RU2200075C2 - Mobile apparatus for turning ends of large-size shells - Google Patents

Abstract

FIELD: machine engineering, machine tool manufacture, namely machine tools of lathe group, for example for turning sealing surfaces, particularly of bodies of wedge dampers at restoring them. SUBSTANCE: apparatus includes drive motor for providing main motion and automatic cross feed of cutter, manual drive for cross feed of cutter, cutter holder with manual screw drive of cutter in-feed; tubular body with members for mounting it relative to worked surface; jack- carriage. Drive mechanism for providing main motion is in the form of first and second successively joined planetary stages mounted on common stationary axle joined with mechanism for adjusting working angle. First planetary stage includes stationary carrier on which above mentioned drive motor is mounted. Shaft of drive motor supports sun gear. Second planetary stage is in the form of differential mechanism whose central gear wheels have on opposite ends coaxial toothed rims for engaging with satellites of first planetary stage. On axle of one of satellites of second planetary stage set of gear wheels is mounted and it is kinematically joined with screw mechanism of rest for automatic cross feed of cutter. On outer generatrix of tubular body radial extensible supports are uniformly mounted along circle; said supports are arranged by two rows, three supports in each row. Supports of one row are in the form of double-arm hinge mechanisms whose one ends are joined with tubular body and whose other ends are joined with slider. The last by means of radial pins arranged in lengthwise grooves of tubular body is joined with rigid disc secured to rod of power cylinder having screw for manual drive of piston. Said screw is jointly connected with piston and it is mounted in threaded opening of cylinder cover. EFFECT: simplified design of easy-to-use apparatus, improved accuracy of working due to system for accurate tuning and basing relative to worked surface. 3 dwg

Description

 The invention relates to mechanical engineering, to machine tool industry, to machine tools of the turning group, and is intended for the machining of sealing surfaces, mainly wedge gate valve bodies during their repair.

 Known portable machine for boring cylinders of piston mechanisms (MN Krynitsa. Mechanization of fitting and assembly work on ships. L .: Sudostroenie, 1976, S. 258-260). The machine contains a hollow boring bar mounted in spaced bearings with the possibility of rotation. A double-cutter head is installed on the boring bar with the possibility of forced axial movement under the action of the spindle and feed mechanism. The rotation drive of the boring bar is carried out from the electric motor through a V-belt drive and a worm gear. The presence of interchangeable V-belt pulleys provides six steps of frequency of rotation of the boring bar.

 The disadvantage of a portable machine is the high error of its base, the impossibility of processing the casing from one installation, the impossibility of ensuring the necessary correspondence of the angular parameters of the locking elements and sealing surfaces in the wedge gate valve bodies.

 Known portable machine for machining (RF patent 2144449, IPC 23 V 41/00, publ. 01/20/2000), containing a drive motor, a drive for the main movement of the cutter, a drive for automatic feed of the cutter, a tool holder with a manual screw drive for transverse feed and cutting tool, tool holder with manual screw drive for lateral feed and cutting tool, case with elements of basing, centering and mounting. The kinematic diagram of the machine provides a combination of the main movement and the feed of the cutter in one drive.

 A disadvantage of the known portable machine tool for machining is the design complexity, inconvenience in operation and insufficient processing accuracy due to the low rigidity of the structure.

 The proposed invention is aimed at simplifying the design, improving ease of use and improving the accuracy of processing by creating an effective base system and adjusting the machine relative to the machined surface.

 The task is achieved by a mobile turning device for processing the ends of large-sized shells containing a drive motor that provides the main movement of the cutter and automatic transverse feed of the cutter, manual drive of the transverse feed of the cutter, a tool holder with a manual screw drive for cutting the cutter, a housing with fastening elements relative to the surface to be machined, in which unlike the prototype, the drive of the main movement is made in the form of the first and second sequentially connected planetary stages along 2K-N mounted on a common fixed axis, fastened with a mechanism for adjusting the angle of treatment, the first planetary stage equipped with a stationary carrier, on which the drive motor is mounted, the sun gear is fixed on its shaft, and the second planetary stage is made in the form of a differential, central gears which from opposite ends are equipped with coaxial gear rims coupled to the satellites of the first stage, while on the axis of one of the satellites of the second stage a gear block is fixed, kinematic eski connected to the screw mechanism of the support of the automatic transverse feed of the cutter, and on the outer generatrix of the tubular body there are radial sliding supports equally spaced around the circle, grouped in two rows of three supports in each, and the supports of one of the rows are made in the form of double-lever hinge mechanisms, one ends of which connected to the tubular body, and others with a slider sliding along it, which is connected with the help of radial fingers located in the longitudinal grooves of the tubular body disc bonded to the rod of the actuator, which is provided with a manual drive spindle piston pivotally secured to the piston and disposed in the thread on the cylinder cover.

 The drawings illustrate an example implementation of the invention - a mobile turning device for processing the ends of large shells, figure 1 is a kinematic diagram of the device, figure 2 is a General view of the device installed in the valve body, figure 3 - design of the power cylinder.

 The device (see Fig. 1 and Fig. 2) contains a cross-beam 1, mounted on a fixed axis 2. At the end of the cross-beam there is a support 3 for automatic transverse feed and a tool holder 4 with a manual screw drive for cutting the tool. The rotation of the traverse (the main movement) and the automatic transverse feed of the caliper are provided by a drive motor 5 fixed relative to the fixed axis 2, on which is also fixed a mechanism for adjusting the angle of processing, containing adjusting nuts 6, pivot links 7 and 8, respectively connected to the fixed axis 2 and tubular case 9.

 On the outer generatrix of the tubular casing, radial sliding supports 10 and 11 are equally spaced around the circumference, providing a rigid fastening of the device inside the machined shell 12.

 The opposite end of the tubular body is fastened with a power pneumatic cylinder 13 kinematically connected with radial sliding supports 10. The power cylinder (Fig. 3) is equipped with a screw 14 pivotally connected to the piston 15 and placed in the thread on the cover 16 of the pneumatic cylinder.

 The steering wheel 17 and the locking handle 18 are mounted on the screw 14. Air is supplied to the pneumatic cylinder through the fitting 19.

 To move along the machined shell and to adjust the position of the axis of rotation of the traverse in height, the device has a carriage jack 20, mounted on a tubular body 9.

 To manually return the caliper 3 to its original position, the mobile turning device has a removable handle 21.

 To set the insertion depth, the turning device has a head 22 with a reference dial.

 To set the feed rate S mm / rev, the device has a button 23 located under the removable handle 21.

The drive motor 5 is mounted on a stationary carrier 24 (see FIG. 1) of the first planetary stage made according to the 2K-N scheme. The fixed carrier is fastened to axis 2. A sun gear 25 (Z ₁ ) is mounted on the motor shaft, coupled to satellites 26 (Z ₂ ). Hereinafter, Z _i is the number of teeth.

The second planetary stage, made in the form of a differential according to the 2K-N scheme, is mounted in traverse 1 and consists of central wheels 27 (Z _a ) and 28 (Z _c ), coupled to satellites 29 (Z _d ). The central wheels 27 and 28 from opposite ends are equipped with coaxial gear rims 30 (Z ₃ ) and 31 (Z ₄ ), coupled to the satellites 26 of the first planetary stage.

On the axis of one of the satellites 29 of the second planetary stage, a block of gears 32 (Z ₅ ) and 33 (Z ₇ ) is fixed, coupled to gears 34 (Z ₆ ) and 35 (Z ₈ ), which transmit rotation to the shaft 36 by means of a dowel 37. On the end of the shaft 36 is fixed bevel gear 38 (Z ₉ ), coupled with a bevel gear 39 (Z ₁₀ ), interacting with the spindle 40, which is connected through a friction clutch 41 to the caliper 3 automatic feed cutter.

 The sliding supports 10 (see Fig. 2) are made in the form of double-lever hinge mechanisms, the ends of which are pivotally connected respectively to the tubular body 9 and with a slide 42 sliding along it, which is connected with the radial fingers 43 located in the longitudinal grooves 44 of the tubular body with a hard disk 45 fastened to a piston rod stock 46 (see FIG. 3).

 Sliding bearings 11 have a radial stroke along the thread, which is regulated by nuts 47.

 The operation of the device is as follows.

 A mobile turning device on a jack carriage 20 is rolled inside the machined shell 12 and secured by means of sliding supports 10 and 11.

 In this case, the supports 10 are moved apart by means of a steering wheel 17 mounted on a screw 14 (preliminary fastening) with subsequent supply of air pressure to the pneumatic cylinder 13 through the fitting 19 (final fastening). The clamping force achieved on the supports 10 is fixed by the booster of the spindle 14 with its subsequent locking from a turn by the locking handle 18.

 The fastening of the mobile turning device by means of sliding supports 11 is carried out by rotating the nuts 47.

где n_дв - частота вращения приводного двигателя, об/мин.When you turn on the drive motor 5, the beam 1 with the cutter makes the main movement with a speed of n _tr . In this case, the equation of the main motion chain has the form

where n _dv is the rotational speed of the drive motor, rpm

 Through the gear system, as shown in the drawings, the caliper with the cutter receives an automatic feed.

где t_xв - шаг ходового винта 40 в мм.The equation of the feed chain, depending on the position of the exhaust key 37 is

where t _xв - _lead screw pitch 40 in mm.

 The adjustment of the processing angle is carried out by means of adjusting nuts 6 of the hinged links 7 and 8.

 Thus, the proposed mobile turning device due to the presence of a rigid system of basing and centering relative to the machined surface, together with the simplicity of design provides ease of use and high quality processing.

Claims (1)

 A mobile turning device for processing the ends of large-sized shells, characterized in that it comprises a drive motor for providing the main movement and automatic transverse feed of the cutter, a manual drive of the transverse feed of the cutter, a tool holder with a manual screw drive for cutting the cutter, a tubular housing with fastening elements relative to the work surface and carriage-jack, the drive of the main movement is made in the form of the first and second series-connected planetary stages according to the scheme 2K-N, mounted on a common fixed axis, fastened with a mechanism for adjusting the angle of treatment, the first planetary stage contains a stationary carrier, on which the said drive motor is mounted, on the shaft of which the sun gear is fixed, and the second planetary stage is made in the form of a differential, the central gears of which are from opposite ends have coaxial gear rims designed for engagement with the satellites of the first planetary stage, while on the axis of one of the satellites of the second planetary stage fixed a gear block kinematically connected with a screw mechanism for a support of automatic transverse feed of a cutter, radial sliding bearings equally spaced around the circumference are arranged on the outer generatrix of the tubular body, grouped in two rows of three supports each, and the supports of one of the rows are made in the form of double-lever hinge mechanisms, some ends of which are connected to the tubular body, and others - with a slider sliding along it, which by means of radial fingers located in the longitudinal grooves of the tubular housing, connected to a hard disk attached to the rod of the power cylinder, having a screw for manual piston drive, which is pivotally attached to the piston and placed in the thread on the cylinder cover.

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