning vacuum tank, and the sand cleaning vacuum tank is used for storing old sand to be cleaned; the feed opening of the sand removal vacuum tank is communicated with the used sand warehouse, and a sand removal feed valve is arranged between the feed opening of the sand removal vacuum tank and the used sand warehouse.

The fresh sand weighing device, the used sand weighing device and the additive weighing device are all composed of a plurality of weighing sensors, a plurality of fixing lugs and a frame, the fixing lugs are uniformly arranged at the bottom of the outer side of the vacuum tank body, the weighing sensors are uniformly arranged on a fixing plate surface of the frame, the weighing sensors and the frame form a whole, and the weighing sensors are in contact with the fixing lugs;

the new sand weighing device converts the output analog quantity into a readable digital quantity, the actual weight of the new sand is obtained through conversion, and the quantity of the needed curing agent and the additive is calculated according to the actual weight and the mixing proportion of the new sand;

the required amounts of the curing agent and the additive are calculated according to the actual weight and the mixing ratio of the fresh sand, and comprise the following steps:

the amount of solidified agent is x% of the actual weight of the fresh sand and the amount of single drop of the dosing pump;

the amount of additive is the actual weight of fresh sand;

wherein x% is the mixing proportion of the curing agent, and y% is the mixing proportion of the additive;

optionally, at least three weighing sensors are arranged in the new sand weighing device, the used sand weighing device and the additive weighing device, and at least three fixing lugs are arranged;

a lifting bottom plate is arranged in the sand box and used for loading sand materials and lifting;

the top of the sand box is also provided with a sand scraping mechanism, and the sand scraping mechanism is used for scraping residual sand after sand spreading of the three-dimensional printing equipment on the lifting bottom plate onto a sand conveying belt;

the scraping mechanism comprises a scraper and a scraping hopper, the scraper is positioned right above the lifting bottom plate and is used for collecting the residual sand on the lifting bottom plate and scraping the residual sand onto the sand conveying belt, and the scraping hopper is used for temporarily storing the residual sand collected by the scraper;

the sand conveying belt is adjacent to the sand box, the sand conveying belt and the top of the sand box keep the same horizontal plane, and all residual sand is scraped onto the sand conveying belt by the scraper.

The new sand vacuum tank, the used sand vacuum tank and the additive vacuum tank in the intelligent feeding system, the residual sand vacuum tank in the online residual sand recovery system, and the sand cleaning vacuum tank and the host tank in the three-dimensional printing system respectively comprise a vacuum tank body and a vacuum sand suction mechanism;

the vacuum sand suction mechanism comprises a sand suction interface, a sand feeding interface, a vacuum pneumatic conveying pipe interface, a back blowing pneumatic pipe interface, a tank opening cover fixing valve and a blanking guide pipe; the tank opening of the vacuum tank body is provided with a tank opening cover, and the vacuum tank body and the tank opening cover are detachably connected through a plurality of tank opening cover fixed valves; the tank opening cover is provided with the sand suction interface, and the sand suction interface is connected with a sand outlet of the sand conveying pipeline; the sand outlet of the vacuum tank body is connected with the sand feeding interface, and the sand feeding interface is connected with the blanking guide pipe through each blanking valve;

a drum is further inserted into the tank opening cover, the part of the drum inserted into the tank opening cover is a filter screen, the part of the drum not inserted into the tank opening cover is provided with a back-blowing pneumatic pipe connector and a vacuum pneumatic conveying pipe connector, the vacuum pneumatic conveying pipe connector is connected with an air inlet of a fan, the fan is used for extracting air in the vacuum tank body, a back-blowing pneumatic valve is mounted on the back-blowing pneumatic pipe connector, and the back-blowing pneumatic valve utilizes the air pressure difference between the inside and the outside of the vacuum tank body to feed air into the vacuum tank body so as to back-blow the filter screen;

when jar flap standing valve the blowback pneumatic valve and each when the baiting valve all is in the closed condition, the filter screen normally filters, inhale the sand interface and pass through send sand pipe connection to corresponding sand storehouse in, through the fan lasts the work of bleeding, lasts the extraction the internal air of vacuum tank inhale the sand interface and produce lasting suction, send sand pipe to absorb sand material from the sand storehouse extremely in the vacuum tank, when lasting material suction time reachs the preset time, the fan stops the work of bleeding, stops to inhale the material.

The invention also provides a control method of the sand mold three-dimensional printer, which comprises the following specific steps:

s1: starting an automatic control system of the sand mold three-dimensional printer;

s2: the method comprises the steps that an upper computer obtains a ratio of new sand to used sand input on a display screen, sends the ratio and a feeding instruction to an intelligent feeding system, controls the intelligent feeding system to allocate sand materials according to the ratio of the new sand to the used sand, mixes and stirs the sand materials, and then provides the uniformly mixed sand materials for a three-dimensional printing system to be printed and used;

s3: the three-dimensional printing system receives the sand material conveyed by the intelligent feeding system and the printing instruction sent by the upper computer, and performs three-dimensional printing;

s4: and the online excess material recovery system recovers and prints unused excess materials and conveys the excess materials to the intelligent feeding system for recycling.

The intelligent feeding system allocates sand materials according to the proportion of new sand and old sand, and provides the sand materials for the three-dimensional printing system to print and use, and the intelligent feeding system specifically comprises:

s21: intelligence feeding system utilizes the vacuum sand suction machine to construct the material loading, and is specific:

closing a new sand vacuum tank, a used sand vacuum tank and a tank opening cover fixed valve, a back-blowing pneumatic valve and a blanking valve of an additive vacuum tank, normally filtering a filter screen, opening a fan to continuously exhaust air, continuously extracting air in the new sand vacuum tank, the used sand vacuum tank and the vacuum tank body in the additive vacuum tank, and generating continuous suction at a sand suction interface, wherein the suction forces a sand conveying pipeline to respectively suck new sand, used sand and additives from a new sand warehouse, a used sand warehouse and an additive warehouse and correspondingly add the new sand, the used sand and the additives into the vacuum tank bodies of the new sand vacuum tank, the used sand vacuum tank and the additive vacuum tank; when the continuous material suction time reaches the preset time, stopping air suction operation of the fan and stopping material suction;

s22: the new sand weighing device, the used sand weighing device and the additive weighing device respectively weigh corresponding vacuum tanks, then the new sand weighing device converts output analog quantity into readable digital quantity, the actual weight of the new sand is obtained through conversion, and the amount of the needed curing agent and the additive is calculated according to the actual weight and the mixing ratio of the new sand;

the amount of additive is the actual weight of fresh sand;

s23: opening a new sand discharging valve, a used sand discharging valve and an additive discharging valve, and discharging the new sand vacuum tank, the used sand vacuum tank and the additive vacuum tank into the stirring pool by using a vacuum sand sucking mechanism according to the new sand weighing device, the used sand weighing device and the additive weighing device and the calculated casting amount of the new sand, the used sand and the additive; meanwhile, a quantitative pump is started, and the curing agent in the curing agent barrel is quantitatively pumped into the stirring pool;

s24: starting a stirrer, and uniformly mixing and stirring the new sand, the old sand, the additive and the curing agent in the stirring tank by the stirrer;

s25: opening a blanking valve of the stirring tank, conveying the uniformly mixed sand material to a receiving hopper through a sand conveying pipeline, opening a feeding vent of the receiving hopper after a material level detection switch of the receiving hopper detects the sand material, and conveying the uniformly mixed sand material to a host tank of the three-dimensional printing system through the sand conveying pipeline for printing of the three-dimensional printing system;

the three-dimensional printing system receives the sand material that intelligence feeding system carried, and the print order that the host computer was issued carries out three-dimensional printing, specifically includes:

s31: opening a blanking valve of a host tank, conveying sand materials to a sand storage hopper of the three-dimensional printing equipment through a sand conveying pipeline, and performing three-dimensional printing after a sand storage material level detection switch of the three-dimensional printing equipment detects the stored sand materials;

s32: when the three-dimensional printing equipment prints the sand mold, the sand mold is bonded and stored in the sand box, the sand cleaning vacuum tank extracts and stores used sand in the sand box by using the vacuum sand sucking mechanism, sand cleaning is carried out through a filter screen in the sand cleaning vacuum tank, then a sand cleaning discharging valve is opened, and the sand cleaned used sand is conveyed to a used sand warehouse of the intelligent feeding system through a sand conveying pipeline;

s33: the residual sand is lifted to the top of the sand box by a lifting bottom plate in the sand box, and the residual sand on the lifting bottom plate is scraped onto a sand conveying belt on one side of the sand box by a scraper;

on-line clout recovery system retrieves the clout of printing unused to carry the clout to intelligent feeding system recycles, specifically includes:

s41: turning on a driving motor, and conveying the residual sand on the sand conveying belt to a residual sand hopper under the transmission of a driving wheel, a driven wheel and a belt supporting wheel and the flow guide action of the sand guide hopper;

s42: when the residual sand level detection switch detects that residual sand exists in the residual sand hopper, a residual sand vacuum tank communicated with the residual sand hopper extracts the residual sand in the residual sand hopper by using a vacuum sand sucking mechanism;

s43: and opening a residual sand discharging valve on the residual sand vacuum tank, and conveying residual sand to a receiving hopper in the intelligent feeding system through a sand conveying pipeline for recycling.

The invention discloses the following technical effects:

1. through setting up intelligent feeding system, input the ratio proportion of new sand and used sand, then the system calculates the volume of required additive and curing agent automatically to carry out the material loading stirring automatically, realized automatic, the batching of high accuracy, material loading, solved sand mould three-dimensional inkjet printer in continuous automated production process, can't realize new, the used sand problem of deciding the proportion batching through material loading system. Meanwhile, the method of replacing manual feeding by the intelligent feeding system is adopted, so that labor force is liberated, labor cost is reduced, proportioning precision is effectively improved, and sand mold quality is improved.

2. Through setting up online clout recovery system, the clout sand that produces when making the printing is carried to receiving the hopper through sending the sand pipeline to supply three-dimensional printing equipment to recycle, realized the automatic recovery of clout, reduced manufacturing cost, solved the clout low-usage problem because of can't retrieve the clout and cause.

3. Through setting up the vacuum sand suction mechanism, only rely on the suction of fan, just for inhaling sand, send sand to provide power, make sand material flow in the pipeline, for material loading and clout recovery lay the basis, through setting up a fan on the vacuum sand suction mechanism, can reach above-mentioned purpose, reduced manufacturing cost, improved production efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is an overall construction diagram of an automatic control system of a sand mold three-dimensional printer;

FIG. 2 is a schematic diagram of a specific structure of an automatic control system of a sand mold three-dimensional printer;

FIG. 3 is a schematic diagram of the structure of an on-line residue recovery system;

FIG. 4 is a front view of the structure of the weighing device and the vacuum sand suction mechanism;

FIG. 5 is a left side view of the structure of the weighing device and the vacuum sand suction mechanism;

FIG. 6 is a top view of the structure of the weighing device and the vacuum sand suction mechanism;

fig. 7 is a control flowchart of the sand three-dimensional printer.

Description of reference numerals:

1-new sand vacuum tank, 2-old sand vacuum tank, 3-additive vacuum tank, 4-curing agent barrel, 5-stirring tank, 501-stirring tank blanking valve, 6-receiving hopper, 7-new sand warehouse, 8-old sand warehouse, 9-additive warehouse, 10-new sand level detection switch, 11-old sand level detection switch, 12-additive level detection switch, 13-curing agent level detection switch, 14-feeding vent, 15-new sand weighing device, 16-old sand weighing device, 17-additive weighing device, 18-new sand blanking valve, 19-old sand blanking valve, 20-additive blanking valve, 21-proportioning pump, 22-receiving hopper level detection switch, 23-host tank, 24-remaining sand vacuum tank, 25-a residual sand hopper, 26-a sand guide hopper, 27-a driving wheel, 28-a driven wheel, 29-a belt riding wheel, 30-a sand conveying belt, 31-a driving motor, 32-a residual sand discharging valve, 33-a residual sand level detection switch, 34-a sand storage hopper, 35-a sand cleaning vacuum tank, 36-a sand box, 37-a main machine tank discharging valve, 38-a sand storage hopper level detection switch, 39-a sand cleaning discharging valve, 40-a weighing sensor, 41-a fixing lug, 42-a rack, 43-a lifting bottom plate, 44-a sand scraping mechanism, 441-a scraper, 442-a sand scraping hopper, 45-a vacuum tank body, 46-a vacuum sand suction mechanism, 461-a sand suction interface, 462-a sand conveying interface, 463-a vacuum pneumatic conveying pipe interface, 464-a back-blowing pneumatic pipe interface, 465-tank opening cover fixing valve, 466-blowback pneumatic valve, 467-blanking guide pipe and 468-filter screen.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

As shown in fig. 1, this embodiment shows an automatic control system of a sand mold three-dimensional printer, which includes an intelligent feeding system, an online excess material recycling system, a three-dimensional printing system and an upper computer.

The intelligent feeding system, the three-dimensional printing system and the online excess material recovery system are communicated in pairs, and the intelligent feeding system is used for preparing sand materials according to the proportion of new sand and old sand and providing the sand materials for the three-dimensional printing system to be used for printing; and the online excess material recovery system is used for recovering the excess material printed by the three-dimensional printing system and conveying the excess material to the intelligent feeding system for recycling.

Fig. 2 shows specific configurations and connection relationships of the intelligent feeding system, the online residue recycling system, and the three-dimensional printing system.

The intelligent feeding system comprises a new sand vacuum tank 1, an old sand vacuum tank 2, an additive vacuum tank 3, a curing agent barrel 4, a stirring pool 5 and a receiving hopper 6.

The feeding port of the new sand vacuum tank 1 is communicated with the feeding air port 14 of the new sand warehouse 7, and the feeding port of the used sand vacuum tank 2 is communicated with the feeding air port 14 of the used sand warehouse 8; a feeding port of the additive vacuum tank 3 is communicated with an additive storage 9; and the feed openings of the new sand vacuum tank 1, the old sand vacuum tank 2, the additive vacuum tank 3 and the curing agent barrel 4 are connected with the stirring pool 5. The stirring pool 5 is internally provided with a stirrer, the stirrer is used for uniformly stirring new sand, old sand, additives and curing agents in the stirring pool 5, and a lower sand opening of the stirring pool 5 is connected with the material receiving hopper 6.

A new sand material level detection switch 10 for detecting whether new sand exists is arranged in the new sand warehouse 7; a used sand material level detection switch 11 for detecting the presence or absence of used sand is installed in the used sand warehouse 8, and an additive material level detection switch 12 for detecting the presence or absence of an additive is installed in the additive warehouse 9; and a curing agent level detection switch 13 for detecting whether a curing agent exists is arranged in the curing agent barrel 4.

The new sand vacuum tank 1 is provided with a new sand weighing device 15, the used sand vacuum tank 2 is provided with a used sand weighing device 16, and the additive vacuum tank 3 is provided with an additive weighing device 17.

The feed opening of new sand vacuum tank 1 with be provided with new sand unloading valve 18 on the sand conveying pipeline between the stirring pond 5, the feed opening of used sand vacuum tank 2 with be provided with used sand unloading valve 19 on the sand conveying pipeline between the stirring pond 5, the feed opening of additive vacuum tank 3 with be provided with additive unloading valve 20 on the pipeline between the stirring pond 5, the lower sand mouth of stirring pond 5 with connect and be provided with stirring pond unloading valve 501 on the sand conveying pipeline between hopper 6, the feed opening of curing agent bucket 4 with be provided with constant delivery pump 21 on the pipeline between the stirring pond 5, constant delivery pump 21 is used for the quantitative extraction curing agent in the curing agent bucket 4 extremely in the stirring pond 5.

Connect hopper 6 to be used for temporarily receiving the sand material of misce bene and the surplus sand of retrieving, connect hopper 6 to install and be used for detecting the hopper material level detection switch 22 that connects that has or not sand material, connect the material loading blow vent 14 of hopper 6 through send sand pipeline with three-dimensional printing system's host computer jar 23 intercommunication.

The upper computer is provided with a display screen and used for inputting the proportion of new sand and old sand by a user, the upper computer sends the proportion and the feeding instruction to the intelligent feeding system, the intelligent feeding system is controlled to allocate sand materials according to the proportion of the new sand and the old sand and mix and stir the sand materials, and then the sand materials which are mixed uniformly are provided for the three-dimensional printing system to be printed and used.

Through setting up intelligent feeding system, realized automatic, batching and the material loading of high accuracy, solved sand mould three-dimensional inkjet printer in continuous automated production process, can't realize new, the problem of old sand ration batching through the material loading system. Moreover, the method of replacing manual feeding by the intelligent feeding system is adopted, so that the labor force is liberated, the labor cost is reduced, the proportioning precision is effectively improved, and the sand mold quality is further improved.

Fig. 3 shows the structure of the on-line residue recycling system of the present embodiment. The online excess material recovery system comprises an excess sand vacuum tank 24, an excess sand hopper 25, a sand guide hopper 26, a driving wheel 27, a driven wheel 28, a belt supporting wheel 29, a sand conveying belt 30 and a driving motor 31.

Wherein, the feeding port of the residual sand vacuum tank 24 is communicated with the residual sand hopper 25 through a sand feeding pipeline, and the discharging port of the residual sand vacuum tank 24 is communicated with the receiving hopper 6 of the intelligent feeding system through a sand feeding pipeline; a residual sand discharging valve 32 is arranged on a sand conveying pipeline between a discharging opening of the residual sand vacuum tank 24 and the receiving hopper 6; the sand conveying belt 30 is arranged between the driving wheel 27 and the driven wheel 28, a plurality of belt supporting wheels 29 are arranged in the sand conveying belt 30 at intervals, and the belt supporting wheels 29, the driving wheel 27 and the driven wheel 28 are positioned on the same horizontal plane; the tail end of the sand conveying belt 30 in the advancing direction is connected with the sand guide hopper 26, the residual sand hopper 25 is arranged right below the sand guide hopper 26, and the sand guide hopper 26 is used for guiding residual sand on the sand conveying belt 30 into the residual sand hopper 25; a residual sand level detection switch 33 for detecting whether residual sand exists is arranged in the residual sand hopper 25;

the three-dimensional printing system comprises a three-dimensional printing device, a host tank 23, a sand storage hopper 34, a sand cleaning vacuum tank 35 and a sand box 36. The material inlet of the host tank 23 is communicated with the material receiving hopper 6 of the intelligent material loading system, the material outlet of the host tank 23 is communicated with the sand storage hopper 34 of the three-dimensional printing equipment, a host tank material discharging valve 37 is arranged on a sand conveying pipeline between the material outlet of the host tank 23 and the sand storage hopper 34, and the host tank 23 is used for receiving sand materials which are uniformly mixed in the material receiving hopper 6.

A sand storage hopper material level detection switch 38 for detecting whether a sand storage hopper exists or not is arranged in the sand storage hopper 34; the sand box 36 is arranged right below the sand storage hopper 34, and the sand box 36 is used for bonding and storing sand molds when the three-dimensional printing equipment prints the sand molds; the sand box 36 is communicated with a feeding port of the sand cleaning vacuum tank 35, and the sand cleaning vacuum tank 35 is used for storing old sand to be cleaned; the feed opening of the sand cleaning vacuum tank 35 is communicated with the used sand warehouse 8, and a sand cleaning feed valve 39 is arranged between the feed opening of the sand cleaning vacuum tank 35 and the used sand warehouse 8.

A lifting bottom plate 43 is arranged in the sand box 36, and the lifting bottom plate 43 is used for loading sand and lifting. The top of the sand box 36 is further provided with a scraping mechanism 44, and the scraping mechanism 44 is used for scraping off residual sand after the three-dimensional printing device on the lifting bottom plate 43 is spread with sand onto the sand conveying belt 30.

The scraping mechanism 44 includes a scraper 441 and a scraping hopper 442, the scraper 441 is located right above the lifting bottom plate 43, the scraper 441 is used for collecting the residual sand on the lifting bottom plate 43 and scraping the residual sand onto the sand conveying belt 30, and the scraping hopper 442 is used for temporarily storing the residual sand collected by the scraper 441.

The sand conveying belt 30 is arranged adjacent to the sand box 36, and the sand conveying belt 30 and the top of the sand box 36 keep the same horizontal plane, so that the scraper 441 can scrape all the residual sand onto the sand conveying belt 30.

Through setting up online clout recovery system, the clout sand that produces when making the printing is through sending the sand pipe to carry to connect hopper 6 in to supply three-dimensional printing equipment to recycle, realized "printing while retrieving", promptly when carrying out three-dimensional printing, the clout also is retrieving automatically, thereby has solved because of the low problem of clout utilization ratio that can't retrieve the clout and cause, has reduced manufacturing cost.

Fig. 4 to 6 are three views of the structures of the weighing device and the vacuum sand suction mechanism, respectively. The new sand weighing device 15, the used sand weighing device 16 and the additive weighing device 17 are composed of a plurality of weighing sensors 40, a plurality of fixing lugs 41 and a frame 42, the fixing lugs 41 are uniformly arranged at the bottom of the outer side of the vacuum tank body 45, the weighing sensors 40 are uniformly arranged on the fixing plate surface of the frame 42, the weighing sensors 40 and the frame 42 form a whole, and the weighing sensors 40 are in contact with the fixing lugs 41.

The new sand weighing device 15 converts the output analog quantity into a readable digital quantity, the actual weight of the new sand is obtained through conversion, and the quantity of the needed curing agent and the additive is calculated according to the actual weight and the mixing proportion of the new sand.

the amount of solidified agent ═ actual weight of fresh sand x% amount of single drop of dosing pump 21;

the amount of additive is the actual weight of fresh sand;

wherein x% is the mixing ratio of the curing agent, and y% is the mixing ratio of the additive.

The weighing sensors 40 in the new sand weighing device 15, the used sand weighing device 16 and the additive weighing device 17 are at least three, and the fixing lugs 41 are also at least three. The weighing sensors 40 are arranged in pairs with the fixing lugs 41 in one-to-one contact.

In the above weighing apparatus, the frame 42 is a main supporting force-receiving mechanism, and the bottom of the weighing sensor 40 is fixed on the frame 42, and the top of the weighing sensor 40 contacts with the fixing lug 41 of the vacuum tank, so as to realize mechanical isolation of the new sand vacuum tank 1, the used sand vacuum tank 2 and the additive vacuum tank 3, and the vacuum tank is suspended under the support of the weighing sensor 40, thereby realizing weighing of sand inside the vacuum tank, and facilitating more accurate batching.

New sand vacuum tank 1, used sand vacuum tank 2 and additive vacuum tank 3 in the intelligence feeding system, surplus sand vacuum tank 24 in the online surplus sand recovery system, and sand removal vacuum tank 35 and host computer jar 23 in the three-dimensional printing system all include vacuum tank 45 and vacuum sand suction mechanism 46.

The vacuum sand suction mechanism 46 comprises a sand suction interface 461, a sand feeding interface 462, a vacuum pneumatic conveying pipe interface 463, a back blowing pneumatic pipe interface 464, a tank cover fixing valve 465 and a blanking guide pipe 467. Wherein, the tank mouth of the vacuum tank 45 is provided with a tank mouth cover, and the vacuum tank 45 and the tank mouth cover are detachably connected through a plurality of tank mouth cover fixing valves 465; work as the tank port lid with vacuum tank 45 laminating back, close a plurality of tank port lid fixed valve 465, this moment the tank port of vacuum tank 45 is in encapsulated situation, opens tank port lid fixed valve 465 can open the tank port lid to inside inspection, the maintenance of vacuum tank 45 to and the inside filter screen 468 of clearance.

The tank opening cover is provided with the sand suction interface 461, and the sand suction interface 461 is connected with a sand outlet of the sand conveying pipeline; the sand outlet of the vacuum tank 45 is connected to the sand feeding port 462, and the sand feeding port 462 is connected to the blanking guide pipe 467 through the blanking valves (here, the blanking valves include the new sand blanking valve 18, the used sand blanking valve 19, the additive blanking valve 20, the residual sand blanking valve 32, the main tank blanking valve 37 and the sand cleaning blanking valve 39). The blanking guide pipe 467 is a guide tubular structure capable of rotating 360 degrees, and the blanking guide pipe 467 is rotated to a certain direction, so that sand in the vacuum tank body 45 can be emptied into a corresponding container according to the specified direction.

A drum is also inserted into the tank port cover, the part of the drum inserted into the tank port cover is a filter screen 468, the part of the drum not inserted into the tank port cover is provided with the blowback air pipe interface 464 and the vacuum air conveying pipe interface 463, the blowback air pipe interface 464 is provided with a blowback air valve 466, the vacuum air conveying pipe interface 463 is connected with an air inlet of a fan, and air in the vacuum tank body 45 is exhausted in a vacuumizing mode through the suction force of the fan;

closing other valves, and only enabling the blowback pneumatic valve 466 to be in an open state, wherein at the moment, the blowback pneumatic pipe interface 464 utilizes pneumatic force of air pressure to fill air into the vacuum tank 45 at a certain frequency, and blowback the filter screen 468, so that larger sand particles attached to the filter screen 468 fall off, and the filter screen 468 is continuously kept in a normal filtering state.

When the tank cover fixing valve 465, the blowback pneumatic valve 466 and each blanking valve are all in a closed state, the filter screen 468 is normally used for filtering, the sand suction port 461 is connected into a corresponding sand warehouse through a sand conveying pipeline, air in the vacuum tank body 45 is continuously sucked through the continuous air suction work of the fan, continuous suction force is generated at the sand suction port 461, the sand conveying pipeline sucks sand materials from the sand warehouse into the vacuum tank body 45, and when the continuous suction time reaches preset time, the fan stops air suction work and stops sucking materials.

Through setting up vacuum sand suction mechanism 46, only rely on the suction of fan, just for inhaling sand, send sand to provide power, make sand material flow in the pipeline, for material loading and clout recovery lay the basis, inhale sand mechanism 46's special construction and fan through the vacuum, can reach above-mentioned effect to manufacturing cost has been reduced, has improved production efficiency.

Example 2

Fig. 7 is a control flowchart of the sand three-dimensional printer. The embodiment provides a control method of a sand mold three-dimensional printer, which comprises the following specific steps:

s1: starting an intelligent feeding system, an online excess material recovery system, a three-dimensional printing system and an upper computer in an automatic control system of the sand mold three-dimensional printer;

s2: the upper computer obtains the proportion of the new sand and the old sand input on the display screen, sends the proportion and the feeding instruction to the intelligent feeding system, controls the intelligent feeding system to allocate and mix the sand materials according to the proportion of the new sand and the old sand, and then provides the uniformly mixed sand materials for the three-dimensional printing system to be printed for use;

s21: the intelligent feeding system utilizes 46 vacuum sand suction mechanisms for feeding, and is specific:

closing a new sand vacuum tank 1, a used sand vacuum tank 2 and a tank opening cover fixed valve 465, a back-blowing pneumatic valve 466 and a blanking valve of an additive vacuum tank 3, normally filtering by a filter screen 468, opening a fan to continuously exhaust air, continuously extracting air in the vacuum tank bodies of the new sand vacuum tank 1, the used sand vacuum tank 2 and the additive vacuum tank 3, and generating continuous suction at a sand suction interface 461, wherein the suction forces cause a sand conveying pipeline to respectively suck new sand, used sand and additives from a new sand warehouse 7, a used sand warehouse 8 and an additive warehouse 9 and correspondingly add the new sand, the used sand and the additives into the vacuum tank bodies 45 of the new sand vacuum tank 1, the used sand vacuum tank 2 and the additive vacuum tank 3; when the continuous material suction time reaches the preset time, stopping air suction operation of the fan and stopping material suction;

s22: the new sand weighing device 15, the used sand weighing device 16 and the additive weighing device 17 respectively weigh corresponding vacuum tanks, then the new sand weighing device 15 converts output analog quantity into readable digital quantity, the actual weight of the new sand is obtained through conversion, and the amount of the needed curing agent and the additive is calculated according to the actual weight and the mixing proportion of the new sand;

the amount of additive is the actual weight of fresh sand;

s23: opening a new sand discharging valve 18, a used sand discharging valve 19 and an additive discharging valve 20, and discharging the new sand vacuum tank 1, the used sand vacuum tank 2 and the additive vacuum tank 3 into the stirring pool 5 by using a vacuum sand sucking mechanism 46 according to the calculated new sand, used sand and additive feeding amount weighed by the new sand weighing device 15, the used sand weighing device 16 and the additive weighing device 17; meanwhile, the quantitative pump 21 is started to quantitatively pump the curing agent in the curing agent barrel 4 into the stirring pool 5;

s24: starting a stirrer, and uniformly mixing and stirring the new sand, the old sand, the additive and the curing agent in the stirring tank 5 by the stirrer;

s25: the stirring tank blanking valve 501 is opened, the uniformly mixed sand material is conveyed to the receiving hopper 6 through the sand conveying pipeline, after the receiving hopper material level detection switch 22 detects the sand material, the feeding vent 14 of the receiving hopper 6 is opened, and the uniformly mixed sand material is conveyed to the host tank 23 of the three-dimensional printing system through the sand conveying pipeline for printing of the three-dimensional printing system.

s31: opening a host tank blanking valve 37, conveying sand materials to a sand storage hopper 34 of the three-dimensional printing equipment through a sand conveying pipeline, and performing three-dimensional printing after a sand storage hopper material level detection switch 38 of the three-dimensional printing equipment detects the stored sand materials;

s32: when the three-dimensional printing equipment prints the sand mold, the sand mold is bonded and stored in the sand box 36, the sand cleaning vacuum tank 35 extracts and stores used sand in the sand box 36 by using the vacuum sand sucking mechanism 46, the sand is cleaned through the filter screen 468 in the sand cleaning vacuum tank 35, then the sand cleaning discharging valve 39 is opened, and the cleaned used sand is conveyed to the used sand warehouse 8 of the intelligent feeding system through a sand conveying pipeline;

s33: the lifting bottom plate 43 in the sand box 36 lifts the residual sand to the top of the sand box 36, and the scraper 441 scrapes the residual sand on the lifting bottom plate 43 onto the sand conveying belt 30 on one side of the sand box 36.

s41: the driving motor 31 is started, and under the transmission of the driving wheel 27, the driven wheel 28 and the belt supporting wheel 29 and the flow guiding effect of the sand guiding hopper 26, the residual sand on the sand conveying belt 30 is conveyed into the residual sand hopper 25;

s42: when the residual sand level detection switch 33 detects that residual sand exists in the residual sand hopper 25, the residual sand vacuum tank 24 communicated with the residual sand hopper 25 extracts the residual sand in the residual sand hopper 25 by using the vacuum sand sucking mechanism 46;

s43: and opening a residual sand discharging valve 32 on the residual sand vacuum tank 24, and conveying residual sand to a receiving hopper 6 in the intelligent feeding system through a sand conveying pipeline for recycling.

The working principle of the invention is as follows:

according to the invention, by combining a detection technology, a digital quantity remote communication control technology and an automatic control technology, the output analog quantity of a weighing device is converted into a digital quantity which can be read by a PLC (programmable logic controller) through a new sand weighing device 15, and the actual weight of sand is obtained through conversion; meanwhile, the following results are obtained through calculation: the method comprises the steps of automatically supplying a three-dimensional printing device with a solidifying agent amount which is the actual weight of new sand x% of a single drop amount of a dosing pump 21, and an additive amount which is the actual weight of new sand y% (wherein x% is the mixing proportion of the solidifying agent, and y% is the mixing proportion of the additive), uniformly mixing the new sand, the old sand, the additive and the solidifying agent, and residual sand recovered by an online residual sand recovery system, thereby realizing intelligent feeding and online residual material recovery of the sand mold (core) three-dimensional printing device.

The working principle of the weighing device is as follows:

a plurality of weighing sensors 40 are respectively and uniformly installed on a fixed plate surface of a rack 42, the weighing sensors 40 and the rack 42 are connected into a whole, fixing lugs 41 of vacuum tanks (namely a new sand vacuum tank 1, a used sand vacuum tank 2, an additive vacuum tank 3, a residual sand vacuum tank 24, a host tank 23 and a sand cleaning vacuum tank 35) are respectively installed on the weighing sensors 40, and the weighing sensors 40 support the vacuum tanks through mechanical isolation so as to suspend the vacuum tanks in the air. Under the condition of power-on, the zero calibration weighing device enables the weighing sensor 40 module to output zero analog quantity, simultaneously the analog quantity is converted into digital quantity readable by the PLC and is calibrated to be zero, namely the weight of the vacuum tank is calibrated to be zero, and the weight of the sand is determined according to the output magnitude of the digital quantity on the basis of the zero calibration weighing device.

The working principle of the vacuum sand suction mechanism of the invention is as follows:

when the tank opening cover fixing valve 465, the blowback pneumatic valve 466 and the blanking valve of each vacuum tank are all in a closed state, the filter screen 468 is in a good state, the sand suction interface 461 is connected to a corresponding sand reservoir through a sand conveying pipeline, the fan continuously pumps air, the air in the vacuum tank body 45 is continuously pumped outwards, continuous suction is generated at the sand suction interface 461, the sand conveying pipeline sucks sand from the sand reservoir into the vacuum tank body 45, and when the continuous suction time reaches the preset time, the fan stops pumping air and stops sucking the material.

The automatic execution logic program general flow after the automatic control system of the sand mold three-dimensional printer is started comprises the following steps: the system comprises an intelligent feeding system work flow, a three-dimensional printing system work flow and an online excess material recovery system work flow.

Wherein, intelligence feeding system working method includes:

1: mode 1 (new sand + curing agent);

2: mode 2 (used sand + curing agent);

3: mode 3 (new sand + used sand + curing agent);

4: mode 4 (new sand + curing agent + additive);

5: mode 5 (used sand + curing agent + additive);

6: mode 6 (new sand + used sand + curing agent + additive).

The following describes a working mode of mode 6 (new sand, used sand, curing agent and additive) of the intelligent feeding system, and several working modes 1 to 5 are similar to the working flow of mode 6 and can be obtained by self-combination according to different types of added materials.

The mode 6 workflow is divided into the following stages: the method comprises the working process of extracting new/used sand, the working process of extracting new/used sand from a vacuum tank 2 with material and discharging sand, the working process of feeding additive, the working process of discharging additive with material, the working process of stirring, the working process of discharging sand after stirring and the working process of receiving sand from a receiving hopper 6.

And (3) new sand extraction/old sand extraction work flow:

when the intelligent feeding system starting button is changed from '0' (low level) to '1' (high level), the intelligent feeding system is changed from the stop state to the automatic operation sand mixing mode. When the curing agent material level detection switch 13 is at a low level of '0', the curing agent barrel 4 is short of material, the intelligent feeding system is suspended, and the display screen of the upper computer prompts 'the curing agent barrel 4 is short of material and gives an alarm'; when the curing agent level detection switch 13 is at a high level of "1", it indicates that the curing agent barrel 4 is filled. When the new/old sand material level detection switch is at a low level of '0', the material shortage of the new/old sand warehouse is indicated, the intelligent feeding system is suspended, and the display screen prompts 'material shortage alarm of the new/old sand warehouse'; when the new/old sand material level detection switch is at a high level of '1', indicating that the new/old sand warehouse is filled with materials, and when the new/old sand discharging valve is at a low level of '0', indicating that the new/old sand discharging valve is closed, sucking the materials to the old sand vacuum tank 2 through the vacuum sand sucking mechanism 46 of the new/old sand vacuum tank, and when the feeding vent port 14 of the new/old sand warehouse is at a high level of '1', indicating that the feeding vent port 14 of the new/old sand warehouse is closed; when the vacuum sand sucking mechanism 46 of the new/used sand vacuum tank reaches the set sand sucking time, the feeding air port 14 of the new/used sand warehouse is at a low level of '0', which means that the feeding air port 14 of the new/used sand warehouse is opened, and the vacuum sand sucking mechanism 46 continues sucking materials to the new/used sand vacuum tank; when the loading air vent 14 of the new/old sand warehouse is opened for a preset time, the new/old sand vacuum tank is filled, and the new/old sand pumping is stopped. After the new/used sand vacuum tank finishes exhausting, converting the output analog quantity into digital quantity readable by a PLC (programmable logic controller) through a new/used sand weighing device respectively, and converting to obtain the actual weight of the new/used sand respectively; and meanwhile, calculating the weight of the curing agent and the additive through a formula, sending the weight of the additive to an additive feeding work flow, and jumping to a new/old vacuum tank material feeding and sand discharging work flow.

The new/old sand vacuum tank material charging and sand discharging work flow is as follows:

when the new/used sand vacuum tank is filled with materials, the new/used sand pumping working process is stopped, the stirring tank is empty, the stirring tank blanking valve 501 is closed when the stirring tank blanking valve 501 is at a low level of 0, the new/used sand blanking valve is opened when the new/used sand blanking valve is at a high level of 1, the new/used sand blanking valve discharges the new/used sand of the new/used sand vacuum tank into the stirring tank 5 through a sand conveying pipeline, and meanwhile, the quantity of curing agents required by the weight of the currently pumped new/used sand is sent to the stirring working process; when the opening time of the new/old sand blanking valve reaches the preset time, the new/old sand blanking valve is changed from a high level of '1' to a low level of '0', the blanking of the new/old sand vacuum tank is finished, and when the new/old sand blanking valve is closed in place, the weight of the new/old sand and the curing agent required by the new sand are reset, the new/old sand vacuum tank is reset with the material (the new/old sand vacuum tank is changed into no material), the program jumps to the new/old sand working flow, and the program jumps to the stirring working flow.

Additive feeding work flow:

when the additive material level detection switch 12 is at a low level of '0', the material shortage of the additive warehouse 9 is indicated, the action of the intelligent feeding system is suspended, and the display screen prompts 'material shortage alarm of the additive warehouse'; when the additive blanking valve 20 is at a low level of "0", it indicates that the additive blanking valve 20 is closed (additive operation is stopped), and when the additive level detection switch 12 is at a high level of "1", it indicates that the additive tank 9 is filled; meanwhile, the weight of the required additive is calculated according to the weight of the current new sand; the additive is fed into the additive vacuum tank 3 in a spiral feeding mode, the additive is weighed by the additive weighing device 17, when the weight of the required additive is reached, the spiral feeding is stopped, the additive vacuum tank 3 is charged, and the program jumps to the additive charging and discharging working process.

The working process of the additive material blanking comprises the following steps:

when the additive vacuum tank 3 is filled, the additive feeding working process is stopped, the stirring tank 5 is short of additive, the stirring tank blanking valve 501 is closed when the stirring tank blanking valve 501 is at the low level of 0, the additive blanking valve 20 is opened when the additive blanking valve 20 is at the high level of 1, the additive blanking valve 20 is discharged into the stirring tank 5 through a pipeline, when the additive blanking valve 20 is opened to the preset time, the additive blanking valve 20 is changed from the high level of 1 to the low level of 0, the additive blanking is finished, and when the additive blanking valve 20 is closed in place, the weight of the additive is reset, the additive vacuum tank 3 is reset (the additive vacuum tank 3 is filled with the additive to be empty), the program jumps to the additive feeding working process, and the program jumps to the stirring working process.

And (3) stirring work flow:

stopping the working flow of the additive material feeding when new sand and old sand exist in the stirring pool; when the stirring machine reaches the stirring set time, the new sand, the old sand, the curing agent and the additive are uniformly mixed, the stirring machine stops stirring when the stirring machine is at 0, the stirring pool 5 has materials, the program jumps to the sand discharging working flow after the stirring is finished, and simultaneously the sand discharging working flow of the new/old sand vacuum tank after the new/old sand is stopped.

And (3) sand discharging work flow after stirring is finished:

when the stirring tank discharging valve 501 has material and the stirring is finished, and when the material is discharged, one of the following four conditions is met, the corresponding sand receiving working process of the receiving hopper 6 is skipped: the material receiving process comprises a material receiving 1 process, a material receiving 2 process, a material receiving 3 process and a material receiving 4 process. When the stirring tank blanking valve 501 is at a high level of 1, the stirring tank blanking valve 501 is opened for blanking, when the stirring machine is at a high level of 1, the stirring machine starts to automatically blank sand, when the blanking time reaches a set time, the stirring machine stops blanking, when the stirring machine is changed from the high level of 1 to a low level of 0, the stirring machine stops blanking, when the stirring tank blanking valve 501 is at a low level of 0, the stirring tank blanking valve 501 is closed for stopping blanking, when the stirring tank blanking valve 501 is closed, the material is reset, the sand blanking working flow is finished after the stirring is finished from the material existence state to the material nonexistence state, the program jumps to the automatic additive material existence blanking working flow, the program jumps to the material existence sand blanking working flow of the new/old vacuum sand tank, and the program jumps to the stirring working flow.

The working flow of receiving the sand by the receiving hopper is as follows:

material receiving 1 process: when the material level detection switch 22 of the receiving hopper is at a low level of 0, the receiving hopper 6 is empty (namely no material), the stirring tank blanking valve 501 finishes stirring and has material, the residual sand vacuum tank 24 has no material, the program jumps to the working flow of sand blanking after stirring, and the residual sand vacuum tank 24 stops sand blanking;

material receiving 2 flow: when the material level detection switch 22 of the receiving hopper is at a low level of '0', the receiving hopper 6 is empty, the material is filled after the stirring of the material filling valve 501 of the stirring pool is finished, and the material is filled in the residual sand vacuum tank 24, so that the residual sand vacuum tank 24 fills sand, and the sand filling work flow after the stirring is finished is stopped;

material receiving 3 flow: when the material level detection switch 22 of the receiving hopper is at a high level of 1, the receiving hopper 6 is filled, the stirring tank discharging valve 501 is filled after stirring is completed, the residual sand vacuum tank 24 is filled, the sand discharging work flow after stirring is stopped, and the residual sand vacuum tank 24 is stopped to discharge sand;

material receiving 4 flow: when the material level detection switch 22 of the receiving hopper is at the high level of "1", the receiving hopper 6 is filled with the material, the stirring tank blanking valve 501 is filled with the material after the stirring is finished, and the residual sand vacuum tank 24 is filled with the material, the program jumps to the sand blanking working process after the stirring is finished, and the residual sand vacuum tank 24 is stopped to perform the sand blanking.

The three-dimensional printing system comprises the following working procedures: the method comprises a main machine tank feeding work flow, a main machine tank material feeding and sand discharging work flow, a sand storage hopper sand receiving work flow, a sand box sand laying work flow and an online excess material recovery system work flow.

When the three-dimensional printing system starting button is changed from the low level of 0 to the high level of 1, the three-dimensional printing device is changed from the stop mode to the automatic running mode.

The main machine tank feeding work flow is as follows:

when the material level detection switch 22 of the receiving hopper is in a low level of 0, the receiving hopper 6 is indicated to be short of material, the main machine tank 23 stops the feeding action, and the display screen prompts the receiving hopper to give an alarm for short of material; when the material level detection switch 22 of the material receiving hopper is in a high level of '1', the material receiving hopper 6 is filled, and the blanking valve 37 of the main machine tank is in a low level of '0', the blanking valve 37 of the main machine tank is closed, the vacuum sand sucking mechanism 46 of the main machine tank 23 sucks the material to the main machine tank 23, and meanwhile, when the material loading air vent 14 of the material receiving hopper 6 is in a high level of '1', the material loading air vent 14 of the material receiving hopper 6 is closed; when the host tank 23 vacuum sand suction mechanism 46 reaches the set time, the feeding air port 14 of the receiving hopper 6 is at the low level of "0", which means that the feeding air port 14 of the receiving hopper 6 is opened, and the host tank 23 vacuum sand suction mechanism 46 continues to suck materials to the host tank 23; when the opening time of the feeding vent 14 of the receiving hopper 6 reaches the preset time, sand pumping is stopped, the host tank 23 is filled, and the program jumps to the host tank 23 to fill the sand feeding working process.

The main machine tank 23 has a material feeding and sand discharging work flow:

when the main machine tank 23 is filled with materials, the loading working process of the main machine tank 23 is stopped, the unloading valve 37 of the main machine tank is closed, the material level detection switch 38 of the sand storage hopper is in a high level of '1' to indicate that the sand storage hopper 34 is filled with materials, and the execution of the loading and unloading working process of the main machine tank 23 is automatically stopped; when the material level detection switch 38 of the sand storage hopper is at a low level of '0', the sand storage hopper 34 is lack of material, and the working process of material charging and sand discharging of the main machine tank 23 is automatically executed; when the main tank blanking valve 37 is at a high level of "1", the main tank blanking valve 37 is opened, the material of the main tank 23 is discharged into the sand storage hopper 34 through the sand conveying pipeline, when the opening time of the main tank blanking valve 37 reaches a preset time, the main tank blanking valve 37 is at a low level of "0", the main tank 23 is blanked, and when the main tank blanking valve 37 is closed in place, the main tank 23 is reset to have the material, and the material is changed into not to have the material; the program jumps to the main tank 23 loading workflow.

The working process of the on-line excess material recovery system is as follows: the sand which is left after the three-dimensional printing equipment is paved for each time is conveyed to a residual sand hopper 25 through a sand conveying belt 30, and then the residual materials are conveyed into a receiving hopper 6 through a vacuum sucking and conveying mechanism of a residual sand vacuum tank 24.

The residual sand vacuum tank sand pumping work flow is as follows:

when the residual sand material level detection switch 33 is at a low level of '0', indicating that the residual sand hopper 25 is short of material, and suspending the residual sand feeding operation flow; when the residual sand material level detection switch 33 is at a high level of '1', indicating that the residual sand hopper 25 is filled with material, and when the residual sand blanking valve 32 is at a low level of '0', indicating that the residual sand blanking valve 32 is closed, the vacuum sand suction mechanism 46 of the residual sand vacuum tank 24 automatically sucks material to the residual sand vacuum tank 24, and simultaneously when the residual sand blanking valve 32 is at a high level of '1', indicating that the residual sand blanking valve 32 is closed; when the residual sand vacuum sand suction system reaches the set time and the residual sand blanking valve 32 is at the low level of '0', the residual sand blanking valve 32 is opened, and the vacuum sand suction mechanism 46 of the residual sand vacuum tank 24 continues to suck materials to the residual sand vacuum tank 24; when the opening time of the residual sand discharging valve 32 reaches the preset time, the residual sand vacuum tank 24 is charged, the charging working process of the residual sand vacuum tank 24 is stopped, and the program jumps to the sand receiving working process of the receiving hopper 6 (when one of the following four conditions is met, the program jumps to the corresponding receiving flow, namely the receiving 1 flow, the receiving 2 flow, the receiving 3 flow and the receiving 4 flow).

This embodiment is through setting up intelligent feeding system, the ratio proportion of new sand and used sand of input on the display screen, then the system calculates the volume of required additive and curing agent automatically, and carry out the material loading stirring automatically, automation has been realized, the batching of high accuracy, the material loading, sand mould three-dimensional inkjet printer is in continuous automated production process, can't realize newly through feeding system, the problem of the fixed proportion batching of used sand, and simultaneously, adopt the method that intelligent feeding system replaces artifical material loading, the labour has not only been liberated, the labor cost is reduced, the ratio precision has still been effectively improved, and then the sand mould quality has been promoted. Through setting up online clout recovery system, the clout sand that produces when making the printing is through sending sand pipe to carry to connect hopper 6 in to supply three-dimensional printing equipment to recycle, realized the automatic recovery of clout, solved because of can't retrieve the clout problem of low utilization ratio that the clout caused.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. An automatic control system of a sand mold three-dimensional printer is characterized by comprising an intelligent feeding system, an online excess material recovery system, a three-dimensional printing system and an upper computer;

the upper computer is respectively connected with the intelligent feeding system, the online excess material recovery system and the three-dimensional printing system, and is used for issuing control instructions to the intelligent feeding system, the online excess material recovery system and the three-dimensional printing system to control the normal operation of each system;

a new sand vacuum tank, a used sand vacuum tank and an additive vacuum tank are arranged in the intelligent feeding system, a residual sand vacuum tank is arranged in the online residual material recovery system, a sand cleaning vacuum tank and a host tank are arranged in the three-dimensional printing system, and the new sand vacuum tank, the used sand vacuum tank, the additive vacuum tank, the residual sand vacuum tank, the sand cleaning vacuum tank and the host tank all comprise vacuum tank bodies and vacuum sand suction mechanisms;

a drum is inserted into the tank opening cover, the part of the drum inserted into the tank opening cover is a filter screen, and the part of the drum not inserted into the tank opening cover is provided with the back-blowing pneumatic pipe interface and the vacuum pneumatic conveying pipe interface; the vacuum pneumatic conveying pipe interface is connected with an air inlet of a fan, the fan is used for extracting air in the vacuum tank body, a back-blowing pneumatic valve is mounted on the back-blowing pneumatic pipe interface, and the back-blowing pneumatic valve utilizes the air pressure difference between the inside and the outside of the vacuum tank body to feed air into the vacuum tank body so as to back-blow the filter screen;

2. The automatic control system of the sand mold three-dimensional printer according to claim 1, wherein the intelligent feeding system comprises a new sand vacuum tank, a used sand vacuum tank, an additive vacuum tank, a curing agent barrel, a stirring pool and a receiving hopper;

a new sand blanking valve is arranged on a sand conveying pipeline between a blanking port of the new sand vacuum tank and the stirring pool, a used sand blanking valve is arranged on a sand conveying pipeline between a blanking port of the used sand vacuum tank and the stirring pool, an additive blanking valve is arranged on a pipeline between a blanking port of the additive vacuum tank and the stirring pool, and a quantitative pump is arranged on a pipeline between a blanking port of the curing agent barrel and the stirring pool;

3. An automatic control system of a sand mould three-dimensional printer according to claim 1, wherein the online excess material recovery system comprises an excess sand vacuum tank, an excess sand hopper, a sand guide hopper, a driving wheel, a driven wheel, a belt supporting wheel, a sand conveying belt and a driving motor;

4. An automatic control system for a sand mould three-dimensional printer according to claim 1, wherein the three-dimensional printing system comprises a three-dimensional printing device, a host tank, a sand storage hopper, a sand cleaning vacuum tank and a sand box;

5. An automatic control system of a sand mould three-dimensional printer according to claim 2, wherein the new sand weighing device, the used sand weighing device and the additive weighing device are all composed of a plurality of weighing sensors, a plurality of fixing lugs and a frame, the fixing lugs are uniformly arranged at the bottom of the outer side of the vacuum tank body, the weighing sensors are uniformly arranged on the fixing plate surface of the frame, the weighing sensors and the frame form a whole, and the weighing sensors are contacted with the fixing lugs;

the amount of additive is the actual weight of fresh sand;

6. An automatic control system for a sand mold three-dimensional printer according to claim 5, wherein said weighing sensors in said new sand weighing device, said used sand weighing device and said additive weighing device are at least three, and said fixing lugs are also at least three.

7. An automatic control system of a sand mold three-dimensional printer according to claim 4, wherein a lifting bottom plate is arranged in the sand box, and the lifting bottom plate is used for loading sand materials and lifting;

the sand scraping mechanism comprises a scraper and a sand scraping hopper, the scraper is located right above the lifting bottom plate, the scraper is used for collecting residual sand on the lifting bottom plate and scraping the residual sand onto the sand conveying belt, and the sand scraping hopper is used for temporarily storing the residual sand collected by the scraper.

8. An automatic control system for a sand mould three-dimensional printer according to claim 7, wherein said sand conveying belt is arranged adjacent to said sand box and is maintained at the same level with the top of said sand box, ensuring that all the remaining sand is scraped off by said scraper onto said sand conveying belt.

9. A control method of a sand mold three-dimensional printer is characterized by comprising the following specific steps:

s1: starting an automatic control system of the sand mold three-dimensional printer; the automatic control system of the sand mold three-dimensional printer comprises an intelligent feeding system, an online excess material recovery system, a three-dimensional printing system and an upper computer;

the receiving hopper is used for temporarily receiving the uniformly mixed sand material and the recovered residual sand, the receiving hopper is provided with a receiving hopper material level detection switch for detecting the existence of the sand material, and a feeding air vent of the receiving hopper is communicated with a host tank of the three-dimensional printing system through a sand conveying pipeline;

the tail end of the advancing direction of the sand conveying belt is connected with the sand guide hopper, the residual sand hopper is arranged right below the sand guide hopper, and the sand guide hopper is used for guiding residual sand on the sand conveying belt into the residual sand hopper; a residual sand level detection switch for detecting whether residual sand exists is arranged in the residual sand hopper;

the sand box is communicated with a feeding port of the sand cleaning vacuum tank, and the sand cleaning vacuum tank is used for storing old sand to be cleaned; a feed opening of the sand cleaning vacuum tank is communicated with the used sand warehouse, and a sand cleaning feed valve is arranged between the feed opening of the sand cleaning vacuum tank and the used sand warehouse;

the sand conveying belt is arranged adjacent to the sand box, and the sand conveying belt and the top of the sand box keep the same horizontal plane, so that the scraper can ensure that all residual sand is scraped onto the sand conveying belt;

the new sand vacuum tank, the used sand vacuum tank, the additive vacuum tank, the residual sand vacuum tank, the sand cleaning vacuum tank and the host tank respectively comprise a vacuum tank body and a vacuum sand sucking mechanism;

when the tank cover fixed valve, the back-blowing pneumatic valve and each blanking valve are in a closed state, the filter screen is normally filtered, the sand suction interface is connected into a corresponding sand warehouse through a sand conveying pipeline, air in the vacuum tank body is continuously sucked through the continuous air suction work of the fan, continuous suction is generated at the sand suction interface, the sand conveying pipeline sucks sand materials from the sand warehouse into the vacuum tank body, and when the continuous suction time reaches a preset time, the fan stops air suction work and stops sucking materials;

s4: the online excess material recovery system recovers and prints unused excess materials, and conveys the excess materials to the intelligent feeding system for recycling;

closing a new sand vacuum tank, a used sand vacuum tank and a tank opening cover fixed valve, a back-blowing pneumatic valve and a blanking valve of an additive vacuum tank, normally filtering a filter screen, opening a fan to continuously exhaust air, continuously extracting air in the new sand vacuum tank, the used sand vacuum tank and the vacuum tank body of the additive vacuum tank, and generating continuous suction at a sand suction interface, wherein the suction forces a sand conveying pipeline to respectively and correspondingly suck new sand, used sand and additives from a new sand warehouse, a used sand warehouse and an additive warehouse and correspondingly add the new sand, the used sand and the additives into the vacuum tank bodies of the new sand vacuum tank, the used sand vacuum tank and the additive vacuum tank; when the continuous material suction time reaches the preset time, stopping air suction operation of the fan and stopping material suction;

the amount of additive is the actual weight of fresh sand;

s23: opening a new sand blanking valve, a used sand blanking valve and an additive blanking valve, and blanking the new sand vacuum tank, the used sand vacuum tank and the additive vacuum tank into the stirring pool by using a vacuum sand sucking mechanism according to the calculated putting amounts of the new sand, the used sand and the additive; meanwhile, a quantitative pump is started, and the curing agent in the curing agent barrel is quantitatively pumped into the stirring pool;