A shovel dipper that is easy to maintain

By combining limiting components, magnets, and control components, the disassembly process of the electric shovel bucket baffle is simplified, solving the problem of cumbersome baffle disassembly in the existing technology and realizing convenient maintenance operations.

CN116290194BActive Publication Date: 2026-06-12HUANENG YIMIN COAL POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUANENG YIMIN COAL POWER CO LTD
Filing Date
2023-03-02
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

The disassembly and maintenance of the existing electric shovel bucket baffle is cumbersome, increasing the workload for users.

Method used

An easy-to-maintain electric shovel bucket was designed. Through the cooperation of limiting components, magnets, magnetic blocking components and control components, the pin rod is locked and unlocked by the transmission of magnetic repulsion force by the magnet, which simplifies the disassembly process of the baffle.

Benefits of technology

This reduces the difficulty of maintenance operations and ensures the stable use of the electric shovel bucket.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a convenient-to-maintain electric shovel bucket, which comprises a bucket mechanism and a connecting mechanism, wherein the bucket mechanism comprises a bucket body, a connecting seat located at the top of the bucket body, a connecting plate located at the inner side of the connecting seat, a baffle located at the lower part of the connecting plate and a reinforcing rib located at the outer side of the bucket body; and the connecting mechanism comprises an outer cylinder arranged at the outer side of the connecting seat, a mounting seat arranged at the lower part of the outer cylinder, a pin joint rod penetrating through the inner part of the outer cylinder and a limiting piece arranged at the outer side of the pin joint rod. The limiting piece, the magnet, the magnet blocking piece and the control piece are matched and arranged, the locking and unlocking of the pin joint rod are controlled through the transmission of the magnetic repulsion force of the magnet, the pin joint rod is convenient to use in extension and retraction, the user can conveniently remove the baffle or the connecting mechanism as a whole for maintenance, the overall operation difficulty of the maintenance operation is reduced, and the stable use of the electric shovel bucket is ensured.
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Description

Technical Field

[0001] This invention relates to the field of open-pit mining, and in particular to an easy-to-maintain electric shovel bucket. Background Technology

[0002] Electric shovels are one of the main mining equipment in open-pit mines with a capacity of tens of millions of tons. The bucket is the main component of the electric shovel, which directly bears the force of the ore being excavated. The bucket is connected to the main body of the electric shovel through the boom, which transmits the pushing force to the bucket. Under the combined action of pushing and lifting forces, the bucket completes the action of digging the soil. Most existing buckets have a single connecting pin, which requires the pin and the baffle to be removed together when disassembling and maintaining the baffle. This operation is cumbersome and increases the workload of users. Therefore, an electric shovel bucket that is easy to disassemble and maintain with a convenient baffle is designed. Summary of the Invention

[0003] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this section, the abstract and title of the invention. Such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0005] Therefore, the present invention aims to solve the technical problem of the inconvenience of removing and maintaining the baffle in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an easy-to-maintain electric shovel bucket, comprising a bucket mechanism including a bucket body, a connecting seat located at the top of the bucket body, a connecting plate located inside the connecting seat, a baffle located at the lower part of the connecting plate, and a reinforcing rib located on the outer side of the bucket body; and,

[0007] The connecting mechanism includes an outer cylinder disposed on the outside of the connecting seat, a mounting seat disposed at the lower part of the outer cylinder, a pin rod passing through the inside of the outer cylinder, a limiting member disposed on the outside of the pin rod, a cover disposed on the outside of the limiting member, a magnet disposed in the middle section of the inner wall of the outer cylinder, a magnetic blocking member disposed on the outside of the magnet, and a control member disposed on the outside of the magnetic blocking member.

[0008] The limiting component includes a slide block disposed inside the outer cylinder, the top of the slide block having a groove, the inside of the groove having a limiting ball, the bottom of the slide block having a spring, and the top of the slide block having a push plate.

[0009] The magnetic blocking component includes a rotating plate located between the push plate and the magnet. The surface of the rotating plate is provided with a guide groove. A movable plate is provided on the outer side of the rotating plate. A guide post is provided at the bottom of the movable plate. A guide plate is provided on the outer side of the movable plate.

[0010] The control component includes a lifting plate disposed on the upper part of the outer cylinder, a push rod disposed on the top of the lifting plate, a hinge seat disposed on the bottom of the lifting plate, and a traction rod connected to the lower part of the hinge seat.

[0011] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, the baffle and the bucket body are rotatably connected, and the baffle and the bucket body cooperate with each other.

[0012] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, the inner wall of the outer cylinder is further provided with a support plate, a limiting plate and a fixing ring in sequence.

[0013] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, the limiting ball is arranged in an elliptical shape, and two limiting balls are symmetrically arranged about the axis of the slide block.

[0014] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, wherein: the outer wall of the pin rod located inside the outer cylinder has a groove that cooperates with the limiting ball.

[0015] As a preferred embodiment of the easy-to-maintain electric shovel bucket of the present invention, the push plate, the movable plate and the magnet are all configured with the same magnetic poles.

[0016] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, wherein: the inner edge of the rotating plate is provided with a roller groove that cooperates with the fixed ring, and the rotating plate and the outer cylinder are rotatably connected.

[0017] As a preferred embodiment of the electric shovel bucket that is easy to maintain according to the present invention, the guide groove is configured in a quarter-elliptical arc shape, and the guide post and the guide groove form a sliding structure.

[0018] As a preferred embodiment of the easy-to-maintain electric shovel bucket of the present invention, the guide plate is symmetrically arranged about the movable plate, and both ends of the guide plate are fixed to the inner wall of the outer cylinder.

[0019] As a preferred embodiment of the easy-to-maintain electric shovel bucket of the present invention, the rotating plate and the lifting plate form a linkage structure through a traction rod, and the two ends of the traction rod are respectively hinged to the lifting plate and the rotating plate.

[0020] The beneficial effects of this invention are as follows: By cooperating with the limiting component, magnet, magnetic blocking component, and control component, the locking and unlocking of the pin rod is controlled by the transmission of magnetic repulsion force by the magnet, making the extension and retraction of the pin rod convenient. This allows users to easily remove the baffle or connecting mechanism as a whole for maintenance, reducing the overall operational difficulty of maintenance work and ensuring the stable use of the electric shovel bucket. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0022] Figure 1 A schematic diagram of the overall structure of an easy-to-maintain electric shovel bucket according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the connecting mechanism in the bucket of an electric shovel, provided as an embodiment of the present invention, for easy maintenance;

[0024] Figure 3 A front cross-sectional view of the connecting mechanism in the bucket of an electric shovel, which is easy to maintain, is provided as an embodiment of the present invention.

[0025] Figure 4 A top cross-sectional view of the connecting mechanism in the bucket of an electric shovel, which is easy to maintain, according to an embodiment of the present invention.

[0026] Figure 5 An exploded structural diagram of the connecting mechanism in the bucket of an easy-to-maintain electric shovel, provided as an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of the easy-to-maintain limit component in the bucket of an electric shovel, provided by an embodiment of the present invention;

[0028] Figure 7 A schematic diagram of the structure of the magnetic isolation component in the bucket of an electric shovel, which is easy to maintain, according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the control components in an easy-to-maintain electric shovel bucket according to an embodiment of the present invention. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure will be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0033] Furthermore, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0034] Example 1

[0035] Reference Figure 1-2 This embodiment provides an electric shovel bucket that is easy to maintain.

[0036] The easy-to-maintain electric shovel bucket includes a bucket mechanism 100 and a connecting mechanism 200.

[0037] Specifically, the bucket mechanism 100 includes a hollow bucket body 101 with an opening at the front. Connecting seats 102 are fixedly installed on both sides of the top plate of the bucket body 101. A connecting plate 103 is embedded in the inner side of the connecting seat 102. At the same time, a baffle 104 is integrally connected to the lower part of the connecting plate 103. Furthermore, a number of reinforcing ribs 105 are evenly distributed on the outer side of the bucket body 101.

[0038] The connecting mechanism 200 includes an outer cylinder 201 disposed on the outside of the connecting seat 102. A mounting seat 202 is fixedly disposed on the lower part of the outer cylinder 201. The outer cylinder 201 can be fixed to the top of the bucket body 101 through the mounting seat 202. A pin connecting rod 203 passes through the inside of the outer cylinder 201, and the pin connecting rod 203 is distributed on both sides of the outer cylinder 201.

[0039] Furthermore, the pin rod 203 passes through the internal through hole of the connecting seat 102 and the connecting plate 103, allowing the connecting seat 102 and the connecting plate 103 to rotate relative to each other, thereby allowing the baffle 104 to rotate open and close, controlling the opening and closing of the bucket body 101.

[0040] Two sets of reinforcing ribs 105 are provided on both sides of the outer wall of the bucket body 101. The reinforcing ribs 105 can improve the overall strength of the bucket body 101, so as to ensure the normal use of the bucket body 101 and reduce the deformation of the bucket body 101 caused by collision during long-term use.

[0041] Through the pin connection between the connecting seat 102, the connecting plate 103 and the pin connecting rod 203, the baffle 104 can be rotated around the pin connecting rod 203 with the support of the external bucket rod, so that the user can control the opening and closing of the bucket body 101 and ensure the scooping and transfer of ore by the bucket.

[0042] Example 2

[0043] Reference Figure 1-6 This is the second embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0044] The inner wall of the outer cylinder 201 is also provided with a disc-shaped support plate 201a, a fan-shaped limiting plate 201b and a fixing ring 201c in sequence from the outside to the inside.

[0045] The connecting mechanism 200 also includes a limiting member 204 disposed at the outer end of the inner side of the outer cylinder 201. The limiting member 204 is used to limit and fix the pin connecting rod 203. A cover 205 is provided on the outer periphery of the front end of the limiting member 204 to cooperate with it. A groove 203a is provided on the outer wall of the side of the pin connecting rod 203 located inside the outer cylinder 201 to cooperate with the limiting ball 204c.

[0046] Specifically, the limiting component 204 includes a slide 204a disposed inside the outer cylinder 201. The top of the slide 204a is inclined, and two grooves 204b are symmetrically provided on the top of the slide 204a. An elliptical limiting ball 204c is movably placed inside each groove 204b. A spring 204d is provided at the bottom of the slide 204a. The spring 204d is disposed between the support plate 201a and the slide 204a and can provide elastic support for the slide 204a. A push plate 204e is fixedly connected to the bottom plate surface of the slide 204a.

[0047] Furthermore, initially, when the pin 203 is not extended, the limiting ball 204c is located in the cavity formed by the slide 204a, the cover 205, and the outer wall of the pin 203. At this time, the spring 204d is in a compressed state. When the pin 203 extends and engages with the connecting seat 102 and the connecting plate 103, the outer slot 203a of the pin 203 moves between the slide 204a and the cover 205. At this time, the squeezing force on the limiting ball 204c from the pin 203 disappears, and the spring 204d... At this time, the slide block 204a can be pushed to slide and reset, so that the upper part of the limiting ball 204c can enter the slot 203a to limit and fix the extended pin rod 203. Through the cooperation of the limiting member 204, the cover 205 and the pin rod 203, the limiting member 204 can fix the pin rod 203 in the pin connection state, ensuring the stable connection and rotation of the connecting seat 102 and the connecting plate 103 under the action of the pin rod 203, and preventing the pin rod 203 from being displaced during use.

[0048] Example 3

[0049] Reference Figure 1-8 This is the third embodiment of the present invention, which is based on the previous embodiment and differs from the previous embodiment in that:

[0050] The connecting mechanism 200 also includes a magnet 206 fixedly disposed in the middle section of the inner wall of the outer cylinder 201. Both sides of the magnet 206 are provided with magnetic blocking elements 207, and the magnetic blocking elements 207 are disposed between the limiting element 204 and the magnet 206. A control element 208 is also connected to the outside of the magnetic blocking element 207, and the control element 208 is installed on the top of the cavity of the outer cylinder 201.

[0051] Specifically, the magnetic resisting component 207 includes an annular rotating plate 207a rotatably disposed along the outer edge of the fixed ring 201c. The surface of the rotating plate 207a has two guide grooves 207b arranged in annular array. At the same time, two movable plates 207c are provided outside the central through hole of the rotating plate 207a. The two movable plates 207c can close the central through hole of the rotating plate 207a. The bottom of the movable plate 207c is integrally provided with a guide post 207d that can cooperate with the guide groove 207b. Furthermore, guide plates 207e are provided on both sides of the movable plate 207c for limiting and guiding it. The guide plates 207e are fixed to the inner wall of the outer cylinder 201.

[0052] The control component 208 includes a lifting plate 208a movably mounted on the upper part of the cavity of the outer cylinder 201, and a push rod 208b is fixedly connected to the top of the lifting plate 208a. At the same time, hinge seats 208c are fixed on the bottom surfaces of both ends of the lifting plate 208a. A traction rod 208d is hinged to the lower part of the hinge seat 208c, and the lower end of the traction rod 208d is connected to the rotating plate 207a.

[0053] Preferably, the movable plate 207c is made of a high magnetic susceptibility material. The push plate 204e, movable plate 207c, and magnet 206 all use the same magnetic poles. According to the principle of like poles repulsion, magnet 206 can generate a repulsive magnetic force on push plate 204e and movable plate 207c. When the two movable plates 207c are in contact and the rotating plate 207a is closed, because movable plate 207c is made of a high magnetic susceptibility material, the repulsive magnetic force generated by magnet 206 can only act on the surface of movable plate 207c. At this time, push plate 204e will not be affected by the magnetic force from magnet 206. However, when the two movable plates 207c separate and the rotating plate 207a is opened, the magnetic force of magnet 206 can pass through the magnetic blocking element 207 and directly act on the surface of push plate 204e, thereby pushing push plate 204e outward, causing the limiting ball 204c to disengage from the slot 203a, thus unlocking the pin connecting rod 203.

[0054] Furthermore, the guide groove 207b is set in a quarter-elliptical arc shape, and the guide post 207d on the back of the movable plate 207c can cooperate with the guide groove 207b and slide along its path inside it. When the rotating plate 207a rotates, the two movable plates 207c can move outward under the limitation of the guide plate 207e and the guidance of the guide groove 207b on the guide post 207d, so as to expand the two movable plates 207c and open the central through hole of the rotating plate 207a, thereby ensuring that the magnetic force of the magnet 206 can be smoothly applied to the surface of the push plate 204e.

[0055] The two ends of the traction rod 208d are hinged to the lifting plate 208a and the rotating plate 207a respectively. At the same time, the traction rod 208d is inclined off the center line of the rotating plate 207a. When the push rod 208b pushes the lifting plate 208a down (the push rod 208b can be a commonly available hydraulic push rod), the traction rod 208d deflects around the hinge point of the rotating plate 207a and pushes the rotating plate 207a to rotate, so that the rotating plate 207a and the lifting plate 208a are linked. Then, the rotation of the rotating plate 207a causes the movable plate 207c to expand outward, so as to open the central through hole of the rotating plate 207a.

[0056] In practical use, when the user needs to unlock and retract the pin 203, the push rod 208b can be controlled to push the lifting plate 208a downward. At this time, the traction rod 208d moves synchronously with it, and then the eccentric setting of the traction rod 208d pushes the rotating plate 207a to rotate. At this time, the guide groove 207b is angularly offset, which can guide the guide post 207d to slide relatively inside it, so that the movable plate 207c moves outward under the limiting and guiding action of the guide plate 207e. At this time, the central through hole of the rotating plate 207a is in the open state, and the magnetic force of the magnet 206 can directly act on the push plate 204e. The push plate 204e is pushed by the repulsive magnetic force from the magnet 206 to push the slide 204a to compress the spring 204d, so that the slide 204a... When the slide block 204a moves outward, the cavity between the slide block 204a and the cover 205 increases, and the limiting ball 204c is no longer restricted. That is, the limiting ball 204c can move away from the slot 203a, and the engagement between the limiting ball 204c and the slot 203a is released. At this time, the pin rod 203 can be pushed inward. Through the cooperation between the limiting component 204, the magnet 206, the magnetic blocking component 207, and the control component 208, the locking and unlocking of the pin rod 203 is controlled by the transmission of the repulsive magnetic force of the magnet 206. This makes it convenient for the pin rod 203 to extend and retract, and allows the user to remove the baffle 104 or the connecting mechanism 200 as a whole for maintenance. This reduces the overall difficulty of maintenance operations and ensures the stable use of the electric shovel bucket.

[0057] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0058] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0059] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An easy-to-maintain electric shovel bucket, characterized in that: include, The bucket mechanism (100) includes a bucket body (101), a connecting seat (102) located at the top of the bucket body (101), a connecting plate (103) located inside the connecting seat (102), a baffle (104) located at the lower part of the connecting plate (103), and a reinforcing rib (105) located outside the bucket body (101); and, The connecting mechanism (200) includes an outer cylinder (201) disposed outside the connecting seat (102), a mounting seat (202) disposed at the lower part of the outer cylinder (201), a pin rod (203) passing through the interior of the outer cylinder (201), a limiting member (204) disposed on the outer side of the pin rod (203), a cover (205) disposed on the outer side of the limiting member (204), a magnet (206) disposed in the middle section of the inner wall of the outer cylinder (201), a magnetic blocking member (207) disposed on the outer side of the magnet (206), and a control member (208) disposed on the outer side of the magnetic blocking member (207). The limiting member (204) includes a slide (204a) disposed inside the outer cylinder (201), the top of the slide (204a) is provided with a groove (204b), the inside of the groove (204b) is provided with a limiting ball (204c), the bottom of the slide (204a) is provided with a spring (204d), and the top of the slide (204a) is provided with a push plate (204e). The magnetic blocking component (207) includes a rotating plate (207a) located between the push plate (204e) and the magnet (206). The surface of the rotating plate (207a) is provided with a guide groove (207b). A movable plate (207c) is provided on the outer side of the rotating plate (207a). A guide post (207d) is provided at the bottom of the movable plate (207c). A guide plate (207e) is provided on the outer side of the movable plate (207c). The control component (208) includes a lifting plate (208a) disposed on the upper part of the outer cylinder (201), a push rod (208b) disposed on the top of the lifting plate (208a), a hinge seat (208c) disposed on the bottom of the lifting plate (208a), a traction rod (208d) connected to the lower part of the hinge seat (208c), and the lower end of the traction rod (208d) is connected to the rotating plate (207a).

2. The easy-to-maintain electric shovel bucket according to claim 1, characterized in that: The baffle (104) is rotatably connected to the bucket body (101), and the baffle (104) and the bucket body (101) cooperate with each other.

3. The easy-to-maintain electric shovel bucket according to claim 1 or 2, characterized in that: The inner wall of the outer cylinder (201) is also sequentially fixed with a support plate (201a), a limiting plate (201b), and a fixing ring (201c).

4. The easy-to-maintain electric shovel bucket according to claim 3, characterized in that: The limiting ball (204c) is elliptical in shape, and there are two limiting balls (204c) symmetrically arranged about the axis of the slide (204a).

5. The easy-to-maintain electric shovel bucket according to claim 1 or 4, characterized in that: The pin rod (203) has a groove (203a) on one side of the outer wall inside the outer cylinder (201) that cooperates with the limiting ball (204c).

6. The easy-to-maintain electric shovel bucket according to claim 5, characterized in that: The push plate (204e), the movable plate (207c), and the magnet (206) are all equipped with the same magnetic poles.

7. The easy-to-maintain electric shovel bucket according to claim 4, characterized in that: The inner edge of the rotating plate (207a) is provided with a rolling groove that cooperates with the fixed ring (201c), and the rotating plate (207a) and the outer cylinder (201) are rotatably connected.

8. The easy-to-maintain electric shovel bucket according to claim 7, characterized in that: The guide groove (207b) is set in a quarter-elliptical arc shape, and the guide post (207d) and the guide groove (207b) form a sliding structure.

9. The easy-to-maintain electric shovel bucket according to claim 8, characterized in that: The guide plate (207e) is symmetrically arranged about the movable plate (207c), and both ends of the guide plate (207e) are fixed to the inner wall of the outer cylinder (201).

10. The easy-to-maintain electric shovel bucket according to claim 1 or 6, characterized in that: The rotating plate (207a) and the lifting plate (208a) form a linkage structure through the traction rod (208d), and the two ends of the traction rod (208d) are respectively hinged to the lifting plate (208a) and the rotating plate (207a).