Self-aligning lifting device for marine diesel engine piston and its use method

Abstract

The present invention discloses a self-aligning lifting device for a marine diesel engine piston and a method for using the device, which is used to lift a piston body. The lifting device includes a calibration positioning portion located inside the piston body and an alignment clamping portion provided on the outer wall of the calibration positioning portion. The present invention provides a calibration positioning portion, which contacts the inner wall of the piston body through a clamping member, so that the calibration cylinder is located at the center of the piston body. After the lifting equipment lifts the piston body out of the placement area, the positioning arm in the alignment clamping portion, driven by a linkage member, causes the positioning block to automatically snap into the piston ring groove on the outer wall of the piston body, and the support plate contacts the bottom of the piston body, completing the self-aligning clamping positioning of the piston body by the lifting device. Manual adjustment is not required. On the other hand, the method of snapping into the piston ring groove is adopted, and no additional groove is manually opened on the outer wall of the piston body. This saves use costs and does not extend the piston processing cycle.

Description

Technical Field

[0001] The invention relates to the technical field of piston hoists, in particular to a self-aligning hoisting device for a marine diesel engine piston and a use method thereof. Background Art

[0002] The piston is one of the three major moving parts of a marine diesel engine and one of the parts with the most demanding working conditions. One end of the piston head has a groove to facilitate the assembly of components such as the piston rod. Currently, when processing diesel engine pistons, it is necessary to connect the piston through a lifting device, and then connect the lifting device through a lifting device to lift the piston to the designated position.

[0003] Traditional piston lifting typically requires creating a groove on the piston's outer wall, which is then engaged by a claw in a lifting device, allowing the piston to be lifted by a lifting device. This method has the following drawbacks: The groove must be created in advance, increasing the piston processing cycle and cost. Furthermore, the groove is only used for lifting and has no effect later, which impacts the piston's strength and aesthetics. Furthermore, when engaging the claw in the lifting device with the groove, manual assistance is required to align the claw with the groove, increasing labor intensity. Therefore, we propose a self-aligning lifting device for marine diesel engine pistons and its use method. Summary of the Invention

[0004] The object of the present invention is to provide a self-aligning lifting device for a marine diesel engine piston and a method of use thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A self-aligning lifting device for a marine diesel engine piston is used to lift the piston body. The lifting device includes a calibration positioning portion located inside the piston body and an aligning clamping portion provided on the outer wall of the calibration positioning portion.

[0007] The calibration positioning portion includes a calibration cylinder located inside the piston body, a clamping member provided on the outer wall of the calibration cylinder, and a movable seat movably provided on the calibration cylinder via a T-shaped rod and an elastic member. The clamping member is used to contact the inner wall of the piston body to drive the calibration cylinder to the center of the piston body. The movable seat is used to move relative to the calibration cylinder during hoisting, and a lifting ring portion is provided on the movable seat.

[0008] The alignment-type clamping portion includes a plurality of support frames arranged in a circular array on the calibration cylinder, the support frames are located above the piston body, the outer end rotating shaft of the support frames is connected to a positioning arm, a positioning block is provided on the positioning arm, and a support plate is integrated at the bottom end of the positioning arm, and a linkage member connected to the movable seat is provided on the support frame, and the linkage member drives the positioning arm to flip when the movable seat moves upward, so that the positioning block is stuck in the piston ring groove on the outer wall of the piston body, and the support plate contacts the bottom of the piston body.

[0009] A further improvement is that the clamping member includes a telescopic rod arranged at the axis of the calibration cylinder, one end of the telescopic rod is rotatably connected to the inner wall of the bottom of the calibration cylinder, and the other end extends into the movable seat and is connected to the output end of the rotating device arranged in the movable seat, the outer wall of the telescopic rod in the calibration cylinder is sleeved with a gear part, the circumferential outer wall of the calibration cylinder is inserted with multiple groups of threaded sleeves, the connection between the threaded sleeve and the calibration cylinder is provided with a bearing, the inner end of the threaded sleeve is sleeved with a driven gear meshing with the gear part, the outer end of the threaded sleeve is threadedly inserted with a threaded rod, the outer end of the threaded rod is connected to an arc block for fitting with the inner wall of the piston body, the inner end of the arc block is connected to a T-shaped guide rod, and the T-shaped guide rod movably passes through the calibration cylinder.

[0010] A further improvement is that the linkage includes a movable frame arranged on the support frame, and the movable frame is slidably connected with a sliding opening opened on the support frame through a slider, and the slider is connected to the inner wall of one side of the sliding opening through a tension spring, and a guide wheel group is rotatably provided at the outer end of the inner cavity of the sliding opening, and a pull rope is wound around the outer side of the guide wheel group, one end of the pull rope is connected to the inner wall of one side of the movable frame facing the calibration cylinder, and the other end movably passes through the support frame and is connected to the movable seat, and the outer end of the top of the movable frame is rotatably provided with a roller that slides in contact with the inner wall of the positioning arm.

[0011] A further improvement is that the lifting ring portion includes a hollow seat provided on a movable seat, a lifting ring is movably inserted into the top of the hollow seat, a contact plate is provided at the bottom of the lifting ring, a return spring is provided between the contact plate and the inner wall of the hollow seat, a detection device is provided in contact with the bottom of the contact plate, the detection device is provided on the gas generator, the output end of the gas generator is connected to multiple groups of connecting pipes through a shunt pipe, the multiple groups of connecting pipes all pass through the side wall of the hollow seat and the corresponding positioning arm and are connected to the inflatable airbag buffer provided at the bottom of the positioning arm, and a solenoid valve controlled by the detection device is provided in the shunt pipe;

[0012] An electrical device is provided in the movable seat, and the electrical device includes a power supply device, a wireless device and a controller. After receiving a signal of contact with the contact plate, the detection device drives the solenoid valve to open, so that the gas in the gas generator enters the inflatable airbag buffer through the connecting pipe.

[0013] A further improvement is that a movable opening is opened through the positioning arm, a connecting block is fixedly provided at one end of the movable opening, the connecting block is fixedly sleeved on the outer wall of the rotating shaft, the rotating shaft is rotatably arranged at the outer end of the support frame and is connected to the support frame through a torsion spring, and a damping shock absorber is also provided between the connecting block and the inner wall of the other end of the movable opening.

[0014] A further improvement is that casters are provided at the bottom of the support plate, and the bottom ends of the casters are located below the bottom of the unexpanded inflatable airbag buffer.

[0015] A further improvement is that an outer wall of the arc block is provided with an arc-shaped rubber pad, and an outer side wall of the arc-shaped rubber pad is provided with anti-slip grooves.

[0016] A method for using a self-aligning lifting device for a marine diesel engine piston comprises the following steps using the aforementioned lifting device:

[0017] S1: Connect an external lifting device to the lifting ring part, and use the lifting device to move the lifting device to the piston body to be lifted, so that the calibration cylinder enters the piston body and contacts the inner wall of the piston body through the clamping member. After the clamping member contacts the inner wall of the piston body, the calibration cylinder is in the center of the piston body;

[0018] S2: Lift the lifting device with a lifting device. Under the action of the clamping part, the piston body leaves the placement area. Under the gravity of the piston body, the movable seat moves relative to the calibration cylinder, and then drives the positioning arm to flip through the linkage part, so that the positioning block is automatically aligned and inserted into the piston groove on the outer wall of the piston body, and the support plate contacts the bottom of the piston body. Finally, control the lifting equipment to transfer the piston body to the desired position.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The present invention is provided with a calibration positioning portion. After the calibration cylinder is controlled by the lifting equipment to enter the piston body, it is then contacted with the inner wall of the piston body through the clamping member, so that the calibration cylinder is located in the center of the piston body, so that the subsequent alignment clamping portion is clamped into the piston ring groove. After the lifting equipment lifts the piston body out of the placement area, the positioning arm in the alignment clamping portion is driven by the linkage member to automatically clamp the positioning block into the piston ring groove on the outer wall of the piston body. The support plate contacts the bottom of the piston body, completing the self-alignment and clamping positioning of the piston body by the lifting device. No manual adjustment is required. On the other hand, by clamping into the piston ring groove, there is no need to manually form a groove on the outer wall of the piston body, which saves use costs while not extending the piston processing cycle and not affecting the strength and aesthetics of the piston.

[0021] 2) The present invention is also provided with a lifting ring. When the hook is damaged or the rope connecting the hook is broken during lifting, and the piston body drives the lifting device to fall downward, the gas generator supplies air to the inflatable airbag buffer, and the inflatable airbag buffer contacts the contact surface to buffer the impact force. In addition, multiple groups of positioning arms are opened outward to contact the contact surface, which increases the contact area on the one hand and further buffers the impact force through the damping shock absorber on the other hand, effectively avoiding damage to the piston body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 For the present invention Figure 1 Structural cross-section view;

[0024] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure A;

[0025] Figure 4 It is a structural schematic diagram of the lifting ring portion of the present invention.

[0026] In the figure: 1. Calibration cylinder; 2. Telescopic rod; 3. Electrical component; 4. Movable seat; 5. Rotating device; 6. Gear component; 7. Threaded sleeve; 8. Threaded rod; 9. Arc block; 10. Driven gear; 11. Support frame; 12. Positioning arm; 13. Positioning block; 14. Support plate; 15. T-bar; 16. Movable frame; 17. Tension spring; 18. Pull rope; 19. Roller; 20. Caster; 21. Hollow seat; 22. Lifting ring; 23. Return spring; 24. Detection device; 25. Gas generator; 26. Connecting pipe; 27. Inflatable airbag buffer; 28. Connecting block; 29. ​​Damping shock absorber; 30. Piston body. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] Please see the attached Figure 1 -Attached Figure 2 A self-aligning lifting device for a marine diesel engine piston is used to lift a piston body 30. For example, the piston body 30 includes a column with a groove at one end, and a surface of the column is provided with a plurality of piston ring grooves for later assembly of sealing rings.

[0030] The lifting device includes a calibration positioning portion located in the piston body 30 and an alignment clamping portion provided on the outer wall of the calibration positioning portion;

[0031] The calibration positioning portion includes a calibration cylinder 1 located in the piston body 30, a clamping member provided on the outer wall of the calibration cylinder 1, and a movable seat 4 movably provided on the calibration cylinder 1 through a T-shaped rod 15 and an elastic member. Specifically, one end of the T-shaped rod 15 is connected to the top of the calibration cylinder 1, and the other end extends into the movable seat 4. The elastic member is sleeved on the outer wall of the T-shaped rod 15 and its two ends are respectively connected to the end of the T-shaped rod 15 and the inner wall of the movable seat 4; initially, the hoisting device is connected to the external hoisting equipment and the calibration cylinder 1 is adjusted to enter the piston body 30. The clamping piece is used to contact the inner wall of the piston body 30 (specifically, the inner wall of the groove of the column) to drive the calibration cylinder 1 to the center of the piston body 30. This arrangement facilitates the subsequent alignment of the alignment-type clamping portion with the piston ring groove on the outer wall of the piston body 30; the movable seat 4 is used to move relative to the calibration cylinder 1 during hoisting. When the piston body 30 is hoisted, since the calibration cylinder 1 is connected to the piston body 30 through the clamping piece, the movable seat 4 and the calibration cylinder 1 move under the action of gravity. The movable seat 4 is provided with a lifting ring portion;

[0032] The alignment-type locking portion includes a plurality of support frames 11 arranged in a circular array on the calibration cylinder 1. The support frame 11 is L-shaped and can be fixedly connected to the calibration cylinder 1 by welding or bolts. The support frame 11 is located above the piston body 30. The outer end rotating shaft of the support frame 11 is connected to the positioning arm 12, and the positioning arm 12 is provided with a positioning block 13. The bottom end of the positioning arm 12 is integrated with a support plate 14. The support frame 11 is provided with a linkage connected to the movable seat 4. When the movable seat 4 moves upward, the linkage drives the positioning arm 12 to flip, so that the positioning block 13 is stuck in the piston ring groove on the outer wall of the piston body 30, and the support plate 14 contacts the bottom of the piston body 30. During lifting, the piston body 30 is first lifted off the ground by the action of the clamping member, and then under the action of gravity, the movable seat 4 drives the linkage member to flip the positioning arm 12, and the positioning block 13 on the positioning arm 12 is automatically stuck in the piston ring groove of the piston body 30, and the support plate contacts the bottom of the piston body 30, further positioning the piston body 30, making the piston body 30 more stable during lifting and not easy to fall.

[0033] Preferably, the clamping member of this embodiment includes a telescopic rod 2 arranged at the axis of the calibration cylinder 1, one end of the telescopic rod 2 is rotatably connected to the inner wall of the bottom of the calibration cylinder 1, and the telescopic rod 2 can be specifically rotatably connected to the inner wall of the bottom of the calibration cylinder 1 using a bearing, and the other end extends to the movable seat 4 and is connected to the output end of the rotating device 5 arranged in the movable seat 4. The rotating device 5 is, for example, a motor and a reducer. The outer wall of the telescopic rod 2 in the calibration cylinder 1 is provided with a gear part 6, and the gear part 6 specifically includes a disk body provided on the outer wall of the telescopic rod 2 and teeth uniformly provided on the disk body in an annular array. The circumferential outer wall of the calibration cylinder 1 is inserted with multiple sets of threads The sleeve 7, the threaded sleeve 7 and the calibration cylinder 1 are connected with a bearing so that the threaded sleeve 7 will not move relative to the calibration cylinder 1. The inner end of the threaded sleeve 7 is provided with a driven gear 10 meshing with the gear member 6. When the gear member 6 rotates, it drives multiple groups of driven gears 10 to rotate synchronously in the same direction. The outer end of the threaded sleeve 7 is threaded with a threaded rod 8. The outer end of the threaded rod 8 is connected to an arc block 9 for fitting with the inner wall of the piston body 30. The inner end of the arc block 9 is connected to a T-shaped guide rod, and the T-shaped guide rod movably passes through the calibration cylinder 1. The arc block 9 and the threaded rod 8 are restricted from rotating with the threaded sleeve 7 by the T-shaped guide rod.

[0034] Furthermore, the outer wall of the arc block 9 is provided with an arc-shaped rubber pad, and the outer side wall of the arc-shaped rubber pad is provided with anti-slip grooves. Through this arrangement, the fixing force of the clamping member on the piston body 30 is increased, so that when lifting, the piston body 30 can be lifted up by the action of the clamping member on the piston body 30 so that it is separated from the placement surface.

[0035] The movable frame 16 is slidably connected to the sliding opening opened on the support frame 11 by a slider, and the slider is connected to the inner wall of one side of the sliding opening by a tension spring 17, which is used to drive the movable frame 16 to reset in the future. A guide wheel group is provided for rotating at the outer end of the inner cavity of the sliding opening. The guide wheel group includes an axle body and a guide wheel, and a pull rope 18 is wound around the outer side of the guide wheel group. One end of the pull rope 18 is connected to the movable frame 16 toward the inner wall of one side of the calibration cylinder 1, and the other end movably passes through the support frame 11 and is connected to the movable seat 4. The outer end of the top of the movable frame 16 is rotatably provided with a roller 19 that slides in contact with the inner wall of the positioning arm 12. Through this arrangement, when the movable seat 4 moves upward, the movable frame 16 is pulled outward by the pull rope 18, and then the movable frame 16 pushes the positioning arm 12 through the roller 19, causing the positioning arm 12 to flip, thereby clamping the positioning block 13 into the piston ring groove, so that the support plate 14 contacts the bottom of the piston body 30.

[0036] Example 2

[0037] Please see the attached Figure 3-4, as a preference, the lifting ring portion of this embodiment includes a hollow seat 21 provided on the movable seat 4, and a lifting ring 22 is movably inserted on the top of the hollow seat 21 for connecting with the hook of an external lifting device. A contact plate is provided at the bottom of the lifting ring 22, and a return spring 23 is provided between the contact plate and the inner wall of the hollow seat 21. A detection device 24 is provided in close contact with the bottom of the contact plate. The detection device 24 is, for example, a pressure sensor or a contact sensor, and its model is not described in detail here. When the external lifting equipment lifts, under the gravity of the piston body 30, the lifting ring 22 will drive the contact plate to squeeze the return spring 23 and disengage from the detection device 24. If the hook is damaged or the rope connecting the hook is broken during lifting, the return spring 23 will drive the contact plate to reset and squeeze the detection device 24;

[0038] The detection device 24 is provided on the gas generator 25, and the gas generator 25 belongs to the prior art, for example, including a housing and compressed gas placed in the housing;

[0039] The output end of the gas generator 25 is connected to a plurality of connecting pipes 26 via a shunt pipe. The plurality of connecting pipes 26 pass through the side wall of the hollow seat 21 and the corresponding positioning arm 12 and are connected to an inflatable airbag buffer 27 provided at the bottom of the positioning arm 12. The inflatable airbag buffer belongs to the prior art and will not be described in detail here. A solenoid valve controlled by a detection device 24 is provided in the shunt pipe.

[0040] An electrical device 3 is provided in the movable seat 4, which includes a power supply device, a wireless device and a controller. After receiving a signal of contact with the contact plate, the detection device 24 drives the solenoid valve to open, so that the gas in the gas generator 25 enters the inflatable airbag buffer 27 through the connecting pipe 26.

[0041] It should be noted that during lifting, the user can send a signal to the controller via a wireless device to indicate that the detection device 24 is working. When the lifting is completed and the piston body 30 is placed in the desired position, the user needs to send a signal to the controller via the wireless device to indicate that the detection device 24 is off. In this way, when the piston body 30 is normally lifted and placed in the desired position, the gas generator 25 will not input gas to the inflatable airbag buffer 27. After the inflatable airbag buffer 27 is inflated, its bottom end is below the piston body 30, that is, the inflatable airbag buffer 27 first contacts the ground after expansion.

[0042] As a preferred embodiment, the positioning arm 12 of this embodiment is provided with a movable opening, and a connecting block 28 is fixedly provided at one end of the movable opening. The connecting block 28 is fixedly sleeved on the outer wall of the rotating shaft. The rotating shaft is rotatably arranged at the outer end of the support frame 11 and is connected to the support frame 11 through a torsion spring. The torsion spring is used to drive the rotating shaft so that the connecting block 28 drives the rotating positioning arm 12 to return to its initial state (as shown in the attached figure). Figure 1), a damping shock absorber 29 is also provided between the connecting block 28 and the inner wall of the other end of the movable opening. The damping shock absorber 29 belongs to the prior art and will not be described in detail here. When the hook is damaged or the rope connecting the hook is broken during lifting, on the one hand, the inflatable airbag buffer 27 will be inflated, and on the other hand, due to the lack of pulling force of the lifting equipment, the movable seat 4 will be reset under the action of the elastic member, the movable frame 16 will be reset under the action of the tension spring 17, and the positioning arm 12 will be reset under the action of the torsion spring. The positioning arm 12 opens outward to increase the contact area with the contact surface after landing. On the other hand, after landing and contacting the contact surface, the impact force received can not only be absorbed by the inflatable airbag buffer 27, but also transmitted to the damping shock absorber 29 through the positioning arm 12 and absorbed by the damping shock absorber 29, effectively avoiding damage to the piston body 30 caused by the piston body 30 falling due to damage to the hook or the breakage of the rope connecting the hook.

[0043] Preferably, casters 20 are provided at the bottom of the support plate 14 of this embodiment, and the bottom end of the casters 20 is located below the bottom of the unexpanded inflatable airbag buffer 27. When the piston body 30 is placed in the desired position, the casters 20 are first used to contact the placement ground to prevent the piston body 30 from falling to the ground and causing collision damage. At the same time, the piston body 30 can also be moved and adjusted to its placement position by the casters 20. Then, the hook of the lifting device is separated from the lifting ring 22. At this time, in the absence of tension, the movable seat 4 is reset under the action of the elastic member, the movable frame 16 is reset under the action of the tension spring 17, and the positioning arm 12 is reset under the action of the torsion spring. Then, the rotating device 5 is driven to separate the clamping member from the piston body 30, thereby separating the lifting device from the piston body 30.

[0044] A method for using a self-aligning lifting device for a marine diesel engine piston, utilizing the aforementioned lifting device, is characterized in that it comprises the following steps:

[0045] S1: Connect an external lifting device to the lifting ring part, and use the lifting device to move the lifting device to the piston body 30 to be lifted, so that the calibration cylinder 1 enters the piston body 30 and contacts the inner wall of the piston body 30 through the clamping member. After the clamping member contacts the inner wall of the piston body 30, the calibration cylinder 1 is in the center of the piston body 30;

[0046] S2: Lift the lifting device with the lifting equipment. Under the action of the clamping parts, the piston body 30 leaves the placement area. Under the gravity of the piston body 30, the movable seat 4 moves relative to the calibration cylinder 1, and then drives the positioning arm 12 to flip through the linkage part, so that the positioning block 13 is automatically aligned and inserted into the piston groove on the outer wall of the piston body 30, and the support plate 14 contacts the bottom of the piston body 30. Finally, control the lifting equipment to transfer the piston body 30 to the desired position.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A self-aligning lifting device for a marine diesel engine piston, used for lifting a piston body (30), characterized in that: The lifting device comprises a calibration positioning portion located in a piston body (30) and an alignment clamping portion provided on an outer wall of the calibration positioning portion; The calibration positioning portion comprises a calibration cylinder (1) located in the piston body (30), a clamping member provided on the outer wall of the calibration cylinder (1), and a movable seat (4) movably provided on the calibration cylinder (1) via a T-shaped rod (15) and an elastic member, wherein the clamping member is used to contact the inner wall of the piston body (30) to drive the calibration cylinder (1) to the center of the piston body (30), and the movable seat (4) is used to move relative to the calibration cylinder (1) during hoisting, and a lifting ring portion is provided on the movable seat (4); The alignment-type engaging portion comprises a plurality of support frames (11) arranged in a ring array on the calibration cylinder (1), the support frames (11) being located above the piston body (30), the outer end rotation axis of the support frame (11) being connected to a positioning arm (12), the positioning arm (12) being provided with a positioning block (13), the bottom end of the positioning arm (12) being integrally provided with a support plate (14), the support frame (11) being provided with a linkage member connected to the movable seat (4), the linkage member driving the positioning arm (12) to flip when the movable seat (4) moves upward, so that the positioning block (13) is stuck in the piston ring groove on the outer wall of the piston body (30), and the support plate (14) is in contact with the bottom of the piston body (30); The clamping member comprises a telescopic rod (2) arranged at the axis of the calibration cylinder (1), one end of the telescopic rod (2) is rotatably connected to the inner wall of the bottom of the calibration cylinder (1), and the other end extends into the movable seat (4) and is connected to the output end of the rotating device (5) arranged in the movable seat (4); the outer wall of the telescopic rod (2) in the calibration cylinder (1) is sleeved with a gear member (6), the circumferential outer wall of the calibration cylinder (1) is inserted with multiple groups of threaded sleeves (7), the connection between the threaded sleeve (7) and the calibration cylinder (1) is provided with a bearing, the inner end of the threaded sleeve (7) is sleeved with a driven gear (10) meshing with the gear member (6), the outer end of the threaded sleeve (7) is threadedly inserted with a threaded rod (8), the outer end of the threaded rod (8) is connected to an arc block (9) for fitting with the inner wall of the piston body (30), the inner end of the arc block (9) is connected to a T-shaped guide rod, and the T-shaped guide rod movably passes through the calibration cylinder (1); The linkage member includes a movable frame (16) arranged on the support frame (11), the movable frame (16) is slidably connected with a sliding opening opened on the support frame (11) through a slider, the slider is connected to the inner wall of one side of the sliding opening through a tension spring (17), a guide wheel group is rotatably provided at the outer end of the inner cavity of the sliding opening, a pull rope (18) is wound around the outer side of the guide wheel group, one end of the pull rope (18) is connected to the inner wall of one side of the movable frame (16) facing the calibration cylinder (1), and the other end is movable through the support frame (11) and connected to the movable seat (4), and a roller (19) is rotatably provided at the outer end of the top of the movable frame (16) and is in sliding contact with the inner wall of the positioning arm (12).

2. The hoisting device according to claim 1, characterized in that: The hanging ring portion includes a hollow seat (21) arranged on a movable seat (4), a hanging ring (22) is movably inserted on the top of the hollow seat (21), a contact plate is provided at the bottom of the hanging ring (22), a return spring (23) is provided between the contact plate and the inner wall of the hollow seat (21), a detection device (24) is provided at the bottom of the contact plate, and the detection device (24) is provided on the gas generator (25), and the output end of the gas generator (25) is connected to multiple groups of connecting pipes (26) through a shunt pipe, and the multiple groups of connecting pipes (26) all pass through the side wall of the hollow seat (21) and the corresponding positioning arm (12) and are connected to the inflatable airbag buffer (27) provided at the bottom of the positioning arm (12), and a solenoid valve controlled by the detection device (24) is provided in the shunt pipe; An electrical device (3) is provided in the movable seat (4), and the electrical device (3) includes a power supply device, a wireless device, and a controller. After receiving a signal of contact with the contact plate, the detection device (24) drives the electromagnetic valve to open, so that the gas in the gas generator (25) enters the inflatable airbag buffer (27) through the connecting pipe (26).

3. The hoisting device according to claim 2, characterized in that: A movable opening is provided through the positioning arm (12), a connecting block (28) is fixedly provided at one end of the movable opening, the connecting block (28) is fixedly sleeved on the outer wall of the rotating shaft, the rotating shaft is rotatably provided at the outer end of the support frame (11) and is connected to the support frame (11) through a torsion spring, and a damping shock absorber (29) is further provided between the connecting block (28) and the inner wall of the other end of the movable opening.

4. The hoisting device according to claim 3, characterized in that: A caster (20) is provided at the bottom of the support plate (14), and the bottom end of the caster (20) is located below the bottom of the unexpanded inflatable airbag buffer (27).

5. The hoisting device according to claim 1, characterized in that: The outer wall of the arc block (9) is provided with an arc rubber pad, and the outer side wall of the arc rubber pad is provided with anti-slip grooves.

6. A method for using a self-aligning lifting device for a marine diesel engine piston, using the lifting device according to claim 1, characterized in that: The following steps are involved: S1: Connect an external lifting device to the lifting ring part, and move the lifting device to the piston body (30) to be lifted by the lifting device, so that the calibration cylinder (1) enters the piston body (30) and contacts the inner wall of the piston body (30) through the clamping member. After the clamping member contacts the inner wall of the piston body (30), the calibration cylinder (1) is located in the center of the piston body (30); S2: The lifting device is lifted by the lifting equipment. Under the action of the clamping member, the piston body (30) leaves the placement area. Under the gravity of the piston body (30), the movable seat (4) moves relative to the calibration cylinder (1), and then the positioning arm (12) is driven to flip through the linkage member, so that the positioning block (13) is automatically aligned and inserted into the piston groove on the outer wall of the piston body (30), and the support plate (14) contacts the bottom of the piston body (30). Finally, the lifting equipment is controlled to transfer the piston body (30) to the desired position.

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