CN219119727U - Planetary reduction power head with braking mechanism - Google Patents

Abstract

The utility model discloses a planetary reduction power head with a braking mechanism, which comprises a power head box and a speed reducer shell, wherein the lower end of the speed reducer shell is provided with a braking input mechanism, and the lower end of the braking input mechanism is provided with a planetary reduction mechanism; the brake input mechanism comprises an input end, a separation sheet, a friction sheet, a brake part and a separation part, wherein the friction sheet is in transmission connection with the input end and moves in the axial direction of the input end, the separation sheet is in sliding connection with the speed reducer shell, and the separation sheet moves in the axial direction of the input end. The utility model has the beneficial effects that the input end can be actively braked by the action of the brake part, so that the time from rotation to rest is greatly shortened, and the time for replacing the drill rod is reduced; through the effect of the separation part, the separation sheet is prevented from contacting with the friction sheet when the input end rotates normally, and the rotating resistance of the input end is reduced.

Description

Planetary reduction power head with braking mechanism

Technical Field

The utility model relates to the technical field of reverse circulation drilling machine power heads, in particular to a planetary reduction power head with a braking mechanism.

Background

A newer model in the rotary drilling machine, its power head can reciprocate in the range of giving the journey along the guide rail of the fuselage, a kind of common one is the full hydraulic power head type drilling machine, its characteristic is as the hydraulic motor of the rotary power machine and power head are connected into an organic whole;

the existing power head is provided with an input part, an output part and a speed reduction part, however, the drill rod or other rotating parts need to be actively decelerated during actual drilling, the existing power head is not provided with a braking mechanism, and the existing power head has the following defects; 1. the lack of a braking mechanism can only stop by means of self-running resistance, so that the time from rotation to rest is increased, and the time for replacing a drill rod is prolonged; yet another condition is that a rapid reduction in rotational speed is required when the drill bit is drilling into hard rock.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a planetary reduction power head with a brake mechanism;

in order to achieve the above object, the present utility model adopts the following technical scheme; the device comprises a power head box and a speed reducer shell, wherein the speed reducer shell is fixedly connected with the power head box, a brake input mechanism is arranged at the lower end of the speed reducer shell, and a planetary speed reducing mechanism is arranged at the lower end of the brake input mechanism;

the brake input mechanism comprises an input end, a separation sheet, a friction sheet, a brake part and a separation part, wherein the friction sheet is in transmission connection with the input end, the friction sheet moves in the axial direction of the input end, the separation sheet is in sliding connection with a speed reducer shell, the separation sheet moves in the axial direction of the input end, the brake part can press the separation sheet and the friction sheet, and the separation part separates the separation sheet from the friction sheet;

the planetary reduction mechanism comprises an input shaft, an output box and a reduction gear set, wherein the input shaft transmits power to the output box through the reduction gear set, and the input shaft is fixedly connected with the input end.

Further, the separation sheets and the friction sheets are arranged in a plurality of alternate ways, the input ends are connecting sleeves, the braking part comprises a separation plate arranged at the lower end of a speed reducer shell, the lower end of the speed reducer shell is provided with a first cavity, the upper end of the speed reducer shell is provided with a second cavity, the lower end of the cavity is provided with a compression ring, the compression ring is provided with a cylindrical groove, a clamp spring I is arranged at the inner side of the first cavity, a compression spring I is arranged at the lower end of the clamp spring, the compression spring I presses the compression ring, and the compression ring compresses the friction sheets; the brake part further comprises a spline groove I which is formed in the side surface of the connecting sleeve, a friction plate is in sliding connection with the spline groove I, a spline groove II is formed in the side wall of the first cavity, a separation plate is in sliding connection with the spline groove II, the friction plate and the separation plate are located in the cavity II, a bearing I is mounted at the lower end of the cavity II, and the connecting sleeve is fixedly connected with an inner ring of the bearing I; an oil way is formed in the speed reducer shell and is communicated with the first cavity and the outside, and one end of the oil way is located below the compression ring.

Further, the partition part comprises a rectangular groove which is formed in the side wall of the cavity, a compression spring II is arranged on one side of the rectangular groove, one end of the compression spring II is fixedly connected with the rectangular groove, a vertical plate is arranged on the other end of the compression spring II, a triangular plate is arranged on one side of the vertical plate, a gap is formed in the adjacent surface of the partition plate and the adjacent surface of the friction plate, the gap is surrounded to form a triangle, and the triangular plate corresponds to the triangle in position.

Further, a ball bearing is arranged on the outer side of the speed reducer shell, a connecting flange is arranged on the outer ring of the ball bearing, the output box is fixedly connected with the connecting flange, and the input shaft is fixedly connected with the connecting sleeve; the speed reducing wheel sets are provided with a plurality of groups.

Further, the speed reduction wheelset includes one-level sun gear, one-level planet carrier, one-level planet wheel and ring gear one, ring gear one and output case fixed connection, one-level sun gear and input shaft fixed connection, one-level planet carrier and output case sliding connection, one-level planet wheel installs in one-level planet carrier one side, one-level planet wheel one side and ring gear one meshing opposite side and one-level sun gear meshing, one-level planet carrier upper end installs transmission tooth one.

Further, the speed reduction wheel set comprises a second-level sun wheel, a second-level planet carrier, a second-level planet wheel and a second toothed ring, and the second toothed ring is fixedly connected with the output box; the input shaft penetrates through the secondary sun gear, the first transmission gear is meshed with the secondary sun gear, the secondary planet carrier is in sliding connection with the output box, the secondary planet gear is arranged on one side of the secondary planet carrier, and one side of the secondary planet gear is meshed with the second gear ring while the other side of the secondary planet gear is meshed with the secondary sun gear; and a second transmission gear is arranged at the upper end of the second-stage planet carrier.

Further, the speed reduction wheelset includes tertiary sun gear, tertiary planet carrier, tertiary planet wheel, tertiary sun gear establishes in second grade sun gear upper end, tertiary planet carrier and output box rotatable coupling, tertiary planet wheel installs in tertiary planet carrier one side, tertiary planet wheel one side and the meshing opposite side of ring gear two and tertiary sun gear meshing.

Furthermore, a bearing III is arranged at the lower end of the power head box, a connecting shaft is arranged at the inner ring of the bearing III, the upper end of the connecting shaft is fixedly connected with the output box, and output teeth are arranged on the side surface of the output box.

Further, the connector is installed to the unit head case upper end, and the pump body is installed to the connector upper end, installs the impeller in the pump body, be equipped with the gyration support in the unit head case, the hollow shaft is installed to the gyration support lower extreme, and the combination is sealed is installed to the hollow shaft inboard, and the slow rod flange is installed to hollow shaft lower extreme, the power motor is installed to unit head case one side, the power motor output inserts the input, the unit head gland is installed to unit head case lower extreme.

Compared with the prior art, the technical scheme has the following beneficial effects: the input end can be actively braked through the action of the brake part, so that the time from rotation to rest is greatly shortened, and the time for replacing the drill rod is shortened; or under another working condition, the rotating speed of the drill bit can be rapidly reduced, so that the damage of the hard rock layer to the drill bit is avoided;

through the effect of the separation part, the separation sheet is prevented from contacting with the friction sheet when the input end rotates normally, and the rotating resistance of the input end is reduced.

Drawings

FIG. 1 is a schematic diagram of a planetary reduction power head with a brake mechanism according to the present utility model;

FIG. 2 is a schematic view of a brake portion of the present utility model;

FIG. 3 is a schematic view of a divider of the present utility model;

FIG. 4 is a schematic view of a separator sheet of the present utility model;

FIG. 5 is a schematic view of a friction plate of the present utility model;

FIG. 6 is a schematic view of a pump body of the present utility model;

in the figure, 1, a power head box; 2. a speed reducer housing; 3. an input end; 4. a separator sheet; 5. a friction plate; 6. a braking section; 7. a partition portion; 8. an input shaft; 9. an output box; 10. a speed reducing wheel set; 11. a partition plate; 12. a first cavity; 13. a cavity II; 14. a compression ring; 15. a cylindrical groove; 16. a clamp spring I; 18. compressing a first spring; 19. spline groove I; 20. spline groove II; 21. a first bearing; 22. rectangular grooves; 23. compression spring II; 24. a riser; 25. triangular plates; 26. a notch; 27. triangle; 28. a ball bearing; 29. a connecting flange; 30. a first-stage sun gear; 31. a primary planet carrier; 32. a first-stage planet wheel; 33. a first toothed ring; 34. a first transmission gear; 35. a secondary sun gear; 36. a secondary planet carrier; 37. a second-stage planetary gear; 38. a second toothed ring; 39. a second transmission gear; 40. three-stage sun gears; 41. a third-stage planet carrier; 42. three-stage planet gears; 43. a third bearing; 44. a connecting shaft; 45. an output tooth; 46. connecting sleeves; 47. an oil path; 48. an impeller; 49. a connecting body; 50. a rotary support; 51. sealing in a combined way; 52. a power head gland; 53. a slow rod flange; 54. hollow shaft; 55. a power motor; 56. a pump body.

Description of the embodiments

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

The embodiment of the application provides a planetary reduction power head with a braking mechanism, please refer to fig. 1-5: the device comprises a power head box 1 and a speed reducer shell 2, wherein the speed reducer shell 2 is fixedly connected with the power head box 1, a brake input mechanism is arranged at the lower end of the speed reducer shell 2, and a planetary speed reduction mechanism is arranged at the lower end of the brake input mechanism;

the brake input mechanism comprises an input end 3, a separation plate 4, a friction plate 5, a brake part 6 and a separation part 7, wherein the friction plate 5 is in transmission connection with the input end 3, the friction plate 5 moves in the axial direction of the input end 3, the separation plate 4 is in sliding connection with the speed reducer shell 2, the separation plate 4 moves in the axial direction of the input end 3, the brake part 6 can press the separation plate 4 and the friction plate 5, and the separation part 7 separates the separation plate 4 from the friction plate 5;

the planetary reduction mechanism comprises an input shaft 8, an output box 9 and a reduction gear set 10, wherein the input shaft 8 transmits power to the output box 9 through the reduction gear set 10, and the input shaft 8 is fixedly connected with the input end 3.

In practical application, the device can be used for reverse circulation drilling and forward circulation drilling (the original similar power head is only used in forward circulation), the output end of a hydraulic speed reducer or a motor is inserted into the input end 3 during working, the input end rotates to drive the input shaft 8 and the first-stage sun gear 30 to rotate, the rotation of the first-stage sun gear 30 can drive each speed reduction wheel set 10 to rotate, and finally, power is output from the output teeth 45, so that the purpose of driving the drill rod to rotate is realized;

when the input end 3 is required to be braked, an external hydraulic system is controlled to pump hydraulic oil out of the oil way 47, the compression ring 14 and the first cavity 12, the compression ring 14 can be pressed against the friction plate 5 through the action of the braking part 6, and the power required by braking can be provided through the friction force between the friction plate 5 and the separation plate 4;

by the action of the partition 7, when the partition 4 and the friction plate 5 are separated, a gap is formed between the partition and the friction plate, so that the friction plate 5 is prevented from being pressed on the partition 4, and the action of the power head is prevented from being blocked.

Referring to fig. 1, fig. 2, fig. 4 and fig. 5 of the specification, the separation sheet 4 and the friction sheet 5 are provided with a plurality of alternately arranged separation sheets, the input end 3 is a connecting sleeve 46, the braking part 6 comprises a separation plate 11 arranged at the lower end of the speed reducer shell 2, the lower end of the speed reducer shell 2 is provided with a first cavity 12, the upper end of the speed reducer shell 2 is provided with a second cavity 13, the lower end of the first cavity 12 is provided with a compression ring 14, the compression ring 14 is provided with a cylindrical groove 15, a first clamping spring 16 is arranged at the inner side of the first cavity 12, a first compression spring 18 is arranged at the lower end of the first clamping spring 16, the first compression spring 18 is propped against the compression ring 14, and the compression ring 14 is used for compressing the friction sheet 5; the braking part 6 further comprises a spline groove I19 formed in the side surface of the connecting sleeve 46, the friction plate 5 is in sliding connection with the spline groove I19, a spline groove II 20 is formed in the side wall of the first cavity 12, the separation plate 4 is in sliding connection with the spline groove II 20, the friction plate 5 and the separation plate 4 are positioned in the second cavity 13, a first bearing 21 is arranged at the lower end of the second cavity 13, and the connecting sleeve 46 is fixedly connected with the inner ring of the first bearing 21; an oil way 47 is formed in the speed reducer shell 2, the oil way 47 is communicated with the first cavity 12 and the outside, and one end of the oil way 47 is located below the pressing ring 14.

In practical application, when braking is needed, an external hydraulic system is controlled to draw hydraulic oil out of a gap between the cavity I12 and the compression ring 14 through an oil way 47, the friction plate 5 and the separation plate 4 can be compressed through the elasticity of the compression spring I18, the friction plate 5 and the separation plate 4 have a relatively static trend through the friction force between the friction plate 5 and the separation plate 4, and the friction force can be transmitted to an input end through the structure of sliding connection of the separation plate 4 and the spline groove II 20 and sliding connection of the friction plate 5 and the spline groove I19, so that the purpose of braking is realized;

when braking is not needed, the external hydraulic system is controlled to inject hydraulic oil into the gap between the first cavity 12 and the pressing ring 14 through the oil way 47, the pressing ring 14 is jacked up by the pressure generated by the hydraulic oil, the first compression spring 18 is compressed at the moment, the pressing ring 14 is not contacted with the friction plate 5, and the pressing ring is in a state capable of oppositely rotating, so that the power of the input end 3 can be smoothly transmitted to the output box 9.

Referring to fig. 1 of the specification, fig. 2 of the specification and fig. 3 of the specification, the partition 7 comprises a rectangular groove 22 formed in the side wall of the cavity II 13, a compression spring II 23 is installed on one side of the rectangular groove 22, one end of the compression spring II 23 is fixedly connected with the rectangular groove 22, a vertical plate 24 is installed on the other end of the compression spring II 23, a triangular plate 25 is formed on one side of the vertical plate 24, a notch 26 is formed in the surface, adjacent to the friction plate 5, of the partition plate 4, the notch 26 is surrounded to form a triangle 27, and the triangular plate 25 corresponds to the triangle 27 in position.

In practical application, when the compression ring 14 moves upwards, the vertical plate 24 and the triangular plate 25 can move to the triangular plate 27 by the elasticity of the compression spring II 23, the friction plate 5 and the separation plate 4 can be in a non-contact state by the guiding action of the notch 26, and the friction plate 5 and the separation plate 4 are prevented from being stacked together due to gravity, so that unnecessary friction force is avoided.

Referring to the accompanying drawings 1, 2, 3 and 4, a ball bearing 28 is arranged on the outer side of a speed reducer shell 2, a connecting flange 29 is arranged on the outer ring of the ball bearing 28, an output box 9 is fixedly connected with the connecting flange 29, and an input shaft 8 is fixedly connected with a connecting sleeve 46; the speed reducing wheel sets 10 are provided with a plurality of groups.

In particular, in practice, the output box 9 is rotated (the reducer housing 2 is in a relatively stationary state) by the action of the ball bearings 28 and the connecting flange 29,

referring to fig. 1 of the specification and fig. 2 of the specification, the reduction gear set 10 includes a first-stage sun gear 30, a first-stage planet carrier 31, a first-stage planet gear 32 and a first toothed ring 33, the first toothed ring 33 is fixedly connected with the output box 9, the first-stage sun gear 30 is fixedly connected with the input shaft 8, the first-stage planet carrier 31 is slidably connected with the output box 9, the first-stage planet gear 32 is mounted on one side of the first-stage planet carrier 31, one side of the first-stage planet gear 32 is meshed with the first-stage sun gear 30 on the other side of the first-stage planet gear 32, and a first transmission gear 34 is mounted on the upper end of the first-stage planet carrier 31.

In practical application, the connecting sleeve 46 rotates to drive the primary sun gear 30 to rotate, the primary sun gear 30 drives the primary planet gear 32 to rotate, and the primary planet gear 32 revolves while rotating by the action that one side of the primary planet gear 32 is meshed with the first gear ring 33 and the other side is meshed with the primary sun gear 30, and the primary planet gear 31 drives the first transmission gear 34 to rotate.

Referring to fig. 1 and 2 of the specification, the reduction gear set 10 includes a secondary sun gear 35, a secondary planet carrier 36, a secondary planet wheel 37 and a second gear ring 38, and the second gear ring 38 is fixedly connected with the output box 9; the input shaft 8 passes through the secondary sun gear 35, the first transmission gear 34 is meshed with the secondary sun gear 35, the secondary planet carrier 36 is in sliding connection with the output box 9, the secondary planet gear 37 is arranged on one side of the secondary planet carrier 36, one side of the secondary planet gear 37 is meshed with the second gear ring 38, and the other side of the secondary planet gear 37 is meshed with the secondary sun gear 35; the upper end of the secondary planet carrier 36 is provided with a second transmission gear 39.

In practical application, the first transmission gear 34 rotates to drive the second sun gear 35 to rotate, the second sun gear 35 rotates to drive the second planet gears 37 to rotate, the second planet gears 37 revolve while rotating, the second planet gears 37 revolve to drive the second planet carrier 36 to rotate, and the second planet carrier 36 drives the second transmission gear 39 to rotate.

Referring to fig. 1 of the specification and fig. 2 of the specification, the speed reduction wheel set 10 comprises a three-stage sun gear 40, a three-stage planet carrier 41 and three-stage planet gears 42, wherein the three-stage sun gear 40 is arranged at the upper end of the second-stage sun gear 35, the three-stage planet carrier 41 is rotatably connected with the output box 9, the three-stage planet gears 42 are arranged on one side of the three-stage planet carrier 41, and one side of the three-stage planet gears 42 is meshed with the toothed ring II 38 while the other side is meshed with the three-stage sun gear 40.

In practical application, the second transmission gear 39 rotates to drive the third-stage sun gear 40 to rotate, the third-stage sun gear 40 rotates to drive the third-stage planet gears 42 to rotate, at this time, the third-stage planet carrier 41 is meshed with the speed reducer housing 2, the third-stage planet gears 42 only rotate, and the third-stage planet gears 42 drive the second toothed ring 38 and the output gear 45 to rotate, so that power is output.

Referring to fig. 1 of the specification, a bearing three 43 is mounted at the lower end of the power head box 1, a connecting shaft 44 is mounted at the inner ring of the bearing three 43, the upper end of the connecting shaft 44 is fixedly connected with the output box 9, and output teeth 45 are mounted on the side surface of the output box 9.

In particular, in practical use, the output box 9 is in a stable rotation state by the action of the connecting shaft 44 and the bearing three 43.

Referring to fig. 6 of the specification, a connector 49 is installed at the upper end of the power head box 1, a pump body 56 is installed at the upper end of the connector 49, an impeller 48 is installed in the pump body 56, a rotary support 50 is arranged in the power head box 1, a hollow shaft 54 is installed at the lower end of the rotary support 50, a combined seal 51 is installed at the inner side of the hollow shaft 54, a buffer rod flange 53 is installed at the lower end of the hollow shaft 54, a power motor 55 is installed at one side of the power head box 1, the output end of the power motor 55 is inserted into the input end 3, and a power head gland 52 is installed at the lower end of the power head box 1.

In practical application, the hollow shaft 54 is in a rotatable state under the action of the rotary support 50, the hollow shaft 54 can be driven to rotate through the rotation of the output teeth 45, the hollow shaft 54 drives the lower end buffer rod flange 53 and the drill rod to rotate, and the slurry can be circulated positively or reversely under the action of the rotation of the impeller 48 and the pump body 56.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors.

Claims (9)

1. The planetary reduction power head with the braking mechanism comprises a power head box (1) and a speed reducer shell (2), wherein the speed reducer shell (2) is fixedly connected with the power head box (1), and the planetary reduction power head is characterized in that the lower end of the speed reducer shell (2) is provided with the braking input mechanism, and the lower end of the braking input mechanism is provided with the planetary reduction mechanism;

the brake input mechanism comprises an input end (3), a separation sheet (4), a friction sheet (5), a braking part (6) and a separation part (7), wherein the friction sheet (5) is in transmission connection with the input end (3), the friction sheet (5) moves in the axial direction of the input end (3), the separation sheet (4) is in sliding connection with a speed reducer shell (2), the separation sheet (4) moves in the axial direction of the input end (3), the braking part (6) can compress the separation sheet (4) and the friction sheet (5), and the separation part (7) separates the separation sheet (4) and the friction sheet (5);

the planetary reduction mechanism comprises an input shaft (8), an output box (9) and a reduction gear set (10), wherein the input shaft (8) transmits power to the output box (9) through the reduction gear set (10), and the input shaft (8) is fixedly connected with the input end (3).

2. The planetary reduction power head with the braking mechanism according to claim 1, wherein a plurality of separating sheets (4) and friction sheets (5) are arranged alternately at intervals, the input end (3) is a connecting sleeve (46), the braking part (6) comprises a separating plate (11) arranged at the lower end of a speed reducer shell (2), a cavity I (12) is arranged at the lower end of the speed reducer shell (2), a cavity II (13) is arranged at the upper end of the speed reducer shell (2), a compression ring (14) is arranged at the lower end of the cavity I (12), a cylindrical groove (15) is arranged on the compression ring (14), a clamp spring I (16) is arranged at the inner side of the cavity I (12), a compression spring I (18) is arranged at the lower end of the clamp spring I (16), the compression spring I (18) is pressed against the compression ring (14), and the compression ring (14) compresses the friction sheets (5); the braking part (6) further comprises a spline groove I (19) formed in the side surface of the connecting sleeve (46), the friction plate (5) is in sliding connection with the spline groove I (19), a spline groove II (20) is formed in the side wall of the first cavity (12), the separation plate (4) is in sliding connection with the spline groove II (20), the friction plate (5) and the separation plate (4) are located in the second cavity (13), a first bearing (21) is arranged at the lower end of the second cavity (13), and the connecting sleeve (46) is fixedly connected with the inner ring of the first bearing (21); an oil way (47) is formed in the speed reducer shell (2), the oil way (47) is communicated with the first cavity (12) and the outside, and one end of the oil way (47) is located below the compression ring (14).

3. The planetary reduction power head with the braking mechanism according to claim 2, characterized in that the separation part (7) comprises a rectangular groove (22) formed in the side wall of the second cavity (13), a second compression spring (23) is installed on one side of the rectangular groove (22), one end of the second compression spring (23) is fixedly connected with the rectangular groove (22), a vertical plate (24) is installed on the other end of the second compression spring (23), a triangular plate (25) is formed on one side of the vertical plate (24), a notch (26) is formed in the adjacent surface of the separation plate (4) and the friction plate (5), the notch (26) surrounds to form a triangle (27), and the triangular plate (25) corresponds to the triangle (27).

4. A planetary reduction power head with a braking mechanism according to claim 3, characterized in that a ball bearing (28) is installed on the outer side of the speed reducer shell (2), a connecting flange (29) is installed on the outer ring of the ball bearing (28), the output box (9) is fixedly connected with the connecting flange (29), and the input shaft (8) is fixedly connected with a connecting sleeve (46); the speed reduction wheel sets (10) are provided with a plurality of groups.

5. The planetary reduction power head with a braking mechanism according to claim 4, wherein the reduction gear set (10) comprises a first-stage sun gear (30), a first-stage planet carrier (31), a first-stage planet gear (32) and a first toothed ring (33), the first toothed ring (33) is fixedly connected with the output box (9), the first-stage sun gear (30) is fixedly connected with the input shaft (8), the first-stage planet carrier (31) is slidably connected with the output box (9), the first-stage planet gear (32) is mounted on one side of the first-stage planet carrier (31), one side of the first-stage planet gear (32) is meshed with the first-stage sun gear (30) on the other side, and a first-transmission gear (34) is mounted at the upper end of the first-stage planet carrier (31).

6. A planetary reduction power head with a braking mechanism according to claim 5, characterized in that the reduction wheel set (10) comprises a secondary sun wheel (35), a secondary planet carrier (36), a secondary planet wheel (37) and a toothed ring two (38), wherein the toothed ring two (38) is fixedly connected with an output box (9); the input shaft (8) penetrates through the secondary sun gear (35), the transmission gear I (34) is meshed with the secondary sun gear (35), the secondary planet carrier (36) is in sliding connection with the output box (9), the secondary planet wheel (37) is arranged on one side of the secondary planet carrier (36), and one side of the secondary planet wheel (37) is meshed with the gear ring II (38) while the other side is meshed with the secondary sun gear (35); the upper end of the secondary planet carrier (36) is provided with a transmission gear II (39).

7. The planetary reduction power head with the braking mechanism according to claim 6, wherein the reduction gear set (10) comprises a three-stage sun gear (40), a three-stage planet carrier (41) and three-stage planet gears (42), the three-stage sun gear (40) is arranged at the upper end of the two-stage sun gear (35), the three-stage planet carrier (41) is rotatably connected with the output box (9), the three-stage planet gears (42) are arranged on one side of the three-stage planet carrier (41), and one side of the three-stage planet gears (42) is meshed with the toothed ring II (38) while the other side is meshed with the three-stage sun gear (40).

8. The planetary reduction power head with the braking mechanism according to any one of claims 1 to 7, wherein a bearing III (43) is arranged at the lower end of the power head box (1), a connecting shaft (44) is arranged at the inner ring of the bearing III (43), the upper end of the connecting shaft (44) is fixedly connected with the output box (9), and output teeth (45) are arranged on the side surface of the output box (9).

9. The planetary reduction power head with the braking mechanism according to claim 8, further comprising a connecting body (49) arranged at the upper end of the power head box (1), wherein a pump body (56) is arranged at the upper end of the connecting body (49), an impeller (48) is arranged in the pump body (56), a rotary support (50) is arranged in the power head box (1), a hollow shaft (54) is arranged at the lower end of the rotary support (50), a combined seal (51) is arranged at the inner side of the hollow shaft (54), a buffer rod flange (53) is arranged at the lower end of the hollow shaft (54), a power motor (55) is arranged at one side of the power head box (1), an output end of the power motor (55) is inserted into the input end (3), and a power head gland (52) is arranged at the lower end of the power head box (1).

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