KR101326404B1 - The strength testing equipment for sterntube bearing - Google Patents

Abstract

The present invention relates to a durability test device for a stern tube and is to test the durability of a stern tube, which separates the inside and the outside of a ship in a watertight manner while allowing the axis connected to the propeller of the ship to rotate smoothly, in conditions as similar to the actual navigation conditions as possible. The durability test device for a stern tube includes a main water tank which has a rectangular-shaped top side, a mounting hole on the front side, an observation window on one lateral side, and a first drain pipe including a first valve to discharge foreign substances settled inside at the bottom and is filled with sea water; a secondary water tank which is placed at the rear of the main water tank, includes a second drain pipe including a second valve to discharge foreign substances settled inside at the bottom, and is filled with sea water; a VS motor of which the rotational speed changes depending on the current supply amount; a bearing housing which includes a bearing mounting hole on the extended line from the center of the mounting hole at the rear, into which a stern tube bearing in a circular shape is mounted, and which is placed inside the main water tank; a support bar which is fixed onto the bottom of the main water tank and onto the top of which the bearing housing is fixed; and a power generation and transmission device which comprises an axis being linked to the VS motor, penetrating the mounting hole, being inserted into the stern tube bearing, and being extended toward the rear and a load nut having a circular plate shape. Into the load nut, the rear of the axis is inserted and fixed.

Description

Strength testing equipment for sterntube bearing

The present invention relates to an apparatus for testing the durability of a stern tube bearing, and in more detail, when the shaft connected to the propeller of a ship rotates smoothly while actually navigating the durability of the stern tube bearing to isolate and waterproof the inside and the outside of the ship. This invention relates to the durability test apparatus for stern tube bearings developed to be tested in the closest possible conditions.

In general, a ship has a structure that rotates the shaft through a clutch or transmission gear to transmit power to the shaft when the engine generates power, the propeller mounted at the end of the shaft is moved by the structure to push the water to the rear.

Water and propellers are forced in opposite directions. The propeller's force is transmitted to the shaft and to the bearings that allow the shaft to rotate smoothly. It is called bearing or stern tube bearing.

The stern tube bearing must have watertightness to prevent the water from invading by the external water pressure while the shaft rotates smoothly, and the compression force and the rotational force pushed backward by the shaft act as a normal force in the rotational center. It must be durable enough.

At this time, the biggest difference between a yacht and a small- and medium-sized vessel is high speed and low speed operation, and a yacht can achieve high speed through high speed rotation of a propeller, whereas a small and medium vessel (fish boat) is slower than a yacht through a medium / low speed rotation. B. The weight of the ship itself and the weight of sealing equipment and cargo are heavy, but the engine torque is heavy.

According to these various types of ships, stern tube bearings are designed and mounted to meet their requirements, but there is no equipment to effectively test whether they have sufficient durability before they are mounted on the ship.

In addition, if the shaft is too long, the vibration occurs in the normal direction as it rotates, causing damage to the ship.Therefore, the bearings for fixing it are arranged and fixed at regular intervals, but considering the intermediate fixing bearing, the durability of the stern tube bearing can be tested. There is also a need for a device that can.

(Patent Document 1) Republic of Korea Patent Publication No. 10-2009-0079872 (July 22, 2009) (Patent Document 2) Republic of Korea Patent Publication No. 10-2006-0034809 (April 26, 2006) (Patent Document 3) Korean Patent Registration No. 10-0243927-0000 (November 19, 1999)

The present invention has been developed to solve the above problems, the object of the present invention is to test the durability of the stern tube bearing sturdy tube bearing durability test device in the conditions as close as possible when the actual high speed or low speed vessel operating It's about developing.

In order to achieve the above object, the present invention has a shape of a rectangular parallelepiped with an open top surface, a mounting hole formed through the front surface, a transparent observation window formed on one side, and a foreign substance deposited inside the lower end to discharge the foreign matter. A main water tank including a first drain pipe having a first valve and filled with seawater;

An auxiliary water tank disposed in the rear of the main water tank and including a second drain pipe having a second valve to discharge the foreign matter precipitated therein and adjoining a lower end thereof, wherein the auxiliary water tank is filled with sea water;

A VS motor having a rotational speed varying with a current supply amount, a bearing housing having a cylindrical stern tube bearing equipped with a bearing mounting hole extending along the rear center of the mounting hole and positioned inside the main tank, and a lower end of the main tank bottom. A support shaft fixed to the support housing to which the bearing housing is fixedly mounted, a shaft interlocking with the VS motor and penetrating the mounting hole, and inserted into the stern tube bearing and extending rearward, and formed in a disc shape to the rear of the shaft. It is composed of a power generating and transmitting device composed of a load nut which is inserted and fixed.

And, one end is connected to the rear upper end of the main tank and the other side is horizontally extended to the rear and the vertical pipe bent vertically at the top of the auxiliary tank, one side is connected through the lower portion of the auxiliary tank and the other side is the stern tube A supply pipe branched to at least one position forward of the bearing mounting position to supply seawater, a pump mounted in the middle of the supply pipe, and two or more control valves mounted at the supply pipes in front and rear of the pump. It is characterized by consisting of a sea water circulation device made.

In addition, the rear surface of the main tank has a diameter larger than the diameter of the load nut, the inner diameter surface is extended to the rear and the rear end is a first mounting rib extending in the normal direction, radially spaced along the first mounting rib Further forming an entrance hole having a plurality of first bolt holes formed therein;

An entrance hole cover formed in a disc shape having a second bolt hole corresponding to the first bolt hole, fixed by a pair of bolts and nuts, and having a handle on a rear surface thereof;

It is characterized in that it further comprises a first gasket formed in the shape of a ring and having a third bolt hole corresponding to the first and second bolt holes inserted between the first mounting rib and the mounting hole cover.

In addition, the mounting hole has a diameter larger than the diameter of the shaft and the inner diameter surface is extended forward and the front end is a second mounting rib extending in the normal direction, a plurality of radially formed along the second mounting rib at a predetermined interval A fourth bolt hole;

A shaft insertion hole is formed at the center thereof and is inserted in correspondence with the diameter of the shaft. The shaft is inserted in the normal direction and then bent vertically forward, and the front end is formed with a third mounting rib extending in the normal direction, and along the third mounting rib. A packing box having a plurality of fifth bolt holes formed radially at regular intervals;

A second gasket having a ring shape and having a sixth bolt hole corresponding to the fourth and fifth bolt holes and inserted between the second mounting rib and the third mounting rib;

It has an inner diameter larger than the outer diameter of the shaft and an outer diameter smaller than the inner diameter of the third mounting ribs of the packing box, the front is extended in the normal direction to form a fourth mounting ribs, and radially spaced along the fourth mounting ribs Further comprising a fixed flange having a plurality of seventh bolt holes;

It is configured to be fixed by a pair of bolts and nuts that are fixed to the fourth to seven bolt holes while the fixing flange is pressed against the front of the gland packing member inserted into the space between the shaft and the front of the pating box. It features.

In addition, the end of the shaft is provided with a load nut insertion portion of which the outer diameter is narrowly reduced, and a fixing hole formed in the center direction from the outer diameter surface adjacent to the rear end;

The load nut is formed in a disc shape and has a coupling hole having an inner diameter corresponding to the load nut inserting portion at the center, and a pair of lifting holes formed at symmetrical positions in the center direction from the outer diameter surface to insert the load nut. At least one insert into the portion;

One side is characterized in that it further comprises a fixture having a fixing projection inserted corresponding to the fixing hole.

As described above, the present invention allows to test the durability of the stern tube bearing by rotating the shaft in the environment as close as possible to the actual ship operating conditions, such as various foreign matters and floating matters in the water tank, so as to detect design errors that may occur during actual installation operation. It has the effect of minimizing and making the design test of the stern tube bearings accurate and quick.

FIG. 1 is a conceptual diagram according to an embodiment of the present invention.
Figure 2 is an exploded perspective view showing a bearing housing according to an embodiment of the present invention
Figure 3 is a perspective view of the main water tank according to an embodiment of the present invention
4 is a partially exploded perspective view showing the entrance hole and the cover according to an embodiment of the present invention;
5 is a partial cross-sectional view showing a fixing structure by a packing box according to another embodiment of the present invention
6 is a cross-sectional view showing a structure of a load nut and a shaft corresponding thereto according to another embodiment of the present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a bearing housing according to an embodiment of the present invention, Figure 3 is a perspective view showing a main water tank according to an embodiment of the present invention The first valve has a shape of a rectangular parallelepiped with an open top surface, a mounting hole 11 formed through the front surface, a transparent observation window 12 formed at one side thereof, and a first valve for discharging foreign matter deposited inside the lower end. A main water tank 1 having a first drain pipe 13 having 131 and filled with seawater;

Located in the rear of the main tank (1) and adjacent to the lower end of the auxiliary tank (2) including a second drain pipe 21 having a second valve 211 to discharge the internally settled foreign matter (2) )Wow;

It is equipped with the VS motor 31 whose rotational speed changes according to the amount of current supplied, and the bearing mounting hole 321 which is on the rear center line extension line of the said mounting hole 11, and is equipped with the cylindrical stern tube bearing 4, and is equipped with the main tank ( 1) the bearing housing 32 is located inside, the lower end is fixed to the bottom of the main water tank (1), the support 33 to which the bearing housing 32 is fixedly mounted upwards, and the VS motor 31 and A load nut for interlocking and penetrating the mounting hole 11 and being inserted into the stern tube bearing 4 and extending rearward, and formed in a disc shape so that the rear of the shaft 34 is inserted and fixed. A power generation and transmission device 3 consisting of 35;

One side is connected to the rear upper end of the main water tank (1) and the other side is horizontally extended to the rear and the circulation pipe 51 vertically bent at the top of the auxiliary water tank (2), one side of the auxiliary water tank (2) A supply pipe 52 which is connected through a lower portion and is branched to at least one position forward of the position where the stern tube bearing 4 is mounted to supply seawater, and is mounted in the middle of the supply pipe 52. Durability test of the stern tube bearing, characterized in that consisting of a pump 53, and the seawater circulation device 5 consisting of two or more control valves 54 mounted to the supply pipe 52 of the front and rear of the pump 53 The device is shown.

The present application is to be applicable to the high speed but low torque vessel and the low speed but high torque vessel at the same time to allow the sea water to flow in the main tank (1) so that the actual vessel is most similar to the conditions operating in the sea, more effective For testing purposes, sand and other suspended matter at sea can be tested to obtain more accurate test results.

First, in the power generation and transmission device 3, the rotation speed of the motor shaft is adjusted according to the amount of current supplied using the VS motor 31. The low speed (500 to 1000 RPM) and the high speed (1500 to 2500 RPM) used in the ship are used. It is preferable to use the VS motor 31 which can rotate.

Various connection structures may be used as a method for transmitting the power of the VS motor 31 to the shaft 34, but the embodiment using the clutch 37 is illustrated in the drawing.

In addition, the rotating shaft of the actual running ship forwards the final force to the propeller to forward the ship, but in the present application to the load nut (35; load nut) to achieve the same performance as the propeller stern tube bearing (4) ) Was designed to achieve the surface pressure required by the KR, and naturally caused by the weight of the load nut (35) caused the eccentricity to accelerate the wear of the stern tube bearing (4).

At this time, the introduced foreign matter such as sand is configured so that the test can be carried out under adverse conditions that can further accelerate the wear of the stern tube bearing (4).

The present application artificially creates a realistic environment using seawater, and forms a transparent observation window 12 at the same position where the stern tube bearing 35 is installed so that the naked eye can be observed while the shaft 34 is rotating. It could be confirmed as.

In addition, the seawater temperature in the main and auxiliary tanks (1, 2) is kept constant by the seawater circulation system (5), and the water in the auxiliary tank (2) is supplied to the front of the main tank (1) to circulate the seawater. It was flowing from front to back in the same way as this ship.

Figure 4 is a partially exploded perspective view showing the entrance hole and the cover according to an embodiment of the present invention, the inner surface of the main tank (1) has a diameter larger than the diameter of the load nut (35) extending rearward And the rear end has an entrance hole 14 having a first mounting rib 141 extending in a normal direction and a plurality of first bolt holes 142 radially spaced along the first mounting rib 141. ) Is further formed;

It is formed in a disk shape having a second bolt hole 151 corresponding to the first bolt hole 142 and is fixed by a pair of bolts 61 and nuts 62 and provided with a handle 152 on the rear surface. An entry hole cover 15;

It is formed between the first mounting rib 141 and the mounting hole cover 15 having a third bolt hole 161 corresponding to the first and second bolt holes 142 and 151 having a ring shape. An embodiment is provided, which is further provided with a first gasket 16.

The above-mentioned load nut 35 is preferably replaced with a different weight according to the test conditions. In order to easily control the weight, the load nut 35 is provided with various weights such as in weightlifting to adjust the weight by mounting several from one. It is preferable to.

The embodiment allows the load nut 35 to be inserted and removed through the entry hole 14 for smooth replacement of the load nut 35 and has a watertight structure so that seawater does not leak during the test.

5 is a partial cross-sectional view showing a fixing structure by a packing box according to another embodiment of the present invention, the shaft 34 is connected to the inside from the outside of the main tank (1) so that the watertightness is not maintained by the gap In order to solve this problem, an embodiment using the same gland packing type sealing structure as that used in ships is shown. The simple sealing structure generates high heat due to friction during unlubrication. Land packing structure A method of lubricating small amounts of seawater by flowing.

An embodiment for achieving such a structure is the mounting hole 11 has a diameter larger than the diameter of the shaft 34 and the inner diameter surface is extended forward and the front end is the second mounting ribs 111 extending in the normal direction and And a plurality of fourth bolt holes 112 radially formed along the second mounting ribs 111 at regular intervals;

In the center, a shaft insertion hole 171 is formed to be inserted corresponding to the diameter of the shaft 34 and extends in the normal direction, and then vertically bent forward. The third mounting rib 172 extends in the normal direction. And a packing box having a plurality of fifth bolt holes 173 radially formed along the third mounting ribs 172 at regular intervals;

A sixth bolt hole 181 having a ring shape and corresponding to the fourth and fifth bolt holes 112 and 151 is inserted between the second mounting rib 111 and the third mounting rib 172. A second gasket 18;

Has an inner diameter larger than the outer diameter of the shaft 34 and an outer diameter smaller than the inner diameter of the third mounting rib 172 of the packing box 17, the front is extended in the normal direction to form a fourth mounting rib 191 And a fixed flange 19 having a plurality of seventh bolt holes 192 radially spaced along the fourth mounting ribs 191.

The fourth to seventh bolt holes 112, 173, 181, while the fixing flange presses the front of the gland packing member 341 inserted into the space between the shaft 34 from the front of the packing box 17. It is configured to be fixed by a pair of bolts 61 and the nut 62 is fixed to the 192.

6 is a cross-sectional view showing a structure of a load nut and a shaft corresponding thereto according to another embodiment of the present invention, the end of the shaft 34 is a load nut insertion portion 342 and the rear end of which the outer diameter is narrowly reduced; A fixing hole 343 formed in the center direction at the outer diameter surface adjacent to the upper surface;

The load nut 35 is formed in a disc shape and has a coupling hole 351 having an inner diameter corresponding to the load nut inserting portion 342 at the center thereof, and at least one pair formed at a symmetrical direction in the center direction from the outer diameter surface thereof. A lifting hole 352 is inserted into the load nut inserting section 342;

One side has shown an embodiment further comprising a fixture 36 having a fixing protrusion 361 is inserted corresponding to the fixing hole (343).

As described above, the load nut 35 has to be tested by applying various weights. For this purpose, it is preferable to adjust the weight by mounting several pieces from one by having various weights as in weightlifting. The fixture 36 is provided as a means for fixing the inserted load nut 35.

1: main tank
11: Mounting hole
111: second mounting rib 112: fourth bolt hole
12: observation window
13: first drain pipe
131: first valve
14: entrance hall
141: first mounting rib 142: first bolt hole
15: entrance hole cover
151: second bolt hole 152: handle
16: first gasket
161: third bolt hole
17: Packing Box
171: shaft insertion hole 172: third mounting rib
173: fifth bolt hole
18: second gasket
181: sixth bolt hole
19: fixed flange
191: 4th mounting rib 192: 7th bolt hole
2: auxiliary tank
21: second drain pipe
211: second valve
3: power generation and transmission device
31: VS motor
32: bearing housing
321: bearing mounting hole
33: support
34: axis
341: cland packing member 342: load nut insertion portion
343: fixing hole
35: load nut
351: coupling hole 352: lifting hole
36: Fixture
361: fixed protrusion
4: stern tube bearing
5: seawater circulator
51: circulation pipe 52: supply pipe
53 pump 54 control valve
61: Bolt
62: nut

Claims (5)

The upper surface has a shape of a rectangular parallelepiped, the mounting hole 11 formed through the front, the transparent observation window 12 formed on one side, and the first valve to discharge the foreign matter precipitated adjacent to the lower end ( A main water tank (1) having a first drain pipe (13) having 131 and filled with seawater;
Located in the rear of the main tank (1) and adjacent to the lower end of the auxiliary tank (2) including a second drain pipe 21 having a second valve 211 to discharge the internally settled foreign matter (2) )Wow;
The cylindrical motor is equipped with the VS motor 31 whose rotational speed changes according to the amount of current supplied, and the bearing mounting hole 321 on the same center extension line of the rear side of the mounting hole 11. (1) a bearing housing 32 located inside, a lower end of which is fixed to a bottom of the main water tank 1, and a support 33 on which the bearing housing 32 is fixedly mounted upward, and the VS motor 31 And a shaft 34 which is inserted into the stern tube bearing 4 and extends rearward after being interlocked with the mounting hole 11 and is formed in a disc shape so that the rear of the shaft 34 is inserted and fixed. Durability testing apparatus for stern tube bearings consisting of a power generating and transmitting device (3) consisting of a nut (35).
The circulating pipe 51 of claim 1, wherein one side of the main tank 1 is connected through the upper end of the main tank 1, and the other side of the main tank 1 is horizontally extended to the rear, and the circulation pipe 51 vertically bent at the top of the auxiliary tank 2, A supply pipe 52 connected through the lower part of the auxiliary water tank 2 and branched to one or more positions that are forward than the position at which the stern tube bearing 4 is mounted to supply sea water, and the supply pipe 52 It is characterized in that it consists of a seawater circulator 5 consisting of a pump 53 mounted in the middle of) and two or more control valves 54 mounted on the supply pipe 52 in front and rear of the pump 53. Durability test device for stern tube bearings.
The first mounting rib 141 of claim 1, wherein a rear surface of the main water tank (1) has a diameter larger than that of the load nut (35), the inner diameter surface of which extends rearward, and the rear end thereof extends in a normal direction. And an entrance hole 14 having a plurality of first bolt holes 142 radially spaced along the first mounting ribs 141.
It is formed in a disk shape having a second bolt hole 151 corresponding to the first bolt hole 142 and is fixed by a pair of bolts 61 and nuts 62 and provided with a handle 152 on the rear surface. An entry hole cover 15;
It is formed between the first mounting rib 141 and the mounting hole cover 15 having a third bolt hole 161 corresponding to the first and second bolt holes 142 and 151 having a ring shape. Durability test apparatus for stern tube bearing, characterized in that it further comprises a first gasket (16). According to claim 1, wherein the mounting hole 11 has a diameter larger than the diameter of the shaft 34, the inner diameter surface is extended forward and the front end is a second mounting ribs 111 extending in the normal direction, and A plurality of fourth bolt holes 112 formed radially at regular intervals along the second mounting ribs 111;
In the center, a shaft insertion hole 171 is formed to be inserted corresponding to the diameter of the shaft 34 and extends in the normal direction, and then vertically bent forward. The third mounting rib 172 extends in the normal direction. And a packing box having a plurality of fifth bolt holes 173 radially formed along the third mounting ribs 172 at regular intervals;
A sixth bolt hole 181 having a ring shape and corresponding to the fourth and fifth bolt holes 112 and 151 is inserted between the second mounting rib 111 and the third mounting rib 172. A second gasket 18;
Has an inner diameter larger than the outer diameter of the shaft 34 and an outer diameter smaller than the inner diameter of the third mounting rib 172 of the packing box 17, the front is extended in the normal direction to form a fourth mounting rib 191 And a fixed flange 19 having a plurality of seventh bolt holes 192 radially spaced along the fourth mounting ribs 191.
The fourth to seventh bolt holes 112, 173, 181, while the fixing flange presses the front of the gland packing member 341 inserted into the space between the shaft 34 from the front of the packing box 17. Durability test apparatus of the stern tube bearing, characterized in that configured to be fixed by a pair of bolts (61) and nuts (62) that are inserted into and fixed to the 192. The end of the shaft 34 is provided with a load nut inserting portion 342 whose outer diameter is reduced in size, and a fixing hole 343 formed in the center direction at the outer diameter surface adjacent to the rear end. ;
The load nut 35 is formed in a disc shape and has a coupling hole 351 having an inner diameter corresponding to the load nut inserting portion 342 at the center thereof, and at least one pair formed at a symmetrical direction in the center direction from the outer diameter surface thereof. A lifting hole 352 is inserted into the load nut inserting section 342;
Durability test apparatus of the stern tube bearing, characterized in that it further comprises a fixture (36) having a fixing projection (361) that is inserted corresponding to the fixing hole (343) on one side.

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