Multi-point synchronous mechanical lifting sled device

Abstract

The application discloses a multi-point synchronous mechanical lifting sled device, which comprises a sled, two driving horizontal shafts and a driving vertical shaft arranged in the sled, and the two ends of the driving vertical shaft are connected with the two driving horizontal shafts through a speed reducer I and a speed reducer II respectively; the driving vertical shaft is connected with a motor through an input shaft at one end of the speed reducer II; the two ends of the driving horizontal shafts respectively extend out of the sled and are connected with a worm gear lifting device through a shaft coupling; each driving horizontal shaft passes through the worm inner hole of the speed reducer I and the speed reducer II, and the worms of the speed reducer I and the speed reducer II drive the two driving horizontal shafts to rotate respectively; the application avoids a complex hydraulic system, and small input torque can be used to realize stable synchronous lifting of the sled, and even the sled is not affected by the unbalanced load during lifting, and in addition, the lifting speed and height of the sled can be accurately controlled through the motor.

Description

Technical Field

[0001] This invention belongs to the technical field of oil and gas equipment transportation equipment, specifically involving a multi-point synchronous mechanical lifting skid device. Background Technology

[0002] In the field of oil drilling and production equipment, with the increasing demand for shorter drilling operation cycles and intensifying competition in the oil equipment market, modular transportation and installation of equipment has become a major trend in the development of oil drilling and production equipment. Especially for mobile drilling and workover rigs with short operation cycle requirements, transporting the equipment by mounting it on a trailer that can be moved quickly has become an important way to meet the needs of rapid relocation and installation of drilling and workover rigs.

[0003] Currently, many equipment skids use hydraulic cylinders for synchronous lifting. However, due to the often uneven weight distribution after installation, the skids cannot achieve precise synchronous lifting during multi-cylinder lifting, sometimes even leading to skid deformation. Furthermore, using hydraulic cylinders for equipment skid lifting requires an additional hydraulic system, increasing not only procurement and management costs but also the complexity of the skid's structural design and operation. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-point synchronous mechanical lifting skid device that overcomes the large friction between the lifting screw and the support seat during the skid lifting process, thereby improving its stability. Furthermore, this device can transfer all the axial force on the lifting screw to the skid, while the worm gear of this device only transmits torque and does not bear additional axial or radial forces.

[0005] The technical solution adopted in this invention is: a multi-point synchronous mechanical lifting skid device, including a skid, with two drive horizontal shafts and one drive vertical shaft installed inside the skid. The two ends of the drive vertical shaft are connected to the two drive horizontal shafts respectively through reducer I and reducer II. The drive vertical shaft is connected to a motor through the input shaft of one end of reducer II. The two ends of the drive horizontal shaft extend out of the skid and are connected to a worm gear lifting device through couplings. Each drive horizontal shaft passes through the inner hole of the worm gear of reducer I and reducer II, and the worm gears of reducer I and reducer II drive the two drive horizontal shafts to rotate respectively. The drive horizontal shafts, reducer I, drive vertical shaft, couplings, reducer II, and motor together constitute the power transmission system of the skid.

[0006] The invention is further characterized in that,

[0007] The worm gear lifting device is fixedly connected to the skid via a lifting device mounting base. The worm gear lifting device includes adjustable outriggers, each with a threaded telescopic screw. The telescopic screw has an upward-facing sliding outer surface and a downward-facing lifting external thread. A pair of anti-rotation grooves are also provided on the lifting external thread section. The inner wall of the telescopic screw has an internal thread that connects to the adjustable outriggers. An internal thread matching the lifting external thread is provided within the inner rotating shaft. The telescopic screw and the inner rotating shaft are connected via the lifting external and internal threads. A key is located in the middle of the outer wall of the inner rotating shaft, connecting it to the worm gear of the worm gear reducer.

[0008] The adjustable outrigger includes an adjusting screw mounted on a support plate, with an adjusting nut fitted on the adjusting screw. The adjusting screw is fixedly connected to the support plate via a cap and screws. The adjusting screw is connected to a telescopic screw via an internal thread.

[0009] Two support frames are connected to the inner rotating shaft. The two support frames are located on both sides of the worm gear reducer. The support frame includes a hollow bushing that fits into the inner rotating shaft and a mounting base. The mounting base is fixedly connected to the outer wall of the hollow bushing. A positioning stop is provided on the outer wall of the hollow bushing near the end of the worm gear reducer. The hollow bushing and the worm gear reducer are connected through the positioning stop. The mounting base is fixedly connected to the mounting base of the lifting device.

[0010] The outer circular surfaces at both ends of the inner rotating shaft are fitted with thin-walled sleeve-shaped support bearings. The support bearings are installed in the bearing grooves of the hollow bushing, allowing the inner rotating shaft to rotate freely in the bearing grooves.

[0011] A top cover is fixedly connected to the upper end of the hollow bushing located at the top. A thrust bearing mounting groove a is provided inside the top cover, and a thrust bearing a is installed in the thrust bearing mounting groove a. The upper end of the inner rotating shaft rests on the thrust bearing a. The top cover is tightened by clamping bolts. A lower cover is fixedly connected to the lower end of the hollow bushing located at the bottom. A thrust bearing mounting groove b is provided inside the lower cover, and a thrust bearing b is installed in the thrust bearing mounting groove b. The lower end of the inner rotating shaft rests on the thrust bearing b. An anti-rotation clamping plate is also fixedly connected below the lower cover. The inner hole of the anti-rotation clamping plate is designed with anti-rotation teeth. The anti-rotation teeth mesh with the anti-rotation groove of the external thread section of the telescopic screw lifting mechanism to prevent the telescopic screw from rotating. The lower cover and the anti-rotation clamping plate are fixedly pressed onto the hollow bushing by clamping bolts b.

[0012] The skid is equipped with two sets of symmetrically distributed drive shaft through holes, which are used to drive the horizontal shaft to pass through the skid.

[0013] It also includes a motor mounting bracket installed inside the skid, which is used to secure the motor.

[0014] The worm gear lifting device is connected to the lifting device mounting base at both ends of the skid via connecting bolts; the keyways in the worm gear inner holes of reducer I and reducer II are keyed to the drive horizontal shaft, and the input shafts at both ends of reducer II are connected to the drive longitudinal shaft and the motor respectively via couplings.

[0015] The beneficial effects of the present invention are as follows: The multi-point synchronous mechanical lifting skid device provided by the present invention uses two worm gear reducers to reduce speed and increase torque for each lifting screw. Therefore, a very small input torque can achieve smooth lifting and lowering of the skid. At the same time, since each worm gear lifting device has the same structure and the same input speed and torque, even under severe off-center loading of the skid, the smooth and synchronous lifting and lowering of the skid can be well guaranteed.

[0016] This invention avoids the complex hydraulic system and can achieve smooth and synchronous lifting of the skid with a small input torque. It is even unaffected by the skid's off-center load during the lifting process. In addition, the lifting speed and height of the skid can be precisely controlled by controlling the electric motor. Attached image description:

[0017] Figure 1 This is a schematic diagram of the multi-point synchronous mechanical lifting skid device of the present invention;

[0018] Figure 2 This is a simplified diagram of the skid of the present invention;

[0019] Figure 3 This is a simplified diagram of the speed reducer I of the present invention;

[0020] Figure 4 This is a simplified diagram of the speed reducer II of the present invention;

[0021] Figure 5 This is a schematic diagram and exploded view of the worm gear lifting device of the present invention;

[0022] Figure 6 This is a schematic diagram of the top cover of the present invention;

[0023] Figure 7 This is a schematic diagram of the support frame of the present invention;

[0024] Figure 8 This is a schematic diagram of the worm gear reducer of the worm gear lifting device of the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of the inner rotating shaft of the present invention;

[0026] Figure 10 This is a schematic diagram of the telescopic lead screw of the present invention;

[0027] Figure 11 This is a schematic diagram of the structure of the lower cover of the present invention;

[0028] Figure 12 This is a schematic diagram of the anti-rotation card plate of the present invention;

[0029] Figure 13 This is a schematic diagram of the structure of the supporting bearing of the present invention;

[0030] Figure 14 This is a schematic diagram of the thrust bearing structure of the present invention;

[0031] Figure 15 This is a schematic diagram of the adjustable support leg of the present invention.

[0032] In the diagram, 1. Skid, 2. Worm gear lifting device, 3. Drive horizontal shaft, 4. Reducer I, 5. Drive vertical shaft, 6. Coupling, 7. Reducer II, 8. Electric motor, 9. Connecting bolt, 10. Support frame, 11. Worm gear reducer, 12. Telescopic screw, 13. Adjustable outrigger, 14. Clamping bolt, 15. Top cover, 16. 17. Thrust bearing a, 18. Support bearing shell, 19. Inner rotating shaft, 20. Key, 21. Lower cover, 22. Anti-rotation clamping plate, 23. Hollow bushing, 24. Lifting device mounting base, 25. Reducer mounting base, 26. Motor mounting base, 27. Drive shaft through hole, 28. Input shaft, 39. Worm gear inner hole keyway, 30. Thrust bearing mounting slot a, 31. Anti-rotation tooth, 32. Sliding surface, 33. Lifting external thread, 34. Anti-rotation clamping groove, 35. Internal thread, 36. Positioning stop, 37. Mounting base, 38. Bearing shell groove, 39. Lifting internal thread, 40. Keyway, 41. Screw slide, 43. Adjusting nut, 44. Support plate, 45. Pressure cap, 46. Adjusting screw, 47. Screw Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. All other embodiments obtained by those skilled in the art based on the described embodiments are within the scope of protection of the present invention.

[0034] The multi-point synchronous mechanical lifting skid device structure of the present invention, such as Figure 1-2As shown, the device includes a skid 1, which is welded from structural steel. The skid 1 contains two horizontal drive shafts 3 and one vertical drive shaft 5. The two ends of the vertical drive shaft 5 are connected to the two horizontal drive shafts 3 via reducers I 4 and II 7, respectively. The vertical drive shaft 5 is connected to a motor 8 via the input shaft 27 at one end of reducer II 7. The two ends of the horizontal drive shafts 3 extend outside the skid 1 and are connected to a worm gear lifting device 2 via couplings. Each horizontal drive shaft 3 passes through the inner bore of the worm gears of reducers I 4 and II 7, and the worm gears of reducers I 4 and II 7 drive the two horizontal drive shafts 3 to rotate. The horizontal drive shafts 3, reducers I 4, vertical drive shaft 5, couplings 6, reducers II 7, and motor 8 together constitute the power transmission system of the skid.

[0035] like Figure 5 As shown, the worm gear lifting device 2 is fixedly connected to the skid via the lifting device mounting base 23. The worm gear lifting device 2 includes an adjustable support leg 13, on which a telescopic screw 12 is threadedly connected. The upper part of the outer wall of the telescopic screw 12 is a sliding outer circular surface 32, and the lower part is a lifting external thread 33. A pair of anti-rotation grooves 34 are also provided in the lifting external thread 33 section. The inner wall of the telescopic screw 12 is provided with an internal thread 35 that connects to the adjustable support leg 13. The inner rotating shaft 18 is provided with a lifting internal thread 39 that matches the lifting external thread 33. The telescopic screw 12 and the inner rotating shaft 18 are connected through the lifting external thread 33 and the lifting internal thread 39. A key 19 is provided in the middle of the outer wall of the inner rotating shaft 18. The inner rotating shaft 18 is connected to the worm gear of the worm gear reducer 11 through the key 19.

[0036] The two anti-rotation slots 34 cooperate with the anti-rotation teeth 31 of the anti-rotation plate 21 to prevent the telescopic screw 12 from rotating. The screw slide 41 formed by the inner rotating shaft 18 of the telescopic screw 12 can move axially.

[0037] The power transmitted by the drive shaft 3 is used to drive the worm gear reducer 11 to achieve a lower speed for its worm wheel. Simultaneously, the worm wheel of the worm gear reducer 11 drives the inner rotating shaft 18 to rotate via the internal key 19. Because the inner rotating shaft 18 ( Figure 9 The internal design features a lifting internal thread 39 and an internally formed lead screw slide 41. Therefore, when the telescopic lead screw 12 ( Figure 10When the telescopic screw 12 is installed in the internal thread 39 of the inner rotating shaft 18 through its external lifting thread 33 and the sliding outer circular surface 32 of the telescopic screw 12 is engaged with the screw slide 41 of the inner rotating shaft 18, when the anti-rotation plate 21 is used to prevent the circumferential rotation of the telescopic screw 12, the relative rotation of the helical pair formed between the telescopic screw 12 and the inner rotating shaft 18 will cause the telescopic screw 12 to move axially relative to the inner rotating shaft 18, that is, to realize the axial lifting motion of the telescopic screw 12. In addition, since the worm gear reducer 11 has a large reduction and torque amplification function, even with a small input torque and a high speed, the inner rotating shaft 18 can obtain a large torque and a low speed.

[0038] like Figure 15 As shown, the adjustable support leg 13 includes an adjusting screw 46 mounted on the support plate 44, an adjusting nut 43 fitted on the adjusting screw 46, and the adjusting screw 46 is fixedly connected to the support plate 44 through a pressure cap 45 and a screw 47; the adjusting screw 46 is connected to the telescopic screw 12 through an internal thread 35.

[0039] Two support frames 10 are connected to the inner rotating shaft 18. The two support frames 10 are located on both sides of the worm gear reducer 11. Each support frame 10 includes a hollow bushing 22 that fits into the inner rotating shaft 18 and a mounting base 37 (e.g., Figure 7 As shown), the mounting base 37 is fixedly connected to the outer wall of the hollow bushing. The outer wall of the hollow bushing near the end of the worm gear reducer 11 is provided with a positioning stop 36. The hollow bushing and the worm gear reducer 11 are connected through the positioning stop 36. The mounting base 37 is fixedly connected to the hoisting device mounting base 23.

[0040] like Figure 8 As shown, the worm gear reducer 11 is mainly used to transmit the torque and speed of the drive horizontal shaft 3 to the inner rotating shaft 18, so that the inner rotating shaft 18 rotates in a circle on the support frame 10. The worm wheel of the worm gear reducer 11 drives the inner rotating shaft 18 through the key 19. Since the worm gear reducer 11 has a large speed reduction and torque amplification function, the worm gear reducer 11 can convert the high speed and small torque of the drive horizontal shaft 3 into the low speed and large torque of the inner rotating shaft 18.

[0041] The outer circular surfaces at both ends of the inner rotating shaft 18 are fitted with thin-walled sleeve-shaped support bearings 17 (such as...). Figure 13 As shown, the support bearing 17 is installed in the bearing groove 38 of the hollow bushing, so that the inner rotating shaft 18 can rotate freely in the bearing groove 38.

[0042] The inner rotating shaft 18 is a hollow shaft structure, with an internal lifting internal thread 39 and a lead screw slide 41. Both ends are designed with thrust bearing mounting grooves for matching and installing thrust bearings. The outer circular surfaces at both ends can mate with the inner holes of the support bearing 17. The middle outer circular surface and key 19 mate with the inner hole of the worm gear reducer 11 and the keyway 40. In this way, the worm gear reducer 11 can drive the inner rotating shaft 18 to rotate together with it.

[0043] A top cover 15 is fixedly connected to the upper end of the hollow bushing 22 located at the top (e.g., Figure 5 As shown), a thrust bearing mounting groove a30 is provided inside the top cover 15, and a thrust bearing a16 (as shown) is installed in the thrust bearing mounting groove a30. Figure 14 As shown), the upper end of the inner rotating shaft 18 rests on the thrust bearing a16, and the top cover 15 is tightened by the clamping bolts 14; the lower end of the hollow bushing 22 located at the bottom is fixedly connected to the lower cover 20, and the lower cover 20 is provided with a thrust bearing mounting groove b, in which a thrust bearing b is installed, and the lower end of the inner rotating shaft 18 rests on the thrust bearing b; an anti-rotation clamping plate 21 is also fixedly connected below the lower cover 20 (as shown). Figure 12 As shown), the inner hole of the anti-rotation plate 21 is designed with anti-rotation teeth 31. The anti-rotation teeth 31 mesh with the anti-rotation groove 34 of the external thread 33 of the telescopic screw lifting mechanism to prevent the telescopic screw 12 from rotating. The lower cover 20 and the anti-rotation plate 21 are fixed and pressed onto the hollow shaft sleeve by the clamping bolt b.

[0044] Top cover 15 (e.g.) Figure 6 (as shown) and lower cover 20 (as shown) Figure 11 The structure is the same as shown, and it is used to bear the axial force acting on the inner rotating shaft 18 when the skid is lifted. The thrust bearing a16 can effectively reduce the friction when the inner rotating shaft 18 rotates.

[0045] The skid 1 is provided with two sets of symmetrically distributed drive shaft through holes 26, which are used to drive the horizontal shaft 3 to pass through the skid.

[0046] It also includes a motor mounting bracket 25 installed inside the skid, which is used to fix the motor 8.

[0047] The worm gear lifting device is connected to the lifting device mounting bases 23 at both ends of the skid 1 via connecting bolts 9; as shown Figures 3-4As shown, the keyway 28 of the worm gear inner bore of reducer I4 and reducer II7 is keyed to the drive horizontal shaft 3. The input shafts 27 at both ends of reducer II7 are connected to the drive vertical shaft 5 and the motor 8 respectively through couplings. Each drive horizontal shaft 3 passes through the inner bore of the worm gear of reducer I4 and reducer II7. The worm gears of reducer I4 and reducer II7 drive the two drive horizontal shafts 3 to rotate respectively. Then, a drive vertical shaft 5 is used to connect the input shafts 27 at one end of reducer I4 and reducer II7 through a coupling 6. In addition, since the worm of reducer II7 is a double-headed structure (e.g., Figure 4 As shown), the input shaft 27 at the other end of the reducer II 7 is connected to the motor via the coupling 6, thus forming the mechanical lifting system of the skid. The motor transmits power to a drive shaft 3 at the front end of the skid via the coupling and reducer II 7. At the same time, the input shaft 27 at the other end of the reducer II 7 also transmits power to the reducer I 4 via the coupling. Then, the reducer I 4 drives another drive shaft 3, and the speed and torque of the two drive shafts 3 are the same. Finally, the two drive shafts 3 drive the worm gear lifting devices 2 on both sides of the skid with the same speed and torque, and finally achieve the purpose of the same lifting speed of the worm gear lifting devices 2 on both sides of the skid.

[0048] The adjustable support leg 13 of the worm gear lifting device 2 of the present invention mainly includes an adjusting nut 43, a support plate 44, a pressure cap 45, an adjusting screw 46, and a screw 47. This device is mainly used to fine-tune the worm gear lifting device 2 before the skid 1 is lifted, so that the skid 1 is adjusted to a horizontal plane.

[0049] This invention discloses a multi-point synchronous mechanical lifting device for tow skids. The device mainly includes a tow skid, a worm gear reducer, a drive shaft, a coupling, and a worm gear lifting mechanism. It avoids the need for a complex hydraulic system and achieves smooth and slow synchronous lifting of the tow skid with a relatively small input torque. Furthermore, the lifting height and speed of the tow skid can be precisely controlled by adjusting the input speed of the motor. The device effectively overcomes the significant friction between the lifting screw and the support base during lifting, improving stability. Additionally, because the worm gear lifting mechanism has a uniform transmission ratio and the same input speed and torque, it can ensure stable synchronous lifting of the tow skid even under severe off-center loading.

Claims

1. A multi-point synchronous mechanical lifting skid device, characterized in that, The system includes a skid (1), which is equipped with two drive horizontal shafts (3) and one drive vertical shaft (5). The two ends of the drive vertical shaft (5) are connected to the two drive horizontal shafts (3) through reducers I (4) and II (7), respectively. The drive vertical shaft (5) is connected to the motor (8) through the input shaft (27) at one end of reducer II (7). The two ends of the drive horizontal shaft (3) extend out of the skid (1) and are connected to the worm gear lifting device (2) through couplings. Each drive horizontal shaft (3) passes through the worm wheel inner hole of reducer I (4) and reducer II (7), and the worm wheels of reducer I (4) and reducer II (7) drive the two drive horizontal shafts (3) to rotate. The drive horizontal shaft (3), reducer I (4), drive vertical shaft (5), coupling (6), reducer II (7), and motor (8) together form the power transmission system of the skid. The worm gear lifting device (2) is fixedly connected to the skid via a lifting device mounting base (23); the worm gear lifting device (2) includes an adjustable support leg (13), on which a telescopic screw (12) is threadedly connected. The upper part of the outer wall of the telescopic screw (12) is a sliding outer circular surface (32), and the lower part is a lifting external thread (33). A pair of anti-rotation grooves (34) are also provided on the lifting external thread (33) section. The inner wall of the inner rotating shaft (18) is provided with an internal thread (35) that is connected to the adjustable support leg (13); the inner rotating shaft (18) is provided with a section of lifting internal thread (39) that matches the lifting external thread (33); the telescopic screw (12) is connected to the inner rotating shaft (18) through the lifting external thread (33) and the lifting internal thread (39); a key (19) is provided at the middle of the outer wall of the inner rotating shaft (18); the inner rotating shaft (18) is connected to the worm wheel of the worm gear reducer (11) through the key (19); Two support frames (10) are connected to the inner rotating shaft (18). The two support frames (10) are located on both sides of the worm gear reducer (11). Each support frame (10) includes a hollow bushing (22) that is sleeved with the inner rotating shaft (18) and a mounting seat (37). The mounting seat (37) is fixedly connected to the outer wall of the hollow bushing. A positioning stop (36) is provided on the outer wall of the hollow bushing near the end of the worm gear reducer (11). The hollow bushing is connected to the worm gear reducer (11) through the positioning stop (36). The mounting seat (37) is fixedly connected to the lifting device mounting seat (23). The worm gear lifting device is connected to the lifting device mounting base (23) at both ends of the skid (1) by connecting bolts (9); the keyway (28) of the worm gear inner hole of the reducer I (4) and reducer II (7) is keyed to the drive horizontal shaft (3); the input shaft (27) at both ends of the reducer II (7) is connected to the drive vertical shaft (5) and the motor (8) respectively by coupling (6).

2. The multi-point synchronous mechanical lifting skid device according to claim 1, characterized in that, The adjustable support leg (13) includes an adjusting screw (46) mounted on a support plate (44), and an adjusting nut (43) is fitted on the adjusting screw (46). The adjusting screw (46) is fixedly connected to the support plate (44) through a pressure cap (45) and a screw (47). The adjusting screw (46) is connected to the telescopic screw (12) through an internal thread (35).

3. The multi-point synchronous mechanical lifting skid device according to claim 1, characterized in that, The outer circular surfaces at both ends of the inner rotating shaft (18) are fitted with thin-walled sleeve-shaped support bearings (17). The support bearings (17) are installed in the bearing grooves (38) of the hollow bushing, so that the inner rotating shaft (18) can rotate freely in the bearing grooves (38).

4. The multi-point synchronous mechanical lifting skid device according to claim 3, characterized in that, A top cover (15) is fixedly connected to the upper end of the hollow bushing (22) located at the top. A thrust bearing mounting groove a (30) is provided inside the top cover (15). A thrust bearing a (16) is installed inside the thrust bearing mounting groove a (30). The upper end of the inner rotating shaft (18) rests on the thrust bearing a (16). The top cover (15) is pressed tightly by a clamping bolt (14). A lower cover (20) is fixedly connected to the lower end of the hollow bushing (22) located at the bottom. A thrust bearing mounting groove b is provided inside the lower cover (20). A thrust bearing b is installed in the bearing mounting groove b, and the lower end of the inner rotating shaft (18) rests on the thrust bearing b; an anti-rotation plate (21) is also fixedly connected below the lower cover (20), and the inner hole of the anti-rotation plate (21) is designed with anti-rotation teeth (31). The anti-rotation teeth (31) mesh with the anti-rotation groove (34) of the external thread (33) of the telescopic screw lifting section and are used to prevent the telescopic screw (12) from rotating; the lower cover (20) and the anti-rotation plate (21) are fixedly pressed on the hollow bushing (22) by the clamping bolts b.

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