A speaker shell polishing system
By combining a six-joint industrial robot with a CNC grinding module, the problems of low efficiency and low yield rate of manual grinding of speaker shells have been solved, achieving efficient and stable automated grinding results and ensuring high-quality pre-painting treatment of speaker shells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU JINSHAN ELECTRONICS
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-31
AI Technical Summary
Manually polishing speaker casings presents challenges such as high uncertainty, low efficiency, and low product yield. In particular, it is difficult to achieve a smooth transition at rounded corners or curved surfaces, resulting in poor paint finish and increasing the risk of rework.
A six-joint industrial robot, along with tooling fixtures and a CNC grinding module, is used to automate the grinding of speaker shells. The tooling fixtures use cylinders and limit plates for stable gripping, the CNC grinding module uses adjustable sanding belts for precise grinding, and a secondary positioning bracket ensures accurate workpiece positioning.
It improves grinding efficiency and yield, reduces the uncertainty of manual operation, ensures the consistency and precision of grinding quality, extends the service life of the sanding belt, and reduces production costs.
Smart Images
Figure CN224575329U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a polishing system, and more particularly to a speaker shell polishing system. Background Technology
[0002] Wooden speaker cabinets, after being assembled from wooden boards, generally require painting to enhance their appearance. The painting process typically involves three coats of primer and one (or two) coats of topcoat. Therefore, the primer needs to be sanded three times. Manual sanding is inherently unpredictable; achieving a smooth transition on rounded corners or curved surfaces is difficult, easily resulting in uneven sanding or even sagging. If the primer isn't sanded properly, subsequent coats will likely produce unsatisfactory results. The third sanding step, in particular, must be smooth and even; otherwise, oil buildup, uneven surfaces, and exposed substrate may occur when applying the topcoat, leading to rework.
[0003] Chinese Patent No. CN221111081U discloses a speaker shell grinding fixture. This fixture can design a workpiece contour structure to position the speaker shell on one side of the horizontal direction according to the characteristics of the product. It can also rotate the speaker shell by rotating the structure and then use the abutment on the corresponding first or second cylinder to position the speaker shell on the other side of the horizontal direction. This facilitates the switching between grinding the upper and lower outer surfaces of the speaker shell and ensures the stability during grinding.
[0004] Manual polishing can lead to poor polishing results, low efficiency, and low product yield due to unstable operation and uneven force. To achieve better speaker painting results, reduce rework, minimize waste, and improve production efficiency, a speaker shell polishing system has been developed to enhance workshop automation and productivity, improve the working environment for workers, increase product processing consistency, and improve product quality. Utility Model Content
[0005] The main objective of this invention is to provide a speaker shell polishing system to solve the problems raised in related technologies.
[0006] To achieve the above objectives, according to one aspect of the present invention, a speaker shell polishing system is provided, comprising an installation platform fixedly installed in a dustproof room, a loading and unloading rack fixedly installed on the installation platform, trays for placing and transporting speaker shells symmetrically slidably installed on the loading and unloading rack, a six-joint industrial robot fixedly installed on the installation platform, and a tooling fixture fixedly installed at the end of the robotic arm of the six-joint industrial robot for gripping the speaker shell; The installation platform is also fixedly equipped with a secondary positioning bracket and a support frame. Two CNC grinding modules are symmetrically arranged on one side of the support frame. Each CNC grinding module includes at least a number of rotating polishing wheels. The outer wall of each polishing wheel is provided with a sanding belt, which meshes with the polishing wheel. The sanding belt is used to polish the speaker housing.
[0007] Furthermore, two sets of guide rails are symmetrically provided on the loading and unloading rack, both ends of the tray are slidably mounted on the guide rails, and a positioning material is fixedly provided on the top of the tray, and the speaker shell is placed on the positioning material.
[0008] Furthermore, a positioning pin is movably provided at the bottom of the tray, and an automatic door is fixedly provided on the loading and unloading rack.
[0009] Furthermore, two partitions are vertically fixedly arranged inside the speaker housing, and a mounting groove is provided at the connection point of the two partitions.
[0010] Furthermore, the tooling fixture includes a mounting flange, one end of which is fixedly connected to the end of the robotic arm of a six-joint industrial robot, and the other end of which is fixedly connected to a cylinder, with limit plates fixedly connected to the output shafts at both ends of the cylinder.
[0011] Furthermore, when the six-joint industrial robot is driven to use the tooling fixture to grip the speaker housing, the cylinder contacts the bottom of the mounting groove, and the two limiting plates are located at two opposite corners of the speaker housing.
[0012] Furthermore, the secondary positioning bracket includes a fixed base fixedly mounted on the installation platform, a plurality of connecting rods fixedly mounted on the fixed base, a support frame fixedly mounted on the connecting rods, the support frame being inclined, and the support frame being composed of a plurality of mutually perpendicular rectangular plates.
[0013] Furthermore, the CNC grinding module also includes fixed blocks symmetrically fixed on both sides of the support frame, and a fixed plate fixed between the two fixed blocks. The fixed plate is L-shaped, and the polishing wheels are respectively rotatably disposed at the ends of the fixed plate.
[0014] Furthermore, an adjustment component is fixedly provided on one side of the fixed plate. The adjustment component includes a connecting shaft fixedly connected to the fixed plate. A connecting plate is rotatably provided at one end of the connecting shaft, and a limit block is hinged to the other end of the connecting plate.
[0015] Furthermore, the limiting block is U-shaped, and one edge of the sanding belt is inserted into the opening of the limiting block.
[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In this speaker shell polishing system, a CNC polishing module is set up, which can install different sanding belts according to needs to meet diverse polishing effects and improve system flexibility; moreover, the sanding belt has a large polishing area, low wear and tear, and low replacement frequency, which can save time and improve efficiency; it is also equipped with an adjustment component to precisely adjust the sanding belt tension, ensuring stable and consistent polishing effect, extending the sanding belt life and reducing costs.
[0017] 2. In this speaker shell grinding system, a tooling fixture is set up to stably and accurately clamp the speaker shell, providing reliable positioning for subsequent processes; and the secondary positioning bracket can solve the problem of primary clamping accuracy caused by workpiece size deviation, ensuring grinding quality, improving yield, and reducing costs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the speaker shell polishing system in a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of the loading and unloading rack in a preferred embodiment of the present invention; Figure 3 This is a schematic diagram of the overall structure of the speaker housing in a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of the six-joint industrial robot in a preferred embodiment of the present invention; Figure 5 This is a preferred embodiment of the present invention. Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the overall structure of the tooling fixture in a preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the overall structure of the secondary positioning bracket in a preferred embodiment of the present invention; Figure 8 This is a schematic diagram of the CNC grinding module installation structure in a preferred embodiment of the present invention; Figure 9 This is a preferred embodiment of the present invention. Figure 8 Enlarged schematic diagram of the structure at point B.
[0019] Figure label: 1. Installation platform; 11. Loading and unloading rack; 111. Guide rail; 112. Automatic door; 12. Support frame; 13. Pallet; 2. Speaker housing; 21. Partition plate; 22. Mounting slot; 3. Six-joint industrial robot; 4. Tooling and fixtures; 41. Mounting flange; 42. Cylinder; 43. Limit plate; 5. Secondary positioning bracket; 51. Fixed base; 52. Connecting rod; 53. Support frame; 6. CNC grinding module; 61. Fixing block; 62. Fixing plate; 63. Polishing wheel; 64. Sanding belt; 65. Adjusting component; 651. Connecting shaft; 652. Connecting plate; 653. Limiting block. Detailed Implementation
[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0021] This embodiment provides a speaker shell polishing system, including an installation platform 1 fixedly installed in a dustproof room. A loading and unloading rack 11 is fixedly installed on the installation platform 1. A tray 13 for placing and transporting speaker shell 2 is symmetrically slidably installed on the loading and unloading rack 11. A six-joint industrial robot 3 is fixedly installed on the installation platform 1. A tooling fixture 4 is fixedly installed at the end of the robotic arm of the six-joint industrial robot 3. The tooling fixture 4 is used to clamp the speaker shell 2. The installation platform 1 is also fixedly equipped with a secondary positioning bracket 5 and a support frame 12. Two CNC grinding modules 6 are symmetrically arranged on one side of the support frame 12. The CNC grinding module 6 includes at least a number of rotating polishing wheels 63. The outer wall of the polishing wheel 63 is provided with a sanding belt 64. The sanding belt 64 meshes with the polishing wheel 63 and is used to polish the speaker housing 2.
[0022] like Figure 1 and Figure 2 As shown, the main structural material of the loading and unloading rack 11 is steel. Two sets of guide rails 111 are symmetrically arranged on the loading and unloading rack 11. The guide rails 111 are linear guide rails 111. Both ends of the tray 13 are slidably mounted on the guide rails 111. The linear guide rails 111 have the characteristics of high precision, low friction and high rigidity, which can ensure the smoothness and accuracy of the tray 13 during the sliding process, effectively reduce production failures caused by poor sliding or position deviation, and greatly improve production efficiency and product quality. In addition, a positioning material is fixedly set on the top of the tray 13, and the speaker shell 2 is placed on the positioning material. The positioning material is made of a relatively soft material such as nylon to avoid scratching the speaker shell 2.
[0023] like Figure 1 and Figure 2As shown, processing different workpieces only requires changing the tray 13. The bottom of the tray 13 is movably equipped with a positioning pin. When the tray 13 is placed in the designated position of the loading and unloading rack 11, the positioning pin can be accurately inserted into the corresponding positioning hole on the loading and unloading rack 11 to achieve precise positioning of the tray 13 and ensure that the loading and unloading position is the same each time. The loading and unloading rack 11 is also fixedly equipped with an automatic door 112, and the loading and unloading rack 11 is located on one side of the automatic door 112 outside the dustproof room, where the worker is located for convenient operation. After the six-joint industrial robot 3 completes the removal of the speaker shell 2 from the tray 13, the tray 13 automatically exits outside the dustproof room to wait for the worker to change the material. At the same time, the robot then picks up the workpiece on another tray 13. The dual-station design effectively reduces the time wasted in the loading and unloading process.
[0024] like Figure 3 As shown, two partitions 21 are vertically fixed inside the speaker housing 2 in an alternating manner. The connection between the two partitions 21 is provided with a mounting groove 22. This structural layout not only enhances the structural strength of the speaker housing 2 itself, enabling it to better resist external forces during subsequent grinding, transportation and use, and reducing the risk of deformation and damage, but also provides a key structural foundation for the precise clamping of the tooling fixture 4.
[0025] like Figure 4 , Figure 5 and Figure 6 As shown, the tooling fixture 4 includes a mounting flange 41. One end of the mounting flange 41 is fixedly connected to the end of the robotic arm of the six-joint industrial robot 3, and the other end of the mounting flange 41 is fixedly connected to a cylinder 42. The output shafts at both ends of the cylinder 42 are fixedly connected to limit plates 43.
[0026] like Figure 4 and Figure 5 As shown, when the six-joint industrial robot 3 is driven to use the tooling fixture 4 to clamp the speaker housing 2, the cylinder 42 contacts the bottom of the mounting groove 22, and the two limiting plates 43 are located at the two opposite corners of the speaker housing 2. Then, the output shafts at both ends of the cylinder 42 are opened to drive the limiting plates 43 to move outward. The two sides of the limiting plates 43 gradually come into close contact with the two sides of the opposite corners of the speaker housing 2. Through the outward pushing force of the limiting plates 43, the speaker housing 2 is tightly clamped.
[0027] like Figure 7As shown, in actual production, due to various factors such as differences in raw materials, fluctuations in processing technology, and measurement errors, it is difficult to avoid certain deviations in workpiece dimensions. For products like speaker housing 2 that require high-precision processing and assembly, large dimensional deviations may lead to low precision during the first clamping. If subsequent grinding and other processes are carried out directly in the state after the first clamping, it may affect the processing quality of the product, resulting in defects such as out-of-tolerance dimensions and uneven surfaces, thereby reducing the product yield and increasing production costs. Therefore, setting up a secondary positioning bracket 5 has become a key measure to ensure production quality and efficiency.
[0028] like Figure 1 and Figure 7 As shown, the secondary positioning bracket 5 includes a fixed base 51 fixedly mounted on the mounting platform 1. Several connecting rods 52 are fixedly mounted on the fixed base 51, and a support frame 53 is fixedly mounted on the connecting rods 52. The support frame 53 is inclined and is composed of multiple mutually perpendicular rectangular plates. This unique structure provides multiple positioning surfaces for the speaker housing 2. The six-joint industrial robot 3 uses a tooling fixture 4 to pick up the speaker housing 2 from the tray 13, and then places the speaker housing 2 on the support frame 53. When the speaker housing 2 contacts the support frame 53, it will slide down along the inclined surface of the support frame 53 under its own weight and automatically fit the mutually perpendicular rectangular surfaces of the support frame 53. Then the robot operates the tooling fixture 4 again to pick up the speaker housing 2, which can ensure its accurate positioning.
[0029] like Figure 8 As shown, the CNC grinding module 6 also includes fixing blocks 61 symmetrically fixed on both sides of the support frame 12. A fixing plate 62 is fixedly disposed between the two fixing blocks 61. The fixing plate 62 is L-shaped. The polishing wheels 63 are respectively rotatably disposed at the ends of the fixing plate 62 in a triangular distribution, and each polishing wheel 63 has a different size. A motor is fixedly disposed on one side of the fixing plate 62. The output shaft of the motor is fixedly connected to the center of one of the polishing wheels 63. The motor drives the polishing wheel 63 to rotate, and the multiple polishing wheels 63 are synchronously rotated through the engagement of the sanding belt 64, thereby performing the grinding work.
[0030] like Figure 8 As shown, two sets of CNC grinding modules 6 are fixedly installed on one side of the support frame 12. The same or different sanding belts 64 can be installed on different modules according to the grinding needs to meet the requirements of different grinding effects. The four sides of the speaker shell 2, including the connecting arc surfaces between the four sides, need to be ground. The bottom plane and the upper arc surface of the speaker shell 2 do not need to be ground. The CNC grinding module 6 uses sanding belts 64 for grinding. The effective grinding area of the sanding belts 64 is larger than that of round sandpaper, with relatively less wear and tear. The sanding belts 64 need to be replaced less frequently, saving sandpaper replacement time and improving efficiency.
[0031] like Figure 8 and Figure 9 As shown, an adjustment component 65 is fixedly provided on one side of the fixed plate 62. The adjustment component 65 includes a connecting shaft 651 fixedly connected to the fixed plate 62. A connecting plate 652 is rotatably provided at one end of the connecting shaft 651, and a limit block 653 is hinged to the other end of the connecting plate 652.
[0032] like Figure 9 As shown, the limiting block 653 is U-shaped, and one edge of the sanding belt 64 is inserted into the opening of the limiting block 653. Therefore, by rotating the connecting plate 652, one end of it rotates around the connecting shaft 651. At the same time, the limiting block 653 on one side of the sanding belt 64 rotates around its hinge point with the connecting plate 652 and moves up or down, thereby adjusting the tension of the sanding belt 64. Precise tension adjustment of the sanding belt 64 can ensure the stability and consistency of the sanding effect. Appropriate tension can allow the sanding belt 64 to fully contact the surface of the speaker housing 2, remove material evenly, improve the smoothness and precision of the sanded surface, and avoid problems such as excessive wear of the sanding belt 64 and reduced sanding quality caused by improper tension. This extends the service life of the sanding belt 64 and reduces production costs.
[0033] like Figure 1 As shown, the dustproof room is equipped with a fixed entrance and exit door, which adopts an airtight sliding door to ensure the airtightness of the dustproof room. The design of the entrance and exit door fully considers the convenience of personnel and equipment to enter and exit, as well as the dustproof sealing. A main electrical cabinet is fixedly installed on the outside of the dustproof room, which not only facilitates the daily operation and maintenance of operators, but also avoids interference with the working space inside the dustproof room. A touch screen is fixedly installed on the main electrical cabinet as the core interface for human-machine interaction. By operating the touch screen outside the dustproof room, the six-joint industrial robot 3 is driven to perform the polishing work of the speaker shell 2.
[0034] In practical use, according to the specifications of the speaker housing 2 to be processed, a suitable tray 13 is selected, and both ends of the tray 13 are installed on the guide rails 111. The speaker housing 2 is then placed on the tray 13. The operator starts the system outside the dustproof room via the touch screen on the main electrical cabinet. The six-joint industrial robot 3, according to the preset program, controls the robotic arm to move above the tray 13, driving the tooling fixture 4 to approach the speaker housing 2. The cylinder 42 of the tooling fixture 4 contacts the bottom of the mounting groove 22 inside the speaker housing 2, and the two limiting plates 43 are located at two opposite corners of the speaker housing 2. Then, the output shaft of the cylinder 42 opens, driving the limiting plates 43 to move outward. The two sides of the limiting plates 43 make close contact with the two opposite sides of the speaker housing 2, tightly clamping the speaker housing 2. The six-joint industrial robot 3 places the clamped speaker housing 2 onto the support frame 53 of the secondary positioning bracket 5. Under its own gravity, the speaker housing 2 slides down the inclined surface and automatically fits into the three mutually perpendicular supports of the support frame 53. The robot operates the tooling fixture 4 again to grip the speaker housing 2 after secondary positioning, and moves the gripped speaker housing 2 to the CNC grinding module 6. The polishing wheel 63 is driven by the motor to rotate, and the position of the speaker housing 2 is adjusted so that its surface contacts the sanding belt 64. The four sides of the speaker housing 2 and the connecting arc surfaces between the four sides are polished. During the polishing process, if it is necessary to adjust the tension of the sanding belt 64, the connecting plate 652 can be rotated so that one end of it rotates around the connecting shaft 651. At the same time, the limiting block 653 on one side of the sanding belt 64 rotates around its hinge point with the connecting plate 652 and moves up or down to adjust the tension of the sanding belt 64. After the six-joint industrial robot 3 completes the picking up of the speaker housing 2 from each tray 13, the tray 13 is automatically removed from the dustproof room and waits for the worker to change the material. At the same time, the robot picks up the speaker housing 2 from another tray 13 and continues to perform secondary positioning and polishing operations according to the above process to realize dual-station alternating operation.
[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A sound box shell polishing system, comprising a mounting platform (1) fixedly arranged in a dustproof house, and an upper and lower feeding frame (11) fixedly arranged on the mounting platform (1), characterized in that, The loading and unloading rack (11) is symmetrically slidably provided with a tray (13) for placing and transporting the speaker housing (2). A six-joint industrial robot (3) is fixedly provided on the mounting platform (1). A tooling fixture (4) is fixedly installed at the end of the robotic arm of the six-joint industrial robot (3). The tooling fixture (4) is used to clamp the speaker housing (2). The installation platform (1) is also fixedly provided with a secondary positioning bracket (5) and a support frame (12). Two CNC grinding modules (6) are symmetrically arranged on one side of the support frame (12). The CNC grinding module (6) includes at least a number of rotating polishing wheels (63). The outer wall of the polishing wheel (63) is provided with a sanding belt (64). The sanding belt (64) meshes with the polishing wheel (63). The sanding belt (64) is used to polish the speaker shell (2).
2. The speaker enclosure sanding system of claim 1, wherein, Two sets of guide rails (111) are symmetrically provided on the loading and unloading rack (11). Both ends of the tray (13) are slidably installed on the guide rails (111), and a positioning material is fixedly provided on the top of the tray (13). The speaker shell (2) is placed on the positioning material.
3. The speaker enclosure sanding system of claim 1, wherein, The bottom of the tray (13) is movably provided with a positioning pin, and the loading and unloading rack (11) is also fixedly provided with an automatic door (112).
4. The speaker enclosure sanding system of claim 1, wherein, Two partitions (21) are vertically fixed inside the speaker housing (2), and an installation groove (22) is provided at the connection of the two partitions (21).
5. The speaker enclosure sanding system of claim 4, wherein, The tooling fixture (4) includes a mounting flange (41), one end of which is fixedly connected to the end of the robotic arm of the six-joint industrial robot (3), and the other end of which is fixedly connected to a cylinder (42), and the output shafts at both ends of the cylinder (42) are fixedly connected to limit plates (43).
6. The speaker enclosure sanding system of claim 5, wherein, When the six-joint industrial robot (3) drives the tooling fixture (4) to clamp the speaker housing (2), the cylinder (42) contacts the bottom of the mounting groove (22), and the two limiting plates (43) are located at two opposite corners of the speaker housing (2).
7. The speaker enclosure sanding system of claim 1, wherein, The secondary positioning bracket (5) includes a fixed seat (51) fixedly installed on the installation platform (1), a number of connecting rods (52) are fixedly installed on the fixed seat (51), and a support frame (53) is fixedly installed on the connecting rods (52). The support frame (53) is inclined and is composed of multiple rectangular plates that are perpendicular to each other.
8. The speaker enclosure sanding system of claim 1, wherein, The CNC grinding module (6) also includes fixed blocks (61) symmetrically fixed on both sides of the support frame (12), and a fixed plate (62) is fixedly disposed between the two fixed blocks (61). The fixed plate (62) is L-shaped, and the polishing wheels (63) are respectively rotatably disposed at the ends of the fixed plate (62).
9. The speaker enclosure sanding system of claim 8, wherein, An adjusting component (65) is fixedly provided on one side of the fixed plate (62). The adjusting component (65) includes a connecting shaft (651) fixedly connected to the fixed plate (62). A connecting plate (652) is rotatably provided at one end of the connecting shaft (651), and a limit block (653) is hinged to the other end of the connecting plate (652).
10. The speaker enclosure sanding system of claim 9, wherein, The limiting block (653) is in U shape, and one side edge of the abrasive belt (64) is inserted at the opening of the limiting block (653).