A drill bit assembly for a square pile drill and mill

Abstract

The utility model provides a kind of square pile drilling milling excavator's drill head assembly, it is related to milling excavator field.The drill head assembly includes: connecting structure, including mounting seat and square connecting part, mounting seat is arranged in the one end of connecting part;Milling excavator head component, including four first milling excavator heads and two second milling excavator heads, four first milling excavator heads are pairwise distributed in a pair of symmetrical side of connecting part, two second milling excavator heads are respectively arranged in another pair of symmetrical side of connecting part;Four first milling excavator heads are rectangularly distributed, constitute two groups respectively located different side and oppositely arranged milling excavator head structure;And hydraulic drive structure, including two first hydraulic motors and two second hydraulic motors, two second hydraulic motors are respectively connected with two second milling excavator heads transmission;Two first hydraulic motors are respectively transmission connection with two transmission shafts, and each transmission shaft is respectively transmission connection with a group of milling excavator head structure.The present application solves the problem of coverage limitation caused by the arrangement of only two sides of the existing milling excavator drum.

Description

Technical Field

[0001] This utility model relates to the field of milling machine technology, and more specifically, to a drill bit assembly for a square pile drilling and milling machine. Background Technology

[0002] A milling machine is a special operating device mounted on a rotary drilling rig. Its core mechanism uses hydraulic power to drive the milling head to rotate at high speed, enabling the crushing and excavation of materials such as rock, soil, and concrete. It combines the impact force of a hydraulic breaker with the flexibility of an excavator, allowing for precise control of the excavation range under complex geological conditions. It is widely used in the construction of square piles for high-speed railways, highways, subways, and projects addressing geological disasters. It is particularly suitable for hard rock, weathered rock, and the demolition of existing structures that are difficult to handle with conventional machinery.

[0003] The excavation of square piles must revolve around the core objectives of "precise shaping and disturbance control," and typically involves three key steps. First is preliminary positioning, where surveying instruments are used to determine the center and outline of the square pile, markings are made on the ground, and a guide trench is excavated to provide a clear benchmark for the milling machine's operation. Second is layered milling, where the milling machine starts from the top of the pile and works downwards at fixed layer heights, gradually cutting through the soil and rock with the milling head. During this process, the verticality of the pile must be monitored in real time to prevent tilting. Finally, there is debris removal and finishing. After each layer of excavation is completed, debris inside the pile hole is promptly removed. Once the designed depth is reached, the pile wall and bottom are finished a second time to ensure that the square pile's cross-sectional dimensions and flatness meet construction requirements.

[0004] Although the "square pile milling machine" with application number CN202323542464.9 includes a connecting platform, a square pile frame, and milling drums (equivalent to the milling heads mentioned above), the cutting and covering of the four milling drums are only symmetrically arranged on both sides of the equipment. This results in low cross-sectional flatness and dimensional accuracy, requiring manual cleaning and correction, and insufficient excavation efficiency, making it difficult to meet the process requirements of "precision + efficiency" for square pile excavation. Utility Model Content

[0005] The purpose of this utility model is to provide a drill bit assembly for a square pile drilling and milling machine, which completely solves the problem of limited coverage caused by the milling drum being arranged only on both sides in the existing technology. It can achieve the flatness and dimensional accuracy of the square pile cross section in one excavation, eliminating the need for manual subsequent cleaning and correction, and greatly improving excavation efficiency. At the same time, it replaces the traditional manual excavation process with mechanical hole forming technology, which is in line with the national people-oriented development concept, avoids the injury to construction personnel caused by the risk of collapse during construction, and further improves construction efficiency.

[0006] The embodiments of this utility model are implemented as follows: This application provides a drill bit assembly for a square pile drilling and milling machine, comprising: a connecting structure including a mounting base and a square connecting portion, the mounting base being disposed at one end of the connecting portion for connecting an external work vehicle; a milling head assembly including four first milling heads and two second milling heads, the first and second milling heads being rotatably disposed on the annular side of the connecting portion, the four first milling heads being distributed in pairs on a pair of symmetrical sides of the connecting portion, and the two second milling heads being respectively disposed on the other pair of symmetrical sides of the connecting portion, and the two second milling heads being symmetrical about the center of the connecting portion; wherein, the four first milling heads are rectangularly distributed, forming two sets of milling head structures located on different sides and arranged opposite each other; and a hydraulic drive structure including two first hydraulic motors and two second hydraulic motors, the two second hydraulic motors being respectively drivenly connected to the two second milling heads; the two first hydraulic motors are respectively drivenly connected to two drive shafts, each drive shaft being respectively drivenly connected to a set of the milling head structures, for driving the two first milling heads in the set to rotate synchronously.

[0007] Furthermore, based on the aforementioned solution, a mounting groove is provided on the side of the connecting portion facing the mounting base, and the mounting groove is used to accommodate the hydraulic drive structure; wherein, the mounting base is provided with a wiring through hole, and the wiring through hole is connected to the mounting groove.

[0008] Furthermore, based on the aforementioned scheme, each of the first hydraulic motors and the corresponding drive shaft, and each of the second hydraulic motors and the corresponding second milling head, are driven by a gear set; wherein, the two first hydraulic motors and the two second hydraulic motors are arranged on the same plane.

[0009] Furthermore, based on the aforementioned scheme, the connection structure is provided with at least two limiters spaced circumferentially, each of the limiters comprising: a mounting portion disposed on the mounting base or the connecting portion; a limiting portion, one end of which is connected to the mounting portion and the other end of which extends outward in the peripheral direction of the mounting portion or the connecting portion; wherein the limiting portion is slidably disposed on the mounting portion, so that the limiting portion has the freedom to move laterally along the mounting base or the connecting portion; and an abutment portion disposed at the end of the limiting portion away from the mounting portion.

[0010] Furthermore, based on the aforementioned scheme, the side of the abutting portion away from the aforementioned limiting portion is constructed as an arched surface.

[0011] Furthermore, based on the aforementioned scheme, the limiting part is a cylindrical rod that passes through the mounting part and is threadedly connected to a locking nut; wherein, the mounting part is provided with an adjustment cavity through which the limiting part passes, the adjustment cavity is provided with a spring that elastically cooperates with the limiting part, and the outer side of the mounting part is provided with an opening that communicates with the adjustment cavity.

[0012] Furthermore, based on the aforementioned scheme, a slidable positioning sleeve is fitted onto the limiting part inside the adjustment cavity, and the positioning sleeve is provided with a locking bolt; wherein, the spring is fitted onto the limiting part, with one end abutting against the limiting part and the other end abutting against the inner wall of the adjustment cavity.

[0013] Furthermore, based on the aforementioned scheme, the mounting base is also provided with multiple assembly holes.

[0014] Furthermore, based on the aforementioned solution, the mounting base and the connecting part are detachably connected.

[0015] Furthermore, based on the aforementioned scheme, the outermost cutting surfaces of the four first milling heads and the outermost cutting surfaces of the two second milling heads are located on the same rectangular circumferential surface.

[0016] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: The drill bit assembly of the square pile milling machine in this embodiment of the application constructs an omnidirectional cutting layout based on the square connecting part. The four first milling heads are distributed in pairs on a pair of symmetrical sides of the connecting part to form two sets of opposite structures. The two second milling heads are correspondingly arranged on the other pair of symmetrical sides. Differentiated and precise transmission is achieved through a hydraulic drive structure. The two first hydraulic motors drive the two sets of first milling heads to rotate synchronously via the transmission shaft. The two second hydraulic motors directly drive the corresponding second milling heads to operate, so that all milling heads work together to form a complete cutting coverage of the four sides and four corners of the rectangular cross section of the square pile. Its advantage is that it completely solves the problem of limited coverage caused by the milling drum being arranged only on both sides in the prior art. The flatness and dimensional accuracy of the square pile cross section can be achieved in one excavation, without the need for subsequent manual cleaning and correction, which greatly improves the excavation efficiency. At the same time, the synchronous rotation design of the two sets of first milling heads combined with the independent drive of the second milling heads ensures uniform force and stable operation during the cutting process, perfectly adapting to the square pile excavation process requirements of "precise forming and efficient construction". Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an isometric view of a drill bit assembly of a square pile drilling and milling machine according to an embodiment of the present invention; Figure 2This is a side view of a drill bit assembly of a square pile drilling and milling machine according to an embodiment of the present utility model; Figure 3 This is a top view of a drill bit assembly of a square pile drilling and milling machine according to an embodiment of the present utility model; Figure 4 This is an isometric view of a drill bit assembly of a square pile drilling and milling machine according to an embodiment of the present invention, excluding the connecting structure. Figure 5 for Figure 4 Exploded view; Figure 6 This is an isometric view of the limiter according to an embodiment of the present invention; Figure 7 This is a side view of the limiter according to an embodiment of the present utility model.

[0019] Icons: 1-First milling head, 2-Second milling head, 3-Connecting structure, 301-Connecting part, 302-Mounting base, 4-Abutting part, 5-Limiting part, 6-Mounting part, 7-Spring, 8-Locking nut, 9-Positioning sleeve, 10-Locking bolt, 11-First hydraulic motor, 12-Drive shaft, 13-Second hydraulic motor, 14-Gear set. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example

[0021] Please refer to Figures 1-7 A drill bit assembly for a square pile drilling and milling machine includes: a connecting structure 3, comprising a mounting base 302 and a square connecting portion 301, wherein the mounting base 302 is disposed at one end of the connecting portion 301 for connecting an external work vehicle; and a milling head assembly, comprising four first milling heads 1 and two second milling heads 2, wherein the first milling heads 1 and the second milling heads 2 are rotatably disposed on the annular side of the connecting portion 301, the four first milling heads 1 being distributed in pairs on a pair of symmetrical sides of the connecting portion 301, and the two second milling heads 2 being respectively disposed on the other pair of symmetrical sides of the connecting portion 301, and the two upper... The second milling head 2 is symmetrical about the center of the connecting part 301; wherein, the four first milling heads 1 are arranged in a rectangular shape, forming two sets of milling head structures located on different sides and arranged opposite each other; and a hydraulic drive structure, including two first hydraulic motors 11 and two second hydraulic motors 13, the two second hydraulic motors 13 being drivenly connected to the two second milling heads 2 respectively; the two first hydraulic motors 11 are drivenly connected to two drive shafts 12 respectively, each drive shaft 12 being drivenly connected to a set of milling head structures, for driving the two first milling heads 1 in the set to rotate synchronously.

[0022] The drill bit assembly of the square pile milling machine in this embodiment of the application constructs an omnidirectional cutting layout based on the square connecting part 301. The four first milling heads 1 are distributed in pairs on a pair of symmetrical sides of the connecting part 301 to form two sets of opposite structures. The two second milling heads 2 are correspondingly arranged on the other pair of symmetrical sides. Differentiated and precise transmission is achieved through a hydraulic drive structure. The two first hydraulic motors 11 drive the two sets of first milling heads 1 to rotate synchronously through the transmission shaft 12, and the two second hydraulic motors 13 directly drive the corresponding second milling heads 2 to operate. This allows all milling heads to work together to form a complete cutting coverage of the four sides and four corners of the rectangular cross section of the square pile. Its advantage is that it completely solves the problem of limited coverage caused by the milling drum being arranged only on both sides in the prior art. The flatness and dimensional accuracy of the square pile cross section can be achieved in one excavation, without the need for subsequent manual cleaning and correction, which greatly improves the excavation efficiency. At the same time, the synchronous rotation design of the two sets of first milling heads 1 and the independent drive of the second milling heads 2 ensure uniform force and stable operation during the cutting process, perfectly adapting to the square pile excavation process requirements of "precise forming and efficient construction".

[0023] In a preferred embodiment, the connecting portion 301 is provided with a mounting groove on the side facing the mounting base 302, the mounting groove being used to accommodate the hydraulic drive structure; wherein, the mounting base 302 is provided with a wiring through hole, the wiring through hole being connected to the mounting groove.

[0024] In the above embodiments, by providing a mounting groove on the side of the connecting part 301 facing the mounting base 302 to accommodate the hydraulic drive structure, and by using the wiring through hole on the mounting base 302 to connect with the mounting groove, on the one hand, a centralized and compact layout of the hydraulic motor is achieved, optimizing space utilization efficiency, while providing physical protection for the hydraulic motor and reducing impact damage from external gravel and soil during construction; on the other hand, the hydraulic pipelines and circuits can be neatly connected to the mounting groove through the wiring through hole, avoiding messy and scratchy pipelines, ensuring the stable operation of the hydraulic and electrical systems, and improving the assembly convenience, reliability and maintenance efficiency of the equipment.

[0025] In a preferred embodiment, each of the first hydraulic motors 11 is connected to the corresponding drive shaft 12, and each of the second hydraulic motors 13 is connected to the corresponding second milling head 2 via a gear set 14; wherein, the two first hydraulic motors 11 and the two second hydraulic motors 13 are arranged on the same plane.

[0026] In the above embodiments, each first hydraulic motor 11 and its corresponding drive shaft 12, and each second hydraulic motor 13 and its corresponding second milling head 2 are all driven by a gear set 14. This leverages the advantages of high gear transmission efficiency, stable torque transmission, and strong overload resistance to ensure that power is accurately and reliably transmitted to the milling head during milling operations. Even in complex working conditions such as hard rock and dense soil, power loss or transmission failure can be avoided, ensuring cutting performance. At the same time, the arrangement of the two first hydraulic motors 11 and the two second hydraulic motors 13 on the same plane achieves a symmetrical and regular layout of the power system, ensuring uniform force distribution during equipment operation and effectively reducing eccentric vibration caused by motor height differences. This improves the stability of the milling process and the excavation accuracy of the square pile section. Furthermore, the arrangement on the same plane optimizes space utilization, facilitates the assembly, debugging, and subsequent maintenance of the gear set 14, and further enhances the overall operational reliability and efficiency of the equipment.

[0027] In a preferred embodiment, the connection structure 3 is provided with at least two limiters spaced apart circumferentially. Each limiter includes: a mounting portion 6, which is disposed on the mounting base 302 or the connecting portion 301; a limiting portion 5, one end of which is connected to the mounting portion 6, and the other end of which extends outward in the peripheral direction of the mounting portion 6 or the connecting portion 301; wherein the limiting portion 5 is slidably disposed on the mounting portion 6, so that the limiting portion 5 has the freedom to move laterally along the mounting base 302 or the connecting portion 301; and an abutment portion 4, which is disposed at the end of the limiting portion 5 away from the mounting portion 6.

[0028] In the above embodiments, the structure of the limiting part 5 being able to slide laterally along the mounting part 6 allows the limiter to flexibly adjust the abutment position according to the actual cross-sectional size of the square pile, easily adapting to the excavation needs of square piles of different specifications, and greatly improving the versatility and applicability of the equipment; in addition, at least two circumferentially spaced limiters abut against the inner wall of the square pile through the abutment part 4, which can provide stable guidance and positioning for milling operations, effectively preventing equipment deviation during milling and ensuring excavation accuracy.

[0029] In a preferred embodiment, the side of the contact portion 4 away from the limiting portion 5 is constructed as an arched surface.

[0030] In the above embodiment, the side of the abutment part 4 away from the limiting part 5 is constructed as an arched surface, which can reduce frictional damage with the inner wall of the square pile. At the same time, the arc-shaped contact achieves more uniform force distribution, ensuring the smoothness and stability of the guiding and positioning during milling operations.

[0031] In a preferred embodiment, the limiting part 5 is a cylindrical rod that passes through the mounting part 6 and is threadedly connected to a locking nut 8; wherein, the mounting part 6 is provided with an adjustment cavity through which the limiting part 5 passes, and the adjustment cavity is provided with a spring 7 that elastically cooperates with the limiting part 5, and the outer side of the mounting part 6 is provided with an opening that communicates with the adjustment cavity.

[0032] In the above embodiment, the limiting part 5 adopts a cylindrical rod that passes through the mounting part 6 and is connected to the threaded locking nut 8. The extension length of the cylindrical rod can be precisely adjusted by rotating the nut, and the limiting position can be firmly locked after adjustment, ensuring that the limiter guides and positions the milling operation stably and reliably. The elastic cooperation between the spring 7 in the adjusting cavity and the cylindrical rod can absorb equipment vibration during the milling process, avoiding hard contact damage between the limiting part 5 and the inner wall of the square pile, while providing a continuous and gentle clamping force for the abutment part 4. The opening on the outer side of the mounting part 6 that communicates with the adjusting cavity makes it easy to observe the status of the spring 7 and to inspect or replace the spring 7 and the cylindrical rod, further improving the adjustment flexibility, safety of use and convenience of maintenance of the limiter.

[0033] In a preferred embodiment, a slidable positioning sleeve 9 is fitted on the limiting part 5 inside the adjustment cavity, and the positioning sleeve 9 is provided with a locking bolt 10; wherein, the spring 7 is fitted on the limiting part 5, with one end abutting against the limiting part 5 and the other end abutting against the inner wall of the adjustment cavity.

[0034] In the above embodiment, by fitting a slidable positioning sleeve 9 on the limiting part 5 in the adjustment cavity and equipping it with a locking bolt 10, the compression of the spring 7 can be adjusted by sliding the positioning sleeve 9, and the position of the sleeve can be fixed by the locking bolt 10. This allows for flexible adjustment of the preload of the spring 7, which can be adapted to the required elastic buffering force according to different geological hardness or square pile specifications, avoiding equipment vibration caused by insufficient buffering or affecting the positioning accuracy by excessive buffering. At the same time, the positioning sleeve 9 can guide the spring 7, preventing the spring 7 from shifting, twisting or jamming during the extension and retraction process, ensuring that the spring 7 is always subjected to force along the axial direction of the limiting part 5, and ensuring the stability and reliability of the elastic buffering.

[0035] As a preferred embodiment, the mounting base 302 is also provided with a plurality of mounting holes.

[0036] In the above embodiment, the mounting base 302 is provided with multiple assembly holes, which can improve the firmness of the connection with the work vehicle through multi-point assembly and enhance the overall operational stability of the equipment.

[0037] In a preferred embodiment, the mounting base 302 and the connecting portion 301 are detachably connected.

[0038] In the above embodiments, the mounting base 302 and the connecting part 301 are detachably connected, which facilitates the maintenance and repair of the hydraulic motor inside the connecting part 301.

[0039] Furthermore, based on the aforementioned scheme, the outermost cutting surfaces of the four aforementioned first milling heads 1 and the outermost cutting surfaces of the two aforementioned second milling heads 2 are located on the same rectangular circumferential surface.

[0040] In the above embodiment, the outermost cutting surfaces of the four first milling heads 1 and the two second milling heads 2 are located on the same rectangular circumferential surface, which allows the cutting trajectory of all milling heads to accurately fit the rectangular cross-sectional outline of the square pile, enabling it to be formed in one excavation, completely avoiding the problem of local over-excavation or under-excavation caused by the difference in height of the cutting surface, and greatly improving the accuracy of the cross-sectional dimensions of the square pile.

[0041] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0042] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A drill bit assembly for a square pile drilling and milling machine, characterized in that, include: The connection structure (3) includes a mounting base (302) and a square connecting part (301). The mounting base (302) is disposed at one end of the connecting part (301) for connecting an external work vehicle. The milling head assembly includes four first milling heads (1) and two second milling heads (2). The first milling heads (1) and the second milling heads (2) are rotatably disposed on the annular side of the connecting part (301). The four first milling heads (1) are distributed in pairs on a pair of symmetrical sides of the connecting part (301), and the two second milling heads (2) are respectively disposed on the other pair of symmetrical sides of the connecting part (301). The two second milling heads (2) are symmetrical about the center of the connecting part (301). The four first milling heads (1) are arranged in a rectangular shape, forming two sets of milling head structures located on different sides and arranged opposite each other; and The hydraulic drive structure includes two first hydraulic motors (11) and two second hydraulic motors (13). The two second hydraulic motors (13) are respectively connected to two second milling heads (2). The two first hydraulic motors (11) are respectively connected to two drive shafts (12). Each drive shaft (12) is respectively connected to a set of milling head structures to drive the two first milling heads (1) in the set to rotate synchronously.

2. The drill bit assembly of a square pile drilling and milling machine according to claim 1, characterized in that, The connecting part (301) is provided with a mounting groove on the side facing the mounting base (302), and the mounting groove is used to accommodate the hydraulic drive structure; The mounting base (302) is provided with a wiring through hole, which is connected to the mounting groove.

3. The drill bit assembly of a square pile drilling and milling machine according to claim 2, characterized in that, Each of the first hydraulic motors (11) is connected to the corresponding drive shaft (12), and each of the second hydraulic motors (13) is connected to the corresponding second milling head (2) via a gear set (14); The two first hydraulic motors (11) and the two second hydraulic motors (13) are arranged on the same plane.

4. The drill bit assembly of a square pile drilling and milling machine according to claim 1, characterized in that, The connecting structure (3) is provided with at least two limiters spaced apart along the circumferential direction, each of the limiters comprising: The mounting part (6) is disposed on the mounting base (302) or the connecting part (301); The limiting part (5) is connected to the mounting part (6) at one end and extends outward toward the outer periphery of the mounting part (6) or the connecting part (301) at the other end. The limiting part (5) is slidably disposed on the mounting part (6), so that the limiting part (5) has the freedom to move laterally along the mounting base (302) or the connecting part (301); The abutting part (4) is provided at the end of the limiting part (5) away from the mounting part (6).

5. The drill bit assembly of a square pile drilling and milling machine according to claim 4, characterized in that, The side of the abutting part (4) away from the limiting part (5) is constructed as an arched surface.

6. The drill bit assembly of a square pile drilling and milling machine according to claim 4, characterized in that, The limiting part (5) is a cylindrical rod that passes through the mounting part (6) and is threadedly connected to a locking nut (8); The mounting part (6) is provided with an adjustment cavity through which the limiting part (5) passes. The adjustment cavity is provided with a spring (7) that elastically cooperates with the limiting part (5). The outer side of the mounting part (6) is provided with an opening that communicates with the adjustment cavity.

7. The drill bit assembly of a square pile drilling and milling machine according to claim 6, characterized in that, A slidable positioning sleeve (9) is fitted on the limiting part (5) inside the adjustment cavity, and the positioning sleeve (9) is provided with a locking bolt (10); The spring (7) is sleeved on the limiting part (5), with one end abutting against the limiting part (5) and the other end abutting against the inner wall of the adjusting cavity.

8. The drill bit assembly of a square pile drilling and milling machine according to claim 1, characterized in that, The mounting base (302) is also provided with multiple assembly holes.

9. The drill bit assembly of a square pile drilling and milling machine according to claim 1, characterized in that, The mounting base (302) and the connecting part (301) are detachably connected.

10. The drill bit assembly of a square pile drilling and milling machine according to claim 1, characterized in that, The outermost cutting surfaces of the four first milling heads (1) and the outermost cutting surfaces of the two second milling heads (2) are located on the same rectangular circumferential surface.

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