CN110385396B - Sand mixer - Google Patents

Abstract

The invention discloses a sand mixer, which comprises a base; the top of the base is connected with the large arm mechanism through a first swing mechanism; the large arm mechanism comprises an upper chamber for conveying used sand and a lower chamber for conveying new sand; the upper part of the head end of the large arm mechanism is provided with a sand inlet mechanism, and the sand inlet mechanism is provided with a first sand inlet communicated with the upper chamber and a second sand inlet communicated with the lower chamber; the bottom of the tail end of the large arm mechanism is connected with the double-small arm mechanism through a second swing mechanism; the double-small-arm mechanism comprises an upper small-arm mechanism and a lower small-arm mechanism which are fixedly connected up and down. The old sand and the new sand of the sand mixer respectively enter the upper small arm mechanism and the lower small arm mechanism through different channels, the old sand and the new sand can be added simultaneously, and only the old sand or only the new sand can be added, so that only one sand mold is mixed; therefore, the sand mixer has the functions of adding sand to old sand and new sand simultaneously and adding sand respectively, time is saved, and materials are not wasted.

Description

Sand mixer

Technical Field

The invention belongs to the technical field of casting, and particularly relates to a sand mixer.

Background

The sand mixer is suitable for continuous mixing of various self-hardening sands such as modified water glass and the like in the production of cast steel, cast iron and nonferrous alloy, can meet the requirement of single-piece small-batch manual molding, and can also be configured in a core shooter and a mechanized molding core production line for use.

At present, according to different technological requirements of castings, new mixed sand and old mixed sand need to be added when the castings are molded in a sand box, a layer of mixed old sand needs to be covered firstly, and then mixed new sand needs to be added, namely, a sand mixer needs to respectively mix the new sand and the old sand during casting and molding. However, most of the existing sand mixers can only mix one sand material with liquid materials such as curing agents, so after the sand mixer completely mixes the used sand with the liquid materials such as curing agents, new sand can be added after all the used sand in the sand mixer is cleaned, and then the new sand is mixed, which wastes time and waste of the used sand.

Therefore, it is urgently needed to design a sand mixer, which has the functions of adding sand simultaneously and respectively into old sand and new sand, so that time is saved, materials are not wasted, and the sand mixer has important significance for improving production efficiency and casting quality.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a sand mixer.

In order to achieve the purpose, the invention adopts the following technical scheme:

a sand mixer comprises

A base;

the top of the base is connected with the large arm mechanism through a first swing mechanism; the large arm mechanism comprises an upper chamber for conveying used sand and a lower chamber for conveying new sand;

a sand feeding mechanism is arranged at the upper part of the head end of the large arm mechanism, and a first sand feeding port communicated with the upper cavity and a second sand feeding port communicated with the lower cavity are arranged on the sand feeding mechanism;

the bottom of the tail end of the large arm mechanism is connected with the double-small arm mechanism through a second swing mechanism; the double-small-arm mechanism comprises an upper small-arm mechanism and a lower small-arm mechanism, wherein the upper small-arm mechanism and the lower small-arm mechanism are fixedly connected up and down and are used for mixing used sand and new sand; the upper small arm mechanism and the lower small arm mechanism are both connected with a liquid material system for providing adhesives and curing agents;

the tail end of the upper chamber is communicated with the upper small arm mechanism, and the tail end of the lower chamber is communicated with the lower small arm mechanism.

Preferably, the first sand inlet is of a round table structure with a thick upper part and a thin lower part, a second sand inlet is fixedly arranged at the rear part of the first sand inlet, and the second sand inlet is of a semi-funnel structure;

a first sand inlet pipe communicated with the upper cavity is arranged at the bottom of the first sand inlet;

the bottom of the second sand inlet is provided with a second sand inlet pipe communicated to the lower cavity;

the side walls of the first sand inlet pipe and the second sand inlet pipe are vertically and fixedly provided with sand inlet connecting plates; the other side of the sand inlet connecting plate is fixedly connected with the sand inlet fixing plate through a sand inlet supporting frame; and the sand inlet fixing plate is fixedly connected with the top of the first rotating mechanism.

Preferably, the first rotating mechanism comprises a first rotating table, a first motor connecting hole and a first rotating cylinder connecting hole are formed in the first rotating table, a first motor is fixedly arranged in the first motor connecting hole, and a first rotating cylinder is rotatably connected in the first rotating cylinder connecting hole;

a first annular supporting plate is fixedly arranged at the top of the first rotary cylinder, and two first supporting lug plates used for being connected with the head end of the large arm mechanism are symmetrically and fixedly arranged on the first annular supporting plate; two ends of the sand inlet fixing plate are respectively fixedly connected with the two first supporting ear plates;

a first driven gear is fixedly arranged at the bottom of the first rotary drum, the first driven gear is in gear meshing connection with a first driving gear, and the first driving gear is coaxially and fixedly connected with a rotating shaft of a first motor;

the first driven gear is rotatably connected with the base at the bottom.

Preferably, the large arm mechanism comprises a large arm base, and a large arm body in a cylindrical structure is fixedly arranged at the upper part of the large arm base;

a first channel which is communicated with the first sand inlet and extends into the large arm body is arranged at the center of the upper part of the head end of the large arm body; the rear end of the upper part of the head end of the big arm body is provided with a second channel which is communicated with the second sand inlet and extends into the big arm body;

a belt conveying mechanism distributed along the length direction of the large arm body is arranged in the upper cavity inside the large arm body; the belt conveying mechanism comprises two electric rollers connected with the side wall of the large arm body, an annular belt used for conveying used sand is arranged on each electric roller, and the first channel is positioned right above the annular belt;

a spiral conveying mechanism distributed along the length direction of the large arm body is arranged in a lower cavity inside the large arm body, the spiral conveying mechanism comprises a spiral conveying cylinder body, and the second channel is communicated into the spiral conveying cylinder body;

a sand outlet mechanism is fixedly arranged at the bottom of the tail end of the large arm body and comprises a second sand outlet channel positioned in the middle, the top of the second sand outlet channel is communicated to a spiral sand outlet groove at the bottom of the tail end of the spiral conveying cylinder body, and the bottom of the second sand outlet channel is communicated to the lower small arm mechanism; the front end and the rear end of the second sand outlet channel are respectively provided with a first sand outlet channel, the top of the first sand outlet channel is communicated to the tail end of the annular belt, and the bottom of the first sand outlet channel is communicated to the upper small arm mechanism.

Preferably, the second swing mechanism comprises a second fixed plate, and two second supporting lug plates used for being connected with the tail end of the large arm mechanism are symmetrically and fixedly arranged on the second fixed plate;

a second motor is arranged at the upper part of the second fixing plate, the rotating shaft of the second motor passes through the second fixing plate downwards to be coaxially and fixedly connected with a second driving gear, and the second driving gear is in gear meshing connection with a second driven gear;

the second driven gear is rotatably connected with the bottom of the first fixing plate, and the bottom of the second driven gear is fixedly connected with the double-small-arm mechanism;

and a second transition channel communicated with the second sand outlet channel is arranged in the middle of the second fixing plate, and first transition channels communicated with the first sand outlet channels are symmetrically arranged on two sides of the second transition channel.

Preferably, the upper small arm mechanism and the lower small arm mechanism are fixedly connected through a small arm cross beam; an upper bearing end cover is arranged at the right end of the upper small arm mechanism, and the bottom of the upper bearing end cover is fixedly connected with the small arm cross beam; a lower bearing end cover is arranged at the right end of the lower small arm mechanism, and the top of the lower bearing end cover is fixedly connected with the small arm cross beam;

the upper small arm mechanism comprises an upper sand mixing barrel, and the lower small arm mechanism comprises a lower sand mixing barrel; the upper sand mixing cylinder and the lower sand mixing cylinder are both internally provided with sand mixing mechanisms;

the sand mixing mechanism comprises a sand mixing rotating shaft, the sand mixing rotating shaft in the upper sand mixing barrel is rotatably connected with two ends of the upper sand mixing barrel, and the sand mixing rotating shaft in the lower sand mixing barrel is rotatably connected with two ends of the lower sand mixing barrel through bearings; the end part of the sand mulling rotating shaft is coaxially and fixedly connected with a rotating shaft of a sand mulling motor; a stirring cage blade is arranged on the side wall of the sand mixing rotating shaft, and a cutter head is embedded in the stirring cage blade;

the head end of the double-small-arm mechanism is provided with a small-arm sand feeding mechanism, and the top of the small-arm sand feeding mechanism is fixedly connected with the bottom of the second driven gear; the small arm sand feeding mechanism is used for communicating the second transition channel to the lower sand mixing barrel, and the small arm sand feeding mechanism is used for communicating the first transition channel to the upper sand mixing barrel;

the tail ends of the upper sand mixing barrel and the lower sand mixing barrel are respectively provided with a sand outlet, and a sand outlet control mechanism for controlling the opening size of the sand outlet is arranged at the sand outlet.

Preferably, the small arm sand feeding mechanism comprises an upper sand feeding cavity communicated with the head end of the upper sand mixing cylinder and a lower sand feeding cavity communicated with the head end of the lower sand mixing cylinder;

one end of the upper sand inlet cavity is provided with an upper round hole connected with the head end of the upper sand mixing barrel, and the other end of the upper sand inlet cavity is provided with an upper rotating hole rotatably connected with a sand mixing rotating shaft in the upper sand mixing barrel;

one end of the lower sand inlet cavity is provided with a lower round hole connected with the head end of the lower sand mixing cylinder, and the other end of the lower sand inlet cavity is provided with a lower rotating hole rotatably connected with a sand mixing rotating shaft in the lower sand mixing cylinder;

the top of the small arm sand feeding mechanism is provided with a middle sand feeding pipe communicated with the bottom of the second transition passage, and the middle sand feeding pipe is communicated into the lower sand feeding cavity through a passage between the side wall of the small arm sand feeding mechanism and the outer side wall of the upper sand feeding cavity;

and sand inlet channels corresponding to the bottoms of the first transition channels are arranged around the middle sand inlet pipe and communicated to the upper sand inlet cavity.

Preferably, the upper sand mixing barrel comprises an upper transition pipe which is coaxially and fixedly connected with the upper round hole, an upper sand mixing main barrel is arranged at the end part of the upper transition pipe, the upper sand mixing main barrel comprises two semicircular barrels, and the end parts of the two semicircular barrels are hinged with the side wall of the small arm sand feeding mechanism;

the structure of the lower sand mixing barrel is consistent with that of the upper sand mixing barrel.

Preferably, the sand outlet control mechanism comprises a sand outlet shell, one side of the sand outlet shell is provided with a sand outlet control port attached to the sand outlet, and the bottom of the sand outlet shell is provided with a shakeout port;

a sand outlet control hydraulic cylinder is fixedly arranged on the side wall of the other side of the sand outlet shell, and a piston rod of the sand outlet control hydraulic cylinder is fixedly connected with a sand baffle mechanism; the sand baffle mechanism comprises a sand baffle capable of completely blocking a sand outlet of the pillar, a sliding block which is in sliding connection with a sliding groove in the side wall of the sand outlet shell is arranged on the side wall of the sand baffle, and a connecting plate which is used for being connected with a piston rod of the sand outlet control hydraulic cylinder is arranged on the sliding block; the sand outlet control hydraulic cylinder controls the size of the opening of the sand outlet by controlling the sand baffle plate to slide along the sliding groove.

Preferably, the liquid material system comprises a water glass supply system, a fast ester curing agent supply system and a slow ester curing agent supply system;

the water glass supply system is connected with an upper water glass inlet on the upper sand mixing cylinder and a lower water glass inlet on the lower sand mixing cylinder;

the quick ester curing agent supply system is connected with an upper quick grease inlet on the upper sand mixing cylinder and a lower quick grease inlet on the lower sand mixing cylinder;

and the slow ester curing agent supply system is connected with an upper slow grease inlet on the upper sand mixing cylinder and a lower slow grease inlet on the lower sand mixing cylinder.

The invention has the beneficial effects that:

when the sand mixer is used specifically, the old sand and the new sand respectively enter the upper small arm mechanism and the lower small arm mechanism through different channels, so that sand adding channels, conveying channels and mixing channels of the old sand and the new sand in the sand mixer are different, the old sand and the new sand can be simultaneously added according to the requirement of a casting, the new sand and the old sand are simultaneously mixed in different small arms, and only the old sand or only the new sand can be added, so that only one sand mold is mixed; therefore, the sand mixer has the functions of adding sand to old sand and new sand simultaneously and adding sand respectively, time is saved, materials are not wasted, and production efficiency and casting quality can be improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic structural diagram of a sand mixer of the present invention;

FIG. 2 is a schematic structural view of a sand feeding mechanism according to the present invention;

FIG. 3 is a first schematic perspective view of the first rotating mechanism according to the present invention;

FIG. 4 is a schematic perspective view of a second embodiment of the first rotary mechanism of the present invention;

FIG. 5 is a schematic structural view of the boom mechanism of the present invention;

FIG. 6 is a schematic view of the internal structure of the boom mechanism according to the present invention;

FIG. 7 is a first schematic view of the internal structure of the sand discharging mechanism at the tail end of the boom mechanism according to the present invention;

FIG. 8 is a second schematic view of the internal structure of the sand discharging mechanism at the tail end of the boom mechanism according to the present invention;

FIG. 9 is a schematic structural view of a belt conveying mechanism and a screw conveying mechanism in the present invention;

FIG. 10 is a schematic structural view of a main support in the present invention;

FIG. 11 is a schematic structural diagram of a second swing mechanism according to the present invention;

FIG. 12 is a first schematic structural view of the forearm mechanism of the present invention;

FIG. 13 is a second schematic structural view of the small arm mechanism of the present invention;

FIG. 14 is a schematic view of the semi-circular barrel of the present invention in an expanded configuration;

FIG. 15 is a schematic structural view of a small arm sand feeding mechanism according to the present invention;

FIG. 16 is a schematic view of the internal structure of the small arm sand feeding mechanism according to the present invention;

FIG. 17 is a schematic structural view of a sand discharge control mechanism according to the present invention;

FIG. 18 is a schematic view of the internal structure of the sand discharge control mechanism according to the present invention;

FIG. 19 is a schematic view of the assembly of the sand discharge control mechanism with the upper sand mixing barrel according to the present invention;

FIG. 20 is a cross-sectional view of the first swing mechanism of FIG. 1;

wherein:

1-a base;

2-a first rotary mechanism, 21-a first rotary cylinder, 22-a first annular supporting plate, 23-a first supporting lug plate, 24-a first circular clamping groove, 25-a first driven gear, 26-a first driving gear, 27-a first motor, 28-a first rotary table and 29-a first hydraulic cylinder;

3-big arm mechanism, 31-upper chamber, 32-lower chamber, 33-big arm base, 34-big arm body, 341-first channel, 342-second channel, 343-sand outlet groove, 344-baffle, 35-belt transmission mechanism, 351-electric roller, 352-annular belt, 353-tensioning roller, 354-supporting roller, 355-inclined supporting roller, 36-spiral conveying mechanism, 361-spiral conveying cylinder, 362-spiral shaft, 363-spiral blade, 364-spiral conveying motor, 365-spiral sand outlet groove, 37-sand outlet mechanism, 371-second sand outlet channel, 372-first sand outlet channel and 38-main bracket;

4-a sand feeding mechanism, 41-a first sand feeding port, 42-a second sand feeding port, 43-a first sand feeding pipe, 44-a second sand feeding pipe, 45-a sand feeding connecting plate, 46-a sand feeding supporting frame and 47-a sand feeding fixing plate;

5-double small arm mechanism, 51-upper small arm mechanism, 511-upper bearing end cover, 512-upper sand mixing cylinder, 5121-upper transition pipe, 5122-upper sand mixing main cylinder, 5123-semicircular cylinder, 513-upper water glass inlet, 514-upper quick grease inlet, 515-upper slow grease inlet, 52-lower small arm mechanism, 521-lower bearing end cover, 522-lower sand mixing cylinder, 523-lower water glass inlet, 524-lower quick grease inlet, 525-lower slow grease inlet, 53-small arm beam, 54-sand mixing mechanism, 541-sand mixing rotating shaft, 542-sand mixing motor, 543-stirring cage blade, 55-small arm sand feeding mechanism, 551-upper sand feeding cavity, 5511-upper round hole, 5512-upper rotating hole, 552-lower sand feeding cavity, 5521-lower round hole, 5522-lower rotary holes, 553-middle sand inlet pipes, 554-sand inlet channels, 56-sand outlets, 57-sand outlet control mechanisms, 571-sand outlet shells, 572-sand outlet control ports, 573-shakeout ports, 574-sand outlet control hydraulic cylinders, 575-sand baffles, 576-sliding grooves, 577-sliding blocks and 578-connecting plates 578;

6-a second swing mechanism, 61-a second fixing plate, 62-a second supporting lug plate, 621-a second circular clamping groove, 63-a second motor, 64-a second driving gear, 65-a second driven gear, 66-a second transition channel and 67-a first transition channel;

the flow rate of the sand is → the passage of the used sand,

and (4) a new sand channel.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In the present invention, terms such as "left", "right", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only terms of relationships determined for convenience in describing structural relationships of the components or elements of the present invention, and are not intended to refer to any components or elements of the present invention, and should not be construed as limiting the present invention.

In the present invention, terms such as "connected" and "connecting" should be interpreted broadly, and mean either a fixed connection or an integral connection or a detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.

The invention is further illustrated with reference to the following figures and examples.

As shown in FIG. 1, a sand mixer comprises

A base 1;

the top of the base 1 is connected with a large arm mechanism 3 through a first rotary mechanism 2; the large arm mechanism 3 comprises an upper chamber 31 for conveying used sand and a lower chamber 32 for conveying new sand;

a sand feeding mechanism 4 is arranged at the upper part of the head end of the large arm mechanism 3, and a first sand inlet 41 communicated with the upper chamber 31 and a second sand inlet 42 communicated with the lower chamber 32 are arranged on the sand feeding mechanism 4;

the bottom of the tail end of the large arm mechanism 3 is connected with the double small arm mechanism 5 through a second swing mechanism 6; the double-small-arm mechanism 5 comprises an upper small-arm mechanism 51 and a lower small-arm mechanism 52, wherein the upper small-arm mechanism 51 and the lower small-arm mechanism 52 are fixedly connected up and down and are used for mixing used sand and new sand; the upper small arm mechanism 51 and the lower small arm mechanism 52 are both connected with a liquid material system for providing adhesives and curing agents;

the tail end of the upper chamber 31 is communicated with an upper small arm mechanism 51, and the tail end of the lower chamber 32 is communicated with a lower small arm mechanism 52.

Preferably, as shown in fig. 2, the first sand inlet 41 is a round table structure with a thick upper part and a thin lower part, a second sand inlet 42 is fixedly arranged at the rear part of the first sand inlet 41, and the second sand inlet 42 is a semi-funnel structure;

the bottom of the first sand inlet 41 is provided with a first sand inlet pipe 43 communicated with the upper chamber 31;

the bottom of the second sand inlet 42 is provided with a second sand inlet pipe 44 communicated to the lower chamber 32;

the side walls of the first sand inlet pipe 43 and the second sand inlet pipe 44 are vertically and fixedly provided with a sand inlet connecting plate 45; the other side of the sand inlet connecting plate 45 is fixedly connected with a sand inlet fixing plate 47 through a sand inlet supporting frame 46; the sand inlet fixing plate 47 is fixedly connected with the top of the first rotating mechanism 2.

Preferably, as shown in fig. 3 to 4, the first rotating mechanism 2 includes a first rotating table 28, a first motor connecting hole and a first rotating drum connecting hole are formed in the first rotating table 28, a first motor 27 is fixedly disposed in the first motor connecting hole, and a first rotating drum 21 is rotatably connected to the first rotating drum connecting hole;

a first annular supporting plate 22 is fixedly arranged at the top of the first rotary cylinder 21, and two first supporting lug plates 23 used for being connected with the head end of the large arm mechanism 3 are symmetrically and fixedly arranged on the first annular supporting plate 22; two ends of the sand inlet fixing plate 47 are respectively fixedly connected with the two first supporting ear plates 23;

a first driven gear 25 is fixedly arranged at the bottom of the first rotary drum 21, the first driven gear 25 is in gear meshing connection with a first driving gear 26, and the first driving gear 26 is coaxially and fixedly connected with a rotating shaft of a first motor 27;

the first driven gear 25 is rotatably connected with the base 1 at the bottom.

That is, first motor 27 drives first driving gear 26 and rotates, first driving gear 26 drives first driven gear 25 and rotates, first driven gear 25 drives first rotary drum 21 and rotates, when first rotary drum 21 rotates, the head end of the big arm mechanism 3 installed between two first support otic placodes 23 also can rotate thereupon, first slewing mechanism 2 can carry out the direction gyration of 0 ~ 120 difference with big arm mechanism 3 in this application, realize the sand adding demand of sand box in different positions.

Preferably, as shown in fig. 5, the large arm mechanism 3 includes a large arm base 33, and a large arm body 34 having a cylindrical structure is fixedly disposed on an upper portion of the large arm base 33;

a first channel 341 which is communicated with the first sand inlet 41 and extends into the large arm body 3 is arranged at the center of the upper part of the head end of the large arm body 34; a second channel 342 which is communicated with the second sand inlet 42 and extends into the large arm body 3 is arranged at the rear end of the upper part of the head end of the large arm body 34;

as shown in fig. 6 and 9, a belt transfer mechanism 35 distributed along the length direction of the upper arm 34 is arranged in the upper chamber 31 inside the upper arm 34; the belt conveying mechanism 35 comprises two electric drums 351 connected with the side wall of the large arm body 3, wherein the electric drums 351 are oil-cooled electric drums, an annular belt 352 for conveying used sand is arranged on the electric drums 351, and the first channel 341 is positioned right above the annular belt 352; namely, the upper chamber 31 and the lower chamber 32 are respectively arranged on the upper arm body 34 through the lower layer of the annular belt 352;

as shown in fig. 6 and 9, a screw conveying mechanism 36 distributed along the length direction of the boom 34 is arranged in the lower chamber 32 inside the boom 34, the screw conveying mechanism 36 includes a screw conveying cylinder 361, a screw shaft 362 is arranged in the screw conveying cylinder 361, a plurality of screw blades 363 are uniformly arranged on the screw shaft 362, and the end of the screw shaft 363 is coaxially and fixedly connected with a rotating shaft of a screw conveying motor 364 through a coupling; the second channel 342 is communicated to the spiral conveying cylinder 361;

a sand outlet mechanism 37 is fixedly arranged at the bottom of the tail end of the large arm body 34, as shown in fig. 7-8, the sand outlet mechanism 37 comprises a second sand outlet channel 371 located in the middle, the top of the second sand outlet channel 371 is communicated to a spiral sand outlet groove 365 at the bottom of the tail end of the spiral conveying cylinder 361, and the bottom of the second sand outlet channel 371 is communicated to the lower small arm mechanism 52; the front end and the rear end of the second sand outlet 371 are respectively provided with a first sand outlet 372, the top of the first sand outlet 372 is communicated to the tail end of the annular belt 352, and the bottom of the first sand outlet 372 is communicated to the upper forearm mechanism 51;

specifically, as shown in fig. 7-8, a sand outlet groove 343 is provided at the bottom of the tail end of the upper arm 34, and the top of the second sand outlet passage 371 passes through the sand outlet groove 343 upwards and communicates with a spiral sand outlet groove 366 at the bottom of the tail end of the spiral conveying cylinder 361; the inner sides of the large arm bodies 34 at two sides of the tail end of the annular belt 352 are symmetrically provided with baffles 344 inclined downwards, two channels for old sand on the annular belt 352 to fall are formed between the baffles 344 and the outer side wall of the spiral conveying cylinder 361, and the channels are communicated with the first sand outlet channel 372.

Specifically, as shown in fig. 6 and 9, a plurality of tension rollers 353 are disposed at the bottom of the lower layer of the endless belt 352; a plurality of supporting rollers 354 are arranged at the bottom of the upper layer of the annular belt.

Specifically, as shown in fig. 6 and 9, a plurality of inclined support rollers 355 are disposed at the front and rear ends of the upper layer of the endless belt 352 to support the two sides of the belt obliquely upward, and the inclined support rollers 355 pile up the two sides of the upper layer of the belt obliquely upward, so as to prevent the transferred used sand from falling off from the two sides of the belt.

Specifically, a main support 38 is arranged inside the upper arm body 34, and two ends of the main support 38 are fixedly connected with two ends of the upper arm body 34; wherein, the tensioning idler 353, the supporting idler 354 and the inclined supporting idler 355 are all arranged on the main bracket 38; a plurality of clamping plates 381 are uniformly arranged on the main support 38 along the length direction, and arc-shaped clamping grooves for fixedly installing the spiral conveying cylinder 361 are formed in the bottoms of the clamping plates 381; here, the specific structure of the main support 38 can be realized by using the prior art, and therefore, the detailed description is omitted, and the structure shown in fig. 10 is adopted for the main support in this application, but the structure of the main support 38 is not limited to the structure shown in fig. 10, as long as the installation of the tension idler 353, the support idler 354, the diagonal support idler 355, and the spiral conveying cylinder 361 can be realized.

Preferably, as shown in fig. 3-4, the two first supporting ear plates 23 are symmetrically provided with first circular locking grooves 24 on opposite sides;

the front end and the rear end of the large arm base 33 are symmetrically provided with first connecting shafts, and the end parts of the first connecting shafts are rotatably connected with the first circular clamping grooves 24;

as shown in fig. 1, two first hydraulic cylinders 29 are rotatably connected to the side wall of the first rotary drum 21, and a piston rod of each first hydraulic cylinder 29 is rotatably connected to the large arm base 33.

The rotational connection between the first connecting shaft and the first circular locking groove 24 enables the upper and lower angles of the large arm mechanism 3 to be changed by the first hydraulic cylinder 29.

Preferably, as shown in fig. 11, the second rotating mechanism 6 includes a second fixed plate 61, and two second supporting ear plates 62 for connecting with the tail end of the large arm mechanism 3 are symmetrically and fixedly disposed on the second fixed plate 61;

a second motor 63 is arranged at the upper part of the second fixing plate 61, a rotating shaft of the second motor 63 downwards penetrates through the second fixing plate 61 to be coaxially and fixedly connected with a second driving gear 64, and the second driving gear 64 is in gear meshing connection with a second driven gear 65;

the second driven gear 65 is rotatably connected with the bottom of the first fixing plate 61, and the bottom of the second driven gear 65 is fixedly connected with the double-small-arm mechanism 5;

a second transition channel 66 communicated with the second sand outlet channel 371 is arranged in the middle of the second fixing plate 61, and first transition channels 67 communicated with the first sand outlet channel 372 are symmetrically arranged on two sides of the second transition channel 66; as shown in fig. 20, the bottom of second sand outlet 371 is inserted into second transition 66, and the bottom of first sand outlet 372 is inserted into the corresponding first transition 66.

Namely, the second motor 63 drives the second driving gear 64 to rotate, the second driving gear 64 drives the second driven gear 65 to rotate, the second driven gear 65 drives the double-small-arm mechanism 5 to rotate, and the second swing mechanism 6 can swing the double-small-arm mechanism 5 in different directions of 0-220 degrees in the application; meanwhile, when the first rotating mechanism 2 is started, the double-small-arm mechanism 5 also rotates along with the first rotating mechanism.

Preferably, as shown in fig. 11, the two second supporting ear plates 62 are symmetrically provided with second circular locking grooves 621 on opposite sides;

the front end and the rear end of the sand outlet mechanism 37 are symmetrically provided with a second connecting shaft, and the end part of the second connecting shaft is rotatably connected with a second circular clamping groove 621.

Preferably, as shown in fig. 12-13, the upper small arm mechanism 51 and the lower small arm mechanism 52 are fixedly connected by a small arm cross beam 53; an upper bearing end cover 511 is arranged at the right end of the upper small arm mechanism 51, and the bottom of the upper bearing end cover 511 is fixedly connected with a small arm cross beam 53; a lower bearing end cover 521 is arranged at the right end of the lower small arm mechanism 52, and the top of the lower bearing end cover 521 is fixedly connected with a small arm cross beam 53;

the upper small arm mechanism 51 comprises an upper sand mixing cylinder 512, and the lower small arm mechanism 52 comprises a lower sand mixing cylinder 522; the upper sand mixing cylinder 512 and the lower sand mixing cylinder 522 are both internally provided with a sand mixing mechanism 54;

the sand mulling mechanism 54 comprises a sand mulling rotating shaft 541, the sand mulling rotating shaft 541 in the upper sand mulling barrel 512 is rotatably connected with two ends of the upper sand mulling barrel 512, and the sand mulling rotating shaft 541 in the lower sand mulling barrel 522 is rotatably connected with two ends of the lower sand mulling barrel 522 through bearings; the end of the sand mulling rotating shaft 541 is coaxially and fixedly connected with the rotating shaft of the sand mulling motor 542, and the other end of the sand mulling rotating shaft 541 is rotatably connected with the upper bearing end cover 511 or the lower bearing end cover 521 through a bearing; a stirring cage blade 543 is arranged on the side wall of the sand mixing rotating shaft 541, and a cutter head is inlaid on the stirring cage blade 543;

wherein, the inner walls of the upper sand mixing cylinder 511 and the lower sand mixing cylinder 512 are provided with small arm lining plates made of stainless steel materials and having wear-resisting effect;

the head end of the double-small-arm mechanism 5 is provided with a small-arm sand feeding mechanism 55, and the top of the small-arm sand feeding mechanism 55 is fixedly connected with the bottom of the second driven gear 65; the small arm sand feeding mechanism 55 connects the second transition channel 66 to the lower sand mixing barrel 522, and the small arm sand feeding mechanism 55 connects the first transition channel 67 to the upper sand mixing barrel 512;

the tail ends of the upper sand mixing cylinder 512 and the lower sand mixing cylinder 522 are both provided with a sand outlet 56, and a sand outlet control mechanism 57 for controlling the opening size of the sand outlet is arranged at the sand outlet 56.

Preferably, as shown in fig. 15 to 16, the small arm sand feeding mechanism 55 includes an upper sand feeding chamber 551 communicating with the head end of the upper sand mixing barrel 512 and a lower sand feeding chamber 552 communicating with the head end of the lower sand mixing barrel 522;

one end of the upper sand inlet cavity 551 is provided with an upper round hole 5511 connected with the head end of the upper sand mixing cylinder 512, and the other end of the upper sand inlet cavity 551 is provided with an upper rotating hole 5512 rotatably connected with a sand mixing rotating shaft in the upper sand mixing cylinder 512;

one end of the lower sand inlet cavity 552 is provided with a lower round hole 5521 connected with the head end of the lower sand mixing cylinder 512, and the other end of the lower sand inlet cavity 552 is provided with a lower rotating hole 5522 rotatably connected with a sand mixing rotating shaft in the lower sand mixing cylinder 522;

the top of the small arm sand feeding mechanism 55 is provided with a middle sand feeding pipe 553 communicated with the bottom of the second transition passage 66, and the middle sand feeding pipe 553 is communicated to the lower sand feeding cavity 552 through a passage between the side wall of the small arm sand feeding mechanism 55 and the outer side wall of the upper sand feeding cavity 551;

a sand inlet channel 554 corresponding to the bottom of the first transition channel 67 is arranged around the middle sand inlet pipe 553, and the sand inlet channel 554 is communicated to the upper sand inlet cavity 551.

Preferably, the upper sand mixing cylinder 512 comprises an upper transition pipe 5121 for coaxial fixed connection with the upper circular hole 5511, an upper sand mixing main cylinder 5122 is arranged at the end of the upper transition pipe 5121, the upper sand mixing main cylinder 5122 comprises two semicircular cylinder bodies 5123, and the ends of the two semicircular cylinder bodies 5123 are hinged with the side wall of the forearm sand feeding mechanism 55;

the structure of the lower sand mixing barrel 522 is the same as that of the upper sand mixing barrel 512.

When in normal use, the two semicircular cylinders 5123 are connected together through the locking handle to form a sealed circular stirring cage; when cleaning is needed, each semicircular cylinder body is rotated along the hinged part through the hinged connection of the semicircular cylinder bodies 5123 and the small arm sand feeding mechanism 55, so that the two semicircular cylinder bodies 5123 are opened, as shown in fig. 14, and the stirring cage blades 543 can be completely exposed and are easy to clean.

Preferably, as shown in fig. 17 to 19, the sand outlet control mechanism 57 includes a sand outlet housing 571, a sand outlet control opening 572 attached to the sand outlet 56 is provided on one side of the sand outlet housing 571, and a shakeout opening 573 is provided at the bottom of the sand outlet housing 571;

a sand outlet control hydraulic cylinder 574 is fixedly arranged on the other side wall of the sand outlet shell 571, and a piston rod of the sand outlet control hydraulic cylinder 574 is fixedly connected with the sand baffle mechanism; the sand baffle mechanism comprises a sand baffle 575 capable of completely blocking the pillar sand outlet 56, a sliding block 577 which is in sliding connection with a sliding groove 576 on the side wall of a sand outlet shell 571 is arranged on the side wall of the sand baffle 575, and a connecting plate 578 which is used for connecting with a piston rod of a sand outlet control hydraulic cylinder 574 is arranged on the sliding block 577; the sand outlet control hydraulic cylinder 574 controls the size of the opening of the sand outlet 56 by controlling the sliding of the sand baffle 575 along the sliding groove 576.

Preferably, the liquid material system comprises a water glass supply system, a fast ester curing agent supply system and a slow ester curing agent supply system;

the water glass supply system is connected with an upper water glass inlet 513 on the upper sand mixing cylinder 512 and a lower water glass inlet 523 on the lower sand mixing cylinder 522;

the fast ester curing agent supply system is connected with an upper fast grease inlet 514 on the upper sand mixing cylinder 512 and a lower fast grease inlet 524 on the lower sand mixing cylinder 522;

the slow ester curing agent supply system is connected with an upper slow grease inlet 515 on the upper sand mixing barrel 512 and a lower slow grease inlet 525 on the lower sand mixing barrel 522.

The water glass supply system, the fast ester curing agent supply system and the slow ester curing agent supply system respectively comprise corresponding containing cylinders, delivery pumps, delivery pipelines and corresponding control valves, and the water glass supply system, the fast ester curing agent supply system and the slow ester curing agent supply system can be realized by adopting the prior art, so the specific structure and the composition are not described again.

The existing sand mixer is not divided into fast ester and slow ester, only one adding mode is adopted, the casting needs to be divided into two adding modes by adding the curing agent, one is a fast grease curing agent, the time of solidification after adding is accelerated, the other is a slow ester curing agent, and the time of solidification after adding is the same as that of the prior art. The setting time of the sand mold is controlled by adjusting the proportion of the fast ester curing agent and the slow ester curing agent.

A sand mixer comprises the following specific embodiments:

old sand in a sand silo is added into the first sand inlet 41 of the sand feeding mechanism 4, as shown in fig. 20, the old sand reaches the upper layer of the endless belt 352 through the first sand inlet 41, the first sand feeding pipe 43 and the first passage 341, and when the old sand is conveyed to the tail end of the upper layer of the endless belt 352, the old sand falls into the sand outlet groove 343, reaches the upper sand inlet cavity 551 through the first sand outlet passage 372, the first transition passage 67 and the sand inlet passage 554, and further enters the upper sand mixing cylinder 512 of the upper small arm mechanism 51; the used sand is mixed in the upper sand mixing cylinder 512.

Adding new sand in the sand silo into the second sand inlet 42 of the sand feeding mechanism 4, wherein as shown in fig. 20, the new sand passes through the second sand inlet 42, the second sand inlet pipe 44 and the second channel 342 to the spiral conveying cylinder 361, falls into the spiral sand outlet slot 366 when being conveyed to the tail end by the spiral conveying mechanism 36, passes through the second sand outlet channel 371, the second transition channel 66 and the intermediate feeding pipe 553 to reach the lower sand inlet cavity 552, and further enters the lower sand mixing cylinder 522 of the lower forearm mechanism 52; the fresh sand is mixed in the lower sand mixing barrel 522.

When the sand mixer is used specifically, the old sand and the new sand respectively enter the upper small arm mechanism 51 and the lower small arm mechanism 52 through different channels, so that sand adding channels, conveying channels and mixing channels of the old sand and the new sand in the sand mixer are different, the old sand and the new sand can be simultaneously added according to the requirement of a casting, the new sand and the old sand are simultaneously mixed in different small arms, and only the old sand or only the new sand can be added, so that only one sand mold is mixed; therefore, the sand mixer has the functions of adding sand to old sand and new sand simultaneously and adding sand respectively, time is saved, materials are not wasted, and production efficiency and casting quality can be improved.

When old sand is mixed in the upper sand mixing cylinder 512 or new sand is mixed in the lower sand mixing cylinder 522, firstly, the slow ester curing agent is provided through the slow ester curing agent supply system, then, the water glass and the fast ester curing agent are provided through the water glass supply system and the fast ester curing agent supply system, a certain time is set, the stirring cage blades 543 are used for fully stirring, the mixed sand is conveyed through the stirring cage blades 543, the mixed sand is discharged from the sand outlet 56 through the sand outlet control mechanism 57, and the mixed sand enters a subsequent sand box for molding.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the present invention, and it should be understood by those skilled in the art that various modifications and changes may be made without inventive efforts based on the technical solutions of the present invention.

Claims (8)

1. A sand mixer is characterized by comprising:

a base;

the top of the base is connected with the large arm mechanism through a first swing mechanism; the large arm mechanism comprises an upper chamber for conveying used sand and a lower chamber for conveying new sand;

a sand feeding mechanism is arranged at the upper part of the head end of the large arm mechanism, and a first sand feeding port communicated with the upper cavity and a second sand feeding port communicated with the lower cavity are arranged on the sand feeding mechanism;

the bottom of the tail end of the large arm mechanism is connected with the double-small arm mechanism through a second swing mechanism; the double-small-arm mechanism comprises an upper small-arm mechanism and a lower small-arm mechanism, wherein the upper small-arm mechanism and the lower small-arm mechanism are fixedly connected up and down and are used for mixing used sand and new sand; the upper small arm mechanism and the lower small arm mechanism are both connected with a liquid material system for providing adhesives and curing agents;

the tail end of the upper chamber is communicated with the upper small arm mechanism, and the tail end of the lower chamber is communicated with the lower small arm mechanism;

the first sand inlet is of a round table structure with a thick upper part and a thin lower part, a second sand inlet is fixedly arranged at the rear part of the first sand inlet, and the second sand inlet is of a semi-funnel structure;

a first sand inlet pipe communicated with the upper cavity is arranged at the bottom of the first sand inlet;

the bottom of the second sand inlet is provided with a second sand inlet pipe communicated to the lower cavity;

the side walls of the first sand inlet pipe and the second sand inlet pipe are vertically and fixedly provided with sand inlet connecting plates; the other side of the sand inlet connecting plate is fixedly connected with the sand inlet fixing plate through a sand inlet supporting frame; the sand inlet fixing plate is fixedly connected with the top of the first rotating mechanism;

the large arm mechanism comprises a large arm base, and a large arm body in a cylindrical structure is fixedly arranged at the upper part of the large arm base;

a first channel which is communicated with the first sand inlet and extends into the large arm body is arranged at the center of the upper part of the head end of the large arm body; the rear end of the upper part of the head end of the big arm body is provided with a second channel which is communicated with the second sand inlet and extends into the big arm body;

a belt conveying mechanism distributed along the length direction of the large arm body is arranged in the upper cavity inside the large arm body; the belt conveying mechanism comprises two electric rollers connected with the side wall of the large arm body, an annular belt used for conveying used sand is arranged on each electric roller, and the first channel is positioned right above the annular belt;

a spiral conveying mechanism distributed along the length direction of the large arm body is arranged in a lower cavity inside the large arm body, the spiral conveying mechanism comprises a spiral conveying cylinder body, and the second channel is communicated into the spiral conveying cylinder body;

a sand outlet mechanism is fixedly arranged at the bottom of the tail end of the large arm body and comprises a second sand outlet channel positioned in the middle, the top of the second sand outlet channel is communicated to a spiral sand outlet groove at the bottom of the tail end of the spiral conveying cylinder body, and the bottom of the second sand outlet channel is communicated to the lower small arm mechanism; the front end and the rear end of the second sand outlet channel are respectively provided with a first sand outlet channel, the top of the first sand outlet channel is communicated to the tail end of the annular belt, and the bottom of the first sand outlet channel is communicated to the upper small arm mechanism.

2. The sand mixer as claimed in claim 1, wherein the first rotating mechanism comprises a first rotating table, a first motor connecting hole and a first rotary drum connecting hole are formed in the first rotating table, a first motor is fixedly arranged in the first motor connecting hole, and a first rotary drum is rotatably connected in the first rotary drum connecting hole;

a first annular supporting plate is fixedly arranged at the top of the first rotary cylinder, and two first supporting lug plates used for being connected with the head end of the large arm mechanism are symmetrically and fixedly arranged on the first annular supporting plate; two ends of the sand inlet fixing plate are respectively fixedly connected with the two first supporting ear plates;

a first driven gear is fixedly arranged at the bottom of the first rotary drum, the first driven gear is in gear meshing connection with a first driving gear, and the first driving gear is coaxially and fixedly connected with a rotating shaft of a first motor;

the first driven gear is rotatably connected with the base at the bottom.

3. The sand mixer as claimed in claim 1, wherein the second swing mechanism comprises a second fixed plate, and two second supporting ear plates for connecting with the tail end of the large arm mechanism are symmetrically and fixedly arranged on the second fixed plate;

a second motor is arranged at the upper part of the second fixing plate, the rotating shaft of the second motor passes through the second fixing plate downwards to be coaxially and fixedly connected with a second driving gear, and the second driving gear is in gear meshing connection with a second driven gear;

the second driven gear is rotatably connected with the bottom of the first fixing plate, and the bottom of the second driven gear is fixedly connected with the double-small-arm mechanism;

and a second transition channel communicated with the second sand outlet channel is arranged in the middle of the second fixing plate, and first transition channels communicated with the first sand outlet channels are symmetrically arranged on two sides of the second transition channel.

4. A roller mill according to claim 3, wherein the upper and lower arm mechanisms are fixedly connected by an arm beam; an upper bearing end cover is arranged at the right end of the upper small arm mechanism, and the bottom of the upper bearing end cover is fixedly connected with the small arm cross beam; a lower bearing end cover is arranged at the right end of the lower small arm mechanism, and the top of the lower bearing end cover is fixedly connected with the small arm cross beam;

the upper small arm mechanism comprises an upper sand mixing barrel, and the lower small arm mechanism comprises a lower sand mixing barrel; the upper sand mixing cylinder and the lower sand mixing cylinder are both internally provided with sand mixing mechanisms;

the sand mixing mechanism comprises a sand mixing rotating shaft, the sand mixing rotating shaft in the upper sand mixing barrel is rotatably connected with two ends of the upper sand mixing barrel, and the sand mixing rotating shaft in the lower sand mixing barrel is rotatably connected with two ends of the lower sand mixing barrel through bearings; the end part of the sand mulling rotating shaft is coaxially and fixedly connected with a rotating shaft of a sand mulling motor; a stirring cage blade is arranged on the side wall of the sand mixing rotating shaft, and a cutter head is embedded in the stirring cage blade;

the head end of the double-small-arm mechanism is provided with a small-arm sand feeding mechanism, and the top of the small-arm sand feeding mechanism is fixedly connected with the bottom of the second driven gear; the small arm sand feeding mechanism is used for communicating the second transition channel to the lower sand mixing barrel, and the small arm sand feeding mechanism is used for communicating the first transition channel to the upper sand mixing barrel;

the tail ends of the upper sand mixing barrel and the lower sand mixing barrel are respectively provided with a sand outlet, and a sand outlet control mechanism for controlling the opening size of the sand outlet is arranged at the sand outlet.

5. The sand mixer as claimed in claim 4, wherein the small arm sand feeding mechanism comprises an upper sand feeding cavity communicated with the head end of the upper sand mixing barrel and a lower sand feeding cavity communicated with the head end of the lower sand mixing barrel;

one end of the upper sand inlet cavity is provided with an upper round hole connected with the head end of the upper sand mixing barrel, and the other end of the upper sand inlet cavity is provided with an upper rotating hole rotatably connected with a sand mixing rotating shaft in the upper sand mixing barrel;

one end of the lower sand inlet cavity is provided with a lower round hole connected with the head end of the lower sand mixing cylinder, and the other end of the lower sand inlet cavity is provided with a lower rotating hole rotatably connected with a sand mixing rotating shaft in the lower sand mixing cylinder;

the top of the small arm sand feeding mechanism is provided with a middle sand feeding pipe communicated with the bottom of the second transition passage, and the middle sand feeding pipe is communicated into the lower sand feeding cavity through a passage between the side wall of the small arm sand feeding mechanism and the outer side wall of the upper sand feeding cavity;

and sand inlet channels corresponding to the bottoms of the first transition channels are arranged around the middle sand inlet pipe and communicated to the upper sand inlet cavity.

6. The sand mixer as claimed in claim 4, wherein the upper sand mixing barrel comprises an upper transition pipe which is coaxially and fixedly connected with the upper round hole, an upper sand mixing main barrel is arranged at the end part of the upper transition pipe, the upper sand mixing main barrel comprises two semicircular barrels, and the end parts of the two semicircular barrels are hinged with the side wall of the small arm sand feeding mechanism;

the structure of the lower sand mixing barrel is consistent with that of the upper sand mixing barrel.

7. The sand mixer as claimed in claim 4, wherein the sand discharge control mechanism comprises a sand discharge housing, one side of the sand discharge housing is provided with a sand discharge control port which is attached to the sand discharge port, and the bottom of the sand discharge housing is provided with a shakeout port;

a sand outlet control hydraulic cylinder is fixedly arranged on the side wall of the other side of the sand outlet shell, and a piston rod of the sand outlet control hydraulic cylinder is fixedly connected with a sand baffle mechanism; the sand baffle mechanism comprises a sand baffle capable of completely blocking a sand outlet of the pillar, a sliding block which is in sliding connection with a sliding groove in the side wall of the sand outlet shell is arranged on the side wall of the sand baffle, and a connecting plate which is used for being connected with a piston rod of the sand outlet control hydraulic cylinder is arranged on the sliding block; the sand outlet control hydraulic cylinder controls the size of the opening of the sand outlet by controlling the sand baffle plate to slide along the sliding groove.

8. A roller mill according to claim 4, wherein the liquid system comprises a water glass supply system, a fast ester curing agent supply system, a slow ester curing agent supply system;

the water glass supply system is connected with an upper water glass inlet on the upper sand mixing cylinder and a lower water glass inlet on the lower sand mixing cylinder;

the quick ester curing agent supply system is connected with an upper quick grease inlet on the upper sand mixing cylinder and a lower quick grease inlet on the lower sand mixing cylinder;

and the slow ester curing agent supply system is connected with an upper slow grease inlet on the upper sand mixing cylinder and a lower slow grease inlet on the lower sand mixing cylinder.

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