Two-wheel hydraulic milling and excavating head

Abstract

The utility model provides a kind of two-wheel hydraulic milling and digging head, it is related to engineering excavating equipment field. Including: drive mechanism is installed in mounting bracket, including: transmission gear group is by multiple transmission gear along vertical sequentially engaged, first intermediate gear set and second intermediate gear set include at least one intermediate gear respectively;The drive end of hydraulic motor is connected with the transmission gear of top transmission;The transmission gear of bottom is connected with first intermediate gear set transmission and is engaged with second intermediate gear set;First output gear is engaged with first intermediate gear set, and second output gear is engaged with second intermediate gear set;First drill wheel is connected with first output gear transmission, and second drill wheel is connected with second output gear transmission;First drill wheel and second drill wheel are rotatably supported in connecting shaft by bearing respectively. The application is by symmetry transmission system and compact structure, realizes the high efficiency, stable, low vibration bidirectional milling and digging operation, significantly improves construction efficiency and equipment reliability.

Description

Technical Field

[0001] This utility model relates to the field of engineering excavation equipment, and more specifically, to a two-wheeled hydraulic milling head. Background Technology

[0002] Hydraulic milling heads are widely used in tunnel excavation, mining, and municipal trenching due to their powerful performance and precise control. Traditional single-wheel milling heads, however, generate enormous unidirectional torque from the reaction force of rock breaking or cutting during operation, causing severe vibration and swaying of the entire device. This not only affects construction accuracy and efficiency but also accelerates fatigue damage to the drill rod and related connecting components. Furthermore, unidirectional rotation hinders the timely removal of excavated material, easily leading to cutter head wear and repeated cutting.

[0003] While some attempts at dual-wheel structures exist in existing technologies, their transmission systems are often complex and cumbersome, or fail to effectively solve the torque self-balancing problem, resulting in a non-compact structure, high energy loss, and difficulty in achieving optimal performance under space-constrained working conditions. Therefore, there is an urgent need for a dual-wheel milling device with a reasonable structure, efficient transmission, and the ability to automatically balance internal torque and improve milling efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a two-wheeled hydraulic milling head, which achieves efficient, stable, and low-vibration bidirectional milling operations through a symmetrical transmission system and compact structure, significantly improving construction efficiency and equipment reliability.

[0005] The embodiments of this utility model are implemented as follows: This application provides a two-wheel hydraulic milling head, including a mounting frame, a drive mechanism, a first drill wheel, and a second drill wheel; The drive mechanism is mounted on the mounting frame and includes a hydraulic motor, a transmission gear set, a first intermediate gear set, a second intermediate gear set, a first output gear, and a second output gear; wherein, the transmission gear set is composed of a plurality of transmission gears meshing vertically in sequence, and the first intermediate gear set and the second intermediate gear set each include at least one intermediate gear; The drive end of the hydraulic motor is connected to the transmission gear at the top of the transmission gear set; the transmission gear at the bottom of the transmission gear set is connected to the first intermediate gear set and meshes with the second intermediate gear set; the first output gear and the second output gear are coaxial and opposite to each other, and the first output gear meshes with the first intermediate gear set, and the second output gear meshes with the second intermediate gear set. The first drill wheel is connected to the first output gear via a first connector, and the second drill wheel is connected to the second output gear via a second connector; the first drill wheel and the second drill wheel are rotatably supported on the connecting shaft by bearings, wherein the first drill wheel and the second drill wheel rotate in opposite directions.

[0006] Furthermore, based on the aforementioned scheme, the transmission gear set includes four transmission gears, which are sequentially meshed and connected vertically.

[0007] Furthermore, based on the aforementioned scheme, the first intermediate gear set includes a first intermediate gear, and the second intermediate gear set includes two second intermediate gears; The transmission gear at the bottom of the transmission gear set is connected to the first intermediate gear via a first transmission shaft and meshes with one of the second intermediate gears; the two second intermediate gears are connected via a second transmission shaft.

[0008] Furthermore, based on the aforementioned scheme, both the first connecting member and the second connecting member have a hollow cylindrical structure, including an integrally formed first connecting part and a second connecting part; the first connecting part is used to connect with the first output gear / second output gear by a key; the second connecting part has an irregular surface, suitable for passing through the first drill wheel / second drill wheel; the connecting shaft is coaxially passed through the connecting shaft, the first output gear, the second output gear, the first connecting member, the second connecting member, the first drill wheel, and the second drill wheel.

[0009] Furthermore, based on the aforementioned scheme, the number of teeth of the first output gear is greater than the number of teeth of the first intermediate gear set, and / or the number of teeth of the second output gear is greater than the number of teeth of the second intermediate gear set.

[0010] Furthermore, based on the aforementioned scheme, both the first drill wheel and the second drill wheel are provided with multiple drill teeth on their wheel surfaces. The multiple drill teeth are inclined along the rotation direction of the corresponding drill wheel and are evenly arranged in multiple groups along the circumferential direction, with each group of drill teeth arranged obliquely on the wheel surface.

[0011] Furthermore, based on the aforementioned scheme, the drill bit includes a fixed end and a conical head, the conical head being fixed to the surface of the corresponding drill wheel via the fixed end.

[0012] Furthermore, based on the aforementioned scheme, the mounting frame includes a top plate and a hollow base plate, the base plate being vertically connected to the bottom center of the top plate, and a connecting seat being provided on the top of the top plate; the first drill wheel and the second drill wheel are respectively located on both sides of the base plate; the transmission gear set is located inside the base plate; the hydraulic motor is mounted on the base plate; and the connecting shaft is fixedly inserted through the base plate.

[0013] Furthermore, based on the aforementioned scheme, multiple reinforcing ribs are respectively provided between the top plate and the base plate, and between the top plate and the connecting seat.

[0014] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: This application, by setting up a drive mechanism consisting of a hydraulic motor, a transmission gear set, a first intermediate gear set, a second intermediate gear set, a first output gear, and a second output gear, can efficiently and reliably divert a single hydraulic power source to two independent transmission paths. By simultaneously connecting the transmission gear at the bottom of the transmission gear set to the first intermediate gear set and meshing with the second intermediate gear set, two transmission chains with the same transmission ratio but opposite rotation directions can be formed, laying the structural foundation for realizing double-wheel counter-rotation. By coaxially and relatively arranging the first and second output gears and meshing with their respective intermediate gear sets, the two output shafts can obtain rotational power in opposite directions, resulting in a compact and symmetrical structure. By rotatably supporting the first and second drill wheels on the same connecting shaft via bearings, the coaxiality and stability of the two drill wheels during rotation can be ensured, while also withstanding huge radial loads. Through the integration of the above transmission chains, driving the first and second drill wheels to rotate in opposite directions allows the torques generated by the two drill wheels during operation to cancel each other out, thereby greatly improving the overall machine's operational stability and reducing vibration and impact on the equipment's support structure. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of the two-wheeled hydraulic milling head according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the two-wheeled hydraulic milling head according to an embodiment of the present invention; Figure 3 This is a partial structural diagram of the two-wheeled hydraulic milling head according to an embodiment of the present invention; Figure 4 This is an exploded view of part of the structure of the two-wheeled hydraulic milling head according to an embodiment of the present invention.

[0017] Icons: 100-Mounting bracket, 110-Top plate, 120-Base plate, 130-Connecting seat, 140-Reinforcing rib; 200-Drive mechanism, 210-Hydraulic motor, 220-Transmission gear set, 230-First intermediate gear set, 240-Second intermediate gear set, 250-First output gear, 260-Second output gear; 300-First drill wheel, 400-Second drill wheel, 500-Connecting shaft, 600-First connector, 700-Second connector, 710-First connecting part, 720-Second connecting part, 800-Drill teeth. Detailed Implementation

[0018] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0019] Please refer to Figures 1-4 The diagram shown is a schematic representation of the overall structure of a two-wheeled hydraulic milling head. This embodiment provides a two-wheel hydraulic milling head, including a mounting frame 100, a drive mechanism 200, a first drill wheel 300, and a second drill wheel 400; The drive mechanism 200 is mounted on the mounting bracket 100 and includes a hydraulic motor 210, a transmission gear set 220, a first intermediate gear set 230, a second intermediate gear set 240, a first output gear 250, and a second output gear 260; wherein, the transmission gear set 220 is composed of a plurality of transmission gear sets 220 meshing vertically in sequence, and the first intermediate gear set 230 and the second intermediate gear set 240 each include at least one intermediate gear. The drive end of the hydraulic motor 210 is connected to the transmission gear at the top of the transmission gear set 220; the transmission gear at the bottom of the transmission gear set 220 is connected to the first intermediate gear set 230 and meshes with the second intermediate gear set 240; the first output gear 250 and the second output gear 260 are coaxial and opposite to each other, and the first output gear 250 meshes with the first intermediate gear set 230, and the second output gear 260 meshes with the second intermediate gear set 240. The first drill wheel 300 is connected to the first output gear 250 via the first connector 600, and the second drill wheel 400 is connected to the second output gear 260 via the second connector 700; and the first drill wheel 300 and the second drill wheel 400 are rotatably supported on the connecting shaft 500 by bearings, wherein the rotation directions of the first drill wheel 300 and the second drill wheel 400 are opposite.

[0020] The following will further describe a two-wheeled hydraulic milling head according to this exemplary embodiment.

[0021] In some embodiments, the aforementioned drive mechanism 200 is entirely integrated within the mounting frame 100, forming the core of the device's power and transmission. This mechanism includes a hydraulic motor 210, a transmission gear set 220, and independent first intermediate gear sets 230 and second intermediate gear sets 240, ultimately outputting power to the first output gear 250 and the second output gear 260, respectively. The drive end of the hydraulic motor 210 is connected to the transmission gear at the top of the transmission gear set 220, transmitting power vertically downwards. The transmission gear at the bottom of the transmission gear set 220 acts as a highly efficient power distribution hub, simultaneously connecting to the first intermediate gear set 230 and directly meshing with the second intermediate gear set 240; this design naturally diverts the power input from a single hydraulic source to two symmetrical transmission paths. The first output gear 250 and the second output gear 260 are coaxially and oppositely arranged, meshing with their respective intermediate gear sets. Ultimately, the first drill wheel 300 and the second drill wheel 400 are connected to the output gear via their respective dedicated connectors and are rotatably supported on a fixed connecting shaft 500 via bearings, ensuring that the first drill wheel 300 and the second drill wheel 400 can rotate synchronously in opposite directions. This counter-rotation design fundamentally counteracts the huge reverse torque generated when a single drill wheel is working, making the equipment exceptionally stable during operation, and significantly suppressing vibration and sway. This not only improves the flatness and accuracy of the milled surface but also significantly extends the service life of the main structure of the equipment and the external drill rods.

[0022] In a preferred embodiment, the aforementioned transmission gear set 220 can be composed of four transmission gears meshing vertically in sequence, with the middle transmission gears connected to the base plate 120 of the mounting frame 100 via gear shafts. Through multi-stage gear transmission, on the one hand, effective speed reduction and torque increase can be achieved, converting the high-speed, low-torque power output by the hydraulic motor 210 into the high-torque, low-speed rotation required by the drill wheel, thereby adapting to efficient milling of hard rock or concrete and improving the output power and demolition capability of the equipment; on the other hand, in order to facilitate the maintenance of the hydraulic motor 210, it is set outside the two drill wheels, and the transmission distance between the hydraulic motor 210 and the drill wheel can be increased through multi-stage gear meshing transmission.

[0023] As a preferred implementation, to achieve precise rotational control with the simplest structure, the first intermediate gear set 230 can be designed to include only one first intermediate gear, while the second intermediate gear set 240 includes two mutually driving second intermediate gears. The gear at the bottom of the transmission gear set 220 drives the first intermediate gear through a first transmission shaft, and simultaneously meshes with one of the second intermediate gears. This achieves the core function with a minimal number of gears, resulting in a compact transmission system layout, clear transmission path, reliable operation, and optimized manufacturing costs.

[0024] In a preferred embodiment, both the first connecting member 600 and the second connecting member 700 adopt a hollow cylindrical structure and include an integrally formed first connecting part 710 and a second connecting part 720. The first connecting part 710 achieves slip-free, powerful, and synchronous rotation with the output gear via a key connection, ensuring efficient and lossless torque transmission. The second connecting part 720 is designed with an irregular surface (such as a spline or hexagon) to securely pass through the corresponding hole in the center of the drill wheel, preventing relative rotation between the two. The connecting shaft 500 coaxially passes through the two output gears, the two connecting members, and the two drill wheels. This achieves precise alignment and stable support for all core rotating components, ensuring absolute reliability of power transmission. The hollow cylindrical structure also maximizes axial installation space savings, making the entire milling head structure very compact and greatly facilitating overall assembly and subsequent maintenance and disassembly.

[0025] As a preferred implementation, to further enhance the output torque during milling, the number of teeth of the first output gear 250 is greater than the number of teeth of the first intermediate gear set 230, and / or the number of teeth of the second output gear 260 is greater than the number of teeth of the second intermediate gear set 240. This tooth ratio, given a fixed input power of the hydraulic motor 210, can provide a greater output torque to the drill wheel, thereby significantly improving the milling head's crushing ability and cutting efficiency when facing high-strength media, and broadening its application range.

[0026] In a preferred embodiment, multiple drill teeth 800 are provided on the surfaces of both the first drill wheel 300 and the second drill wheel 400. These drill teeth 800 are not arranged vertically or randomly, but rather inclined along the rotation direction of the corresponding drill wheel, and are evenly arranged in multiple groups along the circumferential direction, with each group of drill teeth 800 arranged obliquely on the wheel surface. This unique design of inclined rotation and oblique array creates highly efficient cutting and chip removal. When the drill wheels rotate, the inclined drill teeth 800 can cut into and lift the material more smoothly, like plowing a field, while efficiently throwing the cut-off debris backward along the inclined direction, greatly improving the smoothness of chip removal and avoiding debris accumulation, repeated cutting, and jamming, thus achieving a continuous, efficient, and energy-saving milling process.

[0027] Each drill bit 800 can be optimized to include a cylindrical fixed end and a sharp conical tip. The conical tip is securely welded to the drill wheel surface via the fixed end or press-fitted with an interference fit. On the one hand, the hard and sharp conical tip provides concentrated compressive stress, making it easy to crush and cut into rock or concrete; on the other hand, the robust fixed end ensures that the drill bit 800 has extremely high connection strength when subjected to huge impacts and bending moments, making it less prone to breakage or detachment, thereby significantly improving the service life of the drill bit 800 and the operational reliability of the entire equipment under harsh conditions.

[0028] In a preferred embodiment, the mounting frame 100 includes a top plate 110 and a hollow box-shaped base plate 120. The base plate 120 is vertically connected to the center of the bottom of the top plate 110, and a connecting seat 130 for connecting the boom of external construction machinery (such as an excavator) is provided on the top of the top plate 110. The first drill wheel 300 and the second drill wheel 400 are located on both sides of the base plate 120, the transmission gear set 220 is accommodated in the internal cavity of the base plate 120, the hydraulic motor 210 is mounted on the outside of the base plate 120, and the connecting shaft 500 is fixedly inserted through the base plate 120, forming an integral load-bearing frame with extremely high rigidity and stability. It seals and protects all the precision transmission components, effectively preventing the intrusion of rock and soil dust and water. The hydraulic motor 210 is located on the outside for easy maintenance. At the same time, the two drill wheels are symmetrically arranged on both sides, so that the force is balanced during operation. The overall structure is compact and is very suitable for efficient operation in narrow and confined tunnel or trench environments.

[0029] To cope with the severe vibrations and impact loads generated during milling operations and to further improve the structural stability and fatigue life of the mounting frame 100, multiple reinforcing ribs 140 are provided at the connection between the top plate 110 and the base plate 120, and at the connection between the top plate 110 and the connecting seat 130. These significantly enhance the stiffness and bending and torsional strength of key force transmission parts, effectively dispersing and resisting continuous vibrations and complex alternating stresses, preventing stress concentration, deformation, or cracking of the structure, thereby ensuring the long-term operational safety and durability of the entire equipment under heavy loads and harsh working conditions.

[0030] 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.

[0031] 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 two-wheeled hydraulic milling head, characterized in that, Includes a mounting bracket, a drive mechanism, a first drill wheel, and a second drill wheel; The drive mechanism is mounted on the mounting frame and includes a hydraulic motor, a transmission gear set, a first intermediate gear set, a second intermediate gear set, a first output gear, and a second output gear; wherein, the transmission gear set is composed of a plurality of transmission gears meshing vertically in sequence, and the first intermediate gear set and the second intermediate gear set each include at least one intermediate gear; The drive end of the hydraulic motor is connected to the transmission gear at the top of the transmission gear set; the transmission gear at the bottom of the transmission gear set is connected to the first intermediate gear set and meshes with the second intermediate gear set; the first output gear and the second output gear are coaxial and opposite to each other, and the first output gear meshes with the first intermediate gear set, and the second output gear meshes with the second intermediate gear set. The first drill wheel is connected to the first output gear via a first connector, and the second drill wheel is connected to the second output gear via a second connector; the first drill wheel and the second drill wheel are rotatably supported on the connecting shaft by bearings, wherein the first drill wheel and the second drill wheel rotate in opposite directions.

2. The two-wheeled hydraulic milling head according to claim 1, characterized in that, The transmission gear set includes four transmission gears, which are meshed and connected vertically in sequence.

3. The two-wheeled hydraulic milling head according to claim 1, characterized in that, The first intermediate gear set includes a first intermediate gear, and the second intermediate gear set includes two second intermediate gears; The transmission gear at the bottom of the transmission gear set is connected to the first intermediate gear via a first transmission shaft and meshes with one of the second intermediate gears; the two second intermediate gears are connected via a second transmission shaft.

4. The two-wheeled hydraulic milling head according to claim 1, characterized in that, Both the first connecting member and the second connecting member are hollow cylindrical structures, including an integrally formed first connecting part and a second connecting part; the first connecting part is used to connect with the first output gear / second output gear by a key; the second connecting part has an irregular surface and is suitable for passing through the first drill wheel / second drill wheel; the connecting shaft is coaxially passed through the connecting shaft, the first output gear, the second output gear, the first connecting member, the second connecting member, the first drill wheel and the second drill wheel.

5. The two-wheeled hydraulic milling head according to claim 1, characterized in that, The number of teeth of the first output gear is greater than the number of teeth of the first intermediate gear set, and / or the number of teeth of the second output gear is greater than the number of teeth of the second intermediate gear set.

6. The two-wheeled hydraulic milling head according to claim 1, characterized in that, Both the first and second drill wheels have multiple drill teeth on their surfaces. The multiple drill teeth are inclined along the rotation direction of the corresponding drill wheel and are evenly arranged in multiple groups along the circumferential direction. Each group of drill teeth is arranged obliquely on the wheel surface.

7. The two-wheeled hydraulic milling head according to claim 6, characterized in that, The drill bit includes a fixed end and a conical head, and the conical head is fixed to the surface of the corresponding drill wheel through the fixed end.

8. The two-wheeled hydraulic milling head according to claim 1, characterized in that, The mounting frame includes a top plate and a hollow base plate. The base plate is vertically connected to the bottom center of the top plate, and a connecting seat is provided on the top of the top plate. The first drill wheel and the second drill wheel are respectively located on both sides of the base plate. The transmission gear set is located inside the base plate. The hydraulic motor is mounted on the base plate. The connecting shaft is fixedly inserted through the base plate.

9. The two-wheeled hydraulic milling head according to claim 8, characterized in that, Multiple reinforcing ribs are provided between the top plate and the base plate, and between the top plate and the connecting seat.

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