A curved surface part polishing device

Abstract

The utility model provides a curved surface part polishing device, including device body, the inside bottom end of device body is installed with drive motor, drive motor output end penetrates device body bottom end surface and is connected with the mounting seat, the bottom end surface fixed with the sponge piece of mounting seat, the outer side of sponge piece is wrapped and is fixed with polishing sand paper, the outer side screw joint of mounting seat has the limit cover, the utility model discloses through drive motor and drives mounting seat rotation, cooperation mounting seat bottom end fixed sponge piece and the outer side wrapping of polishing sand paper, solved the problem that conventional disc type or plane zonal polishing device is difficult to adapt curved surface part. The sponge piece has good flexibility and adhesion, can adjust with the part curved surface form self -adaptation, ensure that the polishing sand paper and the curved surface surface layer contact fully, realized the even polishing of curved surface part surface layer, polished to ideal state, and through motor drive's high -efficient rotation replaces manual operation, polishing work efficiency is improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of polishing technology for curved parts, and in particular to a polishing device for curved parts. Background Technology

[0002] In the structure of related mechanical equipment, there are often a large number of curved surface parts, such as the blades of a worm gear engine. During the manufacturing process, the curved surface of these parts needs to be ground or polished.

[0003] For the surface treatment of the aforementioned "curved surface parts", if conventional disc grinding devices or flat strip grinding devices are used for grinding or polishing, it is often difficult to grind the curved surface of the parts to the ideal state and fully guarantee its working efficiency.

[0004] Therefore, it is necessary to provide a grinding device for curved parts to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a grinding device for curved parts, which solves the problems in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a surface grinding device for curved parts, including a device body. A drive motor is fixedly installed at the bottom of the device body. The drive motor is located in the bottom area of ​​the device body and is connected to an internal power supply component through wires to provide rotational power to the device. The output end of the drive motor passes through the bottom surface of the device body and is fixedly connected to a mounting base. The mounting base is located on the lower part of the device body, and its top end is coaxially fixed with the motor output end. When the motor is running, it can directly transmit rotational power to the mounting base. A sponge block is fixed to the bottom surface of the mounting base. The sponge block has a cylindrical structure, and its central axis coincides with the mounting base. It is fixed to the bottom of the mounting base. Its flexible material can adapt to the shape of curved parts. Sandpaper is wrapped and fixed to the outside of the sponge block. The sandpaper completely covers the outer surface of the sponge block and moves synchronously with the sponge block. It achieves grinding by friction with the curved surface of the part. The outer side of the mounting base is spirally connected to a limiting cover. The limiting cover is sleeved on the outside of the mounting base and fixed by thread engagement. It can move along the axial direction of the mounting base and squeeze and fix the sandpaper to prevent the sandpaper from rotating and falling off.

[0007] Preferably, a pressure plate is fixedly installed at one end of the limiting cover. The pressure plate is located at the end of the limiting cover facing the sponge block, and its central axis is consistent with the limiting cover and the mounting base. It is fixed synchronously with the limiting cover. Anti-slip protrusions are adhered to the outer surface of the pressure plate. The anti-slip protrusions are evenly distributed in the gripping area of ​​the outer surface of the pressure plate, which can increase the friction with the hand or external clamp. When grinding, the pressure plate can conform to the non-grinding area of ​​the part to assist in positioning and prevent the part from shifting. The anti-slip protrusions improve the gripping stability and prevent slippage during operation.

[0008] Preferably, the inner side of the limiting cover is integrally formed with an internal thread (the internal thread is distributed axially along the inner wall of the limiting cover, covering a specified length area), and the outer side of the mounting base is integrally formed with an external thread (the external thread is distributed axially along the outer wall of the mounting base, corresponding to the position of the internal thread and matching its size). The limiting cover and the mounting base are spirally connected by the engagement of the internal and external threads. The threaded structure allows the limiting cover to be flexibly disassembled and installed, facilitating the replacement of sandpaper or sponge blocks. At the same time, by rotating and adjusting the position of the limiting cover, the squeezing force on the sandpaper can be changed, balancing the fixing effect and the flexibility of the sponge block.

[0009] Preferably, the sponge block has a cylindrical structure, and the diameter of the cross-section of the sponge block is smaller than the diameter of the cross-section of the mounting base (after the sponge block is fixed to the bottom of the mounting base, the edge of the mounting base forms an annular protrusion); this structure allows the mounting base to initially limit the edge of the sandpaper, preventing the sandpaper from shifting during installation. At the same time, the smaller diameter sponge block is more prone to flexible deformation, improving the fit between the sandpaper and the curved parts.

[0010] Preferably, the inner diameter of the pressure plate is equal to the outer diameter of the sponge block, and the inner edge of the pressure plate can be precisely fitted with the outer edge of the sponge block; this size matching ensures that the pressure of the pressure plate on the sandpaper is evenly distributed on the edge of the sandpaper, avoiding excessive local pressure that could cause the sandpaper to break or the sponge block to deform unevenly, and further ensuring the stability of the sandpaper.

[0011] Preferably, a top cover is detachably connected to the top surface of the device body. The top cover completely covers the top opening of the device body to provide dust protection. A drive handle is fixedly installed on the top surface of the top cover. The drive handle is fixed vertically or at an angle to the top of the top cover and is located in a position that is convenient for the operator to hold. The top cover is detachable to facilitate the maintenance of internal components, and the drive handle provides the operator with a stable grip point, making it easy to adjust the grinding angle and force, and reducing operator fatigue.

[0012] Preferably, a top cover is detachably connected to the top surface of the device body. The top cover completely covers the top opening of the device body to provide dust protection. A drive handle is fixedly installed on the top surface of the top cover. The drive handle is fixed vertically or at an angle to the top of the top cover and is located in a position that is convenient for the operator to hold. The top cover is detachable to facilitate the maintenance of internal components, and the drive handle provides the operator with a stable grip point, making it easy to adjust the grinding angle and force, and reducing operator fatigue.

[0013] Compared with related technologies, the grinding device for curved parts provided by this utility model has the following advantages: Compared to existing technologies, this method solves the problem of conventional disc or flat strip sanding devices being difficult to adapt to curved parts by using a drive motor to rotate the mounting base. This, combined with a sponge block fixed to the bottom of the mounting base and sandpaper wrapped around its outer surface, addresses the challenge of adapting to curved parts. The sponge block possesses excellent flexibility and conformability, adaptively adjusting to the curved surface shape of the part to ensure full contact between the sandpaper and the curved surface. This achieves uniform sanding of the curved surface, bringing it to an ideal state, and the efficient rotation driven by the motor replaces manual operation, significantly improving sanding efficiency. Furthermore, the spiral connection between the mounting base and the limiting cover facilitates the subsequent disassembly and replacement of the sponge block or sandpaper, reducing maintenance costs.

[0014] Compared to existing technologies, the pressure plate installed at one end of the limiting cover effectively compresses and fixes the sandpaper during the assembly stage, significantly improving the stability of the sandpaper during sanding. When the sandpaper is wrapped around the outside of the sponge block, and the limiting cover is screwed to the external thread of the mounting base via its internal thread, the limiting cover drives the pressure plate to gradually move towards the mounting base. This allows the pressure plate to pass through the edge of the sandpaper and fit against the bottom edge of the mounting base, creating uniform compression on the sandpaper. Because the inner diameter of the pressure plate is equal to the outer diameter of the sponge block, the compressive force can be precisely applied to the contact surface between the sandpaper and the sponge block, preventing localized loosening or wrinkling of the sandpaper. This compression and fixing structure effectively prevents the sandpaper from shifting or falling off due to centrifugal force generated by the motor's rotation during sanding, ensuring that the sandpaper remains tightly fitted to the sponge block. This guarantees consistent contact between the sandpaper and the curved surface of the part, reducing problems such as uneven sanding patterns and missed areas caused by loose sandpaper.

[0015] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a grinding device for curved parts provided by this utility model; Figure 2 A schematic diagram of the internal structure of a grinding device for curved parts provided by this utility model; Figure 3 A schematic diagram of the limiting cover structure of a grinding device for curved parts provided by this utility model; Figure 4 A schematic diagram of the sandpaper structure of a surface grinding device provided by this utility model.

[0017] Numbering on the map: 1. Device body; 2. Top cover; 3. Drive handle; 4. Control button; 5. Limit cover; 6. Sandpaper; 7. Sponge block; 8. External thread; 9. Drive motor; 10. Battery; 11. Mounting base; 12. Pressure plate; 13. Anti-slip protrusions; 14. Internal thread. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example 1 Please refer to the following: Figure 1-4 A grinding device for curved parts includes a device body 1. The device body 1 has a drive motor 9 installed at its bottom. The drive motor 9 is fixed to a mounting bracket pre-set on the inner wall of the device body 1 by bolts, ensuring no displacement during operation. Its output end vertically penetrates a through hole on the bottom surface of the device body 1, and the outer wall of the output end and the inner wall of the through hole are fitted by a sealed bearing, ensuring both rotational flexibility and preventing dust from entering the interior. The end of the drive motor 9 furthest from the body is connected to a mounting base 11 by a key, transmitting torque through the key. Simultaneously, the top of the mounting base 11 is locked to the output end with a nut, forming a stable integrated structure, allowing the motor to synchronously drive the mounting base 11 to rotate. The bottom surface of the mounting base 11 has an annular groove. The top of the sponge block 7 is embedded in this groove and is bonded to the bottom of the mounting base 11 with high-strength adhesive to prevent relative slippage during rotation. The outer side of the sponge block 7 is wrapped with sandpaper 6. The two ends of the sandpaper are closed with Velcro to form an annular structure, which facilitates adjustment of the tightness of the wrapping and ensures stability. The outer side of the mounting base 11 has an external thread 8, and the inner side of the limiting cover 5 has an adaptable internal thread 14. The two are connected by threaded engagement. Rotating the limiting cover 5 allows it to move axially along the mounting base 11. When tightened to the designated position, the bottom end of the limiting cover 5 fits against the edge of the sandpaper, forming axial compression on the sandpaper and preventing the sandpaper from falling off during high-speed rotational sanding. In the overall structure, the drive motor 9 serves as the power source and transmits power through key connection and locking. The mounting base 11 serves as the carrier to fix the sponge block 7, sandpaper, and connect the limiting cover 5. The sponge block 7, with its flexible adaptable curved surface, allows the sandpaper to fully contact the parts. The limiting cover 5 fixes the sandpaper through threaded engagement. All components work together to achieve efficient and uniform sanding of curved parts.

[0020] Example 2 Please refer to the following: Figure 1-4The limiting cover 5 has a pressure plate 12 installed at one end. The pressure plate 12 is fixed to the end of the limiting cover 5 by welding. The welding points are evenly distributed along the circumference of the pressure plate 12 to ensure connection strength and prevent vibration from causing it to fall off. The outer surface of the pressure plate 12 is covered with anti-slip rubber protrusions 13, which are evenly arranged with high-temperature resistant adhesive. The protrusions are hemispherical and have uniform gaps between adjacent ones, taking into account both grip comfort and friction. During the grinding operation, the pressure plate 12 is fixed by the spiral connection between the limiting cover 5 and the mounting base 11. The operator can press the pressure plate 12 against the non-grinding area or edge of the part and apply slight pressure to assist in positioning, counteract the vibration of the motor rotation, prevent the part from shifting, and ensure grinding accuracy. The anti-slip protrusions 13 can increase the friction with the hand and prevent slippage. If used with an external fixing fixture, it can also enhance the friction between the pressure plate 12 and the fixture, improve the stability of the device, and optimize the operation safety and positioning effect.

[0021] Example 3 Please refer to the following: Figure 1-4 The inner side of the limiting cover 5 is provided with an internal thread 14, which is formed on the inner wall of the limiting cover 5 through a threading process. The tooth profile is triangular, and the length is adapted to the external thread 8 on the outer side of the mounting base 11 to ensure sufficient engagement length and improve connection stability. The outer side of the mounting base 11 is provided with an external thread 8, which is also formed through threading. The pitch and tooth profile are completely consistent with the internal thread 14 to ensure precise engagement and avoid jamming or loosening. The spiral connection between the two is a detachable mechanical fit. The installation sequence is to first fix the sponge block 7 and the sandpaper, then align the internal thread 14 of the limiting cover 5 with the external thread 8 of the mounting base 11 and rotate it clockwise to move it toward the sponge block 7 to fit the sandpaper and form a squeezing force. When disassembling, it can be removed by rotating counterclockwise, which is convenient for replacing the worn sponge block 7 or sandpaper, reducing maintenance costs. The squeezing force can also be changed by adjusting the degree of rotation. After the sandpaper is worn, tightening it appropriately can compensate for the reduction in thickness, ensuring that the sandpaper is always in close contact with the sponge block 7 and ensuring consistent sanding effect.

[0022] Example 4 Please refer to the following: Figure 1-4 The sponge block 7 has a cylindrical structure, and its axial length is adapted to the mounting base 11 to ensure a reasonable grinding contact length after fixing. Furthermore, the diameter of the circular cross-section of the sponge block 7 is smaller than that of the mounting base 11, creating an annular step at the bottom of the mounting base 11. The width of the step is adapted to the thickness of the sandpaper. When the sandpaper wraps around the sponge block 7, its top naturally rests on the annular step. The step provides initial axial restraint for the sandpaper, preventing it from slipping during installation and also providing a reference surface for the pressure and fixing of the limiting cover 5. The smaller diameter of the sponge block 7 reduces the contact area with the mounting base 11, allowing for greater deformation space when compressed by the curved surface of the part. This better conforms to the curvature changes of the curved surface, avoiding the rigid structure of the mounting base 11 restricting deformation, ensuring that the sandpaper fully covers the curved surface of the part for thorough grinding without dead angles, and improving grinding quality.

[0023] Example 5 Please refer to the following: Figure 1-4 The inner diameter of the pressure plate 12 is equal to the outer diameter of the sponge block 7, and the axial thickness of the pressure plate 12 matches the wall thickness of the limiting cover 5, ensuring overall structural coordination after installation. The inner edge of the pressure plate 12 is chamfered to prevent scratching the sandpaper or the surface of the parts. This dimensional fit ensures that the inner edge of the pressure plate 12 precisely fits the outer edge of the sponge block 7 after tightening, distributing the force evenly across the mating surface when squeezing the sandpaper. Excessive local pressure will not damage the sandpaper, nor will insufficient pressure cause loosening. Simultaneously, it ensures that the pressure plate 12 covers a reasonable area of ​​the sponge block 7, avoiding both excessive diameter (which prevents effective squeezing) and excessive diameter (which causes excessive deformation of the sponge block 7 and affects flexible fit). This maintains the sponge block 7's ability to adapt to curved surfaces while ensuring stable sandpaper fixation.

[0024] Example 6 Please refer to the following: Figure 1-4 The device body 1 has a top cover 2 mounted on its top surface. The top cover 2 and the device body 1 are fastened together with a snap-fit ​​mechanism. The top edge of the device body 1 has an annular groove, and the bottom of the top cover 2 has a matching elastic buckle. During installation, after alignment, pressing down allows the buckle to engage with the groove for quick fixation. During disassembly, pinching the protruding edge of the top cover 2 and pulling upwards allows it to be detached, facilitating the inspection and maintenance of internal components. A drive handle 3 is mounted on the top surface of the top cover 2. The handle is made of plastic and is integrally molded with the top cover 2. Its shape is ergonomic and its surface has anti-slip textures, making it easy to hold for extended periods. The top cover 2 serves as a protective component, preventing dust and debris from entering the device and protecting components such as the drive motor 9 and the battery 10, thus extending their service life. The drive handle 3 provides a convenient grip for the operator, allowing easy adjustment of the grinding angle, force, and position. It avoids direct hand contact with the device and the impact of vibration. The ergonomic design and anti-slip textures reduce grip fatigue, improve operational stability, and ensure grinding accuracy and work efficiency.

[0025] Example 7 Please refer to the following: Figure 1-4The outer surface of the device body 1 is equipped with a control button 4, which is connected to the internal circuit board via a wire. The mounting hole is located in the middle of the outer wall of the device body 1 and below the drive handle 3, making it easy for fingers to reach when holding the device. The button shell is made of waterproof material and is sealed to the device body 1 with a sealing ring to prevent debris or coolant from entering. A storage battery 10 is installed inside the device body 1 and is fixed in the internal space by a plastic bracket. The bracket is bolted to the inner wall of the body. The positive and negative terminals of the storage battery 10 are connected to the circuit board and the drive motor 9 respectively via wires to form a power supply circuit. The storage battery 10 serves as a portable power source to provide stable power to the motor, freeing the device from the limitation of external power supply and adapting to different working scenarios. The control button 4 acts as a switch; pressing it connects the circuit and starts the motor, while releasing it disconnects the motor and stops it, enabling real-time control of the grinding operation and facilitating adjustment of the working status. The waterproof seal and the fixed design of the storage battery 10 ensure stable operation of the device in complex grinding environments, avoiding malfunctions or loss of control caused by external factors. All components work together to achieve safe and convenient operation.

[0026] It should be noted that the controller control circuit can be implemented by those skilled in the art through simple programming, and is common knowledge in the field. It is only used and not modified, so the control method and circuit connection will not be described in detail.

[0027] The working principle of the curved surface grinding device provided by this utility model is as follows: First, the battery 10 inside the device body 1 provides power to the drive motor 9. The operator needs to select the appropriate sandpaper 6 according to the characteristics of the curved surface part to be polished, and wrap the sandpaper around the cylindrical sponge block 7 at the bottom of the mounting base 11. Because the cross-sectional diameter of the sponge block 7 is smaller than that of the mounting base 11, the mounting base 11 can initially limit the edge of the sandpaper. Then, the limiting cover 5 is screwed to the outer external thread 8 of the mounting base 11 through the inner internal thread 14. During the tightening process, the pressure plate 12 at one end of the limiting cover 5 will pass through the edge of the sandpaper and gradually approach the sponge block 7 until the pressure plate 12 is in contact with the bottom edge of the mounting base 11. The pressure plate 12 forms a uniform pressure on the sandpaper, so that the sandpaper is firmly fixed on the sponge block 7 (and the inner diameter of the pressure plate 12 is equal to the outer diameter of the sponge block 7 to ensure uniform pressure distribution and avoid sandpaper wrinkles). Then, the operator... The operator holds the drive handle 3 on the top of the device body 1, aligns the sponge block 7 wrapped with sandpaper with the curved surface of the part to be sanded, and makes the flexible sponge block 7 adapt to the shape of the curved surface. Press the control button 4 on the outside of the device to start the drive motor 9. The motor output drives the mounting base 11, sponge block 7 and sandpaper to rotate synchronously. The rotating sandpaper generates friction with the surface of the curved surface of the part to achieve sanding or polishing. During this process, the operator can hold the outside of the pressure plate 12 (with the help of the anti-slip protrusions 13 on the surface to increase friction and prevent hand slippage) to place the pressure plate 12 against the non-sanding area of ​​the part for auxiliary positioning, counteract the vibration generated by the motor rotation, prevent the part from shifting, and ensure sanding accuracy. After sanding is completed, turn off the control button 4 to stop the motor, rotate the limit cover 5 in the opposite direction to remove and replace the sandpaper or sponge block 7, clean the device debris, and complete the entire operation process.

[0028] It should be noted that all components used in this application are standard parts that can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets and welding that are mature in the prior art. The mechanical parts and electrical equipment adopt conventional models in the prior art. The circuit connection adopts conventional connection methods in the prior art. The electrical equipment is connected to an external safe power source. These will not be described in detail here.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A grinding device for curved parts, comprising a device body (1), characterized in that, The device body (1) is equipped with a drive motor (9) at the bottom. The output end of the drive motor (9) passes through the bottom surface of the device body (1) and is connected to a mounting base (11). A sponge block (7) is fixed on the bottom surface of the mounting base (11). Sandpaper (6) is wrapped and fixed on the outside of the sponge block (7). A limit cover (5) is spirally connected to the outside of the mounting base (11).

2. The grinding device for curved parts according to claim 1, characterized in that, The limiting cover (5) is equipped with a pressure plate (12) at one end, and anti-slip protrusions (13) are attached to the outer surface of the pressure plate (12).

3. The grinding device for curved parts according to claim 1, characterized in that, The limiting cover (5) has an internal thread (14) on its inner side, and the mounting base (11) has an external thread (8) on its outer side. The limiting cover (5) and the mounting base (11) are spirally connected.

4. The grinding device for curved parts according to claim 1, characterized in that, The sponge block (7) has a cylindrical structure, and the diameter of the cross-section of the sponge block (7) is smaller than the diameter of the cross-section of the mounting base (11).

5. A grinding device for curved parts according to claim 2, characterized in that, The inner diameter of the pressure plate (12) is equal to the outer diameter of the sponge block (7).

6. The grinding device for curved parts according to claim 1, characterized in that, The device body (1) has a top cover (2) mounted on its top surface, and a drive handle (3) is mounted on the top surface of the top cover (2).

7. The grinding device for curved parts according to claim 1, characterized in that, The device body (1) has a control button (4) installed on its outer surface, and a storage battery (10) is installed inside the device body (1).

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