CN116251734B

CN116251734B - Screening device for dry-mixed mortar production

Info

Publication number: CN116251734B
Application number: CN202310276287.XA
Authority: CN
Inventors: 阮建根; 周永建; 陈威俊; 徐敏勇; 宣汉良; 鲁庆云; 胡军明
Original assignee: Zhejiang Yisen Jiucheng Environmental Protection Equipment Co ltd
Current assignee: Zhejiang Yisen Jiucheng Environmental Protection Equipment Co ltd
Priority date: 2023-03-21
Filing date: 2023-03-21
Publication date: 2023-08-18
Anticipated expiration: 2043-03-21
Also published as: CN116251734A

Abstract

The invention discloses a screening device for dry-mixed mortar production, which is characterized in that: including screening barrel storehouse, screening barrel storehouse upper portion is connected with the inlet pipe, screening barrel storehouse lower part is provided with the discharge gate, screening barrel storehouse inside is provided with the sieve, and the sieve intermediate position is provided with the bearing, and the rotation is provided with the hollow shaft in the bearing, and the hollow shaft periphery is located the position of sieve top and is connected with the dwang, installs the push pedal below the dwang, and the hollow shaft upper end wears out screening barrel storehouse and is connected with initiative bevel gear, and the part that the hollow shaft worn out screening barrel storehouse is connected with driven gear, and driving motor is installed on screening barrel storehouse upper portion. The invention can clean the sieve plate midway in the screening process to remove the materials clamped in the sieve plate so as to ensure the normal operation of the new screening round.

Description

Screening device for dry-mixed mortar production

Technical Field

The invention relates to the technical field of dry-mixed mortar production equipment, in particular to a screening device for dry-mixed mortar production.

Background

Dry-mixed mortar is a granular or powdery material which is formed by physically mixing aggregate, inorganic cementing material, additives and the like which are subjected to drying and screening treatment according to a certain proportion, and is transported to a construction site in a bag or bulk mode, and the materials which can be directly used after being mixed with water are also called mortar dry powder, dry-mixed mortar and dry-mixed powder, and some building adhesives also belong to the category, the dry-mixed mortar plays roles of bonding, lining, protection and decoration in a thin layer in the building industry, and the application of building and decoration engineering is very wide. The aggregate used in the dry-mixed mortar may be machine-made sand, which is obtained by crushing stone. And the obtained machine-made sand has different grain diameters, and the machine-made sand meeting the requirements is obtained through screening. During the screening process, sand may become stuck in the openings of the screen deck. After a large amount of sieve holes are blocked, the screening performance is greatly reduced, and finally, the screening cannot be performed normally.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a screening device for dry-mixed mortar production.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the screening device for dry-mixed mortar production comprises a screening barrel bin, wherein the upper part of the screening barrel bin is connected with a feed pipe, the lower part of the screening barrel bin is provided with a discharge hole, a screen plate is arranged in the screening barrel bin, a bearing is arranged in the middle of the screen plate, a hollow shaft is rotationally arranged in the bearing, the periphery of the hollow shaft is connected with a rotating rod at the position above the screen plate, a push plate is arranged below the rotating rod, the upper end of the hollow shaft penetrates out of the screening barrel bin and is connected with a driving bevel gear, the part of the hollow shaft penetrating out of the screening barrel bin is connected with a driven gear, the upper part of the screening barrel bin is provided with a driving motor, a motor shaft of the driving motor is in driving connection with the driving gear, the driving gear is meshed with the driven gear, a central shaft is arranged in the hollow shaft, the part of the central shaft exceeding the hollow shaft is connected with the driven bevel gear, be provided with the elevating system who is used for driving the center pin and reciprocate on the screening barrel storehouse, the last rotation of elevating system is provided with drive bevel gear, drive bevel gear meshes with driven bevel gear, annular rail is installed to the bottom of the inner wall of hollow shaft, the card is equipped with the hanging block on the annular rail, the sieve below is provided with the rotating block, the hanging block lower extreme is connected with the upper end of rotating block, be provided with the compressor in the rotating block, rotating block upper portion is provided with a plurality of air nozzles, the compressor is connected with each air nozzle, rotating block inner is connected with the supporting shoe, supporting shoe upper portion is provided with the linkage piece, the gangway with linkage piece matched with is seted up to the center pin bottom, screening barrel storehouse lateral wall is located the position of sieve top and is provided with row material pipe, row material pipe inside is provided with the solenoid valve, row material pipe lower part is provided with the air pump.

Preferably, a sealing ring is arranged between the sieve plate and the hollow shaft, and the sealing ring is positioned above the bearing.

Preferably, the lifting mechanism comprises a screw rod seat, a screw rod motor is arranged on the upper portion of the screw rod seat, a screw rod is connected with a screw rod motor in a driving mode, a screw rod sliding block is arranged on the screw rod, a rotating seat is connected to the side face of the screw rod sliding block, a transmission frame is connected to one side, far away from the screw rod sliding block, of the rotating seat, a connecting block is connected to the transmission frame, a limiting ring is connected to the periphery of a central shaft, and the limiting ring is arranged in the connecting block.

Preferably, the upper part of the supporting block is provided with a groove, a trigger block is arranged in the groove, a first spring is connected between the bottom of the trigger block and the bottom of the groove, a trigger is arranged at the bottom of the groove, and the trigger is electrically connected with the motor.

Preferably, the mounting groove is arranged below the rotating rod, the clamping block is connected to the upper portion of the push plate and is inserted into the mounting groove, the guide seat is arranged at the outer end of the rotating rod, the stop block is arranged inside the guide seat, and the second spring is connected between the stop block and the guide seat.

Preferably, a rotating motor is arranged at the bottom of the screening barrel bin, a rotating frame is connected to a motor shaft of the rotating motor, a drying pipe is arranged at the upper part of the rotating frame, and a stirring plate is arranged on the side face of the drying pipe.

Preferably, the rotary frame is internally provided with a cavity, the drying pipe is rotationally arranged on the rotary frame, the bottom of the drying pipe is connected with a transmission gear, the bottom of the cavity is provided with a support rail, the support rail is rotationally provided with a gear ring, the bottom of the cavity is provided with a servo motor, a motor shaft of the servo motor is connected with a driving gear, the transmission gear is meshed with the outer ring of the gear ring, and the driving gear is meshed with the inner ring of the gear ring.

Preferably, a discharging ring is arranged at the position, above the sieve plate, in the screening barrel bin, the bottom of the discharging ring is in contact with the upper part of the sieve plate, the inner diameter of the discharging ring is gradually reduced from top to bottom, and a discharging gap is formed in the position, corresponding to the position of the discharging pipe, of the discharging ring.

Compared with the prior art, the invention has the beneficial effects that: the sand materials are pushed to move on the sieve plate through the push plate, so that the sand materials meeting the particle size requirement pass through sieve holes on the sieve plate, and the screening mode is free from vibration, and the generated noise is relatively small in vibration screening; in the screening process, the sieve holes of the sieve plate are cleaned in an air blowing mode, sand materials clamped in the sieve holes are removed, and the sieve plate has a good screening function.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a cross-sectional view of the present invention;

FIG. 4 is a schematic view of a lifting mechanism according to the present invention;

FIG. 5 is a cross-sectional view of the lift mechanism of the present invention;

FIG. 6 is an enlarged schematic view of FIG. 3 at A;

FIG. 7 is an enlarged schematic view of FIG. 6 at A;

FIG. 8 is an enlarged schematic view at B in FIG. 3;

fig. 9 is an enlarged schematic view at C in fig. 3.

Reference numerals: 1. screening a barrel bin; 2. a feed pipe; 3. a motor frame; 4. a driving motor; 5. a central shaft; 6. a hollow shaft; 7. a screw rod seat; 8. a discharge pipe; 9. a blowing assisting mechanism; 10. a blanking ring; 11. a discharging notch; 12. a rotating lever; 13. a sieve plate; 14. a drive gear; 15. a driven gear; 16. a drive bevel gear; 17. a driven bevel gear; 18. a drive bevel gear; 19. a rotating seat; 20. a screw motor; 21. a transmission frame; 22. a connecting block; 23. a limiting ring; 24. a screw rod; 25. a screw rod sliding block; 26. a rotating block; 27. an air nozzle; 28. an air pump; 29. a discharge port; 30. a protective cover; 31. a rotating electric machine; 32. a rotating frame; 33. a drying tube; 34. a stirring plate; 35. a seal ring; 36. a linkage groove; 37. a linkage block; 38. an endless track; 39. a hanging block; 40. a support block; 41. a compressor; 42. a push plate; 43. a bearing; 44. a groove; 45. a trigger block; 46. a trigger; 47. a first spring; 48. a clamping block; 49. a guide seat; 50. a stop block; 51. a second spring; 52. an electromagnetic valve; 53. a cavity; 54. a transmission gear; 55. a support rail; 56. a gear ring; 57. a servo motor; 58. and a drive gear.

Detailed Description

Embodiments of the present invention are described in detail below with reference to fig. 1-9.

The screening device for dry-mixed mortar production comprises a screening barrel bin 1, wherein the upper part of the screening barrel bin 1 is connected with a feed pipe 2, the lower part of the screening barrel bin 1 is provided with a discharge hole 29, a screen plate 13 is arranged in the screening barrel bin 1, a hole is formed in the middle of the screen plate 13, a bearing 43 is arranged in the hole, a hollow shaft 6 is arranged in the bearing 43 in a rotating mode, a rotary rod 12 is connected to the position, above the screen plate 13, of the periphery of the hollow shaft 6, a push plate 42 is arranged below the rotary rod 12, the upper end of the hollow shaft 6 penetrates out of the screening barrel bin 1 and is connected with a drive bevel gear 16, the part, penetrating out of the hollow shaft 6, of the screening barrel bin 1 is connected with a driven gear 15, the upper part of the screening barrel bin 1 is connected with a motor frame 3, a driving motor 4 is arranged on the motor frame 3, a motor shaft of the driving motor 4 is connected with a driving gear 14, the driving gear 14 is meshed with the driven gear 15, a central shaft 5 is arranged in the hollow shaft 6, the upper end of the central shaft 5 exceeds the upper end of the hollow shaft 6 by a certain distance, the part of the central shaft 5 exceeding the hollow shaft 6 is connected with a driven bevel gear 17, a screening barrel bin 1 is provided with a lifting mechanism for driving the central shaft 5 to move up and down, a transmission bevel gear 18 is rotatably arranged on the lifting mechanism, the transmission bevel gear 18 is meshed with the driven bevel gear 17, an annular track 38 is arranged at the bottom of the inner wall of the hollow shaft 6, a hanging block 39 is clamped on the annular track 38, a rotating block 26 is arranged below the screen plate 13, the lower end of the hanging block 39 is connected with the upper end of the rotating block 26, a compressor 41 is arranged in the rotating block 26, a plurality of air nozzles 27 are arranged at the upper part of the rotating block 26, the compressor 41 is connected with each air nozzle 27, the inner end of the rotating block 26 is connected with a supporting block 40, a linkage block 37 is arranged at the upper part of the supporting block 40, a linkage groove 36 matched with the linkage block 37 is arranged at the bottom of the central shaft 5, the screening barrel bin 1 is provided with row material pipe 8 in the position that the lateral wall is located screen 13 top, and row material pipe 8 inside is provided with solenoid valve 52, and row material pipe 8 lower part is provided with air pump 28.

The push plate 42 is made of rubber, has certain bending deformation performance, and can bend and pass when encountering blocked sand.

Sand enters the screening barrel bin 1 through the feed pipe 2 and falls on the screen plate 13. The hollow shaft 6 drives the rotating rod 12 to rotate, and the rotating rod 12 drives the push plate 42 below to rotate. The pushing plate 42 pushes the sand to move on the screen plate 13, the sand meeting the particle size requirement can fall from the screen holes on the screen plate 13 and enter the lower part to be collected, and the sand not meeting the particle size requirement is left above the screen plate 13. By opening the solenoid valve 52, the negative pressure generated by the air pump 28 draws out the sand remaining on the screen 13 from the discharge pipe 8. Because the sand material is irregular in shape, the sand material can enter the sieve holes, but the sand material is blocked in the sieve holes due to the condition of being blocked in the sieve holes caused by overturning, so that the follow-up screening is affected. After one round of screening is completed, the central shaft 5 is driven to descend by driving the lifting mechanism, so that the transmission bevel gear 18 is contacted with the drive bevel gear 16, and the driving motor 4 drives the central shaft 5 and the hollow shaft 6 to rotate at the same time. Simultaneously, the central shaft 5 descends to enable the linkage block 37 to be clamped into the linkage groove 36 at the bottom of the central shaft 5, so that the support block 40 is driven to rotate together through the cooperation of the linkage groove 36 and the linkage block 37 while the central shaft 5 rotates, and then the support block 40 is enabled to drive the rotating block 26 to rotate below the screen plate 13. The inside of the rotary block 26 is provided with a compressor 41, and the compressor 41 compresses air and ejects the air from the air nozzle 27, so that the air is blown into the sieve holes of the sieve plate 13, and sand stuck in the sieve holes is blown out from the bottom to the top. The non-conforming sand is discharged through the discharge pipe 8, and then the screening of the next round is carried out, so that the screen plate 13 keeps the original screening performance.

A sealing ring 35 is arranged between the screen plate 13 and the hollow shaft 6, and the sealing ring 35 is positioned above the bearing 43. The outer side of the sealing ring 35 abuts against the hole wall in the middle of the sieve plate 13, a part of the inner side of the sealing ring 35 abuts against the periphery of the hollow shaft 6, and the other part of the inner side of the sealing ring 35 abuts against the ring groove formed in the hollow shaft 6. By blocking of the sealing ring 35, sand can be effectively prevented from entering a gap between the screen plate 13 and the hollow shaft 6, and normal rotation of the hollow shaft 6 is ensured.

Preferably, the lifting mechanism comprises a screw rod seat 7, a screw rod motor 20 is arranged on the upper portion of the screw rod seat 7, a screw rod 24 is connected to the screw rod motor 20 in a driving mode, a screw rod sliding block 25 is arranged on the screw rod 24, a rotating seat 19 is connected to the side face of the screw rod sliding block 25, a transmission frame 21 is connected to one side, far away from the screw rod sliding block 25, of the rotating seat 19, a rotating shaft of a transmission bevel gear 18 penetrates through the transmission frame 21 and is rotatably arranged in the rotating seat 19, a connecting block 22 is connected to the transmission frame 21, a limiting ring 23 is connected to the periphery of a central shaft 5, the limiting ring 23 is arranged in the connecting block 22, and the limiting ring 23 can rotate in the connecting block 22. The screw motor 20 drives the screw 24 to rotate so as to drive the screw slide block 25 to move up and down, thereby driving the central shaft 5 to lift through the transmission frame 21 and controlling whether the central shaft 5 rotates or not.

Preferably, the upper portion of the supporting block 40 is provided with a groove 44, a trigger block 45 is arranged in the groove 44, a first spring 47 is connected between the bottom of the trigger block 45 and the bottom of the groove 44, a trigger 46 is arranged at the bottom of the groove 44, and the trigger 46 is electrically connected with the compressor 41. When the central shaft 5 descends, the trigger block 45 is pressed against the trigger block 45, so that the trigger block 45 is retracted into the groove 44, and the trigger block 45 is contacted with the trigger 46 to send a signal to the compressor 41 for starting. The compressor 41 is only started when needed, and the compressor 41 is kept in a closed state at ordinary times, so that the problem that sand cannot fall from sieve holes to influence normal screening caused by blowing compressed gas generated by the compressor 41 out of the air nozzles 27 in the screening process is avoided.

Preferably, the pusher plate 42 collides with the sand stuck in the mesh holes when rotated, and is easily damaged. To ensure that the push plate 42 retains its original function, the push plate 42 needs to be replaced periodically. Through seting up the mounting groove in dwang 12 below, push pedal 42 upper portion is connected with fixture block 48, and fixture block 48 inserts the mounting groove and sets up, and the outside one end of dwang 12 is provided with guide holder 49, and guide holder 49 inside is provided with dog 50, is connected with spring two 51 between dog 50 and the guide holder 49. The stopper 50 is pulled back into the guide seat 49, so that the mounting groove below the rotating rod 12 is exposed, the clamping block 48 above the push plate 42 is inserted along the mounting groove, the stopper 50 is released again, the stopper 50 is ejected out, and the stopper 50 is clamped outside the clamping block 48, so that the push plate 42 is mounted below the rotating rod 12. And when the detachable type door lock is detached, the same mode is adopted. The mounting mode is easy to disassemble and is suitable for frequent replacement.

Preferably, two discharge ports 29 are provided. The screening barrel storehouse 1 bottom is provided with rotary motor 31 in the position between two discharge gates 29, is connected with swivel mount 32 on rotary motor 31's the motor shaft, and swivel mount 32 upper portion is provided with drying tube 33, and drying tube 33 side is provided with stirring board 34. The outside cover of rotating electrical machines 31 is equipped with protection casing 30, and protection casing 30 is used for protecting rotating electrical machines 31, prevents that sand material from causing the destruction to rotating electrical machines 31. The rotating motor 31 drives the rotating frame 32 to rotate so as to drive the drying pipe 33 to rotate in the screening barrel bin 1, stir the sand in the screening barrel bin 1, and simultaneously heat and dry the sand to reduce the water content of the sand.

The rotating motor 31 is located above the top of the discharge opening 29, and when sand falls through screening by the screen plate 13, the sand is prevented from piling around the rotating motor 31.

Preferably, a cavity 53 is arranged in the rotating frame 32, the drying pipe 33 is rotatably arranged on the rotating frame 32, the bottom of the drying pipe 33 is connected with a transmission gear 54, a supporting rail 55 is arranged at the bottom of the cavity 53, a gear ring 56 is rotatably arranged on the supporting rail 55, a servo motor 57 is arranged at the bottom of the cavity 53, a driving gear 58 is connected to a motor shaft of the servo motor 57, the transmission gear 54 is meshed with the outer ring of the gear ring 56, and the driving gear 58 is meshed with the inner ring of the gear ring 56. The servo motor 57 drives the driving gear 58 to rotate, the driving gear 58 drives the gear ring 56 to rotate, and the gear ring 56 drives the drying tube 33 to rotate through cooperation with the transmission gear 54. The drying pipe 33 can either independently rotate to drive the stirring plate 34 to rotate or rotate along with the rotation of the rotating frame 32 to effectively stir the sand materials, so that the sand materials are uniformly mixed.

Preferably, in order to ensure the normal rotation of the push plate 42 in the screening drum magazine 1, the outer end of the push plate 42 is spaced apart from the inner wall of the screening drum magazine 1. Sand within this distance is susceptible to accumulation because it cannot be pushed by the push plate 42. In order to avoid the accumulation phenomenon, a blanking ring 10 is arranged in the screening barrel bin 1 at a position above the screen plate 13, the bottom of the blanking ring 10 is in contact with the upper part of the screen plate 13, and the inner diameter of the blanking ring 10 is gradually reduced from top to bottom. The inclined inner wall of the inner side of the blanking ring 10 can guide the sand and enable the sand to slide down towards the push plate 42. The bottom of the sand at the edge is pushed by the push plate 42, and the sand above the bottom falls down and slides down along the inner wall of the blanking ring 10, so that the sand is effectively prevented from being accumulated.

A discharge gap 11 is arranged on the blanking ring 10 corresponding to the position of the discharge pipe 8 for sand to pass through, so that the sand can be normally discharged from the discharge pipe 8.

The screening barrel bin 1 is provided with a blowing assisting mechanism 9 at a position below the screening 13, and the blowing assisting mechanism 9 is a fan and the like. During blanking, the blowing assisting mechanism 9 can blow the sand in the screening barrel bin 1, so that the sand can be discharged from the discharge hole 29 more quickly.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims

1. Screening device is used in dry-mixed mortar production, its characterized in that: comprises a screening barrel bin (1), a feeding pipe (2) is connected to the upper part of the screening barrel bin (1), a discharging hole (29) is arranged at the lower part of the screening barrel bin (1), a screen plate (13) is arranged in the screening barrel bin (1), a bearing (43) is arranged at the middle position of the screen plate (13), a hollow shaft (6) is arranged in the bearing (43) in a rotating mode, a rotating rod (12) is connected to the position, above the screen plate (13), of the periphery of the hollow shaft (6), a push plate (42) is arranged below the rotating rod (12), a driving bevel gear (16) is arranged at the upper end of the hollow shaft (6) in a penetrating mode, a driven gear (15) is connected to the part, penetrating out of the screening barrel bin (1), a driving motor (4) is arranged at the upper part of the screening barrel bin (1), a driving gear (14) is connected to a motor shaft of the driving motor (4), the driving gear (14) is meshed with the driven gear (15), a central shaft (5) is arranged in the hollow shaft (6), a part, exceeding the central shaft (6) is connected with a driven bevel gear (17), a lifting mechanism (18) is arranged on the screening barrel bin (1), and a lifting mechanism is arranged on the central shaft (5), the transmission bevel gear (18) is meshed with the driven bevel gear (17), an annular track (38) is arranged at the bottom of the inner wall of the hollow shaft (6), a hanging block (39) is clamped on the annular track (38), a rotating block (26) is arranged below the sieve plate (13), the lower end of the hanging block (39) is connected with the upper end of the rotating block (26), a compressor (41) is arranged in the rotating block (26), a plurality of air nozzles (27) are arranged on the upper portion of the rotating block (26), the compressor (41) is connected with each air nozzle (27), a supporting block (40) is connected with the inner end of the rotating block (26), a linkage block (37) is arranged on the upper portion of the supporting block (40), a linkage groove (36) matched with the linkage block (37) is formed in the bottom of the central shaft (5), a discharge pipe (8) is arranged at the position, above the sieve plate (13), an electromagnetic valve (52) is arranged in the side wall of the screening bin (1), and an air pump (28) is arranged on the lower portion of the discharge pipe (8).

The upper portion of supporting shoe (40) has offered recess (44), and recess (44) inside is provided with trigger piece (45), is connected with spring one (47) between trigger piece (45) bottom and recess (44) bottom, and recess (44) bottom is provided with trigger (46), trigger (46) and compressor (41) electric connection.

2. The screening device for dry-mixed mortar production according to claim 1, wherein: a sealing ring (35) is arranged between the sieve plate (13) and the hollow shaft (6), and the sealing ring (35) is positioned above the bearing (43).

3. The screening device for dry-mixed mortar production according to claim 1, wherein: the lifting mechanism comprises a screw rod seat (7), a screw rod motor (20) is arranged on the upper portion of the screw rod seat (7), a screw rod (24) is connected with the screw rod motor (20) in a driving mode, a screw rod sliding block (25) is arranged on the screw rod (24), a rotating seat (19) is connected to the side face of the screw rod sliding block (25), a transmission frame (21) is connected to one side, far away from the screw rod sliding block (25), of the rotating seat (19), a connecting block (22) is connected to the transmission frame (21), a limiting ring (23) is connected to the periphery of the central shaft (5), and the limiting ring (23) is arranged in the connecting block (22).

4. The screening device for dry-mixed mortar production according to claim 1, wherein: the mounting groove is offered to dwang (12) below, and push pedal (42) upper portion is connected with fixture block (48), and fixture block (48) insert the mounting inslot and set up, and the one end of dwang (12) outside is provided with guide holder (49), and guide holder (49) inside is provided with dog (50), is connected with spring two (51) between dog (50) and guide holder (49).

5. The screening device for dry-mixed mortar production according to claim 1, wherein: the screening barrel bin (1) bottom is provided with rotating electrical machines (31), is connected with swivel mount (32) on the motor shaft of rotating electrical machines (31), and swivel mount (32) upper portion is provided with drying tube (33), and drying tube (33) side is provided with stirring board (34).

6. The screening device for dry-mixed mortar production according to claim 5, wherein: the inside cavity (53) that is provided with of swivel mount (32), drying tube (33) rotate and set up on swivel mount (32), drying tube (33) bottom is connected with drive gear (54), cavity (53) bottom is provided with support rail (55), rotate on support rail (55) and be provided with ring gear (56), cavity (53) bottom is provided with servo motor (57), be connected with driving gear (58) on the motor shaft of servo motor (57), drive gear (54) mesh with the outer lane of ring gear (56), driving gear (58) mesh with the inner circle of ring gear (56).

7. The screening device for dry-mixed mortar production according to claim 1, wherein: a blanking ring (10) is arranged at the position above the screen plate (13) in the screening barrel bin (1), the bottom of the blanking ring (10) is in contact with the upper part of the screen plate (13), the inner diameter of the blanking ring (10) is gradually reduced from top to bottom, and a discharging notch (11) is formed in the position, corresponding to the position of the discharging pipe (8), of the blanking ring (10).