Tool bit connection structure and wireless planer

Abstract

The utility model provides a kind of tool bit connecting structure and wireless planer, it is related to medical instrument technical field, this kind of tool bit connecting structure, mainly by tool bit connecting piece and skeleton oil seal is constituted, tool bit connecting piece includes connecting piece body, skeleton oil seal cover is equipped in connecting piece body, connecting piece body is made of engineering plastics, and at least with the contact surface of skeleton oil seal is equipped with chrome plating layer.Compared with prior art, traditional metal tool bit connecting piece relies on precision machining and material cost is high, and ordinary plastic piece although cost is low but cannot satisfy wear resistance requirement.The utility model is combined by engineering plastics and chrome plating layer, on the basis of retaining plastic material forming efficiency is high, light in weight, by local surface strengthening, solve the problem that contact surface is easy to wear, both adapt to the low cost demand of disposable product, and ensure the reliability of connecting structure in limited use cycle.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a blade connection structure and a wireless planer. Background Technology

[0002] With economic development and social progress, my country's demand for medical security is increasing, and people are placing higher demands on medical products and systems, including medical devices. Medical planers, as widely used medical equipment, also need active improvement and optimization. Wireless planers are mainly used to trim human tissue, removing excess or undesirable tissue.

[0003] Existing medical planers consist of a handle housing, a skeleton oil seal, a cutter head connector, and planing blades. The main function of the skeleton oil seal is to prevent liquid from entering the handle housing, protect the controller, and transmit the power output from the controller. The cutter head connector is made of metal, and the skeleton oil seal is mainly composed of nitrile rubber and a spring. This structure is suitable for equipment that operates under high loads for extended periods.

[0004] However, the handle housing of existing cordless planers is a disposable product. Using traditional processes results in high production costs and low efficiency. If a plastic cutter head connector and a skeleton oil seal are used directly, the connector wears out rapidly, failing to meet the design lifespan requirements. Therefore, finding a suitable disposable cutter head connection structure to reduce production costs while ensuring connection strength and service life has become a pressing technical problem for those skilled in the art. Utility Model Content

[0005] In view of this, one of the objectives of this utility model is to provide a cutting head connection structure to solve the technical problem that the cutting head connector of the existing cutting head connection structure is made of metal material and the skeleton oil seal is made of nitrile rubber and spring, which leads to increased production costs as disposable products.

[0006] The second objective of this utility model is to provide a wireless planer with a cutter head connection structure.

[0007] To achieve one of the above objectives, this utility model provides a cutting head connection structure, including a cutting head connector and a skeleton oil seal. The cutting head connector includes a connector body, and the skeleton oil seal is sleeved on the connector body. The connector body is made of engineering plastic, and at least the contact surface with the skeleton oil seal is provided with a chrome-plated layer.

[0008] Optionally, the connector body has a lubricating layer between at least the contact surface with the skeleton oil seal.

[0009] Optionally, the engineering plastic is ABS resin.

[0010] Optionally, the connector body includes a handle connecting portion, a blade connecting portion, and an annular protrusion disposed between the handle connecting portion and the blade connecting portion.

[0011] Optionally, the cutter head connection portion and the annular protrusion are integrally formed.

[0012] Optionally, the handle connecting part, the blade connecting part, and the annular protrusion are integrally formed using a mold injection molding process.

[0013] Optionally, the skeleton oil seal includes a rigid skeleton and a rubber body, both of which are annular, and an annular groove is provided between the rigid skeleton and the rubber body.

[0014] Optionally, the deformation of the rubber body causes the annular groove to deform accordingly.

[0015] Optionally, the rigid skeleton is covered with a rubber layer, which is integrally formed with the rubber body.

[0016] To achieve the second objective mentioned above, this utility model provides a wireless planer, including any of the aforementioned cutter head connection structures, as well as a handle housing and a planer blade. One end of the cutter head connection structure is connected to the handle housing, and the other end is connected to the planer blade.

[0017] The tool head connection structure and wireless planer provided by this utility model have the following technical effects:

[0018] This type of cutter head connection structure mainly consists of a cutter head connector and a skeleton oil seal. The cutter head connector includes a connector body, and the skeleton oil seal is fitted onto the connector body. The connector body is made of engineering plastic, and at least the contact surface with the skeleton oil seal has a chrome-plated layer. Compared with existing technologies, traditional metal cutter head connectors rely on precision machining and have high material costs, while ordinary plastic parts, although low in cost, cannot meet wear resistance requirements. This utility model, through the combination of engineering plastic and chrome plating, retains the high molding efficiency and light weight of plastic materials, and solves the problem of easy wear on the contact surface through local surface strengthening. It not only meets the low-cost requirements of disposable products, but also ensures the reliability of the connection structure within a limited service life. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of the blade connection structure of this utility model;

[0021] Figure 2 yes Figure 1 Another three-dimensional structural diagram of the middle cutter head connection structure;

[0022] Figure 3 yes Figure 1 A three-dimensional structural diagram of the cutter head connector in the intermediate cutter head connection structure;

[0023] Figure 4 yes Figure 3 Another structural diagram of the middle cutter head connector;

[0024] Figure 5 yes Figure 1 A three-dimensional structural diagram of the skeleton oil seal of the middle cutter head connection structure;

[0025] Figure 6 yes Figure 5 Another structural diagram of the medium skeleton oil seal;

[0026] Figure 7 It contains Figure 1 A schematic diagram of the structure of a wireless planer with a central cutter head connection.

[0027] in, Figures 1-7 :

[0028] 1. Cutter head connector; 11. Handle connector; 12. Cutter head connector; 121. Chrome plating; 13. Annular protrusion; 2. Skeleton oil seal; 21. Hard skeleton; 22. Rubber body; 23. Annular groove; 3. Planer blade; 4. Handle housing. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] In existing technologies, the handle housing 4 of medical cordless planers is typically made of metal. While this meets the requirements for connection strength and service life, it results in high manufacturing costs and low production efficiency. Replacing metal with plastic reduces production costs, but the contact surface between the plastic cutter head connector 1 and the skeleton oil seal 2 is prone to wear, causing the device to fail to meet its design lifespan. This problem is particularly prominent in disposable cordless planer products, necessitating low-cost production while ensuring reliable connections.

[0031] To address the aforementioned issues, the inventors noted that the high cost of traditional metal cutter head connectors 1 stemmed from the difficulty of material processing and the complexity of the manufacturing process, while plastic materials, although inexpensive, suffered from insufficient wear resistance. By analyzing the friction mechanism between the skeleton oil seal 2 and the cutter head connector 1, they discovered that wear on the contact surface was a key factor affecting the lifespan of the plastic parts. Based on this, the inventors proposed introducing a coating onto the surface of the plastic substrate to improve wear resistance, while retaining the lightweight and low-cost advantages of plastic materials.

[0032] Therefore, this utility model proposes a blade connection structure, such as... Figure 1-7 As shown, the cutter head connection structure includes a cutter head connector 1 and a skeleton oil seal 2. The cutter head connector 1 includes a connector body, and the skeleton oil seal 2 is sleeved on the connector body. The connector body is made of engineering plastic, and at least the contact surface with the skeleton oil seal 2 is provided with a chrome plating layer 121.

[0033] The skeleton oil seal 2 is a sealing element composed of a rigid skeleton 21 and an elastic material. When fitted onto the connector body, it forms a dynamic sealing interface while transmitting power. Engineering plastics are high-molecular materials with high mechanical strength, heat resistance, and chemical stability. Specifically, ABS resin can be used, offering excellent molding and processing performance at a controllable cost. The chromium plating layer 121 is a metallic chromium coating layer formed on the surface of the engineering plastic through an electroplating process. This can be achieved using electroplating or chemical plating methods, and this layer significantly improves the hardness and wear resistance of the contact surface.

[0034] ABS resin is an acrylonitrile-butadiene-styrene copolymer. It is processed into the body of the connector using injection molding. ABS resin has impact resistance, corrosion resistance and dimensional stability, which can meet the mechanical strength requirements of the cutter head connector 1 under load conditions.

[0035] It should be noted that the chrome plating layer 121 on the contact surface with the skeleton oil seal 2, as well as the chrome plating layer 121 on the entire connector body, are all within the protection scope of this utility model.

[0036] Specifically, the connector body is injection molded from engineering plastic, and a chrome-plated layer 121 is provided on the surface of the contact area of ​​the skeleton oil seal 2, or the entire connector body is provided with a chrome-plated layer 121. When the skeleton oil seal 2 and the cutter head connector 1 move relative to each other, the chrome-plated layer 121 reduces wear by lowering the coefficient of friction, while the engineering plastic matrix provides sufficient structural strength. The chrome-plated layer 121 and the rigid skeleton 21 of the skeleton oil seal 2 form a matching friction pair, maintaining stable sealing performance under dynamic working conditions, while preventing the dimensional accuracy of the plastic matrix from decreasing due to long-term friction.

[0037] Compared with existing technologies, traditional metal cutter head connectors 1 rely on precision machining and have high material costs, while ordinary plastic parts, although low in cost, cannot meet wear resistance requirements. This utility model combines engineering plastics with a chrome-plated layer 121, which retains the high molding efficiency and light weight of plastic materials, and solves the problem of easy wear on the contact surface through local surface strengthening. It not only meets the low-cost requirements of disposable products, but also ensures the reliability of the connection structure within a limited service life.

[0038] Through the above technical solution, this utility model can achieve mass production of the cutter head connection structure at a lower cost, while avoiding premature wear of the contact surface between the plastic parts and the skeleton oil seal 2, thus meeting the comprehensive requirements of disposable medical wireless planers for structural strength, service life and economy.

[0039] In a preferred embodiment, a lubricating layer is provided between the connector body and the contact surface of the skeleton oil seal 2. The contact surface refers to the area where relative movement occurs between the connector body and the skeleton oil seal 2, and this area bears cyclic frictional loads during equipment operation. The lubricating layer refers to a layer of lubricating material covering the contact surface, specifically a biocompatible grease, which reduces friction and heat generation.

[0040] Specifically, the lubricating layer forms a continuous covering layer by adhering to the contact surface of the connector body. When the skeleton oil seal 2 moves relative to the connector body, the lubricating layer reduces material wear by reducing surface friction resistance, while avoiding local softening and deformation of the plastic body due to frictional heat.

[0041] As a preferred embodiment, such as Figure 3 and Figure 4 As shown, the connector body includes a handle connecting part 11, a blade connecting part 12, and an annular protrusion 13 disposed between the handle connecting part 11 and the blade connecting part 12.

[0042] The handle connecting part 11 is a structure for connecting with the handle housing 4, the cutter head connecting part 12 is a structure for connecting with the planer 3, and the annular protrusion 13 is an annular boss structure located between the handle connecting part 11 and the cutter head connecting part 12. Specifically, it can be integrally formed with the connecting part body through mold injection molding process, and its outer diameter is larger than the outer diameter of the handle connecting part 11 and the cutter head connecting part 12 to form a limiting step.

[0043] Specifically, the handle connecting part 11 is configured to be inserted into and fixed inside the handle housing 4, the cutter head connecting part 12 is configured to be assembled and connected with the planer 3, and the annular protrusion 13 is located between the two to form a transition structure. The outer surface of the cutter head connecting part 12 contacts the inner ring of the skeleton oil seal 2, and the axial limiting effect of the annular protrusion 13 prevents the skeleton oil seal 2 from sliding along the connecting body. During power transmission, the contact surface between the cutter head connecting part 12 and the skeleton oil seal 2 reduces the coefficient of friction through the chrome plating layer 121.

[0044] Preferably, the handle connecting part 11, the blade connecting part 12, and the annular protrusion 13 are integrally formed; more preferably, the handle connecting part 11, the blade connecting part 12, and the annular protrusion 13 are integrally formed by mold injection molding.

[0045] Mold injection molding refers to the process of injecting molten engineering plastic into a mold cavity using an injection molding machine and a mold, and then cooling and solidifying it to form a predetermined shape. Specifically, it can be achieved using thermoplastic injection molding technology, for example, by adjusting the injection pressure, temperature and mold structure parameters to control the molding accuracy.

[0046] Specifically, engineering plastic raw materials are heated and melted before being injected into a mold cavity containing the profile of the tool holder connection part 11, the tool head connection part 12, and the annular protrusion 13. After the filling, pressure holding, and cooling processes are completed in the mold, the part is demolded to directly obtain a connector body with a complete functional form. This process eliminates multiple processes such as turning and milling in traditional metal processing, while avoiding the problem of reduced connection strength caused by assembly errors in split structures.

[0047] As a preferred embodiment, such as Figure 5 and Figure 6 As shown, the skeleton oil seal 2 includes a rigid skeleton 21 and a rubber body 22. Both the rigid skeleton 21 and the rubber body 22 are annular, and an annular groove 23 is provided between the rigid skeleton 21 and the rubber body 22. Deformation of the rubber body 22 causes the annular groove 23 to deform accordingly.

[0048] The rigid skeleton 21 is an annular support structure made of metal or engineering plastic, specifically stainless steel or nylon, used to provide rigid support for the rubber body 22 and maintain the overall shape of the oil seal. The rubber body 22 is an elastic annular sealing component, specifically made of nitrile rubber, used to form a dynamic seal at the contact surface. The annular groove 23 is a continuous recessed structure between the rigid skeleton 21 and the rubber body 22, specifically formed by a molding process, used to accommodate the volume change of the rubber body 22 under pressure deformation.

[0049] Specifically, the rigid skeleton 21 is bonded to the rubber body 22 via injection molding to form a ring structure, with an annular groove 23 located at the junction of the two. When relative movement occurs between the cutter head connector 1 and the skeleton oil seal 2, the rubber body 22 undergoes elastic deformation due to compression or stretching. At this time, the annular groove 23 adjusts its shape synchronously with the deformation of the rubber body 22, ensuring that the contact surface between the oil seal and the connector remains in close contact. Through the deformation compensation of the annular groove 23, the stress distribution between the rigid skeleton 21 and the rubber body 22 is more uniform, avoiding local stress concentration that could lead to cracking or wear of the rubber body 22.

[0050] Compared with the existing technology where the spring is set in the annular groove 23, this structure can reduce the preload, extend the service life of the oil seal while ensuring sealing reliability, and is suitable for the low-cost production needs of disposable medical devices.

[0051] Specifically, the rigid skeleton 21 is covered with a rubber layer, which is integrally formed with the rubber body 22. The rubber layer refers to the elastic material layer covering the surface of the rigid skeleton 21, which can be made of nitrile rubber, and is used to form a transition interface between the rigid skeleton 21 and the rubber body 22, reducing contact surface friction and improving sealing performance.

[0052] Specifically, the rigid skeleton 21 serves as the rigid substrate of the skeleton oil seal 2, and its surface is covered with a rubber layer to form a composite structure. The rubber layer is molded simultaneously with the rubber body 22 during injection molding, forming a seamless, continuous sealing interface. When the cutter head connector 1 is assembled with the skeleton oil seal 2, the rubber layer of the rigid skeleton 21 contacts the chrome-plated layer 121 of the connector body, compensating for assembly tolerances through elastic deformation. Simultaneously, the overall structure of the rubber layer and the rubber body 22 effectively blocks liquid penetration paths.

[0053] This utility model also provides a wireless planer, such as Figure 7 As shown, it includes a cutter head connection structure, a handle housing 4, and a planer blade 3. One end of the cutter head connection structure is connected to the handle housing 4, and the other end is connected to the planer blade 3.

[0054] The cutter head connection structure, through the combination of an engineering plastic body and a chrome-plated layer 121, reduces frictional loss between the connecting body and the skeleton oil seal 2 while ensuring connection strength. The handle housing 4 is manufactured using a one-time injection molding process and is fixed to the cutter head connection structure by snap-fit ​​or thread. The planer 3 is connected to the other end of the cutter head connection structure via a plug-in or locking structure. During assembly, the skeleton oil seal 2 is fitted onto the surface of the cutter head connection structure, forming a sealing interface to prevent liquid from seeping into the handle housing 4.

[0055] Through the above technical solution, this utility model solves the problem of high production cost caused by the use of metal cutter head connector 1 in traditional wireless planers. By optimizing the material and structural design, it achieves low-cost manufacturing suitable for disposable products while meeting the requirements of sealing performance, connection strength and service life. At the same time, it avoids early failure of plastic parts due to wear. It works without abnormalities for 3 hours at a speed of 6000 RPM. The duration of a single operation is generally 1 hour, which meets the usage requirements.

[0056] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A tool bit connection structure comprising a tool bit connection member and a skeleton oil seal, characterized by, The cutter head connector includes a connector body, and the skeleton oil seal is sleeved on the connector body. The connector body is made of engineering plastic and has a chrome-plated layer on at least the contact surface with the skeleton oil seal.

2. The cutter head connection structure according to claim 1, characterized in that, The connector body has a lubricating layer between its contact surface and the oil seal skeleton.

3. The cutter head connection structure according to claim 1, characterized in that, The engineering plastic is ABS resin.

4. The cutter head connection structure according to claim 1, characterized in that, The connector body includes a handle connecting part, a blade connecting part, and an annular protrusion located between the handle connecting part and the blade connecting part.

5. The cutter head connection structure according to claim 4, characterized in that, The handle connecting part, the blade connecting part, and the annular protrusion are integrally formed.

6. The cutter head connection structure according to claim 4, characterized in that, The handle connecting part, the blade connecting part, and the annular protrusion are integrally formed using a mold injection molding process.

7. The cutter head connection structure according to claim 4, characterized in that, The skeleton oil seal includes a rigid skeleton and a rubber body. Both the rigid skeleton and the rubber body are annular, and an annular groove is provided between the rigid skeleton and the rubber body.

8. The cutter head connection structure according to claim 7, characterized in that, The deformation of the rubber body causes the annular groove to deform accordingly.

9. The cutter head connection structure according to claim 7, characterized in that, The rigid skeleton is covered with a rubber layer, which is integrally formed with the rubber body.

10. A wireless planer, characterized in that, The device includes the blade connection structure described in any one of claims 1-9, and further includes a handle housing and a planer blade, wherein one end of the blade connection structure is connected to the handle housing and the other end is connected to the planer blade.

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