An edge protection device for the blade of an excavator bucket and its usage method

Abstract

The present invention discloses an edge protection device for the shovel blade of an excavator and its usage method, which includes an excavator. The excavator is rotatably connected with a push rod, the push rod is fixedly connected with a push plate, the push plate is fixedly connected with a shovel blade, the excavator is rotatably connected with an oil cylinder, and the other end of the oil cylinder is rotatably connected with the push rod. A T-shaped block is further arranged below the push rod; the bottom end of the T-shaped block is slidably connected with a moving plate, the T-shaped block is rotatably connected with the excavator, and the T-shaped block is connected to the excavator through a first tension spring; the moving plate is connected to the T-shaped block through a second tension spring. The excavator is also fixedly connected with a convex push plate that cooperates with the moving plate. One end of the moving plate close to the shovel blade is fixedly connected with a protection plate, and the oil cylinder is connected with a controller. This device can enable the protection plate to support the edge of the earth-moving shovel blade, avoiding the direct contact between the edge of the earth-moving shovel blade and the ground when the earth-moving shovel is used as a support, thus preventing damage to the ground. At the same time, it can also play a certain protective role for the edge of the shovel blade.

Description

Technical Field

[0001] The present invention relates to the technical field of excavators, and particularly relates to an edge protection device for the blade of an excavator scraper plate and a using method thereof. Background Art

[0002] A bulldozer blade is a commonly used device for earthmoving in construction machinery and is often a standard configuration for mini excavators. The maximum width of the bulldozer blade is generally the same as the width of the whole machine chassis. The excavator bulldozer blade can play a role in removing obstacles in front, cleaning the road surface or fixing the body under certain working conditions. Its control lever is set in the excavator cab, and the driver controls the lifting of the bulldozer blade through the control lever to assist the operation of the excavator working device.

[0003] With the continuous transformation and replacement of urbanization and the popularization of agricultural mechanization, the working conditions of mini excavators are increasing, and the usage requirements are constantly improving. For example, in some foreign regions, it is required that the excavator does not damage the ground when operating on public roads. For a conventional bulldozer blade, when it supports the ground, its edge is bound to contact the blade edge of the scraper, resulting in relative movement and interaction, which causes damage to the ground by the blade edge of the scraper, thus bringing unnecessary losses and affecting the construction efficiency. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, an edge protection device for the blade of an excavator scraper plate and a using method thereof are provided.

[0005] The technical solution adopted by the present invention to solve its technical problems is:

[0006] The present invention provides an edge protection device for the blade of an excavator scraper plate, including an excavator. The excavator is rotatably connected with a push rod, the push rod is fixedly connected with a push plate, the push plate is fixedly connected with a scraper, the excavator is rotatably connected with an oil cylinder, the other end of the oil cylinder is rotatably connected with the push rod, and a T-shaped block is further arranged below the push rod; the bottom end of the T-shaped block is slidably connected with a moving plate, the T-shaped block is rotatably connected with the excavator, and the T-shaped block is connected with the excavator through a first pulling spring; the moving plate is connected with the T-shaped block through a second pulling spring, the excavator is further fixedly connected with a convex push plate matched with the moving plate, a protection plate is fixedly connected to one end of the moving plate close to the scraper, and the oil cylinder is connected with a controller.

[0007] Preferably, the right end of the second pulling spring is connected with the T-shaped block, and the left end of the second pulling spring is connected with the moving plate.

[0008] Preferably, the second pulling spring is arranged above the convex push plate, and the convex push plate is arranged on one side of the second pulling spring.

[0009] Preferably, the convex push plate includes an inclined surface. The excavator is fixedly connected with a push rod. In the initial state, under the action of the second tension spring, the moving plate contacts the inclined surface. Under the action of the first tension spring, the T-shaped block contacts the push rod.

[0010] Preferably, a fixed rod is fixedly connected to the upper end of the T-shaped block. The fixed rod is arranged on one side of the push rod. The fixed rod is rotatably connected with a sliding sleeve. A sliding rod is slidably connected in the sliding sleeve. The bottom end of the sliding rod is rotatably connected with the push rod.

[0011] Preferably, a chute is opened in the sliding sleeve. A locking block is slidably connected in the chute. The locking block is connected with the sliding sleeve through a spring.

[0012] Preferably, a fixed arc block is fixedly connected to the top end of the sliding rod. A conical block is slidably connected to the sliding rod. The fixed arc block is located above the conical block; the lower surface of the fixed arc block is a horizontal plane, and a groove adapted to the conical block is opened on the lower surface of the fixed arc block.

[0013] Preferably, a third tension spring is sleeved on the sliding rod. The upper end of the third tension spring is connected with the conical block, and the lower end of the third tension spring is connected with the sliding rod. The elastic force of the spring is greater than the elastic force of the third tension spring, and the elastic force of the first tension spring is greater than the elastic force of the spring.

[0014] Preferably, when the fixed arc block moves above the locking block, the shovel blade rotates above the protection plate at this time.

[0015] The present invention also provides a use method of a protection device for the edge of an excavator shovel blade, which adopts the above protection device for the edge of an excavator shovel blade, and includes the following steps:

[0016] S1: When it is necessary to protect the shovel blade, the controller controls the oil cylinder to contract. The oil cylinder drives the push rod to rotate clockwise around the excavator. The push rod drives the sliding rod to rotate. At this time, the T-shaped block contacts the push rod. Under the action of the push rod, the fixed rod and the T-shaped block do not rotate. During this process, the sliding rod slides in the sliding sleeve;

[0017] S2: As the push rod rotates clockwise, the sliding rod moves upward relative to the sliding sleeve. After the fixed arc block contacts the locking block, it drives the locking block to move, so that the fixed arc block jumps over the locking block. At this time, the locking block is located between the fixed arc block and the conical block, and the shovel blade moves above the protection plate;

[0018] S3: The controller controls the oil cylinder to extend. The oil cylinder drives the push rod to rotate counterclockwise around the excavator. The locking block contacts the horizontal plane of the fixed arc block. The push rod drives the sliding sleeve to rotate through the sliding rod. The sliding sleeve drives the T-shaped block to rotate counterclockwise through the fixed rod;

[0019] S4: As the T-shaped block rotates counterclockwise, the moving plate comes into contact with the inclined surface of the convex push plate. Under the action of the convex push plate, the moving plate is driven to move away from the excavator, causing the protection plate to move below the cutting edge, thereby protecting the cutting edge. At this time, both the first tension spring and the second tension spring are in a stretched state;

[0020] S5: When protection needs to be released, the controller controls the oil cylinder to contract. The oil cylinder drives the push rod and the T-shaped block to move clockwise. Under the action of the second tension spring, the moving plate resets. When the T-shaped block comes into contact with the ejector rod, the T-shaped block no longer rotates clockwise;

[0021] S6: As the oil cylinder continues to contract, as the sliding rod moves upward relative to the sliding sleeve, the conical block jumps over the locking block. Then the controller controls the oil cylinder to extend. After the conical block comes into contact with the locking block, as the oil cylinder continues to extend, the third tension spring is stretched, causing the conical block to move into the groove of the fixed arc block;

[0022] S7: As the oil cylinder continues to extend, after the conical block comes into contact with the locking block, the locking block is driven to move, compressing the spring. The conical block drives the fixed arc block to jump over the locking block, so that the fixed arc block moves below the locking block, and finally the protection plate moves to one side of the cutting edge.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The present invention is provided with a protection plate. When the oil cylinder drives the push rod to rotate upward, the connection between the sliding rod and the sliding sleeve can be completed. At this time, the cutting edge is located above the protection plate. When the push rod rotates downward, the protection plate can be driven to rotate together. After the moving plate comes into contact with the convex push plate, under the action of the convex push plate, the moving plate can be driven to move away from the excavator, so that the protection plate can move below the cutting edge, thereby realizing the support and protection of the cutting edge, avoiding the direct contact between the cutting edge of the earthmoving shovel and the ground when the earthmoving shovel is used as a support, which may damage the ground, and at the same time, it can also play a certain role in protecting the cutting edge of the shovel.

[0025] 2. The present invention is provided with a fixed arc block. When the sliding rod rotates upward, due to the action of the ejector rod, the sliding sleeve cannot move upward. Therefore, the sliding rod can move upward relative to the sliding sleeve. After the fixed arc block jumps over the locking block, the horizontal plane of the fixed arc block comes into contact with the locking block. At this time, because the contact surface is a horizontal plane, when the push rod rotates downward, the sliding sleeve can be driven to rotate downward simultaneously through the sliding rod. At this time, the protection plate can be extended. When the oil cylinder contracts, the conical block can be driven to jump over the locking block. At this time, the conical block is stuck in the groove of the fixed arc block. Therefore, the conical block can drive the fixed arc block to jump over the locking block, thereby realizing unlocking. The operation is convenient, the structure is simple and ingenious, and the fixing work of the protection plate can be better realized, and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0027] Figure 1 is the overall front view in the present invention;

[0028] Figure 2 is Figure 1 an enlarged view of the structure of part K in

[0029] Figure 3 is Figure 2 an enlarged view of the structure of part N in

[0030] Figure 4 is Figure 2 a schematic view of the structure in the A direction in

[0031] Figure 5 is Figure 2 a schematic view of the structure in the B direction in

[0032] Figure 6 is Figure 5 a schematic view of the structure of the S-S part in

[0033] Description of reference numerals:

[0034] 1 Excavator; 2 Scraper blade; 3 Protection plate; 4 Moving plate; 5 Pushing plate; 6 T-shaped block; 7 Push rod; 8 Fixed rod; 9 Slide rod; 10 Slide sleeve; 11 Oil cylinder; 12 Jacking rod; 13 First tension spring; 14 Second tension spring; 15 Convex pushing plate; 16 Tapered block; 17 Fixed arc block; 18 Locking block; 19 Spring; 20 Third tension spring. Detailed description of the specific implementation

[0035] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0036] As Figures 1-6 shown, this embodiment proposes a protection device for the blade edge of the scraper blade of an excavator, including an excavator 1. The excavator 1 is rotatably connected with a push rod 7. The push rod 7 is fixedly connected with a pushing plate 5. The pushing plate 5 is fixedly connected with a scraper blade 2. The pushing plate 5 can drive the scraper blade 2 to move, and the scraper blade 2 can realize the shoveling of materials, thereby realizing the earth-shoveling action.

[0037] The excavator 1 is rotatably connected with an oil cylinder 11. The other end of the oil cylinder 11 is rotatably connected with the push rod 7. The oil cylinder 11 is connected with a controller. The controller can control the operation of the oil cylinder 11. The oil cylinder 11 can drive the push rod 7 to rotate around the excavator 1, thereby realizing the adjustment of the angle of the scraper blade 2.

[0038] A T-shaped block 6 is further arranged below the push rod 7. A moving plate 4 is slidably connected to the bottom end of the T-shaped block 6. The right end of the T-shaped block 6 is rotatably connected to the excavator 1. The T-shaped block 6 is connected to the excavator 1 through a first tension spring 13.

[0039] The upper end of the first tension spring 13 is connected to the excavator 1, and the lower end of the first tension spring 13 is connected to the T-shaped block 6. The T-shaped block 6 and the moving plate 4 are always in a slidable connection state. The first tension spring 13 is used for the reset work of the T-shaped block 6.

[0040] The moving plate 4 is connected to the T-shaped block 6 through a second tension spring 14. The excavator 1 is also fixedly connected with a convex push plate 15 that cooperates with the moving plate 4. A protection plate 3 is fixedly connected to one end of the moving plate 4 close to the shovel 2.

[0041] The right end of the second tension spring 14 is connected to the T-shaped block 6, and the left end of the second tension spring 14 is connected to the moving plate 4. The second tension spring 14 is used for the reset work of the position of the moving plate 4.

[0042] The second tension spring 14 is arranged above the convex push plate 15. The convex push plate 15 is arranged on one side of the second tension spring 14. When the T-shaped block 6 drives the moving plate 4 to rotate, the second tension spring 14 can move on one side of the convex push plate 15, thereby preventing the convex push plate 15 from having an unnecessary influence on the movement of the second tension spring 14.

[0043] The convex push plate 15 includes an inclined surface. The excavator 1 is fixedly connected with a push rod 12. In the initial state, under the action of the second tension spring 14, the moving plate 4 is in contact with the inclined surface. Therefore, when the T-shaped block 6 drives the moving plate 4 to rotate, the moving plate 4 can slide along the inclined surface of the convex push plate 15, so that the moving plate 4 moves away from the excavator 1.

[0044] Under the action of the first tension spring 13, the T-shaped block 6 is in contact with the push rod 12. At this time, the T-shaped block 6 is in a state with the ground. The push rod 12 plays a role in limiting the movement of the T-shaped block 6. Under the action of the push rod 12, the T-shaped block 6 is prevented from rotating too much distance.

[0045] A fixing rod 8 is fixedly connected to the upper end of the T-shaped block 6. The fixing rod 8 is arranged on one side of the push rod 7. Therefore, when the push rod 7 moves, it will not affect the fixing rod 8. The fixing rod 8 is rotatably connected with a sliding sleeve 10. A sliding rod 9 is slidably connected in the sliding sleeve 10. The bottom end of the sliding rod 9 is rotatably connected to the push rod 7.

[0046] When the oil cylinder 11 drives the push rod 7 to rotate clockwise, the push rod 7 drives the sliding rod 9 to rotate. Due to the limitation of the push rod 12, the T-shaped block 6 will not rotate clockwise following the sliding rod 9. At this time, the sliding rod 9 can move upward in the sliding sleeve 10.

[0047] A chute is provided inside the sliding sleeve 10. A locking block 18 is slidably connected inside the chute. The locking block 18 is connected to the sliding sleeve 10 through a spring 19. The locking block 18 can only slide in the horizontal direction. The left end of the spring 19 is connected to the sliding sleeve 10, and the right end of the spring 19 is connected to the locking block 18.

[0048] A fixed arc block 17 is fixedly connected to the top end of the sliding rod 9. A tapered block 16 is slidably connected to the sliding rod 9. The fixed arc block 17 is located above the tapered block 16. The lower surface of the fixed arc block 17 is a horizontal plane, and a groove adapted to the tapered block 16 is provided on the lower surface of the fixed arc block 17.

[0049] The spring 19 is used for the reset work of the locking block 18. In the initial state, under the action of the spring 19, one end of the locking block 18 is located inside the sliding sleeve 10. At this time, the locking block 18 is located above the fixed arc block 17. The upper surface of the locking block 18 is provided with a straight surface. When the horizontal plane and the straight surface are in contact, since the contact surface is horizontal, when the sliding rod 9 moves downward, the sliding sleeve 10 can be driven to move simultaneously.

[0050] A third tension spring 20 is sleeved on the sliding rod 9. The upper end of the third tension spring 20 is connected to the tapered block 16, and the lower end of the third tension spring 20 is connected to the sliding rod 9. The elastic force of the spring 19 is much greater than the elastic force of the third tension spring 20. The elastic force of the first tension spring 13 is greater than the elastic force of the spring 19.

[0051] The third tension spring 20 is used for the reset work of the tapered block 16. The upper surface and the lower surface of the tapered block 16 are both provided with inclined surfaces. Among them, the upper surface of the tapered block 16 is adapted to the groove of the fixed arc block 17, and the tapered block 16 can be clamped into the groove of the fixed arc block 17.

[0052] Due to the nature of the tension spring itself, the tension spring cannot be compressed. Therefore, when the sliding rod 9 moves upward, the tapered block 16 can drive the locking block 18 to move, so that the tapered block 16 jumps over the locking block 18. When the tapered block 16 is located above the locking block 18, when the sliding rod 9 moves downward at this time, since the elastic force of the spring 19 is much greater than the elastic force of the third tension spring 20, the third tension spring 20 is first stretched, so that the tapered block 16 can be moved into the groove of the fixed arc block 17, thereby realizing the cooperation between the tapered block 16 and the fixed arc block 17.

[0053] By reasonably setting the height of the T-shaped block 6, it is ensured that when the fixed arc block 17 moves above the locking block 18, the shovel blade 2 just rotates above the protection plate 3 at this time. In the initial state, the protection plate 3 is located below the shovel blade 2, and at the same time, the protection plate 3 is higher than the bottom end of the shovel blade 2. Therefore, the protection plate 3 does not affect the normal movement of the shovel blade 2.

[0054] The present invention also proposes a usage method of an edge protection device for an excavator shovel blade, which also includes the above-mentioned edge protection device for an excavator shovel blade, and includes the following steps:

[0055] S1: When protection for the blade 2 is required, the controller controls the cylinder 11 to contract. The cylinder 11 drives the push rod 7 to rotate clockwise around the excavator 1. The push rod 7 drives the sliding rod 9 to rotate. At this time, the T-shaped block 6 contacts the ejector rod 12. Under the action of the ejector rod 12, the fixed rod 8 and the T-shaped block 6 do not rotate. During this process, the sliding rod 9 slides within the sliding sleeve 10;

[0056] S2: As the push rod 7 rotates clockwise, the sliding rod 9 moves upward relative to the sliding sleeve 10. After the fixed arc block 17 contacts the locking block 18, it drives the locking block 18 to move, causing the fixed arc block 17 to jump over the locking block 18. At this time, the locking block 18 is located between the fixed arc block 17 and the conical block 16, and the blade 2 moves above the protection plate 3;

[0057] S3: The controller controls the cylinder 11 to extend. The cylinder 11 drives the push rod 7 to rotate counterclockwise around the excavator 1. The locking block 18 contacts the horizontal plane of the fixed arc block 17. The push rod 7 drives the sliding sleeve 10 to rotate through the sliding rod 9, and the sliding sleeve 10 drives the T-shaped block 6 to rotate counterclockwise through the fixed rod 8;

[0058] S4: As the T-shaped block 6 rotates counterclockwise, the moving plate 4 contacts the inclined surface of the convex push plate 15. Under the action of the convex push plate 15, it drives the moving plate 4 to move away from the excavator 1, causing the protection plate 3 to move below the blade 2, thereby protecting the blade 2. At this time, both the first tension spring 13 and the second tension spring 14 are in a stretched state;

[0059] S5: When protection needs to be released, the controller controls the cylinder 11 to contract. The cylinder 11 drives the push rod 7 and the T-shaped block 6 to move clockwise. Under the action of the second tension spring 14, the moving plate 4 resets. When the T-shaped block 6 contacts the ejector rod 12, the T-shaped block 6 no longer rotates clockwise;

[0060] S6: As the cylinder 11 continues to contract, as the sliding rod 9 moves upward relative to the sliding sleeve 10, the conical block 16 jumps over the locking block 18. Then the controller controls the cylinder 11 to extend. After the conical block 16 contacts the locking block 18, as the cylinder 11 continues to extend, the third tension spring 20 is stretched, thereby causing the conical block 16 to move into the groove of the fixed arc block 17;

[0061] S7: As the cylinder 11 continues to extend, after the conical block 16 contacts the locking block 18, it drives the locking block 18 to move, compressing the spring 19. The conical block 16 drives the fixed arc block 17 to jump over the locking block 18, thereby causing the fixed arc block 17 to move below the locking block 18, and finally causing the protection plate 3 to move to one side of the blade 2.

[0062] It should be noted that when the oil cylinder 11 drives the push rod 7 to rotate upward, the connection work of the sliding rod 9 and the sliding sleeve 10 can be completed. At this time, the scraper 2 is located above the protection plate 3. When the push rod 7 rotates downward, it can drive the protection plate 3 to rotate together. After the moving plate 4 contacts the convex push plate 15, under the action of the convex push plate 15, the moving plate 4 can be driven to move away from the excavator 1, so that the protection plate 3 can move below the scraper 2, thereby realizing the support and protection of the scraper 2, avoiding the direct contact between the cutting edge of the earthmoving scraper 2 and the ground when the earthmoving scraper is used as a support, and at the same time, it can also play a certain protective role for the cutting edge of the scraper 2.

[0063] In addition, when the sliding rod 9 rotates upward, due to the action of the ejector rod 12, the sliding sleeve 10 cannot move upward. Therefore, the sliding rod 9 can move upward relative to the sliding sleeve 10. After the fixed arc block 17 jumps over the locking block 18, the horizontal plane of the fixed arc block 17 contacts the locking block 18. At this time, because the contact surface is a horizontal plane, when the push rod 7 rotates downward, it can drive the sliding sleeve 10 to rotate downward simultaneously through the sliding rod 9. At this time, the protection plate 3 can be extended. When the oil cylinder 11 contracts, it can drive the conical block 16 to jump over the locking block 18. At this time, the conical block 16 is stuck in the groove of the fixed arc block 17. Therefore, the conical block 16 can drive the fixed arc block 17 to jump over the locking block 18, thereby realizing unlocking. The operation is convenient, the structure is simple and ingenious, and the fixing work of the protection plate 3 can be better realized, and the working efficiency is high.

[0064] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An edge protection device for the blade of an excavator bucket, comprising an excavator (1), a push rod (7) is rotatably connected to the excavator (1), a push plate (5) is fixedly connected to the push rod (7), and a bucket (2) is fixedly connected to the push plate (5), characterized in that, The excavator (1) is rotatably connected with an oil cylinder (11), the other end of the oil cylinder (11) is rotatably connected with the push rod (7), and a T-shaped block (6) is further arranged below the push rod (7); the bottom end of the T-shaped block (6) is slidably connected with a moving plate (4), the T-shaped block (6) is rotatably connected with the excavator (1), and the T-shaped block (6) is connected with the excavator (1) through a first tension spring (13); the moving plate (4) is connected with the T-shaped block (6) through a second tension spring (14), the excavator (1) is further fixedly connected with a convex push plate (15) which is matched with the moving plate (4), one end of the moving plate (4) close to the cutting blade (2) is fixedly connected with a protection plate (3), and the oil cylinder (11) is connected with a controller.

2. The edge protection device for the blade of an excavator bucket according to claim 1, characterized in that, The right end of the second tension spring (14) is connected with the T-shaped block (6), and the left end of the second tension spring (14) is connected with the moving plate (4).

3. The edge protection device for the blade of the excavator bucket according to claim 2, characterized in that, The second tension spring (14) is arranged above the convex push plate (15), and the convex push plate (15) is arranged on one side of the second tension spring (14).

4. The edge protection device for the shovel blade of an excavator according to claim 3, characterized in that, The convex push plate (15) includes an inclined surface, the excavator (1) is fixedly connected with a push rod (12), in the initial state, under the action of the second tension spring (14), the moving plate (4) is in contact with the inclined surface, and under the action of the first tension spring (13), the T-shaped block (6) is in contact with the push rod (12).

5. The edge protection device for the shovel blade of an excavator according to claim 4, characterized in that, A fixed rod (8) is fixedly connected to the upper end of the T-shaped block (6), the fixed rod (8) is arranged on one side of the push rod (7), the fixed rod (8) is rotatably connected with a sliding sleeve (10), a sliding rod (9) is slidably connected in the sliding sleeve (10), and the bottom end of the sliding rod (9) is rotatably connected with the push rod (7).

6. The edge protection device for the shovel blade of an excavator according to claim 5, characterized in that, A sliding groove is formed in the sliding sleeve (10), a locking block (18) is slidably connected in the sliding groove, and the locking block (18) is connected with the sliding sleeve (10) through a spring (19).

7. The edge protection device for the shovel blade of an excavator according to claim 6, characterized in that, A fixed arc block (17) is fixedly connected to the top end of the sliding rod (9), a conical block (16) is slidably connected to the sliding rod (9), and the fixed arc block (17) is located above the conical block (16); the lower surface of the fixed arc block (17) is a horizontal plane, and a groove adapted to the conical block (16) is formed in the lower surface of the fixed arc block (17).

8. The edge protection device for the shovel blade of an excavator according to claim 7, characterized in that, A third tension spring (20) is sleeved on the sliding rod (9), the upper end of the third tension spring (20) is connected with the conical block (16), the lower end of the third tension spring (20) is connected with the sliding rod (9), the elastic force of the spring (19) is greater than the elastic force of the third tension spring (20), and the elastic force of the first tension spring (13) is greater than the elastic force of the spring (19).

9. The edge protection device for the shovel blade of an excavator according to claim 8, wherein When the fixed arc block (17) moves above the locking block (18), at this time, the cutting blade (2) rotates above the protection plate (3).

10. A method for using a cutting edge protection device for an excavator bucket blade, characterized in that, Adopting the excavator cutting blade edge protection device described in claim 9, it includes the following steps: S1: When protection for the blade (2) is required, the controller controls the oil cylinder (11) to contract. The oil cylinder (11) drives the push rod (7) to rotate clockwise around the excavator (1). The push rod (7) drives the sliding rod (9) to rotate. At this time, the T-shaped block (6) contacts the ejector rod (12). Under the action of the ejector rod (12), the fixed rod (8) and the T-shaped block (6) do not rotate. During this process, the sliding rod (9) slides within the sliding sleeve (10). S2: As the push rod (7) rotates clockwise, the sliding rod (9) moves upward relative to the sliding sleeve (10). After the fixed arc block (17) contacts the locking block (18), it drives the locking block (18) to move, causing the fixed arc block (17) to jump over the locking block (18). At this time, the locking block (18) is located between the fixed arc block (17) and the conical block (16), and the blade (2) moves above the protection plate (3). S3: The controller controls the oil cylinder (11) to extend. The oil cylinder (11) drives the push rod (7) to rotate counterclockwise around the excavator (1). The locking block (18) contacts the horizontal plane of the fixed arc block (17). The push rod (7) drives the sliding sleeve (10) to rotate through the sliding rod (9), and the sliding sleeve (10) drives the T-shaped block (6) to rotate counterclockwise through the fixed rod (8). S4: As the T-shaped block (6) rotates counterclockwise, the moving plate (4) contacts the inclined surface of the convex push plate (15). Under the action of the convex push plate (15), it drives the moving plate (4) to move away from the excavator (1), causing the protection plate (3) to move below the blade (2), thereby protecting the blade (2). At this time, both the first tension spring (13) and the second tension spring (14) are in a stretched state. S5: When protection needs to be released, the controller controls the oil cylinder (11) to contract. The oil cylinder (11) drives the push rod (7) and the T-shaped block (6) to move clockwise. Under the action of the second tension spring (14), the moving plate (4) resets. When the T-shaped block (6) contacts the ejector rod (12), the T-shaped block (6) no longer rotates clockwise. S6: As the oil cylinder (11) continues to contract, as the sliding rod (9) moves upward relative to the sliding sleeve (10), the conical block (16) jumps over the locking block (18). Then the controller controls the oil cylinder (11) to extend. After the conical block (16) contacts the locking block (18), as the oil cylinder (11) continues to extend, the third tension spring (20) is stretched, causing the conical block (16) to move into the groove of the fixed arc block (17). S7: As the oil cylinder (11) continues to extend, after the conical block (16) contacts the locking block (18), it drives the locking block (18) to move, compressing the spring (19). The conical block (16) drives the fixed arc block (17) to jump over the locking block (18), causing the fixed arc block (17) to move below the locking block (18), and finally causing the protection plate (3) to move to one side of the blade (2).

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