阅读说明：本技术 一种再生骨料筛分装置 (Recycled aggregate screening plant ) 是由 蒋丽群 王灿熙 张力 吴淑金 于 2020-07-27 设计创作，主要内容包括：本申请涉及一种再生骨料筛分装置,包括机架、转动连接于机架的筛筒、用于驱动筛筒转动的驱动组件、设于机架一侧的且用于往筛筒内进料的进料斗和设于筛筒下方的出料斗；机架转动连接有转动杆,转动杆的转动轴线与筛筒平行,转动杆设有多个绕转动杆周向均匀排布的伸缩杆,伸缩杆的末端设有碾压球,伸缩杆内设有迫使碾压球沿远离转动杆径向移动的弹簧；筛筒开设有多个绕筛筒圆周均匀排布的筛孔,筛孔的出口端设有供碾压球啮合的啮合面一,当筛筒转动时,通过碾压球与筛孔啮合面一的啮合带动转动杆转动。本申请具有减少骨料堵塞的效果。(The application relates to a recycled aggregate screening device which comprises a rack, a screen cylinder rotationally connected to the rack, a driving assembly used for driving the screen cylinder to rotate, a feeding hopper arranged on one side of the rack and used for feeding materials into the screen cylinder, and a discharging hopper arranged below the screen cylinder; the frame is rotatably connected with a rotating rod, the rotating axis of the rotating rod is parallel to the screen cylinder, the rotating rod is provided with a plurality of telescopic rods which are uniformly distributed around the rotating rod in the circumferential direction, the tail end of each telescopic rod is provided with a rolling ball, and a spring which forces the rolling ball to move along the radial direction away from the rotating rod is arranged in each telescopic rod; a plurality of sieve meshes of evenly arranging around a sieve section of thick bamboo circumference are seted up to a sieve section of thick bamboo, and the exit end of sieve mesh is equipped with the meshing face one that supplies to roll the ball meshing, when a sieve section of thick bamboo rotates, drives the dwang through the meshing of rolling ball and sieve mesh meshing face one and rotates. The application has the effect of reducing aggregate blockage.)

1. The utility model provides a recycled aggregate screening plant which characterized in that: comprises a frame (1), a screen drum (2) rotationally connected to the frame (1), a driving component (15) for driving the screen drum (2) to rotate, a feed hopper (13) arranged at one side of the frame (1) and used for feeding materials into the screen drum (2), and a discharge hopper (14) arranged below the screen drum (2); the screen drum is characterized in that the rack (1) is rotatably connected with a rotating rod (4), the rotating axis of the rotating rod (4) is parallel to the screen drum (2), the rotating rod (4) is provided with a plurality of telescopic rods (5) which are uniformly distributed in the circumferential direction around the rotating rod (4), the tail ends of the telescopic rods (5) are provided with rolling balls (6), and springs (57) which force the rolling balls (6) to move radially along the direction far away from the rotating rod (4) are arranged in the telescopic rods (5); a plurality of sieve meshes (21) of evenly arranging around a sieve section of thick bamboo (2) circumference are seted up to a sieve section of thick bamboo (2), the exit end of sieve mesh (21) is equipped with the confession mesh surface (26) of rolling ball (6) meshing, works as when a sieve section of thick bamboo (2) rotates, drives through the meshing of mesh surface (26) of rolling ball (6) and sieve mesh (21) dwang (4) rotate.

2. The recycled aggregate screening apparatus of claim 1, wherein: the rotating rod (4) is located right above the screen drum (2).

3. The recycled aggregate screening apparatus of claim 1, wherein: the first meshing surface (26) is an arc surface, and the curvature center of the first meshing surface (26) is positioned inside the wall of the screen drum (2); the convex structure of outer wall of a sieve section of thick bamboo (2) has tooth protruding (24) that is located between two adjacent sieve meshes (21) of circumferencial direction, the protruding thickness of tooth protruding (24) reduces from middle to both sides along the circumferencial direction gradually, the side that is close to adjacent sieve mesh (21) of tooth protruding (24) is established to supply rolling ball (6) meshed mating surface two (25), mating surface two (25) are the cambered surface, just the centre of curvature of mating surface two (25) is located inside tooth protruding (24), mating surface two (25) with smooth transition between mating surface one (26).

4. The recycled aggregate screening apparatus of claim 3, wherein: the sieve mesh (21) is arranged in a hourglass shape, the hole wall of the sieve mesh (21) is divided into a first conical part (27), an arc-shaped fine waist part (28) and a second conical part (29) along the radial direction of the sieve cylinder (2), the second conical part (29) is opposite to the first conical part (27) away from the axis of the sieve cylinder (2), smooth transition is formed among the first conical part (27), the arc-shaped fine waist part (28) and the second conical part (29), and the second conical part (29) and the first meshing surface (26) are in smooth transition.

5. The recycled aggregate screening apparatus of claim 1, wherein: telescopic link (5) include sleeve pipe (51) and wear to locate bracing piece (52) of sleeve pipe (51), the one end of sleeve pipe (51) with dwang (4) fixed connection, the other end threaded connection of sleeve pipe (51) has a cap (54), the confession has been seted up in cap (54) through-hole (55) that bracing piece (52) passed, the one end of bracing piece (52) is fixed with circle piece (53), circle piece (53) with sleeve pipe (51) axial is slided and is connected, just the diameter of circle piece (53) is greater than through-hole (55), the one end that circle piece (53) were kept away from in bracing piece (52) with roll ball (6) fixed connection.

6. The recycled aggregate screening apparatus of claim 5, wherein: the supporting rod (52), the round block (53) and the rolling ball (6) are integrally formed, and the cap (54) penetrates through an avoiding groove (56) for the supporting rod (52) to enter the through hole (55).

7. The recycled aggregate screening apparatus of claim 6, wherein: the round block (53) is sleeved with the inherent powder metallurgy sleeve (7), and the inner wall of the sleeve (51) is covered with an oil film.

8. The recycled aggregate screening apparatus of claim 7, wherein: the outer wall of the powder metallurgy sleeve (7) is provided with two oil inlet grooves (71) which are symmetrically arranged along the axis of the powder metallurgy sleeve (7), wherein one oil inlet groove (71) is communicated with the end face, close to the rotating rod (4), of the powder metallurgy sleeve (7), and the other oil inlet groove (71) is communicated with the end face, close to the supporting rod (52), of the powder metallurgy sleeve (7); the outer wall of powder metallurgy cover (7) is seted up around arc wall (72) that powder metallurgy cover (7) axis half-cycle set up, the tip intercommunication of an oil feed tank (71) is respectively distinguished at the both ends of arc wall (72), the cell wall and the tank bottom of arc wall (72) are the slope setting, just the opening that two cell walls of arc wall (72) are constituteed increases gradually.

9. The recycled aggregate screening apparatus of claim 5, wherein: frame (1) is fixed with dead lever (3), dwang (4) are equipped with the confession dead lever (3) wear to establish the cavity, just dead lever (3) with be equipped with bearing (31) between dwang (4).

10. The recycled aggregate screening apparatus of claim 9, wherein: the lower part of dead lever (3) is fixed with and is located electro-magnet (8) directly over sieve section of thick bamboo (2) axis, electro-magnet (8) are located in the cavity of dwang (4), work as when electro-magnet (8) circular telegram, the magnetic attraction of electro-magnet (8) forces disk (53) sliding movement, in order to drive crushing ball (6) with sieve section of thick bamboo (2) break away from the meshing.

Technical Field

The application relates to the field of recycled aggregate treatment equipment, in particular to a recycled aggregate screening device.

Background

Concrete aggregate refers to a granular loose material that plays a role of a skeleton or filling in concrete. The aggregate is divided into coarse aggregate and fine aggregate. The coarse aggregate refers to pebbles, broken stones and the like, and the fine aggregate refers to natural sand, artificial sand and the like.

The recycled concrete aggregate is prepared by crushing waste concrete to prepare recycled coarse aggregate and fine aggregate, partially or completely replacing natural coarse aggregate and fine aggregate, and the aggregate obtained by crushing the waste concrete is recycled aggregate.

For example, chinese patent publication No. CN203791183U discloses a vibratory screening device for recycled concrete aggregates, which is easy to discharge, and comprises a screen body, a feeding device, a bracket outer frame, and an electric screen seat.

However, when the device is used, part of aggregates can be clamped on the sieve holes on the sieve body and are difficult to clean, and the screening efficiency of the follow-up aggregates is influenced.

Disclosure of Invention

In order to solve the problem that the sieve mesh was lived to the aggregate card, this application provides a regeneration aggregate screening plant.

The application provides a recycled aggregate screening plant adopts following technical scheme.

A recycled aggregate screening device comprises a rack, a screen drum rotationally connected to the rack, a driving assembly used for driving the screen drum to rotate, a feed hopper arranged on one side of the rack and used for feeding materials into the screen drum, and a discharge hopper arranged below the screen drum; the screen drum is characterized in that the rack is rotatably connected with a rotating rod, the rotating axis of the rotating rod is parallel to the screen drum, the rotating rod is provided with a plurality of telescopic rods which are uniformly distributed along the circumferential direction of the rotating rod, the tail end of each telescopic rod is provided with a rolling ball, and a spring which forces the rolling ball to move along the radial direction far away from the rotating rod is arranged in each telescopic rod; a plurality of sieve meshes of evenly arranging around a sieve section of thick bamboo circumference are seted up to a sieve section of thick bamboo, the exit end of sieve mesh is equipped with the confession the meshing face one of rolling ball meshing, works as when a sieve section of thick bamboo rotates, drives through the meshing of rolling ball and sieve mesh meshing face one the dwang rotates.

By adopting the technical scheme, when the aggregate blocks the sieve pores, in the process that the rolling balls rotate to be meshed and contacted with the meshing surfaces of the sieve pores (part of spherical surfaces of the rolling balls are sunk into the sieve pores), the rolling balls are contacted with the blocked aggregate, the rolling balls are blocked by the blocked aggregate to move and retract, the springs are compressed, the elastic force of the springs is applied to the blocked aggregate through the rolling balls, the blocked aggregate is pushed into the sieve cylinder, the blocking of the aggregate on the sieve pores is reduced, and the normal screening of the sieve cylinder is ensured; and rolling ball and the contact in-process that blocks up the aggregate, the sphere of rolling ball and the outer profile line that blocks up the aggregate are the contact route of blocking up the aggregate, understand that the sphere of rolling ball rolls from the surface that blocks up the aggregate promptly and passes, and block up the aggregate and be irregular lug, consequently rolling ball and the whole process of rolling that blocks up the aggregate, roll the ball promptly and to block up the aggregate application of force from a plurality of positions, thereby force to block up the relative sieve mesh of aggregate and carry out the removal in a plurality of positions, after moving through a plurality of positions, block up the joint position structure between aggregate and the sieve mesh and be destroyed gradually, it loses efficacy gradually to block up being connected between aggregate and the sieve mesh, it is not hard up to block up the aggregate promptly, thereby it is changeing and breaks away from the.

Preferably, the rotating rod is positioned right above the screen drum.

Through adopting above-mentioned technical scheme, roll the ball and move the mesh surface meshing of a sieve mesh to a sieve section of thick bamboo peak and mesh, and then ensure that the jam aggregate in the sieve mesh of this position does not have the aggregate butt in the sieve section of thick bamboo, change promptly and push into the sieve section of thick bamboo with blockking up the aggregate.

Preferably, the first meshing surface is an arc surface, and the curvature center of the first meshing surface is located inside the wall of the screen cylinder; the convex structure of outer wall of a sieve section of thick bamboo has the tooth that is located between two adjacent sieve meshes of circumferencial direction protruding, the protruding thickness of tooth reduces from the centre to both sides along the circumferencial direction gradually, the protruding side that is close to adjacent sieve mesh of tooth is established to supply rolling ball engaged engagement surface two, engagement surface two is the cambered surface, just the curvature center of engagement surface two is located inside the tooth is protruding, engagement surface two with smooth transition between the engagement surface one.

By adopting the technical scheme, the arrangement of the convex meshing surface II is beneficial to the meshing transmission between the grinding balls and the screen cylinder, so that the screen cylinder can be respectively in tangential contact with the grinding balls through the meshing surface I and the meshing surface II, the meshing contact time of the grinding balls and the screen cylinder is prolonged, and the grinding balls are smoothly driven to move; and the first meshing surface and the second meshing surface are both convex cambered surfaces, so that the stress stability of meshing transmission can be ensured as far as possible, the structural damage of the rolling ball is reduced, and the meshing transmission precision is improved.

Preferably, the sieve mesh is hourglass-shaped, the hole wall of the sieve mesh is divided into a first conical part, an arc-shaped thin waist part and a second conical part along the radial direction of the sieve cylinder in sequence, the second conical part is opposite to the axis of the sieve cylinder, the first conical part is far away from the first conical part, the arc-shaped thin waist part and the second conical part are in smooth transition, and the second conical part is in smooth transition with the first meshing surface.

Through adopting above-mentioned technical scheme, through the sieve mesh that sets up hourglass form, it will block on the thin waist of arc to block up the aggregate, and first pyramis and second pyramis portion then provide the activity space for the not hard up of jam aggregate, it rolls and outdated from the surface that blocks up the aggregate promptly when rolling the ball, it receives the effort in a plurality of positions to block up the aggregate, it uses the thin waist of arc as the basic point to block up the aggregate, other position structures that block up the aggregate do irregular circumference reciprocating swing in first pyramis and second pyramis portion, it has certain swing motion to block up the aggregate promptly, thereby the thin waist of arc to the contact site structure's that blocks up the aggregate destruction speed of sieve mesh has been accelerated, and then the not hard up of jam aggregate, and then realize the effect that the jam.

Preferably, the telescopic link includes the sleeve pipe and wears to locate sheathed tube bracing piece, sheathed tube one end with dwang fixed connection, sheathed tube other end threaded connection has the block, the confession has been seted up to the block the through-hole that the bracing piece passed, the one end of bracing piece is fixed with the circle piece, the circle piece with the sleeve pipe axial is slided and is connected, just the diameter of circle piece is greater than the through-hole, the one end that the circle piece was kept away from to the bracing piece with roll ball fixed connection.

By adopting the technical scheme, the elastic expansion effect of the rolling ball can be realized; the round block can rotate, namely the grinding ball can rotate around the axis of the supporting rod, when the grinding ball is subjected to the reaction force blocking the aggregate, part of component of the reaction force forms a moment for forcing the grinding ball to rotate around the supporting rod, and the rotatability of the grinding ball can effectively decompose the moment, so that the damage of the grinding ball caused by the reaction force blocking the aggregate is reduced; and the rotatability of the grinding ball ensures that a plurality of parts of the spherical surface of the grinding ball can contact with the blocking aggregate as much as possible, namely, one part of the spherical surface of the grinding ball can not contact with the blocking aggregate all the time, thereby reducing the damage of partial structure of the spherical surface of the grinding ball.

Preferably, the support rod, the round block and the rolling ball are integrally formed, and the cap penetrates through an avoiding groove for the support rod to enter the through hole.

By adopting the technical scheme, the integral forming is convenient for processing, and the integral structural strength can be ensured; and avoid the setting of groove, the overall structure's of being convenient for installation.

Preferably, the round block sleeve is provided with a powder metallurgy sleeve, and the inner wall of the sleeve is covered with an oil film.

By adopting the technical scheme, the arrangement of the oil film can reduce the friction force when the grinding ball rotates, further reduce the structural damage of the grinding ball caused by blocking the aggregate rotating torque, and the oil film has a damping effect and can buffer the acting force on the grinding ball; and the powder metallurgy cover has tiny hole, can store certain oil mass, and when the powder metallurgy cover rotated, the oil that soaks in the hole permeated to the sleeve pipe inner wall through the capillary action, and then ensured the lubricated effect of oil film to can keep oil film lubrication validity period longer, reduce frequently refuel the operation.

Preferably, two oil inlet grooves symmetrically arranged along the axial center of the powder metallurgy sleeve are formed in the outer wall of the powder metallurgy sleeve along the axial line of the powder metallurgy sleeve, one oil inlet groove is communicated with the end face, close to the rotating rod, of the powder metallurgy sleeve, and the other oil inlet groove is communicated with the end face, close to the supporting rod, of the powder metallurgy sleeve; the outer wall of the powder metallurgy sleeve is provided with an arc-shaped groove which is arranged around the axial half of the powder metallurgy sleeve, the two ends of the arc-shaped groove are respectively communicated with the end parts of an oil inlet groove, the groove wall and the groove bottom of the arc-shaped groove are obliquely arranged, and the opening formed by the two groove walls of the arc-shaped groove is gradually increased.

By adopting the technical scheme, when the powder metallurgy sleeve slides along the axial direction of the sleeve, redundant oil can enter the arc-shaped groove through the oil inlet groove and be stored; when the relative sleeve pipe of powder metallurgy cover rotated, the oil storage in the arc wall will carry out circumference and axial diffusion along the opening of the arc cell wall of arc wall, and then forms the oil film of comprehensive parcel powder metallurgy cover perisporium, has further improved the utilization ratio and the lubricated effect of oil film to the oil storage effect of oil feed tank can reduce the waste of volatilizing of oil film.

Preferably, the frame is fixed with the dead lever, the dwang is equipped with the confession the cavity that the dead lever wore to establish, just the dead lever with be equipped with the bearing between the dwang.

Through adopting above-mentioned scheme, can improve the rotational stability of dwang.

Preferably, the lower part of dead lever is fixed with and is located the electro-magnet directly over a sieve section of thick bamboo axis, the electro-magnet is located in the cavity of dwang, works as when the electro-magnet circular telegram, the magnetic attraction of electro-magnet forces the disk sliding motion, in order to drive the grinding ball with a sieve section of thick bamboo breaks away from the meshing.

Through adopting above-mentioned scheme, when need not the clearance and blockking up the aggregate, but the starting electromagnet will roll the ball and be connected with a sieve section of thick bamboo disengagement, and then improves the rotation smoothness nature under the sieve section of thick bamboo normal condition.

In summary, the present application includes at least one of the following beneficial technical effects:

the grinding balls are in meshed transmission with the screen drum, so that the grinding balls have the effect of grinding the outer surface of the blocking aggregate, the blocking aggregate is forced to move relative to the screen holes in multiple directions, the blocking aggregate is loosened relative to the screen holes, the grinding balls are matched with elastic acting force applied to the blocking aggregate, the blocking aggregate can be pushed into the screen drum easily, blocking of the blocking aggregate is reduced, and normal screening of the screen drum is ensured;

through the arrangement of the hourglass-shaped sieve pores, when the grinding balls are rolled from the outer surface of the blocked aggregate, the blocked aggregate takes the arc-shaped thin waist part as a base point, and other parts of the blocked aggregate structurally perform irregular circular reciprocating swing in the first conical part and the second conical part, even if the blocked aggregate has certain swing motion, so that the damage rate of the arc-shaped thin waist part of the sieve pores on the contact part structure of the blocked aggregate is accelerated, the loosening of the blocked aggregate is accelerated, and the effect of quickly separating the blocked aggregate from the sieve pores is realized;

through setting up powder metallurgy cover and oil film, can reduce the frictional force when rolling the ball and rotating, and then reduce to roll the ball and receive the impaired structure that blocks up aggregate turning moment to the oil film has the shock attenuation effect, can cushion the effort that rolls the ball and receive.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is a schematic view from another perspective of FIG. 1;

fig. 3 is a schematic structural view of the rotating lever of the present embodiment;

FIG. 4 is an exploded view of the present embodiment for showing the internal structure of the telescopic rod;

FIG. 5 is a sectional view of the embodiment for showing the meshing relationship of the milling balls and the screen cylinder;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a state change diagram for embodying the process of contacting the milling balls with the plugging aggregate according to the present embodiment;

fig. 8 is a schematic structural view of the powder metallurgy sleeve of the present embodiment.

Description of reference numerals: 1. a frame; 2. a screen cylinder; 3. fixing the rod; 4. rotating the rod; 5. a telescopic rod; 6. rolling the ball; 7. powder metallurgy housing; 8. an electromagnet; 10. blocking the aggregate; 11. a lower case; 12. an upper shell; 13. a feed hopper; 14. a discharge hopper; 15. a drive assembly; 21. screening holes; 22. a feed slide gate; 23. a discharge sliding door; 24. the teeth are convex; 25. a second meshing surface; 26. a first meshing surface; 27. a first taper portion; 28. an arc-shaped thin waist part; 29. a second tapered section; 31. a bearing; 51. a sleeve; 52. a support bar; 53. a round block; 54. capping; 55. a through hole; 56. an avoidance groove; 57. a spring; 71. an oil inlet groove; 72. an arc-shaped slot; 81. a guide groove.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application discloses a recycled aggregate screening plant. Referring to fig. 1 and 2, the screen drum comprises a frame 1, a shell fixed on the frame 1, a screen drum 2 positioned in the shell, a feed hopper 13 positioned on one side of the frame 1, and a discharge hopper 14 positioned on the other side of the frame 1; the discharge hopper 14 is fixed on the shell, the screen drum 2 is provided with a plurality of screen holes 21 uniformly distributed around the circumference of the screen drum 2, the screen drum 2 is rotatably connected with the shell, the frame 1 is provided with a driving assembly 15 for driving the screen drum 2 to rotate, and the driving assembly 15 is a motor and a speed reducer fixed on the frame 1; the sieve section of thick bamboo 2 slope sets up, and the terminal surface of the higher one end of sieve section of thick bamboo 2 is equipped with feeding sliding door 22, and the terminal surface of the lower one end of sieve section of thick bamboo 2 is equipped with ejection of compact sliding door 23.

When the screen is used, the recycled aggregate is poured into the feed hopper 13 and enters the screen cylinder 2 through the feeding sliding door 22, the motor is started to drive the screen cylinder 2 to rotate, the recycled aggregate starts to be screened, in the process, fine aggregate falls to the discharging hopper 14 from the screen holes 21, coarse aggregate rolls to the lowest position of the screen cylinder 2 under the action of gravity to be collected, and finally is taken out through the discharging sliding door 23, so that the screening of the recycled aggregate is completed; and the casing divide into epitheca 12 and inferior valve 11, and inferior valve 11 is fixed with frame 1, and one side of epitheca 12 is articulated with inferior valve 11, through turning up epitheca 12, can overhaul the inside of the casing.

As shown in fig. 2 and 3, the frame 1 is provided with a fixing rod 3 and a rotating rod 4 which are positioned right above the screen drum 2, the fixing rod 3 is parallel to the axis of the screen drum 2, the fixing rod 3 is fixedly connected with the frame 1, the rotating rod 4 is provided with a cavity for the fixing rod 3 to penetrate through, and the rotating rod 4 is rotatably connected with the fixing rod 3 through a bearing 31; dwang 4 is equipped with a plurality of telescopic links 5 of evenly arranging around self circumference, and the end of telescopic link 5 is equipped with rolling ball 6.

As shown in fig. 4, the telescopic rod 5 includes a sleeve 51 and a support rod 52 penetrating through the sleeve 51, one end of the sleeve 51 is fixedly connected with the rotating rod 4, an inner cavity of the sleeve 51 is communicated with a cavity of the rotating rod 4, one end of the support rod 52 is integrally formed with a round block 53, the round block 53 is connected with the sleeve 51 in a sliding manner along an axial direction, the other end of the support rod 52 is integrally formed with the rolling ball 6, a spring 57 is placed in the sleeve 51, and one end of the spring 57 abuts against an end surface of the round block 53 away from the rolling ball 6; and one end of the sleeve 51 far away from the rotating rod 4 is in threaded connection with a cap 54, the cap 54 is provided with a through hole 55 for the support rod 52 to pass through, the diameter of the through hole 55 is smaller than that of the round block 53, and the cap 54 is provided with an avoiding groove 56 for the support rod 52 to enter the through hole 55.

In installation, as shown in fig. 5, the spring 57 and the round block 53 are sequentially placed in the sleeve 51, then the support rod 52 is passed through the cap 54 by the avoiding groove 56, and finally the cap 54 is screwed to the end of the sleeve 51 to limit the escape of the round block 53.

As shown in fig. 5 and 6, the outer wall of the screen drum 2 is convexly configured with a tooth protrusion 24 located between two adjacent screen holes 21 in the circumferential direction, the protruding thickness of the tooth protrusion 24 gradually decreases from the middle to two sides along the circumferential direction, the side surface of the tooth protrusion 24 close to the adjacent screen holes 21 is provided with a second meshing surface 25 for meshing the grinding balls 6, the second meshing surface 25 is an arc surface, and the curvature center of the second meshing surface 25 is located inside the tooth protrusion 24; the outlet end of the sieve pore 21 is provided with a first meshing surface 26 for meshing the grinding balls 6, the first meshing surface 26 is a cambered surface, the curvature center of the first meshing surface 26 is positioned in the wall of the sieve cylinder 2, and the first meshing surface 26 and the second meshing surface 25 are in smooth transition; when the screen cylinder 2 rotates, the rolling balls 6 are respectively engaged with the first engaging surface 26 and the second engaging surface 25 to drive the rotating rod 4 to rotate.

As shown in fig. 6, the screen hole 21 is formed in an hourglass shape, the hole wall of the screen hole 21 is divided into a first conical portion 27, an arc-shaped thin waist portion 28 and a second conical portion 29 in sequence along the radial direction of the screen cylinder 2, the second conical portion 29 is far away from the axis of the screen cylinder 2 relative to the first conical portion 27, the arc-shaped thin waist portion 28 and the second conical portion 29 are in smooth transition, and the second conical portion 29 and the first engaging surface 26 are in smooth transition.

Under a normal state, the screen cylinder 2 rotates and drives the grinding ball 6 to rotate around the axis of the rotating rod 4 through meshing transmission, when the aggregate blocks the screen holes 21, the grinding ball 6 is simultaneously contacted with the blocking aggregate 10 (see fig. 7) in the meshing contact process of the grinding ball 6 and the meshing surface I26 (which can be understood as that part of the spherical surface of the grinding ball 6 is sunk into the screen holes 21), the grinding ball 6 is blocked by the blocking aggregate 10 to move and retract, the spring 57 is compressed, the elastic force of the spring 57 is applied to the blocking aggregate 10 through the grinding ball 6, and then the blocking aggregate 10 is pushed into the screen cylinder 2, so that the blocking of the screen holes 21 by the aggregate is reduced, and the normal screening of the screen cylinder 2 is ensured; in the process that the grinding ball 6 is in contact with the blocking aggregate 10, the contact path between the spherical surface of the grinding ball 6 and the blocking aggregate 10 is the outer contour line of the blocking aggregate 10, namely the spherical surface of the grinding ball 6 is ground from the outer surface of the blocking aggregate 10 (see fig. 7), and the blocking aggregate 10 is an irregular bump, so that in the whole grinding process of the grinding ball 6 and the blocking aggregate 10, the grinding ball 6 applies force to the blocking aggregate 10 from multiple directions, so that the blocking aggregate 10 is forced to move relative to the sieve holes 21 in multiple directions, after moving in multiple directions, the clamping part structure between the blocking aggregate 10 and the sieve holes 21 is gradually broken, the connection between the blocking aggregate 10 and the sieve holes 21 is gradually failed, namely the blocking aggregate 10 is loosened, and the blocking aggregate 10 is more easily separated from the sieve holes 21.

Moreover, because the sieve holes 21 are funnel-shaped, the blocking aggregate 10 is easily clamped on the arc-shaped thin waist part 28, when the rolling ball 6 rolls from the outer surface of the blocking aggregate 10, the blocking aggregate 10 is subjected to acting forces in a plurality of directions, the blocking aggregate 10 takes the arc-shaped thin waist part 28 as a base point, and other parts of the blocking aggregate 10 are in irregular circular reciprocating swing in the first cone part 27 and the second cone part 29 (see fig. 7), namely, the blocking aggregate 10 has certain swing motion, so that the damage rate of the arc-shaped thin waist part 28 of the sieve holes 21 to the contact part structure of the blocking aggregate 10 is accelerated, the loosening of the blocking aggregate 10 is accelerated, and the effect that the blocking aggregate 10 is quickly separated from the sieve holes 21 is realized.

When the grinding ball 6 is subjected to the reaction force blocking the aggregates 10, part of the component of the reaction force forms a moment forcing the grinding ball 6 to rotate around the support rod 52, the moment can cause the structure of the support rod 52 to be damaged, in order to effectively solve the moment, the arrangement is made as shown in fig. 4, the inner wall of the sleeve 51 is covered with an oil film, the round block 53 is internally provided with the powder metallurgy sleeve 7, the outer wall of the powder metallurgy sleeve 7 is attached to the inner wall of the sleeve 51, and the powder metallurgy sleeve 7 has an oil storage effect and can keep the lubricating effect of the oil film for a long time; and the setting of oil film can reduce the frictional force when rolling ball 6 rotates around bracing piece 52, and rolling ball 6 improves greatly around bracing piece 52 pivoted flexibility promptly, and then can effectively resolve this moment through high rotation is nimble to the oil film has the shock attenuation effect, can cushion the effort that rolling ball 6 received.

Meanwhile, as shown in fig. 8, the outer wall of the powder metallurgy sleeve 7 is provided with two oil inlet grooves 71 symmetrically arranged along the axis of the powder metallurgy sleeve 7, wherein one oil inlet groove 71 is communicated with the end surface of the powder metallurgy sleeve 7 close to the rotating rod 4, and the other oil inlet groove 71 is communicated with the end surface of the powder metallurgy sleeve 7 close to the supporting rod 52; the outer wall of the powder metallurgy sleeve 7 is provided with an arc-shaped groove 72 which is arranged around the axis half circle of the powder metallurgy sleeve 7, the two ends of the arc-shaped groove 72 are respectively communicated with the end part of one oil inlet groove 71, the groove wall and the groove bottom of the arc-shaped groove 72 are obliquely arranged, and the opening formed by the two groove walls of the arc-shaped groove 72 is gradually increased.

When the powder metallurgy sleeve 7 slides along the axial direction of the sleeve 51, redundant oil can enter the arc-shaped groove 72 through the oil inlet groove 71 to be stored; when the powder metallurgy sleeve 7 rotates relative to the sleeve 51, the oil storage in the arc-shaped groove 72 can be diffused along the inclined opening of the arc-shaped groove 72 in the circumferential direction and the axial direction, so that an oil film which completely wraps the circumferential wall of the powder metallurgy sleeve 7 is formed, and the utilization rate and the lubricating effect of the oil film are further improved.

In order to ensure normal use of the screen drum 2 without cleaning the blocked aggregate 10, as shown in fig. 5, an electromagnet 8 positioned right above the axis of the screen drum 2 is fixed at the lower part of a fixed rod 3, the electromagnet 8 is positioned in a cavity of a rotating rod 4, and the fixed rod 3 is provided with a wire guide groove so as to facilitate the connection of a conductive wire of the electromagnet 8; when the electromagnet 8 is powered on, the magnetic attraction of the electromagnet 8 forces the round block 53 to slide so as to drive the grinding balls 6 to be disengaged from the screen cylinder 2, thereby ensuring the rotation fluency of the screen cylinder 2 in the normal state.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.