A temporary locking device and locking method for a marine shafting

Abstract

The present application relates to a kind of temporary locking device of marine shafting, including threaded sleeve, lock shaft slider, slide rail, support, slide rail is installed on support, lock shaft slider is slidably installed on slide rail, lock shaft slider can be linearly moved along slide rail;Lock shaft slider is equipped with limit hole corresponding threaded sleeve, threaded sleeve is used to install on the bolt of shafting flange, threaded sleeve is equipped with the internal screw hole of screw thread cooperation with bolt;Lock shaft slider is moved along slide rail, and limit hole is covered outside threaded sleeve.The temporary locking device of marine shafting of the present application is installed on the bolt of marine shafting flange by threaded sleeve cooperation, lock shaft slider is moved along slide rail, and is covered outside threaded sleeve by limit hole, one side realizes the temporary locking of marine shafting, and the other side can also play the protection of bolt external thread.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, in particular to a temporary locking device for a ship shafting and a locking method. BACKGROUND

[0002] In a ship with double propulsion shafting, if a shafting fails or needs to be repaired, a specific shafting locking device is usually used to lock the shafting, so as to avoid the water flow driving the propeller and the shafting locking device to rotate the shafting, so as to avoid the water flow driving the propeller and the shafting to rotate, so as to ensure the safety of the ship power equipment.

[0003] Taking the 174K and 80K two types of LNG transport ships currently built in China as examples, both types of ships adopt a double-engine double-propeller power arrangement as a propulsion system, and are directly driven by a dual-fuel low-speed diesel engine. In this type of shafting arrangement, the disc-plate brake disc, disc-plate stop bolt and disc-plate notch block type shaft locking devices are widely used. These widely used shaft locking devices need to process and install a high-precision brake disc on the overall structure of the ship, not only the structure is complex, but also the procurement and installation costs are high.

[0004] The prior art such as the patent application for invention with publication number CN109625230A discloses a ship shafting locking device, which comprises a flange, a round head bolt, a locking plate, a rotating pin and a base. The round head bolts are uniformly distributed on the circumference of the flange. The locking plate is connected to the base through the rotating pin, and the locking plate is provided with a slot hole into which the round head bolt can be inserted. The base is welded to the ship bottom plate, the locking plate is rotated towards the flange and locked with the round head bolts at any two suitable positions, and then the stop pin is inserted into the pin hole and tightened.

[0005] The prior art such as the utility model patent with publication number CN201516919U discloses a propeller shaft locking device, which comprises a support and a brake block. One end of the brake block is provided with a lock head which can be inserted between the connecting bolt pairs of the propeller shaft flange. The brake block is inserted between the two connecting bolt pairs to achieve the locking of the propeller shaft.

[0006] The above-mentioned shaft locking device hooks the side surface of the bolt through the locking plate or limits the position by inserting the brake block between the two bolts during use. During the locking process, the propeller and the shafting will rotate due to the water flow force, at which time the bolt is under great stress, which may damage the threads on the surface of the bolt and affect the normal use of the shafting. SUMMARY

[0007] In order to solve the above problems, the application provides a temporary locking device and a locking method for a ship shafting, which can achieve the purpose of temporary locking of the ship shafting and avoid damaging the bolts on the shafting flange.

[0008] The technical purpose of the application is achieved by the following technical solutions:

[0009] The temporary locking device for the ship shafting comprises a threaded sleeve, a locking shaft sliding block, a sliding rail and a support, the sliding rail is installed on the support, the locking shaft sliding block is slidingly installed on the sliding rail, and the locking shaft sliding block can move linearly along the sliding rail; a limiting hole is arranged on the locking shaft sliding block corresponding to the threaded sleeve, the threaded sleeve is used to be installed on the bolt of the shafting flange, the threaded sleeve is provided with an internal screw hole matched with the bolt thread, and the locking shaft sliding block is sleeved with the outside of the threaded sleeve after moving along the sliding rail.

[0010] Further, the locking shaft sliding block comprises a triangular plate, the limiting hole is arranged at one corner of the triangular plate, and sliding blocks used to cooperate with the sliding rail to slide are arranged at the other two corners of the triangular plate, and the sliding blocks are provided with sliding holes matched with the sliding rail; the sliding rail comprises two parallel sliding rods, the sliding rods are in a cylindrical shape, and the two sliding rods pass through the sliding hole of one sliding block respectively. The triangular plate can avoid the limiting hole from colliding with the adjacent bolt when the limiting hole is sleeved with the threaded sleeve.

[0011] Further, the outside of the threaded sleeve is in a conical shape, and the inner wall of the limiting hole is provided with a slope matched with the conical shape of the outside of the threaded sleeve.

[0012] Further, the sliding block is provided with a threaded hole communicated with the sliding hole, a positioning pin used to limit the movement of the sliding block along the sliding rod is installed in the threaded hole in a sleeving mode, the positioning pin is in screw thread cooperation with the threaded hole, and the sliding rod is provided with a positioning groove used to cooperate with the positioning pin at the position close to the two ends.

[0013] Further, the support comprises two parallel vertical columns, and the two ends of the two sliding rods are connected with the two vertical columns in a perpendicular mode.

[0014] Further, a connecting piece is connected between the end of the sliding rod and the vertical column, and the sliding rod and the vertical column are detachably connected through the connecting piece.

[0015] Further, the threaded sleeve is made of plastic material, which can reduce the damage to the thread of the bolt on the shafting flange and avoid the threaded sleeve from being locked with the thread of the bolt on the shafting flange.

[0016] The application further provides a temporary locking method for a ship shafting, which comprises the following steps:

[0017] Step 1, preparing a threaded sleeve matched with the thread of the bolt according to the specification of the bolt on the shafting flange of the ship;

[0018] Step 2, installing the threaded sleeve to the end of one of the bolts of the shafting flange.

[0019] Step 3, install the lock shaft slider, slide rail and support according to the position of the thread sleeve, the slide rail is parallel to the ship shafting, adjust the position of the support to ensure that the limiting hole can cover the thread sleeve when the lock shaft slider moves along the slide rail, and weld the support on the ship structure;

[0020] Step 4, when the ship shafting needs to be temporarily locked, rotate the ship shafting to be locked to the locking position by means of the turning machine, and move the lock shaft slider along the slide rail to make the limiting hole fit the outside of the thread sleeve.

[0021] Further, the thread sleeve is installed on the end of the bolt, the elastic washer is installed on the bolt, the thread sleeve is installed on the end of the bolt, and the elastic washer is located between the thread sleeve and the nut on the bolt. After the thread sleeve extrudes the elastic washer, the elastic washer can generate a counterforce on the thread sleeve to prevent the thread sleeve from rotating after installation.

[0022] Further, the slide rail is provided with a positioning groove at the position close to both ends, and the lock shaft sleeve is further provided with a positioning pin for positioning the lock shaft sleeve, and the positioning pin is inserted into the positioning groove to fix the position of the lock shaft sleeve.

[0023] Compared with the prior art, the beneficial effects of the present application are:

[0024] (1) The temporary locking device of the ship shafting of the present application is installed on the bolt of the flange of the ship shafting through the thread sleeve, and the lock shaft slider is sleeved on the outside of the thread sleeve through the limiting hole after moving along the slide rail. On the one hand, it realizes the temporary locking of the ship shafting, and on the other hand, it also protects the external threads of the bolt.

[0025] (2) Compared with the existing locking method, the limiting hole of the present application can tightly fit the outside of the thread sleeve, and after locking, the ship shafting will not rotate. However, the existing method of locking the side of the bolt by the locking plate or limiting by inserting the brake block between the two bolts has a gap for easy installation. After the ship shafting is locked, it will appear a small degree of deflection. Similarly, the brake block is inserted between the bolts, and a gap is left for easy insertion. During the later use, the ship shafting will also rotate slightly.

[0026] (3) The support structure of the temporary locking device of the ship shafting of the present application is simple and relatively small, and the installation position can be selected as needed. During the later use, when the ship shafting needs to be temporarily locked, the device can be repeatedly used without disassembly, and it will not occupy too much space.

[0027] (4) Compared with existing products, the design of this invention does not require an additional brake disc to match the shaft flange, which can reduce the configuration cost of the brake disc. Without the brake disc, the bolt length on the shaft flange will also be reduced. The bolts are generally selected as hydraulic bolts, and the price varies with the length. The cost will also increase with the increase in length. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the temporary locking device for ship shafting in this invention.

[0029] Figure 2 This is a schematic diagram of the threaded sleeve in this invention being installed on the bolts of the ship's shafting flange.

[0030] Figure 3 This is a diagram showing the usage status of the temporary locking device for ship shafting in this invention.

[0031] In the diagram, 1. Threaded sleeve; 2. Limiting hole; 3. Triangular plate; 4. Slider; 5. Sliding hole; 6. Sliding rod; 7. Locating pin; 8. Locating groove; 9. Column; 10. Bolt; 11. Bolt; 12. Nut; 13. Shaft flange; 14. Ship shafting. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to specific embodiments:

[0033] A temporary locking device for ship shafting, such as Figures 1-3 As shown, it includes a threaded sleeve 1, a locking slider, a slide rail, and a support. The slide rail is mounted on the support, and the locking slider is slidably mounted on the slide rail. The locking slider can move linearly along the slide rail. The locking slider has a limiting hole 2 corresponding to the threaded sleeve 1. The threaded sleeve 1 is used to install on the bolts of the shaft flange. The threaded sleeve 1 has an internal threaded hole that mates with the bolt thread. After the locking slider moves along the slide rail, the limiting hole 2 covers the outside of the threaded sleeve 1. Preferably, the threaded sleeve is made of plastic.

[0034] Specifically, such as Figure 1 As shown, the locking shaft slider includes a triangular plate 3, a limiting hole 2 is set at one corner of the triangular plate 3, and sliders 4 for sliding with the slide rail are respectively set at the other two corners of the triangle. The sliders 4 are provided with sliding holes 5 for sliding with the slide rail. The slide rail includes two parallel sliding rods 6, which are cylindrical. The two sliding rods 6 pass through the sliding holes 5 of one slider 4 respectively.

[0035] The outer surface of the threaded sleeve 1 is tapered, and the inner wall of the limiting hole 2 is provided with a bevel that matches the tapered shape of the outer surface of the threaded sleeve 1, ensuring that the limiting hole fits well against the outer surface of the threaded sleeve and increasing the contact area.

[0036] The sliding block 4 is provided with a threaded hole communicating with the sliding hole 5, and a positioning pin 7 is arranged in the threaded hole to limit the movement of the sliding block 4 along the slide rod 6, the positioning pin 7 being screwed with the threaded hole; the slide rod 6 is provided with a positioning groove 8 at the position close to the two ends for cooperating with the positioning pin 7.

[0037] The support comprises two vertical columns 9, and the two ends of the two slide rods 6 are connected with the two vertical columns 9 respectively. A connecting piece is connected between the end of the slide rod 6 and the vertical column 9, and in the embodiment, the connecting piece is connected with the end of the slide rod 6 through a bolt 10 passing through the vertical column 9.

[0038] The embodiment also provides a temporary locking method of the ship shafting, which is performed by the temporary locking device of the ship shafting.

[0039] Step 1: according to the specification of the bolt 11 on the flange 12 of the ship shafting, a threaded sleeve 1 matched with the thread of the bolt 11 is prepared;

[0040] Step 2: the threaded sleeve 1 is installed at the end of one of the bolts 11 of the shafting flange 13;

[0041] Step 3: according to the position of the threaded sleeve 1, a locking shaft sliding block, a slide rail and a support are installed, the slide rail is parallel to the ship shafting, the position of the support is adjusted to ensure that the limiting hole 2 can cover the threaded sleeve 1 when the locking shaft sliding block moves along the slide rail, and the support is welded on the ship structure, such as a ship structure plate;

[0042] Step 4: when the temporary locking of the ship shafting 14 is needed, the ship shafting to be locked is rotated to the locking position by means of a turning machine, the locking shaft sliding block is moved along the slide rail to make the limiting hole 2 fit the outside of the threaded sleeve 1, then the positioning pin 7 is inserted into the positioning groove 8 to fix the position of the locking shaft sliding block, and the temporary locking of the ship shafting is completed.

[0043] When the temporary locking of the ship shafting 14 is not needed, the locking shaft sliding block is moved along the slide rail to make the locking shaft sliding block disengage from the threaded sleeve, and then the positioning pin 7 is inserted into the positioning groove 8 at the other end of the slide rail to position the locking shaft sliding block.

[0044] Preferably, the threaded sleeve 1 is installed at the end of the bolt 11 on one side of the shafting flange 13, an elastic gasket such as an O-shaped rubber gasket is installed on the bolt 11, and the threaded sleeve 1 is installed at the end of the bolt 11, and the elastic gasket is located between the threaded sleeve 1 and the nut 12 on the bolt.

[0045] The embodiment is further explanation of the present application, and is not limitation of the present application, and the person skilled in the art can make non-creative modification to the embodiment according to the need after reading the specification, but as long as in the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A temporary locking device for ship shafting, characterized in that, The system includes a threaded sleeve, a locking slider, a slide rail, and a support. The slide rail is mounted on the support, and the locking slider is slidably mounted on the slide rail, allowing it to move linearly along the slide rail. The locking slider has a limiting hole corresponding to the threaded sleeve. The threaded sleeve is used to install on bolts of a shaft flange, and it has an internal threaded hole that mates with the bolt thread. After the locking slider moves along the slide rail, the limiting hole covers the outside of the threaded sleeve. The locking slider includes a triangular plate, with the limiting hole located at one corner of the triangular plate. Slider blocks for sliding along the slide rail are located at the other two corners of the triangular plate, and each slider has a sliding hole that mates with the slide rail. The slide rail includes two parallel cylindrical sliding rods, each passing through a sliding hole of a slider. The outer surface of the threaded sleeve is conical, and the inner wall of the limiting hole has an inclined surface that matches the conical shape of the threaded sleeve. The support includes two parallel columns, with the ends of the two sliding rods perpendicularly connected to the two columns.

2. A temporary locking device for ship shafting according to claim 1, characterized in that, The slider is provided with a threaded hole that connects to the sliding hole. A positioning pin is installed in the threaded hole to restrict the movement of the slider along the slide rod. The positioning pin is threadedly engaged with the threaded hole. The slide rod is provided with positioning grooves near both ends to engage with the positioning pins.

3. A temporary locking device for ship shafting according to claim 1, characterized in that, A connector is provided between the end of the slide rod and the column, and the slide rod and the column are detachably connected by the connector.

4. A temporary locking device for ship shafting according to claim 1, characterized in that, The threaded sheath is made of plastic.

5. A method for temporarily locking a ship's shafting system, the method comprising using the temporary locking device for a ship's shafting system as described in any one of claims 1-4, the method comprising: Step 1: Prepare threaded sleeves that match the bolt threads according to the specifications of the bolts on the ship's shafting flange; Step 2: Install the threaded sleeve onto the end of one of the bolts on the shaft flange; Step 3: Install the locking shaft slider, slide rail and support according to the position of the threaded sleeve. The slide rail is set parallel to the ship's shafting. Adjust the position of the support to ensure that the limiting hole can fit the threaded sleeve when the locking shaft slider moves along the slide rail. Weld the support to the hull structure. Step 4: When it is necessary to temporarily lock the ship's shaft system, use a turning machine to rotate the ship's shaft system to be locked to the locking position, and move the locking slider along the slide rail to make the limiting hole fit with the outside of the threaded sleeve.

6. A temporary locking method for a ship shafting system according to claim 5, characterized in that, Before the threaded sleeve is installed on the bolt end, an elastic washer is installed on the bolt. After the threaded sleeve is installed on the bolt end, the elastic washer is located between the threaded sleeve and the nut on the bolt.

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