Double-layer earthwork excavating bucket

Abstract

The invention discloses a double-layer earthwork excavating bucket, and relates to the technical field of excavating buckets. The excavator comprises an inner excavator bucket, an outer excavator bucket is hinged to the inner excavator bucket, and the outer excavator bucket wraps the outer portion of the inner excavator bucket; an inserting rod is installed on the bucket teeth, an inserting groove used for containing the inserting rod is formed in the inner bucket body, a groove is formed in the bucket teeth, and a limiting plate used for being inserted into the groove is installed on the outer bucket body in a sliding mode. The bucket teeth are inserted into the limiting holes through the limiting rods, the outer bucket is rotated to wrap and shield the inner bucket, the durability of the inner bucket is improved, meanwhile, the limiting plates are driven to be aligned with the grooves, and after the limiting plates are inserted into the grooves, the limiting rods are inserted into the limiting holes through the through holes, so that the bucket teeth and the inner bucket are installed, and the bucket teeth and the inner bucket are installed conveniently. And after the bucket teeth are used for a long time and one bucket tooth is broken, the limiting rod is pulled out, the limiting plate slides to be disconnected with the groove, then the bucket teeth are detached and replaced, and the convenience of replacing the bucket teeth is improved.

Description

Technical Field

[0001] This invention relates to the field of excavator bucket technology, and specifically to a double-layer earthmoving excavator bucket. Background Technology

[0002] The excavator bucket is the working part of the excavator, which uses the bucket to excavate the soil and rocks that need to be dug.

[0003] Existing excavator buckets are composed of components such as tooth base plates, bottom plates, side plates, wall plates, hanging ear plates, back plates, bucket ear plates, bucket ear sleeves, bucket teeth, tooth bases, guard plates, or bucket corners. During excavation, the bucket teeth are inserted into the soil to dig, resulting in significant wear on the bucket teeth during use. If used for too long, they are prone to breaking when digging into harder materials in the soil. Since the bucket teeth are mostly installed on the tooth base by welding, replacing the bucket teeth requires grinding and re-welding the broken parts, making the replacement of bucket teeth quite troublesome.

[0004] Therefore, this invention proposes a double-layer earthmoving excavation bucket to improve this problem. Summary of the Invention

[0005] The purpose of this invention is to provide a double-layer earthmoving excavation bucket in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: A double-layer earthmoving excavator bucket includes: An inner bucket, to which an outer bucket is hinged, the outer bucket enclosing the outside of the inner bucket; Bucket teeth, on which insertion rods are installed, the inner bucket has a slot for accommodating the insertion rods, the bucket teeth have grooves, and the outer bucket has a limiting plate for being inserted into the grooves. The limiting component includes a limiting hole on the inner bucket and a limiting rod for insertion into the limiting hole. The limiting plate has a through hole for the limiting rod to pass through. When the limiting rod is inserted into the limiting hole, the rotation of the outer bucket is restricted, and the sliding of the limiting plate is restricted.

[0007] Furthermore, the bucket teeth include tooth plates and extension plates welded together, an insertion rod is installed on the tooth plate, a crossbar is installed on the tooth plate, a transverse hole for accommodating the crossbar is opened on the extension plate, a limiting groove is opened along the axial direction on the limiting rod, an annular groove communicating with the limiting groove is opened along the radial direction on the limiting rod, a connecting spring is installed in the limiting hole, and a rotation limiting block for insertion into the limiting groove is installed on the free end of the connecting spring.

[0008] Furthermore, the inner bucket is provided with a through slot, which allows the slot to communicate with the outside. When the bucket teeth are installed on the inner bucket, the extension plate is used to cover the through slot.

[0009] Furthermore, the inner bucket has an installation cavity, a sliding plate is slidably installed in the installation cavity, a push rod for insertion into a slot is installed on the sliding plate, an abutment rod is rotatably installed in the installation cavity, one end of the abutment rod contacts the sliding plate, and a steel chain is installed on the other end, and an opening communicating with the outside is opened on the side wall of the installation cavity, through which the steel chain passes to connect with the outer bucket.

[0010] Furthermore, the inner bucket has an embedded groove, an arc-shaped spring plate is installed in the embedded groove, and the extension plate has an inner recessed groove. When the arc-shaped spring plate is inserted into the inner recessed groove, the sliding of the extension plate is restricted.

[0011] Furthermore, an abutment spring is installed inside the mounting cavity, and the free end of the abutment spring is connected to the sliding plate.

[0012] Furthermore, the limiting plate has an insertion hole, and a cover is movably inserted into the limiting plate to block the through hole. The cover is equipped with a hook plate for insertion into the insertion hole.

[0013] Furthermore, a side baffle is installed on the side wall of the extension plate, which is used to cover the inner groove. The side baffle and the limiting plate are provided with inclined surfaces in the direction towards the toothed plate.

[0014] Furthermore, a guide rod is installed on the limiting plate, and a guide hole for accommodating the guide rod is provided on the outer bucket.

[0015] Furthermore, the outer bucket is equipped with multiple reinforcing ribs, and when the extension plate is installed on the inner bucket, its end contacts the end of the reinforcing rib.

[0016] The beneficial effects of this invention are as follows: This invention inserts the bucket teeth into the limiting hole via a limiting rod, and rotates the outer bucket to cover and shield the inner bucket, increasing the durability of the inner bucket while also aligning the limiting plate with the groove. After inserting the limiting plate into the groove, the limiting rod is inserted into the limiting hole through the through hole, thus completing the installation of the bucket teeth and the inner bucket. Furthermore, if one of the bucket teeth breaks after prolonged use, the limiting rod can be removed and the limiting plate slid to disengage from the groove, allowing the bucket tooth to be disassembled and replaced, thus increasing the convenience of bucket tooth replacement. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the structure on the outer bucket of the present invention; Figure 3 This is another schematic diagram of the three-dimensional structure of the present invention; Figure 4 This is a schematic diagram of the limiting rod structure of the present invention; Figure 5 This is a schematic diagram of the internal bucket structure of the present invention; Figure 6 This is an exploded view of part of the structure of this invention; Figure 7 This is an exploded view of the external bucket structure of the present invention; Figure 8 This is an exploded view of the bucket tooth structure of the present invention; Figure 9 This is a schematic diagram of the bucket teeth and their structure according to the present invention; Figure 10 This is an exploded view of the structure on the limiting plate of the present invention; Figure 11 This is the present invention. Figure 1 Three-dimensional sectional view of the structure; Figure 12 This is the present invention. Figure 1 Another three-dimensional sectional view of the structure; Figure 13 This is the present invention. Figure 9 Three-dimensional sectional view of the structure.

[0018] Reference numerals: 1. Inner bucket; 2. Outer bucket; 3. Bucket teeth; 301. Insertion rod; 302. Slot; 303. Groove; 304. Limiting plate; 305. Tooth plate; 306. Extension plate; 4. Limiting component; 401. Limiting hole; 402. Limiting rod; 403. Through hole; 404. Limiting groove; 405. Annular groove; 406. Connecting spring; 407. Rotation limit block; 5. Crossbar; 6. Cross hole; 7. Through groove; 8. Mounting cavity; 801. Sliding plate; 802. Push rod; 803. Abutment rod; 804. Steel chain; 805. Opening; 9. Embedded groove; 10. Arc-shaped spring plate; 11. Recessed groove; 12. Abutment spring; 13. Insertion hole; 14. Cover; 15. Hook plate; 16. Side baffle; 17. Guide rod; 18. Guide hole; 19. Reinforcing rib. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] like Figure 1 - Figure 13 As shown, an embodiment of the present invention provides a double-layer earthmoving excavation bucket, comprising: An inner bucket 1 is hinged to an outer bucket 2, which encloses the inner bucket 1. The inner bucket 1 is shaped like... Figure 1 As shown, the outer bucket 2 is used to shield three of the four outer walls of the inner bucket 1, so as to... Figure 1 From the main viewpoint, the inner bucket 1 is located on one side at the bottom without being obstructed. When the device is in use, this side first comes into contact with the soil and rocks. The outer bucket 2 thickens the overall wall thickness of the inner bucket 1, thereby increasing the durability of the device. The bucket teeth 3 are equipped with insertion rods 301. The inner bucket 1 has slots 302 for accommodating the insertion rods 301. The bucket teeth 3 have grooves 303. A limiting plate 304 is slidably installed on the outer bucket 2 for insertion into the grooves 303. The bucket teeth 3 function similarly to the teeth of existing digging buckets, used for breaking up soil and rocks. In use, the end of the inner bucket 1 where the bucket teeth 3 are installed is designated as the digging end. When installing the bucket teeth 3, the insertion rod 301 is aligned with the slot 302 and inserted into the slot 302, thus initially connecting the bucket teeth 3 to the inner bucket 1. The opening direction of the groove 303 is perpendicular to the opening direction of the slot 302. During installation, the limiting plate 304 is first slidably installed. When the plate 304 is moved away from the outer bucket 2 and the outer bucket 2 is rotated to wrap around and block the inner bucket 1, the limiting plate 304 is aligned with the groove 303. Then, the limiting plate 304 is slid to insert into the groove 303. The limiting plate 304 blocks the inner wall of the groove 303, thereby limiting the sliding of the bucket teeth 3 on the inner bucket 1, so that the bucket teeth 3 can be initially installed on the inner bucket 1. The limiting plate 304 and the outer bucket 2 are in a sliding relationship, while the outer bucket 2 and the inner bucket 1 are in a hinged relationship. Therefore, when the limiting plate 304 is inserted into the groove 303, the inner wall of the groove 303 blocks the side wall of the limiting plate 304, which also limits the rotation of the outer bucket 2, increasing the stability of the device during use. The limiting component 4 has a limiting hole 401 on the inner bucket 1, located on the side of the inner bucket 1 not obstructed by the outer bucket 2. The limiting component 4 includes a limiting rod 402 for insertion into the limiting hole 401. A through hole 403 is provided on the limiting plate 304 for the limiting rod 402 to pass through. When the limiting rod 402 is inserted into the limiting hole 401, the rotation of the outer bucket 2 is restricted, and the sliding of the limiting plate 304 is also restricted. Figure 1From the main perspective, after the outer bucket 2 encloses the inner bucket 1, the projection of the limiting plate 304 on the inner bucket 1 is located on the side of the inner bucket 1 not enclosed by the outer bucket 2. At this time, the through hole 403 is aligned with the limiting hole 401. The through hole 403 has two channels. The diameter of the channel closer to the outside is larger than the diameter of the channel closer to the limiting hole 401. The larger diameter end is designated as the expansion port, and the remaining part is designated as the insertion port. The limiting rod 402 also has two parts. When it is inserted into the through hole 403, the diameter of the end closer to the outside is larger than the diameter of the part inserted into the limiting hole 401. The larger diameter end is designated as the expansion end, and the remaining part is designated as the insertion end. When connecting, the limiting rod 402 is passed through the through hole 403 and inserted into the limiting hole 401. The limiting rod 402 is tightly inserted into the limiting hole 401. When the limiting rod 402 is inserted into the limiting hole 401, it works with the limiting plate 304 to restrict the sliding of the bucket tooth 3. The insertion end is inserted into the insertion port, and the expansion end of the limiting rod 402 blocks the inner wall of the expansion port of the limiting hole 401, thereby restricting the sliding of the limiting plate 304 and increasing the stability of the bucket tooth 3 during use. Compared with the existing technology, by inserting the bucket teeth 3 into the limiting hole 401 through the limiting rod 402 and rotating the outer bucket 2 to wrap and cover the inner bucket 1, the durability of the inner bucket 1 is increased. At the same time, it also drives the limiting plate 304 to align with the groove 303. After the limiting plate 304 is inserted into the groove 303, the limiting rod 402 is inserted into the limiting hole 401 through the through hole 403, so that the bucket teeth 3 and the inner bucket 1 are installed. After prolonged use, if one of the bucket teeth 3 breaks, the limiting rod 402 can be removed and the limiting plate 304 can be slid to disconnect it from the groove 303, and then the bucket teeth 3 can be disassembled and replaced, which increases the convenience of bucket tooth 3 replacement.

[0021] like Figure 8 , Figure 9 , Figure 11 and Figure 13 As shown, a partial structure of the bucket tooth 3 and the limiting member 4 is disclosed. The bucket tooth 3 includes a tooth plate 305 and an extension plate 306 welded together. An insertion rod 301 is installed on the tooth plate 305. The extension plate 306 also has a channel. During installation, the extension plate 306 is located between the inner bucket 1 and the limiting plate 304. When the extension plate 306 is inserted into the inner bucket 1, the channel is aligned with the through hole 403. A crossbar 5 is installed on the tooth plate 305. A transverse hole 6 for accommodating the crossbar 5 is opened on the extension plate 306. The inner diameter of the transverse hole 6 is larger than the diameter of the crossbar 5. When the tooth plate 305 and the extension plate 306 are connected, the movement of the crossbar 5 in the transverse hole 6 is restricted. When the tooth plate 305 breaks, the connection between the tooth plate 305 and the extension plate 306 is released, allowing the crossbar 5 to slide in the transverse hole 6. A limiting groove 404 is formed axially on the limiting rod 402, and an annular groove 405 communicating with the limiting groove 404 is formed radially on the limiting rod 402. A connecting spring 406 is installed in the limiting hole 401, and a rotation limiting block 407 for insertion into the limiting groove 404 is installed at the free end of the connecting spring 406. The width of the limiting groove 404 is greater than or equal to the width of the crossbar 5 and greater than or equal to the width of the rotation limiting block 407. When the bucket tooth 3 is in normal use, the end of the crossbar 5 is located in the through hole 403, so that when the limiting rod 402 needs to be inserted, the limiting groove 404 needs to be aligned with the crossbar 5. When the limiting rod 402 is inserted to the bottom, the end of the crossbar 5 is located in the annular groove 405. Then the limiting rod 402 is rotated. 02, causing the limiting groove 404 to be misaligned with the crossbar 5, and the limiting rod 402 continues to rotate. When the limiting rod 402 is inserted into the limiting hole 401, the side wall of the limiting rod 402 abuts against the limiting block 407, causing the limiting block 407 to give way to the limiting rod 402. When the limiting block 407 is aligned with the limiting groove 404, the connecting spring 406 pushes the limiting block 407 into the limiting groove 404, thereby limiting the rotation of the limiting rod 402 in the limiting hole 401. Since the crossbar 5 is inserted into the annular groove 405, the crossbar 5 blocks the inner wall of the annular groove 405, thereby limiting the tendency of the limiting rod 402 to separate from the limiting hole 401, thus completing the locking of the device. When the device is in use, the movement of the limiting rod 402 is locked by the locking of the rotation limiting block 407 and the crossbar 5, so that the bucket teeth 3 cannot be separated from the inner bucket 1 during use. When the bucket teeth 3 break after prolonged use, the tooth plate 305 separates from the extension plate 306, and the crossbar 5 can slide and separate in the transverse hole 6. At this time, sliding the crossbar 5 can release the obstruction of the inner wall of the ring groove 405, so that the limiting rod 402 can be pulled out from the limiting hole 401. This means that the device can only be disassembled when it is damaged, which increases the stability of the device.

[0022] like Figure 5 As shown, a portion of the structure of the inner bucket 1 is disclosed. The inner bucket 1 has a through groove 7, which connects the slot 302 to the outside. When the bucket teeth 3 are installed on the inner bucket 1, the extension plate 306 is used to cover the through groove 7. When the device is in use, the extension plate 306 covers the through groove 7, preventing soil and debris from entering the through groove 7. When the bucket teeth 3 break, some of the insertion rod 301 may remain in the slot 302. At this time, the limiting rod 402 is removed, allowing the extension plate 306 to be removed from the inner bucket 1, thus exposing the through groove 7 and the inside of the slot 302. This makes it easier for replacement personnel to clean the remaining insertion rod 301 in the slot 302, increasing the practicality of the device.

[0023] like Figure 2 and Figure 12 As shown, a portion of the structure of the inner bucket 1 is disclosed. The inner bucket 1 has an installation cavity 8, and a sliding plate 801 is slidably installed in the installation cavity 8. A push rod 802 for insertion into the slot 302 is installed on the sliding plate 801. The slot 302 is connected to the installation cavity 8. The sliding path of the sliding plate 801 is to approach or move away from the limiting hole 401. When the sliding plate 801 approaches the limiting hole 401, the push rod 802 can be inserted into the slot 302, pushing the insertion rod 301 remaining in the slot 302 towards the outside of the slot 302. An abutment rod 803 is rotatably mounted inside the mounting cavity 8. One end of the abutment rod 803 contacts the sliding plate 801, and a steel chain 804 is mounted on the other end. The abutment rod 803 acts as a lever. When the side with the steel chain 804 rotates away from the sliding plate 801, the end of the abutment rod close to the sliding plate 801 abuts against the sliding plate 801. An opening 805 communicating with the outside is provided on the side wall of the mounting cavity 8. The steel chain 804 passes through the opening 805 and connects to the outer bucket 2. When it is necessary to disassemble the bucket teeth 3, the limiting rod 402 is released, and the limiting plate 304 is removed from the groove 303. After separation, the outer bucket 2 is rotated so that its free end is away from the inner bucket 1. This causes the steel chain 804 connected to its free end to pull the abutment rod 803 to rotate. The abutment rod 803 pushes the sliding plate 801, which in turn causes the push rod 802 to abut against the insertion rod 301 remaining in the slot 302. This allows the insertion rod 301 remaining in the slot 302 to be pushed out by the push rod 802 when the inner bucket 1 and the outer bucket 2 are disassembled. This makes it easier to clean the insertion rod 301 in the slot 302, increasing the practicality of the device.

[0024] like Figure 3 , Figure 5 , Figure 8 and Figure 9As shown, a portion of the structure of the inner bucket 1 is disclosed. The inner bucket 1 has an embedded groove 9, within which an arc-shaped spring plate 10 is installed. Installing the arc-shaped spring plate 10 within the embedded groove 9 reduces the obstruction caused by protrusions on the inner bucket 1, facilitating better digging by the device. An inner recess 11 is provided on the extension plate 306. When the arc-shaped spring plate 10 is inserted into the inner recess 11, the sliding of the extension plate 306 is restricted. The inner recess 11 is located on the side wall of the extension plate 306. During normal use, the inner recess 11 is misaligned with the arc-shaped spring plate 10, and the arc-shaped spring plate 10 is further out of the inner recess 11 than the inner recess 10. The trap 11 is closer to the digging end of the device, so that if the limiting member 4 is damaged during use, causing the limitation of the extension plate 306 to be released and the sliding of the bucket teeth 3 to resume, the bucket teeth 3 will not be separated from the inner bucket 1 temporarily because the insertion rod 301 is still inserted in the slot 302. When the inner trap 11 slides to contact the arc-shaped spring plate 10, the arc-shaped spring plate 10 slides into the inner trap 11 to limit the sliding of the bucket teeth 3, which makes it easier to limit the separation of the bucket teeth 3 in time. At this time, digging can be stopped and the bucket teeth 3 can be replaced, which improves the stability of the device during use. When the device is in normal use, the distance between the recessed groove 11 and the arc-shaped spring plate 10 is less than the length of the insertion rod 301 inserted into the slot 302. This allows the slot 302 to still block and limit the insertion rod 301 when the bucket teeth 3 fall off. Subsequently, when the arc-shaped spring plate 10 is inserted into the recessed groove 11, it can also cooperate with the slot 302 to limit the tendency of the bucket teeth 3 to separate from the inner bucket 1.

[0025] like Figure 12 As shown, a portion of the structure of the mounting cavity 8 is disclosed. An anti-spring 12 is installed inside the mounting cavity 8. The free end of the anti-spring 12 is connected to the sliding plate 801. During use, the anti-spring 12 forces the sliding plate 801 close to the slot 302, so that the push rod 802 contacts the end of the insertion rod 301 in normal conditions. This allows the insertion rod 301 to be pushed out relatively quickly when disassembly is required. After the bucket teeth 3 are disassembled, the outer bucket 2 covers and wraps the inner bucket 1 again. The sliding plate 801 is then reset by the push of the anti-spring 12, which increases the practicality of the device.

[0026] like Figure 10 , Figure 11 and Figure 13 As shown, a portion of the structure of the limiting plate 304 is disclosed. The limiting plate 304 has an insertion hole 13, and a cover 14 is movably inserted into the limiting plate 304. The cover 14 is used to block the through hole 403. A hook plate 15 is installed on the cover 14 for insertion into the insertion hole 13. The hook plate 15 is as follows: Figure 10 As shown, the limiting rod 402 has a groove on its outer end, such as... Figure 10As shown, when the limiting rod 402 is rotated, the flat plate is inserted into the groove and rotated, just like tightening a screw. However, when the device is in use, soil can easily enter the groove and fill it. Therefore, when in use, the hook plate 15 is inserted into the insertion hole 13 so that the cover 14 covers the limiting rod 402 and protects the groove on it. When the device needs to be disassembled, the cover 14 can be removed with the help of pliers to expose the limiting rod 402, making it easier to disassemble and increasing the practicality of the device.

[0027] like Figure 3 , Figure 5 and Figure 9 As shown, the structure of the extension plate 306 is disclosed. A side baffle 16 is installed on the side wall of the extension plate 306. The side baffle 16 is used to cover the inner groove 9. The side baffle 16 and the limiting plate 304 are provided with inclined surfaces in the direction towards the toothed plate 305. When the extension plate 306 is in normal use, the side baffle 16 covers the inner groove 9, which reduces the possibility that soil will block the inner groove 9 and block the deformation of the arc-shaped spring plate 10 when the device is digging, thus increasing the feasibility of the device.

[0028] like Figure 7 As shown, a portion of the structure of the limiting plate 304 is disclosed. A guide rod 17 is installed on the limiting plate 304, and a guide hole 18 is provided on the outer bucket 2 to accommodate the guide rod 17. The guide rod 17 is inserted into the guide hole 18 so that the inner wall of the guide hole 18 blocks the side wall of the guide rod 17, so that the limiting plate 304 can only move closer to or away from the outer bucket 2 in a straight line, which increases the stability of the limiting plate 304 during use.

[0029] like Figure 3 As shown, in some embodiments, the outer bucket 2 is equipped with multiple reinforcing ribs 19. When the extension plate 306 is installed on the inner bucket 1, its end contacts the end of the reinforcing rib 19. The reinforcing ribs 19 increase the rigidity of the outer bucket 2. When the extension plate 306 is inserted into the inner bucket 1, its end contacts the reinforcing rib 19, so that a connection can be formed between the extension plate 306 and the reinforcing rib 19. Figure 3 The structure shown prevents a height difference between the extension plate 306 and the reinforcing rib 19, reducing the excessive contact area between the device and the soil and rock. This allows the device to be inserted into the soil and rock more smoothly when excavating, increasing the feasibility of the device.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-layer earthmoving excavation bucket, characterized in that, include: An inner bucket (1) is hinged to an outer bucket (2), which encloses the inner bucket (1) on the outside; Bucket teeth (3) are equipped with insertion rods (301). The inner bucket (1) is provided with slots (302) for accommodating the insertion rods (301). The bucket teeth (3) are provided with grooves (303). The outer bucket (2) is slidably equipped with a limiting plate (304) for insertion into the grooves (303). The limiting member (4) has a limiting hole (401) on the inner bucket (1). The limiting member (4) includes a limiting rod (402) for insertion into the limiting hole (401). The limiting plate (304) has a through hole (403) for the limiting rod (402) to pass through. When the limiting rod (402) is inserted into the limiting hole (401), the rotation of the outer bucket (2) is restricted, and the sliding of the limiting plate (304) is restricted.

2. The double-layer earthmoving excavation bucket according to claim 1, characterized in that, The bucket teeth (3) include tooth plates (305) and extension plates (306) welded together. An insertion rod (301) is installed on the tooth plate (305). A crossbar (5) is installed on the tooth plate (305). A transverse hole (6) for accommodating the crossbar (5) is opened on the extension plate (306). A limiting groove (404) is opened along the axial direction on the limiting rod (402). An annular groove (405) communicating with the limiting groove (404) is opened along the radial direction on the limiting rod (402). A connecting spring (406) is installed in the limiting hole (401). A rotation limiting block (407) for inserting into the limiting groove (404) is installed at the free end of the connecting spring (406).

3. The double-layer earthmoving excavation bucket according to claim 2, characterized in that, The inner bucket (1) is provided with a through groove (7), which allows the slot (302) to communicate with the outside. When the bucket teeth (3) are installed on the inner bucket (1), the extension plate (306) is used to cover the through groove (7).

4. The double-layer earthmoving excavation bucket according to claim 3, characterized in that, An installation cavity (8) is provided on the inner bucket (1). A sliding plate (801) is slidably installed in the installation cavity (8). A push rod (802) for inserting into the slot (302) is installed on the sliding plate (801). An abutment rod (803) is rotatably installed in the installation cavity (8). One end of the abutment rod (803) contacts the sliding plate (801), and a steel chain (804) is installed on the other end. An opening (805) communicating with the outside is provided on the side wall of the installation cavity (8). The steel chain (804) passes through the opening (805) and connects to the outer bucket (2).

5. The double-layer earthmoving excavation bucket according to claim 4, characterized in that, The inner bucket (1) is provided with an inner groove (9), and an arc-shaped spring plate (10) is installed in the inner groove (9). The extension plate (306) is provided with an inner recess (11). When the arc-shaped spring plate (10) is inserted into the inner recess (11), the sliding of the extension plate (306) is restricted.

6. The double-layer earthmoving excavation bucket according to claim 5, characterized in that, An abutment spring (12) is installed in the mounting cavity (8), and the free end of the abutment spring (12) is connected to the sliding plate (801).

7. The double-layer earthmoving excavation bucket according to claim 6, characterized in that, The limiting plate (304) has an insertion hole (13) and a cover (14) is movably inserted into the limiting plate (304). The cover (14) is used to cover the through hole (403) and a hook plate (15) is installed on the cover (14) for insertion into the insertion hole (13).

8. The double-layer earthmoving excavation bucket according to claim 7, characterized in that, A side baffle (16) is installed on the side wall of the extension plate (306). The side baffle (16) is used to cover the inner groove (9). The side baffle (16) and the limiting plate (304) have inclined surfaces in the direction towards the toothed plate (305).

9. The double-layer earthmoving excavation bucket according to claim 8, characterized in that, A guide rod (17) is installed on the limiting plate (304), and a guide hole (18) for accommodating the guide rod (17) is provided on the outer bucket (2).

10. The double-layer earthmoving excavation bucket according to claim 9, characterized in that, The outer bucket (2) is equipped with multiple reinforcing ribs (19), and when the extension plate (306) is installed on the inner bucket (1), its end contacts the end of the reinforcing rib (19).

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