A mixing drill

Abstract

The present invention provides a mixing drill tool, which belongs to the field of construction machinery. Column-type underground continuous walls are widely used in foundation pit support projects in my country. Column-type underground continuous walls are driven by a group of drill rods by a special multi-axis drilling rig. During the drilling process, the end of the drill bit can inject cement slurry into the loosened soil to construct a section of cement soil wall. However, in the prior art, the drill hole formed when the drill rod rotates is circular, and the effective width of the trough formed by multiple continuous drill holes is smaller than the diameter of the drill hole, resulting in the effective thickness of the constructed wall being smaller than the design requirement. The present invention provides a mixing drill tool, comprising a power source, a transmission device, a drill rod group and a cutting device. The drill rod group comprises a plurality of drill rods, and a protruding section is provided on the drill rod. The cutting device is rotatably connected to the protruding section of the drill rod through a buffer device. When the drill rod rotates, the protruding section forms a cam mechanism to drive the cutting device to reciprocate, cut and widen the trough, and increase the effective thickness of the continuous wall.

Description

Technical Field

[0001] The invention belongs to the field of construction machinery, and in particular relates to a stirring drill tool. Background Art

[0002] Column-type underground continuous walls are widely used in foundation pit support projects in my country. Column-type underground continuous wall technology uses a dedicated multi-axis drilling rig to drive a set of drill rods, drilling into the soil in stages and then returning to the surface after reaching the target depth. During the drilling or return period, the drill bit can inject cement slurry into the loosened soil. The two are mixed and stirred to form a cement-soil wall. The next section of the cement-soil wall is then constructed, with adjacent sections overlapping. Repeating this process creates an underground cement-soil wall. Before the cement-soil wall solidifies, steel sections are generally inserted to increase its strength. After the cement-soil wall solidifies, a column-type underground continuous wall is constructed.

[0003] In the prior art, the drill rod of a multi-spindle drilling rig is a straight drill rod. Figure 14 (A) The drill hole formed when the drill rod rotates is circular. The effective width a of the slot formed by multiple consecutive drill holes is smaller than the diameter of the drill rod, resulting in the effective thickness of the constructed wall being less than the design requirement. At the same time, the material of the ineffective thickness part b is completely wasted.

[0004] Among the improvements to the existing technology, some solutions incorporate a curved section on the drill rod and securely mount a tool with cutting teeth on the curved section. When the drill rod rotates, the curved section acts like a cam, driving the tool to widen the drill hole, thereby increasing the effective width of the groove formed by the drill hole. However, in this solution, the cam structure bears significant pressure when it presses against the tool to cut the wall. During the tool's reciprocating motion, the tool experiences a reaction force that acts on the drill rod. This also generates various complex vibration loads depending on the soil conditions. When the drill rod penetrates deeply, the radial force and mechanical vibrations acting on the drill rod head act as a lever, transmitting the entire drill rod to the rear end like a lever, leading to problems such as drill rod tilt, drilling rig jamming, and malfunction. Furthermore, under high-power and high-torque conditions in construction, high temperatures and high pressures are generated at the connection between the tool and the drill rod, accelerating wear of the drill rod and even causing it to fail, thus impacting construction schedules and resulting in significant economic losses. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a stirring drill tool for solving the problems in the prior art that the actual effective width of the columnar underground continuous wall drilled by the conventional multi-axis drilling rig is lower than the drill rod diameter and there is an invalid thickness, and the corresponding improved scheme has a high drilling rig failure rate and a fast drill rod loss.

[0006] To achieve the above-mentioned objectives and other related objectives, the present invention provides a stirring drill tool, comprising a power source, a transmission device, a drill rod group and a cutting device, wherein the drill rod group comprises at least a first drill rod, a second drill rod and a third drill rod parallel to each other, and a drill bit is provided at one end of each drill rod, the input end of the transmission device is connected to the power source, and the tail end of the drill rod group is connected to the output end of the transmission device; the first drill rod and the third drill rod are provided with at least a first protruding section near the drill bit end, and the second drill rod is provided with at least a second protruding section near the drill bit end, and the first protruding section and the second protruding section are located in the same horizontal layer; the cutting device is rotatably connected to the protruding section of the drill rod group through a buffer device, and when the drill rod group rotates, the protruding section forms a cam mechanism to drive the cutting device to reciprocate, widen and cut the trough body.

[0007] Optionally, the transmission device includes a first gear, a second gear, a third gear, and a fourth gear meshed in sequence, the first gear being fixed to the output shaft of the power source, and the second gear, the third gear, and the fourth gear being fixed to the tail ends of the first drill rod, the second drill rod, and the third drill rod, respectively, with the connected gears rotating in opposite directions. In an initial state, the protruding sections of the first and third drill rods face the same direction and face the opposite direction to the protruding section of the second drill rod.

[0008] Optionally, the transmission device includes a first pulley, a second pulley, a third pulley, and a fourth pulley connected in sequence by a transmission belt, the first pulley being fixed to the output shaft of the power source, and the second pulley, the third pulley, and the fourth pulley being fixed in sequence to the tail ends of the first drill rod, the second drill rod, and the third drill rod, with the connected pulleys rotating in the same direction. In an initial state, the protruding sections of the first drill rod, the second drill rod, and the third drill rod are oriented in the same direction.

[0009] Optionally, the cutting device includes a first knife row group and a second knife row group, and the first knife row group and the second knife row group are arranged in two layers in parallel up and down within the same protruding section; the first knife row group is arranged on the first protruding section of the first drill rod and the third drill rod through the buffer device, and the second drill rod passes through the first empty slot in the middle of the first knife row group; the second knife row group is arranged on the second protruding section of the second drill rod through the buffer device, and the first drill rod and the third drill rod pass through the second empty slots on both sides of the second knife row group.

[0010] Optionally, the first and second cutter row groups are provided with cutting teeth on the outside and a tightening structure on the inside. The tightening structure of the first cutter row group corresponds to the first protruding sections of the first drill rod and the third drill rod, and the tightening structure of the second cutter row group corresponds to the second protruding section of the second drill rod.

[0011] Optionally, the buffer device includes a first arc-shaped member and a second arc-shaped member, both ends of the first arc-shaped member are provided with sliding grooves, both ends of the second arc-shaped member cooperate with the sliding grooves of the first arc-shaped member and can slide in the sliding grooves, the two first arc-shaped members are symmetrically fixedly connected to form an inner ring, and the two second arc-shaped members are symmetrically fixedly connected to form an outer ring, the outer ring rotates around the inner ring in the sliding groove, the inner wall of the outer ring is continuously provided with an arc-shaped elastic structure, and the arc top of the arc elastic structure contacts the outer wall of the inner ring.

[0012] Optionally, the buffer device also includes a first seal, a second seal and a third seal, the first seal is arranged between the two first arc-shaped members, the second seal is arranged between the two second arc-shaped members, the third seal is arranged in the slide groove connecting the inner ring and the outer ring, and the end of the second arc-shaped member is also provided with an injection hole and a fourth seal, and hydraulic oil is injected between the inner ring and the outer ring.

[0013] Optionally, the first drill rod and the third drill rod are further provided with a third protruding section near the drill bit end, and the second drill rod is further provided with a fourth protruding section near the drill bit end. The third protruding section and the fourth protruding section are located in the same horizontal layer, the third protruding section is in the opposite direction to the first protruding section, and the fourth protruding section is in the opposite direction to the second protruding section. Another cutting device is provided on the third protruding section and the fourth protruding section.

[0014] As described above, the stirring drill tool of the present invention has at least the following beneficial effects:

[0015] 1. While increasing the effective width of the columnar underground continuous wall, it also makes the wall width more uniform. The mixing drill is provided with multiple parallel drill rods. A protruding section is provided at the drill head end of the drill rod. A cutting device is provided on the protruding section. When the drill rod rotates and drills, the protruding section of the drill rod forms a cam structure, which drives the cutting device to reciprocate and cut the soil layers on both sides, so that the soil grooves on both sides of the drill rod are further widened, and the original continuous cylindrical soil grooves are cut into rectangles. The two sides of the soil grooves become flat, the columnar underground continuous wall becomes wider, and the wall thickness is more uniform.

[0016] 2. The reliability of the mixing drill system is higher, and the loss of the drill rod is significantly reduced. The mixing drill uses a buffer device between the drill rod and the cutting device. In the prior art, when the cutting device reciprocates to cut the wall, it will be subjected to the reaction force from the soil layer, forming a harsh working environment such as vibration, high temperature, and high pressure. The inner wall of the buffer device is continuously provided with an arc-shaped elastic structure. When a force is applied to one side, the arc-shaped elastic structure can absorb the load by deformation, and at the same time transmit the load in a circumferential direction, so that the unilateral force is converted into a circumferential force, effectively absorbing and reducing the reaction force transmitted from the cutting device to the drill rod; the buffer device is also filled with Hydraulic oil not only plays a lubricating role, but also can prevent components from oxidation and corrosion. Under ultra-large working conditions, forced cooling can also be started, that is, the hydraulic oil inside the buffer device is allowed to form an external circulation through two injection holes, and the internal high-temperature oil is replaced by the external cooling before entering the buffer device again to prevent the buffer device from being too hot and accelerating the wear of the drill pipe. In addition, the hydraulic oil itself also has the function of load transmission. Since the direction of liquid pressure is in all directions, when one side is subjected to force, it will quickly diffuse in all directions, thereby changing the unilateral force into a dispersed force, which helps to balance the circumferential force of the drill pipe, thereby improving the reliability of the drilling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is an overall schematic diagram of the present invention.

[0018] Figure 2 Shown is a schematic diagram of the installation of the cutting device of the present invention.

[0019] Figure 3 Shown is a schematic diagram of the transmission device of the present invention.

[0020] Figure 4 Shown is a schematic diagram of another transmission device of the present invention.

[0021] Figure 5 Shown is a schematic diagram of the buffer device of the present invention.

[0022] Figure 6 Shown is a schematic diagram of the first arc-shaped member of the buffer device of the present invention.

[0023] Figure 7 Shown is a schematic diagram of the second arc-shaped member of the buffer device of the present invention.

[0024] Figure 8 Shown is a schematic diagram of the knife row of the present invention.

[0025] Figure 9 Shown is a schematic diagram of the first blade row assembly of the present invention.

[0026] Figure 10 Shown is a schematic diagram of the second blade row assembly of the present invention.

[0027] Figure 11 Shown are two working state schematic diagrams of the present invention.

[0028] Figure 12 Shown are two other working state schematic diagrams of the present invention.

[0029] Figure 13 Shown is a schematic diagram of another embodiment of the present invention.

[0030] Figure 14 It shows a schematic diagram comparing the grooving effect of the present invention and the grooving effect of a traditional drilling tool.

[0031] Wherein: power source 10, transmission device 20, first gear 201, second gear 202, third gear 203, fourth gear 204, transmission belt 205, first pulley 206, second pulley 207, third pulley 208, fourth pulley 209, drill rod assembly 30, first drill rod 301, first protruding section 305, third protruding section 307, second drill rod 302, third drill rod 303, drill bit 304, second protruding section 306, fourth protruding section 307 8. Cutting device 40, first blade row group 401, second blade row group 402, tightening structure 4031, cutting teeth 4032, first empty slot 4033, second empty slot 4034, buffer device 50, first arc-shaped member 501, injection hole 5011, fourth seal 5012, slide groove 5013, second arc-shaped member 502, arc-shaped elastic structure 5021, first seal 503, second seal 504, third seal 505, hydraulic oil 506. DETAILED DESCRIPTION

[0032] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0033] See also Figures 1 to 14 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0034] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0035] For an embodiment of the stirring drill tool of the present invention, please refer to Figure 1 , comprising a power source 10, a transmission device 20, a drill rod assembly 30 and a cutting device 40, wherein the drill rod assembly 30 comprises at least a first drill rod 301, a second drill rod 302 and a third drill rod 303 which are parallel to each other, and a drill bit 304 is provided at one end of each drill rod, the input end of the transmission device 20 is connected to the power source 10, and the rear end of the drill rod assembly 30 is connected to the output end of the transmission device 20;

[0036] The first drill rod 301 and the third drill rod 303 are provided with at least one first protruding section 305 near the drill bit 304, and the second drill rod 302 is provided with at least one second protruding section 306 near the drill bit 304. The first protruding section 305 and the second protruding section 306 are located in the same horizontal layer.

[0037] The cutting device 40 is rotatably connected to the protruding section of the drill rod assembly 30 through the buffer device 50. When the drill rod assembly 30 rotates, the protruding section forms a cam mechanism to drive the cutting device 40 to reciprocate to widen and cut the groove body.

[0038] In traditional mixing drills, the drill rod is straight, as shown in the attached Figure 14 As shown in Figure (A), 63 represents the axis of the drill rod assembly, 611 and 612 represent the actual effective slot widths of conventional drill tools, and 61 and 62 represent the effective slot widths of the drill tool of this embodiment. In the prior art, the holes formed by the rotation of the drill rod are circular. The effective slot width a formed by multiple consecutive holes is smaller than the drill rod diameter, resulting in an effective wall thickness less than the design requirement. If a larger drill rod is used to meet the actual effective slot width requirement, the material of the ineffective thickness portion b is completely wasted.

[0039] Figure 11 and Figure 12 The four working positions of the mixing drill are further listed, which are 90° apart. Among them, 63 is the central axis of the drill rod group, and 61 and 62 are the final effective thicknesses of the columnar underground continuous wall. It can be seen that the effective width of the columnar underground continuous wall in this embodiment is significantly widened and the edge line is also straightened.

[0040] Specifically, in this embodiment, a protruding section is provided at the drill bit end of the mixing drill rod. This section increases the range of rotation of the drill rod as it rotates. A cutting device is rotatably fixed to the protruding section. As the drill rod rotates, the protruding section acts like a cam, repeatedly pushing the cutting device toward both sides of the trough, cutting the soil layer and creating a wider and flatter trough.

[0041] During the drilling process, the cutting device located at the rear of the drill bit continuously widens and levels the two sides of the original drill hole, while also stirring the cut soil debris. During the drilling or lifting of the drill rod, the end of the drill bit can also inject cement slurry into the loosened soil. After the two are mixed and stirred with each other, a section of cement soil wall is constructed.

[0042] Compared with the existing technology, the mixing drill provided in this embodiment can drill a more standard trough at one time, the two sides of the soil trough become flat, the columnar underground continuous wall becomes wider, and the wall thickness is more uniform; at the same time, the soil and cement slurry are mixed more fully, and the wall quality is better.

[0043] Furthermore, the effective slot widths 61 and 62 can be adjusted by adjusting the width of the cutting device.

[0044] For this example, please refer to Figure 2 、 Figure 3 and Figure 4 The transmission device 20 includes a first gear 201, a second gear 202, a third gear 203, and a fourth gear 204, which are sequentially meshed. The first gear 201 is fixed to the output shaft of the power source 10, and the second gear 202, the third gear 203, and the fourth gear 204 are fixed to the ends of the first drill rod 301, the second drill rod 302, and the third drill rod 303, respectively. The connected gears rotate in opposite directions. In the initial state, the protruding sections of the first drill rod 301 and the third drill rod 303 are aligned in the same direction and opposite to the protruding section of the second drill rod 302.

[0045] The drill rods are connected to each other through gears, and the rotation directions of the two connected drill rods are opposite, such as Figure 2 The above is the initial state. When the protruding sections of the first and third drill rods are rotated to the outside, the protruding section of the second drill rod is also rotated to the outside. Therefore, when the cutting device is located at the cutting station on a certain side, the protruding sections of each drill rod are synchronously facing that side, thereby avoiding interference or collision between the cutting devices connected to different drill rods.

[0046] For this example, please refer to Figure 5 and Figure 6 The transmission device 20 includes a first pulley 206, a second pulley 207, a third pulley 208, and a fourth pulley 209, which are sequentially connected by a transmission belt 205. The first pulley 206 is fixed to the output shaft of the power source 10, and the second pulley 207, the third pulley 208, and the fourth pulley 209 are sequentially fixed to the tail ends of the first drill rod 301, the second drill rod 302, and the third drill rod 303. The connected pulleys rotate in the same direction. In the initial state, the protruding sections of the first drill rod 301, the second drill rod 302, and the third drill rod 303 are oriented in the same direction.

[0047] This embodiment provides another optional transmission device solution, which replaces the gear transmission in the previous embodiment with a belt transmission. The rotation direction between the drill rods also becomes consistent, so the initial angle of each drill rod is adjusted accordingly. This solution is optional, but it has unique advantages in certain special scenarios, such as in scenarios where the spacing between the drill rods of a mixing drill is large. Because when the distance between the drill rods is large, direct gear transmission requires gears with a large diameter to enable the gears between the connected drill rods to engage, which will inevitably increase the size of the transmission device. In addition, the processing and manufacturing costs of large-diameter gears are difficult to control, the economic benefits are low, and they are heavy, making transportation and installation inconvenient. Compared with gears, the advantages of transmission belts are light weight and small size. When the spacing between the drill rods changes, the length of the transmission belt can be changed without the need to redesign and manufacture the gears.

[0048] For this example, please refer to Figure 2 The cutting device 40 includes a first cutter row group 401 and a second cutter row group 402. The first cutter row group 401 and the second cutter row group 402 are arranged in parallel in two layers in the same protruding section. The first cutter row group 401 is arranged in the first protruding section 305 of the first drill rod 301 and the third drill rod 303 through the buffer device 50, and the second drill rod 302 passes through the first empty slot 4033 in the middle of the first cutter row group 401. The second cutter row group 402 is arranged in the second protruding section 306 of the second drill rod 302 through the buffer device 50, and the first drill rod 301 and the third drill rod 303 pass through the second empty slots 4034 on both sides of the second cutter row group 402.

[0049] Both ends of the first cutter row group are rotatably connected to the protruding section of the drill rod through a buffer device. When the first and third drill rods rotate, a cam structure is formed, which drives the cutting teeth on both sides of the first cutter row group to reciprocate and cut the soil on both sides; although the second cutter row group is only connected to one drill rod, the second empty slots on both sides cooperate with the first and third drill rods, and the first and third drill rods play a limiting role on the second cutter row group, which also ensures that the second drill rod can drive the second cutter row group to reciprocate and cut the soil on both sides.

[0050] Using a dual-row cutter set, the lower row performs initial crushing during drill rod excavation, followed by further crushing by the upper row. Optionally, the lower row can use coarser blades to initially chop the soil into clods. Then, as the drill bit descends, the upper row can move into the position of the lower row, where finer cutting teeth are used to crush and mix the clods, achieving distributed cutting and better soil crushing and mixing.

[0051] For this example, please refer to Figure 8 、 Figure 9 and Figure 10The first cutter row group 401 and the second cutter row group 402 are provided with cutting teeth 4032 on the outside and a tightening structure 4031 on the inside. The tightening structure 4031 of the first cutter row group 401 corresponds to the first protruding section 305 of the first drill rod 301 and the third drill rod 303, and the tightening structure 4031 of the second cutter row group 402 corresponds to the second protruding section 306 of the second drill rod 302.

[0052] When the clamping structures are aligned, the holes between them are matched. The target shaft is placed between the inner concave surfaces of the clamping structure, and then bolts are inserted into the clamping holes to lock the cutter row group and the target shaft together as a whole. This type of clamping design can be applied to target shafts of various diameters, that is, the clamping parts are universal. When the diameter of the drill pipe shaft changes, there is no need to redesign the clamping structure. However, during implementation, the width of the expanded groove can be adjusted by adjusting the overall thickness of the clamping structure. Another way is to adjust the width of the expanded groove by changing the protruding depth of the protruding section of the drill pipe shaft. However, the drill pipe processing is complicated, and it is difficult to implement adjustments once the processing is completed. Adjusting the width of the cutter row group is relatively simple.

[0053] For this example, please refer to Figure 5 、 Figure 6 and Figure 7 The buffer device 50 includes a first arc-shaped member 501 and a second arc-shaped member 502. The first arc-shaped member 501 has two ends provided with a slide groove 5013. The second arc-shaped member 502 has two ends that cooperate with the slide groove 5013 of the first arc-shaped member 501 and can slide in the slide groove 5013. The two first arc-shaped members 501 are symmetrically fixedly connected to form an inner ring, and the two second arc-shaped members 502 are symmetrically fixedly connected to form an outer ring. The outer ring rotates around the inner ring in the slide groove 5013. The inner wall of the outer ring is continuously provided with an arc-shaped elastic structure 5021. The arc top of the arc elastic structure 5021 contacts the outer wall of the inner ring.

[0054] The buffer device includes multiple arc-shaped parts, which are spliced ​​together to form a circular ring. The advantage of this is that during installation, it does not need to slide along the axis to the installation position like a traditional circular ring structure. In actual implementation, the inner ring needs to be fixedly connected to the target shaft. The existing technology mainly squeezes it in through an interference fit, which is difficult to disassemble once installed. Moreover, the interference fit also means that it cannot slide easily, so it is actually impossible to implement it in long axes and curved axes.

[0055] In the above embodiment, on the one hand, the installation is carried out in a manner of embracing the arc parts, which simplifies the installation method, especially for scenarios such as very long drill rods, as there is no need to slide the ring along the drill rod to the installation position; on the other hand, an arc-shaped elastic structure is continuously arranged between the inner and outer rings. When the inner and outer rings are subjected to unilateral extrusion pressure, the arc-shaped elastic structure can absorb energy and deform. During the deformation process, the two sides of a single arc in the arc-shaped elastic structure will expand and squeeze each other, thereby converting the radial force into annular force, so that the unilateral shear force of the intermediate shaft is balanced and becomes a force distributed in an axial ring. The arc-shaped elastic structure can also absorb most instantaneous loads such as vibration, block the vibration transmission between the active part and the driven part, and play a role of buffering protection.

[0056] For this example, please refer to Figure 5 The buffer device 50 also includes a first seal 503, a second seal 504 and a third seal 505. The first seal 503 is arranged between the two first arc-shaped members 501, the second seal 504 is arranged between the two second arc-shaped members 502, and the third seal 505 is arranged in the slide groove 5013 connecting the inner ring and the outer ring. The end of the second arc-shaped member 502 is also provided with a liquid injection hole 5011 and a fourth seal 5012, and hydraulic oil 506 is injected between the inner ring and the outer ring.

[0057] Under heavy loads, the arc-shaped elastic structure within the buffer undergoes a repetitive process of deformation and recovery. As the outer ring rotates around the inner ring, a significant amount of mechanical energy is converted into internal energy, which is distributed within the buffer as heat. Under the influence of high temperature and high pressure, the risk of failure of the buffer itself and its connected active and passive components increases significantly. In this embodiment, sealing structures are provided between the various components of the buffer, and an oil filling hole is provided on the outer ring for injecting hydraulic oil. This not only provides lubrication, reduces rotational resistance, and minimizes mechanical energy conversion, but also has a high specific heat capacity, absorbing heat and reducing the temperature rise of the buffer during operation.

[0058] For this example, please refer to Figure 13 The first drill rod 301 and the third drill rod 303 are further provided with a third protruding section 307 near the drill bit 304 end, and the second drill rod 302 is further provided with a fourth protruding section 308 near the drill bit 304 end. The third protruding section 307 and the fourth protruding section 308 are located in the same horizontal layer, the third protruding section 307 is opposite to the direction of the first protruding section 305, and the fourth protruding section 308 is opposite to the direction of the second protruding section 306. Another cutting device 40 is provided on the third protruding section 307 and the fourth protruding section 308.

[0059] Compared with the other embodiments mentioned above, the main difference of this embodiment is that each drill rod has a correspondingly added protruding section, and the direction of the new protruding section is opposite to the direction of the original protruding section. In this way, when the cutting device installed on the original protruding section cuts the soil layer on one side, the cutting device at the new protruding section just cuts the other side. On the one hand, it speeds up the cutting efficiency. On the other hand, during the cutting operation, compared with the original embodiment that can only cut on one side at the same time, this embodiment cuts on both sides at the same time. In this way, the forces acting on the drill rod are opposite, achieving a mutual offset effect, which greatly improves the reliability of the mixing drill. In summary, this embodiment better makes the force on the entire mixing device more balanced and uniform, while increasing construction efficiency and further optimizing mechanical stability.

[0060] Furthermore, according to the above principle, the number of protruding sections can be further increased on the drill rod assembly, and more layers of cutting devices can be installed to obtain better stability and operating efficiency.

[0061] In summary, the stirring drill of the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A stirring drill tool, comprising a power source (10), a transmission device (20), a drill rod group (30) and a cutting device (40), wherein the drill rod group (30) comprises at least a first drill rod (301), a second drill rod (302) and a third drill rod (303) which are parallel to each other, and a drill bit (304) is provided at one end of each drill rod, an input end of the transmission device (20) is connected to the power source (10), and a rear end of the drill rod group (30) is connected to an output end of the transmission device (20); It is characterized by: The first drill rod (301) and the third drill rod (303) are provided with at least one first protruding section (305) near the end of the drill bit (304), and the second drill rod (302) is provided with at least one second protruding section (306) near the end of the drill bit (304), and the first protruding section (305) and the second protruding section (306) are located in the same horizontal layer; The cutting device (40) is rotatably connected to the horizontal layer of the protruding section of the drill rod group (30) through the buffer device (50); when the drill rod group (30) rotates, the protruding section forms a cam mechanism to drive the cutting device (40) to reciprocate, widen, and cut the groove body flat; The first drill rod (301) and the third drill rod (303) are further provided with a third protruding section (307) near the end of the drill bit (304), and the second drill rod (302) is further provided with a fourth protruding section (308) near the end of the drill bit (304). The third protruding section (307) and the fourth protruding section (308) are located in the same horizontal layer, the third protruding section (307) is in the opposite direction to the first protruding section (305), and the fourth protruding section (308) is in the opposite direction to the second protruding section (306). Another cutting device (40) is provided on the third protruding section (307) and the fourth protruding section (308).

2. The stirring drill according to claim 1, characterized in that: The transmission device (20) comprises a first gear (201), a second gear (202), a third gear (203) and a fourth gear (204) which are arranged in meshing relationship. The first gear (201) is fixed to the output shaft of the power source (10). The second gear (202), the third gear (203) and the fourth gear (204) are fixed to the tail ends of the first drill rod (301), the second drill rod (302) and the third drill rod (303) in sequence. The rotation directions of the connected gears are opposite.

3. The stirring drill tool according to claim 2, characterized in that: In the initial state, the protruding sections of the first drill rod (301) and the third drill rod (303) are oriented in the same direction, and are oriented in the opposite direction to the protruding section of the second drill rod (302).

4. The stirring drill according to claim 1, characterized in that: The transmission device (20) includes a first pulley (206), a second pulley (207), a third pulley (208) and a fourth pulley (209) which are connected in sequence through a transmission belt (205), wherein the first pulley (206) is fixed to the output shaft of the power source (10), and the second pulley (207), the third pulley (208) and the fourth pulley (209) are fixed to the tail ends of the first drill rod (301), the second drill rod (302) and the third drill rod (303) in sequence, and the rotation directions of the connected pulleys are the same.

5. The stirring drill tool according to claim 4, characterized in that: In the initial state, the protruding sections of the first drill rod (301), the second drill rod (302) and the third drill rod (303) are oriented in the same direction.

6. The stirring drill tool according to claim 1, characterized in that: The cutting device (40) comprises a first knife row group (401) and a second knife row group (402), wherein the first knife row group (401) and the second knife row group (402) are arranged in two layers in parallel in the same horizontal layer of the protruding section. The first cutter row group (401) is arranged on the first protruding sections (305) of the first drill rod (301) and the third drill rod (303) through the buffer device (50), and the second drill rod (302) passes through the first empty slot (4033) in the middle of the first cutter row group (401); The second cutter row assembly (402) is arranged on the second protruding section (306) of the second drill rod (302) through the buffer device (50), and the first drill rod (301) and the third drill rod (303) pass through the second empty slots (4034) on both sides of the second cutter row assembly (402).

7. The stirring drill tool according to claim 6, characterized in that: The first cutter row group (401) and the second cutter row group (402) are provided with cutting teeth (4032) on the outside and a tightening structure (4031) on the inside. The tightening structure (4031) of the first cutter row group (401) corresponds to the first protruding section (305) of the first drill rod (301) and the third drill rod (303), and the tightening structure (4031) of the second cutter row group (402) corresponds to the second protruding section (306) of the second drill rod (302).

8. The stirring drill tool according to claim 1, characterized in that: The buffer device (50) includes a first arc-shaped member (501) and a second arc-shaped member (502), wherein two ends of the first arc-shaped member (501) are provided with a slide groove (5013), and two ends of the second arc-shaped member (502) cooperate with the slide groove (5013) of the first arc-shaped member (501) and can slide in the slide groove (5013), the two first arc-shaped members (501) are symmetrically fixedly connected to form an inner ring, and the two second arc-shaped members (502) are symmetrically fixedly connected to form an outer ring, and the outer ring rotates around the inner ring in the slide groove (5013), and the inner wall of the outer ring is continuously provided with an arc-shaped elastic structure (5021), and the arc top of the arc-shaped elastic structure (5021) contacts the outer wall of the inner ring.

9. The stirring drill tool according to claim 8, characterized in that: The buffer device (50) further includes a first seal (503), a second seal (504) and a third seal (505), wherein the first seal (503) is arranged between the two first arc-shaped members (501), the second seal (504) is arranged between the two second arc-shaped members (502), and the third seal (505) is arranged in the slide groove (5013) connecting the inner ring and the outer ring. The end of the second arc-shaped member (502) is also provided with a liquid injection hole (5011) and a fourth seal (5012), and hydraulic oil (506) is injected between the inner ring and the outer ring.

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