JPS634533Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic lubricant application device for lifting racks of offshore work platforms.

A jack-up type offshore work platform has a pedestal that supports the ship's body on the seabed and can be raised and lowered, and a pinion of a jack-up device installed on the ship's hull is engaged with a rack provided on the pedestal, and the pinion is connected to a reduction gear train. The pillar is raised and lowered relative to the hull by driving a motor through the shaft. It is necessary to supply a high viscosity lubricant to the engaging tooth surfaces of the rack and pinion because a large load is applied to them due to the weight of the ship's hull or pedestal.

Therefore, conventionally, a high viscosity lubricant was atomized and sprayed onto the tooth surface using a lubricating device shown in FIG. That is, when a command signal for raising and lowering the pillar is issued from the control panel 1, the solenoid valve 2 opens, compressed air for operation is sent from the compressed air source 3 to the lubricant supply pump 4, which rotates the lubricant supply pump 4. The lubricant is circulated at high speed in a circuit including the tank 5, the switching valve 6, the pipe 7, the control valve 8, the pipe 9, the switching valve 6, and the tank 5. The lubricant is made by suspending molybdenum disulfide or copper powder in grease, and it is circulated at high speed to prevent the suspended matter from settling inside the pipes during the circulation. When it is detected that the rack is at a position suitable for lubricating, the control valve 8 is closed in response to a command signal a from the control panel 1 to stop the flow of lubricant. As a result, the pressure inside the tube 7 increases, and a certain amount of lubricant metered by the metering valve 10 is atomized and sprayed from the injection valve 11 and applied to the tooth surface of the rack. Since the suspended matter tends to settle in the pipe on the inflow side of the control valve 8, the flow direction of the lubricant is occasionally switched by the switching valve 6 to prevent the settling.

However, the above-mentioned conventional lubricating device uses precision valves in the high pressure circuit because it is necessary to feed at high pressure in order to atomize and inject high viscosity lubricant, but these precision valves are Therefore, the service life is short and reliability is easily deteriorated.In addition, the atomized lubricant adheres to various parts of the ship's hull, staining it, or falls onto the sea surface, causing oil pollution. There were flaws.

The object of the present invention is to propose an automatic lubricant application device for lifting racks of offshore work platforms, which eliminates the above-mentioned drawbacks of conventional oil supply devices.

In this case, a housing that covers a part of the rack of the pedestal is attached to the hull, and a support arm for a lubricant application roller that is pressed against the tooth surface of the rack by a spring is placed inside the housing. The roller is pivotably mounted so that it can roll along the tooth surface of the rack when raised and lowered, and has a structure in which lubricant is supplied from the outside to the roller through the pivot shaft of the arm and applied to the tooth surface of the rack.

An illustrated embodiment of the present invention will be described below. Second
In the figure, 12 is the hull, 13 is a pedestal, and 14 is a rack fixed to the pedestal, which engages with a pinion of a jack up device (not shown) to raise and lower the pedestal 13. The tips of the upper and lower fixing brackets 15 and 16 protruding from the hull 12 toward the rack 14 and the rack 1
The upper and lower ends of a casing 17 enclosing both sides of the housing 17 are connected by connecting rods 18 and 19, respectively, so as to be swingable from side to side and in a vertically tensioned state in the figure.

The casing 17 has a side plate 20 that is in contact with one side of the rack 14 and a side plate 2 that is in contact with the bent end portion 21 on the other side.
2 and a pair of upper and lower guide plates 24 which are located between the side plates 20 and 22 and are in contact with the tooth head surface 23 of the rack 14, are connected to each other, and the connecting position of the connecting rods 18 and 19 to the brackets 15 and 16 is determined. By slightly shifting it towards the rack 14, the guide plate 24 is brought into pressure contact with the tooth head surface 23, thereby allowing the housing 17 to be guided and slid in a fixed position relative to the rack 14. The upper and lower guide plates 24 are spaced apart by approximately one pitch of rack teeth.

Between the side plate 22 and the rack 14, the side plate 2
The upper and lower ends of a pair of upper and lower arms 25, 26 are pivotally connected to the shaft 27 by a shaft 27, and both arms 25, 2
Lubricant application rollers 29 and 30, which contact the rack tooth surfaces 28, are rotatably supported on opposing inner ends of the rack 14, respectively, and the rollers 29 and 30 are arranged so that they can alternately enter the bottom of the teeth of the rack 14. Determine the diameter and position. Compression springs 31 are placed between the upper and lower spring holders protruding from the side plate 22 and the arms 25 and 26, respectively.
are interposed to keep both rollers 29 and 30 in pressure contact with the rack tooth surface 28 at all times.

The rollers 29 and 30 are made of an oil-impregnated material such as felt or sponge, and the support shaft 32 is a hollow shaft with a closed end, and has a large number of oil holes 33 on its surface. 34 to axis 27
and a series of oil passages 3 formed in the arms 25 and 26.
By forcing lubricant through the rollers 29 and 30, the rollers 29 and 30 are kept in an oil-impregnated state.

When the pillar 13 is lowered from the position shown in FIG.
The roller 29 is pushed by the rack tooth surface 28 and the arm 2
5 is rotated counterclockwise against the pressure of the spring 31, and when it passes over the tooth head surface 23, the spring 31 causes it to roll along the rack tooth surface 28 toward the bottom of the tooth. Further, the roller 30 follows the roller 29 and rolls along the rack tooth surface 28 while swinging the arm 26. As the rollers 29 and 30 roll, the lubricant is applied almost uniformly to the entire rack tooth surface 28 including the tooth head surface 23.

When the rack 14 is raised, lubricant is applied to the rack tooth surfaces 28 in the same manner as described above.

The present invention has the above-mentioned configuration, and the lubricant-impregnated roller presses against the tooth surface of the rack as the rack moves up and down to apply the lubricant, so there is no need for high-pressure feeding to spray the lubricant. The valve for feeding the agent is
The suction and discharge valves of a single-acting lubricant feed pump with a maximum pressure of about 12 kg/cm ² are all that is needed, no valves are used in the lubricant applicator itself, and the applicator structure is extremely simple, making it inexpensive overall. The lubricant is applied only to the tooth surface, so it does not stain other parts or pollute the seawater.

[Brief explanation of drawings]

Fig. 1 is a refueling circuit diagram of a conventional device, Fig. 2 is a vertical cross-sectional view of an embodiment of the present invention, and Fig. 3 is a line A-A in Fig. 2.
A line sectional view, FIG. 4 is an enlarged sectional view of a main part of the lubricant passage in FIG. 3. 12... Hull, 13... Pillar, 14... Lifting rack, 17... Housing, 23... Tooth surface, 25,
26...Arm, 27...Arm pivot shaft, 28...
...Rack tooth surface, 29, 30...Roller, 32...
Roller shaft, 33, 35...oil passage.

Claims (1)

[Scope of utility model registration request] The hull of an offshore work platform having a pedestal for jacking up is provided with a casing that is in contact with the tooth surface of a lifting rack provided on the pedestal and guided up and down relative to the rack, and the base end is mounted inside the casing. A lubricant application roller, which is pressed against the toothed surface by spring pressure, is freely rotatably supported on a fixed roller shaft at the tip of an arm that is freely pivoted, and the roller is connected to the arm pivot shaft, the arm, and the roller shaft. This is an automatic lubricant application device for lifting racks of offshore work platforms, which has a series of oil passages for supplying lubricant.