Method for removing a shaft sleeve of a ship shafting

Abstract

The present application relates to the ship technology field, especially a kind of ship shafting shaft sleeve's dismantling method, comprising the following steps: S1, along the extension direction of shaft is set in the both ends of tool plate connection assembly, the end of connection assembly away from tool plate is set annular plate, annular plate is sleeved on the shaft, and with the end surface of shaft sleeve is attached, heating assembly is arranged on shaft sleeve;S2, hydraulic cylinder is set between tool plate and shaft, the bottom of hydraulic cylinder and tool plate abut, the end surface of the piston rod of hydraulic cylinder and shaft abuts;S3, start heating assembly to shaft sleeve heating, until the temperature of shaft sleeve reaches set temperature value, and continue for set time;S4, start hydraulic cylinder, so that the piston rod of hydraulic cylinder extends, promotes tool plate to drive annular plate to move, until shaft sleeve separates from the shaft under the action of annular plate, ship shafting shaft sleeve's dismantling method includes.The present application can reduce the damage to shaft and shaft sleeve in the separation process, reduce economic loss.

Description

Technical Field

[0001] This invention relates to the field of marine technology, and in particular to a method for removing a shaft sleeve from a ship's shafting system. Background Technology

[0002] The ship's shafting system is a key component connecting the ship's engine and propeller, and is an indispensable part of the ship's power system. The bushing is an important mechanical part installed between the rotating shaft and the supporting components of the ship's shafting system. The bushing's function is to reduce friction between the shaft and the bearing housing, reduce energy loss, prevent direct wear between the shaft and the bearing housing, extend the shaft's service life, and also reduce noise and vibration, improving the stability and reliability of the power equipment.

[0003] Shafts and bushings are generally installed using a hot-sleeve method, which utilizes the principle of thermal expansion and contraction of metals. However, during installation, problems such as insufficient smoothness of the outer circumference of the shaft and the inner surface of the bushing, or the presence of burrs, can cause the shaft and bushing to jam. When this happens, it is necessary to disassemble the shaft and bushing. Currently, this is generally done by hammering or conventional pulling. Existing methods rely heavily on manual experience to control the force and direction, which is difficult to operate and can easily damage the shaft and bushing, causing greater economic losses.

[0004] Therefore, a method for removing the shaft sleeves of a ship's shafting system is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for removing shaft sleeves from a ship shafting system, which can reduce damage to the shaft and sleeves during the separation process and reduce economic losses.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The method for removing the bushings of a ship's shafting system includes the following steps:

[0008] S1. Connecting components are provided at both ends of the tooling plate along the extension direction of the shaft. An annular plate is provided at the end of the connecting component away from the tooling plate. The annular plate is sleeved on the shaft and fits against the end face of the shaft sleeve. A heating component is arranged on the shaft sleeve.

[0009] S2. A hydraulic cylinder is provided between the tooling plate and the shaft, the bottom of the hydraulic cylinder abuts against the tooling plate, and the piston rod of the hydraulic cylinder abuts against the end face of the shaft;

[0010] S3. Start the heating component to heat the bushing until the temperature of the bushing reaches the set temperature value, and continue for a set time.

[0011] S4. Start the hydraulic cylinder, causing the piston rod of the hydraulic cylinder to extend and push the tooling plate to move the annular plate until the bushing is separated from the shaft under the action of the annular plate.

[0012] In some embodiments, in step S1, the connecting assembly includes a first screw, a first nut, and a second nut. A first end of the first screw passes through the tooling plate, the first nut is screwed to the first end of the first screw, a second end of the first screw passes through the annular plate, and the second nut is screwed to the second end of the first screw.

[0013] In some embodiments, in step S1, the heating assembly includes an electric heating blanket and a controller that are electrically connected to each other, and the electric heating blanket is wrapped around the outer peripheral surface of the bushing.

[0014] In some embodiments, in step S3, the set temperature value is not lower than 120°C, and the set time is not lower than 20 minutes.

[0015] In some embodiments, in step S3, an infrared thermometer is used to detect the temperature of the bushing.

[0016] In some embodiments, step S4 includes the following steps:

[0017] S41. Pressurize the hydraulic cylinder to the first set pressure value;

[0018] S42. Check whether the bushing has been displaced relative to the shaft. If so, control the piston rod of the hydraulic cylinder to continue extending at the first set pressure value until the bushing separates from the shaft.

[0019] In some embodiments, in step S42, if not, the hydraulic cylinder is pressurized until the bushing is displaced relative to the shaft, and the piston rod of the hydraulic cylinder is controlled to continue extending at the current pressure value until the bushing separates from the shaft.

[0020] In some embodiments, the hydraulic cylinder is supplied with oil by a hydraulic oil pump, and a pressure gauge is installed on the hydraulic oil pump to detect the oil pressure.

[0021] In some embodiments, in step S4, if the pressure of the hydraulic cylinder changes beyond a set threshold within a set time range, the hydraulic oil pump is controlled to stop pumping oil to the hydraulic cylinder, thereby stopping the hydraulic cylinder from working.

[0022] In some embodiments, in step S4, when the piston rod of the hydraulic cylinder extends to its limit, if the bushing is not separated from the shaft, the piston rod of the hydraulic cylinder is controlled to retract, and then the distance from the tooling plate to the end face of the shaft is adjusted. The piston rod of the hydraulic cylinder is then controlled to extend again, and the above steps are repeated until the bushing is separated from the shaft.

[0023] The beneficial effects of this invention are:

[0024] This invention provides a method for removing a ship shafting bushing. First, a dismantling fixture is assembled and a heating assembly is placed. Connecting components are installed at both ends of the fixture plate along the shaft's extension direction. An annular plate is placed at the end of the connecting component furthest from the fixture plate, and this annular plate fits onto the shaft, conforming to the end face of the bushing. The heating assembly is then placed on the bushing. Next, a hydraulic cylinder is positioned: its bottom abuts against the fixture plate, and its piston rod abuts against the end face of the shaft. The bushing is then heated: the heating assembly is activated to heat the bushing until it reaches a set temperature, which is maintained for a set time. Finally, the bushing is removed from the shaft using the hydraulic cylinder. By heating the bushing, the inner diameter expands due to thermal expansion, facilitating separation of the bushing from the shaft. Using a hydraulic cylinder for separation ensures a smooth and stable separation process, avoiding the hard damage to the shaft and bushing caused by traditional methods, thus reducing economic losses. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0026] Figure 1 This is a flowchart of a method for removing a ship shafting bushing according to the present invention;

[0027] Figure 2 This is a schematic diagram of the tooling used in a method for removing a ship shafting bushing according to the present invention.

[0028] In the picture:

[0029] 100, Shaft; 200, Bushing; 1, Tooling Plate; 2, Connecting Assembly; 21, First Screw; 22, First Nut; 23, Second Nut; 3, Heating Assembly; 31, Electric Heating Blanket; 32, Controller; 4, Hydraulic Cylinder; 41, Hydraulic Oil Pump; 5, Annular Plate. Detailed Implementation

[0030] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0031] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0032] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0033] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0034] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0035] The ship's shafting system is a key component connecting the ship's engine and propeller, and is an indispensable part of the ship's power system. The bushing is an important mechanical part installed between the rotating shaft and the supporting components of the ship's shafting system. The bushing's function is to reduce friction between the shaft and the bearing housing, reduce energy loss, prevent direct wear between the shaft and the bearing housing, extend the shaft's service life, and also reduce noise and vibration, improving the stability and reliability of the power equipment.

[0036] When jamming occurs during the installation of the shaft and bushing, disassembly of the shaft and bushing is necessary. To minimize damage to the shaft and bushing during separation and reduce economic losses, such as... Figures 1-2 As shown, this invention provides a method for removing a ship shafting bushing. The method for removing a ship shafting bushing includes the following steps:

[0037] S1. Connecting components 2 are provided at both ends of the tooling plate 1 along the extension direction of shaft 100. An annular plate 5 is provided at the end of the connecting component 2 away from the tooling plate 1. The annular plate 5 is sleeved on shaft 100 and fits against the end face of bushing 200. Heating components 3 are arranged on bushing 200.

[0038] S2. A hydraulic cylinder 4 is installed between the tooling plate 1 and the shaft 100. The bottom of the hydraulic cylinder 4 abuts against the tooling plate 1, and the piston rod of the hydraulic cylinder 4 abuts against the end face of the shaft 100.

[0039] S3. Start the heating component 3 to heat the bushing 200 until the temperature of the bushing 200 reaches the set temperature value, and continue for the set time.

[0040] S4. Start hydraulic cylinder 4, causing the piston rod of hydraulic cylinder 4 to extend and push tooling plate 1 to move annular plate 5 until bushing 200 separates from shaft 100 under the action of annular plate 5.

[0041] Heating the bushing 200 expands its inner diameter using thermal expansion, facilitating separation from the shaft 100. Using a hydraulic cylinder 4 for separation ensures a smooth and stable process, avoiding the hard damage to the shaft 100 and bushing 200 caused by traditional methods, thus reducing economic losses.

[0042] In some embodiments, in step S1, the connecting assembly 2 includes a first screw 21, a first nut 22, and a second nut 23. The first end of the first screw 21 passes through the tooling plate 1, the first nut 22 is screwed to the first end of the first screw 21, the second end of the first screw 21 passes through the annular plate 5, and the second nut 23 is screwed to the second end of the first screw 21.

[0043] In some embodiments, in step S1, the heating assembly 3 includes an electric heating blanket 31 and a controller 32 that are electrically connected to each other. The electric heating blanket 31 is wrapped around the outer peripheral surface of the bushing 200. By using the electric heating blanket 31, which has a certain degree of flexibility, it can effectively cover and wrap around the bushing 200, thereby ensuring uniform heating of the bushing 200 from all directions and guaranteeing the heating effect. By setting the controller 32, the current can be controlled, thereby effectively controlling the temperature of the electric heating blanket 31.

[0044] In some embodiments, in step S3, the set temperature value is not lower than 120°C, and the set time is not lower than 20 minutes. Specifically, the set temperature value is in the range of 120°C-150°C. The corresponding set temperature can be selected for bushings 200 of different thicknesses, allowing for targeted heating based on the type of bushing 200. After reaching the set temperature, heating for a certain period ensures that the bushing 200 is sufficiently heated and expanded, thus facilitating its removal from the shaft 100.

[0045] In some embodiments, in step S3, an infrared thermometer is used to detect the temperature of the bushing 200. The infrared thermometer is dustproof, waterproof, and resistant to electromagnetic interference, and can work stably in harsh environments (such as workshops and outdoors). Moreover, it can collect temperature without contact, making it easy to operate and use, and can quickly obtain the real-time temperature of the bushing 200.

[0046] In some embodiments, step S4 includes the following steps:

[0047] S41. Pressurize hydraulic cylinder 4 to the first set pressure value;

[0048] S42. Check if the bushing 200 has displacement relative to the shaft 100. If so, control the piston rod of the hydraulic cylinder 4 to continue extending at the first set pressure value until the bushing 200 separates from the shaft 100. In this embodiment, the first set pressure value is 5 MPa. When the pressure is increased to the first set pressure value, the bushing 200 has displacement relative to the shaft 100, indicating that the separation operation can be completed. Therefore, it is only necessary to continue the operation at this first set pressure value. At the same time, it can ensure that the separation process is carried out smoothly, thereby reducing the impact on the shaft 100 and the bushing 200.

[0049] In some embodiments, in step S42, if not, the hydraulic cylinder 4 is pressurized until the bushing 200 is displaced relative to the shaft 100, and the piston rod of the hydraulic cylinder 4 is controlled to continue extending at the current pressure value until the bushing 200 separates from the shaft 100. This configuration ensures that the bushing 200 and the shaft 100 can separate smoothly.

[0050] In some embodiments, the hydraulic cylinder 4 is supplied with oil by a hydraulic oil pump 41, and a pressure gauge is installed on the hydraulic oil pump 41 to detect the oil pressure. Specifically, a three-position four-way directional valve is installed between the hydraulic cylinder 4 and the oil pump. The oil inlet of the three-position four-way directional valve is connected to the hydraulic oil pump 41, the first control port of the three-position four-way directional valve is connected to the rod chamber of the hydraulic cylinder 4, the second control port of the three-position four-way directional valve is connected to the rodless chamber of the hydraulic cylinder 4, and the oil return port of the three-position four-way directional valve is connected to the oil tank. By controlling the three-position four-way directional valve, the piston rod of the hydraulic cylinder 4 can be controlled to extend and retract. By installing a pressure gauge, the supplied hydraulic oil pressure can be detected.

[0051] In some embodiments, in step S4, if the pressure of the hydraulic cylinder 4 changes beyond a set threshold within a set time range, the hydraulic oil pump 41 is controlled to stop pumping oil to the hydraulic cylinder 4, causing the hydraulic cylinder 4 to stop working. Specifically, when the pressure of the hydraulic cylinder 4 changes particularly large in a short period of time, it indicates that there is a jamming phenomenon between the bushing 200 and the shaft 100. At this time, it is necessary to stop the separation of the bushing 200 and the shaft 100 to prevent hard damage to the bushing 200 and the shaft 100.

[0052] In some embodiments, in step S4, when the piston rod of the hydraulic cylinder 4 extends to its limit, if the bushing 200 and the shaft 100 are not separated, the piston rod of the hydraulic cylinder 4 is controlled to retract. Then, the distance between the tooling plate 1 and the end face of the shaft 100 is adjusted, and the piston rod of the hydraulic cylinder 4 is controlled to extend again. The above steps are repeated until the bushing 200 and the shaft 100 are separated. In this way, the separation of a relatively long shaft 100 and bushing 200 can be completed.

[0053] In some embodiments, when the pressure gauge displays 0 pressure during the removal process, it indicates that the bushing 200 has been completely removed. Remove the tooling and inspect the shaft 100 and bushing 200 for any minor damage; if any is found, repair it.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for removing shaft sleeves from a ship's shafting system, characterized in that, Includes the following steps: S1. Connecting components (2) are provided at both ends of the tooling plate (1) along the extension direction of the shaft (100). An annular plate (5) is provided at the end of the connecting component (2) away from the tooling plate (1). The annular plate (5) is sleeved on the shaft (100) and fits against the end face of the bushing (200). A heating component (3) is arranged on the bushing (200). S2. A hydraulic cylinder (4) is provided between the tooling plate (1) and the shaft (100). The bottom of the hydraulic cylinder (4) abuts against the tooling plate (1), and the piston rod of the hydraulic cylinder (4) abuts against the end face of the shaft (100). S3. Start the heating component (3) to heat the bushing (200) until the temperature of the bushing (200) reaches the set temperature value, and continue for a set time; S4. Start the hydraulic cylinder (4) so ​​that the piston rod of the hydraulic cylinder (4) extends and pushes the tooling plate (1) to move the annular plate (5) until the bushing (200) is separated from the shaft (100) under the action of the annular plate (5); In step S1, the connecting assembly (2) includes a first screw (21), a first nut (22), and a second nut (23). The first end of the first screw (21) passes through the tooling plate (1), the first nut (22) is screwed to the first end of the first screw (21), the second end of the first screw (21) passes through the annular plate (5), and the second nut (23) is screwed to the second end of the first screw (21). Step S4 includes the following steps: S41. Pressurize the hydraulic cylinder (4) to the first set pressure value; S42. Check whether the bushing (200) has displacement relative to the shaft (100). If so, control the piston rod of the hydraulic cylinder (4) to continue to extend at the first set pressure value until the bushing (200) separates from the shaft (100). In step S42, if not, the hydraulic cylinder (4) is pressurized until the bushing (200) is displaced relative to the shaft (100), and the piston rod of the hydraulic cylinder (4) is controlled to continue to extend at the current pressure value until the bushing (200) separates from the shaft (100); In step S4, when the piston rod of the hydraulic cylinder (4) extends to its limit, if the bushing (200) and the shaft (100) are not separated, the piston rod of the hydraulic cylinder (4) is controlled to retract, and then the distance between the tooling plate (1) and the end face of the shaft (100) is adjusted, and the piston rod of the hydraulic cylinder (4) is controlled to extend again. The above steps are repeated until the bushing (200) and the shaft (100) are separated.

2. The method for removing the shaft sleeve of a ship's shafting system according to claim 1, characterized in that, In step S1, the heating assembly (3) includes an electric heating blanket (31) and a controller (32) that are electrically connected to each other, and the electric heating blanket (31) is wrapped around the outer peripheral surface of the bushing (200).

3. The method for removing the shaft sleeve of a ship's shafting system according to claim 1, characterized in that, In step S3, the set temperature value is not lower than 120°C, and the set time is not lower than 20 minutes.

4. The method for removing the shaft sleeve of a ship's shafting system according to claim 1, characterized in that, In step S3, an infrared thermometer is used to detect the temperature of the bushing (200).

5. The method for removing the shaft sleeve of a ship shafting system according to claim 1, characterized in that, The hydraulic cylinder (4) is supplied with oil by a hydraulic oil pump (41), and a pressure gauge is installed on the hydraulic oil pump (41) to detect the oil pressure.

6. The method for removing the shaft sleeve of a ship's shafting system according to claim 5, characterized in that, In step S4, if the pressure of the hydraulic cylinder (4) changes beyond a set threshold within a set time range, the hydraulic oil pump (41) is controlled to stop pumping oil to the hydraulic cylinder (4), so that the hydraulic cylinder (4) stops working.

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