Mounting and positioning device and mounting and positioning method for marine diesel engine gearbox

Abstract

The invention provides a mounting and positioning device and method for a marine diesel engine gearbox, and relates to the technical field of ship engineering.The mounting and positioning device comprises a first tensioning sleeve, a second tensioning sleeve and a double-thread screw, and the first tensioning sleeve is arranged on a guide shaft of a crankshaft in a sleeving mode; a first conical surface is formed on one side, far away from the guide shaft, of the first tensioning sleeve; the second tensioning sleeve is sleeved with an oil seal hole of the gearbox, and a second conical face is formed on the side, away from the oil seal hole, of the second tensioning sleeve. The second conical surface is matched with the first conical surface; the double-thread screw comprises a first stud and a second stud which are opposite in rotation direction, the first stud is in threaded fit with the first tensioning sleeve, and the second stud is in threaded fit with the second tensioning sleeve; when the double-thread screw rotates in the forward direction, the radial thickness of the first tensioning sleeve and the radial thickness of the second tensioning sleeve are increased so that tensioning can be achieved. On the contrary, the radial thicknesses of the two parts are reduced to realize loosening; the mounting and dismounting are convenient, and the mounting precision can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship engineering, and in particular to an installation and positioning device and an installation and positioning method for a marine diesel engine gearbox. Background Art

[0002] The gearbox is an important part of the diesel engine. Its installation accuracy affects the service life of the diesel engine and the stability of its operation. There is an oil seal hole for installing a skeleton oil seal on the gearbox. After installation, it is necessary to ensure that the center of the oil seal hole is coaxial with the center of the crankshaft diameter, and then install the skeleton oil seal. Only by ensuring that the center of the oil seal hole is coaxial with the center of the crankshaft diameter can the skeleton oil seal not be deformed after installation. The function of the skeleton oil seal is to prevent lubricating oil leakage, especially when the crankshaft rotates at high speed. If the skeleton oil seal is slightly deformed during installation, it is easy to cause lubricating oil leakage. Therefore, the installation accuracy and quality of the gearbox directly affect the lubricating oil leakage problem.

[0003] However, when installing the gearbox, it is usually pre-tightened with bolts on the end face of the diesel engine body, and then installed on the body through two locating pins. Although the locating pin installation accuracy is high, due to the accumulation of processing errors, the coaxiality between the crankshaft diameter center and the oil seal hole center on the gearbox cannot be guaranteed, resulting in deformation of the installed skeleton oil seal. When the diesel engine is running, oil leakage problems will occur, and the installation accuracy is relatively low. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an installation and positioning device and an installation and positioning method for a marine diesel engine gearbox, which utilizes a double-headed screw to adjust the first tensioning sleeve and the second tensioning sleeve to move away from each other or relative to each other, so that the guide shaft of the crankshaft and the oil seal hole of the gearbox can be tightened or loosened, thereby solving the technical problem of low installation accuracy of the existing gearbox by improving the coaxiality.

[0005] To achieve the above object, the present invention provides an installation and positioning device for a marine diesel engine gearbox, comprising:

[0006] A first tension sleeve, the first tension sleeve is sleeved on the guide shaft of the crankshaft; a first conical surface is formed on a side of the first tension sleeve away from the guide shaft;

[0007] A second tension sleeve, the second tension sleeve is arranged in the oil seal hole of the gear box, and a second conical surface is formed on a side of the second tension sleeve away from the oil seal hole; the second conical surface matches the first conical surface;

[0008] A double-ended screw, comprising a first stud and a second stud with opposite rotation directions, wherein the first stud is threadedly matched with a first tension sleeve, and the second stud is threadedly matched with a second tension sleeve;

[0009] When the double-headed screw rotates forward, the radial thickness of the first tension sleeve and the second tension sleeve increases to achieve tension; conversely, the radial thickness of the first tension sleeve and the second tension sleeve decreases to achieve loosening.

[0010] Preferably, the first tension sleeve includes a first connecting sleeve matched with the first stud, and the second tension sleeve includes a second connecting sleeve matched with the second stud; a guide sleeve is integrally formed at the end of the second connecting sleeve, and the guide sleeve can be slidably mounted on the first connecting sleeve.

[0011] Preferably, the first tension sleeve and the first connecting sleeve are integrally connected via a first connecting frame, and the second tension sleeve and the guide sliding sleeve are integrally connected via a second connecting frame; and both the first connecting frame and the second connecting frame are provided with weight-reducing holes.

[0012] Preferably, a first guide cone is formed on the outer side surface of one end of the first tensioning sleeve, and the first guide cone is used to guide the first tensioning sleeve to be mounted on the guide shaft; a second guide cone is formed on the inner side surface of one end of the second tensioning sleeve, and the second guide cone is used to guide the second tensioning sleeve to be mounted on the oil seal hole.

[0013] Preferably, it also includes:

[0014] A connecting head, the connecting head is fixedly connected to the double-headed screw;

[0015] The rotating handle is fixed on the connecting head at an angle, and the rotating handle drives the double-headed screw to rotate through the connecting head.

[0016] Preferably, it also includes:

[0017] A driving motor, the driving motor is fixedly connected to the double-headed screw via a connecting flange;

[0018] A tensioning force detection member, the tensioning force detection member is used to detect the current tensioning force between the first tensioning sleeve and the second tensioning sleeve;

[0019] A voice prompter, used for issuing voice prompts;

[0020] The controller is electrically connected to the drive motor, the tensioning force detection component and the voice prompter respectively; when the tensioning force detection component detects that the current tensioning force reaches the set tensioning force, the controller controls the drive motor to stop according to the signal fed back by the tensioning force detection component and starts the voice prompter.

[0021] Preferably, it also includes:

[0022] A radial thickness detection member, the radial thickness detection member is electrically connected to the controller; the radial thickness detection member is used to detect the current radial thickness of the first tensioning sleeve and the second tensioning sleeve;

[0023] An alarm device, the alarm device is electrically connected to the controller;

[0024] When the thickness detection component detects that the current radial thickness reaches the maximum set thickness, and the tension detection component detects that the current tension does not reach the set tension, the controller activates the alarm according to the feedback signals from the radial thickness detection component and the tension detection component, and controls the drive motor to stop.

[0025] Preferably, it also includes:

[0026] A coaxiality detector, which is electrically connected to the controller; the coaxiality detector is used to detect the current coaxiality between the guide shaft and the oil seal hole;

[0027] When the coaxiality detector detects that the current coaxiality is within the set range, the controller controls the drive motor to continue rotating according to the signal fed back by the coaxiality detector;

[0028] When the coaxiality detector detects that the current coaxiality is not within the set range, the controller activates the alarm according to the signal fed back by the coaxiality detector and controls the drive motor to stop.

[0029] Preferably, it also includes:

[0030] A first speed detection member, the first speed detection member is used to detect the linear speed of the first tensioning sleeve when the driving motor rotates;

[0031] A second speed detection member, the second speed detection member is used to detect the linear speed of the second tensioning sleeve when the driving motor rotates;

[0032] The first speed detection member and the second speed detection member are electrically connected to the controller respectively; when the first speed detection member detects that the linear speed of the first tensioning sleeve is zero, and / or the second speed detection member detects that the linear speed of the second tensioning sleeve is zero, the controller activates the alarm and controls the drive motor to stop.

[0033] The present invention also provides a method for installing and positioning a marine diesel engine gearbox, which is applied to the installation and positioning device for the marine diesel engine gearbox, comprising:

[0034] The first tension sleeve and the second tension sleeve are respectively sleeved on the first stud and the second stud of the double-headed screw;

[0035] Sleeve the first tension sleeve on the guide shaft of the crankshaft;

[0036] Insert the second tension sleeve into the oil seal hole of the gear box;

[0037] The double-headed screw is rotated forward, and the first tension sleeve and the second tension sleeve move in opposite directions, and the radial thickness of the first tension sleeve and the second tension sleeve increases to achieve tension;

[0038] Fix the gearbox to the chassis;

[0039] The double-headed screw is rotated in the opposite direction, the first tension sleeve and the second tension sleeve move relative to each other, and the radial thickness of the first tension sleeve and the second tension sleeve becomes smaller to achieve loosening.

[0040] Compared with the background technology, the installation and positioning device of the marine diesel engine gearbox provided by the present invention includes a first tensioning sleeve, a second tensioning sleeve and a double-headed screw. The first tensioning sleeve is arranged on the guide shaft of the crankshaft, and the second tensioning sleeve is arranged in the oil seal hole of the gearbox. The first tensioning sleeve cooperates with the first stud thread of the double-headed screw, and the second tensioning sleeve cooperates with the second stud thread of the double-headed screw. The first conical surface of the first tensioning sleeve cooperates with the second conical surface.

[0041] When the double-headed screw rotates forward, the first tensioning sleeve and the second tensioning sleeve move in opposite directions, so that the radial thickness of the first tensioning sleeve and the second tensioning sleeve becomes larger, thereby achieving tensioning; when the double-headed screw rotates reversely, the first tensioning sleeve and the second tensioning sleeve move relative to each other, so that the radial thickness of the first tensioning sleeve and the second tensioning sleeve becomes smaller, thereby achieving loosening.

[0042] The present invention utilizes a double-headed screw to adjust the first tensioning sleeve and the second tensioning sleeve to move away from each other or relative to each other, which not only facilitates the removal of the entire device, but also can improve the coaxiality between the oil seal hole of the gear box and the guide shaft of the crankshaft by tightening the gap between the guide shaft and the oil seal hole, thereby reducing the risk of oil leakage caused by deformation of the skeleton oil seal and improving the installation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 A state diagram of a marine diesel engine gearbox installation positioning device provided by a specific embodiment of the present invention being tightened between a guide shaft of a crankshaft and an oil seal hole of the gearbox;

[0045] Figure 2 for Figure 1 A partial enlarged view of middle A.

[0046] The reference numerals are as follows:

[0047] Crankshaft 01 and gearbox 02;

[0048] Guide shaft 011;

[0049] Oil seal hole 021;

[0050] A first tensioning sleeve 1, a second tensioning sleeve 2, a double-headed screw 3, a weight-reducing hole 4, a connecting head 5 and a rotating handle 6;

[0051] A first conical surface 11, a first connecting sleeve 12, a first connecting frame 13 and a first guiding conical surface 14;

[0052] A second conical surface 21, a second connecting sleeve 22, a guide sleeve 23, a second connecting frame 24 and a second guide conical surface 25;

[0053] The first stud 31 and the second stud 32 . DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0056] The embodiment of the present invention provides a mounting and positioning device for a marine diesel engine gearbox, which is suitable for being installed between a guide shaft 011 of a crankshaft 01 and an oil seal hole 021 of a gearbox 02. Figure 1 and 2 As shown, it includes a first tension sleeve 1, a second tension sleeve 2 and a double-headed screw 3. The first tension sleeve 1 is sleeved on the guide shaft 011 of the crankshaft 01. The first tension sleeve 1 has a first conical surface 11 formed on the side away from the guide shaft 011, and an inner cylindrical surface is formed on the side facing the guide shaft 011. The inner cylindrical surface can slide with the outer side of the guide shaft 011. The second tension sleeve 2 is sleeved in the oil seal hole 021 of the gear box 02. The second tension sleeve 2 has a second conical surface 21 formed on the side away from the oil seal hole 021, and an outer cylindrical surface is formed on the side facing the oil seal hole 021. The outer cylindrical surface can slide with the inner side of the oil seal hole 021.

[0057] The first conical surface 11 of the first tensioning sleeve 1 cooperates with the second conical surface 21 of the second tensioning sleeve 2 to form a self-centering structure, which automatically adjusts the position of the gear box 02 relative to the crankshaft 01 during installation to ensure a high degree of coaxiality between the guide shaft 011 of the crankshaft 01 and the oil seal hole 021 of the gear box 02; moreover, the first tensioning sleeve 1 and the second tensioning sleeve 2 are designed in a split manner, which facilitates disassembly of the entire device during installation, reduces installation difficulty, and improves installation efficiency.

[0058] The double-ended screw 3 includes a first stud 31 and a second stud 32 with opposite rotation directions, the first stud 31 is threadedly matched with the first tension sleeve 1, and the second stud 32 is threadedly matched with the second tension sleeve 2. As a preferred embodiment, the first stud 31 is a left-handed thread, and the second stud 32 is a right-handed thread; accordingly, the small-diameter ends of the first conical surface 11 of the first tension sleeve 1 and the second conical surface 21 of the second tension sleeve 2 are both facing the double-ended screw 3.

[0059] When the double-headed screw 3 rotates forward, the first tension sleeve 1 and the second tension sleeve 2 move in opposite directions, and the large diameter ends of the first tension sleeve 1 and the second tension sleeve 2 move closer to each other, so that the radial thickness of the first tension sleeve 1 and the second tension sleeve 2 increases, and the whole device is tightened between the guide shaft 011 of the crankshaft 01 and the oil seal hole 021 of the gear box 02. When the double-headed screw 3 rotates in the reverse direction, the first tension sleeve 1 and the second tension sleeve 2 move relative to each other, and the large diameter ends of the first tension sleeve 1 and the second tension sleeve 2 separate from each other, so that the radial thickness of the first tension sleeve 1 and the second tension sleeve 2 decreases, and the whole device is loosened, making it easier to disassemble.

[0060] The present invention utilizes the double-headed screw 3 to adjust the first tensioning sleeve 1 and the second tensioning sleeve 2 to move away from each other or relative to each other, which not only facilitates the removal of the entire device, but also improves the coaxiality between the oil seal hole 021 of the gear box 02 and the guide shaft 011 of the crankshaft 01 by tightening the gap between the guide shaft 011 and the oil seal hole 021, thereby reducing the risk of oil leakage caused by deformation of the skeleton oil seal and improving the installation accuracy.

[0061] As a preferred embodiment, the first tension sleeve 1 includes a first connection sleeve 12 matched with the first stud 31, and the second tension sleeve 2 includes a second connection sleeve 22 matched with the second stud 32; the end of the second connection sleeve 22 is integrally formed with a guide sleeve 23, the guide sleeve 23 is coaxial with the second connection sleeve 22, and the guide sleeve 23 can be slidably sleeved on the first connection sleeve 12, and is used for the double-headed screw 3 of the first tension sleeve 1 and the second tension sleeve 2 to perform linear motion in the axial direction. Specifically, a first threaded hole is formed at the center of the first connection sleeve 12, and the first threaded hole is threadedly matched with the first stud 31. A second threaded hole is formed at the center of the second connection sleeve 22, and the second threaded hole is threadedly matched with the second stud 32. The guide sleeve 23 is a cylindrical structure extending from one end of the second connection sleeve 22 along the axial direction of the second connection sleeve 22.

[0062] The first tensioning sleeve 1 is integrally connected to the first connecting sleeve 12 via the first connecting frame 13, and the second tensioning sleeve 2 is integrally connected to the guide sleeve 23 via the second connecting frame 24; both the first connecting frame 13 and the second connecting frame 24 are provided with weight-reducing holes 4 for reducing the weight of the entire device, facilitating manual disassembly and assembly, with less installation difficulty and higher installation efficiency.

[0063] A first guide cone 14 is formed on the outer side surface of one end of the first tension sleeve 1. When installing the first tension sleeve 1, the large diameter end of the first guide cone 14 first cooperates with the guide shaft 011, so that the first guide cone 14 guides the first tension sleeve 1 to be sleeved on the guide shaft 011, thereby reducing the difficulty of installing the first tension sleeve 1 and the guide shaft 011. A second guide cone 25 is formed on the inner side surface of one end of the second tension sleeve 2. When installing the second tension sleeve 2, the small diameter end of the second guide cone 25 first enters the oil seal hole 021 for cooperation, so that the second guide cone 25 guides the second tension sleeve 2 to be sleeved on the oil seal hole 021, thereby reducing the difficulty of installing the second tension sleeve 2 and the oil seal hole 021.

[0064] As a preferred embodiment, the double-headed screw 3 is manually driven. The installation and positioning device of the present invention also includes a connector 5 and a rotating handle 6, and the connector 5 is fixedly connected to the double-headed screw 3. Specifically, one end of the double-headed screw 3 is provided with an extension portion, and the extension portion is coaxially arranged with the double-headed screw 3. The connector 5 is sleeved on the extension portion, and the end of the extension portion is equipped with a locking screw to lock and fix the connector 5 on the extension portion. The connector 5 is fixed with a plurality of rotating handles 6, and the rotating handles 6 manually drive the double-headed screw 3 to rotate through the connector 5, so that the first tensioning sleeve 1 and the second tensioning sleeve 2 move away from each other or relative to each other. In order to facilitate holding the rotating handle 6, the rotating handle 6 is fixed to the connector 5 at an angle. Specifically, one end of the connector 5 is formed with an outer conical surface, and the rotating handle 6 is fixed to the outer conical surface along the generatrix direction of the outer conical surface.

[0065] In addition to the manual drive mode, the double-headed screw 3 can also be electrically driven. The installation and positioning device of the present invention also includes a driving motor, a tension detection member, a voice prompter and a controller. The driving motor is fixedly connected to the double-headed screw 3 through a connecting flange and is used to drive the double-headed screw 3 to rotate. The tension detection member is used to detect the current tension between the first tension sleeve 1 and the second tension sleeve 2. The tension detection member can be a pressure sensor, but is not limited to this. The controller is electrically connected to the driving motor, the tension detection member and the voice prompter respectively.

[0066] When the tensioning force detection component detects that the current tensioning force reaches the set tensioning force, the first tensioning sleeve 1 and the second tensioning sleeve 2 are in a tensioning state, and the tensioning force detection component feeds back a signal to the controller. After judgment and processing, the controller sends a command to the drive motor and the voice prompter to control the drive motor to automatically stop to avoid excessive tension between the first tensioning sleeve 1 and the second tensioning sleeve 2. At the same time, the controller starts the voice prompter, and the voice prompter emits a "beep, beep, beep" prompt sound to remind the operator that the whole device has completed the tensioning.

[0067] When the tension detection part detects that the current tension does not reach the set tension, the tension detection part feeds back a signal to the controller, and the controller controls the drive motor to continue rotating until the set tension is reached. The set tension in this article refers to the maximum tension when the first tension sleeve 1 and the second tension sleeve 2 are tightened.

[0068] Taking into account that the first tension sleeve 1 and the second tension sleeve 2 will have a certain degree of wear after long-term use, the installation and positioning device of the present invention also includes a radial thickness detection member and an alarm electrically connected to the controller respectively. The radial thickness detection member is used to detect the current radial thickness of the first tension sleeve 1 and the second tension sleeve 2. The radial thickness detection member can specifically be a thickness sensor, but is not limited to this.

[0069] When the thickness detection component detects that the current radial thickness has reached the maximum set thickness, and the tensioning force detection component detects that the current tensioning force has not reached the set tensioning force, that is, the thickness between the first tensioning sleeve 1 and the second tensioning sleeve 2 has reached the maximum but has not been tightened between the guide shaft 011 and the oil seal hole 021, the thickness detection component and the tensioning force detection component simultaneously send signals to the controller, and the controller sends instructions to the alarm and the drive motor after judgment and processing, automatically starting the alarm to remind the operator that the entire device cannot be tightened due to wear of the first tensioning sleeve 1 or the second tensioning sleeve 2, and at the same time controls the drive motor to stop.

[0070] The installation and positioning device of the present invention further comprises a coaxiality detector electrically connected to the controller, for detecting the current coaxiality between the guide shaft 011 and the oil seal hole 021 .

[0071] When the coaxiality detector detects that the current coaxiality is within the set range, it means that the whole device is working normally. The coaxiality detector feeds back a signal to the controller. After judgment and processing, the controller sends a command to the drive motor to control the drive motor to continue rotating until the whole device is tightened between the guide shaft 011 of the crankshaft 01 and the oil seal hole 021 of the gear box 02.

[0072] When the coaxiality detector detects that the current coaxiality is not within the set range, it means that the whole device is working abnormally due to factors such as foreign matter between the first tension sleeve 1 and the second tension sleeve 2. The coaxiality detector feeds back a signal to the controller, and the controller sends a command to the alarm and the drive motor after judgment and processing, automatically starting the alarm to remind the operator to repair the whole device in time, and at the same time control the drive motor to stop.

[0073] The installation and positioning device of the present invention also includes a first speed detection member and a second speed detection member respectively connected to the controller. The first speed detection member is used to detect the linear speed of the first tensioning sleeve 1 when the drive motor rotates, and the second speed detection member is used to detect the linear speed of the second tensioning sleeve 2 when the drive motor rotates. Both the first speed detection member and the second speed detection member can be speed sensors.

[0074] When the first speed detection component detects that the linear speed of the first tensioning sleeve 1 is zero, and / or the second speed detection component detects that the linear speed of the second tensioning sleeve 2 is zero, it means that when the double-headed screw 3 rotates, the first tensioning sleeve 1 and / or the second tensioning sleeve 2 cannot move due to damage to the thread of the double-headed screw 3. The controller sends instructions to the alarm and the drive motor according to the corresponding signals fed back by the first speed detection component and / or the second speed detection component, automatically starts the alarm, reminds the operator to repair the entire device in time, and controls the drive motor to stop at the same time.

[0075] The embodiment of the present invention further provides a method for installing and positioning a marine diesel engine gearbox, which is applied to the installation and positioning device of the marine diesel engine gearbox, comprising:

[0076] The first tension sleeve and the second tension sleeve are respectively sleeved on the first stud and the second stud of the double-headed screw;

[0077] Sleeve the first tension sleeve on the guide shaft of the crankshaft;

[0078] Insert the second tension sleeve into the oil seal hole of the gear box;

[0079] The double-headed screw is rotated forward, the first tension sleeve and the second tension sleeve move in opposite directions, the large diameter ends of the first tension sleeve and the second tension sleeve are brought closer to each other, the radial thickness of the first tension sleeve and the second tension sleeve increases, and the sleeve device is tightened between the guide shaft of the crankshaft and the oil seal hole of the gear box;

[0080] Fix the gearbox to the chassis;

[0081] The double-headed screw is rotated in the opposite direction, the first tension sleeve and the second tension sleeve move relative to each other, the large diameter ends of the first tension sleeve and the second tension sleeve are separated from each other, the radial thickness of the first tension sleeve and the second tension sleeve becomes smaller, the whole device is loosened, and disassembly is more convenient.

[0082] The installation and positioning method of a marine diesel engine gearbox provided by the present invention has the same beneficial effects as the technical solution of the installation and positioning device of the marine diesel engine gearbox mentioned above.

[0083] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0084] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A mounting and positioning device for a marine diesel engine gearbox, characterized in that: include: A first tension sleeve (1), the first tension sleeve (1) being sleeved on a guide shaft (011) of the crankshaft (01); a first conical surface (11) is formed on a side of the first tension sleeve (1) away from the guide shaft (011); a second tension sleeve (2), the second tension sleeve (2) being sleeved in an oil seal hole (021) of the gear box (02), a second conical surface (21) being formed on a side of the second tension sleeve (2) away from the oil seal hole (021); the second conical surface (21) being matched with the first conical surface (11); A double-ended screw (3), the double-ended screw (3) comprising a first stud (31) and a second stud (32) having opposite rotation directions, the first stud (31) being threadedly matched with the first tension sleeve (1), and the second stud (32) being threadedly matched with the second tension sleeve (2); When the double-headed screw (3) rotates in the forward direction, the radial thickness of the first tensioning sleeve (1) and the second tensioning sleeve (2) increases to achieve tensioning; conversely, the radial thickness of the first tensioning sleeve (1) and the second tensioning sleeve (2) decreases to achieve loosening.

2. The installation and positioning device for a marine diesel engine gearbox according to claim 1, characterized in that: The first tension sleeve (1) comprises a first connection sleeve (12) matched with the first stud (31), and the second tension sleeve (2) comprises a second connection sleeve (22) matched with the second stud (32); a guide sleeve (23) is integrally formed at the end of the second connection sleeve (22), and the guide sleeve (23) can be slidably mounted on the first connection sleeve (12).

3. The installation and positioning device for a marine diesel engine gearbox according to claim 2, characterized in that: The first tension sleeve (1) and the first connecting sleeve (12) are integrally connected via a first connecting frame (13), and the second tension sleeve (2) and the guide sliding sleeve (23) are integrally connected via a second connecting frame (24); the first connecting frame (13) and the second connecting frame (24) are both provided with weight-reducing holes (4).

4. The installation and positioning device for a marine diesel engine gearbox according to any one of claims 1 to 3, characterized in that: A first guide conical surface (14) is formed on an outer side surface of one end of the first tension sleeve (1), and the first guide conical surface (14) is used to guide the first tension sleeve (1) to be sleeved on the guide shaft (011); a second guide conical surface (25) is formed on an inner side surface of one end of the second tension sleeve (2), and the second guide conical surface (25) is used to guide the second tension sleeve (2) to be sleeved on the oil seal hole (021).

5. The installation and positioning device for a marine diesel engine gearbox according to any one of claims 1 to 3, characterized in that: Also includes: A connecting head (5), the connecting head (5) being fixedly connected to the double-headed screw (3); A rotating handle (6), the rotating handle (6) being fixedly mounted on the connecting head (5) at an angle, and the rotating handle (6) drives the double-headed screw (3) to rotate via the connecting head (5).

6. The installation and positioning device for a marine diesel engine gearbox according to any one of claims 1 to 3, characterized in that: Also includes: A drive motor, the drive motor being fixedly connected to the double-headed screw (3) via a connecting flange; A tensioning force detection member, the tensioning force detection member being used to detect a current tensioning force between the first tensioning sleeve (1) and the second tensioning sleeve (2); A voice prompter, used for issuing voice prompts; A controller is electrically connected to the drive motor, the tensioning force detection component and the voice prompter respectively; when the tensioning force detection component detects that the current tensioning force reaches the set tensioning force, the controller controls the drive motor to stop according to the signal fed back by the tensioning force detection component and starts the voice prompter.

7. The installation and positioning device for a marine diesel engine gearbox according to claim 6, characterized in that: Also includes: A radial thickness detection member, the radial thickness detection member being electrically connected to the controller; the radial thickness detection member being used to detect the current radial thickness of the first tension sleeve (1) and the second tension sleeve (2); an alarm, the alarm being electrically connected to the controller; When the thickness detection component detects that the current radial thickness reaches the maximum set thickness, and the tensioning force detection component detects that the current tensioning force does not reach the set tensioning force, the controller activates the alarm based on the feedback signals from the radial thickness detection component and the tensioning force detection component, and controls the drive motor to stop.

8. The installation and positioning device for a marine diesel engine gearbox according to claim 7, characterized in that: Also includes: A coaxiality detector, the coaxiality detector being electrically connected to the controller; the coaxiality detector being used to detect the current coaxiality between the guide shaft (011) and the oil seal hole (021); When the coaxiality detector detects that the current coaxiality is within a set range, the controller controls the driving motor to continue rotating according to a signal fed back by the coaxiality detector; When the coaxiality detector detects that the current coaxiality is not within the set range, the controller activates the alarm according to a signal fed back by the coaxiality detector and controls the drive motor to stop.

9. The installation and positioning device for a marine diesel engine gearbox according to claim 7, characterized in that: Also includes: A first speed detection member, the first speed detection member being used to detect the linear speed of the first tension sleeve (1) when the drive motor rotates; A second speed detection member, the second speed detection member being used to detect the linear speed of the second tension sleeve (2) when the drive motor rotates; The first speed detection member and the second speed detection member are electrically connected to the controller respectively; when the first speed detection member detects that the linear speed of the first tensioning sleeve (1) is zero, and / or the second speed detection member detects that the linear speed of the second tensioning sleeve (2) is zero, the controller activates the alarm and controls the drive motor to stop.

10. A method for installing and positioning a marine diesel engine gearbox, characterized in that: The installation and positioning device for a marine diesel engine gearbox according to any one of claims 1 to 9 comprises: The first tension sleeve and the second tension sleeve are respectively sleeved on the first stud and the second stud of the double-headed screw; Sleeve the first tension sleeve on the guide shaft of the crankshaft; Inserting the second tension sleeve into the oil seal hole of the gear box; The double-headed screw is rotated forward, the first tension sleeve and the second tension sleeve move away from each other, and the radial thickness of the first tension sleeve and the second tension sleeve increases to achieve tension; The gear box is fixed to the chassis; The double-headed screw is rotated in the opposite direction, the first tension sleeve and the second tension sleeve move relative to each other, and the radial thickness of the first tension sleeve and the second tension sleeve decreases to achieve loosening.

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