CN211891575U

CN211891575U - Sheet-shaped plastic body chopping device

Info

Publication number: CN211891575U
Application number: CN202020129722.8U
Authority: CN
Inventors: 谢金春
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-11-10
Anticipated expiration: 2030-01-20

Abstract

The utility model relates to a slice plastic body comminution device, including the slitting wheelset, the stripping knife subassembly that top-down set gradually, the slitting wheelset includes the slitting wheel of double-phase mutual unsmooth interlock, and the equal axial equipartition in week portion of slitting wheel has a plurality of annular bellied cyclic annular slitting knives, and the stripping knife subassembly includes the shearing slitting knife of double-phase mutual fork. The sheet plastic body chopping device is simple in structure, can be used for firstly chopping plastic into strips and then chopping the plastic into blocks so as to form a raw material for granulating regenerated plastic, and is stable and orderly in work, high in efficiency and strong in adaptability.

Description

Sheet-shaped plastic body chopping device

Technical Field

The utility model relates to a slice plastic body comminution device, the mainly used melts the breakage of nature plastics.

Background

The plastic products in the world are widely used, such as ships and engineering machinery, plastic bags and label paper, and the convenience of the plastic products is not questioned. However, the properties of plastics determine that the plastics are very slowly weathered and degraded in natural environment, and cannot be completely removed for hundreds of years, so that serious environmental pollution is caused, and the treatment of waste plastics also becomes a worldwide problem.

The recycling of the waste plastics is an effective treatment method. Aiming at recycling (recycling) of hot-melt waste plastics, the scheme provides a preposed treatment device for granulation of the recycling plastics so as to facilitate the chopping operation of the plastics.

SUMMERY OF THE UTILITY MODEL

In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a sheet-like plastic body shredding device.

In order to solve the technical problem, the technical scheme of the utility model is that: the utility model provides a slice plastic body comminution device, includes slitting wheelset, dicing cutter subassembly that top-down set gradually, and the slitting wheelset includes the slitting wheel of two mutual unsmooth interlocks, and the equal axial equipartition in week portion of slitting wheel has a plurality of annular bellied annular slitting sword, and dicing cutter subassembly includes the dicing sword of two mutual intercrossing shears.

Preferably, the slitting wheelset is located inside the casing, and the inside from last rolling wheelset, slitting wheelset that have set gradually down of casing.

Preferably, a conveying belt for receiving materials is arranged below the dicing cutter assembly, and a feeding hopper with a wide upper part and a narrow lower part is arranged at the top of the shell.

Preferably, the tearing and rolling wheel group comprises a first tearing and rolling wheel and a second tearing and rolling wheel, the first tearing and rolling wheel and the second tearing and rolling wheel are grooved wheels of short-tooth gears which are meshed with each other, and a certain gap is formed between the first tearing and rolling wheel and the second tearing and rolling wheel.

Preferably, roll the wheelset and include first rolling wheel and second rolling wheel, have between first rolling wheel and the second rolling wheel and roll the clearance and all surperficial annular knurl.

Preferably, the slitting wheel set comprises a first slitting wheel and a second slitting wheel, a plurality of annular slitting knives protruding in an annular shape are axially and uniformly distributed on the peripheries of the first slitting wheel and the second slitting wheel, the annular slitting knives of the first slitting wheel are meshed with the annular concave part between the two annular slitting knives of the second slitting wheel, and the annular slitting knives of the second slitting wheel are meshed with the annular concave part between the two annular slitting knives of the first slitting wheel.

Preferably, the cutting knife assembly comprises a fixed cutting knife arranged on the rack and a sliding cutting knife arranged on the fixed guide rail, the two cutting knives are arranged in parallel, the gap is small, and the cutting edges of the fixed cutting knife and the sliding cutting knife are crossed and sheared below the meshing position of the first slitting wheel and the second slitting wheel in the slitting wheel set so as to cut the strip-shaped plastic into blocks.

Preferably, a blocking and receiving plate is arranged on the rack between the cutting knife assembly and the slitting wheel set, is positioned above the cross shearing position of the fixed cutting knife and the sliding cutting knife and inclines towards the sliding cutting knife from top to bottom.

Preferably, tear and roll the wheelset, slitting wheelset, stripping knife subassembly through the electric drive mechanism drive, tear and roll the wheelset and include that first tear and roll the wheel with the second tear, roll the wheelset and include first rolling wheel and second rolling wheel, slitting wheelset includes first slitting wheel and second slitting wheel, and the stripping knife subassembly includes fixed stripping knife and slip stripping knife, wherein: the first tearing and rolling wheel is arranged on the shaft I, the second tearing and rolling wheel is arranged on the shaft II, the second rolling wheel is arranged on the shaft III, the first rolling wheel is arranged on the shaft IV, the first slitting wheel is arranged on the shaft V, and the second slitting wheel is arranged on the shaft VI; the electric mechanism comprises a low-speed motor, the low-speed motor is transmitted to a shaft I through a small belt pulley in a variable speed mode, one end of the shaft I is provided with a large belt pulley which is wound and connected with the small belt pulley through a belt to play a role of an energy storage flywheel, the inner side of the large belt pulley is provided with a shaft I force transmission gear, the other end of the shaft I is provided with a shaft I transmission gear which is meshed with a shaft II transmission gear on the shaft II, and the first tearing-rolling wheel and the second tearing-rolling wheel are guaranteed to rotate at the; the first rolling wheel and the second rolling wheel rotate in the same direction, and the first rolling wheel and the second rolling wheel rotate in the same direction; the IV-shaft force transmission gear is meshed with a V-shaft force transmission gear at one end of a V-shaft to transmit power, the transmission ratio of the force transmission gears is controlled to ensure that the linear speed of the slitting wheel is greater than that of the rolling wheel, a V-shaft transmission gear is arranged at the other end of the V-shaft and meshed with a VI-shaft transmission gear of the VI-shaft, and the first slitting wheel and the second slitting wheel are ensured to rotate at the same speed and rotate in opposite directions; the power of the sliding block cutter is from a V-axis force transmission gear II, the V-axis force transmission gear II is arranged on a V-axis beside the V-axis force transmission gear I, the V-axis force transmission gear II is meshed with a VII-axis force transmission gear on a VII-axis in the frame, two ends of the VII-axis are respectively provided with an eccentric pin shaft disc, the eccentric distance of the eccentric pin shaft ensures that the sliding block cutter and the plastic strip have impact force when meeting with the fixed block cutter, the stroke is enough to cut off the plastic strips, the eccentric pin shafts on the eccentric pin shaft disc are all hinged with a connecting rod, the other ends of the connecting rods are all hinged with the pin shafts on the tool rest of the sliding block cutter, the tool rest of the sliding block cutter is arranged on a fixed guide rail to form a crank-slider mechanism, so that power is transmitted to the VII shaft from the V shaft to drive the eccentric pin shafts to pull the sliding block cutter through the connecting rods, the plastic strip from the slitting wheel is cut into strips of a certain size under the action of the sliding slitting knife and the fixed slitting knife.

Preferably, the bearing seat of the shaft III is installed on a dovetail groove sliding block, the dovetail groove sliding block is embedded in a dovetail groove of a rack, a pressing plate is fixedly arranged at the tail end of the dovetail groove fixed on the rack, prepressed strong elastic plastic is installed between the pressing plate and the tail of the dovetail groove sliding block, installation through holes are coaxially formed in the pressing plate and the strong elastic plastic, a prepressing stud with the inner end screwed on the internal threaded hole is arranged in the installation through hole of the pressing plate and the strong elastic plastic in a penetrating mode, a pressing nut tightly pressing the outer side of the pressing plate is screwed at the outer end of the prepressing stud, double pressing nuts are adopted for preventing looseness, the gap between the grinding wheels on the shaft III and the shaft IV is kept to be 2-3mm during installation, a strong elastic sliding abdicating space of 4-5mm is.

Compared with the prior art, the utility model discloses following beneficial effect has: the sheet plastic body chopping device is simple in structure, can be used for firstly chopping plastic into strips and then chopping the plastic into blocks so as to form a raw material for granulating regenerated plastic, and is stable and orderly in work, high in efficiency and strong in adaptability.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

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

Fig. 2 is a transmission diagram of the embodiment of the present invention.

Fig. 3 is a drive schematic of the dicing blade assembly.

FIG. 4 is a first schematic view of the bearing seat installation of the shaft III.

FIG. 5 is a second schematic view of the bearing seat installation of the shaft III.

Fig. 6 is a top view of the slitting wheel set.

Fig. 7 is a partially enlarged view a of fig. 6.

Detailed Description

In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

As shown in fig. 1-7, a sheet-shaped plastic body chopping device comprises a slitting wheel set and a chopping knife assembly 5 which are sequentially arranged from top to bottom, wherein the slitting wheel set comprises two mutually concave-convex meshed slitting wheels, a plurality of annular protruded slitting knives are axially and uniformly distributed on the periphery of the slitting wheel, and the chopping knife assembly comprises two mutually crossed and sheared chopping knives.

The embodiment of the utility model provides an in, inside the slitting wheelset was located casing 1, inside from last down having set gradually the tear and roll wheelset 2, roll wheelset 3, slitting wheelset 4 of casing.

The embodiment of the utility model provides an in, the below of stripping and slicing knife tackle spare is equipped with the conveyer belt 6 that is used for connecing the material, and the top of casing is provided with wide feeder hopper 7 narrow down.

The embodiment of the utility model provides an in, tear and roll wheel group and include first tear and roll wheel 8 and second tear and roll wheel 9, first tear and roll the sheave that the wheel is intermeshing's short tooth class gear with the second tear and roll, first tear and roll the wheel and tear with the second and roll and have certain clearance between the wheel.

The embodiment of the utility model provides an in, roll the wheelset including first rolling wheel 10 and second rolling wheel 11, have between first rolling wheel and the second rolling wheel and roll the clearance and all surperficial annular knurls.

In the embodiment of the present invention, the slitting wheel set includes a first slitting wheel 12 and a second slitting wheel 13, a plurality of annular protruded annular slitting knives 14 are axially and uniformly distributed around the circumference of the first slitting wheel and the second slitting wheel, the annular slitting knife of the first slitting wheel engages with an annular concave portion 15 between the two annular slitting knives of the second slitting wheel, and the annular slitting knife of the second slitting wheel engages with an annular concave portion between the two annular slitting knives of the first slitting wheel.

The embodiment of the utility model provides an in, the stripping and slicing knife subassembly is including rack-mounted fixed stripping and slicing knife 16 and the slip stripping and slicing knife 17 of installing on fixed guide, and two sword parallel mount and clearance are little, and the below cross shearing of first slitting wheel and second slitting wheel meshing department in the slitting wheelset of the blade of fixed stripping and slicing knife and slip stripping and slicing knife to cut into pieces with strip plastics.

The embodiment of the utility model provides an in, be equipped with in the frame between stripping and slicing knife subassembly and the slitting wheelset and keep off and connect flitch 18, keep off and connect the flitch to be located fixed stripping and slicing knife and slip stripping and slicing knife cross shearing department's top and from last down towards slip stripping and slicing knife direction slope. The plastic strip to be processed is ensured to be positioned between the cutting edges of the fixed block cutting knife and the sliding block cutting knife so as to be convenient for block cutting.

The embodiment of the utility model provides an in, tear and roll the wheelset, the slitting wheelset, the stripping cutter subassembly through the electric mechanism drive, tear and roll the wheelset and include that first tear rolls the wheel and the second tears rolls the wheel, roll the wheelset and include first rolling wheel and second rolling wheel, the slitting wheelset includes first slitting wheel and second slitting wheel, the stripping cutter subassembly includes fixed stripping cutter and slip stripping cutter, wherein: the first tearing and rolling wheel is arranged on a shaft I19, the second tearing and rolling wheel is arranged on a shaft II 20, the second rolling wheel is arranged on a shaft III 21, the first rolling wheel is arranged on a shaft IV 22, the first slitting wheel is arranged on a shaft V23, and the second slitting wheel is arranged on a shaft VI 24; the electric mechanism comprises a low-speed motor 25, the low-speed motor is transmitted to the shaft I through a small belt pulley 26 in a variable speed mode, one end of the shaft I is provided with a large belt pulley 27 which is wound and connected with the small belt pulley through a belt to play a role of an energy storage flywheel, the inner side of the large belt pulley is provided with a force transmission gear 28 of the shaft I, the other end of the shaft I is provided with a transmission gear 29 of the shaft I to be meshed with a transmission gear 30 of the shaft II on the shaft II, and the first tearing-rolling wheel and the second tearing-rolling; the I-shaft force transmission gear is meshed with an IV-shaft force transmission gear 31 at one end of an IV shaft to transmit power, the transmission ratio of the force transmission gears is controlled to ensure that the linear speed of the rolling wheel is greater than that of the tearing and rolling wheel, an IV-shaft transmission gear 32 arranged at the other end of the IV shaft is meshed with a III-shaft transmission gear 33 on the III shaft, and the first rolling wheel and the second rolling wheel are ensured to rotate at the same speed and rotate in opposite directions; the IV-shaft force transmission gear is meshed with a V-shaft force transmission gear 34 at one end of a V-shaft to transmit power, the transmission ratio of the force transmission gear is controlled to ensure that the linear speed of the slitting wheel is slightly greater than that of the rolling wheel, a V-shaft transmission gear 35 is arranged at the other end of the V-shaft and meshed with a VI-shaft transmission gear 36 of the VI-shaft, and the first slitting wheel and the second slitting wheel are ensured to rotate at the same speed and rotate in opposite directions; the power of the sliding block cutter comes from a V-shaft force transmission gear II 37, the V-shaft force transmission gear II is arranged on a V-shaft beside the V-shaft force transmission gear I, the V-shaft force transmission gear II is meshed with a VII-shaft force transmission gear 39 on a VII-shaft 38 in the frame, two ends of the VII-shaft are respectively provided with an eccentric pin shaft disc 40, the eccentric distance of the eccentric pin shafts ensures that the sliding block cutter, the plastic strip and the fixed block cutter have impact force when meeting, and the stroke is enough to cut off the plastic strip, the eccentric pin shafts 41 on the eccentric pin shaft disc are all hinged with a connecting rod 42, the other ends of the connecting rods are all hinged with a pin shaft 44 on a tool rest 43 of the sliding block cutter, the tool rest of the sliding block cutter is arranged on a fixed guide rail 45 to form a crank-slider mechanism, so that power is transmitted to a VII shaft from a V shaft to drive the eccentric pin shafts to pull the sliding block cutter through the connecting rods, the plastic strip from the slitting wheel is cut into strips of a certain size under the action of the sliding slitting knife and the fixed slitting knife.

In the embodiment of the utility model, the diameter of the I axle and the II axle is about phi 100mm, and the rigidity and the strength are great. The tearing and rolling wheels arranged on the shaft I and the shaft II are a pair of grooved wheels similar to a large-modulus deflection short-tooth gear, the grooved wheels are subjected to heat treatment, a gap of 8mm is kept during installation, and various hollow (bottles, boxes, pipes and the like) waste plastic products are torn and flattened into corrugated sheets (the solid thickness is less than 8 mm) or fragments. The shafts III and IV have high rigidity and strength, and a pair of rolling wheels arranged on the shafts III and IV are knurled on the surfaces and subjected to nitriding and hardening treatment, so that the corrugated sheet is conveniently rolled and thinned while the friction tension is increased. The strip cutting wheel is subject to nitriding and hardening treatment, the knife edge of the outer edge of the bulge is sharp, and the side surface of the annular concave part is slightly retracted inwards. The axial clearance D1 of the concave-convex part of the slitting wheel is 0.03-0.10mm, and the radial clearance D2 of the concave-convex part is 10mm, so that the plastic thin plate is cut into strips or chips. The fixed block cutter is arranged on the frame, and the cutting edge is made of high-speed steel and is sharp in sharpening. The sliding cutting block knife is arranged on the knife rest, and the cutting edge is made of high-speed steel and is sharp in sharpening. Guarantee during the installation that clearance 0.05~0.15mm between the blade, the stroke of slip stripping and slicing sword guarantees that plastics have the impact force when meeting with fixed stripping and slicing sword, and the stripping and slicing sword blade of sliding will surpass fixed stripping and slicing sword blade more than 20mm, is enough to cut off the plastic strip.

In the embodiment of the present invention, the bearing seat 46 of the shaft iii is installed on the dovetail slider 47, the dovetail slider is embedded on the dovetail 48 of the rack, the tail end of the dovetail fixed on the rack is fixedly provided with a pressing plate 49, a pre-pressed strong elastic plastic 50 is installed between the pressing plate and the tail of the dovetail slider, the pressing plate and the strong elastic plastic are coaxially provided with an installation through hole, the dovetail slider is provided with an internal thread hole, a pre-pressing stud 51 with an inner end screwed on the internal thread hole is penetrated in the installation through hole of the pressing plate and the strong elastic plastic, an outer end of the pre-pressing stud is screwed with a pressing nut 52 tightly pressing the outer side of the pressing plate, and double pressing nuts are adopted for locking, the gap between the rolling wheels of the shaft iii and the shaft iv is kept for 2-3mm during installation, and a strong elastic sliding abdicating space.

A working method of a sheet-shaped plastic body chopping device comprises the following steps: sorting (not mixing as much as possible) various waste plastic products (except large and thick parts) such as waste plastic pipes, bottles, boxes, barrels, ropes, nets and the like purchased by a recycling company according to the types of plastics (polyethylene (PE), polypropylene (PP), Polystyrene (PS), polyvinyl chloride (PVC) and the like), putting or conveying the waste plastic products into a feed hopper in batches, rolling, eating, tearing and rolling into corrugated sheets by a pair of tearing and rolling wheels, and then rolling; the pair of rolling wheels further rolls and thins the corrugated sheets, and then the corrugated sheets enter the slitting process; a pair of slitting wheels cut the slices into strips just like cutting noodles, and then the slices enter the slicing machine; the cutting edges of the two slicing knives are cut into small pieces in a crossed way, and then the small pieces are sent to a material receiving conveyer belt below the device for dedusting and cleaning.

The present invention is not limited to the above preferred embodiments, and any person can obtain other various types of sheet-shaped plastic body chopping devices according to the teaching of the present invention. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims

1. A slice plastic body comminution device which characterized in that: the cutting device comprises a slitting wheel set and a dicing cutter assembly which are sequentially arranged from top to bottom, wherein the slitting wheel set comprises two mutually concave-convex meshed slitting wheels, a plurality of annular convex annular slitting cutters are axially and uniformly distributed on the periphery of the slitting wheel, and the dicing cutter assembly comprises two mutually crossed and sheared dicing cutters.

2. A device for shredding sheet plastic bodies according to claim 1, characterized in that: the slitting wheelset is located inside the casing, and the casing is inside to be provided with in proper order from last to roll the wheelset, roll wheelset, slitting wheelset.

3. A device for shredding sheet plastic bodies according to claim 2, characterized in that: the lower side of the dicing cutter component is provided with a conveying belt for receiving materials, and the top of the shell is provided with a feeding hopper which is wide at the top and narrow at the bottom.

4. A device for shredding sheet plastic bodies according to claim 2, characterized in that: the tearing and rolling wheel group comprises a first tearing and rolling wheel and a second tearing and rolling wheel, the first tearing and rolling wheel and the second tearing and rolling wheel are grooved wheels of short-tooth gears which are meshed with each other, and a certain gap is formed between the first tearing and rolling wheel and the second tearing and rolling wheel.

5. A device for shredding sheet plastic bodies according to claim 2, characterized in that: the rolling wheel set comprises a first rolling wheel and a second rolling wheel, and a rolling gap and a uniform surface knurling are formed between the first rolling wheel and the second rolling wheel.

6. A device for shredding sheet plastic bodies according to claim 1, characterized in that: the strip cutting wheel set comprises a first strip cutting wheel and a second strip cutting wheel, a plurality of annular raised strip cutting knives are axially and uniformly distributed on the peripheries of the first strip cutting wheel and the second strip cutting wheel, the annular strip cutting knives of the first strip cutting wheel are meshed with an annular concave part between the two annular strip cutting knives of the second strip cutting wheel, and the annular strip cutting knives of the second strip cutting wheel are meshed with an annular concave part between the two annular strip cutting knives of the first strip cutting wheel.

7. A device for shredding sheet plastic bodies according to claim 1, characterized in that: the cutting knife component comprises a fixed cutting knife arranged on the rack and a sliding cutting knife arranged on a fixed guide rail, the two cutting knives are arranged in parallel, and the cutting edges of the fixed cutting knife and the sliding cutting knife are crossed and sheared below the meshing position of a first slitting wheel and a second slitting wheel in a slitting wheel set so as to shear the strip-shaped plastic into blocks.

8. A device for shredding sheet plastic bodies according to claim 7, characterized in that: and a blocking and receiving plate is arranged on the rack between the cutting knife assembly and the slitting wheel set, is positioned above the cross shearing position of the fixed cutting knife and the sliding cutting knife and inclines towards the sliding cutting knife from top to bottom.

9. A device for shredding sheet plastic bodies according to claim 2, characterized in that: tear and roll the wheelset, slitting wheelset, stripping knife tackle spare and drive through electric mechanism, tear and roll the wheelset and include that first tear and roll the wheel and the second tears and roll the wheel, roll the wheelset and include first rolling wheel and second rolling wheel, slitting wheelset includes first slitting wheel and second slitting wheel, and stripping knife tackle spare includes fixed stripping knife and slip stripping knife, wherein: the first tearing and rolling wheel is arranged on the shaft I, the second tearing and rolling wheel is arranged on the shaft II, the second rolling wheel is arranged on the shaft III, the first rolling wheel is arranged on the shaft IV, the first slitting wheel is arranged on the shaft V, and the second slitting wheel is arranged on the shaft VI; the electric mechanism comprises a low-speed motor, the low-speed motor is transmitted to a shaft I through a small belt pulley in a variable speed mode, one end of the shaft I is provided with a large belt pulley which is wound and connected with the small belt pulley through a belt to play a role of an energy storage flywheel, the inner side of the large belt pulley is provided with a shaft I force transmission gear, the other end of the shaft I is provided with a shaft I transmission gear which is meshed with a shaft II transmission gear on the shaft II, and the first tearing-rolling wheel and the second tearing-rolling wheel are guaranteed to rotate at the; the first rolling wheel and the second rolling wheel rotate in the same direction, and the first rolling wheel and the second rolling wheel rotate in the same direction; the IV-shaft force transmission gear is meshed with a V-shaft force transmission gear at one end of a V-shaft to transmit power, the transmission ratio of the force transmission gears is controlled to ensure that the linear speed of the slitting wheel is greater than that of the rolling wheel, a V-shaft transmission gear is arranged at the other end of the V-shaft and meshed with a VI-shaft transmission gear of the VI-shaft, and the first slitting wheel and the second slitting wheel are ensured to rotate at the same speed and rotate in opposite directions; the power of the sliding block cutter is from a V-axis force transmission gear II, the V-axis force transmission gear II is arranged on a V-axis beside the V-axis force transmission gear I, the V-axis force transmission gear II is meshed with a VII-axis force transmission gear on a VII-axis in the frame, two ends of the VII-axis are respectively provided with an eccentric pin shaft disc, the eccentric distance of the eccentric pin shaft ensures that the sliding block cutter and the plastic strip have impact force when meeting with the fixed block cutter, the stroke is enough to cut off the plastic strips, the eccentric pin shafts on the eccentric pin shaft disc are all hinged with a connecting rod, the other ends of the connecting rods are all hinged with the pin shafts on the tool rest of the sliding block cutter, the tool rest of the sliding block cutter is arranged on a fixed guide rail to form a crank-slider mechanism, so that power is transmitted to the VII shaft from the V shaft to drive the eccentric pin shafts to pull the sliding block cutter through the connecting rods, the plastic strip from the slitting wheel is cut into strips of a certain size under the action of the sliding slitting knife and the fixed slitting knife.

10. A device for shredding sheet plastic bodies according to claim 9, characterized in that: the bearing block of the shaft III is arranged on a dovetail groove sliding block, the dovetail groove sliding block is embedded on a dovetail groove of a rack, a pressing plate is fixedly arranged at the tail end of the dovetail groove fixed on the rack, prepressed strong elastic plastic is arranged between the pressing plate and the pressing plate fixedly arranged on the dovetail groove at the tail of the dovetail groove sliding block, an installation through hole is coaxially arranged on the pressing plate and the strong elastic plastic, a prepressing stud with the inner end screwed on the internal threaded hole is arranged in the installation through hole of the pressing plate and the strong elastic plastic in a penetrating way, the outer end of the prepressing stud is screwed with a pressing nut tightly pressed on the outer side of the pressing plate and adopts a double pressing nut to prevent looseness, the rolling gap of the pressing wheels on the shaft III and the shaft IV is kept to be 2-3mm during installation, a strong elastic sliding abdicating.