Multifunctional double-end wrench

Abstract

The invention provides a multifunctional double-end wrench. The multifunctional double-end wrench comprises wrench heads with teeth at the two ends and a handle connected with the wrench heads. At least one magnetic material layer is arranged on the inner side tooth surface of the wrench head, and the magnetic material layer is fixed to the tooth top area of the tooth surface through an embedded structure; the connecting interface of the magnetic material layer and the wrench head adopts a gradient transition structure; the gradient transition structure comprises a metal bonding layer, an elastic buffer layer and an epoxy resin sealing layer which are arranged in sequence; the thickness direction of the magnetic material layer is consistent with the tooth-shaped normal direction of the wrench head, and the magnetic induction intensity of the magnetic material layer forms an adsorption magnetic field of 200-500 mT in a tooth crest area. According to the multifunctional double-end wrench, the magnetic material layer is arranged in the tooth crest area of the multifunctional double-end wrench, the bottom face of a screw cap can be directly attracted, surface contact attraction force is formed, compared with a traditional single-point magnetic attraction mode, the attraction stability is improved by 40% or above, and the screw falling risk can be reduced by 70% in the inclined operation or vibration environment.

Description

Technical Field

[0001] The present application relates to the field of tool technology, and in particular to a multifunctional double-ended wrench. Background Art

[0002] During installation and withdrawal work at fully mechanized coal mining faces, the fastening screws of fully mechanized equipment (such as shearers and scraper conveyors) and electrical equipment (such as switches and cables) must be frequently removed and installed. This work involves a wide range of standard and special-shaped screws (8-22mm in diameter), and the working environment is complex, characterized by cramped space, poor lighting, and dust pollution. This places stringent demands on tool portability, adaptability, and operational efficiency.

[0003] Traditional wrenches usually adopt a fixed opening design, and a single-specification wrench can only adapt to screws of a specific size. Construction workers need to carry multiple wrenches of different specifications (such as 8mm, 10mm, 14mm, etc.) according to on-site requirements and complete the work by manually changing tools. When using existing wrenches, it is necessary to select the corresponding tool by observing the screw specifications, and it is necessary to frequently switch wrenches of different opening sizes. Some improved wrenches adopt an adjustable opening design (such as a movable wrench), but their adjustment structure is complex, the opening accuracy is insufficient, and they cannot adapt to special-shaped fasteners. In addition, the few multi-functional wrenches on the market are mostly simple combinations of sockets and wrenches. They are bulky and have low functional integration, making it difficult to meet the special needs of underground operations.

[0004] Currently, wrenches are inconvenient to carry. A single worker must carry more than 10 different wrenches, increasing their workload. Carrying multiple wrenches requires frequent replacement, leading to low efficiency and the risk of misuse. Traditional wrenches only fit standard screws and are insufficient for handling rusted screws and special-shaped fasteners (such as square and torx heads) commonly found underground. Furthermore, existing wrench designs often neglect operator protection, making them prone to slippage and hand injuries. Summary of the Invention

[0005] The present application provides a multifunctional double-ended wrench to solve the problem that existing wrenches have relatively single size specifications and multiple wrenches need to be carried during work, which makes carrying inconvenient and the work efficiency is low due to frequent replacement.

[0006] The present application provides a multifunctional double-ended wrench, comprising:

[0007] A spanner with teeth at both ends and a handle connected to the spanner;

[0008] The inner tooth surface of the wrench is provided with at least one magnetic material layer, and the magnetic material layer is fixed to the tooth top area of ​​the tooth surface through an embedded structure;

[0009] The connection interface between the magnetic material layer and the tooth surface adopts a gradient transition structure, and the gradient transition structure includes a metal bonding layer, an elastic buffer layer and an epoxy resin sealing layer arranged in sequence;

[0010] The thickness direction of the magnetic material layer is consistent with the normal direction of the tooth profile of the wrench head, and the magnetic induction intensity forms an adsorption magnetic field of 200-500mT in the tooth top area.

[0011] In some possible implementations, a positioning assembly is further included. The positioning assembly is disposed in the wrench and is used to accurately position and lock the wrench.

[0012] In some possible implementations, the positioning assembly includes a hexagonal positioning groove, and a threaded hole for fixing is provided at the bottom of the hexagonal positioning groove.

[0013] In some possible implementations, a strong magnet is embedded in the hexagonal positioning groove for quickly adsorbing the wrench.

[0014] In some possible implementations, the side length of the hexagon is 15-18 mm, and the height of the hexagon is 13-15 mm.

[0015] In some possible implementations, an accessory interface is provided at the end of the handle, and the accessory interface is located on the extension line of the handle axis, and the distance from the farthest end surface of the wrench is 30%-50% of the length of the handle.

[0016] In some possible implementations, a buckle is provided on the accessory interface, so that the tool accessory is fixed to the accessory interface by the buckle.

[0017] In some possible implementations, the magnetic material layer is a neodymium iron boron alloy magnet, and the distribution length of the magnetic material layer along the tooth surface is 30%-50% of the tooth height.

[0018] In some possible implementations, the thickness of the metal bonding layer is 5-50 μm, and the metal used in the metal bonding layer is one of nickel-based alloy, copper alloy, and titanium alloy.

[0019] In some possible implementations, the elastic buffer layer is a polyurethane elastomer with a Shore hardness of 80A-90A;

[0020] The epoxy resin sealing layer has a thickness of 0.1-0.3 mm, a tensile strength of ≥50 MPa, and an elongation at break of ≤5%.

[0021] From the above content, it can be seen that the present application provides a multifunctional double-ended wrench, which includes: a spanner with teeth at both ends and a handle connected to the spanner; the inner tooth surface of the spanner is provided with at least one magnetic material layer, and the magnetic material layer is fixed to the tooth top area of ​​the tooth surface through an embedded structure; the connection interface between the magnetic material layer and the spanner adopts a gradient transition structure, and the gradient transition structure includes a metal bonding layer, an elastic buffer layer and an epoxy resin sealing layer arranged in sequence; the thickness direction of the magnetic material layer is consistent with the normal direction of the tooth profile of the spanner, and its magnetic induction intensity forms an adsorption magnetic field of 200-500mT in the tooth top area. In the present application, a magnetic material layer is provided in the tooth top area of ​​the multifunctional double-ended wrench, which can directly adsorb the bottom surface of the nut to form a surface contact adsorption force, which improves the adsorption stability by more than 40% compared with the traditional single-point magnetic adsorption method, and can reduce the risk of screw falling by 70% in inclined operations or vibration environments. The multifunctional double-ended wrench provided in the present application is suitable for high-altitude operations in coal mines (such as screw installation on the top of hydraulic supports), reducing equipment damage or personal injury caused by falling screws. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram of a multifunctional double-ended wrench in an embodiment provided in this application;

[0024] Figure 2 This is a schematic structural diagram of the connecting portion in the embodiment provided in this application.

[0025] Illustration: 1-wrench head; 2-handle; 3-magnetic material layer; 4-connecting part; 11-tooth surface; 41-metal bonding layer; 42-elastic buffer layer; 43-epoxy resin sealing layer. DETAILED DESCRIPTION

[0026] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0027] During installation and withdrawal work at fully mechanized coal mining faces, the fastening screws of fully mechanized equipment (such as shearers and scraper conveyors) and electrical equipment (such as switches and cables) must be frequently removed and installed. This work involves a wide range of standard and special-shaped screws (8-22mm in diameter), and the working environment is complex, characterized by cramped space, poor lighting, and dust pollution. This places stringent demands on tool portability, adaptability, and operational efficiency.

[0028] Traditional wrenches usually adopt a fixed opening design, and a single-specification wrench can only adapt to screws of a specific size. Construction workers need to carry multiple wrenches of different specifications (such as 8mm, 10mm, 14mm, etc.) according to on-site requirements and complete the work by manually changing tools. When using existing wrenches, it is necessary to select the corresponding tool by observing the screw specifications, and it is necessary to frequently switch wrenches of different opening sizes. Some improved wrenches adopt an adjustable opening design (such as a movable wrench), but their adjustment structure is complex, the opening accuracy is insufficient, and they cannot adapt to special-shaped fasteners. In addition, the few multi-functional wrenches on the market are mostly simple combinations of sockets and wrenches. They are bulky and have low functional integration, making it difficult to meet the special needs of underground operations.

[0029] Currently, wrenches are inconvenient to carry. A single worker must carry more than 10 different wrenches, increasing their workload. Carrying multiple wrenches requires frequent replacement, leading to low efficiency and the risk of misuse. Traditional wrenches only fit standard screws and are insufficient for handling rusted screws and special-shaped fasteners (such as square and torx heads) commonly found underground. Furthermore, existing wrench designs often neglect operator protection, making them prone to slippage and hand injuries.

[0030] Based on this, in order to solve the problem that the existing wrenches have relatively single size specifications, multiple wrenches need to be carried during work, which makes it inconvenient to carry and the work efficiency is low due to frequent replacement. Figure 1 and Figure 2 As shown, the present application provides a multifunctional double-ended wrench.

[0031] The multifunctional double-ended wrench comprises:

[0032] A spanner 1 with teeth at both ends and a handle 2 connected to the spanner;

[0033] The inner tooth surface 11 of the wrench head 1 is provided with at least one magnetic material layer 3, and the magnetic material layer 3 is fixed to the tooth top area of ​​the tooth surface 11 through an embedded structure;

[0034] The connection portion 4 between the magnetic material layer 3 and the tooth surface 11 adopts a gradient transition structure, and the connection portion 4 includes a metal bonding layer 41, an elastic buffer layer 42 and an epoxy resin sealing layer 43 arranged in sequence;

[0035] The thickness direction of the magnetic material layer 3 is consistent with the normal direction of the tooth profile of the wrench head 1, and its magnetic induction intensity forms an adsorption magnetic field of 200-500 mT in the tooth top area.

[0036] The multifunctional double-ended wrench provided in this application has a magnetic material layer 3 in the wrench head 1 arranged in the tooth top area, in direct contact with the bottom surface of the nut, forming a uniform adsorption force field (200-500mT), which improves the adsorption stability by more than 40% compared with the traditional single-point magnetic adsorption method, and can reduce the risk of screws falling in tilted operations or vibrating environments. The thickness direction of the magnetic material layer is consistent with the tooth normal, ensuring that the adsorption force acts perpendicularly on the screw axis, avoiding torque transmission deviation and improving operational safety. The magnetic adsorption function enables the screw to automatically align with the tooth groove, shortening the installation time of a single screw by 35%-50%, and reducing the alignment adjustment steps of the tool and the screw.

[0037] The synergistic effect of tooth surface adsorption and adaptive tooth profile supports bidirectional installation / removal operations, eliminating the need for tool reversal and improving operational efficiency. The metal bonding layer 41 enhances interfacial strength through metallurgical bonding (shear strength ≥ 120 MPa), the elastic buffer layer 42 absorbs impact energy, and the epoxy resin sealing layer 43 provides IP67 protection, extending the life of the magnetic layer. The embedded structure in the tooth top area and the tooth root stress relief groove work together to reduce the incidence of tooth fatigue cracks, extending tool life by 40%.

[0038] In some embodiments, a positioning assembly is further included. The positioning assembly is disposed inside the wrench and is used to accurately position and lock the wrench 1 .

[0039] The positioning assembly precisely determines the relative position of the wrench head 1 and the screw, preventing it from shifting or shaking when tightening or loosening. For example, when working in confined spaces, traditional wrenches can easily slip out of the screw due to inaccurate positioning, damaging the threads. With the positioning assembly, positioning errors are kept to a minimum, ensuring precise engagement of the screw with every operation, reducing errors and improving operational accuracy. Its locking function also enhances the stability of the connection between the wrench head 1 and the screw, preventing it from easily disengaging even when applying high torque, ensuring smooth operation. The positioning assembly allows for quick and precise positioning of the wrench head 1, reducing the time required to find the appropriate force position and adjust the angle of the wrench head 1. In work scenarios where screw specifications need to be frequently changed, operators can quickly locate and lock the wrench head 1 onto the target screw without repeated attempts, significantly reducing the time required to operate a single screw and thus improving overall work efficiency. For example, at the installation site of large equipment, using a wrench with a positioning assembly can increase installation speed by 30%-50%.

[0040] By setting a positioning component in the wrench, the time for finding the appropriate force application position and adjusting the wrench head angle can be reduced, solving the problem of low efficiency caused by frequent replacement of existing wrenches, and indirectly reducing the burden of workers carrying multiple wrenches.

[0041] In some embodiments, the positioning assembly includes a hexagonal positioning groove, and a threaded hole for fixing is provided at the bottom of the hexagonal positioning groove.

[0042] The hexagonal positioning groove precisely matches the common hexagonal bolt head or nut. Utilizing the geometric properties of the hexagon, the wrench head 1 can be quickly and accurately aligned with the bolt or nut. Compared to traditional wrenches, during the installation or removal process, the error can be controlled within a very small range, effectively avoiding uneven force due to inaccurate positioning, reducing the risk of thread damage, and greatly improving operational accuracy, making the operation more standardized and reliable. During the process of tightening or loosening screws, especially when a large torque is required, this fixing method can prevent the wrench from accidentally falling off or slipping, greatly enhancing the stability of the connection. In dangerous environments such as high-altitude operations and operations in narrow spaces, it greatly ensures the safety of operators and avoids safety accidents caused by the wrench slipping.

[0043] The hexagonal locating slot design is not only suitable for conventional bolts and nuts, but also facilitates the connection of various hexagonal-based tool accessories, such as sockets of different specifications and extension rods. By combining these accessories, the wrench can easily handle screws of different sizes and positions, expanding the wrench's range of uses and making it more versatile to meet diverse work needs.

[0044] In some embodiments, a strong magnet is embedded in the hexagonal positioning groove for quickly adsorbing the wrench head 1 .

[0045] In some embodiments, the side length of the hexagon is 15-18 mm, and the height of the hexagon is 13-15 mm.

[0046] The hexagonal positioning groove in the present application is embedded with a strong magnet, which can quickly generate an adsorption force when the spanner 1 is close to the positioning groove, thereby achieving rapid adsorption. This greatly shortens the docking time between the spanner 1 and the positioning groove. In actual operation, for example, in time-sensitive work scenarios such as underground in a coal mine, workers can complete the installation of the spanner 1 more efficiently, thereby improving work efficiency. The adsorption effect of the strong magnet helps the spanner 1 to accurately fall into the hexagonal positioning groove and automatically achieve precise alignment. This avoids the problem of taking time to adjust the angle and position in the traditional installation method, ensures the accuracy of the installation of the spanner 1, and reduces the risk of installation errors and equipment damage caused by inaccurate alignment.

[0047] The strong magnet's attraction forces the wrench head 1 tightly against the positioning slot, effectively preventing it from loosening or falling off during operation. This tight connection ensures stable force transmission, especially when high torque is applied, improving operational safety and reliability. Strong magnetic attraction also provides a certain degree of shock absorption. When the wrench head 1 is impacted or vibrated, the strong magnet absorbs some of the energy, minimizing damage to the wrench head and positioning assembly, thereby extending the tool's service life.

[0048] In some embodiments, an accessory interface is provided at the end of the handle 2 , and the accessory interface is located on the extension line of the axis of the handle 2 , and the distance from the farthest end surface of the wrench 1 is 30%-50% of the length of the handle 2 .

[0049] The accessory port is located on the extended axis of the handle, allowing the user to grip the handle naturally and easily connect and remove accessories without changing their posture. Furthermore, the port is positioned 30%-50% of the handle length from the farthest end of the wrench head. This position ensures a smooth overall operating space after connecting accessories, preventing operational flexibility from being affected by overly long or short accessories. For example, when connecting a screwdriver, screws can be easily reached without any obstruction caused by an improperly positioned port, improving work efficiency. This placement of the accessory port helps balance the center of gravity of the wrench and accessory when combined. When connecting heavier accessories, such as pliers, the port's specific location keeps the center of gravity closer to the grip area, preventing instability caused by excessive center of gravity shifts. This makes the wrench easier to control and reduces hand fatigue, especially during extended work. The accessory port allows the wrench to connect to a variety of accessories with different functions, such as screwdrivers and pliers, achieving tool versatility. A single wrench can be quickly converted to other tools based on work needs, eliminating the need to carry multiple separate tools and reducing the burden of carrying tools. In complex work scenarios, such as equipment maintenance sites, tool functions can be switched at any time to meet different work requirements.

[0050] In some embodiments, a buckle is provided on the accessory interface so that the tool accessory can be fixed to the accessory interface by the buckle.

[0051] Clips securely secure tool accessories, preventing them from accidentally falling off during use. Tightening or loosening a screw with a wrench often generates high torque and vibration. If the attachment is not securely connected, it can easily become loose or even fall off. The clips on the attachment interface ensure a tight connection between the accessory and the wrench, ensuring more stable force transmission, improving work efficiency and reliability. To install an accessory, simply align the accessory with the interface and gently push, and the clip automatically locks in place. To remove the accessory, simply press or release the clip to easily remove it. This quick connection and removal method significantly saves time and is particularly advantageous in work scenarios where frequent accessory changes are required. In challenging environments such as working at height or in confined spaces, the accidental detachment of tool accessories can cause safety accidents and damage to personnel and equipment. The secure retention of the clips effectively reduces this risk, ensuring operator safety. Furthermore, the stable connection improves operational accuracy and reduces errors caused by accessory movement.

[0052] The clip design allows the wrench to easily connect to a variety of tool accessories. As long as the accessory meets the clip's specifications, it can be quickly connected and secured. This greatly expands the wrench's functionality, enabling it to adapt to more diverse work needs and improving the tool's versatility and practicality.

[0053] In some embodiments, the magnetic material layer 3 is a neodymium iron boron alloy magnet, and the distribution length of the magnetic material layer along the tooth surface 11 is 30%-50% of the tooth height.

[0054] Neodymium iron boron alloy magnets possess extremely high magnetic energy product and coercive force, generating a powerful holding force. They securely hold screws while the wrench is in operation, effectively preventing them from falling even in tilted, vibrating, or complex working environments. This significantly reduces the risk of falling screws during installation at height or in confined spaces, ensuring construction safety and preventing equipment damage or personal injury from falling screws.

[0055] The magnetic material layer is distributed along a specific length of the tooth surface and can act precisely on the screws, helping users to quickly locate the screws and reducing the time spent searching for and aligning the screws. When installing or removing screws, there is no need to manually support the screws, and one-handed operation is possible, which improves work efficiency. This advantage is especially evident in conditions of insufficient light or limited operating space, reducing operational difficulty and increasing operational convenience. The distributed length of 30%-50% of the tooth height ensures sufficient magnetic adsorption force without affecting the structural strength of the wrench teeth due to an excessively long magnetic material layer. This avoids problems such as excessive weight and easy breakage of the teeth due to excessive magnetic material, ensuring that the wrench maintains good structural stability even when subjected to large torques, thereby extending the service life of the wrench.

[0056] In some embodiments, the thickness of the metal bonding layer 41 is 5-50 μm, and the metal used in the metal bonding layer is one of nickel-based alloy, copper alloy, and titanium alloy.

[0057] The 5-50μm metal bonding layer ensures a reliable bond between the magnetic layer and the wrench head. Nickel-based alloys, copper alloys, or titanium alloys all possess excellent metallurgical bonding properties, forming a strong chemical bond with the magnetic layer and the wrench body, seamlessly integrating the three. During use, the magnetic layer resists dislodging even when subjected to high torque and impact forces, ensuring the integrity and stability of the wrench's structure and extending its service life.

[0058] Nickel-based alloys, copper alloys, and titanium alloys all possess excellent corrosion resistance. The nickel element in nickel-based alloys forms a dense oxide film on the surface, effectively resisting erosion by the atmosphere, moisture, and chemicals. Copper alloys offer excellent corrosion resistance, particularly in weakly acidic and alkaline environments. Titanium alloys possess exceptional corrosion resistance and remain stable even in harsh environments. Using these alloys as a metal bonding layer effectively prevents corrosion of the magnetic material layer and the wrench base, extending the service life of the wrench in humid and corrosive environments and reducing maintenance costs.

[0059] During the use of a wrench, friction generates heat, and changes in ambient temperature can also affect the wrench's structure. Nickel-based alloys, copper alloys, and titanium alloys all have good thermal stability and can maintain excellent mechanical properties within a certain temperature range. They effectively transfer heat, preventing local overheating that can cause demagnetization of the magnetic material layer or structural damage, ensuring that the wrench can function properly under different temperature conditions, broadening the wrench's range of environmental applications.

[0060] In some embodiments, the elastic buffer layer 42 is a polyurethane elastomer with a Shore hardness of 80A-90A; the epoxy resin sealing layer 43 has a thickness of 0.1-0.3 mm, a tensile strength of ≥50 MPa, and an elongation at break of ≤5%.

[0061] The polyurethane elastomer exhibits excellent elasticity and cushioning properties. With a Shore hardness of 80A-90A, it effectively absorbs impact energy during wrench use. Tightening or loosening a screw with a wrench can generate significant impact force. The elastic buffer layer reduces damage to the wrench itself and the operated components, extending the lifespan of both. This elastomer also acts as a buffer when the magnetic layer and other components are subjected to external forces, such as compression or collision, preventing the magnetic layer from cracking or damaging due to direct force. This protects the integrity of the magnetic layer and ensures the proper functioning of its adsorption function.

[0062] The 0.1-0.3mm thick epoxy resin sealing layer can effectively prevent moisture, dust, oil and other foreign substances from invading the interior of the wrench, avoiding corrosion and contamination of internal components, thereby improving the reliability and service life of the wrench.

[0063] The gradient transition structure composed of the metal bonding layer, elastic buffer layer and epoxy resin sealing layer not only enhances the connection strength between the magnetic material layer and the wrench head, but also absorbs impact energy and prevents the intrusion of foreign substances, thereby comprehensively improving the structural stability, durability and reliability of the wrench.

[0064] Enhanced structural strength: The epoxy resin sealant with a tensile strength of 50 MPa or higher can enhance the overall structural strength of the wrench, making it more durable and sturdy. It can withstand certain external forces without breaking or deforming, helping to maintain the shape and dimensional stability of the wrench and ensuring its normal use.

[0065] During use, the user holds the handle 2 and tightly engages the tooth surface 11 of the wrench 1 with the operated parts such as bolts and nuts. Then, by manually rotating the handle 2, the wrench 1 generates torque around the operated part, thereby tightening or loosening the operated part and completing the basic tightening operation. The tooth top area of ​​the inner tooth surface 11 of the wrench 1 is provided with a magnetic material layer 3, which can form an adsorption magnetic field of 200-500mT. This magnetic field can generate adsorption force on ferromagnetic workpieces such as bolts and nuts to prevent them from falling during operation. On the one hand, it is convenient for users to position the workpiece, saving time in searching and aligning the workpiece; on the other hand, it avoids the safety hazards and the trouble of secondary searching caused by the falling of the workpiece when working at high altitudes and narrow spaces, significantly improving work efficiency.

[0066] The connection 4 between the magnetic layer 3 and the wrench head 1 features a gradient transition structure. The metal bonding layer 41 acts as a bond, firmly connecting the magnetic layer 3 to the wrench head 1 and ensuring they do not separate under torque. The elastic buffer layer 42 absorbs impact energy generated during operation, protecting the magnetic layer 3 and the wrench head 1 from damage and extending their service life. The epoxy resin sealing layer 43 forms a sealing barrier, effectively preventing the intrusion of foreign matter such as moisture, dust, and oil, and maintaining the stability of the internal structure.

[0067] The hexagonal positioning slot in the positioning assembly precisely mates with workpieces or tools of specific shapes, enabling precise positioning of the wrench head 1 and minimizing operational deviation. The threaded holes at the bottom of the slot allow for further bolt fixation, enhancing the stability of the connection between the wrench head and the workpiece during operation. Furthermore, a strong magnet embedded in the hexagonal positioning slot quickly attracts the wrench head 1, assisting in positioning and securing it, making operation more convenient and efficient.

[0068] The end of handle 2 is located on an extended axis, 30%-50% of the handle's length away from the farthest end of wrench head 1. This port allows for connecting various accessories, such as screwdrivers and small pliers, as well as auxiliary devices like lighting and torque measurement. This flexible accessory interface allows the wrench to adapt to different work scenarios, greatly expanding its functionality and transforming it from a simple fastening tool into a multifunctional work tool.

[0069] The multifunctional double-ended wrench consists of a toothed wrench and a handle. The toothed wrench can tighten screws 8-13mm on one end and 14-22mm on the other. It adapts to screw size, allowing the large end to tighten large screws and the small end to tighten small screws. There's no need to turn your hand when tightening screws. The smooth opening protects the threads, preventing slippage and damage to parts. It's suitable for both equipment installers and electricians, and can easily handle special-shaped screws.

[0070] As can be seen from the above embodiments, the present application provides a multifunctional double-ended wrench, which comprises: a spanner with teeth at both ends and a handle connected to the spanner; the inner tooth surface of the spanner is provided with at least one magnetic material layer, and the magnetic material layer is fixed to the tooth top area of ​​the tooth surface through an embedded structure; the connection interface between the magnetic material layer and the spanner adopts a gradient transition structure, and the gradient transition structure includes a metal bonding layer, an elastic buffer layer and an epoxy resin sealing layer arranged in sequence; the thickness direction of the magnetic material layer is consistent with the normal direction of the tooth profile of the spanner, and its magnetic induction intensity forms an adsorption magnetic field of 200-500mT in the tooth top area. In the present application, a magnetic material layer is provided in the tooth top area of ​​the multifunctional double-ended wrench, which can directly adsorb the bottom surface of the nut to form a surface contact adsorption force, which improves the adsorption stability by more than 40% compared with the traditional single-point magnetic adsorption method, and can reduce the risk of screw falling by 70% in inclined operations or vibration environments. The multifunctional double-ended wrench provided in the present application is suitable for high-altitude operations in coal mines (such as screw installation on the top of hydraulic supports), reducing equipment damage or personal injury caused by falling screws.

[0071] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this application.

Claims

1. A multifunctional double-ended wrench, characterized in that: The wrench comprises: A spanner (1) with teeth at both ends and a handle (2) connected to the spanner; The inner tooth surface (11) of the wrench head (1) is provided with at least one magnetic material layer (3), and the magnetic material layer (3) is fixed to the tooth top area of ​​the tooth surface (11) through an embedded structure; The connection portion (4) between the magnetic material layer (3) and the tooth surface (11) adopts a gradient transition structure, and the connection portion (4) includes a metal bonding layer (41), an elastic buffer layer (42), and an epoxy resin sealing layer (43) arranged in sequence; The thickness direction of the magnetic material layer (3) is consistent with the normal direction of the tooth profile of the wrench head (1), and its magnetic induction intensity forms an adsorption magnetic field of 200-500 mT in the tooth top area.

2. The multifunctional double-ended wrench according to claim 1, characterized in that: It also includes a positioning component, which is arranged in the wrench head and is used for accurately positioning and locking the wrench head (1).

3. The multifunctional double-ended wrench according to claim 2, characterized in that: The positioning assembly includes a hexagonal positioning groove, and a threaded hole for fixing is provided at the bottom of the hexagonal positioning groove.

4. The multifunctional double-ended wrench according to claim 3, characterized in that: A strong magnet is embedded in the hexagonal positioning groove for quickly adsorbing the wrench (1), and the strong magnet is installed in the positioning groove by gluing or fixing with a slot.

5. The multifunctional double-ended wrench according to claim 4, characterized in that: The side length of the hexagon is 15 to 18 mm, and the height of the hexagon is 13 to 15 mm.

6. The multifunctional double-ended wrench according to claim 1, characterized in that: An accessory interface is provided at the end of the handle (2), and the accessory interface is located on the extension line of the axis of the handle (2), and the distance from the farthest end surface of the wrench (1) is 30%-50% of the length of the handle (2).

7. The multifunctional double-ended wrench according to claim 6, characterized in that: The accessory interface is provided with a buckle, so that the tool accessory can be fixed on the accessory interface through the buckle.

8. The multifunctional double-ended wrench according to claim 1, characterized in that: The magnetic material layer (3) is a neodymium iron boron alloy magnet, and the distribution length of the magnetic material layer along the tooth surface (11) is 30%-50% of the tooth height.

9. The multifunctional double-ended wrench according to claim 8, characterized in that: The thickness of the metal bonding layer (41) is 5-50 μm, and the metal used in the metal bonding layer is one of nickel-based alloy, copper alloy and titanium alloy.

10. The multifunctional double-ended wrench according to claim 9, characterized in that: The elastic buffer layer (42) is a polyurethane elastomer with a Shore hardness of 80A-90A; The epoxy resin sealing layer (43) has a thickness of 0.1-0.3 mm, a tensile strength of ≥50 MPa, and an elongation at break of ≤5%.

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