JPS5858529B2 - hydrostatic support member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydrostatic support member held in a support ring with oil pockets with a web surface for raceways with a diameter of 2 m or more.

For example, when supporting something of this kind of size hydrostatically, which is a problem when installing an antenna, etc.
Due to difficult manufacturing techniques, it is not possible to achieve the same precision as precision support members for machine tools.

Supports of this type are known which have hydrostatic support members in which oil pockets are carried on support spheres.

However, considering that the supporting capacity in the axial direction must be 50 to 100 tons, the diameter of the sphere should be 100 to 150 tons.
m1 must be relatively large, so the construction height of this support is very large.

Another question is whether the restoring moment of the oil pocket will exceed the friction on the spherical surface if the oil pocket is tilted relative to the rotating ring as a result of elastic deformation or manufacturing errors.

In the production of hydrostatic support members known in the art, it is ensured that the bearing ring is prevented from coming into metallic contact with the web surface of the oil pocket when the pump pressure disappears or when the bearing ring undergoes an elastic deformation. It is impossible to do so.

If the forces transmitted by this are too large, the web surface of the oil pocket is destroyed, so that the oil pocket must be removed and replaced with a new one.

For this reason, the entire installation must be stopped during the replacement time.

The essence of the object underlying this invention is that the web surface of the oil pocket can maintain the support of the raceway even if an overload is applied from the outside when the pump pressure decreases or when the raceway to be supported is elastically deformed. The aim is to create a hydrostatic support member that does not make metallic contact with the hoop.

To achieve this objective, the invention proposes a hydrostatic support member as described below.

In other words, the pocket support body supports the oil pocket through a circular ring surface formed into a spherical surface, a space above the oil pocket, and a space below the oil pocket that is connected by a perforation, and has an oil flow hole in the center. The cylinder is releasably connected to a piston which is guided in the cylinder and is provided with a fine thread on its outer periphery, said cylinder being screwable into the support ring and closed by a flange.

The oil pocket is lightly pressed against the pocket support by means of a threaded bolt with a perforation, with an elastic intermediate piece interposed.

The pocket support has a restriction built into the oil through hole.

Conveniently, the fine thread has a lead of 1 myn.

The fine thread of the cylinder has 10 axial grooves spaced equally apart from each other, while the support ring has 10 axial grooves at a distance corresponding to 9/10 of the spacing between the two grooves.
By means of said fine thread, which is characterized by having several equally sized grooves, it is possible to very precisely adjust the height of the bearing ring in which the hydrostatic support element is to be supported.

By arranging the grooves facing each other, fine adjustment is achieved by relying on the action of the vernier.

According to a further feature, an elastic spring acting on the piston is accommodated in the cylinder.

An advantage of this embodiment of the hydrostatic support member according to the invention is that the individual support members can be installed and removed during operation of the device.

Furthermore, the overall height of the support is relatively small.

In addition, the installation of pressure measuring devices eliminates repeated mechanical measurements, provides continuous control of the pressure, and eliminates uneven loads (Setzerscheinung).
) are immediately balanced each time.

The invention will be explained in more detail below with reference to the figures showing one embodiment.

A support ring 20 is stationary on the connection structure 10 .

This support ring 20 accommodates individual support members by screwing them into the support ring 20 as a unit.

Each support member is composed of the following main members.

namely, the oil pocket 30, the pocket support 40, the threaded bolt 50, the piston 60, the cylinder 70, the flange 80 and the orifice 90.

Cylinder 70 with a fine thread 71, especially one lead
is screwed into the support ring 20.

The peripheral edge of the fine thread T1 has 10 threads spaced at the same distance from each other.
grooves 72 are cut in the axial direction.

Two grooves 72 in easy-to-reach locations on the outer periphery of the cylinder
Ten grooves 21 of the same size as above are arranged along the support ring 20 at a distance corresponding to 9/10 of the spacing between.

In this way, the entire supporting member is assembled into one bearing ring with an accuracy of 1/100.
00.

Mechanical measurements can be omitted by installing a pressure measuring device (not shown) in the space 41 formed by the oil pocket 30 and the pocket support 40.

This support member must be supplied with oil if the height is to be adjusted.

When the desired oil pocket pressure is reached, the locking section 110 locks the oil pocket.

It is preferable to recheck the pressure in these supports within a short time after use in order to average out any uneven loading that may occur.

Since oil is forced into the cylinder internal space 73 through an oil supply hole 81 provided at the center of the flange 80, the piston 60 is pushed upward by a force proportional to its diameter.

This force corresponds to the maximum allowable oil pocket load applied from the outside.

As this oil pocket load increases, constant pump pressure is no longer sufficient to support the piston 60 against the upper stop bar 74.

Since the oil pockets 30 are retracted, metallic contact between the web surface 31 and the surface of the raceway 100 in the event of overload is avoided.

In such a special case, the bearing ring 100 is
It is supported by a support ring 20 on the outside of.

If the pump (not shown) stops, oil pocket 3
0 similarly falls.

In that case, the compression spring 120 incorporated in the cylinder 70
must overcome the friction between the piston 60 and the piston seal 61.

The oil coming out from the cylinder internal space 73 is transferred to the piston 60.
Through the oil through hole 62 provided in the center and the throttle 90 integrated in the pocket support 40, it enters the spaces 33, 41 on both sides of the oil pocket 30, connected by the hole 32.

The throttle 90 reduces the oil pressure in the oil pocket in proportion to its throttle index, from which pressure the diameter of the oil pocket is determined.

The oil located in the space 41 below the oil pocket 30 and receiving the oil pressure of the oil pocket is subjected to a force acting on the oil through hole 30 from the outside, which is applied to the circular ring surface 42 formed into a spherical surface. Its role is to reduce the friction so that only a small surface pressure and therefore a small amount of friction are applied.

Advantageously, the diameter of the space 41 below the oil pocket 30 is equal to or smaller than the diameter of the space 33 above the oil pocket 30.

At the start of work, a gap 1 is created on the web surface 31 of the oil pocket 30 at a location that is not on the circular ring surface 42 formed as a spherical surface.
30 is formed, the oil pocket 30 is pressed lightly against the pocket support 40 by means of a threaded bolt 50 via an elastic intermediate ring 51.

Therefore, this structure can also be used as a holding and supporting member.

Due to the hydrostatic reduction of the load on the spherically formed circular ring surface 42 and the slight friction, the oil pocket 30 always automatically assumes an adapted position with respect to the raceway ring 100.

If the bearing ring 100 is tilted relative to the oil pocket 30, an adjustment moment occurs as a result of the pressure change occurring inside the gap 130 of the circular ring-shaped web surface 31, which is expanded or contracted by the tilt. The parallel relationship between the surface 31 and the raceway 100 as well as the full support force are maintained.

[Brief explanation of the drawing]

FIG. 1 shows a cross-section of the hydrostatic support member, and FIG. 2 shows a cross-section of the cooperation of the support ring and the groove of the cylinder. Reference numerals in the figure, 20... Support ring, 30... Oil pocket, 40... Pocket support body, 42... Circular ring surface formed on a spherical surface, 60... Piston, 62...
...Oil flow hole, 70...Cylinder 71...
Fine thread, 80...Flange.

Claims (1)

[Claims] For bearing rings with a diameter of 12 m or more, a hydrostatic support member with a web-faced oil pocket and held in a support ring with a spherically shaped circular ring surface 42 and oil A pocket support body 4 that supports the oil pocket 30 via a space 41 below the oil pocket that is connected to a space above the pocket by a perforation.
A piston 60 is guided into a cylinder 70 which has an oil flow hole 62 in the center and into which pump pressure is introduced.
A fine thread 71 is provided on the outer periphery.
A support member characterized in that a cylinder 70 having a diameter can be screwed into the support ring 20 and is closed by a flange 80.