Where is the rocker mechanism used?

2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16

If we talk about the rocker mechanism, then it’s worth starting with the fact that “rocker” is a French word that can be translated into our language as “detail” or “link”.

General information

From a technical point of view, a rocker mechanism is understood as a device whose task is to convert rotational or rocking motion into reciprocating. However, this mechanism can also perform the opposite function. If we talk about the general classification of this device, then it can be of three types - this is a rotating type, a swinging type or moving in a straight line. However, if you understand the essence of the rocker mechanism, it becomes clear that any of its varieties can be attributed to the lever type of devices. In addition, it is important to note that the backstage work is carried out in tandem with another part, which is called a slider. This part is also a rotating part in the overall design of the movement.

Benefits and material

The main advantage of this mechanism is to ensure a fairly high speed of the slider, which it develops during the reverse stroke. This advantage has led to the fact that such a device has become very widely used in equipment that has an idle return. In addition, if we compare the rocker mechanism with the crank, for example, then the first is able to transmit much less effort compared to the second.

Most often, the link device is used in order to convert the uniform rotational movement of the crank into the rotational movement of the backstage itself as efficiently as possible. It should be noted that this movement is carried out unevenly. However, there are times when the movement of the wings will still be uniform. Most often this happens if the distance between the crank bearings and its link is equal to the length of the crank itself. In such a system, the rocker mechanism will also be a crank mechanism, which is equipped with a rocker with uniform movement.

Design and distribution mechanism

To date, the most common backstage design is a four-link. In addition, all structures of this type can be classified into several groups, depending on what type the third link is in the device. There are such classes as: two-link, rocker-slider, rocker-rocker, crank-rocker.

Most frequentthese mechanisms are used in various types of machines, such as gear shaping, cross-planing and other machines that can be attributed to metal-cutting types. The essence of the rocker mechanism is that this is one of the many varieties of the crank mechanism. The use of a mechanism with a link is resorted to if there is a need for equipment to convert rotational motion into reciprocating. In planer types of machines, a rocking type of the link is used, and in slotting machines, a rotary type link is installed.

Four-link mechanism design

The four-link scotch rocker mechanism is a system that can be seen on the example of a planer where this type of device is used. The operation of this system can be described as follows. The crank carries out a circular motion around the axis through the link stone, thereby inducing the link to perform a rocking motion. However, at the same time, if you look at the movement of the rocker relative to the rocker, then it will already perform a reciprocating movement. This type of device is also often used in hydraulic pumps, which have rotary-type mechanisms with rotating blades. In addition, the four-link mechanism has found its application among various hydraulic and pneumatic drives. In this case, the design involves an input piston on a connecting rod that slides in a rotating or rocking cylinder.

Slide mechanism

This mechanism model is most often used in laboratory conditions, and is also used for training and familiarization with this device in educational laboratories in disciplines such as applied and theoretical mechanics.

It is worth mentioning that the fairly widespread multi-link rocker-slider mechanism is quite large. This is due to the fact that the design of the second connecting rod with the slider runs lower than the straight arrangement of the link rod. Such a design feature suggests that the beginning of the connecting rod will pass lower than the rocker-lever device itself. This, in turn, suggests that such a mechanism must have a high base or bed, which means that it will be necessary to spend more money on its creation, since excess material is spent on creating such a bed. It is worth noting that it is this factor that is considered the biggest problem and the main drawback of the entire system as a whole.

Toggle linkage

The toggle mechanism is an invention that has found its application in the field of mechanical engineering. The main task of this system is to convert the reciprocating motion into an all-wheel drive rotary motion. The purpose with which this mechanism was invented was to increase the life of the system, as well as to increase its coefficient of performance, or efficiency. In addition, the following goals were also pursued,as an extension of the possibilities in the field of kinematics, due to the fact that the system was supplied with a second stage, and the links of the system were performed differently.

Crank mechanism

After the invention of this system, it began to be attributed to articulated-lever mechanisms that have hydraulic devices or pneumatic devices, and the purpose of their use was ventilation in warehouses. The design of this mechanism is quite simple, and it contains three main elements: a rack, a crank and a rocker. The task that was set before the inventors of this device is to improve reliability while simplifying the design of the mechanism. The prototype for the invention of this model was hydraulic or pneumatic mechanisms, which also used the wings with translational motion. In addition, the design also included a rack, a slider, a crank.

Repair

Like any other mechanism, rocker also has its own service life. After this service life, it is time to repair the rocker mechanism. However, it also happens that the device goes out of service ahead of schedule. Most often, in this mechanism, such parts as the rocker, rocker, gear, screws and nuts for moving the crawler, as well as the crawler itself with a finger, wear out or wear out. If the surfaces of the grooves of the wings are worn by more than 0.3 mm, and they also have deep scratches, then milling is used as a repair, followed by scraping. If the wear is not too strong, you can get around only by scraping, withoutmilling.

If the link wears out, then as a repair, the walls of the groove are first put in order. When carrying out work, they most often focus on those areas that are less worn than others.