CN111451438B

CN111451438B - Sand mixing device for casting machine

Info

Publication number: CN111451438B
Application number: CN202010363705.5A
Authority: CN
Inventors: 王筱冬; 牛艳君
Original assignee: Yulin University
Current assignee: Yulin University
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-07-09
Anticipated expiration: 2040-04-30
Also published as: CN111451438A

Abstract

The utility model provides a mulling device for casting machinery, includes the casing, the first motor of top side fixed mounting of casing, the top side that the lower extreme of first motor shaft passed the casing is located the upper end of casing fixed connection lead screw, the upper end fixed mounting and the first gear wheel meshing complex second pinion of vertical axis, the lower extreme fixed mounting of vertical axis can with first pinion meshing complex second gear wheel, the left side of casing is located the upside, the downside that filter plate was seted up feed inlet, discharge gate in proper order. The mechanism is simple, the conception is ingenious, the driving device of the rotary grinding disc lifting mechanism is used for driving the rotary grinding disc to rotate, the arrangement of the driving device is reduced, the equipment space is saved, the production cost of the equipment is reduced, meanwhile, the rotary grinding disc can slowly rotate in the descending process, the rotary grinding disc is prevented from being clamped by sand materials, and the rotary grinding disc automatically and quickly rotates when the sand materials are ground, so that the grinding efficiency is improved, the market demand can be met, and the device is suitable for popularization.

Description

Sand mixing device for casting machine

Technical Field

The invention belongs to the field of sand mixing devices, and particularly relates to a sand mixing device for a casting machine.

Background

The sand mixer is a device which enables all components in molding sand to be uniformly mixed and enables an adhesive to be effectively coated on the surface of sand grains, materials arranged between a grinding wheel and a grinding disc are ground under the action of grinding, the materials are mixed by the sand mixer while being ground, in the existing sand mixer, the rotary grinding disc needs a special power mechanism, the structure is complex, the rotating speed of the rotary grinding disc cannot be adjusted according to the using condition, the initial rotary grinding disc rotates too fast, the grinding effect is poor, the energy waste is caused, the rotating speed of the later rotary grinding disc is slow, the grinding efficiency is low, and the actual requirements cannot be met.

Disclosure of Invention

The invention provides a sand mixing device for a casting machine, which is used for solving the defects in the prior art.

The invention is realized by the following technical scheme:

a sand mixing device for casting machinery comprises a shell, wherein a first motor is fixedly installed on the top side of the shell, the lower end of a rotating shaft of the first motor penetrates through the top side of the shell and is located at the upper end of a lead screw fixedly connected in the shell, a nut is installed on the outer periphery of the lead screw in a threaded manner, an outer periphery bearing of the nut is connected with the inner periphery of a first annular plate, through holes which are bilaterally symmetrical are formed in the top side of the shell, first spring rods which can only move up and down are movably installed in the through holes respectively, the lower ends of the first spring rods are fixedly connected with the nut respectively, wedge-shaped blocks fixedly connected with the shell are arranged on the front side of the first spring rod on the left side and the rear side of the first spring rod on the right side respectively, the bottom side of the first annular plate is fixedly connected with the upper ends of two vertical rods, the lower ends of the vertical rods are fixedly connected, a bearing at the bottom side of the second annular plate is connected with the top side of the rotary rolling disc, a first large gear is fixedly installed at the lower end of the periphery of the lead screw, a coaxial square hole is formed at the lower end of the lead screw, a square rod only capable of moving up and down is movably installed in the square hole, a first small gear is fixedly installed at the lower end of the square rod, the bottom side of the first small gear is fixedly connected with the upper end of a coaxial connecting rod, the lower end of the connecting rod is connected with the rotary rolling disc, a vertical shaft rotatably connected with the shell is arranged at one side of the connecting rod, a second small gear meshed with the first large gear is fixedly installed at the upper end of the vertical shaft, and a second large gear meshed with the; the lower part of the rotary grinding disc is provided with a filter screen plate connected with the shell, and the left side of the shell is positioned at the upper side and the lower side of the filter screen plate and is provided with a feed inlet and a discharge outlet in sequence.

The sand mulling device for the casting machine is characterized in that the periphery of the filter screen plate is in sliding contact with the inner periphery of the shell, the bottom side of the filter screen plate is fixedly connected with the upper ends of a plurality of second spring rods, the lower ends of the second spring rods are respectively and fixedly connected with the shell, the upper part of the right side of the shell is hinged with the upper end of the rotating rod through a torsional spring, the right side of the shell is positioned at the upper side and the lower side of the filter screen plate and is respectively provided with a slot communicated with the interior of the shell, inserting rods are respectively arranged in the slots, the outer ends of the inserting rods are respectively and fixedly connected with the rotating rod, the left side of the inserting rod at the lower side is an inclined plane which, the guide surface of lower part downward sloping, the bar slot is seted up on the right side of filter plate, and in the inserted bar of downside can insert the bar slot, the one end of the right side fixed connection driving lever of second annular plate, the other end of driving lever can be followed the guide surface and slided.

According to the sand mulling device for the casting machine, the inverted cone-shaped plate fixedly connected with the shell is arranged below the filter screen plate, the rotating shaft is rotatably arranged in the preformed hole in the middle of the bottom side of the inverted cone-shaped plate, the plurality of stirring rods are fixedly arranged on the periphery of the rotating shaft, the lower end of the rotating shaft is fixedly connected with the upper end of the rotating shaft of the second motor, and the second motor is fixedly connected with the shell; the bin outlet is seted up to the left lower extreme of back taper shaped plate, and the outside of bin outlet is equipped with the baffle, and the upper end and the back taper shaped plate of baffle are articulated to be connected, and the articulated one end of connecting electric telescopic handle in the outside of baffle, electric telescopic handle's the other end and casing are articulated to be connected, and the below of bin outlet is equipped with the stock guide with casing fixed connection.

As above a mulling device for casting machinery, the back taper inboard in be equipped with pivot fixed connection's down tube, the right side of down tube is parallel with the right side of back taper inboard wall, the right side of down tube sets up the type of falling T groove of bar, the type of falling T slider of falling T inslot movable mounting type of falling T, the type of falling T slider can deviate from or be close to the axis of down tube and remove along the type of falling T groove, the surface of the type of falling T slider respectively with the inner wall sliding contact cooperation that the type of falling T groove corresponds.

In the sand mulling device for casting machine as described above, the lower part of the right side of the housing is opened.

According to the sand mixing device for the casting machine, the insertion hole is formed in the middle of the top side of the rotary grinding disc, the lower end of the connecting rod is in insertion fit with the insertion hole, the lower end of the connecting rod can only move up and down in the insertion hole, and the lower end of the connecting rod is fixedly connected with the bottom side of the insertion hole through the spring.

The invention has the advantages that: the mechanism is simple, the conception is ingenious, the driving device of the rotary grinding disc lifting mechanism is used for driving the rotary grinding disc to rotate, the arrangement of the driving device is reduced, the equipment space is saved, the production cost of the equipment is reduced, meanwhile, the rotary grinding disc can slowly rotate in the descending process, the rotary grinding disc is prevented from being clamped by sand materials, and the rotary grinding disc automatically and quickly rotates when the sand materials are ground, so that the grinding efficiency is improved, the market demand can be met, and the device is suitable for popularization. When the sand mill is used, firstly, sand materials to be mixed are poured into the top side of the filter screen plate through the feeding hole, then the first motor is electrified, the rotating shaft of the first motor drives the screw rod to rotate in the forward direction, the nut moves downwards along the screw rod, the nut drives the first spring rod to move downwards along the through hole, the nut drives the first annular plate, the vertical rod, the second annular plate and the rotary mill to move downwards, the sand materials between the rotary mill and the filter screen plate are extruded, the screw rod drives the square rod, the first pinion, the connecting rod and the rotary mill to rotate through the square hole, the rotary mill rolls the sand materials, and the rotating speed of the rotary mill is the same as that of the screw rod; the upper end of the square rod moves out of the square hole, the first pinion starts to be meshed and matched with the second gear wheel, the lead screw accelerates the vertical shaft through the first gear wheel and the second pinion, the vertical shaft accelerates the connecting rod through the second gear wheel and the first pinion, so that the connecting rod drives the rotary grinding disc to rotate rapidly, the rotating speed of the rotary grinding disc is far greater than that of the lead screw, the distance between the rotary grinding disc and the filter screen plate is short, and a good grinding effect can be achieved on sand; the upper end of the first spring rod moves out of the corresponding through hole, the nut with the first spring rod rotates along with the lead screw, the upper end of the first spring rod slides along the inclined plane of the wedge-shaped block, the first spring rod is compressed, the rotary rolling disc descends to the lowest position at the moment, the nut rotates along with the lead screw continuously, and the first spring rod is reset and extended after being compressed continuously; when the first motor rotates reversely, the upper end of the first spring rod is in contact fit with one side of the wedge-shaped block, which is opposite to the inclined plane, the first spring rod and the nut are prevented from rotating along with the screw rod, so that the nut drives the first spring rod to move upwards to reset, the first spring rod is inserted into the through hole again, the processes are carried out in reverse order, the rotary grinding disc is decelerated, grinding of sand on one side is completed, the ground sand enters the lower part of the shell through meshes of the filter screen plate, and the sand in the shell can be taken out through the discharge port.

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 description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is an enlarged view of section I of FIG. 1; FIG. 3 is an enlarged view of a portion II of FIG. 1; FIG. 4 is an enlarged view of a portion III of FIG. 1; fig. 5 is an enlarged view of the view from the direction a of fig. 2.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.

A sand mixing device for casting machinery comprises a shell 1, wherein the shell 1 is a hollow cylinder, a first motor 2 is fixedly installed on the top side of the shell 1, the lower end of a rotating shaft of the first motor 2 penetrates through the top side of the shell 1 and is located at the upper end of a lead screw 3 fixedly connected in the shell 1, a nut 4 is installed on the outer periphery of the lead screw 3 in a threaded mode, an outer peripheral bearing of the nut 4 is connected with the inner periphery of a first annular plate 5, through holes 6 which are bilaterally symmetrical are formed in the top side of the shell 1, first spring rods 7 which can only move up and down are movably installed in the through holes 6 respectively, the lower ends of the first spring rods 7 are fixedly connected with the nut 4 respectively, wedge-shaped blocks 8 fixedly connected with the shell 1 are arranged on the front side of the first spring rod 7 on the left side and the rear side of the first spring rod 7 on the right side respectively, the upper ends of the first spring rods 7 can slide along the inclined planes of the wedge-shaped blocks 8 respectively, the lower end of a vertical rod 9 is fixedly connected with a same second annular plate 10, the periphery of the vertical rod 9 is respectively sleeved with a sliding sleeve 11 which can only move up and down, the sliding sleeve 11 is respectively fixedly connected with a shell 1, the bottom side bearing of the second annular plate 10 is connected with the top side of a rotary grinding disc 12, the lower end of the periphery of a lead screw 3 is fixedly provided with a first large gear 14, the lower end of the lead screw 3 is provided with a coaxial square hole 15, a square rod 16 which can only move up and down is movably arranged in the square hole 15, the lower end of the square rod 16 is fixedly provided with a first small gear 17, the bottom side of the first small gear 17 is fixedly connected with the upper end of a coaxial connecting rod 18, the lower end of the connecting rod 18 is connected with the rotary grinding disc 12, one side of the connecting rod 18 is provided with a vertical shaft 19 which is rotatably connected with the shell 1 through a shaft seat, the upper, a second large gear 21 which can be meshed and matched with the first small gear 17 is fixedly arranged at the lower end of the vertical shaft 19; a filter screen plate 22 connected with the shell 1 is arranged below the rotary grinding disc 12, and a feed inlet 24 and a discharge outlet 25 are sequentially arranged on the upper side and the lower side of the filter screen plate 22 on the left side of the shell 1. The mechanism is simple, the conception is ingenious, the driving device of the rotary grinding disc lifting mechanism is used for driving the rotary grinding disc to rotate, the arrangement of the driving device is reduced, the equipment space is saved, the production cost of the equipment is reduced, meanwhile, the rotary grinding disc can slowly rotate in the descending process, the rotary grinding disc is prevented from being clamped by sand materials, and the rotary grinding disc automatically and quickly rotates when the sand materials are ground, so that the grinding efficiency is improved, the market demand can be met, and the device is suitable for popularization. When the sand grinding device is used, firstly, sand materials to be mixed are poured into the top side of the filter screen plate 22 through the feeding hole 24, then the first motor 2 is electrified, the rotating shaft of the first motor 2 drives the screw rod 3 to rotate in the forward direction, the nut 4 moves downwards along the screw rod 3, the nut 4 drives the first spring rod 7 to move downwards along the through hole 6, meanwhile, the nut 4 drives the first annular plate 5, the vertical rod 9, the second annular plate 10 and the rotary grinding disc 12 to move downwards, the sand materials between the rotary grinding disc 12 and the filter screen plate 22 are extruded, meanwhile, the screw rod 3 drives the square rod 16, the first pinion 17, the connecting rod 18 and the rotary grinding disc 12 to rotate through the square hole 15, the rotary grinding disc 12 rolls the sand materials, and at the moment, the rotating speed of the rotary grinding disc 12 is the same as that of the screw rod 3; the upper end of the square rod 16 is moved out of the square hole 15, the first pinion 17 is meshed with the second gearwheel 21, the lead screw 3 accelerates the vertical shaft 19 through the first gearwheel 14 and the second pinion 20, the vertical shaft 19 accelerates the connecting rod 18 through the second gearwheel 21 and the first pinion 17, so that the connecting rod 18 drives the rotary grinding disc 12 to rotate rapidly, the rotating speed of the rotary grinding disc 12 is far greater than that of the lead screw 3, the distance between the rotary grinding disc 12 and the filter screen plate 22 is short, and a good grinding effect can be formed on sand; until the upper end of the first spring rod 7 moves out of the corresponding through hole 6, the nut 4 with the first spring rod 7 rotates along with the screw rod 3, the upper end of the first spring rod 7 slides along the inclined plane of the wedge-shaped block 8, the first spring rod 7 is compressed, the rotary rolling disc 9 descends to the lowest position at the moment, the nut 4 rotates along with the screw rod 3 continuously, and the first spring rod 7 is reset and extended after being compressed continuously; when the first motor 2 rotates reversely, the upper end of the first spring rod 7 is in contact fit with the side, opposite to the inclined surface of the wedge-shaped block 8, to prevent the first spring rod 7 and the nut 4 from rotating along with the screw rod 3, so that the nut 4 drives the first spring rod 7 to move upwards and reset, the first spring rod 7 is inserted into the through hole 6 again, the processes are carried out in reverse order, the rotary grinding disc 12 is decelerated, grinding of one side of sand material is completed, the ground sand material enters the lower part of the shell 1 through the meshes of the filter screen plate 22, and the sand material in the shell 1 can be taken out through the discharge port 25.

Specifically, as shown in the figure, the outer periphery of the filter screen plate 22 described in this embodiment is in sliding contact with the inner periphery of the housing 1, the bottom side of the filter screen plate 22 is fixedly connected to the upper ends of a plurality of second spring rods 23, the lower ends of the second spring rods 23 are respectively fixedly connected to the housing 1, the upper portion of the right side of the housing 1 is hinged to the upper end of the rotating rod 30 through a torsion spring, the right side of the housing 1, which is located at the upper and lower sides of the filter screen plate 22, is respectively provided with slots 31 communicating with the inside of the housing 1, the slots 31 are respectively provided with insertion rods 32, the outer ends of the insertion rods 32 are respectively fixedly connected to the rotating rod 30, the left side of the insertion rod 32 at the lower side is an upward inclined plane, the left side of the insertion rod 32 at the upper side is a guide plane with an upward inclined upper portion and a downward inclined portion, the right side of the filter, the other end of the shift lever 34 is slidable along the guide surface. When the shift lever 34 moves downward along with the second annular plate 10, the other end of the shift lever 34 slides along the upward inclined surface of the guide surface to generate outward thrust on the insertion rod 32 on the upper side, the rotating rod 30 rotates counterclockwise along the hinge shaft with the housing 1, the torsion spring starts to store energy until the shift lever 34 is separated from the insertion rod 32 on the upper side, the rotating rod 30 rotates clockwise under the action of the torsion spring to reset, and similarly, when the shift lever 34 moves upward, the other end of the shift lever 34 slides along the downward inclined surface of the guide surface, and the rotating rod 30 rotates clockwise to reset after rotating counterclockwise; when the rotary rolling disc 12 generates downward pressure on the filter screen plate 22, the filter screen plate 22 moves downward, the second spring rod 23 is compressed, the bottom side of the filter screen plate 22 slides along the inclined plane at the left end of the lower insertion rod 32, outward thrust is generated on the lower insertion rod 32, the rotating rod 30 rotates counterclockwise, the torsion spring stores energy, the torsion spring moves downward continuously along with the filter screen plate 22, the left end of the lower insertion rod 32 can enter the strip-shaped slot 33 under the action of the torsion spring, when the rotary rolling disc 12 moves upward, the bottom side of the lower insertion rod 32 is in contact fit with the bottom side of the strip-shaped slot 33, the filter screen plate 22 can be prevented from moving upward and resetting, the deflector rod 34 can push the upper insertion rod 32 outwards at the moment, the lower insertion rod 32 moves out in the strip-shaped slot 33, the limit on the filter screen plate 22 is released, and the filter screen plate 22 drives the second spring rod 23 to rapidly lift up and reset under the action of, the sand adhered to the top side of the filter screen plate 22 can be thrown away by inertia, and vibration is generated to shake off the sand in the mesh holes of the filter screen plate 22, so that the filter screen plate 22 is automatically cleaned, and the good filtering function of the filter screen plate 22 is kept.

Specifically, as shown in the figure, an inverted conical plate 40 fixedly connected with the casing 1 is arranged below the filter screen plate 22 in this embodiment, a rotating shaft 41 is rotatably mounted in a preformed hole in the middle of the bottom side of the inverted conical plate 40, a plurality of stirring rods 42 are fixedly mounted on the periphery of the rotating shaft 41, the lower end of the rotating shaft 41 is fixedly connected with the upper end of a rotating shaft of a second motor 43, and the second motor 43 is fixedly connected with the casing 1; discharge gate 44 is seted up to the left lower extreme of back taper plate 40, and the outside of discharge gate 44 is equipped with baffle 45, and the upper end of baffle 45 is connected with back taper plate 40 is articulated, and the articulated one end of connecting electric telescopic handle 46 in the outside of baffle 45, and electric telescopic handle 46's the other end is connected with casing 1 is articulated, and the below of discharge gate 44 is equipped with the stock guide 47 with casing 1 fixed connection. The sand material that filter plate 22 fell gets into the back taper plate 40 in, for second motor 43 circular telegram, second motor 43 drives pivot 41, puddler 42 and rotates to stir the sand material in the back taper plate 40 and mix, can make baffle 45 confined bin outlet 44 seal or open through electric telescopic handle 46 is flexible, after opening bin outlet 44, the sand material in the back taper plate 40 falls on guide plate 47 through bin outlet 44, and discharges casing 1 through discharge gate 25.

Further, as shown in the figure, an inclined rod 50 fixedly connected with the rotating shaft 41 is arranged in the inverted-cone-shaped plate 40, the right side of the inclined rod 50 is parallel to the right side of the inner wall of the inverted-cone-shaped plate 40, a strip-shaped inverted-T-shaped groove 51 is formed in the right side of the inclined rod 50, an inverted-T-shaped slider 52 is movably mounted in the inverted-T-shaped groove 51, the inverted-T-shaped slider 52 can move along the inverted-T-shaped groove 51 away from or close to the axis of the inclined rod 50, and the surface of the inverted-T-shaped slider 52 is in sliding contact fit with the inner wall corresponding to. When stirring sand material, the type of falling T slider 52 contracts into the type of falling T groove 51 under the resistance effect of sand material, down tube 50 can act as the puddler this moment, down tube 50 can pulverize great board caking with the cooperation of the interior wall of the tapered plate 40 simultaneously, when the sand material in the tapered plate 40 is less, the type of falling T slider 52 outer end shifts out the type of falling T groove 51 under the effect of centrifugal force, the outside of the type of falling T slider 52 cooperates with the interior wall sliding contact of the tapered plate 40, can scrape the sand material of the interior wall adhesion of the tapered plate 40, thereby realize the clearance to the interior wall of the tapered plate 40.

Further, as shown in the figure, the lower portion of the right side of the housing 1 according to the present embodiment is opened. The second motor 43 is facilitated to radiate heat, and the maintenance of the second motor 43 is facilitated through the opening.

Furthermore, as shown in the drawings, the middle of the top side of the rotary rolling stand 12 according to the embodiment is provided with an insertion hole 60, the lower end of the connecting rod 18 is in insertion fit with the insertion hole 60, the lower end of the connecting rod 18 can only move up and down in the insertion hole 60, and the lower end of the connecting rod 18 is fixedly connected with the bottom side of the insertion hole 60 through a spring 61. When the square bar 16 is misaligned with the square hole 15, the spring 61 is compressed until the square bar 16 is aligned with the square hole 15, the square bar 16 is inserted into the square hole 15, the spring 61 is reset, and when the teeth of the first small gear 17 and the teeth of the second large gear 21 are misaligned, the spring 61 can be stretched.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A sand mixing device for foundry machinery, characterized in that it comprises a casing (1), a first motor (2) is fixedly installed on the top side of the casing (1), and the lower end of the rotating shaft of the first motor (2) The top side of the housing (1) is located in the housing (1) and the upper end of the lead screw (3) is fixedly connected. The outer peripheral thread of the lead screw (3) installs the nut (4), and the outer peripheral bearing of the nut (4) Connecting the inner circumference of the first annular plate (5), the top side of the housing (1) is provided with a left-right symmetrical through hole (6), and a first spring rod (7) that can only move up and down is movably installed in the through hole (6). ), the lower ends of the first spring rod (7) are respectively fixedly connected with the nut (4), the front side of the first spring rod (7) on the left side and the rear side of the first spring rod (7) on the right side are respectively set There is a wedge block (8) fixedly connected with the housing (1), the bottom side of the first annular plate (5) is fixedly connected to the upper ends of the two vertical rods (9), and the lower ends of the vertical rods (9) are fixedly connected to the same one In the second annular plate (10), the outer circumference of the vertical rod (9) is respectively fitted with sliding sleeves (11) that can only move up and down, and the sliding sleeves (11) are respectively fixedly connected with the casing (1). The second annular plate (10) The bottom side bearing is connected to the top side of the rotary mill plate (12), the lower end of the outer periphery of the lead screw (3) is fixedly installed with the first large gear (14), and the lower end of the lead screw (3) is provided with a coaxial square hole (15). A square rod (16) that can only move up and down is movably installed in the hole (15), the lower end of the square rod (16) is fixedly installed with the first pinion (17), and the bottom side of the first pinion (17) is fixedly connected to the coaxial The upper end of the connecting rod (18) and the lower end of the connecting rod (18) are connected with the rotating disc (12). One side of the connecting rod (18) is provided with a vertical shaft (19) rotatably connected with the casing (1). The upper end of the shaft (19) is fixedly installed with a second pinion gear (20) that meshes with the first large gear (14), and the lower end of the vertical shaft (19) is fixedly installed with a second pinion gear (17) that meshes and cooperates with the first pinion gear (17). A large gear (21); a filter screen plate (22) connected to the casing (1) is arranged below the rotary mill plate (12), and the left side of the casing (1) is located on the upper side of the filter screen plate (22), A material inlet (24) and a material outlet (25) are opened in sequence on the lower side.

2. A sand mixing device for a foundry machine according to claim 1, characterized in that: the outer circumference of the filter screen plate (22) is in sliding contact with the inner circumference of the housing (1), and the filter screen The bottom side of the plate (22) is fixedly connected to the upper ends of several second spring rods (23), the lower ends of the second spring rods (23) are respectively fixedly connected to the casing (1), and the upper part of the right side of the casing (1) passes through The torsion spring is hingedly connected to the upper end of the rotating rod (30), and the right side of the housing (1) is located on the upper and lower sides of the filter screen plate (22) and respectively defines a slot (31) that communicates with the inside of the housing (1). 31) are respectively provided with insertion rods (32), the outer ends of the insertion rods (32) are respectively fixedly connected with the rotating rod (30), the left side of the lower insertion rod (32) is an upwardly inclined slope, and the upper The left side of the insertion rod (32) is a guide surface whose upper part is inclined upward and the lower part is inclined downward. The right side of the filter screen plate (22) is provided with a strip slot (33), and the insertion rod (32) on the lower side can be inserted into the strip. In the slot (33), the right side of the second annular plate (10) is fixedly connected to one end of the lever (34), and the other end of the lever (34) can slide along the guide surface.

3. A sand mixing device for a foundry machine according to claim 1, characterized in that: an inverted conical plate fixedly connected to the casing (1) is provided below the filter screen plate (22). (40), the rotating shaft (41) is rotated and installed in the reserved hole in the middle of the bottom side of the inverted conical plate (40), several stirring rods (42) are fixedly installed on the outer circumference of the rotating shaft (41), and the lower end of the rotating shaft (41) is fixedly connected The upper end of the rotating shaft of the second motor (43) is fixedly connected to the housing (1); the lower end of the left side of the inverted conical plate (40) is provided with a discharge port (44), and the discharge port (44) The outer side is provided with a baffle (45), the upper end of the baffle (45) is hingedly connected with the inverted conical plate (40), and the outer side of the baffle (45) is hingedly connected to one end of the electric telescopic rod (46), the electric telescopic rod ( The other end of 46) is hingedly connected with the casing (1), and a material guide plate (47) fixedly connected with the casing (1) is arranged below the discharge port (44).

4. A sand mixing device for foundry machinery according to claim 3, characterized in that: the inverted conical plate (40) is provided with an inclined rod (50) fixedly connected to the rotating shaft (41) , the right side of the oblique rod (50) is parallel to the right side of the inner wall of the inverted conical plate (40), the right side of the oblique rod (50) is provided with a strip-shaped inverted T-slot (51), and the inverted T-slot (51) The inverted T-shaped sliding block (52) is movably installed inside, and the inverted T-shaped sliding block (52) can move away from or close to the axis of the inclined rod (50) along the inverted T-shaped groove (51). The surfaces are respectively in sliding contact with the corresponding inner walls of the inverted T-shaped grooves (51).

5 . The sand mixing device for foundry machinery according to claim 3 , wherein an opening is provided in the lower part of the right side of the casing ( 1 ). 6 .

6. A sand mixing device for a foundry machine according to claim 1, characterized in that: an insertion hole (60) is provided in the middle of the top side of the rotating disc (12), and the lower end of the connecting rod (18) The lower end of the connecting rod (18) can only move up and down in the jacking hole (60), and the lower end of the connecting rod (18) and the bottom side of the jacking hole (60) pass through the spring (61) ) fixed connection.