CN112020964A - Fertilizer distributor for agriculture - Google Patents

Abstract

The invention discloses an agricultural fertilizer applicator, which is characterized in that: the car body lateral part is close to the bottom position and is equipped with the removal wheel, evenly distributed is equipped with the rib on the activity segmental arc screen cloth, evenly distributed is equipped with the arch on the revolving leaf of auger, baffle left side and car body constitute broken chamber, the segmental arc board top of gathering materials, baffle right-hand member and car body constitute the chamber of gathering materials, the segmental arc board bottom of gathering materials, baffle right-hand member and car body constitute the row material chamber, evenly distributed is equipped with the material application carousel on arranging the roller of arranging the material intracavity in, evenly distributed is equipped with flourishing silo on the material application carousel, flourishing silo embeds the flourishing material body, flourishing material body is connected through the pendulum rod between the regulation pole, it extends to arrange in the regulation chamber outside and at the spacing body of end connection to adjust pole wherein one end, it is equipped with the lid to arrange in on the regulation pole outside the regulation chamber. The invention has the advantages that: the feeding speed is high, the crushing efficiency is high, and the fertilizing amount is convenient to adjust.

Description

Fertilizer distributor for agriculture

Technical Field

The invention belongs to the technical field of agricultural fertilization, and particularly relates to an agricultural fertilizer applicator.

Background

With the development of modern agricultural science and technology, scientific and reasonable fertilization is a basic guarantee for keeping sufficient and balanced water and soil nutrients, growth vigor of crops and stable yield, and is particularly suitable for large-area farmland cultivation, the existing fertilization is generally divided into two types, namely a liquid fertilizer and a solid fertilizer, the solid fertilizer is easy to store and transport and is convenient to use, but the phenomenon of fertilizer hardening is easily caused during storage and transportation of the solid fertilizer, the fertilizer hardening easily causes blockage of a fertilization device and is not beneficial to effective absorption of crops; in the existing fertilizer applicator, in order to prevent the fertilizer from hardening, a crushing roller shaft is arranged at a feed inlet, so that the hardened and non-hardened fertilizer is crushed firstly, the crushing speed is low, and the fertilizer is stuck on the crushing roller, so that the crushing effect is influenced; in addition, the fertilizing amount is not easy to control, and the reasonable planning can not be carried out according to crops planted in a farmland, so that the fertilizing effect is influenced, and the yield of the crops is influenced. Therefore, it is important to solve the above problems.

Disclosure of Invention

The invention overcomes the defects of the prior art and provides the agricultural fertilizer applicator with high feeding speed, high crushing efficiency and convenient adjustment of fertilizer application amount.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the utility model provides a fertilizer distributor for agricultural which characterized in that: the movable arc-shaped screen cloth is characterized by comprising a vehicle body, movable wheels and a feed hopper, wherein the movable wheels are arranged at the position, close to the bottom, of the side part of the vehicle body, the movable wheels are sleeved on a rotating shaft, the rotating shaft is rotatably connected onto the vehicle body, the right end of the top of the vehicle body is communicated with the feed hopper, a movable arc-shaped screen cloth is arranged in a cavity of the vehicle body at the position corresponding to the feed hopper, ribs are uniformly distributed on the movable arc-shaped screen cloth, pressure bearing seats are uniformly distributed on the movable arc-shaped screen cloth between the front side and the rear side of the movable arc-shaped screen cloth and a contact surface of the vehicle body, openings are formed in the vehicle body between the front side and the rear side of the movable arc-shaped screen cloth and the contact surface of the vehicle body, the pressure bearing seats extend to the openings, return springs are arranged in the, the screening cavity is formed by the upper part of the movable arc section screen and the vehicle body, the auger is arranged in the screening cavity, the rotary blade of the auger is uniformly provided with bulges which can be supported on the ribs, one end of the auger penetrates through the vehicle body and is sleeved with a first driven belt pulley at the end part, the left side in the vehicle body cavity below the movable arc section screen is provided with a baffle plate, the left side of the baffle plate and the vehicle body form a crushing cavity, an aggregate arc section plate is arranged at the position close to the bottom in the vehicle body cavity below the movable arc section screen, the top of the aggregate arc section plate, the right end of the baffle plate and the vehicle body form a material collecting cavity, the bottom of the aggregate arc section plate, the right end of the baffle plate and the vehicle body form a material discharging cavity, the fixed screen is arranged in the crushing cavity, the center of the fixed screen is provided with a fixed seat, and the fixed, the device is characterized in that a guide groove is spirally arranged on the pushing column between the fixed seat and the contact surface of the pushing column, a guide block is arranged on the fixed seat between the fixed seat and the contact surface of the pushing column, the guide block is arranged in the guide groove, a pressing body is fixedly connected with the top of the pushing column, brushes are uniformly distributed at the side part of the pressing body, the bottom of the pushing column is rotatably connected onto a piston body, a discharge plate is uniformly distributed on the pushing column near the position of the piston body, the discharge plate corresponds to the position, a discharge hole is arranged on the baffle, the piston body is hinged with a connecting rod, the connecting rod is rotatably connected with an eccentric wheel, the eccentric wheel is sleeved on a roller shaft, the roller shaft penetrates through the baffle plate and is arranged outside the discharge cavity in an extending manner, a driven gear and a second driven belt pulley are sleeved at the end part, the second driven belt pulley is connected with the first driven belt pulley through a belt, the roller shaft arranged in the discharge cavity is uniformly distributed with a fertilization turntable, the aggregation arc segment plate at the corresponding position of the fertilization turntable is uniformly distributed with fertilization ports, the fertilization turntable can be arranged in the aggregation cavity through the fertilization ports, the center of the roller shaft is provided with an adjusting cavity, the adjusting cavity is internally provided with an adjusting rod, the fertilization turntable is uniformly distributed with material containing grooves which are mutually communicated with the adjusting cavity, the material containing grooves are internally provided with material containing bodies, the material containing bodies are connected with the adjusting rod through a swing rod, a support bearing is arranged between the adjusting rod and the contact surface of the adjusting cavity, one end of the adjusting rod extends out of the adjusting cavity and is connected with a limiting body at the end part, and the adjusting rod arranged out of the adjusting cavity is sleeved with a cover body, the lid with between the spacing body the cover is equipped with spacing spring on the regulation pole, the lid is established on the roller, the lid with between the regulation pole contact surface be equipped with first spacing groove on the regulation pole, the lid with between the regulation pole contact surface be equipped with first stopper on the lid, first stopper is arranged in first spacing groove, the lid with between the roller contact surface be equipped with the second spacing groove on the roller, the lid with between the roller contact surface be equipped with the second stopper on the lid, the second stopper is arranged in the second spacing groove.

Compared with the prior art, the invention has the advantages that: fertilizer enters the screening cavity, non-agglomerated fertilizer enters the material collecting cavity under the action of the movable arc screen mesh, agglomerated fertilizer enters the crushing cavity under the action of the auger, and the protrusions on the auger can repeatedly abut against the ribs in the rotation process of the auger so as to push the movable arc screen mesh to swing up and down, so that the non-agglomerated fertilizer continuously enters the material collecting cavity and the movable arc screen mesh is prevented from being blocked; the pushing column and the pressing body can rotate around the axis of the pushing column and the pressing body in the up-and-down moving process, so that the brush can clean the fertilizer stuck on the side wall, and the discharge plate can discharge the crushed fertilizer into the material collecting cavity through the discharge port; when the fertilizing amount needs to be adjusted, the cover body is pushed to move towards the limiting body, the corresponding first limiting block moves along the extending direction of the first limiting groove, the second limiting block moves along the second limiting groove and moves out of the second limiting groove, the cover body is not in contact with the roller shaft, meanwhile, the adjusting rod is rotated, the adjusting rod rotates to drive the swing rod, the swing rod drives the containing body to move in the containing groove, and the fertilizing amount of the containing groove is correspondingly adjusted by adjusting the position of the containing body in the containing groove.

Drawings

Fig. 1 is a schematic front view of the agricultural fertilizer applicator of the present invention.

Fig. 2 is a schematic front sectional view of the agricultural fertilizer applicator of the present invention, in which the pressure applying body is shown disposed at the upper limit position of the crushing chamber.

Fig. 3 is a schematic front view of the agricultural fertilizer applicator of the present invention, showing the pressure applying body disposed at the lower limit position of the crushing chamber.

Fig. 4 is an enlarged structural view of the direction a of the agricultural fertilizer applicator shown in fig. 1.

Fig. 5 is a schematic view of a structure of the agricultural fertilizer applicator shown in fig. 3 in an enlarged direction B.

Fig. 6 is a schematic view of an enlarged structure of the agricultural fertilizer applicator of fig. 3 in the direction of C.

Fig. 7 is a schematic view of a structure of the agricultural fertilizer applicator shown in fig. 3 enlarged in the direction D.

Fig. 8 is a schematic front view of the structure of the fixed screen and the fixed seat of the agricultural fertilizer applicator of the present invention.

Fig. 9 is a schematic structural view of a material containing body of the agricultural fertilizer applicator of the present invention placed in a material containing groove.

Fig. 10 is a schematic structural view of a material containing body of the fertilizer applicator for agriculture of the present invention placed in a material containing trough, wherein the material containing body is shown moving to the bottom of the material containing trough.

In the figure, 1, a vehicle body, 2, a moving wheel, 3, a feed hopper, 4, a rotating shaft, 5, a movable arc-section screen mesh, 6, ribs, 7, a pressure bearing seat, 8, an opening, 9, a return spring, 10, a screening cavity, 11, an auger, 12, a bulge, 13, a first driven belt pulley, 14, a baffle, 15, a crushing cavity, 16, an aggregate arc-section plate, 17, an aggregate cavity, 18, a discharge cavity, 19, a fixed screen mesh, 20, a fixed seat, 21, a pushing column, 22, a guide groove, 23, a guide block, 24, a pressure applying body, 25, a brush, 26, a piston body, 27, a discharge plate, 28, a discharge opening, 29, a connecting rod, 30, an eccentric wheel, 31, a roller shaft, 32, a driven gear, 33, a second driven belt pulley, 34, a driving gear, 35, a material applying rotary disc, 36, a material applying opening, 37, an adjusting cavity, 38, an adjusting rod, 39, a material containing groove, 40, a material containing body, 41 and, 42. the bearing support device comprises a support bearing, 43, a limiting body, 44, a cover body, 45, a limiting spring, 46, a first limiting groove, 47, a first limiting block, 48, a second limiting groove and 49, a second limiting block.

Detailed Description

The following examples are intended to further illustrate the present invention and should not be construed as limiting the scope of the invention, and other insubstantial modifications and adaptations of the invention by those skilled in the art based on the teachings herein are intended to be covered thereby.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In fig. 1 to 10, 1, a vehicle body, 2, a moving wheel, 3, a feed hopper, 4, a rotating shaft, 5, a movable arc-section screen mesh, 6, ribs, 7, a bearing seat, 8, an opening, 9, a return spring, 10, a screening cavity, 11, an auger, 12, a protrusion, 13, a first driven pulley, 14, a baffle, 15, a crushing cavity, 16, an aggregate arc-section plate, 17, a material collecting cavity, 18, a material discharging cavity, 19, a fixed screen mesh, 20, a fixed seat, 21, a pushing column, 22, a guide groove, 23, a guide block, 24, a pressure applying body, 25, a brush, 26, a piston body, 27, a material discharging plate, 28, a material discharging opening, 29, a connecting rod, 30, an eccentric wheel, 31, a roller shaft, 32, a driven gear, 33, a second driven pulley, 34, a driving gear, 35, a material applying rotary disc, 36, a material applying opening, 37, an adjusting cavity, 38, an adjusting rod, 39, a material containing groove, 40, a material containing, 41. the swing rod, 42, a support bearing, 43, a limiting body, 44, a cover body, 45, a limiting spring, 46, a first limiting groove, 47, a first limiting block, 48, a second limiting groove and 49, a second limiting block.

The utility model provides a fertilizer distributor for agricultural which characterized in that: the screening device comprises a vehicle body 1, moving wheels 2 and a feed hopper 3, wherein the moving wheels 2 are arranged at the positions, close to the bottom, of the side part of the vehicle body 1, the moving wheels 2 are sleeved on a rotating shaft 4, the rotating shaft 4 is rotatably connected to the vehicle body 1, the right end of the top of the vehicle body 1 is communicated with the feed hopper 3, a movable arc screen 5 is arranged in a cavity of the vehicle body 1 at the position corresponding to the feed hopper 3, ribs 6 are uniformly distributed on the movable arc screen 5, bearing seats 7 are uniformly distributed on the movable arc screen 5 between the front side and the rear side of the movable arc screen 5 and the contact surface of the vehicle body 1, openings 8 are arranged on the vehicle body 1 between the front side and the rear side of the movable arc screen 5 and the contact surface of the vehicle body 1, the bearing seats 7 extend and are arranged in the openings 8, return springs 9 are arranged in the openings 8, one end of each return spring 9 is abutted against the bottom of the bearing, the screening cavity 10 is internally provided with an auger 11, rotary blades of the auger 11 are uniformly provided with bulges 12 in a distributed manner, the bulges 12 can be propped against ribs 6, one end of the auger 11 penetrates through the car body 1, the end part of the auger 11 is sleeved with a first driven belt pulley 13, the left side in the car body 1 cavity below the movable arc-section screen 5 is provided with a baffle 14, the left side of the baffle 14 and the car body 1 form a crushing cavity 15, the position, close to the bottom, in the car body 1 cavity below the movable arc-section screen 5 is provided with a material collecting arc-section plate 16, the top of the material collecting arc-section plate 16, the right end of the baffle 14 and the car body 1 form a material collecting cavity 17, the bottom of the material collecting arc-section plate 16, the right end of the baffle 14 and the car body 1 form a material arranging cavity 18, a fixed screen 19 is arranged in the crushing cavity 15, the center of the fixed screen 19 is provided with a fixed, a guide block 23 is arranged on the fixed seat 20 between the contact surfaces of the fixed seat 20 and the pushing column 21, the guide block 23 is arranged in a guide groove 22, the top of the pushing column 21 is fixedly connected with a pressing body 24, brushes 25 are uniformly distributed on the side part of the pressing body 24, the bottom of the pushing column 21 is rotatably connected on a piston body 26, a discharging plate 27 is uniformly distributed on the pushing column 21 close to the piston body 26, a discharging opening 28 is arranged on a baffle plate 14 corresponding to the discharging plate 27, the piston body 26 is hinged with a connecting rod 29, the connecting rod 29 is rotatably connected with an eccentric wheel 30, the eccentric wheel 30 is sleeved on a roller shaft 31, the roller shaft 31 penetrates through the baffle plate 14 and extends out of the discharging cavity 18, the end part of the roller shaft is sleeved with a driven gear 32 and a second driven pulley 33, the driven gear 32 is meshed with a driving gear 34, the driving gear 34 is sleeved on the rotating shaft 4, the second driven, the material collecting arc-section plate 16 at the corresponding position of the material applying turntable 35 is uniformly distributed with material applying ports 36, the material applying turntable 35 can be arranged in the material collecting cavity 17 through the material applying ports 36, the center of the roller shaft 31 is provided with an adjusting cavity 37, the adjusting cavity 37 is internally provided with an adjusting rod 38, the material containing groove 39 is uniformly distributed on the material applying turntable 35, the material containing groove 39 is communicated with the adjusting cavity 37, the material containing groove 39 is internally provided with a material containing body 40, the material containing body 40 is connected with the adjusting rod 38 through a swing rod 41, a supporting bearing 42 is arranged between the adjusting rod 38 and the adjusting cavity 37, one end of the adjusting rod 38 extends out of the adjusting cavity 37 and is connected with a limiting body 43 at the end part, the adjusting rod 38 arranged out of the adjusting cavity 37 is sleeved with a cover body 44, the adjusting rod 38 between the cover body 44 and the limiting body 43 is sleeved with a limiting spring 45, the cover body 44 is covered on the roller shaft 31, the adjusting rod, a first limiting block 47 is arranged on the cover body 44 between the contact surfaces of the cover body 44 and the adjusting rod 38, the first limiting block 47 is arranged in a first limiting groove 46, a second limiting groove 48 is arranged on the roller shaft 31 between the contact surfaces of the cover body 44 and the roller shaft 31, a second limiting block 49 is arranged on the cover body 44 between the contact surfaces of the cover body 44 and the roller shaft 31, and the second limiting block 49 is arranged in the second limiting groove 48.

When the device works, fertilizer is put in through the feed hopper 3, the fertilizer enters the screening cavity 10, the non-caking fertilizer enters the material collecting cavity 17 under the action of the movable arc-section screen 5, the caking fertilizer enters the crushing cavity 15 under the action of the packing auger 11, and the protrusions 12 on the packing auger 11 can repeatedly abut against the ribs 6 in the rotating process of the packing auger 11, so that the movable arc-section screen 5 is pushed to swing up and down, the non-caking fertilizer continuously enters the material collecting cavity 17, and the movable arc-section screen 5 is prevented from being blocked; the agglomerated fertilizer entering the crushing cavity 15 is crushed under the action of the pressure applying body 24 and the fixed screen 19, the crushed fertilizer is discharged into the aggregate cavity 17 through the discharge port 28, the eccentric wheel 30 drives the connecting rod 29, the connecting rod 29 drives the piston body 26, the piston body 26 drives the pushing column 21, the pushing column 21 drives the pressure applying body 24, the pushing column 21 is provided with a spiral guide groove 22, and the guide block 23 on the fixed seat 20 is arranged in the guide groove 22, so that the pushing column 21 and the pressure applying body 24 can rotate around the axis thereof in the up-and-down moving process, the brush 25 can clean the fertilizer adhered to the side wall, and the discharge plate 27 can discharge the crushed fertilizer into the aggregate cavity 17 through the discharge port 28; fertilizers in the screening cavity 10 and the crushing cavity 15 are finally collected in the material collecting cavity 17, are placed on the material collecting arc-section plate 16 and are discharged through the material applying opening 36, so that the purpose of applying fertilizers is achieved, the material applying opening 36 is internally provided with a material applying turntable 35, the fertilizers can enter a material containing groove 39, and the roller shaft 31 rotates to drive the material applying turntable 35, so that the fertilizers are discharged; when the fertilizing amount needs to be adjusted, the cover body 44 is pushed to move towards the limiting body 43, the corresponding first limiting block 47 moves along the extending direction of the first limiting groove 46, the second limiting block 49 moves along the second limiting groove 48 and moves out of the second limiting groove 48, so that the cover body 44 is not in contact with the roller shaft 31, meanwhile, the adjusting rod 38 is rotated, the adjusting rod 38 rotates to drive the swing rod 41, the swing rod 41 drives the material containing body 40 to move in the material containing groove 39, the fertilizing amount of the material containing groove 39 is correspondingly adjusted by adjusting the position of the material containing body 40 in the material containing groove 39, after the fertilizing amount is adjusted, the cover body 44 is loosened, the cover body 44 is positioned under the action of the limiting spring 45, the second limiting block 49 is inserted into the second limiting groove 48, so that the cover body 44 is connected with the roller shaft 31, and the adjusting rod 38 cannot rotate.

The working principle of the invention is as follows: the moving wheel 2 drives the rotating shaft 4, the rotating shaft 4 drives the driving gear 34, the driving gear 34 is meshed with the driven gear 32, the driven gear 32 drives the roller shaft 31, the roller shaft 31 rotates and simultaneously drives the eccentric wheel 30, the material applying turntable 35 and the second driven belt pulley 33, the second driven belt pulley 33 drives the first driven belt pulley 13 through a belt, the first driven belt pulley 13 drives the packing auger 11, the eccentric wheel 30 drives the connecting rod 29, and the connecting rod 29 drives the piston body 26.

The present invention is not described in detail in the prior art.

Claims (1)

1. The utility model provides a fertilizer distributor for agricultural which characterized in that: comprises a vehicle body (1), moving wheels (2) and a feed hopper (3), wherein the lateral part of the vehicle body (1) is provided with the moving wheels (2) near the bottom position, the moving wheels (2) are sleeved on a rotating shaft (4), the rotating shaft (4) is rotatably connected with the vehicle body (1), the right end of the top part of the vehicle body (1) is communicated with the feed hopper (3), the feed hopper (3) is provided with a movable arc section screen (5) in the cavity of the vehicle body (1) corresponding to the position, ribs (6) are uniformly distributed on the movable arc section screen (5), bearing seats (7) are uniformly distributed on the movable arc section screen (5) between the front side and the rear side of the movable arc section screen (5) and between the contact surfaces of the vehicle body (1), and openings (8) are arranged on the vehicle body (1), the bearing seat (7) is extended to be arranged in the opening (8), a return spring (9) is arranged in the opening (8), one end of the return spring (9) is supported at the bottom of the bearing seat (7), the other end of the return spring (9) is supported at the bottom of the opening (8), the movable arc section screen (5) is arranged above the vehicle body (1) to form a screening cavity (10), a packing auger (11) is arranged in the screening cavity (10), bulges (12) are uniformly distributed on a rotating blade of the packing auger (11), the bulges (12) can be supported on the ribs (6), one end of the packing auger (11) penetrates through the vehicle body (1) and is provided with a first driven belt pulley (13) at the end part, a baffle (14) is arranged at the left side in the cavity of the vehicle body (1) below the movable arc section screen (5), the left side of the baffle (14) and the vehicle body (1) form a crushing cavity (15), the utility model discloses a material collection device, including activity segmental arc screen cloth (5), car body (1) intracavity be close to the bottom position and be equipped with the segmental arc board (16) of gathering materials below the segmental arc screen cloth (5), segmental arc board (16) top of gathering materials baffle (14) right-hand member with car body (1) constitutes the chamber of gathering materials (17), segmental arc board (16) bottom of gathering materials baffle (14) right-hand member with car body (1) constitutes the chamber of gathering materials (18), broken chamber (15) built-in fixed screen cloth (19), fixed screen cloth (19) center is equipped with fixing base (20), fixing base (20) supply to promote post (21) and pass, be equipped with guide way (22) on promoting post (21) between fixing base (20) and the promotion post (21) contact surface in the heliciform, be equipped with guide block (23) on fixing base (20) between fixing base (20) and the promotion post (21) contact surface, guide block (23) are arranged in guide way (22), promote post (21) top fixed connection and exert pressure body (24), it is equipped with brush (25) to exert pressure body (24) lateral part evenly distributed, it connects on piston body (26) to promote post (21) bottom rotation, it is close to on promotion post (21) piston body (26) position evenly distributed is equipped with row flitch (27), row flitch (27) correspond the position be equipped with bin outlet (28) on baffle (14), piston body (26) articulated connecting rod (29), connecting rod (29) are rotated and are connected eccentric wheel (30), eccentric wheel (30) cover is established on roller (31), roller (31) run through baffle (14) extend and arrange in outside row material chamber (18) and the end cover be equipped with driven gear (32) and second driven pulley (33), driven gear (32) meshing driving gear (34), the driving gear (34) is sleeved on the rotating shaft (4), the second driven pulley (33) is connected with the first driven pulley (13) through a belt, the roller shaft (31) arranged in the discharging cavity (18) is uniformly provided with a material applying turntable (35), the material collecting arc-section plate (16) at the position corresponding to the material applying turntable (35) is uniformly provided with a material applying opening (36), the material applying turntable (35) can be arranged in the material collecting cavity (17) through the material applying opening (36), the center of the roller shaft (31) is provided with an adjusting cavity (37), the adjusting cavity (37) is internally provided with an adjusting rod (38), the material containing grooves (39) are uniformly arranged on the material applying turntable (35), the material containing grooves (39) are communicated with the adjusting cavity (37), the material containing grooves (39) are internally provided with material containing bodies (40), and the material containing bodies (40) are connected with the adjusting rod (38) through a swing rod (41), the adjusting rod (38) and the adjusting cavity (37) are provided with a supporting bearing (42) between contact surfaces, one end of the adjusting rod (38) extends to be arranged outside the adjusting cavity (37) and is connected with a limiting body (43) at the end part, the adjusting rod (38) arranged outside the adjusting cavity (37) is sleeved with a cover body (44), the cover body (44) and the limiting body (43) are arranged between the adjusting rod (38) and are sleeved with a limiting spring (45), the cover body (44) is covered on the roller shaft (31), the cover body (44) and the adjusting rod (38) between contact surfaces are provided with a first limiting groove (46) on the adjusting rod (38), the cover body (44) and the adjusting rod (38) between contact surfaces are provided with a first limiting block (47) on the cover body (44), the first limiting block (47) is arranged in the first limiting groove (46), the cover body (44) and between the contact surfaces of the roller shafts (31) are provided with second limiting grooves (48), the cover body (44) and between the contact surfaces of the roller shafts (31) are provided with second limiting blocks (49) on the cover body (44), and the second limiting blocks (49) are arranged in the second limiting grooves (48).

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