Two-stage spiral acceleration jacking mechanism with compensation function and operation method

Abstract

The invention provides a two-stage spiral acceleration jacking mechanism with a compensation function and an operation method. A first-stage screw rod is installed in a base through rotation limiting of an inner end cover, a first-stage screw sleeve is installed on the threaded section of the first-stage screw rod in a threaded transmission fit mode, and a first-stage cylinder sleeve is fixedly installed on the first-stage screw sleeve; the first-stage cylinder sleeve is installed in the fixing barrel in a sliding mode through a first sliding key, the fixing barrel is fixed to the base, the end of the first-stage screw is provided with the second-stage screw in a transmission mode through a transmission key structure, the second-stage screw is installed on the first-stage screw sleeve in a rotating mode at the same time, and the second-stage screw sleeve is installed outside the second-stage screw in a threaded transmission mode. And the second-stage threaded sleeve is installed in the first-stage cylinder sleeve in a sliding mode through a second sliding key, a sealing end cover is fixed to the end of the second-stage threaded sleeve, and a top plate is installed at the end of the sealing end cover through a ball head.

Description

Technical Field

[0001] This invention relates to the field of deep-sea lifting equipment, and in particular to a two-stage spiral acceleration lifting mechanism with compensation function and its operating method. Background Technology

[0002] In the development of a certain deep-sea equipment, a linear lifting and translation mechanism is required, and high lifting speed is demanded. Therefore, the commonly used solution is a single-stage screw lifting mechanism, which uses the threaded transmission between the screw and the cylinder liner to drive the cylinder liner to extend, thereby achieving the lifting purpose. However, the following problems exist in actual operation: (1) Because this deep-sea equipment has high requirements for the lifting speed, the existing single-stage spiral lifting mechanism has limited lifting speed and cannot meet the speed requirements for lifting or retraction. (2) Due to the deep-sea operation, the lifting mechanism will be affected by seawater pressure, and its movement stability will vary with the seawater depth, which will seriously affect the stability of the transmission. (3) Due to the influence of seawater pressure, the oil inside the piston rod is not replenished in time during the extension or retraction process, which affects the transmission effect. (4) Since deep-sea operations require the lifting mechanism to operate in a sealed environment to ensure the sealing effect, it is necessary to replenish the piston cavity with oil during the cylinder liner ejection or retraction process. However, the existing fixed volume cannot provide timely dynamic oil compensation, which affects the transmission stability and also poses a certain risk of sealing leakage and water ingress. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a two-stage spiral acceleration lifting mechanism and its operating method with compensation function. This lifting mechanism converts the input rotational motion into the output accelerated linear motion through a two-stage spiral mechanism that moves simultaneously, thereby performing load-bearing extension and retraction operations to well meet the lifting speed requirements in the deep sea. In addition, during the extension of the accelerator, the oil sealed inside the accelerator automatically compensates for the expansion of the accelerator's inner cavity under the pressure of seawater through the contraction of the bladder. During the retraction of the accelerator, the volume of the accelerator's inner cavity gradually decreases, and the pressure of the seawater dampens the oil through the bladder, thereby ensuring the smoothness of the accelerator's retraction action and thus ensuring transmission accuracy.

[0004] To achieve the aforementioned technical features, the present invention aims to provide a two-stage spiral acceleration lifting mechanism with compensation function, characterized in that it includes a base, a primary screw mounted inside the base via an inner end cap for rotational limitation, a primary screw sleeve mounted on the threaded section of the primary screw via threaded transmission, a primary cylinder sleeve fixedly mounted on the primary screw sleeve, the primary cylinder sleeve being slidably mounted inside a fixed cylinder via a first sliding key, the fixed cylinder being fixed to the base, a secondary screw mounted at the end of the primary screw via a transmission key structure, the secondary screw being simultaneously mounted on the primary screw sleeve, a secondary screw sleeve mounted on the outside of the secondary screw via threaded transmission, the secondary screw sleeve being slidably mounted inside the primary cylinder sleeve via a second sliding key, a sealing end cap fixed at the end of the secondary screw sleeve, and a top plate mounted at the end of the sealing end cap via a ball head.

[0005] Preferably, a positioning shoulder is machined on the first-stage screw and located on the shaft section where the base cavity is located. Thrust bearings are positioned and installed on both sides of the positioning shoulder, and the thrust bearings are located inside the base cavity.

[0006] Preferably, during operation, the extended shaft section of the primary screw is connected to the output shaft section of the power unit via the main drive key to transmit torque; The transmission key structure includes a spline groove machined on the inner end of the first-stage screw, and the spline groove and the spline on the inner wall of the second-stage screw form a sliding key transmission fit.

[0007] Preferably, the primary cylinder liner is fixedly connected to the primary threaded sleeve by a pin; The fixed cylinder is fixedly connected to the base by the first bolt; The sealing end cap is fixedly connected to the end of the secondary threaded sleeve by the second bolt.

[0008] Preferably, the first sliding key is fixedly installed on the first-stage cylinder liner by a set screw, and the first sliding key and the first keyway machined inside the first-stage cylinder liner form a sliding fit, so that the first-stage cylinder liner can move linearly along the axial direction.

[0009] Preferably, the second sliding key is fixedly mounted on the secondary threaded sleeve by a set screw, and the second sliding key and the second keyway machined inside the secondary threaded sleeve form a sliding fit, so that the secondary threaded sleeve can move linearly along the axial direction.

[0010] Preferably, the secondary screw is rotatably mounted on the end of the primary screw sleeve via a bearing.

[0011] Preferably, the fixed cylinder is sealed with a bladder by an outer shell, the outer shell is machined with a seawater through hole for connecting seawater, the inside of the bladder is filled with oil, the outer shell is positioned on the fixed cylinder by a retaining ring, the fixed cylinder is machined with a first connecting hole for connecting the bladder, and the secondary screw sleeve is machined with an oblique connecting hole to connect the inner cavity of the primary cylinder sleeve and the secondary screw.

[0012] Preferably, sealing components for sealing are respectively provided between the fixed cylinder and the first-stage cylinder liner, between the first-stage cylinder liner and the second-stage threaded sleeve, and between the inner end cover and the first-stage screw.

[0013] Another aspect of the present invention provides a method for operating a two-stage spiral acceleration lifting mechanism with compensation function: Outward movement: The primary screw rotates clockwise, the direction determined by the thread direction. The primary screw drives the primary sleeve, which meshes with it, to move outwards. The primary sleeve connects to the primary cylinder liner, causing the primary cylinder liner to extend outwards. Simultaneously, the primary screw drives the secondary screw to rotate synchronously via a transmission key structure. The secondary screw meshes with the secondary sleeve, causing the secondary sleeve to also extend outwards. The sealing end cap moves outwards along with it. The simultaneous outward movement of the primary cylinder liner and the secondary sleeve accelerates the outward movement of the sealing end cap. As the sealing end cap moves outwards, the internal space gradually increases. Seawater pressure causes the bladder to contract inwards, compensating for the oil in the internal cavity and ensuring that the oil fills the cavity promptly. This maintains pressure balance between the internal and external cavities while also providing sufficient lubrication to all internal components. Inward movement: The primary screw rotates in the opposite direction, determined by the thread direction, driving the primary screw sleeve it meshes with to move inward. The primary screw sleeve connects with the primary cylinder liner, causing the primary cylinder liner to also move inward. Simultaneously, the primary screw meshes with the secondary screw, which drives the secondary screw to rotate. The secondary screw meshes with the secondary screw sleeve, causing the secondary screw sleeve to also move inward. The sealing end cover moves inward along with this. The simultaneous inward movement of the primary cylinder liner and the secondary screw sleeve accelerates the inward movement of the sealing end cover. As the sealing end cover moves inward, the space inside the cavity gradually decreases. The pressure of the oil overcomes the pressure of the seawater, causing the bladder to expand outward. This ensures that the oil fills the accelerator's cavity at all times and maintains a pressure balance between the inner and outer cavities, resulting in smooth operation of the sealing end cover and sufficient lubrication for all internal components.

[0014] The present invention has the following beneficial effects: 1. The lifting mechanism of the present invention converts the input rotational motion into the output accelerated linear motion through a two-stage simultaneously moving screw mechanism, thereby performing load-bearing telescopic operations to well meet the lifting speed requirements in the deep sea.

[0015] 2. During the extension process, the oil sealed inside the cavity automatically compensates for the increased volume of the cavity under the pressure of seawater through the contraction of the bladder. During contraction, the volume of the cavity gradually decreases, and the pressure of the seawater dampens the oil through the bladder, thus ensuring the smoothness of the accelerator's contraction action and consequently guaranteeing transmission accuracy.

[0016] 3. The thrust bearing mentioned above ensures that the first-stage screw can rotate smoothly and withstand a certain axial force.

[0017] 4. The first-stage screw is driven to rotate by a power device, which in turn drives the subsequent first-stage screw sleeve to move linearly, and simultaneously drives the second-stage screw to rotate synchronously.

[0018] 5. The transmission key structure described above ensures that the first-stage screw can synchronously drive the second-stage screw to rotate during rotation, while also ensuring that the second-stage screw can slide linearly along the axial direction.

[0019] 6. Through the transmission cooperation between the first sliding key and the first keyway, it is ensured that the first-stage cylinder liner can only move in a straight line during operation and will not rotate.

[0020] 7. Through the transmission and cooperation of the second sliding key and the second keyway, it is ensured that the secondary threaded sleeve can only move in a straight line during operation and will not rotate. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a main sectional view of the present invention.

[0023] Figure 2 This is a front view of the overall structure of the present invention.

[0024] Figure 3 For the present invention Figure 2 AA view.

[0025] Figure 4 This is a schematic diagram of the retracted state of the present invention.

[0026] Figure 5 This is a schematic diagram of the extended state of the present invention.

[0027] In the diagram: 1. Primary screw; 2. Primary sleeve; 3. Primary cylinder liner; 4. Secondary screw; 5. Secondary sleeve; 6. Leather bladder; 7. Outer shell; 8. Fixed cylinder; 9. Sealing end cap; 10. Second bolt; 11. Sealing assembly; 12. Thrust bearing; 13. Main drive key; 14. Base; 15. First bolt; 16. Inner end cap; 17. First connecting hole; 18. Seawater through hole; 19. First sliding key; 20. Set screw; 21. Second sliding key; 22. Second keyway; 23. Oil; 24. Oblique connecting hole; 25. Snap ring; 26. Ball head; 27. Top plate; 28. Positioning shoulder; 29. ​​Pin; 30. Bearing; 101. Spline groove; 301. First keyway; 401. Detailed Implementation

[0028] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0029] Example 1: See Figure 1-5 A two-stage spiral acceleration lifting mechanism with compensation function is characterized by comprising a base 14, inside which a primary screw 1 is rotatably limited by an inner end cover 16. A primary screw sleeve 2 is installed on the threaded section of the primary screw 1 via threaded transmission. A primary cylinder sleeve 3 is fixedly installed on the primary screw sleeve 2. The primary cylinder sleeve 3 is slidably installed inside a fixed cylinder 8 via a first sliding key 19. The fixed cylinder 8 is fixed to the base 14. A secondary screw 4 is driven and installed at the end of the primary screw 1 via a transmission key structure. The secondary screw 4 is simultaneously fixedly installed on the primary screw sleeve 2. A secondary screw sleeve 5 is installed on the outside of the secondary screw 4 via threaded transmission. The secondary screw sleeve 5 is slidably installed inside the primary cylinder sleeve 3 via a second sliding key 21. A sealing end cover 9 is fixed at the end of the secondary screw sleeve 5. A top plate 27 is installed at the end of the sealing end cover 9 via a ball head 26. This lifting mechanism converts the input rotational motion into the output accelerated linear motion through a two-stage simultaneously moving spiral mechanism, thereby enabling loaded telescopic operations to well meet the lifting speed requirements in deep sea environments.

[0030] Furthermore, a positioning shoulder 28 is machined on the shaft segment of the primary screw 1 located within the cavity of the base 14. Thrust bearings 12 are positioned and installed on both sides of the positioning shoulder 28, and the thrust bearings 12 are disposed inside the cavity of the base 14. The aforementioned thrust bearings 12 ensure that the primary screw 1 can rotate smoothly and withstand a certain axial force.

[0031] Furthermore, during operation, the extended shaft section of the first-stage screw 1 is connected to the output shaft section of the power device via the main transmission key 13 and transmits torque. Through the above structure, it can be used to provide lifting power. During operation, the power device drives the first-stage screw 1 to rotate, which in turn drives the subsequent first-stage screw sleeve 2 to move linearly, and simultaneously drives the second-stage screw 4 to rotate synchronously.

[0032] Furthermore, the transmission key structure includes a spline groove 101 machined on the inner end of the primary screw 1, and the spline groove 101 and the spline 401 on the inner wall of the secondary screw 4 form a sliding key transmission fit. This transmission key structure ensures that the primary screw 1 can synchronously drive the secondary screw 4 to rotate during rotation, while also ensuring that the secondary screw 4 can slide linearly along the axial direction.

[0033] Furthermore, the first-stage cylinder liner 3 is fixedly connected to the first-stage threaded sleeve 2 by a pin 29; the pin 29 enables a reliable connection between the first-stage cylinder liner 3 and the first-stage threaded sleeve 2, thereby ensuring that the first-stage threaded sleeve 2 can synchronously drive the first-stage cylinder liner 3 to extend during the extension process.

[0034] Furthermore, the fixing cylinder 8 is fixedly connected to the base 14 by the first bolt 15. The above structure allows the fixing cylinder 8 to be reliably installed on the base 14.

[0035] Furthermore, the sealing end cap 9 is fixedly connected to the end of the secondary threaded sleeve 5 by the second bolt 10. This fixing structure enables the transmission of power.

[0036] Furthermore, the first sliding key 19 is fixedly mounted on the first-stage cylinder liner 3 by a set screw 20. The first sliding key 19 and the first keyway 301 machined inside the first-stage cylinder liner 3 form a sliding fit, allowing the first-stage cylinder liner 3 to move linearly along the axial direction. Through the aforementioned transmission fit between the first sliding key 19 and the first keyway 301, it is ensured that the first-stage cylinder liner 3 can only move along a straight line during operation and will not rotate.

[0037] Furthermore, the second sliding key 21 is fixedly mounted on the secondary threaded sleeve 5 by a set screw. The second sliding key 21 and the second keyway 22 machined inside the secondary threaded sleeve 5 form a sliding fit, allowing the secondary threaded sleeve 5 to move linearly along the axial direction. Through the transmission fit between the second sliding key 21 and the second keyway 22, it is ensured that the secondary threaded sleeve 5 can only move along a straight line during operation and will not rotate.

[0038] Furthermore, the secondary screw 4 is rotatably mounted on the end of the primary screw sleeve 2 via a bearing 30. This structure ensures smooth rotation of the secondary screw 4.

[0039] Furthermore, a bladder 6 is sealed to the outside of the fixed cylinder 8 via a housing 7. The housing 7 has a seawater passage 18 for connecting to seawater. The bladder 6 contains oil 23. The housing 7 is positioned on the fixed cylinder 8 via a retaining ring 25. The fixed cylinder 8 has a first connecting hole 17 for connecting to the bladder 6. The secondary screw sleeve 5 has an oblique connecting hole 24 to connect the inner cavities of the primary cylinder sleeve 3 and the secondary screw 4. The bladder 6 can store hydraulic oil and deform under seawater pressure, thus replenishing the oil inside the cavity. During extension, the oil sealed inside the cavity automatically compensates for the increased volume of the inner cavity under seawater pressure through the contraction of the bladder. During contraction, the volume of the inner cavity gradually decreases, and the seawater pressure dampens the oil through the bladder, ensuring the smoothness of the accelerator's contraction action and thus guaranteeing transmission accuracy.

[0040] Furthermore, sealing components 11 are respectively provided between the fixed cylinder 8 and the first-stage cylinder liner 3, between the first-stage cylinder liner 3 and the second-stage threaded sleeve 5, and between the inner end cover 16 and the first-stage screw 1 for sealing. The sealing components 11 mentioned above achieve a good sealing effect.

[0041] Example 2: Another aspect of the present invention provides a method for operating a two-stage spiral acceleration lifting mechanism with compensation function: Outward movement: The primary screw 1 rotates in the forward direction, determined by the thread direction. The primary screw 1 drives the primary sleeve 2, which meshes with it, to move outward. The primary sleeve 2 connects with the primary cylinder liner 3, causing the primary cylinder liner 3 to extend outward. Simultaneously, the primary screw 1 drives the secondary screw 4 to rotate synchronously via a transmission key structure. The secondary screw 4 meshes with the secondary sleeve 5, causing the secondary sleeve 5 to also extend outward. The sealing end cover 9 moves outward along with this, and the primary cylinder liner 3 and the secondary sleeve 5 move outward simultaneously, accelerating the outward movement of the sealing end cover 9. As the sealing end cover 9 moves outward, the internal space gradually increases. Seawater pressure causes the bladder 6 to contract inward, compensating for the oil in the internal cavity and ensuring that the oil fills the cavity in a timely manner. This maintains a balance between the internal and external pressures while also providing sufficient lubrication for all internal components. Inward movement: The primary screw 1 rotates in the opposite direction, determined by the thread direction, driving the primary screw sleeve 2, which meshes with it, to move inward. The primary screw sleeve 2 connects with the primary cylinder liner 3, so the primary cylinder liner 3 also moves inward. Simultaneously, the primary screw 1 meshes with the secondary screw 4, driving the secondary screw 4 to rotate. The secondary screw 4 meshes with the secondary screw sleeve 5, so the secondary screw sleeve 5 also moves inward. The sealing end cover 9 moves inward along with it. The primary cylinder liner 3 and the secondary screw sleeve 5 move inward simultaneously, driving the sealing end cover 9 to move inward at an accelerated pace. During the inward movement of the sealing end cover 9, the space inside the cavity gradually decreases. The pressure of the oil overcomes the pressure of the seawater, causing the bladder 6 to expand outward. This ensures that the oil fills the inner cavity of the accelerator at all times and maintains the pressure balance between the inner and outer cavities, making the sealing end cover 9 run smoothly and ensuring that all internal components are adequately lubricated.

Claims

1. A two-stage spiral acceleration lifting mechanism with compensation function, characterized in that, The system includes a base (14), inside which a first-stage screw (1) is mounted via an inner end cap (16) for rotational limitation. The threaded section of the first-stage screw (1) is fitted with a first-stage sleeve (2) via threaded transmission. A first-stage cylinder liner (3) is fixedly mounted on the first-stage sleeve (2). The first-stage cylinder liner (3) is slidably mounted inside a fixed cylinder (8) via a first sliding key (19). The fixed cylinder (8) is fixed on the base (14). A second-stage screw (4) is mounted on the end of the first-stage screw (1) via a transmission key structure. The second-stage screw (4) is simultaneously mounted on the first-stage sleeve (2). A second-stage sleeve (5) is mounted on the outside of the second-stage screw (4) via threaded transmission. The second-stage sleeve (5) is slidably mounted inside the first-stage cylinder liner (3) via a second sliding key (21). A sealing end cap (9) is fixed on the end of the second-stage sleeve (5). A top plate (27) is mounted on the end of the sealing end cap (9) via a ball head (26).

2. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: A positioning shoulder (28) is machined on the shaft section of the primary screw (1) located in the cavity of the base (14). Thrust bearings (12) are positioned and installed on both sides of the positioning shoulder (28). The thrust bearings (12) are located inside the cavity of the base (14).

3. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: During operation, the extended shaft section of the first-stage screw (1) is connected to the output shaft section of the power device via the main transmission key (13) and transmits torque. The transmission key structure includes a spline groove (101) machined on the inner end of the first-stage screw (1), and the spline groove (101) and the spline (401) on the inner wall of the second-stage screw (4) form a sliding key transmission fit.

4. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: The first-stage cylinder liner (3) is fixedly connected to the first-stage threaded sleeve (2) by a pin (29); The fixed cylinder (8) is fixedly connected to the base (14) by the first bolt (15); The sealing end cap (9) is fixedly connected to the end of the secondary threaded sleeve (5) by the second bolt (10).

5. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: The first sliding key (19) is fixedly installed on the first-stage cylinder liner (3) by the set screw (20). The first sliding key (19) and the first keyway (301) machined inside the first-stage cylinder liner (3) form a sliding fit, so that the first-stage cylinder liner (3) can move linearly along the axial direction.

6. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: The second slide key (21) is fixedly installed on the secondary threaded sleeve (5) by a set screw. The second slide key (21) and the second keyway (22) machined inside the secondary threaded sleeve (5) form a sliding fit, so that the secondary threaded sleeve (5) can move linearly along the axial direction.

7. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: The secondary screw (4) is rotatably mounted on the end of the primary screw sleeve (2) via a bearing (30).

8. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 1, characterized in that: The fixed cylinder (8) is sealed with a bladder (6) by a shell (7). The shell (7) is machined with a seawater through hole (18) for connecting seawater. The bladder (6) contains oil (23). The shell (7) is positioned on the fixed cylinder (8) by a retaining ring (25). The fixed cylinder (8) is machined with a first connecting hole (17) for connecting the bladder (6). The secondary screw sleeve (5) is machined with an oblique connecting hole (24) to connect the inner cavity of the primary cylinder sleeve (3) and the secondary screw (4).

9. The two-stage spiral acceleration lifting mechanism with compensation function according to claim 8, characterized in that: Sealing components (11) for sealing are respectively provided between the fixed cylinder (8) and the first-stage cylinder liner (3), between the first-stage cylinder liner (3) and the second-stage screw sleeve (5), and between the inner end cover (16) and the first-stage screw (1).

10. The method of operating a two-stage spiral acceleration lifting mechanism with compensation function as described in any one of claims 8-9, characterized in that: Outward movement: The first-stage screw (1) rotates in the forward direction, the direction of which is determined by the direction of the thread. The first-stage screw (1) drives the first-stage sleeve (2) that it meshes with to move outward. The first-stage sleeve (2) is connected to the first-stage cylinder liner (3), so the first-stage cylinder liner (3) extends outward. At the same time, the first-stage screw (1) drives the second-stage screw (4) to rotate synchronously through the transmission key structure. The second-stage screw (4) meshes with the second-stage sleeve (5), and the second-stage sleeve (5) also extends outward. The sealing end cover (9) moves outward along with it. The first-stage cylinder liner (3) and the second-stage sleeve (5) move outward at the same time, driving the sealing end cover (9) to move outward at an accelerated speed. During the outward movement of the sealing end cover (9), the space of the inner cavity gradually increases. The seawater pressure causes the bladder (6) to contract inward, compensating for the oil in the inner cavity, ensuring that the oil fills the inner cavity in time, keeping the pressure of the inner and outer cavities balanced, and also ensuring that the internal components are fully lubricated. Inward movement: The first-stage screw (1) rotates in the opposite direction, determined by the direction of the thread, driving the first-stage screw sleeve (2) that it meshes with to move inward. The first-stage screw sleeve (2) is connected to the first-stage cylinder sleeve (3), so the first-stage cylinder sleeve (3) also moves inward. At the same time, the first-stage screw (1) also meshes with the second-stage screw (4), and the first-stage screw (1) drives the second-stage screw (4) to rotate. The second-stage screw (4) meshes with the second-stage screw sleeve (5), and the second-stage screw sleeve (5) also moves inward. The sealing end cover (9) moves inward along with it. The first-stage cylinder sleeve (3) and the second-stage screw sleeve (5) move inward at the same time, driving the sealing end cover (9) to move inward at an accelerated speed. During the process of the sealing end cover (9) moving inward, the space of the inner cavity gradually decreases. The pressure of the oil overcomes the pressure of the seawater, causing the bladder (6) to expand outward. This ensures that the oil fills the inner cavity of the accelerator at all times and keeps the pressure of the inner and outer cavities balanced, so that the sealing end cover (9) runs smoothly and all internal components are fully lubricated.

Images