CN212636362U - Pressure shaping tractor for production line of hollow EVA (ethylene vinyl acetate) mesh iron sheet - Google Patents

Abstract

The utility model relates to a pressure shaping tractor for a production line of cavity EVA mesh-sandwiched iron sheet, which comprises an air-vent valve, a hand valve, a frequency converter, a frame, an upper frame, a guide pillar, a cylinder, an upper conveyer belt device and a lower conveyer belt device; the upper conveyor belt device comprises a tensioning device I, a motor I, a bearing seat I, a motor bearing seat I, a transmission roller I, a conveyor belt I and a blower I; the lower conveyor belt device comprises a motor II, a bearing block II, a motor bearing block II, a transmission roller II, a conveyor belt II, a blower II and a tensioning device II; four guide posts and a lower conveying belt device are fixed on the frame; the upper conveyor belt device is arranged on the four guide posts, and push rods of two cylinders of the upper rack of the upper conveyor belt device are in contact with the transverse plate; the pressure regulating valve is connected with the two cylinders through a manual valve; the frequency converter is connected with the motor I and the motor II; the pressure shaping tractor provides reliable guarantee for the manufactured EVA mesh-sandwiched iron sheet to meet the design quality requirement.

Description

Pressure shaping tractor for production line of hollow EVA (ethylene vinyl acetate) mesh iron sheet

Technical Field

The utility model relates to a pressure setting tractor for cavity EVA presss from both sides mesh iron sheet production line is the supporting equipment of manufacturing EVA presss from both sides mesh iron sheet production line.

Background

Because vehicles run on various outdoor highways and tracks, vibration and noise can be generated under the influence of various conditions on the roads, and for example, various cavities of automobiles, electric vehicles, high-speed rails, subways and aircrafts can generate resonance and resonance in motion. The resonance, the sympathetic response problem that the cavity produced need a syllable-dividing inflation to glue the piece, will give sound insulation the inflation and glue the piece and fix in the cavity, and the assembly back is toasted with the high temperature of later process, and the foaming sheet that the piece was glued in the inflation that gives sound insulation begins the inflation, fully fills the cross section of cavity, plays separation resonance effect, reaches the effect of making an uproar that gives sound insulation and fall.

The sound insulation expansion rubber block in the prior art is completed by adopting a twice injection molding process, firstly, a nylon 66 framework is subjected to injection molding by an injection molding machine, a cavity for injection molding of EVA (ethylene vinyl acetate) foaming material is reserved, and then, the reserved cavity is filled with the injection molding of the EVA foaming material by the injection molding machine to prepare a finished product.

Because the cavity size is not of uniform size, divide into about again, so, satisfy the syllable-dividing expanded rubber block that various cavities need, need make several sets of plastic mold, wherein secondary injection mold occupies half, and the mould expense that drops into is higher, production cycle length, and is inefficient, and product cost is high.

Therefore, it has been the subject of research and research by manufacturers to provide a sound-insulating expanded rubber block which has a simple structure, a simple and convenient process, a low cost, and effects of blocking resonance in a cavity and achieving sound insulation and noise reduction.

Disclosure of Invention

In view of prior art's situation, the utility model provides a pressure design tractor that is used for cavity EVA to press from both sides mesh iron sheet production line, pressure design tractor is the crucial corollary equipment of EVA clamp mesh iron sheet production line, injection moulding is accomplished to cooperation EVA clamp mesh iron sheet processing lines, promptly, through extrusion die with EVA foaming material cladding back on blank mesh iron sheet, cool down once more through pressure design tractor and accomplish the design, finally form EVA and press from both sides mesh iron sheet area finished product.

When the sound insulation and noise reduction device is used, the sound insulation and noise reduction device is punched into different shapes according to the shape of the cavity, is arranged in the cavity, and expands and foams at high temperature through EVA to play a role in isolating resonance, so that the sound insulation and noise reduction effects are achieved.

The utility model discloses a realize above-mentioned purpose, the technical scheme who adopts is: the utility model provides a pressure design tractor that is used for cavity EVA to press from both sides mesh iron sheet production line which characterized in that: the pressure shaping tractor comprises a pressure regulating valve, a manual valve, a frequency converter, a rack, an upper rack, a guide pillar, a cylinder, an upper conveyer belt device and a lower conveyer belt device;

the upper conveyor belt device comprises a tensioning device I, a motor I, a bearing seat I, a motor bearing seat I, a transmission roller I, a conveyor belt I and a blower I;

the lower conveying belt device comprises a motor II, a bearing block II, a motor bearing block II, a transmission roller II, a conveying belt II, a blower II and a tensioning device II;

the upper surface of the rack is respectively and sequentially fixed with two motor bearing seats I, four guide pillars and two tensioning devices I at intervals, dovetail-shaped protrusions I of the two bearing seats I are respectively arranged in dovetail grooves I of slideways I of the two tensioning devices I, and the bottom surface of each dovetail-shaped protrusion I is respectively fixed with a screw nut I meshed with a screw I of the tensioning device I;

a transverse plate is fixed between the four guide posts, and a motor I is fixed on the rack on one side of the motor bearing seat I;

a transmission roller I is respectively arranged between two motor bearing blocks I which are symmetrically arranged at intervals and between two bearing blocks I which are symmetrically arranged at intervals, leading guide shafts on two sides of each transmission roller I are respectively arranged in bearings on the two motor bearing blocks I and bearings on the two bearing blocks I, a shaft of the transmission roller I is connected with a rotating shaft of a motor I,

the conveyor belt I is tightly sleeved on two transmission rollers I which are symmetrically arranged at intervals, and a blower I is fixed on a central hole I below the rack;

two motor bearing blocks II, two air cylinders and two tensioning devices II are sequentially fixed below the upper rack at intervals, dovetail-shaped protrusions II of the two bearing blocks II are respectively arranged in dovetail grooves II of slideways II of the two tensioning devices II, and the bottom surface of each dovetail-shaped protrusion II is respectively fixed with a screw nut II meshed with a screw II of the tensioning device II;

a motor II is fixed below the upper frame on one side of the motor bearing seat II, a transmission roller II is respectively arranged between two motor bearing seats II which are symmetrically arranged at intervals and between two bearing seats II which are symmetrically arranged at intervals, leading guide shafts on two sides of the two transmission rollers II are respectively arranged in bearings on the two motor bearing seats II and in the two bearings of the two motor bearing seats II, the shaft of the transmission roller II is connected with a rotating shaft of the motor II, the conveying belt II is tightly sleeved on the two transmission rollers II which are symmetrically arranged at intervals, and a blower II is fixed on a central hole II on the upper frame;

the upper frame is arranged on the four guide posts, the sliding posts at the upper ends of the four guide posts are correspondingly arranged in the four guide sleeves of the upper frame, and the push rods of the two cylinders are in contact fit with the transverse plate;

the pressure regulating valve is respectively connected with the two cylinders through manual valves;

the frequency converter is respectively connected with the motor I and the motor II;

the pressure regulating valve sets pressure, and the manual valve operates the lifting of the two cylinders to enable the upper frame to drive the bearing seat II and the motor bearing seat II to drive the conveying belt II on the transmission roller I to ascend or descend so as to achieve the purpose of regulating the distance between the conveying belt I and the conveying belt II;

the polygonal end of a lead screw I of a tensioning device I is rotated clockwise or anticlockwise, and the end of the lead screw I is matched with a lead screw nut I to drive a transmission roller I of a bearing seat I to move, so that the tightness of a conveyor belt I is adjusted;

clockwise or II polygon ends of II lead screws of anticlockwise rotation overspeed device tensioner, through II lead screw ends of lead screw and II cooperations of screw nut, drive II driving drum of bearing frame and remove, realize the elasticity of adjustment conveyer belt II.

The utility model is characterized in that: the pressure sizing tractor is a key corollary device for producing qualified EVA mesh iron sheet materials by an EVA mesh iron sheet production line, and after an EVA foaming material is coated on a blank mesh iron sheet by an extrusion die, the EVA mesh iron sheet materials can be finally formed into an EVA mesh iron sheet finished product by cooling and sizing through the pressure sizing tractor.

The pressure shaping tractor provides reliable guarantee for the finally manufactured EVA mesh-sandwiched iron sheet to meet the design quality requirement.

The EVA mesh-sandwiched iron sheet is formed by one-time injection molding through a production line, has simple structure and simple and convenient process, replaces the process of injection molding nylon 66 frameworks and secondary injection molding EVA by a plurality of injection molding machines in the prior art, saves labor, material resources and finished product cost, and improves the production efficiency by more than 60 percent.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a side view of the structure of FIG. 2;

FIG. 3 is a schematic structural diagram of the connection between a bearing seat I and a tensioning device I of the present invention;

FIG. 4 is a cross-sectional view of the structure of FIG. 3;

FIG. 5 is a schematic structural diagram of the connection between the bearing seat II and the tensioning device II of the present invention;

FIG. 6 is a cross-sectional view of the structure of FIG. 5;

FIG. 7 is a view showing a usage state of the present invention;

FIG. 8 is a schematic structural view of an EVA mesh-sandwiched iron sheet to be processed.

Detailed Description

As shown in fig. 1 to 8, the pressure setting tractor 8 of the pressure setting tractor for the production line of the cavity EVA mesh-sandwiched iron sheet comprises a pressure regulating valve 1-1, a hand valve 1-2, a frequency converter 1-3, a frame 1-4, an upper frame 1-5, a guide post 1-6, a cylinder 1-7, an upper conveyor belt device and a lower conveyor belt device.

The upper conveying belt device comprises a tensioning device I1-8, a motor I1-9, a bearing seat I1-10, a motor bearing seat I1-11, a transmission roller I1-12, a conveying belt I1-13 and a blower I1-14.

The lower conveyor belt device comprises a motor II 1-15, a bearing seat II 1-16, a motor bearing seat II 1-17, a transmission roller II 1-18, a conveyor belt II 1-19, a blower II 1-20 and a tensioning device II 1-21.

Two motor bearing blocks I1-11, four guide posts 1-6 and two tensioning devices I1-8 are respectively fixed on a rack 1-4 at intervals in sequence, dovetail-shaped protrusions I1-10-1 of the two bearing blocks I1-10 are respectively arranged in dovetail grooves I1-8-1-1 of slideways I1-8-1 of the two tensioning devices I1-8, and the bottom surface of each dovetail-shaped protrusion I1-10-1 is respectively fixed with a screw nut I1-8-4 meshed with a screw I1-8-2 of the tensioning device I1-8.

Transverse plates 1-6-2 are fixed among the four guide posts 1-6, motors I1-9 are fixed on a rack 1-4 on one side of motor bearing blocks I1-11, a transmission roller I1-12 is respectively arranged between two motor bearing blocks I1-11 which are symmetrically arranged at intervals and between two bearing blocks I1-10 which are symmetrically arranged at intervals, two main guide shafts on two sides of each transmission roller I1-12 are respectively arranged in bearings on the two motor bearing blocks I1-11 and bearings on the two bearing blocks I1-10, the shafts of the transmission rollers I1 to 12 are connected with the rotating shaft of the motor I1 to 9, the conveyor belts I1 to 13 are tightly sleeved on the two transmission rollers I1 to 12 which are symmetrically arranged at intervals, a blower I1-14 is fixed on a center hole I1-4-1 below the frame 1-4.

Two motor bearing blocks II 1-17, two air cylinders 1-7 and two tensioning devices II 1-21 are respectively fixed below the upper rack 1-5 at intervals in sequence, dovetail-shaped protrusions II 1-16-1 of the two bearing blocks II 1-16 are respectively arranged in dovetail grooves II 1-21-1-1 of slideways II 1-21-1 of the two tensioning devices II 1-21, and the bottom surface of each dovetail-shaped protrusion II 1-16-1 is respectively fixed with a screw nut II 1-21-4 meshed with a screw II 1-21-2 of the tensioning device II 1-21; the motor II 1-15 is fixed below the upper frame 1-5 on one side of the motor bearing blocks II 1-17, the two motor bearing blocks II 1-17 which are symmetrically arranged at intervals and the two bearing blocks II 1-16 which are symmetrically arranged at intervals are respectively provided with a transmission roller II 1-18, the main guide shafts on two sides of the two transmission rollers II 1-18 are respectively arranged in the bearings on the two motor bearing blocks II 1-17 and the two motor bearing blocks II 1-16, and the shafts of the transmission rollers II 1-18 are connected with the rotating shafts of the motor II 1-15.

The conveyor belts II 1-19 are tightly sleeved on two transmission rollers II 1-18 which are symmetrically arranged at intervals, and a blower II 1-20 is fixed on a central hole II 1-5-1 on the upper rack 1-5.

An upper frame 1-5 is placed on four guide posts 1-6, sliding posts 1-6-1 at the upper ends of the four guide posts 1-6 are correspondingly placed in four guide sleeves 1-5-2 of the upper frame 1-5, and push rods 1-7-1 of two cylinders 1-7 are in contact fit with a transverse plate 1-6-2; the pressure regulating valve 1-1 is respectively connected with two cylinders 1-7 through manual valves 1-2, and the frequency converter 1-3 is respectively connected with motors I1-9 and motors II 1-15.

The pressure regulating valve 1-1 sets pressure, and the manual valve 1-2 operates the lifting of the two cylinders 1-7, so that the upper frame 1-5 drives the bearing blocks II 1-16 and the motor bearing blocks II 1-17 to drive the conveyor belts II 1-19 on the transmission rollers I1-12 to ascend or descend, and the distance between the conveyor belts I1-13 and the conveyor belts II 1-19 is adjusted.

Clockwise or anticlockwise rotation overspeed device tensioner I1-8 lead screw I1-8-2 polygon end I1-8-2-1, through I1-8-2 lead screw end of lead screw and the screw nut I1-8-4 cooperation, drive bearing frame I1-10 driving roll I1-12 and remove, realize the elasticity of adjustment conveyer belt I1-13.

The polygonal end II 1-21-2-1 of the screw II 1-21-2 of the tensioning device II 1-21 is rotated clockwise or anticlockwise, and the screw end II 1-21-2 of the screw II is matched with the screw nut II 1-21-4 to drive the transmission roller II 1-18 of the bearing seat II 1-16 to move, so that the tightness of the conveyor belt II 1-19 is adjusted.

The tensioning devices I1-8 and the tensioning devices II 1-21 are identical in structure.

The tensioning device I1-8 comprises a slideway I1-8-1, a screw I1-8-2, a screw nut I1-8-4 and a screw nut I1-8-4;

the slideway I1-8-1 is a cuboid, a dovetail groove I1-8-1-1 is arranged on the surface along the length of the slideway I1-8-1, a screw nut I1-8-4 is fixed on one side surface of the slideway I1-8-1, one end of the screw I1-8-2 is a polygonal end I1-1-2-1, the other end is a screw end with the diameter smaller than the polygonal end I1-1-2-1, an optical axis is arranged between the screw end and the polygonal end I1-1-2-1, the optical axis of the screw I1-8-2 is arranged in a gap I1-1-3-1 of the screw nut I1-8-4, the screw rod end is arranged in the dovetail groove I1-8-1-1 and is in threaded connection with the screw rod nut I1-8-4.

The tensioning device II 1-21 comprises a slideway II 1-21-1, a screw II 1-21-2, a baffle II 1-21-3 and a screw nut II 1-21-4;

the slideway II 1-21-1 is a cuboid, a dovetail groove II 1-21-1-1 is arranged on the surface along the length of the slideway II 1-21-1, a baffle II 1-21-3 is fixed on one side surface of the slideway II 1-21-1, one end of a screw II 1-21-2 is a polygonal end II 1-21-2-1, the other end is a screw end with the diameter smaller than the polygonal end II 1-21-2-1, an optical axis is arranged between the screw end and the polygonal end II 1-21-2-1, the optical axis of the screw II 1-21-2 is arranged in a gap II 1-21-3-1 of the baffle II 1-21-3, the screw rod end is arranged in the dovetail groove II 1-21-1-1 and is in threaded connection with the screw rod nut II 1-1-4.

The mouth mold 6-7 is rectangular, the discharge port III 6-7-1 of the mouth mold 6-7 is rectangular, and the height of the discharge port III 6-7-1 on the inner surface of the mouth mold 6-7 is greater than that of the discharge port III 6-7-1 on the outer surface of the mouth mold 6-7.

A use method of a mesh iron sheet guide rail for an automobile EVA mesh iron sheet production line comprises the following steps: fixing the mesh iron sheet guide rail 5 on a base of an extruder 4 through four frame columns of a frame, and connecting an extrusion die 6 with an EVA material outlet flange 4-2 of the extruder 4d through a flange;

winding the qualified blank mesh iron sheet 8-1 on a material tray of a winding machine 9 sequentially through a compression roller of a leveling machine 3, a plurality of monomer rails 5-1 on a mesh iron sheet guide rail 5, an extrusion die 6, an air cooling device 7 and a pressure shaping tractor 1;

adjusting the tightness of an upper conveyor belt device of a pressure setting tractor 1, clockwise or anticlockwise rotating a polygonal end I1-8-2-1 of a screw I1-8-2 of a tensioning device I1-8, and driving a transmission roller I1-12 of a bearing seat I1-10 to move by matching the screw end of the screw I1-8-2 with a screw nut I1-8-4 to adjust the tightness of a conveyor belt I1-13;

adjusting the tightness of a lower conveyor belt device, namely clockwise or anticlockwise rotating a screw II 1-21 of a tensioning device II 1-21-2 to form a polygonal end II 1-21-2-1, and driving a bearing seat II 1-16 to drive a roller II 1-18 to move by matching the screw end of the screw II 1-21-2 with a screw nut II 1-21-4 so as to adjust the tightness of the conveyor belt II 1-19;

adjusting the distance between an upper conveyor belt device and a lower conveyor belt device, setting pressure by a pressure regulating valve 1-1, operating and adjusting the lifting of push rods 1-7-1 of two air cylinders 1-7 through a manual valve 1-2, pushing the transverse plates 1-6-2 by the push rods 1-7-1 of the two air cylinders 1-7 when the push rods 1-7-1 are extended, so that an upper frame 1-5 moves upwards, and conversely, moving the upper frame 1-5 downwards when the push rods 1-7-1 of the two air cylinders 1-7 are retracted, so that the distance between the upper conveyor belt device and the lower conveyor belt device can be adjusted;

adding EVA8-2 particle raw materials into a feed inlet 4-1 of an extruder 4, flattening a blank mesh iron sheet 8-1 through a leveling machine 3, guiding the blank mesh iron sheet by a plurality of monomer rails 5-1 of a mesh iron sheet guide rail 5, and rapidly and accurately sequentially feeding the blank mesh iron sheet 8-1 into a die 6 from an iron sheet opening of the extrusion die 6, at the moment, feeding the melted EVA8-2 into the extrusion die 6 sequentially through an EVA material outlet flange 4-2 at the same time by the extruder 4 to coat the upper surface and the lower surface of the blank mesh iron sheet 8-1 to form an EVA mesh iron sheet material 8, cooling the EVA mesh iron sheet material 8 by two electric fans 7-1 of an air cooling device 7 at one time and then feeding the cooled EVA mesh iron sheet material into a pressure shaping tractor 1 between a conveyor belt I1-13 and a conveyor belt II 1-19, wherein the distance between the conveyor belt I1-13 and the conveyor, the motors I1-9 and the motors II 1-15 drive the conveyor belts I1-13) and the conveyor belts II 1-19 to rotate through the transmission rollers I1-12 and the transmission rollers II 1-18 respectively, so that the EVA clamping mesh iron sheet 8 is shaped through the conveyor belts I1-13 and the conveyor belts II 1-19, in the shaping process of the EVA clamping mesh iron sheet 8, the blowers I1-14 and the blowers II 1-20 blow cold air to the conveyor belts I1-13 and the conveyor belts II 1-19 through the central holes I1-4-1 and the central holes II 1-5-1 to cool the EVA clamping mesh iron sheet 8 for the second time, and finally, the finished EVA clamping mesh iron sheet 8 is rolled by the rolling machine 9, and the whole production process is completed.

Claims (1)

1. The utility model provides a pressure design tractor that is used for cavity EVA to press from both sides mesh iron sheet production line which characterized in that: the pressure setting tractor (1) comprises a pressure regulating valve (1-1), a manual valve (1-2), a frequency converter (1-3), a rack (1-4), an upper rack (1-5), a guide pillar (1-6), an air cylinder (1-7), an upper conveyor belt device and a lower conveyor belt device;

the upper conveyor belt device comprises a tensioning device I (1-8), a motor I (1-9), a bearing seat I (1-10), a motor bearing seat I (1-11), a transmission roller I (1-12), a conveyor belt I (1-13) and a blower I (1-14);

the lower conveying belt device comprises a motor II (1-15), bearing blocks II (1-16), motor bearing blocks II (1-17), a transmission roller II (1-18), a conveying belt II (1-19), a blower II (1-20) and a tensioning device II (1-21);

two motor bearing seats I (1-11), four guide columns (1-6) and two tensioning devices I (1-8) are sequentially fixed on the rack (1-4) at intervals, dovetail-shaped protrusions I (1-10-1) of the two bearing seats I (1-10) are respectively arranged in dovetail grooves I (1-8-1-1) of slideways I (1-8-1) of the two tensioning devices I (1-8), and the bottom surface of each dovetail-shaped protrusion I (1-10-1) is respectively fixed with a screw nut I (1-8-4) meshed with a screw I (1-8-2) of the tensioning device I (1-8);

transverse plates (1-6-2) are fixed among the four guide posts (1-6), and a motor I (1-9) is fixed on the rack (1-4) on one side of a motor bearing seat I (1-11);

the transmission device is characterized in that a transmission roller I (1-12) is respectively arranged between two motor bearing seats I (1-11) which are symmetrically arranged at intervals and between two bearing seats I (1-10) which are symmetrically arranged at intervals, two main guide shafts on two sides of each transmission roller I (1-12) are respectively arranged in bearings on the two motor bearing seats I (1-11) and bearings on the two bearing seats I (1-10), the shaft of the transmission roller I (1-12) is connected with a rotating shaft of a motor I (1-9), the transmission belt I (1-13) is tightly sleeved on the two transmission rollers I (1-12) which are symmetrically arranged at intervals, and a blower I (1-14) is fixed on a center hole I (1-4-1) below a rack (1-4);

two motor bearing seats II (1-17), two air cylinders (1-7) and two tensioning devices II (1-21) are sequentially fixed below the upper rack (1-5) at intervals, dovetail-shaped bulges II (1-16-1) of the two bearing seats II (1-16) are respectively placed in dovetail grooves II (1-21-1-1) of slideways II (1-21-1) of the two tensioning devices II (1-21), and the bottom surface of each dovetail-shaped bulge II (1-16-1) is respectively fixed with a screw nut II (1-21-4) meshed with a screw II (1-21-2) of the tensioning device II (1-21);

the motor II (1-15) is fixed below the upper frame (1-5) at one side of the motor bearing seat II (1-17), a transmission roller II (1-18) is respectively arranged between two motor bearing seats II (1-17) which are symmetrically arranged at intervals and between two bearing seats II (1-16) which are symmetrically arranged at intervals, the main guide shafts at two sides of the two transmission rollers II (1-18) are respectively arranged in the bearings on the two motor bearing seats II (1-17) and the bearings of the two motor bearing seats II (1-16), the shafts of the driving rollers II (1-18) are connected with the rotating shaft of the motor II (1-15), the conveyor belts II (1-19) are tightly sleeved on two transmission rollers II (1-18) which are symmetrically arranged at intervals, a blower II (1-20) is fixed on a central hole II (1-5-1) on the upper rack (1-5);

the upper rack (1-5) is arranged on the four guide posts (1-6), the sliding posts (1-6-1) at the upper ends of the four guide posts (1-6) are correspondingly arranged in the four guide sleeves (1-5-2) of the upper rack (1-5), and the push rods (1-7-1) of the two cylinders (1-7) are in contact fit with the transverse plate (1-6-2);

the pressure regulating valve (1-1) is respectively connected with the two cylinders (1-7) through manual valves (1-2);

the frequency converters (1-3) are respectively connected with the motors I (1-9) and the motors II (1-15);

the pressure is set by the pressure regulating valve (1-1), the manual valve (1-2) operates the lifting of the two cylinders (1-7), so that the upper frame (1-5) drives the bearing blocks II (1-16) and the motor bearing blocks II (1-17) to lift or lower the conveyor belts II (1-19) on the transmission rollers I (1-12), and the distance between the conveyor belts I (1-13) and the conveyor belts II (1-19) is adjusted;

clockwise or anticlockwise rotating a tensioning device I (1-8), a lead screw I (1-8-2) polygonal end I (1-8-2-1), and driving a bearing seat I (1-10) transmission roller I (1-12) to move by matching the lead screw end of the lead screw I (1-8-2) with a lead screw nut I (1-8-4), so that the tightness of a conveyor belt I (1-13) is adjusted;

clockwise or anticlockwise rotating the tensioning device II (1-21) and the lead screw II (1-21-2) and the polygonal end II (1-21-2-1), and driving the bearing seat II (1-16) and the transmission roller II (1-18) to move by matching the lead screw end of the lead screw II (1-21-2) with the lead screw nut II (1-21-4), so that the tightness of the conveyor belt II (1-19) is adjusted.

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