CN118558596B

CN118558596B - Seed screening drying device for forestry planting

Info

Publication number: CN118558596B
Application number: CN202411049589.4A
Authority: CN
Inventors: 李翔飞; 王淑惠; 吕少杰; 杨晓燕; 孙超; 赵莹; 林永军; 李琳
Original assignee: Yantai Huaer Horticultural Technology Co ltd
Current assignee: Yantai Huaer Horticultural Technology Co ltd
Priority date: 2024-08-01
Filing date: 2024-08-01
Publication date: 2024-09-24
Anticipated expiration: 2044-08-01
Also published as: CN118558596A

Abstract

The invention relates to the technical field of screening, and discloses a seed screening and drying device for forestry planting, which comprises a base and a frame arranged on the base, wherein the frame is connected with a screen box through a plurality of groups of buffer springs, the screen box is in an inclined downward design, and a vibrating motor is arranged at the bottom end of the screen box. This forestry is planted and is used seed screening drying device utilizes screening guipure as the screen cloth, and the different positions of screening guipure are sieved the seed of different particle diameters, through the position of adjustment screening guipure, sieves to various seeds.

Description

Seed screening drying device for forestry planting

Technical Field

The invention relates to the technical field of screening, in particular to a seed screening and drying device for forestry planting.

Background

In the forestry planting process, the forestry seeds that need to plant are classified according to the size of particle diameter to obtain the seed of different qualities, screen through the seed sieve separator, the seed sieve separator is mostly all through modes such as vibrations, and cooperates the filter screen to clear away some foreign matters, for example leaf and branch etc. to the separation of seed and foreign matter has been reached.

At present, the seed screening machine screens seeds in a vibration mode, but the sizes of the seeds of different varieties of plants are different, so that the seed screening machine needs to screen the seeds of various plants, the screen mesh on the current seed screening machine can not screen the seeds with different particle sizes, and therefore, the seed screening and drying device for forestry planting is provided.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a seed screening and drying device for forestry planting, solves the problem of seed screening with different particle sizes, and can adjust a screen according to different seeds to finish the aim of sorting different seeds.

The invention provides the following technical scheme: the seed screening and drying device for forestry planting comprises a base and a frame arranged on the base, wherein the frame is connected with a screen box through a plurality of groups of buffer springs, the screen box is obliquely downwards designed, and a vibrating motor is arranged at the bottom end of the screen box;

The screening box comprises a box frame with a U-shaped section, two groups of double rollers which are vertically and symmetrically distributed are arranged at the front end of the inside of the box frame, two guide rollers which are vertically and symmetrically distributed are arranged at the tail end of the inside of the box frame, supporting beams are arranged on two sides of the inner wall of the box frame, a plurality of groups of rotatable rollers are arranged between the two supporting beams, rotatable transmission rollers are arranged in the box frame below the rollers, screening mesh belts are paved on the rollers, are redirected through the two guide rollers and bypass through the plurality of groups of transmission rollers, and two ends of the screening mesh belts are led out through the two groups of double rollers;

The screening net belt is formed by connecting a plurality of screens with different apertures, two ends of the screening net belt pass through the two supporting beams, two sides of the inside of the box frame are respectively provided with a pressing mechanism, and the two ends of the screening net belt are pressed on the two supporting beams through the pressing mechanisms;

The inside of the box frame is provided with a guide plate positioned between the screening mesh belts, the bottom of the side surface of the box frame is provided with a discharge chute used for discharging the guide plate, and seeds fall on the guide plate and are discharged through the discharge chute after being sorted by the screening mesh belts;

The base is provided with a movable seat positioned at the front end of the screen box, the top end of the movable seat is provided with a winding box, a winding and unwinding assembly used for conveying the screening mesh belt is arranged in the winding box, the screening mesh belt is wound and unwound through the winding and unwinding assembly in the winding box, and the aperture size of the screening mesh belt is adjusted;

The movable seat is in sliding connection with the base through a sliding rail, and is pushed by the electric cylinder to slide on the base;

the front end of the screen box is provided with a hopper, the screen box is provided with a drying mechanism for heating and drying the hopper, and the drying mechanism can dry the seeds led out from the hopper by hot air and lead out impurities in the seeds.

Preferably, the frame comprises a plurality of groups of brackets which are H-shaped from high to low, and the bottom and two sides of the screen box are connected with the plurality of groups of brackets through buffer springs.

Preferably, the guide plate comprises a plate body parallel to the bottom of the box frame and a chute connected to the tail end of the plate body, and seeds falling onto the plate body after screening slide into the chute along the inclined plane of the plate body and are guided out of the discharge chute under the inclined plane of the chute.

Preferably, the hold-down mechanism is including installing the support bar at the box frame inner wall, the top of support bar is the inclined plane, and the bottom of support bar is equipped with the notch that runs through, be equipped with a plurality of groups of gliding compact heap from top to bottom in the notch, and the both sides of compact heap are equipped with spout and slider respectively, and pass through spout and slider sliding connection each other between the compact heap, the internally mounted of support bar has a plurality of groups to be used for driving the compact heap and moves down the flexible section of thick bamboo that compresses tightly the screening guipure, install the pneumatic system that is used for driving flexible section of thick bamboo in the movable seat.

Preferably, the telescopic cylinder comprises a cylinder body arranged in a notch at the bottom of the supporting bar, the bottom end of the cylinder body is provided with a positioning ring, a slidable piston is arranged in the cylinder body, the bottom end of the piston is provided with a movable rod, the bottom end of the movable rod is led out of the positioning ring and is connected with the connecting block, the top end of the compressing block is provided with a circular groove, the telescopic cylinder is hidden in the circular groove of the compressing block, and the connecting block is arranged at the bottom end of the circular groove of the compressing block.

Preferably, the pneumatic system comprises a shunt tube arranged in the support bar, the shunt tube conveys gas into each cylinder body through a pipeline, the shunt tube is led into the movable seat through a connecting pipe and is connected with an A three-way valve, the A three-way valve is connected with an air outlet of an air pump through a pipeline, an A exhaust pipe is arranged at the other interface of the A three-way valve, an air inlet pipe of the air pump is connected with a B three-way valve through a pipeline, a B exhaust pipe is arranged at the other interface of the B three-way valve, a return pipe communicated with the connecting pipe is arranged at the other interface of the B three-way valve, and the air pump is enabled to exhaust and inflate the shunt tube through the conversion of the A three-way valve and the B three-way valve, so that the gas in the telescopic cylinder is led in and exhausted, and the telescopic cylinder is controlled to stretch.

Preferably, the winding and unwinding assembly comprises two rotatable winding discs arranged in the winding box, the two winding discs are synchronously driven by a chain wheel and a chain, and the motor is used as a drive to drive the chain to drive, so that the two winding discs respectively wind and release the screening mesh belt, the screening mesh belt flows, and the aperture of the screening mesh belt is adjusted.

Preferably, the drying mechanism comprises an exhaust frame and a collecting frame which are arranged on the box frame, wherein the exhaust frame and the collecting frame are positioned at two ends of a discharge hole of the hopper, the exhaust frame is positioned below the collecting frame, a plurality of groups of inclined exhaust holes are arranged on the exhaust frame, the exhaust frame is communicated with the exhaust holes through pipelines, the pipelines are communicated with a separator on the base, a material opening is formed in the collecting frame, a blanking groove is arranged in the material opening, the blanking groove is connected with an air inlet of an air heater on the base through the pipelines, an air outlet of the air heater is communicated with the separator through the pipelines, the exhaust frame discharges hot air to the screening mesh belt, seeds are dried, and impurities of the seeds are collected by the collecting frame and filtered by the separator.

Compared with the prior art, the invention has the following beneficial effects:

(1) Screening seeds with different particle diameters by using the screening mesh belt as a screen, and screening various seeds by adjusting the position of the screening mesh belt;

(2) And the seeds are dried by hot air in the discharging process of the seeds, impurities and lighter seeds in the seeds are taken away by the hot air in the hot air drying process, and the seeds are further screened and treated.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 shows the present invention a screen box structure schematic diagram;

FIG. 3 is a schematic view of the partial structure of FIG. 2 according to the present invention;

FIG. 4 shows the present invention a schematic diagram of a compressing mechanism;

FIG. 5 is a schematic view of the split structure of FIG. 4 according to the present invention;

FIG. 6 is a schematic view of the telescopic cylinder structure of the invention;

FIG. 7 is a schematic view of the split structure of FIG. 6 according to the present invention;

FIG. 8 is a schematic view of a winding assembly of the present invention;

FIG. 9 is a schematic diagram of a drying mechanism according to the present invention;

fig. 10 is a schematic structural view of the collecting rack of the present invention.

In the figure: 1. a base; 2. a frame; 3. a buffer spring; 4. a screen box; 41. a box frame; 42. a pair of rollers; 43. a guide roller; 44. a support beam; 45. a roller; 46. a conveying roller; 47. screening the mesh belt; 48. a material guide plate; 49. a discharge chute; 5. a vibration motor; 6. a movable seat; 7. a winding box; 71. a winding disc; 72. a sprocket; 73. a chain; 74. a motor; 8. a compressing mechanism; 81. a support bar; 82. a notch; 83. a compaction block; 84. a telescopic cylinder; 841. a cylinder; 842. a positioning ring; 843. a piston; 844. a movable rod; 845. a connecting block; 85. a pneumatic system; 851. a shunt; 852. a connecting pipe; 853. a three-way valve; 854. an air pump; 855. an exhaust pipe A; 856. b three-way valve; 857. an exhaust pipe B; 858. a return pipe; 9. a drying mechanism; 91. an exhaust frame; 92. a collection rack; 93. an exhaust port; 94. a separator; 95. a material port; 96. a material dropping groove; 97. an air heater; 10. and (3) a hopper.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, a technical solution of the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present disclosure, and detailed descriptions of known functions and known components are omitted from the present disclosure in order to avoid unnecessarily obscuring the concept of the present disclosure.

Please refer to fig. 1, a seed screening drying device for forestry planting, including base 1 and install frame 2 on base 1, and frame 2 is connected with sieve case 4 through a plurality of group buffer spring 3, frame 2 includes that a plurality of groups are by high to low support that is the H type and constitute, and sieve case 4 is slope downwardly designed, vibrating motor 5 is installed to the bottom of sieve case 4, utilizes a plurality of groups to make sieve case 4 be the slope form by high to low support, and the seed on it is accomplished the screening along the inclined plane landing under vibrating motor 5 induced vibration.

The bottom and the both sides of screen box 4 are all through buffer spring 3 and a plurality of group's leg joint for screen box 4 is at vibration in-process, avoids screen box 4 to collide with frame 2, and buffer spring 3 of screen box 4 side also can provide good stable effect for screen box 4, avoids screen box 4 to rock too big at vibration in-process.

Referring to fig. 2 and 3, the screen box 4 includes a box frame 41 with a U-shaped cross section, two pairs of rollers 42 symmetrically distributed up and down are provided at the front end inside the box frame 41, two guide rollers 43 symmetrically distributed up and down are installed at the end inside the box frame 41, supporting beams 44 are installed at both sides of the inner wall of the box frame 41, a plurality of groups of rotatable rollers 45 are provided between the two supporting beams 44, rotatable transmission rollers 46 are provided in the box frame 41 below the rollers 45, a screening mesh belt 47 is laid on the rollers 45, the screening mesh belt 47 is redirected by the two guide rollers 43 and detours through the plurality of groups of transmission rollers 46, and both ends of the screening mesh belt 47 are led out by the two groups of pairs of rollers 42;

The drum 45 serves as a supporting point to support the sieving net belt 47, so that the sieving net belt 47 on the drum 45 forms a plane for sieving, the sieving net belt 47 serves as a screen to be wound and wound, seeds are sieved, two ends of the sieving net belt 47 are positioned by using two pairs of rollers 42, the sieving net belt 47 passes through the drum 45 and is reversely output under the guidance of two guide rollers 43, and the sieving net belt 47 can be driven in the box frame 41.

The screening mesh belt 47 is formed by connecting screens with different apertures, the screening mesh belt 47 positioned on the roller 45 is a screening part, two ends of the screening mesh belt 47 pass through the two supporting beams 44, the screens with different apertures on the screening mesh belt 47 pass through the roller 45 by driving the screening mesh belt 47, and the apertures of the screening mesh belt 47 on the roller 45 can be adjusted, so that screening is carried out on different seeds.

The inside of box frame 41 has the stock guide 48 that is located between the screening guipure 47, and the bottom of box frame 41 side is equipped with the blown down tank 49 that is used for stock guide 48 to discharge, stock guide 48 includes the plate body that is parallel with box frame 41 bottom and connects at the terminal chute of plate body, after the screening guipure 47 on the cylinder 45 sieves, the seed that the particle diameter is less and some impurity can drop on stock guide 48 and discharge through blown down tank 49, and the plate body on stock guide 48 is the inclined plane, consequently the object on it can slide, drop in the chute, and the object in the chute continues along the inclined plane of chute and discharges from blown down tank 49, so the object after convenient screening discharges, and screening guipure 47 distributes around stock guide 48, screening guipure 47 above the stock guide 48 mainly sieves the seed, and screening guipure 47 is circuitous to receive and release screening guipure 47 from the stock guide 48.

Be equipped with the movable seat 6 that is located screen box 4 front end on the base 1, and the rolling case 7 is installed on the top of movable seat 6, be equipped with in the rolling case 7 and be used for carrying the receipts subassembly of screening guipure 47, receive and release screening guipure 47 through the receipts subassembly in the rolling case 7, make screening guipure 47 transmit on cylinder 45, and screening guipure 47 comprises the screen cloth of a plurality of different apertures, so remove the screen cloth of appointed aperture to cylinder 45 on, thereby adjust the aperture size of screening guipure 47 on the cylinder 45, in order to the seed of different particle diameters.

The movable seat 6 is in sliding connection with the base 1 through the sliding rail, the movable seat 6 is pushed to slide on the base 1 through the electric cylinder, and because the screen box 4 is in a vibrating state in operation, in order to avoid the screening net belt 47 to transmit vibration to the collecting and releasing assembly, the movable seat 6 is pushed to move through the electric cylinder, so that the screening net belt 47 between the rolling box 7 and the screen box 4 is loosened, and the vibrating process of the screen box 4 cannot influence the collecting and releasing assembly.

Referring to fig. 8, the winding and unwinding assembly includes two rotatable winding discs 71 disposed in the winding box 7, and the two winding discs 71 are synchronously driven by a sprocket 72 and a chain 73, and the two winding discs 71 are driven by a motor 74 as a driving drive chain 73 to wind and release the screening mesh belt 47 respectively, so that the screening mesh belt 47 is driven in the screening box 4, and a part with a designated aperture size is moved onto the drum 45, so as to complete the aperture adjustment process of the screening mesh belt 47.

Referring to fig. 4 and 5, two sides of the inside of the box frame 41 are provided with pressing mechanisms 8, and two ends of the screening mesh belt 47 are pressed on two supporting beams 44 by the pressing mechanisms 8; the hold-down mechanism 8 is including installing the support bar 81 at the box 41 inner wall, the top of support bar 81 is the inclined plane, and the bottom of support bar 81 is equipped with the notch 82 that runs through, be equipped with a plurality of gliding compact heap 83 from top to bottom in the notch 82, and the both sides of compact heap 83 are equipped with spout and slider respectively, and through spout and slider mutual sliding connection between the compact heap 83, the internally mounted of support bar 81 has a plurality of groups to be used for driving the compact heap 83 and moves down the flexible section of thick bamboo 84 that compresses tightly screening guipure 47, install the pneumatic system 85 that is used for driving flexible section of thick bamboo 84 in the movable seat 6.

In order to avoid the seeds from slipping off the edges of the sieving mesh belt 47, the edges of the sieving mesh belt 47 are supported by the two supporting beams 44 and are compacted by the compacting mechanism 8, so that the sieving mesh belt 47 on the drum 45 is prevented from moving in a vibration process, all the telescopic drums 84 are inflated by the pneumatic system 85, the telescopic drums 84 are stretched and the compacting blocks 83 are driven to move downwards, each compacting block 83 can compact the edges of the sieving mesh belt 47 on the supporting beam 44, the sieving mesh belt 47 can be prevented from moving, and the compacting blocks 83 can move up and down independently, so that the compacting blocks 83 can be better contacted with the supporting beam 44 and compact the sieving mesh belt 47 to prevent the seeds from passing through the edges of the sieving mesh belt 47, and when the pneumatic system 85 sucks all the telescopic drums 84, the telescopic drums 84 drive the compacting blocks 83 to move upwards, so that the sieving mesh belt 47 can drive and adjust the sieving area of the sieving mesh belt 47 on the drum 45.

Referring to fig. 6 and 7, the telescopic cylinder 84 includes a cylinder 841 installed in a notch 82 at the bottom of the supporting bar 81, a positioning ring 842 is installed at the bottom end of the cylinder 841, a slidable piston 843 is provided in the cylinder 841, a movable rod 844 is installed at the bottom end of the piston 843, the bottom end of the movable rod 844 is led out from the positioning ring 842 and is connected with a connecting block 845, a circular groove is formed at the top end of the compressing block 83, the telescopic cylinder 84 is hidden in the circular groove of the compressing block 83, the connecting block 845 is installed at the bottom end of the circular groove of the compressing block 83, and the piston 843 is driven to move up and down by adjusting the air pressure in the cylinder 841, so that the movable rod 844 pushes the connecting block 845 to move and drives the compressing block 83 to move.

Referring to fig. 5, the pneumatic system 85 includes a shunt tube 851 installed inside the support bar 81, the shunt tube 851 conveys the gas into each cylinder 841 through a pipeline, the shunt tube 851 is led into the movable seat 6 through a connecting pipe 852 and is connected with an a three-way valve 853, the a three-way valve 853 is connected with the air outlet of an air pump 854 through a pipeline, the other port of the a three-way valve 853 is installed with an a exhaust pipe 855, the air inlet pipe of the air pump 854 is connected with a B three-way valve 856 through a pipeline, the other port of the B three-way valve 856 is installed with a B exhaust pipe 857, the other port of the B three-way valve 856 is installed with a return pipe 858 which is communicated with the connecting pipe 852, and the air pump 854 is led into and inflated through the conversion of the a three-way valve 853 and the B three-way valve 856, thereby realizing the air introduction and the air extraction in the telescopic cylinder 84 and the control of the telescopic cylinder 84.

When the telescopic cylinder 84 is inflated, the air pump 854 is operated, the A three-way valve 853 and the B exhaust pipe 857 are adjusted, so that air enters from the B exhaust pipe 857 and is sucked by the air pump 854 through the B three-way valve 856, the air is finally guided into the telescopic cylinder 84 from the A three-way valve 853, the connecting pipe 852 and the shunt pipe 851, the telescopic cylinder 84 is stretched after a large amount of air is guided, and the compression block 83 is driven to move downwards to be in contact with the supporting beam 44 and compress the screening mesh belt 47;

When the telescopic tube 84 is sucked, the a three-way valve 853 and the B exhaust tube 857 are adjusted so that the air in the telescopic tube 84 is sucked from the shunt tube 851, the connection tube 852, the return tube 858 and the B three-way valve 856 by the air pump 854, and is introduced into the a exhaust tube 855 from the a three-way valve 853.

The front end of the screen box 4 is provided with a hopper 10, the screen box 4 is provided with a drying mechanism 9 for heating and drying the hopper 10, and the drying mechanism 9 can dry seeds led out from the hopper 10 by hot air and lead out impurities in the seeds.

Referring to fig. 9 and 10, the drying mechanism 9 includes an exhaust frame 91 and a collecting frame 92 mounted on the box frame 41, the exhaust frame 91 and the collecting frame 92 are located at two ends of the discharge hole of the hopper 10, the exhaust frame 91 is located below the collecting frame 92, a gap for passing seeds is left between the bottom end of the exhaust frame 91 and the sieving mesh belt 47, and the bottom end of the collecting frame 92 is in contact with the sieving mesh belt 47, so that the seeds can pass through the bottom of the exhaust frame 91, and the exhaust frame 91 blows the impurities on the sieving mesh belt 47 backwards by wind force, so that the impurities enter the collecting frame 92.

Install a plurality of groups on the exhaust frame 91 and be the gas vent 93 of slope, and the exhaust frame 91 passes through pipeline and gas vent 93 intercommunication, and the separator 94 intercommunication on pipeline and the base 1, the material mouth 95 has been seted up on the collection frame 92, and installs the blanking groove 96 in the material mouth 95, the blanking groove 96 passes through the pipeline and is connected with the air intake of the air heater 97 on the base 1, and the air outlet of air heater 97 passes through pipeline and separator 94 intercommunication, and the exhaust frame 91 is to screening guipure 47 exhaust hot-blast, dries the seed, and the impurity of collecting the frame 92 to the seed is collected and is filtered through separator 94.

The screening mesh belt 47 is dried by blowing hot air through the air outlet 93, impurities and lighter seeds in the seeds move backwards under the wind force and are blown into the material inlet 95 of the collecting frame 92, the bottom of the material inlet 95 is of an inclined design, the impurities and lighter seeds under the wind force more easily enter the material inlet 95 and fall into the material dropping groove 96 and slide down the inclined plane of the material dropping groove 96, the impurities and lighter seeds are sucked into the separator 94 through the air heater 97 due to the suction force generated inside the material dropping groove 96, the impurities and lighter seeds in the air are separated and led out from the separator 94 through the air heater 97, the cyclone separator can be adopted for the separator 94, and the filtered air is led out from the air outlet 93 on the air exhaust frame 91 through a pipeline, so that the drying is finished and the seeds can be further processed.

The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.

Claims

1. Seed screening drying device for forestry planting, its characterized in that: the vibrating screen comprises a base (1) and a frame (2) arranged on the base (1), wherein the frame (2) is connected with a screen box (4) through a plurality of groups of buffer springs (3), the screen box (4) is in inclined downward design, and a vibrating motor (5) is arranged at the bottom end of the screen box (4);

The screening box (4) comprises a box frame (41) with a U-shaped cross section, two groups of paired rollers (42) which are vertically and symmetrically distributed are arranged at the front end inside the box frame (41), two guide rollers (43) which are vertically and symmetrically distributed are arranged at the tail end inside the box frame (41), supporting beams (44) are arranged at two sides of the inner wall of the box frame (41), a plurality of groups of rotatable rollers (45) are arranged between the two supporting beams (44), rotatable transmission rollers (46) are arranged in the box frame (41) below the rollers (45), screening mesh belts (47) are paved on the rollers (45), the screening mesh belts (47) are redirected through the two guide rollers (43) and bypass the two ends of the screening mesh belts (47) are led out through the two groups of paired rollers (42);

The screening net belt (47) is formed by connecting a plurality of screens with different apertures, two ends of the screening net belt (47) pass through the two supporting beams (44), two sides of the inside of the box frame (41) are respectively provided with a pressing mechanism (8), and the two ends of the screening net belt (47) are pressed on the two supporting beams (44) through the pressing mechanisms (8);

A guide plate (48) positioned between the screening mesh belts (47) is arranged in the box frame (41), a discharge chute (49) used for discharging the guide plate (48) is arranged at the bottom of the side surface of the box frame (41), and seeds fall on the guide plate (48) and are discharged through the discharge chute (49) after being sorted by the screening mesh belts (47);

a movable seat (6) positioned at the front end of the screen box (4) is arranged on the base (1), a winding box (7) is arranged at the top end of the movable seat (6), a winding and unwinding component used for conveying the screening mesh belt (47) is arranged in the winding box (7), the screening mesh belt (47) is wound and unwound through the winding and unwinding component in the winding box (7), and the aperture size of the screening mesh belt (47) is adjusted;

the movable seat (6) is in sliding connection with the base (1) through a sliding rail, and the movable seat (6) is pushed to slide on the base (1) through an electric cylinder;

the winding and unwinding assembly comprises two rotatable winding discs (71) arranged in a winding box (7), the two winding discs (71) are synchronously driven by a chain wheel (72) and a chain (73), and a motor (74) is used for driving the chain (73) to drive, so that the two winding discs (71) respectively wind and release the screening mesh belt (47), the screening mesh belt (47) flows, and the aperture of the screening mesh belt (47) is adjusted;

The compressing mechanism (8) comprises a supporting bar (81) arranged on the inner wall of the box frame (41), the top end of the supporting bar (81) is an inclined plane, the bottom end of the supporting bar (81) is provided with a through notch (82), a plurality of groups of compressing blocks (83) capable of sliding up and down are arranged in the notch (82), two sides of each compressing block (83) are respectively provided with a sliding groove and a sliding block, the compressing blocks (83) are connected with each other in a sliding manner through the sliding grooves and the sliding blocks, a plurality of groups of telescopic cylinders (84) for driving the compressing blocks (83) to move downwards to compress the screening mesh belt (47) are arranged in the supporting bar (81), and a pneumatic system (85) for driving the telescopic cylinders (84) is arranged in the movable seat (6);

The front end of the screen box (4) is provided with a hopper (10), the screen box (4) is provided with a drying mechanism (9) for heating and drying the hopper (10), and the drying mechanism (9) can dry seeds led out from the hopper (10) by hot air and lead out impurities in the seeds.

2. A seed screening and drying device for forestry planting as set forth in claim 1, wherein: the frame (2) comprises a plurality of groups of H-shaped brackets from high to low, and the bottom and two sides of the screen box (4) are connected with the plurality of groups of brackets through buffer springs (3).

3. A seed screening and drying device for forestry planting as set forth in claim 1, wherein: the material guiding plate (48) comprises a plate body parallel to the bottom of the box frame (41) and a chute connected to the tail end of the plate body, and seeds falling onto the plate body after screening slide into the chute along the inclined plane of the plate body and are guided out of the material discharging chute (49) under the inclined plane of the chute.

4. A seed screening and drying device for forestry planting as set forth in claim 1, wherein: the telescopic cylinder (84) comprises a cylinder body (841) arranged in a notch (82) at the bottom of the supporting bar (81), a positioning ring (842) is arranged at the bottom end of the cylinder body (841), a slidable piston (843) is arranged in the cylinder body (841), a movable rod (844) is arranged at the bottom end of the piston (843), the bottom end of the movable rod (844) is led out of the positioning ring (842) and connected with a connecting block (845), a circular groove is formed in the top end of the compressing block (83), the telescopic cylinder (84) is hidden in the circular groove of the compressing block (83), and the connecting block (845) is arranged at the bottom end of the circular groove of the compressing block (83).

5. A seed screening and drying device for forestry planting as set forth in claim 1, wherein: the pneumatic system (85) comprises a shunt pipe (851) arranged inside the supporting bar (81), the shunt pipe (851) conveys gas into each cylinder (841) through a pipeline, the shunt pipe (851) is led into a movable seat (6) through a connecting pipe (852) and is connected with an A three-way valve (853), the A three-way valve (853) is connected with an air outlet of an air pump (854) through a pipeline, the other interface of the A three-way valve (853) is provided with an A exhaust pipe (855), an air inlet pipe of the air pump (854) is connected with a B three-way valve (856) through a pipeline, the other interface of the B three-way valve (856) is provided with a backflow pipe (858) communicated with the connecting pipe (852), and the air pump (854) is enabled to suck and inflate the shunt pipe (851) through the conversion of the A three-way valve (853) to realize the air inlet and the air outlet of the telescopic cylinder (84), and the telescopic cylinder (84) is controlled.

6. A seed screening and drying device for forestry planting as set forth in claim 1, wherein: drying mechanism (9) are including installing exhaust frame (91) and collection frame (92) on box frame (41), exhaust frame (91) and collection frame (92) are located the both ends of hopper (10) discharge gate, and exhaust frame (91) are located the below of collecting frame (92), install a plurality of groups on exhaust frame (91) and be gas vent (93) that inclines, and exhaust frame (91) are through pipeline and gas vent (93) intercommunication, and separator (94) intercommunication on pipeline and base (1), set up feed opening (95) on collecting frame (92), and install in feed opening (95) fall silo (96), fall silo (96) are through pipeline and hot-air machine (97) air intake connection on base (1), and the air outlet of hot-air machine (97) is through pipeline and separator (94) intercommunication, exhaust frame (91) are dry to screening guipure (47), and collect impurity of seed and filter through separator (94).