RU2299116C2 - Indexing table positioning apparatus - Google Patents

Abstract

FIELD: machine engineering, namely automobile manufacture, for example assembling and welding panel of automobile floor.

SUBSTANCE: platform is mounted with possibility of rotation around vertical axis of bearing assembly and it includes upper and lower flanges rigidly joined one to other by means of cylindrical member. Rotation drive unit is provided with reduction gear mounted on support. Electric motor is mounted in upper flange of platform; its shaft is joined with inlet shaft of reduction gear whose outlet shaft is rigidly joined with platform. Bearing assembly is arranged between support and outlet shaft of reduction gear. Apparatus is provided with member for fixing position of platform; said member is in the form of pin driven by means of pneumatic cylinder. Fixing member is mounted in strut with possibility of cyclic engagement with positioning holes formed in lower flange of platform.

EFFECT: improved accuracy of positioning indexing table, enhanced efficiency of assembling and welding.

1 dwg

Description

The invention relates to the field of engineering, in particular to the automotive industry, and may find application, for example, in the assembly and welding of a car floor panel.

A technical solution is known as a “dividing-rotary table” (US 5862718, IPC 7 V23B 29/24), comprising a mounting plate on which a base plate is mounted, a device for pivotally hanging the base plate over the base on an air cushion, a mechanism for turning the base plate into a predetermined angular position. Also, the rotary table contains a mechanism that closes the base plate in a predetermined position, a base associated with the base plate, located on the opposite side relative to the mounting plate, a casing in which the device for pneumatic suspension of the base plate is mounted. On the basis of the installed ball valve of compressed air supply associated with the suspension device, the rotation mechanism of the base plate and with the mechanism that closes the base plate.

This technical solution does not have sufficient speed characteristics and carrying capacity due to the use of pneumatic suspension of the base plate.

Also known is the "Rotation Drive" (JP 6088187, IPC 7 B23Q 1/02), which contains a base, a first ring mounted on the base using the first bearing with the possibility of rotation relative to the base. The second ring is mounted coaxially with the first ring with the possibility of rotation using the second bearing relative to the first ring.

The drive also includes a clamping device mounted on the base and securing the first ring relative to the base, a clamping device mounted on the base and securing the second ring relative to the base. The actuating unit (piezoelectric element) provides microdisplacement of the first and second rings around the circumference of one relative to the other.

The known rotation drive has the following disadvantage: the actuating unit cannot provide significant movement with sufficient speed.

Closest to the technical nature of the proposed technical solution is a "Machine with a rotary table for the manufacture of parts or assemblies" (US 5950503 A, IPC 7 V23Q 16/02), containing a rotary table having an open Central part, rotating around a vertical axis. Around the circumference of the table are the positions for processing, feeding and removing parts. A support is fixed in the central part of the table, on which a platform is mounted, rotating on bearings mounted between the support and the table. A drive hub is fixed to the platform, which is connected with a drive belt to a pulley fixed to the end of the motor shaft. Using a system of pulleys and drive belts, the rotation of the electric motor is transmitted to the rotary table.

However, the known machine has the following disadvantages: inaccurate positioning of the table, insufficient load capacity due to possible slippage of the drive belt.

The creation of this device for positioning a turntable is aimed at improving productivity and positioning accuracy. For this, a device for positioning a rotary table, comprising a support on which a platform is mounted rotatably around the vertical axis of the support, a bearing and a rotation drive with an electric motor, is equipped with a platform position lock, and the rotation drive is equipped with a gearbox. The platform includes upper and lower flanges, rigidly interconnected by a cylindrical element. The gearbox is mounted on a support, the electric motor is mounted on the upper flange of the platform, and its shaft is connected to the input shaft of the gearbox, the output shaft of which is rigidly connected to the platform. The bearing is located between the support and the output shaft of the gearbox. The platform position lock is made in the form of a finger, driven by a pneumatic cylinder, and mounted on a rack with the possibility of periodic interaction with positioning holes made on the lower flange of the platform.

The drawing shows a General view of the device.

A device for positioning a rotary table comprises a support 1. On a support 1, a platform 2 is installed, consisting of an upper 3 and a lower 4 flanges rigidly connected to each other by a cylindrical element 5, rotating around the vertical axis of the support 1. Fasteners for fixing are located on the upper flange 3, for example, a turntable (not shown in the drawing). The rotation drive 6 with the electric motor 7 is equipped with a gear 8. The electric motor 7 is mounted on the upper flange 3. To ensure rotation in two directions, the electric motor 7 is reversible. The gearbox 8, which serves to change the speed of rotation, is mounted on the support 1. The output shaft 9 of the gearbox 8 is rigidly connected to the platform 2, and the input shaft 10 is connected to the shaft of the electric motor 7. The bearing 11 rotates the platform 2 relative to the support 1 and is located between the output shaft 9 gearbox 8 and support 1. As a bearing, a rolling bearing with crosswise arranged rollers can be used to transfer the load in two planes. The position lock 12 serves to lock the platform 2 in the desired position in order to ensure positioning accuracy and operator safety. The position lock 12 is made in the form of a finger 13, driven by a pneumatic cylinder 14 connected to a device for supplying compressed air (not shown in the drawing), and mounted on a stand 15 with the possibility of periodic interaction with positioning holes 16 made in the lower flange 4 of the platform 2 The number and location of holes is determined by the number and relative orientation of the required positions of the platform 2 in accordance with the technological process.

The device operates as follows.

In the initial position, the platform 2 is locked with a position lock 12, that is, the pin 13 is located in the positioning hole 16 in the lower flange 4. According to the technological process, the necessary operations are carried out, for example, loading. Then, the position lock 12 releases the platform 2, i.e. the finger 13 leaves the positioning hole 16 in the lower flange 4 under the action of a pneumatic cylinder 14 connected to a device for supplying compressed air (not shown in the drawing), and power is supplied to the electric motor 7. The rotation of the shaft of the electric motor 7 through the gearbox 8 is converted into the rotational movement of the output shaft 9 last. But since the output shaft 9 of the gearbox 8 is rigidly connected to the platform 2, the platform 2 rotates, with which the rotary table rotates at an angle specified by the technological process, and the speed of this rotation is determined by the gear ratio of the gearbox 8. After the platform 2 stops, the position lock 12 stops it, that is, the finger 13 enters the positioning hole 16 in the lower flange 4 under the action of the pneumatic cylinder 14. After one or more cycles, depending on the technological process, the platform 2 by time scheniya in the opposite direction due to the reversal of the motor 7 is returned to its original position. Next, the cycle repeats.

Claims (1)

A device for positioning a rotary table, comprising a support on which a platform is mounted rotatably around the vertical axis of the support, a bearing and a rotation drive with an electric motor, characterized in that the platform includes upper and lower flanges rigidly connected to each other by a cylindrical element, the rotation drive is equipped with a gear mounted on a support, the electric motor is mounted on the upper flange of the platform, and its shaft is connected to the input shaft of the gearbox, the output shaft of which is rigidly connected to the platform And a bearing disposed between the support and the output shaft of the gearbox, wherein the device is provided with a platform locking position, configured as a finger-driven air cylinder, and mounted on a rack to periodically interact with the positioning holes formed on the bottom flange of the platform.