1 Introduction
With the increased industrial automation of modern production, customers are increasingly demanding automation, high efficiency and high precision transmission. Many traditional transmission methods are not suitable for the needs of the current industry, and the demand for high-precision transmission products such as ball screws is increasing in the market. Ball Screw is the most commonly used transmission component in machine tools and precision machinery. Its main function is to convert rotary motion into linear motion, or to convert torque into axial repetitive force, with high precision, reversibility and high. The characteristics of efficiency.
In the traditional pharmaceutical industry, the gap between the tablet presses and the tablet presses is basically manual operation, the adjustment accuracy is poor, and the efficiency is low, which seriously restricts the production capacity of the pharmaceutical factory. The customer's willingness to change the structure is very strong. For design engineers, how to choose the right positioning accuracy and choose a cost-effective ball screw is a very important and imperative work.
2 basic requirements of the lead screw
(I) Direction of movement: vertical direction
(II) Load size F: no external pressure condition: 20~30KG
Additional pressure: 1000KG
(III) Operating speed Nm: running at a constant speed, 10 rpm
(IV) Lead lead P: 5mm
(V) Accuracy requirement E: cumulative deviation within 50mm <0.02mm
(VI) Effective stroke L: 120mm
3 customer structure
The customer's previous structure mainly uses manual mode for power transmission and positioning.
The working principle of the mechanism: a hand wheel is arranged at one end of the worm, the hand wheel is rotated to drive the worm to rotate, and then the worm gear is driven by the worm gear, the helical gear is restrained in the upper and lower ends of the axial direction, and can only be rotated, and the same nut Integrally, through the rotary motion of the helical gear and the nut, the lifting rod with a diameter of M22mm is driven to make a linear motion of ascending or descending. After moving to the required process position, the lifting rod stops moving, and the pressing action starts. During the pressing operation, the maximum pressure of the pressing wheel is 1 ton. When the type of pressure is needed to be replaced, manually adjust the lifting rod to raise or move straight to the other station.
From the analysis of the movement mechanism, the mechanism is designed to meet the requirements of use. But the shortcomings are also very obvious:
(1) Manually adjust the rising or falling distance, and the degree of automation is very low.
(2) The lifting rod and the helical gear of the external processing are non-standard products, and the manufacturing precision is difficult to guarantee.
(3) Low work efficiency. Because the body of the tablet is relatively small, the required thickness and thickness are relatively high, and can only be adjusted through multiple tests.
4 Improvement requirements
Based on the above shortcomings, the customer expects to upgrade the equipment grade, the operation is more flexible and fast, and meets the following requirements:
(1) Improve the flexible production capacity of equipment and quickly respond to the production of different specifications of tablets.
(2) Improve the adjustment efficiency, reduce the number of tests, and increase the success rate.
(3) Positioning accuracy requirement ≤0.02mm
5 improved structure
In response to customer improvement requirements, the customer has adjusted the structure: abandoning the manual operation device to a fully automated operation and control device while achieving more precise positioning requirements. To this end, the customer has made structural improvements to the equipment.
Motion mechanism analysis: After the improvement, the servo motor 11 drives the connection room 15, and then the connection of the key and the nut 3 drives the nut to rotate. The nut is restrained in the axial direction and cannot be linearly moved, thereby driving the ball screw 8 to perform linear motion. . In turn, the gap between the adjusting roller and the pressure plate is adjusted to control the thickness of the tablet.
The benefits of the above structure are also very obvious:
(1) The ball screw movement is driven by the servo motor, instead of the manual rocker, the operation is simple and convenient, and the degree of automation is improved.
(2) Achieve higher transmission accuracy by selecting high-precision ball screws.
(3) Responding to different tablets, the production requirements can be met relatively quickly, and the flexibility is strengthened.
The main difficulties in structural improvement are:
(1) The space for assembling the screw is relatively small.
(2) Unlike the traditional screw rotation, the nut makes a linear motion; the customer requires the nut to rotate and the lead screw to move in a straight line.
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