CN213103151U - Screening device - Google Patents

Abstract

The utility model relates to a screening plant. Comprises a lower case, an upper case and an eccentric driving mechanism; the upper case is provided with a screening inner cavity, and the upper case is provided with a feeding pipe; the screening device also comprises screening plates, and each layer of screening plate extends to the other side from one side in the screening inner cavity close to the transverse direction of the feeding pipe and is gradually arranged in an inclined manner from top to bottom in the extending process; the block screening plate comprises a supporting frame body and a screen, and a supporting piece is also arranged in the screening inner cavity of the lower case; the upper case is also provided with an open window, and the open window is connected with a movable opening and closing door; a discharging channel is arranged on the upper case; the eccentric driving mechanism comprises four groups of eccentric motion components; each group of eccentric motion components comprises an input rotating shaft, a driving turntable and an output rotating shaft; the utility model discloses can realize round the reciprocal translation motion of the central axis on same horizontal plane to the length of board to tealeaves is sieved evenly through sieving, but also has the advantage that the operation is stable, the noise is little.

Description

Screening device

Technical Field

The utility model relates to a tealeaves mechanical equipment is a screening plant very much.

Background

Tea leaf is in the in-process of production and processing, and essential step is that the length size specification of needs to tealeaves sieves the selection and do not, and vibrating sieving mechanism about current tealeaves screening sets up the many adoption, and this sieving mechanism can sieve the size of tealeaves, but hardly realizes carrying out even screening to the length of tealeaves, and current vibrating sieving mechanism still has the shortcoming that vibration frequency is fast, the noise is big moreover.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the utility model provides a screening plant, this screening plant can realize on same horizontal plane round the reciprocal translation motion of central axis to screen evenly through the length of screening the division board to tealeaves, but also have the advantage that the operation is stable, the noise is little.

The utility model discloses a following technical scheme realizes: a screening device, characterized in that: the device comprises a lower case, an upper case arranged above the lower case, and an eccentric driving mechanism which is in transmission connection between the lower case and the upper case and is used for driving the upper case to do reciprocating translational motion on the same horizontal plane around the vertical central line of the lower case;

a screening inner cavity is formed in the upper case, and a feeding pipe for feeding materials into the screening inner cavity is arranged above the part, close to the transverse side, of the top wall of the upper case;

the screening device also comprises more than two screening plates which are sequentially arranged in the screening inner cavity layer by layer from top to bottom, each layer of screening plate extends to the other side from one side in the screening inner cavity close to the transverse direction of the feeding pipe and is gradually inclined from top to bottom in the extending process; each screening plate comprises a supporting frame body and a screen connected in the supporting frame body, and the mesh aperture of the screen of the upper screening plate is larger than that of the screen of the lower screening plate; the side walls of the lower case at the two longitudinal sides of the screening inner cavity are provided with supporting pieces for supporting and fixing supporting frame bodies of the screening plates of all layers; an opening window which is used for taking and placing the screening plate and enables the screening inner cavity to be opened outwards is arranged on the lateral side wall of the upper case close to the transverse side of the feeding pipe, and a movable opening and closing door capable of opening and closing the opening window is movably connected to the opening window; a discharging channel which is correspondingly connected with the outlet of each layer of screening plate and is used for facilitating the discharging of the materials is arranged on the lateral wall of the other lateral side of the upper case;

the eccentric driving mechanism comprises four groups of eccentric motion components which are arranged between the bottom of the upper case and the top of the lower case and are close to four corners; each group of eccentric motion assemblies comprises an input rotating shaft vertically and rotatably connected to the lower case, a driving turntable coaxially and fixedly arranged on the free end of the upper part of the input rotating shaft, and an output rotating shaft arranged in parallel with the input rotating shaft; the lower end part of the output rotating shaft is rotationally connected with the eccentric position of the driving turntable, and the upper end part of the output rotating shaft is fixed with the bottom of the upper case; the eccentric driving mechanism also comprises a driving assembly for driving the input rotating shaft of each group of eccentric motion assemblies to synchronously rotate.

For better implementation of the scheme, the following optimization scheme is also provided:

preferably, the drive assembly comprises a drive shaft, a first transmission assembly, a second transmission assembly, and a drive motor; the driving shaft is arranged in parallel to the input rotating shafts of the eccentric motion assemblies and is rotatably connected to the lower case, the driving shaft is positioned at the cross point of diagonal connecting lines of the centers of the input rotating shafts of the four eccentric motion assemblies, the driving motor is fixedly arranged on the lower case, and the first transmission assembly comprises a first transmission wheel coaxially and fixedly arranged at the output shaft end of the driving motor, a second transmission wheel coaxially and fixedly arranged on the driving shaft and a first transmission belt in transmission connection between the first transmission wheel and the second transmission wheel;

the second transmission assembly comprises a third transmission wheel coaxially and fixedly arranged on the driving shaft, four fourth transmission wheels respectively coaxially and fixedly arranged at the lower end parts of the four input rotating shafts, and four second transmission belts respectively connected between the third transmission wheel and the corresponding fourth transmission wheels in a transmission manner.

In order to facilitate opening and closing of the movable opening and closing door, the lower end of the movable opening and closing door is movably hinged to the edge of the lower end of the open window through a hinge shaft extending along the horizontal longitudinal direction, the upper end of the movable opening and closing door is locked and fixed through more than one group of locking devices connected between the upper case and the movable opening and closing door, each group of locking devices comprises a locking screw rod arranged on the upper case and a connecting plate fixedly arranged on the movable opening and closing door, and the tail end of the locking screw rod is movably hinged to the edge, close to the movable opening and closing door, of the top of the upper case through the hinge shaft which is perpendicular to the locking screw; the locking device comprises a connecting plate, a movable opening and closing door and a locking screw rod, wherein the upper edge of the connecting plate is provided with a connecting notch at a position corresponding to and matched with the locking screw rod, when the movable opening and closing door is at a closed connecting position with an open window, the screw rod can turn to a position embedded in the connecting notch of the connecting plate around a hinge shaft of the screw rod, and the locking device further comprises a rotating hand wheel which is in threaded connection with the peripheral wall of the locking screw rod and can be pressed on the outer side wall of the connecting plate so that the connecting plate can be fixed on.

Preferably, screening plant's side still is equipped with and is used for conveniently carrying the material to carry out the loading attachment of material loading above the inlet pipe, the top of inlet pipe is arranged in to loading attachment's discharging pipe, be connected through the adapter sleeve of being made by soft deformable material between loading attachment's discharging pipe and the inlet pipe. The connecting sleeve can be a cloth sleeve or a hose and the like.

In order to facilitate the adsorption of impurities such as scrap iron and the like in the tea, a second open window which enables an inner cavity of the discharge pipe to be open outwards is formed in the outer peripheral wall of the discharge pipe of the feeding device, the screening device further comprises an arc opening and closing door which is movably hinged to the outer side wall of the discharge pipe and used for movably opening and closing the second open window, and a second locking device used for locking and fixing the arc opening and closing door on the discharge pipe;

the screening device further comprises a magnetic suction piece which is arranged in the discharge pipe and is arranged on the inner side wall of the arc opening and closing door, and a magnetic suction fixing frame which is used for fixedly connecting the magnetic suction piece is further arranged on the inner side wall of the arc opening and closing door.

Preferably, the magnetic part is in a vertical cylindrical shape, and the top of the magnetic part is provided with a cone which gradually shrinks from bottom to top towards the direction close to the axis.

In order to facilitate the opening and closing of the arc opening and closing door, a handle which is convenient to push and pull is also arranged on the outer side wall of the arc opening and closing door; the second locking device comprises a movable handle movably hinged on the arc-shaped opening and closing door through a vertically arranged rotating shaft, a second rotating shaft arranged in parallel with the rotating shaft and rotatably connected on the movable handle, a clasp piece fixedly connected on the second rotating shaft, and a clasp matching piece fixedly arranged on the pipe body of the discharge pipe and capable of being matched with and hooked on the clasp piece;

the two axial ends of the second rotating shaft respectively penetrate out of the upper side and the lower side of the movable handle, the clasp piece is in a U shape, two feet at the two U-shaped ends of the clasp piece are respectively and fixedly connected to the two axial ends of the second rotating shaft in a vertical mode, the whole U-shaped body of the clasp piece is bent along the outer peripheral shape of the discharge pipe, and the clasp matching piece comprises a hook body and a hook part, wherein the hook body is fixedly connected to the discharge pipe and located beside the movable handle, and the hook part is arranged on the hook body and bent in the direction away from the movable handle; the clasp piece can be hooked on the hook part of the clasp matching piece in the process of following the movable handle.

In order to facilitate the adjustment of the clasp, external threads are arranged on the peripheries of the U-shaped two-end pins of the clasp, the U-shaped two-end pins of the clasp are respectively arranged in through holes which are arranged at the two axial ends of the second rotating shaft in a penetrating mode, the second locking device further comprises two locking nut assemblies which are arranged on the U-shaped two-end pins of the clasp, each locking nut assembly comprises more than two locking nuts which are in threaded connection with the external threads of the U-shaped corresponding end pins of the clasp and can be locked and fixed outside the openings at the two axial ends of the corresponding through holes in a penetrating mode.

Compared with the prior art, the utility model has the advantages that:

1. the utility model relates to a screening plant, this screening plant can realize round the reciprocal translation motion of central axis on same horizontal plane to screening evenly is carried out to the length of tealeaves through the screening board, but also has the advantage that the operation is stable, the noise is little.

2. The utility model relates to a screening plant, the device's activity is opened and close the door and is carried out the closure through locking device and fix, and after the upset of activity was opened and close the door and is target in place, the screw rod is rotatable and the embedding connects in the connection breach of plate, and rotatory hand wheel on the lock last can guarantee that the activity is opened and close door ground and stably fix.

3. The utility model relates to a screening plant, wherein the top of inlet pipe is arranged in loading attachment's discharging pipe, and connects through the adapter sleeve that soft deformable material made between two pipes to guarantee the steady operation of last quick-witted case.

4. The utility model relates to a screening plant still is equipped with magnetism in the discharging pipe and inhales the piece and can get rid of the iron fillings impurity in the material.

5. The utility model relates to a screening plant, the arc on the discharging pipe is opened and close the door and is controlled the closure by second locking device, and this second locking device can be applicable to the switch of arc door.

6. The utility model relates to a screening plant still has convenient operation, simple structure and convenient to popularize and use's advantage.

Drawings

Fig. 1 is a schematic three-dimensional structure diagram of a screening device of the present invention;

fig. 2 is a schematic three-dimensional structure diagram of the sieving device for removing the movable opening and closing door of the utility model;

FIG. 3 is a schematic view of the structure of FIG. 2 with the screening plate removed;

fig. 4 is a vertical cross-sectional view of a screening device of the present invention;

fig. 5 is a schematic view of a transmission structure of a screening device according to the present invention;

fig. 6 is a schematic view of a transmission structure of a screening device according to the present invention;

fig. 7 is a schematic structural view of a screening plate in the screening device of the present invention;

FIG. 8 is an exploded view of a discharge tube, an arc-shaped opening/closing door, a magnetic attraction member, and a second locking device of the sieving device of the present invention;

FIG. 9 is an enlarged view of A in FIG. 1;

fig. 10 is an enlarged schematic view of B in fig. 1.

Description of reference numerals: 1-lower case, 2-upper case, 21-screening inner cavity, 22-open window, 23-supporting piece, 24-discharging channel, 3-eccentric driving mechanism, 31-eccentric motion component, 311-input shaft, 312-driving turntable, 313-output shaft, 32-driving component, 321-driving shaft, 322-first driving component, 3221-first driving wheel, 3222-second driving wheel, 3223-first driving belt, 323-second driving component, 3231-third driving wheel, 3232-fourth driving wheel, 3233-second driving belt, 324-driving motor, 4-feeding pipe, 5-screening plate, 51-supporting frame body, 52-screen, 6-locking device, 61-screw rod, 62-connecting plate piece, 621-connection notch, 63-rotary hand wheel, 64-hinge shaft, 7-discharge pipe, 71-second open window, 8-connecting sleeve, 9-arc opening and closing door, 91-magnetic suction fixing frame, 92-handle, a-movable opening and closing door, b-second locking device, b 1-rotating shaft, b 2-movable handle, b 3-second rotating shaft, b 4-clasp piece, b 5-hook part, b 6-locking nut component, c-magnetic suction piece and c 1-cone part.

Detailed Description

The invention is explained in detail below with reference to the accompanying drawings:

as shown in figures 1 to 10, a screening device characterised by: the device comprises a lower case 1, an upper case 2 arranged above the lower case 1, and an eccentric driving mechanism 3 which is in transmission connection between the lower case 1 and the upper case 2 and is used for driving the upper case 2 to do reciprocating translational motion on the same horizontal plane around the vertical central line of the lower case 1;

a screening inner cavity 21 is formed in the upper case 2, and a feeding pipe 4 for inputting materials into the screening inner cavity 21 is arranged above the part, close to the transverse side, of the top wall of the upper case 2;

the screening device also comprises more than two screening plates 5 which are sequentially arranged in the screening inner cavity 21 layer by layer from top to bottom, wherein each layer of screening plate 5 extends from one side of the screening inner cavity 21 close to the transverse direction of the feeding pipe 4 to the other side of the screening inner cavity and is gradually inclined from top to bottom in the extending process; each screening plate 5 comprises a supporting frame body 51 and a screen 52 connected in the supporting frame body 51, and the mesh aperture of the screen 52 of the screening plate 5 positioned on the upper layer is larger than that of the screen 52 of the screening plate 5 positioned on the lower layer; the side walls of the lower case 1 at the two longitudinal sides of the screening inner cavity 21 are provided with supporting pieces 23 for supporting and fixing supporting frame bodies 51 of the screening plates 5; an open window 22 which is used for taking and placing the screening plate 5 and enables the screening inner cavity 21 to be open outwards is arranged on the lateral side wall of the upper case 2 close to the feeding pipe 4, and a movable opening and closing door a capable of opening and closing the open window 22 is movably connected to the open window 22; a discharging channel 24 which is correspondingly connected with the outlet position of each layer of screening plate 5 and is used for facilitating the discharging of the materials is arranged on the lateral wall of the other lateral side of the upper case 2;

the eccentric driving mechanism 3 comprises four groups of eccentric motion assemblies 31 which are arranged between the bottom of the upper case 2 and the top of the lower case 1 and are close to four angular positions; each group of eccentric motion components 31 comprises an input rotating shaft 311 vertically and rotatably connected on the lower case 1, a driving turntable 312 coaxially and fixedly installed on the upper free end of the input rotating shaft 311, and an output rotating shaft 313 arranged in parallel with the input rotating shaft 311; the lower end part of the output rotating shaft 313 is rotationally connected with the eccentric position of the driving turntable 312, and the upper end part of the output rotating shaft 313 is fixed with the bottom part of the upper case 2; the eccentric driving mechanism 3 further comprises a driving assembly 32 for driving the input rotating shaft 311 of each set of eccentric moving assemblies 31 to rotate synchronously.

For better implementation of the scheme, the following optimization scheme is also provided:

preferably, the driving assembly 32 includes a driving shaft 321, a first transmission assembly 322, a second transmission assembly 323, and a driving motor 324; the driving shaft 321 is arranged parallel to the input rotating shafts 311 of the sets of eccentric moving components 31 and is rotatably connected to the lower chassis 1, the driving shaft 321 is located at a cross point of a diagonal line of centers of the input rotating shafts 311 of the four sets of eccentric moving components 31, the driving motor 324 is fixedly mounted on the lower chassis 1, the first transmission component 322 comprises a first transmission wheel 3221 coaxially and fixedly mounted on an output shaft end of the driving motor 324, a second transmission wheel 3222 coaxially and fixedly mounted on the driving shaft 321, and a first transmission belt 3223 in transmission connection between the first transmission wheel 3221 and the second transmission wheel 3222;

the second transmission assembly 323 comprises a third transmission wheel 3231 coaxially and fixedly arranged on the driving shaft 321, four fourth transmission wheels 3232 respectively coaxially and fixedly arranged on the lower end parts of the four input rotating shafts 311, and four second transmission belts 3233 respectively connected between the third transmission wheel 3231 and the corresponding fourth transmission wheels 3232 in a transmission manner.

In order to facilitate opening and closing of the movable opening and closing door, the lower end of the movable opening and closing door a is movably hinged to the edge of the lower end of the open window 22 through a hinge shaft extending along the horizontal longitudinal direction, the upper end of the movable opening and closing door a is locked and fixed through more than one group of locking devices 6 connected between the upper case 2 and the movable opening and closing door a, each group of locking devices 6 comprises a locking screw 61 arranged on the upper case 2 and a connecting plate 62 fixedly arranged on the movable opening and closing door a, and the tail end of the locking screw 61 is movably hinged to the edge, close to the movable opening and closing door a, of the top of the upper case 2 through a hinge shaft 64 which is perpendicular to the locking screw and extends; the upper edge of said connecting plate 62 is provided with a connecting notch 621 at a position corresponding to the locking screw 61, when the movable opening and closing door a is in the closed connection position with the open window 22, said screw 61 can be turned around its hinge axis 64 to a position embedded in the connecting notch 621 of said connecting plate 62, said locking device 6 further comprises a rotating hand wheel 63 screwed on the peripheral wall of the locking screw 61 and capable of pressing against the outer side wall of the connecting plate 62 so that said connecting plate 62 can be fixed on the upper case 2.

Preferably, screening plant's side still is equipped with and is used for conveniently carrying the material to carry the loading attachment that the inlet pipe 4 top carried out the material loading, the top of inlet pipe 4 is arranged in to loading attachment's discharging pipe 7, be connected through the adapter sleeve 8 of being made by soft deformable material between loading attachment's discharging pipe 7 and the inlet pipe 4. The connecting sleeve 8 can be a cloth sleeve or a hose and the like.

In order to facilitate the adsorption of impurities such as scrap iron and the like in the tea, a second open window 71 which enables an inner cavity of the discharge pipe 7 to be open outwards is formed in the outer peripheral wall of the discharge pipe 7 of the feeding device, and the screening device further comprises an arc opening and closing door 9 which is movably hinged to the outer side wall of the discharge pipe 7 and used for movably opening and closing the second open window 71 and a second locking device b used for locking and fixing the arc opening and closing door 9 on the discharge pipe 7;

screening plant still inhales a piece c including setting up in discharging pipe 7 and installing on the inside wall of arc opening and closing door 9, still is equipped with the magnetism that is used for fixed connection to inhale a piece c and inhales mount 91 on the inside wall of arc opening and closing door 9.

Preferably, the magnetic part c is in a vertical column shape, and a taper part c1 that gradually decreases from bottom to top in the direction approaching the axis is arranged at the top of the magnetic part c.

In order to facilitate opening and closing of the arc opening and closing door, a handle 92 which is convenient to push and pull is further arranged on the outer side wall of the arc opening and closing door 9; the second locking device b comprises a movable handle b2 movably hinged on the arc-shaped opening and closing door 9 through a vertically arranged rotating shaft b1, a second rotating shaft b3 arranged parallel to the rotating shaft b1 and rotatably connected to the movable handle b2, a clasp b4 fixedly connected to the second rotating shaft b3, and a clasp matching piece fixedly arranged on the pipe body of the discharge pipe 7 and capable of being matched and hooked with the clasp b 4;

the two axial ends of the second rotating shaft b3 respectively penetrate through the upper side and the lower side of the movable handle b2, the clasp piece b4 is in a U shape, the two ends of the U shape of the clasp piece b4 are respectively and fixedly connected to the two axial ends of the second rotating shaft b3, the whole U shape of the clasp piece b4 is bent along the outer peripheral shape of the discharge pipe 7, and the clasp matching piece comprises a hook body fixedly connected to the discharge pipe 7 and located beside the movable handle b2 and a hook part b5 arranged on the hook body and bent in the direction away from the movable handle b 2; the clip b4 is hook-connected to the hook b5 of the clip fitting during the movement following the movable handle b 2.

In order to adjust the hook, the outer periphery of the U-shaped two end legs of the hook b4 is provided with external threads, and the two end legs of the hook b4U are respectively inserted into through holes located at two axial ends of the second rotating shaft b3, and the second locking device b further includes two sets of locking nut assemblies b6 arranged on the U-shaped two end legs of the hook b4, and each set of locking nut assemblies b6 includes more than two locking nuts which are screwed on the external threads of the U-shaped corresponding end legs of the hook b4 and can be locked and fixed outside openings at two axial ends of the corresponding through holes.

While the present invention has been shown and described with reference to particular embodiments and alternatives thereof, it will be understood that various changes and modifications can be made without departing from the spirit and scope of the invention. It is understood, therefore, that the invention is not to be limited, except as by the appended claims and their equivalents.

Claims (8)

1. A screening device, characterized in that: comprises a lower case (1), an upper case (2) arranged above the lower case (1), and an eccentric driving mechanism (3) which is connected between the lower case (1) and the upper case (2) in a transmission way and is used for driving the upper case (2) to do reciprocating translational motion on the same horizontal plane around the vertical central line of the lower case (1);

a screening inner cavity (21) is formed in the upper case (2), and a feeding pipe (4) for inputting materials into the screening inner cavity (21) is arranged above the part, close to the transverse side, of the top wall of the upper case (2);

the screening device also comprises more than two screening plates (5) which are sequentially arranged in the screening inner cavity (21) layer by layer from top to bottom, wherein each layer of screening plate (5) extends to the other side from one side of the screening inner cavity (21) close to the transverse direction of the feeding pipe (4) and is gradually inclined from top to bottom in the extending process; each screening plate (5) comprises a supporting frame body (51) and a screen (52) connected in the supporting frame body (51), and the mesh aperture of the screen (52) of the screening plate (5) positioned on the upper layer is larger than that of the screen (52) of the screening plate (5) positioned on the lower layer; the side walls of the lower case (1) at the two longitudinal sides of the screening inner cavity (21) are provided with supporting pieces (23) for supporting and fixing supporting frame bodies (51) of the screening plates (5); an opening window (22) which is used for opening the screening inner cavity (21) outwards and is used for taking and placing the screening plate (5) is arranged on the lateral side wall of the upper case (2) close to the feeding pipe (4), and a movable opening and closing door (a) capable of opening and closing the opening window (22) is movably connected to the opening window (22); a discharging channel (24) which is correspondingly connected with the outlet of each layer of screening plate (5) and is used for facilitating the discharging of the materials is arranged on the lateral wall of the other lateral side of the upper case (2);

the eccentric driving mechanism (3) comprises four groups of eccentric motion assemblies (31) which are arranged between the bottom of the upper case (2) and the top of the lower case (1) and are close to four angular positions; each group of eccentric motion components (31) comprises an input rotating shaft (311) which is vertically and rotatably connected on the lower case (1), a driving turntable (312) which is coaxially and fixedly arranged on the free end of the upper part of the input rotating shaft (311), and an output rotating shaft (313) which is parallel to the input rotating shaft (311); the lower end part of the output rotating shaft (313) is rotationally connected with the eccentric position of the driving turntable (312), and the upper end part of the output rotating shaft (313) is fixed with the bottom of the upper case (2); the eccentric driving mechanism (3) also comprises a driving component (32) which is used for driving the input rotating shaft (311) of each group of eccentric motion components (31) to synchronously rotate.

2. A screening device according to claim 1, wherein: the driving assembly (32) comprises a driving shaft (321), a first transmission assembly (322), a second transmission assembly (323) and a driving motor (324); the driving shaft (321) is arranged in parallel to the input rotating shafts (311) of the eccentric motion assemblies (31) and is rotatably connected to the lower case (1), the driving shaft (321) is positioned at the intersection of diagonal lines of the centers of the input rotating shafts (311) of the four eccentric motion assemblies (31), the driving motor (324) is fixedly installed on the lower case (1), and the first transmission assembly (322) comprises a first transmission wheel (3221) coaxially and fixedly installed at the output shaft end of the driving motor (324), a second transmission wheel (3222) coaxially and fixedly installed on the driving shaft (321), and a first transmission belt (3223) in transmission connection between the first transmission wheel (3221) and the second transmission wheel (3222);

the second transmission assembly (323) comprises a third transmission wheel (3231) coaxially and fixedly arranged on the driving shaft (321), four fourth transmission wheels (3232) respectively coaxially and fixedly arranged on the lower end parts of the four input rotating shafts (311), and four second transmission belts (3233) respectively connected between the third transmission wheel (3231) and the corresponding fourth transmission wheels (3232) in a transmission manner.

3. A screening device according to claim 1, wherein: the lower end of the movable opening and closing door (a) is movably hinged to the edge of the lower end of the open window (22) through a hinge shaft extending along the horizontal longitudinal direction, the upper end of the movable opening and closing door (a) is locked and fixed through more than one group of locking devices (6) connected between the upper case (2) and the movable opening and closing door (a), each group of locking devices (6) comprises a locking screw rod (61) arranged on the upper case (2) and a connecting plate (62) fixedly arranged on the movable opening and closing door (a), and the tail end of each locking screw rod (61) is movably hinged to the edge, close to the movable opening and closing door (a), of the top of the upper case (2) through a hinge shaft (64) which is perpendicular to the locking screw rod and extends along the longitudinal direction; the upper edge of the connecting plate piece (62) is provided with a connecting notch (621) at a position corresponding to the matching position of the locking screw rod (61), when the movable opening and closing door (a) is at a closed connecting position with the open window (22), the screw rod (61) can turn around a hinge shaft (64) to a position embedded in the connecting notch (621) of the connecting plate piece (62), and the locking device (6) further comprises a rotating hand wheel (63) which is in threaded connection with the peripheral wall of the locking screw rod (61) and can be pressed against the outer side wall of the connecting plate piece (62) so that the connecting plate piece (62) can be fixed on the upper case (2).

4. A screening device according to claim 1, wherein: screening plant's side still is equipped with and is used for conveniently carrying the material to carry the loading attachment that inlet pipe (4) top carried out the material loading, the top of inlet pipe (4) is arranged in feeding device's discharging pipe (7), be connected through adapter sleeve (8) of being made by soft deformable material between feeding device's discharging pipe (7) and inlet pipe (4).

5. A screening device according to claim 4, wherein: a second open window (71) which enables an inner cavity of the discharge pipe (7) to be open outwards is formed in the outer peripheral wall of the discharge pipe (7) of the feeding device, and the screening device further comprises an arc opening and closing door (9) which is movably hinged to the outer side wall of the discharge pipe (7) and used for movably opening and closing the second open window (71), and a second locking device (b) which is used for locking and fixing the arc opening and closing door (9) on the discharge pipe (7);

screening plant still inhales piece (c) including setting up in discharging pipe (7) and installing on arc open and close door (9) inside wall, still is equipped with on arc open and close door (9) inside wall and is used for the magnetism of fixed connection to inhale mount (91) of piece (c).

6. A screening device according to claim 5, wherein: the magnetic part (c) is vertically cylindrical, and the top of the magnetic part (c) is provided with a cone part (c1) which gradually shrinks from bottom to top to the direction close to the axis.

7. A screening device according to claim 5, wherein: the outer side wall of the arc opening and closing door (9) is also provided with a handle (92) which is convenient to push and pull; the second locking device (b) comprises a movable handle (b2) movably hinged on the arc-shaped opening and closing door (9) through a vertically arranged rotating shaft (b1), a second rotating shaft (b3) which is arranged in parallel to the rotating shaft (b1) and is rotatably connected to the movable handle (b2), a hook piece (b4) fixedly connected to the second rotating shaft (b3), and a hook fitting piece which is fixedly arranged on the pipe body of the discharge pipe (7) and can be matched with and hooked by the hook piece (b 4);

the two axial ends of the second rotating shaft (b3) respectively penetrate out of the upper side and the lower side of the movable handle (b2), the clasp piece (b4) is in a U shape, the two ends of the U shape of the clasp piece (b4) are respectively and fixedly connected to the two axial ends of the second rotating shaft (b3) in a vertical mode, the whole U shape of the clasp piece (b4) is bent along the peripheral shape of the discharge pipe (7), and the clasp matching piece comprises a hook body fixedly connected to the discharge pipe (7) and located beside the movable handle (b2) and a hook portion (b5) arranged on the hook body and bent in a direction away from the movable handle (b 2); the hook piece (b4) can be hooked on the hook part (b5) of the hook fitting piece in the process of following the movement of the movable handle (b 2).

8. A screening device according to claim 7, wherein: the periphery of the U-shaped two-end pin of the clasp (b4) is provided with external threads, the U-shaped two-end pin of the clasp (b4) is respectively penetrated in through holes positioned at the two axial ends of the second rotating shaft (b3), the second locking device (b) further comprises two locking nut assemblies (b6) which are arranged on the U-shaped two-end pin of the clasp (b4), and each locking nut assembly (b6) comprises more than two locking nuts which are in threaded connection with the external threads of the U-shaped corresponding end pin of the clasp (b4) and can be locked and fixed outside the openings at the two axial ends of the corresponding through hole.

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