CN205154835U - Shaft -like structure that can stretch out and draw back in proportion - Google Patents

Abstract

The utility model is suitable for a machinery realizes stretching out and drawing back in proportion in order to make this structure, has adopted the spring of a set of mutual series connection, and the spring satisfies hooke law, and its elongation is directly proportional with the power that receives, again because each spring atress of establishing ties each other is equal, consequently uses a set of spring of establishing ties each other can make every spring have the flexible volume corresponding with rigidity. Spring rate's ratio can according to the flexible volume of each set section than calculating out, the structure can not only realize the characteristics that original structure can freely be stretched out and drawn back, every part can also have corresponding elongation according to given spring rate. The scalable shaft -like structure of utilizing this principles of design can realize every part and press the extension of given proportion under given general extension volume.

Description

A kind of rod-like structure that can stretch in proportion

Technical field

The utility model relates to a kind of rod-like structure can stretched according to set ratio, and this structure can be widely used on various engineering goods.

Background technique

At present, scalable rod-like structure common on market scarcely can realize stretching according to set ratio, and can realize in proportion flexible structure is power mainly with hydraulic pressure, and usage ratio valve realizes each several part evenly stretches.General scaler bar cannot realize evenly flexible, and there will be a certain joint and stretch out completely and phenomenon that other joints can not stretch out in time, the intensity distriubtion of whole member structure can be caused so uneven, and making to stretch out many parts easily weares and teares, and reduces working life.The hydraulically powered telescopic rod by proportional valve control is then relatively complicated, and each saves the oil hydraulic cylinder all needing oneself, and cost is higher.Spring meets Hooke's law, and its elongation is directly proportional to suffered power, and each spring stress again owing to mutually connecting is equal, therefore uses one group of spring of series connection mutually that each spring can be made to have the extending amount corresponding with rigidity.Utilize the scalable rod-like structure of this principle design can realize every part under given total elongation to extend in given ratio.

Summary of the invention

In order to overcome the situation that existing telescopic rod cannot evenly stretch in proportion, the utility model have employed one group of spring of mutually connecting, spring rate can calculate according to set often joint extending amount, this structure can not only realize the feature of original structure retractable, and each part can also have corresponding elongation according to given spring rate.

The utility model solves the technological scheme that its technical problem adopts: this structure is made up of four joints, often adjacent two joints are connected by three springs, spring rate can be determined on demand, arranges plug, mutually depart from when preventing two joints from stretching out long in the termination of adjacent two joints.Three springs along the circumferencial direction Central Symmetry of bar, and are placed in the inside of every pole, also increase the scalable amount of this structure while increasing connective stability.In order to every pole can be allowed to shrink back completely, the spring between an outmost joint and adjacent with it saves is placed on innermost layer, and an innermost pole is placed on outermost with the linking springs of the bar adjacent with him.

Set from outside to inside the ratio of the often given elongation of adjacent two joint as , then obtained by the character of serial spring

Thus draw

Accompanying drawing illustrates: Fig. 1 be the utility model provide can the structural representation of telescoping rod in proportion.In figure: 1, outmost first pole; 2, the second pole; 3, three pair rod; 4, the 4th pole; 5, the limiting stopper of three pair rod; 6, the limiting stopper of the second pole; 7, the limiting stopper of the first pole; 8, the plug of the root of the second pole; 9, the supporting structure 10 be connected with spring, spring and rod member attachment portion; 11, spring 1; 12, spring 2; 13, spring 3.

Embodiment: in FIG, 1,2,3,4 each joints each other can sliding extension, is provided with limiting stopper prevents from dropping at limit position.Limiting stopper is dismantled and assembled.Spring bottom and bar are by being welded together, and upper weld is on the strut be adjacent.Two often adjacent poles are linked together by three springs and corresponding supporting structure.

Claims (1)

1. the rod-like structure can stretched in proportion, is characterized in that, this structure is made up of four joints, and often adjacent two joints are linked together by three springs, and can realize in allowed limits being free to slide; Total is one group of serial spring on the whole, and under the elongation that total is set, often the extending amount of adjacent two joints is determined by the rigidity of the spring connecting them; In order to improve the scalability of total, spring is placed on the inside of steel pipe, each pole can be retracted in a pole adjacent with it completely.