Now many machinery manufacturers, are choosing to use injection molding machine manipulator as the main production mode, but the use of automatic manipulator in production can improve the production efficiency and product quality and reduce the production cost of products are greatly improved, in the production of injection molding machine manipulator can work accurately, in fact, is a three-dimensional space positioning problem. It is a combination of a number of linear and angular positioning. In many simpler cases, a single magnitude value may be dominant. The factors that affect the positioning error of a single linear or angular quantity are as follows:

1. Positioning mode — — Different positioning methods affect different factors. For example, when mechanical block is positioned, the positioning accuracy is related to the stiffness of the block and the speed when touching the block.

2. Positioning speed — — Positioning speed has a great influence on positioning accuracy. This is because when the positioning speed is different, the energy of the moving parts that must be dissipated is different. Generally, in order to reduce the positioning error, the positioning speed should be reasonably controlled, such as improving the buffering performance and buffering efficiency of the buffer device, and controlling the driving system to slow down the moving parts in time.

3. Precision — — The manufacturing accuracy and installation speed adjustment accuracy of the manipulator have a direct impact on the positioning accuracy.

4. Stiffness — — When the structural stiffness and contact stiffness of the manipulator itself are low, the positioning accuracy is generally low because of easy vibration.

5. Weight of moving parts — — The weight of the moving part includes the weight of the manipulator itself and the weight of the object being grabbed. The change of the weight of the moving part has a great influence on the positioning accuracy. Usually, when the weight of moving parts increases, the positioning accuracy decreases. Therefore, the design should not only reduce the weight of the moving parts themselves, but also consider the impact of the change of grip weight when working.

6. Driver source — — Hydraulic pressure, air pressure fluctuation and voltage, oil temperature, temperature fluctuation will affect the repeated positioning accuracy of the manipulator. Therefore, the necessary pressure regulation and oil temperature regulation measures are adopted. Such as the accumulator to stabilize the oil pressure, with the heater or cooler to control the oil temperature, low speed, with the temperature, pressure compensation flow control valve control.

7. Control system — — The position control accuracy of switch control, electro-hydraulic proportional control and servo control is different. This is not only because the accuracy and sensitivity of various control elements are different, but also related to the presence or absence of position feedback devices.

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