SU655847A1 - Slewing mechanism - Google Patents

Description

(54) SWIVEL MECHASH13M

The invention relates to structural mechanics, in particular, to the mechanisms used for opening and closing the closures of bulk materials bins or as drives for turning devices of concrete mixers, hydraulic drive of an excavator bucket.

A rotary mechanism is known, comprising a shaft, an oscillating ram and a lever, one end of which is pivotally connected to the cylinder rod and the other is fixed on the shaft ij.

The axis of swing of the cylinder in a known mechanism is located approximately in the middle of its body.

In many rotary mechanisms, in particular, used for opening and closing the closures of bulk materials hoppers, it is important to create the maximum torque at the beginning of the turn and during the shaft rotation cycle by 90, to prevent a sharp decrease in the torque.

The known turning mechanism does not meet the specified requirements.

The purpose of the invention is to increase the efficiency of the mechanism.

For this, the proposed mechanism is provided with a lock for the end positions of the cylinder, and the axis of swing of the cylinder at the initial moment of rotation coincides with the axis of connection of the rod with the lever.

FIG. 1 shows a general view of the turning mechanism; in fig. 2 is a top view of the mechanism; in fig. 3 is a diagram of the action of forces in the proposed and previously known mechanisms.

Claims (2)

The rotary mechanism includes a Shaft 1, a power pneumatic or hydraulic cylinder 2 swinging on an axis 3 on which it is installed using lugs 4 fixed on the cylinder head cover 2. On the shaft 1 a lever 5 is fixed, the free end of which is pivotally connected to the cylinder rod 6 2. In one of the lugs 4, a radial slot 7 is made, which includes a latch 8. The proposed rotary mechanism works as follows. At the beginning of rotation of the cylinder 2 with the help of the lock 8 is set in such a position that its rod 6 forms a right angle with the axis of the lever 5. The torque applied to the lever 5 generated by the pressure of air or fluid in the cylinder 2 on its piston, in general, is defined by the formula () whereRs is the force on the rod; - distance from the shaft axis to the axis of connection of the rod with the lever; and - the angle of rotation of the lever; . / 2) "the angle between the rod and the axis of the lever, At the initial moment of rotation of the lever o (j O 5 D) 90 and the torque at the wheel is equal to red, therefore, in the proposed rotation mechanism, at the initial moment of rotation to the lever 5 it will apply a maximum torque, In the previously known turning mechanism, it is also possible to create such conditions that the axis of the lever at the initial moment of its rotation will be located at a right angle to the cylinder rod. However, as can be seen from the cxehtbi action of the forces in FIG. 3, Tangential component of the force P of the stem force, creating a torque on the lever, during the turning cycle of 90 in the proposed mechanism, will be greater than the force of the R. in the previously known. Therefore, the proposed rotary mechanism has a higher efficiency compared to other rotary mechanisms. Claims A rotary mechanism comprising a shaft, a swinging cylinder and a lever, one end of which is pivotally connected to the cylinder rod, and the other fixed to the shaft, characterized in that, in order to increase efficiency, the mechanism is provided with a cylinder end position lock and the swing axis of the cylinder at the initial moment of rotation coincides with the axis of connection of the rod with the shaft. Sources of information taken into account in the examination 1. Artobolevsky I. I. Mechanisms in modern technology, M., Nauka, 1971, p. 384, FIG. 14OO.  iJ 9g