CN112369226A

CN112369226A - Straw chopper

Info

Publication number: CN112369226A
Application number: CN202011298059.5A
Authority: CN
Inventors: 赵会军; 赵金晖
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-02-19

Abstract

The invention relates to a straw chopper.A movable cutter roll comprises a plurality of cutter heads with sawteeth on the circumference along the axial direction, movable cutters are arranged at the ends of the sawteeth on the cutter heads, and the movable cutters of adjacent cutter heads are separated by a certain distance; the static knife group comprises a plurality of static knives which are also separated by a certain distance; the movable cutter roller is rotated, the movable cutter point and the static cutter point on the side edge of each movable cutter adjacent to the static cutter form continuous shearing motion, the entering straw is cut into pieces according to a preset length, and the cut straw is conveyed out by a discharge belt conveyor. The invention solves the technical problems of large processing capacity, uniform and consistent chopped finished products and high energy efficiency ratio required by the industry using grass plants as raw materials.

Description

Straw chopper

Technical Field

The invention belongs to machinery in the field of straw chopping and processing, and relates to a straw chopper.

Background

The existing straw crusher, crusher and the like mostly strike raw materials by rollers rotating at high speed to produce crushed products, generally have small processing capacity, and the crushed finished products are not uniform and produce a large amount of powder.

At present, industries such as power plants, paper mills, environmental protection and the like taking grass plants as raw materials are rapidly developed, and an industrial straw chopper which is matched with the industries and has large processing capacity and uniform and consistent chopped finished products is urgently needed.

Disclosure of Invention

The invention aims to provide a straw chopper, which solves the technical problems of large processing capacity, uniform and consistent chopped finished products and high energy efficiency ratio required by the industry using grass plants as raw materials.

The purpose of the invention is realized by the following technical scheme:

a straw chopper, comprising: the automatic feeding device comprises a main motor, a large-torque speed reducer, a movable cutter roller, a static cutter set, a feeder, a discharging belt conveyor and a hopper, wherein the feeder supplies materials to the movable cutter roller;

the movable cutter roller comprises a plurality of cutter heads with sawteeth on the circumference along the axial direction, each sawteeth end on each cutter head is provided with a movable cutter, and the movable cutters of adjacent cutter heads are separated by a certain distance; the static knife group comprises a plurality of static knives which are also separated by a certain distance;

the movable knife and the static knife are arranged on the axial vertical plane in a crossed manner, the static knife group and the movable knife roller are arranged in parallel in the axial direction, the movable knife and the static knife are sequentially arranged in an interval manner one by one in the axial plane, the movable knife and the static knife enter a gap which is separated from each other, and the side faces are closely adjacent and tangent in a scissor type manner;

the movable cutter roller is rotated, the movable cutter point and the static cutter point on the side edge of each movable cutter adjacent to the static cutter form continuous shearing motion, the entering straw is cut into pieces according to a preset length, and the cut straw is conveyed out by a discharge belt conveyor.

The moving knife roll comprises: the main shaft, the cutter head, the movable cutter and the pin shaft;

the moving blade comprises: the movable knife comprises a movable knife convex rib, a pin shaft hole, a knife claw, a movable knife body and a movable knife tip;

the movable knife is a strip-shaped body with convex ribs on the back, the main body is a movable knife body, the section of the movable knife body is T-shaped, the edges of the two longitudinal side surfaces on the front side are provided with movable knife tips which protrude outwards and are sharp, the front end of the movable knife is provided with a knife claw which is bent towards the front lower part, the middle of the back side of the movable knife is longitudinally provided with the convex ribs of the movable knife, the front part of the convex ribs of the movable knife is provided with a pin shaft hole of the movable knife, and the;

the blade disc includes: the cutter head comprises a cutter head groove, sawteeth, a cutter head pin shaft hole, a cutter head inner hole, a circular truncated cone, a cutter head body and a positioning pit;

the cutter is a disk with a certain thickness, a plurality of notches are uniformly milled on the circular outer circle of the cutter body, sawteeth are formed on the rest positions, cutter grooves and cutter pin shaft holes are arranged on the front surfaces of the sawteeth, the cutter grooves enter the outer edge of the cutter towards the end of the circle center, positioning pits for accommodating moving cutters are arranged on the outer edge of the cutter, a cutter inner hole is formed in the center of the cutter, and a protruding round table is arranged on the periphery of the cutter inner hole on one side of the cutter;

the inner end of the movable cutter is inserted into the cutter positioning pit and clamped, the convex rib of the movable cutter is inserted into the cutter groove, a pin shaft penetrates through the cutter pin shaft hole and the movable cutter pin shaft hole to be fixed, and the movable cutter is fixedly connected to the sawteeth at the front end of the cutter; each sawtooth of each cutter head is provided with a moving cutter, a plurality of cutter heads penetrate through the main shaft and are fixed in the circumferential direction through keys, and the moving cutters of adjacent cutter heads are separated by round tables at intervals to form a moving cutter roller.

The static knife tackle includes: the device comprises a static knife, a static knife rest, a rectangular beam and a flange;

the stationary knife includes: the bolt hole, the convex rib of the static cutter, the static cutter body and the static cutter point;

the static knife is a rectangular plate body with convex ribs on the back surface, the main body is a static knife body, the cross section is in a flat T shape, the edges of the two longitudinal side surfaces on the front surface are provided with outwards protruded and sharp static knife points, a plurality of through bolt holes are arranged along the longitudinal central line, and the middle of the back surface of the static knife is longitudinally provided with the convex ribs of the static knife;

the stationary blade carrier includes: a static tool rest groove, a rectangular hole, a platform and a countersunk bolt hole;

the static knife rest is a plate body with a certain thickness, a concave platform is arranged on the top surface of the front half part, the height of the platform is equal to the thickness of the static knife, a static knife rest groove is longitudinally formed in the middle of the lower surface of the platform, a plurality of countersunk bolt holes with internal threads are downwards formed along the central line of the static knife rest groove, and a rectangular hole is formed in the rear half part of the static knife rest, which is vertical to the plate body; the rectangular beam is a long beam with a rectangular outer section;

inserting the convex rib of the static knife into the groove of the static knife rest, and screwing the convex rib into the countersunk head bolt hole by a bolt penetrating through the bolt hole, wherein the static knife is fixedly connected to the static knife rest; the static knife rests are fixed with static knives, the rectangular beams penetrate through respective rectangular holes to form a static knife group in series, flanges are fixed at two ends of the rectangular beams, and the rectangular beams prevent the static knife rests from rotating in the circumferential direction to form the static knife group.

The feeding machine consists of a feeding device; the motor, the driving shaft, the action wheel, the driven shaft, from the driving wheel, the chain, the scraper blade is constituteed, and the batcher chain moves the sword and rolls the direction rotation, and the batcher scraper blade drives the material and moves the sword and roll the feed to in succession.

The widths of the static cutters and the static cutter frame are equal to the height of the circular truncated cone of the cutter head, the distance between every two static cutters is equal to the width of the moving cutter during assembly, and the static cutters can slightly slide on the static cutter frame along the longitudinal direction of the rectangular beam.

The height of the circular truncated cone of the cutter head is equal to the width of the static cutter.

The invention has the following advantages and positive effects:

the invention has the advantages of large chopping capacity, high efficiency and good quality, saves power by more than 50 percent, prolongs the service life of the cutter by more than 6 times, is convenient to maintain, saves manpower, and is safe and reliable.

Move the sword claw of sword front end, the during operation cutting material package, easily unpack, the even advancing knife roll of hugging of material ration makes the mincer high-efficient work. The movable cutter and the static cutter head are made of high-hardness high-wear-resistance high-quality alloy materials and are quickly mounted on the cutter head, and the movable cutter and the static cutter are convenient to replace.

The speed reducer with large speed ratio is adopted, the rotating speed of the movable cutter roller is very low, the movable cutter and the static cutter slowly shear and cut the raw materials instead of striking the raw materials at high speed, so that the uniformity and consistency of cut finished products can be ensured, the energy efficiency ratio is high, the powder generation is reduced, the rotating speed of the movable cutter roller is very low, the cutter abrasion is reduced, and the service life is prolonged. The multiple groups of moving cutters and the multiple groups of static cutters on the main shaft are adopted to work in a matching way, so that the requirement of high chopping capacity is met.

Similar equipment of technique in the market, certain straw shredder rolls to change with two and tears the straw, and power 500KWx2 is 1000KW for 1000KW, and productivity 20-30 t/h do not have the sword, and the crushing is rolled after the grinding, and the cost is very high, tears the quality length differently, and the quality is poor.

And a crusher on the market has 300-500 KW power, 20-30 t/h production capacity, 1480r/min rotation speed, large dust, fast abrasion of a knife, 2-15 days service life, different crushing quality and poor quality.

The straw chopper cuts straws by using the movable cutter and the static cutter, the power is 315KW, the production capacity is 30-100 t/h, the rotating speed is 35r/min, the movable cutter and the static cutter can be replaced, the service life of the cutters is more than half a year, the chopping quality is uniform and consistent, and the quality is good.

Drawings

Figure 1 is a front view of the present invention,

figure 2 is a side view of the present invention,

figure 3 is a front view of the moving knife roll,

figure 4 is a side view of the moving blade roll and the stationary blade set,

figure 5 is a front view of the stationary knife block,

figure 6 is a side view of the stationary knife block,

figure 7 is a view of the main part of the feeder,

figure 8 is a side view of the feeder,

figure 9 is an assembly view of the cutter head and the movable cutter,

figure 10 is a partial cross-sectional view of figure 9,

figure 11 is an assembled cross-sectional view of the moving blade roll and the stationary blade group,

figure 12 is a partial cross-sectional view of figure 11,

figure 13 is a cutting and shredding state diagram of the movable knife and the static knife,

figure 14 is a front view of the moving blade parts,

figure 15 is a cross-sectional view of figure 14,

figure 16 is a front view of the cutter head components,

figure 17 is a cross-sectional view of figure 16,

figure 18 is a front view of the stationary knife component,

figure 19 is a cross-sectional view of figure 18,

figure 20 is a front view of the stationary tool holder part,

fig. 21 is a top view of fig. 20.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The reference numbers in the figures are as follows:

the device comprises a main motor 1, a large-torque speed reducer 2, a moving cutter roller 3, a static cutter set 4, a feeder 5, a discharge belt conveyor 6 and a hopper 7;

the movable cutter roller 3 includes: the device comprises a main shaft 301, a cutter disc 302, a movable cutter 303 and a pin shaft 304;

the moving blade 303 includes: the movable knife convex rib 303A, the pin shaft hole 303B, the knife claw 303C, the movable knife body 303D and the movable knife tip 303E;

the cutter head 302 includes: a cutter head groove 302A, sawteeth 302B, a cutter head pin shaft hole 302C, a cutter head inner hole 302D, a circular truncated cone 302E, a cutter head body 302F and a positioning pit 302G;

the stationary blade group 4 includes: a static knife 401, a static knife rest 402, a rectangular beam 403 and a flange 404;

the stationary blade 401 includes: a bolt hole 401A, a static cutter convex rib 401B, a static cutter body 401C and a static cutter tip 401D;

the stationary blade holder 402 includes: a stationary tool holder groove 402A, a rectangular hole 402B, a platform 402C, a countersunk bolt hole 402D;

a chain 501 and a scraper 502.

The raw material of the invention can be straw, but not limited to straw, and can also be various straw wrapping materials or bulk materials such as wheat straw, corn stalk, reed and the like.

The core of the invention is that the dynamic driving movable cutter roll and the static cutter set form continuous shearing movement, and the feeding machine uniformly and continuously feeds and cuts the movable cutter roll. The movable knife roller 3 rotates, the movable knife 303 and the fixed knife 401 are arranged in a crossed mode, the fixed knife 401 is distributed on two sides of the movable knife 303, and the movable knife 303 and the fixed knife 401 form shearing motion. The cutter claw 303C has the function of loosening the material bag and raking the straw into the movable cutter made of wear-resistant alloy steel.

Referring to fig. 1 and 2:

a straw chopper, comprising: the automatic feeding device comprises a main motor 1, a large-torque speed reducer 2, a moving cutter roller 3, a static cutter set 4, a feeder 5, a discharging belt conveyor 6 and a hopper 7, wherein the feeder 5 supplies materials to the moving cutter roller 3, the main motor 1 is decelerated by the large-torque speed reducer 2 to drive the moving cutter roller 3 to rotate, and the moving cutter roller 3 and the static cutter set 4 are arranged in the hopper 7;

referring to fig. 3 to 4, 9 to 17:

the movable cutter roller 3 comprises a plurality of cutter heads 302 with saw teeth on the circumference, which are arranged along the axial direction, each saw tooth end on each cutter head 302 is provided with a movable cutter 303, and the movable cutters 303 of adjacent cutter heads 302 are separated by a certain distance; the static knife group 4 comprises a plurality of static knives 401, and the static knives 401 are also separated by a certain distance;

the movable knife 303 and the fixed knife 401 are arranged in a crossed manner on an axial vertical plane, the fixed knife group 4 and the movable knife roller 3 are arranged in parallel in the axial direction, the movable knife 303 and the fixed knife 401 are sequentially arranged at intervals one by one in the axial plane, the movable knife 303 and the fixed knife 401 enter a gap which is formed between the movable knife 303 and the fixed knife 401, and the side faces are closely adjacent and tangent in a scissor manner;

the movable cutter roller 3 is rotated, so that the movable cutter point 303E and the static cutter point 401D on the side edge of each movable cutter 303 adjacent to the static cutter 401 form continuous shearing motion, the entering straw is cut into pieces according to a preset length, and the cut straw is conveyed out by the discharge belt conveyor 6.

The moving knife roll 3 comprises: the device comprises a main shaft 301, a cutter disc 302, a movable cutter 303 and a pin shaft 304;

the movable knife 303 is a strip-shaped body with a convex rib on the back, the main body is a movable knife body 303D, the section of the movable knife body is T-shaped, the edges of the two longitudinal side surfaces of the front are provided with a movable knife tip 303E which protrudes outwards and is sharp, the front end is provided with a knife claw 303C which bends towards the front lower part, the middle of the back of the movable knife 303 is longitudinally provided with a movable knife convex rib 303A, the front part of the movable knife convex rib 303A is provided with a movable knife pin shaft hole 303B, and the height of the rear part of the movable knife convex rib 303A;

the cutter head 302 is a disk with a certain thickness, a plurality of notches are uniformly milled on the circular excircle of the cutter head body 302F, sawteeth 302B are formed at the rest positions, cutter head grooves 302A and cutter head pin shaft holes 302C are formed in the front faces of the sawteeth 302B, the cutter head grooves 302A enter the outer edge of the cutter head 302 towards the end of the circle center, positioning pits 302G for accommodating the movable cutter 303 are arranged on the outer edge of the cutter head 302, a cutter head inner hole 302D is formed in the center of the cutter head 302, and a protruding circular truncated cone 302E is arranged on the periphery of the cutter head inner hole 302D on one side of the cutter;

the inner end of the movable knife 303 is inserted into the positioning concave pit 302G of the cutter head 302 and is clamped, meanwhile, the movable knife convex rib 303A is inserted into the cutter head groove 302A and is fixed by a pin shaft 304 penetrating into a cutter head pin shaft hole 302C and a movable knife pin shaft hole 303B, and the movable knife 303 is fixedly connected to the sawtooth 302B at the front end of the cutter head 302; each sawtooth 302B of each cutter disc 302 is provided with a moving cutter 303, a plurality of cutter discs 302 penetrate through the main shaft 301 and are circumferentially fixed through keys, and the moving cutters 303 of adjacent cutter discs 302 are separated by round tables 302E at intervals to form a moving cutter roller 3.

Referring to fig. 5 to 6, 11 to 13, and 18 to 21: :

the stationary knife group 4 comprises: a static knife 401, a static knife rest 402, a rectangular beam 403 and a flange 404;

the static knife 401 is a rectangular plate body with convex ribs on the back, the main body is a static knife body 401C, the section is in a flat T shape, the edges of the two longitudinal side surfaces of the front are provided with outwards protruded and sharp static knife tips 401D, a plurality of through bolt holes 401A are arranged along the longitudinal central line, and the middle of the back of the static knife 401 is longitudinally provided with a static knife convex rib 401B;

the static knife rest 402 is a plate body with a certain thickness, a concave platform 402C is arranged on the top surface of the front half part, the height of the platform 402C is equal to the thickness of the static knife 401, a static knife rest groove 402A is longitudinally formed in the middle of the lower surface of the platform 402C, a plurality of countersunk bolt holes 402D with internal threads are formed downwards along the central line of the static knife rest groove 402A, and a rectangular hole 402B is formed in the rear half part of the static knife rest 402 and is vertical to the plate body; the rectangular beam 403 is a long beam with a rectangular outer section;

inserting the convex rib 401B of the static cutter into the groove 402A of the static cutter holder, threading a bolt through the bolt hole 401A and screwing the bolt into the countersunk head bolt hole 402D, and fixedly connecting the static cutter 401 to the static cutter holder 402; a plurality of static knife carriers 402 fixed with static knives 401 pass through respective rectangular holes 402B by rectangular beams 403 and are connected in series to form a static knife group 4, two ends of the rectangular beams 403 are fixed by flanges 404, and the rectangular beams 403 prevent the static knife carriers 402 from rotating in the circumferential direction to form the static knife group 4.

Referring to fig. 7 and 8:

the feeder 5 consists of; the motor, the driving shaft, the action wheel, the driven shaft, from the driving wheel, chain 501, scraper blade 502 constitutes, and the batcher chain rotates to moving the sword and rolling 3 directions, and the batcher scraper blade drives the material and moves the sword and roll 3 supplies to in succession.

The widths of the static knives 401 and the static knife rest 402 are equal to the height of the circular truncated cone 302E of the cutter head 302, the distance between every two static knives 401 is equal to the width of the moving knife 303 during assembly, and the static knives 401 can slightly slide on the static knife rest 402 along the longitudinal direction of the rectangular beam 403.

The height of the circular truncated cone 302E of the cutter deck 302 is equal to the width of the stationary knife 401.

The following illustrates a preferred embodiment of the present invention:

example one

The straw chopper technology is applied to a production line of a certain power plant, and the technical indexes and parameters are as follows:

1. cutting materials: various straw wrapping materials or bulk materials such as rice straws, wheat straws, corn stalks, reeds and the like can not enter hard objects such as ironware, stones and the like.

2. Cutting length: less than or equal to 10cm and reaches 95 percent.

3. The cutting amount is as follows: straw bulk materials or package materials such as straws, corn stalks and the like are 30-60 t/h.

4. The service life of the cutter is as follows: more than half a year.

5. Installed capacity: straw cutter type I232 KW. straw cutter type II 323KW, straw cutter type III 463 KW.

6. The external dimension of the straw cutter is as follows: the length is 13m, the width is 2.2m and the height is 3 m.

7. Specification of the discharging belt conveyor: the length is 9.5m, the width is 1.2m, the inclination angle is 0-45 degrees, and the head raising height is 4 m.

Claims

1. A straw chopper, comprising: main motor (1), big torque reducer (2), move the sword and roll (3), quiet knife tackle (4), batcher (5), ejection of compact belt feeder (6), hopper (7), its characterized in that: the feeding machine (5) supplies materials to the movable cutter roller (3), the main motor (1) is decelerated by the large-torque speed reducer (2) to drive the movable cutter roller (3) to rotate, and the movable cutter roller (3) and the static cutter group (4) are arranged in the hopper (7);

the movable cutter roller (3) comprises a plurality of cutter heads (302) with saw teeth on the circumference, a movable cutter (303) is arranged at each saw tooth end of each cutter head (302), the movable cutters (303) of adjacent cutter heads (302) are separated by a certain distance, the static cutter group (4) comprises a plurality of static cutters (401), and the static cutters (401) are also separated by a certain distance;

the movable knife (303) and the fixed knife (401) are arranged in a crossed manner on an axial vertical plane, the fixed knife group (4) and the movable knife roller (3) are arranged in parallel in the axial direction, the movable knife (303) and the fixed knife (401) are sequentially arranged at intervals one by one in an axial plane, the movable knife (303) and the fixed knife (401) enter a gap which is formed between the movable knife and the fixed knife, and the side faces are closely adjacent and tangent in a scissor manner;

the movable cutter roller (3) is rotated, so that the movable cutter point (303E) and the static cutter point (401D) on the side edge of each movable cutter (303) adjacent to the static cutter (401) form continuous shearing motion, the entering straw is cut into pieces according to a preset length, and the cut straw is conveyed out by a discharge belt conveyor (6).

2. The straw chopper of claim 1, wherein: the movable cutter roller (3) comprises: the device comprises a main shaft (301), a cutter head (302), a movable cutter (303) and a pin shaft (304);

the moving blade (303) includes: the cutter comprises a movable cutter convex rib (303A), a pin shaft hole (303B), a cutter claw (303C), a movable cutter body (303D) and a movable cutter point (303E);

the movable knife (303) is a strip-shaped body with a convex rib on the back, the main body is a movable knife body (303D), the section of the movable knife body is T-shaped, the edges of the two longitudinal side surfaces of the front are provided with a movable knife tip (303E) which protrudes outwards and is sharp, the front end of the movable knife is provided with a knife claw (303C) which bends towards the front lower part, the middle of the back of the movable knife (303) is longitudinally provided with a movable knife convex rib (303A), the front part of the movable knife convex rib (303A) is provided with a movable knife pin shaft hole (303B), and the height of the rear part of the;

the cutter head (302) comprises: a cutter head groove (302A), saw teeth (302B), a cutter head pin shaft hole (302C), a cutter head inner hole (302D), a circular truncated cone (302E), a cutter head body (302F) and a positioning pit (302G);

the cutter head (302) is a disk with a certain thickness, a plurality of notches are uniformly milled on the circular excircle of the cutter head body (302F), sawteeth (302B) are formed at the rest positions, cutter head grooves (302A) and cutter head pin shaft holes (302C) are formed in the front faces of the sawteeth (302B), the cutter head grooves (302A) enter the outer edge of the cutter head (302) towards the end of the circle center, positioning pits (302G) for accommodating the movable cutter (303) are formed in the outer edge of the cutter head (302), a cutter head inner hole (302D) is formed in the center of the cutter head (302), and a protruding circular truncated cone (302E) is arranged on the periphery of the cutter head inner hole (302D) on one side of the cutter head;

the inner end of the movable knife (303) is inserted into the positioning concave pit (302G) of the cutter head (302) and clamped, meanwhile, the movable knife convex rib (303A) is inserted into the cutter head groove (302A) and is fixed by a pin shaft (304) penetrating into a cutter head pin shaft hole (302C) and a movable knife pin shaft hole (303B), and the movable knife (303) is fixedly connected to the sawtooth (302B) at the front end of the cutter head (302); each sawtooth (302B) of each cutter head (302) is provided with a movable cutter (303), a plurality of cutter heads (302) penetrate through the main shaft (301) and are circumferentially fixed through keys, the movable cutters (303) of adjacent cutter heads (302) are separated by round platforms (302E) at intervals, and a movable cutter roller (3) is formed.

3. The straw chopper of claim 1, wherein: the static knife tackle (4) comprises: the device comprises a static knife (401), a static knife rest (402), a rectangular beam (403) and a flange (404);

the stationary knife (401) includes: the device comprises a bolt hole (401A), a static cutter convex rib (401B), a static cutter body (401C) and a static cutter point (401D);

the static knife (401) is a rectangular plate body with convex ribs on the back, the main body is a static knife body (401C), the section is in a flat T shape, the edges of the two longitudinal side surfaces of the front are provided with outwards protruded and sharp static knife tips (401D), a plurality of through bolt holes (401A) are arranged along the longitudinal central line, and the middle of the back of the static knife (401) is longitudinally provided with a static knife convex rib (401B);

the stationary blade holder (402) includes: a static tool rest groove (402A), a rectangular hole (402B), a platform (402C) and a countersunk bolt hole (402D);

the static knife rest (402) is a plate body with a certain thickness, a concave platform (402C) is arranged on the top surface of the front half part, the height of the platform (402C) is equal to the thickness of the static knife (401), a static knife rest groove (402A) is longitudinally formed in the middle of the lower surface of the platform (402C), a plurality of countersunk bolt holes (402D) with internal threads are formed downwards along the central line of the static knife rest groove (402A), and a rectangular hole (402B) is formed in the rear half part of the static knife rest (402) and is vertical to the plate body; the rectangular beam (403) is a long beam with a rectangular outer section;

inserting the convex rib (401B) of the static cutter into the groove (402A) of the static cutter holder, penetrating a bolt hole (401A) by a bolt and screwing the bolt into a countersunk head bolt hole (402D), and fixedly connecting the static cutter (401) to the static cutter holder (402); a plurality of static knife rests (402) fixed with static knives (401) are formed by a rectangular beam (403) penetrating through respective rectangular holes (402B) and connected in series to form a static knife group (4), two ends of the rectangular beam (403) are fixed by flanges (404), and the rectangular beam (403) prevents the static knife rests (402) from rotating in the circumferential direction to form the static knife group (4).

4. The straw chopper of claim 1, wherein: the feeding machine (5) consists of; the feeding machine comprises a motor, a driving shaft, a driving wheel, a driven shaft, a driven wheel, a chain (501) and a scraper (502), wherein the feeding machine chain rotates towards the direction of the movable cutter roller (3), and the feeding machine scraper drives materials to continuously feed to the movable cutter roller (3).

5. A straw chopper as defined in claims 2 and 3, further characterized by: the widths of the static cutters (401) and the static cutter holder (402) are equal to the height of the circular truncated cone (302E) of the cutter head (302), during assembly, the distance between the static cutters (401) is equal to the width of the movable cutter (303), and the static cutters (401) can slightly slide on the static cutter holder (402) along the longitudinal direction of the rectangular beam (403).

6. The straw chopper of claim 2, wherein: the height of the circular truncated cone (302E) of the cutter head (302) is equal to the width of the static cutter (401).