CN112845081A

CN112845081A - Multistage centrifugal screening equipment of gravel and sand edulcoration

Info

Publication number: CN112845081A
Application number: CN202110105410.2A
Authority: CN
Inventors: 李蔷
Original assignee: Shenzhen Shengtewei Industrial Co ltd
Current assignee: Quzhou Baohong Building Materials Co Ltd
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-05-28
Anticipated expiration: 2041-01-26
Also published as: CN112845081B

Abstract

The invention relates to the technical field of civil engineering, in particular to a sand and stone impurity removal multistage centrifugal screening device which comprises a machine body, wherein an auger body extending up and down is fixedly arranged at the left end of the machine body, an auger cavity extending up and down is arranged in the auger body, and in the sand and stone impurity removal multistage centrifugal screening device provided by the invention, in the process of high-speed rotation of a screen barrel, larger sand in the screen barrel can rotate at high speed along with the screen barrel and is thrown out under the action of centrifugal force, so that the sand can be rapidly screened, the traditional sand screening mode of manual throwing is replaced, the time and labor saving effect is achieved, the multistage screen barrel can effectively separate multistage sand, the requirements of workers on different sands are met, the sand falling into the screen barrel can be effectively dried and light impurities can be screened, the dried sand is lighter and is easier to be thrown out of the screen barrel, and the screening efficiency and quality are greatly improved, the scrap iron removing mechanism can remove scrap iron in sand.

Description

Multistage centrifugal screening equipment of gravel and sand edulcoration

Technical Field

The invention relates to the technical field of civil engineering, in particular to a sand and stone impurity removal multistage centrifugal screening device.

Background

The thickness of the sand is an average thickness of sand grains of different grain sizes mixed together. Generally, the sand is divided into coarse sand, medium sand and fine sand. The grain composition of the sand refers to the matching proportion of the sand particles. The graded sand not only can save cement, but also improves the compactness and strength of concrete and mortar.

The method of traditional screening sand is that after people stipulated the sand net, the manual work utilizes the spade to put in the sand on the screen cloth a bit, and fine sand can run through the screen cloth and fall into collection device, and the stone and the great impurity in the sand can be blockked by the screen cloth and stop on the screen cloth on the surface, and the screening sand that utilizes artifical a bit not only wastes time and energy but also the screening sand effect is not good like this, and this problem that leads to traditional screening sand mode practicality to be poor appears.

Some current sand screening machines can not dry the sand in advance, and moist sand glues together, produces great influence to the effect of screening sand to, on the building site, there are some iron fillings in most of sand, be difficult to get rid of. In addition, the existing sand screening machine can only screen one kind of sand, and does not meet the requirements of workers on the use of various kinds of sand, so that a sand and stone impurity removal multistage centrifugal screening device is needed to be designed to solve the problems.

Disclosure of Invention

The invention aims to provide a sand and stone impurity removal multistage centrifugal screening device which can overcome the defects in the prior art, so that the practicability of the device is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a gravel impurity removal multistage centrifugal screening device which comprises a machine body, wherein a packing auger body extending up and down is fixedly arranged at the left end of the machine body, a packing auger cavity extending up and down is arranged in the packing auger body, a conical tooth cavity is arranged at the upper side of the packing auger cavity in the packing auger body, a belt cavity extending downwards is arranged at the right side of the conical tooth cavity in the packing auger body, a lifting forward direction is fixedly arranged at the right end wall of the packing auger body, a lifting shaft penetrating through the belt cavity and extending into the conical tooth cavity is arranged at the left power of the lifting forward direction, a motor bevel gear is fixedly arranged at the left end of the lifting shaft, the motor bevel gear can drive a lifting mechanism in the packing auger cavity to move to lift gravel upwards through downward transmission, a motor belt pulley which is solid inside is fixedly arranged in the belt cavity, and the motor belt pulley can drive a drying mechanism at the right side of the packing auger body The machine body is internally provided with a centrifugal cavity, the lower end wall of the centrifugal cavity is fixedly provided with a backing material collecting plate, the centrifugal cavity is positioned on the left side of the backing material collecting plate and is communicated downwards with a backing material cavity with a downward opening, the upper end wall of the machine body is fixedly provided with a centrifugal motor, the centrifugal motor is provided with a centrifugal shaft extending to the lower end wall of the centrifugal cavity in a downward power mode, the centrifugal shaft rotates to drive a centrifugal mechanism positioned in the centrifugal cavity to carry out centrifugal screening on sand and stones, the centrifugal cavity is communicated upwards and is provided with a slide block cavity, the upper end wall of the slide block cavity is fixedly provided with a cylinder, the cylinder moves to drive an opening and closing mechanism positioned in the centrifugal cavity to open and close in a motion control mode, the left side of the slide block cavity in the machine body is provided with an iron removing cavity, the iron removing cavity is communicated downwards and is provided, and an iron removing mechanism for removing iron chips in the gravel is arranged in the iron removing cavity.

Furtherly, hoist mechanism includes auger chamber downside switches on the open feeding channel left that sets up left, auger body left end wall fixed be provided with the feed frame that feeding channel switches on the setting, auger chamber upside is located belt chamber middle part switch-on right is provided with the right lifting blanking chamber of opening, the awl tooth chamber with the auger chamber rotates the auger axle that is provided with upper and lower extension within a definite time, auger axle upper end fixed be provided with motor bevel gear engaged auger bevel gear, the auger axle is located auger intracavity fixation is provided with the auger.

Further, the drying mechanism includes be located in the fuselage lie in the fuselage lift blanking chamber downside is provided with the air-blowing chamber of opening right, the air-blowing chamber with the belt chamber rotates to be provided with about extending fan blade axle, fan blade axle left end is fixed and is provided with the flabellum band pulley, the flabellum band pulley with only the belt is connected between the motor band pulley and is set up, the fixed flabellum that is provided with of fan blade axle right-hand member, the fixed miscellaneous support frame of collection that upwards extends that is provided with of fuselage upper end wall, the fixed miscellaneous frame of collection that is provided with in miscellaneous support frame upper end, the fixed baffle that upwards extends that is provided with of miscellaneous frame right-hand member of collection.

Furthermore, the centrifugal mechanism comprises four outwardly extending first-stage support rods fixedly arranged on a circumferential array on the centrifugal shaft, a first-stage centrifugal barrel which is communicated up and down is fixedly arranged on the first-stage support rods, a first-stage collecting barrel is fixedly arranged in the centrifugal cavity, a first-stage collecting pipe with a downward opening is arranged at the right side of the first-stage collecting barrel in a downward communicating manner, four outwardly extending second-stage support rods fixedly arranged on the centrifugal shaft and arranged on the circumferential array under the first-stage support rods, a second-stage centrifugal barrel which is smaller than the first-stage centrifugal barrel in a vertical communicating manner is fixedly arranged on the second-stage support rods, a second-stage collecting barrel is fixedly arranged at the lower side of the first-stage collecting barrel in the centrifugal cavity, a second-stage collecting pipe with a downward opening is arranged at the right side of the second-stage collecting barrel in a downward communicating manner, the centrifugal separation device is characterized in that a third-stage centrifugal barrel which is smaller than the second-stage centrifugal barrel in size and is communicated up and down is fixedly arranged on the third-stage supporting rod, a third-stage collecting barrel is fixedly arranged on the lower side of the second-stage collecting barrel in the centrifugal cavity, and a third-stage collecting pipe with a downward opening is arranged on the right side of the third-stage collecting barrel in a downward communicated manner.

Further, the opening and closing mechanism comprises a sliding block which is arranged in a narrow-width position of the air cylinder and is positioned in a sliding block cavity and arranged in a vertical sliding manner, a bottom plate control rod which is coaxial with the centrifugal shaft is arranged on the sliding block in a rotating manner, a support rod cavity which is matched with the first-stage support rod, the second-stage support rod and the third-stage support rod and extends up and down is arranged on the bottom plate control rod, a first-stage bottom cover which is matched with the lower end of the first-stage centrifugal barrel is fixedly arranged on the bottom plate control rod, the lower end of the first-stage bottom cover is made of elastic materials, a second-stage bottom cover which is matched with the lower end of the second-stage centrifugal barrel is fixedly arranged on the bottom plate control rod, the second-stage bottom cover is slightly longer than the first-stage bottom cover, the lower end of the second-stage bottom, the third-stage bottom cover is slightly longer than the second-stage bottom cover, and the lower end of the third-stage bottom cover is made of elastic materials.

Further, deironing mechanism includes the hollow deironing axle that extends around the rotation of the bilateral symmetry sets up around the deironing chamber between the front and back end wall, the fixed deironing shifting block that is provided with of deironing off-axial end wall circumference array equipartition, be located between the front and back end wall of deironing chamber the deironing is epaxial to the eccentric fixed magnet that is provided with of bilateral symmetry center, the fixed iron collection chamber that is provided with of deironing chamber lower extreme wall bilateral symmetry.

The invention has the beneficial effects that: according to the sand and stone impurity removal multistage centrifugal screening device provided by the invention, in the process of high-speed rotation of the screen barrel, large sand in the screen barrel can rotate at high speed along with the screen barrel and is thrown out under the action of centrifugal force, so that the sand can be rapidly screened, a traditional manual sand screening mode is replaced, the sand screening device has the effects of saving time and labor, multistage screen barrels can effectively sort multistage sand, the requirements of workers on different sands are met, the sand falling into the screen barrel can be effectively dried and light impurities can be screened, the sand after drying is lighter and is more easily thrown out of the screen barrel, the screening efficiency and quality are greatly improved, and scrap iron in the sand can be removed by the scrap iron cleaning mechanism.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

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

FIG. 1 is a schematic diagram of the overall structure of a multi-stage centrifugal screening device for removing impurities from sand and stone.

Fig. 2 is a schematic view of the structure a-a in fig. 1.

FIG. 3 is a schematic diagram of B-B in FIG. 1.

Fig. 4 is a schematic view of the structure of C-C in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The multistage centrifugal screening equipment for removing the impurities from the sand and stones, which is combined with the attached drawings 1-4, comprises a machine body 10, wherein an auger body 31 extending from top to bottom is fixedly arranged at the left end of the machine body 10, an auger cavity 30 extending from top to bottom is arranged in the auger body 31, a conical tooth cavity 47 is arranged at the upper side of the auger cavity 30 in the auger body 31, a belt cavity 44 extending downwards is arranged at the right side of the conical tooth cavity 47 in the auger body 31, a lifting advancing 50 is fixedly arranged at the right end wall of the auger body 31, a lifting shaft 51 penetrating through the belt cavity 44 and extending into the conical tooth cavity 47 is arranged at the left power of the lifting advancing 50, a motor bevel gear 48 is fixedly arranged at the left end of the lifting shaft 51, the motor bevel gear 48 is driven downwards to drive a lifting mechanism 100 located in the auger cavity 30 to move so as to lift the sand and stones upwards, the lifting shaft 51 is fixedly arranged in the belt cavity 44 and is provided with an internal solid motor, the motor belt wheel 49 is driven downwards to drive the drying mechanism 200 positioned on the right side of the auger body 31 to move to dry the lifted sand and stone and blow off impurities, a centrifugal cavity 11 is arranged in the machine body 10, a bottom material collecting plate 22 is fixedly arranged on the lower end wall of the centrifugal cavity 11, the centrifugal cavity 11 is positioned on the left side of the bottom material collecting plate 22 and is communicated downwards with a bottom material cavity 27 with a downward opening, a centrifugal motor 55 is fixedly arranged on the upper end wall of the machine body 10, a centrifugal shaft 26 extending to the lower end wall of the centrifugal cavity 11 is arranged on the downward power of the centrifugal motor 55, the centrifugal shaft 26 rotates to drive the centrifugal mechanism 300 positioned in the centrifugal cavity 11 to carry out centrifugal screening on the sand and stone, a slide block cavity 60 is communicated upwards from the centrifugal cavity 11, an air cylinder 58 is fixedly arranged on the upper end wall of the slide block cavity 60, and the air cylinder 58 can drive the opening and closing mechanism 400 positioned in the centrifugal cavity 11 to move to, be located in the fuselage 10 slider chamber 60 left side is provided with deironing chamber 35, deironing chamber 35 switch-on is provided with centrifugal feedstock channel 33 downwards, deironing chamber 35 upwards switch-on is provided with deironing feedstock channel 40, be provided with the deironing mechanism 500 who clears away the iron fillings in the gravel and sand in the deironing chamber 35.

Beneficially, hoist mechanism 100 includes auger cavity 30 downside switch-on left opening feedstock channel 29 left that sets up, the fixed with of auger body 31 left end wall with feedstock frame 28 that feedstock channel 29 switch-on set up, auger cavity 30 upside is located belt cavity 44 middle part switch-on right is provided with opening right lifting blanking chamber 52, awl tooth chamber 47 with auger cavity 30 rotates between and is provided with auger shaft 45 that extends from top to bottom, auger shaft 45 upper end fixed be provided with auger bevel gear 46 of motor bevel gear 48 meshing, auger shaft 45 is located auger cavity 30 internal fixation is provided with auger 32.

Beneficially, drying mechanism 200 includes be located in fuselage 10 lift blanking chamber 52 downside is provided with the air-blowing chamber 41 that the opening is right, air-blowing chamber 41 with belt chamber 44 rotates between and is provided with left and right extension's fan shaft 53, fan shaft 53 left end is fixed and is provided with flabellum band pulley 43, flabellum band pulley 43 with only the belt connection setting between motor band pulley 49, fan shaft 53 right-hand member is fixed and is provided with flabellum 42, fuselage 10 upper end wall is fixed and is provided with the miscellaneous support frame 56 of collection that upwards extends, miscellaneous frame 56 upper end is fixed and is provided with miscellaneous frame 54 of collection, miscellaneous frame 54 right-hand member is fixed and is provided with the baffle 57 that upwards extends.

Beneficially, the centrifugal mechanism 300 includes four outwardly extending first-stage support rods 14 fixedly disposed on the centrifugal shaft 26 in a circumferential array, a first-stage centrifugal barrel 12 vertically penetrating is fixedly disposed on the first-stage support rods 14, a first-stage collecting barrel 13 is fixedly disposed in the centrifugal chamber 11, a first-stage collecting pipe 23 with a downward opening is disposed on the right side of the first-stage collecting barrel 13 in a downward connection manner, four outwardly extending second-stage support rods 62 fixedly disposed on the centrifugal shaft 26 in a circumferential array on the lower side of the first-stage support rods 14 in a downward connection manner, a second-stage centrifugal barrel 61 with a size smaller than that of the first-stage centrifugal barrel 12 is fixedly disposed on the second-stage support rods 62, a second-stage collecting barrel 17 is fixedly disposed on the lower side of the first-stage collecting barrel 13 in the centrifugal chamber 11 in a downward connection manner, a second-stage collecting, the centrifugal shaft 26 is provided with four outwards extending three-stage support rods 20 which are fixedly arranged on the lower side of the second-stage support rod 62 in a circumferential array manner, three-stage centrifugal barrels 64 which are smaller than the second-stage centrifugal barrels 61 in a vertical through manner are fixedly arranged on the three-stage support rods 20, three-stage collecting barrels 19 are fixedly arranged on the lower side of the second-stage collecting barrel 17 in the centrifugal cavity 11, and three-stage collecting pipes 25 with downward openings are arranged on the right side of each three-stage collecting barrel 19 in a downward connection manner.

Advantageously, the opening and closing mechanism 400 includes a slide block 59 disposed at a narrow height of the cylinder 58 and disposed in the slide block cavity 60 to slide up and down, a bottom plate control rod 63 disposed on the slide block 59 and coaxial with the centrifugal shaft 26 to rotate, a support rod cavity 16 extending up and down and engaged with the first-stage support rod 14, the second-stage support rod 62 and the third-stage support rod 20 and disposed on the bottom plate control rod 63, a first-stage bottom cover 15 engaged with the lower end of the first-stage centrifugal barrel 12 and fixedly disposed on the bottom plate control rod 63, the lower end of the first-stage bottom cover 15 is made of an elastic material, a second-stage bottom cover 18 engaged with the lower end of the second-stage centrifugal barrel 61 and fixedly disposed on the bottom plate control rod 63, the second-stage bottom cover 18 is slightly longer than the first-stage bottom cover 15, the lower end of the second-stage bottom cover 18 is made of an elastic material, the lower end of the bottom plate control rod 63, the third-stage bottom cover 21 is slightly longer than the second-stage bottom cover 18, and the lower end of the third-stage bottom cover 21 is made of elastic material.

Beneficially, deironing mechanism 500 includes hollow deironing axle 37 that extends around the bilateral symmetry rotation setting between end wall around deironing chamber 35, deironing axle 37 outer end wall circumference array equipartition is fixed and is provided with deironing shifting block 36, end wall position around deironing chamber 35 is in deironing axle 37 is inside to the eccentric fixed magnet 39 that is provided with in bilateral symmetry center, end wall bilateral symmetry is fixed under deironing chamber 35 is provided with collection iron chamber 34.

The fixing and connecting method in this embodiment includes, but is not limited to, bolting, welding, and the like.

As shown in fig. 1 to 4, when the apparatus of the present invention is in the initial state, the air cylinder 58 is in the contracted state, that is, the primary bottom cover 15 abuts against the primary centrifugal barrel 12 to close the same, the secondary bottom cover 18 abuts against the secondary centrifugal barrel 61 to close the same, and the tertiary bottom cover 21 abuts against the tertiary centrifugal barrel 64 to close the same.

Sequence of mechanical actions of the whole device: when a forklift is used for dumping sand and stones into the feeding frame 28, the lifting forward part 50 is started to drive the lifting shaft 51 to rotate, so as to drive the motor bevel gear 48 to rotate, so as to drive the auger bevel gear 46 to rotate, so as to drive the auger 32 to rotate, so as to convey the sand and stones in the feeding frame 28 upwards into the lifting blanking cavity 52, the sand and stones fall into the iron removing cavity 35 under the action of gravity, the lifting shaft 51 rotates and simultaneously drives the motor belt wheel 49 to rotate, so as to drive the fan blades 43 to rotate, so as to drive the fan blades 42 to rotate to dry the lifted sand and stones and blow impurities into the impurity collecting frame 54, the baffle 57 can block the impurities, the iron removing shifting block 36 is pushed to drive the iron removing shaft 37 to rotate during the falling motion of the sand and iron chips in the iron removing shaft are attracted to the surface of the iron removing shaft 37 by the magnet 39, and the iron removing shaft 37 makes the iron filings far away from the magnet 39 to make the iron filings lose attraction and fall into the iron collecting cavity 34, the sand and stone after impurity removal is completely removed falls into the first-stage centrifugal barrel 12 through the centrifugal feeding channel 33, the lifting and advancing 50 is stopped after a certain amount of sand and stone is accumulated in the first-stage centrifugal barrel 12, then the centrifugal motor 55 is started to rotate to drive the centrifugal shaft 26 to rotate, so as to drive the first-stage centrifugal barrel 12, the second-stage centrifugal barrel 61 and the third-stage centrifugal barrel 64 to rotate, the sand and stone with larger level is thrown out and falls into the first-stage collecting barrel 13, the second-stage collecting barrel 17 and the third-stage collecting barrel 19 for classification, the centrifugal motor 55 is stopped after classification is finished, and the cylinder 58 is simultaneously started to drive the sliding block 59 to drive the bottom plate control rod 63 to move downwards so that the first-stage bottom 15 and the first-stage centrifugal barrel 12, The second-stage bottom cover 18 is also a third-stage centrifugal barrel 64, the third-stage bottom cover 21 and the third-stage centrifugal barrel 64 are separated from abutting connection, small sand and stones in the second-stage centrifugal barrel fall into the next stage, the first-stage bottom cover 15, the second-stage bottom cover 18 and the third-stage bottom cover 21 which are made of different lengths and elastic materials guarantee that the sand and stones cannot fall off over the stage, then the air cylinder 58 is started to reset to drive the first-stage bottom cover 15, the second-stage bottom cover 18 and the third-stage bottom cover 21 to reset, and the process of cleaning, drying and screening the sand and stones can be completed by.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a multistage centrifugal screening equipment of gravel and sand edulcoration, includes the fuselage, its characterized in that: the auger body that extends about the fuselage left end is fixed to be provided with, the auger chamber that extends about being provided with in the auger body, the auger body is located in the auger body auger chamber upside is provided with the awl tooth chamber, the auger body is located in the auger body awl tooth chamber right side is provided with downwardly extending's belt chamber, the fixed promotion that is provided with of auger body right end wall advances, promote to advance left power and be provided with and run through the belt chamber and extend to the promotion axle in the awl tooth chamber, the fixed motor bevel gear that is provided with in promotion axle left end, motor bevel gear underdrive can drive the hoist mechanism motion that is located in the auger chamber and upwards promote gravel and sand, the promotion axle is located the fixed inside solid motor band pulley that is provided with in the belt chamber, motor band pulley underdrive can drive the dry mechanism motion that is located auger body right side is dried the gravel and is blown simultaneously debris, the machine body is internally provided with a centrifugal cavity, the lower end wall of the centrifugal cavity is fixedly provided with a backing material collecting plate, the centrifugal cavity is positioned at the left side of the backing material collecting plate and is communicated downwards with a backing material cavity with a downward opening, the upper end wall of the machine body is fixedly provided with a centrifugal motor, the centrifugal motor is provided with a centrifugal shaft extending to the lower end wall of the centrifugal cavity in a downward power mode, the centrifugal shaft rotates to drive a centrifugal mechanism positioned in the centrifugal cavity to carry out centrifugal screening on sand and stones, the centrifugal cavity is communicated upwards and is provided with a slide block cavity, the upper end wall of the slide block cavity is fixedly provided with an air cylinder, the air cylinder moves to drive an opening and closing mechanism positioned in the centrifugal cavity to open and close, the left side of the slide block cavity in the machine body is provided with an iron removing cavity, the iron removing cavity is communicated downwards and is, and an iron removing mechanism for removing iron chips in the gravel is arranged in the iron removing cavity.

2. The multistage centrifugal screening equipment for removing impurities from sand and stones as claimed in claim 1, wherein: hoist mechanism includes auger chamber downside switches on the opening feedstock channel left that sets up left, auger body left end wall is fixed be provided with the feed frame that feedstock channel switches on the setting, auger chamber upside is located belt chamber middle part switch-on is provided with the right lifting blanking chamber of opening right, the awl tooth chamber with auger chamber rotates the auger axle that is provided with upper and lower extension within a definite time, auger axle upper end fixed be provided with motor bevel gear meshed's auger bevel gear, the auger axle is located auger intracavity fixation is provided with the auger.

3. The multistage centrifugal screening equipment for removing impurities from sand and stones as claimed in claim 1, wherein: the drying mechanism comprises the fuselage is located lifting blanking chamber downside is provided with the air-blowing chamber of opening right, the air-blowing chamber with the belt chamber rotates to be provided with about extending fan leaf axle, fan leaf axle left end is fixed and is provided with the flabellum band pulley, the flabellum band pulley with only the belt is connected between the motor band pulley and is set up, the fixed flabellum that is provided with of fan leaf axle right-hand member, the fixed miscellaneous support frame of collection that upwards extends that is provided with of fuselage upper end wall, the fixed miscellaneous frame of collection that is provided with in miscellaneous support frame upper end of collection, the fixed baffle that upwards extends that is provided with of miscellaneous frame right-hand member of collection.

4. The multistage centrifugal screening equipment for removing impurities from sand and stones as claimed in claim 1, wherein: the centrifugal mechanism comprises four first-stage supporting rods which extend outwards and are fixedly arranged on a circumferential array on the centrifugal shaft, a first-stage centrifugal barrel which is communicated from top to bottom is fixedly arranged on the first-stage supporting rods, a first-stage collecting barrel is fixedly arranged in the centrifugal cavity, a first-stage collecting pipe with a downward opening is arranged at the right side of the first-stage collecting barrel in a downward communicating mode, four second-stage supporting rods which extend outwards and are fixedly arranged on the centrifugal shaft and are positioned below the first-stage supporting rods in a circumferential array, a second-stage centrifugal barrel which is smaller than the first-stage centrifugal barrel in a vertical communicating mode is fixedly arranged on the second-stage supporting rods, a second-stage collecting barrel is fixedly arranged at the lower side of the first-stage collecting barrel in the centrifugal cavity, a second-stage collecting pipe with a downward opening is arranged at the right side of the second, the centrifugal separation device is characterized in that a third-stage centrifugal barrel which is smaller than the second-stage centrifugal barrel in size and is communicated up and down is fixedly arranged on the third-stage supporting rod, a third-stage collecting barrel is fixedly arranged on the lower side of the second-stage collecting barrel in the centrifugal cavity, and a third-stage collecting pipe with a downward opening is arranged on the right side of the third-stage collecting barrel in a downward communicated manner.

5. The multistage centrifugal screening equipment for removing impurities from sand and stones as claimed in claim 1, wherein: the opening and closing mechanism comprises a sliding block which is arranged in a sliding block cavity and is in a narrow height arrangement of the air cylinder and is arranged in a vertical sliding manner, a bottom plate control rod which is coaxial with the centrifugal shaft is arranged on the sliding block in a rotating manner, a supporting rod cavity which is matched with the first-stage supporting rod, the second-stage supporting rod and the third-stage supporting rod and extends up and down is arranged on the bottom plate control rod, a first-stage bottom cover which is matched with the lower end of the first-stage centrifugal barrel is fixedly arranged on the bottom plate control rod, the lower end of the first-stage bottom cover is made of elastic materials, a second-stage bottom cover which is matched with the lower end of the second-stage centrifugal barrel is fixedly arranged on the bottom plate control rod, the second-stage bottom cover is slightly longer than the first-stage bottom cover, the lower end of the second-stage bottom cover is made of elastic materials, a third, the lower end of the three-stage bottom cover is made of elastic materials.

6. The multistage centrifugal screening equipment for removing impurities from sand and stones as claimed in claim 1, wherein: the deironing mechanism includes hollow deironing axle that extends around the rotation of bilateral symmetry sets up between the end wall around the deironing chamber, the fixed deironing shifting block that is provided with of deironing off-axial end wall circumference array equipartition, be located between the end wall around the deironing chamber the deironing is epaxial to the fixed magnet that is provided with of bilateral symmetry center eccentricity, the fixed iron collection chamber that is provided with of deironing chamber lower extreme end wall bilateral symmetry.