Cable rotating support and electric excavator

Abstract

The application provides a cable rotating support and an electric excavator. The cable rotating support comprises a rotating support assembly, a base and a wire rack assembly. The rotating support assembly is arranged on a machine body of the electric excavator. The base is fixed to the rotating support assembly and rotates relative to the machine body through the rotating support assembly. The wire rack assembly is arranged on the base and fixes a power cable. Through the structure design that the rotating support assembly is connected with the machine body in a rotating mode, the rotating resistance and the instantaneous impact force of the power cable during the rotating operation are effectively reduced, the risk of kinking and breaking of the power cable is reduced, and the service life and safety of the power cable are improved.

Description

Technical Field

[0001] This application relates to the technical field of engineering machinery, and more particularly to a cable rotating bracket and an electric excavator. Background Technology

[0002] An excavator is an earthmoving machine that uses its bucket to dig materials above or below the machine's bearing surface and load them into transport vehicles or unload them into a stockpile. With increasing environmental protection requirements and the development of new energy technologies, traditional fuel-powered excavators are gradually transitioning to electric power. Electric excavators use batteries as their power source and connect to an external power source via a power cable to achieve a simultaneous charging and operating mode. This operating method places higher demands on the fixation and protection of the power cable. The cable puller frame of the electric excavator, as a key component, plays a crucial role in providing support and protection against breakage of the power cable.

[0003] Existing electric excavator cable pullers mainly consist of a base, a column, and a cable-carrying rod. The base is fixedly connected to the excavator body, the column is vertically mounted on the base, and the cable-carrying rod is connected to the column via a hinge mechanism. In this traditional structure, the cable-carrying rod typically uses a pivot-type hinge design, including a pivot parallel to the column and fixed plates on both sides of the column. The two ends of the pivot and the fixed plates form a rotating pair, and one end of the cable-carrying rod is fixedly connected to the pivot. This structure has significant drawbacks in practical use: First, the pivot-type hinge requires a large driving force to achieve rotation, resulting in the power cable bearing a large tensile force during excavator rotation; second, due to the high rotational resistance, the power cable is prone to kinking during frequent rotational movements; finally, when the excavator rotates rapidly or stops suddenly, the power cable is subjected to a large instantaneous impact force, which can easily cause the power cable to break.

[0004] Therefore, there is an urgent need for a cable swivel bracket and an electric excavator that can prevent the power cable from getting tangled or breaking due to large instantaneous tensile forces during excavator operation. Utility Model Content

[0005] This application provides a cable rotating bracket and an electric excavator, which can prevent the power cable from getting tangled or breaking due to large instantaneous tensile forces during excavator operation.

[0006] Firstly, this application provides a cable rotation bracket, the technical solution of which includes:

[0007] A slewing bearing assembly, wherein the slewing bearing assembly is disposed on the body of the electric excavator;

[0008] A base, which is disposed on the rotary support assembly and rotates relative to the machine body through the rotary support assembly;

[0009] A cable tray assembly is fixedly mounted on the base and is used to fix the power cable.

[0010] In one possible implementation, the slewing support assembly is a slewing bearing, with the outer ring of the slewing bearing fixed to the machine body and the inner ring fixedly connected to the base.

[0011] In one possible implementation, the cable tray assembly is provided with a mounting plate, and the mounting plate is provided with a wire clamp for securing the power cable.

[0012] In one possible implementation, the wireframe assembly includes:

[0013] A column, which is fixedly mounted on the base;

[0014] A cable-lifting rod is used to fix the power cable, and the cable-lifting rod is fixedly installed on the column.

[0015] In one possible implementation, four mounting plates are provided, namely a first mounting plate, a second mounting plate, a third mounting plate, and a fourth mounting plate. The first mounting plate is fixedly mounted on the base, the second mounting plate is fixedly mounted on the top of the column, the third mounting plate is fixedly mounted on the upper part of the line-lifting rod, and the fourth mounting plate is fixedly mounted on the end of the line-lifting rod away from the column.

[0016] In one possible implementation, the central axes of the first mounting plate, the second mounting plate, the third mounting plate, and the fourth mounting plate are located in the same vertical plane.

[0017] In one possible implementation, the height of the front end of the line-fetching lever along the first direction is higher than the height of the rear end.

[0018] In one possible implementation, the base is provided with reinforcing ribs, which are fixedly connected to the column and the line-lifting rod.

[0019] In one possible implementation, a limiting block is fixedly provided on the base, and a limiting block is fixedly provided on the body, the limiting block being used to limit the rotation angle of the limiting block.

[0020] Secondly, this application also provides an electric excavator, comprising:

[0021] Organism;

[0022] A cable reel, on which a power cable is mounted;

[0023] The aforementioned cable rotating bracket has a rotating support assembly rotatably mounted on the machine body, and a cable frame assembly that fixes the power cable.

[0024] The cable rotation bracket and electric excavator provided in this application have a structural design in which the base is rotatably connected to the machine body through a slewing support assembly. This design effectively reduces the rotational resistance and instantaneous impact force of the power cable during slewing operations, reduces the risk of power cable kinking and breakage, and has the advantages of improving the service life and safety of the power cable. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 This is a schematic diagram of the overall structure of the cable rotating bracket provided in this application.

[0027] Reference numerals in the attached drawings: 1. Base; 2. Slewing bearing; 3. Column; 4. Line-lifting rod; 5. Reinforcing rib; 6. Limiting block; 7. First mounting plate; 8. Second mounting plate; 9. Third mounting plate; 10. Fourth mounting plate.

[0028] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0030] In related technologies, the electrification of excavators often faces the technical challenge of power cable breakage and kinking. Traditional cable pullers use a hinged shaft structure, which has high rotational resistance, causing the power cable to bear large instantaneous tensile forces. This easily leads to the power cable becoming tangled and knotted during the slewing operation of the electric excavator. For example, in mining operations, frequent equipment turning causes the power cable to be repeatedly subjected to torsional stress, and the rotational lag of the traditional hinged structure exacerbates the risk of fatigue fracture of the power cable.

[0031] Therefore, this application reduces the additional load during the power cable traction process by using a rotary structure instead of a traditional hinge.

[0032] This application proposes a cable slewing bracket comprising a slewing support assembly, a base, and a cable tray assembly. The cable slewing bracket of this application is rotatably connected to the body of an electric excavator via the slewing support assembly. It is typically installed on the slewing platform of a power-assisted electric excavator. The slewing support assembly is rotatably connected to the electric excavator body, the base is fixed to the slewing support assembly, and the cable tray assembly is mounted on the base and secures the power cable. The power cable is led out from the power interface of the electric excavator body and sequentially fixed to the slewing support assembly and the cable tray assembly before connecting to the electrical equipment. This structural design, through the rotatable connection between the slewing support assembly and the excavator body, effectively reduces the rotational resistance and instantaneous impact force of the power cable during slewing operations, reduces the risk of power cable kinking and breakage, and has the advantages of improving the service life and safety of the power cable.

[0033] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Reference Figure 1 The cable swivel bracket proposed in this application includes a swivel support assembly, a base 1, and a cable frame assembly. The swivel support assembly is mounted on the body of the electric excavator, the base 1 is fixed to the swivel support assembly and rotates relative to the body through the swivel support assembly, and the cable frame assembly is mounted on the base 1 and fixes the power cable.

[0035] The slewing support assembly is used to enable relative rotation between the base 1 and the machine body. The base 1 is used to support the wire frame assembly and form a stable support foundation. The wire frame assembly is used to constrain the path of the power cable and prevent the power cable from getting tangled.

[0036] Specifically, the slewing support assembly replaces the sliding friction of the traditional hinge with rolling friction, which significantly reduces the rotational resistance of the base 1 when it rotates with the electric excavator. When the electric excavator turns, the low resistance of the slewing support assembly causes the cable rotation bracket to adjust accordingly, and the torsional stress on the power cable is decomposed into multiple flexible deformations, avoiding localized concentrated tension.

[0037] Compared to existing technologies, traditional articulated shafts need to overcome rotational resistance generated by sliding friction, resulting in additional tension on the power cable. This application reduces friction by employing a slewing bearing assembly structure, significantly decreasing the traction force on the power cable. Simultaneously, the slewing bearing assembly has a greater axial load capacity than the articulated structure, making it suitable for the operating loads of heavy-duty electric excavators.

[0038] Through the above technical solution, this application effectively reduces the instantaneous tensile force on the power cable when the equipment turns, and avoids power cable kinking caused by rotational lag. The low resistance characteristics of the slewing support assembly allow the cable rotation bracket to follow the equipment's rotation in real time, keeping the power cable bending radius stable and preventing insulation damage caused by local bending.

[0039] In some embodiments, the slewing support assembly is a slewing bearing 2, the outer ring of the slewing bearing 2 is fixed to the machine body, the inner ring of the slewing bearing 2 is fixedly connected to the base 1, and the outer ring and the inner ring of the slewing bearing 2 are rotatably connected.

[0040] Among them, slewing bearing 2 refers to a bearing structure capable of withstanding axial loads, radial loads, and overturning moments. It has an inner ring, an outer ring, and rolling elements, and is a large bearing capable of withstanding comprehensive loads, simultaneously bearing large axial and radial loads and overturning moments. Specifically, slewing bearing 2 can be a slewing bearing 2 with raceways and rolling elements.

[0041] The outer ring of the slewing bearing 2 is fixed to the machine body, forming a rigid connection between the outer ring of the slewing bearing 2 and the machine body of the electric excavator. Specifically, a flange can be installed between the outer ring of the slewing bearing 2 and the machine body, and bolts can be used for fixing, so that the outer ring remains stationary relative to the machine body when the machine body rotates. The inner ring of the slewing bearing 2 is fixedly connected to the base 1, forming a synchronous rotation structure between the inner ring of the slewing bearing 2 and the base 1 of the cable swivel bracket. Specifically, this can be achieved by welding or bolting, allowing the base 1 to rotate relative to the outer ring of the slewing bearing 2 along with the inner ring of the slewing bearing 2.

[0042] Specifically, the slewing bearing 2 forms a stable relative rotational support structure through the fixing of the outer ring to the machine body and the connection of the inner ring to the base 1. When the electric excavator body rotates, the base 1 rotates with the inner ring relative to the outer ring, causing the cable frame assembly to rotate synchronously. The rolling elements inside the slewing bearing 2 roll within the raceway, replacing the sliding friction of the traditional hinged structure. This conversion from sliding friction to rolling friction reduces rotational resistance, allowing the cable slewing bracket to flexibly adjust the cable position in accordance with the electric excavator's rotation.

[0043] Compared with related technologies, the existing technology uses a hinged shaft structure, which has sliding friction between the shaft and the fixed plate. This results in greater resistance during rotation, causing the cable to bear additional tension. In contrast, this application uses a slewing bearing 2 structure, which reduces rotational resistance through rolling friction, making the cable rotating bracket rotate more smoothly and avoiding excessive pulling of the power cable due to rotational lag.

[0044] Through the above technical solution, this application can reduce the instantaneous tension on the power cable when the cable rotating bracket rotates, prevent the cable from getting tangled or broken due to excessive rotational resistance, and at the same time, through the stable bearing characteristics of the slewing bearing 2, ensure the structural reliability of the cable rotating bracket under the frequent slewing conditions of the electric excavator.

[0045] In some embodiments, the wire frame assembly is provided with a mounting plate, and the mounting plate is provided with wire clamps for fixing power cables.

[0046] The mounting plate is fixed to the wire frame assembly. Specifically, the mounting plate can be made of metal sheet and fixed to the base 1 or column 3 by welding or bolting, providing a mounting base for the wire clamps. The wire clamps are used to hold the power cables. Specifically, they can be plastic or metal clamps with elastic clamping grooves, fixed to the mounting plate by bolts or clips, to limit cable displacement and distribute tension, further reducing stress concentration.

[0047] Specifically, mounting plates are fixed at different locations on the cable tray assembly, such as the base 1, the top of the column 3, or the end of the cable take-up bar 4. Cable clamps are arranged according to the distribution of the mounting plates. When the power cable passes through the clamps, the clamping grooves of the clamps provide multi-point restraint to the power cable, preventing it from slipping or twisting during the rotation or movement of the electric excavator. Because of the rigid connection between the cable clamps and the mounting plates, the tensile force on the power cable is evenly transmitted to the support structure of the cable tray assembly, thereby reducing localized stress concentration.

[0048] Compared to related technologies, existing technologies use a hinged pivot structure for the cable take-up lever 4 to rotate, and the cable is fixed by a single hinge point, which can easily lead to the power cable bearing additional tension due to high rotational resistance. In contrast, this application uses a distributed fixing method with mounting plates and cable clamps, which can achieve stable constraint of the power cable without relying on a hinged structure, while reducing the frictional resistance caused by rotating parts.

[0049] Through the above technical solution, this application can effectively disperse the instantaneous tensile force on the power cable during the operation of the electric excavator, avoid the power cable from breaking due to excessive local stress, and at the same time reduce the risk of twisting and knotting of the power cable during rotation by fixing it at multiple points.

[0050] In some embodiments, the cable tray assembly includes a column 3 and a cable lifter 4. The column 3 is fixedly mounted on the base 1, and the cable lifter 4 is used to fix the power cable and is fixedly mounted on the column 3.

[0051] The column 3 is vertically mounted on the base 1 and can be fixed to the base 1 by welding or bolting, so as to provide a vertical bearing foundation for the line-lifting rod 4.

[0052] The cable guide rod 4 is installed on the support rod in a horizontal or inclined direction. Specifically, it can be a tubular or channel steel structure and is fixed to the column 3 by welding or flange connection. It is used to form a guide path for the cable along the extension direction.

[0053] Specifically, the column 3 is vertically fixed to the surface of the base 1, with its axis perpendicular to the plane of the base 1. The lifting rod 4 is horizontally fixed to the top or side of the column 3, forming a rigidly connected integral structure. The power cable is constrained along the extension path of the lifting rod 4. When the electric excavator rotates, the power cable forms a smooth bend through the guiding action of the lifting rod 4, avoiding local stress concentration caused by sudden turning.

[0054] Compared with related technologies, the existing technology uses a hinged shaft structure to allow the line-lifting rod 4 to rotate. However, during the rotation, the power cable needs to overcome the frictional resistance of the shaft, which can easily cause jamming and increase the instantaneous tension. This application eliminates the frictional loss caused by the rotating pair by rigidly fixing the line-lifting rod 4 to the column 3. This allows the power cable to adapt to the smooth deformation of the fixed trajectory of the line-lifting rod 4 when the electric excavator rotates, which significantly reduces the instantaneous tension.

[0055] Through the above technical solution, this application effectively avoids the instantaneous change in tensile force of the power cable caused by the frictional resistance of the rotating mechanism. The fixed guide structure makes the bending deformation of the power cable evenly distributed, preventing the risk of breakage caused by excessive local stress. At the same time, it eliminates the cable swing caused by the gap of the rotating pair and reduces the phenomenon of tangling and knotting.

[0056] In some embodiments, four mounting plates are provided, namely a first mounting plate 7, a second mounting plate 8, a third mounting plate 9, and a fourth mounting plate 10. The first mounting plate 7 is fixedly mounted on the base 1, the second mounting plate 8 is fixedly mounted on the top of the column 3, the third mounting plate 9 is fixedly mounted on the upper part of the line-lifting rod 4, and the fourth mounting plate 10 is fixedly mounted on the end of the line-lifting rod 4 away from the column 3.

[0057] The first mounting plate 7 is located at the connection between the base 1 and the column 3, and can be achieved by welding or bolting. It is used to distribute the load transmitted from the column 3 to the base 1. The second mounting plate 8 is located at the top of the column 3, and can be achieved through a flange structure. It is used to bear the weight of the power cable transmitted by the lifting rod 4. The third mounting plate 9 is located in the middle section of the lifting rod 4, and can be achieved through a U-shaped groove structure. It is used to restrain the lateral displacement of the power cable in the movement trajectory of the lifting rod 4. The fourth mounting plate 10 is located at the free end of the lifting rod 4, and can be achieved through a clamping mechanism with a buffer pad. It is used to eliminate the instantaneous tension at the end of the power cable caused by the rotation of the electric excavator.

[0058] Specifically, a first mounting plate 7 is installed at the connection between the base 1 and the column 3, a second mounting plate 8 is installed at the top of the column 3, a third mounting plate 9 is installed in the middle of the cable-laying rod 4, and a fourth mounting plate 10 is installed at the end of the cable-laying rod 4. These four mounting plates form a stepped fixing structure along the power cable route. When the electric excavator rotates, the power cable bears the tension in different directions in stages through the four mounting plates. For example, the first mounting plate 7 bears the torsional stress between the base 1 and the machine body, the second mounting plate 8 absorbs the bending moment at the top of the column 3, the third mounting plate 9 suppresses the swing amplitude of the power cable, and the fourth mounting plate 10 eliminates the end impact load through a buffer structure. This multi-stage fixing method ensures that the power cable remains in a segmented and controlled state throughout the 360-degree rotation of the electric excavator.

[0059] Compared to related technologies, existing technologies only have a single mounting point at the junction of the column 3 and the boom 4, which easily leads to concentrated stress in the power cable during rotation. This application uses four mounting plates to form multi-point constraints, decomposing the force on the power cable into four independent components: support from the base 1, load-bearing capacity from the column 3, guidance from the boom 4, and end-buffering. For example, when the boom 4 rises and falls with the boom of the electric excavator, the third mounting plate 9 can limit the sliding distance of the power cable on the boom 4, and the fourth mounting plate 10 absorbs the end impact through elastic elements, avoiding the power cable breakage caused by single-point stress in traditional structures.

[0060] Through the above technical solution, this application effectively solves the problem of stress concentration in power cables under complex working conditions. The multi-level fixing structure formed by the four mounting plates ensures that the power cable is always in a segmented and controlled state during the rotation and lifting of the electric excavator. This avoids kinking of the power cable due to excessive swing amplitude and prevents local stress from exceeding the power cable's bearing limit by dispersing tension in stages. In particular, the buffer design of the fourth mounting plate 10 can eliminate the instantaneous impact load generated when the electric excavator stops suddenly or turns abruptly, significantly improving the service life of the power cable.

[0061] In some embodiments, the central axes of the first mounting plate 7, the second mounting plate 8, the third mounting plate 9, and the fourth mounting plate 10 are located in the same vertical plane.

[0062] The centerline refers to the center line of the mounting plate along its length, which can be achieved using laser positioning or mechanical calibration to ensure the spatial relationship between the mounting plates. The vertical plane refers to a virtual plane perpendicular to the horizontal plane, which can be calibrated using measuring instruments to ensure the verticality of the mounting plates and to constrain the trajectory of the power cables.

[0063] Specifically, four mounting plates are fixed to the base 1, the top of the column 3, the upper part of the cable lift 4, and the end of the cable lift 4, respectively. When the central axes of each mounting plate are coplanar, the extension path of the power cable from the base 1 to the end of the cable lift 4 is constrained within the same vertical plane. During the slewing operation of the electric excavator, the power cable moves synchronously with the overall rotation of the cable slewing bracket. Because the spatial positions of each fixing point remain coplanar, the power cable only needs to bend and deform within a single plane, avoiding stress concentration caused by multi-plane twisting.

[0064] Compared to related technologies, the mounting plates of traditional hinged cable take-up levers 4 are distributed across multiple planes, causing spatial twisting of the power cable during movement. This application, by constraining the mounting plates to be coplanar, ensures that the power cable always moves within a single plane, effectively eliminating the additional stress caused by spatial twisting.

[0065] Through the above technical solution, this application can ensure that the fixing points of the power cable on the cable rotation bracket are aligned in a straight line. When the electric excavator rotates, the power cable only needs to be bent in a plane, avoiding local stress concentration caused by multi-dimensional twisting, thereby preventing the internal core of the power cable from breaking due to complex deformation.

[0066] In some embodiments, the height of the front end of the line-lifting lever 4 along the first direction is higher than the height of the rear end.

[0067] The cable-lifting rod 4 is used to fix the power cable. It can be made of welded metal tubing, and the cable is guided by an inclined angle design. The first direction refers to the length direction of the cable-lifting rod 4. The fact that the front end of the cable-lifting rod 4 is higher than the rear end in the first direction means that the cable-lifting rod 4 is inclined at the front and lower at the back when it is installed. Specifically, the connection between the cable-lifting rod 4 and the column 3 can be set as an inclined mounting surface, so that the cable can slide naturally along the inclined direction when it moves.

[0068] Specifically, the cable guide bar 4 is installed at an angle, creating a shape that is higher at the front and lower at the back. When the electric excavator rotates or moves, the power cable slides naturally along the inclined surface of the cable guide bar 4 under the influence of gravity. The inclined structure reduces the lateral resistance experienced by the power cable during its movement, while limiting the bending angle of the power cable to within the inclined plane. When the electric excavator suddenly turns or stops, the component force generated by the inclined structure can offset part of the instantaneous tension in the power cable, preventing the cable from bearing concentrated stress in one direction.

[0069] By replacing the rotating mechanism with a fixed inclined structure, the resistance caused by shaft friction is eliminated. Simultaneously, the force decomposition mechanism formed by the inclined surface actively counteracts the impact load on the power cable, effectively reducing the instantaneous tension on the power cable caused by sudden stops or turns during electric excavator operation, and preventing the power cable from breaking due to excessive stress at a single point. The inclined structure guides the power cable to slide along a predetermined path, preventing disorderly entanglement or kinking during movement, thus extending the service life of the power cable.

[0070] In some embodiments, a reinforcing rib 5 is provided on the base 1, and the reinforcing rib 5 is fixedly connected to the column 3 and the line-lifting rod 4.

[0071] Among them, the reinforcing rib 5 enhances the structural connection strength. Specifically, it can be formed by welding steel plates to form a triangular support structure, which serves to improve the connection rigidity between the base 1, the column 3, and the line-lifting rod 4.

[0072] Specifically, a triangular steel plate is welded to the upper surface of the base 1 to form a reinforcing rib 5. The two sides of this reinforcing rib 5 are welded and fixed to the bottom side of the column 3 and the root side of the cable lift 4, respectively. When the power cable is subjected to tension, the reinforcing rib 5, through the triangular support structure, decomposes the tension into the vertical pressure of the column 3 and the lateral shear force of the base 1, preventing plastic deformation at the connection point. Simultaneously, the reinforcing rib 5, together with the base 1, column 3, and cable lift 4, forms a continuous, closed rigid frame, effectively suppressing the relative displacement of each component under dynamic loads.

[0073] Compared with related technologies, traditional structures without reinforcing ribs 5, where the column 3 and the cable-laying rod 4 are only connected by a single-point weld, are prone to stress concentration and weld cracking when the power cable swings frequently. This application adds reinforcing ribs 5 to form a multi-directional support system, making the load distribution more uniform and significantly reducing the stress peak at the connection points.

[0074] Through the above technical solution, this application effectively solves the problem of power cable breakage caused by the deformation of the cable rotation bracket structure when the power cable is under tension. By strengthening the connection strength between the base 1 and the column 3 and the line-lifting rod 4, the power cable can maintain a stable stress state when the electric excavator is rotating, and avoid instantaneous overload of the cable caused by structural loosening.

[0075] In some embodiments, a cable rotating bracket has a limiting block 6 fixedly disposed on a base 1 and a limiting block fixedly disposed on the body. The limiting block is used to limit the rotation angle of the limiting block 6.

[0076] The limiting block 6 is fixed to the base 1. It can be a metal block or a protruding structure. Its function is to cooperate with the limiting block to form a physical limit on the rotation angle. The limiting block is a constraint component fixed to the machine body. It can be a structure with grooves or baffles. Its function is to limit the maximum rotation range of the cable rotation bracket through the contact surface with the limiting block 6.

[0077] Specifically, when the electric excavator rotates, the base 1 rotates relative to the machine body along with the slewing support assembly, and the limit block 6 rotates synchronously with the base 1. When the limit block 6 moves to a preset contact position with the restricting block, the restricting block forcibly limits the rotation angle of the cable slewing bracket by blocking the continued rotation of the limit block 6. For example, the contact surface between the limit block 6 and the restricting block can be set to an arc or a plane. By adjusting the relative position of the two, the rotation angle can be controlled within a specific range.

[0078] In some specific embodiments, the limiting block 6 can be configured as a detachable structure, for example, fixed to the edge of the base 1 by bolts; the limiting block can be configured as a multi-position adjustable mounting plate, for example, with multiple mounting holes provided on the body, and the limiting angle can be changed by adjusting the mounting position. In addition, the contact surface between the limiting block 6 and the limiting block can be covered with a wear-resistant material, such as a rubber or polyurethane layer, to reduce mechanical wear.

[0079] This application uses the mechanical cooperation between the limit block 6 and the limiting block to directly limit the maximum rotation angle of the cable rotating bracket, thereby avoiding the risk of cable breakage due to excessive torsion or instantaneous tension. It can effectively control the rotation range of the cable rotating bracket, prevent the power cable from getting tangled or bearing tension beyond the design range due to angle accumulation during continuous rotation operation of the electric excavator, thereby reducing the probability of cable breakage and extending its service life.

[0080] In some embodiments, an electric excavator includes a body, a cable reel, and a cable swivel bracket. A power cable is provided on the cable reel, a swivel support assembly of the cable swivel bracket is rotatably mounted on the body, and a cable frame assembly fixes the power cable.

[0081] The cable reel is a winding device used to reel in and unwind power cables. Specifically, it can be a motor-driven drum structure that releases or retracts the power cable synchronously as the electric excavator moves.

[0082] Specifically, the slewing bearing assembly connects the base 1 to the machine body via the slewing bearing 2. When the electric excavator rotates, the base 1 rotates synchronously with the inner ring of the slewing bearing 2. The cable tray assembly is rigidly connected to the base 1 via the column 3, and the extension direction of the cable take-up lever 4 is consistent with the extension path of the power cable. After the power cable is led out from the reel, it passes through the clamps on each mounting plate of the cable tray assembly in sequence, forming a continuous constraint path. During the rotation of the electric excavator, the low-friction characteristics of the slewing bearing 2 allow the base 1 to rotate freely in the same direction as the machine body. Under the guidance of the clamps, the power cable only undergoes smooth bending deformation, avoiding local twisting. At the same time, the extension angle of the cable take-up lever 4 matches the natural sag of the cable, preventing additional tension on the suspended section due to gravity.

[0083] Compared to existing technologies, in the prior art, the cable-laying rod 4 is connected to the column 3 via a hinged shaft. When the cable rotates with the electric excavator, it must overcome the frictional resistance at the hinge, resulting in significant torsional stress on the cable. This application replaces the traditional hinged structure with a slewing bearing 2, achieving low-resistance rotation and eliminating the additional load on the power cable caused by shaft friction. Furthermore, the linear constraint path composed of multiple mounting plates, compared to a single-point fixed structure, can disperse the bending stress of the power cable, preventing the risk of breakage due to stress concentration.

[0084] Through the above technical solution, this application enables the power cable to rotate freely and synchronously with the cable rotation bracket during the slewing operation of the electric excavator, avoiding torsion or stretching of the power cable caused by relative displacement between the machine body rotation and the cable fixing point. The power cable maintains a smooth transition under the continuous constraint of the cable frame assembly, effectively eliminating local bending points and preventing breakage accidents caused by concentrated instantaneous tension, while also preventing the power cable from tangling and knotting during repeated torsion.

[0085] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A cable rotating bracket, characterized in that: include: A slewing bearing assembly, wherein the slewing bearing assembly is disposed on the body of the electric excavator; A base, which is disposed on the rotary support assembly and rotates relative to the machine body through the rotary support assembly; A cable tray assembly is fixedly mounted on the base and is used to fix power cables. The slewing support assembly is a slewing bearing, wherein the outer ring of the slewing bearing is fixed to the machine body, and the inner ring is fixedly connected to the base; The wireframe assembly includes: A column, which is fixedly mounted on the base; A cable-lifting rod is used to fix the power cable, and the cable-lifting rod is fixedly installed on the column.

2. The cable rotating bracket according to claim 1, characterized in that: The cable tray assembly is provided with a mounting plate, and the mounting plate is provided with a wire clamp for fixing the power cable.

3. A cable rotating bracket according to claim 2, characterized in that: The mounting plate is provided with four plates, namely a first mounting plate, a second mounting plate, a third mounting plate, and a fourth mounting plate. The first mounting plate is fixedly mounted on the base, the second mounting plate is fixedly mounted on the top of the column, the third mounting plate is fixedly mounted on the upper part of the line-lifting rod, and the fourth mounting plate is fixedly mounted on the end of the line-lifting rod away from the column.

4. A cable rotating bracket according to claim 3, characterized in that: The central axes of the first mounting plate, the second mounting plate, the third mounting plate, and the fourth mounting plate are located in the same vertical plane.

5. A cable rotating bracket according to any one of claims 2-4, characterized in that: The height of the front end of the line-lifting rod along the first direction is higher than the height of the rear end.

6. A cable rotating bracket according to any one of claims 2-4, characterized in that: The base is provided with reinforcing ribs, which are fixedly connected to the column and the line-lifting rod.

7. A cable rotating bracket according to any one of claims 2-4, characterized in that: A limit block is fixedly installed on the base, and a limiting block is fixedly installed on the body. The limiting block is used to limit the rotation angle of the limit block.

8. An electric excavator, characterized in that: include: Organism; A cable reel, on which a power cable is mounted; The cable rotating bracket according to any one of claims 1-7, wherein the rotating support assembly of the cable rotating bracket is rotatably disposed on the machine body, and the cable frame assembly of the cable rotating bracket fixes the power cable.

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