Spanner arm, box spanner and anode lifting device
By employing guide wheels for both the fixed and movable arms in the small box clamp wrench, sliding friction is transformed into rolling friction, solving the problem of severe wear on the wrench arm and achieving a long service life and efficient and stable operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUNNAN YONGXIN ALUMINUM
- Filing Date
- 2025-04-28
- Publication Date
- 2026-07-14
AI Technical Summary
The existing small box clamp wrench has a short service life due to the sliding friction mechanism, which causes severe wear of the components and affects the stability of equipment maintenance and production operations.
The design incorporates a fixed arm and a movable arm. The movable arm achieves telescopic movement through guide wheels and a drive unit. The guide wheels convert sliding friction into rolling friction, reducing wear. Combined with a hydraulic motor-driven torsion mechanism, it improves operating efficiency and stability.
It extends the service life of the wrench arm, reduces equipment maintenance costs, improves the continuity and stability of production operations, and ensures the accuracy and efficiency of the small box clamp wrench.
Smart Images
Figure CN224488973U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of aluminum electrolysis crab equipment, and particularly relates to a wrench arm, a small box clamp wrench and an anode lifting device. BACKGROUND
[0002] The crab is the core equipment of an aluminum electrolysis workshop and is mainly responsible for anode replacement operation of an electrolytic cell bus. In an electrolytic cell system of the aluminum electrolysis workshop, an anode is usually fixed on the electrolytic cell bus through a small box clamp. During the anode replacement process, the small box clamp wrench on the crab is used to complete the dismounting and mounting operation of the small box clamp.
[0003] The current small box clamp wrench adopts a telescopic structure design based on sliding friction for the wrench arm. Although the structure can meet diversified operation requirements through arm length adjustment, due to the inherent characteristics of the sliding friction mechanism, component wear is easily caused, thereby significantly shortening the service life of the wrench and bringing challenges to equipment maintenance and production operation. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the application provides a wrench arm, a small box clamp wrench and an anode lifting device, and the main purpose is to reduce friction loss in the telescopic process of the movable arm and improve the service life of the equipment.
[0005] To achieve the above purpose, the application mainly provides the following technical solutions:
[0006] In a first aspect, the application provides a wrench arm, which comprises:
[0007] A fixed arm, which is a hollow structure with at least one open end, and a plurality of guide wheels are rotatably arranged on the opposite side walls of the fixed arm along the length direction of the fixed arm;
[0008] A movable arm, which is movably arranged in the fixed arm and in contact with the guide wheels;
[0009] A driving part, which is arranged on the fixed arm and connected with the movable arm, and is used to drive the movable arm to make telescopic movement in the fixed arm.
[0010] Optionally, the opposite side walls of the fixed arm on which the guide wheels are arranged are a group.
[0011] Optionally, a groove is arranged around the outer edge of the guide wheel.
[0012] A guide strip is arranged on the movable arm at a position corresponding to the guide wheel, and the guide strip extends along the length direction of the movable arm.
[0013] When the driving part drives the movable arm to do the telescopic movement in the fixed arm, the guide strips are embedded in the grooves of the guide wheels and roll in the grooves along with the movement of the movable arm.
[0014] Optionally, the movable arm is a channel steel, and the guide strips are arranged on two opposite outer walls of the channel steel respectively and extend along the length direction of the channel steel.
[0015] Optionally, a plurality of reinforcing ribs are arranged on the web of the channel steel at intervals and extend along the width direction of the channel steel.
[0016] Optionally, the driving part is a hydraulic oil cylinder, which is arranged on the outer side of the fixed arm and located on the side close to the equipment operation channel.
[0017] Optionally, the wrench arm further comprises:
[0018] a connecting part arranged on one end of the fixed arm away from the open end thereof.
[0019] In a second aspect of the present application, a small box clamp wrench is provided, comprising:
[0020] the wrench arm as claimed in any one of the above;
[0021] a twisting mechanism arranged on one end of the movable arm away from the fixed arm, and used for tightening and loosening the small box clamp.
[0022] Optionally, the small box clamp wrench further comprises:
[0023] a hydraulic motor directly connected with the twisting mechanism.
[0024] In a third aspect of the present application, an anode lifting device is provided, comprising:
[0025] the small box clamp wrench as claimed in the above;
[0026] a lifting machine arm fixedly arranged on a crown block and connected with the small box clamp wrench.
[0027] By means of the above technical solutions, the present application has at least the following beneficial effects:
[0028] The wrench arm, the small box clamp wrench and the anode lifting device provided in the embodiments of the present application, the movable arm can move in the fixed arm, the movable arm is driven to do the extension and retraction movement through the driving part, and the extension length of the wrench arm can be flexibly adjusted according to the operation requirement. When the small box clamp in the electrolytic cell is operated, the wrench arm can be extended outward, so that the operation part can accurately touch the target position; in the equipment moving or non-working state, the wrench arm can be retracted, the space occupation is reduced, and the flexibility and safety of the equipment operation are improved. On this basis, a plurality of guide wheels are rotatably arranged on the opposite side walls of the fixed arm along the length direction, and the movable arm is in contact with the guide wheels. The guide wheels can play a good guiding role on the movable arm, ensure that the movable arm stably does the extension and retraction movement in the fixed arm, avoid the deviation, shaking or jamming of the movable arm in the extension and retraction process, improve the stability and reliability of the extension and retraction action of the wrench arm, and further ensure the accuracy and efficiency of the small box clamp wrench in the operation process. In addition, through the mode that the guide wheels support and guide the movement of the movable arm, the rolling friction is formed, the direct friction between the movable arm and the fixed arm can be effectively reduced, the wear degree of the parts is reduced, the service life of the wrench arm is significantly prolonged, the equipment maintenance cost is reduced, and the continuity and stability of the production operation are improved. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 The structure schematic view of the wrench arm of an optional embodiment of the present application is shown in the figure.
[0030] Figure 2 The structure schematic view of the small box clamp wrench of an optional embodiment of the present application is shown in the figure. Figure 1 The enlarged view of A in the figure.
[0031] Figure 3 The structure schematic view of the small box clamp wrench of an optional embodiment of the present application is shown in the figure.
[0032] The signs are represented as follows:
[0033] 1, fixed arm; 2, movable arm; 3, driving part; 4, guide wheel; 41, groove; 5, connecting part; 6, twisting mechanism; 7, hydraulic motor. DETAILED DESCRIPTION
[0034] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0037] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0038] See also Figures 1 to 3 As shown, an embodiment of the first aspect of this application provides a wrench arm; an embodiment of the second aspect of this application provides a small box clamp wrench; and an embodiment of the third aspect of this application provides an anode lifting device.
[0039] Among them, the wrench arm is applied to the small box clamp wrench, which is used to operate the small box clamp.
[0040] Specifically, the small box clamp wrench, in addition to the wrench arm, also includes a torsion mechanism 6. The torsion mechanism 6 is connected to the lower end of the wrench arm and moves with the lifting and lowering of the wrench arm. It consists of a sleeve and a fixing plate. The sleeve can be fitted onto the screw of the small box clamp and rotated. By changing the direction of rotation, the small box clamp can be loosened or tightened. The fixing plate is used to hold the small box clamp, ensuring stability during operation. Furthermore, the small box clamp wrench is equipped with a hydraulic motor 7, which is directly connected to the sleeve. The hydraulic motor 7 outputs power to drive the sleeve to rotate, thereby efficiently completing the loosening and tightening operations of the small box clamp. Here, the direct connection between the hydraulic motor 7 and the sleeve reduces intermediate transmission links, maximizing the transmission of power from the hydraulic motor 7 to the sleeve, reducing power loss, improving transmission efficiency, and making the loosening and tightening operations of the small box clamp faster and more powerful. At the same time, the simplified mechanical structure reduces the shaking and instability caused by the fit clearance between multiple transmission components, making the entire driving process more stable, extending the service life of the small box clamp wrench, and reducing maintenance costs.
[0041] In practical applications such as aluminum electrolysis workshops, the small clamp box serves to securely install the anode onto the electrolytic cell busbar. The small clamp box wrench, by manipulating the clamp box, enables the disassembly and installation of the clamp box, thereby achieving the goal of replacing the anode on the electrolytic cell busbar. Furthermore, in the anode replacement process, the anode lifting device is an indispensable piece of equipment. The small clamp box wrench, as a component of the anode lifting device, works in tandem with the clamp box wrench to complete the anode replacement task.
[0042] Specifically, the anode lifting device includes a small box clamp wrench and a lifting arm. The lifting arm, as the basic load-bearing structure, is mounted on a crane, allowing it to move flexibly above each electrolytic cell thanks to the crane's mobility. Simultaneously, the lifting arm extends towards the electrolytic cell, precisely reaching the anode replacement work area and creating space for subsequent operations. The wrench arm is mounted on the lifting arm using a telescopic connection, allowing for flexible adjustment of its extension length according to operational needs: when operating the small box clamp within the electrolytic cell, the wrench arm can extend outwards, exceeding the boundary of the lifting arm to ensure the working component accurately reaches the target position; when the equipment is moving or not in operation, the wrench arm can retract, effectively reducing space occupation and improving the flexibility and safety of equipment operation. A torsion mechanism 6 is located at the end of the wrench arm furthest from the lifting arm. During the anode replacement process, the torsion mechanism 6, through a sleeve tightly engaging with the screw on the small box clamp, uses the power provided by the hydraulic motor 7 to drive the sleeve to rotate, thereby loosening or tightening the small box clamp. When the anode needs to be replaced, the torsion mechanism 6 performs a loosening operation to release the fixed connection between the anode and the electrolytic cell busbar; after the new anode is in place, the torsion mechanism 6 is used again to tighten it, firmly fixing the anode to the busbar and ensuring the stable operation of electrolysis.
[0043] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the wrench arm includes a fixed arm 1, a movable arm 2, and a drive unit 3; the fixed arm 1 is a hollow structure with at least one open end, and multiple guide wheels 4 are rotatably arranged on the opposite side wall of the fixed arm 1 along the length direction of the fixed arm 1; the movable arm 2 is movably arranged inside the fixed arm 1, and the movable arm 2 is in contact with the guide wheels 4; the drive unit 3 is arranged on the fixed arm 1 and connected to the movable arm 2, and the drive unit 3 is used to drive the movable arm 2 to perform telescopic movement inside the fixed arm 1.
[0044] In this embodiment, the movable arm 2 can move within the fixed arm 1. Driven by the drive unit 3, the movable arm 2 performs telescopic movements, allowing for flexible adjustment of the extension length of the wrench arm according to operational needs. For example, when operating the small box clamp within the electrolytic cell, the wrench arm can extend outwards, enabling the working component to accurately reach the target position. When the equipment is moving or not in operation, the wrench arm can retract, reducing space occupation and improving the flexibility and safety of equipment operation. Furthermore, multiple guide wheels 4 are rotatably arranged along the length direction on the opposite sidewalls of the fixed arm 1, and the movable arm 2 contacts the guide wheels 4. The guide wheels 4 provide good guidance for the movable arm 2, ensuring smooth telescopic movement within the fixed arm 1 and preventing deviation, shaking, or jamming during telescopic movement. This improves the stability and reliability of the wrench arm's telescopic action, thereby ensuring the accuracy and efficiency of the small box clamp wrench during operation. Furthermore, by supporting and guiding the movement of the movable arm 2 with the guide wheel 4, rolling friction is formed, which can effectively reduce the direct friction between the movable arm 2 and the fixed arm 1, reduce the wear of the parts, thereby significantly extending the service life of the wrench arm, reducing equipment maintenance costs, and improving the continuity and stability of production operations.
[0045] In actual operating scenarios such as aluminum electrolysis workshops, the wrench arms are arranged vertically to accommodate operations such as anode replacement. In this configuration, the fixed arm 1 is vertical with an open bottom, allowing the movable arm 2 to extend and retract smoothly from the bottom. This facilitates the movable arm 2's vertical downward extension under the drive unit 3, precisely contacting the small box clamps within the electrolytic cell. Furthermore, in non-operating states, the movable arm 2 can retract into the fixed arm 1, avoiding space occupation issues caused by vertical arrangement and ensuring the safety and flexibility of equipment operation.
[0046] Specifically, the fixed arm 1 has a hollow structure, and multiple guide wheels 4 are rotatably mounted on the walls of two opposite sides of the hollow structure along its length. When the wrench arm extends or retracts, the movable arm 2 comes into contact with the guide wheels 4. The guide wheels 4 not only support the movable arm 2 but also guide it to move smoothly within the fixed arm 1. Simultaneously, since the guide wheels 4 are rotatable, they rotate along with the movable arm 2, converting the sliding friction between the movable arm 2 and the fixed arm 1 into rolling friction, greatly reducing friction and minimizing wear on components. In practical applications, if the fixed arm 1 has a square cross-section with its four sides facing each other in pairs, guide wheels 4 can be installed on the walls of all four sides to further enhance the support and guidance of the movable arm 2. This significantly improves the stability and reliability of the movable arm 2 during extension and retraction, ensuring that the wrench arm can still complete its tasks efficiently and accurately under complex working conditions.
[0047] The movable arm 2 is connected to the drive unit 3, so that the drive unit 3 can transmit power to the movable arm 2, thereby driving the movable arm 2 to perform telescopic movement within the fixed arm 1.
[0048] Specifically, the drive unit 3 is mounted on the fixed arm 1, ensuring the relative stability between the drive unit 3 and the fixed arm 1 and providing reliable support for driving the movable arm 2. When the length of the wrench arm needs to be adjusted, the drive unit 3 starts working, transmitting power to the movable arm 2 through its connection with the movable arm 2. Driven by the drive unit 3, the movable arm 2 extends and retracts within the fixed arm 1 along the trajectory guided by the guide wheel 4. During the movement of the movable arm 2, the guide wheel 4 rotates continuously, reducing friction between the movable arm 2 and the fixed arm 1, ensuring the smooth movement of the movable arm 2, thereby achieving flexible adjustment of the wrench arm length to meet the needs of different operations such as the operation of the electrolytic cell box clamp.
[0049] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 1 As shown, the opposite sidewalls of the guide wheel 4 on the fixed arm 1 form a group.
[0050] In this embodiment, only one set of guide wheels 4 is provided on the fixed arm 1. Compared with providing multiple sets of guide wheels 4, this not only reduces the number of guide wheels 4 and their mounting components, thus reducing material costs, but also simplifies the assembly process, shortens the production cycle, and thereby reduces the overall manufacturing cost.
[0051] The fact that only one set of guide wheels 4 is provided on the fixed arm 1 means that among the multiple side walls that make up the fixed arm 1, only two side walls with opposite positions are selected to install guide wheels 4 to form a set of guide structures.
[0052] Specifically, the fixed arm 1 is generally a hollow columnar or frame-like structure with multiple sidewalls. A set of guide wheels 4 is distributed only on two opposing sidewalls, not on all sidewalls. The guide wheels 4 on these two opposing sidewalls are arranged along the length of the fixed arm 1 and contact the movable arm 2. When the movable arm 2 moves telescopically within the fixed arm 1 under the action of the drive unit 3, the guide wheels 4 provide support and guidance for the movable arm 2. Because the guide wheels 4 can rotate, they roll along with the movable arm 2 as it moves, transforming the sliding friction between the movable arm 2 and the fixed arm 1 into rolling friction, reducing friction and component wear.
[0053] In the above embodiments, see Figure 2 As shown, a groove 41 is provided around the outer edge of the guide wheel 4; a guide bar is provided on the movable arm 2 at a position corresponding to the guide wheel 4, and the guide bar extends along the length direction of the movable arm 2; when the drive unit 3 drives the movable arm 2 to perform telescopic movement within the fixed arm 1, the guide bar is embedded in the groove 41 of the guide wheel 4 and rolls within the groove 41 as the movable arm 2 moves.
[0054] Here, by setting a groove 41 around the outer edge of the guide wheel 4, the number of guide wheels 4 is reduced from two sets to one, achieving an optimized upgrade. The groove 41 and the corresponding guide strip on the movable arm 2 form a fitting structure. When the movable arm 2 extends and retracts within the fixed arm 1, the guide strip is embedded in the groove 41 and rolls, providing precise guidance and stable support for the movable arm 2. This replaces the traditional layout of two sets of guide wheels 4, significantly simplifying the overall structure of the fixed arm 1, greatly reducing the number of parts, and effectively reducing assembly complexity. This not only reduces material and labor costs in the manufacturing process but also reduces the risk of failure caused by numerous parts, providing a strong guarantee for the long-term stable operation of the equipment.
[0055] The guide wheel 4 is mounted on the opposite side wall of the fixed arm 1 and can rotate freely; the movable arm 2 is placed inside the fixed arm 1, and the guide strip is tightly fitted with the groove 41 of the guide wheel 4. In this configuration, the guide wheel 4 not only provides support for the movable arm 2 but also restricts the horizontal displacement of the movable arm 2, ensuring that it can only move along the length of the fixed arm 1.
[0056] Specifically, when the drive unit 3 starts working and drives the movable arm 2 to extend and retract within the fixed arm 1, the guide bar will embed itself in the groove 41 of the guide wheel 4 and roll within the groove 41 as the movable arm 2 moves. During this process, the guide wheel 4 rotates accordingly, converting the original sliding friction between the movable arm 2 and the fixed arm 1 into rolling friction, greatly reducing the friction force.
[0057] In some possible embodiments disclosed in this application, the movable arm 2 is a channel steel, and the guide bars are respectively disposed on two opposite outer walls of the channel steel and extend along the length direction of the channel steel.
[0058] In this embodiment, by setting the movable arm 2 to be a channel steel, the movable arm 2 can maintain high strength and stability when subjected to axial force and lateral force.
[0059] Among them, the channel steel has a channel-shaped cross section, which has good bending resistance and structural stability. When used as the movable arm 2, it is not easily deformed during operation, ensuring the reliability and stability of the equipment.
[0060] Specifically, when the outer edge of the guide wheel 4 is surrounded by a groove 41, and a guide strip is provided on the movable arm 2 at a position corresponding to the guide wheel 4, the guide strips are respectively set on two opposing outer walls of the channel steel. These two outer walls are relatively parallel, and the guide strips extend along the length of the channel steel, allowing the guide strips to be tightly integrated with the structure of the channel steel, making full use of the outer surface of the channel steel to provide a stable guiding path. At the same time, the guide strips extending along the length direction can provide continuous and stable guiding action throughout the entire extension and retraction stroke of the movable arm 2.
[0061] In the above embodiment, a plurality of reinforcing ribs are provided at intervals on the web of the channel steel, and the reinforcing ribs extend along the width direction of the channel steel.
[0062] Here, stiffeners can effectively improve the load-bearing capacity of the channel steel. When the channel steel is subjected to external forces, especially under large bending moments or pressures, stiffeners can share part of the load, making the web of the channel steel less prone to deformation or buckling, thereby enhancing the structural strength of the entire movable arm 2, enabling it to adapt to more complex and demanding working conditions and withstand greater external forces without damage.
[0063] Multiple reinforcing ribs are spaced along the web, providing uniform reinforcement across the entire web. It should be noted that this spacing ensures effective support in areas requiring reinforcement while avoiding excessive rib density that could lead to material waste and increased costs. Furthermore, appropriate spacing helps reduce the overall weight of the channel steel, making the movable arm 2 lighter and more flexible while maintaining strength.
[0064] The stiffeners extend along the width of the channel steel, meaning they are perpendicular to the web and span its width. This allows them to effectively resist the web's tendency to deform in the width direction. When the channel steel is subjected to external forces, the stiffeners can distribute the force to various parts of the web, improving the web's resistance to deformation and thus enhancing the overall structural stability of the channel steel. For example, when the movable arm 2 is subjected to lateral forces or bending moments during extension and retraction, the stiffeners extending along the width direction can better prevent the web from bending or twisting, ensuring the normal movement and structural safety of the movable arm 2.
[0065] In some possible embodiments disclosed in this application, the drive unit 3 is a hydraulic cylinder, which is disposed on the outside of the fixed arm 1 and located on the side close to the equipment operation channel.
[0066] In this embodiment, the hydraulic cylinder is positioned on the outside of the fixed arm 1, facilitating installation and disassembly without requiring complex arrangement and assembly inside the fixed arm 1, thus reducing installation difficulty and cost. Simultaneously, its proximity to the equipment's operating passage allows operators easy access to the hydraulic cylinder for routine inspections, maintenance, and repairs, such as checking for oil leaks, replacing seals, or debugging components. This improves equipment maintainability, reduces downtime, and increases equipment efficiency.
[0067] Specifically, the hydraulic cylinder can be a telescopic hydraulic cylinder, which can provide stable and large thrust or pull force, and can effectively drive the movable arm 2 to perform telescopic movement to meet the power requirements of the equipment under different working conditions.
[0068] In some possible embodiments disclosed in this application, the wrench arm further includes a connecting portion 5, which is disposed at the end of the fixed arm 1 away from its open end.
[0069] In this embodiment, the connecting part 5 provides a clear location and interface for the connection of the wrench arm to other components, making the installation process more convenient and accurate. During installation, the fixed arm 1 can be quickly and accurately connected to the designated position through the connecting part 5, reducing installation errors, improving installation efficiency, and ensuring that the relative positional relationship between the wrench arm and other related components meets the design requirements, thereby guaranteeing the normal operation of the entire device.
[0070] Specifically, when the wrench arm is applied to the small box clamp wrench, the connecting part 5 is located at the top of the fixed arm 1, and the connecting part 5 is used to connect the fixed arm 1 with the lifting arm of the anode lifting device.
[0071] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.
[0072] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.
Claims
1. A wrench arm, characterized in that, include: Fixed arm (1), the fixed arm (1) is a hollow structure with at least one open end, and multiple guide wheels (4) are rotatably provided on the opposite side wall of the fixed arm (1) along the length direction of the fixed arm (1); Movable arm (2), which is movably disposed within the fixed arm (1) and is in contact with the guide wheel (4); The drive unit (3) is disposed on the fixed arm (1) and connected to the movable arm (2). The drive unit (3) is used to drive the movable arm (2) to perform telescopic movement within the fixed arm (1).
2. The wrench arm according to claim 1, characterized in that, The fixed arm (1) is provided with a set of opposite sidewalls of the guide wheel (4).
3. The wrench arm according to claim 2, characterized in that, The outer edge of the guide wheel (4) is provided with a groove (41); A guide bar is provided on the movable arm (2) at a position corresponding to the guide wheel (4), and the guide bar extends along the length direction of the movable arm (2); When the drive unit (3) drives the movable arm (2) to extend and retract within the fixed arm (1), the guide bar is embedded in the groove (41) of the guide wheel (4) and rolls within the groove (41) as the movable arm (2) moves.
4. The wrench arm according to claim 3, characterized in that, The movable arm (2) is a channel steel, and the guide strips are respectively disposed on two opposite outer walls of the channel steel and extend along the length direction of the channel steel.
5. The wrench arm according to claim 4, characterized in that, The web of the channel steel is provided with a plurality of reinforcing ribs at intervals, and the reinforcing ribs extend along the width direction of the channel steel.
6. The wrench arm according to claim 1, characterized in that, The drive unit (3) is a hydraulic cylinder, which is located on the outside of the fixed arm (1) and on the side close to the equipment operation channel.
7. The wrench arm according to claim 1, characterized in that, Also includes: A connecting part (5) is provided at one end of the fixed arm (1) away from its open end.
8. A small box clamp wrench, characterized in that, include: The wrench arm as described in any one of claims 1-7; A torsion mechanism (6) is provided at one end of the movable arm (2) away from the fixed arm (1). The torsion mechanism (6) is used to fasten and loosen the small box clamp.
9. The small box clamp wrench according to claim 8, characterized in that, Also includes: A hydraulic motor (7) is directly connected to the torsion mechanism (6).
10. An anode lifting device, characterized in that, include: The small box clamp wrench as described in claim 8 or claim 9; The hoisting arm is fixedly mounted on the overhead crane and connected to the small box clamp wrench.