Split type internal grinding head

Abstract

The embodiment of the utility model provides a split type internal grinding head, which comprises a grinding head shell, a grinding head, a grinding head, a grinding head, a grinding head, a driving device and a driving device, wherein the grinding head shell comprises an upper shell and a lower shell which are detachable; the bearing cavities are formed in the two ends of the grinding head shell and used for containing bearings; the main shaft penetrates through the center of the grinding head shell, is connected with a bearing in the bearing cavity and is used for transmitting torque and supporting grinding operation, and the main shaft is designed to be of a hollow structure so as to reduce the weight and improve the dynamic balance performance; the flange plate is installed at one end of the main shaft and used for being connected with a grinding tool, and the flange plate is connected with the main shaft through a key groove; the fixing bolt is used for connecting the upper shell and the lower shell; a lubricating oil groove is formed in the shell so that the lubricating effect can be achieved in the rotating process of the main shaft. According to the scheme, the defect that an existing grinding head cavity cannot be repaired due to abrasion can be overcome, and meanwhile the machining difficulty of the grinding head shell is lowered.

Description

Technical Field

[0001] This application relates to the field of grinding technology, specifically to a split-type internal grinding head. Background Technology

[0002] A split-type internal grinding head is a specialized component for internal grinding, primarily using rotary grinding to achieve precision surface treatment of the workpiece's internal surface. Under current technological conditions, these grinding heads generally face a technical challenge: once the grinding head cavity is worn, it is often difficult to repair, requiring complete replacement and increasing operating costs. Simultaneously, the complex machining process of the grinding head housing, demanding high manufacturing precision and material properties, further increases processing difficulty and production costs. This situation not only affects the grinding head's service life but also restricts its economic benefits in practical applications. Summary of the Invention

[0003] In view of this, the present disclosure provides a split-type internal grinding head, which at least partially solves the problems existing in the prior art.

[0004] This application discloses a split-type internal grinding head, comprising:

[0005] The grinding head housing includes a detachable upper housing and a lower housing;

[0006] Bearing cavities are located at both ends of the grinding head housing and are used to accommodate bearings;

[0007] The spindle runs through the center of the grinding head housing and is connected to the bearing in the bearing cavity. It is used to transmit torque and support grinding operations. The spindle adopts a hollow structure design to reduce weight and improve dynamic balance performance.

[0008] A flange is installed at one end of the spindle for connecting the mold; the flange and the spindle are connected by a keyway.

[0009] Fixing bolts are used to connect the upper housing and the lower housing;

[0010] The housing is equipped with a lubricating oil groove to lubricate the spindle during its rotation.

[0011] According to one embodiment, the connection between the upper housing and the lower housing is a sealing plane, so that the interior of the grinding head housing is sealed after assembly.

[0012] According to one embodiment, the lubricating oil grooves are arranged in a ring around the main shaft 3, and the lubricating oil grooves introduce lubricating oil from the external oil storage cavity through capillary action.

[0013] According to one embodiment, the number of fixing bolts is not less than four, and they are evenly distributed around the periphery of the grinding head housing.

[0014] According to one embodiment, a dust cover is designed on one side of the bearing cavity to prevent external dust particles from entering the bearing area.

[0015] According to one embodiment, the dust cover includes a cover plate and a sealing edge that can be pressed into the area surrounding the bearing cavity during assembly.

[0016] According to one embodiment, dynamic balance calibration marks are provided at both ends of the spindle for dynamic balance adjustment.

[0017] According to one embodiment, the flange surface has multiple sets of mounting holes to facilitate quick replacement of molds of different specifications.

[0018] This disclosure provides a split-type internal grinding head, comprising: a grinding head housing, including a detachable upper housing and a lower housing; bearing cavities disposed at both ends of the grinding head housing for accommodating bearings; a spindle extending through the center of the grinding head housing and connected to the bearings within the bearing cavities for transmitting torque and supporting grinding operations; the spindle employing a hollow structure design to reduce weight and improve dynamic balance performance; a flange mounted at one end of the spindle for connecting a grinding wheel; the flange and the spindle being connected via a keyway; fixing bolts for connecting the upper housing and the lower housing; and a lubricating oil groove provided inside the housing to lubricate the spindle during rotation. The solution provided by this disclosure addresses the issue of unrepairable wear in existing grinding head housings while reducing the machining difficulty of the grinding head housing. Attached Figure Description

[0019] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0020] Figure 1 This is a schematic diagram of the structure of a split-type internal grinding head according to the present invention;

[0021] Figure 2 This is an exploded schematic diagram showing the connection relationship between the grinding head housing and the fixing bolts in a split-type internal grinding head according to this utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the lower housing of a split-type internal grinding head according to the present invention;

[0023] Figure 4 This is an exploded schematic diagram showing the connection relationship between the flange and the spindle in a split-type internal grinding head according to this utility model.

[0024] Figure 5 This utility model describes a split-type internal grinding head. Figure 4 Enlarged view of point A in the middle.

[0025] In the diagram: 1. Grinding head housing; 11. Upper housing; 12. Lower housing; 13. Lubricating oil groove; 2. Bearing cavity; 21. Dust cover; 3. Spindle; 31. Keyway; 32. Dynamic balance calibration mark; 4. Flange; 41. Mounting hole Detailed Implementation

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] like Figures 1-5 As shown, a split-type internal grinding head according to this application includes the following components: grinding head housing 1, bearing cavity 2, spindle 3, flange 4, and fixing bolts. The specific structure and function of each component are described below.

[0028] The grinding head housing 1 consists of a detachable upper housing 11 and a lower housing 12, used to enclose the internal components of the grinding head and ensure that the mechanical stress during high-speed operation can be effectively withstood. By designing the housing as a split structure, the housing manufacturing process can be simplified, and convenience can be provided during later maintenance. Technically, the grinding head housing 1 can be precision machined using CNC machine tools, and the material is selected from high-strength alloy steel to ensure structural strength and wear resistance.

[0029] Bearing cavities 2 are located at both ends of the grinding head housing 1 (see details). Figure 2 A cavity with precise position and size is created on the grinding head housing 1 to accommodate the bearing, thereby enabling the spindle 3 to rotate stably. In practice, this can be achieved through boring or casting followed by secondary precision machining to create a bearing mounting space. To ensure the coaxiality of the bearing mounting, high-precision positioning fixtures or laser alignment technology can be used for machining verification.

[0030] The spindle 3 runs through the center of the grinding head housing 1 and connects to the bearing in the bearing cavity 2, undertaking the tasks of torque transmission and supporting the grinding operation. The spindle 3 can be manufactured through heat treatment and precision grinding technology to meet the rigidity and wear resistance requirements under high-speed operation. At the same time, in order to facilitate the connection between the spindle 3 and the bearing and improve the transmission efficiency, a tapered fit or involute spline connection can be adopted at the end of the spindle 3.

[0031] Flange 4 is installed at one end of spindle 3 (see details). Figure 4 This part is mainly used to achieve a stable connection with the grinding wheel. It is typically produced by forging a blank and then machining it to meet design requirements. In the actual manufacturing process, a suitable geometric shape and standard hole distribution need to be designed on the end face of the flange 4 to adapt to different grinding wheel interface requirements, such as using threaded fixing or changing the planar friction contact fit to a toothed meshing connection.

[0032] The fixing bolts are responsible for fastening the upper housing 11 and the lower housing 12 together, thereby ensuring the overall sealing and stability of the housing structure. To meet the requirements of high strength and reliability in connection, high-strength alloy bolts can be selected, along with locking washers and anti-loosening structures to prevent loosening due to vibration. In addition, during installation, the bolt preload can be kept consistent by controlling the torque.

[0033] This feature successfully solves the technical problems of unrepairable wear and high machining difficulty in existing grinding head housings. Firstly, the grinding head housing 1 adopts a split design, allowing the originally difficult-to-separate integrated grinding head structure to be transformed into a modular assembly of parts. This not only greatly simplifies the machining process and reduces manufacturing complexity but also provides significant flexibility for maintenance in actual use. When the bearing cavity 2 experiences severe wear or aging, it is not necessary to replace the entire housing unit; only local repair or direct replacement of the specific bearing cavity 2 is required, thus saving material costs and shortening maintenance time. Furthermore, because the grinding head housing 1 is divided into two relatively simple components for separate machining and assembly, the machining accuracy requirements in the overall manufacturing process are significantly reduced, ultimately achieving the goal of reducing production costs.

[0034] like Figure 2As shown, in one embodiment, the housing of a split-type internal grinding head of this application adopts a split design of upper housing 11 and lower housing 12. The key to this design is that the two housing parts are connected by a planar sealing surface. This connection method ensures a tight fit between the housings while also accommodating certain machining deviations, providing good assembly sealing performance. The design of the upper and lower housings 12 also facilitates the assembly and replacement of internal components, such as facilitating the inspection or replacement of components in the bearing cavity 2. In this way, not only is the assembly process simplified, but the overall reliability and practicality of the product are also improved.

[0035] For example, a high-precision machining method can be used to form the planar sealing surface at the joint of the two housings. Specifically, the mating surfaces of the upper and lower housings 12 are precision ground or polished, and their flatness and parallelism are checked using special tools to ensure that the sealing requirements are met. Subsequently, several fixing bolts are used to tighten the two housings from the outside to complete the pressure locking effect on the planar sealing surface, thereby achieving the stability of the entire grinding head structure and its waterproof and dustproof functions.

[0036] like Figure 3 As shown, in one embodiment, the housing of a split-type internal grinding head of this application is designed with a lubricating oil groove 13, which is located inside the housing near the rotation area of ​​the spindle 3. The lubricating oil groove 13 has a groove-like structure extending radially along the spindle 3, the purpose of which is to ensure that the spindle 3 is always covered with sufficient lubricating medium during high-speed rotation, thereby reducing friction and mechanical wear. Specifically, the gap between the lubricating oil groove 13 and the spindle 3 is small, and this small gap allows the lubricating oil to effectively enter between the spindle 3 and the bearing to form a stable lubricating oil film.

[0037] The lubricating oil grooves 13 can be directly formed by a casting process within the housing and are arranged in a ring around the main shaft 3. The lubricating oil grooves 13 introduce the lubricating medium from the oil reservoir through capillary action and then distribute it to the key contact areas around the main shaft 3.

[0038] Specifically, the lubricating oil groove 13 is connected to the external oil storage chamber by embedding porous fiber material (such as nylon rope or felt pad). When the lubricating oil in the oil storage chamber wets the fibers, capillary force drives the lubricating oil to continuously penetrate into the lubricating oil groove 13 along the fiber gaps. In this structure, the lubricating oil groove 13, the spindle 3, and the bearing together form a closed-loop circulating lubrication system, ensuring a stable and reliable lubrication process. In addition, the position of the lubricating oil groove 13 is arranged so that it does not affect the function and installation of other components such as fixing bolts, ensuring the integrity and compactness of the entire grinding head structure.

[0039] In one embodiment, the spindle 3 of a split-type internal grinding head of this application adopts a hollow structure design, which optimizes the overall weight distribution by adjusting the material distribution. This structure reduces the amount of material required for a solid spindle 3, while maintaining sufficient rigidity and strength through precise control of the wall thickness, thereby meeting the requirements for transmitting torque and supporting the grinding tool under high-speed rotation conditions. The spindle 3 is located at the center of the grinding head housing 1 and extends through the bearing cavities 2 at both ends. During high-speed rotation, the lightweight hollow structure significantly improves dynamic balance performance and reduces vibration generated during operation.

[0040] For example, the steel pipe profile can be precision machined using a CNC machine tool to form the spindle 3, ensuring that the wall thickness of the hollow section is uniformly distributed and meets strength requirements. Furthermore, to ensure the sealing and dustproof capabilities of the spindle 3, a special sealing ring can be installed at the opening of the hollow section, and a reinforcing structure can be installed at the connection point between one end of the spindle 3 and the flange 4 to distribute stress, further ensuring overall reliability. Specifically, the internal space of the hollow spindle 3 can also serve as a carrier for wiring or cooling medium channels, enhancing the functional integration of the grinding head.

[0041] like Figure 5 As shown, in one embodiment, the flange 4 and spindle 3 of a split-type internal grinding head of this application achieve precise torque transmission via a keyway 31. This connection method ensures that the spindle 3 can effectively transmit power to the flange 4 when rotating at high speed, and further to the grinding wheel mounted thereon, guaranteeing stability and accuracy during the grinding process. The keyway 31 is designed to be located at one end of the spindle 3, where the flange 4 is tightly nested. The flange 4 is tightly mounted on the surface of the spindle 3 via the keyway 31, and the connection between the two is firm and well-aligned, effectively avoiding power loss or structural loosening caused by relative sliding.

[0042] For example, a straight keyway 31 at one end of the spindle 3 and a matching keyway 31 inside the flange 4 can be formed using precision machining. Specifically, the dimensions and position of the keyway 31 should meet relevant mechanical design standards to ensure that the connecting components can still function normally under high torque. After the flange 4 and the spindle 3 are connected via the keyway 31, bolts are used for further tightening, making the overall structure more stable. This design not only facilitates assembly and disassembly but also supports the replacement of flanges 4 of various specifications.

[0043] like Figure 2As shown, in one embodiment, the fixing bolt connection method of the split-type internal grinding head of this application is an important design for achieving the structural stability of the grinding head housing 1. The fixing bolts are distributed at specific positions around the periphery of the grinding head housing 1 to securely connect the upper housing 11 and the lower housing 12, ensuring the sealing and stability of the split structure under high mechanical stress conditions. The number of fixing bolts is no less than four. This design not only provides sufficient connection strength but also ensures uniform torque distribution, avoiding loosening of connections or deformation of components caused by uneven local stress. Specifically, the fixing bolts are arranged around the periphery of the grinding head housing 1 and mate with corresponding holes on the upper housing 11 and the lower housing 12.

[0044] For example, precision machining techniques can be used to determine the 41 mounting holes and spacing of the fixing bolts, ensuring that the positions of each fixing bolt meet the requirement of uniform distribution. Simultaneously, during actual assembly, the connection effect of the fixing bolts to the housing is further optimized by controlling the tightening torque, ensuring that it can maintain a stable connection state over a long period under high-speed operation and complex load conditions.

[0045] In one embodiment, the grinding head housing 1 of the split-type internal grinding head of this application is made of high-strength alloy steel to ensure that it can meet the mechanical performance requirements under complex working conditions. The grinding head housing 1 is the basic structural component of the entire grinding head, consisting of a detachable upper housing 11 and a lower housing 12. It not only undertakes the task of encapsulating the internal precision components, but also must have sufficient wear resistance and impact resistance to cope with the mechanical stress under high-speed rotation and heavy load conditions. In addition, the design of the grinding head housing 1 must take into account both structural stability and ease of maintenance, and the selection of appropriate materials is a key factor in achieving this design requirement.

[0046] Specifically, high-strength alloy steels selected in practice can be of grades with excellent comprehensive mechanical properties, such as alloy steels containing elements like chromium or nickel. After appropriate heat treatment, these materials can enhance the surface hardness of the grinding head housing 1 while retaining sufficient toughness, ensuring the component maintains reliability under extreme conditions. For example, during manufacturing, the grinding head housing 1 can be formed through a combination of casting, forging, and subsequent precision machining, supplemented by appropriate surface strengthening treatments such as quenching or nitriding, thereby achieving optimized wear resistance and impact resistance. Therefore, the overall design from material selection to processing technology directly affects the performance of the grinding head.

[0047] like Figures 1-4As shown, in one embodiment, a dust cover 21 is designed on one side of the bearing cavity 2 of a split-type internal grinding head according to this application. The dust cover 21 is installed on the outside of the bearing cavity 2 and fits tightly with the grinding head housing 1. Specifically, the dust cover 21 forms surface contact with the grinding head housing 1 through its edge, thereby effectively preventing external dust particles from entering the interior of the bearing cavity 2. At the same time, the dust cover 21 can be made of flexible or rigid materials to adapt to different environmental requirements.

[0048] The dust cover 21 comprises a main cover and a sealing edge that is pressed against the area surrounding the bearing cavity 2 during assembly to ensure a good seal. To ensure a secure installation, the dust cover 21 is further connected to the grinding head housing 1 using fasteners or snap-fits to prevent loosening caused by high-speed operation of the equipment. Furthermore, the design of the dust cover 21 must adequately consider reasonable clearance from the flange 4 and the spindle 3 to avoid interference with other components.

[0049] For example, the dust cover 21 can be a metal cover with a ring of elastic rubber. During assembly, the elastic rubber ring is inserted into the groove at the junction of the grinding head housing 1 and the bearing cavity 2. In this way, the compression deformation of the elastic rubber ring completes the initial positioning, and the connection reliability is further enhanced by combining it with fixing methods such as screws.

[0050] like Figure 4 and Figure 5 As shown, in one embodiment, the spindle 3 of a split-type internal grinding head of this application is provided with dynamic balance calibration marks 32 at both ends. By adding clearly visible marks at both ends of the spindle 3, dynamic balance adjustment can be conveniently performed during actual assembly or maintenance. Dynamic balance adjustment is a key process to ensure smooth operation of high-speed rotating equipment and reduce vibration. The dynamic balance calibration marks 32 are located on the part of the spindle 3 extending to the outside of the grinding head housing 1, which facilitates the operator to quickly locate and perform relevant adjustment steps. This mark design significantly improves debugging efficiency without the need for additional complex devices.

[0051] During the machining of spindle 3, a clear mark can be formed by engraving or laser etching, while ensuring that the mark does not affect the structural strength and surface accuracy of spindle 3 itself. This mark is a ring design, combined with a fixed-angle marker, making it easy for measuring equipment to read and for operators to align with reference points. This rational layout of structural features simplifies dynamic balancing adjustments, thus adapting to higher-frequency assembly and maintenance needs.

[0052] like Figure 4 and Figure 5As shown, in one embodiment, the flange 4 of a split-type internal grinding head of this application is located at one end of the spindle 3 and serves as the core component for connecting the grinding wheel. The flange 4 secures the grinding wheel through a mechanical structure and meets the need for quick replacement of grinding wheels of different specifications through multiple sets of mounting holes 41 on its surface. The number and position of these mounting holes 41 can be optimized and adjusted according to specific design requirements, thereby ensuring compatibility with grinding wheel interfaces of various standard sizes. This design not only provides a flexible assembly method but also avoids the problem of redesigning the flange 4 due to changes in grinding wheel specifications, thus enhancing the applicability of the grinding head.

[0053] To ensure reliable connection, flange 4 and spindle 3 are connected via a tight fit or other fixing methods, maintaining concentricity and rigidity during high-speed operation. Technically, the connection between flange 4 and spindle 3 can be achieved through processes such as threads, splines, or press-fit locking nuts. Precise positioning and machining of the multiple mounting holes 41, along with material property matching, further enhance overall stability and durability. The specific implementation of this solution will be based on selecting appropriate process parameters and manufacturing methods according to actual operating conditions.

[0054] In actual operation, when this device is in use, the grinding wheel can be fixed on the flange 4, and then the relevant drive equipment can be started to make the spindle 3 start to rotate. Under the drive of the spindle 3, the grinding wheel realizes the grinding process on the workpiece. The bearing set in the bearing cavity 2 provides support for the stable rotation of the spindle 3, ensuring the overall stability of the device during high-speed operation. The grinding head housing 1 is composed of an upper housing 11 and a lower housing 12 connected by fixing bolts. When it is necessary to maintain the worn bearing cavity 2, the fixing bolts can be loosened and the upper housing 11 and the lower housing 12 can be separated to easily remove the components in the bearing cavity 2 to replace or repair the damaged parts. This design simplifies the maintenance process and reduces the additional costs caused by replacing the whole unit. The whole process realizes efficient and stable grinding operation and convenient maintenance function.

[0055] This document describes several embodiments of the present invention; however, for the sake of brevity, the descriptions of the embodiments are not exhaustive, and identical or similar features or parts between the embodiments may be omitted. In this document, "one embodiment," "some embodiments," "example," "specific example," or "some examples" refers to embodiments applicable to at least one, but not all, of the present invention. The above terms do not necessarily refer to the same embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of the different embodiments or examples.

[0056] The exemplary systems and methods of the present invention have been specifically shown and described with reference to the above embodiments, which are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments of the systems and methods described herein without departing from the spirit and scope of the invention as defined in the appended claims when implementing the systems and / or methods.

Claims

1. A split-type internal grinding head, characterized in that, include: The grinding head housing (1) includes a detachable upper housing (11) and a lower housing (12); Bearing cavities (2) are located at both ends of the grinding head housing (1) and are used to accommodate bearings; The spindle (3) passes through the center of the grinding head housing (1) and is connected to the bearing in the bearing cavity (2) to transmit torque and support grinding operations. The spindle (3) adopts a hollow structure design to reduce weight and improve dynamic balance performance. A flange (4) is installed at one end of the spindle (3) for connecting the grinding wheel. The flange (4) and the spindle (3) are connected by a keyway (31). Fixing bolts (5) are used to connect the upper housing (11) and the lower housing (12); The housing (1) is provided with a lubricating oil groove (13) to achieve lubrication during the rotation of the main shaft (3).

2. The split-type internal grinding head according to claim 1, characterized in that: The connection between the upper housing (11) and the lower housing (12) is a sealing plane, so that the interior of the grinding head housing (1) is sealed after assembly.

3. The split-type internal grinding head according to claim 1, characterized in that: The lubricating oil groove (13) is arranged in a ring around the main shaft (3), and the lubricating oil groove (13) introduces lubricating oil from the external oil storage cavity through capillary action.

4. A split-type internal grinding head according to claim 1, characterized in that: The number of fixing bolts (5) is not less than four, and they are evenly distributed around the periphery of the grinding head housing (1).

5. A split-type internal grinding head according to claim 1, characterized in that: A dust cover (21) is designed on one side of the bearing cavity (2) to prevent external dust particles from entering the bearing part.

6. A split-type internal grinding head according to claim 5, characterized in that: The dust cover (21) includes a cover plate and a sealing edge that can be pressed into the area around the bearing cavity (2) during assembly.

7. A split-type internal grinding head according to claim 1, characterized in that: The main shaft (3) is provided with dynamic balance calibration marks (32) at both ends for dynamic balance adjustment.

8. A split-type internal grinding head according to claim 1, characterized in that: The flange (4) has multiple sets of mounting holes (41) on its surface to facilitate quick replacement of molds of different specifications.

Images