(i) classification of bars
A silk bar is a moving secondary part that transforms rotational motion into a straight-line movement. Not only is a silk bar able to transmit movement accurately, but it also has to transmit power, so there are certain requirements in terms of accuracy, strength and millability, so each process from hair to finished product must be carefully considered in order to improve its accuracy。
Thrusts can be divided into three categories by their friction characteristics: slid wires, scroll wires and silent wires。
Swing wire bars are simple, easy to manufacture and are widely used on the floor. The spindles are mostly of a ladder, which has the advantage of being able to move better, more precise and easier to process than a triangle。
The rollers are divided into two categories: rollers and rollers。
The static cords have many advantages and are often used in the entry of precision and numerically controlled machine beds, with screwdrivers of the same type as those of standard ladders, with the aim of obtaining good oil seals and increasing carrying capacity. However, adjustments are cumbersome and require a hydraulic system, which is complex and costly。
(ii) characteristics and structure of silk bars1
The character of the rolling stock bars is:
The above figure is a roller-ball bar, consisting of roller-ball bars, roller-ball nuts and roller-balls. Rolling wire bars consist of threaded parts, bearing necks, etc. The roulette nut consists of a roulette nut, a cycling device, a seal, a lubricant, a penthouse element, etc. The ball shall consist of carrying ball rollers, space rollers, etc. The ball has two internal and external cycles。
2. Planetary rollers
Rolling wire is a relatively expensive drive, which is an order of magnitude more expensive than a roller wire and can be applied to high-precision, high-speed, heavy, durable applications. The principle is similar to a roller wire, which replaces a roller ball as a load transferer between a screw and a silk bar, usually with a screw. Within the given volume, the roller wire has more footholds than the roller wire, and under a quota load, the roller wire can be tighter. Roll wire bars are better than roller wire bars in terms of positioning accuracy, rated load, rigidity, speed, acceleration and useful life。
The structure of the planetary roller poles is as follows: around the main screwdrivers, the planet has 6 to 12 screwdrivers, and inside the roller nuts, small screwdrivers are colliding with the main wire bars, at a time when the nut structure is similar to the planet's gearbox. Numerous points of contact have made planetary roller poles very capable of carrying them。
The structure of the planetary roll-on cord is similar to that of the ball-rolling wire bar, which is distinguished by the fact that the ball-rolling cord load component is a screw-rolling column, which is typical of line contact, while the roller-ball load component is a ball, which is a point contact. The main advantage is that there are numerous points of contact to support the load, which can provide a nominal moving and static load higher than the rolling wall, and that a screwdriver instead of roller ball will allow the load to be released rapidly through multiple contact lines, thus providing a higher impact resistance。
The planetary roll bars can be divided into four categories: standard, reverse, circular and differential。
Standard planetary roller wire bars are also known as non-cycling roller poles, with rollers having no axle movement relative to the nut, and rollers are bound to the screws. The nut component consists of a gasket and gear that locates and directs the rolls, with an equidistance hole in the loops, and is used as a rotary bearing for the smooth core axis of the rolls。
The rolling poles of the reverse rolling poles have no axle motion relative to the silk bars, working in the same way as the standard rolling poles, except for the opposite function of the nuts and bolts. The roll moves in the inner axis of the nut, which is stretched to allow the movement of the entire axis. The back-rolling screws, which can function both as transmission parts and as transformers, are highly integrated and miniaturized and are truly integrated electric generators. Tesla optimus uses a reverse planetary roller liner to meet high load and miniaturization needs。
The rolling column of the circular roller line moves in the inner axis of the nut until it turns around and returns to its original position. Cyclops do not use gears, but recycling wheels with dents. The recycling wheel moves the axis along the rotation of a screw and a screwdriver, moving a screwdriver up or down after completion of a spiral. The nut component usually includes a tank maintenance frame and a cam ring. Keeps the shelf in a long slot where the rolling is evenly spaced between the rollings, thus providing the rollings with rotation and axle motion。
The differential roll-bars have a more compact structure than the standard planetary roll-bars, can withstand higher loads in the same volume and mass, and have higher input rotations and smaller guidance. Its structure is as shown in the figure below, and the differential scrolling bars convey the motion through the tangle of the scrolling column's large diameter segment with the screwdriver's screwdriver and the tangle of the small diameter segment with the screwring slot。
3. Silent cord
Silicon cords are a device that uses liquid static pressure principles for motion transfer and are widely used in various mechanical devices. The bar is made up of silk bars and nuts, which are external screws and inside screws. Put a force on a silk bar, and the nut moves along the silk bar axis. However, because of the greater friction between the nuts and the silk bars, greater effort is required to keep the nuts moving. In order to reduce friction, static cords introduce liquid static pressure。
Liquid static pressure is a principle that uses silent pressure generated by the liquid in a closed space to transmit and control. In the spinal cord, the static pressure of the liquid into the threaded gap of the silkbar will separate the nuts from the silk bar, reduce the friction between the threads and reduce the force required to drive the nut。
Specifically, when the liquid enters the thread gap of the silk bar through the pipeline, the pressure of the liquid creates a thin film between the threads, which is subject to the silent pressure of the liquid. The force generated by static pressure is vertically vertical and evenly distributed. The size of the liquid film changes when the nut is exposed to external force and moves towards the silk bar axis, thereby changing the size of the liquid silent pressure。
According to pascal's law, the pressure of the liquid is evenly distributed in a static state of pressure, so that in a static bar, the liquid static pressure is evenly applied at every point of the thread, and the external force is evenly passed to the thread and the silk bar. Thus, even in high loads, friction between screws and silk bars can be effectively reduced, thus reducing the strength required to drive the nut and increasing the speed of transmission。
The friction and speed of the static cord is proportional, at a low speed of almost zero, and the vibrational properties of the static cord completely eliminate the vibration and noise associated with the rolling cord. Therefore, static cords are more suitable for situations requiring higher thrust and frequent vibration loads。
(iii) difficulties in the production of planetary rollers
The silk bar material is 42 crmo for alloy structural steel and high carbon chromium bearing steel and low material barriers。
The screwdriver is a key part of the movement, and the formation process and product quality directly determine the performance of the planetary roller pole. When the planetary roller poles are working, multiple threaded rollers bear the load together to avoid the loss of any screwdrivers due to overloading. In the planetary screw roller column, the main task of the middle screwdriver is to transfer loads, the gears part and the fixed rings within the nut。
The manufacturing process is critical to the reduction of errors, such as the main physical deviations, manufacturing errors, installation errors, etc. The manufacturing chain consists of a screwdriver length, a screwdriver type, a gear length, a gear length, and a eccentricity, with very high precision requirements for manufacture。
The energy loss of the planetary roller-bard transmission system is mainly due to friction resistance of its key components. These include, inter alia, antagonal exposure bearings to friction, swidths and spinal screws on the side of the roller column, rolling poles and screws on the side of the nut, rolling rods and inner cortex frictions, as well as loss of rotational frictions between frame and ball bearings, and screws。
The processing precision of the planetary roller wreaths directly affects the moving accuracy, useful life and stability of the system. The planetary roller wreaths are designed for specific parameters, and the manufacturing process consists mainly of formed processing, such as cyclone grinding, grinding, hard car cutting, rolling formation, etc。
(iv) the planetary roller-wire industry
The constant hydraulic pressure in 2021 increases the layout linear drive with a roller wire and planetary roller。
The qinchuan machine bed rollers have already been produced in quantitative terms and have the capacity to produce rollers。
A milestone was achieved in the mini-planetary roller pole with the linear implementer market being the second highest in the world after hayden kirk in the united states。
Bester, tesla motors vendor, has been set up with high-precision rollers。
Prosperous bearing, tesla ii supplier, with human-shaped robot roller wire capacity。
