A drill bit structure for an eight-wheel hydraulic milling and excavating apparatus

Abstract

The utility model provides a kind of drill bit structure of eight-wheel hydraulic milling and digging equipment, it is related to engineering excavating equipment field.The utility model discloses two groups of drive mechanism are installed in mounting frame with interval;Eight drill wheels are oppositely arranged in the both sides of mounting frame in two two groups;Each group of drive mechanism includes: hydraulic motor;Transmission gear set is made of multiple transmission gears which are sequentially engaged along vertical direction;First intermediate gear set and second intermediate gear set are vertically symmetrical, and each includes at least one intermediate gear and is coaxially connected with drill wheel by a connecting piece;The driving end of hydraulic motor is drivingly connected with the transmission gear on the top of transmission gear set;The transmission gear on the bottom of transmission gear set is meshingly connected with first intermediate gear set;Second intermediate gear set is meshingly connected with first intermediate gear set;First output gear is meshed with first intermediate gear set, and second output gear is meshed with second intermediate gear set;The rotation direction of adjacent two drill wheels is opposite.The application can realize efficient, stable, reliable and easy-to-maintain tunneling operation.

Description

Technical Field

[0001] This utility model relates to the field of engineering excavation equipment, and more specifically, to a drill bit structure for an eight-wheel hydraulic milling machine. Background Technology

[0002] In diaphragm wall construction and municipal engineering, milling equipment is an important tunneling tool, and its performance directly affects construction efficiency and cost. Traditional milling equipment with single-drill or fewer-drill-drill-bit systems suffers from low tunneling efficiency, poor stability, and is prone to significant vibration and eccentric loading. These problems are particularly pronounced in hard rock or complex geological conditions, leading to accelerated equipment wear and shortened lifespan.

[0003] While some multi-wheel drill bit designs exist in the current technology, they often feature complex transmission structures and unreasonable layouts, resulting in low power transmission efficiency and a non-compact structure. Furthermore, the force balance and motion coordination among multiple drill wheels are poorly controlled, easily leading to mutual interference and preventing the formation of an efficient and coordinated cutting surface. In addition, the ease of maintenance and protection of critical components in existing equipment are often inadequate. Utility Model Content

[0004] The purpose of this utility model is to provide a drill bit structure for an eight-wheel hydraulic milling equipment, which can solve the above-mentioned problems and achieve efficient, stable, reliable and easy-to-maintain tunneling operations.

[0005] The embodiments of this utility model are implemented as follows: This application provides a drill bit structure for an eight-wheel hydraulic milling device, including a mounting frame, two sets of drive mechanisms, and eight drill wheels; the two sets of drive mechanisms are installed at intervals on the mounting frame; the eight drill wheels are arranged in pairs on both sides of the mounting frame, forming four sets of drill wheels in total. Each group of the drive mechanisms includes: Hydraulic motor; A transmission gear set consists of multiple transmission gears that mesh sequentially in a vertical direction; The first intermediate gear set and the second intermediate gear set are arranged vertically symmetrically and each includes at least one intermediate gear. The first output gear and the second output gear are arranged vertically symmetrically. 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 meshes with the first intermediate gear set; the second intermediate gear set meshes with the first intermediate gear set; 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 output gear and the second output gear are respectively coaxially connected to a corresponding set of drill wheels via a connector; wherein, the rotation directions of two adjacent drill wheels are opposite.

[0006] Furthermore, based on the aforementioned scheme, 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. A connecting seat is provided at the top center of the top plate. Multiple reinforcing ribs are respectively provided between the top plate and the connecting seat. The eight drill wheels are respectively located opposite each other on both sides of the base plate. The hydraulic motor is mounted on the top plate.

[0007] Furthermore, based on the aforementioned scheme, the top plate is composed of a first plate and three second plates detachably connected to the top of the first plate, with the connecting seat and the two hydraulic motors respectively located on the three second plates.

[0008] Furthermore, based on the aforementioned scheme, the drive end of the hydraulic motor is covered with a motor housing.

[0009] Furthermore, based on the aforementioned scheme, the transmission gear set includes two transmission gears, which are sequentially meshed and connected vertically. The first intermediate gear set includes two obliquely meshing first intermediate gears; the second intermediate gear set includes two obliquely meshing second intermediate gears; the first intermediate gears that are close to each other mesh horizontally with the second intermediate gears.

[0010] 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.

[0011] Furthermore, based on the aforementioned scheme, the two ends of the connector are respectively irregular surfaces, which are suitable for fitting and connecting with the corresponding drill wheel.

[0012] Furthermore, based on the aforementioned scheme, an end cap is fitted onto the connector near the end face of the drill wheel, and the end cap is connected to the corresponding drill wheel.

[0013] Furthermore, based on the aforementioned scheme, the surface of each drill wheel is provided with multiple drill teeth, which are inclined along the rotation direction of the corresponding drill wheel and evenly arranged in multiple groups along the circumferential direction, with each group of drill teeth arranged obliquely on the surface of the wheel; each drill tooth 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.

[0014] Furthermore, based on the aforementioned scheme, limiting structures are respectively provided at the four corners of the top plate. The limiting structure includes a fixed seat, a spring, a sliding sleeve rod, and an arc-shaped abutment plate. The fixed seat is installed on the top plate. The sliding sleeve rod passes through the fixed seat, with the spring sleeved at one end near the fixed seat and the spring abutting against the fixed seat. The other end of the sliding sleeve rod is connected to the arc-shaped abutment plate. In its natural state, the arc-shaped abutment plate is located outside the outer end face of the drill wheel.

[0015] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: This application, through its integrated structure comprising a mounting frame, two sets of drive mechanisms, and eight drill wheels arranged in pairs on both sides of the mounting frame to form four groups, constructs a symmetrical and stable force system, significantly improving the overall stability of the milling head during operation and effectively counteracting lateral torques during operation. By employing a power layout structure with two independent drive mechanisms, it provides ample and balanced power to the four drill wheels, avoiding the complex transmission and low efficiency problems associated with single-point drive, thus improving transmission efficiency and operational capability. Furthermore, through a precision gear transmission chain structure consisting of a hydraulic motor, transmission gear sets, symmetrically arranged first and second intermediate gear sets, and first and second output gears, [the application achieves this]. It can efficiently and reliably transmit and distribute power to two sets of drill wheels with opposite rotation directions, ensuring the accuracy and smoothness of power transmission. By connecting the first and second output gears to the corresponding set of drill wheels through connecting parts and limiting the rotation directions of adjacent drill wheels to opposite directions, the core transmission structure can balance the cutting reaction forces of adjacent drill bits during counter-rotation, fundamentally and effectively offsetting vibration, preventing equipment deviation, and forming a highly efficient shearing and crushing effect, thereby improving milling efficiency and quality. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the overall structure of the drill bit structure of the eight-wheel hydraulic milling equipment according to an embodiment of this utility model; Figure 2 This is a partial exploded view of the drill bit structure of the eight-wheel hydraulic milling equipment according to an embodiment of this utility model; Figure 3 This is a partial axial sectional view of the drill bit structure of the eight-wheel hydraulic milling equipment according to an embodiment of this utility model; Figure 4 This is a partial longitudinal sectional view of the drill bit structure of the eight-wheel hydraulic milling equipment according to an embodiment of the present invention; Figure 5 This is a side view of the drill bit structure of the eight-wheel hydraulic milling equipment according to an embodiment of the present invention.

[0018] Icons: 100-Mounting bracket, 110-Top plate, 111-First plate, 112-Second plate, 120-Base plate, 130-Connecting seat, 140-Reinforcing rib; 200-Drive mechanism, 210-Hydraulic motor, 211-Motor housing, 220-Transmission gear set, 221-Transmission gear, 230-First intermediate gear set, 231-First intermediate gear, 240-Second intermediate gear set, 241-Second intermediate gear, 250-First output gear, 260-Second output gear; 300-Drill wheel, 310-Drill teeth, 400-Connector, 500-End cap, 600-Limiting structure, 610-Fixing seat, 620-Spring, 630-Sliding sleeve rod, 631-First rod body, 632-Second rod body, 640-Arc-shaped abutment plate. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0020] Please refer to Figures 1-5 The diagram shows the overall structure of the drill bit in an eight-wheel hydraulic milling machine. This embodiment provides a drill bit structure for an eight-wheel hydraulic milling device, including a mounting frame 100, two sets of drive mechanisms 200 and eight drill wheels 300; the two sets of drive mechanisms 200 are installed at intervals on the mounting frame 100; the eight drill wheels 300 are arranged in pairs on both sides of the mounting frame 100, forming a total of four sets of drill wheels 300. Each drive mechanism 200 includes: Hydraulic motor 210; The transmission gear set 220 is composed of multiple transmission gears 221 that mesh sequentially in a vertical direction; The first intermediate gear set 230 and the second intermediate gear set 240 are arranged vertically symmetrically and each includes at least one intermediate gear. First output gear 250 and second output gear 260; the two are arranged vertically symmetrically. The drive end of the hydraulic motor 210 is connected to the transmission gear 221 at the top of the transmission gear set 220; the transmission gear 221 at the bottom of the transmission gear set 220 is meshed with the first intermediate gear set 230; the second intermediate gear set 240 is meshed with the first intermediate gear set 230; the first output gear 250 is meshed with the first intermediate gear set 230, and the second output gear 260 is meshed with the second intermediate gear set 240; the first output gear 250 and the second output gear 260 are respectively coaxially connected to a corresponding set of drill wheels 300 through a connector 400; wherein, the rotation directions of two adjacent drill wheels 300 are opposite.

[0021] The drill bit structure of an eight-wheel hydraulic milling device will now be further described in this exemplary embodiment.

[0022] In some embodiments, the two sets of drive mechanisms 200 are spaced apart on the mounting frame 100, providing power to the entire milling head. Eight drill wheels 300 are arranged in pairs on both sides of the mounting frame 100, forming four pairs of drill wheels 300. This symmetrical layout provides a structural foundation for the stability of the equipment operation. Each set of drive mechanisms 200 integrates a precision gear transmission system, which originates from a hydraulic motor 210. The hydraulic motor 210 serves as the power source, and its drive end is connected to the transmission gear 221 at the top of the transmission gear set 220. The transmission gear set 220 consists of multiple vertically meshing transmission gears 221, primarily responsible for the initial transmission and distribution of power. The transmission gear 221 at the bottom of the transmission gear set 220 guides the power to the vertically symmetrically arranged first intermediate gear set 230 and second intermediate gear set 240. The two intermediate gear sets further mesh, ensuring that power can be transmitted synchronously and in opposite directions. Finally, the first output gear 250, meshing with the first intermediate gear set 230, and the second output gear 260, meshing with the second intermediate gear set 240, are coaxially connected to a corresponding set (two) of drill wheels 300 via a connector 400, preferably a key connection. Through this transmission design, the two output gears driven by the same drive mechanism 200 rotate in opposite directions. Combined with the symmetrical arrangement of the drill wheels 300, this ensures that the rotation directions of adjacent drill wheels 300 are always opposite. This counter-rotation design allows the cutting forces to cancel each other out on both sides of the mounting frame 100, greatly improving the stress condition of the equipment, significantly reducing overall machine vibration and off-center load torque, thereby improving operational stability and component lifespan.

[0023] In a preferred embodiment, the mounting frame 100 comprises a top plate 110 and a hollow base plate 120. The base plate 120 is vertically connected to the bottom center of the top plate 110, and eight drill wheels 300 are positioned in pairs on either side of the base plate 120. A connecting seat 130 for connecting external equipment is provided at the top center of the top plate 110, and the top plate 110 and the connecting seat 130 are reinforced by multiple reinforcing ribs 140. The hydraulic motor 210 is mounted on the top plate 110 and integrated with the drill wheels 300 on both sides of the base plate 120 within a highly rigid frame. This not only provides a reliable mounting base for all moving parts, effectively resisting complex loads during operation and preventing structural deformation, but also provides ample and protected mounting space for the internal gear transmission system within the hollow base plate 120.

[0024] In a preferred embodiment, the top plate 110 is constructed by splicing a first plate 111 and three second plates 112 detachably connected to its top. A connecting seat 130 and two hydraulic motors 210 are respectively mounted on these three independent second plates 112, with openings at corresponding positions to facilitate connection between the hydraulic motors 210 and the transmission gear set 220. This structural design achieves modularity; when a hydraulic motor 210 or connecting seat 130 needs maintenance or replacement, it is not necessary to disassemble the entire top plate 110 or affect other components, greatly improving the convenience of on-site equipment maintenance and shortening downtime.

[0025] Furthermore, in order to protect the precision power source, the drive end of the hydraulic motor 210 is covered with a motor housing 211, which can prevent dust, water, and impacts, reducing the risk of the hydraulic motor 210 failing due to the intrusion of foreign objects or accidental impacts, and ensuring the reliability of the core power.

[0026] In a specific gear transmission implementation scheme, the transmission gear set 220 includes two transmission gears 221 that mesh directly vertically, resulting in a simple and efficient structure. Simultaneously, the first intermediate gear set 230 and the second intermediate gear set 240 are each composed of two obliquely meshing gears, and the gears in the two intermediate gear sets that are close to each other are horizontally meshed, ensuring that the first output gear 250 and the second output gear 260 can achieve the required symmetrical reverse rotation. On the other hand, to facilitate the maintenance of the hydraulic motor 210 and to maintain the compactness of the milling head structure, the hydraulic motor 210 is mounted on the top of the top plate 110, thereby increasing the transmission distance. Based on this, this embodiment uses a transmission path with two transmission gears 221, two intermediate gears, and one output gear, matching the transmission distance of the hydraulic motor 210. It should be noted that the intermediate gears and the transmission gears 221 meshing with the intermediate gears are rotatably connected to the base plate 120 via their respective gear shafts, providing good stability for their transmission.

[0027] As a preferred implementation, to optimize output performance, the number of teeth on the first output gear 250 is designed to be greater than the number of teeth on the first intermediate gear set 230, and / or the number of teeth on the second output gear 260 is greater than the number of teeth on the second intermediate gear set 240. Through the final gear pair, speed reduction and torque amplification are achieved, ensuring that the torque output to the drill wheel 300 is sufficiently large to handle hard rock and soil layers, thereby improving the cutting capability and working efficiency of the milling head.

[0028] As a preferred implementation, the two ends of the connector 400 are designed with irregular surfaces (such as splines, polygonal prisms, etc.) to adapt and connect with the corresponding drill wheel 300, providing a torque transmission capability far exceeding that of conventional flat keys, making the connection more reliable, and effectively avoiding the risk of key rolling or shear failure of key connections under high load conditions.

[0029] As a preferred implementation, to further improve connection reliability and adapt to harsh working conditions, an end cap 500 is also fitted onto the connector 400 near the end face of the drill wheel 300, and the end cap 500 is connected to the drill wheel 300. On the one hand, it can limit the connector 400 axially, enhancing the axial stability of the entire transmission chain; on the other hand, it has a good sealing and protective effect, preventing impurities such as mud, water, and rock cuttings from entering the key connection area and causing wear and corrosion.

[0030] In a preferred embodiment, the drill wheel 300 has multiple drill teeth 310 on its surface. These drill teeth 310 are inclined along the rotation direction of the corresponding drill wheel 300 and are evenly arranged in multiple groups along the circumferential direction, with each group of drill teeth 310 arranged obliquely on the wheel surface. Each drill tooth 310 includes a fixed end and a conical head. The inclined and oblique arrangement makes the drill teeth 310 cut into the rock and soil more smoothly, forming an efficient shearing and stripping action, rather than simple impact and crushing, thereby reducing cutting resistance, improving milling efficiency, and reducing wear on the drill teeth 310.

[0031] In a preferred embodiment, limiting structures 600 are respectively provided at the four corners of the top plate 110. Each limiting structure 600 consists of a fixed base 610, a spring 620, a sliding sleeve 630, and an arc-shaped abutment plate 640. The sliding sleeve 630 passes through the fixed base 610 and elastically abuts against the fixed base 610 via the spring 620, with its other end connected to the arc-shaped abutment plate 640. In its natural state, the arc-shaped abutment plate 640 is located outside the outer end face of the drill wheel 300 under the action of the spring 620. When the equipment is working, the arc-shaped abutment plate 640 remains in contact with the excavation face under the pressure of the spring 620, forming a dynamic, flexible boundary. This not only effectively prevents the drill wheel 300 from excessively intruding into the working face and causing jamming, but also provides a certain degree of protection to the non-cutting area outside the drill wheel 300, reducing direct impact from the rock wall on the equipment. Simultaneously, its elastic properties can adapt to the unevenness of the excavation face, ensuring the smooth movement of the equipment. By setting the arc-shaped abutment plate 640, the friction force on the arc-shaped abutment plate 640 during sliding can be reduced, making it easier for the arc-shaped abutment plate 640 to slide.

[0032] Specifically, the aforementioned sliding sleeve 630 consists of a first rod 631 and a second rod 632 movably sleeved outside the first rod 631. An arc-shaped abutment plate 640 is connected to the outer end of the second rod 632. The first rod 631 is located inside the fixed base 610, and the second rod 632 movably passes through the fixed base 610. A limit crossbar is provided inside the fixed base 610 to limit the sliding stroke of the second rod 632, preventing the second rod 632 from sliding too far and also preventing the second rod 632 from falling off the fixed base 610. A spring 620 is sleeved outside the first rod 631, and its two ends abut against the second rod 632 and the inner wall of the fixed base 610, respectively.

[0033] In actual use, as the milling head gradually moves downwards along the drilled square pile hole, the sliding sleeve 630 slides along the fixed seat 610 and the arc-shaped abutment plate 640 abuts against the inner wall of the square pile hole. In this way, the arc-shaped abutment plate 640 abuts against the inner wall of the square pile hole, thus limiting the movement of the milling head in the square pile hole and improving the forming quality of the square pile hole.

[0034] 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.

[0035] 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 structure for an eight-wheel hydraulic milling machine, characterized in that, It includes a mounting frame, two sets of drive mechanisms, and eight drill wheels; the two sets of drive mechanisms are installed at intervals on the mounting frame. The eight drill wheels are arranged in pairs on both sides of the mounting frame, forming a total of four groups of drill wheels; Each group of the drive mechanisms includes: Hydraulic motor; A transmission gear set consists of multiple transmission gears that mesh sequentially in a vertical direction; The first intermediate gear set and the second intermediate gear set are arranged vertically symmetrically and each includes at least one intermediate gear. The first output gear and the second output gear are arranged vertically symmetrically. 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 meshes with the first intermediate gear set; the second intermediate gear set meshes with the first intermediate gear set; 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 output gear and the second output gear are respectively coaxially connected to a corresponding set of drill wheels via a connector; wherein, the rotation directions of two adjacent drill wheels are opposite.

2. The drill bit structure of the eight-wheel hydraulic milling equipment 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. A connecting seat is provided at the top center of the top plate. Multiple reinforcing ribs are provided between the top plate and the connecting seat. The eight drill wheels are respectively located in pairs on both sides of the base plate. The hydraulic motor is mounted on the top plate.

3. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 2, characterized in that, The top plate is composed of a first plate and three second plates that are detachably connected to the top of the first plate. The connecting seat and the two hydraulic motors are respectively located on the three second plates.

4. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 3, characterized in that, The drive end of the hydraulic motor is covered by a motor housing.

5. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 1, characterized in that, The transmission gear set includes two transmission gears, which are meshed and connected vertically in sequence; The first intermediate gear set includes two obliquely meshing first intermediate gears; the second intermediate gear set includes two obliquely meshing second intermediate gears; the first intermediate gears that are close to each other mesh horizontally with the second intermediate gears.

6. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 5, 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.

7. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 1, characterized in that, The two ends of the connector are irregular surfaces, which are suitable for fitting and connecting with the corresponding drill wheel.

8. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 7, characterized in that, An end cap is fitted onto the connector near the end face of the drill wheel, and the end cap is connected to the corresponding drill wheel.

9. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 1, characterized in that, The surface of each drill wheel is provided with multiple drill teeth. 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 surface of the wheel. Each drill tooth includes a fixed end and a conical head. The conical head is fixed to the surface of the corresponding drill wheel through the fixed end.

10. The drill bit structure of the eight-wheel hydraulic milling equipment according to claim 2, characterized in that, Limiting structures are provided at the four corners of the top plate. Each limiting structure includes a fixed seat, a spring, a sliding sleeve, and an arc-shaped abutment plate. The fixed seat is installed on the top plate. The sliding sleeve passes through the fixed seat, with the spring sleeved at one end near the fixed seat and abutting against the fixed seat. The other end of the sliding sleeve is connected to the arc-shaped abutment plate. The arc-shaped abutment plate is located outside the outer end face of the drill wheel in its natural state.

Images