Infinite rotating unit for mechanical arm 2-axis NC

Abstract

The invention discloses an infinite rotating unit for mechanical arm 2-axis NC. The infinite rotating unit comprises a stator, a rotor assembly, a carbon brush assembly and a driving assembly. The rotor assembly comprises a first rotor and a second rotor, the driving assembly comprises a driving source, a transmission speed reduction part, a first connecting plate and a second connecting plate, the carbon brush assembly comprises a carbon brush plate and a carbon brush, the carbon brush plate is arranged on the outer ring of a supporting shaft on the stator, and the carbon brush is fixedly installed on the shell. The first rotor is rotationally connected with the stator through a first rotary supporting part, the lower end face of the first rotor is fixedly connected with the end cover, the second rotor is provided with a mounting hole in the axial direction, the second rotor sleeves the first rotor, and the lower end face of the second rotor is fixedly connected with the end cover through a bolt; the second rotor is rotationally connected with the supporting shaft through a second rotating supporting part. The technical problem that in the technical field of mold plastic product automation, a traditional mechanical arm 2-shaft NC cannot achieve 360-degree infinite rotation due to winding of an air pipe and a signal line is solved.

Description

Technical Field

[0001] This invention relates to the field of automation technology for molded plastic products, specifically to an infinite rotation unit for a 2-axis NC robotic arm. Background Technology

[0002] In the automated production process of injection-molded products, the take-out machine needs to clamp the molded products from the mold and transfer them to a designated workstation. During this process, a tooling pallet is required to change the product's placement orientation to facilitate subsequent process flow. This places high demands on the rotation function of the 2-axis NC robotic arm. To improve production efficiency, reduce automation transformation costs, and achieve free setting of product placement orientation, the 2-axis NC robotic arm needs to have 360° infinite rotation capability. Therefore, there is an urgent and widespread application demand for related infinite rotation units.

[0003] Existing 2-axis NC robotic arms, after having a gripper plate installed at the end, require connecting air pipes and signal lines for gripping components. These exposed pipes become entangled and pulled as the 2-axis NC rotates, severely limiting its rotation angle. When rotating to a certain angle, the pipe entanglement forces the equipment to return to its initial position, preventing continuous large-angle rotation. This not only affects production cycle time but also increases the probability of pipe wear and downtime, making it difficult to meet the high-efficiency operation requirements of automated production lines. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an infinite rotation unit for a 2-axis NC robotic arm, which solves the technical problem in the field of automation technology for mold and plastic products where traditional 2-axis NC robotic arms cannot achieve 360° infinite rotation due to the entanglement of air pipes and signal lines.

[0005] To achieve the above-mentioned technical objectives, the present invention provides an infinite rotation unit for a 2-axis NC robotic arm, comprising: The system comprises a stator, a rotor assembly, a carbon brush assembly, and a drive assembly; the rotor assembly includes a first rotor and a second rotor; the drive assembly includes a drive source, a transmission reduction component, a first connecting plate, and a second connecting plate; the carbon brush assembly includes a carbon brush plate and carbon brushes; the carbon brush plate is disposed on the outer ring of a support shaft on the stator, and the carbon brushes are fixedly mounted on a housing; the first rotor is rotatably connected to the stator via a first rotating support component, and the lower end face of the first rotor is fixedly connected to an end cover; wherein the second rotor has an axially formed mounting hole, the second rotor is sleeved on the first rotor, and the lower end face of the second rotor is fixedly connected to the end cover by bolts; the second rotor is rotatably connected to the support shaft via a second rotating support component.

[0006] Compared with the prior art, the beneficial effects of the present invention include: 1. Achieving 360° Infinite Rotation, Completely Solving the Problem of Pipeline Entanglement: This invention utilizes a sealed air passage structure between the stator, the first rotor, and the second rotor, combined with a carbon brush-carbon brush plate signal sliding connection structure. This keeps the air passage and signal input port at the stator end fixed, while the first and second rotor ends rotate synchronously with the 2-axis NC. This design completely avoids the entanglement problem caused by exposed air pipes and signal lines in traditional 2-axis NC systems. It achieves continuous 360° rotation without the need for mid-process repositioning, meeting the requirement for free directional setting during injection molding process flow.

[0007] 2. Stable and reliable air and signal transmission ensure continuous equipment operation: During air transmission, the sealing rings on the mating surfaces of the stator and the first and second rotors effectively prevent gas leakage, ensuring a stable air supply to the pneumatic components of the end clamp plate. During signal transmission, the special material carbon brushes and the carbon brush plate slip rings are always in close contact, enabling continuous signal conduction at any rotation angle without interruption or delay, avoiding clamp malfunction or production stoppage due to signal loss.

[0008] 3. Adaptable to various production scenarios and improved efficiency of automated production lines: This invention allows for adjustment of component parameters according to different load and precision requirements. It is suitable for the transfer of conventional injection molded parts, as well as for special scenarios such as high-precision positioning of micro-precision parts and heavy-duty transfer of large mold components. The equipment exhibits strong stability during continuous operation, matching the high-speed cycle of automated production lines, reducing downtime due to malfunctions, and significantly improving overall production efficiency. Attached Figure Description

[0009] Figure 1 This is a three-dimensional exploded view of the infinite rotation unit for 2-axis NC robotic arm provided by the present invention; Figure 2 This is a front view schematic diagram of the infinite rotation unit for 2-axis NC robotic arm provided by the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the AA cross-sectional structure provided by the present invention; Figure 4 This is a front view schematic diagram of the infinite rotation unit for 2-axis NC robotic arm provided by the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the gas flow direction in the infinite rotation unit for 2-axis NC robotic arm provided by the present invention. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0011] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0012] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0013] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 This embodiment provides an infinite rotation unit for a 2-axis NC robotic arm, including a stator 1, a rotor assembly 2, a carbon brush assembly 3, a drive assembly 4, and an air passage sealing assembly 5.

[0014] Furthermore, the rotor assembly 2 includes a first rotor 21 and a second rotor 22. The drive assembly 4 includes a drive source 41, a transmission reduction component 42, a first connecting plate 43, and a second connecting plate 44.

[0015] Furthermore, the drive source 41 is a servo motor. In this embodiment, the servo motor has the ability to precisely control the rotation angle and speed, which is suitable for the high precision and high stability operation requirements of automated production lines.

[0016] Furthermore, the carbon brush assembly 3 includes a carbon brush plate 31 and a carbon brush 32; the carbon brush plate 31 is disposed on the outer ring of the support shaft 6 on the stator 1, and the carbon brush 31 is fixedly installed on the housing 7.

[0017] Furthermore, the carbon brush plate 31 is connected to an input signal line 31-1, and the carbon brush 32 is connected to an output signal line 32-1. The signal from the input signal line 31-1 is transmitted to the output signal line 32-1 via the slip ring of the carbon brush plate 31 and the brush head of the carbon brush 32.

[0018] Furthermore, the carbon brush 32 is made of a special material that is wear-resistant and has good electrical conductivity.

[0019] Furthermore, in this embodiment, the brush head of the carbon brush 32 is in close contact with the slip ring on the carbon brush plate 31. As the carbon brush 32 rotates, it maintains an electrical connection with the carbon brush plate 31 to ensure uninterrupted signal transmission. Specifically, the carbon brush 32 is fixedly connected to the housing 7, enabling 360° rotation. Simultaneously, it maintains close contact with the slip ring on the carbon brush plate 31 through its own elasticity or pressure, thus achieving signal transmission. The slip ring on the carbon brush plate 31 provides a stable contact carrier for the carbon brush 32, ensuring continuous unobstructed signal transmission during rotation. By utilizing the sliding contact structure between the carbon brush 32 and the carbon brush plate 31, the input signal line at the stator 1 end and the output signal lines of the first rotor 21 and the second rotor 22 can achieve continuous conduction during rotation without physical winding.

[0020] Furthermore, the first rotor 21 is rotatably connected to the stator 1 via the first rotating support component 23, and the lower end face of the first rotor 21 is fixedly connected to the end cover 8. The second rotor 22 is provided with an axial mounting hole and is sleeved on the first rotor 21. The lower end face of the second rotor 22 is fixedly connected to the end cover 8 by bolts. The first rotor 21 is rotatably connected to the support shaft 6 via the second rotating support component 24.

[0021] Furthermore, the first rotor 21 has a T-shaped cross-section, the outer wall of the upper end of the first rotor 21 is in contact with the outer wall of the first rotating support component 23, and the outer wall of the first rotating support component 23 is in contact with the inner wall of the stator 1. The first rotating support component 23 plays the role of supporting rotation.

[0022] Preferably, both the first rotating support component 23 and the second rotating support component 24 are made of bearings.

[0023] Specifically, when the first rotor 21 rotates, since the end of the first rotor 21 is fixedly connected to the end cover 8, the end cover 8 is driven to rotate synchronously with the first rotor 21. Secondly, since the second rotor 21 is fixedly connected to the end cover 8, the second rotor 22 is also driven to rotate synchronously with the end cover 8. The first rotor 21, the second rotor 22, and the end cover 8 rotate synchronously, and their rotational angular velocities are the same.

[0024] Furthermore, the support shaft 6 is sleeved on the lower end of the stator 1 and the first rotor 21 and the second rotor 22. The inner wall of the second rotating support component 24 is in contact with the outer wall of the second rotor 22. The second rotating support component 24 is limited by the second rotor 22 and the end cover 8, thereby realizing that the support shaft 6 is stationary relative to the stator 1 and rotates relative to the end cover 8 and the second rotor 22.

[0025] Furthermore, the stator 1 has a T-shaped cross-section, and the upper end of the stator 1 has multiple input air holes 1-1 radially opened. The multiple input air holes 1-1 are connected to the surface air holes of the first rotor 21 and the second rotor 11 respectively through the internal air passage of the stator 1. At the same time, the surface air passages of the first rotor 21 and the second rotor 22 are connected to the internal air passage of the end cover 8.

[0026] Furthermore, the surface of the first rotor 21 is provided with a circumferential air passage, that is, the air passage connecting to the internal air passage output end of the stator 1 is annular. When the first rotor 21 rotates relative to the stator 1, since the air passage connecting to the stator 1 is annular, the air passage on the surface of the first rotor 21 can always connect with the internal air passage of the stator 1. The air passage on the surface of the second rotor 22 is set in the same way as the air passage on the surface of the first rotor 21. Since the end cover 8 is relatively fixed to the first rotor 21 and the second rotor 22, the air passage connecting the first rotor 21 and the second rotor 22 to the internal air passage of the end cover 8 can be annular or not, as long as the air passage can allow gas to flow.

[0027] Furthermore, the air passage sealing assembly 5 includes a first sealing unit 51 and a second sealing unit 52, which are respectively disposed between the mating surfaces of the stator 1 and the first rotor 21 and the second rotor 22.

[0028] Furthermore, the end cap 8 has an output air hole 8-1 in the radial direction, and the gas is output through the output air hole 8-1 and the internal air passage of the end cap 8.

[0029] Specifically, external air enters the device through the input air hole 1-1 on the circumferential surface of the stator 1, flows through the internal air passage of the stator 1 to the outer surface air holes of the first rotor 21 and the second rotor 22, and after passing through the surface flow channels of the first rotor 21 and the second rotor 22, the gas is collected in the internal flow channel of the end cover 8, and finally discharged from the output air hole 8-1 on the circumferential surface of the end cover 8 to supply the pneumatic components of the end clamp plate. During this process, the first sealing unit 51 and the second sealing unit 52 always maintain the sealing state of the mating surfaces of the stator 1 with the first rotor 21 and the second rotor 22 to ensure no gas leakage. Through the above structure, gas transmission and control in the rotating state are realized, gas leakage is avoided, and the air passage rotates with the first rotor and the second rotor without entanglement.

[0030] Preferably, the first sealing unit 51 and the second sealing unit 52 are O-rings.

[0031] Furthermore, the output end of the drive source 41 is driven to be connected to the input end of the transmission reduction component 42 to increase the output torque of the drive source 41. The output end of the transmission reduction component 42 is bolted to the upper end of the first rotor 21 through the first connecting plate 43, and the lower end of the end cover 8 is bolted to the 2-axis NC through the second connecting plate 44.

[0032] Specifically, when the drive source 41 is working, it drives the transmission reduction component 42, which in turn drives the first rotor 21 to rotate. The first rotor 21 then drives the end cover 8 to rotate, thereby driving the two-axis NC9 to rotate. In this embodiment, the transmission reduction component 42 is a speed reducer, whose core function is to reduce speed and increase torque, match power parameters, and ensure the stability and reliability of the infinite rotation of the two-axis NC.

[0033] Working Principle: The two-axis NC infinite rotation unit for robotic arms provided by this invention includes a stator 1, a rotor assembly 2, a carbon brush assembly 3, and a drive assembly 4. The rotor assembly 2 includes a first rotor 21 and a second rotor 22. The drive assembly 4 includes a drive source 41, a transmission reduction component 42, a first connecting plate 43, and a second connecting plate 44. The carbon brush assembly 3 includes a carbon brush plate 31 and carbon brushes 32. The carbon brush plate 31 is disposed on the outer ring of the support shaft 6 on the stator 1, and the carbon brushes 32 are fixedly installed on the housing 7. The first rotor 21 is rotatably connected to the stator 1 through a first rotating support component 23, and the lower end face of the first rotor 21 is fixedly connected to an end cover 8. The second rotor 22 has an axially oriented mounting hole and is sleeved on the first rotor 21. The lower end face of the second rotor 22 is fixedly connected to the end cover 8 by bolts. The second rotor 22 is rotatably connected to the support shaft 6 through a second rotating support component 24.

[0034] Specifically, the gas path section adopts the structure of input from the stator 1 and output from the first rotor 21 and the second rotor 22. The gas path is sealed in the rotating state through the first sealing unit 51 and the second sealing unit 52, preventing gas leakage. At the same time, the gas path channel rotates with the rotor and will not be entangled.

[0035] Signal section: By utilizing the sliding contact structure between the carbon brush 32 and the carbon brush plate 31, the input signal line at the stator 1 end and the output signal line at the first rotor 21 end can achieve continuous conduction in the rotating state without physical winding.

[0036] This invention integrates the air passage structure, signal transmission structure, drive source 41, and transmission reduction component 42 into the same unit, which can be directly added to a traditional 2-axis NC without changing the core structure of the original equipment, thus reducing the cost of modifying the automation device.

[0037] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An infinite rotation unit for a 2-axis NC robotic arm, characterized in that, The system includes a stator, a rotor assembly, a carbon brush assembly, and a drive assembly. The rotor assembly includes a first rotor and a second rotor. The drive assembly includes a drive source, a transmission reduction component, a first connecting plate, and a second connecting plate. The carbon brush assembly includes a carbon brush plate and carbon brushes. The carbon brush plate is disposed on the outer ring of a support shaft on the stator, and the carbon brushes are fixedly mounted on a housing. The first rotor is rotatably connected to the stator via a first rotating support component, and the lower end face of the first rotor is fixedly connected to an end cover. The second rotor has an axially extending mounting hole, is sleeved on the first rotor, and the lower end face of the second rotor is fixedly connected to the end cover by bolts. The second rotor is rotatably connected to the support shaft via a second rotating support component.

2. The infinite rotation unit for a 2-axis NC robotic arm according to claim 1, characterized in that, The stator has a T-shaped cross-section, and multiple input air holes are radially opened at the upper end of the stator. The multiple input air holes are connected to the surface air holes of the first rotor and the second rotor respectively through the internal air passage of the stator. At the same time, the surface air passages of the first rotor and the second rotor are connected to the internal air passage of the end cover. The end cover has an output air hole radially opened, and the gas is output through the output air hole and the internal air passage of the end cover.

3. The infinite rotation unit for a 2-axis NC robotic arm according to claim 2, characterized in that, The carbon brush plate is connected to an input signal line, and the carbon brush is connected to an output signal line. The signal from the input signal line is transmitted to the output signal line through the slip ring of the carbon brush plate and the brush head of the carbon brush.

4. The infinite rotation unit for a 2-axis NC robotic arm according to claim 3, characterized in that, It also includes a gas path sealing assembly, which includes a first sealing unit and a second sealing unit, the first sealing unit and the second sealing unit being respectively disposed between the mating surfaces of the stator and the first rotor and the second rotor.

5. The infinite rotation unit for a 2-axis NC robotic arm according to claim 4, characterized in that, The output end of the drive source is driven to the input end of the transmission reduction component to increase the output torque of the drive source. The output end of the transmission reduction component is bolted to the upper end of the rotor through the first connecting plate. The lower end of the end cover is bolted to the 2-axis NC through the second connecting plate.

6. The infinite rotation unit for a 2-axis NC robotic arm according to claim 5, characterized in that, The carbon brush is made of a special material that is wear-resistant and has good electrical conductivity.

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