A grass chopper with a rotating knife guard

Abstract

The utility model relates to the field of grass chopper, concretely relates to a grass chopper with rotary tool rest anti -winding device, including protection and flail portion, the flail portion sets up in the protection inside, the flail portion and the protection junctions are provided with anti -winding portion, prevent the grass stem from winding in the flail portion and the protection junctions when chopping grass through anti -winding portion, the flail portion includes the main shaft, the anti -winding portion includes anti -winding cover, the main shaft rotates and sets up in the protection inside, through anti -winding cover closes its rotary connection protection place, the grass chopper with rotary tool rest anti -winding device of the utility model sets up anti -winding cover, and the dynamic airtight space formed by annular cover body and rotating closing cover plate, the contact of grass stem and main shaft end and bearing etc. Key position is isolated, thereby can effectively prevent the problem that bearing load increases, heating is serious and even jams and stops rotation because of grass stem winding, significantly improves the continuous operation ability and operation reliability of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of grass shredders, specifically relating to a grass shredder with a rotating blade holder anti-tangling device. Background Technology

[0002] As a common type of garden machinery and agricultural equipment, lawn choppers are widely used in lawn maintenance and field management. Their core function is to shred weeds or crop stalks using high-speed rotating blades, effectively suppressing weed growth, promoting soil fertility, and facilitating crop harvesting and post-harvest processing. The efficient operation of lawn choppers relies on their powerful power system and wear-resistant blade design, enabling stable operation in various complex terrains and vegetation conditions.

[0003] In existing technology, most multi-shaft grass shredders on the market use a star-shaped side plate structure in the rotating blade section, and the two ends of the main shaft are often exposed or semi-exposed. During actual operation, long grass stems easily become entangled at the connection between the rotating blade section and the protective cover, especially in the main shaft bearing area. Due to the complex structure and narrow space in this area, once the grass stems become entangled, they are difficult to remove on their own, leading to increased load on the bearing, severe overheating, and even complete jamming, causing the blade section to stop rotating. Operators must frequently stop the machine for cleaning, but the cleaning process is very difficult and time-consuming due to space constraints and the tightness of the entanglement, seriously affecting the continuous operation efficiency of the grass shredder and the user experience. Therefore, overcoming the above-mentioned technical problems and defects is a key issue that needs to be addressed. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects described in the background art, thereby realizing a grass shredder with a rotating blade holder anti-entanglement device, so as to solve the problems in the prior art such as grass stems entangled in the main shaft bearing position, difficulty in cleaning, serious bearing overheating, time-consuming downtime for cleaning, and impact on work efficiency.

[0005] To achieve the above-mentioned utility model objectives, the technical solution of this utility model is: a grass shredder with a rotating blade holder anti-tangling device, comprising a protective part and a blade-throwing part, wherein the blade-throwing part is disposed inside the protective part, and an anti-tangling part is provided at the connection between the blade-throwing part and the protective part, thereby preventing grass stems from tangling at the connection between the blade-throwing part and the protective part during grass shredding.

[0006] Specifically, the slinger includes a main shaft, and the anti-winding part includes an anti-winding cover. The main shaft is rotatably disposed inside the protective part, and its rotatable connection to the protective part is sealed by the anti-winding cover.

[0007] In the aforementioned grass shredder with a rotating blade holder anti-tangling device, the anti-tangling cover includes an annular cover body and a closed cover plate. The annular cover body is symmetrically arranged on the inner wall of the protective part, and the closed cover plate is arranged at both ends of the main shaft. The main shaft is rotated and fixedly arranged inside the protective part through a bearing bracket.

[0008] Specifically, when the main shaft is rotated inside the protective part, the main shaft and the annular cover are coaxially arranged, and the closed cover plates at both ends of the main shaft are fitted into the annular cover.

[0009] In the aforementioned grass shredder with a rotating blade holder anti-tangling device, the protective part includes a protective cover body and a suspension frame, which is integrally or separately disposed on the front side of the protective cover body.

[0010] The main body of the protective cover is a semi-open cover that is closed on both sides, top and front, and open on bottom and rear. The slinger is located inside the main body of the protective cover.

[0011] At the connection between the main body of the protective cover and the main shaft, a main bearing mounting groove for installing the main shaft is provided. Both ends of the main shaft are set in the main bearing mounting groove of the protective cover through bearing brackets.

[0012] In the aforementioned grass shredder with a rotating blade holder anti-tangling device, the blade-slinging section further includes planetary shafts and blades. Multiple planetary shafts are arranged in a circumferential array around the main shaft. The blades are arranged in groups of three on the planetary shafts. Each planetary shaft has multiple sets of blades, and the blades on each planetary shaft are staggered from the blades on other planetary shafts.

[0013] The two ends of the planetary shaft are fixedly connected to and pass through the closed cover plate, which is concentrically fixed at both ends of the main shaft.

[0014] Preferably, a cleaning unit is also provided at the main bearing mounting slot. The cleaning unit is located on the outer side wall of the protective cover body at the lower part of the bearing bracket that fixes the main shaft, and a limit plate is provided at the main bearing mounting slot at the lower part of the cleaning unit.

[0015] Specifically, the cleaning unit includes a movable cover with a viewing window. The specifications of the movable cover are adapted to the specifications of the main bearing mounting groove. The movable cover has raised edges on its left, right, and lower edges. The raised edges on the left and right sides of the movable cover abut against the left and right edges of the main bearing mounting groove, respectively. The raised edge at the bottom of the movable cover abuts against the outer wall of the limiting plate.

[0016] Preferably, one side of the movable cover is connected to the outer wall of the protective cover body on the side of the main bearing mounting groove via a hinge, and the other side is connected to the outer wall of the main body via a buckle.

[0017] Preferably, both sides of the movable cover are connected to the outer wall of the protective cover body on the side of the main bearing mounting groove by buckles and / or hand-tightened bolts and / or fasteners.

[0018] Preferably, an arc-shaped scraper is provided on the bottom inner side of the movable cover. The arc-shaped scraper is vertically fixed to the side of the closed cover plate inside the annular cover by bolts. The bottom of the arc-shaped scraper is fitted to the inner wall of the annular cover and is adapted to the curvature of the inner wall of the annular cover.

[0019] Preferably, an anti-winding platform is provided at the fixed connection point of the main shaft on the inner side of the closed cover plate. The anti-winding platform is frustum-shaped and has a smooth surface.

[0020] The beneficial effects of this utility model are:

[0021] 1. The grass shredder with a rotating blade holder anti-winding device of this utility model, by setting an anti-winding cover, the dynamic sealed space formed by the annular cover and the rotating closed cover plate isolates the grass stems from contact with the end of the main shaft and bearings and other key parts, thereby effectively preventing the problem of increased bearing load, severe heat generation and even jamming and stoppage caused by grass stem entanglement, and significantly improving the continuous operation capability and operational reliability of the equipment.

[0022] 2. The cleaning unit equipped in this utility model automatically scrapes off the attached materials on the inner wall of the annular cover by rotating the arc-shaped scraper with the main shaft, preventing the accumulation of debris from affecting normal operation. In addition, the movable cover with a viewing window, combined with multiple quick connection methods, allows maintenance personnel to easily open the cover for observation and cleaning without tools, greatly simplifying the maintenance process, reducing downtime, and thus improving the problems of poor equipment maintainability and difficult cleaning.

[0023] 3. The streamlined anti-winding platform and its smooth surface at the closed cover of this utility model, combined with the closed structure, form a double protection structure. During use, it can effectively guide occasionally approaching grass stems, minimize the possibility of potential entanglement, further ensure the operation of the main shaft, and enable the equipment to maintain stable high-performance output during long-term continuous operation, significantly improving work efficiency and user satisfaction. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a grass shredder with a rotating blade holder anti-tangling device according to the present invention;

[0025] Figure 2 This is a three-dimensional schematic diagram of the internal structure of the grass shredder with a rotating blade holder anti-tangling device according to this utility model;

[0026] Figure 3 This is a schematic diagram of the internal structure of the grass shredder with a rotating blade holder anti-tangling device after removing the top of the protective cover;

[0027] Figure 4 This is a schematic diagram of the internal structure of the annular cover after the removal of the blades and the sealing of the cover plate of the grass shredder with a rotating blade holder anti-entanglement device according to this utility model.

[0028] In the picture:

[0029] 1-Protection Department:

[0030] 101 - Protective cover body, 102 - Suspension bracket, 103 - Main bearing mounting groove;

[0031] 2-Swing blade section:

[0032] 201-Spindle, 202-Bearing bracket, 203-Planetary axis, 204-Scraper;

[0033] 3-Anti-twist section:

[0034] 301-Anti-winding cover, 311-Annular cover body, 312-Closed cover plate, 313-Anti-winding platform;

[0035] 4-Cleanup Unit:

[0036] 401-Limiting plate, 402-Modible cover, 403-Viewing window, 404-Raised edge, 405-Hinge, 406-Snap fastener, 407-Arc-shaped scraper. Detailed Implementation

[0037] The following description, in conjunction with the accompanying drawings and specific embodiments, provides a more detailed account of the grass shredder with a rotating blade holder anti-tangling device of this utility model.

[0038] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Example 1

[0040] This embodiment discloses a grass shredder with a rotating blade holder anti-entanglement device. By setting the anti-entanglement part, it solves the problems in the prior art such as grass stems getting entangled in the main shaft bearing position, which are difficult to clean, the bearing overheats, and the time spent on cleaning during downtime, which affects the work efficiency.

[0041] To achieve the above objectives, Figure 1 , Figure 2 , Figure 3It mainly includes a protective part 1 and a blade-throwing part 2. The blade-throwing part 2 is disposed inside the protective part 1. The blade-throwing part 2 is characterized by an anti-winding part 3 at the connection between the blade-throwing part 2 and the protective part 1. The anti-winding part 3 prevents the grass stems from getting tangled at the connection between the blade-throwing part 2 and the protective part 1 when the grass is being chopped. The blade-throwing part 2 includes a main shaft 201, and the anti-winding part 3 includes an anti-winding cover 301. While the main shaft 201 is rotatably disposed inside the protective part 1, the anti-winding cover 301 closes the rotatable connection between the main shaft 201 and the protective part 1.

[0042] In this embodiment, while the main shaft 201 is rotatably mounted inside the protective part 1, an anti-tangling cover 301 is used to seal the rotatable connection between it and the protective part 1. The anti-tangling cover 301 forms a physical barrier, preventing the grass stems that are splashed during the grass shredding operation from contacting the end of the main shaft 201 and critical rotatable connection parts such as bearings. This prevents the grass stems from tangling and accumulating at the source, avoiding problems such as bearing overheating, increased load, and even shutdown for cleaning, thus significantly improving the operational reliability and continuous operation efficiency of the equipment.

[0043] See Figure 2 , Figure 3 , Figure 4 The anti-winding cover 301 includes an annular cover 311 and a sealing cover 312. The annular cover 311 is symmetrically arranged on the inner wall of the protective part 1, and the sealing cover 312 is disposed at both ends of the main shaft 201. The main shaft 201 is rotatably and fixedly disposed inside the protective part 1 through the bearing bracket 202. When the main shaft 201 is rotatably disposed inside the protective part 1, the main shaft 201 and the annular cover 311 are coaxially arranged, and the sealing cover 312 at both ends of the main shaft 201 is fitted into the annular cover 311.

[0044] In this embodiment, the anti-winding cover 301 includes an annular cover 311 and a closed cover plate 312. The annular cover 311 is symmetrically fixed to the inner wall of the protective part 1, and the closed cover plate 312 is installed at both ends of the main shaft 201. The main shaft 201 itself rotates and is fixed inside the protective part 1 through the bearing bracket 202. When the main shaft 201 is installed in place, it is coaxial with the annular cover 311, and the closed cover plates 312 at both ends are precisely embedded and fit into the internal space of the annular cover 311.

[0045] Through the above structure, the annular cover 311 and the rotating closed cover 312 form a dynamic, sealed enclosed space, completely enclosing the bearing areas at both ends of the main shaft 201. This physically isolates the entry path of external grass stems, effectively preventing grass stems from tangling and accumulating in key rotating parts during grass shredding operations. This ensures the smooth operation of the main shaft 201, avoids problems such as increased load and overheating shutdowns caused by grass tangling, and significantly improves the reliability and working efficiency of the equipment.

[0046] See Figure 1 , Figure 3 The protective part 1 includes a protective cover body 101 and a suspension bracket 102, wherein the suspension bracket 102 is integrally or separately disposed on the front side of the protective cover body 101. See also Figure 1 The protective cover body 101 is a semi-open cover with closed sides, top and front, and open bottom and rear. The slinger 2 is located inside the protective cover body 101. At the connection between the protective cover body 101 and the main shaft 201, a main bearing mounting groove 103 for mounting the main shaft 201 is provided. Both ends of the main shaft 201 are mounted in the main bearing mounting groove 103 of the protective cover via bearing brackets 202.

[0047] In this embodiment, the protective cover body 101 adopts a semi-open structure with closed sides, top and front, and open bottom and rear, providing working space for the internal blade throwing section 2, while preventing debris and foreign objects generated during the blade throwing section's operation from splashing into the surrounding environment, thus ensuring operational safety.

[0048] Meanwhile, the main bearing mounting groove 103 is specially opened at the connection between the protective cover body 101 and the main shaft 201. Both ends of the main shaft 201 are precisely installed and fixed in the main bearing mounting groove 103 through the bearing bracket 202. The cooperation between the specially designed main bearing mounting groove 103 and the bearing bracket 202 provides stable and reliable support for the main shaft 201, ensuring the concentricity of the rotating parts and the smoothness of operation, thereby improving the overall protective performance, structural rigidity and operational reliability of the equipment.

[0049] See Figure 2 , Figure 3 The blade-spinning section 2 further includes planetary shafts 203 and blades 204. Multiple planetary shafts 203 are arranged in a circumferential array around the main shaft 201. The blades 204 are arranged in groups of three on the planetary shafts 203. Each planetary shaft 203 has multiple sets of blades 204, and the blades 204 on each planetary shaft 203 are staggered from those on other planetary shafts 203. The two ends of the planetary shafts 203 are fixedly connected to and pass through a sealing cover plate 312, which is concentrically fixed at both ends of the main shaft 201.

[0050] In this embodiment, when the main shaft 201 rotates, the planetary shaft 203, which passes through and is fixed to the two side closed cover plates 312, drives all the staggered blades 204 to move and perform grass chopping.

[0051] The planetary shaft 203 is supported and fixed at both ends by a closed cover plate 312. In this embodiment, the closed cover plate 312 is a circular plate. The planetary shaft 203 is connected to the main shaft 201 through the closed cover plate 312, which can prevent the shaft end of the planetary shaft 203 from being exposed and can effectively prevent grass stems from getting tangled at the shaft end of the planetary shaft 203.

[0052] Example 2

[0053] The similarities to the above embodiments will not be repeated, the differences are as follows:

[0054] See Figure 2 , Figure 3 A cleaning unit 4 is also provided at the main bearing mounting groove 103. The cleaning unit 4 is located on the outer wall of the protective cover body 101 at the lower part of the bearing bracket 202 that fixes the main shaft 201. A limit plate 401 is provided at the main bearing mounting groove 103 at the lower part of the cleaning unit 4.

[0055] The cleaning unit 4 includes a movable cover 402, on which a viewing window 403 is provided. The specifications of the movable cover 402 are adapted to the specifications of the main bearing mounting groove 103. The movable cover 402 has protruding edges 404 on its left, right and lower edges. The protruding edges 404 on the left and right sides of the movable cover 402 abut against the left and right edges of the main bearing mounting groove 103, respectively. The protruding edge 404 at the bottom of the movable cover 402 abuts against the outer wall of the limiting plate 401.

[0056] In this embodiment, since the annular cover 311 is fixedly installed on the inner wall of the protective cover body 101, and the sealing cover plate is fixedly installed on the main shaft 201, the annular cover 311 and the sealing cover plate 312 are in a clearance fit. When the blade section 2 is working, dust inevitably enters the interior of the annular cover 311 through the clearance fit. The movable cover 402 with a protruding edge 404 cooperates with the main bearing mounting groove 103 and the limiting plate 401 to form a window for inspection and operation inside the annular cover 311 that can be quickly opened and closed and is well sealed. Through the movable cover 402, the operator can directly observe the internal condition of the annular cover 311 through the viewing window 403, realizing quick inspection without removing the cover; in addition, when maintenance and cleaning are required, the movable cover 402 can be easily opened to clean or maintain the interior of the annular cover 311. The contact between the protruding edge 404 and the limiting plate 401 ensures the stability of the movable cover 402 under equipment vibration.

[0057] Example 3

[0058] The similarities with the above embodiments and their combinations will not be repeated, the differences being:

[0059] See Figure 2The movable cover 402 is connected on one side to the outer wall of the protective cover body 101 on the side of the main bearing mounting groove 103 via a hinge 405, and on the other side to the outer wall of the main body via a buckle 406.

[0060] In this embodiment, the hinge 405 structure allows the movable cover 402 to be flipped, while the latch 406 serves as a quick-locking and releasing mechanism, enabling repeated opening and closing of the other side of the movable cover 402. Through this structure, the latch 406 allows for quick unlocking and opening of the movable cover 402 with one hand during routine inspections without any tools, greatly improving the convenience of equipment maintenance. Simultaneously, after latching, it ensures that the movable cover 402 is securely locked even under high-speed vibration conditions, effectively preventing accidental opening.

[0061] Example 4

[0062] The similarities with the above embodiments and their combinations will not be repeated, the differences being:

[0063] In this embodiment, both sides of the movable cover 402 are connected to the outer wall of the protective cover body 101 on one side of the main bearing mounting groove 103 by buckles and / or hand-tightened bolts and / or fasteners 406.

[0064] In this embodiment, a snap-fit ​​mechanism enables quick, tool-free assembly and disassembly, while a hand-tightened bolt provides a secure and reliable threaded lock. The latch 406 balances ease of operation with a stable connection. This structure allows for the rapid removal of the movable cover 402, enabling maintenance personnel to select the appropriate connection method for installation based on different maintenance frequencies or operating environments. Simultaneously, this connection method ensures convenient maintenance while effectively maintaining the movable cover 402 in a tightly closed state even under severe machine vibration, preventing accidental opening and guaranteeing the equipment's safety and reliability.

[0065] Example 5

[0066] The similarities with the above embodiments and their combinations will not be repeated, the differences being:

[0067] See Figure 1 , Figure 4 An arc-shaped scraper 407 is provided on the bottom inner side of the movable cover 402. The arc-shaped scraper 407 is vertically fixed to the side of the closed cover plate 312 inside the annular cover 311 by bolts. The bottom of the arc-shaped scraper 407 is attached to the inner wall of the annular cover 311 and is adapted to the curvature of the inner wall of the annular cover 311.

[0068] In this embodiment, through the above structure, the closed cover plate 312 rotates to drive the arc-shaped scraper 407, causing it to perform relative scraping motion on the inner wall of the annular cover 311.

[0069] During operation, the arc-shaped scraper 407 continuously and automatically scrapes away any grass clippings, dirt, and other debris that may splash and adhere to the inner wall of the annular cover 311. This prevents the accumulation of these debris inside the sealed anti-tangling cover, thus avoiding problems such as impaired rotation, loss of dynamic balance, or even blockage caused by debris buildup. This effectively ensures the long-term effectiveness and internal cleanliness of the anti-tangling section 3. Simultaneously, in conjunction with the movable cover 402, dust and debris inside the annular cover 311 can be quickly cleaned, further ensuring smooth operation of the equipment and a clean internal environment.

[0070] Example 6

[0071] The similarities with the above embodiments and their combinations will not be repeated, the differences being:

[0072] See Figure 3 An anti-winding platform 313 is provided on the inner side of the closed cover plate 312 where the main shaft 201 is fixedly connected. The anti-winding platform 313 is frustum-shaped and has a smooth surface.

[0073] In this embodiment, the above-described structure, utilizing geometric shapes and low-friction surfaces, provides a smooth transition and a surface that is difficult for grass stems to adhere to at the connection between the main shaft 201 and the closed cover plate 312. The frustum-shaped streamlined structure effectively guides and slides away any grass stems that may come into contact, preventing them from getting caught at the connection between the main shaft 201 and the closed cover plate 312. In addition, its smooth surface treatment greatly reduces the friction between weed fibers and the metal surface, making it difficult for even a small amount of grass fibers to entangle and get stuck. This forms a second effective protective structure at the connection between the closed cover plate 312 and the main shaft 201, minimizing the possibility of grass stem entanglement and ensuring the smooth operation of the main shaft 201.

[0074] The working principle of this utility model of a straw shredder with a rotating blade holder anti-tangling device is as follows:

[0075] When this utility model is in use, the main shaft 201 rotates, which drives the planetary shaft 203 of the closed cover plate 312 to rotate synchronously. The annular cover 311 fixed to the inner side wall of the protective cover body 101 cooperates with the rotating closed cover plate 312 to form a dynamic sealed space, which completely wraps the bearing areas at both ends of the main shaft 201, thereby isolating the entry path of the grass stems, preventing the main shaft from getting tangled and causing the bearings to jam.

[0076] Meanwhile, the arc-shaped scraper 407 fixed on the closed cover plate 312 rotates with it, continuously scraping the inner wall of the annular cover 311, automatically removing grass clippings or dust that enter the interior of the annular cover 311 from the gap between the annular cover 311 and the closed cover plate 312, keeping the interior clean.

[0077] In addition, the anti-tangling platform 313, located at the connection between the main shaft 201 and the closed cover plate 312, uses its smooth frustum-shaped surface to guide and slide away any grass stems that may occasionally approach, forming a second anti-tangling barrier. Operators can observe the internal condition through the viewing window 403 on the movable cover 402 of the cleaning unit 4. When maintenance is required, the movable cover 402 can be quickly opened to clean the inside of the annular cover 311. The cooperation between the protruding edge 404 and the limiting plate 401 ensures the stability of the movable cover during operation, thereby achieving integrated and efficient operation of grass shredding, anti-tangling, self-cleaning, and convenient maintenance.

[0078] It should be noted that, in actual implementation, the structure depicted in the accompanying drawings is not a fixed or unchanging embodiment. The components of the embodiments of this invention described and shown in these drawings can typically be arranged and designed in various different configurations. Furthermore, the accompanying drawings and abstract drawings are merely illustrative and do not represent the specific structure or actual quantity in a concrete implementation.

[0079] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or component preceding the word encompasses the element or component listed following the word and its equivalents, without excluding other elements or components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0080] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A grass shredder with a rotating blade holder anti-tangling device, comprising a protective section (1) and a blade-throwing section (2), wherein the blade-throwing section (2) is disposed inside the protective section (1), characterized in that: An anti-winding part (3) is provided at the connection between the blade part (2) and the protective part (1). The anti-winding part (3) prevents the grass stems from getting tangled at the connection between the blade part (2) and the protective part (1) when the grass is being chopped. The slinger (2) includes a spindle (201), and the anti-winding part (3) includes an anti-winding cover (301). The spindle (201) is rotatably disposed inside the protective part (1), and its rotatable connection to the protective part (1) is sealed by the anti-winding cover (301).

2. The straw shredder with a rotating blade holder anti-tangling device according to claim 1, characterized in that: The anti-winding cover (301) includes an annular cover (311) and a closed cover plate (312). The annular cover (311) is symmetrically arranged on the inner side wall of the protective part (1). The closed cover plate (312) is arranged at both ends of the main shaft (201). The main shaft (201) is rotated and fixedly arranged inside the protective part (1) through the bearing bracket (202). When the main shaft (201) is rotated inside the protective part (1), the main shaft (201) and the annular cover (311) are coaxially arranged, and the closed cover plates (312) at both ends of the main shaft (201) are fitted into the annular cover (311).

3. The straw shredder with a rotating blade holder anti-tangling device according to claim 2, characterized in that: The protective part (1) includes a protective cover body (101) and a suspension frame (102), wherein the suspension frame (102) is integrally or separately disposed on the front side of the protective cover body (101); The protective cover body (101) is a semi-open cover with closed sides, top and front sides and open bottom and rear sides. The slinger (2) is located inside the protective cover body (101). At the connection between the main body (101) of the protective cover and the main shaft (201), a main bearing mounting groove (103) for mounting the main shaft (201) is provided. Both ends of the main shaft (201) are set at the main bearing mounting groove (103) of the protective cover through bearing brackets (202).

4. The straw shredder with a rotating blade holder anti-tangling device according to claim 2 or 3, characterized in that: The slinger section (2) further includes planetary shafts (203) and slingers (204). Multiple planetary shafts (203) are arranged in a circular array around the main shaft (201). The slingers (204) are arranged in groups of three on the planetary shafts (203). Each planetary shaft (203) is provided with multiple groups of slingers (204). The slingers (204) on each planetary shaft (203) are arranged in staggered positions with the slingers (204) on other planetary shafts (203). The two ends of the planetary shaft (203) are fixedly connected to and pass through the closed cover plate (312), which is concentrically fixed at both ends of the main shaft (201).

5. The straw shredder with a rotating blade holder anti-tangling device according to claim 3, characterized in that: A cleaning unit (4) is also provided at the main bearing mounting groove (103). The cleaning unit (4) is located on the outer wall of the protective cover body (101) at the lower part of the bearing bracket (202) that fixes the main shaft (201). A limit plate (401) is provided at the main bearing mounting groove (103) at the lower part of the cleaning unit (4). The cleaning unit (4) includes a movable cover (402) with a viewing window (403). The specifications of the movable cover (402) are adapted to the specifications of the main bearing mounting groove (103). The movable cover (402) has protruding edges (404) on its left, right and lower edges. The protruding edges (404) on the left and right sides of the movable cover (402) abut against the left and right edges of the main bearing mounting groove (103) respectively. The protruding edge (404) at the bottom of the movable cover (402) abuts against the outer wall of the limiting plate (401).

6. The straw shredder with a rotating blade holder anti-tangling device according to claim 5, characterized in that: The movable cover (402) is connected on one side to the outer wall of the protective cover body (101) on the side of the main bearing mounting groove (103) via a hinge (405), and on the other side to the outer wall of the main body via a buckle (406).

7. The straw shredder with a rotating blade holder anti-tangling device according to claim 5, characterized in that: Both sides of the movable cover (402) are connected to the outer wall of the protective cover body (101) on one side of the main bearing mounting groove (103) by buckles and / or hand-tightened bolts and / or fasteners (406).

8. The straw shredder with a rotating blade holder anti-tangling device according to claim 6 or 7, characterized in that: An arc-shaped scraper (407) is provided on the bottom inner side of the movable cover (402). The arc-shaped scraper (407) is vertically fixed to the side of the closed cover plate (312) inside the annular cover (311) by bolts. The bottom of the arc-shaped scraper (407) is attached to the inner wall of the annular cover (311) and is adapted to the curvature of the inner wall of the annular cover (311).

9. The straw shredder with a rotating blade holder anti-tangling device according to claim 2, characterized in that: An anti-winding platform (313) is provided at the inner side of the closed cover plate (312) where it is fixedly connected to the main shaft (201). The anti-winding platform (313) is frustum-shaped and has a smooth surface.

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