Marine cylinder head expander

Abstract

The application relates to the technical field of stretchers, and particularly discloses a marine cylinder cover stretcher which comprises a plurality of cavity housings and fixedly connected screwing housings, the cavity housings are located above the screwing housings, a hydraulic frame is slidably arranged in the cavity housings, studs are threadedly connected to the hydraulic frame and can vertically slide along with the hydraulic frame, a tooth ring is arranged above the cavity housings, can rotate relative to the cavity housings and drives the plurality of studs to rotate along the axis of the cavity housings, a transmission ring is arranged in the screwing housings and can vertically slide relative to the screwing housings, a screw sleeve capable of being threadedly connected with the outer periphery of the stud is fixedly connected to the top of the transmission ring, after the stud is threadedly connected with the screw sleeve in the downward rotating direction, the transmission ring can slide along with the hydraulic frame, the marine cylinder cover stretcher integrates the two key procedures of stretching and locking into synchronous actions, greatly shortens the time consumption of single operation and effectively improves the equipment utilization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stretchers, in particular to a marine cylinder cover stretcher. BACKGROUND

[0002] In the maintenance and assembly operation of the ship power system, the cylinder cover as the core sealing component, the connection reliability of the cylinder cover and the cylinder body directly determines the engine operation safety and efficiency. The cylinder cover is fixed by multiple groups of high-strength connecting bolts. During assembly, the bolts need to be accurately stretched to eliminate the thread gap, and at the same time ensure that the nut locking torque is uniform, so as to avoid high-temperature gas leakage, cylinder body wear and other faults caused by local sealing.

[0003] However, the traditional equipment and process used in the current marine cylinder cover stretching operation have technical bottlenecks in the bolt stretching and nut tightening operation links of the same type of cylinder cover in the face of large quantities of orders.

[0004] The existing stretchers generally adopt a step-by-step operation mode of stretching first and then tightening. First, the connecting bolts are stretched one by one through a hydraulic driving mechanism, and then the nuts are tightened by inserting a rod into the nut screwing window. This process has some problems. On the one hand, the step-by-step operation leads to a long single operation cycle, and in the batch assembly scene of marine cylinder cover, the equipment utilization rate is low, and the production efficiency is difficult to meet the delivery demand. On the other hand, when the nut tightening link is manually intervened, the torque control accuracy depends on the experience of the operator, and torque deviation is easy to occur. When the bolt torque is uneven, the sealing surface of the cylinder cover is unbalanced, the sealing gasket is easily deformed, and the cylinder gas leakage risk is caused. SUMMARY

[0005] The present application provides a marine cylinder cover stretcher, which aims to solve the problem of long single operation cycle caused by the need for stretching first and then tightening of the stretcher in related technology, and the problem of torque deviation caused by manual intervention in the nut tightening link.

[0006] The marine cylinder cover stretcher of the present application comprises a plurality of cavity housings and a screwing housing fixedly connected thereto. The cavity housings are located above the screwing housing. A hydraulic frame is slidably assembled inside the cavity housing and can vertically slide relative to the cavity housing. A stud is threadedly connected to the hydraulic frame and can vertically slide with the hydraulic frame;

[0007] A gear ring is provided above the cavity housing and can rotate relative to the cavity housing and drive multiple studs to rotate along the axis of the cavity housing;

[0008] A transmission ring is provided inside the screwing housing and can vertically slide relative to the screwing housing. A screw sleeve capable of threadedly connecting with the stud is fixedly connected to the top of the transmission ring. After the stud is screwed downward with the screw sleeve, the transmission ring can slide with the hydraulic frame.

[0009] The inner part of the transmission ring is provided with a nest which is rotationally assembled on the inner wall of the screwing shell and can rotate with the lifting of the transmission ring;

[0010] The transmission ring is provided with an inclined plate which can be lifted with the transmission ring and drive the nest to rotate in the lifting process.

[0011] Preferably, the inner part of the cavity shell is provided with a hydraulic chamber, and a hydraulic frame is slidingly assembled in the hydraulic chamber. The inner part of the cavity shell is also provided with a guide groove for limiting the sliding direction of the transmission ring.

[0012] Preferably, the outer side of the transmission ring is provided with an inclined groove, the lower end of the inclined groove is provided with a tightening groove, the inclined plate is slidingly connected in the tightening groove, the transmission ring is also fixedly connected with a guide block, and the guide block is slidingly connected in the guide groove.

[0013] Preferably, the outer part of the nest is fixedly connected with a sliding column, and the sliding column is slidingly connected on the inclined groove and the inclined plate. When the inclined groove and the inclined plate are lifted with the transmission ring, the sliding of the sliding column in the inclined groove can drive the nest to rotate.

[0014] Preferably, the top of the inclined plate away from the inclined groove is fixedly connected with a baffle, and the inclined plate and the tightening groove are provided with a spring sheet.

[0015] Preferably, the lower part of the tooth ring is provided with a cylinder body, the inner part of the cylinder body is provided with a gas rod, the top of the cylinder body is provided with a connecting bolt corresponding to the cavity shell, the connecting bolt can be screwed with the inner side of the stud, the upper part of the cylinder body is provided with a cylinder cover body, the top of the cylinder cover body is provided with a plurality of nuts screwed with the connecting bolt, the nuts are matched with the nest, and the cylinder cover body is fixedly connected to the top of the cylinder body through the cooperation of the connecting bolt and the nut.

[0016] Preferably, the outer side of the cylinder body is provided with an outer frame, the outer side of the outer frame is fixedly connected with an upper fixed ring and a lower fixed ring, the tooth ring is rotationally assembled on the inner side of the upper fixed ring, and the top of the outer frame is fixedly connected with a handle.

[0017] Preferably, the top of the outer frame is fixedly installed with a motor, the driving end of the motor is fixedly connected with a gear two which is engaged with the tooth ring, the top of the stud is fixedly connected with a gear three which is engaged with the tooth ring.

[0018] Preferably, the inner wall of the lower fixed ring is rotationally installed with a gear ring, the outer side of the gear ring is fixedly connected with a rotating ring, a plurality of lead screws are penetratingly arranged on the lower fixed ring, the end of the lead screw close to the cylinder body is provided with a clamping sheet, the outer part of the lead screw is threadedly connected with a gear one which is rotationally installed on the lower fixed ring and engaged with the gear ring.

[0019] Preferably, the outer sleeve of the air rod is provided with a hydraulic ring I and a hydraulic ring II, the hydraulic ring I and the hydraulic ring II are fixedly installed on the outer frame, the hydraulic ring I is provided with an oil inlet I and a plurality of oil inlets II corresponding to the cavity shell, and the plurality of oil inlets II are respectively connected with the plurality of hydraulic cavities, and the hydraulic ring II is provided with an oil outlet I and a plurality of oil outlets II corresponding to the cavity shell, and the plurality of oil outlets II are respectively connected with the plurality of hydraulic cavities.

[0020] The beneficial effects of the present application are:

[0021] Firstly, the device can stretch the connecting bolts while lifting the transmission ring, the nested part and the nut synchronously, so that the nut locking is realized by the cooperation of the inclined groove and the tightening assembly, the two key processes of "stretching" and "locking" are combined into synchronous action, the time consumption of single operation is greatly shortened, the equipment utilization is effectively improved, and the delivery demand of the marine cylinder cover batch assembly scene is better adapted. The inclined angle of the inclined groove and the inclined design of the inclined plate of the tightening assembly ensure that the rotation angle and the tightening force of the nut are controllable, the random error of manual operation is avoided, the torque of each connecting bolt is uniform, and the sealing reliability of the cylinder cover and the cylinder body is significantly improved.

[0022] Secondly, the device realizes automatic nut tightening through the tightening assembly, and the elastic sheet can be automatically retracted according to the tightening degree, so that the part damage is avoided, the uncertainty of manual operation is fundamentally eliminated, the sealing reliability of the cylinder cover and the cylinder body is ensured, and the failure rate of leakage and bolt damage is significantly reduced.

[0023] Thirdly, the multiple stretching mechanisms act synchronously to ensure that all the hydraulic frames are lifted synchronously, and the synchronous stretching and locking of multiple connecting bolts are realized. This synchronous action design ensures that the stretching amount and locking torque of each bolt are highly consistent, the cylinder cover sealing surface is uniformly stressed, and the assembly precision and stability are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the present application.

[0025] Figure 2 It is a structural schematic diagram of the cylinder body of the present application.

[0026] Figure 3 It is a structural schematic diagram of the outer frame of the present application.

[0027] Figure 4 It is a front view and sectional view schematic diagram of the outer frame of the present application.

[0028] Figure 5 It is a structural schematic diagram of the hydraulic assembly of the present application.

[0029] Figure 6is a structural schematic diagram of the screwing assembly of the present application.

[0030] Figure 7 is a structural schematic diagram of the clamping assembly of the present application.

[0031] Figure 8 is a structural schematic diagram of the stretcher housing and internal components of the present application.

[0032] Figure 9 is a front view sectional schematic diagram of the stretcher housing and internal components of the present application.

[0033] Figure 10 is a structural schematic diagram of the stretcher housing of the present application.

[0034] Figure 11 is a perspective sectional schematic diagram of the stretcher housing and stud of the present application.

[0035] Figure 12 is a structural schematic diagram of the transmission ring of the present application.

[0036] Figure 13 is a structural schematic diagram of the screwing assembly of the present application.

[0037] Figure 14 is a structural schematic diagram of the nest of the present application.

[0038] Reference signs:

[0039] 10, cylinder body; 101, air rod; 102, connecting bolt; 11, cylinder cover body; 12, nut; 20, outer frame; 21, upper fixed ring; 22, lower fixed ring; 23, handle; 24, clamping assembly; 241, gear ring; 2411, rotating ring; 242, screw rod; 243, clamping piece; 2431, guide rod; 244, gear one; 30, hydraulic assembly; 301, hydraulic ring one; 3011, oil inlet one; 3012, oil inlet two; 302, hydraulic ring two; 3021, oil outlet one; 3022, oil outlet two; 40, screwing assembly; 401, motor; 402, gear two; 403, gear ring; 404, gear three; 50, stretching mechanism; 501, cavity housing; 5011, hydraulic cavity; 5012, guide groove; 502, screwing housing; 51, stud; 52, hydraulic frame; 53, transmission ring; 531, screw sleeve; 532, guide block; 533, inclined groove; 534, screwing groove; 535, screwing assembly; 5351, inclined plate; 5352, baffle; 5353, elastic sheet; 54, nest; 541, sliding column. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the examples of embodiments are illustrated in the drawings. The embodiments described below are exemplary and intended to explain the present application, and are not to be understood as limiting the present application.

[0041] As shown in Figures 1 to 14 , the marine cylinder cover stretcher of the present application comprises a cylinder body 10, connecting bolts 102, a cylinder cover body 11, an outer frame 20, a hydraulic assembly 30, a screwing assembly 40, a stretching mechanism 50 and a tightening assembly 535, the top of the cylinder body 10 is provided with a plurality of connecting bolts 102, the cylinder cover body 11 can be fixedly connected to the top of the cylinder body 10 through the connecting bolts 102, the outer frame 20 is arranged outside the cylinder body 10 and the cylinder cover body 11, the stretching mechanism 50 is arranged in a plurality of and corresponds to the connecting bolts 102 and is fixedly installed on the outer frame 20, the stretching mechanism 50 can make the cylinder cover body 11 further fit on the surface of the cylinder body 10 by stretching the connecting bolts 102, the hydraulic assembly 30 is arranged on the outer frame 20 and can input hydraulic oil to the stretching mechanism 50 to stretch the connecting bolts 102, the screwing assembly 40 is arranged on the outer frame 20 and can install the stretching mechanism 50 on the connecting bolts 102, the tightening assembly 535 is arranged inside the stretching mechanism 50 and can tighten the connecting bolts 102 when the hydraulic assembly 30 inputs hydraulic oil to the stretching mechanism 50 to stretch the connecting bolts 102.

[0042] As shown in Figure 1 and Figure 2 , the cylinder body 10 is internally provided with a gas rod 101 capable of positioning the hydraulic assembly 30, the connecting bolts 102 are threadedly connected with nuts 12, and the nuts 12 are located above the cylinder cover body 11, capable of tightening the connecting bolts 102 to make the cylinder cover body 11 fit on the surface of the cylinder body 10, ensuring the sealing between the cylinder body 10 and the cylinder cover body 11.

[0043] As shown in Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 7 , the outer frame 20 is fixedly connected with an upper fixed ring 21 and a lower fixed ring 22 outside, capable of forming a surrounding support structure, and the upper fixed ring 21 is located above the lower fixed ring 22, the top of the outer frame 20 is fixedly connected with a handle 23, facilitating the carrying and installation of the entire device, and the lower fixed ring 22 is further provided with a clamping assembly 24, capable of fixing the outer frame 20 to the outer periphery of the cylinder body 10, preventing the device from deviating during operation.

[0044] The clamping assembly 24 comprises a gear ring 241, a lead screw 242, a clamping sheet 243 and a gear one 244, the gear ring 241 is rotationally installed on the inner side wall of the lower fixed ring 22, the outer side of the gear ring 241 is fixedly connected with a rotating ring 2411, facilitating the rotation of the gear ring 241, the lead screw 242 is provided with a plurality of lead screws 242 along the radial direction of the lower fixed ring 22, and the lead screw 242 penetrates the lower fixed ring 22 and is fixedly connected with the clamping sheet 243, the gear one 244 is threadedly connected to the lead screw 242 and rotationally installed on the inner side of the lower fixed ring 22, the gear one 244 is engaged with the gear ring 241, the clamping sheet 243 is fixedly connected with a guide rod 2431 on the side close to the lower fixed ring 22, for limiting the movement direction of the clamping sheet 243, when the rotating ring 2411 is rotated, under the meshing action of the gear one 244 and the gear ring 241, the gear one 244 is rotated to drive the lead screw 242 and the clamping sheet 243 to slide along the radial direction of the lower fixed ring 22, so that the outer frame 20 is clamped and fixed on the outer side of the cylinder body 10.

[0045] As shown in Figure 1 and Figure 5 The hydraulic assembly 30 comprises a hydraulic ring one 301 and a hydraulic ring two 302, the hydraulic ring one 301 and the hydraulic ring two 302 are both fixedly installed on the outer frame 20 and are sleeved on the air rod 101, the hydraulic ring one 301 is provided with an oil inlet one 3011 and a plurality of oil inlets two 3012, the hydraulic ring two 302 is provided with an oil outlet one 3021 and a plurality of oil outlets two 3022, the hydraulic ring one 301 and the hydraulic ring two 302 are respectively communicated with the stretching mechanism 50 through oil pipes, hydraulic oil enters the hydraulic ring one 301 through the oil inlet one 3011, then enters the corresponding stretching mechanism 50 through the oil inlet two 3012, and the hydraulic oil can enter the hydraulic ring two 302 through the oil outlet two 3022, then the hydraulic oil is sent out of the device through the oil outlet one 3021, so as to provide the stretching mechanism 50 with hydraulic oil of different pressures, thereby realizing different stretching effects.

[0046] As shown in Figure 6 The screwing assembly 40 comprises a motor 401, a gear two 402, a gear ring 403 and a gear three 404, the motor 401 is fixedly installed on the top of the outer frame 20 and is located above the stretching mechanism 50, the gear two 402 is fixedly sleeved on the output shaft of the motor 401, the gear ring 403 is rotationally installed on the inner side of the upper fixed ring 21, the gear three 404 is provided with a plurality of gears three 404 and is respectively located on the corresponding stretching mechanism 50, and the gear three 404 is engaged with the gear ring 403, the gear ring 403 is engaged with the gear two 402 at the same time, the motor 401 drives the gear two 402 to rotate, and drives the gear three 404 to rotate through the gear ring 403, so as to make the plurality of stretching mechanisms 50 simultaneously screw with the connecting bolts 102.

[0047] As shown in Figures 8 to 14As shown, the stretching mechanism 50 comprises a cavity shell 501, a screw shell 502, a stud 51, a hydraulic frame 52, a transmission ring 53 and a nest 54, the cavity shell 501 is fixedly connected with the screw shell 502, and the cavity shell 501 is located above the screw shell 502, the stud 51 is arranged on the inner side of the cavity shell 501, the hydraulic frame 52 is slidingly assembled on the cavity shell 501, and the transmission ring 53 and the nest 54 are located on the inner side of the screw shell 502.

[0048] The cavity shell 501 is internally provided with a hydraulic cavity 5011, the hydraulic cavity 5011 can be in communication with the hydraulic ring one 301 and the hydraulic ring two 302, and the hydraulic frame 52 is located on the inner side of the hydraulic cavity 5011, when hydraulic oil is introduced into the hydraulic cavity 5011, the hydraulic frame 52 rises, and vice versa.

[0049] The outer side of the stud 51 is threadedly connected with the hydraulic frame 52, the inner side of the stud 51 can be threadedly connected with the connecting bolt 102, and the gear three 404 is fixedly connected to the top end of the stud 51, when the gear three 404 rotates, the stud 51 rotates, and is slid to the connecting bolt 102 and is threadedly connected with the connecting bolt 102 through the thread cooperation with the hydraulic frame 52, the hydraulic frame 52 rising or falling can drive the stud 51 to rise, and the connecting bolt 102 is stretched, the gear three 404 vertically slides relative to the gear ring 403, and is still engaged with the gear ring 403.

[0050] The cavity shell 501 is internally provided with a guide groove 5012, the transmission ring 53 is fixedly connected with a guide block 532 on the outer periphery of the top, the guide block 532 is matched with the guide groove 5012, so that the transmission ring 53 can vertically slide relative to the screw shell 502 through the cooperation of the guide groove 5012 and the guide block 532.

[0051] The transmission ring 53 is sleeved on the outer side of the connecting bolt 102, and the top of the transmission ring 53 is fixedly connected with a threaded sleeve 531, when the stud 51 slides downward, the inner side thereof is threadedly connected with the connecting bolt 102, and the outer side can be threadedly connected with the threaded sleeve 531, so that when the hydraulic frame 52 rises, the transmission ring 53 can be lifted at the same time.

[0052] The nest 54 is movably assembled in the transmission ring 53, and the nest 54 is matched with the nut 12, the nest 54 is externally fixedly connected with a plurality of sliding columns 541, when the nest 54 rotates, the nut 12 can be driven to rotate to tighten the connecting bolt 102, so that the cylinder cover body 11 and the cylinder body 10 are more closely combined.

[0053] The surface of the transmission ring 53 is provided with an inclined groove 533, and the bottom end of the inclined groove 533 is provided with a tightening groove 534. The slide column 541 is slidingly connected in the inclined groove 533. When the transmission ring 53 slides upward, the guide block 532 ensures that the transmission ring 53 does not rotate by itself, so that the slide column 541 slides in the inclined groove 533 and drives the nesting 54 to rotate, and then drives the nut 12 to rotate. The inside of the tightening groove 534 is provided with a tightening assembly 535, which can finally tighten the nut 12 on the connecting bolt 102.

[0054] The tightening assembly 535 includes an inclined plate 5351, a baffle 5352, and an elastic sheet 5353. The inclined plate 5351 is slidingly connected in the tightening groove 534. The baffle 5352 is fixedly connected to the top of the inclined plate 5351 and away from the inclined groove 533. The elastic sheet 5353 is arranged between the inclined plate 5351 and the tightening groove 534. The top of the inclined plate 5351 is provided with an inclined slope, and the inclination angle is greater than that of the inclined groove 533. When the slide column 541 slides to the inclined slope, the transmission ring 53 lifts the same stroke, and the slide column 541 slides a longer distance in the inclined groove 533, so that the rotation angle of the nesting 54 and the nut 12 is larger, and the tightening effect is achieved. The baffle 5352 can prevent the slide column 541 from passing over the inclined plate 5351, and the elastic sheet 5353 can be contracted according to the tightening degree to prevent the slide column 541 from breaking.

[0055] It should be noted that after the hydraulic oil is introduced into the hydraulic cavity 5011, when the hydraulic frame 52 lifts the stud 51 to stretch the connecting bolt 102, the transmission ring 53 will be lifted synchronously according to the length of the stud 51 stretching, so that the nesting 54 and the nut 12 rotate, and through the inclination angle of the inclined plate 5351 at the end of the inclined groove 533, the nut 12 is finally locked.

[0056] When the device is removed from the cylinder body 10, first rotate the stud 51 to make it separate from the screw sleeve 531 on the top of the transmission ring 53, and still be screwed with the connecting bolt 102. Then lower the hydraulic frame 52 to make the connecting bolt 102 retract. Then rotate the stud 51 again to separate it from the connecting bolt 102. At this time, the stretching mechanism 50 can be removed from the connecting bolt 102.

[0057] Working principle:

[0058] The outer frame 20 is sleeved outside the cylinder body 10 and the cylinder cover body 11. The rotating ring 2411 is rotated to drive the gear ring 241 to rotate, and the gear one 244 is rotated to drive the threaded connection with the lead screw 242 to slide along the lower fixed ring 22 radially. The lead screw 242 drives the clamping piece 243 to move synchronously, and the guide rod 2431 limits the movement direction of the clamping piece 243. Finally, the outer frame 20 is firmly clamped on the outer periphery of the cylinder body 10 to avoid deviation of the device during operation.

[0059] The starting motor 401 drives the gear two 402 to rotate, the gear two 402 drives the gear ring 403 to rotate, the gear ring 403 drives the plurality of gear three 404 to rotate synchronously, so the stud 51 rotates with the gear three 404, and simultaneously slips to the connecting bolt 102 on the cylinder cover body 11 by the cooperation of the threads, and finally forms the thread connection with the connecting bolt 102, and the stretching mechanism 50 is connected with the connecting bolt 102.

[0060] The hydraulic oil enters from the oil inlet one 3011 of the hydraulic ring one 301, and is respectively introduced into the hydraulic cavity 5011 corresponding to the stretching mechanism 50 through the plurality of oil inlets two 3012, the hydraulic oil pressure in the hydraulic cavity 5011 is increased, the slidingly assembled hydraulic frame 52 is driven to move upward, the hydraulic frame 52 drives the stud 51 in threaded connection therewith to ascend synchronously, the stud 51 is connected with the connecting bolt 102, and then generates an upward tension on the connecting bolt 102, so that the stretching of the connecting bolt 102 is realized.

[0061] When the hydraulic frame 52 drives the stud 51 to lift, the stud 51 is in threaded connection with the screw sleeve 531 on the top of the transmission ring 53, the transmission ring 53 is lifted synchronously with the stud 51, the guide block 532 on the outer periphery of the transmission ring 53 slides in the guide groove 5012 of the cavity shell 501, the transmission ring 53 is limited to rotate, the slide column 541 on the nested sleeve 54 in the transmission ring 53 slides in the inclined groove 533 of the transmission ring 53, the slide column 541 drives the nested sleeve 54 to rotate, thereby driving the nut 12 to rotate, when the slide column 541 slides into the tightening groove 534 at the end of the inclined groove 533 and contacts the inclined plate 5351, the inclined angle of the inclined slope on the top of the inclined plate 5351 is greater than that of the inclined groove 533, when the slide column 541 slides along the inclined slope, the rotation angle of the nested sleeve 54 is increased, the final tightening of the nut 12 is realized, and the cylinder cover body 11 is tightly attached to the surface of the cylinder body 10.

[0062] The rotation of the stud 51 is controlled, so that the stud 51 is disconnected from the screw sleeve 531 of the transmission ring 53, at this time, the stud 51 is still in threaded connection with the connecting bolt 102, then the hydraulic frame 52 is lowered, so that the connecting bolt 102 is completely retracted, finally the rotation of the stud 51 is controlled again, so that the stud 51 is disconnected from the threaded connection with the connecting bolt 102, the stretching mechanism 50 can be removed from the connecting bolt 102, and then the whole outer frame 20 can be detached from the cylinder body 10, and the work process is completed.

[0063] When the connecting bolt 102 needs to be detached, the transmission ring 53 with the opposite direction inclined groove 533 can be replaced.

[0064] Although the embodiments of the present application have been shown and described above, it should be understood by those skilled in the art that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A marine cylinder head expander comprising a plurality of cavity shells (501) and a screwing shell (502) fixedly connected therewith, the cavity shells (501) being located above the screwing shell (502), characterized in that, The hydraulic frame (52) is slidably arranged inside the cavity shell (501) and can vertically slide relative to the cavity shell (501), and the stud (51) is threadedly connected to the hydraulic frame (52) and can vertically slide with the hydraulic frame (52); The cavity shell (501) is provided with a gear ring (403) above the cavity shell (501), which can rotate relative to the cavity shell (501) and drive the plurality of studs (51) to rotate along the axis of the cavity shell (501); The inside of the screw shell (502) is provided with a transmission ring (53), which can vertically slide relative to the screw shell (502), and the top of the transmission ring (53) is fixedly connected with a sleeve (531) which can be threadedly connected with the outer periphery of the stud (51), and after the stud (51) is screwed downward with the sleeve (531), the transmission ring (53) can slide with the hydraulic frame (52); The inside of the transmission ring (53) is provided with a nest (54), the nest (54) is rotatably arranged on the inner wall of the screw shell (502), the outer side of the transmission ring (53) is provided with an inclined groove (533), and the nest (54) can rotate with the lifting of the transmission ring (53) and the cooperation of the inclined groove (533); The lower end of the inclined groove (533) is provided with a tightening groove (534), the tightening groove (534) is slidably connected with an inclined plate (5351), the inclined plate (5351) can be lifted with the transmission ring (53), and in the lifting process, the inclined plate (5351) cooperates with the tightening groove (534) to drive the nest (54) to rotate.

2. Marine cylinder head expander according to claim 1, characterized in that The inside of the cavity shell (501) is provided with a hydraulic cavity (5011), the hydraulic frame (52) is slidably arranged inside the hydraulic cavity (5011), and the inside of the cavity shell (501) is further provided with a guide groove (5012) for limiting the sliding direction of the transmission ring (53).

3. Marine cylinder head expander according to claim 2, characterized in that The transmission ring (53) is further fixedly connected with a guide block (532), and the guide block (532) is slidably connected in the guide groove (5012).

4. The marine cylinder head expander of claim 3, wherein, The outside of the nest (54) is fixedly connected with a slide column (541), and the slide column (541) is slidably connected on the inclined groove (533) and the inclined plate (5351), when the inclined groove (533) and the inclined plate (5351) are lifted with the transmission ring (53), the slide column (541) slides in the inclined groove (533) to drive the nest (54) to rotate.

5. The marine cylinder head expander of claim 4, wherein, The top of the inclined plate (5351) away from the inclined groove (533) is fixedly connected with a baffle (5352), and the inclined plate (5351) and the tightening groove (534) are provided with a spring sheet (5353).

6. The marine cylinder head tensioner of claim 2, wherein, The lower part of the gear ring (403) is provided with a cylinder body (10), the inside of the cylinder body (10) is provided with a gas rod (101), and the top of the cylinder body (10) is provided with a connecting bolt (102) corresponding to the cavity shell (501), the connecting bolt (102) can be screwed with the inside of the stud (51), and the upper part of the cylinder body (10) is provided with a cylinder cover body (11), and the top of the cylinder cover body (11) is provided with a plurality of nuts (12) screwed with the connecting bolt (102), the nut (12) is matched with the nest (54), and the cylinder cover body (11) is fixedly connected to the top of the cylinder body (10) through the cooperation of the connecting bolt (102) and the nut (12).

7. The marine cylinder head expander of claim 6, wherein, The outside of the cylinder body (10) is provided with an outer frame (20), the outer frame (20) is fixedly connected with an upper fixed ring (21) and a lower fixed ring (22) on the outside, the gear ring (403) is rotatably assembled on the inside of the upper fixed ring (21), and the top of the outer frame (20) is fixedly connected with a handle (23).

8. The marine cylinder head expander of claim 7, wherein, The top of the outer frame (20) is fixedly installed with a motor (401), the driving end of the motor (401) is fixedly connected with a gear two (402), the gear two (402) is engaged with the gear ring (403), the top of the stud (51) is fixedly connected with a gear three (404), and the gear three (404) is engaged with the gear ring (403).

9. The marine cylinder head tensioner of claim 7, wherein, The inner wall of the lower fixed ring (22) is rotatably installed with a gear ring (241), the outside of the gear ring (241) is fixedly connected with a rotating ring (2411), a plurality of lead screws (242) are penetratingly arranged on the lower fixed ring (22), the end of the lead screw (242) close to the cylinder body (10) is provided with a clamping piece (243), the outside of the lead screw (242) is threadedly connected with a gear one (244), the gear one (244) is rotatably installed on the lower fixed ring (22), and the gear one (244) is engaged with the gear ring (241).

10. The marine cylinder head tensioner of claim 6, wherein, The outside of the gas rod (101) is sleeved with a hydraulic ring one (301) and a hydraulic ring two (302), the hydraulic ring one (301) and the hydraulic ring two (302) are fixedly installed on the outer frame (20), the hydraulic ring one (301) is provided with an oil inlet one (3011) and a plurality of oil inlets two (3012) corresponding to the cavity shell (501), and the plurality of oil inlets two (3012) are respectively communicated with the plurality of hydraulic cavities (5011), the hydraulic ring two (302) is provided with an oil outlet one (3021) and a plurality of oil outlets two (3022) corresponding to the cavity shell (501), and the plurality of oil outlets two (3022) are respectively communicated with the plurality of hydraulic cavities (5011).

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