Telescopic hydraulic square pile drill bit

Abstract

The utility model belongs to the technical field of drilling equipment, and particularly relates to a telescopic hydraulic square pile drill bit. According to the specific technical scheme, the device comprises a top plate, a bottom plate, an adjusting assembly and an excavating assembly; the top plate and the bottom plate are connected through a telescopic assembly; the adjusting assembly comprises first connecting arms and second connecting arms, one ends of the two first connecting arms are symmetrically hinged to the lower end of the top plate, and the excavating assembly is arranged at the other ends of the first connecting arms. One ends of the two groups of second connecting arms are respectively hinged with the two groups of first connecting arms, and the other ends of the two groups of second connecting arms are hinged with the bottom plate; the telescopic assembly stretches up and down to adjust the distance between the top plate and the bottom plate so as to adjust the wheel track between the two excavating assemblies.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling equipment, and in particular relates to a telescopic hydraulic square pile drill bit. Background Art

[0002] The drilling method of square piles is generally to use a round drill bit to drill and excavate the middle part first, and then use a special square pile drill bit to mill the angle. Due to the different sizes of square piles, the required milling angles are different, and excavation components with different wheel spacing or different diameters are required to adapt to square piles of different sizes. In the development process of hydraulic square pile drill bits, we have always hoped to develop some composite drill bits that can be used for multiple purposes, have multiple functions, or can process multiple square pile sizes. This can reduce the complexity of square pile drill bit inventory management for users, and at the same time, it can also allow equipment owners to maximize equipment utilization. Based on this, we developed this telescopic multifunctional hydraulic square pile drill bit. Summary of the invention

[0003] In order to solve the above technical problems, the utility model provides a telescopic hydraulic square pile drill. The function of this square pile drill is that the wheelbase of two excavation wheels can be adjusted to achieve the excavation of square piles of different sizes; at the same time, the equipment itself has variable functions and can be turned into an efficient tool in another usage scenario through simple operation.

[0004] In order to achieve the purpose of the above-mentioned utility model, the technical solution adopted by the utility model is: a telescopic hydraulic square pile drill bit, including a top plate, a bottom plate, an adjustment assembly and an excavation assembly, the top plate and the bottom plate are connected by a telescopic assembly; the adjustment assembly includes a first connecting arm and a second connecting arm, one end of two groups of the first connecting arms are symmetrically hinged at the lower end of the top plate, and the other end thereof is provided with the excavation assembly; one end of two groups of the second connecting arms are respectively hinged to the two groups of the first connecting arms, and the other ends thereof are both hinged to the bottom plate; the telescopic assembly is telescoped up and down to adjust the distance between the top plate and the bottom plate, and is used to adjust the wheelbase between the two excavation assemblies.

[0005] Preferably, the telescopic component includes a positioning sleeve and a positioning shaft that cooperate with each other. The positioning sleeve is fixedly arranged at the lower end of the top plate, and the positioning shaft is fixedly arranged at the upper end of the bottom plate. The positioning sleeve is provided with a plurality of first positioning mounting holes along the telescopic direction of the telescopic component, and the positioning shaft is provided with a second positioning mounting hole corresponding to the first positioning mounting hole. The telescopic function is realized by the cooperation between the positioning sleeve and the positioning shaft through the first positioning mounting hole and the second positioning mounting hole.

[0006] Preferably, two groups of the adjustment components are symmetrically arranged at the lower end of the top plate, and the end of the first connecting arm away from the top plate is fixedly connected to the excavator travel assembly mounting tube; each group of the adjustment components is provided with two groups of the excavation components, and the axial directions of the two groups of the excavation components are parallel to each other, and the outer end of the excavator travel assembly mounting tube is connected to the excavation component through the excavator travel assembly.

[0007] Preferably, two groups of the adjusting components are symmetrically arranged at the lower end of the top plate, and the end of the first connecting arm away from the top plate is fixedly connected to the excavator travel assembly mounting cylinder; only one group of the adjusting components is provided with two groups of the excavating components, and the axial directions of the two excavating components are parallel to each other, and the outer end of the excavator travel assembly mounting cylinder is connected to the excavating component through the excavator travel assembly; when excavating "T"-shaped square piles, the arc surfaces of the two excavator travel assembly mounting cylinders without the excavating components installed are positioned and matched with the inner wall of the square pile hole.

[0008] Preferably, the outer end of the excavator travel assembly mounting tube is provided with a plurality of first connecting screw holes, and the excavator travel assembly is provided with second connecting screw holes corresponding to the first connecting screw holes; the excavating assembly includes an excavating wheel body and an excavating element, and a plurality of the excavating elements are arranged on the excavating wheel body, a connecting plate is fixedly connected to the inner side wall of the excavating wheel body, and a third connecting screw hole is provided on the connecting plate, and a fourth connecting screw hole corresponding to the third connecting screw hole is provided at the rotating end of the reducer of the excavator travel assembly.

[0009] Preferably, a group of the first connecting arms includes one, two or more first connecting arms; a group of the second connecting arms includes one, two or more second connecting arms.

[0010] Preferably, a group of the first connecting arms includes two first connecting arms; the two first connecting arms are fixedly arranged on the circumferential side wall of the excavator walking assembly mounting cylinder, and the two first connecting arms are arranged opposite to each other and connected by a reinforcing plate; four rotating center seats are arranged on the lower surface of the top plate, and the rotating center seats are symmetrically penetrated with first connecting pin holes, and one end of the first connecting arm is provided with a second connecting pin hole corresponding to the first connecting pin hole.

[0011] Preferably, a group of the second connecting arms includes two second connecting arms; two connecting seats are symmetrically arranged on the upper surface of the base plate, two third connecting pin holes are symmetrically arranged through the connecting seats, and a fourth connecting pin hole corresponding to the third connecting pin hole is arranged on the second connecting arm; a fifth connecting pin hole is arranged on the end of the second connecting arm away from the fourth connecting pin hole, and a sixth connecting pin hole corresponding to the fifth connecting pin hole is arranged on the first connecting arm.

[0012] Preferably, a connecting square head is provided on the upper surface of the top plate, and top reinforcing ribs are provided between the upper surface of the top plate and the connecting square head and around the top plate; bottom reinforcing ribs are provided between the positioning sleeve and the lower surface of the top plate.

[0013] Preferably, bottom plate reinforcing ribs are provided between the lower surface of the bottom plate and the positioning shaft and around the bottom plate.

[0014] The utility model has the following beneficial effects:

[0015] 1. By setting a telescopic assembly between the top plate and the bottom plate, one end of the two groups of first connecting arms is symmetrically hinged at the lower end of the top plate, and the other end thereof is provided with an excavation assembly; one end of the two groups of second connecting arms is respectively hinged to the two groups of first connecting arms, and the other end thereof is hinged to the bottom plate. When the bottom plate is adjusted to move up and down, the bottom plate drives the second connecting arm hinged thereto to move, and the second connecting arm drives the first connecting arm to move, and the first connecting arm drives the excavator travel assembly mounting cylinder to rotate along the rotation center seat fixed to the top plate. When the excavator travel assembly mounting cylinder swings along the rotation center, the rotation and swing of the excavation assembly is realized, thereby realizing the adjustment of the excavation range of the square pile drill bit, thereby realizing the excavation of square piles of different sizes.

[0016] 2. When a pair of excavating wheels is removed, the arc surface of the travel assembly mounting seat can be positioned with the inner wall of the deep hole of the square pile to achieve positioning during milling and prevent the square drill bit from swinging on the inner wall of the square pile when milling the "T"-shaped square pile. The milled "T"-shaped square pile has a standard shape and a smooth surface, thereby realizing the milling excavation of special-shaped square piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the square pile drill bit of the utility model (digging components are provided on both sides);

[0018] Figure 2 for Figure 1 Schematic diagram of the structure from top view;

[0019] Figure 3 for Figure 2 Structural diagram of the AA section;

[0020] Figure 4 for Figure 2 Structural diagram of the middle BB section;

[0021] Figure 5 Based Figure 1 Schematic diagram of the Chinese pile drill bit in the unfolded state;

[0022] Figure 6 This is a schematic diagram of the overall structure of the square pile drill bit of the utility model (only one side is provided with an excavation component);

[0023] Figure 7 Schematic diagram of the structure of the top plate and the positioning sleeve of the utility model, wherein (a) is a schematic diagram of an upright state, and (b) is a schematic diagram of an inverted state;

[0024] Figure 8 This is a schematic diagram of the structure of the base plate and the positioning shaft of the utility model;

[0025] Fig. 9 It is a structural schematic diagram of the installation cylinder and the first connecting arm of the excavator walking assembly of the utility model;

[0026] Fig.10 It is a structural schematic diagram of the excavation component of the utility model;

[0027] Fig.11 It is a schematic diagram of the construction method of the square pile drill bit (digging components are arranged on both sides) of the utility model;

[0028] Fig.12 The utility model is a schematic diagram of the construction method of the square pile drill bit (only one side is provided with the digging component).

[0029] In the figure: top plate 1, bottom plate 2, positioning sleeve 3, positioning shaft 4, first connecting arm 5, second connecting arm 6, top reinforcement rib 7, first positioning mounting hole 8, connecting square head 9, excavating element 10, excavating cutting scraper 11, excavating wheel body 12, excavator travel assembly mounting tube 13, second positioning mounting hole 15, bottom reinforcement rib 16, excavator travel assembly 17, first connecting screw hole 18, sixth connecting pin hole 19, second connecting pin hole 20, reinforcement plate 21, connecting plate 22, third connecting screw hole 23, bottom plate reinforcement rib 24, connecting seat 25, third connecting pin hole 26, rotating center seat 28, first connecting pin hole 29. Implementation

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0031] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] like Figure 1-10 As shown, the utility model discloses a telescopic hydraulic square pile drill, comprising a top plate 1, a bottom plate 2, an adjusting assembly and an excavating assembly, wherein the top plate 1 is connected to the bottom plate 2 via a telescopic assembly; the adjusting assembly comprises a first connecting arm 5 and a second connecting arm 6, one end of two groups of the first connecting arms 5 are symmetrically hinged on the lower surface of the top plate 1, and the other ends of the two first connecting arms 5 are each provided with a rotatable excavating assembly; one end of the two groups of the second connecting arms 6 are respectively hinged to the two groups of the first connecting arms 5, and the other ends thereof are both hinged to the bottom plate 2; the telescopic assembly is telescoped up and down to adjust the distance between the top plate 1 and the bottom plate 2, thereby being used to adjust the wheelbase between the two excavating assemblies to adapt to square piles of different sizes.

[0033] The telescopic assembly here can be an existing structure that can realize the telescopic function, such as a telescopic rod, a telescopic shaft, a telescopic cylinder, or the like, or a structure disclosed below. The telescopic assembly is provided to adjust the distance between the top plate 1 and the bottom plate 2, and in combination with the first connecting arm 5 and the second connecting arm 6, the wheelbases of the two excavating assemblies connected to the same adjustment assembly can be adjusted to accommodate square piles of different sizes.

[0034] Furthermore, the present application discloses a telescopic assembly structure, such as Figure 7 and 8 As shown, the telescopic assembly includes a positioning sleeve 3 and a positioning shaft 4 that cooperate with each other. The positioning sleeve 3 has a positioning cavity, and the positioning shaft 4 extends into the positioning cavity to form a telescopic sleeve connection structure of the positioning sleeve 3 and the positioning shaft 4; the positioning sleeve 3 is fixedly arranged on the lower surface of the top plate 1, and the positioning shaft 4 is fixedly arranged on the upper surface of the bottom plate 2. The positioning sleeve 3 is provided with a plurality of first positioning installation holes 8 along the telescopic direction of the telescopic assembly, and the positioning shaft 4 is provided with a second positioning installation hole 15 corresponding to the first positioning installation hole 8. The positioning sleeve 3 and the positioning shaft 4 are slidably matched, and the telescopic function is realized by the first positioning installation hole 8, the second positioning installation hole 15 and the locking screw, the locking bolt, etc., and the installation positioning and fixing are realized, so as to adjust the distance between the top plate 1 and the bottom plate 2.

[0035] Furthermore, two groups of the adjustment components are symmetrically arranged on the lower surface of the top plate 1. According to actual engineering requirements, the two groups of the adjustment components can both be equipped with excavation components; or one group of the adjustment components is equipped with an excavation component, and the other group is not equipped with an excavation component.

[0036] Specifically, both groups of adjustment components can be equipped with excavation components: Figure 1As shown, at this time, four groups of excavation components are set at the lower end of the top plate 1; two groups of excavation components are set on each group of the adjustment components, and the axis directions of the two groups of excavation components on the same side are parallel to each other; the end of the first connecting arm 5 away from the top plate 1 is fixedly connected to the excavator travel assembly 17 mounting tube 13, and the outer end of the excavator travel assembly 17 mounting tube 13 is connected to the excavation component through the excavator travel assembly 17. By adjusting the telescopic component, the wheel spacing between the excavation components on the two groups of adjustment components can be adjusted at the same time, and the milling range of the square pile drill bit can be adjusted according to the size of the square pile; the square pile drill bit at this time is used to mill standard square pile holes, such as Fig.11 shown.

[0037] Specifically, one group of adjustment components is equipped with an excavation component, and the other group is not equipped with an excavation component: Figure 6 As shown, at this time, it is equivalent to that only two groups of excavation components are set at the lower end of the top plate 1, and the two groups of excavation components are installed on the same adjustment component at the same time; only one group of the adjustment components is provided with two groups of excavation components, and the axial directions of the two excavation components are parallel to each other, and the end of the first connecting arm 5 away from the top plate 1 is fixedly connected to the excavator travel assembly 17 mounting tube 13, and the outer end of the excavator travel assembly 17 mounting tube 13 is connected to the excavation component through the excavator travel assembly 17; the wheelbase between the two excavation components can be adjusted by adjusting the telescopic component; because the excavation component is not set on the other adjustment component, the square pile drill bit at this time is used to mill "T"-shaped square pile holes. As shown Fig.12 As shown, when excavating a "T"-shaped square pile, the arc surface of the mounting cylinder 13 of the two excavator travel assemblies 17 without the excavation components installed is positioned and matched with the inner wall of the square pile hole to achieve positioning during milling, and prevent the square drill bit from swinging on the inner wall of the square pile when milling the "T"-shaped square pile, so that the "T"-shaped square pile after milling has a standard appearance and a smooth surface.

[0038] It should be noted that the above-mentioned "two sets of excavation components located on the same side" refer to two sets of excavation components connected to the same adjustment component, that is, the two sets of excavation components are defined to be located on the same side. The above-mentioned "outer end of the mounting tube 13 of the excavator travel assembly 17" refers to the end of the mounting tube 13 of the excavator travel assembly 17 facing the outside of the square pile drill bit, at which time the square pile drill bit can drill the four corners of the hole to be drilled, thereby drilling a square pile hole.

[0039] Furthermore, the mounting tube 13 of the excavator travel assembly 17 is a tube-type structure, and the outer end of the mounting tube 13 of the excavator travel assembly 17 is provided with a plurality of first connection screw holes 18, and the excavator travel assembly 17 is provided with a second connection screw hole corresponding to the first connection screw hole 18; the excavation assembly includes an excavation wheel body 12 and an excavation element 10, and a plurality of the excavation elements 10 are arranged on the excavation wheel body 12, and a connecting plate 22 is fixedly connected to the inner side wall of the excavation wheel body 12, and a third connection screw hole 23 is provided on the connecting plate 22, and a fourth connection screw hole corresponding to the third connection screw hole 23 is provided at the rotating end of the reducer of the excavator travel assembly 17, and the excavator travel assembly 17 drives the excavation wheel body 12 to rotate, thereby realizing milling. The hydraulic motor on the excavator travel assembly 17 is installed inside the mounting tube 13 of the excavator travel assembly 17, and plays a protective role.

[0040] The excavating element 10 is a finished bullet head, or other hard protrusions. Fig.10 As shown, an excavation cutting scraper 11 is also provided on the back of the excavation element 10. The excavation cutting scraper 11 can be disassembled and replaced relative to the excavation element 10 (bullet head). The distance between the cutting surface of the excavation cutting scraper 11 and the center of the excavation component is slightly smaller than the distance between the excavation point of the excavation element 10 and the center of the excavation component. The function of the excavation cutting scraper 11 is that after the excavation element 10 (bullet head) cuts the other pile wall, the excavation cutting scraper 11 performs secondary cutting on the other pile wall to achieve a higher cutting surface flatness. The excavation cutting scraper 11 can be a steel plate welded with cemented carbide, or other hard parts.

[0041] It should be noted that a group of the first connecting arms 5 may be one, two or more first connecting arms 5; a group of the second connecting arms 6 may be one, two or more second connecting arms 6. A preferred technical solution is that when a group of the first connecting arms 5 is one, a group of the second connecting arms 6 is one; when a group of the first connecting arms 5 is two, a group of the second connecting arms 6 is two; and so on, the number of each group of the first connecting arms 5 corresponds to the number of each group of the second connecting arms 6.

[0042] The preferred technical solution is that a group of the first connecting arms 5 includes two first connecting arms 5; two first connecting arms 5 are fixedly arranged on the circumferential side wall of the mounting cylinder 13 of the excavator walking assembly 17, and the two first connecting arms 5 are arranged opposite to each other and connected and fixed by a plurality of reinforcing plates 21; four rotating center seats 28 are arranged on the lower surface of the top plate 1, and two first connecting pin holes 29 are symmetrically arranged on each rotating center seat 28, and the two first connecting pin holes 29 are used to hinge a group of first connecting arms 5, and one end of the first connecting arm 5 is provided with a second connecting pin hole 20 corresponding to the first connecting pin hole 29. The hinge between the first connecting arm 5 and the rotating center seat 28 is realized by the first connecting pin hole 29, the second connecting pin hole 20 and the pin shaft.

[0043] Further, a group of the second connecting arms 6 includes two second connecting arms 6; two connecting seats 25 are symmetrically arranged on the upper surface of the bottom plate 2, two third connecting pin holes 26 are symmetrically arranged on the connecting seats 25, and a fourth connecting pin hole corresponding to the third connecting pin hole 26 is arranged on the second connecting arm 6; a fifth connecting pin hole is arranged on one end of the second connecting arm 6 away from the fourth connecting pin hole, and a sixth connecting pin hole 19 corresponding to the fifth connecting pin hole is arranged on the first connecting arm 5. The third connecting pin hole 26 and the fourth connecting pin hole cooperate with the pin shaft to realize the hinge connection between the second connecting arm 6 and the connecting seat 25. The fifth connecting pin hole and the sixth connecting pin hole 19 cooperate with the pin shaft to realize the hinge connection between the first connecting arm 5 and the second connecting arm 6.

[0044] Further, such as Figure 7 As shown, the top plate 1 is provided with a connecting square head 9 on the upper surface. The top plate 1 is the skeleton of the entire square drill bit. The connecting square head 9 on the top is connected to the connecting square head 9 of the rotary drilling rig to support and fix the entire square pile drill bit. The rotary drilling rig provides power for the excavator travel assembly 17. Top reinforcing ribs 7 are provided between the upper surface of the top plate 1 and the connecting square head 9 and around the top plate 1; bottom reinforcing ribs 16 are provided between the positioning sleeve 3 and the lower surface of the top plate 1. Bottom plate reinforcing ribs 24 are provided between the lower surface of the bottom plate 2 and the positioning shaft 4 and around the bottom plate 2.

[0045] Working principle of telescopic hydraulic square pile drill: The function of the square pile drill is that the wheelbase of the two excavating wheel bodies 12 on the same adjusting component can be adjusted. When the adjusting base plate 2 moves up and down, the base plate 2 drives the second connecting arm 6 hinged thereto to move, and the second connecting arm 6 drives the first connecting arm 5 to move. The first connecting arm 5 drives the excavator walking assembly 17 mounting cylinder 13 to rotate along the rotating center seat 28 fixed to the top plate 1. The excavator walking assembly 17 is installed inside the wall of the excavator walking assembly 17 mounting cylinder 13. The fixed end of the excavator walking assembly 17 is positioned and installed on the excavator walking assembly 17 mounting cylinder 13. The excavating component is fixedly installed on the rotating end of the excavator walking assembly 17. When the excavator walking assembly 17 mounting cylinder 13 swings along the rotation center, the rotation and swing of the excavating component is realized, thereby realizing the adjustment of the excavation range of the square pile drill, thereby realizing the excavation of square piles of different sizes.

[0046] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, and substitutions made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. Telescopic hydraulic square pile drill bit, characterized by: The invention comprises a top plate (1), a bottom plate (2), an adjustment component and an excavation component, wherein the top plate (1) and the bottom plate (2) are connected via a telescopic component; the adjustment component comprises a first connecting arm (5) and a second connecting arm (6); one end of two groups of the first connecting arms (5) are symmetrically hinged to the lower end of the top plate (1), and the other end of the first connecting arms (5) is provided with the excavation component; one end of two groups of the second connecting arms (6) are respectively hinged to the two groups of the first connecting arms (5), and the other end of the second connecting arms (6) are both hinged to the bottom plate (2); the telescopic component is telescopically extended and retracted up and down to adjust the distance between the top plate (1) and the bottom plate (2), so as to adjust the wheelbase between the two excavation components.

2. The telescopic hydraulic square pile drill bit according to claim 1, characterized in that: The telescopic assembly comprises a positioning sleeve (3) and a positioning shaft (4) which cooperate with each other. The positioning sleeve (3) is fixedly arranged at the lower end of the top plate (1), and the positioning shaft (4) is fixedly arranged at the upper end of the bottom plate (2). The positioning sleeve (3) is provided with a plurality of first positioning mounting holes (8) along the telescopic direction of the telescopic assembly, and the positioning shaft (4) is provided with second positioning mounting holes (15) corresponding to the first positioning mounting holes (8). The positioning sleeve (3) and the positioning shaft (4) cooperate with each other through the first positioning mounting holes (8) and the second positioning mounting holes (15) to realize the telescopic function.

3. The telescopic hydraulic square pile drill bit according to claim 2, characterized in that: Two groups of the adjustment components are symmetrically arranged at the lower end of the top plate (1); an end of the first connecting arm (5) away from the top plate (1) is fixedly connected to an excavator travel assembly mounting cylinder (13); each group of the adjustment components is provided with two groups of the excavation components, and the axis directions of the two groups of the excavation components are parallel to each other; the outer end of the excavator travel assembly mounting cylinder (13) is connected to the excavation component via the excavator travel assembly (17).

4. The telescopic hydraulic square pile drill bit according to claim 2, characterized in that: Two groups of the adjustment components are symmetrically arranged at the lower end of the top plate (1); an end of the first connecting arm (5) away from the top plate (1) is fixedly connected to an excavator travel assembly mounting cylinder (13); only one group of the adjustment components is provided with two groups of the excavation components, and the axial directions of the two excavation components are parallel to each other, and the outer ends of the excavator travel assembly mounting cylinders (13) are connected to the excavation components via the excavator travel assembly (17); when excavating a "T"-shaped square pile, the arc surfaces of the two excavator travel assembly mounting cylinders (13) without the excavation components installed are positioned and matched with the inner wall of the square pile hole.

5. The telescopic hydraulic square pile drill bit according to claim 3 or 4, characterized in that: The outer end of the excavator travel assembly mounting tube (13) is provided with a plurality of first connection screw holes (18), and the excavator travel assembly (17) is provided with second connection screw holes corresponding to the first connection screw holes (18); the excavating assembly comprises an excavating wheel body (12) and excavating elements (10), a plurality of the excavating elements (10) are arranged on the excavating wheel body (12), a connecting plate (22) is fixedly connected to the inner side wall of the excavating wheel body (12), and a third connection screw hole (23) is provided on the connecting plate (22), and a fourth connection screw hole corresponding to the third connection screw hole (23) is provided at the rotating end of the reducer of the excavator travel assembly (17).

6. The telescopic hydraulic square pile drill bit according to claim 3 or 4, characterized in that: A group of the first connecting arms (5) comprises one, two or more first connecting arms (5); a group of the second connecting arms (6) comprises one, two or more second connecting arms (6).

7. The telescopic hydraulic square pile drill bit according to claim 6, characterized in that: A group of the first connecting arms (5) comprises two first connecting arms (5); the two first connecting arms (5) are fixedly arranged on the circumferential side wall of the excavator travel assembly mounting cylinder (13), the two first connecting arms (5) are arranged opposite to each other and connected by a reinforcing plate (21); four rotating center seats (28) are arranged on the lower surface of the top plate (1), the rotating center seats (28) are symmetrically penetrated with first connecting pin holes (29), and one end of the first connecting arm (5) is provided with a second connecting pin hole (20) corresponding to the first connecting pin hole (29).

8. The telescopic hydraulic square pile drill bit according to claim 7, characterized in that: A group of the second connecting arms (6) comprises two second connecting arms (6); two connecting seats (25) are symmetrically arranged on the upper surface of the bottom plate (2); two third connecting pin holes (26) are symmetrically arranged through the connecting seats (25); a fourth connecting pin hole corresponding to the third connecting pin hole (26) is arranged on the second connecting arm (6); a fifth connecting pin hole is arranged at one end of the second connecting arm (6) away from the fourth connecting pin hole; and a sixth connecting pin hole (19) corresponding to the fifth connecting pin hole is arranged on the first connecting arm (5).

9. The telescopic hydraulic square pile drill bit according to claim 2, characterized in that: A connecting square head (9) is provided on the upper surface of the top plate (1), and top reinforcing ribs (7) are provided between the upper surface of the top plate (1) and the connecting square head (9) and around the top plate (1); bottom reinforcing ribs (16) are provided between the positioning sleeve (3) and the lower surface of the top plate (1).

10. The telescopic hydraulic square pile drill bit according to claim 2, characterized in that: Bottom plate reinforcing ribs (24) are provided between the lower surface of the bottom plate (2) and the positioning shaft (4) and around the bottom plate (2).

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