SU918026A1 - Indexing apparatus - Google Patents

Description

(5) WORKING DEVICE

one

The invention relates to the field of mechanical engineering and can be used in rotary tables.

Known divider devices, including a faceplate mounted on the base, a faceplate fixation mechanism, made in the form of two flat gear disks, one of which is mounted on the faceplate and the other on the base of l.

A disadvantage of the known devices is the increased wear of the contact, the rutting surfaces of the teeth when fixing the faceplate.

The purpose of the invention is to increase the durability and accuracy of the device.

To do this, the device is equipped with a mechanism for pre-orientation of the faceplate, made in the form of two flat toothed disks mounted on the faceplate and the base coaxially with the locking mechanism disks, we will take the cavities of the disks of the pre-orientation mechanism

coal and at the time of fixation of the depression and the tooth of the mechanism of preliminary orientation are located with a guaranteed clearance.

Figure 1 shows the proposed separating device, figure 2 drives the mechanisms of pre-orientation and fixation of the faceplate (possible options and stages of fixation); in FIG. 3, the shape of the teeth of the disk of the mechanical mechanism of preliminary fixation.

The separating device consists of a base 1, in which the axis 2 of the faceplate 3 is located, the lifting cylinders and the clamping of the plan15 of the washer 3 are placed. The mechanism for rotating the pre-orientation and fixing the faceplate. The final fixation of the faceplate is carried out by a pair of toothed disks 5 and 6, and a preliminary

20 orientation — a pair of toothed disks 7 and 8, which are connected to the base 1 and the faceplate 3 and lie in the same plane. Gear wheels

The 7 and 8 mechanisms of the preliminary orientation have a triangular profile at the apex of the teeth, and the cavities are rectangular, with the width of the cavity larger than the width of the tooth. The turning mechanism consists of an electric igniter 9, which through a worm gear 10 is connected with the axis 2 of the faceplate 3 and simultaneously through a bevel gear 11 and a gearbox 12 with a cam 13 mounted on the output shaft of the gearbox 12. The cam 1Z contacts the roller of the limit switch 14. The control of the position of the faceplate 3 when the hydraulic cylinder is turned on is carried out by the limit switch 15.

The operation of the device is as follows.

When the button is pressed on the control panel (not shown), the working fluid enters the rod area of the hydraulic cylinders k and goes up and unlocks the faceplate 3. As soon as the faceplate 3 rises to the required height, the limit switch 15 opens and the drive turns from the electric motor 9. Rotation from the electric motor 9 through the worm gear 10 is transferred to the faceplate 3 and at the same time through the bevel gear 11 and the gearbox 12 to the cam 13, the number of projections which determines the possible number of divisions when OTE. The cam 13 in the process of turning the faceplate 3 also makes one revolution. As soon as the protrusion of the cam 13 runs onto the roller of the limit switch, and the latter triggers. In this case, the electric motor 9 is switched off and the rotation of the faceplate 3 is stopped. The working fluid is supplied to the cavity of the hydraulic cylinders. The plate 3 starts to fall and the pre-orientation discs 7 and 8 come into contact. During the fixing process, two cases are possible.

The first: a preliminary. {1 body error of positioning the faceplate 3 is equal to zero. At the same time, disks 5 and 6, did not carry out the rotation of the faceplate 3, of the windows (it is fixed once.

Second: the pre-positioning error of the faceplate 3 is not zero and for the worst case a little less than half of the pitch L between the teeth of the disks 5 and 6

(or 1 between disks 7 and 8). In this case, the teeth of the disk 7 begin to slide along the side surfaces of the teeth of the disk 8. In this case, the faceplate 3 gradually lowers and rotates. During the reattachment, the initial positioning error of the faceplate 3 decreases to zero. The rotation of the faceplate takes place due to the fact that the screw to the rotational drive of the faceplate 3 can be displaced in supports in one direction or the other. and 8, allowing the teeth of the disks 5 and 6 to come into contact with the final fixation.

The final fixation takes place only along the teeth of the disks 5 and 6, while, since 1irin padin of the disks 7 and 8 are greater than the width of their teeth, the disks 7 and 8 go out of engagement and a guaranteed gap I is formed. This ensures that the position of the disks 5 and 6 is certain when fixing.

The pre-orientation disk geometry parameters 7 and 8: angle |) at the top, height h of teeth, radius Z of disk, pitch 1. teeth, width A of teeth and B of cavities are determined based on the value L of the required rotation on the final fixation disks, height h of teeth discs of final fixation, the radius R of these discs and the stroke N of the hydraulic cylinder rod when lifting the faceplate.

Claims (1)

Thus, the use of an additional pair of pre-locking serrated discs with a triangular profile teeth at the apex and cavities made rectangular, simplifies the design of the dividing device, since there is no need for two actuators and complex devices controlling the rotation and fixation of the faceplate. This ensures the reliability of fixation even in the presence of a significant initial positioning error of the faceplate. Due to the fact that shocks and friction resulting from the positioning error of the faceplate are perceived by the pre-orientation discs that do not affect the positioning accuracy, the durability of the discs of the final fixation and, consequently, the accuracy of the positioning of the division plate are maintained. devices. DETAILED DESCRIPTION OF THE INVENTION A separating device comprising a faceplate mounted on the base, a faceplate locking mechanism made in two flat gear disks, one of which is mounted on the faceplate, and the other on the backing, different fug. / in order to increase durability and accuracy, the device is equipped with a pre-orientation mechanism for the faceplate, made in the form of two flat gear disks mounted on the faceplate and base coaxially to the fixation mechanism discs, with the cavities of the pre-orientation mechanism discs being rectangular and the cavities and teeth of the pre-orientation mechanism are arranged with a guaranteed clearance. Information sources, . taken into account during the examination 1. USSR author's certificate No. 93336, cl. 23 Q 17/02, 1972.