High-precision slip ring suitable for ultra-long service life

Abstract

The utility model is applicable to the technical field of slip rings, and provides a high-precision slip ring applicable to ultra-long service life, which comprises a rotor part and a stator part, and is characterized in that the rotor part comprises a main shaft and a bearing fixed on the side wall of the main shaft; the stator part comprises a protective cover and a shell fixed on the protective cover; the side wall of the bearing is fixed on the shell; a first air circulation pipeline is arranged in the main shaft, an air inlet hole is formed in the main shaft, and the air inlet hole is communicated with one end of the first air circulation pipeline. A pipeline of the fan is connected with an air inlet hole of the main shaft, first air circulation pipelines are evenly distributed on the main shaft below the conducting ring, cold air flows to the first air circulation pipelines through the air inlet hole, the conducting ring, the gold-plated row brush and the bearing are cooled firstly, and then the cold air passes through a second air circulation pipeline connected with the shell to cool the conducting ring and the gold-plated row brush. Cold air enters the stator to cool the brush carrier, and finally the air is exhausted from the two sides of the stator side protection cover, so that a circulating cooling system is formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of slip rings, and in particular relates to a high-precision slip ring suitable for an ultra-long working life. Background Art

[0002] Slip ring lifespan is a key factor in measuring slip rings. Since they are consumables, the rotor and stator rub against each other, and the lifespans specified by various companies vary. Slip rings are commonly used in systems requiring relative rotation to transmit signals and currents. Currently, a variety of 3D data acquisition methods and tools are emerging, driving the development of 3D spatial data acquisition towards real-time, integrated, digital, intelligent, and dynamic capabilities. Laser scanning technology offers a new means of acquiring rich spatial information. However, due to the complexity of the scanned objects or scenes and the limitations of the 3D laser scanner's inherent field of view and scanning range, each scan can only capture point cloud data for a specific portion of the object or scene. To obtain complete point cloud data, the object or scene must be scanned from different locations. During the scanning process, accuracy is often down to the millisecond level, enabling the instantaneous capture of high-speed moving targets.

[0003] Laser scanning systems are expensive and require long periods of uninterrupted operation. Therefore, in order to achieve 360° long-term unlimited rotation of the laser scanning system to quickly send and receive signals, a high-speed, long-life slip ring needs to be installed in the laser scanning system to ensure smooth and uninterrupted transmission of signals and currents during the rotation of the control system.

[0004] Because 3D scanner slip rings require high speeds and a long lifespan, they are typically designed as standard. The protective covers commonly used in the industry are made of aluminum alloy. High-speed operation generates high temperatures, which must be quickly transferred to the protective cover for heat dissipation. The typical solution is to place the slip ring in a low-temperature environment and cool it with cold air. However, this cooling method is only suitable for operating speeds above 5000 rpm. If the operating speed exceeds 5000 rpm, the temperature rise will cause the 3D scanner equipment to fail, resulting in the laser scanning system not functioning properly.

[0005] To extend the lifespan and environmental adaptability of slip rings, other competitors in the industry, based on the operational requirements of 3D scanners, often use a design approach that installs a bearing on both the rotor and stator. Because the product's rotor needs to operate in conjunction with the customer's equipment, high-speed operation generates significant centrifugal force, which can easily damage the bearings and, in turn, affect electrical signal transmission. Because laser scanning systems scan high-speed objects and provide data to a central processing unit for analysis, 3D scanner slip rings must meet the economical requirements of the laser scanning system, specifically their service life. Because the object signals captured by laser scanning systems are fleeting at the microsecond level, 3D scanner slip rings must operate at high speeds. This can easily lead to excessive bearing overload due to the centrifugal force generated by high-speed rotation, increasing the risk of failure. Utility Model Content

[0006] The purpose of the embodiments of the utility model is to provide a high-precision slip ring suitable for ultra-long working life, aiming to solve the problem that the existing slip ring has poor heat dissipation and causes the slip ring to be unable to rotate continuously at high speed.

[0007] The utility model is implemented as follows: a high-precision slip ring suitable for ultra-long working life includes a rotor part and a stator part, the rotor part includes a main shaft and a bearing fixed on the side wall of the main shaft; the stator part includes a protective cover and an outer shell fixed on the protective cover; the side wall of the bearing is fixed on the outer shell; an air circulation duct 1 is provided in the main shaft, an air inlet is provided on the main shaft, and the air inlet is connected to one end of the air circulation duct 1; an air circulation duct 2 is provided in the outer shell, one end of the air circulation duct 2 is connected to the other end of the air circulation duct 1; the other end of the air circulation duct 2 extends into the protective cover, and the protective cover is provided with an air outlet; a connecting block is rotatably connected to the main shaft, and the air inlet on the main shaft is connected to the pipe of the fan through the connecting block; and a rotating communication system is also included, and the rotating communication system is provided between the side wall of the main shaft and the inner wall of the protective cover.

[0008] According to a further technical solution, a plurality of annular grooves are evenly arranged on the side wall of the protective cover, which increases the contact area between the protective cover and the airflow during air convection.

[0009] A further technical solution is that the rotating communication system includes multiple conductive rings and multiple insulating sheets mounted on the main shaft, the multiple conductive rings and multiple insulating sheets are arranged in sequence at intervals, and the insulating sheets and the conductive rings form a "U"-shaped groove; a brush holder is fixed on the outer shell, and a gold-plated row brush is fixed on the brush holder by welding with a special jig.

[0010] According to a further technical solution, the insulating sheet is made of a high and low temperature resistant material, the conductive ring and its contact material are made of imported copper, and the surface of the conductive ring is treated with a gold plating process.

[0011] A further technical solution is that the gold-plated brush is made of imported copper material.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The utility model provides a high-precision slip ring suitable for ultra-long working life. The slip ring shell structure is made of high-quality aluminum alloy and has a gold-to-gold multi-contact structure. The protective cover is designed in a groove shape. The high-low pressure drop principle is used to conduct the temperature rise generated by high-speed rotation to the metal protective cover for effective heat dissipation. The rotor and stator are provided with two air inlet and outlet holes. Through the pipe connected to the fan, compressed air enters the slip ring for circulation, cooling the internal components, especially the slide and bearings. The scheme adopts high-strength and wear-resistant materials to make the slide and brush, uses imported high-speed precision bearings, and adds a special slide lubrication process. This ensures that the slip ring has an ultra-long working life of more than 300 million at a speed of 12,000 rpm, meeting the requirements of stable transmission of electrical signals of the laser scanning system during high-speed movement. The metal protective cover has a smooth surface and dissipates heat. The surface is cooled by blowing air. The rotor and stator have a single bearing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of a high-precision slip ring suitable for ultra-long working life provided by the utility model;

[0015] Figure 2 The utility model provides Figure 1 Schematic diagram of the internal structure of the spindle, protective cover and outer shell.

[0016] In the accompanying drawings: air inlet 1, connecting block 2, main shaft 3, bearing 4, conductive ring 5, insulating sheet 6, gold-plated brush 7, brush holder 8, air outlet 9, protective cover 10, outer shell 11, air circulation duct 1 12, air circulation duct 2 13, annular groove 14. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0019] like Figure 1 and Figure 2As shown in the figure, a high-precision slip ring suitable for ultra-long working life provided by an embodiment of the present invention includes a rotor part and a stator part. The rotor part includes a main shaft 3 and a bearing 4 fixed on the side wall of the main shaft 3; the stator part includes a protective cover 10 and a shell 11 fixed on the protective cover 10; the side wall of the bearing 4 is fixed to the shell 11; an air circulation duct 12 is provided in the main shaft 3, an air inlet hole 1 is provided on the main shaft 3, and the air inlet hole 1 is connected to one end of the air circulation duct 12; an air circulation duct is provided in the shell 11 The air circulation duct 13 is connected to the air circulation duct 12 at one end; the other end of the air circulation duct 13 extends into the protective cover 10, and the protective cover 10 is provided with an air outlet 9; the main shaft 3 is rotatably connected to the connecting block 2, and the air inlet 1 on the main shaft 3 is connected to the pipe of the fan through the connecting block 2, and the compressed air enters the interior of the slip ring for circulation, thereby cooling the internal components, especially the slideway and bearings; and also includes a rotary communication system, which is arranged between the side wall of the main shaft 3 and the inner wall of the protective cover 10.

[0020] In an embodiment of the present invention, the slip ring is applied to a 3D scanning instrument and installed in a laser scanning system. Typically installed at the center of rotation of the device, the slip ring consists of two main components: a rotating component and a stationary component. The rotating component connects to the device's rotating structure and rotates with it, known as the "rotor." The stationary component connects to the device's fixed structure, known as the "stator." By attaching the slip ring to a 360° rotating device, power and signals can be supplied to the device via stator and rotor conductors.

[0021] During operation, the stator of the terminal device secures the protective cover 10, and the rotor's main shaft 3 is connected to the terminal device's rotating shaft. Using the principle of elastic lap joints, the conductive ring 5 of the main shaft 3 and the stator's gold-plated brushes 7 form a stable and reliable rotating connection system. During continuous operation, the fan's duct is connected to the air inlet 1 of the main shaft 3. Two air circulation ducts 12 are evenly distributed below the conductive ring 5 of the main shaft 3. Cold air flows through the air inlet 1 into the air circulation duct 12, first cooling the conductive ring 5, the gold-plated brushes 7, and the bearing 4. Then, through the air circulation duct 2 13 connected to the outer casing 11, the cold air enters the stator to cool the brush holder 8. Finally, the air is discharged on both sides of the stator protective cover 10, forming a circulating cooling system. This combination of internal and external heat dissipation protects the slip ring at an operating speed of 12,000 rpm, minimizing physical damage to components caused by temperature rise and delaying component wear, ensuring the quality and reliability of an extremely long service life of over 300 million.

[0022] like Figure 1 and Figure 2As shown, as a preferred embodiment of the present invention, a plurality of annular grooves 14 are evenly arranged on the side wall of the protective cover 10. When the air is convective, the contact area between the protective cover 10 and the airflow is increased, thereby improving the heat dissipation performance of the protective cover 10 and facilitating the heat dissipation inside the protective cover 10. The protective cover 10 is designed as annular grooves 14, and the temperature difference principle during air convection is used to quickly dissipate the heat conducted to the protective cover 10.

[0023] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, the rotating communication system includes a plurality of conductive rings 5 ​​and a plurality of insulating sheets 6 mounted on the main shaft 3. The plurality of conductive rings 5 ​​and the plurality of insulating sheets 6 are arranged in sequence, so that two adjacent conductive rings 5 ​​are separated by the insulating sheet 6. The insulating sheet 6 and the conductive ring 5 form a "U"-shaped groove. This design can increase the creepage distance between adjacent conductive rings 5 ​​and further enhance the reliability of the slip ring insulation; a brush holder 8 is fixed on the housing 11, and a gold-plated brush 7 is fixed to the brush holder 8 by welding with a special jig to ensure assembly consistency. The gold-plated brush 7 is in contact with the conductive ring 5.

[0024] like Figure 1 and Figure 2 As shown in FIG. 1 , as a preferred embodiment of the present invention, the insulating sheet 6 is made of a high and low temperature resistant material, the conductive ring 5 and its contact material are made of imported copper, the high hardness ensures the wear resistance of the slip ring and improves the service life of the slip ring, and the surface of the conductive ring 5 is treated with a gold plating process. Gold is the metal with the best conductivity among known solid metals. The conductive ring 5 treated with the gold plating process further improves its surface smoothness, conductivity and contact performance.

[0025] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present invention, the gold-plated brush 7 is made of imported copper material, which has high strength limit, elastic limit, yield limit and fatigue resistance limit comparable to special steel, and at the same time has high electrical conductivity, thermal conductivity, high hardness, corrosion resistance, wear resistance, good casting performance, non-magnetic and impact-free spark characteristics.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision slip ring suitable for ultra-long service life, comprising a rotor part and a stator part, characterized in that: The rotor portion includes a main shaft and bearings fixed on the side wall of the main shaft; The stator part includes a protective cover and a shell fixed on the protective cover; The bearing side wall is fixed to the housing; An air circulation pipe 1 is provided in the main shaft, and an air inlet hole is provided on the main shaft, and the air inlet hole is connected to one end of the air circulation pipe 1; An air circulation duct 2 is provided in the housing, and one end of the air circulation duct 2 is connected to the other end of the air circulation duct 1; The other end of the second air circulation pipe extends into the protective cover, and the protective cover is provided with an air outlet; A connecting block is rotatably connected to the main shaft, and the air inlet on the main shaft is connected to the pipe of the fan through the connecting block; The invention also includes a rotation communication system, which is arranged between the side wall of the main shaft and the inner wall of the protective cover.

2. The high-precision slip ring suitable for ultra-long service life according to claim 1, characterized in that: A plurality of annular grooves are evenly arranged on the side wall of the protective cover, which increases the contact area between the protective cover and the airflow during air convection.

3. The high-precision slip ring suitable for ultra-long service life according to claim 2, characterized in that: The rotary communication system includes a plurality of conductive rings and a plurality of insulating sheets mounted on the main shaft, wherein the plurality of conductive rings and the plurality of insulating sheets are sequentially spaced apart, and the insulating sheets and the conductive rings form a "U"-shaped groove; A brush holder is fixed on the shell, and a gold-plated row of brushes is fixed on the brush holder by welding with a special fixture.

4. The high-precision slip ring suitable for ultra-long service life according to claim 3, characterized in that: The insulating sheet is made of high and low temperature resistant material, the conductive ring and its contact material are made of imported copper material, and the surface of the conductive ring is processed by gold plating process.

5. The high-precision slip ring suitable for ultra-long service life according to claim 3, characterized in that: The gold-plated brush is made of imported copper material.

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