Hydraulically powered automatic grinding shaft for robot

Abstract

The invention provides a hydraulically powered automatic grinding shaft for a robot. The hydraulically powered automatic grinding shaft for the robot comprises a spindle, a shell, a front end cover assembly and a rear end cover assembly. The input end of the spindle is connected with a hydraulic device, the output end of the spindle is connected with a grinding wheel device, and the hydraulic device is connected with the spindle through an elastic coupling and drives the grinding wheel device to rotate so as to achieve grinding work. The outer side of the shell is connected with the robot, the spindle is sleeved with the shell, and a plurality of bearings are arranged between the two ends of the interior of the shell and the spindle respectively. Two bearings mounted back to back are arranged between the spindle and the shell and are close to the side where the input end of the spindle is located. Two sets of bearings are arranged between the spindle and the shell and are close to the side where the output end of the spindle is located. Each set of bearings comprises at least two bearings connected in series. The adjacent two sets of bearings are mounted back to back, and the two sets of bearings are spaced through a spacer bush. The spindle is sleeved with the front end cover assembly and the rear end cover assembly, and the front end cover assembly and the rear end cover assembly are mounted at the two ends of the shell respectively. The hydraulically powered automatic grinding shaft for the robot has the advantages of being high in power, simple in structure, low in weight, reliable in performance and the like and is applicable to the robot.

Description

Technical field [0001] The invention relates to the technical field of grinding shaft design, in particular to a hydraulically driven robot automatic grinding shaft. Background technique [0002] At present, pneumatic tools are commonly used for manual grinding, which has problems such as low cutting force, low processing efficiency, and harsh working environment. The efficiency of automatic polishing can reach more than 6 times that of manual polishing, and the economic benefits are good. It is in the early stage of development in China. Higher grinding efficiency requires more powerful grinding tools, pneumatic tools and can not meet the requirements. Robot grinding tools are limited by the load capacity of the robot, and the grinding tools are required to have a compact structure and a large power-to-weight ratio. Electric spindles with a power of more than 15kW weigh more than 70 kg and are expensive. Therefore, it is necessary to develop a lightweight and high-power grind...

AI Technical Summary

Problems solved by technology

[0004] 1. The grinding spindle adopts an electric spindle, which has a compact structure and high speed; the 3-10kW electric spindle can well meet the requirements when grinding small flash burrs; but this type of grinding spindle has the following disadvantages: 1. ) The motorized spindle is relatively precise, the production process requires high requirements, and there are not many manufacturers that can produce it; 2) The motorized spindle needs a special cooling and lubrication system, which increases the system cost; 3) The life of the motorized spindle bearing is not long enough; 4) The motorized spindle rotates at a high speed But the torque is small, resulting in small cutting force and low grinding efficiency; 5) The maintenance of the electric spindle is complicated, and it is generally maintained by the manufacturer

[0005] 2. The main shaft for grinding is in the form of a mechanical power head plus an electric motor. Whether it uses a three-phase asynchronous motor or a permanent magnet synchronous motor, the weight exceeds 50kg when the power is 10kW. In addition to the weight of the mechanical power head itself, the robot load It has exceeded 100kg, which restricts the power of grinding tools

[0006] 3. The utility model with the authorized announcement number CN201483314U discloses a special hydraulic spindle for track plate grinding machines; this type of grinding spindle has the following disadvantages: 1) The technical solution is for machine tools, not for robots; 2. ) This technical solution adopts the seal when in contact, so that the spindle speed is limited; 3) The grinding wheel is pressed against the grinding wheel sleeve by the pressure plate; 4) The open hydraulic system is used, and the system efficiency is low

[0007] 4. The utility model with the authorized announcement number CN2214863Y discloses a steel billet grinding machine grinding head; this type of grinding spindle has the following disadvantages: 1) The technical solution is a spindle used for machine tools rather than robots; 2 ) The bearing system is complex and difficult to manufacture; 3) Contact seal, the spindle speed is low; 4) The hydraulic motor and the spindle are connected by a key, which is a rigid connection; 5) The grinding wheel seat and the spindle are connected by a cylindrical shaft end and a key; Installed in the form of a pressure plate; 7) The bearing is lubricated with oil, which requires a lubricating oil pump and a lubricating pipeline

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