SU1228938A1 - Test bed for straightening blades - Google Patents

Description

one

The invention relates to shipbuilding, ship repair and mechanical engineering and can be used to edit blades in the manufacture and repair of blade products, such as ship propellers, propellers, impellers of hydroturbines, pumps, etc.

The purpose of the invention is to increase the productivity and accuracy of editing, as well as to reduce the metal consumption and labor intensity of production.

FIG. 1 shows the stand, longitudinal section; in fig. 2 shows a section A-A in FIG. in fig. 3 - rotated right device, side view; in fig. 4 - a set of interchangeable rods; in fig. 5 - bed, top view; in fig. 6 - installation of a separate blade on the false ledge.

The stand consists of a frame; at one end of which a heating device 2 is installed, on the other ring body 3, and between them a drive carriage 4 with a separating table 5, a mandrel 6 and a replaceable sleeve 7 for centering the propeller 8 and a nut 9 for fastening it. The carriage is driven from the electric motor 10 through the gearbox 11, the lead screw 12 and the nut 13. To turn the separator table 5, an electric motor 14 is provided,

Inside the annular body 3, a ring 15 is rotatably mounted comprising a bed 16 with a set of concentric circles arranged in arcs (FIG. 5) of replaceable rods 17-18 and a pressure device 19 in the form of cylinders with plungers 20. The upper rounded ends of the replaceable rods display a mirror-like pressure the side of the blade (figure 4). Each replaceable rod consists of two: the top 17 of a constant length h with a rounded end and the bottom 18 variable d, pins h; defined by the formulas

B; H i l. X. sin.Vj,

K is the length of the lower rod in axial lo-ty;

. I. is the distance from the axis - cosV. howling blades along an arc of radius of section G; ;

- distance from the axial blade over the section.

tgM., - (2)

where 4j is the stepping angle

radius.gi; H. - step section of the radius g.

The plus sign is applied to the rods located along the axial blade to the incoming edge, and the minus sign to the outgoing edge.

After substitution we get

h; H i 1 b „.

+ Sa. - 21f-r.

(3)

In order to simplify the shape of the case and reduce the length of the interchangeable rods, the bed 16 with the ring 15 is rotated in a plane across the axis of the blade by a stepping angle Q of the middle section of the deformed section (Fig. 2), therefore for this section the length of all lower rods is the same and h for the remaining sections will be

h. h + L.

1 0-1

sin (vp.-e) (4)

It is advisable to have a set of bed bodies dp diameters of propellers: small to 2 m, medium 2-4 m, large 4-6 m, especially large over 6 m.

The annular body 3 has two horizontal pins 2 inserted into the bores of the heads of two vertical posts 22 and allowing the correct device to be rotated in a plane along the axis of the blade. With the help of two worm gears 23 and 24 and a rectangular thread, the posts 22 can move the correct device along the axis of the propeller.

, fixing the angle of rotation 6 of the ring 15 in the ring case 3 are bolts 25, and for fixing the angle of rotation Y of the entire correct device - the bolts 26 and two sectors welded to the ring case two sectors 27. For reading the angle Q serves ppsal 28 on the case 3, and for y-angle - scale 29 On sector 27. Vertical racks

22 are guided by supports 30 on which bearings 3 of roller 32 with screws 23 are mounted for lifting racks with an annular body 3.

The bench is equipped with two pumps (not shown): low pressure, but high performance (for quick movements of pressure plungers), and high pressure, but low productivity (to create large straightening forces). From the distributor (not shown), the oil is supplied by the hoses 33 to the cylinders of the pressure plungers.

For straightening the individual blades (Fig. 6), a multifaceted false head 34 mounted on the mandrel 6 is provided, on the verge of which a separate blade 36 to be edited is centered and fixed with the help of the intermediate flange 35, and the opposite load is provided on the opposite edge for balancing 38

For reference radius when installing the carriage 4 on the frame 1 provides a scale of 39.

The stand works as follows.

The propeller 8 to be straightened is mounted and fixed on the mandrel 6, and the required set of interchangeable rods 17-18 are inserted into the holes in the bed 16. The ring 15 is rotated on a scale of 28 by an angle of 9 and fixed in the housing 3 by bolts 25. If the blade forming has a slope of f

2289384

then, loosening the bolts 26, turn the body 3 on a scale of 29 to this angle and the clamp bolts 26. If there is no inclination, the body 3 is set on a scale of 5 29 to zero.

If the deformations of the blades are small, the straightening is carried out without heating, and with large deformations the blade is heated, for which the carriage 4 is moved by means of the 10 10 electric motor, the blade 4 is moved, the blade is brought into the heating device 2, and the propeller is turned with the help of the electric motor 14 after heating 8 and. The 15-bladed v1 blade falls to the bed, setting the carriage 4 on a scale of 39 to the required radius.

By turning on the low pressure pump, the plungers are quickly brought to the blade, and then, using a high pressure pump, the deformed parts of the blade are straightened to fit completely to all the bed bars. To avoid indentation, steel gaskets (not shown) are used on the rods and under the plunsler.

Due to the rotation of the ring, the deformed section of the blade is located almost perpendicularly to the rods and plungers, so that tangential forces pushing the blade out do not occur.

Similarly, the remaining deformed blades of the BHHTii rowing blade are straightened.

f1 / g.

tf

ha

Fig 3

f Axis blade

ShchA output is loud

fig a

Entrance schola Kronka

5

Compiled by I. Aynetdinov Editor A. Kozoriz Tehred I., Popovich

Order 2334/8 Draw 783 Subscription

VNIIPI USSR State Committee

for inventions and discoveries - 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Proofreader L.Tatay

Claims (2)

1. A STAND FOR EDGEING BLADES of predominantly propellers, comprising a heating device located on the bed, a frame with the correct device in the form of vertically arranged cylinders with plungers, a bed for accommodating the discharge part of the blade, mounted with the possibility of moving the carriage with a dividing table and vertically in a horizontal plane located mandrel for centering and fixing the propeller or single blade, and a vertical adjustment mechanism for adjusting the relative position I have a propeller and a frame with a straightening device, characterized in that, in order to increase the accuracy and productivity of dressing, reduce the metal consumption and laboriousness of manufacture, it is equipped with an annular body mounted on the bed with the possibility of rotation, the longitudinal axis of which is located in a vertical plane passing through the axis of the mandrel, the frame of the correct device is made in the form of a ring concentrically placed with the possibility of rotation inside the annular body. <o 2. A stand according to claim. ^ Characterized in that the bed is made in the form of a flat casing with vertical holes, the axes of which are located on arcs of concentric circles relative to the axis of the mandrel, and removable rods of adjustable lengths located in these holes. SU, „1228938