Bevel gear transmission mechanism of manual locking device of blowout preventer

Abstract

The utility model discloses a bevel gear transmission mechanism of a manual locking device of a blowout preventer, which belongs to the technical field of well drilling well control equipment, comprises a hand wheel, and is characterized by further comprising an input transmission case, an output transmission case, a mounting seat, a telescopic output shaft and a vibration reduction coupling, the first connecting cylinder is fixed on the input gear box, the output transmission box comprises a transmission gear box, an output gear box, a first transmission shaft, a second transmission shaft and a second connecting cylinder, the transmission gear box is connected with the output gear box through the second connecting cylinder, the transmission gear box is movably connected with the second transmission shaft, and the output gear box is fixed on the mounting seat. One end of the telescopic output shaft is connected with the output gear box, and the other end is connected with the damping coupler. Compared with a cylindrical gear and a worm gear in the prior art, the whole transmission mechanism is stable in transmission ratio, high in bearing capacity, stable and smooth in transmission and more stable and reliable in work.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling well control equipment, in particular to a bevel gear transmission mechanism of a manual locking device of a blowout preventer. Background Art

[0002] As drilling depth continues to increase, there are more and more blowout preventer combinations on site, the height of the manual locking rod is getting higher and higher, and the operating platform that needs to be built is also getting higher and higher; the existing operating platform is narrow and high off the ground, and some even have additional platforms added on the platform, which makes it inconvenient to operate in an emergency and there are safety risks for personnel when operating.

[0003] The existing manual locking device is mainly driven by chain transmission, which has low transmission efficiency, is time-consuming and labor-intensive, and is inconvenient to adjust the height. When the blowout preventer group changes, it is necessary to disassemble and assemble the chain to adjust the vertical height difference between the locking rods. Therefore, it is urgent to develop a transmission mechanism with fast transmission speed, labor-saving operation, and the ability to transmit the manual locking operation of the high-position blowout preventer and the low-position blowout preventer to the appropriate position for manual locking operation of the blowout preventer, so as to effectively reduce the labor intensity of employees, reduce operation risks, and improve work efficiency.

[0004] A Chinese patent document with publication number CN213269834 U and publication date May 25, 2021 discloses a blowout preventer group locking device, including a manual locking rod and a sprocket mechanism, wherein a first sprocket is provided on the sprocket mechanism; a second sprocket is installed at the end of the manual locking rod, and the second sprocket is connected to the first sprocket on the sprocket mechanism through a chain drive.

[0005] The BOP group locking device disclosed in the patent document adopts chain transmission, and the first sprocket drives the second sprocket to rotate, thereby driving the manual locking rod to achieve the locking and well shut-in of the BOP group. However, the load-bearing capacity is low and the transmission smoothness is poor, which affects the working stability and reliability. Utility Model Content

[0006] In order to overcome the defects of the above-mentioned prior art, the utility model provides a bevel gear transmission mechanism of a manual locking device of a blowout preventer. Compared with the cylindrical gear and worm gear in the prior art, the utility model can make the transmission ratio of the entire transmission mechanism stable, the load-bearing capacity high, the transmission smooth and stable, and the operation more stable and reliable.

[0007] The utility model is realized by the following technical solutions:

[0008] A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel, and is characterized in that it also comprises an input transmission box, an output transmission box, a mounting seat, a telescopic output shaft and a vibration-damping coupling, the input transmission box comprises an input gear box, an input shaft and a first connecting cylinder, the first connecting cylinder is fixed to the input gear box, one end of the input shaft is connected to the input gear box, and the other end of the input shaft is connected to the handwheel, the output transmission box comprises a transmission gear box, an output gear box, a first transmission shaft, a second transmission shaft and a second connecting cylinder, one end of the first transmission shaft is connected to the input gear box slipper, the other end of the first transmission shaft is connected to the transmission gear box slipper, the transmission gear box is connected to the output gear box through the second connecting cylinder, the transmission gear box is connected to the second transmission shaft slipper, the output gear box is fixed to the mounting seat, one end of the telescopic output shaft is connected to the output gear box, and the other end of the telescopic output shaft is connected to the vibration-damping coupling.

[0009] The input gearbox includes a first bevel gear and a second bevel gear, and the first bevel gear and the second bevel gear are vertically connected.

[0010] The transmission gear box comprises a third bevel gear and a fourth bevel gear, and the third bevel gear and the fourth bevel gear are vertically connected.

[0011] The output gear box comprises a fifth bevel gear and a sixth bevel gear, and the fifth bevel gear and the sixth bevel gear are vertically connected.

[0012] The torque of the input transmission box is 5-160N.m, and the torque of the output transmission box is 7.5-240N.m.

[0013] The telescopic output shaft comprises an outer sleeve, a spline shaft and an inner spline flange. One end of the spline shaft is connected to the outer sleeve, and the other end is connected to the inner spline flange.

[0014] The telescopic output shaft is respectively connected with the output gear box and the vibration-damping coupling by key.

[0015] The input shaft is key-connected with the first bevel gear of the input gear box, and the second bevel gear is loosely connected with the first transmission shaft.

[0016] The third bevel gear is loosely connected to the first transmission shaft and the second transmission shaft respectively.

[0017] The fourth bevel gear is connected to the first transmission shaft and the second transmission shaft respectively, and the second transmission shaft is connected to the fifth bevel gear.

[0018] The beneficial effects of the utility model are mainly manifested in the following aspects:

[0019] 1. The utility model, the input transmission box includes an input gear box, an input shaft and a first connecting cylinder, the first connecting cylinder is fixed on the input gear box, one end of the input shaft is connected to the input gear box, and the other end of the input shaft is connected to the hand wheel, the output transmission box includes a transmission gear box, an output gear box, a first transmission shaft, a second transmission shaft and a second connecting cylinder, one end of the first transmission shaft is connected to the input gear box loose sleeve, the other end of the first transmission shaft is connected to the transmission gear box loose sleeve, the transmission gear box and the output gear box are connected through the second connecting cylinder, the transmission gear box is connected to the second transmission shaft loose sleeve, the output gear box is fixed on the mounting seat, one end of the telescopic output shaft is connected to the output gear box, and the other end of the telescopic output shaft is connected to the vibration-damping coupling. Compared with the cylindrical gear and worm gear in the prior art, the transmission ratio of the entire transmission mechanism is stable, the load-bearing capacity is high, the transmission is smooth and the operation is more stable and reliable.

[0020] 2. Compared with the existing blowout preventer chain transmission method, the utility model transmits power to the input transmission box by rotating the operating hand wheel clockwise. Driven by the first transmission shaft, this movement is input into the transmission gear box, and then transmitted to the output gear box, and then the power is input into the telescopic output shaft, so that the telescopic output shaft moves forward, thereby realizing the locking of the blowout preventer, and the locking reliability is high.

[0021] 3. The utility model has the characteristics of high load-bearing capacity, good centering and guiding performance, and has good applicability.

[0022] 4. The utility model specifically adopts a bevel gear structure, which has the characteristics of compact structure, space saving, wear resistance, long service life and low noise.

[0023] 5. In the utility model, the telescopic output shaft comprises an outer sleeve, a spline shaft and an inner spline flange. One end of the spline shaft is connected to the outer sleeve, and the other end is connected to the inner spline flange. This enables the vertical height of the locking rods at different heights to be adjusted, which saves time and effort and is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementations, wherein:

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 It is an exploded view of the input transmission box of the utility model;

[0027] Figure 3 It is an exploded view of the transmission gearbox of the utility model;

[0028] Figure 4 It is an exploded view of the output transmission box of the utility model;

[0029] Figure 5 It is an exploded view of the telescopic output shaft of the utility model;

[0030] Markings in the figure: 1. handwheel, 2. input gearbox, 3. first transmission shaft, 4. transmission gearbox, 5. output gearbox, 6. mounting seat, 7. telescopic output shaft, 8. vibration damping coupling, 9. input shaft, 10. first connecting cylinder, 11. first bevel gear, 12. second bevel gear, 13. third bevel gear, 14. fourth bevel gear, 15. second connecting cylinder, 16. second transmission shaft, 17. fifth bevel gear, 18. sixth bevel gear, 19. outer cylinder sleeve, 20. spline shaft, 21. inner spline flange. DETAILED DESCRIPTION

[0031] Example 1

[0032] See also Figure 1-Figure 3 A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel 1, an input transmission box, an output transmission box, a mounting seat 6, a telescopic output shaft 7 and a vibration-damping coupling 8, wherein the input transmission box comprises an input gearbox 2, an input shaft 9 and a first connecting cylinder 10, the first connecting cylinder 10 is fixed to the input gearbox 2, one end of the input shaft 9 is connected to the input gearbox 2, and the other end of the input shaft 9 is connected to the handwheel 1, the output transmission box comprises a transmission gearbox 4, an output gearbox 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15, one end of the first transmission shaft 3 is connected to the input gearbox 2 in a loose sleeve, the other end of the first transmission shaft 3 is connected to the transmission gearbox 4 in a loose sleeve, the transmission gearbox 4 is connected to the output gearbox 5 through the second connecting cylinder 15, the transmission gearbox 4 is connected to the second transmission shaft 16 in a loose sleeve, the output gearbox 5 is fixed to the mounting seat 6, one end of the telescopic output shaft 7 is connected to the output gearbox 5, and the other end of the telescopic output shaft 7 is connected to the vibration-damping coupling 8.

[0033] This embodiment is the most basic implementation method. The input transmission box includes an input gear box 2, an input shaft 9 and a first connecting cylinder 10. The first connecting cylinder 10 is fixed on the input gear box 2. One end of the input shaft 9 is connected to the input gear box 2, and the other end of the input shaft 9 is connected to the hand wheel 1. The output transmission box includes a transmission gear box 4, an output gear box 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15. One end of the first transmission shaft 3 is connected to the input gear box 2 in a loose sleeve, and the other end of the first transmission shaft 3 is connected to the transmission gear box 4 in a loose sleeve. The transmission gear box 4 is connected to the output gear box 5 through the second connecting cylinder 15. The transmission gear box 4 is connected to the second transmission shaft 16 in a loose sleeve. The output gear box 5 is fixed on the mounting seat 6. One end of the telescopic output shaft 7 is connected to the output gear box 5, and the other end of the telescopic output shaft 7 is connected to the vibration damping coupling 8. Compared with the cylindrical gear and worm gear in the prior art, the transmission ratio of the entire transmission mechanism is stable, the load-bearing capacity is high, the transmission is smooth and the operation is more stable and reliable.

[0034] Example 2

[0035] See also Figure 1-Figure 4 A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel 1, an input transmission box, an output transmission box, a mounting seat 6, a telescopic output shaft 7 and a vibration-damping coupling 8, wherein the input transmission box comprises an input gearbox 2, an input shaft 9 and a first connecting cylinder 10, the first connecting cylinder 10 is fixed to the input gearbox 2, one end of the input shaft 9 is connected to the input gearbox 2, and the other end of the input shaft 9 is connected to the handwheel 1, the output transmission box comprises a transmission gearbox 4, an output gearbox 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15, one end of the first transmission shaft 3 is connected to the input gearbox 2 in a loose sleeve, the other end of the first transmission shaft 3 is connected to the transmission gearbox 4 in a loose sleeve, the transmission gearbox 4 is connected to the output gearbox 5 through the second connecting cylinder 15, the transmission gearbox 4 is connected to the second transmission shaft 16 in a loose sleeve, the output gearbox 5 is fixed to the mounting seat 6, one end of the telescopic output shaft 7 is connected to the output gearbox 5, and the other end of the telescopic output shaft 7 is connected to the vibration-damping coupling 8.

[0036] Preferably, the input gearbox 2 includes a first bevel gear 11 and a second bevel gear 12, and the first bevel gear 11 and the second bevel gear 12 are vertically connected.

[0037] The transmission gear box 4 includes a third bevel gear 13 and a fourth bevel gear 14, and the third bevel gear 13 and the fourth bevel gear 14 are vertically connected.

[0038] The output gearbox 5 includes a fifth bevel gear 17 and a sixth bevel gear 18 , and the fifth bevel gear 17 and the sixth bevel gear 18 are vertically connected.

[0039] This embodiment is a preferred implementation mode. Compared with the existing blowout preventer chain transmission mode, the power is transmitted to the input transmission box by rotating the operating hand wheel 1 clockwise. Driven by the first transmission shaft 3, this movement is input to the transmission gear box 4, and then transmitted to the output gear box 5, and then the power is input to the telescopic output shaft 7, so that the telescopic output shaft 7 moves forward, thereby realizing the locking of the blowout preventer, and the locking reliability is high.

[0040] Example 3

[0041] See also Figure 1-Figure 5 A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel 1, an input transmission box, an output transmission box, a mounting seat 6, a telescopic output shaft 7 and a vibration-damping coupling 8, wherein the input transmission box comprises an input gearbox 2, an input shaft 9 and a first connecting cylinder 10, the first connecting cylinder 10 is fixed to the input gearbox 2, one end of the input shaft 9 is connected to the input gearbox 2, and the other end of the input shaft 9 is connected to the handwheel 1, the output transmission box comprises a transmission gearbox 4, an output gearbox 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15, one end of the first transmission shaft 3 is connected to the input gearbox 2 in a loose sleeve, the other end of the first transmission shaft 3 is connected to the transmission gearbox 4 in a loose sleeve, the transmission gearbox 4 is connected to the output gearbox 5 through the second connecting cylinder 15, the transmission gearbox 4 is connected to the second transmission shaft 16 in a loose sleeve, the output gearbox 5 is fixed to the mounting seat 6, one end of the telescopic output shaft 7 is connected to the output gearbox 5, and the other end of the telescopic output shaft 7 is connected to the vibration-damping coupling 8.

[0042] The input gearbox 2 includes a first bevel gear 11 and a second bevel gear 12 , and the first bevel gear 11 and the second bevel gear 12 are vertically connected.

[0043] The transmission gear box 4 includes a third bevel gear 13 and a fourth bevel gear 14, and the third bevel gear 13 and the fourth bevel gear 14 are vertically connected.

[0044] The output gearbox 5 includes a fifth bevel gear 17 and a sixth bevel gear 18 , and the fifth bevel gear 17 and the sixth bevel gear 18 are vertically connected.

[0045] The torque of the input transmission box is 5N.m, and the torque of the output transmission box is 7.5N.m.

[0046] Further preferably, the telescopic output shaft 7 includes an outer sleeve 19 , a spline shaft 20 and an inner spline flange 21 , one end of the spline shaft 20 is connected to the outer sleeve 19 , and the other end is connected to the inner spline flange 21 .

[0047] This embodiment is another preferred implementation method, which has the characteristics of high load-bearing capacity, good centering and guiding performance, and has good applicability.

[0048] Example 4

[0049] See also Figure 1-Figure 5 A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel 1, an input transmission box, an output transmission box, a mounting seat 6, a telescopic output shaft 7 and a vibration-damping coupling 8, wherein the input transmission box comprises an input gearbox 2, an input shaft 9 and a first connecting cylinder 10, the first connecting cylinder 10 is fixed to the input gearbox 2, one end of the input shaft 9 is connected to the input gearbox 2, and the other end of the input shaft 9 is connected to the handwheel 1, the output transmission box comprises a transmission gearbox 4, an output gearbox 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15, one end of the first transmission shaft 3 is connected to the input gearbox 2 in a loose sleeve, the other end of the first transmission shaft 3 is connected to the transmission gearbox 4 in a loose sleeve, the transmission gearbox 4 is connected to the output gearbox 5 through the second connecting cylinder 15, the transmission gearbox 4 is connected to the second transmission shaft 16 in a loose sleeve, the output gearbox 5 is fixed to the mounting seat 6, one end of the telescopic output shaft 7 is connected to the output gearbox 5, and the other end of the telescopic output shaft 7 is connected to the vibration-damping coupling 8.

[0050] The input gearbox 2 includes a first bevel gear 11 and a second bevel gear 12 , and the first bevel gear 11 and the second bevel gear 12 are vertically connected.

[0051] The transmission gear box 4 includes a third bevel gear 13 and a fourth bevel gear 14, and the third bevel gear 13 and the fourth bevel gear 14 are vertically connected.

[0052] The output gearbox 5 includes a fifth bevel gear 17 and a sixth bevel gear 18 , and the fifth bevel gear 17 and the sixth bevel gear 18 are vertically connected.

[0053] The torque of the input transmission box is 80N.m, and the torque of the output transmission box is 120N.m.

[0054] The telescopic output shaft 7 includes an outer sleeve 19 , a spline shaft 20 and an inner spline flange 21 . One end of the spline shaft 20 is connected to the outer sleeve 19 , and the other end is connected to the inner spline flange 21 .

[0055] The telescopic output shaft 7 is key-connected with the output gear box 5 and the damping coupling 8 respectively.

[0056] The input shaft 9 is key-connected with the first bevel gear 11 of the input gear box 2 , and the second bevel gear 12 is loosely connected with the first transmission shaft 3 .

[0057] This embodiment is another preferred implementation method, which specifically adopts a bevel gear structure and has the characteristics of compact structure, space saving, wear resistance, long service life and low noise.

[0058] Example 5

[0059] See also Figure 1-Figure 5 A bevel gear transmission mechanism of a manual locking device of a blowout preventer comprises a handwheel 1, an input transmission box, an output transmission box, a mounting seat 6, a telescopic output shaft 7 and a vibration-damping coupling 8, wherein the input transmission box comprises an input gearbox 2, an input shaft 9 and a first connecting cylinder 10, the first connecting cylinder 10 is fixed to the input gearbox 2, one end of the input shaft 9 is connected to the input gearbox 2, and the other end of the input shaft 9 is connected to the handwheel 1, the output transmission box comprises a transmission gearbox 4, an output gearbox 5, a first transmission shaft 3, a second transmission shaft 16 and a second connecting cylinder 15, one end of the first transmission shaft 3 is connected to the input gearbox 2 in a loose sleeve, the other end of the first transmission shaft 3 is connected to the transmission gearbox 4 in a loose sleeve, the transmission gearbox 4 is connected to the output gearbox 5 through the second connecting cylinder 15, the transmission gearbox 4 is connected to the second transmission shaft 16 in a loose sleeve, the output gearbox 5 is fixed to the mounting seat 6, one end of the telescopic output shaft 7 is connected to the output gearbox 5, and the other end of the telescopic output shaft 7 is connected to the vibration-damping coupling 8.

[0060] The input gearbox 2 includes a first bevel gear 11 and a second bevel gear 12 , and the first bevel gear 11 and the second bevel gear 12 are vertically connected.

[0061] The transmission gear box 4 includes a third bevel gear 13 and a fourth bevel gear 14, and the third bevel gear 13 and the fourth bevel gear 14 are vertically connected.

[0062] The output gearbox 5 includes a fifth bevel gear 17 and a sixth bevel gear 18 , and the fifth bevel gear 17 and the sixth bevel gear 18 are vertically connected.

[0063] The torque of the input transmission box is 160N.m, and the torque of the output transmission box is 240N.m.

[0064] The telescopic output shaft 7 includes an outer sleeve 19 , a spline shaft 20 and an inner spline flange 21 . One end of the spline shaft 20 is connected to the outer sleeve 19 , and the other end is connected to the inner spline flange 21 .

[0065] The telescopic output shaft 7 is key-connected with the output gear box 5 and the damping coupling 8 respectively.

[0066] More preferably, the input shaft 9 is key-connected with the first bevel gear 11 of the input gear box 2 , and the second bevel gear 12 is loosely connected with the first transmission shaft 3 .

[0067] The third bevel gear 13 is loosely connected to the first transmission shaft 3 and the second transmission shaft 16 respectively.

[0068] The fourth bevel gear 14 is connected to the first transmission shaft 3 and the second transmission shaft 16 respectively, and the second transmission shaft 16 is connected to the fifth bevel gear 17 .

[0069] This embodiment is the best implementation method. The telescopic output shaft 7 includes an outer sleeve 19, a spline shaft 20 and an inner spline flange 21. One end of the spline shaft 20 is connected to the outer sleeve 19, and the other end is connected to the inner spline flange 21. It can adjust the vertical height of the locking rods at different heights, which saves time and effort and is more convenient.

[0070] The working process of the utility model for locking the blowout preventer is as follows:

[0071] By rotating the operating hand wheel 1 clockwise, the power is transmitted to the input transmission box. Driven by the first transmission shaft 3, this movement is input to the transmission gear box 4, and then transmitted to the output gear box 5, and then the power is input to the telescopic output shaft 7, so that the telescopic output shaft 7 moves forward, thereby locking the blowout preventer.

Claims

1. A bevel gear transmission mechanism of a manual locking device for a blowout preventer, comprising a hand wheel (1), characterized in that: The invention also comprises an input transmission box, an output transmission box, a mounting seat (6), a telescopic output shaft (7) and a vibration-damping coupling (8); the input transmission box comprises an input gear box (2), an input shaft (9) and a first connecting cylinder (10); the first connecting cylinder (10) is fixed to the input gear box (2); one end of the input shaft (9) is connected to the input gear box (2); the other end of the input shaft (9) is connected to the hand wheel (1); the output transmission box comprises a transmission gear box (4), an output gear box (5), a first transmission shaft (3), a second transmission shaft (16) and a second A connecting cylinder (15), one end of the first transmission shaft (3) is connected to the input gear box (2) by a loose sleeve, the other end of the first transmission shaft (3) is connected to the transmission gear box (4) by a loose sleeve, the transmission gear box (4) is connected to the output gear box (5) by a second connecting cylinder (15), the transmission gear box (4) is connected to the second transmission shaft (16) by a loose sleeve, the output gear box (5) is fixed on the mounting seat (6), one end of the telescopic output shaft (7) is connected to the output gear box (5), and the other end of the telescopic output shaft (7) is connected to the vibration damping coupling (8).

2. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 1, characterized in that: The input gearbox (2) comprises a first bevel gear (11) and a second bevel gear (12), and the first bevel gear (11) and the second bevel gear (12) are vertically connected.

3. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 1, characterized in that: The transmission gear box (4) comprises a third bevel gear (13) and a fourth bevel gear (14), and the third bevel gear (13) and the fourth bevel gear (14) are vertically connected.

4. The bevel gear transmission mechanism of the manual locking device for a blowout preventer according to claim 3, characterized in that: The output gearbox (5) comprises a fifth bevel gear (17) and a sixth bevel gear (18), and the fifth bevel gear (17) and the sixth bevel gear (18) are vertically connected.

5. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 1, characterized in that: The torque of the input transmission box is 5-160N.m, and the torque of the output transmission box is 7.5-240N.m.

6. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 1, characterized in that: The telescopic output shaft (7) comprises an outer sleeve (19), a spline shaft (20) and an inner spline flange (21); one end of the spline shaft (20) is connected to the outer sleeve (19), and the other end is connected to the inner spline flange (21).

7. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 1, characterized in that: The telescopic output shaft (7) is key-connected to the output gear box (5) and the vibration-damping coupling (8) respectively.

8. The bevel gear transmission mechanism of the manual locking device for a blowout preventer according to claim 2, characterized in that: The input shaft (9) is key-connected to the first bevel gear (11) of the input gear box (2), and the second bevel gear (12) is loosely connected to the first transmission shaft (3).

9. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 3, characterized in that: The third bevel gear (13) is respectively connected to the first transmission shaft (3) and the second transmission shaft (16) in a loose connection.

10. The bevel gear transmission mechanism of the manual locking device of a blowout preventer according to claim 4, characterized in that: The fourth bevel gear (14) is connected to the first transmission shaft (3) and the second transmission shaft (16) respectively, and the second transmission shaft (16) is connected to the fifth bevel gear (17).

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