Special electrifying main shaft for low-voltage micro-arc machining robot

Abstract

The utility model discloses a special power-on main shaft for a low-voltage micro-arc machining robot, and relates to the technical field of industrial equipment. The device comprises a stepped shaft (16), wherein a medium channel is formed in the stepped shaft (16); the rotary joint (5) is fixed at the top of the stepped shaft (16); the synchronous pulley (2) is sleeved on the stepped shaft (16); the carbon brush assembly is fixed through a carbon brush seat (14) and comprises a carbon brush holder (13) and a carbon brush (12) which is tightly jacked by a clamp spring (10); the first bearing body (11), the second bearing body (15) and the third bearing body (17) are arranged on the outer side of the stepped shaft (16) in a sleeving mode, and the shell (8) and the sleeve shell (6) are matched with the first bearing body (11), the second bearing body (15) and the third bearing body (17). The insulating plate (4) and the connecting support (3) are used for connection. By means of the compact structural design, the six-axis mechanical arm can be matched with the tail end of the six-axis mechanical arm, the machining freedom degree is improved, the medium channel can spray machining media to remove chippings and cool workpieces, and precise machining can be achieved easily.

Description

Technical Field

[0001] This utility model belongs to the field of industrial equipment technology, and in particular relates to a special power-on spindle for low-pressure micro-arc processing robots. Background Technology

[0002] Manufacturing plays a crucial role in the global industrialization process. Aerospace, automotive, and electronics are vital components of manufacturing, and their technological level and production capacity are comprehensive reflections of a nation's manufacturing strength and the modernization level of its defense science and technology industry. They play a pivotal role in the modernization of the national economy and national defense. Within the aerospace, automotive, and electronics industries, core components, due to their diverse types, structures, and performance characteristics, are characterized by high requirements for shape coordination, light weight, complex and precise structures, and high hardness, making their processing methods of great interest.

[0003] For core components with these characteristics, five-axis high-speed mechanical milling is commonly used. However, due to the complex and precise structure, high hardness, and stringent shape requirements of the parts, machining often results in low cutting efficiency, high tool wear, insufficient flexibility, and problems such as cutting deformation and chatter, leading to unsatisfactory machining results. Low-pressure micro-arc machining, a non-contact special machining method, essentially eliminates cutting stress, effectively solving the problems of deformation and chatter during machining. It is particularly suitable for machining complex curved cavity parts with high strength and toughness, complex shapes, and poor tool accessibility. Six-axis robots, due to their small size and high degrees of freedom, can also effectively solve the problem of insufficient flexibility during machining. Therefore, how to combine low-pressure micro-arc machining with six-axis robots is a new research problem in the field of special machining.

[0004] The combination of low-pressure micro-arc machining and a six-axis robot not only inherits the advantage of low-pressure micro-arc machining being unrestricted by the mechanical properties of metal materials such as strength, hardness, and toughness, but also offers significant advantages in in-situ machining. Low-pressure micro-arc machining robots can perform machining in the workpiece's original position without moving or repositioning it. This is particularly important for large, complex, or difficult-to-move workpieces. Low-pressure micro-arc machining robots can be equipped with portable devices to perform machining directly on the workpiece, eliminating the need for cumbersome workpiece handling and positioning operations. This not only saves time and labor costs but also reduces the risk of errors caused by workpiece movement.

[0005] Finally, high-efficiency and high-quality machining is another important advantage of low-pressure micro-arc robotic machining. Due to its high material removal rate and low cutting stress, low-pressure micro-arc machining robots can complete machining tasks in a shorter time. Simultaneously, the reduced cutting stress results in less heat generation and deformation during machining, thus ensuring machining quality. Furthermore, the introduction of robotics technology increases the degree of automation in machining, reduces human intervention and errors, and further improves machining efficiency and quality. Summary of the Invention

[0006] The purpose of this utility model is to provide a dedicated power-on spindle device for low-pressure micro-arc machining robots, based on the above discussion. This addresses the problem that existing low-pressure micro-arc machining equipment has a complex electric spindle structure, often unsuitable for use with high-degree-of-freedom machining equipment such as six-axis robotic arms. Furthermore, current power-on spindles are relatively large and heavy, making them unsuitable for six-axis robotic arms. Currently available low-pressure micro-arc machining equipment power-on spindles are incompatible with six-axis robotic arms. Among the various technical solutions provided by this utility model, the preferred solution is a spindle designed to adapt to six-axis low-pressure micro-arc machining robots. Through structural design, it reduces assembly difficulty while meeting the relevant process requirements of six-axis low-pressure micro-arc machining. Simultaneously, its reasonable size design meets the machining needs of six-axis robotic arms and allows for good matching, as detailed below:

[0007] To achieve the above objectives, the invention adopts the following technical solution.

[0008] The portable low-voltage micro-arc electric spindle device provided by this utility model includes:

[0009] A stepped shaft, wherein an internal channel is opened through which the processing medium can pass;

[0010] A rotary joint is fixedly installed on the top of the stepped shaft, and an interface is mounted on it;

[0011] An insulating plate is fixed between the connecting bracket and the carbon brush assembly cover;

[0012] Synchronous pulley, mounted on the upper part of the stepped shaft, below the rotary joint;

[0013] The carbon brush holder is installed on the upper part of the stepped shaft and is connected to the carbon brush assembly cover by studs;

[0014] The brush holder is located above the brush holder, outside the stepped shaft, and the brushes are placed inside the brush holder. It also has internal slots for holding retaining springs.

[0015] The carbon brush assembly cover is fitted onto the outside of the stepped shaft, corresponding to the outside of the carbon brush;

[0016] Bearing body one, bearing body two, and bearing body three are fitted onto the outside of the stepped shaft and positioned below the synchronous belt pulley;

[0017] The housing is fitted onto the outside of the bearing body.

[0018] The retaining ring is installed in the carbon brush holder slot to hold the carbon brush tightly against the discharge spindle.

[0019] Preferably, the outer wall of the stepped shaft is provided with a positioning step for separating the bearing body one, bearing body two, and bearing body three. There is one bearing body one, located above the positioning step and close to the synchronous pulley. There is one bearing body two, located in the middle of the positioning step and away from the synchronous pulley. There is one bearing body three, located below the positioning step and close to the lower side of the housing.

[0020] Preferably, an insulating plate is provided between the dedicated power-on spindle and the connecting bracket.

[0021] As a preferred option, the housing, carbon brush assembly cover, and casing are all connected by bolts for sealing, which serves to prevent dust.

[0022] Preferably, the carbon brush assembly cover and the outer surface of the housing are coated with an insulating coating.

[0023] The low-pressure micro-arc machining robot-specific electric spindle of this utility model has the following advantages:

[0024] A low-pressure micro-arc machining power-on spindle was designed to work with a six-axis low-pressure micro-arc machining robot, greatly improving the operational accuracy and flexibility of low-pressure micro-arc machining while reducing labor intensity. It also has wider applicability to different machining processes and can achieve accurate positioning, making it more practical in the field of precision machining. Furthermore, the designed clamping device facilitates electrode replacement and supports multiple electrode types, increasing the versatility of machining processes.

[0025] The upper rotary joint has a threaded hole, allowing the introduction of machining media to promptly clean up machining debris, thus improving machining accuracy. Furthermore, it can effectively and promptly cool the surface of the workpiece during machining, enhancing the quality of the process. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the internal structure after shelling;

[0029] Figure 3 This is a schematic diagram of the assembly of the powered spindle and the six-axis low-pressure micro-arc machining robot;

[0030] Figure 4 This is a schematic diagram of the connection structure between the powered spindle and the six-axis low-pressure micro-arc machining robot.

[0031] Figure 5 This is a schematic diagram of the rotary joint structure of component 5 in the powered spindle;

[0032] Explanation of markings in the diagram: 1—Motor, 2—Motor synchronous pulley, 3—Connecting bracket, 4—Insulating plate, 5—Rotary joint, 6—Casing, 7—Carbon brush assembly cover, 8—Housing, 9—Electrode clamping mechanism, 10—Snap ring, 11—Bearing body one, 12—Carbon brush, 13—Carbon brush holder, 14—Carbon brush seat, 15—Bearing two, 16—Stepped shaft, 17—Bearing body three, 18—Six-axis low-pressure micro-arc machining robot end effector, 19—Flange, 20—Bolt. Detailed Implementation

[0033] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "outer", "inner", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0035] Furthermore, the terms "firstly" and "secondly" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "firstly" or "secondly" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0038] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a low-pressure micro-arc machining robot-specific power-on spindle.

[0039] In the figure, the mechanism consists of motor 1, motor synchronous pulley 2, connecting bracket 3, insulating plate 4, rotary joint 5, housing 6, carbon brush assembly cover 7, housing 8, electrode clamping mechanism 9, snap ring 10, bearing body one 11, carbon brush 12, carbon brush holder 13, carbon brush seat 14, bearing body two 15, stepped shaft 16, and bearing body three 17.

[0040] The connecting bracket 3 shown in the figure has multiple bolt holes, and the motor 1 is fixedly mounted on the connecting bracket 3 by bolts. When the motor 1 is working, the main shaft rotates, which drives the motor synchronous pulley 2 to drive the stepped shaft 16 to rotate, thereby adjusting the speed.

[0041] The stepped shaft 16 has an internal channel designed for the flow of processing media. This vertically arranged stepped shaft 16 has multiple positioning steps machined on its outer wall. These steps are specifically designed for the installation of other components such as the carbon brush assembly cover 7, the motor synchronous pulley 2, bearing housings 1, 15, and 17, and the housing 8. This design not only facilitates the precise positioning and installation of these components but also greatly simplifies the assembly process and improves disassembly and assembly efficiency.

[0042] The rotary joint 5 is provided with a threaded hole to connect to a pipeline for conveying the medium. Below it is a channel hole aligned with the stepped shaft 16, allowing the processing medium to smoothly enter the stepped shaft 16 through the rotary joint. The rotary joint is divided into a stator section and a rotor section. The stator section connects to the pipeline and does not rotate. The stator section and rotor section are connected in the middle, and the rotor section rotates with the stepped shaft.

[0043] The synchronous pulley 2 of the motor has a keyway at the connection point with the stepped shaft 16 for easy keying. During operation, the rotation of the motor 1 drives the stepped shaft 16 to rotate via the synchronous pulley 2.

[0044] The housing 6 is fixed to the carbon brush assembly cover 7 by bolts, covering the connection between the motor synchronous pulley 2 and the stepped shaft 16, to prevent dust and impurities in the processing environment from entering the interior of the mechanism.

[0045] The carbon brush 12 is fixed on the carbon brush holder 13, which is mounted on the carbon brush holder 14. The carbon brush holder 14 is fixed to the connecting bracket 3 via the carbon brush assembly cover 7. The spindle is connected to the carbon brush assembly cover 7 and the housing 8 via bearing body 11, bearing body 2 15, and bearing body 3 17.

[0046] The carbon brush assembly cover 7 is fixed on the connecting bracket 3, and an insulating plate 4 is placed at the connection point with the connecting bracket 3 to prevent current from flowing out.

[0047] The housing 8 is connected to bearing body 2 15 and bearing body 3 17, and is connected to the carbon brush assembly cover 7 and the stepped shaft 16 through these two bearing bodies.

[0048] The workpiece is processed by connecting the processing electrode through the clamping mechanism 9.

[0049] First, we use the positioning steps of the stepped shaft 16 to determine the initial assembly position of the rotating assembly. Then, from the top and bottom of the stepped shaft 12, we fit the bearing body 1, the sleeve 6, and the carbon brush assembly cover 7 together, ensuring that they interlock and are securely fixed.

[0050] After these components are secured, the timing pulley 2 is placed above the carbon brush assembly cover 7 to ensure accurate assembly. Next, the carbon brush holder 14 is fixed to the outside of the stepped shaft 16 and its position is adjusted to fit snugly against the end cover of the bearing housing 15. Using studs, the carbon brush holder 14 is securely connected to the end cover of the bearing housing 15 to ensure the stability of the overall structure.

[0051] Next, adjust the position of the carbon brush 12 inside the carbon brush holder 13, using the retaining spring 10 to ensure a tight fit against the stepped shaft 16 and good contact. Finally, install the rotary joint 5 on the top of the stepped shaft 16 and connect the corresponding media delivery pipe to the rotary joint 5 to form a complete flow path.

[0052] The carbon brush holder 14 has pre-drilled mounting holes, through which the device is fixed to ensure its stability during operation.

[0053] Finally, the installed power-on spindle is connected to the end part 18 of the six-axis low-pressure micro-arc machining robot via the connecting bracket 3 and flange 19 using bolts 20. At this point, the entire installation process is complete, the equipment is ready, and it can begin normal operation.

[0054] When using this device, motor 1 drives synchronous pulley 2, which in turn rotates the synchronous pulley 2. This action allows the stepped shaft 16 to rotate smoothly inside the housing 8. At the same time, the close fit between carbon brush 12 and stepped shaft 16 ensures a continuous power supply, effectively guiding single-stage current into the stepped shaft 16. On the other hand, the workpiece fixed on the processing table is connected to another stage of current, forming a complete circuit.

[0055] At this time, the low-pressure micro-arc working medium is introduced into the rotary joint 5 through the pipeline, then flows along the channel inside the stepped shaft 16, and is finally uniformly discharged from the outlet at the bottom of the stepped shaft 16. During this process, the motor 1 continues to drive the synchronous pulley 2 and the stepped shaft 16 to rotate, ensuring that the working medium can flow out uniformly, effectively flushing away impurities generated by the workpiece and reducing the temperature of the workpiece surface.

[0056] Finally, the workpiece is melted using the generated high-temperature electric arc, thus completing the entire process of the device. This continuous operation ensures the efficient operation of the device and the high-quality processing of the workpiece.

[0057] In another embodiment, an insulating plate 4 is provided between the dedicated power-on spindle and the connecting bracket 3. This prevents current leakage to the end portion 18 of the six-axis robotic arm, thereby protecting the six-axis robotic arm and the operator.

[0058] In another embodiment, the dedicated power-on spindle is connected to the end portion 18 of the six-axis robotic arm via a flange 19 and bolts 20, which is simple and robust in structure and easy to disassemble and replace.

[0059] In another embodiment, the outer walls of the sleeve 6, the carbon brush assembly cover 7, and the housing 8 are all coated with an insulating coating. The assembly cover and housing are installed on the outside of the spindle, which not only securely mount the components on the stepped shaft, but also isolate the spindle from the outside environment, providing insulation. These components ensure that during operation, the sleeve 6, carbon brush assembly cover 7, housing 8, and external base remain insulated from the stepped shaft 16, effectively preventing current leakage and thus avoiding impact on other workpieces. Current can only be transmitted along the stepped shaft 16, meeting the needs of workpiece production while also ensuring the safety of the machining process.

[0060] In another embodiment, the housing 6, the carbon brush assembly cover 7, and the housing 8 are all connected by bolts for sealing, which serves as a dustproof function and can effectively prevent dust and impurities in the processing environment from entering the mechanism.

[0061] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A low-voltage micro-arc machining robot dedicated live spindle, characterized in that: include: A stepped shaft (16) with a channel for the processing medium to pass through inside; a rotary joint (5) fixedly installed on the top of the stepped shaft (16); an insulating plate (4) fixed between the connecting bracket (3) and the carbon brush assembly cover (7); a motor synchronous pulley (2) fitted on the top of the stepped shaft (16); a carbon brush holder (14) fitted on top of the stepped shaft (16) and fixed to the carbon brush assembly cover (7) by studs; and a carbon brush holder (13) positioned above the carbon brush holder (14) and outside the stepped shaft (16). On the side, the carbon brush (12) is placed inside the carbon brush holder (13); the carbon brush holder (13) has a groove, and the retaining ring (10) is installed in the groove, with the other end pressing against the carbon brush (12); the carbon brush assembly cover (7) is fitted on the outside of the stepped shaft, corresponding to the outside of the carbon brush; bearing body one (11), bearing body two (15), and bearing body three (17) are fitted on the outside of the stepped shaft (16) and set below the synchronous pulley (2); housing (8) is fitted on the outside of bearing body two (15) and bearing body three (17); sleeve (6) is fitted on the outside of bearing body one (11).

2. The low-voltage micro-arc machining robot special super major shaft according to claim 1, characterized in that: The outer wall of the stepped shaft is provided with a positioning step for separating the bearing body one, bearing body two, and bearing body three. There is one bearing body one, located above the positioning step and close to the synchronous pulley. There is one bearing body two, located in the middle of the positioning step and away from the synchronous pulley. There is one bearing body three, located below the positioning step and close to the lower side of the housing.

3. The low-voltage micro-arc machining robot special super major shaft according to claim 1, characterized in that: The insulating plate (4) is used to isolate the connecting bracket (3) from the carbon brush assembly cover (7).

4. The low-voltage micro-arc machining robot special super major shaft according to claim 1, characterized in that: The carbon brush assembly cover and the exterior of the housing are coated with an insulating coating.

5. The low-voltage micro-arc machining robot special super major shaft according to claim 1, characterized in that: The casing, carbon brush assembly cover, and housing are all connected by bolts for sealing, which serves to prevent dust.

6. The low-voltage micro-arc machining robot special super major shaft according to claim 1, characterized in that: The connecting bracket (3) is connected to the end part (18) of the six-axis robotic arm via a flange (19) and bolts (20). The structure is simple and robust, and easy to disassemble and replace.

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