CN214438264U

CN214438264U - Multidirectional motion mixes quick-witted inner bag compounding agitating unit convenient to maintain

Info

Publication number: CN214438264U
Application number: CN202120063944.9U
Authority: CN
Inventors: 王其胜; 朱磊; 马彩霞
Original assignee: Henan Zhongjie Pharmaceutical Co ltd
Current assignee: Henan Zhongjie Pharmaceutical Co ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2021-10-22
Anticipated expiration: 2031-01-12

Abstract

The utility model provides a multidirectional motion mixer inner container mixed material stirring device convenient to maintain, which comprises a bottom plate, a support frame, a stirring box, a bottom roll-over stand structure, a fixed plate, a movable roll-over stand structure, a box cover, a rotating shaft, a side roll-over stand structure, a mounting frame, a forward rotation motor, a feeding cover, a discharging hopper, a discharging cover and a movable motor, wherein the support frame is respectively welded at the front end and the rear end of the upper part of the bottom plate; the stirring box is arranged on the inner side of the supporting frame; the bottom roll-over stand structure is arranged at the lower part of the inner side of the stirring box; the fixed plates are respectively connected to the left side and the right side of the upper part of the bottom plate through bolts. The utility model has the advantages that: through the arrangement of the bevel gears, the gear rings and the overturning screen plate, the horizontal rod can rotate horizontally by taking the transmission shaft as the circle center, and the bottom of the material can be overturned after the horizontal rod is combined with the overturning screen plate, so that the overturning effect of the device on the bottom of the material is improved.

Description

Multidirectional motion mixes quick-witted inner bag compounding agitating unit convenient to maintain

Technical Field

The utility model belongs to the technical field of the bio-pharmaceuticals, especially, relate to a multidirectional motion mixes quick-witted inner bag compounding agitating unit of machine convenient to maintain.

Background

When the production is carried out, the medicine raw materials with different functions are required to be mixed, various medicaments are added into the raw materials, and the raw materials are required to be uniformly mixed, so that the qualified quality of the medicines can be ensured.

However, the existing multi-directional movement mixing machine inner container mixing and stirring device also has the problems that the overturning effect on the bottom of the material is poor, and the reverse stirring rod cannot be tightly attached to the side wall to rotate and discharge materials, so that the problem of labor is solved.

Therefore, the invention provides a mixing and stirring device for an inner container of a multidirectional moving mixer, which is convenient to maintain.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a multidirectional motion mixes quick-witted inner bag compounding agitating unit convenient to maintain to solve the current multidirectional motion and mix quick-witted inner bag compounding agitating unit and to the relatively poor, the reverse stirring pole of upset effect of material bottom and can not hug closely the problem that the lateral wall is rotatory and the ejection of compact time is harder.

A conveniently maintained liner mixing and stirring device of a multidirectional motion mixer comprises a bottom plate, a supporting frame, a stirring box, a bottom turnover frame structure, a fixed plate, a movable turnover frame structure, a box cover, a rotating shaft, a side stirring frame structure, a mounting frame, a forward rotation motor, a feeding cover, a discharging hopper, a discharging cover and a movable motor, wherein the supporting frame is welded at the front end and the rear end of the upper part of the bottom plate respectively; the stirring box is arranged on the inner side of the supporting frame; the bottom roll-over stand structure is arranged at the lower part of the inner side of the stirring box; the fixed plates are respectively connected to the left side and the right side of the upper part of the bottom plate through bolts; the movable roll-over stand structure is arranged on the inner side of the fixed plate; the box cover is connected to the upper part of the stirring box through bolts; the rotating shaft is axially connected to the middle position of the inner side of the box cover; the side surface stirring frame structures are respectively arranged at the left side and the right side in the stirring box; the mounting frame is connected to the upper part of the box cover through bolts; the forward rotation motor is connected to the inner side of the mounting frame through bolts, and an output shaft is connected with an upper flange of the rotating shaft; the feeding cover is connected to the left side of the upper part of the box cover through a hinge; the lower part of the discharge hopper is welded at the right upper part of the inner side of the box cover; the discharging cover hinge is connected to the upper part of the discharging hopper; the moving motor is connected to the left side of the fixing plate through a bolt, and an output shaft penetrates through the fixing plate; the bottom turning frame structure comprises a reverse motor, a transmission shaft, a cross rod, a bevel gear, a gear ring and a turning screen plate, wherein the transmission shaft is connected with an output shaft coupler of the reverse motor; the cross rods are respectively connected to the left side and the right side of the upper part of the transmission shaft in a shaft manner; the bevel gear is connected to the position of the cross rod away from the transmission shaft through a key; the gear ring is sleeved on the outer side of the transmission shaft; the turnover screen plates are respectively connected to the upper part and the lower part of the cross rod through bolts.

Preferably, the side stirring frame structure comprises an inner wall scraper, a pore plate, a rotating pipe, a transmission rod, a compression spring and a baffle plate, wherein the pore plate is welded on the right side of the inner wall scraper; the rotating pipe is axially connected to the inner side of the orifice plate; the transmission rod is inserted at the upper part of the inner side of the rotating pipe; the compression spring is sleeved at the upper part of the outer side of the transmission rod; the baffle is connected to the upper part of the outer side of the transmission rod through bolts.

Preferably, the movable roll-over stand structure comprises a threaded rod, a threaded pipe, a fixed pipe, a reinforcing plate, a telescopic rod and an ear plate, wherein the threaded pipe is in threaded connection with the right side of the outer part of the threaded rod; the fixed pipe is welded at the front end of the threaded pipe; the reinforcing plate is welded at the included angle of the threaded pipe and the fixed pipe; the telescopic rod is inserted into the upper part of the inner side of the fixed pipe; the ear plate is coupled to the upper part of the telescopic rod.

Preferably, the mounting bracket be provided with two, bolted connection is in the left and right sides of corotation motor respectively, the feed cover set up the left side at the mounting bracket, the play hopper set up the right side at the mounting bracket.

Preferably, the reverse motor is bolted to the middle of the lower part of the stirring box, the output shaft penetrates through the lower part of the inner side of the stirring box, and the reverse motor is arranged on the left side of the lug plate.

Preferably, the transmission shaft is arranged in the middle of the bottom of the inner side of the stirring box, the gear ring is connected to the lower portion of the inner side of the stirring box through a screw, and the bevel gear and the gear ring are meshed with each other.

Preferably, the upper part of the transmission rod is in shaft connection with the lower part of the rotating shaft, the transmission rod is respectively arranged on the left side and the right side of the lower part of the rotating shaft, and the inner wall scrapers are tightly attached to the left side and the right side of the inner part of the stirring box.

Preferably, the threaded rod is connected to the inner side of the fixed plate, and the left side of the threaded rod is connected with an output shaft coupling of the moving motor.

Preferably, the ear plate is welded on the right side of the lower part of the stirring box, and the threaded pipe, the fixed pipe, the reinforcing plate and the telescopic rod are respectively arranged on the lower part of the right side of the reverse rotation motor.

Preferably, the bevel gear, the gear ring and the turnover screen plate are respectively arranged at the lower part of the inner wall scraper.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses in, bevel gear, ring gear and the setting of upset otter board, be favorable to making the horizontal pole when using the transmission shaft as centre of a circle horizontal rotation to self axis is rotatory as the centre of a circle, overturns the bottom of material after combining with the upset otter board, thereby improves the device to the upset effect of material bottom.

2. The utility model discloses in, the setting of reversal motor, transmission shaft and horizontal pole, be favorable to stirring and upset the bottom of material to the reversal of horizontal pole cooperates with the corotation of inner wall scraper blade, improves the stirring effect to the material, thereby improves the device and mixes the function to the stirring of material.

3. The utility model discloses in, the setting of rotatory pipe, transfer line, compression spring and baffle, be favorable to promoting the rotatory pipe through compression spring self and remove, make the rotatory pipe hug closely the inner wall scraper blade on the inner wall of agitator tank to scrape the material on the inner wall of agitator tank and get.

4. The utility model discloses in, the setting of inner wall scraper blade, orifice plate, corotation motor and rotation axis, be favorable to driving inner wall scraper blade horizontal rotation through rotatory pipe and transfer line to cooperation reversal motor, transmission shaft and horizontal pole are mixxed the material, guarantee that the material receives multi-direction rotation, and then improve and mix the effect.

5. The utility model discloses in, the setting of threaded rod, screwed pipe and otic placode, the lower part that is favorable to driving the agitator tank removes to the left side, makes the agitator tank transversely set up to make things convenient for the staff to clear up the inboard of agitator tank, and maintain the part of agitator tank inboard.

6. The utility model discloses in, the setting of fixed pipe and telescopic link, be favorable to cooperating threaded rod and screwed pipe lateral shifting, turn into pitch arc motion with the motion from linear motion to rotate the agitator tank, make the agitator tank transversely set up, do not influence the normal work of reversal motor simultaneously.

7. The utility model discloses in, the setting of gusset plate, be favorable to consolidating the junction of screwed pipe and fixed pipe, when preventing that the screwed pipe from driving fixed pipe lateral shifting for a long time, the damage appears in the junction to extension screwed pipe and fixed pipe life.

8. The utility model discloses in, feeding lid, play hopper and ejection of compact lid set up, be favorable to sealing up the inboard of agitator tank, prevent to mix the in-process of mixing the material and sneak into other debris such as dust, influence the quality of compounding, and then improve the processingquality of this equipment.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the bottom roll-over stand structure of the present invention.

Fig. 3 is a schematic structural diagram of the side stirring frame structure of the present invention.

Fig. 4 is a schematic structural view of the movable roll-over stand structure of the present invention.

In the figure:

1. a base plate; 2. a support frame; 3. a stirring box; 4. a bottom roll-over stand structure; 41. a reverse motor; 42. a drive shaft; 43. a cross bar; 44. a bevel gear; 45. a ring gear; 46. turning over the screen plate; 5. a fixing plate; 6. moving the roll-over stand structure; 61. a threaded rod; 62. a threaded pipe; 63. a fixed tube; 64. a reinforcing plate; 65. a telescopic rod; 66. an ear plate; 7. a box cover; 8. a rotating shaft; 9. a side agitating frame structure; 91. an inner wall scraper; 92. an orifice plate; 93. rotating the tube; 94. a transmission rod; 95. a compression spring; 96. a baffle plate; 10. a mounting frame; 11. a forward rotation motor; 12. a feeding cover; 13. a discharge hopper; 14. a discharging cover; 15. the motor is moved.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example (b):

as shown in fig. 1 and 2, the mixing and stirring device for the liner of the multi-directional motion mixer convenient to maintain comprises a bottom plate 1, a support frame 2, a stirring box 3, a bottom roll-over stand structure 4, a fixing plate 5, a movable roll-over stand structure 6, a box cover 7, a rotating shaft 8, a side roll-over stand structure 9, a mounting frame 10, a forward rotation motor 11, a feeding cover 12, a discharging hopper 13, a discharging cover 14 and a moving motor 15, wherein the support frame 2 is welded at the front end and the rear end of the upper part of the bottom plate 1 respectively; the stirring box 3 is arranged on the inner side of the support frame 2; the bottom roll-over stand structure 4 is arranged at the lower part of the inner side of the stirring box 3; the fixed plates 5 are respectively bolted on the left side and the right side of the upper part of the bottom plate 1; the movable roll-over stand structure 6 is arranged on the inner side of the fixed plate 5; the box cover 7 is connected to the upper part of the stirring box 3 through bolts; the rotating shaft 8 is coupled at the middle position of the inner side of the box cover 7; the side stirring frame structures 9 are respectively arranged at the left side and the right side in the stirring box 3; the mounting frame 10 is bolted on the upper part of the box cover 7; the forward rotation motor 11 is connected to the inner side of the mounting frame 10 through bolts, and an output shaft is connected with an upper flange of the rotating shaft 8; the feeding cover 12 is connected to the left side of the upper part of the box cover 7 through a hinge; the lower part of the discharge hopper 13 is welded at the right upper part of the inner side of the box cover 7; the discharging cover 14 is hinged to the upper part of the discharging hopper 13; the moving motor 15 is connected to the left side of the fixed plate 5 through a bolt, and an output shaft penetrates through the fixed plate 5; the bottom roll-over stand structure 4 comprises a reverse motor 41, a transmission shaft 42, a cross rod 43, a bevel gear 44, a gear ring 45 and a roll-over screen 46, wherein the transmission shaft 42 is connected with an output shaft coupling of the reverse motor 41; the cross rods 43 are respectively connected to the left side and the right side of the upper part of the transmission shaft 42 in a shaft mode; the bevel gear 44 is connected to the position of the cross rod 43 far away from the transmission shaft 42 in a key way; the gear ring 45 is sleeved on the outer side of the transmission shaft 42; the turnover screen plate 46 is respectively connected with the upper part and the lower part of the cross rod 43 through bolts; the reverse rotation motor 41 drives the cross rod 43 to rotate horizontally through the transmission shaft 42, and at the moment, the bevel gear 44 and the gear ring 45 are meshed with each other, so that the cross rod 43 drives the bevel gear 44 to rotate, and the bottom of the material is overturned in multiple directions.

In the above embodiment, as shown in fig. 3, specifically, the side agitating frame structure 9 includes an inner wall scraper 91, a hole plate 92, a rotary pipe 93, a transmission rod 94, a compression spring 95 and a baffle 96, wherein the hole plate 92 is welded to the right side of the inner wall scraper 91; the rotating pipe 93 is axially connected to the inner side of the orifice plate 92; the transmission rod 94 is inserted into the upper part of the inner side of the rotating pipe 93; the compression spring 95 is sleeved on the upper part of the outer side of the transmission rod 94; the baffle 96 is connected to the upper part of the outer side of the transmission rod 94 through bolts; the compression spring 95 pushes the rotary pipe 93 toward the lower left portion, and pushes the inner wall scraper 91 against the inner wall of the stirring tank 3 through the orifice plate 92, thereby rotationally stirring the inner wall of the stirring tank 3.

In the above embodiment, as shown in fig. 4, in particular, the movable roll-over stand structure 6 comprises a threaded rod 61, a threaded pipe 62, a fixed pipe 63, a reinforcing plate 64, a telescopic rod 65 and an ear plate 66, wherein the threaded pipe 62 is threaded on the outer right side of the threaded rod 61; the fixed pipe 63 is welded at the front end of the threaded pipe 62; the reinforcing plate 64 is welded at the included angle of the threaded pipe 62 and the fixed pipe 63; the telescopic rod 65 is inserted into the upper part of the inner side of the fixed pipe 63; the ear plate 66 is coupled to the upper part of the telescopic rod 65; the movable motor 15 drives the threaded rod 61 to rotate, the threaded pipe 62 drives the fixed pipe 63 and the telescopic rod 65 to move at the outer side transverse movement of the threaded rod 61, the telescopic rod 65 moves up and down at the inner side of the fixed pipe 63, and the bottom of the stirring box 3 driven by the lug plate 66 rotates leftwards, so that the stirring box 3 is transversely arranged, and the stirring box 3 is convenient for workers to maintain and repair the inner side of the stirring box 3.

In the above embodiment, specifically, two mounting frames 10 are provided, and are respectively bolted to the left and right sides of the forward rotation motor 11, the feeding cover 12 is provided on the left side of the mounting frame 10, and the discharging hopper 13 is provided on the right side of the mounting frame 10.

In the above embodiment, specifically, the reverse rotation motor 41 is bolted to the middle of the lower part of the stirring tank 3, the output shaft penetrates through the lower part of the inner side of the stirring tank 3, and the reverse rotation motor 41 is disposed on the left side of the lug plate 66.

In the above embodiment, specifically, the transmission shaft 42 is disposed at the middle position of the inner bottom of the stirring tank 3, the gear ring 45 is screwed to the inner lower portion of the stirring tank 3, and the bevel gear 44 and the gear ring 45 are engaged with each other.

In the above embodiment, the upper portion of the driving rod 94 is coupled to the lower portion of the rotating shaft 8, the driving rods 94 are respectively disposed at the left and right sides of the lower portion of the rotating shaft 8, and the inner wall scrapers 91 are closely attached to the left and right sides of the inside of the stirring box 3.

In the above embodiment, specifically, the threaded rod 61 is coupled to the inner side of the fixed plate 5, and the left side is coupled to the output shaft of the moving motor 15.

In the above embodiment, specifically, the ear plate 66 is welded to the right side of the lower portion of the stirring tank 3, and the threaded pipe 62, the fixed pipe 63, the reinforcing plate 64 and the telescopic rod 65 are respectively disposed at the lower right portion of the reverse rotation motor 41.

In the above embodiment, specifically, the bevel gear 44, the gear ring 45 and the flip-up screen 46 are respectively disposed at the lower portion of the inner wall scraper 91.

Principle of operation

The utility model discloses a theory of operation: when the stirring device is used, the feeding cover 12 is opened, materials to be mixed are poured into the inner side of the stirring box 3, then the feeding cover 12 is closed, the forward rotation motor 11 and the reverse rotation motor 41 are respectively started, the forward rotation motor 11 drives the transmission rod 94 to rotate through the rotating shaft 8, the transmission rod 94 drives the inner wall scraper 91 to rotate through the rotating pipe 93 to stir the materials, meanwhile, the compression spring 95 pushes the rotating pipe 93 to the outer lower part, the inner wall scraper 91 is pushed to be tightly attached to the inner wall of the stirring box 3 through the pore plate 92 to rotationally stir the inner wall of the stirring box 3, the reverse rotation motor 41 drives the cross rod 43 to horizontally rotate through the transmission shaft 42, the bevel gear 44 is meshed with the gear ring 45 at the moment, the bevel gear 44 is driven to rotate through the cross rod 43 to turn over the bottoms of the materials in multiple directions, after the materials are mixed, the moving motor 15 is started, the moving motor 15 drives the threaded rod 61 to rotate, and the threaded pipe 62 transversely moves on the outer side of the threaded rod 61, drive fixed pipe 63 and telescopic link 65 simultaneously and remove, telescopic link 65 reciprocates in the inboard of fixed pipe 63, and the bottom that drives agitator tank 3 through otic placode 66 is rotatory to the left side, make agitator tank 3 transversely set up, place the collecting box on the lower part right side of play hopper 13, open discharge cover 14, the material flows out from play hopper 13 through inner wall scraper blade 91's stirring, when maintaining this equipment, guarantee agitator tank 3 and transversely set up, pull down the bolt of case lid 7 and agitator tank 3 junction, take off case lid 7 again, make things convenient for the staff to maintain agitator tank 3's inboard.

Utilize technical scheme, or technical personnel in the field are in the utility model discloses under technical scheme's the inspiration, design similar technical scheme, and reach above-mentioned technological effect, all fall into the utility model discloses a protection scope.

Claims

1. The inner container mixing and stirring device of the multidirectional motion mixer convenient to maintain is characterized by comprising a bottom plate (1), a support frame (2), a stirring box (3), a bottom roll-over stand structure (4), a fixing plate (5), a movable roll-over stand structure (6), a box cover (7), a rotating shaft (8), a side face stirring stand structure (9), a mounting frame (10), a forward rotation motor (11), a feeding cover (12), a discharging hopper (13), a discharging cover (14) and a moving motor (15), wherein the support frame (2) is welded at the front end and the rear end of the upper portion of the bottom plate (1) respectively; the stirring box (3) is arranged on the inner side of the support frame (2); the bottom roll-over stand structure (4) is arranged at the lower part of the inner side of the stirring box (3); the fixed plates (5) are respectively connected to the left side and the right side of the upper part of the bottom plate (1) through bolts; the movable roll-over stand structure (6) is arranged on the inner side of the fixed plate (5); the box cover (7) is connected to the upper part of the stirring box (3) through bolts; the rotating shaft (8) is coupled to the middle position of the inner side of the box cover (7); the side stirring frame structures (9) are respectively arranged at the left side and the right side in the stirring box (3); the mounting frame (10) is connected to the upper part of the box cover (7) through bolts; the forward rotation motor (11) is connected to the inner side of the mounting frame (10) through bolts, and an output shaft is connected with an upper flange of the rotating shaft (8); the feeding cover (12) is hinged to the left side of the upper part of the box cover (7); the lower part of the discharge hopper (13) is welded at the right upper part of the inner side of the box cover (7); the discharging cover (14) is hinged to the upper part of the discharging hopper (13); the moving motor (15) is connected to the left side of the fixing plate (5) through a bolt, and an output shaft penetrates through the fixing plate (5); the bottom roll-over stand structure (4) comprises a reverse motor (41), a transmission shaft (42), a cross bar (43), a bevel gear (44), a gear ring (45) and a roll-over screen (46), wherein the transmission shaft (42) is connected with an output shaft coupling of the reverse motor (41); the cross rods (43) are respectively coupled to the left side and the right side of the upper part of the transmission shaft (42); the bevel gear (44) is connected to the position of the cross rod (43) far away from the transmission shaft (42) in a key way; the gear ring (45) is sleeved on the outer side of the transmission shaft (42); the turnover screen plate (46) is respectively connected to the upper part and the lower part of the cross rod (43) through bolts.

2. The easy-to-maintain liner mix agitation apparatus for a multidirectional motion mixer as defined in claim 1 wherein said side agitation rack structure (9) comprises an inner wall scraper (91), a perforated plate (92), a rotary tube (93), a driving rod (94), a compression spring (95) and a baffle (96), said perforated plate (92) being welded to the right side of said inner wall scraper (91); the rotating pipe (93) is coupled to the inner side of the orifice plate (92) in a shaft manner; the transmission rod (94) is inserted into the upper part of the inner side of the rotating pipe (93); the compression spring (95) is sleeved at the upper part of the outer side of the transmission rod (94); the baffle (96) is connected to the upper part of the outer side of the transmission rod (94) through bolts.

3. The easy-to-maintain multiple motion mixer liner mixing agitator of claim 1, wherein the movable roll-over stand structure (6) comprises a threaded rod (61), a threaded tube (62), a fixed tube (63), a reinforcing plate (64), a telescopic rod (65) and an ear plate (66), the threaded tube (62) is screwed to the outer right side of the threaded rod (61); the fixed pipe (63) is welded at the front end of the threaded pipe (62); the reinforcing plate (64) is welded at the included angle of the threaded pipe (62) and the fixed pipe (63); the telescopic rod (65) is inserted into the upper part of the inner side of the fixed pipe (63); the ear plate (66) is coupled to the upper part of the telescopic rod (65) in a shaft way.

4. The easy-to-maintain liner mixing and stirring device for a multidirectional motion mixer as defined in claim 1, wherein there are two mounting frames (10) bolted to the left and right sides of the forward rotation motor (11), the feeding cover (12) is disposed on the left side of the mounting frame (10), and the discharging hopper (13) is disposed on the right side of the mounting frame (10).

5. The easy-to-maintain liner mix stirring apparatus for a multidirectional motion mixer as set forth in claim 3, wherein said counter-rotating motor (41) is bolted to a lower middle portion of said stirring tank (3) and an output shaft penetrates through an inner lower portion of said stirring tank (3), said counter-rotating motor (41) being disposed on a left side of said ear plate (66).

6. The easy-to-maintain liner mixing and stirring device for a multidirectional motion mixer as defined in claim 1, wherein said drive shaft (42) is provided at a middle position of the inside bottom of said mixing tank (3), said ring gear (45) is screwed to the inside lower portion of said mixing tank (3), and said bevel gear (44) and said ring gear (45) are engaged with each other.

7. The easy-to-maintain liner mixing and stirring device for a multidirectional motion mixer as defined in claim 2, wherein the upper portion of said driving rod (94) is coupled to the lower portion of said rotating shaft (8), said driving rods (94) are respectively disposed at the left and right sides of the lower portion of said rotating shaft (8), and said inner wall scrapers (91) are closely attached to the left and right sides of the inside of said mixing box (3).

8. The maintenance-friendly liner mix stirring apparatus for a multidirectional moving mixer as set forth in claim 3, wherein said threaded rod (61) is coupled to an inner side of the fixed plate (5) and a left side is coupled to an output shaft of the moving motor (15).

9. The easy-to-maintain liner mixing and stirring device for a multidirectional motion mixer as defined in claim 3, wherein said ear plate (66) is welded to the right side of the lower portion of the mixing tank (3), and said screw tube (62), fixing tube (63), reinforcing plate (64) and telescopic rod (65) are respectively provided to the lower right portion of the counter-rotating motor (41).

10. The easy-to-maintain liner mixing and stirring device for a multidirectional motion mixer as set forth in claim 2, wherein said bevel gear (44), gear ring (45) and reverse screen (46) are provided respectively at the lower part of the inner wall scraper (91).