Double auger machine power head

Abstract

This utility model provides a power head for a dual-stage pile mixing machine, including a forward drive shaft, a reverse drive shaft sleeve, and a bevel gear assembly. The input end of the forward drive shaft is used to connect to an external power source, and the output end is provided with an inner drill rod flange for connecting to an inner drill rod. The reverse drive shaft sleeve is rotatably mounted outside the forward drive shaft via bearings. The input end of the reverse drive shaft sleeve is driven by the bevel gear assembly, and the output end is provided with an outer drill rod flange for connecting to an outer drill rod. The bevel gear assembly includes an outer frame, a bevel gear shaft, a first bevel gear, a second bevel gear, and a third bevel gear. The outer frame is rotatably engaged with the forward drive shaft and / or the reverse drive shaft sleeve via bearings. The bevel gear shaft is mounted on the outer frame and is perpendicular to the forward drive shaft. When the forward drive shaft rotates in the forward direction, it drives the reverse drive shaft sleeve to rotate in the reverse direction via the bevel gear assembly. This dual-stage pile mixing machine power head has the advantages of relatively smaller size, lighter overall weight, and limited loss of transmission power.

Description

Technical Field

[0001] This utility model relates to the field of pile driver technology, specifically to a power head for a double-stirring pile driver. Background Technology

[0002] The bidirectional mixing pile machine is a common type of pile machine used in the field of pile machines. Its characteristic is that the output drill rod is a nested drill rod structure including an inner drill rod and an outer drill rod. Driven by the power head of the dual mixing pile machine, they rotate in different directions, thereby realizing bidirectional mixing construction of the inner and outer drill rods.

[0003] Among them, the power head of the double-stirring pile machine is the key transmission mechanism. It does not have two sets of transmission systems, but achieves bidirectional transmission inside and outside under the drive of a single transmission motor.

[0004] Currently, the mainstream power head uses a planetary gear system to achieve bidirectional mixing. However, due to the space requirements of the planetary gears, this type of mixing drill naturally has a relatively large overall diameter in its gear transmission structure, which leads to an increase in the overall size of the power head. The pile driver power head often needs to be raised to a high position. Excessive size and weight can result in high energy consumption. For example, the invention patent application with application number CN202410564089.8, entitled "A Single-Shaft Mixing Drill and Construction Method for Bidirectional Mixing and Bidirectional Cutting," describes a bidirectional transmission method using planetary gears. If the size is to be reduced, the specifications of the gear system, especially the specifications of the planetary gears, must be reduced, which will lead to a decrease in external speed and a loss of power.

[0005] Based on this, those skilled in the art have been working on miniaturizing the power head while ensuring that the transmission power is not damaged too much. They are seeking new solutions to this seemingly contradictory goal.

[0006] This utility model improves upon the existing bidirectional stirring power head while minimizing the size of the power head and minimizing the loss of transmission power. Utility Model Content

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a power head for a dual-stirring pile machine that is relatively smaller in size, lighter in overall weight, and has limited loss of transmission power.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a power head for a double-stirring pile machine, comprising a forward drive shaft, a reverse drive shaft sleeve, and a bevel gear assembly;

[0009] The input end of the forward drive shaft is used to connect to external power, and the output end is provided with an inner drill rod flange for connecting the inner drill rod.

[0010] The reverse drive bushing is rotatably mounted on the outside of the forward drive shaft via a bearing. The input end of the reverse drive bushing is driven by a bevel gear assembly, and the output end is provided with an outer drill rod flange for connecting the outer drill rod.

[0011] The bevel gear assembly includes an outer frame, a bevel gear shaft, a first bevel gear, a second bevel gear, and a third bevel gear;

[0012] The outer frame is rotatably engaged with the forward drive shaft and / or the reverse drive shaft sleeve via bearings, and the bevel gear shaft is mounted on the outer frame and is perpendicular to the forward drive shaft;

[0013] The first bevel gear is fixed on the forward drive shaft, the second bevel gear is mounted on the bevel gear shaft via a bearing, and the third bevel gear is fixed on the reverse drive shaft sleeve. The first bevel gear meshes with the second bevel gear, and the second bevel gear meshes with the third bevel gear, so that when the forward drive shaft rotates in the forward direction, it drives the reverse drive shaft sleeve to rotate in the reverse direction through the bevel gear assembly.

[0014] This invention uses nested forward drive shafts in conjunction with reverse drive shaft sleeves to achieve bidirectional rotational power transmission. Only one motor input is needed to achieve bidirectional output. Moreover, in the bidirectional transmission method, bevel gears are used instead of traditional planetary gears, which eliminates the transmission constraints caused by diameter. The second bevel gear, which acts as a relay gear, is supported by an independent bevel gear shaft, making the structure more stable than the traditional structure. When transmitting large input power, it is less likely to cause power loss.

[0015] Based on the above, the diameter of the second bevel gear is smaller than the diameter of the first bevel gear and the diameter of the third bevel gear, respectively.

[0016] Under this scheme, the forward drive shaft transmits power through a gear combination of large gear, small gear, and large gear, resulting in relatively lower transmission resistance and higher stability.

[0017] Based on the above, the inner drill pipe flange and the outer drill pipe flange are either in contact or have a free-rotating fit via bearings.

[0018] The advantage is that the frictional resistance caused by the rotation of the inner and outer drill pipe flanges at the output end is smaller.

[0019] As described above, a sealing sleeve is provided between the inner drill pipe flange and the forward drive shaft.

[0020] Its advantage is that, by designing a sealing sleeve, it can prevent lubricating oil or other impurities from entering the drill pipe or drill pipe connection structure.

[0021] Based on the above, the outer frame includes two flange end caps at both ends and an outer frame disposed between the two flange end caps, and the flange end caps and the outer frame are locked together by bolts.

[0022] Its advantage is that by setting the outer frame in a combination manner, the assembly process of the outer frame is simpler and more efficient.

[0023] Based on the above, at least two sets of bearings are provided between the forward drive shaft and the reverse drive shaft sleeve.

[0024] Its advantage is that, with the support of at least two sets of bearings, the transmission resistance between the forward and reverse drive shafts is reduced.

[0025] Based on the above, one end of the outer frame is rotatably engaged with the forward drive shaft via a bearing, and the other end is engaged with the reverse drive shaft sleeve via a bearing.

[0026] The advantage is that the outer frame is appropriately lengthened in the length direction, and the structural size is relatively increased, which ensures that the space for gear transmission is sufficient and stable. However, since the size is mainly axially increased, the radial increase in volume is limited.

[0027] Based on the above, the length of the reverse drive shaft sleeve is ≤ half the length of the forward drive shaft.

[0028] The advantage is that the axial dimension of the entire power head is also reduced accordingly, thus reducing the overall volume of the power head.

[0029] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model adopts a bevel gear as the transmission method of the bidirectional stirring power head, combined with the inner and outer nested transmission shaft and bushing design. Compared with the traditional planetary gear structure, it is relatively smaller in size. At the same time, since the diameter constraint is eliminated, the transmission power can be increased by setting the transmission ratio of the bevel gear, so that the rotation speed of the inner and outer drill rods is kept within a relatively reasonable range, reducing the problem of power loss. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the power head of the double-stirring pile machine in this utility model.

[0031] In the diagram: 1. Forward drive shaft; 2. Reverse drive shaft sleeve; 3. Bevel gear assembly; 11. Inner drill pipe flange; 12. Sealing sleeve; 21. First bearing assembly; 22. Outer drill pipe flange; 31. Outer frame; 32. Bevel gear shaft; 33. First bevel gear; 34. Second bevel gear; 35. Third bevel gear; 36. Second bearing assembly; 37. Third bearing assembly; 38. Fourth bearing assembly; 311. Flange end cap; 322. Outer frame. Detailed Implementation

[0032] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0033] like Figure 1 As shown, a power head for a dual-stirring pile machine includes a forward drive shaft 1, a reverse drive shaft sleeve 2, and a bevel gear assembly 3.

[0034] The input end of the forward drive shaft 1 is used to connect to an external power source, such as the motor of a pile driver, and the output end is provided with an inner drill rod flange 11 for connecting to the inner drill rod. A sealing sleeve 12 is provided between the inner drill rod flange 11 and the forward drive shaft 1.

[0035] The reverse drive bushing 2 is rotatably mounted on the outside of the forward drive shaft 1 via the first bearing assembly 21. The input end of the reverse drive bushing 2 is driven by the bevel gear assembly 3, and the output end is provided with an outer drill rod flange 22 for connecting the outer drill rod.

[0036] In this embodiment, the length of the reverse drive shaft sleeve 2 is less than or equal to half the length of the forward drive shaft 1, so as to reduce the overall length and thus the overall volume, making the power head smaller and lighter.

[0037] In this embodiment, the inner drill pipe flange 11 and the outer drill pipe flange 22 do not contact each other. In other embodiments, rotational engagement can be achieved through rotating structures such as bearings to avoid friction problems caused by rotation.

[0038] The bevel gear assembly 3 includes an outer frame 31, a bevel gear shaft 32, a first bevel gear 33, a second bevel gear 34, and a third bevel gear 35.

[0039] The outer frame 31 is rotatably engaged with the forward drive shaft 1 and / or the reverse drive shaft sleeve 2 via bearings. In this embodiment, one end of the frame is rotatably engaged with the forward drive shaft 1 via a second bearing group 36, and the other end is rotatably engaged with the reverse drive shaft sleeve 2 via a third bearing group 37. The bevel gear shaft 32 is mounted on the outer frame 31 and is perpendicular to the forward drive shaft 1.

[0040] The first bevel gear 33 is fixed on the forward drive shaft 1, the second bevel gear 34 is mounted on the bevel gear shaft 32 via the fourth bearing assembly 38, and the third bevel gear 35 is fixed on the reverse drive shaft sleeve 2. The first bevel gear 33 meshes with the second bevel gear 34, and the second bevel gear 34 meshes with the third bevel gear 35. In this embodiment, the diameter of the second bevel gear 34 is smaller than the diameter of the first bevel gear 33 and the diameter of the third bevel gear 34, so that when the forward drive shaft 1 rotates in the forward direction, it drives the reverse drive shaft sleeve 2 to rotate in the reverse direction through the bevel gear assembly 3, and the transmission starting resistance is relatively small.

[0041] The outer frame 31 includes two flange end caps 311 at both ends and an outer frame 312 disposed between the two flange end caps. The flange end caps 311 and the outer frame 312 are fixed together by bolts, making the assembly structure relatively easier to disassemble.

[0042] In this embodiment, each bearing assembly includes at least two bearings to ensure the stability of the transmission.

[0043] Working principle explanation:

[0044] The input end of the forward drive shaft 1 is connected to the motor of the pile driver. The power input from the motor drives the forward drive shaft 1 to rotate in the forward direction, which in turn drives the inner drill rod connected to the output end to rotate in the forward direction.

[0045] At the same time, the first bevel gear 33, fixed on the forward drive shaft 1, rotates, driving the second bevel gear 34 to rotate. The second bevel gear 34 then drives the third bevel gear 35 to rotate. The third bevel gear 35 is fixed on the reverse drive shaft sleeve 2. Therefore, the reverse drive shaft sleeve 2 rotates synchronously with the third bevel gear 35, thus realizing the reverse rotation of the reverse drive shaft sleeve 2. The reverse drive shaft sleeve 2 then further drives the outer drill rod at the output end to rotate, ultimately realizing the bidirectional drive of the inner and outer double drill rods.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A power head for a dual-stirring pile machine, characterized in that: Includes forward drive shaft, reverse drive shaft sleeve and bevel gear assembly; The input end of the forward drive shaft is used to connect to external power, and the output end is provided with an inner drill rod flange for connecting the inner drill rod. The reverse drive bushing is rotatably mounted on the outside of the forward drive shaft via a bearing. The input end of the reverse drive bushing is driven by a bevel gear assembly, and the output end is provided with an outer drill rod flange for connecting the outer drill rod. The bevel gear assembly includes an outer frame, a bevel gear shaft, a first bevel gear, a second bevel gear, and a third bevel gear; The outer frame is rotatably engaged with the forward drive shaft and / or the reverse drive shaft sleeve via bearings, and the bevel gear shaft is mounted on the outer frame and is arranged perpendicular to the forward drive shaft; The first bevel gear is fixed on the forward drive shaft, the second bevel gear is mounted on the bevel gear shaft via a bearing, and the third bevel gear is fixed on the reverse drive shaft sleeve. The first bevel gear meshes with the second bevel gear, and the second bevel gear meshes with the third bevel gear, so that when the forward drive shaft rotates in the forward direction, it drives the reverse drive shaft sleeve to rotate in the reverse direction through the bevel gear assembly.

2. The power head of the double-stirring pile machine according to claim 1, characterized in that: The diameter of the second bevel gear is smaller than the diameter of the first bevel gear and the diameter of the third bevel gear, respectively.

3. The power head of the dual-stirring pile machine according to claim 1, characterized in that: The inner drill pipe flange and the outer drill pipe flange are either in contact or can rotate freely through bearings.

4. The power head of the double-stirring pile machine according to claim 1, characterized in that: A sealing sleeve is provided between the inner drill pipe flange and the forward drive shaft.

5. The power head of the double-stirring pile machine according to claim 1, characterized in that: The outer frame includes two flange end caps at both ends and an outer frame disposed between the two flange end caps. The flange end caps and the outer frame are locked together by bolts.

6. The power head of the double-stirring pile machine according to claim 1, characterized in that: At least two sets of bearings are provided between the forward drive shaft and the reverse drive shaft sleeve.

7. The power head of the double-stirring pile machine according to claim 1, characterized in that: One end of the outer frame is rotatably engaged with the forward drive shaft via a bearing, and the other end is engaged with the reverse drive shaft sleeve via a bearing.

8. The power head of the double-stirring pile machine according to claim 1, characterized in that: The length of the reverse drive shaft sleeve is less than or equal to half the length of the forward drive shaft.

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