What spare parts are needed for the automatic stator-rotor assembly machine of brushless motor and how to set up the guarantee stock?
Brushless motor motor automatic stator-rotor assembly machine's normal operation can not be separated from the support of spare parts, the following is a detailed introduction to the common spare parts needed and how to set up the protection of stock.
Required spare parts
I. Machinery
1、Transmission parts
Belt: The belt will be worn, elongated or broken after a long time of use, so it is necessary to reserve different specifications of the triangle belt, synchronous belt, etc. to ensure the normal operation of the transmission system.
Chain: Chain will be worn out in the transmission process, resulting in chain elongation, tooth jumping and other problems, need to prepare the appropriate pitch and type of chain.
Coupling: coupling is used to connect the motor and transmission components, when there is vibration, impact and other conditions may be damaged, reserve different types (such as flexible coupling, rigid coupling) and specifications of the coupling is necessary.
2、Molds and fixtures
Stator positioning mold: In the process of assembling, the stator positioning mold will be in frequent contact with the stator, which is prone to wear and tear, affecting the positioning accuracy, so it is necessary to prepare a spare mold.
Rotor clamping fixture: rotor clamping fixture to ensure reliable clamping of the rotor, long-term use of wear and deformation may occur, need to reserve a certain number.
Bearing: the rotating parts in the equipment such as motor shaft, screw, etc. need bearings to support, the bearings will be worn out during operation, reserve bearings with different ID, OD and accuracy level, so that the damaged bearings can be replaced in time.
Second, electrical category
1、Sensor
Position sensor: used to detect the position of the stator and rotor, to ensure the precision of assembly, common photoelectric sensors, proximity sensors, etc., need to be stocked with different detection distance and type of sensor.
Pressure sensor: monitoring the pressure in the process of pressing and assembling, to ensure that the pressing and assembling force in line with the process requirements, once the damage will affect the quality of assembly, should be stocked with spare sensors.
2、Electrical control components
Contactor: used to control the motor start, stop and forward and reverse, etc., frequent on and off operation will make the contactor contacts wear, need to reserve different rated current and voltage contactor.
Relay: in the electrical control system to play the role of signal conversion and control, long-term use may fail, need to prepare a certain number of relays.
Fuses: when the circuit overload or short circuit, the fuse will fuse to protect the electrical equipment, should be stocked with different rated current fuse.
3、Motor and drive
Servo motor: provide power for the movement of the equipment, if the motor failure will lead to equipment can not run normally, need to reserve power and model matching servo motor.
Motor driver: control the motor speed, torque and other parameters, and motor supporting the use of reserves of the appropriate drive can be timely replacement of faulty parts.
Safeguard the inventory setup method
I. Statistical history data
Collect the replacement records of spare parts in the past period of time (e.g., one year or several years) of the equipment, including the replacement time, replacement quantity, causes of failure and other information. Through the analysis of these data, understand the use of each spare part frequency and replacement pattern.
For example, statistics found that a certain type of belt is replaced once every three months on average, and the number of each replacement is 2, which provides an important basis for the subsequent protection of inventory settings.
Second, consider the supply cycle
Communicate with the suppliers of spare parts to understand the supply cycle of each spare part, that is, the time required from placing an order to receiving the goods. The supply cycle is affected by the supplier's production capacity, transportation distance and other factors.
For a longer supply cycle of spare parts, such as some imported high-precision sensors, need to set a higher guarantee inventory to avoid equipment downtime due to out-of-stock.
Third, analyze the degree of impact of failure
Evaluation of each spare parts failure on the degree of impact of equipment operation. For those once the failure will lead to equipment downtime for a long time, affecting the production schedule of the key spare parts, such as servo motors, stator positioning molds, etc., should be set up to protect a higher level of inventory.
For some of the less impact on equipment operation, can be repaired or replaced in a short period of time spare parts, such as ordinary relays, the guaranteed inventory can be relatively low.
Fourth, the use of mathematical modeling
Quantitative methods can be used, such as the economic order quantity (EOQ) model, the guaranteed inventory formula, combined with historical data, supply cycle and the degree of impact of failure and other factors, to calculate the number of guaranteed inventory of each spare part.
Guaranteed inventory formula:, which is the guaranteed inventory, for the guarantee coefficient (determined according to the enterprise's ability to withstand the risk of stock-outs), for the standard deviation of demand (reflecting the fluctuations in demand), for the supply cycle.
V. Regular assessment and adjustment
Guaranteed stock is not static, it needs to be assessed and adjusted regularly. With the use of equipment, changes in suppliers and the adjustment of production plans, the demand for spare parts will also change.
For example, if equipment undergoes technical modifications and certain spare parts are used less frequently, their guaranteed inventory can be appropriately reduced; conversely, if the failure rate of a certain spare part is found to be increasing, its guaranteed inventory should be increased in a timely manner.
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