阅读说明：本技术 一种覆膜砂注入铸造砂箱内的方法 (Method for injecting precoated sand into casting sand box ) 是由 吴文国 于 2020-04-22 设计创作，主要内容包括：本发明涉及一种覆膜砂注入铸造砂箱内的方法,包括覆膜砂导出的步骤,覆膜砂导出机构的出口设置有覆膜砂布料机构,且实施对覆膜砂均匀布料的步骤,所述布料机构出口使得覆膜砂导出机构导出的覆膜砂呈现矩形状态的导出面,所述布料机构的出口下方设置有除尘机构,所述除尘机构用于将布料机构出口位置的灰尘导出,该方可以实现对覆膜砂的均匀布料,方便后续覆膜砂能够均匀的覆盖在铸造砂箱内,并且利用除尘机构实施对覆膜砂布料机构导出口产生的扬尘快速抽出,从而确保作业空间的清洁,方便作业人员操作。(The invention relates to a method for injecting precoated sand into a casting sand box, which comprises a step of guiding out the precoated sand, wherein a precoated sand distributing mechanism is arranged at an outlet of a precoated sand guiding mechanism, and the step of uniformly distributing the precoated sand is implemented, the outlet of the distributing mechanism enables the precoated sand guided out by the precoated sand guiding mechanism to be in a rectangular guiding surface, a dust removing mechanism is arranged below the outlet of the distributing mechanism and used for guiding out dust at the outlet position of the distributing mechanism, so that the precoated sand can be uniformly distributed, subsequent precoated sand can be uniformly covered in the casting sand box conveniently, and the dust removing mechanism is used for rapidly extracting dust generated at the guiding outlet of the precoated sand distributing mechanism, so that the cleanness of an operation space is ensured, and the operation of an operator is facilitated.)

1. The method for injecting the precoated sand into the casting sand box is characterized by comprising the following steps: the method for injecting the precoated sand into the casting sand box comprises the following characteristics:

firstly, guiding precoated sand into a material storage tank (11) of a precoated sand guiding mechanism (10), starting a material guiding screw rod (13), guiding the precoated sand out from an outlet of a material guiding pipe (12), and guiding the precoated sand into a sliding pipe (14);

secondly, starting a material pushing mechanism, guiding the precoated sand in the sliding pipe (14) to the position of an upper-end pipe orifice of a material distribution pipe (21) of a material distribution mechanism (20), uniformly distributing the precoated sand in a material distribution channel (23) between the material distribution pipe (21) and a material distribution taper sleeve (22), and guiding the precoated sand out of a lower-end outlet of the material distribution channel (23) to realize the material distribution of the precoated sand along the length direction of the casting sand box;

thirdly, the lower end of the distributing channel (23) is led out to a bulk material inclined plate (22), so that the precoated sand is led out from the bulk material inclined plate (22) to a position above a material separating sieve (251) of a distributing sieve plate (25);

fourthly, the electric cylinder (28) is started, so that the driving slide block (27) vertically moves, the adjustment of the included angle between the material distribution sieves (251) and the spreading sieve (252) is realized, and the length of the material distribution sieve plate (25) is arranged according to the width direction of the casting sand box;

fifthly, the material blocking grid plate (261) is driven to rotate through the driving slide block (27) so as to adjust the included angle between the material blocking grid plate (261) and the material blocking groove (263) and adjust the conduction amount of the precoated sand passing through the material separating sieve (251) and the expanding sieve (252);

sixthly, starting a dust removal mechanism (30) to realize dust removal operation of raised dust in the dust removal cover (31);

seventhly, the poke rod (43) is manually pulled, so that the material distribution mechanism (20) and the dust removal mechanism (30) slide along the length direction of the casting sand box, and the sand coating operation in the casting sand box is realized until the coated sand is uniformly covered in the casting sand box;

and eighthly, after the precoated sand is located in the casting sand box, vibrating the casting sand box to uniformly cover the precoated sand in the casting sand box, and finishing the injection operation of the precoated sand.

2. The method of injecting precoated sand into a casting flask according to claim 1, wherein: tectorial membrane sand guiding mechanism (10) are including holding material jar (11), the lower extreme of holding material jar (11) is provided with the export, the export is provided with passage (12), be provided with guide hob (13) in passage (12), actuating mechanism drive guide hob (13) rotate, the mouth of pipe of passage (12) is provided with sliding tube (14), sliding tube (14) constitute sliding fit along passage (12), be provided with pushing equipment in sliding tube (14), pushing equipment releases the tectorial membrane sand in sliding tube (14) from the mouth of pipe.

3. The method of injecting precoated sand into a casting flask according to claim 2, wherein: the whole right angle tubular structure that is of slip pipe (14), the one end and passage (12) of slip pipe (14) constitute the cooperation of pegging graft, pushing equipment pushes away material hob (141) including setting up in the lumen of the other end of slip pipe (14), it arranges along passage (12) length direction to push away material hob (141), the mouth of pipe of slip pipe (14) constitutes the discharge gate.

4. The method of injecting precoated sand into a casting flask according to claim 3, wherein: the distributing mechanism (20) comprises a distributing pipe (21), the distributing pipe (21) is vertically arranged, the upper end of the distributing pipe (21) is arranged below a discharge hole of the sliding pipe (14), a distributing taper sleeve (22) is arranged in the distributing pipe (21), the distributing taper sleeve (22) is arranged in a small-upper mode and a large-lower mode, the profile of the distributing pipe (21) is matched with the profile of the distributing taper sleeve (22), a gap between the distributing pipe (21) and the distributing taper sleeve (22) forms a distributing channel (23) for precoated sand, and the whole section of the distributing channel (23) is arc-shaped; cloth taper sleeve (22) wholly is the semicircle cone structure of cutting open, cloth pipe (21) are cut open by half by die department, the both sides wall of cloth pipe (21) is connected with the both sides of cloth taper sleeve (22), the upper end of cloth pipe (21) is provided with feeding horn mouth (211), feeding horn mouth (211) are connected as an organic wholely with the mouth of pipe of sliding tube (14).

5. The method of injecting precoated sand into a casting flask according to claim 4, wherein: the outer wall of the cloth taper sleeve (22) is provided with cloth partition plates (221), one end face of each cloth partition plate (221) is arranged along the bus direction of the cloth taper sleeve (22), the other side of each cloth partition plate (221) is close to the inner wall of the cloth pipe (21), a plurality of cloth partition plates (221) are arranged at intervals along the circumferential direction of the cloth taper sleeve (22), and adjacent cloth partition plates (221) form a channel for guiding the precoated sand; the lower end of the material distribution channel (23) is provided with a material distribution inclined plate (24), a material distribution sieve plate (25) is arranged below the material distribution inclined plate (24), and the width direction of the material distribution sieve plate (25) positioned in the casting sand box is adjustable.

6. The method of injecting precoated sand into a casting flask according to claim 5, wherein: the distributing sieve plate (25) comprises a distributing sieve (251) and an unfolding sieve (252), the distributing sieve (251) is integrally V-shaped, the middle position of the distributing sieve (251) is hinged, the unfolding sieve (252) is arranged on two sides of the distributing sieve (251), one end of the unfolding sieve (252) is hinged to one end of the distributing sieve (251), the unfolding sieve (252) is parallel to and horizontally arranged with a hinged shaft of the distributing sieve (251), the unfolding mechanism drives the distributing sieve (251) to rotate around the hinged shaft, the unfolding sieve (252) rotates around the hinged shaft, an included angle between the unfolding sieve (252) and the distributing sieve (251) is adjustable, and an included angle between the distributing sieve (251) is adjustable.

7. The method of injecting precoated sand into a casting flask according to claim 6, wherein: a material blocking grid (26) is arranged below the material separating screen (251) and on the lower plate surface of the expanding screen (252), the material blocking grid (26) comprises a plurality of material blocking grid plates (261), the material blocking grid plates (261) are arranged along the length directions of the lower plate surfaces of the material separating screen (251) and the expanding screen (252), two ends of each material blocking grid plate (261) are respectively hinged to the frame (262), hinged shafts at two ends of each material blocking grid plate (261) are parallel to the length directions of the material separating screen (251) and the expanding screen (252), and the adjusting mechanism is used for adjusting included angles among the material blocking grid plates (261), the material separating screen (251) and the expanding screen (252); keep off material grid (26) still including keeping off silo (263), keep off silo (263) and divide the parallel of material sieve (251) and expansion sieve (252) and arrange along the lower plate face of branch material sieve (251) and expansion sieve (252) respectively, keep off material grid plate (261) and set up in the notch that sets up in keeping off silo (263), keep off the both ends of material grid plate (261) respectively the rotary type setting in keeping off silo (263) both ends notch position.

8. The method of injecting precoated sand into a casting flask according to claim 7, wherein: the adjusting mechanism comprises a support plate (2611) connected with a hinged shaft at one end of a material blocking grid plate (261), the support plate (2611) and the hinged shaft of the material blocking grid plate (261) are arranged vertically, a sliding hole (26111) is formed in the support plate (2611), a sliding hole (26111) is arranged along the length direction of the support plate (2611), connecting rods (2612) are arranged in the sliding holes (26111), a sliding rod is arranged at one end of each connecting rod (2612), the sliding rods are arranged in the sliding holes (26111) in a sliding mode, the other end of each connecting rod (2612) and an adjusting sliding rod (2613) form hinged connection, the hinged shafts at two ends of each connecting rod (2612) and the hinged shaft of the material blocking grid plate (261) are arranged in parallel, and a driving unit drives the adjusting sliding rod (2613) to move;

the driving unit comprises a driving rod (2614) hinged with one end of an adjusting sliding rod (2613), the other end of the driving rod (2614) is hinged with a driving slider (27), driving shafts at two ends of the driving rod (2614) are horizontal and are arranged perpendicular to the driving rod (2614), the driving slider (27) moves vertically, the upper end of the driving slider is connected with a piston rod of an electric cylinder (28), two first driving connecting rods (271) are hinged on the driving slider (27), and the two first driving connecting rods (271) are hinged with the material separating sieve (251) respectively;

the adjusting slide rod (2613) comprises a drive tube (26131), a slide rod (26132) is arranged in the drive tube (26131) in a sliding mode, a spring (26133) is arranged in the drive tube (26131), two ends of the spring (26133) are respectively abutted against the drive tube (26131) and the slide rod (26132), and the rod end of the slide rod (26132) is hinged to a drive rod (2614);

second driving connecting rods (272) are further arranged below the two first driving connecting rods (271) respectively, one ends of the two second driving connecting rods (272) are hinged with the driving sliding block (27) respectively, and the other ends of the two second driving connecting rods (272) are hinged with the unfolding screen (252) respectively;

a material receiving chute (51) is arranged below the lower end of the expanded screen (252), a material receiving groove (52) is arranged at the lower end of the material receiving chute (51), a material guide mechanism is arranged at the bottom of the material receiving groove (52), and the material guide mechanism guides the precoated sand in the material receiving groove (52) out of the material distribution pipe (21).

9. The method of injecting precoated sand into a casting flask according to claim 8, wherein: the dust removal mechanism (30) comprises a dust removal cover (31) arranged around the periphery of the cloth sieve plate (25), a dust removal exhaust pipe (32) is arranged above the dust removal cover (31), the dust removal exhaust pipe (32) is communicated with an air inlet of a dust remover (33), and an air outlet of the dust remover (33) is communicated with an air inlet of an exhaust fan (34); the dust remover (33) comprises first and second chambers (331, 332), the first and second chambers (331, 332) are arranged in the vertical direction, a shaking plate (333) is arranged between the first and second chambers (331, 332), a dust removal cloth bag (334) is arranged between the first and second chambers (331, 332), an opening of the dust removal cloth bag (334) faces downwards and is communicated with the second chamber (332), the upper end of the dust removal cloth bag (334) is closed and extends into the first chamber (331), a shaking rod (335) is arranged in the first chamber (331), the closed end of the upper end of the dust removal cloth bag (334) is bound on the shaking rod (335), the shaking rod (335) is connected with a vibration mechanism, and the vibration mechanism drives the shaking rod (335) to reciprocate in the horizontal direction;

the upper plate surface and the lower plate surface of the shaking plate (333) are respectively provided with a connecting pipe (3331), the dust removal cloth bag (334) comprises two sections, the lower end opening of the dust removal cloth bag (334) in the first chamber (331) is fixed with the connecting pipe (3331), the upper end opening of the dust removal cloth bag (334) in the second chamber (332) is fixed with the connecting pipe (3331), and the lower end opening of the dust removal cloth bag (334) is provided with a counterweight ring (3341);

the utility model discloses a vibrating mechanism, including shaking pole (335), shaking pole (335) slip and setting up on the tank wall at first chamber (331) place, the rod end of shaking pole (335) stretches out first chamber (331) and is provided with and supports and lean on gyro wheel (3311), the pole body that the shaking pole (335) stretched out first chamber (331) is gone up the cover and is equipped with and supports and lean on spring (3312), support and lean on the both ends of spring (3312) respectively with support and lean on the tank wall of gyro wheel (3311) and first chamber (331) to support and lean on, the outer end side of shaking pole (335) is provided with vibration gyro wheel (336), the rim of vibration gyro wheel (336) supports with the rim that supports gyro wheel (3311) and supports and support, vibration gyro wheel (336) are connected with the pivot of vibrating motor (337), the pivot and vibration gyro wheel (336) eccentric.

10. The method of injecting precoated sand into a casting flask according to claim 9, wherein: slide tube (14) cover is established at passage (12) outer wall, horizontal migration mechanism (40) contain horizontal track (41) that set up at passage (12) outer wall, horizontal track (41) are arranged with passage (12) length direction, be provided with on slide tube (14) and remove gyro wheel (42), remove gyro wheel (42) wheel core level and perpendicular with slide tube (14) length direction, it rolls and sets up on horizontal track (41) to remove gyro wheel (42), the outer wall extension of dust excluding hood (31) is provided with poker rod (43).

Technical Field

The invention relates to the technical field of casting, in particular to a method for injecting precoated sand into a casting sand box.

Background

In a common production method of sand casting as a general structural component, used precoated sand needs to be recycled, when the precoated sand is recycled, a casting sand box is placed in a casting mold, then the precoated sand needs to be poured into the casting sand box, after the precoated sand is poured, a pouring opening needs to be placed at the upper end of the mold, when a component is produced by vacuum casting, the casting sand box needs to be vacuumized, molten metal is poured into a pouring gate, after cooling, the casting sand box is removed, a blank casting can be obtained, the precoated sand is introduced into the casting sand box through a pipeline, when the precoated sand is introduced, a large amount of dust is generated, so that the operation space is extremely bad, when the precoated sand is introduced into the casting sand box through the pipeline, the covering of the precoated sand is extremely uneven, and after the precoated sand is introduced into the casting sand box, the precoated sand in the casting sand box needs to be stirred uniformly by manpower, to complete the operation of covering the precoated sand, the prior art precoated sand has a significant technical problem when actually introduced into a casting flask.

Disclosure of Invention

The invention aims to provide a method for injecting precoated sand into a casting sand box, which can effectively avoid the problem of dust emission generated during the introduction of the precoated sand and can effectively and uniformly cover the precoated sand in the casting sand box.

The technical scheme adopted by the invention is as follows.

The method for injecting the precoated sand into the casting sand box comprises the following characteristics:

firstly, guiding precoated sand into a material storage tank of a precoated sand guiding mechanism, starting a material guiding screw rod, guiding the precoated sand out from an outlet of a material guiding pipe, and guiding the precoated sand into a sliding pipe;

secondly, starting a material pushing mechanism, guiding the precoated sand in the sliding pipe to the position of an upper-end pipe orifice of a distribution pipe of a distribution mechanism, uniformly distributing the precoated sand in a distribution channel between the distribution pipe and a distribution taper sleeve, and guiding the precoated sand out of a lower-end outlet of the distribution channel to realize the distribution of the precoated sand along the length direction of the casting sand box;

thirdly, leading out the lower end of the distribution channel to a bulk material inclined plate, and leading out the precoated sand to a position above a material separating sieve of the distribution sieve plate from the bulk material inclined plate;

fourthly, the electric cylinder is started, so that the driving slide block vertically moves, the adjustment of the included angle between the material distribution sieves and the expansion sieves is realized, and the length of the material distribution sieve plate is arranged according to the width direction of the casting sand box;

fifthly, the driving slide block is linked with the material blocking grid plate to rotate so as to adjust the included angle between the material blocking grid plate and the material blocking groove and adjust the conduction amount of the precoated sand passing through the material separating sieve and the expanding sieve;

sixthly, starting a dust removal mechanism to realize dust removal operation of raised dust in the dust removal cover;

seventhly, manually pulling the poke rod to enable the material distribution mechanism and the dust removal mechanism to slide along the length direction of the casting sand box so as to realize the sand coating operation in the casting sand box until the coated sand is uniformly covered in the casting sand box;

and eighthly, after the precoated sand is located in the casting sand box, vibrating the casting sand box to uniformly cover the precoated sand in the casting sand box, and finishing the injection operation of the precoated sand.

The invention also has the following features:

tectorial membrane sand guiding mechanism is including depositing the material jar, the lower extreme of depositing the material jar is provided with the export, the export is provided with the passage, be provided with the guide hob in the passage, actuating mechanism drive guide hob rotates, the mouth of pipe of passage is provided with the slip pipe, the slip pipe constitutes sliding fit along the passage, be provided with pushing equipment in the slip pipe, pushing equipment releases the tectorial membrane sand in the slip pipe from the mouth of pipe.

The whole right angle tubular structure that is of slip pipe, the one end of slip pipe constitutes the cooperation of pegging graft with the passage, pushing equipment pushes away the material hob including setting up in the pipe cavity of slip pipe other end, it arranges along passage length direction to push away the material hob, the mouth of pipe of slip pipe constitutes the discharge gate.

The distributing mechanism comprises a distributing pipe, the distributing pipe is vertically arranged, the upper end of the distributing pipe is arranged below a discharge port of the sliding pipe, a distributing taper sleeve is arranged in the distributing pipe, the distributing taper sleeve is arranged in a small mode and arranged in a large mode, the profile of the distributing pipe is matched with the profile of the distributing taper sleeve, a gap between the distributing pipe and the distributing taper sleeve forms a distributing channel of precoated sand, and the section of the distributing channel is integrally arc-shaped.

The whole semicircle cone structure of cutting open that is of cloth taper sleeve, the distributing pipe is cut open half and half by die department, the both sides wall and the both sides of cloth taper sleeve of distributing pipe are connected, the upper end of distributing pipe is provided with the feeding horn mouth, the feeding horn mouth is connected as an organic wholely with the mouth of pipe of sliding tube.

The outer wall of cloth taper sleeve is provided with the cloth baffle, cloth baffle one side terminal surface arranges along the generating line direction of cloth taper sleeve, the opposite side of cloth baffle is close to with the inner wall of cloth pipe, the cloth baffle sets up a plurality ofly along the circumference direction interval of cloth taper sleeve, and adjacent cloth baffle constitutes the passageway that the tectorial membrane sand was derived.

The lower end of the material distribution channel is provided with a material distribution inclined plate, a material distribution sieve plate is arranged below the material distribution inclined plate, and the width direction of the material distribution sieve plate positioned on the casting sand box is adjustable.

The cloth sieve contains branch material sieve and expansion sieve, it is articulated that branch material sieve wholly is "V" shape and intermediate position, the expansion sieve sets up the both sides at branch material sieve, the expansion sieve is articulated with branch material sieve one end and is arranged, the parallel and horizontal arrangement of articulated shaft of expansion sieve and branch material sieve, the expansion mechanism drive divides the material sieve to rotate around the articulated shaft, the expansion sieve rotates around the articulated shaft, the contained angle between expansion sieve and the branch material sieve is adjustable, divide the contained angle between the material sieve adjustable.

The material separating sieve is characterized in that material blocking grids are arranged below the material separating sieve and on the lower plate surface of the expanding sieve, each material blocking grid comprises a plurality of material blocking grid plates, the material blocking grid plates are arranged along the length direction of the lower plate surface of the material separating sieve and the length direction of the lower plate surface of the expanding sieve, two ends of each material blocking grid plate are hinged to the frame respectively, hinged shafts at two ends of each material blocking grid plate are parallel to the length directions of the material separating sieve and the expanding sieve, and the adjusting mechanism is used for adjusting included angles among the material blocking grid plates, the material separating sieve and the expanding sieve.

The material blocking grating further comprises a material blocking groove, the material blocking groove is parallel to the material separating sieve and the expanding sieve and is arranged along the lower plate surfaces of the material separating sieve and the expanding sieve respectively, the material blocking grid plate is arranged in a notch of the material blocking groove, and the two ends of the material blocking grid plate are rotatably arranged at the positions of notches at the two ends of the material blocking groove respectively.

The adjusting mechanism comprises a support plate connected with a hinged shaft at one end of the material blocking grid plate, the support plate is perpendicular to the hinged shaft of the material blocking grid plate, a sliding hole is formed in the support plate and arranged along the length direction of the support plate, a connecting rod is arranged in each sliding hole, a sliding rod is arranged at one end of each connecting rod and arranged in each sliding hole in a sliding mode, the other end of each connecting rod is hinged to the corresponding adjusting sliding rod, the hinged shafts at the two ends of each connecting rod are arranged in parallel with the hinged shaft of the material blocking grid plate, and the driving unit drives the adjusting sliding rods to move horizontally.

The drive unit includes with adjust slide bar one end articulated actuating lever, the other end of actuating lever is articulated with the drive slider respectively, the drive shaft level at actuating lever both ends just arranges with the actuating lever is perpendicular, the vertical removal of drive slider and upper end are connected with the piston rod of electric jar, the articulated two first drive connecting rods that are provided with on the drive slider, two first drive connecting rods are articulated with the branch material sieve respectively.

The adjusting slide rod comprises a drive tube, a slide rod is arranged in the drive tube in a sliding mode, a spring is arranged in the drive tube, two ends of the spring are abutted to the drive tube and the slide rod respectively, and the rod end of the slide rod is hinged to the drive rod.

Second driving connecting rods are further arranged below the two first driving connecting rods respectively, one ends of the two second driving connecting rods are hinged to the driving sliding blocks respectively, and the other ends of the two second driving connecting rods are hinged to the unfolding screen respectively.

The dust removal mechanism is including enclosing the dustcoat of establishing in cloth sieve outlying, the top of dustcoat is provided with the exhaust column that removes dust, the exhaust column that removes dust communicates with the air inlet of dust remover, the air outlet of dust remover communicates with the air intake of air exhauster.

The dust remover contains first second cavity, the direction is arranged from top to bottom with the second cavity in first cavity, be provided with the twitch board between first cavity and the second cavity, be provided with the dust removal sack between first cavity and the second cavity, the opening of dust removal sack down and with second cavity intercommunication, the upper end of dust removal sack is sealed and is stretched into in the first cavity, be provided with the twitch pole in the first cavity, the upper end blind end of dust removal sack is bound on the twitch pole, the twitch pole is connected with vibration mechanism, and vibration mechanism drive twitch pole horizontal direction reciprocating motion.

The upper plate surface and the lower plate surface of the shaking plate are both provided with connecting pipes, the dust removal cloth bag comprises two sections, the lower end opening of the dust removal cloth bag in the first cavity is fixed with the connecting pipes, the upper end opening of the dust removal cloth bag in the second cavity is fixed with the connecting pipes, and the lower end opening of the dust removal cloth bag is provided with a counterweight ring.

The utility model discloses a vibrating motor, including shaking rod, spring, support and support, shaking rod slip slides and sets up on the tank wall at first cavity place, the rod end of shaking rod stretches out first cavity and is provided with and supports and lean on the gyro wheel, shaking rod stretches out the pole body of first cavity and overlaps to be equipped with and to support and lean on the spring, support and lean on the both ends of spring and support respectively with the tank wall that supports and lean on gyro wheel and first cavity and support and lean on, shaking rod's outer end side is provided with the vibration gyro wheel, the rim of vibration gyro wheel supports with the rim that supports and lean on the gyro wheel and supports.

The utility model discloses a dust excluding hood, including baffle pipe, horizontal migration mechanism, horizontal track, movable roller, dust excluding hood, slip pipe box, horizontal migration mechanism, horizontal track and baffle pipe length direction, the slip is established at the baffle pipe outer wall, horizontal migration mechanism contains the horizontal track that sets up at the baffle pipe outer wall, horizontal track arranges with baffle pipe length direction, be provided with the removal gyro wheel on the slip pipe, it is horizontal just perpendicular with slip pipe length direction to remove the gyro wheel core, it rolls to set up on horizontal track to remove the gyro wheel, the outer wall.

The material receiving chute is arranged below the lower end of the expansion screen, a material receiving groove is arranged at the lower end of the material receiving chute, a material guide mechanism is arranged at the bottom of the material receiving groove, and the coated sand in the material receiving groove is guided out to the material distributing pipe by the material guide mechanism.

The invention has the technical effects that: when leading-in tectorial membrane sand in to the casting sand box, place tectorial membrane sand in tectorial membrane sand derivation mechanism, tectorial membrane sand derivation mechanism derives the tectorial membrane sand of capacity to tectorial membrane sand cloth mechanism in, the tectorial membrane sand that tectorial membrane sand cloth mechanism derived is derived and is personally submitted the rectangle, thereby make even the covering of tectorial membrane sand in the casting sand box, in order to realize the even cloth to the tectorial membrane sand, convenient follow-up tectorial membrane sand can be even the covering in the casting sand box, and utilize dust removal mechanism to implement to take out the raise dust that tectorial membrane sand cloth mechanism export produced fast, thereby ensure the cleanness in operation space, make things convenient for the operation personnel to operate.

Drawings

FIG. 1 is a front view of a coated sand injection system;

FIGS. 2 and 3 are schematic diagrams of two perspective configurations of the coated sand injection system;

FIGS. 4 and 5 are schematic diagrams of two visual angle structures of the precoated sand guiding mechanism;

FIG. 6 is a view showing the structure hi of the material guide tube and the horizontal movement mechanism in the precoated sand discharge mechanism;

FIGS. 7 and 8 are schematic views of two visual structures of the material distributing mechanism and the dust removing mechanism;

FIGS. 9 and 10 are schematic views of two viewing angles of the distribution mechanism;

FIG. 11 is a front view of the distribution mechanism;

FIGS. 12 and 13 are schematic views of two different views of the material distribution mechanism taken from an intermediate position;

FIG. 14 is an enlarged view of I of FIG. 13;

FIG. 15 is a cross-sectional view of the distribution pipe and the distribution cone;

fig. 16 to 18 are schematic views of three viewing angles of the distributing mechanism after the distributing mechanism is cut away from the middle position;

FIG. 19 is a schematic sectional view of the adjusting slide;

FIG. 20 is a front view of the dust removal mechanism;

fig. 21 is a sectional view of the dust removing mechanism.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention will now be described in detail with reference to the following examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed. As used herein, the terms "parallel" and "perpendicular" are not limited to their strict geometric definitions, but include tolerances for machining or human error, legibility and inconsistency;

the precoated sand injection system of the present invention will be described in detail with reference to fig. 1 to 21:

a precoated sand injection system comprises a precoated sand guiding mechanism 10, wherein a precoated sand distributing mechanism 20 is arranged at an outlet of the precoated sand guiding mechanism 10, the outlet of the distributing mechanism 20 enables precoated sand guided out by the precoated sand guiding mechanism 10 to be in a rectangular guiding surface, a dust removing mechanism 30 is arranged below the outlet of the distributing mechanism 20, and the dust removing mechanism 30 is used for guiding out dust at the outlet position of the distributing mechanism 20;

with reference to fig. 1 to 3, when precoated sand is introduced into the casting sand box a, the precoated sand is placed in the precoated sand guiding mechanism 10, the precoated sand guiding mechanism 10 guides sufficient precoated sand into the precoated sand distributing mechanism 20, the precoated sand guided out by the precoated sand distributing mechanism 20 is rectangular, so that the precoated sand is uniformly covered in the casting sand box a, uniform distribution of the precoated sand is realized, subsequent precoated sand can be uniformly covered in the casting sand box a conveniently, and dust generated at the outlet of the precoated sand distributing mechanism 20 is quickly extracted by the dust removing mechanism 30, so that the cleaning of an operation space is ensured, and the operation of operators is facilitated.

In order to ensure that the precoated sand generated by the material distribution mechanism 20 can be covered along the length direction of the casting sand box A, the material distribution mechanism 20 is arranged on a horizontal moving mechanism 40, and the horizontal moving mechanism 40 drives the material distribution mechanism 20 to horizontally reciprocate along the length direction of the casting sand box A;

the material distributing mechanism 20 can reciprocate along the length direction of the horizontal moving mechanism 40, so that the precoated sand guided out by the material distributing mechanism 20 is uniformly covered in the casting sand box A, and the precoated sand is uniformly covered in the casting sand box A.

In order to realize the adjustment of the width direction of the leading-out surface of the material distribution mechanism 20, the width direction and the length direction of the leading-out surface of the material distribution mechanism 20 are adjustable;

the width direction of the derivation surface of the material distribution mechanism 20 can be adjusted to adapt to the size change of the casting sand box A, the length direction of the derivation surface of the material distribution mechanism 20 can be arranged along the width direction of the casting sand box A all the time, the precoated sand derived by the material distribution mechanism 20 can cover the precoated sand along the length direction of the casting sand box A, and the precoated sand injection operation on the casting sand box A is completed.

As a preferred scheme of the present invention, as shown in fig. 4 to 6, the precoated sand guiding mechanism 10 includes a storage tank 11, an outlet is provided at a lower end of the storage tank 11, a material guiding pipe 12 is provided at the outlet, a material guiding screw 13 is provided in the material guiding pipe 12, a driving mechanism drives the material guiding screw 13 to rotate, a sliding pipe 14 is provided at a pipe orifice of the material guiding pipe 12, the sliding pipe 14 forms a sliding fit along the material guiding pipe 12, a material pushing mechanism is provided in the sliding pipe 14, and the material pushing mechanism pushes precoated sand in the sliding pipe 14 out of the pipe orifice;

the precoated sand can be recycled, the precoated sand is guided into the storage tank 11 through the water conveying belt, the storage tank 11 is vertically arranged, the precoated sand is guided into the material guide roller 12 from the outlet at the lower end of the storage roller 11, the material guide screw rod 13 is started, the precoated sand is guided into the sliding pipe 14, the precoated sand in the sliding pipe 14 is guided into the material distribution mechanism 20 by using a material pushing mechanism arranged in the sliding pipe 14, and the material distribution operation of the precoated sand is completed;

the sliding tube 14 can slide along the length direction of the material guiding tube 12, so that the material distribution mechanism 20 can slide along the material guiding tube 12, and thus the continuous feeding operation of the precoated sand in the material distribution mechanism 20 is completed.

Specifically, the sliding tube 14 is integrally of a right-angle tubular structure, one end of the sliding tube 14 is in insertion fit with the material guide tube 12, the material pushing mechanism includes a material pushing screw rod 141 arranged in a tube cavity at the other end of the sliding tube 14, the material pushing screw rod 141 is arranged along the length direction of the material guide tube 12, and a tube opening of the sliding tube 14 forms a material outlet;

the material guiding screw rod 13 is started, so that the material is guided out of the sliding pipe 14, the sliding pipe 14 is at the position of a right-angle pipe, the material pushing screw rod 141 guides the precoated sand entering from one end of the sliding pipe 14 into the material guiding mechanism, and the precoated sand is guided out of the pipe orifice at the other end of the sliding pipe 14 into the material distributing mechanism 20, so that the precoated sand is distributed.

More specifically, in order to realize uniform distribution of precoated sand, with reference to the ball intersection shown in fig. 9 to 18, the distribution mechanism 20 includes a distribution pipe 21, the distribution pipe 21 is vertically arranged, the upper end of the distribution pipe 21 is arranged below the discharge port of the sliding pipe 14, a distribution taper sleeve 22 is arranged in the distribution pipe 21, the distribution taper sleeve 22 is arranged in a small-upper and large-lower manner, the profile of the distribution pipe 21 is matched with the profile of the distribution taper sleeve 22, a gap between the distribution pipe 21 and the distribution taper sleeve 22 forms a distribution channel 23 of precoated sand, and the cross section of the distribution channel 23 is entirely arc-shaped;

the precoated sand led out from one end of the sliding pipe 14 is led out to the pipe orifice at the upper end of the distributing pipe 21, the precoated sand is led into a distributing channel 23 formed between the distributing pipe 21 and the distributing taper sleeve 22, the distributing taper sleeve 22 is arranged in a small-end and large-end manner, the profile of the distributing pipe 21 is matched with the profile of the distributing taper sleeve 22, so that the distributing channel 23 is in a large-end and small-end manner, the leading-out surface of the precoated sand is widened from the upper part to the lower part of a casting, and the precoated sand homogenizing operation is realized.

More specifically, the whole material distribution taper sleeve 22 is of a split semi-cone structure, the material distribution pipe 21 is split in half from the pipe core, two side walls of the material distribution pipe 21 are connected with two sides of the material distribution taper sleeve 22, the upper end of the material distribution pipe 21 is provided with a feeding horn mouth 211, and the feeding horn mouth 211 is connected with the pipe orifice of the sliding pipe 14 into a whole;

the precoated sand is led in from the upper end of the cloth taper sleeve 22 and led in the cloth channel 23 from the feeding bell mouth 211, so that the material homogenizing operation of the precoated sand is completed;

the feeding bell mouth 211 is connected with the mouth of the sliding tube 14 to form a whole, so that the distributing mechanism 20 can slide along with the precoated sand outlet of the precoated sand guiding mechanism 10 to complete continuous guiding of the precoated sand.

More specifically, in order to enable precoated sand which can be led out from the outlet at the lower end of the distribution channel 23 to be in a uniformly distributed rectangular shape, the outer wall of the distribution taper sleeve 22 is provided with a distribution partition plate 221, one side end face of the distribution partition plate 221 is arranged along the bus direction of the distribution taper sleeve 22, the other side of the distribution partition plate 221 is close to the inner wall of the distribution pipe 21, a plurality of distribution partition plates 221 are arranged at intervals along the circumferential direction of the distribution taper sleeve 22, and adjacent distribution partition plates 221 form a channel for leading out the precoated sand;

the cloth partition plates 221 are arranged along the bus direction of the cloth taper sleeve 22, so that a channel formed between every two adjacent partition plates 221 is smaller in size from top to bottom, the coated sand is homogenized, the coated sand is smaller in size from a lower-end outlet leading-out surface casting of the cloth channel 23, and a uniform coated sand leading-out surface is formed.

The distribution channel 23 enables the side length of the guiding surface of the precoated sand, the lower end of the distribution channel 23 is provided with a bulk material inclined plate 24, a distribution sieve plate 25 is arranged below the bulk material inclined plate 24, and the distribution sieve plate 25 is positioned in the width direction of the casting sand box and is adjustable;

foretell cloth passageway 23 presents the rectangle and arranges along casting sand box A's length direction, and the tectorial membrane sand is derived to back in the bulk cargo swash plate 24, and bulk cargo swash plate 24 is derived from the upper end of cloth sieve 25 to the realization is derived the tectorial membrane sieve from the mode that the face of cloth sieve 25 appeared, and cloth sieve 25 makes the tectorial membrane sand arrange according to casting sand box A's width direction, makes the tectorial membrane sand can accomplish the operation of the tectorial membrane sand along length direction to casting sand box A.

More specifically, the distribution sieve plate 25 includes a distribution sieve 251 and an expansion sieve 252, the distribution sieve 251 is integrally V-shaped, the middle of the distribution sieve 251 is hinged, the expansion sieve 252 is disposed at two sides of the distribution sieve 251, the expansion sieve 252 is hinged to one end of the distribution sieve 251, the expansion sieve 252 is parallel to and horizontally disposed with a hinge shaft of the distribution sieve 251, the expansion mechanism drives the distribution sieve 251 to rotate around the hinge shaft, the expansion sieve 252 rotates around the hinge shaft, an included angle between the expansion sieve 252 and the distribution sieve 251 is adjustable, and an included angle between the distribution sieve 251 is adjustable;

the small-size end of the material separating screen 251 is located at the upper end, the precoated sand is guided out from the lower end of the bulk material inclined plate 24 and then is guided out to the upper-size end of the material separating screen 251, the precoated sand is guided out from two side plates of the material separating screen 251 to the expanding screen 252, so that the precoated sand is distributed along the width direction, the precoated sand is distributed, the material distribution operation of the precoated sand is completed, the precoated sand is distributed from the expanding screen 252 and the material separating screen 251, and the precoated sand falls down from the expanding screen 252 and the material separating screen 251, so that the material distribution operation of the precoated sand is completed;

the material separating sieve 251 and the expanding sieve 252 can effectively realize the sieving of the metal slag in the precoated sand, and prevent the metal slag from being guided into the casting sand box A.

More specifically, a material blocking grid 26 is arranged below the material separating screen 251 and on a lower plate surface of the expanding screen 252, the material blocking grid 26 comprises a plurality of material blocking grid plates 261, the 261 are arranged along the length direction of the lower plate surface of the material separating screen 251 and the lower plate surface of the expanding screen 252, two ends of each material blocking grid plate 261 are hinged to a frame 262, hinge shafts at two ends of each material blocking grid plate 261 are parallel to the length directions of the material separating screen 251 and the expanding screen 252, and the adjusting mechanism is used for adjusting included angles among the material blocking grid plates 261, the material separating screen 251 and the expanding screen 252;

the precoated sand is led out from the bulk material inclined plate 24 to the upper end position of the material separating sieve 251 and is uniformly distributed on the expanded sieve 252 along the material separating sieve 251 to complete the uniform distribution operation of the precoated sand, and the included angle between the material separating sieves 251 is obviously smaller than the included angle between the expanded sieve 252 and the material separating sieves 251, so that the precoated sand can be effectively led out from the upper end of the material separating sieves 251 into the expanded sieve 252 to complete the uniform distribution operation of the precoated sand, and the width direction adaptation of the material distributing sieve plate 25 is further adapted by realizing the adjustment of the included angle between the expanded sieve 252 and the material separating sieves 251 and the adjustment of the included angle between the material separating sieves 251 so as to realize the sand coating operation of the material distributing sieve plate 25 on the casting sand box A;

a material blocking grid 26 is arranged below the material separating screen 251 and on the lower plate surface of the expanding screen 252, a material blocking grid plate 261 is arranged in the material blocking grid 26, thereby realizing the adjustment of the adjusting mechanism, changing the rotation angle of the material blocking grid plate 261, adjusting the included angle between the material blocking grid plate 261 and the lower plate surface of the material separating sieve 251 and between the expanded sieve 252 and the material separating sieve 251, when the angle is reduced, the conduction rate of the precoated sand from the spreading screen 252 to the material separating screen 251 is reduced, so that the precoated sand is led out from the material distributing screen plate 25 to the casting sand box A, when the angle is increased, the conduction rate of the precoated sand from the spreading screen 252 and the material separating screen 251 is increased, so that the precoated sand is led out from the distribution screen plate 25 to the casting sand box A, the included angle between the blocking grid 261 and the spreading screen 252 and the lower plate surface of the material separating screen 251 is changed, the sand covering operation of the precoated sand can be completed by adapting to the change and adjustment of the unfolding length of the distribution sieve plate 25;

when the included angle between the material separating screen 251 and the included angle between the expanded screen 252 and the material separating screen 251 are increased, the included angle between the material blocking grid plate 261 and the lower plate surface of the material separating screen 251 and the included angle between the expanded screen 252 and the lower plate surface of the material separating screen 251 are reduced, so that the guiding surface is increased, the conduction rate of the precoated sand is reduced, and the uniform guiding of the precoated sand is completed; similarly, when the included angle between the material separating sieves 251 and the included angle between the expanded sieve 252 and the material separating sieves 251 become smaller, the included angle between the material blocking grid plate 261 and the lower plate surface of the material separating sieves 251 and the included angle between the material blocking grid plate 252 and the lower plate surface of the material separating sieves 251 become smaller, so that the guiding surface becomes smaller, the conduction rate of the precoated sand needs to be increased, the uniform guiding of the precoated sand is completed, and the precoated sand is uniformly covered in the casting sand box A.

More specifically, the blocking grid 26 further includes a blocking groove 263, the blocking groove 263 is parallel to the material separating screen 251 and the expanding screen 252 and is respectively arranged along the lower plate surfaces of the material separating screen 251 and the expanding screen 252, the blocking grid 261 is arranged in the notch of the blocking groove 263, and two ends of the blocking grid 261 are respectively rotatably arranged at the notches at two ends of the blocking groove 263;

for the realization effectively blocks that the tectorial membrane sand is derived, reduce or increase the throughput rate that the tectorial membrane sand passes through keeping off grid plate 261 and expansion sieve 252, keep off the setting of grid plate 261 rotary type and keeping off silo 263 both ends notch position to the realization is to keeping off silo 263 open conduction rate.

More specifically, the adjusting mechanism comprises a support plate 2611 connected with a hinge shaft at one end of the material blocking plate 261, the support plate 2611 is arranged perpendicular to the hinge shaft of the material blocking plate 261, a slide hole 26111 is arranged on the support plate 2611, slide holes 26111 are arranged along the length direction of the support plate 2611, connecting rods 2612 are arranged in the slide holes 26111, a slide rod is arranged at one end of each connecting rod 2612 and is arranged in the slide hole 26111 in a sliding manner, the other end of each connecting rod 2612 is connected with an adjusting slide rod 2613 in a hinged manner, the hinge shafts at two ends of each connecting rod 2612 are arranged in parallel with the hinge shaft of the material blocking plate 261, and a driving unit drives the adjusting slide rod 2613 to move horizontally;

the drive unit starts for adjust slide bar 2613 and slide along the direction of perpendicular to fender grid plate 261, thereby utilize connecting rod 2612 to rotate, and make connecting rod 2612 slide along slide hole 26111, accomplish the regulation to keeping off the pivoted of the articulated shaft in material grid plate 261 both ends, thereby adjust the size of the lower extreme opening of keeping off grid plate 261, the realization is located the regulation of branch material sieve 251 and expansion sieve 252 conductivity to the tectorial membrane sand.

More specifically, the driving unit includes a driving rod 2614 hinged to one end of an adjusting slide rod 2613, the other end of the driving rod 2614 is hinged to a driving slider 27, driving shafts at two ends of the driving rod 2614 are horizontal and are arranged perpendicular to the driving rod 2614, the driving slider 27 moves vertically, the upper end of the driving slider 27 is connected to a piston rod of an electric cylinder 28, two first driving connecting rods 271 are hinged to the driving slider 27, and the two first driving connecting rods 271 are hinged to the material separating sieve 251;

the piston rod of the electric cylinder 28 is vertically arranged, so that the driving slide block 27 vertically moves, the first driving connecting rod 271 adjusts the included angle between the material distribution screen 251, and the driving rod 2614 is linked to move, so that the adjusting slide rod 2613 slides along the sliding direction, the included angle between the material blocking grid plate 261 and the material blocking groove 263 is adjusted, the conduction rate of the precoated sand passing through the material distribution screen 251 and the spreading screen 252 is adjusted, and the precoated sand can follow the sand coating operation along the casting sand box a.

In order to adjust the included angle between the material blocking plate 261 and the material blocking groove 263 and prevent the material blocking plate 261 from further overturning, the adjusting sliding rod 2613 comprises a driving tube 26131, a sliding rod 26132 is slidably arranged in the driving tube 26131, a spring 26133 is arranged in the driving tube 26131, two ends of the spring 26133 are respectively abutted against the driving tube 26131 and the sliding rod 26132, and the rod end of the sliding rod 26132 is hinged to a driving rod 2614;

when the driving slider 27 vertically moves downwards, the driving rod 2614 drives the sliding rod 26132 to slide along the driving pipe 26131 until the included angle between the material blocking grid plate 261 and the material blocking groove 263 is arranged in the minimum state, and the material blocking grid plate 261 rotates for limiting, so that the conduction rate of the material separating screen 251 is in the minimum state, the precoated sand can slide into the expanding screen 252 through the material separating screen 251, and the operation of uniformly covering the precoated sand is completed; when the driving slider 27 vertically moves upwards, the driving rod 2614 drives the sliding rod 26132 to slide along the driving pipe 26131 until the included angle between the material blocking grid plate 261 and the material blocking groove 263 is in a 90-degree state arrangement, and the material blocking grid plate 261 rotates for limiting, so that the conduction rate of the material separating sieve 251 is in a maximum state, the precoated sand can slide down into the expanding sieve 252 through the material separating sieve 251, and the uniform covering operation of the precoated sand is completed.

More specifically, in order to realize the synchronous adjustment of the included angle between the distributing screen 251 and the spreading screen 252, second driving connecting rods 272 are further respectively arranged below the two first driving connecting rods 271, one ends of the two second driving connecting rods 272 are respectively hinged to the driving sliding block 27, and the other ends of the two second driving connecting rods 272 are respectively hinged to the spreading screen 252.

In order to realize effective suction operation of the raised dust generated by the cloth sieve plate 25, the dust removal mechanism 30 comprises a dust removal cover 31 which is arranged around the periphery of the cloth sieve plate 25, a dust removal exhaust pipe 32 is arranged above the dust removal cover 31, the dust removal exhaust pipe 32 is communicated with an air inlet of a dust remover 33, and an air outlet of the dust remover 33 is communicated with an air inlet of an exhaust fan 34;

foretell air exhauster 34 starts to the dust excluding hood 31 lower extreme is provided with the check curtain, and air exhauster 34 starts, realizes the suction operation to dust excluding hood 31, and the raise dust of avoiding deriving can be taken out fast.

More specifically, in order to effectively extract the raised dust, the dust collector 33 includes first and second chambers 331 and 332, the first and second chambers 331 and 332 are arranged in the vertical direction, a shaking plate 333 is disposed between the first and second chambers 331 and 332, a dust removal cloth bag 334 is disposed between the first and second chambers 331 and 332, an opening of the dust removal cloth bag 334 faces downward and is communicated with the second chamber 332, an upper end of the dust removal cloth bag 334 is sealed and extends into the first chamber 331, a shaking rod 335 is disposed in the first chamber 331, an upper end of the dust removal cloth bag 334 is bound to the shaking rod 335, the shaking rod 335 is connected with a vibration mechanism, and the vibration mechanism drives the shaking rod 335 to reciprocate in the horizontal direction;

the vibrating mechanism is started to realize the vibrating operation of the vibrating rod 335, and the vibration of the dust removing cloth bag 334 in the dust remover 33 enables the dust removing cloth bag 334 to vibrate and vibrate the floated precoated sand, thereby ensuring the airflow conductivity of the dust removing cloth bag 334.

More specifically, the upper and lower plate surfaces of the shaking plate 333 are both provided with a connecting pipe 3331, the dust removal cloth bag 334 comprises two sections, the lower end opening of the dust removal cloth bag 334 in the first chamber 331 is fixed with the connecting pipe 3331, the upper end opening of the dust removal cloth bag 334 in the second chamber 332 is fixed with the connecting pipe 3331, and the lower end opening of the dust removal cloth bag 334 is provided with a counterweight ring 3341;

the lower end of the dust removal cloth bag 334 is weighted by the weight ring 3341, so that the opening operation of the dust removal cloth bag 334 is realized, and then the dust filtration operation can be effectively realized by the airflow through the dust removal cloth bag 334.

More specifically, in order to realize the vibration of the dust removal cloth bag 334, the shaking rod 335 is slidably disposed on a box wall where the first chamber 331 is located, a rod end of the shaking rod 335 extends out of the first chamber 331 and is provided with a propping roller 3311, a propping spring 3312 is sleeved on a rod body of the shaking rod 335 extending out of the first chamber 331, two ends of the propping spring 3312 are respectively propped against the propping roller 3311 and the box wall of the first chamber 331, a vibration roller 336 is disposed beside an outer end of the shaking rod 335, a rim of the vibration roller 336 is propped against a rim of the propping roller 3311, the vibration roller 336 is connected with a rotating shaft of the vibration motor 337, and the rotating shaft of the vibration motor 337 is eccentrically connected with the vibration roller 336;

the vibration roller 336 eccentrically rotates, so that the shaking rod 335 shakes in the horizontal direction to shake the dust removal cloth bag 334, and therefore, dust in the dust removal cloth bag 334 is shaken off.

More specifically, in order to enable the whole distributing mechanism 20 to stably slide along the material guiding pipe 12, the sliding pipe 14 is sleeved on the outer wall of the material guiding pipe 12, the horizontal moving mechanism 40 includes a horizontal rail 41 arranged on the outer wall of the material guiding pipe 12, the horizontal rail 41 is arranged in the length direction of the material guiding pipe 12, a moving roller 42 is arranged on the sliding pipe 14, the wheel core of the moving roller 42 is horizontal and perpendicular to the length direction of the sliding pipe 14, the moving roller 42 is arranged on the horizontal rail 41 in a rolling manner, and a poking rod 43 extends from the outer wall of the dust hood 31;

when the material distributing mechanism 20 is horizontally slid, the poke rod 43 is pushed, so that the material distributing mechanism 20 and the dust removing mechanism 30 move along the horizontal direction of the material guide pipe 12, the sand coating operation on the casting sand box A is completed, and after the sand coating operation is completed, an operator can conveniently observe the sand coating condition of the casting sand box A, and the sand coating can be stopped at any time.

A material receiving chute 51 is arranged below the lower end of the expanded screen 252, a material receiving groove is arranged at the lower end of the material receiving chute 51, a material guide mechanism is arranged at the bottom of the material receiving groove, and the material guide mechanism guides the coated sand in the material receiving groove to the distributing pipe 21;

a material receiving sieve plate 52 is arranged above the material receiving chute 51, and a lead-out sloping plate is arranged at the lower end of the material receiving sieve plate 52 and used for leading out metal debris.

The method for injecting the precoated sand into the casting sand box comprises the following characteristics:

firstly, guiding precoated sand into a material storage tank 11 of a precoated sand guiding mechanism 10, starting a material guiding screw rod 13, guiding the precoated sand out of an outlet of a material guiding pipe 12, and guiding the precoated sand into a sliding pipe 14;

secondly, starting a material pushing mechanism, guiding the precoated sand in the sliding pipe 14 to the upper end pipe orifice position of a material distribution pipe 21 of a material distribution mechanism 20, uniformly distributing the precoated sand in a material distribution channel 23 between the material distribution pipe 21 and a material distribution taper sleeve 22, and guiding the precoated sand out of a lower end outlet of the material distribution channel 23 to realize the material distribution of the precoated sand along the length direction of the casting sand box;

thirdly, leading out the lower end of the distribution channel 23 to the bulk material inclined plate 24, so that the precoated sand is led out to a position above the material separating sieve 251 of the distribution sieve plate 25 from the bulk material inclined plate 24;

fourthly, the electric cylinder 28 is started, so that the driving slide block 27 vertically moves, the adjustment of the included angle between the material distribution sieves 251 and the expanded sieves 252 is realized, and the length of the material distribution sieve plate 25 is arranged according to the width direction of the casting sand box;

fifthly, the driving slide block 27 is used for driving the material blocking grid plate 261 to rotate so as to adjust the included angle between the material blocking grid plate 261 and the material blocking groove 263 and adjust the guiding quantity of the precoated sand passing through the material separating sieve 251 and the expanding sieve 252;

sixthly, starting the dust removal mechanism 30 to realize the dust removal operation of the raised dust in the dust removal cover 31;

seventhly, manually pulling the poke rod 43 to enable the material distribution mechanism 20 and the dust removal mechanism 30 to slide along the length direction of the casting sand box so as to realize the sand coating operation in the casting sand box until the coated sand is uniformly covered in the casting sand box;

and eighthly, after the precoated sand is located in the casting sand box, vibrating the casting sand box to uniformly cover the precoated sand in the casting sand box, and finishing the injection operation of the precoated sand.